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Method for preparing aqueous emulsion of polyacrylic acid

A technology of polyacrylic acid and water emulsion, which is applied in the field of petrochemical design, which can solve the problems of post-processing or inconvenient use, poor heat transfer effect, high product viscosity, etc., achieve fast dissolution speed, expand application fields, and low apparent viscosity Effect

Inactive Publication Date: 2012-05-30
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the poor heat transfer effect of the bulk polymerization method, it is easy to cause explosion polymerization; the product obtained by the aqueous solution polymerization method has a high viscosity; and the emulsion polymerization method brings inconvenience to post-processing or use due to the use of organic solvents

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Add 535g of deionized water, 100g of acrylic acid, and 50g of methacrylic acid into a 1000ml four-neck flask with a stirring device, a nitrogen device, a heating device, and a temperature control device, stir well, add 85g of 40% sodium hydroxide for neutralization, and then Add 20g of sodium chloride, 95g of sodium sulfate, 10g of stabilizer, 50g of isopropanol, 25g of 0.01N EDTA disodium salt solution, stir to dissolve, pass N 2 Remove oxygen, raise the temperature to 50°C, add 10g of 0.5% ammonium persulfate solution, 10g of 0.5% sodium bisulfite and stir for about 2-3 hours, the reaction solution will gradually turn white, and then add 0.5% azobisisobutylene after 3 hours Amidine hydrochloride solution 10g, and then continue to finish after the total reaction time of 16h. The product is a white emulsion. The pH value is 5.8, the apparent viscosity is 215mPaS, and the measured intrinsic viscosity is 9.2dl / g.

Embodiment 2

[0037] Add 455g of deionized water, 100g of acrylic acid, and 50g of methacrylic acid into a 1000ml four-neck flask with a stirring device, a nitrogen device, a heating device, and a temperature control device, stir well, add 125g of 40% sodium hydroxide to neutralize, and then Add 20g of sodium chloride, 135g of sodium sulfate, 10g of stabilizer, 50g of isopropanol, 30g of 0.01N EDTA disodium salt solution, stir to dissolve, pass N 2 Deoxidize, heat up to 50°C, add 10g of 0.5% ammonium persulfate solution, 10g of 0.5% sodium bisulfite, stir for about 2--3h, the reaction solution slowly turns white, add 0.5% azobisisobutyl after 4h 5 g of amidine hydrochloride solution, and then add 5 g of 0.5% azobisisobutylamidine hydrochloride solution for another 6 hours, and continue the reaction for a total of 16 hours before ending. The product is a white emulsion. The pH value is 7.0, the apparent viscosity is 288mPaS, and the measured intrinsic viscosity is 8.6dl / g.

Embodiment 3

[0039] Add 522g of deionized water, 50g of acrylic acid, and 100g of methacrylic acid into a 1000ml four-neck flask with a stirring device, a nitrogen device, a heating device, and a temperature control device, stir well, add 98g of 40% sodium hydroxide for neutralization, and then Add 20g of sodium chloride, 85g of sodium sulfate, 10g of stabilizer, 50g of isopropanol, 35g of 0.01N EDTA disodium salt solution, stir to dissolve, pass N 2Deoxidize, heat up to 50°C, add 10g of 0.5% ammonium persulfate solution, 10g of 0.5% sodium bisulfite, stir for about 2--3h, the reaction solution slowly turns white, add 0.5% azobisisobutyl after 4h 5 g of amidine hydrochloride solution, and then add 5 g of 0.5% azobisisobutylamidine hydrochloride solution for another 6 hours, and continue the reaction for a total of 16 hours before ending. The product is a white emulsion. The pH value is 6.4, the apparent viscosity is 223mPaS, and the measured intrinsic viscosity is 7.3dl / g.

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PUM

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Abstract

The invention relates to a method for preparing the aqueous emulsion of a polyacrylic acid, which is characterized in that: based on the total weight, the aqueous emulsion of the polyacrylic acid comprises the following components in percentage by weight: 10.0 to 20.0 percent of arylic acid-methacrylate copolymer, 10.0 to 20.0 percent of inorganic salt, 3.0 to 8.0 percent of isopropyl alcohol, 1.0 to 2.0 percent of stabilizing agent, 0.05 to 0.15 percent of initiator, 0.0 to 0.2 percent of aid and the balance of water. The method comprises the following steps of: dissolving an arylic acid andmethacrylate into the water in determined proportion, neutralizing the mixed solution with sodium hydroxide until a pH value is 5 to 7, adding the inorganic salt, the isopropyl alcohol, the stabilizing agent, the initiator and the aid in determined proportion for uniform mixing, introducing nitrogen, removing oxygen and performing stirring reaction under the protection of the nitrogen at 50 DEG Cfor 16 hours to obtain the aqueous emulsion of the polyarylic acid of the invention. The aqueous emulsion of the polyarylic acid is stable milky liquid prepared from a water-soluble polymer by takingthe water as a medium, and has the advantages of low apparent viscosity, environmental friendliness and convenient use.

Description

Technical field: [0001] The invention relates to a preparation method of polyacrylic acid aqueous emulsion, which belongs to the technical field of petrochemical engineering design. Background technique: [0002] Acrylic acid polymer is a very important class of water-soluble polymer compounds. Because of its high cohesive energy, strong adsorption force, and high reactivity, it is widely used in coatings, papermaking, textiles, oil extraction, mining, metallurgy, food, and medicine. , cosmetics, civil engineering and water treatment industries. The synthesis methods of acrylic acid usually include bulk polymerization, aqueous solution polymerization and emulsion polymerization. The bulk polymerization method is easy to cause detonation due to poor heat transfer effect; the product obtained by the aqueous solution polymerization method has a high viscosity; and the emulsion polymerization method is inconvenient for post-processing or use due to the use of organic solvents. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/06
Inventor 马斐王颖夏峥嵘陈昌青李松杰李国麟
Owner CHINA NAT OFFSHORE OIL CORP