This article describes the development and innovation of environmental protection composite insulation materials, pay attention to the application effect, combined with the superiority of the composite insulation material itself, and advocate the diversification of the new concept of the insulation layer structure.
Innovative composite thermal insulation materials; diversified thermal insulation structure; superior comprehensive performance Europe and the United States and other developed countries started earlier in the research and application of slurry thermal insulation materials, the technology is relatively mature, and has been effective in research and application. At present, developed countries in the slurry insulation materials research and development is based on lightweight multi-functional composite slurry insulation materials. The performance of these slurry insulation materials is significantly higher than that of conventional slurry insulation materials, such as low thermal conductivity, good use safety, and durability. At the same time, these composite slurry insulation materials have excellent functionalities, such as non-Freon flame-retardant polyurethane foam composite insulation materials, ultra-light full-scale hydrophobic calcium silicate slurry insulation materials, etc., to meet different conditions of use The request. In addition, foreign countries attach great importance to the environmental protection issues of the insulation material industry, and actively develop “green†insulation materials products, from the raw material preparation (mining or transportation), product production and use, and future disposal issues, all require maximum resources conservation and reduce the Environmental hazards. The insulation material industry is a very successful model for the recycling and reuse of foreign resources. It saves natural resources, reduces the pressure on the waste flowing environment, and consumes less energy in the production process. For example, the United States strongly encourages the extensive use of recyclable raw materials in the insulation material industry. The US Environmental Protection Agency (EPA) stipulates that if it is to obtain funding from a federal fund of more than US$10,000, the insulation materials used in construction projects will contain the minimum recycling components. Must meet the required standards.
China's thermal insulation materials are currently in a period of development. Although some gratifying progress has been made, the overall level of technology is backward. In particular, research and development of slurry thermal insulation materials are relatively backward. At present, a large number of slurry thermal insulation materials used in civil engineering in China are still based on conventional slurry-impregnated perlite insulation materials, which have high water absorption, poor crack resistance and weather resistance, and have great limitations in application. Many times of survival, construction efficiency is low, insulation mortar is prepared on site, and its quality is not easy to control and guarantee. In addition, as a developing big country, industry and agriculture are showing a new situation of vigorous development. Therefore, China, like other developing countries, is facing the problem of increasing environmental pollution. Therefore, how to use industrial waste to develop excellent insulation materials to achieve energy saving, resource conservation, and reduce environmental pollution is a hot topic in China's slurry insulation materials research. It is a research direction of insulation materials suitable for China's national conditions.
The specific research content includes the following aspects: It mainly uses waste EPS particles and is equipped with some high-quality expanded perlite as insulation aggregates. Starting from the size, gradation, porosity, and pore structure of the heat-insulating aggregate, the thermal conductivity of the material is minimized and the thermal insulation effect of the material is enhanced.
(Reasonably modify the EPS particles to overcome the poor hydrophilicity of EPS, ensure effective compounding with inorganic materials, and realize the reuse of waste EPS.
(3) Select other raw materials and determine the best mix ratio by using mathematical statistics theory and methods.
(4) In-depth analysis of the performance mechanism of the developed insulation material.
This project is based on Portland cement as the main cementitious material, with a proper amount of composite fiber, making full use of EPS with small water absorption, high toughness, and good crack resistance to develop a small thermal conductivity, convenient construction and safe use. The powder is scattered and the appropriate amount of water is stirred to form a paste-like heat-insulating material.
2 Research on the topic In this paper, from the viewpoint of building thermal insulation and energy conservation, a thermal insulation performance, relevant technical performance, convenient construction, and low cost have been developed for the northern China, especially in some hot summer and cold winter regions. , easy to promote and other advantages of energy-saving environmental protection slurry insulation materials. The successful development and promotion of this material will surely promote the smooth implementation of the wall reform and the development of building energy conservation in a large number of regions.
In recent years, due to the rapid development of industry, the production and use of polystyrene has increased day by day. As a result, a large amount of waste polystyrene has become a “white trash†that has seriously affected the healthy development of the ecological environment. Insulation material is based on the waste EPS particles as the main raw material, turning waste into treasure, comprehensive utilization of resources, with positive environmental protection. At the same time, the slurry insulation material is in line with China's national conditions. It has important practical significance to research and develop high-performance, energy-saving and environment-friendly slurry insulation materials and promote the reform of wall materials to meet the requirements of building insulation and environmental protection.
