Polyacrylate modified water-based enclosed isocyanate curing agent and preparation method thereof

A technology of blocked isocyanate and polyacrylate, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the problems of difficult isocyanate group movement, reduced curing efficiency, coating performance defects, etc., to achieve low cost and improved appearance , The effect of stable product quality
CN104130375AActive Publication Date: 2014-11-05CNOOC CHANGZHOU PAINT & COATINGS IND RES INST +2
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CNOOC CHANGZHOU PAINT & COATINGS IND RES INST
Publication Date
2014-11-05

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Abstract

The invention relates to a polyacrylate modified water-based enclosed isocyanate curing agent and a preparation method thereof. The curing agent is obtained by neutralizing and emulsifying a prepolymer formed by polyisocyanate semi-enclosed object and hydroxyl-containing polyacrylate, and the mole ratio of NCO to OH is 1-1.15:1. The hydroxyl-containing polyacrylate is prepared by: taking 10-50wt% of a solvent as the base material, and dripping a mixture composed of 5-15% of a carboxyl-containing vinyl monomer, 2-20% of a primary hydroxyl or secondary hydroxyl-containing acrylate monomer, 1-10% of a primary hydroxyl-containing epsilon-caprolactone modified vinyl monomer, 5-70% of other monomer containing a vinyl structure, 0.1-5% of a chain transfer agent and 0.05-3% of an initiator into the base material. The sealant and polyisocyanate for preparation of the polyisocyanate semi-enclosed object are in a mole ratio of 1.05-1.5:1. The curing agent has good miscibility with the matrix resin, high curing efficiency, low cost, flexibility and impact resistance.
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Description

technical field

[0001] The invention relates to a polyacrylate modified water-based blocked isocyanate curing agent and a preparation method thereof. Background technique

[0002] Waterborne polyurethane has been widely used in the fields of coatings, inks and adhesives due to its excellent comprehensive properties. Waterborne polyurethane is mainly divided into one-component and two-component systems. One-component water-based polyurethane is convenient for construction, but its chemical resistance is insufficient; two-component water-based polyurethane is generally composed of water-based hydroxyl-containing polyacrylate dispersion and water-based polyisocyanate curing agent. , excellent coating performance. However, the two-component water-based polyurethane needs to be prepared and used immediately when it is used, and there is a pot life, which is not conducive to construction. In order to solve the contradiction between the performance and workability of the two-com...

Claims

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