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Dispersion stabilizer for suspension polymerization of vinyl compounds and preparation method thereof

A vinyl compound and dispersion stabilizer technology, applied in the field of dispersion stabilizer for vinyl compound suspension polymerization and its preparation, can solve the problems of product color difference, complex production process, difficult operation, etc.

Active Publication Date: 2010-12-29
CHINA PETROCHEMICAL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the dispersion stabilizer of this patent also has problems such as complex production process, difficult operation, poor hue of the product, and failure to meet the requirements of 2 and 3.

Method used

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  • Dispersion stabilizer for suspension polymerization of vinyl compounds and preparation method thereof
  • Dispersion stabilizer for suspension polymerization of vinyl compounds and preparation method thereof
  • Dispersion stabilizer for suspension polymerization of vinyl compounds and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] A dispersion stabilizer for suspension polymerization of vinyl compounds. The preparation process is as follows:

[0063] Add 100 parts of VAc, 1.0 part of acetaldehyde, 80 parts of methanol and 0.1wt% of azobisisobutyronitrile (AIBN) based on the amount of VAc to the polymerization reactor, and then pass nitrogen and heat to 60 ℃, keep the temperature constant, and terminate the polymerization for 5 hours; then use methanol to blow out the unreacted monomer to obtain a methanol solution of polyvinyl acetate (PVAc). Take half of the PVAc methanol solution obtained, prepare a methanol solution with a concentration of 20 wt%, and perform a conventional alcoholysis reaction at 40° C. for 30 minutes to prepare a polyvinyl alcohol with a carbonyl group at the molecular chain end used as a raw material. The monomer conversion rate is 55.1%, the average degree of polymerization of the product is 870, and the degree of alcoholysis is 71.5 mol%.

[0064] Add 10g for every 1kg, add m...

Embodiment 2-15

[0067] Using the relevant parameters described in the following table 1-4 combined with some conventional production processes, according to the preparation method described in Example 1, the molecular chain end of the carbonyl group-containing polyvinyl alcohol used as a raw material is prepared, and the dispersion stabilizer of the present invention Products, as well as polyvinyl chloride granular products.

[0068]

[0069] Among them, each substance is calculated in parts by weight.

[0070] Table 2 corresponds to the PVA product prepared in the above table, combined with the various parameters described in the following table, according to the preparation method in Example 1 to prepare the dispersion stabilizer product of the present invention:

[0071]

[0072] Among them, the amount of the material used in the catalyst and the plasticizer is calculated in parts by weight of the total product PVA.

[0073] Table 3 corresponds to using the dispersion stabilizer product prepare...

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Abstract

The invention relates to a dispersion stabilizer for the suspension polymerization of vinyl compounds. The dispersion stabilizer contains polyvinyl alcohol of which molecular chain ends contain carbonyl groups, and has the average degree of polymerization of at least 600, the alcoholysis degree of 60 to 80 mol percent, the block characteristic coefficient of 0.2 to 0.8, and the ratio of weight-average molecular weight to number-average molecular weight of not higher than 3.0; and the absorbance of the 0.1 weight percent aqueous solution of the dispersion stabilizer at 280 nm is at least 0.3. The dispersion stabilizer of the invention has the characteristics of fewer coarse particles, narrow polymer particle size distribution, fewer aqueous solution foams, high foam inhibition performance and high stability, meets performance indexes required by the dispersion stabilizer for the suspension polymerization, and can be used as a main dispersant for the suspension polymerization.

Description

[0001] technical field [0002] The invention relates to suspension polymerization of vinyl compounds, in particular to a dispersion stabilizer for suspension polymerization of vinyl compounds and a preparation method thereof. Background technique [0003] In industrial production, vinyl compounds such as polyvinyl chloride resin are mainly prepared by suspension polymerization. Suspension polymerization represented by polyvinyl chloride is to disperse monomers such as vinyl chloride into a medium containing water in the presence of a dispersant, and then add an oil-soluble polymerization initiator to it, and then polymerize at elevated temperature to obtain granular ethylene Department of polymers. In the production process, as factors affecting the quality of vinyl polymers, there are polymerization rate, polymerization temperature, ratio of monomer to water, type and quantity of dispersant, type and speed of agitator, type and quantity of initiator, etc. Among them, in ...

Claims

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Application Information

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IPC IPC(8): C08F2/20C08L29/04B29C47/92B29C48/92
Inventor 吴永忠廖永康唐云庆黎园胡腊梅郭海奇朱代才
Owner CHINA PETROCHEMICAL CORP
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