Degrading method for recovering polyurethane

A polyurethane and polycarbonate technology, which is applied in the field of recycled polyurethane degradation, can solve the problems of reduced reaction controllability and poor mechanical properties of polyurethane, so as to reduce the risk of secondary environmental pollution, better comprehensive mechanical properties, and shorten the The effect of reaction time

Inactive Publication Date: 2012-06-20
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the polyurethane degradation method of the prior art, the recycled polyurethane is subjected to traditional alcoholysis under the coexistence of a small amount of water, and most of the urethane bonds in the product have been destroyed. poor feature performance

Method used

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  • Degrading method for recovering polyurethane
  • Degrading method for recovering polyurethane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] Add 50g of polycarbonate diol CD205 (Dalu) into a 500ml three-necked bottle with a stirrer, heat up to 220°C, start stirring, add 0.2g of potassium acetate and 0.5g of strontium carbonate, and add 0.5 % hindered phenol antioxidant, add 150g recycled polyurethane debris gradually, add 30min, after the polyurethane debris is completely dissolved, add 15g of water, continue to keep warm and stir for 1hr, when the stirring state drops to below 80°C, add 0.5g red aluminum solution was cooled to room temperature, discharged, and measured various indexes. The degradation product has a hydroxyl value of 94.2mgKOH / g, an amine value of 3.4mgKOH / g, an acid value of 0.8mgKOH / g, a Gardner chromaticity of 11, a viscosity of 8900cPs, a number average molecular weight of 6700, and a characteristic infrared absorption peak intensity ratio of urethane bonds and urea bonds of 7.3 : 1.

Embodiment 2

[0070] Add 100g polycarbonate diol CD220 (Dalu) into a 500ml three-necked bottle with a stirrer, heat up to 210°C, start stirring, add 0.2g sodium acetate and 0.4g strontium carbonate, add 0.5 % hindered phenol antioxidant, add 50g recycled polyurethane scraps gradually, add 20min, after the polyurethane scraps are completely dissolved, add 5g of water, continue to keep warm and stir for 4hrs, when the stirring state drops to below 50°C, add 0.5g of sodium borohydride solution was cooled to room temperature, discharged, and various indexes were measured. The degradation product has a hydroxyl value of 54.3mgKOH / g, an amine value of 2.2mgKOH / g, an acid value of 0.5mgKOH / g, a Gardner chromaticity of 13, a viscosity of 6560cPs, a number average molecular weight of 5300, and a characteristic infrared absorption peak intensity ratio of urethane bonds and urea bonds of 7.8 : 1.

Embodiment 3

[0072] Add 100g of polycarbonate diol CD210 (Dalu) into a 500ml three-necked bottle with a stirrer, heat up to 190°C, start stirring, add 0.2g of sodium acetate and 0.5g of strontium carbonate, and add 0.5 % hindered phenol antioxidant, add 100g recycled polyurethane debris gradually, add 30min, after the polyurethane debris is completely dissolved, add 10g of water, continue to keep warm and stir for 4hr, when the stirring state drops to below 50°C, add 0.5g of sodium borohydride solution was cooled to room temperature, discharged, and various indexes were measured. The degradation product has a hydroxyl value of 72.5mgKOH / g, an amine value of 3.6mgKOH / g, an acid value of 1.1mgKOH / g, a Gardner chromaticity of 11, a viscosity of 7400cPs, a number average molecular weight of 6100, and a characteristic infrared absorption peak intensity ratio of urethane bonds and urea bonds of 7.9 : 1.

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Abstract

The invention discloses a degrading method for recovering polyurethane. In the method, degrading is performed by taking polycarbonate dibasic alcohol as an alcoholysis agent in the presence of a catalyst and water which is 1-15 percent of the weight of polyurethane at the temperature of 180-230 DEG C; the catalyst is one or more of carbonate or carboxylate in IA or IIA group metal elements; the two ends of the molecular chain of the polycarbonate dibasic alcohol are hydroxyls; and the number average molecular weight of the polycarbonate dibasic alcohol is 500-2,000. In the method, polycarbonate dibasic alcohol is taken as an alcoholysis agent, so that the negative influences of an intermediate side product of primary amino radical is eliminated, and the urethane link content of a product is increased. Damage to byproduct primary amine in a degradation process in the prior art is eliminated, and the recycling value of a degrading product is raised.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a degradation method for recycling polyurethane. technical background [0002] Polyurethane is an important polymer material, widely used in automobile manufacturing, refrigerator manufacturing, transportation, civil construction, footwear, synthetic leather, fabric, electromechanical, petrochemical, mining machinery, aviation, medical treatment due to its excellent performance , agriculture and many other fields. At present, polyurethane foam is widely used. Soft foam plastics are mainly used for furniture and various cushion materials and sound insulation materials for vehicles; hard foam plastics are mainly used for household appliances insulation layer, house wall insulation and waterproof spray foam, pipe insulation materials, building boards, refrigerated vehicles and cold storage Heat insulation materials, etc.; semi-rigid foam plastics are used in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J11/24C08L75/04C08G18/40
CPCY02W30/62
Inventor 杨建文曾兆华庞来兴
Owner SUN YAT SEN UNIV
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