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Method for preparing water-soluble polymer by auto-deposition polymerization initiated by ultraviolet light

A water-soluble polymer and self-deposition technology, applied in the field of precipitation polymerization, can solve the problems of high toxicity of organic solvents, increased production process, high storage and transportation costs, and achieve the effects of simple method, easy drying and high reaction efficiency

Inactive Publication Date: 2012-09-05
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these polymerization methods have certain problems: the products obtained by aqueous solution polymerization are generally suitable for direct use, and the storage and transportation costs are relatively high; post-processing operations such as dehydration of the polymerization products increase the production process, which takes a long time and consumes high energy consumption. cost increase
[0005] In the existing literature reports, most of the solvents used in the precipitation polymerization of acrylic and / or acrylamide water-soluble monomers are dichloromethane, benzene, toluene or supercritical CO 2 Fluid, the organic solvent used is more toxic, and the use of supercritical CO 2 Although the fluid is environmentally friendly, it requires special equipment, which limits the industrial application of precipitation polymerization to prepare acrylic and / or acrylamide polymers

Method used

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  • Method for preparing water-soluble polymer by auto-deposition polymerization initiated by ultraviolet light
  • Method for preparing water-soluble polymer by auto-deposition polymerization initiated by ultraviolet light
  • Method for preparing water-soluble polymer by auto-deposition polymerization initiated by ultraviolet light

Examples

Experimental program
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Effect test

Embodiment 1

[0037] The photoinitiator Irgacure 2959 (10mmol / L), monomer acrylic acid (AA, 2.0mol / L), and acetone (20ml) were mixed in a self-made straight tube hard glass reaction flask to prepare a reaction solution (liquid layer thickness L=0.8 cm), seal the mouth of the bottle with a biaxially oriented polypropylene (BOPP) film, and pour high-purity nitrogen into the bottle for 20 minutes to remove oxygen in the solution; then place the reaction solution under a 250W straight tube medium pressure mercury lamp to irradiate (light Strong is 13W / m 2 ) 120min. The solvent is poured, the polymer is separated and dried. The measured monomer conversion rate is 99.6%, the polymer molecular weight is 2.82 million, and 0.5 g polymer sample can be dissolved in 10 ml deionized water within 10 minutes.

Embodiment 2

[0039] As in Example 1, the reaction solution was irradiated for 60 minutes, the monomer conversion rate was determined to be 92.8%, the polymer molecular weight was 2.65 million, and 0.5 g of the polymer sample could be dissolved in 10 ml of deionized water within 10 minutes.

Embodiment 3

[0041] The photoinitiator DMPA (0.1mmol / L), monomer acrylic acid (AA, 2.0mol / L), and acetone (20ml) were mixed in a self-made straight tube hard glass reaction flask to form a reaction solution (liquid layer thickness L=0.8 cm), seal the mouth of the bottle with a biaxially oriented polypropylene (BOPP) film, and pour high-purity nitrogen into the bottle for 20 minutes to remove oxygen in the solution; then place the reaction solution under an 8W straight tube low-pressure mercury lamp to illuminate (light intensity 16W / m 2 ) 120min. The solvent is poured, the polymer is separated and dried. The measured monomer conversion rate was 91.7%, the polymer molecular weight was 3.4 million, and a 0.5g polymer sample could be dissolved in 10ml deionized water within 10min.

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Abstract

The invention discloses a method for preparing a water-soluble polymer by auto-deposition polymerization initiated by ultraviolet light, belonging to the technical field of aqueous dispersion polymerization. The method comprises the following steps of: firstly, preparing reaction liquid: proportionally mixing a photoinitiator, a water-soluble monomer and a solvent in a straight tube glass reaction flask to prepare the reaction liquid, and introducing nitrogen for removing oxygen for 20-40 minutes, wherein the concentration of the photoinitiator in the reaction liquid is 0.1-10mmol / L, and the concentration of the monomer in the reaction liquid is 0.5-6mmol / L; and then, carrying out illumination reaction: putting the reaction flask containing the reaction liquid below an ultraviolet lamp for irradiating for 10-120 minutes. According to the invention, polymers formed in the reaction process are continuously precipitated out, gathered and deposited at the bottom of the reactor, so that the light shielding effect is relieved or eliminated; and meanwhile, the supernatant liquid can be recycled, so that the reaction efficiency is high, and the method is economic and rapid. Through simple decantation, a product can be separated, the method is simple and convenient, and the product is pure and can be dried easily, thereby being favorable for subsequent applications.

Description

Technical field [0001] The invention relates to a simple and efficient method for preparing water-soluble polymers, in particular to a method for preparing water-soluble polymers by ultraviolet light-initiated self-deposition polymerization, and belongs to the technical field of precipitation polymerization. Background technique [0002] Water-soluble polymers are widely used in papermaking, textile, construction, mining, environmental protection and petroleum exploration industries as thickeners, stabilizers, flocculants, coatings, adhesives, etc. due to their excellent properties (Yan Ruixuan. Water-soluble Polymer [M]. Beijing: Chemical Industry Press, 1998). Among them, acrylic and acrylamide polymers are the focus of market technology development and consumption of water-soluble polymers. In addition to the above-mentioned wide-ranging uses, they can also be used as biological adhesives, biological separation membranes and drug slow-release carriers. [0003] Acrylic and acry...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F20/06C08F20/56C08F2/48C08F2/10C08F2/06C08F120/06C08F120/56C08F220/56C08F220/06
Inventor 杨万泰刘莲英
Owner BEIJING UNIV OF CHEM TECH
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