Crosslinking agent for water-based polyurethane coating

Crosslinking agent for water-based polyurethane coating

The effect of polyisocyanates on performance. In this experiment, the species and number of polyols were not changed, the type of isocyanate was changed, and the H12MDI was found to be significantly improved. The peel strength is also acceptable.

2.3 n (-nco)/n (-oh) values affect performance. In the reaction of fixed number of polyols, change the number of isocyanate, found that as the system of n (NCO)/n (OH) - increases, the tensile strength of the film increased, flexibility, rigidity, hardness, toughness, folding resistance is reduced, but the heat resistance performance improvement. This is because as the ratio increases, the hard parts of the system and the urea bonds also increase, so the resistance is reduced and the thermal adhesion increases. A combination of factors, n (-nco)/n (-oh), is appropriate for 1.1-1.2.

The effect of small molecule alcohol on performance. Found by experiment, with 1, 4 butyl glycol two cooperate with TMP, temperature resistance and peel strength can be unified, effectively use 1, 4 butanediol heat resistance is poor, TMP alone high peel strength, of which 1, 4 butyl glycol two the number of TMP ratio 2.1-2.5:1 performance meet to the requirement of use.

Effect of inorganic silicon modified resin. Comparative experiments have found that the addition of inorganic silicon modified resin on the final product of low peel strength produced significant help, through the experiment, inorganic silicon modified resin with the formula according to the proportion of 1:9, join the flow rate of 1 kg/min, 15 ℃ keep stirring for 1 hour, optimal performance and storage stability.

Operating characteristics:

(1) single component self-crosslinking products.

(2) the highest oven temperature about 120 ℃, low drying temperature, energy saving effect is good.

(3) the film machine can reach up to 120 meters per minute and production efficiency is high.

Technical indicators:

(1) exterior view: there is blue light translucent liquid, no mechanical impurities.

(2) solid content: 25 plus or minus 2 percent

(3) pH: 6.5-9

(4) viscosity: 15 + / - 3 seconds (with 4 cups of 25 ℃)

(5) the VOCs accord with the latest national standard of tobacco packaging, "YCT / 207-2014", which is certainly a peak of benzene.
Application process:




Chinese name: Diethyl toluene diamine(DETDA)

Physical and chemical properties: light yellow transparent liquid, slightly soluble in water, soluble in alcohols, ethers, ketones and other polar organic solvents, and polyether, polyester polyol compatibility.

Density 1.022

Viscosity (20 ℃) ??mPa·ss290±10

Pour Point ℃-9

Boiling point of310°C

Flash Point°C161.1°C


(1) coating workshop environment best meets the following conditions: around 25 ℃, relative humidity 60% or less.

(2) it is suggested that the application of ceramic roll coating, 250 lines, and the amount of dry materials will be 1.2-1.4 g/m2, depending on the equipment and process. The substrate is a variety of types of PET films.

(3) it is recommended to be on the machine for 12 to 15 seconds (painted -4 cups), or depending on the equipment process.

(4) suggest that drying temperature of 65 ℃, 90 ℃, 110-120 ℃, 90 ℃, the machine speed for 120 m/min.

Matters needing attention

(1) this product cannot be added to the high hardness water, which can be diluted with 80% concentration.

(2) this product is a anionic, if you want to add other substances, can join the nonionic and anionic substances, do not add acid or cationic substances, join any material please do test to confirm.

(3) if stirred, no more than 600 RPM, no more than 30 minutes.

(4) the product can be dyed with anion or non-ionized water dyes.

After the product is coated and dried, it is recommended that the test evaluate the performance indicators (temperature resistance and stripping) after using 24h.

Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd 

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