Directed degradation method of waste polyurethane material

A polyurethane material and polyurethane technology, which is applied in the field of directional degradation of waste polyurethane materials, can solve a large number of metal salts, carbon-carbon bond structure side reactions and other problems, and achieve the effects of low price, reduced recycling cost, and low solvent cost

Active Publication Date: 2019-08-09
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that there are chemical bonds such as urethane bonds, ether bonds, ester bonds, and urea bonds in the polyurethane resin, and diol or amine compounds are easier to cut off the urethane bonds and form a liquid through an exchange reaction.
National invention patents with publication numbers CN106519292A and CN106565238A disclose a method of using coordinative unsaturated metal ions to catalyze the selective opening of carbamate bonds and urea bonds in polyurethane to recover high value-added chemicals. A large number of metal salts, and it is easy to cause side reactions in the carbon-carbon bond structure of some compounds

Method used

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  • Directed degradation method of waste polyurethane material
  • Directed degradation method of waste polyurethane material
  • Directed degradation method of waste polyurethane material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The waste polyurethane material to be degraded in this embodiment is poly-1,2-propylene glycol polyether polyurethane, and the specific structure is as follows:

[0038]

[0039] Mix 0.4g of pulverized waste polyurethane materials with a particle size of 0.01cm, 0.004g of urea, and 0.4g of 100% ethanol to form a 0.804g degradation system, and react in a hydrothermal kettle at 100°C for 12h , after the reaction degradation is completed and cooled, add 8g of water to the reaction system and let it stand. After the precipitation is complete, filter, wash and dry the filter cake to obtain 0.13g of aromatic polyamines; the filtrate is extracted and layered with chloroform, and the layers are obtained The chloroform phase was dried at 80° C. to obtain 0.25 g of long-chain polyether polyols; the aqueous phase obtained by stratification was recovered and reused for the degradation of polyurethane.

Embodiment 2

[0041] The structure of the waste polyurethane material to be degraded in this embodiment is the same as in Example 1

[0042] Mix 0.4g of pulverized waste polyurethane materials with a particle size of 0.05cm, 0.2g of piperazine, and 4g of 60% acetone to form a 4.6g degradation system, and react in a hydrothermal kettle at 140°C for 8 hours After the reaction degradation is completed and cooled, add 20g of water to the reaction system and let it stand. After the precipitation is complete, filter, wash and dry the filter cake to obtain 0.11g of aromatic polyamines; The toluene phase was dried at 100° C. to obtain 0.29 g of long-chain polyether polyols; the water phase obtained by layering was recovered and reused for the degradation of polyurethane.

Embodiment 3

[0044] The structure of the waste polyurethane material to be degraded in this embodiment is the same as in Example 1

[0045] The 0.4g pulverized waste polyurethane material with a particle size of 1cm and 0.8g 1,4-dimethylpiperazine and 20g mass fraction are mixed with 20% methanol to form a 21.2g degradation system. The reaction was carried out at ℃ for 1 hour. After the reaction degradation was completed and cooled, 42.4 g of water was added to the reaction system and left to stand. After the precipitation was complete, it was filtered, the filter cake was washed and dried to obtain 0.16 g of aromatic polyamines; the filtrate was washed with petroleum Ether extraction and layering, the petroleum ether phase obtained by layering was dried at 85° C. to obtain 0.23 g of long-chain polyether polyols; the aqueous phase obtained by layering was recovered and reused for the degradation of polyurethane.

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Abstract

The invention belongs to the field of organic solid waste recycling treatment, and concretely relates to a directed degradation method of a waste polyurethane material. The method is mainly used for solving the technical problems of low catalytic efficiency, difficulty in selective bond breaking, difficulty in separation of a product after the completion of a reaction, and failed recovery of chemicals with high added values. The method combines the following steps: mixing the waste polyurethane material with an organic amine or amide catalyst and a reaction solvent to form a degradation system, carrying out a degradation reaction, cooling the obtained system, adding water, filtering the obtained solution, and washing and drying the obtained filter cake to obtain an aromatic polyamine substance; performing extraction layering on the obtained filtrate with an organic solvent, and drying an organic solvent phase obtained after the layering to obtain a long-chain polyether polyol substance; and reusing an aqueous phase obtained after the layering in the degradation of the polyurethane. The method can efficiently activate and degrade carbamate bonds and urea bonds in molecules, has no obvious catalytic activity on the ether bond of the polyether polyol part and the carbon-carbon bond structure in the molecules, and allows the aromatic polyamine substance and the polyether polyol substance with high added values to be obtained through simple treatment and separation.

Description

technical field [0001] The invention belongs to the field of organic solid waste resource treatment, and in particular relates to a method for directional degradation of waste polyurethane materials. [0002] technical background [0003] Polyurethane is a polymer material with a huge output. Due to its excellent performance, it is widely used in various fields of our life and production. At the same time, due to its huge waste output, the harmless and resourceful treatment of polyurethane waste is very important. For example, the insulation material of refrigerators is a kind of rigid polyurethane foam. my country has entered the peak period of discarding old refrigerators, and tens of millions of refrigerators are scrapped every year. The quality of rigid polyurethane foam accounts for 9% of the total mass of the refrigerator, and most of the waste is landfilled or incinerated, which not only wastes a lot of reusable resources, but also causes land waste and air pollution. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J11/28C08L71/00C07C209/62C07C211/50C08L75/08
CPCC07C209/62C08J11/28C08J2375/08C08L71/00C07C211/50Y02W30/62
Inventor 侯相林李红艳邓天昇王玉琪
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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