Preparation method of reversible agglomeration and re-dispersion latex based on amidine compound

A technology of redispersing glue and amidine compounds, which is applied in the field of reversible coagulation and redispersing latex preparation, can solve the problems of unreported coagulation of polymer particles and difficulties, and achieve the effect of easy control and process reversibility

Active Publication Date: 2011-11-16
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it is not reported whether the aggregated polymer particles can be redispersed to form a stable microsuspension, and the particle size of the polymer particles synthesized by microsuspension polymerization is in the submicron to micron range, which is different from the tens to several tens of microsynthesized by emulsion polymerization. With a latex particle size of hundreds of nanometers, it is still difficult to directly use long-chain alkylamidines for emulsion polymerization

Method used

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  • Preparation method of reversible agglomeration and re-dispersion latex based on amidine compound
  • Preparation method of reversible agglomeration and re-dispersion latex based on amidine compound
  • Preparation method of reversible agglomeration and re-dispersion latex based on amidine compound

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] (1) Add 0.125 parts of amidine-containing compound M-B2 (n=1) as a comonomer and 19 parts of deionized water into a 50ml three-necked bottle, and stir mechanically;

[0049] (2) Add 5 parts of monomeric styrene to the solution in step (1), pass nitrogen to remove oxygen for 15 minutes, and pass carbon dioxide gas;

[0050] (3) Weigh 0.094 parts of azodiisopropylimidazoline hydrochloride (V-50), dissolve it in 1 part of deionized water and add it to the monomer emulsion to initiate polymerization;

[0051] (4) React at 70°C for 8 hours and stop the reaction;

[0052] (5) Adjust the pH of the obtained polymer latex to 9~10 with a small amount of 0.1M sodium hydroxide aqueous solution, so that the latex particles can be coagulated, and the latex particles can be redispersed by carbon dioxide gas and ultrasonic to obtain a stable polymer latex.

[0053] The conversion rate of the final styrene monomer in the polymerization system was 94.3%, and the conversion rate of the c...

Embodiment 2

[0055] (1) Add 0.25 parts of amidine-containing compound S-A5 (n=8, m=0) as a reactive surfactant, 19 parts of deionized water into a 50ml three-necked bottle, and stir mechanically;

[0056] (2) Add 5 parts of monomeric styrene to the solution in step (1), pass nitrogen to remove oxygen for 15 minutes, and pass carbon dioxide gas;

[0057] (3) Weigh 0.094 parts of azodiisopropylimidazoline hydrochloride (V-50), dissolve it in 1 part of deionized water and add it to the monomer emulsion to initiate polymerization;

[0058] (4) React at 65°C for 5 hours and stop the reaction;

[0059] (5) The obtained polymer latex was subjected to nitrogen gas flow at 70°C for 0.5 hours to agglomerate the latex particles, and carbon dioxide gas and ultrasound to redisperse the latex particles to obtain a stable polymer latex.

[0060] The final conversion rate of styrene monomer in the polymerization system was 97.6%. Gel permeation chromatography (GPC) was used to measure the molecular weig...

Embodiment 3

[0062] (1) Add 0.125 parts of amidine-containing compound M-B2 (n=1) as a comonomer, 0.125 parts of dodecylamine hydrochloride as a surfactant, and 19 parts of deionized water in a 50ml three-necked bottle. stir;

[0063] (2) Add 5 parts of monomeric styrene to the solution in step (1), pass nitrogen to remove oxygen for 15 minutes, and pass carbon dioxide gas;

[0064] (3) Weigh 0.047 parts of azodiisopropylimidazoline hydrochloride (V-50), dissolve it in 1 part of deionized water and add it to the monomer emulsion to initiate polymerization;

[0065] (4) React at 70°C for 8 hours and stop the reaction;

[0066] (5) The obtained polymer latex can be coagulated with a small amount of 0.1M sodium hydroxide aqueous solution, and the latex particles can be redispersed by passing carbon dioxide gas and ultrasonic to obtain a stable polymer latex.

[0067] The conversion rate of the final styrene monomer in the polymerization system was 99.9%, and the conversion rate of the comon...

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Abstract

The invention discloses a preparation method of a reversible agglomeration and re-dispersion latex based on an amidine compound. In the preparation method, an amidine-containing compound is used as a copolymerization monomer or a reactive emulsifier, a chain transfer agent, an initiator and other additives to be applied in the emulsion polymerization of radically polymerizable monomers to preparea stable polymer latex, wherein the amidine group is firmly bonded on the surfaces of latex particles by virtue of covalent bonds. The agglomeration of the latex particles of the latex is realized byheating and introducing nitrogen gas or adding a small amount of base solution, and the agglomerated latex particles can be dispersed by introducing carbon dioxide gas to obtain the stable latex. Theagglomeration and re-dispersion process is reversible and easy to control.

Description

technical field [0001] The invention relates to a method for preparing reversible coagulation and redispersion latex, in particular to a method for preparing reversible coagulation by emulsion polymerization using amidine-containing compounds as comonomers or reactive emulsifiers, chain transfer agents, initiators and other auxiliary agents. Method with redispersed polymer latex. Background technique [0002] Synthetic latex is an important part of polymer products. It is widely used in industrial fields such as paper, textiles, coatings, adhesives, and sealants. The annual global latex production is tens of millions of tons. With the development of modern science and technology, latex has gradually been applied in new fields such as biomedicine, advanced materials, and information, with broad prospects. Synthetic latex is a product obtained through the polymerization reaction of monomers dispersed into emulsions in water through the action of surfactants (emulsifiers), in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F212/08C08F2/24C08F2/38C08F4/00C08J3/16C08J3/02
Inventor 王文俊张祺李伯耿朱世平
Owner ZHEJIANG UNIV
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