Understand the application performance and production process of dispersant in three minutes

Dispersant, can make the solid flocculation group dispersed into fine particles and suspended in the liquid material, general solid powder in the liquid, is a particle collision formed with a lot of gap polymerization, the polymerization can be distinguished according to the binding force between particles. If the use of very weak mechanical force and solid and solvent interface of the physical force can be split into a single particle, but the elimination of the external force and restore to the original particle collection state, this aggregate is called flocculation requires a strong mechanical force after splitting difficult to restore to the original state of aggregation called aggregation. The process of splitting secondary particles into primary particles and keeping them is called dispersion.

All can promote to a particle split, and has the effect of preventing flocculation of the material called dispersant.

Generally, the dispersion process can be divided into two processes: flocculation-individual particles and the stabilization of individual particles. The first process is grinding for inorganic pigments, and the function of dispersants is mainly the second process, that is, to prevent reflocculation of the dispersed particles.

Dispersants are mainly divided into three categories: surfactants, inorganic dispersants and polymer dispersants, which are mainly used in dye, paint, paper making, cosmetics, pesticides, petroleum and other industries.

(1) surfactant dispersant

① The main anion dispersants are alkyl sulfate salt, sodium alkyl benzene sulfonate, sodium petroleum sulfonate, and so on. Many anionic dispersants are emulsifiers.

② Cationic dispersant is widely used as mineral flotation collector, less used as dispersant in aqueous solution, commonly used as dispersant in oil and brush coating.

③ Non-ionic dispersants are mainly used for the dispersion of organic matter. Some species have stronger dispersion ability than anionic dispersants, including fatty alcohol polyoxyethylene ether, sorbitol anhydride fatty acid polyoxyethylene ether and so on.

(2) the common inorganic dispersant is silicate, condensed phosphate and other electrolytes, mainly used for the dispersion of inorganic pigments.

(3) Polymer dispersant starch, gelatin, lecithin and other natural products and carboxymethyl cellulose, hydroxyethyl cellulose, sodium alginate, lignosulfonate and other derivatives of natural products are polymer dispersants.

Polyvinyl alcohol, β naphthalenesulfonic acid formaldehyde condensation, alkyl phenol formaldehyde condensation and so on are good dispersing agents for polymer synthesis.

Dispersant S

Appearance: Brown powder

Solubility: soluble in water

Application performance

This PRODUCT IS USED AS DYE SANDING AND blending aid, which can shorten the grinding time, improve the dispersion and coloring power of the dye, less foam and thus good dyeing power and color. Can be used with other anionic and non-ionic surfactants

Production methods

P-hydroxybenzyl sulfonic acid was prepared from cresol and naphthol was prepared from naphthol. P-hydroxybenzyl sulfonic acid and naphthol sulfonic acid were added to the condensation kettle and condensed at 196kPa, respectively. After the reaction, add alkali to adjust the pH value to 8.0 ~ 10, cool and crystallize, filter, and get the finished product

Dispersant BZS

Appearance: Red powder

Solubility: soluble in water

Application performance

This product is used as dye dispersing agent, levelling agent and detergent. Can also be used to prepare wool, viscose fiber softener, knitting lubricant and resin finishing softener

Production methods

The amount of o-phenylenediamine and stearyl chloride were successively added to the condensation kettle, and the acylation reaction was carried out by stirring at 0 ~ 5℃, and the reaction was carried out between pH 8 and 9. After the reaction, toluene with water agent was added, heated up, and the azeotrope of effluent and toluene was continuously steamed under reflux. After SEVERAL HOURS OF REACTION, the residual amount of O-phenylenediamine was checked, and the product was pressed into a second condensation kettle and the alkylation reaction was carried out by dropping benzyl chloride. Finally, adding fuming sulfuric acid for sulfonation and neutralization reaction, cooling, crystallization, drying, the finished product