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Method for synthesizing acrylic acid-maleic anhydride copolymer in aqueous phase by RAFT method

A technology of maleic anhydride and acrylic acid, applied in chemical instruments and methods, organic cleaning compositions, cleaning compositions containing organic compounds, etc., can solve problems such as less research reports on aqueous RAFT polymerization, and achieve the effect of high dispersibility

Active Publication Date: 2013-01-02
GUANGZHOU LIBY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the existing reports on RAFT active polymerization in aqueous solution, although the aqueous active polymerization of various monomers of acrylamide has been successfully realized, and the molecular weight distribution of the polymer is well controlled, the aqueous RAFT polymerization of acidic monomers There are few research reports

Method used

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  • Method for synthesizing acrylic acid-maleic anhydride copolymer in aqueous phase by RAFT method
  • Method for synthesizing acrylic acid-maleic anhydride copolymer in aqueous phase by RAFT method
  • Method for synthesizing acrylic acid-maleic anhydride copolymer in aqueous phase by RAFT method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Add 13.3 g of maleic anhydride to the reactor, then add 8.6 g of bis(carboxymethyl)trithiocarbonate (RAFT reagent 8) and 132 g of distilled water and stir to dissolve. Heat up to 70°C, start to drop 133g of acrylic acid and 26g of 19% sodium persulfate aqueous solution into the reaction system at the same time, stir at a constant speed, and dropwise for 30 minutes. After the acrylic acid and sodium persulfate solution are added dropwise, the mixture is incubated at 69-71° C. for 60 minutes. Then control the temperature of the reactor not to exceed 40° C., add 169 g of sodium hydroxide solution with a mass fraction of 46.7% into the reactor to neutralize to a pH value of 7, and obtain an acrylic acid-maleic anhydride copolymer. The obtained acrylic acid-maleic anhydride copolymer had a weight average molecular weight of 11000 and a molecular weight distribution of 1.9.

Embodiment 2

[0036] Add 19.2 g of maleic anhydride to the reactor, then add 2.86 g of bis(carboxymethyl)trithiocarbonate (RAFT reagent 8) and 129 g of distilled water and stir to dissolve. Heat up to 80°C, and simultaneously start to drop 123.8g of acrylic acid and 43g of 33% potassium persulfate aqueous solution into the reaction system, stirring at a constant speed, and the dropping time is 60 minutes. After the acrylic acid and potassium persulfate solution are added dropwise, the mixture is incubated at 79-81° C. for 180 minutes. Then control the temperature of the reactor not to exceed 40° C., add 169 g of sodium hydroxide solution with a mass fraction of 46.7% into the reactor to neutralize to a pH value of 7, and obtain an acrylic acid-maleic anhydride copolymer. The obtained acrylic acid-maleic anhydride copolymer had a weight average molecular weight of 11000 and a molecular weight distribution of 2.8.

Embodiment 3

[0038] Add 13.3 g of maleic anhydride to the reactor, then add 5.85 g of bis(carboxymethyl)trithiocarbonate (RAFT reagent 8) and 132 g of distilled water and stir to dissolve. Heat up to 70° C., start to drop 133 g of acrylic acid and 33 g of ammonium persulfate aqueous solution with a mass fraction of 22% into the reaction system at the same time, stir at a constant speed, and the dropwise addition time is 30 minutes. After the acrylic acid and ammonium persulfate solution are added dropwise, the mixture is incubated at 69-71° C. for 120 minutes. Then control the temperature of the reactor not to exceed 40° C., add 169 g of sodium hydroxide solution with a mass fraction of 46.7% into the reactor to neutralize to a pH value of about 7, and obtain an acrylic acid-maleic anhydride copolymer. The obtained acrylic acid-maleic anhydride copolymer had a weight average molecular weight of 23000 and a molecular weight distribution of 2.3.

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Abstract

The invention discloses a method for synthesizing an acrylic acid-maleic anhydride copolymer in an aqueous phase by a reversible addition-fragmentation chain transfer (RAFT) method. The synthesizing method comprises the following steps of: adding maleic anhydride into a reactor, adding RAFT reagent and distilled water, stirring and dissolving; heating to the temperature of between 70 and 90 DEG C, slowly dripping acrylic acid monomer and peroxide initiator, and stirring at a constant speed; after the acrylic acid monomer and the peroxide initiator are completely dripped, preserving the heat at the temperature of between 70 and 90 DEG C, and curing for 60 to 180 minutes till the residual quantity of the maleic anhydride monomer is less than 100ppm; and controlling the temperature of the reactor not to exceed 40 DEG C, adding alkali into the reactor, regulating the pH value to be 7, and obtaining the acrylic acid-maleic anhydride copolymer. The weight-average molecular weight of the water-soluble acrylic acid-maleic anhydride copolymer synthesized by adopting the method is 2,000 to 23,000, the molecular weight distribution is 1.3 to 3.0, and the copolymer has high dispersion performance. The polymer can be used as a water-based dispersant, a scale inhibitor and an auxiliary agent for washing according to the difference of molecular weight.

Description

technical field [0001] The invention belongs to the field of organic chemistry, and in particular relates to a method for synthesizing an acrylic acid-maleic anhydride copolymer in an aqueous phase by a RAFT method. Background technique [0002] Acrylic acid-maleic anhydride copolymer is a polymer with high charge density. Depending on the molecular weight, it can be used as a dispersant in the petroleum and mining industries, a washing aid, a textile printing and dyeing aid, and a scale inhibitor in circulating water treatment. Water reducing agent for cement, etc. Therefore, using different process conditions to synthesize acrylic acid-maleic anhydride copolymers with different molecular weights to meet the needs of applications has always been a research focus. [0003] Currently, the RAFT (reversible addition-fragmentation chain transfer) polymerization method is to add a dithioester (ZCS) with a high chain transfer constant and a specific structure to the traditional r...

Claims

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Application Information

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IPC IPC(8): C08F220/06C08F222/06C08F2/38B01F17/52C02F5/10C11D3/37C11D9/26C09K23/52
Inventor 胡灏张利萍
Owner GUANGZHOU LIBY
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