New application trend of the hottest modified PP p

2022-07-31
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New trend of application of modified PP plastics in the field of household appliances hips and ABS are the first plastic materials used in household appliances. Due to the high price of hips and ABS resins, overseas countries have gradually developed PP (polypropylene) modified materials suitable for household appliance parts, and partially replaced hips and ABS resins in household appliance products with their advantages of low cost, light weight and good performance

pp, as one of the four general plastic materials, has excellent comprehensive properties, good chemical stability, good molding performance and relatively low price; However, it also has some disadvantages, such as low strength, modulus, hardness, poor low-temperature impact strength, large molding shrinkage, easy aging and so on. Therefore, it must be modified to meet the needs of products. The modification of PP materials is generally through the addition of minerals to strengthen and toughen, weather resistance modification, glass fiber reinforcement, flame retardant modification and super tough modification. Each modified PP has a large number of applications in the field of household appliances

mineral filling modification pp

mineral filling modification is the most widely studied modification method adopted today. Add calcium carbonate, talc powder, wollastonite, glass beads, mica powder and other minerals to PP raw materials. These minerals can not only improve the mechanical properties and impact toughness of PP materials to a certain extent, reduce the forming shrinkage of PP materials to enhance their dimensional stability, but also greatly reduce the cost of PP materials due to the huge cost difference between minerals and PP matrix

at present, the application parts of mineral filled modified PP in household appliances mainly include: the inner barrel, the impeller and the clothes taking port of the wave wheel washing machine and the drum washing machine; Sealing strip of microwave oven, loudspeaker bell mouth and loudspeaker support; Shelf of refrigerator; Shell and base of electric rice cooker, etc

micro will also give the extruder industry endless development power. Many parts of the wave furnace are also made of mineral reinforced and toughened PP materials. For example, the sealing strip of the microwave oven door body, the horn mouth of the microwave oven loudspeaker, the horn support, etc. Due to the addition of minerals, the heat-resistant temperature of PP material can be further improved on the basis of its high heat-resistant temperature, so as to meet the requirements of microwave oven for high temperature

in recent years, the price of raw materials has soared sharply. Under the pressure of cost, many injection molding manufacturers are considering replacing ABS with polystyrene or replacing polystyrene with modified PP products to reduce the cost. Therefore, a large number of PP materials can adjust the foaming reaction temperature to 150~200 ℃ by foaming additives (ZnO, urea, etc.). For example, when mineral reinforced and toughened PP materials are selected to replace the original polystyrene materials for injection molding refrigerator drawers, the cost per ton of raw materials can be saved by 1500~2000 yuan. Due to the large consumption, Haier group alone will consume about 1000 tons of this PP modified material a year. In addition, many refrigerator enterprises also use mineral reinforced and toughened PP materials for their refrigerator panels, such as Kelon Electric Appliance, Meiling electric appliance, etc. Although the mechanical properties of PP modified material are slightly worse than that of polystyrene, and there are problems such as distortion, shrinkage marks and poor rigidity. Taking advantage of the good toughness and high MFR of PP material, the product is redesigned, and a solid stiffener is added at the junction of the side and top surface of the product. This design basically solves the problem of poor rigidity of the product, which can save a lot of material costs

PP modified materials used for plastic parts on rice cookers are mainly divided into high gloss and heat-resistant materials. The shell of rice cookers requires high gloss, while the base requires high heat-resistant materials

in the past, the shell of rice cookers was mainly made of ABS. Due to cost pressure, now modified PP is mainly used to replace ABS. The shell material of rice cooker shall have high gloss and low shrinkage. The shrinkage can be improved by mineral filling. However, in the selection of minerals, glass beads, barium sulfate, calcium carbonate, etc. that have little impact on the surface gloss should be selected. If necessary, the surface gloss can also be improved by nucleating agent, lubricant, fluorescent agent, etc

weather resistant modified pp

because PP contains unstable tertiary carbon groups, it is prone to aging and degradation after the action of light, heat and oxygen, resulting in discoloration and strength decline, which limits its application in outdoor products. Therefore, the weatherproof modification of PP can greatly improve the service life of PP under outdoor adverse weather conditions. The modified material is mainly used for manufacturing household appliances that are used in the open air all the year round, especially for manufacturing the outdoor host shell of air conditioners to replace the traditional metal spray plastic shell

the outdoor unit shell of the air conditioner shall withstand the test of different climatic conditions such as sunshine, rain and severe cold, and shall meet the requirements for long-term use. The technology of using plastics to replace metal spraying was first developed and put into use by Sumitomo and Mitsubishi Chemical Co., Ltd. in the early 1990s. This technology overcomes the shortcomings of the original metal spraying shell, such as complex manufacturing process, high cost, large weight, easy to rust (which can affect the performance and service life of the whole machine), and finally reduces the labor intensity of workers, reduces energy consumption, and extends the service life. In addition to the outdoor unit shell of the air conditioner, weatherproof PP is also used for the axial fan blades of the outdoor unit of the air conditioner and the air outlet of the heater. In recent years, with the increase of the output of air conditioners, the application of modified weather resistant PP in the product market has gradually increased

flame retardant modified pp

in order to avoid fire, many countries now require that the materials used for electronic and electrical components in household appliances must be flame retardant. Among flame retardant PP, 63% are required to reach UL94V-0, 23% are required to reach UL94V-2, 12% are din4102b1 and 1% are other flame retardant grades. The high crystallinity and flammability of PP make it difficult to reach the high flame retardant level required by electrical and other industries, and the cost increases a lot. However, with the improvement of the society's requirements for the flame retardant of plastic products, the proportion of flame retardant PP will increase. At present, the annual growth rate of flame retardant PP is 8%

as PP is a flammable material, br/sb composite flame retardant is generally used in the market to modify its flame retardancy. Through flame retardant modification, PP products can reach UL94V-0 level, and can withstand 650 ℃ or even 750 ℃ hot wire without ignition. This flame retardant modified PP material is generally used to make components with potential Combustion Hazards in recent two years, such as TV shell, washing machine control panel base, wire controller shell, refrigerator evaporating dish, ventilation duct, etc

glass fiber reinforced modified pp

generally, the tensile strength of PP material is between 20m~30mpa, the bending strength is between 25m~50mpa, and the bending modulus is between 800m~1500mpa. If you want to use PP in engineering structural members, you must use glass fiber for reinforcement

generally speaking, the mechanical properties of PP products reinforced by glass fiber can be doubled or even several times improved. Specifically, the tensile strength reaches 65mpa~90mpa, the bending strength reaches 70mpa~120mpa, and the bending modulus reaches 3000mpa~4500mpa. Such mechanical strength is comparable to ABS and reinforced ABS products, and it is more heat-resistant. Generally, the heat resistance temperature of ABS and reinforced ABS is between 80 ℃ ~98 ℃, while the heat resistance temperature of glass fiber reinforced PP can reach 135 ℃ ~145 ℃. It can be used to make axial flow fans and cross flow fans in refrigerators, air conditioners and other refrigeration machines, and its cost is much lower than that of ABS enhanced products

in addition, it can also be used to manufacture the inner barrel, wave wheel and belt pulley of high-speed washing machines to meet their high requirements for mechanical performance. It can also be used in places with high requirements for temperature resistance, such as rice cooker bases, handles and electronic microwave ovens

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