2014年8月26日星期二

WSD intenal lubricant Classification and mechanism of action of the lubricant

  In the plastics industry mainly used as PVC lubricants mold release agents, plasticizers, antistatic agents, especially for plastic foam products, anti-shrinkage agents. In the production of  PVC lubricant  as an internal lubricant, and can be used as an alkyd resin modifier, a plasticizer of cellulose nitrate. Lubricants [1] The resin is effective for improving the fluidity and plastic processing products releasability to prevent adhesion of the machine or mold, and internal defects.  
  General increase in the mold cavity plastic or coated surfaces. Common lubricants are fatty acids and their salts, long chain aliphatic hydrocarbons. Depending on the Plastic lubricants of action of the lubricant can be divided into external lubricants and internal lubricants. (1) external lubricants: the lubricant with a poor compatibility with the molding resin, so commonly used in the molding machine or the mold, forming a lubricating layer between it and the resin, the resin flow and easy demolding , such as paraffin. (2) Lubricants: Lubricants such good compatibility with a resin, often incorporated into the resin, the lower the melt viscosity of the resin, to improve its flowability. Such as butyl stearate, lead stearate. Stearic acid salts are both good lubricant, but also to be effective stabilizers.


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