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Features and principle of Surfactant
Release Date：2013-11-21 Source：admin Views：1308
Surface active agents are generally low molecular weight dispersant. Surfactant molecules having modified role, especially between pigment and a resin solution to reduce the surface tension. Structure containing the surfactant is dissolved or two groups of opposite polarity, a surfactant is increased. In aqueous systems, a number of polar groups are hydrophilic groups, are non-polar hydrophobic group or a lipophilic group. In non-aqueous systems, the polar group is oleophobic group, as a non-polar lipophilic group. Surfactants classified according to their chemical structure, in particular polar groups include: anionic, cationic, non-ionic and neutral particles. The effectiveness of the polymer dispersing agent is determined by the following factors: the pigment surface adsorption of polar groups. Anchoring group may be an amino group, a carboxylic acid, sulfonic acid, phosphoric acid and salts thereof. The medium surrounding the non-polar segment of the behavior around the particles. Some portion of the molecule (aliphatic or aliphatic - aromatic fragments) must be highly compatible with the adhesive system. Similar stabilization mechanism dispersant surfactant is an electrostatic stabilizer: the pigment particles around the polar group is formed of a double structure charged. Due to Brownian motion, the pigment particles in a liquid medium often collide together, so it has a strong tendency in its deceleration heavy flocculation process.
According to their chemical structure (such as: low molecular weight) and electrostatic stability theory, the surfactant has the following disadvantages: · water sensitivity: surfactant is generally produced so that the water sensitivity of the final coating, suitable for outdoor applications. · Easy to produce a foam: Many bubbles generate a surface modifier, a defect (such as fish eyes, pits) in the coating. If bubbles appear in the grinding process, it results in lower production capacity. · Interfere with adhesion between coats. Over the years, particular surfactants improved, so to minimize the coating defects, and some of the coating also has some other advantages, such as a defoaming / or corrosion resistance of the base material hard to wet. The most commonly used surfactant for pigment dispersion has the following varieties: fatty acid derivatives, phosphates, sodium polyacrylate / polyacrylic acid, acetylene glycol and soy lecithin.
According to their chemical structure (such as: low molecular weight) and electrostatic stability theory, the surfactant has the following disadvantages: · water sensitivity: surfactant is generally produced so that the water sensitivity of the final coating, suitable for outdoor applications. · Easy to produce a foam: Many bubbles generate a surface modifier, a defect (such as fish eyes, pits) in the coating. If bubbles appear in the grinding process, it results in lower production capacity. · Interfere with adhesion between coats. Over the years, particular surfactants improved, so to minimize the coating defects, and some of the coating also has some other advantages, such as a defoaming / or corrosion resistance of the base material hard to wet. The most commonly used surfactant for pigment dispersion has the following varieties: fatty acid derivatives, phosphates, sodium polyacrylate / polyacrylic acid, acetylene glycol and soy lecithin.