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Waterborne polyurethane and preparation method thereof

A water-based polyurethane and prepolymer technology, which is applied in the preparation of water-based polyurethane and the field of water-based polyurethane, can solve the problems of water-based polyurethane comprehensive performance differences, prepolymer emulsified chain extension unevenness, high viscosity, etc., to achieve uniform dispersion of emulsified chain extension Effect

Active Publication Date: 2014-06-18
蚌埠金黄山凹版印刷有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a water-based polyurethane, which solves the problem that the existing water-based polyurethane prepolymer has an excessively high viscosity, which causes uneven emulsification and chain extension of the prepolymer by water, resulting in differences in the comprehensive performance of the water-based polyurethane.

Method used

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  • Waterborne polyurethane and preparation method thereof
  • Waterborne polyurethane and preparation method thereof

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preparation example Construction

[0035] The preparation method of the water-based polyurethane of the present invention uses hydrogen peroxide to decompose water through the reaction process instead of the traditional method of directly adding water to carry out chain extension emulsification and dispersion reaction on the water-based polyurethane prepolymer, which can make the emulsification, chain extension and dispersion more uniform, and then use The pH regulator adjusts the pH value of the system to obtain waterborne polyurethane with balanced properties.

[0036] Traditional water is directly added to the water-based polyurethane prepolymer, but because of the high viscosity of the prepolymer, directly adding water will lead to uneven emulsification of the prepolymer, asynchronous chain extension reaction and uneven dispersion, resulting in the final synthesized emulsion The particle size distribution and molecular weight distribution are wide, and the viscosity of the emulsion is too high. The internal...

Embodiment 1

[0038] Step 1, weigh 10 parts of isophorone diisocyanate IPDI, 22 parts of polyethylene glycol PEG, 0.5 parts of dimethylol propionic acid DMPA, 0.1 part of 1,4-butanediol BDO, hydrogen 1 part of potassium oxide KOH, 4 parts of N-methylpyrrolidone NMP, 3 parts of acetone, hydrogen peroxide H 2 o 2 50 parts, 0.05 parts of butyltin dilaurate DBTDL;

[0039] Step 2, add IPDI and PEG to a four-necked flask with a reflux condenser, a thermometer and a stirring device, put the flask in a constant temperature water bath at 85°C and stir for 2 hours, then add DBTDL to react for 30 minutes to make IPDI and PEG adequate response;

[0040] During the reaction process, use the di-n-butylamine titration method to detect the remaining amount of isocyanate group (-NCO) in the reaction solution; when the amount of -NCO in the sample reaches the theoretical value, start to cool down;

[0041] Step 3, the temperature of the reaction solution is lowered to 50°C, DMPA is fully dispersed in NMP...

Embodiment 2

[0047] Step 1: Weigh 17 parts of isophorone diisocyanate IPDI, 32 parts of polyethylene glycol PEG, 3.5 parts of dimethylol propionic acid DMPA, 3 parts of 1,4-butanediol BDO, and potassium hydroxide according to parts by weight 5 parts of KOH, 7 parts of N-methylpyrrolidone NMP, 8 parts of acetone, hydrogen peroxide H 2 o 2 70 parts, 0.1 part of butyltin dilaurate DBTDL;

[0048] Step 2, add IPDI and PEG to a four-necked flask with a reflux condenser, a thermometer and a stirring device, put the flask in a 90°C constant temperature water bath and stir for 2 hours, then add DBTDL to react for 20 minutes to make IPDI and PEG adequate response;

[0049] During the reaction process, use the di-n-butylamine titration method to detect the remaining amount of isocyanate group (-NCO) in the reaction solution, and start to cool down when the amount of -NCO in the sample reaches the theoretical value;

[0050] Step 3, after the temperature of the reaction solution is lowered to 55°C...

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Abstract

The invention discloses a waterborne polyurethane, comprising the following components in parts by weight: 10-17 parts of isophorone diisocyanate, 22-32 parts of polyethylene glycol, 0.5-3.5 parts of hydrophilic chain extender, 0.1-3 parts of 1,4-butanediol, 1-5 parts of potassium hydroxide, 4-7 parts of N-methyl pyrrolidone, 3-8 parts of acetone, 50-70 parts of hydrogen peroxide and 0.05-0.1 parts of dibutyltin dilaurate. According to the preparation method of the waterborne polyurethane disclosed by the invention, water is decomposed by adopting hydrogen peroxide in a reaction process while the traditional chain-extending emulsification and dispersion reaction on a waterborne polyurethane prepolymer by directly adding water are replaced, and the emulsification, chain extension, dispersion, and the like can be more evenly carried out, so that the waterborne polyurethane with balanced performance is obtained, and the problems of uneven emulsification and chain extension of water on the prepolymer, and poor overall performance of the waterborne polyurethane caused by over-large viscosity of the existing waterborne polyurethane prepolymer are solved.

Description

technical field [0001] The invention belongs to the technical field of organic polymer resin synthesis, and in particular relates to a water-based polyurethane, and also relates to a preparation method of the water-based polyurethane. Background technique [0002] Polyurethane is formed by addition polymerization of organic diisocyanate or polyisocyanate and dihydroxy or polyhydroxy compound. In addition to carbamate, polyurethane macromolecules can also contain ether, ester, urea, biuret, allophanate and other groups. According to the different raw materials used, there are different types of products, generally polyester type and polyether type. It can be used in the manufacture of plastics, rubber, fibers, rigid and flexible foams, adhesives and coatings, etc. Polyurethane is a new organic polymer material, known as the "fifth largest plastic", because of its excellent performance, it is widely used in construction, automobile, light industry, textile, petrochemical, me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/75C08G18/66C08G18/48C08G18/12
CPCC08G18/12C08G18/348C08G18/4833C08G18/6692C08G18/3206
Inventor 方长青周星程有亮于瑞恩
Owner 蚌埠金黄山凹版印刷有限公司
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