News_第8页_Novista Chemicals - The pioneer of Flame retardant

7 2023-12
Processing technology of chlorinated polyvinyl chloride (PVC-C) pipes - 2 When setting the process temperature, the curve should be kept as gentle as possible, which is beneficial to the plasticizing quality of the CPVC resin. The sudden rise and fall of the curve is not conducive to the plasticization of the pipe. Generally, a "U" shaped curve is more appropriate.
7 2023-12
Processing technology of chlorinated polyvinyl chloride (PVC-C) pipes - 1 1. ExtruderExtrusion processing of CPVC pipes usually uses parallel or conical twin-screw extruders.
7 2023-12
Formula composition of chlorinated polyvinyl chloride (PVC-C) pipes - 2 2. LubricantsThe role of lubricants and heat stabilizers are equally important.Adding too little, will cause processing difficulties, and even bring considerable damage to the equipment; adding too much, not only affect the quality of plasticization, but also reduce the Vicat softening temperature of the pipe. Therefore, how to balance the dosage of lubricant is the key, but als…
7 2023-12
Formula composition of chlorinated polyvinyl chloride (PVC-C) pipes - 1 Chlorinated polyvinyl chloride resin (hereinafter referred to as CPVC resin) was successfully developed in 1958 by BFGoodrich from USA, which is the product of chlorination of polyvinyl chloride resin (PVC resin).After chlorination of PVC, the chlorine content can be increased from 57% to 64% - 75%, with the increase in chlorine content, the corresponding temperature resistance,…
9 2023-11
The problems often appeared in PVC profiles and the summaries of causes 1. Surface discoloration yellowing:1.1 The formula is not stable enough, stabilizers and lubricants may not be properly matched,
8 2023-9
What is Acrylonitrile Styrene Acrylate (ASA)? ASA was originally developed as an alternative to acrylonitrile butadiene styrene (ABS). Both materials have similar mechanical properties and structures, but ASA is formulated by introducing a grafted acrylic ester elastomer (in the form of a powder) during the copolymerization of acrylonitrile and styrene. Formulating ABS, on the other hand, requires butadiene rubber. ASA also…
29 2023-8
The function and effect of Calcium stearate 1. As a PVC lubricant, it is an internal lubricant. Calcium stearate is a strong alkaline medium calcium stearate, the chemical active point of PVC resin particles can form a relatively stable complex system with it. The two long-chain alkyl groups of calcium stearate have poor compatibility with resins such as PVC, and a local microscopic two-phase interface, that is, a …
12 2023-8
Functions of Internal and External Lubrication of PVC Lubricant-3 Unbalanced External and Internal Lubrication Over and under lubrication affect the product quality as the processing suffers. Too much internal slippage results in large extrusion volumes and poor material plasticization. If the external slippage is too much, extrusion speed becomes fast, but plasticization is poor. It affects the internal performance and surface quality of the …