Recovery process of polyurethane waste

A polyurethane waste, thermoplastic polyurethane technology, applied in the field of polyurethane, can solve the problems of human health hazards, unsatisfactory degradation efficiency, waste of reusable resources, etc., to improve the recovery yield and quality, reduce degradation by-products, and effectively recover. The effect of using

Active Publication Date: 2013-10-30
佛山市高明区业晟聚氨酯有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In 2009, my country's polyurethane production capacity exceeded 4 million tons. The application of a large number of polyurethane products also produced a large amount of waste. Most of the waste was landfilled or incinerated. This not only wastes a lot of reusable resources, but also causes waste of land and air pollution
However, since CPU is a thermosetting material, the polymer chains are linked to each other, so it is not easy to recycle, and it is difficult to degrade
[0005] The existing methods of recycling polyurethane waste generally carry out the same recycling treatment for large categories of polyurethane waste, but there are still large differences between various types of polyurethane waste, such as thermoplastic polyurethane elastomer (TPU), cast polyurethane elastomer ( CPUE), if it is treated with the same recycling method, it will lead to poor recycling ...

Method used

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  • Recovery process of polyurethane waste
  • Recovery process of polyurethane waste
  • Recovery process of polyurethane waste

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0130] Example 1: The mixture of ethylene glycol (EG), diethylene glycol (DEG) and ethylene glycol (EG), diethylene glycol (DEG) degrades thermoplastic polyurethane elastomer (TPU)

[0131] Add 30.0 g of degradation agent, 15 g of thermoplastic polyurethane elastomer (TPU) and 0.2 g of lithium acetate (LiAc) to a 50 mL three-necked flask, and then install a reflux condenser, insert a thermometer, put in a stirrer, and protect with argon , Place the system in an oil bath and slowly heat up. When the temperature of the oil bath reaches about 220°C and the reaction temperature in the three-necked flask is about 215°C, the degradation reaction is maintained at this temperature. After 3 hours of reaction, the heating is stopped, and the system continues to stand in the oil bath. After the layer is completed, the reaction device is removed from the oil bath, and the oil is dripped dry. Put the three-necked flask containing the reactants in the refrigerator, and cool to about 15°C. The...

Embodiment 2

[0137] Example 2: The mixture of diethylene glycol, ethanolamine, diethylene glycol and ethanolamine degrades thermoplastic polyurethane elastomer (TPU)

[0138] Add 30.0g of degradation agent, 15g of thermoplastic polyurethane elastomer (TPU) and 0.2g of lithium acetate (LiAc) to a 50mL three-necked flask, then install a reflux condenser, insert a thermometer, put in a stir bar, and protect it with argon. Place the system in an oil bath and slowly heat up. Control the temperature of the oil bath at the designed temperature, stop heating after 3 hours of reaction, and keep the system in the oil bath. After the reaction product is automatically stratified, the reaction device is removed from the oil bath and the oil is dripped dry. Put the three-necked flask containing the reactants in the refrigerator, and cool to about 15°C. The upper layer becomes solid, and the lower layer is still liquid. Pour out the lower layer and recover the upper solid. The lower layer is a mixture of ...

Embodiment 3

[0143] Example 3. Ternary mixed degradation agent of propylene glycol, dipropylene glycol and ethanolamine degrades thermoplastic polyurethane elastomer (TPU)

[0144] Add 30.0g of degradation agent, 15g of thermoplastic polyurethane elastomer (TPU) and 0.2g of lithium acetate (LiAc) to a 50mL three-necked flask, then install a reflux condenser, insert a thermometer, put in a stir bar, and protect it with argon. Place the system in an oil bath and slowly heat up. Control the temperature of the oil bath at the designed temperature, stop heating after 3 hours of reaction, and keep the system in the oil bath. After the reaction product is automatically stratified, the reaction device is removed from the oil bath and the oil is dripped dry. Put the three-necked flask containing the reactants in the refrigerator, and cool to about 15°C. The upper layer becomes solid, and the lower layer is still liquid. Pour out the lower layer and recover the upper solid. The lower layer is a mixtu...

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Abstract

The invention discloses a recovery process of polyurethane waste. The recovery process comprises the following steps: (1) adding polyurethane waste, a degradation agent and a catalyst in a reaction kettle, and performing argon shield, placing the system in an oil bath to slowly warm, wherein the degradation agent is selected from a mixture of more than any two of alkyl polyols, the dosage of the degradation agent is 1-3 times of that of the polyurethane waste, the alkyl polyols comprise glycol, propanediol, diethylene glycol, dipropylene glycol, ethanolamine, diglycol and pentaerythritol; (2) stopping heating after keeping the degradation reaction at temperature A and reaction time B when the oil bath temperature is raised to the temperature A; and (3) performing recovery processing on a target reaction product by using the recovery process. By adopting the recovery process disclosed by the invention, the recovery efficiency can be obviously improved, byproducts produced during degradation of the polyurethane waste are reduced, and the recovery cost is lowered.

Description

Technical field [0001] The invention relates to the technical field of polyurethane, in particular to a recycling process of polyurethane waste. Background technique [0002] Polyurethane materials are mainly high molecular polymers prepared from raw materials such as polyisocyanates and polyols. In 2009, my country’s polyurethane production capacity exceeded 4 million tons. The application of a large number of polyurethane products also produced a large amount of waste. Most of the waste was landfilled or incinerated. This not only wasted a lot of reusable resources, but also caused Waste of land and air pollution. How to deal with these polyurethane wastes to realize their recycling has become an issue that must be paid attention to. The types of polyurethane materials involved in the present invention mainly include thermoplastic elastomers (TPE) and cast polyurethane elastomers (CPUE). [0003] Thermoplastic elastomer (TPE) is a material that has both the characteristics of t...

Claims

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Application Information

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IPC IPC(8): C08J11/28C08J11/24C08L75/04C08G18/40C08G18/30C08G101/00
CPCY02W30/62
Inventor 陈尚文陈池光陈尚明陈尚德
Owner 佛山市高明区业晟聚氨酯有限公司
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