Water-soluble blocked polyurethane curing agent and preparation method and application thereof

A polyurethane curing agent, closed-type technology, applied in polyurea/polyurethane adhesives, polyurea/polyurethane coatings, adhesives, etc., can solve the problems of high product molecular weight, decreased effective functional group ratio of curing agent, low solid content, etc.
CN110423323AActive Publication Date: 2019-11-08FOSHAN JINGXIN HUIMING TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
FOSHAN JINGXIN HUIMING TECH CO LTD
Publication Date
2019-11-08

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Abstract

The invention discloses a water-soluble blocked polyurethane curing agent and a preparation method and application thereof. The preparation method comprises the following steps: partially blocking isocyanate, then reacting the partially blocked isocyanate with dihydroxymethylcarboxylic acid to form a product A, and then enclosing all the remaining -NCO in the product A to obtain the water-solubleblocked polyurethane curing agent. The blocked polyurethane curing agent of the invention is mainly composed of a trifunctional isocyanate prepolymer, and has the advantages of small molecular weight,high solid content, high NCO%, good water solubility and dissolvability in water at any ratio; and the curing agent is very convenient to use, is mainly used in combination with water-based resin forpreparation of water-based stoving varnish and water-based high-temperature adhesives, and has good application prospects in the coating of heat-sensitive materials.
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Description

technical field

[0001] The invention relates to a polyurethane curing agent, in particular to a water-soluble closed polyurethane curing agent and its preparation method and application. Background technique

[0002] With the continuous improvement of environmental protection regulations and law enforcement methods, high-pollution chemical companies are changing jobs, and the raw materials used are constantly changing from solvent-based to solvent-free and water-based. In recent years, the application range of water-based coatings and water-based adhesives has continued to expand, and the application of room-temperature curing materials has been popularized rapidly, but the application of high-temperature curing materials has not been smooth, mainly due to the water-based coatings and water-based high-temperature adhesives. There are few types of closed polyurethane curing agents, and the unblocking temperature is high and the scope of application is narrow. Tracing it to i...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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