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Method for efficiently degrading solid waste of polyurethane coating

A technology for polyurethane coating and solid waste, which is applied in the recycling field of waste polyurethane, can solve the problems of declining physical properties, abandonment, and short product chain length, and achieves the effect of ensuring high added value and reducing the content of amine substances.

Pending Publication Date: 2022-02-01
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it was abandoned because of its significant decline in physical properties after aging, making the recycling of PU materials an important issue
In 2015, the total output of PU materials was about 202.5 million tons, but the recycling rate was less than 70%
[0005] For example, the publication date is May 18, 2011, and the Chinese invention patent application with the publication number CN102061009A discloses a method for recycling polyurethane waste to produce polyols. According to the teaching of the patent, the polyurethane waste particles, macromolecular polyester polyol Alcohol and antioxidants are fully mixed, added to the reaction kettle injected with small molecule diol in advance, under the protection of nitrogen, at a temperature of 180°C-240°C, react for 30-120 minutes, vacuum remove small molecule diol, and recover The regenerated polyether polyol contains more small molecular amines, and the product chain length is too short, which greatly restricts the use of recycled raw materials

Method used

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  • Method for efficiently degrading solid waste of polyurethane coating
  • Method for efficiently degrading solid waste of polyurethane coating
  • Method for efficiently degrading solid waste of polyurethane coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The polyurethane paint waste to be degraded in this embodiment is collected from the spraying work surface, the cutting operation work surface and the floor of the operation room in the paint production workshop.

[0041]Mix 75g PUW (polyurethane paint waste) with 268.0ml (300g) diethylene glycol and 5.52ml (7g) stannous octoate to form a degradation system, add it to a 500ml three-necked flask, add a magnet for magnetic stirring, and install A spherical condenser with water as the condensing agent. Fit the thermowell and stopper to the oblique opening and seal with parafilm. After pumping air from the top of the condenser tube for 10 minutes, nitrogen gas was introduced, and the nitrogen gas was continuously fed after repeating the operation 3 times to ensure that the reaction was carried out under a nitrogen atmosphere. Place the device in an oil bath, start heating and stirring, start timing when the thermometer shows 180°C, stop heating and stirring after 3 hours, ...

Embodiment 2

[0043] The used polyurethane waste composition of this embodiment is with embodiment 1

[0044] Mix 10g PUW (polyurethane paint waste) with 17.90ml (21.122g) diethylene glycol and 0.312ml (0.39g) stannous octoate to form a degradation system, add it to a 50ml three-necked flask, add a magnet for magnetic stirring, and put it on A spherical condenser tube with water as the condensing agent is installed at the port. Fit the thermowell and stopper to the oblique opening and seal with parafilm. After pumping air from the top of the condenser tube for 10 minutes, nitrogen gas was introduced, and the nitrogen gas was continuously fed after repeating the operation 3 times to ensure that the reaction was carried out under a nitrogen atmosphere. Place the device in an oil bath, start heating and stirring, start timing when the thermometer shows 180°C, stop heating and stirring after 2 hours, and let it cool naturally. After cooling, put the mixed product in a centrifuge tube, centrif...

Embodiment 3

[0046] The used polyurethane waste composition of this embodiment is with embodiment 1

[0047] Mix 5.0g PUW (polyurethane paint waste) with 17.90ml diethylene glycol and 0.260ml stannous octoate to form a degradation system, add it to a 50ml three-necked flask, add a magnet for magnetic stirring, and install water as a condensing agent on the top spherical condenser. Fit the thermowell and stopper to the oblique opening and seal with parafilm. After pumping air from the top of the condenser tube for 10 minutes, nitrogen gas was introduced, and the nitrogen gas was continuously fed after repeating the operation 3 times to ensure that the reaction was carried out under a nitrogen atmosphere. Place the device in an oil bath, start heating and stirring, start timing when the thermometer shows 180°C, stop heating and stirring after 2 hours, and let it cool naturally. After cooling, place the mixed product in a centrifuge tube, centrifuge at a high speed of 10,000 rpm for 8 min, ...

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Abstract

The invention provides a method for efficiently degrading solid waste of a polyurethane coating. The method comprises the following steps: S1, providing waste polyurethane; S2, in an inert atmosphere and with diethylene glycol as an alcoholysis agent and stannous octoate as a catalyst, subjecting the waste polyurethane to heating and alcoholysis and performing filtration so as to obtain a liquid-phase product; S3, adjusting the pH value of the liquid-phase product with acid, and carrying out a heating reaction to obtain a crude product; and S4, subjecting the crude product to centrifugal separation and taking a liquid phase so as to obtain polyether polyol. According to the invention, the chain length of the product is controlled, side reactions are reduced, and the recycling value of the degraded product is high.

Description

technical field [0001] The invention relates to the technical field of recycling waste polyurethane, in particular to a method for efficiently degrading solid waste of polyurethane coatings. [0002] technical background [0003] PU (polyurethane) materials are widely used in various industries due to their excellent performance. However, it was discarded because of its significant decline in physical properties after aging, making the recycling of PU materials an important issue. In 2015, the total output of PU materials was about 202.5 million tons, but the recycling rate was less than 70%. [0004] In order to achieve the sustainable development of the polyurethane material industry and the environmental protection, the research on the chemical degradation of polyurethane waste has been extensively increased. The chemical degradation methods of polyurethane materials have been developed so far, and the methods used in actual production mainly include pyrolysis, hydrolysi...

Claims

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Application Information

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IPC IPC(8): C08J11/24C08L75/04
CPCC08J11/24C08J2375/04Y02W30/62
Inventor 李国华叶飞吴世照
Owner ZHEJIANG UNIV OF TECH
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