Method of producing hydrophilic polymer

A technology for the polymerization of hydrophilic polymers and monomers, used in the manufacture of hydrophilic polymers and the manufacture of vinyl-based hydrophilic polymers

Inactive Publication Date: 2007-03-21
TOAGOSEI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the monomer polymerizes to high viscosity on the sliding surface, and accidents such as weir and belt consolidation cannot be avoided

Method used

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  • Method of producing hydrophilic polymer
  • Method of producing hydrophilic polymer
  • Method of producing hydrophilic polymer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0097] (manufacture of polymer coagulant)

[0098] The polymerization of the water-soluble vinyl monomer was carried out using the apparatus shown in FIG. 2 . In addition, the angle α of the bending portion 100 on the continuous belt is 160 degrees, and the angle θ with the horizontal plane is 2.5 degrees. Similarly, the bending angle of the bending portion 14 of the airtight chamber is 160 degrees. The downstream length is 3m and the inclination angle of this part is 2.5 degrees. The continuous belt 2 is a belt obtained by compounding a polyester resin woven belt surface with a fluororesin.

[0099] Distilled water was added to a monomer mixture of 90 mol% of acrylamide and 10 mol% of adducted methyl chloride of dimethylaminoethyl acrylate (hereinafter referred to as "DAC") to obtain a monomer with a monomer concentration of 32% by mass. Aqueous solution 850g. After adjusting the pH to 4.0, nitrogen gas was blown for 30 minutes while maintaining the temperature at 10°C. T...

Embodiment 2

[0109] (Manufacture of water-absorbent resin)

[0110] The polymerization of the water-soluble vinyl monomer was carried out using the apparatus shown in FIG. 2 . In addition, the angle α of the bending portion 100 of the continuous belt is 160 degrees, and the angle θ with the horizontal plane is 2.5 degrees. Similarly, the bending angle of the bending portion 14 of the airtight chamber is 160 degrees. From the bending portion 14 to the most downstream of the airtight chamber The length is 3m, and the inclination angle of this part is 2.5 degrees. The continuous belt 2 is obtained by coating and impregnating a silicone resin on the surface of a belt woven with polyester resin.

[0111] In the mixture of 25 mol% of acrylic acid and 75 mol% of sodium acrylate, trimethylolpropane triacrylate 300ppm (to the total mass of monomers) as a crosslinking agent was added, distilled water was added to make the total mass 850 g and a monomer concentration of 40% by mass to obtain a mono...

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Abstract

In a method of producing a hydrophilic polymer by continuously feeding an aqueous solution 26 of vinyl type monomer onto the upper surface of a movable belt 2 and polymerizing the monomer, the continuous belt 2 is formed with a downwardly projecting flexure portion 100, which is the deepest in the vicinity of polymerizing section for the vinyl type monomer, along the direction of travel of the continuous belt, and the polymerization of the vinyl type monomer is started in the flexure portion. Further, the water vapor volatilizing from the surface of the aqueous solution of vinyl type monomer for which polymerization has been started is expelled.

Description

technical field [0001] The present invention relates to a method for producing a vinyl-based hydrophilic polymer suitable for applications such as polymer coagulants, water-absorbing resins, and various dispersants, and particularly suitable for polymer coagulants. More specifically, it relates to a method for producing a hydrophilic polymer that can increase the liquid depth of an aqueous solution of the vinyl monomer to 50 mm or more during polymerization of the vinyl monomer and is therefore suitable for mass production of the hydrophilic polymer. Background technique [0002] Vinyl-based hydrophilic polymers prepared by polymerizing vinyl-based water-soluble monomers such as acrylamide, acrylic acid, tertiary salts or quaternary salts of dimethylaminoethyl methacrylate, are mostly used in various Wastewater treatment, papermaking additives and water-absorbent resins, etc. [0003] As methods for producing these hydrophilic polymers, there are batch methods and continuou...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F2/01C08F2/10
CPCC08F2/10
Inventor 后藤寿一出口浩司
Owner TOAGOSEI CO LTD
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