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Method for double aqueous phase polymerization of water soluble polymer or copolymer

A technology of water-soluble polymer and polymerization method, applied in the field of synthesizing water-soluble polymer compounds, can solve the problems of high viscosity of dispersion medium, limited industrial application and high cost, and achieve extremely low viscosity, reduced production cost and low production cost. Effect

Inactive Publication Date: 2006-07-26
ZHEJIANG UNIV
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Problems solved by technology

[0005] Because the viscosity of the polymer aqueous dispersion medium itself is relatively large (with 30% polyethylene glycol 20000 aqueous solution as an example, its viscosity is 0.156Pa s), in addition, in the system with the polymer as the dispersion medium, the viscosity of the polymer dispersion medium The dosage is large, and in order to achieve a better dispersion effect, the dosage is even higher than that of the vinyl water-soluble monomer. Therefore, the cost of the two-phase polymerization dispersion product using the polymer aqueous solution as the dispersion medium is extremely high, which is certain To a certain extent, the industrial application of two-phase polymerization technology in which the polymer is the dispersion medium is limited

Method used

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  • Method for double aqueous phase polymerization of water soluble polymer or copolymer
  • Method for double aqueous phase polymerization of water soluble polymer or copolymer
  • Method for double aqueous phase polymerization of water soluble polymer or copolymer

Examples

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Effect test

example 1

[0041] The reaction was carried out in a 0.5 L jacketed reactor. The reactor has a nitrogen inlet, a thermometer socket, a stirrer socket, a sampling port and a condenser socket. Add 60-190 grams of water and 2-100 grams of ammonium sulfate into the reactor as a dispersion medium, then add 0.2-50 grams of acrylamide monomer into the system, raise the temperature of the system while stirring, and further increase the temperature to 30 ~75°C, add 0.00003~0.3 g of ammonium persulfate initiator to the system, and the polymerization reaction starts. As the polymerization reaction progresses, the system gradually changes from a clear aqueous solution to a milky white dispersion. At this time, the system undergoes polymerization and phase separation at the same time. Under a certain stirring intensity, the polyacrylamide formed in the system is separated from the continuous phase. , forming gravel and spherical droplets, which are evenly dispersed in the continuous phase. Since the ...

example 2

[0048] 60-190 grams of water, 2-100 grams of ammonium sulfate, and 0.5-50 grams of acrylamide are used to initiate polymerization using a redox compound initiation system composed of ammonium persulfate and triethanolamine, and the polymerization temperature is 30-65°C. Along with the progress of the polymerization reaction, the system can separate phases smoothly, and after 1-8 hours of reaction, the polymerization reaction is ended, and the conversion rate of the final product of the polymerization is measured by the bromination method, and the final conversion rate is close to 100%. The viscosity of the final product aqueous dispersion is 0.01-0.55 Pa·s.

[0049] With the same solubility experiment of Example 1, it was completely dissolved within 10 seconds under continuous stirring.

example 3

[0051] 60~190 grams of water, 2~100 grams of potassium phosphate, 0.5~50 grams of acrylamide, initiator consumption and polymerization temperature are identical with example 1. With the progress of the polymerization reaction, the system can be phase-separated smoothly. After reacting for 1 to 8 hours, the polymerization reaction is terminated, and the conversion rate of the final product of the polymerization is measured by a bromination method, and the final conversion rate is close to 100%. The viscosity of the final product aqueous dispersion is 0.01-0.50 Pa·s.

[0052] With the same solubility experiment of Example 1, it was completely dissolved within 10 seconds under continuous stirring.

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Abstract

Disclosed is double-water phase method for polymerizing watersoluble polymer or copolymer, using watersoluble salt which can generate double-water phase watersoluble salt with watersoluble polymer as dispersion medium, soluting watersoluble ethylene monomer into the watersoluble salt solution, by watersoluble free radical as initiator making polymerization; the system has phase separation through the intereaction between polymer and dispersion medium, which accumulates separately in its phase forming the polymerizing reaction of repelling watersoluble polymer dispertant. The content of dispersion medium is controlled between 1-50%, and the ratio of polymer and dispersion medium is changing between 1:10-10:1. The dispertant made by the method has outstanding liquidity .

Description

technical field [0001] The present invention relates to a method for synthesizing a water-soluble polymer compound, more specifically, a two-phase aqueous polymerization method for a water-soluble polymer or copolymer. Background technique [0002] Water-soluble polymers can be prepared by free radical aqueous solution, inverse suspension, inverse emulsion, precipitation and solid-state polymerization. Such polymers are widely used in water treatment, papermaking, petroleum, coal, mining, geology and construction industries . The common requirements for products are controllable molecular weight, good water solubility and less residual monomer, so that the quality of the product is uniform, stable and easy to use. [0003] The aqueous solution polymerization process is simple to operate, high polymer yield, and less environmental pollution. It is a common method for preparing water-soluble polymers. It can control the polymerization process and product properties through th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F20/56C08F2/16C08F4/40
Inventor 单国荣曹志海赵亮黄志明翁志学
Owner ZHEJIANG UNIV
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