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Organic-inorganic hybrid epoxy resin curing agent as well as preparation method and application thereof

A technology of epoxy resin curing and epoxy varnish, applied in epoxy resin coatings, organic chemistry, chemical instruments and methods, etc., can solve the problems of cumbersome operation, high safety risk, harsh conditions, etc., and achieve good storage stability, The effect of single process and mild reaction conditions

Pending Publication Date: 2020-11-10
CHONGQING SANXIA PAINTS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example: organic carboxylic acid, acid anhydride curing agent, and polyamide curing agent contain ester bonds, and their intolerance to alkaline media is their shortcoming; aliphatic amine curing agents have strict requirements on the curing conditions during use. It is relatively strict, and it is difficult to meet the requirements for environmental temperature and humidity. The appearance and performance of the paint film are often greatly affected by the construction conditions; polyurethane curing agents not only have fine requirements for the production raw materials and processes of the two components, but also often have strict requirements for the second process. The construction of the coating is greatly affected, and the bottoming phenomenon usually occurs
At the same time, the paint base prepared by traditional epoxy resin curing agent needs to be stirred continuously during the application period to make it uniform. Construction gun blocking, uneven appearance of the paint film, paint film blooming, etc.
Moreover, the operation of traditional epoxy resin curing agents is cumbersome, the conditions are harsh, the safety risk is high, and the environmental pollution is serious

Method used

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  • Organic-inorganic hybrid epoxy resin curing agent as well as preparation method and application thereof
  • Organic-inorganic hybrid epoxy resin curing agent as well as preparation method and application thereof
  • Organic-inorganic hybrid epoxy resin curing agent as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Weigh 780 grams of tetraethyl orthosilicate and 1220 grams of dimethylethanolamine into the reaction kettle, control and slowly heat to 120±2°C over 3 hours, and keep the temperature for 10 hours. The temperature is lowered to below 80°C, and the epoxy resin curing agent of the present invention is obtained immediately after being taken out of the pot.

Embodiment 2

[0028] Weigh 740 grams of tetraethyl orthosilicate and 1260 grams of dimethylethanolamine into the reaction kettle, control and slowly heat to 115° C. over 3 hours, and keep the temperature for 12 hours. The temperature is lowered to below 80°C, and the epoxy resin curing agent of the present invention is obtained immediately after being taken out of the pot.

Embodiment 3

[0030] Weigh 820 grams of tetraethyl orthosilicate and 1180 grams of dimethylethanolamine into the reaction kettle, control and slowly heat to 130° C. over 3 hours, and keep the temperature for 8 hours. The temperature is lowered to below 80°C, and the epoxy resin curing agent of the present invention is obtained immediately after being taken out of the pot.

[0031] The color, appearance and solid content test results of the epoxy resin curing agent of the present invention are shown in Table 1 below, wherein the solid content test conditions are as follows: 1 gram of sample is weighed and baked at 105° C. for 30 minutes.

[0032] Table 1 epoxy resin curing agent color of the present invention and appearance and solid content detection result

[0033] Example 1 Example 2 Example 3 color and appearance Water white transparent viscous liquid Water white transparent viscous liquid Water white transparent viscous liquid Solid content (%) 68.2 68.0...

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Abstract

The invention provides an organic-inorganic hybrid epoxy resin curing agent. Through the interaction of tetraethoxysilane and dimethylethanolamine, an inorganic component chain segment with a silicon-oxygen-silicon structure is formed and surrounded by an organic component taking dimethylethanolamine as an end structure, and a special form of organic-inorganic hybrid in molecules is represented. The preparation method of the epoxy resin curing agent is simple, no water participates in the reaction process, the reaction conditions are mild, no waste is generated or discharged, energy conservation and emission reduction are embodied, and meanwhile, the safety risk of the production process is reduced. When the curing agent is used for curing epoxy resin paint, the characteristic that an epoxy resin paint film is particularly excellent in acid resistance, alkali resistance and salt resistance are represented; meanwhile, paint slurry prepared from the curing agent is good in storage stability, and precipitation, gun blockage, uneven paint film appearance, paint film blooming and other unhealthy phenomena are aovided in the working period.

Description

technical field [0001] The invention relates to an epoxy resin curing agent, in particular to an organic-inorganic hybrid epoxy resin curing agent and its preparation method and application, and belongs to the technical fields of chemical organic synthetic materials and chemical technology. Background technique [0002] Epoxy resins are widely used in the bonding of various metals and non-metals, coatings, electrical insulation materials, glass fiber reinforced plastics / composites, and casting potting materials. However, epoxy resin is a thermoplastic linear resin, which cannot undergo crosslinking reaction itself. Only after adding a curing agent, a cured product with a three-dimensional network structure (body-shaped network structure) is generated, and the epoxy resin can be used in practice. The choice of curing agent is very important to make epoxy resin and curing agent fully mixed and fully cured to form a dense and uniform cured film. There are many kinds of epoxy ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G59/50C07F7/18C09D163/00
CPCC08G59/504C07F7/188C09D163/00
Inventor 邓贤均
Owner CHONGQING SANXIA PAINTS CO LTD
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