Chloroethylene suspension polymerization terminator and preparation method and use method thereof

A technology of suspension polymerization and terminator, applied in the field of vinyl chloride suspension polymerization terminator, can solve the problems of low polymerization termination efficiency, difficulty in preparing dispersion solution, toxicity, etc., and achieve excellent termination effect.

Active Publication Date: 2012-08-01
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These terminators have certain disadvantages in the later use of vinyl chloride polymerization: strong volatility, large heating loss, poor water solubility, difficulty in preparing dispersion solutions, diff

Method used

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  • Chloroethylene suspension polymerization terminator and preparation method and use method thereof
  • Chloroethylene suspension polymerization terminator and preparation method and use method thereof
  • Chloroethylene suspension polymerization terminator and preparation method and use method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] Vinyl chloride suspension polymerization terminator components:

[0070]

[0071] Preparation of vinyl chloride suspension polymerization terminator: Dissolve 0.83 parts of polyvinyl alcohol I (PVA80), 0.50 parts of polyvinyl alcohol II (PVA55) and 1.67 parts of hydroxypropyl methylcellulose into 75 parts of deionized water, stir at high speed Form an aqueous dispersant emulsion in 0.25 hours; add 11.1 parts of organotin S, S'-bis(isooctyl thioacetate)-bis(n-octyl)tin to the above aqueous emulsion, and stir for 0.5 hour to form an organotin emulsion; Add aqueous solution of sodium dimethyldithiocarbamate (25 parts of desalted water in this aqueous solution, 2.33 parts of sodium dimethyldithiocarbamate) into the above-mentioned aqueous emulsion, and stir for 0.35 hours to obtain the vinyl chloride suspension polymerization termination solution of the present invention. agent. (The above operations are all carried out under normal temperature and pressure, and the sti...

Embodiment 2

[0084] The polymerization formula is as follows:

[0085]

[0086] Note:

[0087] PVA80: polyvinyl alcohol with an alcoholysis degree of 80%

[0088] PVA55: polyvinyl alcohol with a degree of alcoholysis of 55%

[0089] E50: Hydroxypropylmethylcellulose

[0090] TAPP: pivalate peroxypivalate

[0091] TBPND: tert-butyl peroxyneodecanoate

[0092] NG: 2-Mercaptoethanol

[0093] NaOH: sodium hydroxide

[0094] Vinyl chloride suspension polymerization terminator is the same as embodiment 1

[0095] Operation method:

[0096] Wash the polymerization reactor with deionized water, add deionized water, PVA80, PVA55, E50, NaOH, TAPP, TBPND in the formula amount at room temperature, close the reactor, start stirring, the speed is 450rpm, vacuumize to -0.095MPa, Add VCM, stir for 10 minutes, then raise the temperature to the reaction temperature of 61°C, then add the formulated amount of NG, and complete the addition within 20 minutes. Control the reaction at 57°C. When the pr...

Embodiment 3

[0098] The polymerization formula is as follows:

[0099]

[0100] Note:

[0101] PVA80: polyvinyl alcohol with an alcoholysis degree of 80%

[0102] E50: Hydroxypropylmethylcellulose

[0103] LE: azobisisoheptanonitrile

[0104] NG: 2-Mercaptoethanol

[0105] NaOH: sodium hydroxide

[0106] Vinyl chloride suspension polymerization terminator is the same as embodiment 1

[0107] Operation method:

[0108] Wash the polymerization reactor with deionized water, add deionized water, PVA80, E50, NaOH, LE at normal temperature, close the reactor, start stirring, rotate at 450rpm, vacuumize to -0.095MPa, add VCM,

[0109] Stir for 10 minutes, then raise the temperature to the reaction temperature of 62.2°C, and add NG within 30 minutes. When the reaction pressure is reduced by about 0.21 MPa from the constant pressure state, add the emulsion, keep the reaction conditions unchanged, observe and record the change of the polymerization reaction pressure, release the pressure a...

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Abstract

The invention discloses a chloroethylene suspension polymerization terminator and a preparation method and a use method thereof, belonging to a terminator used in a chloroethylene polymerization process. The chloroethylene suspension polymerization terminator is characterized by being an aqueous emulsion dispersion liquid and consisting of the following raw materials in parts by weight: 100 parts of deionized water, 2-30 parts of organic tin thermal stabilizer, 0.3-4.5 parts of polyvinyl alcohol I, 0-3.1 parts of polyvinyl alcohol II, 0.2-4.5 parts of cellulose ether and 0.1-3.5 parts of chain terminator, wherein the deionized water is industrial secondary desalted water; the alcoholysis degree of the polyvinyl alcohol I is between 75-85 percent; the alcoholysis degree of the polyvinyl alcohol II is between 50-60 percent; and the cellulose ether is methyl cellulose (MC), hydroxyethylmethylcellulose (HEC) or hydroxypropyl methyl cellulose (HPMC). The invention provides a chloroethylene suspension polymerization terminator which can be used for effectively terminating a chloroethylene polymerization reaction and remarkably improving the aging whiteness and heat resistance of polymerized resin, and the preparation method and the use method thereof.

Description

technical field [0001] The invention relates to a vinyl chloride suspension polymerization terminator, a preparation method and a use method thereof. It belongs to the terminator used in the polymerization process of vinyl chloride. Background technique [0002] Polyvinyl chloride is one of the three major synthetic resins in the world. It is a general-purpose resin material with superior performance and low price. It is mainly produced by free radical polymerization of vinyl chloride monomer. The suspension polymerization process is the most important and widely used production method. Vinyl chloride polymer resin is a heat-sensitive material, which is easily degraded by heat and light; at present, the method of adding various stabilizers during processing is mainly used to solve this problem. [0003] During the suspension polymerization of vinyl chloride, when the monomer conversion rate exceeds 80%, the disproportionation between macromolecular free radicals will increa...

Claims

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Application Information

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IPC IPC(8): C08F14/06C08F2/20C08F2/38
Inventor 朱卫东张磊车万里梁斌于永玲李留忠鲍春伟王晶张立红郭卫东张勇袁锦慧
Owner CHINA PETROLEUM & CHEM CORP
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