Method for regenerating polyol by using waste polyurethane

A polyol and polyurethane technology, which is applied in the field of waste polyurethane recycling, can solve the problems of no post-treatment process, high product viscosity, high reactivity, etc., and achieve the effects of easy control, low product viscosity and high alcoholysis rate

Active Publication Date: 2012-07-18
希肤科技(上海)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the current method of using waste polyurethane to regenerate polyols, the production process is to add all the raw materials into the reactor at one time, and generally there is no post-treatment process. The disadvantages are high product viscosity, low alcoholysis rate, and the regenerated polyether Polyols contain more small molecule amines, and the reactivity is too high, so it is difficult or impossible to use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The present embodiment is prepared as follows:

[0032] 1. Prepare materials by weight: waste polyurethane foam scraps 100g;

[0033] Polyethylene glycol 200 50g;

[0034] Sodium acetate 0.1g, triethanolamine 1.0g;

[0035] According to the ratio of 1 part of tetrakis [β-(3, 5-di-tert-butyl-4-hydroxyphenyl) propionate] pentaerythritol ester and 1 part of tris (2, 4-di-tert-butylphenyl) phosphite Composition of antioxidants, take 0.1g;

[0036] acetic acid 5g,

[0037] 2. Put polyethylene glycol 200 into the reactor, under the protection of nitrogen, heat up to 210°C-220°C, then add sodium acetate, triethanolamine and antioxidant, then add 40g of waste polyurethane foam scraps, and then Add 15g of waste polyurethane foam scraps every 15 minutes, and keep warm for 2 hours after adding all the materials. Then lower the temperature to 150° C., add 5 g of acetic acid as a treatment agent, and keep the temperature for 2 hours to obtain a liquid homogeneous mixture of pol...

Embodiment 2

[0039] The present embodiment is prepared as follows:

[0040] 1. Prepare materials by weight: waste polyurethane foam scraps 100g;

[0041] 1,4-butanediol 40g;

[0042] Sodium acetate 0.1g, triethanolamine 1.0g;

[0043] According to the ratio of 2 parts of tetrakis [β-(3, 5-di-tert-butyl-4-hydroxyphenyl) propionate] pentaerythritol ester and 1 part of tris (2, 4-di-tert-butylphenyl) phosphite Composition of antioxidants, take 0.05g;

[0044] acetic acid 5g,

[0045]2. Put 1,4-butanediol into the reactor, raise the temperature to 200°C-220°C under the protection of nitrogen, then add sodium acetate, triethanolamine and antioxidant, and then add 20g of waste polyurethane foam scraps , and then add 20 g of waste polyurethane foam scraps every 15 minutes, and keep warm for 2 hours after all the materials are added. Then lower the temperature to 150° C., add 5 g of acetic acid as a treatment agent, and keep the temperature for 2 hours to obtain a liquid homogeneous mixture o...

Embodiment 3

[0047] The present embodiment is prepared as follows:

[0048] 1. Prepare materials by weight: waste polyurethane foam scraps 100g;

[0049] Propylene glycol 80g;

[0050] Zinc acrylate 0.1g, triethanolamine 0.2g;

[0051] According to the ratio of 2 parts of tetrakis [β-(3, 5-di-tert-butyl-4-hydroxyphenyl) propionate] pentaerythritol ester and 1 part of tris (2, 4-di-tert-butylphenyl) phosphite Composition of antioxidants, take 0.1g;

[0052] Propionic acid 10g,

[0053] 2. Put propylene glycol into the reactor, under the protection of nitrogen, heat up to 200°C-220°C, then add zinc acrylate, triethanolamine and antioxidant, then add 20g of waste polyurethane foam scraps, and then add every 15min 20g of waste polyurethane foam scraps, after adding all the materials, keep warm for 3 hours. Then the temperature was lowered to 120° C., 10 g of propionic acid was added, and the temperature was maintained for 3 hours to obtain a liquid homogeneous mixture of polyols. The aci...

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Abstract

The invention discloses a method for regenerating polyol by using waste polyurethane. In the method, fragments of polyurethane waste, an alcoholysis agent, a catalyst, an antioxidant and a treating agent are used as raw materials; and the method comprises the following reaction steps: (1) adding the alcoholysis agent in a reaction kettle, heating up to 200-220 DEG C under the protection of nitrogen, and adding the catalyst and antioxidant; (2) adding the fragments of polyurethane waste, and preserving the temperature for 1-5 hours; and (3) cooling to 80-150 DEG C, adding the treating agent, preserving the temperature for 1-3 hours to obtain a polyol liquid homogeneous phase mixture, wherein the fragments of polyurethane waste are added at least twice in the step (2). The method disclosed by the invention has high alcoholysis rate; the product has low viscosity, moderate reactivity and easiness for use; and the prepared polyurethane product has excellent performance.

Description

technical field [0001] The invention relates to the technical field of recycling waste polyurethane, in particular to a method for regenerating polyols from waste polyurethane. Background technique [0002] Polyurethane (referred to as PU) is a polymer made of polyisocyanate, polyether polyol or polyester polyol or / and small molecule polyol, polyamine or water and other chain extenders or crosslinking agents. Polyurethane products are widely used in footwear, synthetic leather, fabrics, medical care, agriculture and many other fields. As the use of polyurethane materials in the national economy is becoming wider and wider, and the amount of use is increasing, the recycling and reuse of its waste is also increasingly valued by people. [0003] At present, there are three main methods for the recycling of polyurethane: physical method, chemical method, and energy method. There have been many reports and practical technologies in the physical method. The performance of the pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J11/10C08J11/24C08J11/26C08G18/28
CPCY02W30/62
Inventor 何晓辉刘志贤谢义财
Owner 希肤科技(上海)有限公司
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