Solid silica gel VS liquid silicone distinction between two kinds of raw materials, what's the difference in processing way.
Whether solid silica gel or liquid silicone, can be used to silicone mobile phone cover, silicone purse, silicone silicone gifts U disk shell, etc.
A, solid silica gel: industrial sodium silicate (
As a raw material, hydrolysis produce gel in the acid medium, and then by aging, washing, drying and other processes made from silica gel, according to water content is different, for the translucent or white solid.
Goods sold are irregular granular, globular, micro spherical silica gel, which has good wear resistance, used as the catalyst carrier in fluidized bed operation.
When silica gel was used as catalyst carrier, usually will be silicone impregnated in solution containing catalytic active component, make the solution absorption in silica gel inside the pore, after drying, activation and other formalities, the active component in the silicone products
Made of silica gel pore structure on the nature of the load type catalyst has important influence, such as pore volume, pore size distribution of silica gel, etc.
Traditionally, the average pore diameter is less than 15 ~ 20 of silica gel, said fine silica;
The average pore diameter greater than 40 ~ 50, called coarse silica gel.
Fine pore structure of the silica gel with high specific surface area, which is beneficial to catalytic dispersion of active components.
But fine pore structure is not conducive to the spread of the reactant molecules, reach hidden deep in the depths of the pore of the catalytic active component, thus will reduce the catalyst utilization rate of the inner surface, and deep in the pores generated by the product molecules escape hole, not easily also easy to cause deep side effects.
Silica gel on the pore structure and manufacturing method and condition, such as gelling, aging, washing of pH, temperature, time, etc.
By reaming process will be commercially available silicone reaming, common method is to place it in the hot kettle of water or add salt aqueous solution (
Such as sodium carbonate, sodium acetate)
Thermal processing, for example: at 320 ℃, 10 mpa hot-pressing process can make the surface and average pore diameter than 135 m respectively & sup2;
The silicon into 26 / g and 123.
/ g, and 508.
Professional silicone products manufacturer's recommended)
Second, liquid silicone: in addition to the solid silica gel, liquid silicon sol is important carrier of the material, industry usually by ion exchange method makes the silica sol sodium silicate sodium off system.
It is translucent milky liquid, the content of silica in the sold goods is commonly 20% ~ 30%, and the most high is 50%, the colloidal particles diameter of 100 ~ 200, some items of 1300.
A high concentration of silica sol is usually with the aid of trace amounts of sodium oxide to maintain its stability.
Colloidal silica drying after into porous solids.
For example, in production by propylene oxidation of ammoniation to acrylonitrile (
/ silicon oxide catalyst, is to contain active component solution mixed with silica sol, the spray drying method into micro spherical catalyst.
Third, silicone products rubber, organic silicon rubber by linear polysiloxane with reinforcing filler, under the condition of the heating pressure sulfide generated special synthetic elastomer.
It perfectly balanced mechanical properties and chemical properties, and thus can satisfy the requirement of many demanding applications today.
High performance silicone rubber in the following areas: 1)
, high and low temperature stability, 2)
, the inert (
, transparent, easy to color, 4)
, wide range of hardness, 10 ~ 80 Shao Er hardness 5)
, resistant to chemicals used in 6)
, weather resistance, 7)
, sealed performance is 8)
And electrical properties of 9)
, resistant to compression deformation in addition to the outstanding performance, compared with conventional organic elastomer, silicone rubber are particularly easy to manufacture.
rubber easy flow, thus it can be in mold under the condition of low energy consumption, calendering, extrusion.
Easy processing means high production efficiency.
Common processing ways we use high temperature liquid silicone injection molding production products, with compression molding equipment production of solid silicon and silicon rubber products.
The two are quite different in the production efficiency.
The baby of the pacifier use liquid silicone material, for example, with injection molding equipment production efficiency is higher.
There are some miscellaneous pieces of silicone small also usually use injection molding, production and time are the dominant.
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