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Photo-induced reversible self-repair polyurethane film and repair method

A polyurethane film and self-healing technology, applied in the field of photoreversible self-healing polyurethane film and its preparation and repair, achieves the effects of easy construction, simple process conditions and good thermal stability

Inactive Publication Date: 2014-02-12
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are no relevant reports on the application of modified polyurethane films.

Method used

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  • Photo-induced reversible self-repair polyurethane film and repair method
  • Photo-induced reversible self-repair polyurethane film and repair method
  • Photo-induced reversible self-repair polyurethane film and repair method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] At room temperature and under the protection of argon, 20g of 7-hydroxy-4-methylcoumarin was added to a 250ml two-necked flask, 100g of N,N-dimethylformamide was added and electromagnetic stirring was started to make 7-hydroxy-4- Dissolve methyl coumarin, then add 20g of 2-bromoethanol dropwise at a constant speed, add 32g of catalyst anhydrous potassium carbonate at one time after 5min, raise the temperature of the reaction system to 88°C and react for 18h to end the reaction; when the temperature of the reaction system drops to After room temperature, pour it into 400g of ice water and stir for 30min, filter the precipitate, wash with 500g of distilled water, dry at 50°C for 48h, and recrystallize twice with ethyl acetate to obtain alcoholic hydroxyl-containing 7-hydroxyethoxy-4-methanol base coumarin.

Embodiment 2

[0034] Add 2g of hexamethylene diisocyanate trimer to a 50ml three-necked flask, degas it under vacuum at 120°C for 2h, cool down to 50°C, add 3g of N,N-dimethylformamide to dissolve and dilute, start electromagnetic stirring and pass Argon protection, then the 7-hydroxyethoxy-4-methylcoumarin of 0.81g prepared in Example 1 and 1 drop of 10% dibutyltin dilaurate ethyl acetate solution were dissolved in 7gN,N- Dimethylformamide was transferred to a constant pressure dropping funnel, and added dropwise to the reaction system at a constant speed, and the drop was completed within 1 hour; after raising the temperature of the system to 70°C and reacting for 3 hours, 1.26 g of polyethylene glycol (average molecular weight 400 g / mol), and continue to react at 70°C for 12 hours to obtain a polyurethane solution containing coumarin side groups. Apply this solution directly on a polytetrafluoroethylene plate and dry it under vacuum at 80°C for 48 hours (vacuum pressure 3 Pa), and fina...

Embodiment 3

[0036] Add 28g of 5,7-dihydroxy-4-methylcoumarin into a 250ml two-necked flask, add 100g of N,N-dimethylformamide to dissolve and start electromagnetic stirring, then add 56g of 2-bromoethanol dropwise at a constant speed, After 5 minutes, add 56g of catalyst anhydrous potassium carbonate at one time, raise the temperature to 88°C and react for 18h under the protection of argon, and then end the reaction. When the reaction system drops to room temperature, add 400g of anhydrous ether to extract the organic layer and filter out the inorganic salt K 2 CO 3 , the organic layer was washed with a large amount of water until the pH of the aqueous phase = 7, and the solvent diethyl ether was removed using a vacuum rotary evaporator (vacuum pressure3 Pa), to obtain a brown oily mixture, which was separated by column chromatography (eluent: ethyl acetate:petroleum ether=2:1) ​​to obtain the pure substance 5,7-dihydroxyethoxy-4-methylcoumarin .

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Abstract

The invention relates to a photo-induced reversible self-repair polyurethane film and a preparation method and a repair method thereof. The polyurethane film mainly comprises 10 to 40 parts of phenolic hydroxyl coumarin derivative, 10 to 50 parts of alkyl bromal compound, 10 to 40 parts of polyisocyanate, and 10 to 30 parts of polyether polyol or polyester polyol. The preparation method comprises the following steps of: generating phenolic hydroxyl coumarin by using the phenolic hydroxyl coumarin derivative and the alkyl bromal compound under the action of absolute potassium carbonate; and reacting the phenolic hydroxyl coumarin, the polyisocyanate and the polyether polyol or the polyester polyol to obtain polyurethane solution, and performing cross linking under the irradiation of ultraviolet with wavelength of 350 nanometers after the film is formed to obtain the polyurethane film. The damaged surface is irradiated through the ultraviolet with wavelength of 254 to 350 nanometers, so that the reduced coumarin monomers are subjected to dimer cross linking reaction again and the purpose of repairing cracks is fulfilled. Compared with the prior art, the polyurethane film has the characteristics of good film forming property and high transparency; and the repair process is simple and has low cost.

Description

technical field [0001] The invention relates to a photoreversible self-repairing polyurethane film, a preparation method and a repairing method thereof. Background technique [0002] The full name of polyurethane is polyurethane, which is a general term for macromolecular compounds containing repeated carbamate groups in the main chain. It is formed by the addition polymerization of organic diisocyanate or polyisocyanate and dihydroxy or polyhydroxy compounds. When synthesizing polyurethane resin, products with various properties and uses can be produced by changing the chemical structure of raw materials, specifications, varieties, etc. Rebound, slow rebound, high density, low density and other products, usually products made of polyurethane resin include foam plastics, elastomers, coatings, adhesives, fibers, synthetic leather and paving materials. It is widely used in electromechanical, shipbuilding, aviation, vehicles, civil engineering, light industry and textile and o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L75/08C08L75/06C08G18/66C08G18/30C08G18/32C08G18/38C08J5/18C08J3/28C08J3/24
Inventor 凌军容敏智章明秋
Owner SUN YAT SEN UNIV
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