Mineral filling modification is the most widely used modification approach. Add minerals such as calcium carbonate, talc powder, wollastonite, glass microspheres, and mica powder to the PP raw material. These minerals can not only improve the mechanical properties and impact toughness of PP materials to a certain extent, reduce the molding shrinkage of PP materials to strengthen their dimensional stability, but also significantly reduce the cost of PP materials due to the huge cost difference between minerals and PP matrix.
At present, the application areas of mineral filled modified PP in household appliances mainly include: the inner barrels, wheels, and clothes collection ports of wave wheel washing machines and drum washing machines; The sealing strip, speaker horn mouth, and speaker bracket of the microwave oven; Shelves for refrigerators; The shell and base of an electric rice cooker.
Many components of the microwave oven 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 speaker, the speaker bracket, etc. Due to the addition of minerals, the heat resistance temperature of PP material can be further improved on the basis of its high heat resistance temperature, in order to meet the requirements of microwave ovens for high temperatures.