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Aqueous polyurethane acrylate dispersion, preparation method thereof, and coating material with self repairing function

A technology of urethane acrylate and acrylate, which is applied in the field of coating materials, can solve problems affecting the appearance, scratches or cracks on the surface of objects, etc., and achieve the effect of automatic repair of cracks and scratches, good cracks and scratches, and good dynamic performance

Active Publication Date: 2019-07-05
SICHUAN DOWELL SCI & TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Polyurethane-acrylate composite materials can be used to coat the surface of objects to enhance the hardness of the surface of objects and prolong the service life of objects, but scratches or cracks will appear on the surface of objects after long-term use, which will affect the appearance

Method used

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  • Aqueous polyurethane acrylate dispersion, preparation method thereof, and coating material with self repairing function
  • Aqueous polyurethane acrylate dispersion, preparation method thereof, and coating material with self repairing function
  • Aqueous polyurethane acrylate dispersion, preparation method thereof, and coating material with self repairing function

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preparation example Construction

[0021] A preparation method of aqueous polyurethane acrylate dispersion, comprising:

[0022] S1. Preparation of polyurethane prepolymer: react diisocyanate with polyester polyol or polyether polyol to obtain polyurethane prepolymer. The ratio of the amount of substance is 8~11:1.

[0023] Specifically, add diisocyanate and polyester polyol, or add diisocyanate and polyether polyol in the reactor, the ratio of the amount of isocyanate group and hydroxyl substance in the added diisocyanate and polyester polyol is 8~11: 1. The ratio of the amount of diisocyanate and polyether polyol to the amount of isocyanate group to hydroxyl substance is 8 to 11:1, and the temperature of the reactor is raised to 60 to 90 ° C, and the reaction is performed for 0.5 to 2.5 hours to obtain a polyurethane prepolymer. It should be noted that, in the present invention, it is also possible to first make the reaction kettle warm up to the required temperature, and then add diisocyanate and polyester ...

Embodiment 1

[0061] This embodiment provides a water-based polyurethane acrylate dispersion, a preparation method thereof, and a finishing material with self-healing properties.

[0062] A kind of preparation method of aqueous polyurethane acrylate dispersion, concrete operation is as follows:

[0063] Add isophorone diisocyanate and polyadipate 1,4 butanediol polyester diol (molecular weight 1000) in the reactor, the added isophorone diisocyanate and polyadipate 1,4 butanediol The ratio of the amount of isocyanate group to hydroxyl substance in alcohol polyester diol (molecular weight 1000) is 8:1. Then raise the temperature of the reactor to 85° C., and react for 1.5 hours to obtain a polyurethane prepolymer.

[0064] With methanol as a solvent and sodium methoxide as a catalyst, mercaptoethanol (change mercaptoethanol to 3-mercapto-1-propanol, 4-mercapto-1-butanol to obtain the other two)) and 3-chloro-2- The molar ratio of chloromethyl-1-propylene is 2:1, and the mixture is reacted u...

Embodiment 2

[0073] This embodiment provides a water-based polyurethane acrylate dispersion, a preparation method thereof, and a finishing material with self-healing properties.

[0074] A kind of preparation method of aqueous polyurethane acrylate dispersion, concrete operation is as follows:

[0075] Add hexamethylene diisocyanate and polytetrahydrofuran diol into the reaction kettle, and the ratio of the amount of isocyanate group to hydroxyl substance in the added hexamethylene diisocyanate and polytetrahydrofuran diol is 11:1. Then raise the temperature of the reactor to 60° C., and react for 3.5 hours to obtain a polyurethane prepolymer.

[0076] Water tetrahydrofuran is used as a solvent, sodium hydride is used as a catalyst, dihydroxypropylene mercaptan and 3-chloro-2-chloromethyl-1-propene are mixed at a ratio of 2:1, and react at room temperature to obtain allylsulfide-containing The tetrahydroxy compound of ether group, the chemical formula of this tetrahydroxy compound is:

...

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Abstract

The invention relates to the technical field of coating materials, and provides a preparation method of an aqueous polyurethane acrylate dispersion. The preparation method comprises following steps: reacting diisocyanate with polyester polyol or polyether polyol to obtain a polyurethane prepolymer; mixing the polyurethane prepolymer with a viscosity reduced solvent, a hydrophilic chain extender, and a chain extender containing allyl thioether groups, carrying out reactions to obtain a first mixed solution; mixing the first mixed solution with hydroxyl containing acrylate monomers, carrying outreactions to obtain a double bond terminated polyurethane prepolymer; adding water into the double bond terminated polyurethane prepolymer, carrying out emulsification, removing the solvent, performing dilution until the solid content reaches 20 to 30% to obtain a second mixed solution; mixing the second mixed solution with acrylate monomers, carrying out emulsification, mixing the emulsion withan initiator solution, and carrying out reactions. The aqueous polyurethane acrylate dispersion is prepared by the method mentioned above. A coating material with a self repairing function comprises the aqueous polyurethane acrylate dispersion and a photo initiator. The coating material has a good self repairing performance under the irradiation of UV rays.

Description

technical field [0001] The invention relates to the technical field of finishing materials, in particular to a water-based polyurethane acrylate dispersion, a preparation method thereof, and a finishing material with self-repairing properties. Background technique [0002] Polyurethane has excellent mechanical properties, excellent cold resistance, wear resistance and elasticity, but its high temperature resistance, weather resistance and hydrolysis resistance are poor, and polyacrylate has good gloss, water resistance and outdoor aging resistance. characteristics, but high hardness, poor adhesion, and poor flexibility. Utilizing the complementary properties of polyurethane (PU) and polyacrylate (PA), the polyurethane resin can be modified by acrylate to obtain a polyurethane-acrylate composite material with excellent performance. Waterborne polyurethane acrylate is called the fourth generation of waterborne Polyurethane. [0003] Polyurethane-acrylate composite materials ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/75C08G18/73C08G18/76C08G18/67C08G18/42C08G18/48C08G18/44C08G18/32C08G18/10C09D175/14
CPCC08G18/10C08G18/4238C08G18/44C08G18/4825C08G18/4854C08G18/672C08G18/73C08G18/755C08G18/7614C08G18/7671C09D175/14C08G18/3868C08G18/348C08G18/3206C08G18/6659C08G18/6692
Inventor 邱武辉高圩杨斯盛蒲川山罗时海
Owner SICHUAN DOWELL SCI & TECH INC
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