High-solid self-healing waterborne polyurethane acrylate and preparation method thereof

A polyurethane acrylate and acrylate technology, applied in the field of waterborne polyurethane, can solve the problems of poor mechanical properties, narrow applicability, poor water resistance, etc., achieve good dynamic performance, improve low solid content, and automatically repair cracks and scratches.

Active Publication Date: 2022-03-01
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Water-based polyurethane has good aging resistance, wear resistance, and no release of organic solvents, but its mechanical properties are poor, water resistance is poor, solid content is low, and its applicability is narrow

Method used

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  • High-solid self-healing waterborne polyurethane acrylate and preparation method thereof
  • High-solid self-healing waterborne polyurethane acrylate and preparation method thereof
  • High-solid self-healing waterborne polyurethane acrylate and preparation method thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0022] The preparation method of the high-solid aqueous polyurethane acrylate dispersion that the present invention relates to comprises the following steps:

[0023] Step 1: Add diisocyanate and polyester polyol, or add diisocyanate and polyether polyol to a four-necked flask equipped with standard synthetic reaction equipment (thermometer, condenser, mechanical stirring device), and the added diisocyanate and The ratio of isocyanate group to hydroxyl substance in polyester polyol is 2.5~4:1, the ratio of isocyanate group to hydroxyl substance in added diisocyanate and polyether polyol is 2.5~4:1, and the temperature is raised to 70 ~90°C, react for 1~3h to obtain polyurethane prepolymer.

[0024] Step 2: adding a catalyst, the dosage of the catalyst is 1-2 drops. After adding a viscosity reducing solvent, a hydrophilic chain extender and a chain extender containing a disulfide bond, the first mixed solution is obtained after mixing and reacting. The first mixed solution inc...

Embodiment 1

[0038] Step 1: Add 5.55 g of isophorone diisocyanate and 20 g of polyester polyol into a three-necked flask equipped with a thermometer, a stirrer, and a glass bottle stopper, mix well, adjust the temperature of the magnetic stirrer to 80°C, and the stirring speed to 300rpm, fully react for 1h.

[0039] Step 2: Add 1-2 drops of dibutyltin dilaurate, add 0.7665g of acetone to the reaction, add 0.7665g of bismethylolpropionic acid, and 1.2775g of 2,2-dithiodiethanol in sequence. Adjust the reactant temperature to 75°C and react for 3h.

[0040] Step 3: Cool down to 50°C, add 1.2775g of hydroxyethyl acrylate, and react for 1h.

[0041] Step 4: Cool down to 30°C, add 0.5777g of triethylamine for neutralization, the neutralization time is 30min, then add 70.3g of water, adjust the stirring speed to 1500rpm, and react for 30min.

[0042] Step 5: Heat up to 50°C, add 18g of methyl methacrylate, 12g of butyl acrylate, 0.3753g of sodium dodecylsulfonate, 0.1877g of fatty alcohol poly...

Embodiment 2

[0047] Step 1: Add 6.66g of isophorone diisocyanate and 20g of polyether polyol into a three-necked flask equipped with a thermometer, a stirrer and a glass bottle stopper, mix well, adjust the temperature of the magnetic stirrer to 70°C, and the stirring speed to 300rpm, full reaction 2h.

[0048] Step 2: Add 1-2 drops of dioctyltin dilaurate, add 1.0664 g of butanone to the reaction, add 1.0664 g of bismethylol butyric acid, and 1.5996 g of TDS in sequence. Adjust the reactant temperature to 80°C and react for 3h.

[0049] Step 3: Cool down to 60°C, add 1.8662g of hydroxyethyl methacrylate, and react for 1 hour.

[0050] Step 4: Cool down to 30°C, add 0.8038g of triethylamine for neutralization, the neutralization time is 40min, then add 77.8g of water, adjust the stirring speed to 1500rpm, and react for 40min.

[0051] Step 5: Heat up to 50°C, add 25.92g of methyl acrylate, 12.96g of butyl acrylate, 0.5433g of sodium lauryl sulfate, 0.2716g of fatty alcohol polyoxyethylen...

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Abstract

The invention relates to the technical field of coating materials, and provides a method for preparing a high-solid waterborne polyurethane acrylate dispersion, comprising: reacting diisocyanate with polyester polyol or polyether polyol to obtain a polyurethane prepolymer; prepolymerizing the polyurethane The first mixed solution is obtained by mixing the first mixed solution with the viscosity reducing solvent, the hydrophilic chain extender and the dihydric alcohol chain extender containing the disulfide bond; the first mixed solution is mixed with the hydroxyl-containing acrylate monomer to obtain the bis A bond-terminated polyurethane prepolymer; add water to emulsify the double-bond-terminated polyurethane prepolymer, remove the solvent to obtain a second mixed solution, mix and emulsify the second mixed solution with an acrylic ester monomer, and then mix and react with the initiator solution. A high-solid waterborne polyurethane acrylate dispersion is prepared by the above method. When used as a coating film, a coating material with self-repairing performance is obtained by the above method. The coating material has good self-healing performance under the irradiation of visible light, ultraviolet light and suitable temperature.

Description

technical field [0001] The invention relates to the technical field of water-based polyurethane, in particular to a high-solid water-based polyurethane acrylate dispersion, a preparation method thereof, and a coating material with self-repairing properties. Background technique [0002] Water-based polyurethane has good aging resistance, wear resistance, and no release of organic solvents, but it has poor mechanical properties, poor water resistance, low solid content, and narrow applicability. Acrylate modified water-based polyurethane is a very effective method commonly used. Acrylic esters are added to water-based polyurethane emulsion to promote free radical emulsion polymerization through initiators to form a composite emulsion and form a core-shell structure. Polyurethane acrylate The composite emulsion can obtain high toughness, high hardness, and high elasticity coatings in a wide range by adjusting the formula, which can meet different needs. The crosslinking degree...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/75C08G18/67C08G18/42C08G18/48C08G18/10C08G18/34C08G18/32C08F283/06C08F220/14C08F220/18
CPCC08G18/755C08G18/672C08G18/42C08G18/48C08G18/10C08F283/065C08F220/14C08F220/1808C08G18/348C08G18/3855
Inventor 王学川王园园冯见艳
Owner SHAANXI UNIV OF SCI & TECH
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