3 The theoretical research basis of the building's heat transfer process 3.1 The building's heat transfer process The building's rooms are separated from the external environment by means of the enclosure structure, and create a certain heat and humidity environment and air conditions in the room through room heating and air conditioning. However, during the actual use of the building, its internal thermal system is affected by outdoor air humidity, temperature, solar radiation intensity, wind direction, wind speed, and ambient air temperature and humidity. These factors affect the hot and humid state of the room through heat exchange and air exchange. By heat exchange, it is meant that the ambient air temperature and solar radiation pass through the opaque panel wall enclosing structure and translucent doors, windows, and glass to heat exchange with the room, and solar radiation transmits radiant heat to the room through translucent glass, etc. . The slatwall envelope structure of a building mainly refers to: external walls, roofs and other enclosure structures, and the ground, interior walls, and other enclosure structures and external windows and external doors. External disturbances Through the heat transfer process of the siding envelope structure, whether it is conducted thermally or in the form of radiation, whether it is immediately affecting the interior or gradually affecting the interior, it is the first effect on the internal surface of the envelope to change its temperature. Then, heat exchange occurs with indoor air in the form of convection and the like, thereby affecting the indoor thermal environment.
Heat transfer in buildings is a spontaneous flow of heat from a high temperature zone to a low temperature zone. It is a phenomenon of energy transfer caused by a temperature difference. In nature, heat transfer occurs whenever there is a temperature difference, either inside or between two media.
Heat conduction depends on the thermal motion of microscopic particles such as molecules, atoms, and free electrons inside the object, and there is no relative displacement of heat transfer in all parts of the object.
It can occur in solids, liquids, and gases, but within the sphere of Earth's gravitational field, simple heat-conducting processes will only occur in dense solids. The heat conduction to the wall mainly occurs inside the material.
Thermal convection depends on the random motion of fluid molecules and the overall macroscopic motion of the fluid, transferring heat from one place to another. Occurs mainly in liquids and gases, but in porous solid insulation materials, convective heat transfer occurs in the gas in the pores. In heat transfer and adiabatic engineering, convective heat transfer must be done in contact with the solid walls, so there is a heat transfer phenomenon in contact with the solid walls.
When the fluid passes over the surface of the object, heat exchange occurs as long as there is a temperature difference between the two. Near the wall, due to the low velocity of the fluid, the heat transfer is mainly achieved through the random movement of the molecules, which can be regarded as the simultaneous process of heat conduction and convection. For the wall, thermal convection occurs mainly on the internal surface of the wall and indoor air heat exchange and convection heat exchange between the external surface of the wall and the outside.
Thermal radiation is the phenomenon of transmitting heat by electromagnetic waves emitted from the surface of an object. Any object, as long as its temperature is greater than the absolute temperature (K), will radiate energy to the outside, and do not need to directly contact and transmit the medium, when the radiating electromagnetic wave encounters other objects, some will be converted into heat. The radiation of the object increases with the increase of temperature. When there is a temperature difference between the two objects, the energy radiated from the high temperature object to the low temperature object is greater than the energy radiated from the low temperature object to the high temperature object due to the difference in the radiation force. The result is that the heat is from the high temperature. The object is passed to a cryogenic object.
For walls, thermal radiation and convection occur simultaneously.
From the perspective of building heat transfer, in addition to considering the role played by walls, the comfort of living must also be considered. There are two situations: The first is the insulation of the winter wall. In order to maintain the indoor temperature in winter, the indoor temperature must be greater than the outdoor temperature.
At this time, the heat dissipation of the wall is performed under the condition that the indoor temperature does not change with time, so the so-called “stability of heat transfer†has high requirements for the heat insulation of the wall material.
The second is the insulation of the summer wall. As the outdoor temperature changes with time, the wall temperature is also changed due to heat transfer acting on the wall, so it is called unstable heat transfer. In order to make the indoor temperature not rise, the thermal insulation of the wall material is required to be high.
3.2.1 Stabilization of Walls The internal surface of the heat transfer wall absorbs heat.
Since the temperature in the room is greater than the temperature in the outdoor, when indoor heat is transferred to the outside through the wall, the interior temperature, the temperature in the wall surface of the wall, the temperature of the wall itself, the temperature of the wall surface of the wall, and the temperature of the outside wall inevitably decrease in turn. When the internal surface of the wall transfers heat to the outside, equal heat must be obtained from the indoor air, otherwise the temperature of the internal surface of the wall may be unstable. In this process, there is convection heat exchange with indoor air, and there are radiative heat exchanges between the inner surface and the opposite surfaces of the indoor space. Qi = a (t "§ where: qi - heat transfer per unit area of ​​wall per unit time (W / § - internal surface temperature of the wall (X) ti - indoor air temperature (X) thermal conductivity of the wall material layer .
