With the retreat of European and American home appliances, China has gradually become a global home appliance manufacturing center. Therefore, the demand for plastic materials is also increasing. Plastics has become the second-class raw material in the home appliance industry after steel, and the fastest growing application. At present, among the major home appliances in China, whether it is small appliances or household appliances, the appearance of plastics is indispensable. So today we will take a look at which plastics are used in the appliance housing? Most of the plastics used in the manufacture of home appliance casings are thermoplastics, accounting for about 90%. After collection, there are the following:
HIPS impact resistant polystyrene
ABS acrylonitrile-butadiene-styrene copolymer
PC polycarbonate
PPO polyphenylene ether
MPPO (modified polyphenylene ether) = PPO + HIPS
PVC PVC
A look at the characteristics of plastics for home appliances
General plastics are mainly: ABS, HIPS, GPPS, PP, etc.;
High surface requirements: color, finish, gloss, hardness, printing performance, etc.;
Good mechanical properties, thermal properties, aging resistance;
Flame retardant properties, electrical insulation properties;
Good processing performance and dimensional stability;
cheap price.
Second common plastics commonly used in household appliances
1.ABS, HIPS
It has good strength and toughness, high surface gloss, abrasion resistance and excellent comprehensive performance. It is the most used plastics in household appliances. China's household electrical appliance industry ABS / HIPS annual consumption of more than 1 million tons, is the largest variety of household appliances used in plastics; for televisions, radios, tape recorders, fans, vacuum cleaners and other appliances, refrigerators, drawers and so on. At present, the commonly used ABS suppliers in China are: Chi Mei, Kumho, Daqing, and Jihua; and HIPS, Yangba, BASF, Zhenjiang, and other.
2.PP
HIPS and ABS are the first plastic materials used in household appliances. Due to the high price of HIPS and ABS resins, foreign countries have gradually developed PP (polypropylene) modified materials suitable for household appliances parts, and at low cost. The advantages of light weight and good performance partially replace the application of HIPS and ABS resin in household appliances.
As one of the five general-purpose plastic materials, PP has excellent comprehensive properties, good chemical stability, good molding processability and relatively low price; but it also has low strength, modulus, low hardness and low temperature impact resistance. , the molding shrinkage rate is large, easy to aging and other shortcomings. Therefore, it must be modified to adapt to the needs of the product. The modification of PP materials is generally through the addition of minerals to enhance toughening, weathering modification, glass fiber reinforcement, flame retardant modification, super toughness modification, etc. Each modified PP has in the field of household appliances. A lot of applications. It has good strength and toughness, heat resistance, fatigue resistance, variety, low price and easy modification. It is the plastics used in household appliances only after ABS.
Used for inner and outer barrels and bases of washing machines. Cover plate, switch box, fan motor cover, refrigerator rear cover, motor cover and a small number of fans, TV casing, refrigerator door lining, drawers, etc. At present, the commonly used high-flow PP in China, for example: Yanhua K7726, Yanhua K9020, Shanghua Petrochemical M2600R, Hyundai M1600, Axon AP03B, etc.; and medium mobility is common: Singapore AW564, Saudi Arabia PP520, Exxon AP3N, etc. .
The current main directions of PP materials are:
1) High rigidity, high gloss PP
This product will likely replace PS and ABS in certain appliances, especially small appliances.
2) Halogen free flame retardant PP
The implementation of the EU RoHS Directive, the importance of environmental protection in all countries, the development of halogen-free flame retardant PP is urgent, and the market prospect is broad.
3) Long glass fiber reinforced PP
Ordinary short glass fiber reinforced PP, because it contains short glass fiber, easy to warp, low impact strength, easy to deform by heat, long glass fiber can overcome the above defects of short glass fiber, and the product has good surface and high use. Temperature and high impact strength can be applied to refrigerators and kitchen appliances with high heat resistance.
4) Antibacterial PP
This kind of plastic is a new type of functional polymer material with its own sterilization and antibacterial properties. It can be applied to the inner casing of washing machine and plastic parts in refrigerators.
3.PS and SAN
Good transparency, good rigidity, large surface hardness, stable size, good strength and toughness, good surface decoration and low price. It is the most widely used transparent plastic in household appliances; used in refrigerator fruit and vegetable boxes, egg racks and trays. , transparent parts such as tape cassettes.
4.PVC
Rigid PVC is a material with good flame retardancy, chemical resistance, UV resistance and cost advantages. It has been proven in the demanding North American appliance market and has successfully replaced other polymers. Materials such as flame retardant ABS, PC+ABS, PC.
In fact, rigid PVC is an innovative design that continues to drive the housing of home appliances, such as metal exteriors, IML in-mold decorative box glass packaging. This kind of source is rich, the price is low, the applicability is strong, and the adaptability is wide, but it is currently used in household appliances. The domestic is mainly used for refrigerator door seals and various household appliance sealing sleeves; foreign countries are used to replace some PP, ABS and HIPS. The injection molding and the ABS alloy are used to prepare the appliance housing.
5.PC
The best toughness of engineering plastics, good creep resistance, good heat and cold resistance, long-term use temperature of -60 ~ 120 ° C, anti-aging, good transparency. It is used for hair dryer, electric heater casing, gear, transparent cover, optical disc, washing machine side cover, hot water contact parts and other transparent parts such as refrigerator fruit and vegetable boxes, egg racks and trays.
6. Other
Magnetic plastics: including structural magnetic plastics (such as PPH "polybis-2,6-pyridyl octonitrile" iron sulphate in Japan) and composite magnetic plastics (magnetic powder and plastic mixture) for motors, electrical parts, Refrigerator seals, etc.;
Electromagnetic shielding plastics: including structural shielding plastics (such as polyacetylene) and composite shielding plastics, volume resistance of 10-2 ~ 10-11 Ω.cm, for electrical housing and circuit components.
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