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Method for degrading waste polyurethane foam to recycle polyether polyol

A polyurethane foam and polyether polyol technology, which is applied in the field of waste polyurethane foam degradation and recovery of polyether polyol, can solve the problems of complex process, long degradation cycle and high temperature, and achieve simple process, high recovery efficiency and high utilization rate Effect

Inactive Publication Date: 2018-04-24
SHANDONG INOV NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing alcoholysis method for recycling waste polyurethane has the disadvantages of high temperature, the alcoholysis temperature is above 150°C, long degradation cycle, complicated process, high energy consumption, and high cost.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] In a 2L high-pressure reactor equipped with a stirrer, a heating temperature control device, a cooling device and a pressure sensor, add 600g of alcoholysis solution, wherein the compound mass ratio of ethylene glycol and propylene glycol in small molecule alcohols is 4:1, heat Raise the temperature to 150°C, and then add 6g of a solution aid. The compounding mass ratio of triethanolamine and potassium hydroxide in the solution aid is 3:1. Then gradually the waste and old flexible polyurethane foam (density is 12Kg / m2) of 1000g crushing 3 ) into a reaction kettle, react at 140°C for 5 hours to obtain a crude polyether polyol mixture, and then raise the temperature to 150°C for negative pressure degassing for 1 hour to obtain recovered crude polyether polyol.

[0029] Recycled polyether polyols have the following properties:

[0030] Hydroxyl number: 160mgKOH / g;

[0031] Amine value: 40mgKOH / g;

[0032] Viscosity at 25°C: 500mPas;

[0033] Appearance: wine red transp...

Embodiment 2

[0035] In a 2L high-pressure reactor equipped with a stirrer, a heating temperature control device, a cooling device and a pressure sensor, add 600g of alcoholysis solution, wherein the compound mass ratio of ethylene glycol and propylene glycol in small molecule alcohols is 3:2, heat Raise the temperature to 150°C, and then add 8g of a solution aid. The compounding mass ratio of triethanolamine and potassium hydroxide in the solution aid is 3:2. Then gradually the waste refrigerator polyurethane foam (density is 40Kg / m2) of 800g crushing 3 ) into a reaction kettle, react at 160°C for 5 hours to obtain a crude polyether polyol mixture, and then raise the temperature to 150°C for negative pressure degassing for 1 hour to obtain recovered crude polyether polyol.

[0036] Recycled polyether polyols have the following properties:

[0037] Hydroxyl number: 580mgKOH / g;

[0038] Amine value: 90mgKOH / g;

[0039] Viscosity at 25°C: 5400mPas;

[0040] Appearance: wine red transparen...

Embodiment 3

[0042] In a 2L high-pressure reactor equipped with a stirrer, a heating temperature control device, a cooling device and a pressure sensor, add 600 g of alcoholysis solution, wherein the compound mass ratio of ethylene glycol and dipropylene glycol in small molecule alcohols is 2:2, Heating is heated up to 140 ℃, then adds 6g solution aid, the composite mass ratio of triethanolamine and sodium hydroxide in the solution agent is 2:2, then gradually the hard imitation wood polyurethane of 800g pulverization (density is 320Kg / m 3 ) into a reaction kettle, react at 145°C for 4 hours to obtain a crude polyether polyol mixture, and then raise the temperature to 150°C for negative pressure degassing for 1 hour to obtain recovered crude polyether polyol.

[0043] Recycled polyether polyols have the following properties:

[0044] Hydroxyl number: 565mgKOH / g;

[0045] Amine value: 73mgKOH / g;

[0046] Viscosity at 25°C: 6000mPas;

[0047] Appearance: wine red transparent liquid.

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Abstract

The invention belongs to the technical field of recycling and reutilization of waste polyurethane foam products, and in particular relates to a method for degrading waste polyurethane foam to recyclepolyether polyol. The method provided by the invention comprises the following steps: mixing and compounding low molecular alcohol and degradation auxiliary agents to form an alcoholysis solution; adding the waste polyurethane foam into the alcoholysis solution and carrying out degradation reaction; carrying out vacuum degassing treatment on degraded crude polyether to obtain recyclable crude polyether polyol. According to the method provided by the invention, the low molecular alcohol is used as an alcoholysis agent and various degradation auxiliary agents are added, so that the recycling ofthe waste polyurethane foam with different physical and mechanical properties is realized under a relatively moderate condition through reaction mechanisms of chemical alcoholysis and alkaline hydrolysis, and recycled polyether polyols with various viscosity and different hydroxyl values are obtained; the method has the advantages of low cost, simple technology, high recycling efficiency, greenness and environment protection and the like; different polyurethane foam recycling requirements are met, and the method can be stably applied to subsequent polyurethane foaming.

Description

technical field [0001] The invention belongs to the technical field of recovery and reuse of waste polyurethane products, and in particular relates to a method for degrading waste polyurethane foam and recovering polyether polyols. Background technique [0002] Due to its excellent mechanical and physical properties, polyurethane foam is widely used in packaging, home appliances, construction, electrical and electronic, and automotive industries. It is estimated that about 12 million tons of polyurethane foam are needed every year and are increasing year by year. At the same time, a large amount of waste is generated. Therefore, the disposal of waste polyurethane foam has attracted more and more attention. [0003] At present, the processing methods of waste polyurethane foam mainly include the following types: The physical recycling method mainly adopts the pulverization and rebonding of polyurethane foam to realize the recycling and reuse of polyurethane foam. The recycli...

Claims

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Application Information

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IPC IPC(8): C08J11/24C08J11/28C08J11/16C08L75/08
CPCC08J11/16C08J11/24C08J11/28C08J2375/08Y02W30/62
Inventor 赵倩琼程铸洪宁晓龙董卫白维坤
Owner SHANDONG INOV NEW MATERIALS CO LTD
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