In recent years, the research on composite materials of silica and silicone rubber has made significant progress in the fields of materials science, energy, environmental protection and medical treatment, mainly focusing on three aspects: performance optimization, function expansion and application innovation. The following is a specific progress analysis:

1. Performance optimization: structural regulation and interface strengthening

Dispersion and interface compatibility

Nano-scale dispersion technology: Through surface modification of silane coupling agent, the dispersion of silica in the silica matrix is improved and the agglomeration phenomenon is reduced. For example, after the surface of silica is modified with γ-aminopropyltriethoxysilane (APTES), the tensile strength of the composite material is improved and the elongation at break is significantly improved.

Interface chemical bonding: The introduction of double-bonded silane coupling agents (such as vinyltrimethoxysilane) allows silica and silicone rubber to be bonded through covalent bonds, enhancing the interface interaction, and significantly improving the heat resistance and mechanical properties of the composite material.

Improved thermal conductivity and mechanical properties

High thermal conductivity composite materials: After the high thermal conductivity of silica (thermal conductivity of about 0.2-0.3 W/m·K) is combined with silicone, the thermal conductivity of the composite material is significantly improved by constructing a three-dimensional thermal conductive network, which can meet the heat dissipation needs of electronic equipment.

High-strength composite materials: By adjusting the ratio of silica particle size (such as 50-100 nm) and silicone, the mechanical properties of the composite material such as hardness and tear strength are significantly improved, which is suitable for high-strength seals and shock-absorbing materials.

2. Functional expansion: breakthroughs in multiple fields of application

Electronic materials field

Thermal conductive silicone sheet: Silica/silicone composite materials are used as thermal conductive interface materials for 5G base stations and new energy vehicle battery packs to achieve efficient thermal management. For example, a certain brand of thermal conductive silicone sheet has low thermal resistance and high long-term reliability.

Flexible electronic packaging: By controlling the silica content, the composite material has both flexibility and thermal conductivity, which is suitable for flexible circuit board packaging of wearable devices.

Environmental protection and energy fields

High-efficiency adsorption materials: The porous structure of white carbon black is combined with the hydrophilicity of silicone rubber. The composite material has an increased adsorption capacity for heavy metal ions (such as Pb²⁺, Cd²⁺) and can be used for industrial wastewater treatment.

Solar cell encapsulation: White carbon black/silicone rubber composite materials are used as encapsulation glue for solar cells to improve light transmittance while enhancing weather resistance and extending battery life.

Medical and health fields

Antibacterial dressings: Silver ion-loaded white carbon black/silicone rubber composite materials significantly improve the antibacterial rate of Escherichia coli and Staphylococcus aureus, and are suitable for chronic wound care.

Drug sustained-release carrier: By regulating the pore size of white carbon black, the composite material can achieve controlled release of drugs (such as aspirin) and prolong the efficacy of the drug.

3. Application innovation: process optimization and industrialization

Preparation process innovation

Sol-gel method: By controlling the reaction conditions of silicon source and white carbon black, a high-transparency, low-haze composite material is prepared, which is suitable for optical device encapsulation.

3D printing technology: Develop 3D printing inks suitable for silica/silicone composite materials to achieve customized manufacturing of complex structure devices, such as micro heat exchangers.

Industrialization progress

Large-scale production: Domestic companies have achieved continuous production of silica/silicone composite materials by optimizing reactor design and process parameters, and increased annual production capacity.

Standard formulation: The industry has formulated relevant standards to regulate key indicators such as thermal conductivity and tensile strength of products, and promote the standardized development of the market.