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Method for preparing vinyl chloride pasty resin

A technology of paste resin and vinyl chloride, which is applied in the field of microsuspension polymerization, can solve the problems of lower latex stability, lower drying efficiency, and increased burden of post-processing steps, and achieve the effect of improving yield and increasing output

Inactive Publication Date: 2002-01-16
KANEKA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the case of adding water or an aqueous solution of a surfactant, the burden on the post-treatment step is increased, so the drying efficiency is reduced
In the case of adding only monomer, the stability of the latex is reduced

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 110 kg of vinyl chloride, 110 kg of ionized water, 0.77 kg of sodium dodecylbenzenesulfonate and 1.1 kg of cetyl alcohol were added to a 300-liter pressure vessel and homogenized with a pressure homogenizer. The resulting aqueous dispersion was transferred to a 300-liter polymerization reactor containing 100 g of 2,2'-azobis(2,4-dimethylvaleronitrile), and the temperature was raised to 45°C to initiate polymerization.

[0033] Separately, 35 kg of a 1% by weight aqueous solution of sodium dodecylbenzenesulfonate was added to an 80-liter pressure vessel. After degassing, 40 kg of vinyl chloride was added to the container and dispersed with a homogenizer for 30 minutes to obtain a second dispersion for additional feeding.

[0034] After 3 hours, since the internal temperature of the reactor reached 45° C., continuous addition of the second dispersion at a rate of 6.0 kg / hour (3.2 kg monomer per hour) to the reactor was started. When 8 hours had elapsed, the continuous ad...

Embodiment 2

[0039] The procedure of Example 1 was repeated, except that when 2 hours passed, since the internal temperature of the reactor reached 45° C., the second dispersion was continuously added at a rate of 5.1 kg / hour (2.7 kg monomer per hour) . The total amount of the second dispersion added was 30.6 kg, of which the monomer portion was 16.3 kg. The polymerization conversion of the initially charged monomer was 15% at the time the addition of the second dispersion was started and 87% at the time the addition was terminated. With regard to the latex obtained finally, the conversion rate of all monomers was 93%. The results are listed in Table 1.

Embodiment 3

[0041] The procedure of Example 1 was repeated, except that when 1 hour passed, since the internal temperature of the reactor reached 45° C., the second dispersion was started to be continuously added at a rate of 5.1 kg / hour (2.7 kg monomer per hour) . The total amount of the second dispersion added was 35.7 kg, of which the monomer portion was 19.0 kg. The polymerization conversion of the initially charged monomer was 8% at the time the addition of the second dispersion was started and 89% at the time the addition was terminated. With regard to the latex obtained finally, the conversion rate of all monomers was 94%. The results are listed in Table 1.

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PUM

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Abstract

A process for preparing a vinyl chloride paste resin comprises the following steps: homogenizing a vinyl chloride monomer in an aqueous medium together with an oil-soluble polymerization initiator to form a first aqueous dispersion, and subjecting the first dispersion to a micro-suspension polymerization wherein a second aqueous dispersion containing a vinyl chloride monomer and a surface active agent is added to the reaction system in such a manner that the addition is started after starting the polymerization but by the time the polymerization conversion of the initially charged monomer reaches 30%, and is terminated by the time the polymerization conversion of the initially charged monomer reaches 95%. The process has an improved productivity since the heat removing area of a jacket of a reactor is prevented from lowering during the polymerization to increase the amount of heat removed and since the polymer yield per unit volume of the reactor is increased.

Description

technical field [0001] The invention relates to a method for preparing vinyl chloride paste resin, in particular to a microsuspension polymerization method for preparing vinyl chloride resin suitable for paste technology. Background technique [0002] Microsuspension polymerization involves a homogenization step in which vinyl chloride monomer, water, surfactants, polymerization initiators and other polymerization aids dissolved in the monomer are mixed under high shear in a separate mixing in equipment to form a homogeneous dispersion, and a polymerization step in which the dispersion is transferred to a polymerization apparatus and polymerized under agitation, thereby producing vinyl chloride pasty resin particles having an elementary particle size of about 0.2 to about 3 microns. [0003] As used herein, the term "vinyl chloride monomer" means vinyl chloride itself or a mixture of vinyl chloride and other monomers copolymerizable with vinyl chloride. [0004] In microsus...

Claims

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Application Information

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IPC IPC(8): C08F2/00C08F2/18C08F14/00C08F14/06
CPCC08F14/06C08F2/16
Inventor 中川知昭内田阳一吉田刚
Owner KANEKA CORP
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