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Production method of water-based polyurethane curing agent

A water-based polyurethane and curing agent technology, applied in polyurea/polyurethane coatings, coatings, etc., can solve the problems of high viscosity of curing agent system, slow drying speed of coating film, poor water resistance, etc., and achieve good yellowing resistance, excellent Good mechanical properties and water dispersion stability

Pending Publication Date: 2019-11-05
黄兰英
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem that the present invention mainly solves is that in order to obtain good water dispersibility for existing polyurethane curing agents, they all add a large amount of polyether in the system, and the obtained curing agent system has high viscosity, low NCO content, and too much The introduction of hydrophilic polyether soft segment also leads to the defects of slow drying speed and poor water resistance of the coating film, and a preparation method of water-based polyurethane curing agent is provided

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Preparation of long-chain aliphatic isocyanates:

[0031] Add 70mL of castor oil, 4g of sodium methoxide, and 5mL of triethanolamine into a three-necked flask equipped with a dropping funnel and a condensing device, heat up to 50°C, start the stirrer to stir and mix at a speed of 200r / min, and then add 40mL glycerin, heat preservation and stirring reaction for 3h, to obtain alcoholyzed castor oil;

[0032] In parts by weight, 70 parts of hexamethylene diisocyanate was added to the above three-necked flask, and the reaction was continued for 2 hours. After the temperature of the three-necked flask was lowered to 50°C, 20 parts of glycerin, 10 parts of diethyl phosphate and 20 parts of horseradish were sequentially added to the three-necked flask. To acid anhydride, dissolve 3 parts of dibutyltin dilaurate in 35 parts of acetone and pour it into a constant pressure dropping funnel, drop it into a three-necked flask at a dropping rate of 2 mL / min, raise the temperature whi...

Embodiment 2

[0040] Preparation of long-chain aliphatic isocyanates:

[0041] Add 75mL of castor oil, 4g of sodium methoxide, and 6mL of triethanolamine into a three-necked flask with a dropping funnel and a condensing device, heat up to 55°C, start the stirrer to stir and mix at a speed of 250r / min, and then add 45mL glycerin, heat preservation and stirring reaction for 3.5h to obtain alcoholyzed castor oil;

[0042] In parts by weight, 75 parts of hexamethylene diisocyanate was added to the above three-necked flask, and the reaction was continued for 2.5 hours. After the temperature of the three-necked flask was lowered to 55°C, 25 parts of glycerin, 12 parts of diethyl phosphate and 22 parts of Maleic anhydride, after dissolving 4 parts of dibutyltin dilaurate in 37 parts of acetone, pour it into the constant pressure dropping funnel, drop it in the three-necked flask with a dropping rate of 2mL / min, raise the temperature while adding, control the heating rate as 4°C / min, the temperatu...

Embodiment 3

[0050] Preparation of long-chain aliphatic isocyanates:

[0051] Add 80mL of castor oil, 5g of sodium methoxide, and 7mL of triethanolamine into a three-necked flask equipped with a dropping funnel and a condensing device, heat up to 60°C, start the stirrer to stir and mix at a speed of 300r / min, and then add 50mL of glycerin, insulated and stirred for 4h to obtain alcoholylated castor oil;

[0052] In parts by weight, add 80 parts of hexamethylene diisocyanate into the above-mentioned three-necked flask, continue to react for 3 hours, wait for the temperature of the three-necked flask to drop to 60°C, then add 30 parts of glycerin, 15 parts of diethyl phosphate and 25 parts of horseradish to the three-necked flask successively. To acid anhydride, dissolve 5 parts of dibutyltin dilaurate in 40 parts of acetone and pour it into a constant pressure dropping funnel, drop it into a three-necked flask at a dropping rate of 3 mL / min, raise the temperature while adding, and control t...

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Abstract

The invention discloses a production method of a water-based polyurethane curing agent, and belongs to the technical field of production of chemical materials. In the polyurethane curing agent produced through the production method of the water-based polyurethane curing agent, long-chain aliphatic isocyanate is an HDI curing agent, and has a methylene long chain with good flexibility, thus polyurethane produced from the long-chain aliphatic isocyanate has excellent mechanical performance, strong-polarity groups, such as polyether chain segments, in amino resin and polyurethane in the polyurethane curing agent can be subjected to a local esterification reaction and then high-density cross-linking to form a double-layer net structure, thus the water resistance of the polyurethane is improved, essence oil in oi absorbing rubber powder has ultrahigh volatility, and the essence oil can slowly volatilize and be released from microcapsules by means of heating curing, and then is subjected tomicroemulsion in a water phase of the polyurethane curing agent, so that water droplets become smaller, solvent evaporation is facilitated, and curing and film forming are fast conducted.

Description

technical field [0001] The invention discloses a preparation method of a water-based polyurethane curing agent, which belongs to the technical field of chemical material preparation. Background technique [0002] Traditional polyurethane coatings are usually solvent-based and contain a large amount of volatile organic solvents, which release a large amount of harmful volatile organic compounds during production and use. With the restrictions on VOC in various countries' environmental protection laws and the continuous enhancement of people's environmental awareness, the development and application of environmentally friendly polyurethane coatings have gradually attracted people's attention. Water-based polyurethane coatings use water as the basic medium, and have the advantages of non-toxicity, non-flammability, energy saving, low VOC content and other environmental protection advantages. They are gradually being widely used in many fields as a substitute for solvent-based p...

Claims

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Application Information

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IPC IPC(8): C08G18/79C08G18/81C08G18/65C08G18/61C08G18/54C08G18/36C08G18/32C08G18/34C09D175/14
CPCC08G18/3206C08G18/3281C08G18/341C08G18/36C08G18/4027C08G18/544C08G18/61C08G18/6535C08G18/792C08G18/8125C09D175/14
Inventor 黄兰英
Owner 黄兰英
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