Choice of pigment printing crosslinking agent

Choice of pigment printing crosslinking agent

Low temperature solids can be used in either an EH or FH, and the high temperature is fixed with 6MD, 2D resin, etc. If the adhesive chooses self-crosslinking, the medium light color is not required to add the crosslinking agent, and the dark color can be added.

The paint and reactive dyes should not be used in the use of the interlinking agent EH, because EH is very bad. Common web or adhesives contain acrylamide, which is good (good). The reactive dye color stain is better than 6MD because it can be used as a catalyst for 6MD.

In conclusion, the choice of crosslinking agent should be chosen according to the composition of the printing paste, the processing technology condition, the composition of the adhesives, the other dyes and the net, etc. General use of crosslinking agents (owf) : EH 0.5% ~ 3%, 6MD 1% ~ 7%.

The quality of pigment printing adhesive is the key, appropriate chooses dongfeng general white coating adhesive, its accumulation effect is good, general curing temperature whiteness is white and durable, not easy yellowing, good fastness. Polyester/cotton fabrics direct printing, the feeling is softer, the dosage is less, the fastness is good, the color the liquid is good, not to plug the net, can drive smoothly, do not need to add crosslinking agent.

If we produce dark and anti-discharge, because it is resistant to electrolyte, resistance can be strong, and can be used to enhance the fastness by using different foreign couplets according to the prevention and dyeing characteristics. General cotton is printed directly, colour and lustre is medium brunet, a variety of adhesives spell to use, can improve the feeling of the hand, can reduce cost, the printing effect and feeling are good.

The amount of the adhesive should be determined according to the depth of the coating and the size of the cover. If the dosage is too much, it can cause the feeling of the hand to be hard, the printing of the difficulty, the scratching, the drag of the blade, the net eyelet, the adhesion dryer is serious, the lining cloth loses big, the cost increases.




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


General dark dosage is 30% ~ 50%, medium color usage 20% ~ 30%, light color usage 10% ~ 20%. Of course, the amount of adhesives is determined by the amount of solids and the quality. If the adhesives are low in solids and poor quality, they are higher in dosage. On the other hand, high solids and good quality can be used sparingly.

It is necessary to add the catalyst to reduce baking temperature, improve fastness and shorten time when crosslinked adhesive or adhesives, such as 6MD and 2D resin, are used as crosslinking agents. Common catalysts such as magnesium chloride, ammonium chloride, ammonium sulfate, ammonium phosphate, citric acid, tartaric acid etc.

But some catalysts, such as ammonium sulfate, make the skin yellow or crispy, especially at high temperatures. Rapid catalysts, such as magnesium chloride and citric acid, are unstable to the printing press, and are susceptible to the production of the net, which is suitable for the use of ammonium chloride and ammonium hydroxide (ammonium hydroxide is a stabilizer of color paste, and also prevents the brittle fabric). Using diammonium phosphate 1.2%, treatment 2 min under 150 ℃, wash fastness can reach level 3, paste stability or (add 1% ~ 2% of 2% ammonia, such as paste printing paste stability better).

After the pigment printing, curing temperature is one of the important factors that ensure the printing fastness, should be in commonly 130 ~ 130 ℃ baking 3 ~ 5 min, and it is best to use hot air curing. With steam curing fastness to 0.5 1 level lower than the hot air (scrub), using the crosslinking or with 6 md catalyst with steaming fixation, wash fastness most is unqualified, reason should be high temperature baking, medium in hot air is most ideal. The specific baking temperature and time are different from the catalysts used. Some factories in the polyester/cotton fabric printing, curing setting step method is used, the temperature can be increased to 190 ~ 200 ℃, the curing time is 50 ~ 60 s.

The size of the paint particle is generally about 0.5 to 0.05 / mu m, but it has to do with color. The average blue particle is smaller and the reddish yellow is slightly larger. The coating particle has a regular round and irregular polygon, which is ideal for regular circles. Paint particle size of 80% less than 1 m/mu, the shape of particles have rules round bead shape, the wash fastness, sunlight fastness, rubbing fastness than the particle size of 80% in 3 ~ 4 mu irregular polygon coatings have good color fastness grade 1 m or so, and not easy to plug the nets, drive also relatively smoothly.

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