Waterborne polyurethane as well as preparation method and application thereof

A water-based polyurethane and amino technology, used in polyurea/polyurethane coatings, antifouling/underwater coatings, coatings, etc., can solve the problems of air pollution, neutralizer toxicity, human harm, etc., and achieve excellent flexibility, biological Good compatibility and the effect of broadening the application field

Active Publication Date: 2019-10-01
SOUTH CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The volatilization of commonly used neutralizers will cause air pollution, and the volatilized neutralizers during the preparation and use are harmful to the human body
At present, there are few patents for preparing water-based polyurethane with different acids, and there is no amino acid as a neutralizing agent. For example, the Chinese invention patent with the patent number CN201710241126 uses one or more of lactic acid, glycolic acid, acetic acid and acetic anhydride as neutralizing agent agent, the Chinese invention patent with publication number CN106750118 A has invented a kind of water-based polyurethane preparation method using trifluoroacetic acid, trichloroacetic acid, acetic acid or hydrochloric acid as neutralizing agent. Although the above two invention patents have successfully prepared stable water-based polyurethane Polyurethane is expected to replace traditional neutralizers, but neutralizers still have certain toxicity

Method used

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  • Waterborne polyurethane as well as preparation method and application thereof
  • Waterborne polyurethane as well as preparation method and application thereof
  • Waterborne polyurethane as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Take 300 parts of castor oil (hydroxyl value 164 mg KOH / g) and 195 parts of IPDI, stir in an oil bath at 50 °C at 100 r / min for 10 min, add 0.35 parts of DBTDL, continue stirring and reacting in an oil bath at 50 °C for 1 h, add 50 1 part of MDEA continued to react. When the viscosity of the solution increased to the point where it could hardly flow, add 800 parts of MEK, and continue to stir and react at 50°C for 1 hour. The reaction system became clear and transparent. Stop heating. After reaching 300 r / min, add 2500 parts of 30 ℃ aqueous solution in which 38 parts of glutamic acid was dissolved, continue to stir for 5 min under ice bath, remove the ice bath, and continue to stir for 1 h; the product is rotary evaporated to obtain a cationic water-based polyurethane emulsion.

Embodiment 2

[0040] Take 300 parts of modified castor oil (hydroxyl value 208 mg KOH / g) and 250 parts of IPDI, stir in an oil bath at 50 °C at 100 r / min for 10 min, add 0.35 parts of DBTDL, and continue stirring and reacting in an oil bath at 50 °C for 1 h , add 65 parts of MDEA to continue the reaction, when the viscosity of the solution increases to almost flow, add 1000 parts of MEK, continue to stir and react at 50 ℃ for 1h, the reaction system becomes clear and transparent, stop heating, wait for the solution to cool to room temperature , after the rotation speed was adjusted to 300 r / min, add 3000 parts of 30 ℃ aqueous solution in which 48 parts of glutamic acid was dissolved, continue to stir for 5 min under ice bath, remove the ice bath, and continue to stir for 1 h; the product was rotary evaporated to obtain cationic water-based polyurethane emulsion.

Embodiment 3

[0042] Take 300 parts of castor oil (hydroxyl value 164 mg KOH / g) and 195 parts of IPDI, stir in an oil bath at 50 °C at 100 r / min for 10 min, add 0.35 parts of DBTDL, continue stirring and reacting in an oil bath at 50 °C for 1 h, add 50 1 part of MDEA continued to react. When the viscosity of the solution increased to the point where it could hardly flow, add 800 parts of MEK, and continue to stir and react at 50°C for 1 hour. The reaction system became clear and transparent. Stop heating. After reaching 300 r / min, add 2500 parts of 30 ℃ aqueous solution dissolved with 38 parts of aspartic acid, continue to stir for 5 min under ice bath, remove the ice bath, and continue to stir for 1 h; the product is rotary evaporated to obtain cationic water-based polyurethane emulsion .

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Abstract

The invention relates to the field of a high molecular material, in particular to waterborne polyurethane as well as a preparation method and application thereof. The waterborne polyurethane is prepared from the following ingredients in parts by weight: 30 to 200 parts of hydrophilic chain-extending agents, 100 to 500 parts of polyhydric alcohols, 40 to 400 parts of polyisocyanates, 0.25 to 3.4 parts of catalysts, 250 to 1000 parts of organic solvents, 500 to 3000 parts of water and 10 to 100 parts of neutralizers, wherein the neutralizers are amino acid and amino acid derivatives. The amino acid and amino acid derivatives are used as neutralizers; the positive effect is achieved on reducing or replacing the environment problems due to the use of hydrochloric acid, triethylamine, ammoniumhydroxide and the like as the neutralizers. The amino acid has good biocompatibility; the application field of the waterborne polyurethane, such as the fields of medicine carriers, heart stents and cosmetics is further expanded. In addition, more excellent performance is given to the waterborne polyurethane through the performance such as crystallization of the amino acid.

Description

technical field [0001] The invention relates to the field of polymer materials, in particular to a water-based polyurethane and its preparation method and application. Background technique [0002] Polyurethane coatings have broad application prospects and are widely used as wood coatings, leather coatings, architectural coatings, automotive coatings, plastic coatings, industrial coatings and corrosion protection coatings to meet different performance requirements. At present, with the improvement of people's environmental protection requirements and the introduction of the country's most stringent environmental protection laws and regulations in 2015, many companies are facing transformation or reform. Traditional solvent-based products can no longer meet the needs of environmental protection. The development of water-based products is the general trend. [0003] Compared with traditional solvent-based polyurethane, water-based polyurethane uses water as the dispersion medi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/36C08G18/32C08G18/48C08G18/44C08G18/66C08G18/38C09D175/14C09D175/04C09D175/06C09D175/08C09D5/08C09D5/14
CPCC08G18/3275C08G18/36C08G18/3819C08G18/4825C08G18/6655C08G18/6666C09D5/08C09D5/14C09D175/04C09D175/06C09D175/08C09D175/14
Inventor 张超群梁海燕欧荣贤王清文
Owner SOUTH CHINA AGRI UNIV
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