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Compound type epoxy curing agent applied to heavy anti-corrosion coating and preparation method

An epoxy curing agent and composite technology, applied in the direction of anti-corrosion coatings, epoxy resin coatings, coatings, etc., can solve the problems of brittle paint film, phase separation and migration, difficult to cure, etc., and achieve good chemical corrosion resistance, good Excellent performance, fast drying time

Active Publication Date: 2017-08-01
江苏三木化工股份有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Due to the limitation of the structural characteristics of the curing agent, the use of a single curing agent cannot meet all performance requirements
For example, modified aromatic amine curing agent has excellent heat and acid resistance, but it is difficult to completely cure at low temperature, and the paint film is very brittle
The polyamide curing agent also has the problem of being difficult to cure at low temperature, and because the polarity difference between the curing agent and the resin is relatively large, it is prone to phase separation and migration, resulting in stickiness of the paint film, which seriously affects the anti-corrosion performance of the paint and the layer of the paint film. adhesion
The performance of phenalkamine curing agent is better at low temperature, but the general phenalkamine curing agent has the disadvantage of brittle paint film

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The preparation method of the composite epoxy curing agent for heavy anticorrosion paint, it comprises the following steps:

[0030] (1) Add 80 parts by weight of aniline to the reaction bottle, start stirring, heat to 80° C., and then add 2 parts by weight of 36% hydrochloric acid by volume. 18 parts by weight of paraformaldehyde were added in 5 batches with an interval of half an hour each time, and the temperature in the bottle was maintained at 120°C. After the feeding of paraformaldehyde was completed, it was kept at 120°C for 5 hours, and finally vacuum dehydrated to prepare modified aromatic amine 1 for later use.

[0031] (2) Add 40 parts by weight of phenol into the reaction bottle, then add 45 parts by weight of diethylenetriamine, start stirring and mix evenly, and the temperature rises to 80°C. 15 parts by weight of paraformaldehyde were added in 5 batches with an interval of half an hour each time, and the temperature inside the bottle was maintained at 80...

Embodiment 2

[0035] The preparation method of the composite epoxy curing agent for heavy anticorrosion paint, it comprises the following steps:

[0036] (1) Add 80 parts by weight of N,N-dimethylaniline to the reaction bottle, start stirring, heat to 90° C., and then add 2 parts by weight of 36% hydrochloric acid by volume. 20 parts by weight of paraformaldehyde were added in 5 batches with an interval of half an hour each time, and the temperature in the bottle was maintained at 120°C. After the feeding of paraformaldehyde was completed, it was kept at 125° C. for 4 hours, and finally vacuum dehydrated to prepare modified aromatic amine 1 for later use.

[0037] (2) Add 40 parts by weight of cardanol to the reaction bottle, then add 45 parts by weight of ethylenediamine, start stirring and mix evenly, and the temperature rises to 80°C. 15 parts by weight of paraformaldehyde were added in 5 batches with an interval of half an hour each time, and the temperature inside the bottle was maint...

Embodiment 3

[0041] The preparation method of the composite epoxy curing agent for heavy anticorrosion paint, it comprises the following steps:

[0042] (1) Add 80 parts by weight of m-phenylenediamine into the reaction flask, start stirring, heat to 75° C., and then add 3 parts by weight of 36% hydrochloric acid by volume. 18 parts by weight of paraformaldehyde were added in 3 batches with an interval of half an hour each time, and the temperature in the bottle was maintained at 120°C. After the feeding of paraformaldehyde was completed, it was kept at 115° C. for 4 hours, and finally vacuum dehydrated to prepare modified aromatic amine 1 for later use.

[0043] (2) Add 40 parts by weight of nonylphenol into the reaction bottle, then add 40 parts by weight of ethylcyclohexanediamine, start stirring and mix evenly, and the temperature rises to 70°C. 20 parts by weight of paraformaldehyde were added in 5 batches with an interval of half an hour each time, and the temperature inside the bot...

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Abstract

The invention discloses a compound type epoxy curing agent applied to heavy anti-corrosion coating. The compound type epoxy curing agent is prepared from modified aromatic amine and modified phenolic amine, and the weight ratio of the modified aromatic amine to the modified phenolic amine is 1 to (1 to 3). According to the compound type epoxy curing agent disclosed by the invention, the modified aromatic amine and the modified phenolic amine are prepared through preferred schemes, and then the compound type curing agent with excellent comprehensive performance can be compounded and obtained through preferred proportion. Experiment results show that the modified aromatic amine and the modified phenolic amine can be mixed and dissolved with each other, can be matched with each other and have stable character. The compound type epoxy curing agent disclosed by the invention overcomes the performance defect of single curing agent and can meet an application requirement of the epoxy heavy anti-corrosion coating. The compound type epoxy curing agent disclosed by the invention can be applied to curing varieties of types of epoxy resin to prepare and obtain coating films, has low viscosity, excellent hardness, impact resistance, adhesion and softness, further has quick surface drying time and further has good chemical corrosion resistance. Compared with the single curing agent and epoxy resin film formation, the compound type epoxy curing agent has more excellent performance and achieves a very good technological effect.

Description

technical field [0001] The invention relates to an epoxy resin curing agent, in particular to an environment-friendly composite epoxy curing agent for heavy anticorrosion coatings and a preparation method thereof, belonging to the technical field of polymer materials. Background technique [0002] Epoxy heavy-duty anti-corrosion coatings generally use modified amine curing agents to obtain paint films with excellent adhesion, water resistance and chemical resistance. [0003] Amines that can be used for modification include aliphatic amines, alicyclic amines, and aromatic amines. Common modification methods include polyamide modification, phenalkamine modification, and epoxy addition method. [0004] Due to the limitation of the structural characteristics of the curing agent, the use of a single curing agent cannot meet all performance requirements. For example, the modified aromatic amine curing agent has excellent heat and acid resistance, but it is difficult to completel...

Claims

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Application Information

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IPC IPC(8): C08G59/62C08G59/56C09D5/08C09D163/00
CPCC08G59/56C08G59/623C09D5/08C09D163/00
Inventor 王涛惠正权王元军
Owner 江苏三木化工股份有限公司
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