A kind of highly water-resistant and hydrophilic polyisocyanate curing agent and its preparation method and application

A polyisocyanate and hydrophilic technology, applied in the field of polymers, can solve the problems of poor dispersion of the system, insufficient hydrophilic ability of the trimer, and influence on the gloss and fullness of the paint film, and achieve high NCO content and excellent water resistance. , low viscosity effect

Active Publication Date: 2022-02-18
WANHUA CHEM GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since gloss fullness is a very important performance index in the field of metal anticorrosion, although the silicon-modified water-based isocyanate curing agent can improve the hardness and adhesion of the final paint film, but because the modified trimer has insufficient hydrophilic ability, only silicon-oxygen The hydrophilicity brought by alkane hydrolysis is far from enough to maintain the high-gloss and high-fullness system. The dispersion of the whole system is not good, and the gloss and fullness of the paint film will be greatly affected.

Method used

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  • A kind of highly water-resistant and hydrophilic polyisocyanate curing agent and its preparation method and application
  • A kind of highly water-resistant and hydrophilic polyisocyanate curing agent and its preparation method and application
  • A kind of highly water-resistant and hydrophilic polyisocyanate curing agent and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] The structural formula of the highly water-resistant and hydrophilic polyisocyanate curing agent of the present embodiment is as follows:

[0055]

[0056] Wherein, R is selected from methyl, Represent-CH 2 CH 2 CH 2 -.

[0057] Its preparation method includes the following steps: under the protection of nitrogen, add 1kg of butane sultone into the reaction vessel, slowly add 1kg of silane coupling agent KH540 under stirring at 60°C, then continue stirring for 10min, add 98kg of HDI trimer , heat up to 100°C, slowly add N,N-dimethylcyclohexylamine dropwise under stirring for 100% neutralization, keep at 100°C and continue the reaction until the NCO content is 21wt%-22wt%, to obtain high water resistance and hydrophilic type Polyisocyanate curing agent.

[0058] The IR spectrum of the HDI trimer is as follows figure 1 As shown, the IR spectrum of the highly water-resistant and hydrophilic polyisocyanate curing agent prepared in this embodiment is as follows: ...

Embodiment 2

[0061] The structural formula of the highly water-resistant and hydrophilic polyisocyanate curing agent of the present embodiment is as follows:

[0062]

[0063] Wherein, R is selected from ethyl, Represent-CH 2 CH 2 CH 2 -.

[0064] The difference between the preparation method of this example and Example 1 is that the silane coupling agent KH540 is replaced by KH550, and the rest of the raw materials and reaction conditions are the same as those of Example 1.

Embodiment 3-11

[0066] The difference between the preparation method of the highly water-resistant and hydrophilic polyisocyanate curing agent of Examples 3-11 and Example 1 is shown in Table 1.

[0067] The difference between the preparation method of table 1 embodiment 3-11 and embodiment 1

[0068]

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Abstract

The invention provides a highly water-resistant and hydrophilic polyisocyanate curing agent and its preparation method and application. The polyisocyanate curing agent has the following structural formula: the polyisocyanate curing agent has a higher NCO content, lower viscosity and excellent water resistance; it is prepared with acrylic dispersions of different hydroxyl values, and the appearance of the paint film, Water resistance and other performance tests show that the polyisocyanate curing agent not only maintains the high-gloss and high-transparency appearance characteristics of water-based curing agents, but also has water resistance and other properties comparable to solvent-based curing agents, and is especially suitable for the field of metal anti-corrosion.

Description

technical field [0001] The invention belongs to the field of macromolecules, and in particular relates to a highly water-resistant and hydrophilic polyisocyanate curing agent and its preparation method and application. Background technique [0002] In recent years, with the increasingly stringent environmental protection regulations, water-based coatings have been favored by the market because they can effectively reduce VOC emissions, and their advantages have become increasingly prominent. However, due to the gap between water-based coatings and solvent-based coatings in terms of construction, appearance, and especially water resistance, oil-based coatings still occupy the main market in many fields, and the oil-based two-component polyurethane system occupies the entire coating market. More than 60% of. Two-component polyurethane water-based paint is the best solution to replace oily two-component polyurethane system. At present, it has achieved most of the performance i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/79C09D175/04C09D5/08C08G18/62C07F7/18
CPCC08G18/775C08G18/778C09D175/04C09D5/08C08G18/6225C07F7/1804C07F7/1892
Inventor 武泰恒孙伟祖孙少文邓俊英孙家宽
Owner WANHUA CHEM GRP CO LTD
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