intenal lubricant widely used in the actual processing

Lubricants plastic widely used in the actual processing of plastic, for example kneading, the rolling process, to prevent adhesion of the polymer cartridge suppressing friction and heat, and the load torque decreases kneading, thereby preventing the polymer
material of the heat deterioration. In the  WSD PVC flame retardant extrusion molding, to improve flowability, the polymer material and to improve adhesion
of the barrel and the die, to prevent and reduce retentate. Another film but also to improve the appearance and gloss.
Plastic lubricants can be divided into effect, the two plastic lubricants, intenal lubricant is mainly to improve the frictional
heat the metal surface of the polymer melt and processing equipment. Lubricants plastic outer poor compatibility with the polymer is easy to migrate out from the melt, so the lubrication can be formed in a WSD Processing aid  thin layer of plastic and metal melt interface. Plastic lubricant has good compatibility with the polymer, intenal lubricant which serves to reduce the effect of cohesion between
the polymer molecules within the polymer, thereby improving the plastic melt in the heat of friction and melt flowability. Commonly used lubricants are stearic acid and salts thereof outside; plastic lubricant is a low molecular weight polymer. A plastic lubricant with different polymers under different processing conditions or exhibit different lubrication, such as high temperature,
high pressure, the lubricant will be squeezed out of the inside and outside of the lubricant becomes.

intenal lubricant viscosity is one of the most important parameters of oil

Viscosity of oil is the most important parameter, which determines the sliding bearing oil film bearing capacity, the friction
power and the sealing capability of the sealing surface. Carrying capacity of high-viscosity lubricants large, easy to maintain
liquid lubrication, but its flow resistance, increasing the Plastic impact modifier  power and start the compressor friction resistance. Conversely, a low
viscosity lubricating oil flow resistance is small, less heat generated by friction, it is difficult to form oil film seal is poor.
Mixed with the working fluid and the working fluid is mixed well, the free flow of oil in the system, a smooth return to the
compressor, intenal lubricant to ensure the  Calcium stearate normal lubrication of the compressor. Instead, the lubricating oil in the system will

produce stratification, flow resistance is increased in the cycle, the heat transfer to weaken, resulting in insufficient oil
return to the compressor, intenal lubricant properties and thus the reliability of the compressor adverse consequences.
When the cloud point under given conditions, the temperature of the lubricating oil falls below a certain value, the oil begins to
precipitate in the wax, into a turbid state, this is Titanium dioxide rutile called the cloud point temperature of the lubricating oil. Oil cloud point
should be less than the minimum refrigerant evaporation temperature, otherwise precipitated paraffin clog the throttle, or weaken
the effect of the evaporator heat. Even clogged's tube evaporator channels. The maximum temperature in the freezing point of a
given condition, the lubricating oil at the start completely lost its flowability of gravity referred to the freezing point. Easy
come, the freezing point should be as low as possible.

