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Suspension Polyvinyl Chloride Resin

Overview

Suspension Polyvinyl Chloride (PVC) Resin is crafted via suspension polymerization, where vinyl chloride monomer disperses in water with suspension dispersants, aided by mechanical stirring. Initiated by a free radical initiator, the process involves steam stripping for residual monomer removal and centrifugal drying. Renowned for its versatility, it's used in extrusion, calendering, blow molding, injection molding, and foam molding, yielding a spectrum of flexible, rigid, and foamed products. This method, crucial in PVC production, employs water as the continuous phase, with dispersants easing tension between vinyl chloride monomer and water.

Key Features

Typically between 75 to 200 micrometers, with some reaching up to 350 micrometers, suitable for processing methods like calendering, extrusion, and injection molding.
High molecular weight particles remain unmelted during processing, necessitating control measures to prevent the formation of fish eye-like gels on the product surface, ensuring consistent appearance and mechanical properties.
Determined by the resin’s surface area and absorptive properties, affecting processing time and efficiency. Higher absorption facilitates shorter kneading times.
Suspension polymerized resin typically has a lower volatile content (<0.3%) compared to emulsion polymerized resin. Particle sizes ranging from 75 to 200 micrometers are suitable for calendering PVC synthetic leather production, while 75 to 120 micrometers are optimal for coating and scraping production methods.

Production Process Flow

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