The use of nano-silica is very broad, generally adding weight of 0.5-2%, and individual product systems can reach more than 10%. The key to product performance is: fully dispersed into the system. When used, the nano silica is dispersed in water, acetone, alcohol or other solvent according to different systems. For the oil system, it can be supplemented with an auxiliary agent for pretreatment. Mainly used in the following areas.
(1) Electronic packaging materials
By fully dispersing the surface-treated nano-silica in the silicone-modified epoxy resin encapsulant matrix, the curing time of the encapsulant can be greatly shortened (2.0-2.5 h), and the curing temperature can be lowered to room temperature. , the device sealing performance is significantly improved, increasing the service life of the device.
(2) Resin composite
The nano-silica particles are sufficiently and uniformly dispersed in the resin material to comprehensively improve the properties of the resin-based material. Including: A to increase strength and elongation; B to improve wear resistance and improve the surface finish of the material; C anti-aging properties.
(3) Plastic
The use of nano-silica light transmission and small particle size can make the plastic more compact. After adding silica to the polystyrene plastic film, it can improve its transparency, strength, toughness, water resistance and anti-aging property. The ordinary plastic polypropylene is modified by nano-silica, and its main technical indexes (water absorption rate, insulation resistance, compression residual deformation, flexural strength, etc.) meet or exceed the performance index of engineering plastic nylon 6.
(4) Coating
It can improve the suspension stability of the coating, poor thixotropy, poor weather resistance, poor scrub resistance, etc., and the bonding strength between the coating film and the wall is greatly improved, the hardness of the coating film is increased, and the surface self-cleaning ability is also improved.
(5) Rubber
Silica is known as white carbon black. After adding a small amount of nano-SiO2 to ordinary rubber, the strength, wear resistance and aging resistance of the product meet or exceed the high-grade rubber products, and the color can be kept unchanged for a long time. The nano-modified color EPDM waterproofing membrane has obvious improvement in wear resistance, tensile strength, folding resistance and anti-aging property, and has bright colors and excellent color retention effect.
(6) Yan (dyeing) material
The surface modification treatment of organic pigments (dye) by adding nano-SiO2 not only greatly improves the anti-aging properties of pigments, but also increases the brightness, hue and saturation, and greatly expands. The grade and application range of organic pigments.
(7) Ceramics
The replacement of nano-A1203 with nano-SiO2 can not only play the role of nano-particles, but also the particles of the second phase, which can improve the strength, toughness, hardness and elastic modulus of ceramic materials.
The use of nano-SiO2 to composite the ceramic substrate improves the compactness, toughness and smoothness of the substrate and greatly reduces the sintering temperature.
(8) Sealant, adhesive
The addition of nano-SiO 2 is coated with a layer of organic material on the surface to form a network structure to form a silica structure, which makes it hydrophobic, can inhibit the flow of colloid, accelerate the curing speed, improve the bonding effect, and increase the sealing of the product. Sex and impermeability.
(9) FRP products
The nanoparticles and the organic polymer are grafted and bonded to increase the toughness of the material, improve the tensile strength and impact strength, and greatly improve the heat resistance.