General
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Microcrystalline Wax is defined as a refined mixture of solid, saturated
hydrocarbons, mainly branched paraffin, obtained from petroleum.
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It is
a colourless or white, somewhat transluent, tasteless and odourless wax.
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Microcrystalline wax is insoluble in water, very slightly soluble in
ethanol, sparingly soluble in diethyl ether and hexane.
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Microcrystalline wax contains a higher percentage of isoparaffinic
(branched) hydrocarbons and naphthenic hydrocarbons.
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It is
characterized by the fineness of its crystals in contrast to the larger
crystal of paraffin wax. It consists of high molecular weight saturated
aliphatic hydrocarbons.
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Typical microcrystalline wax crystal structure is small and thin, making
them more flexible than paraffin wax.
Process
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Sludge, dirt, moisture and foreign matter must first be removed from the
tank-bottom during vaccum distillation of oil refining.
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The
wax-containing substance obtained by refining the tank-bottom in this
way is treated with sulfuric acid, and deasphalted with propane or by
other treatment to reduce the asphalt and colored material in it.
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It may
also be treated with fuller's earth to further improve the color. Oil is
then removed by distillation until an appropriate concentration is
achieved for the wax.
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The
substance thus obtained is considered as the wax raw material and
treated just as if it were petrolatum. It is treated mostly by solvent
method to produce a high melting point wax.
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For
making wax from petrolatum, solvents are used for deoiling. The crystals
of this wax are normally microcrystalline in form.
Applications
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In
rubber industry as an additive to provide softness, lustre and
weathering protective for household & industrial rubber goods.
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It is
used as an ingredient of rubber compounding in tyre industry to provide
protection against action of light, oxygen & ozone.
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The
unique property of MCW to bind oil with other liquids is used for
manufacture of jellies required for industrial, pharmaceutical and jelly
filled telecommunication cable applications.
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Wax
solutions are used in the calibration of lab glassware, polishes. It is
also used in cosmetics and textile finishing.
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