What is the difference between liquid silica gel and solid silica gel molding process: The first is the solid silica gel:
1. In industry, solid silica gel is made of water glass (sodium silicate) as raw material, hydrolyzed in acidic medium to form gel, and then made into silica gel through aging, washing, drying and other processes. It is translucent according to the water content. or white solid. Commercially available products include irregular granular, spherical, and microspherical silica gels, which are often used as catalyst carriers in fluidized bed operations. 2. When used as a catalyst carrier, the silica gel is usually immersed in a solution containing catalytic active components, so that the solution is absorbed in the pores of the silica gel, and the active components are distributed on the surface of the silica gel after drying, activation and other procedures. The pore structure of silica gel has an important influence on the properties of the prepared supported catalyst, such as the pore volume and pore size distribution of silica gel. Traditionally, silica gel with an average pore size of less than 15-20 Å is called fine-pored silica gel; with an average pore size greater than 40-50 Å, it is called coarse-pored silica gel. 3. However, the pore structure is not conducive to the diffusion of reactant molecules, but it can reduce the utilization rate of the inner surface of the catalyst, and the product molecules generated deep in the pores are not easy to escape from the pores, which is easy to cause deep side reactions. The pore structure of silica gel is related to the manufacturing method and conditions, such as gel formation, aging, pH, temperature, time, etc. during washing. The commercially available silica gel can be expanded by the pore expansion treatment method. The commonly used method is to place it in an autoclave and add water or a salt-containing aqueous solution (such as sodium carbonate, sodium acetate) to heat and press it, for example: at 320 ° C, 10MPa hot-pressing treatment can change the specific surface area and average pore size of silica gel with 135m2/g and 123Å to 26.9m2/g and 508Å, respectively.

Process introduction of liquid silica gel:
Liquid silica gel is commonly used in industry to de-sodium water glass to make silica sol by ion exchange method. It is a translucent milky white liquid with high stability. The silica sol becomes a porous solid after drying. For example, when making a (phosphorus-molybdenum-bismuth-oxygen)/silica catalyst for the production of acrylonitrile by ammoxidation of propylene, the solution containing the active component is mixed with silica sol, and the microsphere catalyst is prepared by spray drying; For food-grade daily necessities, maternal and child products.

Silicone rubber is available in the following forms: 1. Compounds: This ready-to-use material can be colored and catalyzed according to your processing equipment and end use. 2. Base material: This type of silicone polymer also contains reinforcing fillers. The rubber base can be further compounded with pigments and additives to form a compound that meets your color and other manufacturing requirements. 3. Liquid Silicone Rubber (LSR): This two-component liquid rubber system can be pumped into appropriate injection molding equipment and then heat cured into molded rubber parts. 4. Fluorosilicone rubber compound and base material: Fluorosilicone rubber maintains many key properties of silicone, in addition, it also has excellent resistance to chemicals, fuels and oils. The main chain is composed of alternating silicon and oxygen atoms and a synthetic rubber with organic groups on the silicon atoms. The organic group in the molecule can be -CH3, -C2H3 or -C6H5, etc., correspondingly referred to as methyl, vinyl or methylphenyl silicone rubber. Silicone rubber is a kind of special rubber with high and low temperature resistance (-60～250℃), ozone resistance and good electrical insulation properties. Silicone rubber is a special synthetic elastomer formed by mixing linear polysiloxane with reinforcing filler and vulcanizing under heating and pressure conditions. It has the perfect balance of mechanical and chemical properties to meet many of today's demanding applications.

Liquid silica gel has the characteristics of high and low temperature stability, inertness (odorless and odorless), transparency, easy to color, wide hardness range, chemical resistance, weather resistance, strong sealing performance and compression deformation resistance.

The above description is about: What is the difference between the process flow of liquid silica gel and solid silica gel? Liquid silica gel is easier to process than solid silica gel. Due to the easy fluidity of liquid silica gel, it can be Molding, calendering, extrusion, of course, this also reflects the advantages of its high production efficiency.