Method for recycling polyurethane material

A polyurethane material and polyurethane waste technology, applied in recycling technology, plastic recycling, etc., can solve the problems of limited types and limited application prospects, and achieve the effect of reducing the cost of use and realizing the reuse of waste

Inactive Publication Date: 2021-07-23
江门市绿一茵环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The degraded polyurethane is polyester polyurethane, which limits the types of polyurethane. There are various types of polyurethane in the market, and this invention limits the application prospects.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A method for recycling polyurethane materials:

[0029] S1: Add 150-250Kg of glycol solvent, 2.0-3.0kg of alcoholysis aid and 0.5-2.0kg of catalyst, 600-1000r / min, slowly add 250-350kg of polyurethane waste, and heat up under stirring to 160-180°C;

[0030] S2: S1 is kept at a constant temperature of 160-180°C, under nitrogen protection, and stirred at 600-800r / min for 2-4h until the hydroxyl value does not change;

[0031] S3: Cool down S2 to 80-100°C, extract the upper mixed solution, if the polyurethane waste is a polishing material, then the upper layer is the mixed solution, and the lower layer is the inorganic hard filler in the polishing material (inorganic filler for grinding), if If it is conventional polyurethane waste, then the mixed liquid in the lower layer is an insoluble impurity,

[0032] S4: Warm up the mixed liquid in the upper layer to 170-210°C, carry out distillation at a negative pressure of -0.6—-1.0Mpa, stop the distillation until no other stea...

Embodiment 2

[0038] A method for recycling polyurethane materials:

[0039] S1: Add 150-250Kg of glycol solvent, 2.0-3.0kg of alcoholysis aid and 0.5-2.0kg of catalyst, 600-1000r / min, slowly add 250-350kg of polyurethane waste, and heat up under stirring to 160-180°C;

[0040] S2: S1 is kept at a constant temperature between 160-180°C, under nitrogen protection, and stirred at 600-800r / min for 2-4h until the hydroxyl value does not change;

[0041] S3: Lower the temperature of S2 to 80-100°C, extract the upper mixed solution, if the polyurethane waste is a polishing material, the upper layer is the mixed solution, and the lower layer is the inorganic hard filler in the polishing material (inorganic filler for grinding), if If it is conventional polyurethane waste, then the mixed liquid in the lower layer is an insoluble impurity,

[0042] S4: Warm up the mixed liquid in the upper layer to 170-210°C, carry out distillation at a negative pressure of -0.6—-1.0Mpa, and stop the distillation ...

Embodiment 3

[0048] Compare with 1# in the embodiment, change the dissolving material of polyurethane waste material and dibasic alcohol, others are identical with 1#, concrete serial number is 3#: after the change is dibasic alcohol solvent is 110kg, and polyurethane waste material is 300kg, the result The alcoholysis rate is below 60%, which affects the subsequent molecular weight change.

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PUM

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Abstract

The invention belongs to the field of fine chemical engineering, and particularly relates to a method for recycling a polyurethane material. Waste polyurethane foam and the like are adopted as raw materials, alcoholysis is carried out on the polyurethane waste under specific process conditions, degradation of polyurethane is achieved, part of the raw materials used in the method can be recycled, and repeated circulation is achieved. According to the invention, the used polyurethane waste material is wide in source range. The alcoholysis product obtained in the polyurethane material recovery method can be applied to preparation of an absorption liquid of VOCs and preparation of an adhesive.

Description

technical field [0001] The invention belongs to the field of fine chemicals, and in particular relates to a method for recycling polyurethane materials. Background technique [0002] Polyurethane foam is particularly important for the furniture market, and the annual global demand for furniture cushions, carpet cushions and mattresses exceeds 5 million tons. Most polyurethanes are thermosetting polymers, and many harmful chemicals such as isocyanate, hydrocyanic acid and dioxin will be released when incinerated, causing secondary pollution to the environment. [0003] Patent No. "CN 110105620 A" discloses a method for degradation and recovery of polyester polyurethane. In the invention, urea is used as a catalyst to degrade waste polyester polyurethane in alcohol solution. The degradation products are separated and purified to obtain small molecule alcohol and amine. The degraded polyurethane is polyester polyurethane, which limits the type of polyurethane. There are vario...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J11/24C08J11/28C08L75/04
CPCC08J11/24C08J11/28C08J2375/04Y02W30/62
Inventor 王丽芬
Owner 江门市绿一茵环保科技有限公司
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