Silicon PU course materials are new types of basketball court materials that have been widely used in sports venues in recent years. The main components are polyurethane (PU) and silicone. The main features are safety, environmental protection, and good ductility. Among them, excellent weatherability adaptability is widely used in different climatic environments. The unique shock absorption and elasticity properties are of great significance in preventing sports injuries. Not only that, but also pay attention to professional skills and methods in the process, the following will give you talk about silicon pu construction process by silicon pu use precautions.
Silicon pu construction process
New cement concrete foundation
First, the basic treatment
1), grinding seam
Grind the bases on both sides of the temperature seam 40-50mm wide to 3mm deep, making the surface of the temperature seam “V†type. (The width of each 40-50 is to increase the bonding area between the sealant and the base surface and increase its The adhesive force, 3mm deep is the position of the sealant glue without occupying the elastic layer, ensuring the overall cushioning property, so that the thermal expansion and contraction of the base does not affect the surface of the silicon PU).
2) Pickling
Wet the foundation with clean water (prevent dilute hydrochloric acid from penetrating into the foundation), dilute and wash the base surface with dilute hydrochloric acid with a concentration of 8% left, and rinse with clean water (usually rinse twice). After washing and drying, ask for the color of the base cement. , No white powder and loose material. During the pickling process, the water level should be circled and marked.
3), caulking
Using a foam joint to fill the seams, the foam joints are stretchable and compressible, which can effectively reduce the impact of the basic thermal expansion and contraction on the appearance of the surface. The exposed filler foams are ground with a hand grinder. Use TB-002 to divide the "V" groove into two or more layers (the thickness of each groove is not more than 1.0mm. If it is too thick, it will foam and affect the tensile properties of TB-002). TB-002 is attached to a 50mm wide non-woven fabric over the surface in a state of semi-dry (dry surface). The non-woven fabric cannot be wider than the "V" groove or beyond the "V" groove. (Non-woven fabric exceeds the "V" groove range, and directly bonds with the foundation, which will cause the basic thermal expansion and contraction stress to act directly on the non-woven fabric, so that the entire caulking system loses the buffering effect)
4) Primer
After the foundation is dry enough, apply a special primer (TB-201) to the base surface. The principle is to transform the base surface into a wet color after brushing. Insufficient places should be coated (The effect of the primer is to penetrate the micro pores of the foundation. Inside, solidified base after curing). Basic surface strength
After TB-201T is painted, a diluted TB-002 (with 20% thinner) is rolled immediately. (It acts as a micro hole to close the surface of the base, preventing the air in the micro hole from producing small needles when trotting the TB-002. Holes; improve the adhesion to the base surface, to prevent the TB-201 rolling brush is too thick, completely cured surface is too smooth and reduce the bond strength.)
Second, silicon PU material construction
(elastic layer → stretched layer → surface → scribing)
1, elastic layer:
The elastic layer should be carefully inspected before construction to ensure that the elastic layer is applied after the foundation treatment. The elastic layer (TB-002) is a one-component water-absorbing curing material and is directly applied to the base surface with a tooth scraper. The thickness of each scratch cannot be Above 2.5mm, each coater shall be dry and solid (usually about 10 hours, depending on the weather conditions on site) until the desired thickness is applied. When the temperature is low and the consistency of the coating increases, an appropriate amount of thinner (xylene, ethyl acetate, 200# solvent oil) may be added to adjust the construction consistency. If the temperature is lower than 15°C and the relative humidity is low (<60%), it is necessary to add 3 ~ 5% water is mixed and then scraped to accelerate the solidification of the material and reduce the interval time. The specific amount of water added depends on the weather on site. Before using the diluent, you must do a small test (by TB-002: diluent = 10:3 to make a 1.5~2mm thick sample), and confirm that the diluted material can be used without any problems. Construction should be avoided under high temperature and in the sun. After construction, it should be kept for 2 to 3 hours without violent sunlight. Otherwise, surface blisters may be caused by surface forming too quickly. After the elastic layer is solidified, the surface flatness is tested by the stagnant water method, and the water is repaired and smoothed with TB-002. If there is any debris or accumulation on the surface, it must be trimmed with a grinding machine or other tools before the reinforcement layer can be constructed.
2, strengthen the layer:
Reinforcing layer (TB-003) is a one-component water-absorbing material. It is applied with 1-2 squeegee blades directly on the finished elastic layer. It must be ensured that the surface after the squeegeeing is smooth and smooth. Each squeegee interval is before A dry basis (usually about 10 hours, depending on the weather conditions on site) until scratched to the required thickness. If the temperature is lower (<12°C) and the relative humidity is lower (<60%), add 2~5% water and stir it evenly and then apply a scraper to accelerate the solidification of the material and reduce the interval time. The specific amount of water depends on the weather at the site. . If the temperature is lower and the consistency of the coating increases, an appropriate amount of thinner may be added to adjust the construction consistency. Construction should be avoided under high temperature and in the sun. After construction, it should be kept for 2 to 3 hours without violent sunlight. Otherwise, surface blisters may be caused by surface forming too quickly. In the construction process, if there is debris mixed or scraped with uneven areas, it must be smoothed before surface finishing.
3, surface layer:
The surface layer (TB-205) is a two-component waterborne material, and the two components must be thoroughly mixed evenly at a specified ratio (Group A: Group B = 100:7 (weight ratio)). (The mixing ratio will not affect the surface layer. The curing effect will directly affect the performance of the surface layer. Add water to dilute the construction consistency, generally adding 50 to 80% (TB-205 weight calculation, according to the actual situation on site), and use special spray guns to spray multiple layers on the reinforced layer. It needs to be coated with special sand for rough surface. The lowest temperature is lower than 5°C. It is not suitable for construction. After the construction, the water is soaked for 10 hours. All kinds of ball scene layer reference practices:
Aã€Basketball court: three sprays, plus 30% (TB-205 weight) of special sand for the first and second lanes. The amount of each TB-205 is about 0.12kg, and the third lane is no sand (the amount is about 0.06 Kg) When sand is added, stir the A component and the special sand evenly, then add the B component and stir it well, then add water to dilute it; add three sands in the three-second exclusion zone, and add no sand. ).
B. Tennis courts: Three sprays are used. The first one adds 50% sand, the second one adds 20% sand, and the third one does not add sand.
C. Badminton and volleyball courts: Three shots without sand.
4, marking
Measure according to the standard size, mark the position of the boundary line, and apply masking paper on both sides of the boundary. Apply special marking paint (TB—207) on the textured paper. After the surface is dry, tear off the textured paper. . TB-207 is a two-component material. It is necessary to mix the A and B components in a specified ratio (A:B=100:7) and apply them in two passes. If the surface of the court is a rough surface, the first channel can be coated with 20% of special surface sand to prevent seepage.
Silicon pu use matters needing attention
â— We must weigh accurately and stir evenly when mixing materials.
â— The surface must be kept clean before each procedure in the construction process.
â— Indoor ventilation must ensure good ventilation.
â— It must be kept for more than 5 days after the site is laid before it can be put into use.
â— It is forbidden to wear leather shoes, high heels or easy-to-color sports shoes.
â— Cutting and squeezing are strictly prohibited. The surface should not be rubbed with hard objects to avoid damage or cracking.
â— It is forbidden to use chemical agents such as acid and alkali on the floor and keep away from fire and high temperature to avoid deformation of the floor.
Summary: The relevant information on the silicon pu construction process and the precautions for using silicon pu is introduced here. I hope this article will be helpful to everyone. If you still have something you don't understand, you can leave a message to Xiaobian at the bottom. We will answer your questions as soon as possible.
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