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Curing agent for water-based resin and preparation method thereof

A water-based resin and curing agent technology, used in coatings, polyurea/polyurethane coatings, etc., can solve the problems of short pot life of two-component polyurethane coatings, and achieve the effect of improved mechanical properties and convenient use.

Inactive Publication Date: 2019-06-28
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the application, it can be used with water-based acrylic, water-based polyester and other products to prepare a one-component baking coating system, which solves the defect of short pot life of two-component polyurethane coatings, and is easy to use

Method used

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  • Curing agent for water-based resin and preparation method thereof
  • Curing agent for water-based resin and preparation method thereof
  • Curing agent for water-based resin and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A curing agent for water-based resin, calculated in parts by weight, its preparation raw materials include:

[0037]

[0038] The raw materials for the preparation of the above-mentioned dihydroxyl fluorine-containing compound include: hexafluoroisopropanol, isophorone diisocyanate, trimethylolpropane, solvent and catalyst in a weight ratio of 100:100:60:10:0.01, wherein, The solvent is acetone; the catalyst is dibutyltin dilaurate.

[0039] The preparation method of above-mentioned a kind of water-based resin curing agent, the steps are as follows:

[0040] 1) Add hexafluoroisopropanol, isophorone diisocyanate, and the catalyst into the four-necked flask in sequence, raise the temperature to 30°C, and add the solvent into the four-necked flask at a rate of 0.05ml / s in proportion, React for 1 hour under stirring, then add trimethylolpropane in proportion, raise the temperature to 70°C, and react for 5 hours under stirring to obtain the dihydroxyl fluorine-containing...

Embodiment 2

[0053] A curing agent for water-based resin, calculated in parts by weight, its preparation raw materials include:

[0054]

[0055] The raw materials for the preparation of the above-mentioned dihydroxyl fluorine-containing compound include: hexafluoroisopropanol, isophorone diisocyanate, trimethylolpropane, solvent and catalyst in a weight ratio of 200:200:100:100:0.02, wherein, The solvent is a mixture of acetone and ethyl acetate at a volume ratio of 1:1; the catalyst is dibutyltin dilaurate.

[0056] The preparation method of above-mentioned a kind of water-based resin curing agent, the steps are as follows:

[0057] 1) Add hexafluoroisopropanol, isophorone diisocyanate, and the catalyst to the four-necked flask in sequence, raise the temperature to 50°C, and add the solvent to the four-necked flask at a rate of 0.1ml / s in proportion, React for 1 hour under stirring, then add trimethylolpropane in proportion, raise the temperature to 90°C, and react for 1 hour under s...

Embodiment 3

[0064] A curing agent for water-based resin, calculated in parts by weight, its preparation raw materials include:

[0065]

[0066] The raw materials for the preparation of the above-mentioned dihydroxyl fluorine-containing compound include: hexafluoroisopropanol, isophorone diisocyanate, trimethylolpropane, solvent and catalyst in a weight ratio of 150:150:80:30:0.015, wherein, The solvent is ethyl acetate; the catalyst is dibutyltin dilaurate.

[0067] The preparation method of above-mentioned a kind of water-based resin curing agent, the steps are as follows:

[0068] 1) Add hexafluoroisopropanol, isophorone diisocyanate, and the catalyst into the four-necked flask in sequence, raise the temperature to 35°C, and add the solvent into the four-necked flask at a rate of 0.08ml / s in proportion, React for 2 hours under stirring, then add trimethylolpropane in proportion, raise the temperature to 80°C, and react for 2 hours under stirring to obtain the dihydroxyl fluorine-co...

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Abstract

The invention provides a curing agent for water-based resin and a preparation method thereof. The curing agent is characterized by being prepared from the following raw materials in parts by weight: 10-60 parts of isophorone diisocyanate, 2.7-10 parts of dimethylolpropionic acid, 10-20 parts of dihydroxy fluorinated compound, 5-10 parts of triethylamine, 10-20 parts of 2-methylimidazole, 10-50 parts of butanone and 100-260 parts of deionized water, wherein the dihydroxy fluorinated compound is prepared from hexafluoroisopropanol, isophorone diisocyanate, trimethylolpropane, solvent and catalyst in a weight ratio of (100-200):(100-200):(60-100):(10-100):(0.01-0.02); the solvent is one or mixture of more than two of acetone and ethyl acetate, and the catalyst is dibutyltin dilaurate. The curing agent can be used for preparing films with excellent lyophobic effect, and can be widely applied to protection of airplanes, ships, construction, traffic and various mechanical equipment.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a curing agent for water-based resin and a preparation method thereof. Background technique [0002] Blocked water-based isocyanate is a compound with a relatively weak bond formed by the reaction of isocyanate dispersible in water and a blocking agent. The blocked isocyanate will undergo an unblocking reaction at a certain temperature and regenerate a compound that can be dispersed in water. The isocyanate curing agent, the unblocked isocyanate can react with the active hydrogen component in the formula to form multiple macromolecular structures containing carbamate, and complete the preparation of water-based polyurethane, so the blocked water-based isocyanate It is a good one-component water-based polyurethane curing agent. At present, although there are many ways to prepare a variety of blocked water-based isocyanate curing agents, in addition to the de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/75C08G18/34C08G18/32C09D175/04
Inventor 张英强单昌礼娄静洁李美佳李烨
Owner SHANGHAI INST OF TECH
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