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Automobile anticorrosive coating with self-recovery function and application thereof

A self-healing and self-healing microcapsule technology, applied in anti-corrosion coatings, layered products, synthetic resin layered products, etc., can solve the problems of microcapsule rupture, instability, high price, etc. Integrity, the effect of increasing toughness

Inactive Publication Date: 2012-03-28
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent Nos. CN101659719A, US6518330, and US7108914 disclose self-healing microcapsules. The contact between the core material and the catalyst released when it breaks is random, and the core material cannot be polymerized completely, which reduces the self-healing efficiency of the material and increases the self-healing material. The difficulty of preparation; at the same time, the source of highly active catalysts is narrow, expensive, unstable, and easily deactivated by environmental influences
In addition, the microcapsules are directly added to the coating system before construction, because the microcapsules are directly in contact with the metal substrate, which will affect the adhesion of the coating; at the same time, the performance of the microcapsules will be affected by the solvent in the coating. Due to the high pressure, it may cause the rupture of the microcapsules and affect the performance of the coating.

Method used

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  • Automobile anticorrosive coating with self-recovery function and application thereof
  • Automobile anticorrosive coating with self-recovery function and application thereof
  • Automobile anticorrosive coating with self-recovery function and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Spray a layer of phenolic resin primer (wet film thickness is about 150 μm) on the surface of the metal substrate with an air spray gun; self-healing microbes with a core material of tung oil, a core-to-wall ratio of 1:1, and an average particle size of 26.25 μm The capsules are evenly dispersed on the primer; after drying completely, use an air spray gun to spray a layer (wet film thickness of about 150 μm) of phenolic resin intermediate paint; after curing is complete, spray another layer (wet film thickness of about 150 μm) of amino Resin finish.

[0032] Among them, the phenolic resin primer is provided by Shanghai Zhenhua Paint Factory, model F01-2; the amino resin topcoat is provided by Shanghai Zhenhua Paint Factory, model A01-1.

[0033] Self-healing microcapsules were prepared as follows: Dissolve 0.78g of emulsifier OP-10 and 5 g of urea in 260 ml of deionized water; adjust the pH of the solution to 2.50 and acidify for 90 min; add 0.05 g of defoamer n-octanol...

Embodiment 2

[0035] Use an air spray gun to spray a layer of epoxy resin primer on the surface of the metal substrate (wet film thickness is about 200 μm); the core material is linseed oil, the core-to-wall ratio is 2:1, and the average particle size is 20.28 μm. The repair microcapsules are evenly dispersed on the primer; after drying completely, use an air spray gun to spray a layer of epoxy resin intermediate paint (wet film thickness is about 200 μm); after curing is complete, spray another layer (wet film thickness is about 200 μm) μm) acrylic topcoat.

[0036] Dissolve 0.97 g of emulsifier sodium dodecylbenzenesulfonate and 5 g of urea in 260 ml of deionized water; adjust the pH of the solution to 3.00 and acidify for 120 min; add 0.1 g of defoamer n-octanol; Under the condition of rpm, 19.38 g of linseed oil was added and emulsified for 30 min to form a stable emulsion; 4.69 g of formaldehyde was added under mechanical stirring at 70°C and reacted for 4 h; Capsule product.

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Abstract

The invention provides an automobile anticorrosive coating with a self-recovery function and application thereof and belongs to the field of automobile anticorrosive materials. In the automobile anticorrosive coating, self-recovery microcapsules are uniformly dispersed between an intermediate coat and a primer of an automobile coating so as to form the anticorrosive coating, of which the structure is similar to a sandwidge structure. Microcracks can be easily formed in the automobile coating due to influence of factors such as physical impact, temperature change, aging and the like on the automobile coating during long-time use; the self-recovery microcapsules embedded in the coating are damaged by an outer force; released core materials can directly generate crosslinking polymerization reaction with oxygen in the air without catalyst so as to recover the microcracks to prevent further corrosion on the metallic surface; and the automobile anticorrosive coating can be widely applied to self-recovery of automobile industrial anticorrosive coatings.

Description

technical field [0001] The invention belongs to the field of automobile anticorrosion materials, in particular to an automobile anticorrosion coating film with self-repairing function used in the automobile industry and a preparation method thereof. Background technique [0002] The coating film is also called the paint film. Paint is a solid continuous film formed by one or more coats applied to a substrate. Usually, the coating film is composed of multiple coats, generally including a primer layer, an intermediate coat layer and a top coat layer. The coating film reflects the effect of the supporting use of the coating. The automobile industry plays an important role in the economic development of developed countries. According to the construction process, automotive coatings can be divided into: primer, primer, paint (surfacer), top coat, finish paint, etc. During the long-term use of automobile coatings, due to the influence of physical shock, temperature changes, ag...

Claims

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Application Information

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IPC IPC(8): B32B27/06B32B27/38B32B33/00C09D5/08
Inventor 鄢瑛梅燕张会平
Owner SOUTH CHINA UNIV OF TECH
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