Disulfide bond and hydrogen bond-containing double self-repairing polyurethane coating for invisible car clothing and preparation method thereof

A polyurethane coating and disulfide bond technology, applied in polyurea/polyurethane coatings, coatings, etc., can solve the problems of low self-repair efficiency and single self-repair mode, and achieve fast repair speed, high strength and repair efficiency high effect

Pending Publication Date: 2019-12-20
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These two kinds of self-repair need to be stimulated by ultraviolet light to complete self-repair, and the self-repair efficiency is not high
At present, the research on self-healing is still based on a single self-healing method, and the dual self-healing method that combines reversible covalent bonds and reversible non-covalent bonds has not been reported.

Method used

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  • Disulfide bond and hydrogen bond-containing double self-repairing polyurethane coating for invisible car clothing and preparation method thereof
  • Disulfide bond and hydrogen bond-containing double self-repairing polyurethane coating for invisible car clothing and preparation method thereof
  • Disulfide bond and hydrogen bond-containing double self-repairing polyurethane coating for invisible car clothing and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Add 1 part of 2-amino-6methyl-4-[3H]pyrimidinone and 10 parts of HMDI into a 250ml three-neck flask, under the protection of inert gas, react at 60°C for 72h, cool to 40°C after the reaction stops, and use 300ml Wash 2 times with dry n-hexane to remove unreacted HMDI, and dry in vacuum at 50°C overnight to obtain white powder 2-(6-isocyanate)-6-methyl-4[3H]-pyrimidinone (UPy-NCO) single-ended Isocyanate-based intermediate in 92% yield.

Embodiment 2

[0054] Mix 1 part of 2-(6-isocyanate)-6-methyl-4[3H]-pyridone with 3 parts of 2-amino-2-methyl-1,3-propanediol, 50ml of dry CHCl 3 Add it into a 100ml three-necked flask, and react at 90°C for 10h under the protection of an inert gas. After the reaction was completed, filter and wash with 30ml of dry CHCl 3 After washing 2 times, the crude product was dissolved in DMF to obtain a cloudy solution. The cloudy solution was then centrifuged to obtain a supernatant. The supernatant was precipitated in excess ether to obtain a white product, which was filtered and washed several times with acetone, and vacuum-dried at 50°C for 4 hours to obtain a white powder (UPy-diol) containing multiple hydrogen bond chain extender B with a yield of 78%.

Embodiment 3

[0056] Weigh 1 part of hydroxyl-terminated polybutadiene (Krasol TM LBH-2000), 3 parts of toluene diisocyanate (TDI), dissolved in THF, reacted at 80°C for 3.5h. 1 part of bis(2-hydroxyethyl) disulfide and 1 part of UPy-diol prepared in Example 2 were added to DMF, and the reaction was continued at 85°C for 5 hours. After pouring into the mold overnight to evaporate the solvent, put it in an oven at 80°C for 24 hours, and dry it in a vacuum at 70°C for 24 hours to obtain a double self-healing polyurethane film of disulfide bond and hydrogen bond.

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Abstract

The invention relates to a disulfide bond and hydrogen bond-containing double self-repairing polyurethane coating for invisible car clothing and a preparation method thereof. The raw materials of theself-repairing polyurethane coating comprise an oligomer diol, a diisocyanate, a disulfide bond-containing chain extender A, and a multiple hydrogen bond-containing chain extender B. A method for preparing the multiple hydrogen bond-containing chain extender B is further provided, and the method comprises the following steps: first, 2-amino-6-methyl-4-[3H]pyrimidone (UPy) is reacted with an diisocyanate to form an intermediate with a single-terminal isocyanate group, then the intermediate is reacted with a mono-amino diol, and the multiple hydrogen bond-containing chain extender B is formed byusing the activity difference of reactive groups. The disulfide bond and hydrogen bond-containing double self-repairing polyurethane coating is further prepared by random copolymerization of the rawmaterials. A self-repairing process of the disulfide bond and hydrogen bond-containing double self-repairing polyurethane coating does not require stimulation by conditions such as temperature, light,pH and redox, a repairing speed is fast, and the repairing can be completed within 3 min at room temperature.

Description

technical field [0001] The invention relates to the field of self-healing polyurethane, in particular to a double self-healing polyurethane coating containing disulfide bonds and hydrogen bonds for invisible car coverings and a preparation method thereof. Background technique [0002] With the rapid popularization of family cars, it is inevitable to encounter various problems during use, such as: stone scratches, acid rain corrosion, nail scratches, etc. Among the various spare parts of the car, only the paint surface cannot be replaced by the original factory. It is formed by rapid drop at low temperature and has certain corrosion resistance. However, the paint surface repainted after rework in the later period cannot meet the requirements in terms of raw materials, construction technology and baking temperature, which will cause the paint surface to be easily oxidized and even damage the metal body. Therefore, it is particularly important to protect the original car paint...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/14C09D175/04C08G18/69C08G18/65C08G18/61C08G18/10C08G18/32
CPCC08G18/10C08G18/61C08G18/65C08G18/6576C08G18/69C09D175/04C09D175/14C08G18/3863C08G18/3848
Inventor 鲁在君武素盼于美杰刘铭夏永全宫新建衣同刚
Owner SHANDONG UNIV
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