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Waterborne polyurethane resin with self-repairing function and preparation method thereof

A polyurethane resin, self-healing technology, applied in the field of organic polymer materials, can solve problems such as the inability to popularize and apply materials, and achieve the effects of low cost, shortened process flow, and increased hydrogen bond content

Inactive Publication Date: 2019-06-04
HUNAN BANFERT NEW MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, most active high-performance self-healing polyurethane elastomers are solvent-based, which require a large amount of organic solvents to dilute in the process of preparation and use, which brings many disadvantages to the environment and applications; among water-based self-healing materials, more materials are studied Most of them are hydrogels, because most of the hydrogels have obvious defects in their own mechanical strength, toughness and constructability, and it is almost impossible to apply them in the field of materials.

Method used

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  • Waterborne polyurethane resin with self-repairing function and preparation method thereof
  • Waterborne polyurethane resin with self-repairing function and preparation method thereof
  • Waterborne polyurethane resin with self-repairing function and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0037] 100g polytetrahydrofuran ether glycol (weight average molecular weight is 1000, hydroxyl value is 112mgKOH / g) is heated up to 120 ℃, then vacuum dehydration at -0.07MPa for 2 hours; then add 90 grams of methyl ethyl ketone, and cool to 80 ℃, add 45g phorone diisocyanate and 0.3g dibutyltin laurate, maintain the reaction temperature to 80-90℃, react for 3h; add 25.8g 2-hydroxyethyl disulfide and 9.2g dimethylolpropionic acid and 53g phorone diisocyanate, maintain the reaction temperature and adjust it to 80-90°C, react for 5h, then analyze the isocyanate group content in the reaction system by di-n-butylamine-acetone titration method, the isocyanate group content in the reaction system is 2.7 When ±0.2%, lower the temperature in the reaction system to 10-20°C, then add 5.8g of triethylamine and 300g of ice-water mixture to carry out neutralization and emulsification reaction for 10min, adjust the temperature to 0-5°C, add 15.2g of iso The phoerone diamine chain extender ...

Embodiment 2

[0039]100g of polycarbonate diol (weight-average molecular weight of 1000, hydroxyl value of 112mgKOH / g) was heated to 120°C, then vacuum dehydrated at -0.07MPa for 2 hours; then 90g of methyl ethyl ketone was added, and the temperature was lowered to 80 ℃, add 45g of phorone diisocyanate and 0.3g of dibutyltin laurate, maintain the reaction temperature to 80-90℃, and react for 3h; add 27.2g of 2-hydroxyethyl disulfide and 9.2g of dimethylol propionic acid and 65g of dicyclohexyl diisocyanate, maintain the reaction temperature and adjust it to 80-90°C, react for 6h, then analyze the isocyanate group content in the reaction system by di-n-butylamine-acetone titration method, the isocyanate group content in the reaction system is 2.6 When ±0.2%, lower the temperature in the reaction system to 10-20°C, then add 5.8g of triethylamine and 300g of ice-water mixture to carry out neutralization and emulsification reaction for 10min, adjust the temperature to 0-5°C, add 16.5g of iso Th...

Embodiment 3

[0041] Heat 100g of polyadipate 1,6-hexanediol diol (weight-average molecular weight 1000, hydroxyl value 112mgKOH / g) to 120°C, then vacuum dehydrate at -0.07MPa for 2 hours; then add 90 Add 34.5 g of toluene diisocyanate and 0.3 g of dibutyltin laurate, keep the reaction temperature at 80-90 °C, and react for 3 hours; add 30.7 g of 2-hydroxyethyl disulfide and 10.1 g dimethylol butyric acid and 71g dicyclohexyl diisocyanate, maintain the reaction temperature and adjust it to 80-90°C, react for 6h, then analyze the isocyanate group content in the reaction system by di-n-butylamine-acetone titration method, in the reaction system When the isocyanate group content in the reaction system is 2.8±0.2%, reduce the temperature in the reaction system to 10-20°C, then add 5.8g of triethylamine and 300g of ice-water mixture to carry out neutralization and emulsification reaction for 10min, and adjust the temperature to 0-20°C. 5°C, add 14.5g of isophorone diamine chain extender to react...

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Abstract

The invention discloses waterborne polyurethane resin with a self-repairing function. The waterborne polyurethane resin comprises the following raw materials (by weight): 35-60 parts of polyol, 30-45parts of polyisocyanate, 3-5 parts of an anionic hydrophilic chain extender, 9-15 parts of a small molecular disulfide bond chain extender, 0.1-0.2 part of a catalyst, 2-4 parts of triethylamine, and4-8 parts of a small molecular water-soluble diamine chain extender. The invention also comprises a preparation method of the above waterborne polyurethane resin with a self-repairing function. The waterborne polyurethane resin of the invention can show micro-scratch self-repairability, water dilutability, high strength, high elasticity and other excellent properties, and can be widely applied inthe fields of concrete coatings, anticorrosive coatings, automobile coatings, 3C products, biological medicine materials, lithium batteries, aerospace, etc.

Description

technical field [0001] The invention relates to the field of organic polymer materials, in particular to a water-based polyurethane resin with self-repairing function and a preparation method thereof. Background technique [0002] As a new type of intelligent material, self-healing polyurethane material can repair cracks or local damage caused by external force during use by simulating the mechanism of biological damage healing, thereby restoring its original function and prolonging its service life. . [0003] The current self-healing polyurethane preparation method is to implant thermally reversible Diels-Alder (DA) covalent bonds in the polyurethane body structure, that is, after the material with thermally reversible chemical bonds is damaged, it can be heat treated. The repair effect on material damage, such as the disclosures of patent numbers CN105176063B, CN107216643A, CN108912371A, etc., all adopt this principle; there is a disulfide bond implanted in the polyureth...

Claims

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Application Information

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IPC IPC(8): C08G18/66C08G18/48C08G18/44C08G18/42C08G18/10C08G18/34C08G18/32
Inventor 谢成王德修张冬明李新雄
Owner HUNAN BANFERT NEW MATERIALS TECH
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