Preparation method of aromatic high solid content water-borne polyurethane

A water-based polyurethane and water-based technology, used in textiles and papermaking, can solve the problems of increasing processes, equipment, energy consumption and costs, products without market competitiveness, and acetone cannot be recycled, saving organic solvent resources, The effect of improving the ecological level of products and international market competitiveness and eliminating fire hazards

Active Publication Date: 2013-05-01
浙江德美博士达高分子材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some people also learn from the method of adding a large amount of acetone to reduce viscosity during prepolymerization, and then steaming out acetone under negative pressure after emulsification. However, since acetone and water easily form an azeotropic mixture, it is difficult to remove the water in the solvent, so that the recovered acetone cannot Recycling, increased process, equipment, energy consumption and cost, and the product has no market competitiveness

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A kind of preparation method of high-solid surface layer resin, comprises the following steps:

[0039] (1) Preparation of water-based polyurethane A containing active end groups (-NH2):

[0040] Equipped with electric mixer, reflux condenser, thermometer and N 2 Add 50 parts of polycaprolactone diol with a relative molecular weight of 1000, 50 parts of polypropylene glycol with a relative molecular weight of 2000, 3.0 parts of butanediol, 4,4'-diphenyl Methane diisocyanate is MDI 28.7 parts, toluene diisocyanate is TDI 20 parts, catalyst dibutyltin laurate is DBTDL 0.1 part, in dry N 2 Under protection, react at 80°C for 2 hours, then add 8 parts of dimethylolpropionic acid for chain extension reaction for 2 hours, until the -NCO content reaches the theoretical value, the prepolymer is obtained. The theoretical value is determined by n-butylamine titration method .

[0041] Cool the prepolymer to 55°C and then add 6.0 parts of triethylamine for neutralization for 20...

Embodiment 2

[0048] A preparation method of high-solid foaming resin, comprising the following steps:

[0049] (1) Preparation of water-based polyurethane A containing active end groups (-NH2):

[0050] Equipped with electric mixer, reflux condenser, thermometer and N 2 In the reaction kettle of the import and export, add 100 parts of polycaprolactone diol with a relative molecular weight of 2000, 50 parts of polypropylene glycol with a relative molecular weight of 2000, 2.0 parts of ethylene glycol, and 30 parts of toluene diisocyanate (TDI) after pre-dehydration treatment. , 0.2 parts of catalyst environmental protection silver, in dry N 2 Under protection, react at 80°C for 3 hours, then add 5.0 parts of dimethylolpropionic acid for chain extension reaction for 2 hours, until the -NCO content reaches the theoretical value, the prepolymer is obtained. The theoretical value is determined by n-butylamine titration method .

[0051] Cool the prepolymer to 58°C and then add 3.7 parts of t...

Embodiment 3

[0058] A kind of preparation method of high-solid viscous resin, comprises the following steps:

[0059] (1) Preparation of water-based polyurethane A containing active end groups (-NH2):

[0060] Equipped with electric mixer, reflux condenser, thermometer and N 2 Add 200 parts of polypropylene glycol with molecular weight of 2000, 5.0 parts of hexylene glycol, 70 parts of 4,4'-diphenylmethane diisocyanate (MDI) and 0.1 part of stannous octoate catalyst into the reaction kettle of import and export. in dry N 2 Under protection, react at 70°C for 2 hours, then add 15.0 parts of dimethylolbutyric acid for chain extension reaction for 2 hours, until the -NCO content reaches the theoretical value to obtain a prepolymer. The theoretical value is determined by n-butylamine titration.

[0061] Cool the prepolymer to 51°C and then add 10.3 parts of triethylamine for neutralization for 15 minutes; add the neutralized prepolymer to 676 parts of deionized water containing 15 parts of d...

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PUM

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Abstract

The invention discloses a preparation method of aromatic high solid content water-borne polyurethane. The water-borne polyurethane which can be used for manufacturing synthetic leather and has aromatic high solid content of more than or equal to 50 % is obtained by using aromatic isocyanate as the raw material and adopting an interpenetrating network technology, a blocking technology and a post-crosslinking technology. The preparation method comprises the following steps: firstly, preparing water-borne polyurethane A comprising an active end group -NH2; then dispersing a polyurethane prepolymer B sealed by a -NCO end group in the polyurethane A, wherein due to small relative molecular mass and low body viscosity of the polyurethane B, the polyurethane B is very easy to disperse in the polyurethane A; and carrying out molecular-level compounding and interpenetrating on the polyurethane A and the polyurethane B to obtain high solid content water-borne polyurethane resin with concentration of more than or equal to 50 %. The molecular design and synthesis method provided by the invention not only breaks through the bottleneck on a aromatic high solid content water-borne polyurethane preparation technology and reduces cost, but also meets the requirements for technically reducing energy consumption and improving drying speed and physical property of a coating.

Description

technical field [0001] The invention belongs to the technical field of water-based polymer materials and synthetic leather manufacturing, and in particular relates to a preparation method of aromatic high-solid water-based polyurethane. Background technique [0002] my country is the world's largest producer and consumer of synthetic leather or PU leather. In 2011, there were more than 2,600 synthetic leather enterprises in the country, including more than 500 enterprises above designated size. The synthetic leather is mainly PVC leather. The synthetic output is 2.41 million tons, which is equivalent to 4.81 billion square meters. More than 70% of the total output. [0003] The pollution problem of the synthetic leather industry is also prominent. Solvent-based polyurethane resin is basically used in the traditional synthetic leather manufacturing process, and the volatilization of organic solvents in the slurry is the main source of environmental pollution. Usually, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L75/08C08L75/06C08G18/66C08G18/48C08G18/42C08G18/32C08G18/12C08G18/83C08J3/24D06N3/14
Inventor 范浩军
Owner 浙江德美博士达高分子材料有限公司
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