Surface modification of brucite powder and its flame retardant properties in silicone rubber

As an environmentally friendly flame-retardant material, brucite powder has been widely used in plastics, rubber and other industries because of its non-toxic, non-corrosive and low price advantages. However, due to its strong surface polarity and poor compatibility with organic matrices, its application in composite materials is limited. In order to improve the dispersion of brucite powder and its compatibility with matrix materials, surface modification is necessary.

Surface modification of brucite powder

Surface modification usually uses a silane coupling agent, which is a bifunctional compound. One end can react with the hydroxyl group on the surface of brucite powder, and the other end can react with the organic matrix, thereby improving the compatibility between brucite powder and the matrix. Studies have shown that surface modification of brucite powder using silane coupling agents A174 and FR693 can significantly improve its dispersion in polypropylene, surface hydrophobicity and compatibility with matrix materials.

. The optimal dosages are 1.5% and 1.0% of the mass of brucite powder respectively, and the modification temperature is 80°C. Adding modified brucite powder to polypropylene can improve the Izod notch impact strength and flexural modulus of composite materials, and significantly improve the flame retardant properties of the material.

Flame retardant properties of brucite powder in silicone rubber

In silicone rubber, the addition of modified brucite powder can improve its flame retardant properties. The modified brucite powder is evenly dispersed in silicone rubber. Due to its high reactivity, it can decompose faster when the material is burned, absorb heat, release water, and form a magnesium oxide coating layer on the surface of the material, thereby improving Flame retardant effect

. In addition, the addition of modified brucite powder can also improve the mechanical properties of silicone rubber, such as increasing the tensile strength and oxygen index, making the material reach a higher flame retardant level.

Surface modification of brucite powder by silane coupling agent can effectively improve its dispersion and compatibility in silicone rubber, thereby improving the flame retardant properties of composite materials. This modification method not only improves the flame retardant properties of the material, but also improves the mechanical properties of the material, providing new possibilities for the application of brucite powder in polymer materials such as silicone rubber. As the demand for environmentally friendly flame retardant materials continues to grow, the application prospects of modified brucite powder will be broader.