A kind of high molecular weight hydroxamated polyacrylamide emulsion and preparation method thereof

A technology of polyacrylamide and high molecular weight, which is applied in the field of high molecular weight hydroxamated polyacrylamide emulsion and its preparation, which can solve the problems of high reaction temperature, shorten the reaction time, improve the conversion rate of hydroxylamine, and prevent volatilization

Active Publication Date: 2022-05-24
GUANGDONG RES INSTITITUTE OF PETROCHEM & FINE CHEM ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem of high reaction temperature in the existing hydroxamated polyacrylamide emulsion production process, provide a high molecular weight hydroxamated polyacrylamide emulsion and its preparation method, and carry out emulsion polymerization at a relatively low temperature reaction and hydroxamation reaction to obtain high molecular weight hydroxamated polyacrylamide emulsion

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  • A kind of high molecular weight hydroxamated polyacrylamide emulsion and preparation method thereof
  • A kind of high molecular weight hydroxamated polyacrylamide emulsion and preparation method thereof
  • A kind of high molecular weight hydroxamated polyacrylamide emulsion and preparation method thereof

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Embodiment 1

[0031] The preparation method of the high molecular weight oxyxime acidified polyacrylamide emulsion provided in the present embodiment is:

[0032] S1: Emulsion polymerization process

[0033] (1) Preparation of aqueous phase: under stirring, the monomer 2-acrylamide-2-methylpropanesulfonic acid (AMPS) is dissolved in deionized water to prepare a 50% (wt) aqueous solution, and then a monomer acrylic acid (AA) is added, and pH ≈8 (control temperature is not more than 20 ° C) is adjusted with 42% (wt) liquid alkali; and then monomer acrylamide (AM) and deionized water are added to form an aqueous solution with a monomer concentration of 50% (wt). The addition of the initiator sodium hypophosphite (SHP) to the aqueous solution initiates a prepolymerization reaction to form a comonomy aqueous phase. Among them, the molar ratio of AM, AA, AMPS, and SHP is 60:25:15:0.11.

[0034] (2) Preparation of oil phase: Under stirring, Span-80 (sorbitan fatty acid ester) and 6501 (coconut oil fat...

Embodiment 2

[0041] The preparation method of the high molecular weight oxyxime acidified polyacrylamide emulsion provided in the present embodiment is:

[0042] S1: Emulsion polymerization process

[0043] Same as Step 1 of Example S1.

[0044] S2: Oxime acidification process

[0045] (1) Preparation of the aqueous phase: with Step 1 of the Same Embodiment S2 (1).

[0046](2) Preparation of oil phase: According to the mass ratio of 13.5:1, the 120# solvent oil is mixed with 1802 (industrial ethoxylated fatty amine, EO=2), and the clarified oil phase is evenly stirred to obtain a clear oil phase.

[0047] (3) Oxime acidification reaction: according to the weight of the parts, the polyacrylamide emulsion prepared by 35 parts of step S1 is added to the stainless steel sandwich cylinder, 7 parts of the oil phase are added, dispersed for 10min and then added 18 parts of the aqueous phase after the oxoxime acidification reaction at 25 ~ 45 °C, and the reaction is obtained after 2.5h to obtain the o...

Embodiment 3

[0049] The preparation method of the high molecular weight oxyxime acidified polyacrylamide emulsion provided in the present embodiment is:

[0050] S1: Emulsion polymerization process

[0051] Same as Step 1 of Example S1.

[0052] S2: Oxime acidification process

[0053] (1) Preparation of the aqueous phase: with Step 1 of the Same Embodiment S2 (1).

[0054] (2) Preparation of oil phase: According to the mass ratio of 14:1, the 150# solvent oil is mixed with 1802 (industrial ethoxylated fatty amine, EO=2), and the clarified oil phase is stirred to obtain a clear oil phase.

[0055] (3) Oxyme acidification reaction: according to the weight of the parts, the 32 parts of the polyacrylamide emulsion prepared in step S1 was added to the stainless steel sandwich cylinder, 9 parts of the oil phase were added, and after dispersing for 10 minutes, 18 parts of the aqueous phase were added to the oxyme acidification reaction at 25 ~ 45 ° C, and the reaction was obtained after 2h to obtain...

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Abstract

The invention provides a high-molecular-weight hydroxamated polyacrylamide emulsion and a preparation method thereof. The preparation method is as follows: S1: mixing the monomer and sodium hypophosphite, and adjusting the pH with liquid alkali to obtain an aqueous phase; Add sorbitan fatty acid ester and coconut oil fatty acid diethanolamide to form an oil phase; mix the water phase with the oil phase, and carry out polymerization reaction under the action of ammonium persulfate at 45-50°C in an inert atmosphere to obtain polyacrylamide Emulsion; S2: add sodium thiosulfate and liquid caustic soda to hydroxylamine sulfate aqueous solution to make water phase; mix industrial ethoxylated fatty amine and industrial solvent oil to form oil phase; disperse polyacrylamide emulsion in oil phase , then add the water phase, and react at 25-45°C for more than 1.5h. The invention can obtain high-stable high-molecular-weight hydroxamated polyacrylamide emulsion at relatively low temperature by rationally selecting raw materials and processes, and reduces the loss of molecular weight before and after hydroxamation.

Description

Technical field [0001] The present invention belongs to the field of polymer synthesis technology, in particular to a high molecular weight oxyme acidified polyacrylamide emulsion and preparation method thereof. Background [0002] Oxime acidified polyacrylamide emulsion is a common flocculant for separating red mud in the process of Bayer's production of alumina, compared with conventional flocculants, oxime acidified polyacrylamide emulsion has the advantages of less addition, high sedimentation rate, low overflow float content, high bottom solid content, and the small flocil formed during use is more solid. During the flocculation of red mud by oxyme acidified polyacrylamide emulsion, the metal elements in the red mud are chelated by the oxime acid functional group in it, thereby adsorbing on the surface of the red mud particles and causing it to settle. The molecular weight of oxyxime acidified polyacrylamide has a huge impact on the flocculation capacity of red mud, in gener...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F8/32C08F220/58C08F220/06C08F220/56C08F2/30
CPCC08F8/32C08F220/58C08F2/30C08F2500/01
Inventor 缪飞栾安博邱美坚冯璐汤小燕
Owner GUANGDONG RES INSTITITUTE OF PETROCHEM & FINE CHEM ENG
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