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Preparation method of aqueous polyurethane emulsion and aqueous polyurethane emulsion prepared thereby

A water-based polyurethane and polyurethane fiber technology, which is applied in the directions of polyurea/polyurethane coatings, polyurea/polyurethane adhesives, adhesive types, etc., can solve the problems such as the preparation of water-based polyurethane emulsions by regeneration of polyurethane fibers.

Inactive Publication Date: 2014-03-19
高松文
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] So far, there has been no report on the preparation of water-based polyurethane emulsion by recycling waste polyurethane fibers

Method used

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  • Preparation method of aqueous polyurethane emulsion and aqueous polyurethane emulsion prepared thereby
  • Preparation method of aqueous polyurethane emulsion and aqueous polyurethane emulsion prepared thereby
  • Preparation method of aqueous polyurethane emulsion and aqueous polyurethane emulsion prepared thereby

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Example 1 A water-based polyurethane emulsion

[0044] The ratio of each raw material (unit: g) is as follows:

[0045]

[0046] Among them, the waste polyurethane fiber is waste polytetrahydrofuran diol type polyurethane fiber obtained by dry spinning with a soft segment ratio of 90%.

[0047] Prepared by the following steps:

[0048] 1. Clean and dry 60 g of the waste polyurethane fibers. spare.

[0049] 2. Put 100g of PTMEG, 0.05g of alcoholysis catalyst, 5g of BDO and 7g of DMBA into a four-hole round bottom flask, control the temperature at 95-120°C, fill with nitrogen and stir evenly, add 60g of clean and dry waste polyurethane fiber to the reaction In the bottle; heat preservation reaction for 2 hours, until the liquid is clear and the viscosity drops significantly to 1200-1500cPs / 90℃;

[0050] 3. When the temperature of the material drops below 50°C, put 50g of PTMEG, 4.5g of BDO, and 1.25g of TMP into the reaction bottle and stir evenly, then add 75g of T...

Embodiment 2

[0051] Example 2 A water-based polyurethane emulsion

[0052] Ratio of each raw material (unit: g)

[0053]

[0054] Among them, the waste polyurethane fiber is a waste polycarbonate diol type polyurethane fiber obtained by dry spinning with a soft segment ratio of 87%.

[0055] Prepared by the following steps:

[0056] 1. Clean and dry 50g of waste polyurethane fiber. spare.

[0057] 2. Put 120g of polyol PBA, 0.05g of alcoholysis catalyst, 6g of HDO, and 4.7g of DMBA into a four-hole round bottom flask, control the temperature at 95-120°C, fill with nitrogen and stir evenly, and put the cleaned and dried waste polyurethane Add 50g of fiber into the reaction bottle; keep it warm for 2 hours until the liquid is clear and the viscosity drops to 1200-1500cPs / 90°C.

[0058] 3. When the temperature of the material drops below 50°C, put the remaining polyol PBA45g, HDO4.5g and TMP1.25g into the reaction bottle and stir evenly, then add HDI72g, control the reaction at 70-75...

Embodiment 3

[0060] Example 3 A water-based polyurethane emulsion

[0061] Ratio of each raw material (unit: kg)

[0062]

[0063] Among them, the waste polyurethane fiber is a waste polycarbonate diol type polyurethane fiber obtained by dry spinning with a soft segment ratio of 90%.

[0064] Prepared by the following steps:

[0065] 1. Clean and dry 200kg of waste polyurethane fibers. spare.

[0066] 2. Put 75kg of PTMEG, 0.1kg of alcoholysis catalyst, 6kg of BDO, and 4.7g of DMPA into the reactor, control the temperature at 95-120°C, fill with nitrogen and stir evenly, and add 200kg of clean and dry waste polyurethane fiber to the reaction kettle. In the bottle; keep warm for 4 hours until the liquid is clear and the viscosity drops to 1200-1500cPs / 90℃.

[0067] 3. When the temperature of the material drops below 50°C, put the remaining PTMEG100kg and BDO19kg into the reaction bottle and stir evenly, then add 200kg of isophorone diisocyanate, control the reaction at 70-75°C for ...

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Abstract

The invention provides an aqueous polyurethane emulsion preparation method. The preparation method comprises the following steps: subjecting waste polyurethane fibers to an alcoholysis treatment so as to obtain a mixture of hydroxyl terminated polyurethane with a molecular weight of 5000 to 10000 and polyol, and directly subjecting the mixture to processes of pre-polymerization, chain propagation, and emulsification so as to one-step obtain aqueous polyurethane emulsion; wherein the waste polyurethane fiber is preferably selected from waste polyether type polyurethane fiber and / or polycarbonate type polyurethane fiber generated by dry spinning or wet spinning; more preferably, the waste polyurethane fiber is selected from waste polytetramethylene glycol type polyurethane fiber and / or polycarbonate diol type polyurethane fiber whose soft section ratio is 85% or more; and most preferably, the waste polyurethane fiber is waste polytetramethylene glycol type polyurethane fiber whose soft section ratio is 85% or more. The preparation method provided a more reasonable reutilization method with a more additional value for waste high-grade polyurethane fibers.

Description

technical field [0001] The invention belongs to the field of polymer materials, and in particular relates to a method for preparing water-based polyurethane emulsion by using waste polyurethane fibers and the prepared water-based polyurethane emulsion. Background technique [0002] Polyurethane fiber is obtained by dissolving polyurethane in an organic solvent such as dimethylformamide, dimethylacetamide or dimethyl sulfoxide to obtain a spinning solution, which is formed into fibers by dry spinning or wet spinning, and then passed through the Aqueous solution of aliphatic diamine chain extender to obtain elastic polymer synthetic fiber. It has very good elasticity and physical and mechanical properties, and has been widely used in textiles, biomedicine and other fields. Correspondingly, the output of polyurethane fiber has also doubled. What followed was the generation of a large amount of waste polyurethane fibers. If the disposal of these wastes is simply carried out b...

Claims

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Application Information

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IPC IPC(8): C08G18/66C08G18/42C08G18/48C08G18/44C08G18/34C08G18/32C08G18/10D06N3/14C09J175/06C09J175/08C09D175/06C09D175/08C08L75/06C08L75/08
CPCC08G18/0823C08G18/12C08G18/4018C08G18/4854C08G18/6607C08G18/6625C08G18/664C08G18/6644C08G18/6659C08G18/6674C08G18/6677C08G18/6692C08L75/06C08L75/08C09D175/06C09D175/08C09J175/06C09J175/08D06N3/146C08G18/348
Inventor 高松文范浩军
Owner 高松文
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