Q & A on silica Technology
Q: what are the core technologies of fumed silica? Can you summarize it briefly?
In general, it should include the following aspects: 1. Raw material premixing technology before reaction, 2. Closed combustion furnace technology, 3. Bag filter technology, 4. Continuous deacidification technology, 5. Tail gas absorption and desorption cycle technology.
Q: what are the main high-end application areas?
The main application fields of fumed silica are as follows:
1. HTV high temperature silicone rubber, such as the whole chain of silicone, is basically added with fumed silica (such as silica gel for medical and health fields, such as the production of high-pressure insulator for high-speed rail, such as special silica gel for aerospace, such as the rubber for UV resistance, high temperature and low temperature resistance, such as LED packaging)
2. RTV silicone sealant (such as glass glue, such as photovoltaic glue)
3. Paint, such as ship paint
4. Ink
5. Resin, polyester, etc
6. Gel battery, etc
7. For high-end kitchen rubber products, such as products with a specific surface area of about 90, for high-end kitchen rubber
8. For cosmetics
9. Used in medicine and food additives
10. For defoamer
11. Chemical mechanical polishing fluid for semiconductor
12. Used for high-end cold chain such as fast heat shield
13. For thermal insulation materials, fire-resistant thermal insulation materials
14. Matting agent
Q: what kind of fumed silica do customers need most at present?
At present, what customers need most is the middle and high-end fumed silica, rather than the domestic low-end fumed silica. It needs a large number of gas phase silica with high dispersion, stable quality, optional specific surface range, lower or higher than the surface, and appropriate thickening.
Q: MTCs technology, OCI technology, STC technology, which technology is better? In addition, what technology do Evonik, Cabot and wacker use?
There is no special category for fumed silica technology. There is no MTCs technology or STC technology. MTCs refers to the by-product of organosilicon monomer - methyltrichlorosilane; STC refers to the by-product of polysilicon trichlorosilane field - silicon tetrachloride. No matter which raw material is the main technology, the combustion of raw material silicon tetrachloride or methyltrichlorosilane can be realized. The key is whether the product can be done well and make high added value. At present, there is basically no problem in burning silica with chlorosilane. The difficulty is the high-end silica with stable quality, high-end, good dispersion, controllable viscosity and thickening, stable pH and total chlorine. It should be pointed out that different raw materials have different yield and brand proportion due to different reaction heat release, but they are all controllable.
The biggest disadvantage of domestic technology is the low production capacity of a single set. Most of the production lines have a production capacity of about 1000-1500 tons, known as an annual output of 5000, 6000 ton capacity is five or six production lines, with low single line capacity and high unit consumption; moreover, poor product dispersion, uneven particle size, poor viscosity, pH and total chlorine index, and high metal impurities lead to many problems in the downstream application of the product, and even many high-end fields cannot be applied, and in many cases, methyltrichlorosilane cannot be used as raw material for production.
Foreign technologies, such as Wacker in Germany and Cabot in the United States, can be used according to the situation. Silicon tetrachloride, Party A can be used as raw materials alone or STC, MTCs and TCS can be used as raw materials in a certain proportion. Moreover, the single set of production capacity is high. The production capacity of Evonik, Cabot and wacker single line is as high as 10000 tons per year.
The performance of foreign advanced technology is as follows:
(1) A single set of production capacity is high, which can be 5000 tons or even 10000 tons, reducing unit consumption and cost
(2) The raw materials are rich, which can be STC, MTCs, TCS and STC, TCS or a mixture of the three. In the case of less and less silicon tetrachloride, the raw materials are rich and diverse. At the same time, different original can bring about the change and improvement of product quality.
(3) Product packaging is diverse, except for 10kg paper bags, you can adjust the stacking density to make tons of packages, containers, tank cars or according to customer demand.
(4) Products are more abundant, which can be 50, 70, 90.110.130, V15 (150), v15a (150)
,N20(200),N20ST(200),300,380.
(5) Better product dispersion
(6) The product viscosity and thickening are controllable and can be controlled in process
(7) Stable pH, low and controllable total chlorine
(8) Advanced technologies such as dechlorination can improve the yellowness of products and reduce the consumption of chlorine in wastewater
(9) The metal impurities of the products are greatly reduced, and the application fields are expanded (the application of the products can be expanded from the previous RTV and HTV to coating, special resin, FRP, aerospace military industry, high-speed iron insulator, LSR, CMP, high-end kitchen glue, gel battery, vacuum heat shield, insulation cold chain, optical fiber cable, pesticide, leather treatment, extinction, cosmetics and other fields with higher gross profit added value)
Contact Us:
JINSHA PRECIPITATED SILICA MANUFACTURING CO.LTD.
Email.: jk@jksilica.com
Add.: Gaosha Industrial Zone, Shaxian, Fujian, China
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Room 908, Taiwan Street No.290, Xiamen, China
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