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Method for synthesizing homopolymer and copolymers in alcohol-water system

A synthesis method and technology of copolymers, applied in the field of polymer synthesis, can solve the problems of difficult large-scale industrial production, complex process and equipment, and achieve the effects of less types and amounts of use, wide applicability and easy control.

Inactive Publication Date: 2007-12-19
DALIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the process and equipment are relatively complex
The corresponding suspension polymerization and emulsion polymerization processes are described in patents EPA0486262, EPA0608567 and DEA4442577. Due to the reasons of the process and equipment, it is difficult to apply to large-scale industrial production

Method used

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  • Method for synthesizing homopolymer and copolymers in alcohol-water system

Examples

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Embodiment 1

[0020] Example 1.a, raw material mixing: 100 kg of mixed monomers with a mass content of 80% vinylidene chloride and 20% vinyl chloride were mixed with 100 kg of water to form a mixed system with a total monomer mass fraction of 50%, adding 2% by mass of sodium lauryl sulfate, 1% of cetyl alcohol, 1% of ammonium persulfate and sodium sulfite are used as an initiator and an appropriate amount of stabilizer and plasticizer, and are rapidly stirred and emulsified in a mixer (2). b. Adding alcohol: the above-mentioned mixed raw materials are sent into the jacketed heating reaction kettle (1) through valve switching, and 5% ethanol by mass based on water is added under rapid stirring in the reaction kettle. c. Polymerization reaction: after purging the inside of the reactor (1) with an inert gas such as nitrogen, react at 50° C. for 2 hours. d. Separation: The reaction product is separated from ethanol and unreacted monomers by the alcohol-water separator (3) to obtain vinylidene c...

Embodiment 2

[0021] Example 2.a, raw material mixing: mix 100 kg of mixed monomers with 90% vinylidene chloride mass content and 10% vinyl chloride mass content with 100 kg water to form a mixed system with a total monomer mass fraction of 50%, and add 2% by mass of sodium lauryl sulfate, 1% of cetyl alcohol, 1% of ammonium persulfate and sodium sulfite are used as an initiator and an appropriate amount of stabilizer and plasticizer, and are rapidly stirred and emulsified in a mixer (2). b. Adding alcohol: the above-mentioned mixed raw materials are sent into the jacketed heating reactor (1) through valve switching, and 20% ethanol by mass based on water is added under rapid stirring in the reactor. c. Polymerization reaction: After purging the inside of the reactor (1) with an inert gas such as nitrogen, react at 80° C. for 2 hours. d. Separation: The reaction product is separated from ethanol and unreacted monomers by the alcohol-water separator (3) to obtain vinylidene chloride and viny...

Embodiment 3

[0022] Example 3.a, raw material mixing: mix 100 kg of mixed monomers with 80% vinylidene chloride mass content and 20% styrene mass content with 233 kg water to form a mixed system with a total monomer mass fraction of 30%, and add 1% by mass of sodium lauryl sulfate, 2% cetyl alcohol, 0.2% ammonium persulfate and sodium sulfite are used as an initiator and an appropriate amount of stabilizer and plasticizer, and are rapidly stirred and emulsified in a mixer (2). b. Alcohol addition: the above-mentioned mixed raw materials are sent into the jacketed heating reactor (1) through valve switching, and 5% methanol by mass based on water is added under rapid stirring in the reactor. c. Polymerization reaction: after purging the inside of the reactor (1) with an inert gas such as nitrogen, react at 50° C. for 3 hours. d. Separation: the reaction product is separated from methanol and unreacted monomers by the alcohol-water separator (3) to obtain vinylidene chloride and styrene copo...

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Abstract

A process for synthesizing the homopolymer and copolymer in alcohol-water system includes such steps as mixing raw materials under existence of emulsifier, coemulsifier, trigger, stabilizer and plasticizer in the mixture of C1-C3 alcohol and water, adding alcohol, polymerizing reaction at 30-80 deg.C and separation. Its advantages are easy control of product nature and reaction procedure, and high safety.

Description

technical field [0001] The invention relates to the field of polymer synthesis, in particular to a method for synthesizing homopolymers and copolymers. Background technique [0002] The synthesis of vinylidene chloride homopolymerization and copolymers mainly adopts suspension polymerization and emulsion polymerization at present. Suspension polymerization is generally used to produce powdery vinylidene chloride homopolymerization and copolymers, and emulsion polymerization is used to produce milky vinylidene chloride homopolymerization and emulsion polymerization. copolymer. In the patent 02141005.4 (application number), a method for synthesizing vinylidene chloride polymer by suspension polymerization is described, which still belongs to the extension of the traditional suspension polymerization method. It describes a class of styrene, butadiene, vinyl chloride, vinyl acetate, vinylidene chloride, alkyl (meth)acrylates, (meth)acrylic acid, (meth)acrylonitrile and (meth) ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F2/16C08F2/00C08F14/22C08F12/08C08F18/08C08F36/06
Inventor 肖进彬
Owner DALIAN UNIV
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