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CN-121991304-A - Emulsion type polyacrylamide and preparation method thereof

CN121991304ACN 121991304 ACN121991304 ACN 121991304ACN-121991304-A

Abstract

The invention discloses emulsion type polyacrylamide and a preparation method thereof, which belong to the technical field of polymer emulsion and are prepared from the following raw materials of 20-40 parts of acrylamide monomers, 15-25 parts of cationic monomers, 10-15 parts of dispersion stabilizer, 35-45 parts of ammonium sulfate, 2-3 parts of initiator, 7-8 parts of modified nano alumina and 70-80 parts of water. The emulsion type polyacrylamide emulsion synthesized by the invention is cationic type polyacrylamide emulsion, takes modified nano alumina as a core structure, and takes a copolymer synthesized by acrylamide monomers and cationic monomers as a shell structure. The synthesized cationic polyacrylamide emulsion integrates flocculant and catalyst, has adsorption, flocculation and degradation properties, and the dispersibility of the cationic polyacrylamide emulsion is greatly improved.

Inventors

  • CHEN XI
  • YUN JIAN
  • WU QIAN
  • LIU XIAODAN
  • LI KAI
  • LI XIUMIN
  • LI YING
  • YANG ZHONGPING
  • WANG ZHANSHENG
  • WANG LIRONG
  • CHEN HONGKUN
  • JIAO WEI
  • WANG YIHAN
  • ZHANG SHUDE

Assignees

  • 中国石油天然气集团有限公司
  • 中国石油集团安全环保技术研究院有限公司
  • 北京中油爱索节能环保技术有限公司

Dates

Publication Date
20260508
Application Date
20241104

Claims (10)

  1. 1. The emulsion type polyacrylamide is characterized by comprising, by weight, 20-40 parts of acrylamide monomers, 15-25 parts of cationic monomers, 10-15 parts of dispersion stabilizers, 35-45 parts of ammonium sulfate, 2-3 parts of initiators, 7-8 parts of modified nano alumina and 70-80 parts of water.
  2. 2. The emulsion type polyacrylamide according to claim 1, wherein the emulsion type polyacrylamide has a core-shell structure, the inner core of the emulsion type polyacrylamide is modified nano alumina, and the shell of the emulsion type polyacrylamide is a copolymer of an acrylamide monomer and a cationic monomer.
  3. 3. The emulsion type polyacrylamide according to claim 2, wherein the cationic monomer is selected from one or two of acryloyloxyethyl trimethyl ammonium chloride, methacryloyloxyethyl trimethyl ammonium chloride or N, N-dimethyldiallyl ammonium chloride.
  4. 4. The emulsion type polyacrylamide according to claim 2, wherein the acrylamide monomer is one or two selected from the group consisting of acrylamide, methacrylamide, N-methacrylamide and N, N-dimethylacrylamide.
  5. 5. The emulsion type polyacrylamide according to claim 2, wherein the initiator comprises one or more of ammonium persulfate, sodium persulfate and sodium sulfite, and the dispersion stabilizer is selected from any one of polymethyl acryloyloxyethyl trimethyl ammonium chloride, polyacrylamide propyl trimethyl ammonium chloride or polyethylene oxide block polymethyl methacrylate.
  6. 6. The emulsion type polyacrylamide according to any one of claims 1 to 5, wherein the preparation method of the modified nano alumina comprises the following steps: dispersing nano alumina in water to form suspension; After carrying out ultrasonic dispersion on the suspension, adding a silane coupling agent to carry out stirring reaction; and (3) sequentially centrifuging, filtering, drying and grinding the reacted product to obtain the modified nano-alumina.
  7. 7. The emulsion type polyacrylamide according to claim 6, wherein the weight ratio of the silane coupling agent to the nano alumina is 1:15-20, and the mass fraction of the nano alumina in the suspension is 6-10%.
  8. 8. The emulsion type polyacrylamide according to claim 6, wherein the temperature of the stirring reaction is 50-70 ℃ for 20-40min; The rotational speed of the centrifugation is 2000-3500r/min, and the time is 5-8min; the drying temperature is 50-60 ℃ and the drying time is 20-24h.
  9. 9. A method for preparing the emulsion type polyacrylamide according to any one of claims 1 to 8, comprising the steps of: mixing acrylamide monomer, cationic monomer, dispersion stabilizer, ammonium sulfate, modified nano alumina and water to prepare premix; And adding an initiator into the premix under the protection atmosphere and heating conditions to initiate polymerization reaction, and obtaining the emulsion type polyacrylamide after the polymerization reaction is completed.
  10. 10. The method for preparing the emulsion type polyacrylamide according to claim 9, wherein the polymerization reaction is carried out at a temperature of 40-60 ℃ for 8-15 hours.

