ALCOSPERSE 747 is a hydrophobically modified carboxylic acid copolymer. It is a highly water-resistant dispersant with both hydrophilic and hydrophobic functional groups. It is a patented product of Akzo Nobel. It is specifically designed to be used in high water-resistant latex coating systems and Various pigment paste systems provide excellent water resistance, good flow and excellent viscosity storage stability.
ALCOSPERSE 747’s unique molecular structure endows the product with versatility, improves the cloud point of non-ionic surfactants, super water-resistant stability and compatibility with other surfactants, and has very good emulsification properties.
With the deepening of people’s understanding of the stability of steric hindrance, according to the needs of the development of water-based industrial coatings, wetting and dispersing agents used in water-based coatings and water-based inks have developed in a direction similar to polymer dispersants for solvent-based coatings and inks. . The molecular structure has two main parts, the pigment affinity group and the secondary chain that is compatible in the aqueous solution. Relying on the pigment affinity group to be anchored and adsorbed on the surface of the pigment particles, and then relying on the secondary extended chains that are compatible in the aqueous solution to form a steric hindrance effect. Different from low-soap compounds, they cannot be ionized, have a larger molecular weight, and have better steric hindrance. Nowadays, block copolymerized polyurethane high melting point pe wax compounds and acrylic graft copolymers are available on the market.
2. High molecular polymer wetting and dispersing agent for solvent-based coatings
The high molecular polymer dispersant used in solvent-based coatings and inks has a certain molecular structure and molecular weight different from the traditional wetting and dispersing agents. The high molecular dispersant is a collection of molecules with different molecular structures and different molecular weights. The relative molecular mass is between 5,000 and 30,000, and some may be higher than this. Most are branched and linear long-chain polyurethane compounds and polyacrylate compounds. The anchor group that is compatible with the surface of the pigment is located in the key part of the polymer main chain. The number of anchor groups ranges from one to several hundred, so they can be firmly adsorbed on the surface of the pigment particles.
Because the types of pigments and surface properties are different, the types of anchors are also different. The structure and composition of the resin used in the coating are different, and the nature and polarity are also different. In addition, the solvent used must be a good solvent for the resin, so the nature and polarity of the solvent are also different. To make the extended chain energy saving of the dispersant compatible with these resin solutions and completely freely extend in the dispersion medium, the design of the extended chain segment must also be effectively selected.
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