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Anti-microcrack coating and preparation method thereof

A micro-crack and coating technology, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the problems of insufficient mechanical strength of the repair structure, and achieve the effect of inhibiting the generation of cracks

Active Publication Date: 2022-07-12
GUANGDONG POWER GRID CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the other hand, most self-healing coatings add self-healing fillers to the coating base material, and the self-healing fillers and coating base material are simply mixed physically, and the mechanical strength of the repaired structure is insufficient.

Method used

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  • Anti-microcrack coating and preparation method thereof
  • Anti-microcrack coating and preparation method thereof
  • Anti-microcrack coating and preparation method thereof

Examples

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Effect test

preparation example 1

[0038] An anti-microcrack prepolymer, comprising the following preparation steps:

[0039] (1) 30g of hydroxyl terminated polydimethylsiloxane (viscosity 3000cSt) was placed in a dry flask, and heated under vacuum at 80°C for 2 hours to remove moisture and gas, and then 5g of isophorone diisocyanate and 0.1 g of stannous octoate was added to the flask, and stirred for 1 h under nitrogen protection to obtain mixture A. The reaction formula is as follows figure 1 shown;

[0040] (2) under the temperature condition of 65 ℃, 5 g of bis(4-hydroxyphenyl) disulfide was dissolved in 50 g of tetrahydrofuran, and then added to the flask containing mixture A, and reacted under nitrogen protection for 30 minutes to obtain anti- Microcracked prepolymer, the reaction formula is figure 2 shown.

[0041] like image 3 The mid-infrared spectrum results show that the peak at 1708cm-1 is the stretching vibration of amide C=O, and the peak at 1532cm-1 belongs to the amide II band, and these ...

preparation example 2

[0044] An anti-microcrack prepolymer, comprising the following preparation steps:

[0045] (1) 50g of hydroxyl terminated polydimethylsiloxane (viscosity 2500cSt) was placed in a dry flask, and heated under vacuum at 65°C for 2 hours to remove moisture and gas, and then 8g of toluene-2,5-dimethicone was added. Isocyanate and 0.5g bis(dodecylsulfide)dibutyltin were added to the flask, and stirred for 2h under nitrogen protection to obtain mixture A;

[0046] (2) under the temperature condition of 80 ℃, dissolve 10 g of 3,3'-dihydroxydiphenyl disulfide in 50 g of tetrahydrofuran, then add it to the flask containing mixture A, and react under nitrogen protection for 40 minutes to obtain Microcrack resistant prepolymer.

preparation example 3

[0048] An anti-microcrack prepolymer, comprising the following preparation steps:

[0049] (1) 40g of hydroxyl terminated polydimethylsiloxane (viscosity 2000cSt) was placed in a dry flask, and heated under vacuum at 70°C for 1 hour to remove moisture and gas, and then 6g of hexamethylene diisocyanate and 0.3 g of dibutyltin diacetate was added to the flask, and stirred for 1 h under nitrogen protection to obtain mixture A;

[0050] (2) Under the temperature condition of 70°C, 8g of 3,3'-dihydroxydiphenyl disulfide was dissolved in 30g of tetrahydrofuran, and then added to the flask containing mixture A, and reacted under nitrogen protection for 60 minutes to obtain Microcrack resistant prepolymer.

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Abstract

The invention discloses an anti-microcrack coating and a preparation method thereof, and relates to the field of coatings. The anti-microcrack coating comprises an anti-microcrack prepolymer, white carbon black, methyl silicone oil and a sulfur-containing silane coupling agent; the preparation method of the anti-microcrack prepolymer comprises the following steps: mixing hydroxyl-terminated polydimethylsiloxane, diisocyanate and an organic tin catalyst to form a mixture A, dissolving hydroxyl disulfide in tetrahydrofuran, then adding into the mixture A, and reacting to obtain the anti-microcrack prepolymer. The anti-microcrack coating has self-repairing capability through the attraction of hydrogen bonds and the reconstruction of disulfide bonds, the anti-microcrack prepolymer and the coating base material are connected together through chemical reaction, a firm three-dimensional network structure can be formed, the whole anti-microcrack coating is formed, and the generation of cracks is inhibited.

Description

technical field [0001] The invention relates to the field of coatings, in particular to an anti-microcrack coating and a preparation method thereof. Background technique [0002] In order to prevent pollution flashover on the outer insulating surface of substation equipment, anti-pollution flashover coatings are often applied. However, with the increase of operating time, the surface of the coating will be aged, and tiny cracks will appear, which will affect the performance of the coating and threaten the safe and stable operation of the power grid. [0003] In terms of preventing micro-cracks on the surface of coatings, relevant researchers have prepared self-healing coatings to self-repair micro-cracks. At present, in terms of overcoming micro-cracks on the surface, related technical means achieve the effect of repairing cracks through metal coordination bonds, hydrogen bonds, hydrophilic-hydrophobic interactions, imine bonds / acylhydrazone bonds, boronate bonds and disulf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/65C08G18/61C08G18/32C09D175/04C09D7/61C09D7/63
CPCC08G18/65C08G18/61C08G18/3855C09D175/04C09D7/61C09D7/63C08K7/26C08K5/548
Inventor 彭磊李智付强林木松吴丽
Owner GUANGDONG POWER GRID CO LTD
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