Chemical Plastic

April 7, 2010

Release Agent – Classification and Properties

Release agent can be divided into high polymer class, such as polysiloxane, organic fluorine polymers, and inorganic or organic class.

and chlorine-free halothane class, water-based release agents is in the trend.
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The most general and usual release agent is methyl silicone oil used with performance as follows:

Colorless, odorless and transparent viscous liquid, with different molecular weight, the dynamic viscosity differs from 1 to 104 Pa • s, it is soluble in benzene, toluene, xylene, ethyl ether, etc., the refractive index is 1.38 ~ 1.40, density 0.82 ~ 0.97 g / cubic centimeter, thermal conductivity coefficient of 0.00028 ~ 0.00044 W / (m • 1 000), boiling point 152 ~ 250 ?, flash point 110-600 ?. So different viscosity has different nature.
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Methyl silicone oil often used in high-temperature mold release of large-scale injection molded parts.

As to inorganic release agents, there are talc, mica, molybdenum disulfide, white clay, clay and so on, mixed with other assistant additives into release agent, and used in rubber industry generally.
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As to organic release agents there are fatty acid soap (sodium soap, zinc soap, etc.), fatty acid, paraffin, white oil, vaseline, etc., essentially they can be considered as of inner lubricant or outer lubricant of plastic

In addition to methyl silicone oil, high polymer release agent also includes low molecular weight polyethylene, which is also a type of lubricant and dispersant, polyethylene glycol, epoxy derivatives, fluorine compounds.

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