After the inner surface of the wall absorbs heat, it passes through the wall material to the outer surface of the wall. If the wall is composed of a single material, the thermal conductivity of the wall material is A thickness d, and the temperature on both sides is § and §, and §>§ According to the formula for heat conduction, it can be known that: qi - the amount of heat transfer per unit wall area per unit of time (W/order: free from surface temperature (T) of the inside of a wall, divided by the amount of heat transfer through the wall The thickness of the layer is closely related to the thermal conductivity of the material layer, and the thermal conductivity of the material must be reduced in order to reduce the thermal conductivity of the wall.
(3 wall heat dissipation
Because the external wall surface temperature § is higher than the outdoor air temperature te, ie, §>te, the exterior surface of the wall dissipates heat to the outdoor air and the environment. The heat dissipation of the outer surface is a combination of convective heat transfer and radiation heat transfer, but due to the change in heat transfer conditions, the heat transfer coefficient also changes. The amount of heat dissipation is: Among them, qe- per unit area per unit area of ​​the external surface of the wall radiates heat te - outdoor air temperature (X (4 wall heat transfer coefficient.
In the steady state, the above two types of heat transfer are equal, rewritten as follows: three types add, eliminate e, e, get the heat transfer heat flux of the wall: q = on the + i + is called K for the wall The coefficient is called R for the thermal resistance of the wall.
In short, the greater the heat transfer resistance R of the wall, the less heat is transmitted through the wall. The heat transfer resistance and heat transfer coefficient of the wall are inversely related to each other, so the heat transfer coefficient and heat transfer resistance are important thermal indicators to measure the heat transfer of the wall.
3.2.2 Unstable wall heat transfer When buildings are used under natural conditions, the actual climatic factors are nearly cyclical, such as changes in spring, summer, autumn and winter, alternations of day and night, and fixed periods of time. And so on, can all be considered as periodic thermal effects. In the periodic heat effect, the simplest and most basic is the simple harmonic heat effect, that is, the temperature changes with time as a sine function or a cosine function. Under the simple harmonic heat effect, the distribution of the temperature inside the material and the wall, the degree of attenuation of the amplitude of the temperature wave, and the delay of the phase have a direct relationship with the selected material, structure and boundary conditions. The heat storage coefficient is a major indicator, and the building materials have the ability to store heat and release heat under the periodic fluctuation of heat, so as to adjust the fluctuation of the surface temperature of the material layer. In actual engineering practice, the thickness of the wall is limited. In this case, when the material layer is subjected to the harmonic temperature wave, the fluctuation of its surface temperature is closely related to the thermal physical properties of the constituent materials of the various structural layers. From this, it can be seen that the prevention of heat transfer by the wall largely depends on the insulation of the wall material.
The thermal insulation of the material is the transmission of the maximum resistance heat. Therefore, it is required that the heat-insulating material must have a small thermal conductivity, a heat transfer coefficient and a radiation heat exchange coefficient, or a heat-insulating layer composed of a heat-insulating material has a high thermal resistance value.
From the above analysis, it can be seen that the thermal conductivity of a material is mainly affected by the following factors: the composition and structure of the material.
Organic polymer materials have lower thermal conductivity than inorganic materials. In inorganic materials, the thermal conductivity of non-metals is smaller than that of metal materials; the thermal conductivity of gaseous materials is smaller than that of liquid materials, and the thermal conductivity of liquid materials is smaller than that of solids.
Apparent density.
The apparent density refers to the mass of a unit volume in the natural state of the material. Its volume includes both the volume of the solid portion and the volume of the pores. At low temperatures, the closed gas in the small pores can be considered as a "quiet" gas without convection, with only heat conduction and no convective heat transfer. Since the thermal conductivity of the static air is smaller than the thermal conductivity of the solid, the thermal conductivity becomes smaller as the porosity increases or the apparent density decreases. For porous materials, assuming that the thermal conductivity of the solid part is, the thermal conductivity of the gas part is, and the porosity is p, the overall thermal conductivity is generally between min and ax.
