Dispersant

●Glossiness: If the gloss of the paint is to be high, the particles contained in it should not be larger than 5 microns, and the ink should not even be larger than 1 micron. Polymer dispersants can reduce the large particles formed in the paint and help the paint improve its gloss.

The dispersant has two functions: one is to speed up the depolymerization of "agglomerates" and shorten the dispersion time; the other is to delay the time for particles to reunite again and keep the particles in a dispersed state for a long time.

Coating systems: Different types of coating systems (such as water-based or solvent-based coatings) have specific requirements for the amount and type of dispersant. Pigments: Different colors and types of pigments may require specific dispersants for optimal dispersion. Some pigments have a higher settling rate or tendency to aggregate, while other colors disperse more easily.

The selection of dispersants should be based on the characteristics of the pigments to be dispersed and the performance requirements of the coating. Dispersants have a great influence on the particle size distribution, tinting strength, stability, gloss and defects of pigments. The dispersing ability of dispersants is mainly evaluated from the following aspects: viscosity reduction and viscosity stability, particle size distribution of pigment slurry, Tinting strength, color development, hue, covering rate, flocculation, gloss, surface defects, bubbling effects, compatibility with resins and additives, storage stability, etc.

The influence of molecular structure, molecular weight and distribution of dispersant Dispersants are composed of hydrophobic and hydrophilic groups.

t Categories Fatty acids, aliphatic amides and esters The combined use of stearamide and higher alcohols can improve lubricity and thermal stability. The dosage (mass fraction, the same below) is 0.3%-0.8%. It can also be used as a slip agent for polyolefins; hexenyl bisstearamide can also be used as a slip agent for polyolefins. It is called ethylene bisstearamide, which is a high melting point lubricant. The dosage is 0.5% to 2%; stearic acid monoglyceride and tristearic acid glyceryl; oleic acid acyl dosage is 0.2% to 0.5%; hydrocarbon Paraffin-like solid, melting point is 57~70℃, insoluble in water, soluble in organic solvents, poor dispersion, compatibility and thermal stability in resin, dosage is generally less than 0.5%

Resins, especially grinding resins, play a key role in preparing color pastes. 1) Participate in the dispersion and anchoring of pigments 2) Participate in maintaining the stability of dispersed and isolated pigment particles

Solid particle dispersion process The dispersion process of solid particles in the medium is generally divided into three stages. Wetting of solid particles Wetting is the most basic condition for the dispersion of solid particles. To disperse solid particles evenly in the medium, each solid particle or particle group must first be fully wetted. Dispersion or fragmentation of ion clusters. In this process, the particle clusters must be dispersed or fragmented, which involves the separation of the particle clusters and the internal solid-solid interface. Different types of surfactants play different roles in the dispersion or fragmentation of particle clusters.

Glossiness: If the gloss of the paint is to be high, the particles contained in it should not be larger than 5 microns, and the ink should not even be larger than 1 micron. Polymer dispersants can reduce the large particles formed in the paint and help the paint improve its gloss.

dispersant is generally divided into inorganic dispersant and organic dispersant two categories: