Silica itself has excellent properties such as light weight, good chemical stability, and good electrical insulation, but because silica is an ultra-fine and active silica particle, there are a large number of hydroxyl groups on the surface, which is hydrophilic and oleophobic and easy to absorb water and agglomerate, so it is often necessary to modify its surface hydrophobicity to improve its compatibility and binding force with organic phases, improve processing performance, and expand its application fields.
For example, silica is an important additive for ultrafine ammonium phosphate dry powder fire extinguishing agents. Because the ultrafine ammonium phosphate dry powder fire extinguishing agent has the characteristics of small particle size, large specific surface area, high surface activity, fast fire extinguishing speed, low dosage, and fire extinguishing efficiency can be several times that of ordinary ammonium phosphate dry powder fire extinguishing agent, it has been increasingly valued and developed in the industry. However, due to the fact that ammonium phosphate is easy to absorb moisture and agglomerate in ultra-fine conditions, it has higher requirements for dry powder formulation and surface hydrophobic treatment, especially the hydrophobic barrier additive silica in the formula, which not only has a small particle size, but also has good hydrophobic properties.
Silica itself has excellent properties such as light weight, good chemical stability, and good electrical insulation, but because silica is an ultra-fine and active silica particle, there are a large number of hydroxyl groups on the surface, which is hydrophilic and oleophobic and easy to absorb water and agglomerate, so it is often necessary to modify its surface hydrophobicity to improve its compatibility and binding force with organic phases, improve processing performance, and expand its application fields.
For example, silica is an important additive for ultrafine ammonium phosphate dry powder fire extinguishing agents. Because the ultrafine ammonium phosphate dry powder fire extinguishing agent has the characteristics of small particle size, large specific surface area, high surface activity, fast fire extinguishing speed, low dosage, and fire extinguishing efficiency can be several times that of ordinary ammonium phosphate dry powder fire extinguishing agent, it has been increasingly valued and developed in the industry.
However, due to the fact that ammonium phosphate is easy to absorb moisture and agglomerate in ultra-fine conditions, it has higher requirements for dry powder formulation and surface hydrophobic treatment, especially the hydrophobic barrier additive silica in the formula, which not only has a small particle size, but also has good hydrophobic properties.
To obtain hydrophobic silica, it can be prepared by chemical reaction of hydrophilic silica with an active silane such as chlorosilane or hexamethyldisilamine. At present, in order to solve some special technical problems in the industry, various types of hydrophobic silica have been developed - hydrophobic fumed silica is produced by treating modified hydrophilic grade fumed silica with silane or siloxane, and in the final product, the chemical treatment agent is chemically bonded to the original hydrophilic oxide.
In addition to the above-mentioned advantages of hydrophilic products, hydrophobic fumed silica products are characterized by low moisture absorption, good dispersion and rheological regulation even for polar systems. Some products, which are structurally modified on the basis of hydrophobic treatment, can provide further assistance to customers in the development of new products and improve the performance of products – for example, in liquid systems, hydrophobic fumed silica can achieve high addition levels with little effect on the viscosity of the system.
About injection liquid silicone rubber,please check the details: H
igh Strengh Liquid Silicone Rubber IOTA 28-Series
About fluorosilicone rubber,please check the details: Fluoro Silicone Gum (IOTA 110-F series)
About ethyl silicone oil,please check the details:
Polyethylsiloxane Fluids IOTA 2056 PES
About leather silicone rubber,please check :
IOTA Liquid silicone rubber for silicone leather
