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Method for acidolysis of soft polyurethane foam waste to produce polyol

A technology of polyurethane soft foam and waste, applied in recycling technology, plastic recycling, etc., can solve the problems of reducing amine value, abnormal application reaction, etc., and achieve reasonable results in various indicators

Inactive Publication Date: 2017-10-24
江苏世丰新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this patent has high production efficiency, it still belongs to the alcoholysis process. Similar to the aforementioned patent, it avoids the problem of abnormal application reaction caused by high amine value
[0005] The publication date is July 18, 2012, and the Chinese invention patent application with the publication number CN102585286 A discloses a method for regenerating polyols from waste polyurethane. Acid is used for post-treatment, which reduces the amine value of the product to a limited extent, but is essentially two different chemical degradation methods with the present invention

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Record by mass, 100 parts of polyurethane soft foam waste fragments, 80 parts of 5623 polyols, 10 parts of adipic acid, 10 parts of tartaric acid, 5 parts of natural zeolite, first add the raw material of removing soft foam fragments to the reactor, and heat up to 200 After ℃, gradually add the measured soft foam fragments within 3 hours. After the addition, raise the temperature to 240 ℃ and keep it warm for 6 hours. After the reaction is completed, cool down and discharge.

[0029] The obtained regenerated polyol had a hydroxyl value of 56 mgKOH / g, an amine value of 1 mgKOH / g, an acid value of 0.3 mgKOH / g, and a viscosity of 2000 cps.

Embodiment 2

[0031] According to mass, 100 parts of polyurethane soft foam waste fragments, 10 parts of 5623 polyol, 20 parts of malic acid, AlCl 3 6 parts, first add the raw materials for removing soft foam fragments to the reactor, after heating up to 200°C, gradually add the measured soft foam fragments within 3 hours, after adding, raise the temperature to 240°C, keep it warm for 8 hours, and the reaction is over , cooling and discharging;

[0032] The obtained regenerated polyol had a hydroxyl value of 42 mgKOH / g, an amine value of 3 mgKOH / g, an acid value of 0.4 mgKOH / g, and a viscosity of 2800 cps.

Embodiment 3

[0034] By mass, 100 parts of polyurethane soft foam waste fragments, 1 part of 5623 polyol, 9 parts of palmitic acid, WO 3 -ZrO 2 6 parts of catalyst, first add the raw materials for removing soft foam waste fragments to the reactor, after heating up to 200°C, gradually add the measured soft foam fragments within 5 hours, after adding, raise the temperature to 240°C, and keep it warm for 10 hours , the reaction is completed, the temperature is lowered and the material is discharged;

[0035] The obtained regenerated polyol had a hydroxyl value of 36 mgKOH / g, an amine value of 5 mgKOH / g, an acid value of 0.5 mgKOH / g, and a viscosity of 3800 cps.

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Abstract

The invention provides a method for acidolysis of soft polyurethane foam waste to produce polyol, belonging to the technical field of recycling of solid waste. The invention provides the method for high-added-value utilization of soft polyurethane foam waste to overcome the problems of environmental pollution and occupation of great production space. The method uses the following raw materials by mass: 100 parts of fragments of soft polyurethane foam waste, 1 to 100 parts of an acidolysis agent, 1 to 10 parts of a catalyst and 1 to 100 parts of a diluent. The method comprises the following steps: 1, pumping the metered acidolysis agent, catalyst and diluent into a reaction vessel and carrying out heating to 160 to 200 DEG C; 2, adding the fragments of soft polyurethane foam waste at a uniform speed until the mass of the fragments reaches preset mass; and 3, carrying out heating to 230 to 250 DEG C, maintaining the temperature for 6 to 12 h and then carrying out cooling and discharging. The regenerated polyol produced in the invention has the advantages of low amine value and no influence to foaming.

Description

technical field [0001] The invention belongs to the technical field of solid waste recovery and reuse, and relates to a method for producing polyols from polyurethane flexible foam wastes by acidolysis. Background technique [0002] At present, in the polyurethane flexible foam industry, sponge waste accounts for about 10-30% of the production volume, which is of low value and will bring unusual fire protection, environmental protection and cost pressures to manufacturers, seriously eroding the profitability of enterprises. In summary, The transformation of sponge waste into treasure has become a major research topic with innovative significance in the industry. [0003] The publication date is September 29, 2010, and the Chinese invention patent application with the publication number CN101845152 A discloses a method for recycling polyurethane foam waste to prepare polyester polyol. According to the report of the patent, the method is an alcoholysis method. It needs to be ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J11/26C08J11/16C08J11/24C08L75/04
CPCC08J11/16C08J11/24C08J11/26C08J2375/04Y02W30/62
Inventor 阮国桥
Owner 江苏世丰新材料有限公司