Method for multi-stage degradation and recovery of polyether polyol in polyurethane foam

A technology of polyurethane foam and polyether polyol, which is applied in the direction of plastic recycling and recycling technology, can solve the problems of difficult degradation and residue of oligomers, and achieve the effects of low degradation cost, avoiding reprocessing, and simple process flow

Inactive Publication Date: 2021-11-12
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] This method solves the problem that the oligomers in the polyurethane foam degradation products are difficult to degrade and there are too many residues, the degradation process is mild, and the yield of polyether polyols is improved at the same time

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] In 10 liters of reactors equipped with mechanical stirring, heating temperature control, pressurization device, add the compound solution (adding 1% water) of the polyhydric alcohol of 2000g and primary degradation agent, the mass ratio of polyhydric alcohol and primary degradation agent is 10 : 1, wherein polyols are ethylene glycol and glycerol, the mass ratio is 1:1, the primary degradation agent is potassium hydroxide, sodium carbonate, and the mass ratio is 1:1, preheat the compound solution to 90°C, and keep for 0.5h After that, the temperature was raised to 130°C. Using the method of continuous feeding, 2000g of polyurethane foam was added within 10 minutes and the reaction was continued until the polyurethane foam particles disappeared. The sample was quickly cooled to 20°C to test the viscosity, and the viscosity of the system was maintained at 2500-3000mPa·s. Primary degradation stock solution. Add 1000g of polyol and secondary degradation agent (mass ratio: 1...

Embodiment 2

[0032] In 10 liters of reactors equipped with mechanical stirring, heating temperature control, pressurization device, add the compound solution (adding 2% water) of the polyhydric alcohol of 2000g and primary degradation agent, the mass ratio of polyhydric alcohol and primary degradation agent is 10 : 2, wherein the polyhydric alcohol is propylene glycol, glycerin, butanediol, the mass ratio is 1:1:1, the primary degradation agent is sodium hydroxide, sodium carbonate, the mass ratio is 1:1, and the compound solution is preheated to 100°C After keeping for 0.5h, the temperature was raised to 140°C. Using the method of continuous feeding, 2400g of polyurethane foam was added within 10min and the reaction continued until the polyurethane foam particles disappeared. The sample was quickly cooled to 20°C to test the viscosity, and the viscosity of the system was kept at 2500-3000mPa. After s, the primary degradation stock solution was obtained. Add 1400g of polyol and secondary d...

Embodiment 3

[0034] In 10 liters of reactors equipped with mechanical stirring, heating temperature control, pressurization device, add the compound solution (adding 2% water) of the polyhydric alcohol of 2000g and primary degradation agent, the mass ratio of polyhydric alcohol and primary degradation agent is 10 : 2, wherein the polyhydric alcohol is hexylene glycol, polyether polyol, the mass ratio is 2: 1, the primary degradation agent is sodium carbonate, triethylamine, and the mass ratio is 3: 1, preheating compound solution to 80 ℃, Keep the temperature for 0.5 hours and then raise the temperature to 140°C. Using the method of continuous feeding, add 2000g of polyurethane foam within 10 minutes and continue to react until the polyurethane foam particles disappear. Take a sample and quickly cool it to 20°C to test the viscosity, so that the viscosity of the system can be maintained at 2500-3000mPa·s After that, the primary degradation stock solution is obtained. Add 1000g of polyol an...

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PUM

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Abstract

The invention discloses a method for multi-stage degradation and recovery of polyether polyol in polyurethane foam. The method combines two or more of alcoholysis, acidolysis, aminolysis and hydrolysis for cooperative treatment, and adopts primary and secondary gradient degradation. According to the method, the problems that oligomers in a polyurethane foam degradation product are difficult to degrade and excessive residues exist are solved, the degradation process is mild, and meanwhile, the yield of recycled polyether polyol is increased. Through the synergistic effect of a degradation agent, a catalyst and process parameters, the viscosity and the hydroxyl value of the recycled polyether are effectively controlled, and the recycled product does not need to be purified and can be directly used for polyurethane foaming.

Description

technical field [0001] The invention relates to a method for recycling waste polyurethane foam, in particular to a method for synergistically using alcoholysis, acidolysis, aminolysis and hydrolysis to efficiently degrade polyurethane foam and recover polyether polyol through multistage reactions. Background technique [0002] Polyurethane soft foam, also known as sponge, is a non-degradable thermosetting polymer material. It is widely used in furniture, mattresses, pillows and other applications, but its waste usually causes serious environmental pollution or waste of resources. The most valuable sponge recovery method is to recover petroleum-based polyether polyols after chemical degradation of the sponge, and partially replace the foaming raw materials in the preparation of polyurethane foam, so as to achieve the purpose of recycling waste resources. [0003] The chemical structure of the sponge is complex. In addition to the urethane bond in the system, there are also ur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J11/24C08L75/08C08L71/00
CPCC08J11/24C08J2375/08C08J2471/00Y02W30/62
Inventor 何荟文俞涵静王旭张小军马猛陈思施燕琴苏杭
Owner ZHEJIANG UNIV OF TECH
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