Meishen
Silicone rubber
has high temperature, low temperature, weather resistance, ozone resistance and
other excellent properties.
It
has been widely used in various fields of national economy.
However,
silicone rubber is flammable and will continue to burn, and to some extent
limits its use in electrical and electronic, wire and cable, automotive,
aerospace and other fields.
The
following small series to introduce the flame retardant silica gel added in
magnesium hydroxide will have what effect.
When
magnesium hydroxide was added to silicone rubber, the limit oxygen index
increased and increased with the increase of magnesium hydroxide dosage.
Magnesium
hydroxide treated by organosilicon was evenly dispersed in silicone rubber, and
the aggregate particles were small. Magnesium hydroxide particles were closely
combined with silicone rubber, and the interface compatibility with silicone
rubber was improved.
Magnesium
hydroxide in the decomposition process will absorb a lot of heat in the
combustion area, reducing the temperature of the combustion.
At
the same time, the resulting water vapor can dilute the flammable gas, and it
can also isolate the contact between silicone rubber and oxygen, thus acting as
a flame retardant.
In
order to expand the range of silicone rubber, flame retardant modification has
become one of the main research directions.
Early
flame retardants used in silicone rubber mainly include decabromodiphenyl
ether, chlorinated paraffin and other halogen flame retardants, and phosphorous
flame retardants such as red phosphorus and phosphate ester.
Although
these flame retardants have good flame retardant effect on silicone rubber,
they do great harm to the environment due to the harmful gases released during
combustion.
However,
magnesium hydroxide will help to improve its dispersion in silicone rubber,
improve its interface compatibility with silicone rubber, so that silicone
rubber has flame retardant while maintaining good mechanical properties.
All
in all, magnesium hydroxide has a good flame retardant effect on silicone
rubber.
The
flame retardant effect of silicone treated magnesium hydroxide is better than
that of stearic acid treated magnesium hydroxide and untreated magnesium
hydroxide.
That's
what adding magnesium hydroxide to the flame retardant silicone does.
I
hope I can help you.