Water-based coatings crosslinking agent

Water-based coatings crosslinking agent,Due to the current high viscosity water-based isocyanate crosslinking agent itself and not easy to stir well when mixed with water-based resin, in the paint and construction is not very convenient. In order to facilitate the construction, need to use water-based isocyanate solvent diluted to a certain concentration.

When choosing the dilution solvent, attention should be paid to the following aspects: (1) solvent not contain can react with - NCO group; (2) the solvent has no effect on - the reactivity of NCO group; (3) the solvent effects on stability and construction of main agent.

Select the appropriate dilute solvent Generally choose ether ester solvent, characterized by small odor and toxicity, can dissolve water-based isocyanate, and have higher solubility in water. Selection of a propylene glycol methyl ether acetate (PMA) and some common waterborne wood paint film additives, such as propylene glycol methyl ether, dipropylene glycol butyl ether, etc.

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.

Select the appropriate dilute concentrations. Different diluted concentrations for the stability of the crosslinking agent, film performance and dispersion has great influence.

Experimental process is that the adjustable dilute into different concentrations 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.




Chinese name: Diethyl toluene diamine(DETDA)

Diethyltoluenediamine packing： net weight 200KG/ galvanized iron drum (a small cabinet pallet loaded 16 tons), 1000KG/IB barrels (a small cabinet loaded 18 tons or 23 tons of ISOTANK).


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.

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.

Advantage of the characteristics of paint film is slightly transparent, choose appropriate color can make the color of the paint color more than the original coating is bright, this is according to the principle of natural reflection absorption, color and color overlay to produce a kind of color, coating project called "color". Such as primer can make bright red and yellow make red more red, gray primer is primer can make the black more black, blue water blue paint to make white more clean and white. Cream, pink, ivory color, sky blue, should be white primer.

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