aochengchem: Silane on the application of coatings and inks

Due to silane special structure and compose, has been successfully used to adhesion promoters, surface treatment agent for decades. Now silane have become the indispensable constituent of coatings and ink system . Whether it is used as an additive or coating primer will endow excellent performance of coatings and printing ink.

Silane is a molecular structure which has a bifunctional group, represented by the formula is expressed as Y (CH2) nSiX3, wherein Y represents an alkyl group, a phenyl group and a vinyl group, an epoxy group, an amino group, a mercapto group and other organic functional groups, often with a coating matrix resin organic functional groups chemically bonded; X represents a chloro group, a methoxy group, an ethoxy group, etc. These groups easily hydrolyzed to silanol groups with the inorganic materials (glass, silica, metal, clay, etc.) the oxide on the surface or hydroxyl groups .The reaction to form a stable silicon-oxygen bond. Accordingly, by a silane coupling agent, can be set up between inorganic material and organic material interface "molecular bridge",the two properties completely different materials together . Silanol functional groups of the organic functional group, and silane reactive groups can determine what role the silane in the coating system.

According to the different combination of materials, the role of the silane be summarized as follows:
Improve coating adhesion.
Improve durability of the coating.
To improve the weather resistance of the coating.
Improve the coating toughness.
Significantly reduce the viscosity of the dispersion of fillers and pigments to improve the dispersibility of the pigment

Then, what the role of silane in the primer? Covalent bond of silicon atoms have the organic matter and inorganic matter unique function ,silica internal born with stable structure, make it become an important part of high performance coating primer. In the primer using silane coupling agent can improve the sticky nature, to maintain its humidity, chemical resistance, UV resistance and enhanced; improved filler dispersion. Alkoxysilane is compatible with many organic resin. In fact, the silane is a strong polar solvent, polymerization of silane again affect the compatibility of the polymer and the final properties. In the organic matter and inorganic matter surfaces (for example, pigments, fillers, and glass, metal surfaces), an inorganic of the alkoxy-functional groups covalently coupled to a large number of the organic group. Organic functional groups of silane just find the matching organic polymer will produce excellent effect.