moisturizer
The wetting agents available on the market such as JFC, JFCS, Pingping series, EL series and AEO series, penetrant T, etc. are surfactants and wetting agents for textiles. Wetting agents for textiles are all based on fatty carbon chains as hydrophobic groups. They have no similarity to the chemical structure of dyes (pigments) aromatic hydrocarbons, have low affinity, and are not firmly bonded. Therefore, the hydrophobic group application of the wetting agent for dyes (pigments) is aromatic hydrocarbon, which is combined with the dye (pigment) particles in a strong anchoring way, so that it will not fall off from the particle surface during long-term storage, and the hydrophilic group will stretch. Provide potential repulsion or electrical repulsion in water.
Wetting agents whose hydrophobic groups are aromatic hydrocarbons bind differently with dye (pigment) particles. Take TX-10 and Solsperse 27000 as examples for comparison.
Sulfate esterification of TX-10, S-27000 and emulsifier 600 results in two hydrophilic groups in one molecule.
In addition to sulfate esterification, there are also carboxylic acid esterification, which 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 from Beijing University of Chemical Technology studied the surface modification of phthalocyanine blue with Tmeen20 carboxylate as an aqueous decomposer.
Add 0.5% ~ 3.0% to the phthalocyanine blue with the above additives to increase the critical surface tension σC (σSC) from 23mN / m to 34.8mN / m, an increase of 351%; the contact angle to water is reduced from 82.4 to 47, Reduced by 347%, therefore, the wettability of phthalocyanine blue in water is greatly improved, the fluidity after treatment is increased by 2.5 times, and the dispersion stability in water is increased by 29%.
The above-mentioned nonionic surfactants are carboxylated to obtain corresponding products, which can be used as surfactants for dye (pigment) wetting and dispersion.
Dispersant
Among the dispersants, lignosulfonic acid is the most effective. Lignin sulfonate is an anionic surfactant composed of a plurality of 4-carboxy-3-methoxypropane hydroxyl and sulfonic acid polymer plow, the average molecular weight is 8000 ~ 13000, sulfonate is generally sodium salt, calcium salt There is also ammonium salt, which is a polymer electrolyte.
The use of ammonium lignosulfonate is more effective than other sulfonates in improving the solubility of the dye. The ammonium lignosulfonate has not yet been mass produced in China. Some people suggest using Borregard's BorresperseAM-320; Reed's Lignosol TSF, Lignosol TSD, Lignosol TSF-65 and Lignosol SFX-65.
Use water-based ink additives and water-soluble resins and water-based ink pigments to produce environmentally-friendly water-based ink water-soluble resins: rosin modified maleic acid resin, urethane resin, styrene modified maleic acid resin, Water-based amino resin and water-soluble acrylic modified resin such as polyvinyl alcohol and carboxymethyl cellulose.
Surfactant for water-based ink additives.
There are several types of water-based ink additives: â‘ Defoamer, used to eliminate foam in water-based ink, the dosage is generally 1% ~ 2%. â‘¡Water ink stabilizer, mainly to prevent the water ink from coalescence and mold during storage and transportation. It can reduce the viscosity of the ink and adjust the pH of the ink. Generally, ammonia or ethanolamine is used. â‘¢ Others include dispersants, preservatives, leveling agents, slip agents and cross-linking agents. These additives are used scientifically to improve the weaknesses of water-based inks, thereby improving the stability of water-based inks.
Solvent for water-based ink
The preferred basic formula of water-based ink: water-soluble acrylic 25% to 35%, water 15% to 25%, ethanol 5% to 15%, triethylamine 5% to 10%, pigment 10% to 30%, additives 1 % ~ 3%.
Application of environmentally-friendly water-based inks: The most important application areas of environmentally-friendly water-based inks are flexographic printing and gravure printing. 95% of flexographic printing uses water ink, and 80% of gravure printing uses water ink. In 2001, there were 200 narrow-width flexographic printing production lines in China, and the annual demand for water-based ink was 100,000 tons.
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