Environment-friendly cashew amine epoxy curing agent for low volatile organic compound (VOC) anticorrosive coating and preparation method for curing agent

Abstract

The invention discloses an environment-friendly cashew amine epoxy curing agent for a low volatile organic compound (VOC) anticorrosive coating and a preparation method for the curing agent. The curing agent is prepared from the following raw materials in parts by weight: 1.5 to 2.5 parts of cardanol, 1 to 1.5 parts of diethylenetriamine, and 1.5 to 2 parts of 37 percent formaldehyde aqueous solution. The raw material composition and the optimal proportion of the raw materials are selected through a large quantity of experiments, so that the proportion of each component is scientific and reasonable. The curing agent synthesized by adopting excessive amine and a low-temperature reaction method is high in activity, low in viscosity, good in mixing property, light in color, oil-free, convenient in construction, environment-friendly and solvent-free, can meet various requirements of low VOC anticorrosion, and can overcome many defects of the cashew amine epoxy curing agent prepared by the method in the prior art.

Description

technical field [0001] The invention relates to an epoxy curing agent, in particular to an environmentally friendly cashew amine epoxy curing agent for low-VOC anticorrosion coatings. Background technique [0002] Cashew amine epoxy curing agents for environment-friendly anti-corrosion coatings, such as solvent-free floor coatings, pipeline and storage tank inner wall coatings, etc., often need to meet the requirements of solvent-free and low viscosity, but the cashew amine epoxy curing agents prepared by the prior art have not It can well meet the requirements of low VOC anticorrosion, and in the preparation of cashew amine epoxy curing agent in the prior art, there are two kinds of aqueous solutions of polyformaldehyde and 37% formaldehyde that are often used as bridge substrates. The cashew amine epoxy curing agent prepared by using paraformaldehyde as a bridge has good application performance, but because paraformaldehyde is a solid, the local reaction is too fast after ...

AI Technical Summary

Problems solved by technology

[0002] Cashew amine epoxy curing agents for environment-friendly anti-corrosion coatings, such as solvent-free floor coatings, pipeline and storage tank inner wall coatings, etc., often need to meet the requirements of solvent-free and low viscosity, but the cashew amine epoxy curing agents prepared by the prior art have not It can well meet the requirements of low VOC anticorrosion, and in the preparation of cashew amine epoxy curing agent in the prior art, there are two kinds of aqueous solutions of polyformaldehyde and 37% formaldehyde that are often used as bridge substrates.

The cashew amine epoxy curing agent prepared by using paraformaldehyde as a bridge has good application performance, but because paraformaldehyde is a solid, the local reaction is too fast after dissolution, resulting in a high viscosity product and a wide relative molecular weight distribution. It needs to be preheated to about 60oC, resulting in a darker product color

However, the cashew amine epoxy curing agent prepared by using 37% formaldehyde aqueous solution as a bridge often has the problem of easy oil and foaming.

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