Method for foaming polypropylene plastic through low-temperature thermal expansion microspheres
A technology for foaming polypropylene and expanding microspheres is applied in the field of low-temperature thermally expanding microsphere foaming polypropylene plastics, which can solve the problems of bubble merger, bubble wall rupture, gas escape, etc., so as to reduce bubble wall rupture, improve production efficiency, Good effect of shock resistance and energy absorption
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Embodiment 1
[0032] A method for foaming polypropylene plastics by low-temperature thermal expansion microspheres, the specific process of preparing foamed polypropylene is as follows:
[0033]With 0.8kg of bis(2-ethylhexyl) phthalate as plasticizer, 1.5kg of coal tar pitch as liquid softener, and 2kg of low-temperature thermally expandable microspheres with an initial foaming temperature not exceeding 120°C (polyethylene Methyl methacrylate as the shell and sodium bicarbonate as the core), added to 10kg of polypropylene powder with a particle size of 20-40μm, added to a high-shear emulsifier, adjusted the rotor speed to 2500r / min, and turned on the drive The motor makes the material evenly mixed to make a viscous system. At the same time, under the action of strong shearing and stirring, air is involved in the system to form a preliminary foam; the resulting preliminary foam is placed in a mold, heated by high-temperature saturated steam at 130°C, and the steam is controlled. The pressur...
Embodiment 2
[0036] A method for foaming polypropylene plastics by low-temperature thermal expansion microspheres, the specific process of preparing foamed polypropylene is as follows:
[0037] Use 1kg of dioctyl phthalate as plasticizer, 1kg of pine tar as liquid softener, and 2.5kg of low-temperature thermally expandable microspheres with initial foaming temperature not exceeding 120°C (polymethyl methacrylate as shell, sodium bicarbonate as the core), add to 10kg polypropylene powder with a particle size of 20~40μm, add it to a high-shear emulsifier, adjust the rotor speed to 2200r / min, turn on the drive motor, and mix the materials evenly , made into a viscous system. At the same time, under the action of strong shearing and stirring, air is involved in the system to form a preliminary foam; the resulting preliminary foam is placed in a mold, heated by high-temperature saturated steam at 140°C, and the steam is controlled. The pressure is 0.3MPa, the expansion microsphere inside is he...
Embodiment 3
[0040] A method for foaming polypropylene plastics by low-temperature thermal expansion microspheres, the specific process of preparing foamed polypropylene is as follows:
[0041] Use 0.9kg of bis(2-ethylhexyl) phthalate as plasticizer, 1.2kg of coal tar as liquid softener, and 2.2kg of low-temperature thermally expandable microspheres with an initial foaming temperature not exceeding 120°C (with Polymethyl methacrylate as the shell and sodium bicarbonate as the core), add it to 10Xkg polypropylene powder with a particle size of 20-40 μm, add it to a high-shear emulsifier, adjust the rotor speed to 2000r / min, and turn on Drive the motor to make the materials mix evenly and make a viscous system. At the same time, under the action of strong shearing and stirring, air is involved in the system to form a preliminary foam; the resulting preliminary foam is placed in a mold, heated by high-temperature saturated steam at 150°C, and the steam is controlled. The pressure is 0.27MPa,...
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