From the above, it can be seen that the thermal conductivity of the material is not infinitely reduced as the apparent density decreases. When the apparent density is less than a certain critical value, due to the high porosity, the air in the voids begins to produce convection. At the same time, the impedance of the gas to heat radiation is extremely low. If the porosity is too high, the radiative heat transfer will be strengthened accordingly. 1 Relationship between material density and thermal conductivity For porous thermal insulation materials, the lowest thermal insulation performance is only achieved when the thermal conductivity coefficient of the material is the sum of the convective heat transfer coefficient w and the radiation heat transfer coefficient a. The apparent density of the material at this time is called the optimal density.
(3 pore size and characteristics.
With the same apparent density, the smaller the pore size, the smaller the thermal conductivity. When the pore size is small to a certain size, the air is completely adsorbed by the pore walls, the pores are close to the vacuum state, and the thermal conductivity is minimized. When the pore volume is large to a certain extent, convection occurs in the air inside the pores, and the thermal conductivity becomes large. For the same porosity and pore size, the thermal conductivity is larger when the pores are in communication with each other, and the thermal conductivity is smaller when the pores are sealed with each other.
(4) Humidity.
The thermal conductivity of water is much larger than that of still air. Therefore, after the pores of the material absorb water or the equilibrium moisture content of the material increases, the thermal conductivity increases accordingly.
(5 heat flow direction.
If the material is anisotropic, the thermal conductivity in different directions is also different, and even different. Therefore, in order to reduce the thermal conductivity of the material, it is necessary to minimize the influence of the heat flow directionality.
Due to the effect of radiation heat transfer, the thermal conductivity of porous materials generally increases with increasing temperature. The relationship between the two is as follows: However, for the radiative heat transfer of porous solid materials, the thermal resistance can be increased by increasing the number of pore walls. This is consistent with the small pore volume that helps prevent convective heat transfer. Therefore, the greater the porosity of the material, especially the smaller the volume and the more closed pores, the better the reduction of the thermal conductivity of the material.
Through the above analysis of the factors affecting the thermal conductivity of the material, we can know that the improvement of the thermal insulation performance of the material can be achieved through the following ways: (1) Minimize the apparent density of the material so that the apparent density meets the optimal adiabatic density.
(2 try to use organic polymer materials and amorphous inorganic materials.
When the apparent density of the material reaches the optimal adiabatic density as much as possible, the number of pores inside the material should be increased as much as possible. The pores are small and in a closed state. The adsorption of gas molecules in the pores can be achieved through pore walls, and the pores can be free. The number of gas molecules that move is as small as possible.
(4) When using fibers in materials, the diameter of the fibers should be minimized to avoid adverse effects in the direction of heat flow.
3.4 Characteristics of Environmentally-Friendly Composite Insulation Materials 3.4.1 Intensity of Insulation Materials The issue of the inconsistency between the strength and light weight of insulation materials is the key to be solved and is also one of the difficulties in the study. The ideas adopted in this topic are as follows: (1) The aggregates in the insulation materials are all made of lightweight materials with large porosity, such as EPS particles and expanded perlite. Therefore, the strength of the aggregate itself is very small, and basically it does not achieve the "skeleton" effect. For this reason, the strength of the insulation material mainly comes from inorganic gelling materials. The hydration reaction produces a hydration product that forms a network of crystals and gels, fills voids between the aggregates, and bonds the insulating aggregate and other materials together to form strength.
(3 However, there is an affinity problem between inorganic gelling materials and thermal insulation aggregates. Due to the hydrophobic nature of some aggregate surfaces, the two materials are mutually exclusive. Therefore, the surface modification of the thermal insulation aggregates is required to ensure the aggregates and adhesives. The bonding strength of the condensate material fully exerts its elastic reinforcement effect, and provides sufficient tensile and flexural strength for the heat-insulating material, so as to ensure that the material has sufficient resistance against external force during use.
3.4.2 Anti-cracking Performance of Environmentally-Friendly Composite Insulation Materials Although inorganic cementitious materials provide a source of strength, they inherently have a relatively large shrinkage. Therefore, it is necessary to add a component that suppresses shrinkage in the material. The high-strength specialty microfibers made of polypropylene as the main material, reinforced with additives and modified processes, can play a significant role in suppressing shrinkage and preventing cracking in heat-insulating materials. The modification of the surface of the super wire significantly increases its binding force with the base material. Moreover, the incorporation of superfibers enables the internal cracks of the material to be immediately blocked when they come into contact with the adjacent microfibers, thereby preventing the expansion of cracks and improving the fracture toughness of the insulating material, thereby increasing the tensile strength and plastic shrinkage of the insulating material. , temperature stress, dry shrinkage and other factors caused crack crack resistance. At the same time, it can improve the freeze-thaw resistance of insulation materials and prolong the service life of insulation materials.
