Aqueous stone-chip-resistant polyurethane dispersion body and preparation method thereof

A technology of polyurethane dispersion and anti-stone impact, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the problems of no correlation and different technical fields, achieve simple lines, low VOC content, and realize large-scale industrial production Effect

Inactive Publication Date: 2019-04-16
湖南湘江关西涂料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There are many other patents related to the synthesis of waterborne polyur

Method used

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  • Aqueous stone-chip-resistant polyurethane dispersion body and preparation method thereof
  • Aqueous stone-chip-resistant polyurethane dispersion body and preparation method thereof
  • Aqueous stone-chip-resistant polyurethane dispersion body and preparation method thereof

Examples

Experimental program
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Example Embodiment

[0046] 3. Resin Example 1:

[0047] In the reactor, 92g of polycarbonate diol (Mn=3000) compound was dewatered at 105°C for 2 hours under negative pressure of -0.09MPa, and the water content was confirmed to be 0.02%; then 28g of isophorone diisocyanate Add, pre-react at 70℃ for 30min, then add 0.08g of catalyst, and react for 2 hours to reach the set NCO value of 7.94~7.74%; then add 7.2g of dimethylolpropionic acid and continue the reaction at 80℃ After 4 hours, reach the set NCO value of 5.83~5.53%; then add 20g of hexanediol and continue to react at 85℃ for 0.5 hours to reach the set NCO value of 1.80~1.55%; then dissolve 7.2g of trimethylamine in N -40g of methylpyrrolidone, then add it to the reactor, neutralize at 50℃ for 1 hour; then add 176.72g of deionized water of formula, and carry out reverse emulsification under high-speed dispersion conditions; finally add chain extender to the emulsion 4.8 g of butanediamine, continued emulsification and chain extension for 0.5 h...

Example Embodiment

[0049] 4. Resin Example 2:

[0050] In the reactor, 60g of the polycarbonate diol (Mn=1000) compound was dewatered at 100°C for 3 hours under negative pressure of -0.07MPa to confirm that the water content was 0.025%; then hydrogenated diphenylmethane diisocyanate Add 40g, pre-react at 90℃ for 30min, then add 0.12g of catalyst, and react for 0.5 hours to reach the set NCO value of 11.01~10.91%; then add 14g of dimethylolbutyric acid and continue the reaction at 95℃ After 2 hours, reach the set NCO value of 6.39~6.09%; then add 12g of propylene glycol and continue the reaction at 80℃ for 1 hour to reach the set NCO value of 1.92~1.72%; then dissolve 13.6g of triethylamine in N- 24g of methylpyrrolidone, then added to the reactor, neutralized at 60°C for 45min; then added the formula amount of deionized water 214.28g, reversed emulsification under high-speed dispersion conditions; finally added chain extender hexamethylene in the emulsion 6g of amine, continued emulsification and ...

Example Embodiment

[0052] 5. Resin Example 3:

[0053] In the reaction kettle, 76g of polycaprolactone diol (Mn=2000) compound was dewatered at 103℃ for 2 hours under negative pressure of -0.07MPa, and the water content was 0.03%; then hydrogenated diphenylmethane diisocyanate Add 56g, pre-react at 80℃ for 30min, then add 0.2g of catalyst, and react for 1 hour to reach the set NCO value of 12.11-11.81%; then add 11.6g of dimethylolbutyric acid and continue at 90℃ React for 3 hours to reach the set NCO value of 6.59~6.29%; then add 4g of butanediol and continue the reaction at 95°C for 0.5 hours to reach the set NCO value of 2.27~2.07%; then add 11.6g of triethylenediamine Dissolve in 32g of N-methylpyrrolidone, then add to the reactor, and neutralize at 65°C for 0.5 hours; then add 185.4g of deionized water of the formula, and perform reverse emulsification under high-speed dispersion; finally add to the emulsion 3.2 g of chain extender butanediamine, continued emulsification and chain extension f...

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Abstract

The invention relates to an aqueous stone-chip-resistant polyurethane dispersion body and a preparation method thereof, wherein the technical parameters of the polyurethane dispersion body are that the pH value is 7.5-9.5, the viscosity is 50-200 CPS, the solid content is 35+/-3 wt%, the acid value is 17-42 mgKOH/g, and the weight average molecular weight Mw is controlled at 25000-70000. The invention further provides a preparation method of the aqueous stone-chip-resistant polyurethane dispersion body. According to the present invention, the aqueous stone-chip-resistant polyurethane dispersion body has low VOC content so as to meet the environmental protection requirement, and further has excellent stone-chip resistance; and the resin synthesis route is simple, and the method is suitablefor industrialized large-scale production.

Description

technical field [0001] The invention relates to the technical field of polyurethane resin synthesis, in particular to a water-based anti-stone chip polyurethane dispersion and a preparation method thereof. Background technique [0002] With the rapid development of economy and transportation technology, vehicles such as cars, passenger cars, high-speed rails, and subways have been integrated into everyone's life and have become an indispensable part of life. During the driving process of these vehicles, they are always likely to be hit by various wind, sand and hard objects. When they are hit by foreign objects during driving, the faster the speed, the greater the damage to the surface coating of the vehicle. Vehicle surface coatings are generally composite coatings, generally including a primer layer, a mid-coat paint layer and a top coat layer. From the perspective of environmental protection, it is hoped that the thickness of the coating can be reduced under the premise ...

Claims

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Application Information

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IPC IPC(8): C08G18/75C08G18/76C08G18/66C08G18/44C08G18/42C08G18/32C08G18/34C08G18/10C09D175/04C09D175/06
CPCC08G18/10C08G18/4277C08G18/44C08G18/755C08G18/7671C08L2205/025C08L2205/035C09D175/04C09D175/06C08G18/348C08G18/3206C08G18/3228C08L33/04C08L61/32
Inventor 胡启明杨鹏飞张杰董军胜黄鹂
Owner 湖南湘江关西涂料有限公司
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