Preparation method of water-in-water type cationic polyacrylamide emulsion

A polyacrylamide, cationic technology, applied in the direction of dehydration/drying/concentrating sludge treatment, etc., can solve the problems of product molecular weight decrease, affecting product quality and performance, and poor solubility, avoiding demulsification and improving stability. , the effect of slowing the viscosity increase

Active Publication Date: 2013-04-17
江苏吉邦材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above patents emphasize the use of hydrophobic monomers to avoid high viscosity during polymerization, but this often results in a

Method used

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  • Preparation method of water-in-water type cationic polyacrylamide emulsion
  • Preparation method of water-in-water type cationic polyacrylamide emulsion
  • Preparation method of water-in-water type cationic polyacrylamide emulsion

Examples

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Synthetic example 1

[0028] Synthesis Example 1 is a synthesis method of the dispersant used in the present invention.

[0029] Synthesis Example 1

[0030] In a reactor equipped with a thermometer, a condenser, a nitrogen gas inlet and a stirring rod, add 100 g of monomer A acryloyloxyethyltrimethylammonium chloride and 398 g of water, raise the temperature to 50 ° C, and pass nitrogen gas for 30 minutes. Add 2 g of azobisisobutylamidine hydrochloride aqueous solution with a concentration of 5%, and stop the reaction after 20 hours of reaction to obtain a polyacryloyloxyethyltrimethylammonium chloride dispersant.

[0031] The synthetic method of polymethacryloyloxyethyltrimethylammonium chloride and polydiallyldimethylammonium chloride is the same as Synthesis Example 1, only need to change monomer A into methacryloyloxyethyl Trimethylammonium chloride and diallyldimethylammonium chloride are enough; the method of synthesizing acrylamide copolymer and methacrylamide copolymer is also the same as...

Embodiment 1

[0034] In a reactor equipped with a thermometer, condenser, nitrogen inlet and stirring rod, add 45 parts of ammonium sulfate, 15 parts of acrylamide, 35 parts of diallyl dimethyl ammonium chloride, polyacryloxyethyl trimethyl 5 parts of ammonium chloride, add 100 parts of water; stir to dissolve all the solids in the system; then raise the temperature to 40°C, and add 2 parts of azobisisobutylamidine hydrochloride solution (mass concentration: 0.5% ), continue to pass nitrogen, and add water within 10 hours to adjust the concentration of ammonium sulfate to 25%, and obtain a uniform milky white liquid after the reaction is completed.

Embodiment 2

[0036] In a reactor equipped with a thermometer, condenser, nitrogen inlet and stirring rod, add 45 parts of ammonium sulfate, 5 parts of sodium chloride, 20 parts of methacrylamide, 80 parts of diallyldimethylammonium chloride, poly Add 10 parts of methacryloyloxyethyltrimethylammonium chloride, add 100 parts of water; stir to dissolve all the solids in the system; then raise the temperature to 35°C, and add 4 parts of hydrogen peroxide solution (mass concentration of 0.5%), 2 parts of ferrous sulfate solution (mass concentration is 0.5%), continue to pass nitrogen, and add water within 8 hours to adjust the total concentration of ammonium sulfate and sodium chloride to 20%, after the reaction, a uniform milky white liquid.

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Abstract

The invention relates to a preparation method of water-in-water type cationic polyacrylamide emulsion, which comprises the following steps of: a) adding a monomer, inorganic salt and a dispersing agent into a reactor, adding water to dissolve the mixture and controlling the mass concentration of the inorganic salt to be 30-40% to obtain a reaction liquid; b) heating the reaction liquid up to 35-50 DEG C, and filling nitrogen to remove oxygen; and c) adding an initiator into the reaction liquid, stirring for reaction for 5-12hours under the protection of nitrogen, dripping water into the reaction liquid within the period and adjusting the mass concentration of the inorganic salt to be 20-30% to obtain the emulsion product after the reaction. The method is simple. The water-in-water type cationic polyacrylamide emulsion prepared by the method has the characteristics of high molecular weight and stable storage, and is convenient and rapid to dissolve and free from secondary pollution to the environment; and the product is widely applied to various sewage treatments, especially to the dehydration treatment of the raw sludge produced by urban sewage treatment as well as the excess sludge, the mixed sludge and the digested sludge which are produced by biological method treatment.

Description

technical field [0001] The invention belongs to the technical field of polymer emulsion preparation, and in particular relates to a preparation method of water-in-water cationic polyacrylamide emulsion. Background technique [0002] The structural characteristics and complete varieties of polyacrylamide make it widely used in various fields of the national economy. It is one of the most widely used varieties of water-soluble polymers and enjoys the title of "all kinds of additives". In my country, due to the shortage of oil resources, water resources, and forest resources, the application of polyacrylamide in the three major fields of oil, water treatment and papermaking is particularly important and has strategic significance. [0003] Polyacrylamide used as a water treatment flocculant requires high molecular weight, and at the same time, different polyacrylamides should be selected according to the type of sewage to be treated. At present, a series of ionic, non-ionic an...

Claims

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Application Information

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IPC IPC(8): C08F226/02C08F220/56C08F220/34C08F2/16C02F11/14
Inventor 黄振舒鑫冉千平刘加平
Owner 江苏吉邦材料科技有限公司
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