Coatings (paint) by crosslinking agent

Coatings (paint) by crosslinking agent: high reactivity, sensitive to water. Can't water in the paint, can't use alcohol solvent. Substrate on the moisture content is too high. Should let stand for 15 to 20 min after modulation.

Dosage of crosslinking agent with wrong or get blank brains cause performance change is very big. One-time can't make too much, put long gel. The drying speed is highly affected by the temperature. 25 degrees takes about three weeks to completely dry.

Shelf life is short, after opening crosslinking agent to closed well and finished as soon as possible. Completely crosslinking of paint adhesion is not good, need to be carefully polished. As the bottom, not with the physical drying oil paint. In thick blister easily. Ordinary yellowing easily, not yellow variant high price.

Nitrocellulose coatings (nitrocellulose) NC

Poly (amino formic acid ester coatings PU (polyurethane)

Amino alkyd resin coating Amino or AC

Unsaturated polyester resin paint PE or UP

Hardening coating UV ultraviolet light

EP epoxy resin coatings

All kinds of coating properties and operation key points:

NC: single fluid from dry type

Advantages: simple operation, dry quickly, without using a time limit;

Disadvantages: not resistant to solvents, poor physical property, elasticity.

Operational key points:

Spraying viscosity: primer: 20-30 seconds; Paint 12-14 seconds; Paint: 16 and 18 seconds;

Dilution solvent: mixed solvent

Strong solvents: esters, ketones,

Cosolvent: alcohol;

Weak solvents: benzene class.

Generally strong solvent dissolving force and volatile rate are stronger, faster, dissolving power, viscosity is reduced, more easily volatile rate is fast, fast drying, but also easy to bleaching.

White: rain or humidity is high, paint spraying bleaching, usually with slow dry mixed solvent dilution, or add water proof, represented by BCS.




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


Yellow degeneration: dry film approved by a period of time or the ultraviolet light will turn yellow, that resistance to yellowing of series of products such as white, to select the appropriate primer oil and gold.

PU: crosslinking type, two liquid type: the main agent and crosslinking agent

Advantages: good adhesion, high hardness, good toughness;

Weakness: the operating point with a time limit, use easy yellowing, not yellow variant unit price is high, the pungent odor.

Operational key points:

Spraying viscosity: primer 14-16 seconds; Finish 10-11 seconds; Paint 12-14 seconds; Spray viscosity too high or too thick, easy to pinhole, recoat interval time is long, the more difficult the pinhole;

Dilution solvent: mixed solvent, selective need PU dedicated thinner, cannot use NC thinner, replace, because crosslinking agent and water react with alcohols, cause not stem or a heat rash;

Matching: different crosslinking agent, there will be a different match ratio, cannot be changed;

Yellow degeneration: dry film approved by a period of time or the ultraviolet irradiation, all can change, that resistance to yellowing of series of products such as white, to select the appropriate principal agent and crosslinking agent, such as resistance to yellowing crosslinking agent.

Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd 

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