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Method for recycling waste polyurethane product

A polyurethane and waste technology, applied in the field of polyurethane, can solve the problems of increasing efficiency, polluting urethane foam, reducing costs, etc., and achieves the effects of increasing efficiency, improving dimensional stability, and reducing costs.

Inactive Publication Date: 2015-06-10
NANJING MEIDING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It not only reduces the cost and increases the efficiency, but also solves the pollution problem caused by polyurethane foam to the environment

Method used

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  • Method for recycling waste polyurethane product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Example 1: 500 grams of diethylene glycol was added to a 1500 ml three-necked bottle with a stirring, heating and temperature control device, and 2.5 grams of potassium hydroxide was added, heated to 150-250 ° C, and then 500 grams of polyurethane waste The recyclate (rigid polyurethane foam) was cut and crushed into small pieces, slowly added to diethylene glycol, and stirred while heating. After about 12 hours, the foam was completely dissolved, and the low-molecular weight was removed in a vacuum for 20 minutes (you can also not remove the low-molecular weight). Molecule), to obtain reclaimed product A940 grams.

Embodiment 2

[0019] Embodiment 2: 900 grams of reclaimed matter obtained by the method of Example 1 are moved into the test kettle, and 900 grams of propylene oxide are passed into by the polyether polyol production method to carry out the polymerization reaction, and the reaction is finally neutralized with phosphoric acid. Get polyether polyol B1780 grams.

Embodiment 3

[0020] Embodiment 3: 900 grams of reclaimed matter obtained by the method of Example 1 was added according to the polyester polyol production method to add 600 grams of phthalic anhydride to carry out the esterification reaction to obtain polyester polyol C1400 grams.

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PUM

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Abstract

A method for recycling waste polyurethane products. The method is as below: cutting or crushing waste polyurethane product with surface non-polyurethane attachments removed into small pieces, carrying out alcoholysis to produce a mixture of polyol and aromatic amine, and reproducing polyether polyols or polyester polyols (a mixture of aromatic amines); preparing the obtained mixture of polyol and aromatic amine, polyether polyol and polyester polyol into a combined polyether for rigid foam; and foaming to prepare a new polyurethane rigid foam. The method conducts treatment and reutilization of waste polyurethane products through alcoholysis, not only reduces the cost and increases the benefit, but also eliminates the environment pollution caused by waste polyurethane foam. The method is applicable to for the regeneration and recycling of waste polyurethane rigid foam, semi hard foam, soft foam and elastic body in the production of polyurethane products.

Description

Technical field: [0001] The invention relates to the technical field of polyurethane, and more specifically relates to the chemical recovery and utilization method of waste polyurethane products produced in the production of polyurethane products and the like. technical background: [0002] Traditional physical recycling methods, pyrolysis methods, and hydrolysis methods cannot fully recycle waste polyurethane products. For the recycling of polyurethane flexible foam, from the perspective of pre-production economic investment, physical recycling is better. However, the performance of the finished product is poor, and it can only be used as a low-end product. Moreover, regardless of whether it is bonded, pressurized or extruded, the foam structure of polyurethane has been damaged to a considerable extent, resulting in the reduction of mechanical properties of recycled products and being eliminated. There is currently no effective recycling method for waste from rigid polyur...

Claims

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Application Information

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IPC IPC(8): C08G18/48C08G18/42C08J11/24
CPCY02W30/62
Inventor 朱卫其他发明人请求不公开姓名
Owner NANJING MEIDING TECH
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