Preparation method of cross-linking agent and multi-stimulus-response discoloration self-repairing coating and preparation method thereof

A multi-stimulus-responsive and stimuli-responsive technology, applied in the field of coatings, to achieve the effect of extending service life and wide application range

Active Publication Date: 2019-12-10
WUHAN TEXTILE UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, traditional water-based acrylic emulsions do not have the ability to change color in response to UV light stimuli

Method used

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  • Preparation method of cross-linking agent and multi-stimulus-response discoloration self-repairing coating and preparation method thereof
  • Preparation method of cross-linking agent and multi-stimulus-response discoloration self-repairing coating and preparation method thereof
  • Preparation method of cross-linking agent and multi-stimulus-response discoloration self-repairing coating and preparation method thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0040] The invention provides a kind of preparation method of crosslinking agent, described preparation method is:

[0041] S1, preparation of a stimulus-responsive compound, the compound being a spiropyran derivative with hydroxyl groups at both ends;

[0042] S2, the preparation of cross-linking agent, using the stimuli-responsive compound and isocyanate compound obtained in step S1 to obtain a cross-linking agent under the action of a catalyst, the end group of the cross-linking agent is a double bond, the middle is an amide bond and contains Spiropyran derivatives, the structural formula of the crosslinking agent is as follows:

[0043]

[0044] Wherein, in step S1, the structural formulas of the spiropyran derivatives HO-SP1-OH, HO-SP2-OH, and HO-SP3-OH are respectively:

[0045]

[0046]Wherein, the preparation reaction process of the spiropyran derivative HO-SP2-OH is as follows:

[0047]

[0048] It should be noted that the preparation reaction process of th...

Embodiment 1

[0064] The invention provides a kind of preparation method of crosslinking agent, concrete steps are as follows:

[0065] Preparation of crosslinking agent with spiropyran HO-SP2-OH and isocyanoethyl methacrylate:

[0066] Add dibutyltin dilaurate (DBTDL) to isocyanoethyl methacrylate, then add an organic solution containing bishydroxyspiropyran derivatives, control the reaction temperature at 25°C and the reaction time for 4 hours, and the prepared terminal group is A double bond with an amide bond in the middle and a cross-linking agent containing spiropyran derivatives.

Embodiment 2-3

[0068] Compared with Example 1, the preparation method of the cross-linking agent provided in Example 2-3 is different in that the stimulus-responsive compounds in Step S1 are HO-SP1-OH and HO-SP3-OH, except for the above differences Except, other operations are basically the same and will not be repeated here; the details are shown in the following table.

[0069] project Example 1 Example 2 Example 3 stimuli responsive compounds HO-SP2-OH HO-SP1-OH HO-SP3-OH

[0070] Through experiments, it can be seen that the structural formula of spiropyran derivatives is HO-SP1-OH, HO-SP2-OH or HO-SP3-OH, which can be successfully prepared to obtain double bonds at the end, amide bonds in the middle and spiropyran derivatives the cross-linking agent.

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Abstract

The invention provides a preparation method of a cross-linking agent and a multi-stimulus-response discoloration self-repairing coating and a preparation method thereof. Preparation of the cross-linking agent comprises the steps that S1, a stimulus response compound, that is, a spiropyran derivative with hydroxyl groups at both ends is prepared; S2, a cross-linking agent containing the spiropyranderivative and with an end group as a double bond and the middle as an amide bond is prepared; coating is prepared, specifically, S3, methyl methacrylate, butyl acrylate, initiator and the cross-linking agent obtained in the step S2 are stirred and mixed to obtain an oil phase; and S4, deionized water, emulsifier and neutralizer are mixed and stirred evenly to obtain an oil phase, the water phaseis then mixed with the oil phase obtained in the step S3 to obtain mixed liquid, ultrasonic treatment is performed, and the multi-stimulus-response discoloration self-repairing coating is obtained. The obtained coating has the functions of ultraviolet light-sensitive discoloration and mechanical force-sensitive discoloration. Amide bond structures contained in a polymer can form hydrogen bonds inpairs, the reversible formation-breakage of the hydrogen bonds are used for realizing a self-repairing function of the coating, and the service life of the coating is prolonged.

Description

technical field [0001] The invention relates to the technical field of coatings, in particular to a preparation method of a crosslinking agent, a multi-stimuli-responsive discoloration self-repairing coating and a preparation method thereof. Background technique [0002] With the improvement of the national economic level, human beings' awareness of environmental protection is increasing day by day. Countries have successively formulated environmental protection regulations on the discharge of volatile organic solvents (VOC), and the emission standards have become increasingly strict. The development of water-based coatings complies with the requirements of environmental protection regulations. It greatly reduces the release of VOC in coatings, and water-based acrylic acid is a common component for preparing water-based coatings. [0003] Water-based acrylic emulsion is formed by emulsion polymerization of vinyl monomers mainly based on acrylate monomers. Various additives s...

Claims

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Application Information

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IPC IPC(8): C07D491/107C09K9/02C08F220/14C08F220/18C08F222/22C09D133/12C09D5/29
CPCC07D491/107C09K9/02C08F220/14C09D133/12C09D5/29C09K2211/14
Inventor 王栋王雯雯郑玉竹田时友徐得立李嫚丽赵青华梅涛
Owner WUHAN TEXTILE UNIV
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