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The purpose of adding lubricants in the production of PVC profiles is to reduce the friction between the materials and the surface of the materials and processing equipment, thus reducing the flow resistance and viscosity of the melt to improve the fluidity of the melt, avoiding adhesion between the melt and the equipment, improving the surface finish of the products, etc. When using a PVC profile production line production, the use of appropriate lubricants can improve the quality of the product and also protect the equipment. So what lubricants can be used in the production of PVC profiles?
Here is the list of contents
What are the functions of lubricants?
What are the lubricants?
According to different molding methods, the lubricant's lubrication role focuses on different aspects, mainly the following.
Calendering: to prevent the melt from sticking to the rolls.
Injection molding: to improve flow and release.
Extrusion molding: to improve the flow and improve the separation of the mouth and die.
Compression and lamination molding: facilitate the separation of platen and product.
According to the composition of lubricants, there are mainly saturated hydrocarbons and halogenated hydrocarbons, fatty acids, fatty acid esters, aliphatic esters and amines, metal soaps, fatty alcohols, and polyols, etc. According to the role of lubricants, they are classified into internal and external lubricants. They are distinguished according to the compatibility size of lubricant and resin. The internal lubricant has a high affinity with resin, and its function is to reduce the intermolecular force; the external lubricant has a low affinity with resin, and its function is to reduce the friction between resin and metal surface. The difference between internal and external lubricants is only relative, and there is no strict classification standard. In the resin with different polarities, the role of internal and external lubricants may change. For example, stearic acid alcohol, stearic acid amide, butyl stearate, and monoglyceride stearate are internal lubricants for polar resins, such as PVC and PA, but external lubricants for non-polar resins, such as PE and PP. On the contrary, polymer paraffin waxes are not compatible with polar resins, so they can be used as external lubricants in polar PVC, but as internal lubricants in non-polar resins, such as PE and PP. The role of internal and external lubricants will also change under different processing temperatures. For example, stearic acid and stearyl alcohol are used in the early stage of PVC calendering, because the processing temperature is low at this time and the compatibility with PVC is poor, so they mainly play the role of external lubricant; when the temperature rises, the compatibility with PVC increases, so they turn to play the role of internal lubricant.
When using a PVC profile production line for PVC profile production, choosing suitable lubricants can effectively improve the quality of the products and increase the efficiency of the PVC profile production line. With years of production experience and advanced technology, Zhangjiagang Chenxing Machinery Co., Ltd can provide a high-quality and high-performance profile production line. And we have a professional team that can provide professional pre-sales consulting service and after-sales maintenance service. If you are interested in our products and want to get more detailed information, welcome to contact us, we are looking forward to your visit!
