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Method for preparing vinyl chloride-based polymer

A vinyl chloride and polymer technology, applied in the field of vinyl chloride-based polymers, can solve problems such as reduced bulk density, achieve the effects of reduced chlorination reaction time, increased productivity, and excellent whiteness index

Active Publication Date: 2019-05-24
HANWHA CHEMICAL CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, in general, the porosity and bulk density of PVC are contradictory properties, and if the porosity of vinyl chloride resin increases, the bulk density may decrease

Method used

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  • Method for preparing vinyl chloride-based polymer
  • Method for preparing vinyl chloride-based polymer
  • Method for preparing vinyl chloride-based polymer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0077] To a 5L reactor, the reaction initiator and PVA-1, HPMC and PVA-2 suspending agents and 2000 g of deionized water were introduced as described in Table 1 below, and then a vacuum was applied to the reactor using a vacuum pump to remove oxygen in the reactor. Subsequently, 1000 g (100 parts by weight) of VCM was introduced into the oxygen-depleted reactor, and the temperature of the reactor was raised to 58° C. to initiate polymerization, and then a stable standard pressure inside the reactor was confirmed. Thereafter, while maintaining the temperature, the reaction was carried out for 300 minutes, and then when the internal pressure of the reactor decreased by 1.1 kgf / cm compared with the standard pressure 2 , the polymerization was completed, whereby a suspension in which the vinyl chloride-based polymer was dispersed in deionized water was obtained. The suspension was dehydrated and dried to obtain the vinyl chloride-based polymer in the form of spherical particles. ...

Embodiment 2 to 4

[0079] A vinyl chloride-based polymer was obtained by the same method as in Example 1, except that PVA-1, HPMC, and PVA-2 suspending agents were used as described in Table 1 below.

experiment Embodiment 1

[0089] Properties of the vinyl chloride-based polymers prepared in Examples 1 to 4 and Comparative Examples 1 to 3 were measured as follows, and the results are shown in Table 1 below.

[0090] 1) Average particle size (APS): Measured using a Mastersizer 3000 particle size analyzer (manufactured by Malvern Corporation).

[0091] 2) Dioctyl phthalate absorption rate (CPA): Measured at 25° C. according to ASTM D3367.

[0092] 3) Bulk density (B.D.): Measured according to ASTM D1895-90.

[0093] 【Table 1】

[0094]

[0095] As shown in Table 1, it can be seen that in the case of Comparative Example 1 in which the PVA-3 suspending agent with a degree of saponification of 80 mol% was used alone, the vinyl chloride-based polymer had the largest average particle diameter, and the lowest CPA.

[0096] In contrast, in the case of Examples 1 to 4 in which PVA-1, HPMC, and PVA-2 were used in combination as a suspending agent, with Comparative Example 2 in which PVA-3, HPMCA, and PVA...

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Abstract

According to the present invention, a method for preparing a vinyl chloride-based polymer can prepare a vinyl chloride-based polymer which has a small average diameter and high porosity and bulk density and is polymerized in the presence of a polyvinyl alcohol (PVA)-based suspension and a hydroxypropyl methylcellulose (HPMC)-based suspension, which are two types having different degrees of saponification. In addition, a chlorinated vinyl chloride-based resin obtained by chlorinating the vinyl chloride-based polymer is prepared within a short chlorination reaction time and simultaneously exhibits improved whiteness.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of Korean Patent Application No. 10-2016-0113224 filed with the Korean Intellectual Property Office on September 2, 2016, the disclosure of which is incorporated herein by reference in its entirety. technical field [0003] The present invention relates to a process for the preparation of vinyl chloride-based polymers with high porosity and high bulk density, which can produce chlorinated chlorinated polymers with improved whiteness in a short chlorination reaction time vinyl chloride based resins. Background technique [0004] Chlorinated vinyl chloride resins are produced by chlorination of polyvinyl chloride (PVC) and are known as chlorinated polyvinyl chloride. This CPVC has excellent mechanical properties, heat resistance and chemical resistance due to its high chlorine content compared to existing vinyl chloride resins, and thus is used in various applications such as water pi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F2/20C08F14/06C08F8/20C08F2/38
CPCC08F2/20C08F2/38C08F8/20C08F14/06
Inventor 南宫智恩尹美景陈善正权赫七
Owner HANWHA CHEMICAL CORPORATION
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