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Rust-containing coating curing agent and preparation method thereof

A curing agent and coating technology, used in chemical instruments and methods, preparation of organic compounds, preparation of carboxylic acid amides, etc., can solve problems such as health hazards of workers, floating rust, etc. Conducive to the effect of low requirements on construction and curing conditions

Inactive Publication Date: 2012-11-21
上海经天新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In surface treatment, it takes a lot of manpower and material resources to remove rust, and the floating and flying of rust in the process of rust removal is one of the factors that cause serious health hazards to workers.

Method used

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  • Rust-containing coating curing agent and preparation method thereof
  • Rust-containing coating curing agent and preparation method thereof
  • Rust-containing coating curing agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] In the 500ml four-necked reaction flask that is equipped with stirrer, condenser, thermometer, dropping funnel and nitrogen pipe, add 340 grams of gallic acid, constantly stir and pass into N 2 React under air, drop 120 grams of diaminoethane at a temperature of 35 ° C, keep the temperature at 30 ° C after the dropwise addition, then add 163 grams of 37% formaldehyde solution dropwise, after the dropwise addition, heat up to 81 ° C , keep warm for 4 hours, add the chain terminator acrylonitrile, dehydrate under reduced pressure, the theoretical dehydration amount is 36 grams, the actual dehydration amount is 32 grams, and the product A is obtained by cooling and collecting; the amine value of product A=461, the active hydrogen equivalent on the amine group 81.

Embodiment 2

[0028] The operation method is the same as in Example 1, and the raw materials are input: 340 grams of gallic acid, 149 grams of diaminopropane, and 163 grams of 37% formaldehyde solution to obtain product B. The amine value of product B=432, and the active hydrogen equivalent on the amine group is 86.

Embodiment 3

[0030] The operation method is the same as in Example 1, and the raw materials are input: 340 grams of gallic acid, 176 grams of diaminobutane, and 163 grams of 37% formaldehyde solution to obtain product C. The amine value of product C=415, and the active hydrogen equivalent on the amine group is 90.

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Abstract

The invention relates to the technical field of a rust-containing coating curing agent and a preparation method of the rust-containing coating curing agent. The rust-containing coating curing agent is prepared through a mannich reaction with gallic acid or a derivative of the gallic acid, formalin and aliphatic diamine served as starting materials; the rust-containing coating curing agent comprises a compound (1) with the structural formula in the description, wherein R is alkyl. According to the rust-containing coating curing agent, the gallic acid is a regenerating type plant resource, and the generated curing agent has the structures of amide and amino, and can be transplanted on the prepared curing agent, so that the curing agent has the function of acting with rust; moreover, the epoxy resin also can be cured into a film so as to form a great three-dimensional network structure at temperature below 0 DEG C; and the rust-containing coating curing agent has a long service life and is beneficial to construction, so that he whole system has an outstanding corrosion resistance performance, and the treatment on the surface of the steel is reduced, and the health burden of a worker is reduced; and the rust-containing coating curing agent can be widely applied to various anticorrosive paints of epoxy resin.

Description

technical field [0001] The invention relates to the technical field of a coating curing agent with rust and a preparation method thereof. Background technique [0002] Among the existing room temperature curing epoxy resin curing agents, there has not been a variety that can directly react with the rust in the substrate. Because rust is one of the main causes of severe corrosion of steel products, the rust on the surface must be removed before painting to make the anti-corrosion coating play its due role. And in surface treatment, rust removal needs to spend a lot of manpower and material resources, and the floating of rust in the rust removal process is one of the factors that cause serious health hazards to workers. Therefore be badly in need of developing a kind of coating curing agent with rust. [0003] The gallic acid compound molecule contains more adjacent hydroxyl groups, which can chemically react with Fe+3 in the rust on the metal substrate to form a black and s...

Claims

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Application Information

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IPC IPC(8): C09D7/12C09D163/00C08G59/62C07C237/34C07C231/14
Inventor 刘听
Owner 上海经天新材料科技有限公司
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