Introduction to modified coated calcium silicate
Modified coating of inorganic mineral powder materials refers to the process of surface treatment of the constituent particles of the powder using physical, chemical or mechanical methods to purposefully change their surface physical and chemical properties, surface morphology and structure according to application needs. It can enhance the interaction between inorganic mineral powder and base material; improve dispersion and processability; inhibit powder agglomeration and increase filling amount; improve the comprehensive performance of downstream applications, especially tensile strength, impact strength, flexibility and deflection Strength etc.
The surface treatment agent can be composed of a lipophilic group and a hydrophilic group. The lipophilic group can have physical and chemical interactions with the surface of the inorganic powder and is adsorbed on the particle surface. The lipophilic group faces outward, and the surface of the inorganic powder changes from hydrophilic to hydrophilic. It is hydrophobic, thereby improving the affinity between the inorganic powder and the polymer, and improving the compatibility and dispersion in the polymer composite substrate.
The surface of silicate inorganic mineral materials such as calcium silicate is rich in silanol groups, so it is particularly suitable for surface coating treatment and has good bonding force. Modified coated calcium silicate uses single or multiple surface modifiers for coating treatment on different substrates. It is not limited to traditional aluminum/titanate, silane, emulsion and other coupling agents, making calcium silicate products More prominent and balanced characteristics in downstream applications.
● Used in silicone to improve the release stick roller and processing performance;
● Used in polyolefin materials to improve the problem of reduced toughness after reinforcement and ensure the balance of rigidity and toughness;
● Used in the modification of PC polycarbonate to slow down acid and alkali reaction, improve mechanical properties and improve flame retardant properties;
● Calcium silicate reinforced polycarbonate treated with silane coupling agent, its elastic modulus is three times that of unfilled, and its strength increases by about 15%; ●
Used for polyethylene It can increase the flexural modulus, improve wear resistance and heat resistance, such as increasing the ring stiffness of pipes;
● Used in polypropylene, compared with unmodified calcium silicate, under the same conditions of adding the same amount, the tensile strength , bending strength, impact strength, etc. are significantly improved;
● Used in styrene-butadiene rubber to improve tensile strength, tear strength, elongation at break, wear resistance and other properties;
● Used in non-polar styrene-butadiene rubber, the surface The treated calcium silicate surface is lipophilic, which can improve the wetting and dispersion of calcium silicate in rubber;
● Since most treatment agents have a double bond structure, they can participate in vulcanization, enhance cross-linking, and have a greater reinforcing effect. Great improvement