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Preparation method of thermally reversible cross-linked polyurethane capable of being subjected to photo-grafting

A technology of cross-linked polyurethane and photosensitivity, applied in the field of polyurethane, can solve problems such as complex surface treatment, achieve the effect of solving environmental problems and solving complex surface grafting processes

Active Publication Date: 2021-07-30
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technology allows for creation of materials with both properties that work together like an irreversibly cross linked polymer network (thermal) and a photoactive agent attached at one end. These two functions allow them to perform various processes such as melting and reprocessing without losing their original shape when they are used repeatedly over time. Additionally, these materials have improved durability compared to traditional methods due to the presence of specific types of bonds between molecules within it's structure. Overall, this new type of coating has potential applications beyond just decorative ones - making repairs faster than current options available today.

Problems solved by technology

The technical problem addressed by this patented technology relates how to create a simpler way to modify surfaces while maintaining good thermal stability during use without requiring complex treatments or modifications.

Method used

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  • Preparation method of thermally reversible cross-linked polyurethane capable of being subjected to photo-grafting
  • Preparation method of thermally reversible cross-linked polyurethane capable of being subjected to photo-grafting
  • Preparation method of thermally reversible cross-linked polyurethane capable of being subjected to photo-grafting

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[0012] The preparation method of the thermally reversible crosslinked polyurethane proposed by the present invention comprises the following steps:

[0013] (1) Dihydroxybenzophenone compound, polyisocyanate compound, polyol compound and catalyst are mixed to obtain a mixture, and described dihydroxybenzophenone compound, polyisocyanate compound, polyol compound and catalyst The mixing molar ratio is: dihydroxybenzophenone compound: polyisocyanate compound: polyol compound: catalyst=1: (0.5~3): (1~5): (0.001~0.005);

[0014] (2) curing the mixture in step (1), the curing temperature is 40-70°C, and the curing time is 8-24 hours, to obtain a molded thermally reversible cross-linked polyurethane;

[0015] (3) Soak the formed reversible cross-linked polyurethane in step (2) in a solution containing a photosensitive monomer, then irradiate with an ultraviolet lamp for a certain period of time, and then wash to obtain a surface-modified thermally reversible cross-linked polyurethan...

Embodiment 1

[0030] (1) 4,4-dihydroxybenzophenone, dicyclohexylmethane diisocyanate, polycaprolactone diol and catalyst triethylenediamine are mixed to obtain a mixture, described dihydroxybenzophenone compounds, The mixing molar ratio of polyisocyanate compound, polyol compound and catalyst is: dihydroxybenzophenone compound: polyisocyanate compound: polyol compound: catalyst=1:1:2:0.002;

[0031] (2) curing the mixture in step (1), the curing temperature is 60°C, and the curing time is 24 hours to obtain a molded thermally reversible crosslinked polyurethane;

[0032] (3) Soak the formed reversible cross-linked polyurethane in step (2) in an aqueous solution containing photosensitive monomer acrylamide, and then irradiate it under a 365nm, 100W ultraviolet lamp for 5 minutes, and then wash to obtain a surface-modified thermally reversible cross-linked polyurethane. linked polyurethane.

[0033] The tensile self-healing performance, reprocessing performance and surface performance of the...

Embodiment 2

[0038] (1) 2,4-dihydroxybenzophenone, hexamethylene diisocyanate, polylactic acid diol and catalyst triethylamine are mixed to obtain a mixture, and the described dihydroxybenzophenone compounds, polyisocyanates The mixing molar ratio of compound, polyol compound and catalyst is: dihydroxybenzophenone compound: polyisocyanate compound: polyol compound: catalyst=1:1:1.9:0.001;

[0039] (2) curing the mixture in step (1), the curing temperature is 70°C, and the curing time is 24 hours, to obtain a molded thermally reversible crosslinked polyurethane;

[0040](3) Soak the formed reversible crosslinked polyurethane of step (2) in a solution containing photosensitive monomer silane coupling agent KH-570, then irradiate for 5 minutes under 365nm, 100W ultraviolet lamp, and then wash to obtain surface modification Thermoreversible cross-linked polyurethane.

[0041] The tensile self-healing performance, reprocessing performance and surface performance of the polyurethane obtained in...

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Abstract

The invention belongs to the technical field of polyurethane, and particularly relates to a preparation method of thermally reversible cross-linked polyurethane. The method comprises the steps of mixing a dihydroxy benzophenone compound, a polyisocyanate compound, a polyol compound and a catalyst, and curing so as to obtain the thermally reversible cross-linked polyurethane containing a photoinitiator unit. Various different substances can be chemically grafted on the surface of the polyurethane through a solution soaking and ultraviolet irradiation method. By adopting the method, the thermally reversible cross-linked polyurethane which can be repeatedly processed and self-repaired can be prepared, and meanwhile, the thermally reversible cross-linked polyurethane has adjustable surface performance, so that the polyurethane is expected to be used for special self-repairing coatings, medical instruments, intelligent devices and the like, and the problem that the surface modification process of the thermally reversible cross-linked polyurethane in the prior art is complicated is solved.

Description

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Claims

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Application Information

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Owner TSINGHUA UNIV
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