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Polyvinyl chloride and method for producing same

A technology of polyvinyl chloride and its manufacturing method, which is applied in the field of polyvinyl chloride and its manufacture, can solve the problems that monomers cannot be added to the reactor and cannot be applied to mass production processes, etc., so as to reduce surface roughness, increase false specific gravity, and reduce The effect of the amount of fine powder

Pending Publication Date: 2022-05-06
FORMOSA PLASTICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when this method is used in industrial production, during the main polymerization reaction, the reactor generates high pressure, so that the monomer cannot be added to the reactor.
Therefore, these methods cannot be applied to the process of mass production

Method used

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  • Polyvinyl chloride and method for producing same
  • Polyvinyl chloride and method for producing same
  • Polyvinyl chloride and method for producing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] For the polyvinyl chloride in Example 1, 19 metric tons of vinyl chloride monomer, 9 kg of bis(2-ethylhexyl) peroxydicarbonate and 0.015 kg of Tween20 were added to the prepolymerization tank. When the reaction rate was 10%, the prepolymerization reaction was terminated to obtain a prepolymer. Then, the prepolymer is displaced in the main polymerization tank, and 14 metric tons of vinyl chloride monomer and 7 kg of peroxydicarbonate bis (2-ethylhexyl) ester and 5 kg of peroxy (trimethylacetic acid) tertiary Hexyl ester, carry out the main polymerization reaction, when the waiting reaction rate is 80%, terminate the main polymerization reaction. Then, unreacted vinyl chloride monomer was removed to obtain granular polyvinyl chloride of Example 1. These polyvinyl chloride particles were evaluated by the following evaluation methods, and the results are shown in Table 1.

Embodiment 2 to 3 and comparative example 1 to 5

[0066]The polyvinyl chlorides of Examples 2 to 3 and Comparative Examples 1 to 5 were all produced in a manner similar to that of Example 1. The difference is that in Examples 2 to 3 and Comparative Examples 1 to 5, the type and weight of the surface modifier were changed, and Tween20 in Example 3 was added to the main polymerization tank. The specific conditions and evaluation results are shown in Table 1 below.

[0067] Evaluation method

[0068] 1. Average particle size test

[0069] The average particle size test uses a shaking sieve machine (manufactured by SEISHIN, its model is RPS-205), and the average particle size of the polyvinyl chloride particles is measured by the sieving method and according to the American Society for Testing and Materials (ASTM) E11 standard method.

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PUM

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Abstract

The invention relates to polyvinyl chloride and a manufacturing method thereof. The manufacturing method comprises a prepolymerization reaction and a main polymerization reaction. The prepolymerized particles generated by the prepolymerization reaction and the main polymerized particles generated by the main polymerization reaction are bonded with each other to form polyvinyl chloride particles. The surface modifier which is added in the prepolymerization reaction and / or the main polymerization reaction and has a specific hydrophilic-lipophilic balance value is beneficial to bonding of the prepolymerization particles and the main polymerization particles, so that the surface roughness of the polyvinyl chloride particles is reduced, and the amount of fine powder generated by friction between the polyvinyl chloride particles is reduced; under the condition that the oil absorption amount of the polyvinyl chloride particles is not changed, the apparent specific gravity of the polyvinyl chloride particles is improved.

Description

technical field [0001] The present invention relates to a polyvinyl chloride and its manufacturing method, and in particular to a polyvinyl chloride with low fine powder content and high false specific gravity and its manufacturing method. Background technique [0002] The production method of polyvinyl chloride can include suspension polymerization method, emulsion polymerization method and bulk polymerization method (bulkpolymerization), wherein the surface of the polyvinyl chloride particle produced by bulk polymerization method has no film, so in the polymerization reaction stirring and conveying process, polyvinyl chloride Vinyl chloride particles will rub against each other and even break apart to produce fine powder and reduce the true specific gravity of these particles. [0003] When the amount of fine powder is too high, the fine powder is likely to float in the working environment, pollute the environment, and may be inhaled into the human body, causing health pro...

Claims

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Application Information

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IPC IPC(8): C08F114/06C08F2/00
CPCC08F114/06C08F2/00
Inventor 陆瑞男王云村赖亲民陈玉振黄雅琴陈骏腾颜旭志洪万墩郑明煌
Owner FORMOSA PLASTICS CORP
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