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Non-ionic water-based blocked polyisocyanate curing agent and preparation method thereof, water-based coating

A polyisocyanate, non-ionic technology, applied in polyurea/polyurethane coatings, coatings, etc., can solve problems that do not conform to development trends, consume large energy, violate environmental protection requirements, etc., and achieve improved storage stability and low VOC content , the effect of high solid content

Active Publication Date: 2021-06-01
湖南湘江关西涂料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] CN107828049A discloses a kind of aziridine type water-based blocked polyisocyanate curing agent and its preparation method, and the blocking agent it uses is aziridine compound, and CN101896528A discloses blocked polyisocyanate and the urethane composition containing it, and CN1427859A Disclosed dimethylpyrazole-blocked isocyanate mixture, EP0159117A1 (Blocked Isocyanates) process is similar, it uses pyrazole-type blocking agent, the unblocking temperature of the above-mentioned blocking agent usually needs to be baked at a temperature above 140°C to unblock, and it needs to consume a lot of energy
[0010] CN1371397A discloses the HDI trimer blocked by IPDA and formaldehyde-stabilized malonate, although the invention uses malonate (active methylene blocking agent) to block the polyisocyanate trimer, but the resulting HDI trimer It is an oil-based curing agent, which is contrary to the national environmental protection requirements and does not conform to the future development trend

Method used

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  • Non-ionic water-based blocked polyisocyanate curing agent and preparation method thereof, water-based coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] (1) Put a long hydrophilic chain alcohol (polyethylene glycol monomethyl ether MPEG300) in a four-neck round bottom flask, insert a thermometer, then turn on the oil pump, and remove water under reduced pressure (negative pressure is 750mmHg, temperature is 99°C, The time is 4h), the water content of long hydrophilic chain alcohol (polyethylene glycol monomethyl ether MPEG300) is controlled at the end point to be 0.07%, and cooled to 40°C.

[0048] (2) Install a reflux condenser, a thermocouple, a thermometer, and a nitrogen tube on the above-mentioned four-necked round-bottom flask. Under stirring, add ethyl acetate and HDI monomeric polyisocyanate, and blow in nitrogen at the same time, disperse for 15 minutes, and then Raise the temperature to 95°C, stop blowing nitrogen, react for 2 hours, add a short hydrophilic chain alcohol (dipropylene glycol monomethyl ether), react for 2 hours, add a short hydrophobic chain alcohol (isopropanol), and react for 2 hours.

[0049...

Embodiment 2

[0053] (1) Put a long hydrophilic chain alcohol (polyethylene glycol monomethyl ether MPEG600) in a four-neck round bottom flask, insert a thermometer, then turn on the oil pump, and remove water under reduced pressure (negative pressure is 760mmHg, temperature is 105°C, The time is 3h), the water content of long hydrophilic chain alcohol (polyethylene glycol monomethyl ether MPEG600) is controlled at the end point to be 0.05%, and cooled to 40°C.

[0054] (2) Install a reflux condenser, a thermocouple, a thermometer, and a nitrogen tube on the above-mentioned four-necked round-bottom flask. Under stirring, add ethyl acetate and HDI trimer polyisocyanate, and blow in nitrogen at the same time, and disperse for 15 minutes. Then heat up to 95°C, stop blowing nitrogen, react for 1.5h, add short hydrophilic chain alcohol (tripropylene glycol monomethyl ether), react for 1.5h, add short hydrophobic chain alcohol (octacarbon alcohol), react for 1.5h.

[0055] (3) Pre-disperse alkali...

Embodiment 3

[0059] (1) Put a long hydrophilic chain alcohol (polyethylene glycol monomethyl ether MPEG1000) in a four-neck round bottom flask, insert a thermometer, then turn on the oil pump, and remove water under reduced pressure (negative pressure is 755mmHg, temperature is 100°C, The time is 3.5h), the water content of long hydrophilic chain alcohol (polyethylene glycol monomethyl ether MPEG1000) is controlled at the end point to be 0.06%, and cooled to 40°C.

[0060] (2) Install a reflux condenser, a thermocouple, a thermometer, and a nitrogen tube on the above-mentioned four-necked round-bottomed flask. Under stirring, add ethyl acetate and IPDI monomer, and blow in nitrogen at the same time, disperse for 15 minutes, and then heat up to 95°C, stop blowing nitrogen, react for 2.5h, add short hydrophilic chain alcohol (diethylene glycol monomethyl ether), react for 2.5h, add short hydrophobic chain alcohol (methyl isobutyl carbinol), react for 2.5h.

[0061] (3) Alkali metal salts of ...

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Abstract

A nonionic water-based blocked polyisocyanate curing agent, a preparation method thereof, and a water-based paint. The curing agent contains the following raw materials: polyisocyanate compounds, long hydrophilic chain alcohols, optional short hydrophilic chain alcohols, optional short hydrophobic chain alcohols, active methylene blocking agents, cosolvents, alkali metal salts of alcohols, Neutralizing agent; the long hydrophilic chain alcohol is selected from at least one polyether monoalcohol with a molecular weight of 300-2000; at least one of the polyether monoalcohols with a molecular weight of 120-300 as the short hydrophilic chain alcohol, The short hydrophobic chain alcohol is selected from at least one of 4-10 carbon saturated monohydric fatty alkanols, and the present invention also includes a preparation method of a nonionic water-based blocked polyisocyanate curing agent and a water-based coating containing the curing agent. Compared with the prior art, the curing agent of the present invention has a high solid content, no volatile NCO, has a low VOC content, and can be stably dispersed in the coating solution, thereby effectively improving the storage stability of the coating. Simple process.

Description

technical field [0001] The invention relates to the field of polyisocyanate curing agents, in particular to a nonionic water-based blocked polyisocyanate curing agent, a preparation method thereof, and a water-based coating. Background technique [0002] With the development of the domestic paint industry and the country's increasingly stringent requirements for environmental protection and energy, it is imperative to carry out water-based changes in the paint and coating industry. Water-based paint is an important development direction in the future (CN105669946A, a polyether modified The preparation method of HMDI waterborne polyurethane curing agent). Water-based polyurethane curing agent is a curing material widely used in water-based coatings. It is characterized by low VOC emissions and is an environmentally friendly material. The water-based blocked polyisocyanate curing agent is a relatively common type of water-based polyurethane curing agent. Usually, the blocking...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/78C09D175/04
CPCC08G18/7843C09D175/04
Inventor 喻佳杨鹏飞张杰胡启明黄鹂
Owner 湖南湘江关西涂料有限公司