Description
Application in Rubber
Industry
(1)
Improve Air-Tightness of Rubber: Air-tightness is the
most important property for many rubber products, such as inner
tubes, ball bladders as well as many life-saving supplies, etc. To
increase the air-tightness of rubber, in addition to improve
processing and coating technology, it mainly depends on the nature
of the rubber itself and the filler. The better the air-tightness
of the rubber is, the better the anti-permeability of the product
is. Of course, this kind of rubber is quite expensive. Therefore,
using functional filler-wet ground mica powder, the cost will be
much lower and the effect will be good. Thats why when oil becomes
the major factor impeding the development of global economy, for
example since the oil crisis of ***0s, Goodyear, Sumitomo Rubber,
Bridgestone, Sipo Ting and other well-known companies have been
actively engaged in researching the application of mica
powder.
The barrier effect of wet ground
mica makes harmful substances have a difficult access into the
materials and also makes them difficult to spread, migrate or
penetrate even after they entered. The principles is similar to
that of coatings, that is, the parallel-oriented mica chips prevent
air from penetrating (penetration time will be extended by three
times), which is important for inner tubes of tires, bladders of
balls and many life-saving equipments. It doesnt have to be fine or
white mica, but the flaky structure must be perfect. In short,
adding wet ground mica into rubber, its air-tightness will increase
dramatically.
(2)
Insulation Performance: It is widely known that mica
can be used to improve the insulation performance of materials as
it has a very high rate of electric resistance. Rubber can be used
for wire and cable insulation materials, therefore, using wet
ground mica is very important. What should be mentioned is that
electric cables used in mine shafts, tunnels and on other similar
occasions, need to maintain its insulation in fire. Some countries
have developed a special class of insulating material composed by
silicone rubber (including organic boron resin) and mica powder and
so on. Such insulating materials will convert to a kind of
ceramic-like material at high temperatures, retaining good
insulating property and mechanical strength, thus enabling electric
cables to keep its insulation. What should also be mentioned is
that as iron will reduce the insulation performance of mica, dry
ground mica powder shall not be used for insulation
materials.
(3)
Sound and Vibration Damping Effects: Lots of sound and
vibration damping materials use rubber to change its
viscoelasticity and other physical traits to the desirable.
Wet ground mica powder with high diameter-thickness ratio can
change a series of physical modulus of materials. Whats more, the
energy reflection between chips (such as shock waves and sound
waves) will also absorb and weaken these energies. Accordingly,
"damping-chip" in vehicles and household appliances often add mica
powder. Similarly, many other sound and vibration damping materials
also used wet ground and dry ground mica powder.
(4)
Mold Release Agent in Moulding Curing of Rubber: In
many cases, the moulding curing of rubber will not use metal molds
or similar molds. The performance of mold release agent will impose
direct impact on production. For example, air bags are used into
the moulding curing of tire and if at this time high-performance
mold release agent is not used, then adhesion of molds and products
will be bound to happen, which will not only damage the mold, but
also cause a large number of defective products and then bring
enormous harm on production.
Such mould release agent commonly
uses lubricating grease, organic silicon, organic fluorine and
other materials. As solid lubricants plays an essential role, so
the modern type of this mould release agent will generally add in
mica. Wet ground mica powder, with perfect flaky and thin chip, has
a great ability of covering and shielding the surface of the mold.
Besides, the surface of wet ground mica chip is smooth, which can
effectively prevent adhesion of materials. Wet ground mica has a
high rate of purity, which makes the content of harmful impurities
binding rubber and mold becomes quite low, therefore, it is quite
applicable. Impurities, such as quartz, feldspar and other minerals
powder, are rough in surface and are not flaky in structure, which
is one of the important reasons for the difficulty of stripping.
While, for the difficulty of stripping with dry ground mica powder,
another reason is that the rough surface of the mica particle
itself makes it very adhesive. After adding wet ground mica, a kind
of air exhaust passage will be formed between the mold and the
rubber, thus preventing the gas retention within the gap and then
improving the physical appearance of products.
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