News Details
Epoxy resin coating used crosslinking agent
2017-9-1 12:17:26
Epoxy resin coating used crosslinking agent
According to the principle of crosslinking agent cross-linked epoxy resin, and can be divided into the epoxy groups of epoxy resin crosslinking reaction of epoxy resin with epoxy group by crosslinking agent, reaction of epoxy resin with hydroxyl of the epoxy resin by crosslinking agent and reaction of epoxy resin with crosslinking agent three categories.
The last category is mainly resin that can react with epoxy resin, such as the phenolic resin containing hydroxymethyl or alkoxy. Melamine resin and polyisocyanate etc.
In amine crosslinking agent, alicyclic amine and its bonus for shallow, good flow property, high gloss, not white, without induction period, but the glass transition temperature is higher, poor flexibility, mainly used as crosslinking agent of solventless epoxy floor coating, use fashion needs to join thiokol, long chain alkyl glycidyl ether and elastic polyurethane flexibilizer toughening processing.
The selection of solvent in addition to should be in accordance with the principle of solvent coating selection of solvent (such as volatile speed, toxicity, cost), should also pay special attention to the solvent on the solubility of epoxy resin, epoxy resin coating should be adopted by the mixed solvent composed of solvent and thinner. Using mixed solvents can reduce cost, improve coating performance and construction performance, and improve solvent dissolving force.
High molecular weight of epoxy resin should use ketone alcohol and ether solvents, molecular weight of epoxy resin can be used in a mixture of aromatic hydrocarbon and alcohol solvent, low molecular weight epoxy resin can be dissolved Yu Fang hydrocarbon solvents, but in order to improve the solvency, multi-purpose aromatic hydrocarbon and alcohol mixed solvent.
For self-leveling floor coatings, appropriate use of slow volatile alcohol-ether solvents can be used to improve leveling. Do not use ester and ketone solvents when configuring epoxy coatings, as ester and ketone solvents react with amine crosslinking agents to reduce crosslinking effects.
In solvent-free self-leveling epoxy floor coating, need to take the appropriate measures to reduce the viscosity of coating, otherwise difficult to achieve or self-leveling coatings construction effect, using reactive diluent is an effective method.
With ordinary concept composed of solvent, diluent, thinner, while Mars is also very low viscosity liquid, can reduce the viscosity of coating and a dilution effect, but the composition of active diluents containing active epoxy functional groups, can react with amine crosslinking agent, become rather like solvent coating components become volatile.
Therefore, in epoxy wear-resistant floor coating, the active diluent is added in the right amount, which can reduce the viscosity of the paint and not increase the organic volatilization content of the paint.
The molecular structure of reactive diluent can be divided into single epoxy-reactive diluents and diepoxy reactive diluents, such as single epoxybutyl glycidyl ether and C12 ~ C14, alkyd glycidyl ether; The latter such as double epoxide 1, 4-butyl glycol ethers.
Chinese name: Diethyl toluene diamine(DETDA)
Diethyltoluenediamine Raw material ：
TDA industrial, Sichuan production
Ethylene (Et) polymer grade, Shanghai production
TEA industrial imports
According to the principle of crosslinking agent cross-linked epoxy resin, and can be divided into the epoxy groups of epoxy resin crosslinking reaction of epoxy resin with epoxy group by crosslinking agent, reaction of epoxy resin with hydroxyl of the epoxy resin by crosslinking agent and reaction of epoxy resin with crosslinking agent three categories.
The last category is mainly resin that can react with epoxy resin, such as the phenolic resin containing hydroxymethyl or alkoxy. Melamine resin and polyisocyanate etc.
In amine crosslinking agent, alicyclic amine and its bonus for shallow, good flow property, high gloss, not white, without induction period, but the glass transition temperature is higher, poor flexibility, mainly used as crosslinking agent of solventless epoxy floor coating, use fashion needs to join thiokol, long chain alkyl glycidyl ether and elastic polyurethane flexibilizer toughening processing.
The selection of solvent in addition to should be in accordance with the principle of solvent coating selection of solvent (such as volatile speed, toxicity, cost), should also pay special attention to the solvent on the solubility of epoxy resin, epoxy resin coating should be adopted by the mixed solvent composed of solvent and thinner. Using mixed solvents can reduce cost, improve coating performance and construction performance, and improve solvent dissolving force.
