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

Inactive Publication Date: 2021-04-20
SOUTH CHINA UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned technology uses 4-aminotoluene-2-sulfonic acid as a hydrophilic modifier, which has a group with too much

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0047]Example 1

[0048](1) Preparation of aqueous double-component polyurethane curing agent

[0049]The raw material components and dosage are as follows:

[0050]Table 1

[0051]

[0052]Preparation process: Under nitrogen protection, HDI, MPEG-400, and Dihuo acid dibutyltin were transferred to four round bottom flasks equipped with mechanical stirring, return tube, thermometer and nitrogen import and exit, and toned at 80 ° C to react 3H, when the NCO content of the system reached the theoretical value, the temperature was cooled to 50 ° C for 30 min, cooled to room temperature.

[0053](2) Formulation of two-component aqueous coatings: The components prepared above are uniformly mixed with Bayhydur XP 2487 in accordance with the mass of the water-based two-component polyurethane curing agent, and produce a long activation period aqueous bicomponent polyurethane. Hardener.

[0054]Waterborne polyurethane curing agent properties: solid content is 100%, viscosity (25 ° C) of 2000 MPa · S, NCO mass con...

Example Embodiment

[0067]Example 2

[0068](1) Preparation of aqueous double-component polyurethane curing agent

[0069]The raw material components and dosage are as follows:

[0070]table 3

[0071]

[0072]Preparation Process: Under nitrogen protection, TDI and MPEG-400 were transferred to four round bottom flasks equipped with mechanical stirring, return tube, thermometer and nitrogen anterior and outlet, and the mixture was tapered at 50 ° C for 2 h, to the system NCO content When the theoretical value is reached, it is charged for 30 min, cooled to room temperature.

[0073](2) Formulation of two-component aqueous coating: The components prepared above were uniformly mixed with Bayhydur XP 2487 with Bayhydur XP 2487 in accordance with the amount of water-based double-component polyurethane curing agent in the long activation period, and produced a waterborne bicomponent polyurethane. Hardener.

[0074]Waterborne polyurethane curing agent properties: solid content is 100%, viscosity (25 ° C) of 3800 MPa · S, NCO mass...

Example Embodiment

[0079]Example 3

[0080](1) Preparation of aqueous double-component polyurethane curing agent

[0081]The raw material components and dosage are as follows:

[0082]table 5

[0083]

[0084]Preparation Process: Under nitrogen protection, dibuti, MPEG-550, and Dihuoenic acid dibutyltin were transferred to four round bottom flasks equipped with mechanical stirring, return tube, thermometer and nitrogen import and export, and then raised to 80 ° C. When the reaction is 3 h, when the system NCO content reaches the theoretical value, it is 50 ° C for 30 min, cooled to room temperature.

[0085](2) Formulation of two-component aqueous coating: The components prepared above are mixed in accordance with the mass of the water-based double-component polyurethane curing agent in the long activation period and the Bayhydur XP 2655 mixed uniform, and the new long live water-based double component is obtained. Polyurethane curing agent.

[0086]Waterborne polyurethane curing agent properties: solid content is 100%, v...

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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.

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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Application Information

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IPC IPC(8): C09D175/08
Inventor 瞿金清韩凯郑佳蓉朱延安
Owner SOUTH CHINA UNIV OF TECH
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