What is pvc profile?
Pvc profile is an industrial and household pvc product, which is made by adding various functional additives to pvc resin and extruding at high temperature. According to performance, it can be divided into two categories, hard and soft. Rigid PVC profiles are mainly used in buildings. For example, pvc doors and windows, pvc floors, pvc pipes and so on. Soft pvc materials are used for pvc hoses, transmission cables, etc. After adding functional additives, the properties of pvc are more abundant. It will be anti-aging, anti-ultraviolet, anti-corrosion, high strength and low price, so some people are willing to try to replace aluminum profiles, steel and so on.
Processing AIDS for pvc profiles
1.？ Action principle of pvc processing AIDS
Due to the poor ductility of pvc melt, it is easy to break the melt and relax the pvc melt, which easily leads to defects such as rough and dull surface of the product. Therefore, in order to improve the defects of pvc melt, processing AIDS are often added. There are three main functions of processing AIDS: promoting resin melting, improving melt rheological properties and imparting lubricity.
Promoting resin melting: when pvc resin is heated and melted under a certain shear force, the processing AIDS firstly melt and adhere to the surface of pvc resin particles, which increases the viscosity and friction of pvc, effectively transfers shear force and heat, and accelerates pvc melting.
Improve the rheological properties of melt: processing AIDS can improve the poor melt strength, poor ductility and melt fracture of pvc. Its principle is to increase the viscoelasticity of pvc melt, thus improving extrusion swell and improving melt strength.
Giving lubricity: firstly, the part of the processing aid compatible with pvc melts to promote melting, while the part incompatible with pvc migrates outside the molten resin system, thus improving the demoulding performance.
2.？ Common processing AIDS for PVC
ACR processing AIDS: ACR is a polymer of methyl methacrylate and monomers such as acrylate and styrene. It can be used as both processing aid and modifier. The important role of ACR processing AIDS is to promote the plasticization of pcv, shorten its plasticization time, improve the plasticization uniformity of melt and reduce the plasticization temperature.
Light-stable processing AIDS: pvc profile products are mostly exposed to light and other kinds of light. According to the use environment of the product, adding a certain amount of light stabilizer during the processing can prevent and reduce the decomposition and aging of the product and prolong the service life of the product.
Do you think it's amazing to hear me say so much? The principle of materials is so complicated. You don't know how much processing is needed for objects of different colors and shapes that we see in our lives. Today, minibus happily shared some new knowledge with friends. The minibus will make persistent efforts to learn more and share more new knowledge for everyone. Look forward to our next meeting!