Study on the rheological properties of silane-modified brucite powder in EVA flame-retardant composites

Driven by environmental regulations, the development of new environmentally friendly flame retardants has become an important topic in materials science. As a highly efficient inorganic flame retardant, brucite powder has been widely studied for its excellent flame retardant properties and environmental friendliness. However, its poor dispersibility in polymers limits its application effect. Silane treatment, as a surface modification method, can effectively improve the dispersibility and compatibility of brucite powder in EVA (ethylene-vinyl acetate copolymer), thereby improving the rheological properties and flame retardant effect of the composite material.

Experimental materials and methods

Experimental materials

EVA resin: as a matrix material, it provides the basic properties of the composite material.

Brucite powder: as a flame retardant, it improves the flame retardant properties of the material.

Silane coupling agent: used to improve the compatibility of brucite powder with the EVA matrix.

Other additives: such as plasticizers, lubricants, etc., are used to adjust the properties of the composite material.

Experimental methods

Silane treatment: Mix brucite powder with silane coupling agent and treat it under specific conditions to enhance its surface activity.

Blending: The silane-treated brucite powder was mixed with EVA resin and other additives to prepare the composite material by melt blending.

Rheological properties test: The dynamic rheological properties of the composite material were tested by rheometer to evaluate the parameters such as shear viscosity, storage modulus and loss modulus.

Results and discussion

Rheological properties: The study found that silane treatment significantly improved the dispersibility of brucite powder in EVA and reduced the growth rate of shear viscosity, indicating that silane treatment improved the compatibility of filler and matrix.

Mechanical properties: Silane-treated brucite powder effectively enhanced the mechanical properties of EVA, especially in tensile strength and elongation at break.

Flame retardant properties: The composite material treated with silane performed better in LOI and UL-94 tests, showing better flame retardant effect.

The application of silane-treated brucite powder in EVA not only improved the rheological properties of the composite material, but also enhanced the mechanical properties and flame retardant properties. This study provides a new technical direction for the development of environmentally friendly flame-retardant EVA composite materials. Future research will focus on optimizing the silane treatment process and exploring the application of different silane coupling agents to achieve more excellent comprehensive performance.

Application Prospects

The application of silane-modified brucite powder in EVA has opened up a new path for the development of high-performance, environmentally friendly flame-retardant composite materials, and is expected to be widely used in electronics, automobiles, construction and other fields.