Antibacterial self-repairing microcapsule as well as preparation method and application thereof in coating

A self-healing microcapsule and self-healing technology, which is applied in the direction of microcapsule preparation, microsphere preparation, antifouling/underwater coating, etc., can solve the problems of poor product storage, poor compatibility, and microcapsule agglomeration, and achieve improved storage High stability, reduced agglomeration, and high stability

Active Publication Date: 2021-06-04
三棵树(上海)新材料研究有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when used in coatings, the compatibility between the inorganic silica shell and the main film-forming substances is poor, which may easily cause the aggregation of microcapsules, resulting in poor product storage.
At the same time, the prepared microcapsules have a single function and cannot achieve the composite performance of antibacterial and self-repairing.

Method used

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  • Antibacterial self-repairing microcapsule as well as preparation method and application thereof in coating
  • Antibacterial self-repairing microcapsule as well as preparation method and application thereof in coating
  • Antibacterial self-repairing microcapsule as well as preparation method and application thereof in coating

Examples

Experimental program
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preparation example Construction

[0036] The present invention also provides the preparation method of above-mentioned antibacterial self-healing microcapsules, which comprises the following steps:

[0037] S1 adding the self-healing substance to the emulsifier to obtain a mixture;

[0038] S2 adding the silicon source material to the obtained mixture after being hydrolyzed under acidic conditions to form inorganic microcapsules with an inorganic shell-coated self-healing material;

[0039] S3 Emulsion polymerizing the obtained inorganic microcapsules with acrylic monomers to obtain the antibacterial self-repairing microcapsules.

[0040] Such as figure 1 As shown, the present invention pre-emulsifies the self-healing substance through an emulsifier, and the emulsifier coats the self-healing substance; on this basis, the silicon source material is hydrolyzed to form a hydrolyzate containing vinyl active groups, and the encapsulating The emulsifier covered with the self-healing substance undergoes interfacial...

Embodiment 1

[0048] Preparation of antibacterial self-healing microcapsules:

[0049] Emulsion mixing of S1 self-healing substances

[0050]Under 1500rpm mechanical dispersion, in 100g water, add 4g PF80S (non-ionic emulsifier) ​​to form homogeneous solution; Continue under stirring, and rotating speed is 3000rpm, adds the mixture 100g of epoxy resin E51 and cationic photoinitiator WPI113 (wherein initiator and Resin ratio is 1:20), dispersed at high speed for half an hour to form a uniform emulsified mixture.

[0051] S2 silicon source prehydrolyzate

[0052] Take 20g of ethyl orthosilicate and 10g of vinyltrimethoxysilane and add it to 70g of water under stirring at 250rpm, slowly add dilute hydrochloric acid (mass concentration: 10%) to adjust the pH of the system to 2.0; continue to stir at 40°C for 30min to form a transparent The silicon source hydrolyzate.

[0053] S3 forms inorganic microcapsules

[0054] S31 Slowly drop the silicon source pre-hydrolyzed solution into the emulsi...

Embodiment 2

[0062] The preparation method of antibacterial self-healing microcapsules, the steps and parameters are the same as in Example 1, the difference is that the epoxy resin in step S1 is replaced by E44, and the photoinitiator is WPI113, wherein the weight ratio of the initiator to the resin is 1:5 .

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Abstract

The invention relates to the technical field of antibacterial coatings, in particular to an antibacterial self-repairing microcapsule as well as a preparation method and application thereof in coatings. The antibacterial self-repairing microcapsule comprises a composite shell layer and a self-repairing substance coated in the composite shell layer; and the composite shell layer comprises a silicon dioxide inorganic shell layer and an organic shell layer coated outside the inorganic shell layer. The preparation method comprises the following steps: adding the self-repairing substance into the emulsifier to obtain a mixture; hydrolyzing a silicon source substance under an acidic condition, and then adding the hydrolyzed silicon source substance into the obtained mixture to form an inorganic microcapsule in which the inorganic shell layer coats the self-repairing substance; and carrying out emulsion polymerization on the obtained inorganic microcapsule and an acrylic monomer to obtain the antibacterial self-repairing microcapsule. The microcapsule adopts the composite shell layer of the silicon dioxide inorganic shell layer and the silicon dioxide organic shell layer, so that the microcapsule has better compatibility with a film forming substance in a coating, the phenomenon of agglomeration among microcapsules applied to the coating is reduced, the storage property of the microcapsule is improved, and the stability is high.

Description

technical field [0001] The invention relates to the technical field of antibacterial coatings, in particular to an antibacterial self-repairing microcapsule, a preparation method thereof and an application in coatings. Background technique [0002] With the improvement of people's demand for a healthy life, the role of the coating of household materials is not only decorative, but also puts forward higher requirements for other functions of the coating, such as antibacterial and self-repair after the paint film is damaged. sex. At present, the antibacterial properties of coatings are mainly achieved by adding organic bactericides, some metal salts or metal nanoparticles or other photocatalytic materials. Among them, organic fungicides are generally small molecules, which migrate during use, have poor durability, and are not environmentally friendly. The laws and regulations of many countries have clear restrictions on the amount of organic fungicides; metal salts or nano P...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D5/14C09D7/65C09D7/61B01J13/02
CPCC09D5/14C09D7/65C09D7/61C09D7/70B01J13/02
Inventor 李维亚强志华
Owner 三棵树(上海)新材料研究有限公司
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