Method for recycling polyvinyl chloride wood-plastic composites waste
A wood-plastic material and polyvinyl chloride technology, which is applied in the field of recycling and reuse of polyvinyl chloride wood-plastic material waste, can solve the problems of the influence of the performance and stability of porous carbon materials, complex pore structure, closed-cell phenomenon, etc., and achieve economical The effect of significant benefits, excellent performance and low cost
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Embodiment 1
[0035] According to the mass ratio of 90:5:5, weigh 45kg of crushed polyvinyl chloride wood-plastic waste, NaHCO 3 2.5kg, 2.5kg of methyl methacrylate / acrylate copolymer, mixed at 200rpm for 25min, then extruded through a twin-screw extruder with a length-to-diameter ratio of 35:1 (manufacturer: Qingdao Kechuang Plastic Machinery Co., Ltd.) For granulation, set the temperature of the mixing section of the twin-screw extruder to 170°C, the temperature of the plasticizing section to 190°C, the temperature of the compression section to 200°C, and the temperature of the head to 180°C, and control the feeding speed of the material so that the material is The residence time in the twin-screw extruder was 25 minutes, resulting in pellets. Put the obtained pellets into an oven under inert gas N 2 In the atmosphere, start to heat up from 25°C to 300°C at a heating rate of 2.5°C / min, keep the temperature constant for 0.1h, then raise the temperature to 700°C at a heating rate of 5°C / mi...
Embodiment 2
[0037] By mass ratio 95:2:3, take by weighing the polyvinyl chloride wood-plastic material waste 47.5kg after pulverizing, Na 2 CO 3 1kg, 1.5kg of methyl methacrylate / styrene copolymer, mixed at 300rpm for 15min, then extruded through a twin-screw extruder with a length-to-diameter ratio of 35:1 (manufacturer: Qingdao Kechuang Plastic Machinery Co., Ltd.) For pellets, set the temperature of the mixing section of the twin-screw extruder to 170°C, the temperature of the plasticizing section to 190°C, the temperature of the compression section to 200°C, and the temperature of the head to 185°C. The residence time in the screw extruder was 26 minutes, resulting in pellets. Put the obtained granulated material into an oven, in an inert gas Ar atmosphere, start to heat up from 25°C to 350°C at a heating rate of 3.5°C / min, keep the temperature for 0.5h, and then raise the temperature to 725°C at a heating rate of 7.5°C / min , carbonized at a constant temperature for 1.25h, and then ...
Embodiment 3
[0039] According to the mass ratio of 98:1:1, weigh 49kg of crushed polyvinyl chloride wood-plastic waste, NaHCO 3 0.5kg, methyl methacrylate / acrylate copolymer 0.5kg, mixed at 400rpm for 5 minutes, then extruded through a twin-screw extruder with a length-to-diameter ratio of 35:1 (manufacturer: Qingdao Kechuang Plastic Machinery Co., Ltd.) For granulation, set the temperature of the mixing section of the twin-screw extruder to 170°C, the temperature of the plasticizing section to 190°C, the temperature of the compression section to 200°C, and the temperature of the head to 190°C, and control the feeding speed of the material so that the material is The residence time in the twin-screw extruder was 27 minutes, resulting in pellets. Put the obtained pellets into an oven under inert gas N 2 / Ar mixed gas atmosphere, the temperature was raised from 25°C to 400°C at a heating rate of 5°C / min, kept at a constant temperature for 1h, then raised to 750°C at a heating rate of 10°C / m...
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