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Nanomaterial modified water-based polyisocyanate curing agent and its preparation and application

A technology of polyisocyanate and nanomaterials, which can be applied in biocide-containing paints, antifouling/underwater coatings, polyurea/polyurethane coatings, etc., and can solve problems such as low NCO content, poor medium resistance, and poor appearance of coating films , to achieve the effect of improving the drying speed, excellent matching, and overcoming the slow drying speed

Active Publication Date: 2021-10-26
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the existing water-based polyisocyanate curing agents in the market generally have the disadvantages of low NCO content, high viscosity, and poor dispersibility.
It has poor compatibility with hydroxyl resin, poor appearance of coating film, poor medium resistance, low gloss and low hardness

Method used

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  • Nanomaterial modified water-based polyisocyanate curing agent and its preparation and application
  • Nanomaterial modified water-based polyisocyanate curing agent and its preparation and application
  • Nanomaterial modified water-based polyisocyanate curing agent and its preparation and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Preparation of nano-material modified polyisocyanate curing agent, each raw material component and consumption are as follows in Table 1:

[0032] Table 1

[0033]

[0034] Preparation process: under the protection of nitrogen, add 88 parts of hexamethylene diisocyanate trimer and 4.5 parts of nano-nickel oxide to the reaction kettle, ultrasonically disperse for 20-60 minutes, heat up to 50°C, add 0.3 parts of dibutyltin maleate to react for 6 hours, Add 4.7 parts of 3,3-iminobis-1-propanesulfonic acid, drop 2 parts of triethylamine, raise the temperature to 80°C, react for 4 hours until the NCO content of the system reaches the theoretical value, add 0.5 parts of polymerization inhibitor p-toluene Methyl sulfonate terminates the reaction to obtain a nano-material modified water-based polyisocyanate curing agent.

[0035] (2) Performance of nano-material modified water-based polyisocyanate curing agent: a colorless transparent viscous liquid with a viscosity (25...

Embodiment 2

[0042] (1) Preparation and preparation of nano-material modified polyisocyanate curing agent, each raw material and consumption are as follows in Table 3:

[0043] table 3

[0044]

[0045]

[0046] Preparation process: under the protection of nitrogen, add 44 parts of hexamethylene diisocyanate trimer, 45 parts of isophorone diisocyanate trimer, 4.5 parts of nano-cadmium oxide into the reaction kettle, ultrasonically disperse for 60 minutes, heat up to 90 ° C, add 0.3 parts of dibutyltin dilaurate were reacted for 3 hours, 3.7 parts of 3-[(2-sulfoethyl)amino]-1-propanesulfonic acid were added, 2 parts of N,N-dimethylcyclohexylamine were added dropwise, and the temperature was raised to 115°C, react for 8 hours until the NCO content of the system reaches the theoretical value, add 0.5 part of polymerization inhibitor hydroquinone to terminate the reaction, and obtain the nano-material modified water-based polyisocyanate curing agent.

[0047] (2) Properties of nano-mate...

Embodiment 3

[0054] (1) Preparation of nano-material modified water-based polyisocyanate curing agent, each raw material and consumption are as follows in Table 5:

[0055] table 5

[0056]

[0057] Preparation process: under the protection of nitrogen, add 30 parts of toluene diisocyanate trimer, 59 parts of isophorone diisocyanate trimer, 4.5 parts of nano-silver oxide into the reaction kettle, ultrasonically disperse for 30 minutes, heat up to 80 ° C, add React 0.3 parts of stannous octoate for 5 hours, add 3.7 parts of 1,2-propanediol-3-sulfonic acid, add dropwise 2 parts of N,N-dimethylbutylamine, raise the temperature to 100°C, and react for 5 hours until the NCO content of the system reaches the theoretical level value, add 0.5 parts of polymerization inhibitor dimethyl sulfate to terminate the reaction, and obtain the nano-material modified water-based polyisocyanate curing agent.

[0058] (2) Performance of nano-material modified water-based polyisocyanate curing agent: a colo...

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Abstract

The invention belongs to the field of coating curing agents and discloses a nano-material modified water-based polyisocyanate curing agent as well as its preparation and application. Under the protection of nitrogen, add polyisocyanate and nano-metal oxides into the reactor, heat up to 50-90°C after ultrasonic dispersion, add catalyst to react for 3-6 hours, then add sulfonic acid and drop neutralizer, and heat up to 80-90°C React at 120°C for 4-8 hours. After the reaction is completed, add a polymerization inhibitor to terminate the reaction, and obtain a nanomaterial-modified water-based polyisocyanate curing agent. The invention speeds up the curing rate of the two-component waterborne polyurethane coating film through modification, and at the same time improves the hardness and medium resistance performance. Compared with the ordinary two-component waterborne polyurethane coating, the two-component waterborne polyurethane coating prepared by the modified curing agent has a pot life Long, high film hardness, fast drying, better medium resistance, antibacterial and anti-aging functions.

Description

technical field [0001] The invention belongs to the field of coating curing agents, and in particular relates to a nano-material modified water-based polyisocyanate curing agent and its preparation and application. Background technique [0002] With the increasingly stringent environmental regulations, high-performance, non-polluting, cross-linked water-based coatings have been rapidly developed, and two-component water-based polyurethane coatings have gradually become a research hotspot due to their excellent coating performance and low VOC content. . Two-component waterborne polyurethane coatings are composed of waterborne hydroxyl resin and waterborne polyisocyanate curing agent, among which the performance of waterborne polyisocyanate curing agent is very important. Its hydrophilicity, storage stability and compatibility with waterborne hydroxyl groups determine the performance and application of two-component waterborne polyurethane coatings. Although the traditional ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D175/04C09D5/14C09D7/62C08G18/73C08G18/75C08G18/76C08G18/79
CPCC08G18/724C08G18/73C08G18/755C08G18/7614C08G18/792C08G18/794C08K2003/2241C08K2003/2286C08K2201/011C09D5/14C09D175/04C09D7/62C09D7/67C08K9/04C08K3/22
Inventor 瞿金清罗顺伟朱祖欢夏伟林汉轩
Owner SOUTH CHINA UNIV OF TECH
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