Long-activation-period water-based two-component polyurethane curing agent as well as preparation method and application thereof

A two-component polyurethane technology with long activation period, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve problems such as excessive steric hindrance and difficult reaction, slow down the reaction speed, increase activation time, and simple operation process Effect
CN112680087AInactive Publication Date: 2021-04-20SOUTH CHINA UNIV OF TECH +1
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
SOUTH CHINA UNIV OF TECH
Publication Date
2021-04-20
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a long-activation-period water-based two-component polyurethane curing agent as well as a preparation method and application thereof. The preparation method comprises the following steps: uniformly mixing monofunctional hydrophilic polyether and a diisocyanate monomer at room temperature, adding a catalyst, conducting heating to 50 DEG C and 90 DEG C, conducting reacting for 1-4h until the NCO content of the system reaches a theoretical value, adding a polymerization inhibitor, conducting cooling to room temperature, and conducting discharging, and adding a polyisocyanate curing agent accounting for 80-99.5% of the total mass of the raw materials into the obtained product to prepare the long-activation-period water-based two-component polyurethane curing agent. The non-ionic hydrophilic long-chain-containing isocyanate compound is introduced into the isocyanate curing agent and matched with the water-based hydroxyl resin for paint preparation, and the reaction speed of -NCO and -OH is reduced in the film forming process due to the shielding effect of a hydrophilic long chain, so that the activation time of paint preparation is prolonged, the gloss of a coating can be reduced, and the construction performance of the curing agent is improved.
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Description

technical field

[0001] The invention relates to a polyurethane curing agent, in particular to a water-based two-component polyurethane curing agent with a long activation period and a preparation method thereof. The water-based two-component polyurethane curing agent of the present invention is used to extend the activation period of the water-based two-component polyurethane coating and construction performance. Background technique

[0002] Waterborne two-component polyurethane coating has the characteristics of low film-forming temperature, strong adhesion, good abrasion resistance and good weather resistance. It is an environmentally friendly coating that can replace solvent-based two-component polyurethane coatings, and has gradually become a research hotspot today. . It is composed of water-based hydroxyl resin (A component) and water-based polyisocyanate curing agent (B component). Usually, the hydroxyl resin is very easy to cross-link with the isocyanate in the wate...

Claims

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