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Preparation method of anticorrosive coating capable of self-repairing rapidly at room temperature

An anti-corrosion coating and self-healing technology, applied in anti-corrosion coatings, microsphere preparation, epoxy resin coatings, etc., can solve problems such as unsatisfactory repair effect and weak micro-crack capillary siphon effect, and increase repair efficiency and production cost. Low, simple process effect

Active Publication Date: 2014-05-14
SHENYANG SHUNFENG NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If a double-wall sandwich structure is used to coat the epoxy resin curing agent on the surface of the epoxy resin microcapsules, although the contact probability between the catalyst and the repair agent is increased, the micro-crack capillary siphon effect of the material itself is not strong, making the double-wall The two-layer wall material of the microcapsules is unlikely to be completely broken, and the repair effect is not ideal.

Method used

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  • Preparation method of anticorrosive coating capable of self-repairing rapidly at room temperature
  • Preparation method of anticorrosive coating capable of self-repairing rapidly at room temperature
  • Preparation method of anticorrosive coating capable of self-repairing rapidly at room temperature

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preparation example Construction

[0022] The preparation process of the method of the present invention: Weigh 1-10 parts of nanometer mesoporous silica particles, add 1-5 parts of dispersant and mix evenly; add 5-10 parts of solvent, 0-10 parts of dibutyl phthalate , in a mixture of 60-100 parts of film formers; after grinding and dispersing for 30-90 minutes at normal temperature and pressure, add 1-10 parts of double-walled microcapsules to make a paint mother liquor; the prepared mother liquor is used in the same way as ordinary paint , the mother liquor is mixed with the curing agent, and brushed to make a coating. The self-healing microcapsules with double-wall sandwich structure are made of repairing agent (epoxy resin and its diluent) as the inner layer core material, urea-formaldehyde resin as the inner layer wall material, polythiol type curing agent as the outer layer core material, and urea-formaldehyde resin as the outer layer core material. Outer wall material. The film former is bisphenol A or ...

Embodiment 1

[0026] (1) Using in-situ polymerization to prepare single-wall microcapsules coated with epoxy resin by urea-formaldehyde resin by a two-step synthesis method;

[0027] (2) Synthesis of self-healing microcapsules with double-wall sandwich structure: Mix epoxy resin room temperature rapid curing agent polythiol type curing agent with single-coated microcapsules at a mass ratio of 1:3~1 in a small beaker. Add 80ml of deionized water, 0.45g of curing agent resorcinol, 0.45g of pH regulator ammonium chloride, 1~2 drops of defoamer n-octanol, a certain quality of emulsifier and urea into the diluted epoxy resin disperse for about 30 minutes at an emulsification speed of 6000~10000r / min to form a stable oil-in-water (O / W) emulsion, transfer the emulsion to a three-necked bottle, add a certain amount of formaldehyde, and adjust the initial pH of the system with dilute hydrochloric acid The value is about 3, the temperature of the water bath is raised slowly, and the temperature o...

Embodiment 2

[0029] Coating formula: (weight percentage meter)

[0030] Nano-mesoporous silica particles: 5 parts (particle size is 60~80nm);

[0031] Dispersant: 0.5 parts;

[0032] Dibutyl phthalate: 5 parts;

[0033] Xylene: 20 parts;

[0034] 10 parts of double-walled microcapsules;

[0035] Epoxy (using E-44): balance.

[0036] Its dispersant composition (weight percent):

[0037] Sodium oleate 10%;

[0038] Disperbyk-160 80%;

[0039] Toluene 10%;

[0040] The dispersant is prepared by first mixing sodium oleate and toluene at 25 °C and 1 atm to fully dissolve sodium oleate in toluene, then slowly adding the Disperbyk-160 component and mixing evenly.

[0041] Coating preparation method:

[0042] Weigh 5 parts of nanometer mesoporous silica powder, mix it evenly with the dispersant, add it to the epoxy resin mixed with other additives, grind and disperse for 30 minutes at normal temperature and pressure, and add 10 parts The double-walled microcapsules were used to prepare...

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Abstract

The invention discloses a preparation method of an anticorrosive coating capable of self-repairing rapidly at room temperature, relating to a preparation method of an anticorrosive coating. According to the method, urea resin is taken as a wall material. A microcapsule repairing agent is high in coating rate and high in possibility of contact with a catalyst. A polythiol curing agent is taken as an outer layer core material, so that the effect of rapidly repairing cracks at room temperature can be achieved. By applying nano titanium dioxide with special photocatalytic performance, super hydrophobicity and ultraviolet ray shielding performance to the coating and keeping the nano titanium dioxide in a nanoscale state in the coating, the defects of poor weather resistance, easiness in staining and the like of an existing coating can be overcome, and the siphon action on micro cracks is improved since the nano titanium dioxide is porous. By adding self-repairing microcapsules into a mesoporous molecular sieve and a double-wall sandwich structure, the self-repairing performance of the coating is remarkably improved, the self-repairing time is shortened, and excellent corrosion resistance is realized.

Description

technical field [0001] The invention relates to a preparation method of an anti-corrosion coating, in particular to a preparation method of a rapid self-repairing anti-corrosion coating at room temperature. Background technique [0002] Metal corrosion is the result of chemical or electrochemical reactions between the surface of the metal and the medium in the surrounding environment from the surface to the inside, causing the metal to be damaged and lose its original properties. However, due to the influence of external environmental factors such as physical shock, temperature alternation, and aging, the current coatings are prone to form microcracks on the surface and inside of the coating during long-term use. Micro-cracks are the starting point of coating performance degradation. The development of micro-cracks will lead to the formation of cracks, and the gradual extension of cracks will expose the metal surface to the moisture and oxygen environment of the air, which ...

Claims

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Application Information

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IPC IPC(8): C09D163/00C09D7/12C09D5/08B01J13/18B01J13/20
Inventor 王娜吴于虎亢萍
Owner SHENYANG SHUNFENG NEW MATERIAL CO LTD
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