Vinyl chloride polymer and its preparation method

A vinyl chloride polymer and vinyl chloride polymerization technology are applied in the field of vinyl chloride polymer and its preparation, which can solve the problems of fisheye and initial coloring performance deterioration, low polymerization productivity and the like, and achieve fisheye quality and initial coloring performance quality improvement. , The effect of low melt viscosity and excellent processing performance

Active Publication Date: 2022-05-06
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] An aspect of the present invention provides a method for producing a vinyl chloride polymer, which has excellent processability while solving the problems of low polymerization productivity and fish problems due to undissolved particles of reactants when producing vinyl chloride polymers. Problems with degradation of eye and initial coloring performance

Method used

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  • Vinyl chloride polymer and its preparation method
  • Vinyl chloride polymer and its preparation method
  • Vinyl chloride polymer and its preparation method

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preparation example Construction

[0060] A method of preparing a vinyl chloride polymer according to an embodiment of the present invention may include stirring the above-prepared reaction mixture, and suspension polymerization may be performed by stirring.

[0061] In addition, if necessary, the method for preparing vinyl chloride polymer according to one embodiment of the present invention may also include sodium bicarbonate (NaHCO 3 ), sodium borate (Na 2 B 4 o 7 ), disodium hydrogen phosphate (Na 2 HPO 4 ), sodium carbonate (Na 2 CO 3 ), Potassium dihydrogen phosphate (KH 2 PO 4 ), ammonium hydroxide (NH 4 OH), potassium tartrate (KHC 4 h 4 o 6 ), potassium hydrogen phthalate (KHC 8 h 4 o 4 ) and calcium hydroxide (Ca(OH) 2 ) in any one or a mixture of two or more as a hydrogen ion concentration control agent.

[0062] In addition, the method for preparing a vinyl chloride polymer according to one embodiment of the present invention may further include diallyl maleate (DAM), diallyl phthala...

Embodiment 1

[0082] The internal volume is 0.2m 3 90kg of deionized water, 45g of hydroxy-dimethylbutyl peroxide, 60g of hydration degree of 80% and a viscosity of 30cps in a 4% aqueous solution at room temperature were introduced into the reactor (pre-polymerization reactor) Polyvinyl alcohol, 40 g of polyvinyl alcohol with a hydration degree of 40% and a viscosity of 20 cps in a 4% aqueous solution at room temperature. After the vacuum was applied, 75 kg of vinyl chloride monomer was introduced into the reactor, and the polymerization temperature was raised to 62° C. to perform a polymerization reaction. Afterwards, when the polymerization conversion rate reaches 13% (13±2%), all the prepared vinyl chloride polymerization seeds and unreacted monomers are transferred to the main polymerization reactor. At this time, the polymerization conversion was measured by gas chromatography using a butane tracer. Under predetermined polymerization conditions, whenever each polymerization condition...

Embodiment 2

[0086] In addition to raising the polymerization temperature of the pre-polymerization reactor to 67°C for polymerization, and controlling the polymerization temperature of the main polymerization reactor to 56°C for polymerization, then when the pressure of the polymerization reactor reaches 6.3kgf / cm 2 (when the polymerization conversion rate was 84% ​​(84±2%)), except that the polymerization reaction was terminated, a vinyl chloride polymer was obtained in the same manner as in Example 1.

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Abstract

The invention relates to a vinyl chloride polymer and a preparation method thereof. More specifically, the present invention provides a vinyl chloride polymer having a polydispersity index of 2.0 to 2.3 and a porosity of 60% or more, and a method for preparing the vinyl chloride polymer. The preparation method of the vinyl chloride polymer is specifically the following method: first, a vinyl chloride polymerization seed with a conversion rate of 5% to 20% is prepared by prepolymerization, and then vinyl chloride monomers are introduced into the vinyl chloride polymerization seed to polymerize ( main polymerization) vinyl chloride polymer, at this time, the temperature difference between the pre-polymerization and the main polymerization is controlled at 5°C to 15°C. The preparation method has the effect of improving polymerization productivity, and since the vinyl chloride polymer prepared by the preparation method can exhibit desired physical properties, the preparation method also has the effect of improving fish eye quality and initial coloring performance and having The effect of excellent processability.

Description

technical field [0001] Cross References to Related Applications [0002] This application claims Korean Patent Application No.10-2018-0049563 filed with the Korean Intellectual Property Office on April 30, 2018 and Korean Patent Application No.10-2019 filed with the Korean Intellectual Property Office on April 25, 2019 -0048264, the disclosures of both patent applications are hereby incorporated by reference in their entirety. technical field [0003] The present invention relates to a vinyl chloride polymer having excellent processability and improved fisheye and initial coloring properties, and a method for producing a vinyl chloride polymer having improved polymerization productivity. Background technique [0004] Vinyl chloride polymers are inexpensive while having an excellent mass balance, and therefore are used in a wide range of fields such as hard materials and soft materials. Specifically, in the rigid field, vinyl chloride polymers are used for pipes, films, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F14/06C08F114/06C08F2/18
CPCC08F14/06C08F114/06C08F2/001C08F2/18C08L27/06C08F2500/03C08F2500/24
Inventor 安晟镕金健地李世雄朱镇爀河玄圭
Owner LG CHEM LTD
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