The main role of intenal lubricant and its presentation

 intenal lubricant When the temperature reached 190 ℃, the primary particles begin to melt , polar lubricant , because good
compatibility with polyvinyl chloride , polyvinyl integrate most of the melt, the melt from the plasticizing effect in the . Due to
the non-polar lubricant solution compatible with Titanium dioxide rutile  the PVC melt is very small, most of the surface and pressed onto the interface
between the melt processing equipment , then, the metal melt is not a direct movement contacts , but with the viscosity of the lubricant liquid layer small stationary contact , the friction coefficient is less than a direct contact with the metal to be
smaller , which play an external lubricant is a lubricant such reasons . Tofurther illustrate the various stages of different
plastics processing requirements for lubricants , now extrusion PVC example: internal and external lubricant to illustrate the
major role played by the various parts of the processing machinery . Early  lubricant effect. This is a segment from the feed
zone to compress the time zone. PVC is mixed in the region and starts plasticization . Here the lubricant required to increase the
fluidity of the plastic to ensure smooth Calcium stearate  feeding . Therefore , in this region the main functions within the lubrication .  mid-
lubricant effect area. This is the region of the compression section to the metering section , and plasticized polyvinyl chloride
powder is completed here , in this process, the lubricant is required to reduce the friction during the flow of plastic to ensure
that the melt flow . Therefore , in this area mainly outside the lubrication function , intenal lubricant within the lubricant can
be reduced , but the melt flow , is also indispensable .  post lubrication. This is from the metering section to the metal mold
area. Here the melt is pressurized and fed into the molding die . In this region, the lubricant can reduce the required adhesion
between the melt and the mold surface , to facilitate the release , it is still the primary role of the lubricant . Since the
integral process , the general inner and outer lubrication of both the lubricant or lubricant compound . The role of the second
chapter of a lubricant to reduce melt viscosity in general, low melt viscosity , good fluidity , easy molding . Increasing the
temperature increases the thermal energy of the molecular motion , the relative reduction of the intermolecular forces , the melt
viscosity decreased, increased mobility . Polyvinyl chloride resin decomposition temperature of about 130 ~ 140 ℃, well below the
processing temperature of rigid PVC (185 ~ 205 ℃), so that by increasing the temperature to reduce the viscosity of the resin melt
is limited. Therefore, raising the temperature also means increased energy consumption , while extending the product cooling time ,
reducing production efficiency. Reducing the Stabilizers for pipe  molecular weight of the resin , the resin viscosity can be reduced while also reducing
the Vicat softening point and other mechanical properties. Adding a lubricant , and its purpose is to reduce the melt viscosity of
the resin to improve the fluidity of the polymer . 2 , to promote inter- capillary adsorption ( chemisorption ) Due to the
plasticizing effect of the lubricant with polar , plasticized resin is formed in front of the gap between the resin particles to
the segment between the resin particles and molecules . Junction by polar group phase lubricant into Los combined with resin chain , thus weakening the force between the resin particles and molecules between thechain is broken . In this case, the branch
subjected to heat and shear force , the molecular chains of the resin can be easily entangled original stretch , each expansion ,
penetration, the boundaries between the resin particles disappear , thus promoting plasticization . 3, to reduce the frictional
heat , the friction material is typically a thermoplastic , resin melt production process requires sufficient melt strength to
produce . Example ① rolling production process - plate production . Requested the extension of the melt resin peeling rollers ,
there must be adequate melt strength. Example ② blow molding production - blowing production . Requirements melt sufficient melt
strength to ensure that when a plastic , not because of increased melt strength and melt enough natural droop , resulting in
products of uneven thickness . The melt strength and melt viscosity of the size are dependent on the size of the force in the resin
between molecular chains . Therefore, in general, the melt strength and melt viscosity of the resin between the resin in the
molecule are different in different circumstances such that the expression of the role . The melt strength and melt viscosity
generally proportional to : the greater the melt strength, melt viscosity increases. The greater the melt viscosity of the resin ,
molding the greater the shearing force . The greater the shear force , the greater the friction . The principle for easy
decomposition characteristics of PVC is extremely unfavorable , can cause localized overheating within the resin decomposition.
Quality of both internal and external lubricants lubricants , lubricating parts of the outer rigid PVC can reduce frictional heat.
Internal lubrication also reduces the viscosity and the melt strength of the resin . Therefore, reducing the melt viscosity of the
resin , reduce friction heat , friction, force must be reduced within the resin molecules. Reduction of the interaction between the
resin melt , resulting in decrease in strength of the resin melt . G32-1 compound grease polar functional group is to reduce the
viscosity of the polyvinyl chloride resin , plasticized promote critical . Increasing the polarity of the non-polar group and a
lubricated interface PVC , PVC space segment only increased displacement or movement of the base to increase lubricity and reduce
internal friction and due to friction movement of the segments caused by displacement or generation of heat . 4 , a mixture of a
polar resin adhesive adhering hot metal surfaces of processing equipment is veryimportant . Initial feed processing equipment ,
low temperature, the resin mixture adhesion to metals , such as proper adhesion of the screw and barrel in the extrusion process .
In the calendering process , such as appropriate viscosity resin roller double roller can effectively heat and mechanical energy
conduction promoting plasticization . If the material over adhesion, the polymer local residence time is too long, causing
localized overheating of materials , thermal degradation , affecting product quality and appearance. If alone , such as : PE wax,
paraffin wax , stearic acid and other non -polar materials will " slip " is not conducive to rapid production . Adding an
appropriate amount G32-1 polymer composite lubricant grease to balance a reasonable balance mechanism in the polymer is the key . 5 , the delay in the plasticized polyvinyl chloride resin blend , the PE melting wax, paraffin wax , stearic acid and other non -
polar substances , wetting of the resin solid particles