Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for recycling polyurethane material

A polyurethane material and polyurethane waste technology, applied in recycling technology, plastic recycling, etc., can solve the problems of limited types and limited application prospects, and achieve the effect of reducing the cost of use and realizing the reuse of waste

Inactive Publication Date: 2021-07-23
江门市绿一茵环保科技有限公司
View PDF6 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The degraded polyurethane is polyester polyurethane, which limits the types of polyurethane. There are various types of polyurethane in the market, and this invention limits the application prospects.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A method for recycling polyurethane materials:

[0029] S1: Add 150-250Kg of glycol solvent, 2.0-3.0kg of alcoholysis aid and 0.5-2.0kg of catalyst, 600-1000r / min, slowly add 250-350kg of polyurethane waste, and heat up under stirring to 160-180°C;

[0030] S2: S1 is kept at a constant temperature of 160-180°C, under nitrogen protection, and stirred at 600-800r / min for 2-4h until the hydroxyl value does not change;

[0031] S3: Cool down S2 to 80-100°C, extract the upper mixed solution, if the polyurethane waste is a polishing material, then the upper layer is the mixed solution, and the lower layer is the inorganic hard filler in the polishing material (inorganic filler for grinding), if If it is conventional polyurethane waste, then the mixed liquid in the lower layer is an insoluble impurity,

[0032] S4: Warm up the mixed liquid in the upper layer to 170-210°C, carry out distillation at a negative pressure of -0.6—-1.0Mpa, stop the distillation until no other stea...

Embodiment 2

[0038] A method for recycling polyurethane materials:

[0039] S1: Add 150-250Kg of glycol solvent, 2.0-3.0kg of alcoholysis aid and 0.5-2.0kg of catalyst, 600-1000r / min, slowly add 250-350kg of polyurethane waste, and heat up under stirring to 160-180°C;

[0040] S2: S1 is kept at a constant temperature between 160-180°C, under nitrogen protection, and stirred at 600-800r / min for 2-4h until the hydroxyl value does not change;

[0041] S3: Lower the temperature of S2 to 80-100°C, extract the upper mixed solution, if the polyurethane waste is a polishing material, the upper layer is the mixed solution, and the lower layer is the inorganic hard filler in the polishing material (inorganic filler for grinding), if If it is conventional polyurethane waste, then the mixed liquid in the lower layer is an insoluble impurity,

[0042] S4: Warm up the mixed liquid in the upper layer to 170-210°C, carry out distillation at a negative pressure of -0.6—-1.0Mpa, and stop the distillation ...

Embodiment 3

[0048] Compare with 1# in the embodiment, change the dissolving material of polyurethane waste material and dibasic alcohol, others are identical with 1#, concrete serial number is 3#: after the change is dibasic alcohol solvent is 110kg, and polyurethane waste material is 300kg, the result The alcoholysis rate is below 60%, which affects the subsequent molecular weight change.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention belongs to the field of fine chemical engineering, and particularly relates to a method for recycling a polyurethane material. Waste polyurethane foam and the like are adopted as raw materials, alcoholysis is carried out on the polyurethane waste under specific process conditions, degradation of polyurethane is achieved, part of the raw materials used in the method can be recycled, and repeated circulation is achieved. According to the invention, the used polyurethane waste material is wide in source range. The alcoholysis product obtained in the polyurethane material recovery method can be applied to preparation of an absorption liquid of VOCs and preparation of an adhesive.

Description

Technical field [0001] The invention belongs to the field of fine chemicals, and specifically relates to a method for recycling and reusing polyurethane materials. Background technique [0002] Polyurethane foam is particularly important for the furniture market. The global demand for furniture cushions, carpet cushions and mattresses exceeds 5 million tons per year. Most polyurethanes are thermosetting polymers. When these materials are incinerated, many harmful chemicals such as isocyanates, hydrocyanic acid and dioxins are released, causing secondary pollution to the environment. [0003] Patent number "CN 110105620 A" discloses a degradation and recovery method of polyester polyurethane. This invention uses urea as a catalyst to degrade waste polyester polyurethane in an alcohol solution. The degradation products are separated and purified to obtain small molecule alcohols and amine. The degradable polyurethane is polyester polyurethane, which limits the type of polyur...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C08J11/24C08J11/28C08L75/04
CPCC08J11/24C08J11/28C08J2375/04Y02W30/62
Inventor 王丽芬
Owner 江门市绿一茵环保科技有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com