However, in practice, fibers often fail to exert their resistance to cracking and shrinkage due to dispersion problems. Therefore, the dispersion of fibers and the uniform mixing of cementitious materials and heat-insulating aggregates are the most difficult problems in this subject.
The thermal insulation thermal conductivity of environmental composite insulation materials is an important indicator to assess the merits of insulation materials. At present, most of the thermal conductivity of slurry insulation materials is high, or simply the pursuit of thermal conductivity to affect its strength. Theoretically speaking, the area of ​​multi-stress pores decreases, the strength decreases, or the proportion of lightweight aggregates affects the strength of cementitious materials, which reduces the overall strength. In short, under the necessary strength, the thermal conductivity can be reduced to the minimum, which is the third difficulty of this topic.
3.4.4 Construction of environmental protection composite thermal insulation materials The traditional cement-expanded perlite thermal insulation mortar has a high water absorption rate. It requires several times of survival during construction, and the construction efficiency is low. The thermal insulation mortar is prepared on site and its quality is difficult to control and guarantee. Environmentally-friendly composite thermal insulation materials must overcome the problems of large water absorbability and poor workability of traditional thermal insulation mortars, have good thixotropic properties, are easy to apply, labor-saving, easy to operate, and have good construction workability and reduce the number of construction survival. At the same time, the requirements for construction technology and construction tools are relatively low, which can significantly increase the construction efficiency, and break through the defects that the traditional insulation mortar site preparation quality is not easy to control.
3.4.5 Environmental protection The rational use of environmental protection resources for composite thermal insulation materials includes two aspects: it is necessary to give full play to the available value of the materials, and also to pay attention to the energy saving and environmental protection effects of material development. The use of waste polystyrene pellets as the main thermal insulation aggregate to recycle it will not only be conducive to the sustainable use of resources, but also be beneficial to the management of “white garbage†to purify the ecological environment. At the same time, there is no waste gas, waste residue, and waste liquid in the production process of this material. The production process is simple, and the noise is small and will not affect the health of workers. The components used in the material must be considered non-irritating and radioactive and safe and harmless during production, construction and use. This is also a necessary condition for the development of new insulation materials.
3.4.6 Expected Performance Indicators Expected performance indicators are shown in Table 1. Table 1 Expected Performance Indicators No. Item Measured Value Thermal Conductivity/Wm*K) Bond Strength/kPa 59 Compressive Strength/MPa Flexural Strength/ MPa product bulk density/kg*m3 dry bulk weight/kg*m-3 dry shrinkage/% water repellency/% 98 frost resistance (15 freeze-thaw cycles) mass loss %; strength reduction “10%; appearance no Obvious changes in flame retardancy Level 4 Green Evaluation of Environmentally Friendly Composite Insulation Materials 4.1 Brief Description As people’s environmental awareness continues to increase, people’s desire to use green products is growing stronger. At present, in the global production and consumption fields, there has been a rapid development of green waves. According to experts' estimation, green products may become the leading product in the world's major commodity markets in the next decade. The current authoritative point of view is that green products refer to the requirements for users to meet their functions and performance requirements economically through the use of advanced technologies during their life cycle, while achieving the goal of saving resources and energy, reducing or eliminating environmental pollution, and (producers and users) have well-protected products.
From the definition of green products, we can see that green products consist of three basic elements, namely: (1) The technological advancement of products, and technological advancement is the premise of green product design and production. Green products emphasize the adoption of advanced technology in their life cycle, technically ensure the safe, reliable and economical implementation of the product's various functions and performance, and ensure that the entire life cycle of the product has good green characteristics.
(2 product greenness, the green characteristics of the product include four aspects of energy saving, consumption reduction, environmental protection and labor insurance. It is achieved by adopting various green measures in various stages of the product life cycle and implementing strict management.
(3) The economic and economical nature of a product is one of the indispensable factors for a green product. If a product does not have a price acceptable to the user, it cannot go to the market. From the perspective of the life cycle, product cost should include Corporate costs, user costs, and social costs are the so-called life-cycle costs.
In short, true green products can only be obtained if the technological advancement, greenness, and economy are integrated into a whole product life cycle.
