Self-repairing coating composition, self-repairing coating layer, protective film containing coating layer and application of protective film

A self-healing and composition technology, applied in the field of self-healing coatings, protective films, and self-healing coating compositions, can solve the problems of insufficient UV resistance, high temperature and high humidity resistance, decreased self-healing performance of coatings, and disappearance. wait for the problem

Active Publication Date: 2018-07-03
张进波
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the polyester main agent has deficiencies in UV resistance, high temperature and high humidity resistance, etc., especially under the condition of outdoor use, due to the hydrolysis of the polymer chain, the surface of the coating composition will quickly lose its luster, and the self-healing property Rapid decline or even disappear
On the other hand, the coating composition using acrylic resin as the mai

Method used

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  • Self-repairing coating composition, self-repairing coating layer, protective film containing coating layer and application of protective film
  • Self-repairing coating composition, self-repairing coating layer, protective film containing coating layer and application of protective film

Examples

Experimental program
Comparison scheme
Effect test

Synthetic example 1

[0056] Add 2-methyl-1,3-propanediol (369.5g, 4.1mol), diethyl carbonate (366.2g, 3.1mol), and the catalyst sodium ethoxide into a 1000ml three-necked volumetric flask equipped with a stirrer, thermometer and condenser. 20% ethanol solution (0.12g, 0.35mmol). Under a nitrogen atmosphere, keep the temperature at 100-120°C and continue to stir to distill out the by-product ethanol. When the amount of ethanol evaporated reaches 30-40% of the theoretical value, the temperature is increased to 170°C at a rate of 4-10°C / hour, and the temperature is maintained until the ethanol distillation is completed. Next, keep the temperature at 170°C, gradually reduce the pressure in the reaction device to 1.3kPa, continue the reaction for 2 hours for further reaction, and finally obtain a polycarbonate diol with a number average molecular weight of about 500, a molecular weight distribution of 1.8, and a Tm~-5 ℃, purity> 99% is recorded as A1.

Synthetic example 2

[0058] Add 1,5-pentanediol (244.75g, 2.35mol), 1,6-hexanediol (277.72g, 2.35mol), and diethyl carbonate to a 1000ml three-necked volumetric flask equipped with a blender, thermometer and condenser. Ester (366.2g, 3.7mol), catalyst sodium ethoxide 20% ethanol solution (0.14g, 0.41mmol). Under a nitrogen atmosphere, keep the temperature at 100-120°C and continue stirring to distill out the ethanol produced. When the distilled amount of ethanol reaches 30-40% of the theoretical value, the temperature is increased to 170°C at a rate of 4-10°C / hour, and the temperature is maintained until the ethanol distillation is completed. Next, keep 170°C, gradually reduce the pressure in the reaction device to 1.3kPa, continue the reaction for 2 hours for further reaction, obtain a polycarbonate diol with a number average molecular weight of about 500, a molecular weight distribution of 1.9, Tm ~ -10°C , Purity> 99% is recorded as A2.

Synthetic example 3

[0060] Using 315.4g of 2-methyl-1,3-propanediol (3.5mol), other conditions were the same as in Synthesis Example 1, and a polycarbonate diol with a number average molecular weight of about 1000 was obtained, with a molecular weight distribution of 2.0, Tm~-7℃ , Purity> 99% is recorded as A3.

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Abstract

The invention discloses a self-repairing coating composition. The self-repairing coating composition comprises the following components in parts by weight: 100 parts of fluorocarbon resin, 10-30 partsof a polycarbonate diol, and 10-30 parts of an isocyanate curing agent; the fluorocarbon resin has a number average molecular weight of 1000-50,000, a glass transition temperature of -20 to 50 DEG C,a hydroxyl value of 30-100mgKOH/g and an acid value of 1-10mgKOH/g; and the polycarbonate diol is obtained by performing an interesterification condensation reaction on a diester carbonate and a diolwith a main chain carbon number of more than 2, and the polycarbonate diol has a number average molecular weight of 200-2000. The invention also discloses a self-repairing coating layer obtained by coating a substrate with a solution prepared from the coating composition, a protective film containing the coating layer and an application of the protective film. The self-repairing coating composition provided by the invention has excellent weather resistance and stable self-repairing properties, and is particularly suitable for long-term outdoor use.

Description

Technical field [0001] The invention relates to the field of coating compositions, in particular to a self-healing coating composition, a self-healing coating prepared from the coating composition, a protective film containing the self-healing coating, and applications thereof. Background technique [0002] Plastic materials and wood materials, etc., have excellent processing and molding characteristics. Compared with glass and metal, the surface hardness is low, and the scratch resistance is poor. The method of surface spraying / brushing coating varnish with high crosslinking density can improve scratch resistance. However, a too high crosslinking density will also cause the coating to be brittle and hard, and the bonding force to the substrate will decrease. Once scratched, it will further develop into cracks or even fall off, and its protective function will be lost. In daily production and life, the surface of passenger cars is easily damaged by wind, sand and gravel, and th...

Claims

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Application Information

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IPC IPC(8): C09D127/12C09D175/04
CPCC09D127/12C08L75/04
Inventor 李燚汪冬朱晓春丁海霖
Owner 张进波
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