some of the main principles of the processing aid for processing

1, the role of the principle of PVC processing aids melt due to poor scalability, easily lead to melt broken; PVC melt relaxation slow, easily lead to the product surface rough, dull and shark skin and so on. Therefore, processing often requires the addition of PVC processing aids to improve the melt processing aids described above is the lack of processing performance can be improved resin additives, and its main role in three ways: to promote the molten resin to improve the rheological properties of the melt lubrication and promote the molten resin to give: PVC resin in the WSD PVC flame retardant  heated state, when the shear force under certain melt processing modifier first melted and adhered to the surface of the PVC resin particles, its compatibility with the resin and Its molecular weight, the viscosity of PVC and increasing the friction, and thus the shear stress and the effective heat transfer to the PVC resin, melt rheology improving the acceleration performance of the molten PVC: PVC has a melt strength is poor, poor ductility, and melt fracture shortcomings, and to improve the melt processing of said modifier rheology. Its mechanism of action: Increase the PVC melt viscoelasticity, thus improving the die swell and melt strength gives improved lubricity: PVC processing modifier is compatible with the first portion of the melt, plays the role of promoting the melt; but not with PVC Compatible part WSD Polyethylene wax  migrate to the outside of the molten resin system, thereby improving the releasability of the copolymer 2, a conventional processing modifier ACR ACR methyl methacrylate and acrylate, and styrene monomers. In addition to be used as a processing aid, it can also be used as impact modifiers. PVC plastic window profiles or generally used ACR201 ACR401, in an amount of 1.5-3 parts of a modified impact modifier polymer content is important to improve the impact resistance, PVC resin is a non-polar high crystallinity there is a strong interaction between the oligomer molecule, is a hard and brittle material; low impact strength. After the addition of impact modifiers, elastomeric impact modifier particles can be raised to reduce the total stress crazing and  WSD zinc stearate its particle deformation and shear band and prevent crazing expansion and growth, absorb the impact of the transmission of the body material able to achieve the purpose of impact. Small particle modifier to facilitate increasing the number of unit weight or unit volume of a modifier to increase the effective volume fraction, thereby enhancing the ability of stress dispersion. Currently used widely for organic impact modifier.