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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

Active Publication Date: 2014-12-17
JUHUA GROUP TECH CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the simple use of polyvinyl chloride to prepare porous carbon materials generally contains unreacted chlorine atoms, and is prone to closed-cell phenomenon, wide pore size distribution, complex pore structure and difficult to control, which leads to the performance and stability of porous carbon materials. influences

Method used

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Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

The invention discloses a method for recycling a polyvinyl chloride wood-plastic composites waste. The method includes following steps: (1) according to certain weight parts, mixing a crushed polyvinyl chloride wood-plastic composites waste, a carbonate or bicarbonate of alkali metals, and a plasticizer with stirring under a certain rotate speed, and performing extrusion at 170-200 DEG C to obtain a granulated material; (2) under an inert gas atmosphere, increasing a temperature from 25 DEG C to 700-750 DEG C with a two-stage temperature-increasing speed for performing carbonization, and decreasing the temperature to 25 DEG C with a temperature decreasing speed of 5-10 (DEG C) / min to obtain a carbonized material; soaking the carbonized material in an aromatic compound for 0.1-1 hour, taking out the carbonized material, under the inert gas atmosphere, increasing a temperature from 25 DEG C to 850-950 DEG C with a two-stage temperature-increasing speed, maintaining the temperature for 1-2 hours, and decreasing the temperature to 25 DEG C with a temperature decreasing speed of 15-20 (DEG C) / min to obtain a porous carbon material. The method is simple in technology, is green and environmental-protective, is low in cost and is good in economic benefit.

Description

technical field [0001] The invention relates to a method for recycling and reusing waste, in particular to a method for reusing and reusing polyvinyl chloride wood-plastic waste. Background technique [0002] Wood-plastic, that is, wood-plastic composite material, is a new type of composite material that has been booming at home and abroad in recent years. It refers to the use of polyethylene, polypropylene and polyvinyl chloride instead of the usual resin adhesive, with more than 35% -70% of the Wood flour, rice husk, straw and other waste plant fibers are mixed into new wood materials, and then processed by extrusion, molding, injection molding and other plastic processing techniques to produce boards or profiles. Wood-plastic composite materials are mainly used in building materials, furniture, logistics packaging and other industries. Polyvinyl chloride wood-plastic materials are wood-plastic materials prepared by extrusion processing of polyvinyl chloride and biomass s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02B09B3/00
CPCY02W30/78
Inventor 付铁柱张成德姜文军
Owner JUHUA GROUP TECH CENT
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