Surfactants in water soluble and organic pigment applications
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Wetting agents
Wetting agents such as JFC, JFCS, Pingping Plus, EL series and AEO series, penetrant T, etc. are all surfactants on the market and are wetting agents for textiles. The wetting agents for textiles all have a fatty carbon chain as a hydrophobic group, and have no similarity with the chemical structure of the dye (pigment) aromatic hydrocarbon, and the affinity is low and the bonding is not strong. Therefore, the hydrophobic base of the dye (pigment) wetting agent is aromatic hydrocarbon, which is bonded to the dye (pigment) particles in a strong anchoring manner, so as not to fall off from the surface of the particle during long-term placement, and the hydrophilic group is stretched. Provides a repellency or repulsion in the water.
The degree to which the hydrophobic group is an aromatic hydrocarbon wetting agent is different from that of the dye (pigment) particles, and TX-10 is compared with Solsperse 27000 as an example.
Sulfation of TX-10, S-27000 and emulsifier 600 yields two hydrophilic groups in one molecule.
In addition to sulfation, carboxylic acid esterification also has good compatibility with many commonly used organic pigment carboxylic acid polymer dispersants.
In order to improve the affinity with the hydrophobic part of organic pigments, Xu Yanli and others of Beijing University of Chemical Technology studied the surface modification of phthalocyanine blue by using Tmeen20 carboxylate as an aqueous decomposing agent.
Adding 0.5%~3.0% to the phthalocyanine blue with the above additives, the critical surface tension σC(σSC) increased from 23mN/m to 34.8mN/m, increased by 351%; the contact angle to water decreased from 82.4 to 47. The decrease is 347%. Therefore, the wettability of phthalocyanine blue in water is greatly improved, the fluidity is improved by 2.5 times after treatment, and the dispersion stability in water is increased by 29%.
The above nonionic surfactant is subjected to carboxylation to obtain a corresponding product, which can be used as a dye (pigment) to wet and disperse a surfactant.
Dispersant
Lignosulfonic acid is most effective in the dispersant. Lignosulfonate is a polymeric plough of anionic surfactant consisting of a plurality of hydroxyl groups and sulfonic acid groups of 4-carboxy-3-methoxypropane, the average molecular weight is 8000~13000, and the sulfonate is generally sodium salt and calcium salt. There is also an ammonium salt, which is a polymer electrolyte.
The use of ammonium lignosulfonate is more effective than other sulfonates in increasing dye solubility. The ammonium lignin sulfonate has not been mass produced in China. It is recommended to use Borregperse AM-320 from Borregard; Lignosol TSF from Reed, Lignosol TSD, Lignosol TSF-65 and Lignosol SFX-65.
Production of environmentally-friendly water-based inks with water-based ink additives and water-soluble resins and water-based ink pigments
Water-soluble resin: Domestically, rosin-modified maleic acid resin, urethane resin, styrene-modified maleic acid resin, aqueous amino resin, water-soluble acrylic resin such as polyvinyl alcohol and carboxymethyl cellulose are often used.
A surfactant for aqueous inks.
The water-based ink additives are as follows: 1 defoaming agent, used to eliminate the foam in the aqueous ink, the dosage is generally 1% to 2%. 2 Ink stabilizer, mainly to prevent the ink from coalescence and mold during storage and transportation, can reduce the viscosity of ink and adjust the pH value of ink, generally use ammonia or ethanolamine. 3 Others include dispersants, preservatives, leveling agents, slip agents and cross-linking agents. These additives are used scientifically to improve the weakness of water-based inks, thereby improving the stability of water-based inks.
Aqueous ink solvent
Preferred basic formula of water-based ink: water-soluble acrylic acid 25%~35%, water 15%~25%, ethanol 5%~15%, triethylamine 5%~10%, pigment 10%~30%, auxiliary 1 %~3%.
Application of environmentally friendly water-based inks: The most important application areas for environmentally-friendly water-based inks are flexographic printing and gravure printing. 95% of flexographic prints use ink and 80% of gravure prints use ink. In 2001, there were 200 narrow flexographic printing production lines in China, and 100,000 tons of water-based inks were needed annually.