The transparent material of PVC plastic granules is mainly composed of PVC resin and additives. The additives can be divided into heat stabilizers, lubricants, processing modifiers, fillers, anti-aging agents, colorants, etc. according to their functions. Before designing the formula of the main components of PVC, we should know the performance between PVC resin and various additives. The resin should be selected from polyvinyl chloride resin with a degree of polymerization of 1200-1000; a thermal stabilization system must be added. Select according to the specific requirements of production and processing, pay special attention to the synergistic effect and confrontation effect between heat stabilizers; add lubricating system appropriately. The lubricating system can reduce the mechanical load of processing and make the product smooth, but the excess will lead to the decrease of the strength of the welding angle; the addition of processing modifier can improve the plasticization quality and improve the appearance of the product; the addition of filler can reduce the cost and increase the rigidity of the profile, but it is not suitable for low temperature impact. The strength has a great influence, and the active light calcium carbonate with higher fineness should be selected. Appropriate addition of blue and fluorescent whitening agent can significantly improve the color and luster of the profile; in the design formula, it should be simplified as much as possible, do not add liquid additives as much as possible, and according to the requirements of the mixing process, the formula is divided into I in batches according to the feeding sequence. Material No., No. II and No. III are packaged separately.
