Large-sized vinyl chloride seed, method of preparing the seed, vinyl chloride resin prepared using the seed, and method of preparing the vinyl chloride resin

a vinyl chloride resin and large-sized technology, which is applied in the field of large-sized vinyl chloride seeds, can solve the problems of increased production of abnormal polymer agglomerates (called “scales”), productivity loss, and difficulty in enlarge the particle size of vinyl chloride resin to a level above a predetermined value, and achieve good polymerization stability

Inactive Publication Date: 2009-12-17
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0010]The present invention provides a method of preparing a large-sized vinyl chloride seed exhibiting good polymerization stability suitable for seed emulsion polymerization for the production of a vinyl chloride resin, through adjustment of the operation time of a homogenizer.

Problems solved by technology

However, in case of using a large-sized seed with a particle size of 0.54 μm, it may be difficult to enlarge the particle size of a vinyl chloride resin to a level above a predetermined value.
Further, the use of a large-sized seed with a larger average particle size may lead to increased production of abnormal polymer agglomerates (called “scales”) which are not normal polymers.
The scales should be filtered out since they cannot be used as normal products, and more scales may lead to productivity loss and lowered product quality.
However, when a large-sized seed with an increased particle size prepared through the use of a decreased amount of an emulsifier is subjected to seed emulsion polymerization, more scales may be undesirably produced.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

(1-1) Preparation of a Large-Sized Vinyl Chloride Seed Latex through Micro-Suspension Polymerization

[0049]97 kg of deionized water, 89 g of KH2PO4, 11 g of NaOH (98%), 1.2 kg of lauryl peroxide, and 0.9 g of paraquinone were introduced to a 200 l high-pressure reactor while stirring at a speed of 40 rpm using an agitator, and vacuum of −730 mmHg was applied thereto to keep the reactor at a vacuum state. Then, 66 kg of a vinyl chloride monomer and 7.8 kg of sodium dodecylbenzene sulfonate (15%) were introduced into the reactor, and the reactor was stirred for 15 minutes. An internal temperature of the reactor was reduced to less than 20° C., and the introduced components were homogenized using a rotor-stator type homogenizer for two hours. After the homogenization was completed, the reactor was heated to 43° C. to initiate polymerization. When the pressure of the reactor reached 3.5 kg / cm2, the polymerization reaction was terminated and an unreacted residual monomer was recovered and...

example 2

[0059]60 kg of deionized water, 80 kg of a vinyl chloride monomer, and 0.46 kg of sodium dodecylbenzene sulfonate were introduced into a 200 l high-pressure reactor. The reactor was heated to 50.5° C., and seed emulsion polymerization was performed for seven hours to obtain a vinyl chloride resin latex. At this time, a large-sized vinyl chloride seed latex (an average particle size: 0.77 μm, the content of a polymerization initiator: 1.77%) and a small-sized vinyl chloride seed latex (an average particle size: 0.1 μm) were used, and the weight ratio of the large-sized seed latex to the small-sized seed latex was 1.09.

example 3

[0060]A vinyl chloride resin latex was prepared in the same manner as in Example 2 except that the weight ratio of the large-sized seed latex to the small-sized seed latex was 0.84.

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Abstract

The present invention relates to a large-sized vinyl chloride seed with an average particle size of 0.65 to 1.5 μm, a vinyl chloride resin with improved low-viscosity properties, and preparation methods thereof. The preparation of the large-sized vinyl chloride seed includes adding a vinyl chloride monomer, an emulsifier, and a polymerization initiator to an aqueous medium; homogenizing the mixed solution using a rotor-stator type homogenizer; and subjecting the resultant monomer droplets to a polymerization reaction.

Description

CROSS-REFERENCE TO RELATED PATENT APPLICATION[0001]This application claims the benefit of Korean Patent Application Nos. 10-2008-0055486, filed on Jun. 13, 2008 and 10-2008-0101315, filed on Oct. 15, 2008 in the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to a large-sized vinyl chloride seed, a method of preparing the seed, and a vinyl chloride resin prepared using the seed. The vinyl chloride resin exhibits improved high-shear and low-shear viscosity properties through adjustment of the weight ratio of the large-sized vinyl chloride seed and a small-sized vinyl chloride seed with an average particle size of 0.08 to 0.2 μm.[0004]2. Description of the Related Art[0005]A paste vinyl chloride resin is a general-purpose resin that is widely used worldwide for domestic and industry applications, and is generally prepared by emulsion polymeriza...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B32B27/30C08F14/06C08F4/34C08F4/04
CPCC08F2/22C08F114/06Y10T428/2982C08K5/42C08F2/24
Inventor YOUK, KYUNG SEOGSHIN, HYUN JINKIM, HAN HONG
Owner LG CHEM LTD
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