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Method for preparing blocked polyurethane-epoxy resin composite emulsifier

A technology of epoxy resin and composite emulsion, which is applied in the field of coating science, can solve the problems of reducing emulsion stability, failing to meet anti-corrosion requirements, and limited amount of epoxy resin, so as to increase the amount of modification, improve the performance of anti-corrosion candles, reduce The effect of crosslink density

Inactive Publication Date: 2017-01-11
上海闵轩钢结构工程有限公司
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AI Technical Summary

Problems solved by technology

The amount of epoxy resin in the common polyurethane epoxy composite emulsion used for one-component coatings is limited, and the residual epoxy group in the emulsion reduces the stability of the emulsion, which cannot meet the high demand for anti-corrosion.

Method used

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  • Method for preparing blocked polyurethane-epoxy resin composite emulsifier

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Embodiment Construction

[0020] The specific implementation technical solutions of the present invention will be described in further detail below in conjunction with the examples.

[0021] A preparation method of closed polyurethane-epoxy resin composite emulsion, comprising the following steps:

[0022] 1) Ring opening of epoxy resin

[0023] Weigh 50g of bisphenol A type epoxy resin and dissolve it in a mixed solvent of N-methylpyrrolidone and acetone, add 11.04g of diethanolamine after complete dissolution, and react at 75-80°C for about 8 hours to cool and discharge;

[0024] 2) Synthesis of closed polyurethane-epoxy resin composite emulsion

[0025] Weigh 12g of toluene diisocyanate and 5.30g of polyether diol, react at 75°C until the -NCO value is close to the theoretical value, and then gradually add 1,4-butanediol, Dimethylolpropionic acid was reacted until the -NCO value was close to the theoretical value, and the end-NCO polyurethane prepolymer was prepared, and then the blocking agent me...

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Abstract

The invention discloses a method for preparing blocked polyurethane-epoxy resin composite emulsifier. The method includes the steps of ring opening of epoxy resin and synthesis of the blocked polyurethane-epoxy resin composite emulsifier. The use amount of epoxy resin is increased, so corrosion resistance of the emulsifier is greatly improved, and accordingly the composite emulsifier with good stability and excellent corrosion resistance is prepared.

Description

technical field [0001] The invention relates to the field of coating science and technology, in particular to a method for preparing a closed polyurethane-epoxy resin composite emulsion. Background technique [0002] As we all know, metal materials are widely used engineering materials. But these metallic materials contact with the corrosive medium in surrounding environment and corrosion reaction can take place, cause metal corrosion to take place every moment, bring huge loss to national economy. The economic loss caused by corrosion is of great significance to the development of the national economy. [0003] The coating protection of anti-corrosion coatings can not only protect metal products from corrosion, but also impart decorative properties such as color and gloss to metal products. It is one of the most widely used metal material protection methods at present. As relevant laws and regulations at home and abroad restrict volatile organic compounds (and harmful air...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/76C08G18/66C08G18/64C08G18/48C08G18/32C08G18/34C08G18/28C09D175/08C08G59/14
CPCC08G18/7614C08G18/286C08G18/4081C08G18/4825C08G18/643C08G18/6541C08G18/6692C08G59/1477C09D175/08
Inventor 夏学云
Owner 上海闵轩钢结构工程有限公司
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