Crosslinking agent for epoxy coatings

Crosslinking agent for epoxy coatings

The crosslinking agent of epoxy resin coatings can be divided into the reaction with the epoxy groups of epoxy resin of crosslinking agent and reaction with hydroxyl of the epoxy resin crosslinking agent and crosslinking agent react with epoxy group.

The requirement of the solvent used for coating:

(1) there is good solubility and volatility, the solvent is mixed with the main membrane substance, and the volatile velocity should meet the construction requirement.

(2) there is no chemical change in the composition of the paint.

(3) low toxicity, low price, abundant raw materials.

Classification of solvent variety

There are many types of solvents, which can be divided into the following categories according to their chemical composition and origin:
(1) terpene solvents: most of it comes from pine secretions. It is commonly used for turpentine, pine oil, etc. The ability of turpentine to dissolve natural resin and resin is greater than the common banana water, less than benzene. It has a moderate volatility, which conforms to the requirement of paint painting and drying.




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


(2) petroleum solvents; Such solvents are hydrocarbons. It's fractionated from oil. It is commonly used in gasoline, rosin water, fire oil and so on. The gas is volatilizing fast, the danger is large, and in general it is not used as a solvent. Rosin water is a commonly used solvent in paint, and its characteristics are less toxic, usually in oily paint and magnetic paint.

(3) coal tar solvents: such solvents are also hydrocarbons. It's the distillation of coal. Commonly used, benzene, toluene, xylene, etc. Ability is very strong, the dissolution of benzene is a natural drying oil, resin of strong solvent, dissolving shellac, but is toxic, volatile fast, generally do not often use in paint, general detergent; The dissolution ability of toluene and benzene are similar, mainly as solvent alkyd paint, can also be thinner, with epoxy resin, paint and so on, a small amount of used in detergent; The solubility of xylene is slightly lower than toluene, which is less volatile than toluene and is less toxic than benzene, which can be substituted for rosin water as a powerful solvent.

(4) lipid solvents: the combination of low carbon organic acids and alcohols, commonly used in the use of butyl acetate, ethyl acetate, ethyl acetate, amyl acetate, etc. The tintin is small, usually used in spray paint, for easy construction, and also prevents resin and nitric acid fibers from separating out. Ethyl acetate is better than butyl, which is often used in wood and other nitrocellulose lacquer; It is less volatile and can be used in fiber paint to improve dry and white.

(5) ketone solvents: it is an organic solvent which is used mainly to dissolve nitric acid fibers. It is commonly used for propion, methadone, methamphetamine, cyclohexanone, ketone, etc. The acetone solution is very strong, the volatilization speed can dissolve in any proportion of water, so it is easy to absorb water and make the paint film dry and white, and the crust. It is commonly used with volatile solvent. Most of it is used in spray paint and quick-drying adhesive. But acetone is very easy to burn and should be noted for fire prevention. Ketone is less volatile than acetone, and the dissolvent tip is poor and can be used separately. The ability of methamphetaminolysis to be high and volatile, to prevent the coating from being white; The cyclohexanone is slow and soluble, allowing the film to form a smooth and smooth surface in drying, preventing bubbles from producing.

(6) alcoholic solvents: it is an organic solvent that can be mixed with water, commonly used in ethanol, butanol, etc.

The solvent of alcohol-type solvents is poor to the coating, and can only dissolve the shellac or acetal resin. When used with lipid and ketone solvents, they can increase their solubility, thus calling them the solvent of nitrocellulose. Ethanol does not dissolve the general resin, but can dissolve ethyl fiber, shellac etc. It can also be used to make alcohol varnish, wood stain, wash primer and so on. Butanol is slightly less soluble than ethanol, which is less volatile and is similar to ethanol. Common with ethanol, can prevent paint film white, eliminate needle hole, orange peel, bubble etc. The special effect of butanol is to prevent the gel from the paint, reduce viscosity and also be the solvent of amino resin.

7) other solvents: chlorinated solvents, nitroalkane solvents, ether alcohol solvents are commonly used. Chlorine-containing solvents are very strong, but they are very toxic and are used only in certain special summation depaint agents; The solvent of nitroalkane is about the same as that of butyl acetate, while the solvent is very high in nitrocellulose. An etheric solvent is an emerging solvent with ethyl ether ethylene glycol, methyl ether glycol and lipid. It is commonly used in nit-cotton paint, phenolic resin paint and epoxy resin paint.

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Diethyl toluene diamine(DETDA)  http://www.yaruichem.com