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Coating composition and method for controlling speed of cross-linking reaction thereof

A composition and coating technology, applied in the direction of coating, etc., can solve the problem of high activation energy, achieve the effects of expanding the application range, solving the problem of short construction time and excellent storage stability

Pending Publication Date: 2022-05-13
NIPPON PAINT CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the activation energy of the traditional cross-linked one-component system is relatively high, and the reaction can only occur at temperatures above 120°C to 140°C.

Method used

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  • Coating composition and method for controlling speed of cross-linking reaction thereof
  • Coating composition and method for controlling speed of cross-linking reaction thereof
  • Coating composition and method for controlling speed of cross-linking reaction thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 4

[0081] Embodiment 4 prepares coating composition 4

[0082] First synthesize the main resin PE-1001. React 25.75g of ε-caprolactone, 0.64g of stannous isooctanoate, 1.96g of 1,2 propylene glycol and 25.00g of xylene in an oil bath at 140°C for 24 hours. After testing the residual acid value < 5, cool to obtain PE-1001 resin. The hydroxyl ortho position of the main resin PE1001 has methyl steric hindrance.

[0083] Coating composition 4 was prepared by mixing 63.0 g of PE-1001 resin, 23.0 g of crosslinker isocyanate Desmodur N 3300, 13.3 g of butyl acetate, 0.2 g of BYK-306, and 0.5 g of DBTDL at room temperature for 30 minutes. The coating composition 4 is a two-component system.

[0084] Use a 150um scraping rod to coat the coating composition 4 on the substrate, and bake at 80°C for 30 minutes to obtain the paint film of the coating composition 4.

Embodiment 5

[0085] Embodiment 5 prepares coating composition 5

[0086] First synthesize the main resin PE-1005. React 25.75g of ε-caprolactone, 0.64g of stannous isooctanoate, 3.05g of 1,2 hexanediol and 25.00g of xylene in an oil bath at 140°C for 24 hours. After testing the residual acid value <5, cool to obtain PE- 1005 resin. The hydroxyl ortho position of the main body resin PE1005 has n-pentyl steric hindrance.

[0087] Coating composition 5 was prepared by mixing 63.0 g of PE-1005 resin, 23.0 g of crosslinker isocyanate Desmodur N 3300, 13.3 g of butyl acetate, 0.2 g of BYK-306, and 0.5 g of DBTDL at room temperature for 30 minutes. The coating composition 5 is a two-component system.

[0088] Use a 150um scraping bar to coat the coating composition 5 on the substrate, and bake at 80°C for 30 minutes to obtain the paint film of the coating composition 5.

Embodiment 6

[0089] Embodiment 6 prepares coating composition 6

[0090] First prepare the blocked cross-linking agent BIT-50, the steps are as follows:

[0091] (1) 50g isocyanate trimer, 18g cyclohexanone, 20g xylene, 25g methyl ethyl ketone, 0.3g DBTDL, to generate isocyanate solution. Wherein, the isocyanate-containing trimer may be one or more selected from HDI trimer, TDI trimer, MDI trimer, and IPDI trimer.

[0092] (2) Heat the above-mentioned isocyanate solution to 45°C, and gradually add the blocking agent dropwise at a speed of 500 to 800 rpm, keeping the ratio of the hydroxyl group of the blocking agent and the NCO group of the isocyanate in the range of 1:1 to 3:1, and the blocking agent is kept for 2 hours. After dripping, keep the temperature for 0.5h and then slowly raise the temperature to 70-75°C;

[0093] Wherein, the blocking agent can be selected from methyl ethyl ketone oxime, acetone oxime, 3,5-dimethylpyrazole, 2-methylimidazole, acetylacetone, ethyl acetoacetat...

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Abstract

According to the coating composition and the method for controlling the cross-linking reaction speed of the coating composition, the composition and the method provide a single-component cross-linking system suitable for the coating, the low-temperature cross-linking requirement of the coating is met, meanwhile, the excellent storage stability can be particularly provided, the storage requirement of the single-component system is met, and the coating composition is suitable for being used for the coating. The problems that the construction time limit is short after a traditional two-component system is mixed and a traditional single-component system needs high-temperature baking crosslinking are solved.

Description

technical field [0001] The invention relates to the field of coatings. In particular, the present invention relates to a coating composition and a method of controlling the rate of its crosslinking reaction. Background technique [0002] According to the packaging composition, coatings can generally be divided into two-component systems and one-component systems. One of the components of a typical two-component system contains a curable resin, and the other component contains a crosslinking agent for the curable resin. When used, the resin (main agent) and the crosslinking agent are fully mixed, and then for construction. However, there are several problems in the two-component system. Due to the inaccuracy of the content of each component or the reaction rate is too fast, it will lead to incomplete or too fast curing, and the main agent and crosslinking may occur just after mixing. Due to the cross-linking reaction of the agent, it cannot be stored for a long time, and t...

Claims

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Application Information

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IPC IPC(8): C09D123/06C09D7/63C08J3/24
CPCC09D123/06C09D7/63C08J3/24C08J2323/06C08K5/29C08K5/053
Inventor 徐嘉希夏云卢俊彪
Owner NIPPON PAINT CHINA
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