In The Field Of Organic Silicon, downstream physical silicon rubber materials can be divided into solid and liquid materials, and both materials are currently widely used in various major industries.
There are many similarities between their application fields and material properties, and their production processes are different. In the field of products, their roles and functions are basically the same.
What are the differences between materials and products?
The main difference between liquid silica gel and solid silica gel is:
one is liquid and the other is solid, liquid silica gel is liquid and has fluidity,solid silica gel is solid and has no fluidity;but after processing the finished product, the two are not so easy to distinguish.
Different fields of use
(1) Liquid silicone is generally used in baby products, silicone kitchen products and medical products, it can directly contact food and human body;
(2) Solid silica gel is generally used for daily necessities, industrial miscellaneous parts and auto parts;
(3) Safety of liquid silica gel and solid silica gel: Liquid silica gel is a highly transparent, high-safety food-grade material. No auxiliary materials such as vulcanizing agent are added during the molding process. The sealing material is formed by sealing.
Solid silica gel is a translucent material. Vulcanization is needed to accelerate the curing time.
Liquid Silicone (LSR): The full name is injection molding liquid silicone rubber, and the vulcanization equipment is an injection molding machine. The injection molding machine process is very simple, the product precision is high, and the output is high (the A/B glue is mixed for a few seconds at a certain temperature). The materials are mixed and added with color glue and catalyst to automatically inject into the mold cavity without manual operation. Product advantages The product has good fluidity, strong stretch and resilience, and the mold is combined injection molding, so the product has a plastic injection port and basically no surface parting lines.
Solid Silicone: The raw material for solid silica gel molding is a solid. After the silicone rubber product manufacturer is mixed by a mixer, it needs to add color glue and catalyst, and then cut it into an appropriate size and manually put it into the mold cavity to form and cure. The automatic processing method requires manual operation to take the mold and discharge the material. Because the material is solid, the fluidity and stretch resilience are slightly lower than that of the liquid. The product has no injection port, and the processed finished product will have upper and lower parting lines .
The differences and application of solid silicone and liquid silicone materials:
Solid silica gel is industrially made of water glass (sodium silicate) as a raw material, hydrolyzed in an acid medium to form a gel, and then made into silica gel through aging, washing, drying, etc., depending on the water content, translucent or white solid. The products on the market have irregular granular, spherical, and microspherical silica gels, which are usually used as catalysts for vulcanization in fluidized bed operations.When used as a catalyst carrier, the silica gel is usually immersed in a solution containing catalytically active components, so that the solution is absorbed into the pores of the silica gel, and the active components are distributed on the surface of the silica. Gelation through drying, activation, etc. 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. Generally, silica gel with an average pore diameter of less than 15 to 20 is called fine pore silica gel; and an average pore diameter of more than 40 to 50 angstroms is called coarse pore silica gel.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 formed in the pores are not easy to escape from the pores, which is possible. Causes a profound side reaction. The pore structure of silica gel is related to the manufacturing method and conditions, such as gelation, aging, pH during washing, temperature, and time. Commercially available silicone daily necessities can be reamed through reaming. The usual method is to heat in an autoclave or add a salt-containing aqueous solution (such as sodium carbonate or sodium acetate).