4.2 Technological advancement of environmental protection composite thermal insulation materials Special environmental protection composite insulation materials use a special EPS particle modification process, so that the waste EPS can be used in a large amount, and the properties of the materials used through the scientific use of admixtures and reinforcing fibers are all To reach the current domestic advanced level of similar products. Traditional slurry insulation materials have high water absorption, crack resistance and poor weatherability. They have great limitations in application. They require many times of survival during construction, and the construction rate is low, and many of them are prepared on-site, and their quality is difficult to control. And guarantee. Environmentally-friendly composite heat-insulating materials make full use of EPS chemical corrosion-resistance, non-absorbent, high toughness, and good crack resistance, and adopt special technical processes to achieve effective compounding with inorganic cementitious materials. It is a kind of small thermal conductivity and construction. Convenient and safe to use powdered bulk spread insulation. Its thermal insulation and construction workability can reduce the number of construction survival and improve construction efficiency. The crack resistance and weather resistance have been significantly improved. They have been applied to external insulation and have broken through the in-situ preparation of traditional thermal insulation mortars, and the quality is not easy to control. The environmental protection composite slurry insulation material is smear-type insulation material, which can form a whole body with the substrate, there is no cavity similar to the formation between the plate and the wall; at the same time, relying on the high adhesion of the material itself, it can completely solve the negative wind pressure insulation Destruction of layers. This material is based on inorganic materials and corrosion-resistant EPS, and has good aging resistance. When used, the outside of the insulation layer is supplemented with anti-cracking mortar and paste porcelain, paint, etc., to reduce the erosion and damage effects of the external environment on the insulation layer. Therefore, the product has long anti-aging service life and low maintenance costs.
4.3 Greenness The greenness of compound heat preservation materials refers to the comprehensive effect of the materials on the environment throughout the life cycle.
The energy-saving paste insulation material uses waste polystyrene particles as the heat-insulating aggregate, so that these resources are recycled and reused, and the “white waste†impact on the environment is reduced, and the environment is purified. The material's production process, equipment is simple, energy consumption is low, and the production is basically made on the spot, transport energy consumption is small. Non-renewable and depleted resources are rarely used in the production of materials.
The production of materials has the characteristics of simple process and low requirements on production conditions. There are basically no chemical reactions, no high temperature and no fuel, and no emissions of waste slag and waste gas. The production process is clean, and the raw materials do not contain harmful components to the human body, ensuring the safety of production personnel. The low production noise will not affect the health of the production staff and the normal life of the surrounding residents.
4.4 Economics of eco-friendly composite insulation materials The economics of materials include both the life cycle cost of materials and the life cycle benefits of materials. The material life cycle cost can be quantified using the LCCA (Life Cycle Costing Assessmen) method. LCCA can be defined as the sum of all internal funds and external capital costs associated with the product's entire life cycle.
4.5 Comprehensive Evaluation of Environmentally-Friendly Composite Insulation Materials The scientific and authoritative definition of green building materials is still in the process of identification. The concept of green building materials comes from eco-environmental materials. Its main features are firstly saving resources and energy; secondly, reducing environmental pollution, avoiding the greenhouse effect and the destruction of the ozone layer; the third is easy recycling and recycling. As an important branch of eco-environmental materials, according to its meaning, green building materials should be coordinated with the ecological environment during the production, use, abandonment, and regeneration cycle of materials, to meet the minimum resources and energy consumption, and the minimum or no environmental pollution. Good use performance, maximum recycling rate requires the design and production of building materials. Energy-saving and environment-friendly slurry insulation materials have the greatest degree of conservation of resources and energy during the production and use of their materials. There is no environmental pollution, and they are technologically advanced, green, and economically significant. Therefore, they belong to the category of green building materials. Its successful development adapted to the current society's requirements for construction products and made a greater contribution to the protection of the environment. With the continuous development and improvement of energy-saving and environment-friendly slurry insulation materials, it will surely play a role in promoting the development of environmental materials.
4.6 Construction process of environmental protection composite thermal insulation material This material is a slurry type thermal insulation material and has a definite construction process flow to ensure the safety of use. Since the outer wall of the exterior wall usually has two kinds of paints and tiles, the construction system of the insulation material is slightly different. See the construction process.
Insulation construction process flow diagram 5 Conclusion Through several years of example projects, nearly 30,000 m2 applications, thermal insulation can achieve the theoretical design requirements. At present, insulation materials on the market, whether organic insulation materials or inorganic insulation materials, have their own defects and continue to be innovative and perfect. Even the best insulation materials must be combined with the standard construction process and the professional construction team to match and combine. Well-designed, meticulous construction, can show difference. Thus, we can truly meet the requirements of the national standards for building energy efficiency. To achieve safety, health, green, and environmental protection. â–²
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