Dispersant is a surfactant with two opposite properties, lipophilicity and hydrophilicity, in the molecule. It can evenly disperse the solid and liquid particles of inorganic and organic pigments that are difficult to dissolve in liquids, and at the same time prevent the sedimentation and agglomeration of particles, forming the amphiphilic agent required for a stable suspension.
What is an aqueous dispersant?
Aqueous dispersant is a chemical substance that disperses solid particles in water to form a colloidal solution, and achieves the dispersion of solid particles by reducing surface tension. Aqueous dispersant is a commonly used additive in the coating industry, which helps to disperse paint pigments and fillers, making the coating easier to disperse and uniform. Aqueous dispersants are non-flammable, non-corrosive, and insoluble in organic solvents such as ethanol, acetone, and benzene.
According to the different chemical structures and application fields, aqueous dispersants can be divided into two categories: ionic and non-ionic.
Ionic aqueous dispersants: anionic, cationic, non-ionic ionic dispersants.
Non-ionic aqueous dispersants: non-ionic aqueous dispersants are usually composed of polyvinyl alcohol, polyacrylate, etc.
Four characteristics of water-based dispersants:
Characteristic 1: Good solubility. Water-based dispersants have good solubility and can quickly dissolve in water to form a colloidal solution.
Characteristic 2: Environmentally friendly and non-toxic. Water-based dispersants do not contain harmful substances, are non-toxic and harmless to the environment and human body, and meet environmental protection standards.
Characteristic 3: Wide adaptability. Water-based dispersants are suitable for the dispersion of a variety of solid particles, including dyes, coatings, plastics, etc.
Characteristic 4: Economical and efficient. Water-based dispersants are easy to use, low-cost, and can improve production efficiency and product quality.
Three major disadvantages of water-based dispersants:
Disadvantage 1: Poor stability. Water-based dispersants are easily affected by external factors such as temperature and pH value, and have poor stability.
Disadvantage 2: Limited function. Water-based dispersants have poor dispersion effects on some special solid particles and limited functions.
Disadvantage 3: High storage requirements. Water-based dispersants need to be protected from light and sealed during storage, otherwise they are likely to lose their dispersion effect.