Production method for chlorinated vinyl chloride resin

A technology of chlorinated vinyl chloride and a manufacturing method, which is applied to the manufacturing field of chlorinated vinyl chloride resins, and can solve the problems of poor heat resistance stability, no control, and inability to obtain transparent molded products.
CN106103501AInactive Publication Date: 2016-11-09SEKISUI CHEM CO LTD +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SEKISUI CHEM CO LTD
Publication Date
2016-11-09
Estimated Expiration
Not applicable · inactive patent

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Abstract

The present invention provides a production method for a chlorinated vinyl chloride resin that has excellent heat stability (initial colorability, and heat-resistance stability) and that can be used to obtain a transparent molded product. The present invention is a production method for a chlorinated vinyl chloride resin wherein a reaction liquid that comprises a vinyl chloride aqueous suspension that contains a vinyl chloride resin is thermally chlorinated in a sealable reaction vessel, the production method having a step (1) wherein the reaction liquid is heated, chlorine is introduced into the reaction vessel when the temperature is 55-70 DEG C, and thermal chlorination is started, a step (2) wherein the temperature inside the reaction vessel is increased while being kept at or below the glass transition temperature of a partially chlorinated vinyl chloride resin, and a step (3) wherein, after the chlorine content percentage of the partially chlorinated vinyl chloride resin is 58 weight% or more, thermal chlorination is performed at a prescribed temperature that is 85 DEG C or more but less than 115 DEG C. In steps (1)-(3), the net agitation power (Pv) inside the reaction vessel is 0.2-2.5 w / m3 per 1 m3 of the reaction liquid.
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Description

technical field

[0001] The present invention relates to a method for producing a chlorinated vinyl chloride-based resin having high initial coloring properties, high heat resistance stability, excellent thermal stability, and a transparent molded product. Background technique

[0002] Chlorinated vinyl chloride resins are produced by post-chlorination of vinyl chloride resins, and have the advantages of vinyl chloride resins, such as excellent weather resistance, flame retardancy, and chemical resistance, and are compatible with vinyl chloride resins. It is 20 to 40°C higher than the heat deflection temperature, so it can be suitably used in applications requiring heat resistance of 100°C, such as heat-resistant pipes, heat-resistant joints, heat-resistant valves, and heat-resistant plates.

[0003] However, since chlorinated vinyl chloride resins have a high heat distortion temperature, they must be heated and melted at high temperatures in order to be molded into heat-resi...

Claims

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