A brief analysis of the product characteristics and application market of waterborne epoxy anticorrosive coatings

Group A: Mix the resin, zinc phosphate, iron red, fillers, additives and deionized water according to the formula, and disperse them evenly.
After they are fully grinded, they are filtered and packaged into component A.

Group B: Mix 3520-WY-55 resin and deionized water evenly according to the formula, and then perform filtering operation.
The packaging is Group B.

(2) Top coat

Group A: Mix the resin, carbon black, titanium dioxide, fillers, additives and deionized water according to the formula, then disperse, grind and filter, and the packaging is a component of A.
Group B: According to the formula amount, 3520- WY-55 resin and deionized water are mixed uniformly, and then filtered, and finally packaged into group B.
Formula design, prepare 3520WY55 resin deionized water to fully disperse and dilute.
This can make it easy to use, mix more evenly in the two groups of B, make it have good storage stability and no stratification.

2.
4 The ratio of paint

The particularity of the water-based epoxy resin system and the film-forming mechanism have a great influence on the performance of the epoxy-amine hydrogen ratio and the coating amount of the material.
It is usually used in the preparation of epoxy coatings to mix epoxy resin and amine hydrogen, but if the molar ratio is changed within a certain range, the performance of the film can be improved.
Through comprehensive consideration, more than 10% of the research in epoxy resin can improve the salt spray resistance of the coating.
The paint ratio is a mix of primer and top coat: n (A): n (B) = 1:1.
1.

3.
Analyze and think about the results

3.
1 Research on epoxy resin products

There are two types of infrared spectra of the graft copolymer of epoxy resin and acrylic monomer grafting reaction, grafting to epoxy resin and grafting to epoxy resin; if the active point is first in the epoxy resin The polymerization chain of acrylic monomers is called "grafted to" epoxy resin.
If the polymerization of the acrylic monomer is initiated first, it reacts with the acrylic polymer chain formed by the active site, and the epoxy resin -CH or CH- of the chain is called "graft on" epoxy resin.
Global Coatings Network learned that no matter what kind of graft polymerization, the grafting efficiency is less than 100%, the final product is epoxy resin grafted epoxy acrylic polymer, non-grafted and non-grafted acrylic 3-component mixture.
Without the presence of ester bonds, a neutralized aqueous emulsion can be mixed to obtain a stable aqueous emulsion.
In the epoxy ester copolymerization, the epoxy group and the carboxyl group may react or have no reaction.

3.
2 Epoxy resin The molecular weight and amount of epoxy resin have a great influence on the performance of the modified resin

The softening point and low molecular weight epoxy resin has a degree of polymerization of less than 2 when it is lower than 50°C, and it can be dissolved in organic solvents such as ketones, esters, and ether alcohols.
The resin has strong storage stability, and has high non-hardening agent and non-thermal curing properties.
The cured resin has mechanical properties, acid and alkali resistance, low curing shrinkage, and high insulation strength.
Low-molecular-weight epoxy resins are highly active, easy to modify, and have good transparency.
High molecular weight epoxy resin has low activity and is not easy to be modified, but the impact resistance of paint film is better than low molecular weight epoxy resin.
Considering that it is a water-based coating, it is easy to dissolve, has good anti-corrosion performance, and has a wide range of application prospects and fields.

4.
Thinking about its application performance

4.
1 The influence of the optimization of the ratio of epoxy resin and curing agent on the performance of waterborne epoxy anticorrosive coatings

Changing the molar ratio of epoxy resin and curing agent within a certain range can improve the performance of the film.
If the epoxy is slightly excessive, it can improve water resistance, acid and alkali resistance, and salt spray resistance.
This is due to the lipophilic nature of the epoxy and the hydrophilicity of the amine curing agent.
Therefore, reducing the amine curing agent can effectively improve the lipophilicity of the system.
In some application areas, the amine curing agent can be slightly excessive, and the excessive amine curing agent helps to improve the cure rate and crosslink density, which helps to improve the solvent resistance and stain resistance of the film, adhesion, and abrasion resistance.
And drying speed will be improved.

4.
2 The choice of pigments, fillers and additives has a great influence on waterborne epoxy anticorrosive coatings

The performance of waterborne epoxy anticorrosive coatings also depends on the selection of suitable pigments, fillers, additives, solvents, etc.
Choose pigments with low oil absorption and water absorption, and the pH value is within the acceptable range of water solubility.
For example, carbon black uses a neutral pH value of 6-8.
The choice of additives (such as defoamers, dispersants) to consider compatibility And water-based epoxy.
Some waterborne epoxy curing agents are cationic tertiary amine salts.
Non-ionic additives should be selected to avoid the use of anionic products, otherwise it will form a gel.

 Wet adhesion coating and metal surface anti-corrosion play an important role.
The pigment wettability can be selected according to the substrate wetting agent, dosage, and coating adhesion promoter requirements.
Good selection of materials can greatly improve the performance of waterborne epoxy anticorrosive coatings.

5 Conclusion

The water-based epoxy resin, water-based epoxy curing agent and additives are selected scientifically and rationally, and water-based epoxy coatings with different properties can be made.
The many performance advantages of waterborne epoxy coatings confirm that solvent or solvent-free epoxy resin coatings have broader application prospects.
(Source: Global Coatings Network) (For more information, please log in: Global Coatings Network http:// )