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Polyurethane degraded product, polyurethane and method of forming a polyurethane

A polyurethane and decomposition product technology, which is applied in the field of polyurethane decomposition products, polyurethane and polyurethane formation, can solve the problems of polyol strength decline and achieve the effect of improving compressive strength

Inactive Publication Date: 2012-05-02
HITACHI LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the decomposition products obtained by the decomposition method of recycled urethane diol are mixed, there may be problems such as a decrease in the strength of the polyol produced.

Method used

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  • Polyurethane degraded product, polyurethane and method of forming a polyurethane
  • Polyurethane degraded product, polyurethane and method of forming a polyurethane
  • Polyurethane degraded product, polyurethane and method of forming a polyurethane

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Regarding Sample 1, the preparation method and the measurement method of the physical property values ​​will be described below.

[0055] 30 g of diethylene glycol was added to 30 g of polyurethane separately recovered from the waste refrigerator, heated to 180° C., and stirred for 5 hours to obtain 60 g of a diol decomposition solution of polyurethane. As a result of GC analysis, it was found that the decomposition liquid contained 1.5 wt% of 4,4-diphenylaminomethane. The obtained polyurethane decomposition solution was filtered, trimellitic anhydride 1.2 g was added, and it stirred at 80 degreeC for 30 minutes. The resulting solution was confirmed to produce the compound of formula 3 by liquid chromatography-mass spectrometry (LC-MS).

[0056] 【Chemical 4】

[0057]

[0058] (where, R represents group shown. )

[0059] Next, 10 wt% of polyurethane decomposition solution was added to a polyol obtained by mixing an appropriate amount of tolylene diamine polyethe...

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Abstract

The invention provides polyurethane characterized by comprising a structure represented by formula 1. In addition, the polyurethane degraded product provided by the invention is characterized in that the amine in the glycol decomposition products of the above polyurethane, such as toluene diamine and / or methylene-dianiline, is subjected to a reaction with compounds containing carboxylic acid anhydrides, carboxyl or hydroxyl. According to the utility model, primary amine in the decomposition products of polyurethane is converted into secondary amine. Meanwhile, the compression strength of re-forming polyurethane from the decomposition products of polyurethane is increased. In the formula 1, R represents any group, while R'represents, wherein n is 0-6 and X represents O or COO group.

Description

technical field [0001] The present invention relates to a method for modifying amines contained in polyurethane-forming polyols. Background technique [0002] With increasing awareness of global environmental issues such as global warming and ozone layer depletion, research and development of waste disposal technologies, particularly recycling technologies for waste plastics, has been rapidly progressing in recent years. From the viewpoint of resource recycling, as a recycling technology of waste plastics, chemical recycling using chemical treatment as raw material regeneration is useful. [0003] A diol decomposition method is known as one of the chemical recycling techniques of polyurethane (Patent Document 1). The diol decomposition method is a method in which waste polyurethane is heated and mixed with excess diol to decompose it to generate polyol and recover it. In this diol decomposition method, a compound having a primary amine, such as toluenediamine (TDA) and dip...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/76C08G18/66C08G18/50C08G18/38C07C233/80C07C231/02C09K5/14
CPCC07C235/70C08G18/08C08J11/10C08K5/17C08L75/04C08L2207/20
Inventor 北条房郎
Owner HITACHI LTD