Wear-resistant self-repairing polyurethane composite coating agent based on shape memory and preparation method thereof

A self-healing, polyurethane technology, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the problems that self-healing cannot be achieved, cracks cannot be in close contact, and it is difficult to achieve intermolecular interaction, so as to promote self-healing efficiency and range of raw materials. Wide selection of effects with high self-healing efficiency

Pending Publication Date: 2021-08-06
SHAANXI UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the material is greatly damaged, the cracks cannot be in close contact, and it is difficult to achieve intermolecular interaction, so that self-healing cannot be achieved.

Method used

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  • Wear-resistant self-repairing polyurethane composite coating agent based on shape memory and preparation method thereof

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preparation example Construction

[0029] The invention discloses a preparation method of a wear-resistant self-repairing polyurethane composite coating agent based on shape memory. The process steps are as follows:

[0030] (1) Dry 10-70 parts of polyester diol and 5-20 parts of hydrophilic monomer in a vacuum oven at a temperature of 100-120° C. for 1-4 hours to remove moisture therein. Add polyester diol and hydrophilic monomer into a three-necked flask equipped with a stirrer.

[0031] (2) Add 30 to 160 parts of diisocyanate to the three-necked flask in step (1), heat and stir in a water bath in the presence of a catalyst, set the water bath temperature of the reaction system to 70 to 90°C, and stir for 2 to 3 hours.

[0032] (3) The temperature of the water bath is reduced to 50-70° C., and 15-60 parts of monomers capable of forming quadruple hydrogen bonds and 15-60 parts of monomers containing metal coordination bond structural units are added to the reaction solution obtained in step (2). Ligand post-r...

Embodiment 1

[0048] First, take 10 parts of polycarbonate diol and 5 parts of 2,2-dimethylolbutyric acid, put them in a vacuum drying oven, and dry them under vacuum at 120° C. for 2 hours to remove the moisture therein. Add the dried polycarbonate diol and 2,2-dimethylol butyric acid into a three-necked flask equipped with a stirrer. Then add 30 parts of isophorone diisocyanate into the three-necked flask, heat and stir in a water bath in the presence of dibutyltin dilaurate, set the temperature of the water bath in the reaction system to 70°C, and stir at a speed of 300r / min for 2h. Next, lower the temperature of the water bath to 50°C, add 15 parts of 5-(2-hydroxyethyl)-6-methyl-2-aminouracil and 15 parts of 2,6-pyridinedicarboxylic acid, at 300r / min Stir at high speed for 1h. Next, after the temperature of the water bath was lowered to 40° C., 5 parts of terbium trifluoromethanesulfonate were added dropwise, and stirring was continued for 40 min at a speed of 300 r / min. Finally, lowe...

Embodiment 2

[0051] First, take 35 parts of polyethylene adipate diol and 20 parts of 2,2-dimethylolbutyric acid, put them in a vacuum drying oven, and dry them under vacuum at 100° C. for 1 hour to remove the moisture therein. Add the dried polyethylene adipate diol and 2,2-dimethylol butyric acid into a three-necked flask equipped with a stirrer. Then add 65 parts of hexamethylene diisocyanate into the three-necked flask, heat and stir in a water bath in the presence of stannous octoate, set the temperature of the water bath in the reaction system to 75°C, and stir at a speed of 400r / min for 3h. Next, lower the temperature of the water bath to 55°C, add 35 parts of 2-ureido-4-1[H]-pyrimidinone and 28 parts of 2,6-diaminopyridine, and stir at 400 r / min for 2 hours. Next, after the temperature of the water bath was lowered to 40° C., 20 parts of ferric chloride was added dropwise, and stirring was continued for 50 minutes at a speed of 400 r / min. Finally, lower the temperature of the wate...

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Abstract

The invention discloses a wear-resistant self-repairing polyurethane composite coating agent based on shape memory and a preparation method thereof, and belongs to the technical field of coating agent production. The preparation method comprises the following steps: carrying out prepolymerization reaction on polyester diol and diisocyanate to obtain an isocyanate group-terminated prepolymer; and introducing a monomer for forming quadruple hydrogen bonds and a ligand containing a metal coordination bond structural unit into the prepolymer to obtain the wear-resistant self-repairing polyurethane composite coating agent based on shape memory. The process is simple, easy to control and suitable for industrial production. Quadruple hydrogen bonds and metal ion coordination bonds are used as sacrifice bonds to dissipate energy and improve toughness and strength through a cross-linking effect, and self-repairing efficiency is promoted through interaction among molecular chains; a shape memory effect is realized by utilizing the crystallization reversibility of a molecular chain, and deformation caused by friction or self-repairing is prevented; and the wear-resistant self-repairing polyurethane composite coating agent is good in stability, excellent in tribological performance and high in repairing efficiency and can be applied to various fields.

Description

technical field [0001] The invention belongs to the technical field of finishing agent production, and relates to a wear-resistant self-repairing polyurethane composite finishing agent based on shape memory and a preparation method thereof. Background technique [0002] Polyurethane (PU) is widely used in coatings, synthetic fibers, automobile industry, medical supplies and other fields due to its high tensile strength, excellent low temperature resistance, chemical corrosion resistance and other excellent properties. However, when it is used as a microfiber synthetic leather coating material, it is inevitable that the surface or interior will be damaged due to friction or impact during processing, transportation, storage and use, which will seriously affect the appearance, safety and reliability of the material used. Persistent. [0003] In response to the above problems, self-healing coatings emerged as the times require. Among them, the self-healing system based on rever...

Claims

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Application Information

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IPC IPC(8): C08G18/12C08G18/34C08G18/42C08G18/44C08G18/66C08G18/32C09D175/04C09D175/06
CPCC08G18/12C08G18/6659C08G18/44C08G18/348C08G18/4238C08G18/4277C09D175/06C09D175/04C08G2280/00
Inventor 刘超殷青郝丽芬鲍艳马建中吕斌沈连根赵舜华徐欣欣
Owner SHAANXI UNIV OF SCI & TECH
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