Epoxy-resin curing agent and preparation method thereof

A technology of epoxy resin curing and phenolic resin, which is applied in the direction of epoxy resin coatings and coatings, can solve the problems of inability to prevent corrosion, affect the performance of the coating film, and unstable performance of the coating film, so as to avoid high toxicity Harm to the human body, increase resistance, and increase the effect of cross-linking density

Inactive Publication Date: 2014-10-29
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Epoxy phenolic resin 214 coatings also have significant defects: for strong acidic foods and high-protein foods below pH 3.5, corrosion cannot be prevented; since the coating contains thermosetting phenolic resin, there is a part of phenolic resin in the curing process. The resin will self-cure and affect the performance of the coating film; when the thermosetting phenolic resin used has not been etherified with alcohols, its compatibility with epoxy resin is very poor, and the coating is easy to delaminate, resulting in a cured coating film Problems such as unstable performance have always existed

Method used

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  • Epoxy-resin curing agent and preparation method thereof
  • Epoxy-resin curing agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] First, put 68.4g of bisphenol A and 1.29g of p-toluenesulfonic acid into a 500ml four-neck round bottom flask equipped with a stirrer, thermometer, water separator and reflux condenser, and add 200ml of solvent methyl iso Butyl ketone, stirred and warmed to 100°C until dissolved. Use constant pressure dropping funnel to slowly add the benzaldehyde of 21.3g in 1 hour, and keep 100 DEG C to react, be warming up to 120 DEG C subsequently, continue reaction 5 hours. The water generated by the reaction was discharged through the water separator. The material is discharged, washed with water, and desolvated under reduced pressure to obtain a reddish-brown solid resin.

Embodiment 2

[0045] First, put 68.4g of bisphenol A and 1.29g of p-toluenesulfonic acid into a 500ml four-neck round bottom flask equipped with a stirrer, thermometer, water separator and reflux condenser, and add 200ml of solvent methyl iso Butyl ketone, stirred and warmed to 100°C until dissolved. Add 2.45g p-Hydroxybenzaldehyde every 6 minutes in 1 hour, add 24.52g altogether, and keep 100 DEG C to react, be warming up to 120 DEG C subsequently, continue reaction 5 hours. The water generated by the reaction was discharged through the water separator. The material is discharged, washed with water, and desolvated under reduced pressure to obtain a reddish-brown solid resin.

Embodiment 3

[0047]First, put 68.4g of bisphenol A and 2.064g of p-toluenesulfonic acid into a 500ml four-neck round bottom flask equipped with a stirrer, thermometer, water separator and reflux condenser, and add 300ml of solvent methyl iso Butyl ketone, stirred and warmed to 100°C until dissolved. Add 1.83g p-Hydroxybenzaldehyde every 6 minutes in 2 hours, add 36.6g altogether, and keep 100 DEG C to react, be warming up to 120 DEG C subsequently, continue reaction 4 hours. The water generated by the reaction was discharged through the water separator. The material is discharged, washed with water, and desolvated under reduced pressure to obtain a reddish-brown solid resin.

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Abstract

The invention belongs to the field of epoxy phenolic coatings, and concretely relates to an epoxy-resin curing agent and a preparation method thereof. The curing agent is formed through polymerization reaction of bisphenol A and benzaldehyde or p-hydroxybenzaldehyde under catalysis of a catalyst. A cured coating layer overcomes the disadvantages of vulcanization resistance and insufficient adhesiveness of conventional resin applied as a food tank inner coating, and also the curing agent has good compatibility with epoxy resin and excellent heat resistance. The related multifunctional phenolic-resin curing agent is simple in production technology, the product is relatively pure, and the preparation method all employs domestic raw materials, and is low in cost.

Description

technical field [0001] The invention belongs to the field of epoxy phenolic paint, and in particular relates to an epoxy resin curing agent and a preparation method thereof. Background technique [0002] There are many curing methods for epoxy coatings (TW201137024, JP2002102793), mainly including epoxy amino and epoxy phenolic coatings, and the curing agents mainly include two categories: amino curing agent CN1103650, phenolic curing agent CN1252412, Usually through the structural design of the curing agent to meet the needs of different end uses CN1298913. [0003] Metal food packaging containers often need to be coated with a layer of epoxy coating on the inner wall of the tank to ensure the quality of the contents during the storage period, and at the same time prevent the corrosion that occurs when the metal and food are in contact. At the same time, it is used as a food can The internal coating also needs better adhesion performance to meet a certain stamping deformat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G59/62C08G8/04C09D163/04
Inventor 谢龙魏军胜陈红星
Owner BAOSHAN IRON & STEEL CO LTD
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