Food-grade thermoplastic composite material as well as preparation method and application thereof
A composite material, food-grade technology, applied in the field of food-grade thermoplastic materials and their preparation, can solve the problems of easy moldy bamboo and wood drawers, heavy bamboo steamers, heavy steamers, etc., to improve surface finish, dimensional stability, and excellent mechanical properties. Performance and heat resistance, the effect of improving heat resistance
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[0033] Example 1
[0034] (1) Food-grade filler treatment: dry the used food-grade filler at 100-110 degrees to remove water, and then pass the dried food-grade filler through a mesh screen to obtain a food-grade filler with a particle size of 20-200nm;
[0035] (2) Put 5 parts of food-grade calcium carbonate, 20 parts of food-grade enhancer calcium sulfate whiskers, and 1.2 parts of food-grade calcium stearate in a mixer and mix for 3 to 5 minutes to obtain a food coated with calcium stearate. Grade calcium carbonate powder and calcium sulfate whiskers;
[0036] (3) Mix 100 parts of food grade polypropylene, 0.2 parts of titanium dioxide and the mixture in step (1) in a high-speed mixing agent for 2 to 3 minutes; add the resulting mixture to a twin-screw extruder for mixing at an extrusion temperature of 200 ~235℃, one zone is 200~215℃, the second zone is 215~235℃, the third zone is 215~235℃, and the fourth zone is 210~230℃; the screw speed of the twin screw extruder is 300~350r / mi...
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[0037] Example 2
[0038] (1) Food-grade filler treatment: dry the used food-grade filler at 100-110 degrees to remove water, and then pass the dried food-grade filler through a mesh screen to obtain a food-grade filler with a particle size of 20-200nm;
[0039] (2) Put 8 parts of food-grade calcium carbonate, 17 parts of calcium sulfate whiskers, and 1 part of food-grade paraffin in a blender for 3 to 5 minutes to obtain food-grade calcium carbonate powder and calcium sulfate whiskers coated with paraffin wax;
[0040] (3) Mix 100 parts of food-grade polycarbonate, 0.1 part of food-grade lemon yellow pigment and the mixture in step (1) in a high-speed mixing agent for 2 to 3 minutes; add the resulting mixture into a twin-screw extruder for mixing, Extrusion temperature is 220~300℃, among which the first zone is 220~230℃, the second zone is 250~280℃, the third zone is 260~300℃, and the fourth zone is 255~290℃; the screw speed of the twin screw extruder is 330~380r / min; The obtained...
Example Embodiment
[0041] Example 3
[0042] (1) Food-grade filler treatment: dry the used food-grade filler at 100-110 degrees to remove water, and then pass the dried food-grade filler through a mesh screen to obtain a food-grade filler with a particle size of 20-200nm;
[0043] (2) Put 9 parts of food-grade medical grade talc powder, 25 parts of calcium sulfate whiskers, and 1.5 parts of food-grade hydrocarbon wax in a mixer to mix for 3 to 5 minutes to obtain medical grade talc and calcium sulfate coated with hydrocarbon wax. Whiskers
[0044] (3) Mix 100 parts of food-grade high temperature resistant polyethylene, 0.2 parts of food-grade yellow pigment and the mixture in step (1) in a high-speed mixing agent for 2 to 3 minutes; add the resulting mixture into a twin-screw extruder for mixing , Extrusion temperature is 150~240℃, one zone 150~170℃, two zone 180~220℃, three zone 190~240℃, four zone 180~230℃; twin screw extruder screw speed is 200~300r / min; The obtained material is extruded, cooled,...
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