タイトルまたは説明
ï¬The
Production Principle and Application of Precipitation
Silica
The
chemical formula of white carbon black is SiO2nH2O. Because its use
is similar to that of carbon black and white, it is named white
carbon black. White
carbon
black can be divided into precipitated white carbon black
(precipitated hydrated silica) and white carbon black (gas phase
silica) according to the different
production methods. The production methods of the
two products are different, and the properties and uses are also
very different. Gas phase method
production
is
mainly the use of Silicon tetrachloride and air combustion of
silica, fine particles, the median particle size can reach 5
microns or less. The precipitation
method
is to
use sodium silicate to add sulfuric acid to precipitate silica. The
median particle size is about ***2 microns. Gas phase method white
carbon black is
expensive, it is not easy to absorb moisture, and
it is more used as a dimmer in paint. The precipitation method is
cheap and easy to absorb moisture, mainly
used
in
rubber, plastic products as filling, reinforcing agent. The
products described below are produced by sulfuric acid
precipitation, that is, white carbon
black
precipitation method. The White carbon black
involved in the following is white carbon black precipitation
method.
ï¬The
main uses of white carbon black by
precipitation
Since
the industrialization of black carbon products in the ***0s, it has
been widely used as a tonic in rubber products. It can also be used
in the pharmaceutical
industry, pesticides, ink, paint, paint,
toothpaste, paper, food, feed, cosmetics, and batteries, and other
industries. The main application industries of white
gray
black are briefly
introduced:
1)
Tire industry
The
use of white carbon black in the Tyre tread gel, especially the
highly dispersed precipitation method, and the use of white carbon
black and coupling agents
can
simultaneously increase the tire life(improve wear resistance) and
safety(improve moisture resistance) and reduce fuel
consumption(reduce rolling resistance).
In
addition, the precipitation method is used in the tire body and
strip layer to improve the adhesion between the adhesive material
and the wire cord; Replacing the
carbon
black part with the White carbon in the tire side glue can greatly
improve the durability of the rubber, improve the flexor resistance
and impact resistance.
2).
Rubber shoes and other rubber
products
(1).
White carbon has a high degree of black and white, fine particles,
high transparency in the use of white carbon black sulfide, and can
improve the
comprehensive physical properties of the adhesive.
Therefore, white carbon black is widely used in rubber shoe
production as the main filling agent, especially
in
transparent and translucent
soles.
(2).
In the production of adhesive tape, in order to improve its wear
resistance, a large increase in white carbon black, at the same
time, the White carbon black
surface of silane alcohol to improve the wet
degree of glue and fabric, conducive to the diffusion and
penetration of glue. In addition to the above products,
white
charcoal black is also used on rubber parts in
rollers, tubes, acorns, wires and cables, household appliances, and
sports articles
3).
Silicon rubber
The
application of silicone rubber began with the emergence of white
carbon black. Silicon rubber has high heat resistance and excellent
cold resistance, ozone
resistance, aging resistance and atmospheric aging
resistance, and at the same time has excellent electrical
insulation. Due to the above characteristics of
silicone
rubber, it is widely used in aerospace and
electronics industries. Gas phase white carbon black is expensive,
replacing gas phase white carbon black with
relatively
cheap
precipitation white carbon black, which can be used for the
production of low-grade Silicon rubber.
4). The pharmaceutical
industry
White
carbon black has physiological inertia, high absorption,
dispersion, and thickening, and has been widely used in
pharmaceutical preparations. For
example,
quasi-prime E powder now uses white carbon black
as a carrier.
5).
Pesticide industry
White
carbon black is mainly used as a carrier in the pesticide industry
to increase liquidity and prevent agglomeration. At present, white
carbon black is mainly
used
in various types of wettable powders.
6). In
the application of ink
White
carbon black in the ink mainly plays a thickening role, used to
control the flow of printing ink. It is also used to control the
flow of printer ink so that it cannot
flow
or hang freely to obtain clear printing.
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