High molecular weight of epoxy resin should use ketone alcohol and ether solvents, molecular weight of epoxy resin can be used in a mixture of aromatic hydrocarbon and alcohol solvent, low molecular weight epoxy resin can be dissolved Yu Fang hydrocarbon solvents, but in order to improve the solvency, multi-purpose aromatic hydrocarbon and alcohol mixed solvent.
For self-leveling floor coatings, appropriate use of slow volatile alcohol-ether solvents can be used to improve leveling. Do not use ester and ketone solvents when configuring epoxy coatings, as ester and ketone solvents react with amine crosslinking agents to reduce crosslinking effects.
In solvent-free self-leveling epoxy floor coating, need to take the appropriate measures to reduce the viscosity of coating, otherwise difficult to achieve or self-leveling coatings construction effect, using reactive diluent is an effective method.
With ordinary concept composed of solvent, diluent, thinner, while Mars is also very low viscosity liquid, can reduce the viscosity of coating and a dilution effect, but the composition of active diluents containing active epoxy functional groups, can react with amine crosslinking agent, become rather like solvent coating components become volatile.
Therefore, in epoxy wear-resistant floor coating, the active diluent is added in the right amount, which can reduce the viscosity of the paint and not increase the organic volatilization content of the paint.
The molecular structure of reactive diluent can be divided into single epoxy-reactive diluents and diepoxy reactive diluents, such as single epoxybutyl glycidyl ether and C12 ~ C14, alkyd glycidyl ether; The latter such as double epoxide 1, 4-butyl glycol ethers.
Chinese name: Diethyl toluene diamine(DETDA)
Diethyltoluenediamine Raw material ：
TDA industrial, Sichuan production
Ethylene (Et) polymer grade, Shanghai production
TEA industrial imports
A reagent grade additives
Self-leveling epoxy floor coatings are generally used in the common good C12 ~ C14, alkyd glycidyl ether, acrylate glycidyl ether and so on. This kind of reactive diluent has small surface tension and good fluibility, so it can make the film have a high gloss and produce a better mirror effect. The active diluents commonly used in China are n-butyl glycidyl ether.
In addition, some active diluents can also have a toughening effect on the film. Some active diluents have some influence on the heat resistance and chemical corrosion resistance of epoxy floor coatings. At the same time, the dosage of the same active diluent can have a significant influence on the viscosity of epoxy resin (paint).
In the powder coating, the crosslinking agent size has obvious influence on the crosslinking temperature and surface condition of the powder coatings. The smaller the particle size, the lower the crosslinking temperature, the better the surface flow of the film surface, and improve the decorative performance of the coating on the workpiece.
The microparticle diameter crosslinking agent can obviously improve the mechanical properties of powder coatings, which is more beneficial to the crosslinking of powder coatings. Not only the low temperature crosslinking saves the heating energy, but also improves the protective properties of the coating, such as adhesion, corrosion resistance and weatherability.
The primer is sprayed, the painting is finished, and it is found that the walls have a batch of scratch marks or bee eyes that must be polished to meet the requirements.
The grinding should be used to use 280 eyes or 360 eyes water grinding paper, the polishing should be careful, attention should not wear the film wear.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Self-leveling epoxy floor coatings are generally used in the common good C12 ~ C14, alkyd glycidyl ether, acrylate glycidyl ether and so on. This kind of reactive diluent has small surface tension and good fluibility, so it can make the film have a high gloss and produce a better mirror effect. The active diluents commonly used in China are n-butyl glycidyl ether.
In addition, some active diluents can also have a toughening effect on the film. Some active diluents have some influence on the heat resistance and chemical corrosion resistance of epoxy floor coatings. At the same time, the dosage of the same active diluent can have a significant influence on the viscosity of epoxy resin (paint).
In the powder coating, the crosslinking agent size has obvious influence on the crosslinking temperature and surface condition of the powder coatings. The smaller the particle size, the lower the crosslinking temperature, the better the surface flow of the film surface, and improve the decorative performance of the coating on the workpiece.
The microparticle diameter crosslinking agent can obviously improve the mechanical properties of powder coatings, which is more beneficial to the crosslinking of powder coatings. Not only the low temperature crosslinking saves the heating energy, but also improves the protective properties of the coating, such as adhesion, corrosion resistance and weatherability.
The primer is sprayed, the painting is finished, and it is found that the walls have a batch of scratch marks or bee eyes that must be polished to meet the requirements.
The grinding should be used to use 280 eyes or 360 eyes water grinding paper, the polishing should be careful, attention should not wear the film wear.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
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