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High-temperature self-crosslinking waterborne polyurethane resin containing epoxy group as well as preparation method and application of high-temperature self-crosslinking waterborne polyurethane resin

A water-based polyurethane and epoxy group technology, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the problem of low introduction of epoxy groups and achieve the effect of improving performance

Pending Publication Date: 2022-04-26
YANCHENG INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The epoxy-modified polyurethane resins in the above two methods all use industrial-grade epoxy resin to directly react with polyurethane active chains. The rigidity of the A structure can improve the coating strength, but there are few reports on the introduction of epoxy groups into polyurethane chains without adding epoxy resin.

Method used

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  • High-temperature self-crosslinking waterborne polyurethane resin containing epoxy group as well as preparation method and application of high-temperature self-crosslinking waterborne polyurethane resin
  • High-temperature self-crosslinking waterborne polyurethane resin containing epoxy group as well as preparation method and application of high-temperature self-crosslinking waterborne polyurethane resin
  • High-temperature self-crosslinking waterborne polyurethane resin containing epoxy group as well as preparation method and application of high-temperature self-crosslinking waterborne polyurethane resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The following are expressed in parts by mass. Under the protection of nitrogen and mechanical stirring throughout the whole process, 16.0 parts of diethylene glycol diethyl ether and 11.0 parts of ethylene glycol diglycidyl ether were added to a four-necked flask and stirred evenly. Next, add 3.0 parts of diethylene glycol diethyl ether and 2.0 parts of N-methylethanolamine within 0.5 hours, after the heat preservation reaction for 0.4 hours, add 1.0 parts of formic acid within 0.2 hours, after heat preservation reaction for 0.5 hours, add 6.0 parts of Diethylene glycol diethyl ether and 15.0 parts of hexamethylene diisocyanate trimer were reacted at 45°C for 1.0h, and then 3.0 parts of polyethylene glycol 400 and 11.5 parts of polyethylene glycol monomer were added within 0.2h. Methyl ether 1500, heat preservation reaction at 75°C for 1.0h, then cool down, add 3.7 parts of 1,3-thiazoline-4-carboxylic acid within 0.5h under ice bath conditions, and heat preservation reac...

Embodiment 2

[0033] Under nitrogen protection and mechanical stirring, 17.0 parts of hexanediol dimethyl ester and 12.5 parts of 1,6-hexanediol diglycidyl ether were added to a four-necked flask and stirred evenly. Add 5.0 parts of hexanediol dimethyl ester and 2.8 parts of N-methylethanolamine, after the heat preservation reaction for 1.0h, add 1.4 parts of glacial acetic acid in 0.2h, after heat preservation reaction for 1.0h, add 5.0 parts of diethylene glycol Diethyl ether and 18.5 parts of isophorone diisocyanate trimer were incubated at 50°C for 1.5 hours, and then 5.0 parts of polyethylene glycol 600 and 10.0 parts of polyethylene glycol monomethyl ether 2000 were added within 0.5 hours. Cool down at 65°C for 1.5 hours, then add 2.5 parts of 1,3-thiazoline-4-carboxylic acid within 0.5 hours under ice bath conditions, and heat for 1.0 hours to obtain a It is a water-based polyurethane resin capable of self-crosslinking at high temperatures.

[0034] The storage time at room temperat...

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Abstract

The invention discloses high-temperature self-crosslinking waterborne polyurethane resin containing an epoxy group as well as a preparation method and application of the high-temperature self-crosslinking waterborne polyurethane resin. The preparation method comprises the following steps: reacting N-methylethanolamine with diglycidyl ether to generate a compound containing an epoxy group and a hydroxyl group, then neutralizing an alcohol amine structure in the compound with organic acid to obtain an intermediate containing the epoxy group and the hydroxyl group at the same time, then reacting the intermediate with an isocyanate tripolymer to obtain a branched polyurethane prepolymer, and finally, reacting the branched polyurethane prepolymer with an isocyanate trimer to obtain the branched polyurethane prepolymer. The preparation method comprises the following steps: preparing a prepolymer, performing chain extension on the prepolymer by using a hydrophilic chain extender, finally sealing residual NCO by using 1, 3-thiazoline-4-formic acid to obtain waterborne polyurethane resin containing epoxy groups and carboxyl groups on a molecular chain at the same time, and enabling the resin to be subjected to self-crosslinking film formation at high temperature by using the reaction activity of the epoxy groups and the carboxyl groups. The epoxy group content in the obtained resin is high, and the toughness and impact strength of a coating can be improved on the premise of ensuring the strength of the coating.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a high-temperature self-crosslinking waterborne polyurethane resin containing epoxy groups and a preparation method and application thereof. Background technique [0002] With the development of modern industry, it is not only necessary to take into account the performance of products, but also to strengthen the awareness of environmental protection. The environmentally friendly water-based polyurethane occupies an important position in this respect. Waterborne polyurethane has a wide range of applications in the fields of leather products, coatings and adhesives, and is gradually replacing the position of solvent-based products that are not environmentally friendly. [0003] Because of the high strength and high corrosion resistance of epoxy groups, researchers use epoxy groups to modify polyurethane. For example, Jia Yulin (Plastic Industry, 2020.48(4): ...

Claims

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Application Information

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IPC IPC(8): C08G18/66C08G18/48C08G18/32C08G18/83C09D175/08
CPCC08G18/6688C08G18/4833C08G18/3275C08G18/3206C08G18/83C09D175/08
Inventor 韦军周奔
Owner YANCHENG INST OF TECH
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