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Method for recycling waste polyurethane

A recycling method, polyurethane technology, applied in the direction of plastic recycling, recycling technology, chemical instruments and methods, etc., can solve the problem of high cost of industrialization, and achieve the effect of avoiding costs and improving economic benefits

Inactive Publication Date: 2014-03-12
杨晓林
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ammonolysis and alkaline hydrolysis are still in the stage of laboratory research, and the cost of industrialization of pyrolysis and hydrocracking is too high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Put 100 grams of waste polyurethane into the reactor, add 0.05 grams of dibutyltin dilaurate, feed steam heated to 220°C from the lower end of the reactor, keep the temperature of the reactor at 220°C, and react for 24 hours. The reaction was stopped, and the remaining solid in the reactor was dried and weighed, weighing 65.4 grams, with a decomposition rate of 34.6%. Undecomposed polyurethane can participate in the cracking process of the next batch. The formed decomposition mixture is cooled down by a cooling device, separated and purified to obtain acid, alcohol, isocyanate and fuel oil. The obtained polyol had a hydroxyl number of 83.

Embodiment 2

[0012] Put 100 grams of waste polyurethane into the reactor, add 0.2 gram of triethanolamine, feed propylene glycol vapor heated to 350° C. from the lower end of the reactor, keep the temperature of the reactor at 350° C., and react for 15 hours. The reaction was stopped, and the remaining solid in the reactor was dried, weighed, and weighed 34.7 grams, with a decomposition rate of 65.3%. Undecomposed polyurethane can participate in the cracking process of the next batch. The formed decomposition mixture is cooled down by a cooling device, separated and purified to obtain acid, alcohol, isocyanate and fuel oil. The obtained polyol had a hydroxyl number of 78.

Embodiment 3

[0014] 100 grams of waste polyurethane is loaded into the reactor, 0.2 gram of dibutyltin dilaurate is added, and propylene glycol vapor heated to 500° C. is introduced from the inlet of the lower end of the reactor. The temperature of the reactor is kept at 500° C. and reacted for 12 hours. The reaction was stopped, and the remaining solid in the reactor was dried and weighed, weighing 21.3 grams, and the decomposition rate was 78.7%. Undecomposed polyurethane can participate in the cracking process of the next batch. The formed decomposition mixture is cooled down by a cooling device, separated and purified to obtain acid, alcohol, isocyanate and fuel oil. The obtained polyol had a hydroxyl number of 82.

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PUM

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Abstract

The invention relates to a method for recycling waste polyurethane. In the presence of a catalyst, high temperature steam is used for thermal cracking on waste polyurethane. The cracking products are subjected to separation and purification to obtain acid, alcohol and oligomers thereof, micromolecular polymeric materials such as isocyanate or filler and fuel oil. The recycling method overcomes the disadvantages of a traditional physical recycling method, such as high recycling cost and environmental pollution caused by heat recovery, and avoids the defects of a traditional high temperature thermal cracking method, such as susceptibility to fire, low thermal efficiency, carbon formation and short service life of equipment. After treatment, the recycling method does not generate new waste or have a negative impact on the environment.

Description

technical field [0001] The invention relates to a method for recycling waste polyurethane, which belongs to the field of recycling chemical materials. Background technique [0002] Polyurethane (referred to as PU) is a polymer made of polyisocyanate, polyether polyol or polyester polyol, small molecule polyol, polyamine or water and other chain extenders or crosslinking agents. By changing the type and composition of raw materials, the shape and performance of the product can be greatly changed, and it can be used to manufacture plastics, rubber, fibers, rigid and flexible foams, adhesives and coatings. With the increasing use of polyurethane in the national economy and the increasing consumption, the recycling and reuse of its waste is also increasingly valued by people. In 1995, the United States "International Modern Plastics" once stated that the recycling of PU has become a problem It has become one of the major problems that the PU industry is facing and needs to be s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J11/14C08L75/04C07C27/00C07C263/00C10G1/00
CPCY02P20/50Y02W30/62
Inventor 杨晓林
Owner 杨晓林
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