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Self-repairing polyurethane based on two-way repairing structure, preparation method and application thereof

A technology for repairing structure and polyurethane, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the problems such as no self-healing polyurethane material reports, loss of use efficiency, cracking, etc., and achieve the effect of excellent repair rate

Active Publication Date: 2021-04-23
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, these products are often exposed to the environment during use, and will suffer from external collisions, scratches, kinks, chemical corrosion, UV photolysis aging or a combination of effects, resulting in micro-cracks and cracks inside, making them useless. Efficiency, directly affects the service life of the product
[0004] At present, self-healing polyurethane has been reported, but these reports all adopt a one-way repairing structure, and there is no report on a self-healing polyurethane material with a two-way repairing structure

Method used

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  • Self-repairing polyurethane based on two-way repairing structure, preparation method and application thereof
  • Self-repairing polyurethane based on two-way repairing structure, preparation method and application thereof
  • Self-repairing polyurethane based on two-way repairing structure, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0084]Preparation Example 1: Preparation of Solid Product A1 and Solid Product A2

[0085] At 40° C., 1.1 mol of p-hydroxybenzaldehyde in isopropanol (300 mL) was added into 0.5 mol of oxalodihydrazide in glacial acetic acid (250 mL), and stirred at 300 rpm for 4 h. After the reaction, filter under reduced pressure, wash with ethanol three times at 50° C., then wash with water three times, and dry the washed product to obtain solid product A1.

[0086] At 60° C., 0.2 mol of furfurylamine was added into a solution of resorcinol diglycidyl ether (0.1 mol) dissolved in methanol (50 mL), and reacted for 6 h under stirring at 500 rpm. After the reaction, the product was distilled under reduced pressure, washed with secondary water, and dried to obtain the solid product A2.

[0087] And, the proton nuclear magnetic spectra of solid product A1 and solid product A2 are respectively as follows figure 1 and figure 2 shown.

Embodiment 1

[0088] Embodiment 1: prepare polyurethane

[0089] At 50°C, 0.1 mol of isophorone diisocyanate was slowly added to the molecular weight M dissolved in N,N-dimethylformamide (300 mL) n In the polyethylene glycol (PEG 600, 0.05mol) of =600, add the dibutyltin dilaurate of 500ppm (based on the total weight of isophorone diisocyanate and polyethylene glycol), react 3h under rapid stirring, Obtain polyurethane prepolymer pre-600.

[0090] At 50°C, dissolve 0.22mol of polyurethane prepolymer pre-600 and 0.1mol of mixture A (0.05mol of solid product A1 in Preparation 1 and 0.05mol of N,N-dimethylformamide (200mL in total)) The solid product A2) in Preparation Example 1 was mixed and reacted for 12 h under stirring at 200 rpm to obtain linear polyurethane 1-600.

[0091] Add 0.06 mol of N,N'-(4,4'-methylenediphenyl)bismaleimide to linear polyurethane 1-600 (the entire amount obtained in the previous step) at 55 °C N,N-dimethylformamide dispersion liquid, mixed and stirred evenly, t...

Embodiment 2

[0092] Embodiment 2: prepare polyurethane

[0093] At 35°C, 0.1 mol of isophorone diisocyanate was slowly added to the molecular weight M dissolved in N,N-dimethylformamide (300 mL) n In the polyethylene glycol (PEG 1000, 0.05mol) of =1000, add the dibutyltin dilaurate of 500ppm (based on the total weight of isophorone diisocyanate and polyethylene glycol), react 4h under rapid stirring, The polyurethane prepolymer pre-1000 was obtained.

[0094] At 40°C, 0.22mol of polyurethane prepolymer pre-1000 and 0.1mol were dissolved in dimethyl sulfoxide (200mL in total) in mixture A (0.05mol of solid product A1 in Preparation 1 and 0.05mol of Preparation 1 The solid product A2) was mixed and reacted for 20h under stirring at 200rpm to obtain linear polyurethane 1-1000.

[0095] Add 0.06 mol of N,N'-(4,4'-methylenediphenyl)bismaleimide to linear polyurethane 1-1000 (the entire amount obtained in the previous step) at 60 °C N,N-dimethylformamide dispersion liquid, mixed and stirred e...

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Abstract

The invention relates to the field of self-repairing photo-curing materials, and discloses self-repairing polyurethane based on a two-way repairing structure, a preparation method and application thereof. The polyurethane contains structural units provided by R1, R2, R3, R4, R5, R6 and R7; wherein R1 is polyethylene glycol, R2 is isophorone diisocyanate, R3 is terephthalaldehyde, R4 is oxalyl dihydrazide, R5 is resorcinol diglycidyl ether, R6 is furfuryl amine, and R7 is N, N'-(4, 4'-methylene diphenyl)bismaleimide. The polyurethane provided by the invention has excellent self-repairing capability and high self-repairing efficiency, the service life of the material can be prolonged, and the hidden danger of microcracks caused by mechanical damage is reduced.

Description

technical field [0001] The present invention relates to the field of self-healing polyurethane, in particular, to a self-healing polyurethane based on a two-way repairing structure, a method for preparing a self-healing polyurethane based on a two-way repairing structure, and a self-healing polyurethane based on a two-way repairing structure prepared by the method Application of polyurethane and self-healing polyurethane based on bidirectional repair structure in at least one product selected from coatings, electronic products and packaging materials. Background technique [0002] Due to its excellent mechanical properties and good chemical stability, polyurethane materials are widely used in the fields of transportation, electronics, packaging, construction and biomaterials. [0003] However, these products are often exposed to the environment during use, and will suffer from external collisions, scratches, kinks, chemical corrosion, UV photolysis aging or a combination of ...

Claims

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Application Information

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IPC IPC(8): C08G18/66C08G18/48C08G18/32C08G18/83C09D175/14
CPCC08G18/6685C08G18/4833C08G18/325C08G18/3834C08G18/833C09D175/14
Inventor 唐瀚滢解希铭杜影王丽静王丽丽赵丽娜赵青松
Owner CHINA PETROLEUM & CHEM CORP
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