Nano Silicon Dioxide:
Inorganic chemical materials such as nanosilica, also known by the name “nano-silica”, are called silicon dioxide or simply white carbon black. This material is often used because of its ultra-fine size (between 1 and 100nm). It has unique properties such as anti-ageing and strength, chemical resistance, and optical properties that resist ultraviolet rays.
The nano-scale silica, an amorphous white powder that is nontoxic, odourless and non-polluting, can be found in the form of amorphous silica. Microstructure of the microstructure is cylindrical with quasi-particle structures that are net-like or flocculent. Its molecular formula is SiO2, while its structural formula is siO2 and insoluble in water.
Nano Silica Application:
It is possible to use nano-silica in large quantities. The weight range is generally 0.5-22% and each product can have more than 10%. Fully dispersed in the system is key to product performance. Following the instructions of different systems, you can disperse the nanosilica in water or alcohol in advance. You can add additives to the pretreatment for oily systems. These additives are used in the following areas:
(1) Electronic packaging
Dispersing nanosiliconol on the silicon modified epoxy resin encapsulant matrix in a complete manner can reduce the time it takes to cure. The curing temperature can also be reduced to ambient temperature.
(2) Resin composite materials
It is possible to improve the performance and quality of resin-based materials by evenly dispersing nano-silicon dioxide particles. A and B can improve strength, elongation and wear resistance. C provides anti-aging and anti-ageing capabilities.
(3) Vinyl
For light transmission, the use of nanosilicon oxide and very small particles can increase plastic density. The polystyrene-based plastic film can be made more transparent, stronger, tougher, waterproof, and better anti-ageing by adding silica. Modifying the polypropylene plastic with nanosilicon oxide will improve its technical indicators, including water absorption, insulation resistance and residual compression deformation. The performance indicators for engineering plastic nylon 6 are met or exceeded.
Paint
You can make the coating more resilient to poor weather conditions, poor adhesion, low thixotropy or poor scrub resistance. This improves bonding strength between the coating and wall. The coating film’s hardness also increases.
(5)
Silica also known as whitecarbon black. A small amount of nano silicon dioxide has been added to regular rubber. This will increase the strength and wear resistance, as well as the ability to maintain the color for long periods. A nano-modified EPDM colour waterproof membrane with excellent color retention and wear resistance.
(6) Pigment dye
Addition of nanosilicon oxide to surface modification of organic colour dye material improves not only anti-ageing, but also indicators of brightness hue and saturation.
Ceramic
The replacement of nano A1203 by nano SiO2 may play more than the role as nanoparticles, but can also include the nanoparticles of the second phase. These particles can enhance the strength, toughness, and elastic modulus, of ceramic materials.
Use of nanosilicon oxide in composite ceramic substrates increases the hardness, durability, and quality of these substrates and reduces the temperature of sintering.
(8) Sealant, adhesive
Nano silicon oxide can be added to the top of the organic material layer. The silica structure is hydrophobic.
(9) FRP items
It is possible to increase toughness and increase impact resistance, tensile strength, and heat resistance by bonding and grafting nanoparticles or organic polymers.
(10)
A good way to slow down the release of nanosilicon oxide is by using it as a carrier.
(11) Cosmetics
Nano-Si02 can be used in cosmetics as an inorganic ingredient. This makes it easy to combine with other ingredients. For the improvement of sunscreen cosmetics, separate chemical reactions are a solid foundation.
(12). Antibacterial material
To exploit the high specific surface area and multi-mesopore structure of nano-SiOX, which has a strong adsorption capability and strange physical and chemical attributes, silver ions, which are functional ions, have been uniformly placed into mesopores of nano-SiOX. They can then be used to create high-temperature antibacterial nano-antibacterial particles that can be widely utilized in medical and healthcare, electrical building materials, plastic products, functional fibres and other industries.
The nano silicon oxide features a small particle size, a large specific area, biocompatibility and the benefits of surface interaction effect, small size effect and quantum size effect. This material is very widely used.
Nano-silica has many active hydroxyl groups, and is therefore highly hydrophilic. It is easy to form secondary aggregation or agglomerates, which can then affect its dispersion within the material. It is therefore necessary to alter the surface of nanosilica to make it more stable and better dispersed in the polymer matrix.
Many methods exist for the surface modification of Nano Silicon Oxide. These can be divided into two main categories: chemical modification or physical modification.
Physical modification for nano silicon dioxide
Nano silicon dioxide can be physically modified to attract the modification agent to its surface. These effects include adsorption, coating, and changing the surface properties. The goal is to decrease agglomeration as well as increase dispersion stability.
Physical modifiers in nano-silica include surfactants and metal oxides.
A variety of materials can be prepared by physical modification to the surface of the Nano Silicon dioxide. These can suit different application needs. It merely absorbs and coats nanosilica particles using van der Waals force, electric force, etc. This makes the interplay force between inorganic and organic phases weak. You may notice phase separation when other factors such as pressure, temperature or pH change.
2. The chemical modification of nanosilicon dioxide
Chemical modification of nano-silica mainly involves the use of large numbers of hydroxyl units on the nano silicon dioxide’s surface. The modifier is used to decrease the number of these hydroxyl groups. It also changes the hydrophilicity of the particles and expands the applications of nano silicon dioxide.
(1) Method of modification to the coupling agent
One of the most common methods for nano-silica coupling agent modifications is silane. It can be combined with the nano-silica hydroxyl group to form a silicone-oxygen bond.
To modify the nanosilica’s surface, a coupling agents must first be broken down before they can react. Hydrolysate can be subject to self-condensation. This will prevent the hydrolysate from reacting with the silica’s hydroxyl groups. It may reduce coupling efficiency and render the nano-silica surface modification incomplete.
(2) Alcohol ester modification method
To alter the wetability of silica surfaces, alcohol ester is the use of fatty alcohol.
The advantage of alcohol ester over the silane coupling agent is the lower cost, ease-of-use, and controllability of the modified fatty alcohol. Modification effects are affected by lengths of alkyl chains, so they must be done at high temperature and under high pressure.
(3) Polymer graft modification method
A specific technique can be used to graft the polymer onto nano-silica. This will increase the hydrophobicity, and the interface affinity of nanocomposites. Chain entanglement can occur due to the long-chain structure. This makes the modification uniform and more tight. You can choose from a variety of grafting monomers or grafting conditions to give your modification more control and diversity.
Mis-asia, Misasia advanced material Tech Co., Ltd., a professional nano silicon oxide manufacturer, has over 12 years’ experience in chemical product development and research. You can contact us to make an enquiry if you need high-quality Nano silicon dioxide.
