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Nonionic and anionic mixed waterborne polyurethane curing agent and preparation method thereof

An anionic modifier and water-based polyurethane technology, which is applied in the field of water-based polyurethane curing agent and its preparation, can solve the problems of water resistance decline, long drying time of coating film, effective curing agent-NCO percentage decrease, etc., and reach NCO content High, good resistance to yellowing, and the effect of improving hydrophilicity

Active Publication Date: 2016-08-03
广州嘉宝莉地坪材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Non-ionic modification generally uses polyether polyols for hydrophilic modification, but a large amount of polyether is required in the modification process to make the water-based polyurethane curing agent have better water dispersibility, which will not only cause the coating film to dry Long time, water resistance will decrease, and the percentage of effective -NCO in the curing agent will be greatly reduced

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A preparation method of nonionic and anionic mixed modified water-based polyurethane curing agent, comprising the following steps:

[0033] (1) In a tank equipped with a stirrer, a thermometer and a 2 In a protected, dry and clean 500mL four-neck flask, add 300g of HDI monomer, and add 12g of polyethylene glycol with a molecular weight of 400 at a stirring speed of 100r / min, heat to 60°C and keep it warm for 2 hours to obtain HDI and low Adducts of polymer polyols.

[0034] (2) Add 0.61g of 2-hydroxyethyltrimethylammonium chloride to the adduct obtained in step (1), keep warm at 70°C during the reaction, measure the NCO content in the reaction system every hour, when the NCO content reaches 36.8% , under the conditions of 160°C and 0.01 Torr, the unreacted HDI monomer was removed by thin film evaporation technology to obtain HDI prepolymer with low free monomer content.

[0035] (3) When the temperature of the HDI prepolymer obtained in step (2) drops to 60°C, add 24....

Embodiment 2

[0039] A preparation method of nonionic and anionic mixed modified water-based polyurethane curing agent, comprising the following steps:

[0040] (1) In a tank equipped with a stirrer, a thermometer and a 2 In a protected, dry and clean 500mL four-neck flask, add 300g of HDI monomer, and add 24g of polyethylene glycol with a molecular weight of 400 at a stirring speed of 100r / min, heat to 80°C and keep it warm for 2 hours to obtain HDI and low Adducts of polymer polyols.

[0041] (2) Add 0.88g of tetrabutylammonium bromide to the adduct obtained in step (1), keep it warm at 60°C, measure the NCO content in the reaction system every hour, and when the NCO content reaches 34.6%, at 170 Under the conditions of ℃ and 0.02 Torr, the unreacted HDI monomer is removed by thin film evaporation technology, and the HDI prepolymer with low free monomer content is obtained.

[0042] (3) When the temperature of the HDI prepolymer obtained in step (2) is lowered to 70°C, add 13.28g of DMP...

Embodiment 3

[0046] A preparation method of nonionic and anionic mixed modified water-based polyurethane curing agent, comprising the following steps:

[0047] (1) In a tank equipped with a stirrer, a thermometer and a 2 In a protected, dry and clean 500mL four-neck flask, add 300g of HDI monomer, and add 21g of polyethylene glycol with a molecular weight of 500 at a stirring speed of 100r / min, heat to 70°C and keep it warm for 3 hours to obtain HDI and low Adducts of polymer polyols.

[0048] (2) Add 0.9g of benzyltriethylammonium chloride to the adduct obtained in step (1), keep it warm at 70°C, measure the NCO content in the reaction system every hour, and when the NCO content reaches 35.9%, the Under the conditions of 150°C and 0.03 Torr, the unreacted HDI monomer is removed by thin film evaporation technology to obtain a HDI prepolymer with low free monomer content.

[0049] (3) When the temperature of the HDI prepolymer obtained in step (2) drops to 60°C, add 22.47g of DMPA, keep i...

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Abstract

The invention discloses a nonionic and anionic mixed waterborne polyurethane curing agent and a preparation method thereof. The method comprises the following steps of: adding oligomer polyols to an HDI monomer in the presence of nitrogen, stirring and heating the oligomer polyols and the HDI monomer to 60-80 DEG C, and carrying out heat preservation and reaction for 2-3 hours to obtain an additive product; adding a trimer catalyzer to the additive product, carrying out thermal reaction at 60-80 DEG C; when the NCO content reaches a target value, removing unreacted HDI monomer under the conditions of 150-180 DEG C and 0.01-0.05Torr to obtain an HDI prepolymer; cooling the obtained HDI prepolymer to 60-70 DEG C, adding an anion modifier and carrying out thermal reaction for 2-4 hours; and adding a neutralizer, reacting for 0.5-1 hour, cooling and discharging the product to obtain the waterborne polyurethane curing agent. The preparation method disclosed by the invention is simple; the obtained waterborne polyurethane curing agent is light in color, high in effective -NCO content, yellowing-resistant and good in storage stability.

Description

technical field [0001] The invention relates to the technical field of curing agents, in particular to a nonionic and anionic mixed modified water-based polyurethane curing agent and a preparation method thereof. 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 (VOC) 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/10C08G18/48C08G18/66C08G18/73C08G18/34
CPCC08G18/10C08G18/4825C08G18/4833C08G18/6692C08G18/73C08G18/348
Inventor 黄洪刘小敏曹树坤梁林姣
Owner 广州嘉宝莉地坪材料有限公司
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