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Process for producing water-soluble polymer

A water-soluble polymer and polymer technology, applied in the field of water-soluble polymers, can solve problems such as differences in the degree of polymerization of water-soluble polymers, and achieve the effect of promoting evaporation

Inactive Publication Date: 2005-06-15
TOAGOSEI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, there is a problem that the degree of polymerization of the finally obtained water-soluble polymer is significantly different.

Method used

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  • Process for producing water-soluble polymer
  • Process for producing water-soluble polymer
  • Process for producing water-soluble polymer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0092] The polymerization of the water-soluble vinyl monomer was carried out using the apparatus shown in FIG. 1 . Furthermore, the total length of the airtight chamber is 3m.

[0093] Add distilled water to a monomer mixture of 90 mol % of acrylamide and 10 mol % of a quaternary salt (hereinafter referred to as "DAC") prepared by reacting dimethylaminoethyl acrylate and methyl chloride, so that the total mass is 850 kg. The concentration was 32% by mass. After adjusting the pH to 4.0, nitrogen gas was blown for 30 minutes while maintaining the temperature at 10°C to prepare an aqueous monomer solution. This aqueous solution is added to the aqueous solution tank 10.

[0094] In addition, an aqueous solution containing 30 ppm of 1-benzoyl-1-hydroxycyclohexane and 1800 ppm of azobismimidylpropane hydrochloride as a photopolymerization initiator was prepared based on the mass of monomers in the aqueous monomer solution. Nitrogen gas was blown over the aqueous solution for 2 mi...

Embodiment 2

[0105] In addition to changing the device used in Example 1 to image 3 Except for the apparatus shown, it carried out similarly to Example 1, and obtained the powdery polymer. In addition, in this case, 20% of water vapor was removed based on the water in the aqueous monomer solution.

[0106] The physical properties of the obtained polymer were measured in the same manner as in Example 1, and the results are shown in Table 2.

[0107] Sampling position

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Abstract

The present invention discloses a method for producing a water-soluble polymer, wherein the above-mentioned vinyl-based monomer solution is irradiated with light from above the vinyl-based monomer aqueous solution containing a photopolymerization initiator, so that the above-mentioned vinyl-based monomer starts While polymerizing, the water vapor evaporated from the surface of the above-mentioned vinyl-based monomer aqueous solution at the start of polymerization is removed from the surface of the vinyl-based monomer aqueous solution. The water vapor is preferably removed together with an inert gas flowing along the surface of the polymer aqueous solution, or by condensing the water vapor on the surface of a light-transmitting plate placed obliquely above the polymer, or the like.

Description

technical field [0001] The present invention relates to a method for producing a vinyl-based water-soluble polymer suitable for applications such as polymer flocculants. More specifically, it relates to a method of mass-producing a water-soluble polymer having a narrow molecular weight distribution by irradiating an aqueous solution of a vinyl-based monomer with light. Background technique [0002] Vinyl-based water-soluble polymers prepared by polymerizing vinyl monomers such as acrylamide, acrylic acid, dimethylaminoethyl methacrylate tertiary salt or quaternary salt are mostly used in various wastewater treatment and papermaking The use of additives, etc. [0003] As a method for producing a vinyl-based water-soluble polymer, there is a method of irradiating an aqueous solution of the above-mentioned monomers or the like with light to polymerize the monomers. This method must produce a polymer having a high degree of polymerization and a small difference between the deg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F2/48C08F2/16C08F2/46
CPCC08F2/46
Inventor 后藤寿一伊藤贤司都筑哲也美保享
Owner TOAGOSEI CO LTD