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Preparation method of 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: 2014-12-31
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 promote the dissolution of the emulsion in water by adding a phase inversion agent to the polyacrylamide emulsion, but on the one hand, the original stability system of the emulsion is disrupted, resulting in the instability of the emulsion, and the viscosity of the emulsion gradually increases after long-term storage. Unusable; 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

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[0015] The invention provides a method for preparing polyacrylamide emulsion, wherein the method includes: (1) initiating acrylamide monomers, anionic monomers containing double bonds, polymerizable emulsifiers, chelating agents, and azo Mixing agent, oxidizing agent and water to form an aqueous solution, and adjusting the pH value of the aqueous solution to 7-9; (2) forming an oil solution with an emulsifier and an organic solvent; (3) mixing the aqueous solution with the oil solution to form an oil-in-oil solution water emulsion; (4) After deoxygenating the water-in-oil emulsion, adding a reducing agent, so that the water-in-oil emulsion undergoes polymerization reaction at a first temperature and a second temperature in sequence, and the second temperature is higher than the first temperature a temperature.

[0016] In the present invention, the polymerizable emulsifier in step (1) refers to that compared with conventional emulsifiers, in addition to having hydrophilic and ...

Embodiment 1

[0053] At 20°C, 100g of deionized water, 100g of acrylamide, 20g of acrylic acid, and 5g of monododecylamine maleate (according to the preparation method in the literature: Daily Chemical Industry, 2006, 36 (6): 345-347 ) into a 1000mL beaker, stirred evenly, and then slowly added 50% by weight of sodium hydroxide aqueous solution to adjust the pH value of the aqueous solution to 7. Then add 0.02 g of disodium edetate, 0.01 g of ammonium persulfate, and 0.05 g of azobisisobutylsulfinium hydrochloride into the beaker.

[0054] Mix 3.79g Span-80 with 4.21g Tween-80, the hydrophilic-lipophilic balance value of the obtained mixed emulsifier is 9.93, and then mix the mixed emulsifier with 90g white oil (boiling point is 200-250°C, flash point 80 ℃) completely dissolved to make an oil solution.

[0055] Add the above aqueous solution into the oil solution, and emulsify for 1 min with a high-speed shear dispersing emulsifier to obtain a stable milky white inverse emulsion. After de...

Embodiment 2

[0061] At 25°C, 150g of deionized water, 100g of acrylamide, 50g of acrylic acid, and 7.5g of monohexadecylamine maleate (according to the literature: Daily Chemical Industry, 2006, 36 (6): 345-347 prepared maleic acid Acid monododecylamine method, using maleic acid and hexadecylamine) was added into a 1000mL beaker, stirred evenly, then slowly added 50% by weight sodium hydroxide aqueous solution and adjusted the pH value of the aqueous solution to 8. Then add 0.2 g of disodium edetate, 0.2 g of ammonium persulfate, and 0.5 g of azobisisobutylsulfinium hydrochloride into the beaker.

[0062] Mix 7.2g Span-80 with 4.8g Tween-80, the hydrophilic-lipophilic balance value of the obtained mixed emulsifier is 8.58, and then mix the mixed emulsifier with 150g white oil (boiling point: distillation range 240-280°C, flash point 100 ℃) completely dissolved to make an oil solution.

[0063] Add the above aqueous solution into the oil solution, and emulsify for 1 min with a high-speed s...

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Abstract

The invention discloses a preparation method of a polyacrylamide emulsion, and the method is as follows: (1) mixing an acrylamide series monomer, a double-bond-containing negative ion monomer, a polymerizable emulsifier, a chelating agent, an azo initiator and an oxidizing agent with water to form an aqueous solution, and adjusting the aqueous solution pH value to 7-9; (2) mixing an emulsifier and an organic solvent to form an oil solution; (3) mixing the aqueous solution and the oil solution to form a water in oil emulsion; (4) deoxidizing the water in oil emulsion, adding a reducing agent for polymerization of the water in oil emulsion orderly at a first temperature and a second temperature, wherein the second temperature is higher than the first temperature. By using the method provided by the invention; the polyacrylamide emulsion with higher viscosity average molecular weight of polyacrylamide, better long-term storage stability, lower residual monomer content and rapid dissolution ability in water can be prepared.

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 an initiator. It can be used as a high-efficiency flocculant, thickener, reinforcing agent and drag reducer in liquids. It is mainly used in water treatment, papermaking additives, petroleum exploration, textile, mineral processing, medicine, agriculture and other industries, and 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 that a certain concentration of acrylamide is directly polymerized in an aqueous solution, and its products are available in two forms: aqueous solution and dry powder. Polyacrylamide aqueous solutio...

Claims

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Application Information

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IPC IPC(8): C08F220/56C08F220/58C08F2/32C08F4/40
Inventor 张文龙黄凤兴林蔚然
Owner CHINA PETROLEUM & CHEM CORP
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