Preparation method of microcapsules for self-healing electrophoretic coatings

A technology for electrophoretic coatings and microcapsules, which is applied to electrophoretic coatings, microcapsule preparations, microsphere preparation, etc., can solve the problems of unfavorable capillary siphon effect, failure to achieve self-healing effect, rough surface of microcapsules, etc., and achieve high strength , good shape, smooth surface effect

Active Publication Date: 2018-08-28
ANHUI LINGYANG NEW MATERIAL CO LTD
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  • Summary
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  • Application Information

AI Technical Summary

Problems solved by technology

However, in the process of in-situ polymerization, the viscosity of the emulsion is too high, which causes the adhesion between the microcapsules, and the surface of the microcapsules is damaged, resulting in problems such as rough surface of the microcapsules, poor stability, and uneven particle size distribution; The capsule core in the capsule has a high viscosity during the repair process, which is not conducive to the occurrence of capillary siphon effect, so that the self-healing effect cannot be achieved

Method used

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Embodiment 1

[0021] A preparation method of microcapsules for self-healing electrophoretic coatings, comprising the following steps:

[0022] (1) SiO 2 Solution preparation:

[0023] Weigh a certain amount of silane coupling agent, SiO 2 , 95% ethanol and absolute ethanol were mixed evenly, and ultrasonically oscillated for 30 minutes, then the mixed solution was transferred to a water bath, stirred at a constant temperature and speed at 55°C for 4 hours, after natural cooling, the obtained mixed solution was centrifuged to remove the supernatant, and the obtained Colloidal SiO 2 ready to use after hydrolysis;

[0024] The consumption of described silane coupling agent is 8%;

[0025] (2) Preparation of urea-formaldehyde resin prepolymer:

[0026] At room temperature, add 5.5g of urea and 12g of formaldehyde solution with a mass fraction of 37% to a three-necked flask for mixing and stirring. When the urea is dissolved, add an appropriate amount of triethanolamine to adjust the pH val...

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Abstract

The invention discloses a preparation method of microcapsules for self-healing electrophoretic coatings. A gelatin modified urea-formaldehyde resin is added as capsule walls, thereby improving the flexibility of the surfaces of the self-healing microcapsules, and the obtained microcapsules have the characteristics of high morphology, smooth surface, compact structure and higher strength. SiO2 is grafted onto the surfaces of the urea-formaldehyde resin capsule walls after the surface of the SiO2 is treated with a silane coupling agent, so that SiO2 layers formed on the surfaces of the microcapsules have high barrier property and strength, the occurrence of the microcapsule adhesion phenomenon is reduced, and the prepared microcapsules have high stability and are uniform in particle size distribution. In the microcapsules prepared with the method, an n-butyl glycidyl ether solvent is added into capsule cores, so that modified epoxy resin capsule cores are well diluted. According to the principle of siphon effect, an epoxy resin solution can fully permeate through damaged parts of a whole film along an aperture and undergo a crosslinking and curing reaction, thus achieving a self-healing effect.

Description

technical field [0001] The invention belongs to the technical field of paint preparation, and in particular relates to a preparation method of microcapsules for self-healing electrophoretic paint. Background technique [0002] Cathodic electrophoretic coating is a kind of anti-corrosion coating developed in the mid-1970s. Compared with anodic electrophoretic coating, it has better performance in terms of throwing power and corrosion resistance, and has been applied industrially. During the production or use of the workpiece, problems such as bumps and scratches inevitably occur, which greatly reduces the protective function of the paint and affects the overall anti-corrosion performance of the paint film. Therefore, it is necessary to increase the self-healing ability of the paint film. [0003] In recent years, the application of microcapsules in self-healing materials has become a research hotspot. The advantage of microcapsule technology is that the capsule core can be w...

Claims

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Application Information

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IPC IPC(8): B01J13/14C09D5/44C09D7/62C08G14/08C08K3/36
CPCB01J13/14C08G14/08C08K3/36C09D5/448
Inventor 刘玉胡强陈小琴
Owner ANHUI LINGYANG NEW MATERIAL CO LTD
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