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Method for degrading and recycling waste solid polyurethane

A polyurethane and solid technology, applied in the field of polymer degradation and recycling applications, can solve the problems of stimulating highly toxic production and storage and transportation, equal consumption, secondary pollution, etc., to increase the scope of use and added value, improve efficiency, save energy effect

Active Publication Date: 2013-02-13
AODA KOALA PAINT HUIZHOU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods are often accompanied by gradual phase separation of the reaction system, and a large amount of nitrogen-rich degradation products containing urethane, urea, and amino groups in the lower layer have no use value and are discarded as waste, causing secondary pollution.
Although the polyurethane degradation technology under the action of the raw material alcoholysis agent can obtain more valuable diol raw materials such as polyether diols, and is easy to realize large-scale industrial operation, its energy consumption is high, and the diols obtained from production When alcohol recycled materials are reused, a considerable amount of isocyanate will inevitably be consumed, which will undoubtedly further stimulate the highly toxic and dangerous isocyanate industry to expand production, storage and transportation, and cause greater pressure on the environment and safety. That is to say, the current There are technical and environmental pressures in the mainstream alcoholysis recovery method of polyurethane

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] First, add 500g of the new functional alcoholysis agent (n=2, m=50 in the molecular formula) into a 2L three-neck reactor with a stirrer, heat up to 180°C, start stirring, add 0.4g of sodium carbonate and 0.8 g of strontium acetate, 2.5g of hindered phenol antioxidant, and then add 500g of recycled polyurethane debris gradually, and finish adding in 40 minutes. After the polyurethane debris is completely dissolved, continue to keep warm and stir until the viscosity is constant, and the temperature is lowered to 50°C under stirring. Below, add 2.0g sodium borohydride solution, cool to room temperature, discharge, measure each index. The number average molecular weight of the degradation product is 5179, the viscosity is 6189 cps, and the Dana color is No. 5. The acrylate double bond conversion rate in the photocuring performance test was 78%.

Embodiment 2

[0045] First, add 400g of the new functional alcoholysis agent (n=2, m=60 in the molecular formula) into a 2L three-neck reactor with a stirrer, heat up to 210°C, start stirring, add 0.4g of sodium carbonate and 0.8 g of strontium acetate, 2.5g of hindered phenol antioxidant, and then add 500g of recycled polyurethane debris gradually, and finish adding in 40 minutes. After the polyurethane debris is completely dissolved, continue to keep warm and stir until the viscosity is constant, and the temperature is lowered to 80°C under stirring. At the following time, add 2.0g red aluminum solution, cool to room temperature, discharge, and measure various indexes. The time required for degradation until the viscosity is basically stable is 4 hours, the number average molecular weight of the degradation product is 5645, the viscosity is 6482cps, and the Dana color is No. 5 color. In the photocuring performance test, the double bond conversion rate of acrylate was 80%.

Embodiment 3

[0047] First, add 500g of a new functional alcoholysis agent (n=2, m=80 in the molecular formula) into a 2L three-neck reactor with a stirrer, heat up to 180°C, start stirring, add 0.4g of sodium carbonate and 0.8 g of strontium acetate, 2.5g of hindered phenol antioxidant, and then add 500g of recycled polyurethane debris gradually, and finish adding in 40 minutes. After the polyurethane debris is completely dissolved, continue to keep warm and stir until the viscosity is constant, and the temperature is lowered to 50°C under stirring. Below, add 2.0g sodium borohydride solution, cool to room temperature, discharge, measure each index. The time required for degradation until the viscosity is basically stable is 3 hours. The number average molecular weight of the degradation product is 5179, the viscosity is 6189cps, and the Dana color is No. 6. The acrylate double bond conversion rate in the photocuring performance test was 78%.

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Abstract

The invention belongs to the technical field of polymer degrading and recycling. The method for degrading and recycling the waste solid polyurethane comprises the following steps of: firstly, adding a functionalized alcoholysis agent into a reaction kettle with a stirrer, heating the agent till the temperature rises to 180 to 220 DEG C, starting to stir the agent, adding a catalyst and a hindered phenolic antioxidant, gradually adding reclaimed scraps of polyurethane, allowing the reclaimed polyurethane scraps to dissolve completely, continuing the reaction with stirring till the viscosity is constant, cooling the mixture to below 50 to 80 DEG C with stirring, adding a decolorizer, and cooling the mixture to room temperature. The functionalized alcoholysis agent is a compound which has 1 to 2 hydroxys, 1 tertiary amine core and an acrylate group with molecular weight ranging from 500 to 2,000. The formula of the compound is (OH)n (NH) (CH2CHCOOR)m. According to the method, the degradation product of the waste solid polyurethane is polyurethane acrylate resin, which has high photocuring activity and can be widely used in the formula of photocurable paints.

Description

technical field [0001] The invention belongs to the technical field of polymer degradation and recovery application, and in particular relates to a method for degradation and recovery of waste solid polyurethane. Background technique [0002] Polyurethane is an important polymer material, widely used in automobile manufacturing, refrigerator manufacturing, transportation, civil construction, footwear, synthetic leather, fabric, electromechanical, petrochemical, mining machinery, aviation, medical treatment due to its excellent performance , agriculture and many other fields. At present, polyurethane foam is widely used. Soft foam plastics are mainly used for furniture and various cushion materials and sound insulation materials for vehicles; hard foam plastics are mainly used for household appliances insulation layer, house wall insulation and waterproof spray foam, pipe insulation materials, building boards, refrigerated vehicles and cold storage Heat insulation materials...

Claims

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Application Information

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IPC IPC(8): C08J11/24C08J11/10C08L75/14C09D175/14
CPCY02W30/62
Inventor 袁进松
Owner AODA KOALA PAINT HUIZHOU