pvc inside and outside the role of lubricant is to improve the resin in the plastic processing fluidity and the release of products, to prevent the machine or die due to adhesion defects. Generally added to the molding compound or coated on the cavity surface. Commonly used lubricants are fatty acids and their salts, long-chain aliphatic hydrocarbons. According to the different mechanism of the role of lubricant can be divided into external lubricant and internal lubricant.
(1) Outer lubricant: This lubricant has poor compatibility with the molding resin and is therefore commonly used in forming machines or molds to form a lubricating layer with the resin to facilitate resin flow and product release , Such as paraffin.
(2) Lubricants: Such lubricants and resin compatibility, often incorporated into the resin, reducing the melt viscosity of the resin to improve its mobility. Such as butyl stearate, lead stearate and the like. Stearic acid salts are both good lubricants and effective stabilizers.
With the rapid development of industrial technology, by the 1970s, various hard products (such as pipes, sheets, plates, profiles, etc.) made from PVC abroad have been rapidly developed, and these different hard products are different due to different The needs of processing equipment and technology, PVC lubricants, whether from the variety or quantity have put forward more requirements, therefore, this demand will also promote the continuous development of lubricant products and production.
At the same time, it is clear that the use of pvc lubricant inside and outside quickly promoted the development of pvc products, while improving economic efficiency.