Different concentrations of coating crosslinking agent

Different concentrations of coating crosslinking agent, the different diluted concentrations for the stability of the crosslinking agent, film performance and dispersion has great influence.

Experimental process is that the adjustable coating dilute into different concentration of crosslinking agent in 50 ℃ oven 1 week, observe whether the agglomeration and the change of viscosity, to test its stability. Then plate respectively, observe whether its luster and efflorescence, to test its paint film performance and ease of dispersion.

Ethers solvent for water-based resin mixes with water-based isocyanate gel time has great influence. Further study has found that its gloss of coating, surface effect and hardness has greater influence. May be ethers solvent easy hydrolysis in water, acid and alcohol free, can react with NCO, which affects the performance of the paint film.

So should choose when diluted water-based isocyanate has good compatibility with water solvent, and the lower the boiling point, the better, the current commonly used thinner have PMA, DMM, etc., but as a result of PMA prices are relatively cheap and more common, so choose PMA for water-based isocyanate is more of the thinner.

Can be seen that dilute concentration, the smaller the better the performance of dispersion, and stable performance. Diluting the concentration, the greater the dispersion performance is poor, but we can good stability. To sum up, in dilute concentration was 60%, comprehensive performance is better.

The choice of water-based isocyanate crosslinking agent is an important content of aqueous bicomponent wood lacquer coatings. Need to consider the effect of crosslinking agent to burnish, storage stability, the influence of dilute concentration as well as an important service life, etc. Need to list the different water hydroxyl resin at the same time the demand for water crosslinking agent may also be different (increase hardness, anti cracking, etc.), so choose water crosslinking agent experiment, with water-based hydroxyl resin is chosen at the same time.




Chinese name: Diethyl toluene diamine(DETDA)

Diethyltoluenediamine Uses:

The product is identical to Ethancure 100 and Lonza DETDA 80, DETDA is very effective polyurethane elastomer chain extender; also be used as polyurethane and epoxy resin curing agent, epoxy resin of an antioxidant, industrial oils and lubricants . In addition, also as intermediates in organic synthesis.Especially for the RIM (reaction injection molding), is important in the field of spray polyurea chain extender species. Also can be used for casting polyurethane elastomer (CPU) and a curing agent, epoxy curing agent, epoxy resin of antioxidants, lubricants and industrial oils other antioxidants.


Waterborne wood paint are water-based isocyanate is to improve the performance of an important way, is an important factor of two-component waterborne wood paint chemical properties, is the most effective way to improve the comprehensive performance.

Bayhydur 305 dispersion performance is poorer, but can be used after dilution, comprehensive performance is good, suitable for application in matte paint, price cheaper; Bayhydur XP2655 prices more expensive, but has the very good dispersion performance, without dilution also has the very good construction performance, suitable for application in light paint. RHODOCOAT WT 2102, comprehensive performance is better, but should not be used for the highlights in the coating.

Is, polyurethane (PUR polyurethane resin) - indoor or outdoor use, decorative and functional purposes. Polyurethane powder coatings not only has high ornamental and excellent physical and mechanical properties, chemical resistance and has a more comprehensive, especially not easy yellowing, weather resistance and light fastness.

Polyurethane coating is developed into the mainstream of the powder coating, the powder and the proportion of more and more big, because of the polyurethane coating with excellent weatherability, excellent physical and mechanical properties and anticorrosive, coating light plump, abrasion resistance, scratch resistance, solvent resistance, good flowing property, strong adhesion. Currently widely used in home appliances such as refrigerators, washing machines, air conditioning, senior furniture, automobile, motorcycle industry, etc.

Polyurethane coating generally has two big series: 1. The sealing ability of polyurethane powder coating. Polyester - carbamate type powder coating, acrylic urethane powder coating; 2. Uv crosslinking powder coating.

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