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Method for removing residual monomers from styrene-acrylic emulsion

A residual monomer, styrene-acrylic emulsion technology, applied in the field of emulsion polymerization, can solve the problems of short free radical life, difficult to remove monomers, low residual monomer concentration, etc., to achieve high removal efficiency and improve removal efficiency.

Inactive Publication Date: 2018-04-20
海安常州大学高新技术研发中心
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Free radicals in the redox system have a short lifespan and low concentration of residual monomers, making it difficult to effectively collide; hot air / nitrogen purging is difficult to remove monomers dissolved in the water phase; ozone or γ-ray irradiation can easily disperse the formed polymers. The chain is cut; it is difficult to remove the monomer whose vapor pressure is close to that of water by decompression and vacuuming

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Put 700kg of deionized water, 6kg of sodium lauryl sulfate, 700kg of styrene, 700kg of butyl acrylate, and 25kg of methacrylic acid into a high-speed disperser at a speed of 1500 rpm, and disperse the materials for 20 minutes to form a pre-emulsion.

[0022] at 5m 3 Add 700kg of deionized water, 2kg of sodium bicarbonate, 4kg of sodium lauryl sulfate, 35kg of styrene, 35kg of butyl acrylate, and 3kg of methacrylic acid into the reaction kettle, open the steam valve, and use the steam in the jacket of the kettle to heat the reaction materials To 75-85°C, add 20kg of ammonium persulfate aqueous solution with a mass fraction of 3%, and after the blue light appears in the system, add the above-mentioned pre-emulsion and 60kg of ammonium persulfate aqueous solution with a mass fraction of 3% simultaneously, and control the dropping rate so that the above After the material was added dropwise within 4 hours, 10kg of ammonium persulfate aqueous solution with a mass fraction of...

Embodiment 2

[0026] Put 700kg of deionized water, 6kg of sodium lauryl sulfate, 700kg of styrene, 700kg of butyl acrylate, and 25kg of methacrylic acid into a high-speed disperser at a speed of 1500 rpm, and disperse the materials for 20 minutes to form a pre-emulsion.

[0027] at 5m 3 Add 700kg of deionized water, 2kg of sodium bicarbonate, 4kg of sodium lauryl sulfate, 35kg of styrene, 35kg of butyl acrylate, and 3kg of methacrylic acid into the reaction kettle, open the steam valve, and use the steam in the jacket of the kettle to heat the reaction materials To 75-85°C, add 20kg of ammonium persulfate aqueous solution with a mass fraction of 3%, and after the blue light appears in the system, add the above-mentioned pre-emulsion and 60kg of ammonium persulfate aqueous solution with a mass fraction of 3% simultaneously, and control the dropping rate so that the above After the material was added dropwise within 4 hours, 10 kg of ammonium persulfate aqueous solution with a mass fraction o...

Embodiment 3

[0031] Put 700kg of deionized water, 6kg of sodium lauryl sulfate, 700kg of styrene, 700kg of butyl acrylate, and 25kg of methacrylic acid into a high-speed disperser at a speed of 1500 rpm, and disperse the materials for 20 minutes to form a pre-emulsion.

[0032] at 5m 3 Add 700kg of deionized water, 2kg of sodium bicarbonate, 4kg of sodium lauryl sulfate, 35kg of styrene, 35kg of butyl acrylate, and 3kg of methacrylic acid into the reaction kettle, open the steam valve, and use the steam in the jacket of the kettle to heat the reaction materials To 75-85°C, add 20kg of ammonium persulfate aqueous solution with a mass fraction of 3%, and after the blue light appears in the system, add the above-mentioned pre-emulsion and 60kg of ammonium persulfate aqueous solution with a mass fraction of 3% simultaneously, and control the dropping rate so that the above After the material was added dropwise within 4 hours, 10 kg of ammonium persulfate aqueous solution with a mass fraction o...

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Abstract

The invention provides a method for removing residual monomers from styrene-acrylic emulsion and relates to the technical field of emulsion polymerization. The method comprises the following steps: mixing propylene glycol methyl ether acetate and emulsion into a reaction kettle; and inserting a vapor guide pipe and a rod-like ultrasonic generator into the reaction kettle at 85 DEG C, opening a vapor valve, blowing saturated water vapor into the emulsion, staring the ultrasonic generator simultaneously to bubble and oscillate the emulsion, cooling the emulsion in the kettle to 40 DEG C after bubbling, and discharging to obtain the residual monomer-removed styrene-acrylic emulsion, wherein the gas outlet of the vapor guide pipe and the ultrasonic generator need to be completely immersed below the liquid level. Through low-frequency ultrasonic oscillation, the residual monomers and the propylene glycol methyl ether acetate enter an aqueous phase from the internal parts of colloidal particles and are driven by the saturated water vapor to be separated from the aqueous phase, so that the residual monomer content of the emulsion system is reduced. The method has the characteristic of high residual monomer removing efficiency.

Description

technical field [0001] The invention relates to the technical field of emulsion polymerization, in particular to the technology for removing residual monomers in styrene-acrylic emulsions. Background technique [0002] Emulsion polymerization uses water as the dispersion medium, emulsifiers, initiators, and organic monomers with double bonds to form polymer emulsions through free radical polymerization. Although emulsion polymerization does not use organic solvents, the reaction process is mild, and a variety of functional monomers can be freely selected to modify the polymer chain. However, there are differences in the reactivity ratio of different monomers, and the polymerization reaction is not carried out in an ideal state. Taking acrylate emulsion as an example, the reactivity ratios of butyl acrylate and methyl methacrylate are relatively close, and there are fewer residual monomers in the emulsion after polymerization; if the hard monomer is replaced by methyl methac...

Claims

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Application Information

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IPC IPC(8): C08F6/16C08F212/08C08F220/18C08F220/06
CPCC08F6/003C08F212/08C08F220/18C08F220/1804C08L25/14C08L33/08C08F220/06
Inventor 方永勤王瑾梅俊龙许亮
Owner 海安常州大学高新技术研发中心
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