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Method for regenerating polyol by waste polyurethane microwave depolymerization

A technology of polyol and polyurethane, which is applied in the field of degradation and recycling of waste polyurethane, which can solve the problems of environmental pollution, impact on the performance of finished products, and difficulty in crushing.

Active Publication Date: 2013-11-06
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

[0002] At present, the polyurethane waste materials, scraps, and waste polyurethane insoles and soles produced in industrial production are generally disposed of by landfill or incineration, which not only wastes polyurethane resources, but also pollutes the environment
Existing comparatively ripe polyurethane recycling technology mainly contains following several: a kind of is to pulverize and make filler, is exactly that polyurethane waste and old material is through screening, cleaning, and it is pulverized into the particle that particle diameter is about 3mm, and then at low temperature Or use a two-roller grinding room temperature pulverizer to crush the particles into a powder of 180-300μm, and then add the powder as a filler to fresh PU raw materials to make a finished product, but this method requires the particles to be ground into a finer powder. It is difficult to crush, and the addition amount does not exceed 10%, and it has a great impact on the performance of the finished product, so it can only be used in some products with low requirements
The second is to pulverize waste polyurethane, mix it with polyurethane adhesive, and then directly pass high-temperature gas such as water vapor to melt or dissolve the PU adhesive to bond the powdery waste PU, and then pressurize and solidify it into a certain shape. For plate materials, the biggest defect of this method is that the performance of the recycled products decreases, and it is only suitable for low-grade parts such as furniture and automobile linings. The application area is narrow, and the process is cumbersome, labor-intensive, and economic value is not high
However, this patent uses conventional reaction equipment, the reaction temperature is high, the production energy consumption is large, and the final product has to be distilled to remove small molecular glycols, which increases the production process and reduces production efficiency.
At present, there is no relevant report on the application of microwave in the depolymerization of polyurethane

Method used

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  • Method for regenerating polyol by waste polyurethane microwave depolymerization

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment one: the present embodiment is prepared as follows:

[0031] 1. Prepare materials by weight: waste polyurethane foam scraps 100g, 1,4-butanediol 40g

[0032]Take 0.1g of the catalyst composed of 1 part of sodium acetate and 0.5 part of triethanolamine

[0033] It is composed 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 Antioxidants Take 0.05g

[0034] 2. Mixing, mixing all the components of the ingredients together to get the mixture;

[0035] 3. Put the mixture obtained in step 2 into a microwave reactor with a working frequency of 2450±50MHz. Under the protection of nitrogen, set the microwave power to 200W, and control the temperature at 190°C-200°C for 15 minutes to obtain polyol liquid homogeneous Phase product, the acid value of the obtained polyol is about 0.5mgKOH / g, the viscosity is 2500cps, and the hydroxyl value is about 360mgKOH / g.

[0036] ...

Embodiment 2

[0037] Embodiment two: batching by weight

[0038] 1. Waste polyurethane foam scraps 100g, propylene glycol 80g

[0039] Take 0.5g of the catalyst composed of 1 part of zinc acrylate and 1 part of triethanolamine

[0040] It is composed 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 Antioxidants Take 0.1g

[0041] 2. Mixing, mixing all the components of the ingredients together to get the mixture

[0042] 3. Put the mixture obtained in step 2 into a microwave reactor with a working frequency of 2450±50MHz. Under the protection of nitrogen, under the microwave power of 500W, control the temperature at 200°C-210°C for 10 minutes to obtain a polyol liquid Homogeneous mixture, the acid value of the obtained polyol is about 0.7mgKOH / g, the viscosity is 800cps, and the hydroxyl value is about 480mgKOH / g.

Embodiment 3

[0043] Embodiment three: batching by weight

[0044] 1. 100g of waste polyurethane foam scraps, 100 parts of hydrogenated bisphenol A

[0045] Take 1g of the catalyst composed of 1 part of monopotassium maleate and 2 parts of N-methyldiethanolamine

[0046] It is composed of 3 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 Antioxidants Take 0.2g

[0047] 2. Mixing, mixing all the components of the ingredients together to get the mixture

[0048] 3. Put the mixture obtained in step 2 into a microwave reactor with a working frequency of 2450±50MHz. Under the protection of nitrogen, under the microwave power of 500W, control the temperature at 200°C-210°C for 10 minutes to obtain a polyol liquid Homogeneous mixture, the acid value of the obtained polyol is about 0.7mgKOH / g, the viscosity is 4000cps, and the hydroxyl value is about 180mgKOH / g.

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Abstract

The invention discloses a method for regenerating a polyol by waste polyurethane microwave depolymerization. The method is characterized in that waste polyurethane fragments, alcoholysis agents, catalysts and anti-oxidants are mixed into a mixture and the mixture is utilized for depolymerization preparation of a polyol, wherein the mixture comprises: by weight, 100 parts of the waste polyurethane fragments, 40 to 200 parts of the alcoholysis agents, 0.03 to 5 parts of the catalysts and 0.03 to 3 parts of the anti-oxidants. The method has simple processes, a short process flow and a high recovery rate. The polyol regenerated by the method has adjustable performance indexes and a wide application range.

Description

technical field [0001] The invention relates to the technical field of degradation and recycling of waste polyurethane, in particular to a method for degrading waste polyurethane to regenerate polyols using microwave technology. Background technique [0002] At present, polyurethane waste materials, scraps, and waste polyurethane insoles and soles produced in industrial production are generally disposed of by landfill or incineration, which not only wastes polyurethane resources, but also pollutes the environment. Existing comparatively ripe polyurethane recycling technology mainly contains following several: a kind of is to pulverize and make filler, is exactly that polyurethane waste and old material is through screening, cleaning, and it is pulverized into the particle that particle diameter is about 3mm, and then at low temperature Or use a two-roller grinding room temperature pulverizer to crush the particles into a powder of 180-300μm, and then add the powder as a fill...

Claims

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Application Information

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