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Method for preparing polyacrylamide emulsion

A technology of polyacrylamide and acrylamide series, which is applied in the field of preparation of polyacrylamide emulsion, and can solve problems such as disturbance of emulsion stability system, increase of emulsion production cost, and increase of emulsion viscosity

Active Publication Date: 2015-03-18
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The above methods all add a phase inversion agent to the polyacrylamide emulsion to promote the dissolution of the emulsion in water, but on the one hand, because the original stability system of the emulsion is disrupted, the emulsion is unstable, and the viscosity of the emulsion gradually increases after long-term storage. Finally, it cannot be used; on the other hand, the addition of a phase inversion agent increases the production cost of the emulsion and causes secondary environmental pollution during use

Method used

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  • Method for preparing polyacrylamide emulsion

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[0017] The present invention provides a method for preparing a polyacrylamide emulsion, wherein the method includes: (1) combining an acrylamide-based monomer, an anionic monomer containing a double bond, a polymerizable emulsifier represented by formula 1, and a chelating agent , Azo initiator, oxidant and water are mixed to form an aqueous solution, and the pH of the aqueous solution is adjusted to 7-9; (2) The emulsifier and organic solvent are formed into an oil solution; (3) The pH is set to 7-9 (4) After the water-in-oil emulsion is deoxygenated, a reducing agent is added to make the water-in-oil emulsion polymerize at the first temperature and the second temperature in sequence. Reaction, the second temperature is higher than the first temperature,

[0018]

[0019] Wherein, n is an integer of 1-30, and m is an integer of 5-30.

[0020] In the present invention, the polymerizable emulsifier shown in formula 1 in step (1) means that, compared with conventional emulsifiers, i...

Embodiment 1

[0056] At 20°C, 100g of deionized water, 100g of acrylamide, 20g of acrylic acid, 5g of lauryl polyoxyethylene ether-15 maleic acid monoester sodium (according to literature: Fine and Specialty Chemicals, 2007, 15 (11) : Prepared by the preparation method of 10-14) was added to a 1000 mL beaker, stirred evenly, and then slowly added 50 wt% sodium hydroxide aqueous solution to adjust the pH value of the aqueous solution to 7. Then, 0.02 g of disodium edetate, 0.01 g of ammonium persulfate, and 0.05 g of azobisisobutyl hydrochloride were added to the beaker.

[0057] Mix 3.79g Span-80 with 4.21g Tween-80, the resulting mixed emulsifier has a hydrophilic-lipophilic balance value of 9.93, and then mix the mixed emulsifier with 90g white oil (boiling point is 200-250℃, flash point is 80 ℃) Dissolve completely to make an oil solution.

[0058] The above aqueous solution was added to the oil solution and emulsified with a high-speed shear dispersing emulsifier for 1 min to obtain a stabl...

Embodiment 2

[0064] At 25°C, 150g of deionized water, 100g of acrylamide, 50g of acrylic acid, 7.5g of laureth-8 monoester sodium (according to literature: Fine and Specialty Chemicals, 2007, 15 (11 ): The method for preparing lauryl polyoxyethylene ether-15 maleic acid monoester sodium in 10-14 is prepared by using lauryl polyoxyethylene ether-8 instead of lauryl polyoxyethylene ether-15). In a 1000 mL beaker, stir evenly, then slowly add 50% by weight aqueous sodium hydroxide solution and adjust the pH value of the aqueous solution to 8. Then add 0.2 g of disodium ethylenediaminetetraacetic acid, 0.2 ammonium persulfate, and 0.5 azobisisobutyl hydrochloride into the beaker.

[0065] Mix 7.2g Span-80 with 4.8g Tween-80, the resulting mixed emulsifier has a hydrophilic-lipophilic balance value of 8.58, and then the mixed emulsifier and 150g white oil (boiling point is 240-280℃, flash point is 100 ℃) Completely dissolve into oil solution.

[0066] The above aqueous solution was added to the oi...

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Abstract

The invention discloses a method for preparing a polyacrylamide emulsion. The method comprises the following steps: mixing an acrylamide monomer, a double-bond-containing anionic monomer, a polymerizable emulsifier as shown in a formula 1 in the specification (n is an integer from 1-30, and m is an integer of 5-30), a chelating agent, an azo initiator, an oxidant and water to form an aqueous solution, and regulating the pH value of the aqueous solution to be 7-9; (2) mixing the emulsifier and an organic solvent to form an oil solution; (3) mixing the aqueous solution of which the pH value is 7-9 and the oil solution to form a water-in-oil emulsion; and (4) removing oxygen from the water-in-oil emulsion, and adding a reducing agent to react the water-in-oil emulsion sequentially at a first temperature and a second temperature, wherein the second temperature is higher than the first temperature. By adopting the method, the polyacrylamide emulsion which can be quickly dissolved in water, is good in stability of long-time storage, and has a relatively low content of monomer remained can be prepared, and the polyacrylamide has a relatively high viscosity-average molecular weight.

Description

Technical field [0001] The invention relates to a preparation method of polyacrylamide emulsion. Background technique [0002] Polyacrylamide is a general term for water-soluble polymers prepared by homopolymerization or copolymerization of acrylamide monomers under the action of initiators. It can be used as high-efficiency flocculants, thickeners, enhancers and drag reducers in liquids. Mainly used in water treatment, papermaking additives, petroleum exploration, textiles, mineral processing, medicine, agriculture and other industries, it is known as "Auxiliaries for all industries". [0003] The production methods of polyacrylamide mainly include aqueous solution polymerization and inverse emulsion polymerization. The aqueous solution polymerization method is the direct polymerization of a certain concentration of acrylamide in an aqueous solution, and its products come in two forms: aqueous solution and dry powder. The aqueous solution of polyacrylamide has a high viscosity, ...

Claims

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Application Information

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IPC IPC(8): C08F220/56C08F220/06C08F220/58C08F222/20C08F290/06C08F2/26C08F2/30
Inventor 张文龙伊卓刘希赵方园林蔚然方昭祝纶宇杜超
Owner CHINA PETROLEUM & CHEM CORP
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