Method of initiating acrylamide polymerization by composite initiation system

A technology of composite initiation and initiation system, applied in the field of acrylamide polymerization, can solve the problems of increasing relative molecular mass, reducing the number of collisions between monomers and active chains, etc., achieving the effects of convenient reaction operation and improving relative molecular mass

Inactive Publication Date: 2007-08-15
SICHUAN GUANGYA POLYMER CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although reducing the reaction concentration of the system can reduce the heat of polymerization in the system, it is beneficial to increase the relative molecular mass of the polymer, but on the other hand, due to the reduction of the concentration, the number of collisions between the monomer and the active chain is correspondingly reduced, which is not conducive to the relative molecular weight of the polymer. increase in molecular mass

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0007] Example 1: Weigh 250 grams of acrylamide monomer into a beaker filled with 750 grams of water, stir it thoroughly, put it in a refrigerator and let the solution cool down to 0°C. Then, pour the cooled solution into a thermos cup to reduce heat exchange between the system and the outside world. Add 1 ml of 1% manganese sulfate solution, 2 ml of 1% sodium bisulfite, 0.5 ml of 1% ammonium persulfate, and 1 ml of 1% azobisisobutyronitrile. After the addition of the initiator, the thermos cup was covered, and the polymerization was completed after 6 hours of adiabatic reaction. The obtained glue-like substance was taken out, purified with absolute ethanol, and dried in a vacuum desiccator at 60° C. until constant weight. The obtained product has a molecular weight Mw of 26.32 million, no insoluble matter, and an unreacted monomer content of less than 0.1%.

Embodiment 2

[0008] Example 2: Weigh 200 grams of acrylamide monomer into a beaker filled with 800 grams of water, stir it well, put it in a refrigerator and let the solution cool down to 0°C. Then, pour the cooled solution into a thermos cup to reduce heat exchange between the system and the outside world. Add 1 ml of 1% zinc chloride solution, 2 ml of 1% sodium bisulfite, 0.5 ml of 1% ammonium persulfate, 1% of N,N'-dihydroxyethyl azobisisobutyrosulfite salt 1 ml. After the addition of the initiator, the thermos cup was covered, and the polymerization was completed after 5 hours of adiabatic reaction. The obtained glue-like substance was taken out, purified with absolute ethanol, and dried in a vacuum desiccator at 55° C. until constant weight. The obtained product has a molecular weight Mw of 20.61 million, has no insoluble matter, and has an unreacted monomer content of less than 0.1%.

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PUM

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Abstract

The invention discloses a triggering method of acrylamide through two-segment composite low-temperature and high-temperature system, which comprises the following steps: adding acrylamide monomer into water with density at 20-40% without removing oxygen; cooling to 0 deg.c; adding oxidant-reducer-catalyst and azo-compound into composite system; sealing the reactor; insulating to react for 4-6h to finish polymerizing; fetching gel-shaped material; purifying through anhydrous alcohol; drying in the vacuum under 50-60 deg.c to constant weight; obtaining the product with molecule at 20000000-28000000; simplifying the reaction without removing oxygen.

Description

technical field [0001] The invention relates to a method for initiating acrylamide polymerization using a composite initiation system of two stages of low temperature and medium high temperature, belonging to a new method for acrylamide polymerization. Background technique [0002] The polymerization of acrylamide is usually based on aqueous solution polymerization. Under the protection of nitrogen, the aqueous solution of acrylamide monomer is added with an oxidation-reduction initiation system, and the polymerization reaction is carried out at around 40°C. The polymerization of acrylamide is an exothermic reaction, the polymerization rate increases significantly with the increase of temperature, while the degree of polymerization decreases with the increase of temperature. Therefore, in order to obtain polyacrylamide products with high relative molecular weight, it is necessary to control the temperature of the system. For large-scale industrial production, the heat excha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F120/56C08F4/04C08F4/40
Inventor 陈洪罗平亚韩利娟叶仲斌李晓南
Owner SICHUAN GUANGYA POLYMER CHEM
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