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Method for preparing chlorinated polyvinyl chloride resin

A chlorinated polyvinyl chloride and resin technology, applied in the field of preparation of chlorinated polyvinyl chloride resin, can solve problems such as inability to effectively remove HCl, CPVC white index deterioration, etc., achieve excellent thermal stability, excellent white index, and reduce costs Effect

Active Publication Date: 2018-12-21
HANWHA CHEMICAL CORPORATION
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] However, due to the additional generation of CO 2 and hypochlorite, the existing alkaline substances as mentioned above cannot effectively remove residual HCl, therefore, the whiteness index of CPVC may be deteriorated

Method used

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  • Method for preparing chlorinated polyvinyl chloride resin
  • Method for preparing chlorinated polyvinyl chloride resin

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preparation example Construction

[0041] Preparation steps of CPVC

[0042] Although the step of synthesizing CPVC can be carried out according to a conventional known method, and the configuration is not particularly limited, it can preferably be carried out as follows.

[0043] For example, the chlorination reaction can be carried out by introducing PVC or a PVC-containing copolymer into a reactor, then removing oxygen under vacuum, introducing hydrochloric acid, and then carrying out a photoreaction by UV irradiation while raising the temperature .

[0044] The PVC or PVC-containing copolymer used in the chlorination reaction can be used in the state of a slurry containing a solvent. The slurry may contain water used in the polymerization, and the ratio of PVC to water may be 10 to 35% by weight. Here, the kind of the solvent to be introduced is not particularly limited, and water can be used.

[0045] The PVC or PVC-containing copolymer can be prepared by copolymerization of vinyl chloride monomer alo...

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Abstract

The present invention relates to a method for preparing a chlorinated polyvinyl chloride resin and, more specifically, provides a method for preparing a chlorinated polyvinyl chloride resin, capable of: effectively removing leftover hydrochloric acid from the pores of a chlorinated polyvinyl chloride resin, which is obtained during a chlorination process of PVC or PVC-containing copolymers, by using, as a neutralizer, a mixture of a percarbonate-based compound or a carbonate-based compound and hydrogen peroxide; and improving thermal stability, resin color difference and process color difference.

Description

technical field [0001] Cross References to Related Applications [0002] This application claims the benefit of Korean Patent Application No. 10-2016-0026380, filed with the Korean Intellectual Property Office on Mar. 04, 2016, the disclosure of which is incorporated herein by reference in its entirety. [0003] The present invention relates to a method for preparing a chlorinated polyvinyl chloride (CPVC) resin using a photoreaction, and more particularly, to a method for preparing a chlorinated polyvinyl chloride resin, which can be prepared by using a specific Neutralization step of neutralizer to improve color difference and thermal stability. Background technique [0004] CPVC results from the chlorination of PVC. Due to the high chlorine content compared to existing PVC, CPVC has excellent mechanical properties, heat resistance and chemical resistance, and is used in various products such as water pipes, industrial pipes, sprinkler pipes, adhesives, etc. [0005] D...

Claims

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Application Information

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IPC IPC(8): C08F8/20C08F214/06C08K3/26C08K5/14C08L23/28
CPCC08F8/20C08F214/06C08K3/26C08K5/14C08L23/28
Inventor 李祐荣尹美景金良中陈善正权赫七
Owner HANWHA CHEMICAL CORPORATION
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