Description

Emulsion type polyacrylamide and preparation method thereof Technical Field The invention belongs to the technical field of high molecular emulsion, and particularly relates to emulsion polyacrylamide and a preparation method thereof. Background Polyacrylamide is structurally divided into cationic, anionic, zwitterionic and nonionic. Cationic polyacrylamide is a copolymer consisting of polyacrylamide and cationic structural units. The molecular chain of the cationic polyacrylamide is usually provided with quaternary ammonium groups, and the cationic polyacrylamide is positively charged in both an acidic system and a basic system. In industrial wastewater, colloid particles are usually negatively charged, and cationic polyacrylamide can be used for adsorbing suspended particles in water, so that the particles are aggregated into larger flocs through mechanisms such as electric neutralization, adsorption bridging and the like, and pollutants in water are removed by sedimentation. Moreover, the cationic polyacrylamide has the advantages of small dosage, low toxicity, easy post-treatment and the like, and is widely applied to industries such as water treatment, oil fields, papermaking and the like. The preparation method of the cationic polyacrylamide mainly comprises an aqueous solution polymerization method, an inverse emulsion polymerization method, an inverse microemulsion method, a dispersion polymerization method, a template polymerization method and the like. The product produced by the aqueous solution polymerization method has low solid content, is not easy to dissipate heat and is easy to explode, the reverse emulsion polymerization method and the reverse microemulsion method generally use emulsifying agents and hydrocarbon substances, which can cause environmental pollution, and the template polymerization method has higher production cost and more complex process. The dispersion polymerization method is a polymerization reaction carried out in an aqueous solution of an inorganic salt, and an aqueous dispersion system similar in appearance to an emulsion can be obtained after the reaction. The dispersion polymerization method has the characteristics of simple process, high reaction speed and uniform heat dissipation. However, the cationic polyacrylamide emulsion prepared by the existing dispersion polymerization method still has the problems of poor stability, short storage time, poor solubility, poor flocculation effect and the like. Disclosure of Invention The invention mainly aims to provide emulsion type polyacrylamide and a preparation method thereof, which are used for solving the problems of poor stability, short storage time, poor solubility, poor flocculation effect and the like of the existing polyacrylamide emulsion. In order to achieve the aim, the invention provides emulsion type polyacrylamide which is prepared from the following raw materials, by weight, 20-40 parts of acrylamide monomers, 15-25 parts of cationic monomers, 10-15 parts of dispersion stabilizers, 35-45 parts of ammonium sulfate, 2-3 parts of initiators, 7-8 parts of modified nano alumina and 70-80 parts of water. Further, the emulsion type polyacrylamide has a core-shell structure, the inner core of the emulsion type polyacrylamide is modified nano alumina, and the shell of the emulsion type polyacrylamide is a copolymer of acrylamide monomers and cationic monomers. Further, the cationic monomer is selected from one or two of acryloyloxyethyl trimethyl ammonium chloride, methacryloyloxyethyl trimethyl ammonium chloride or N, N-dimethyl diallyl ammonium chloride. Further, the acrylamide monomer is selected from one or two of acrylamide, methacrylamide, N-methylacrylamide or N, N-dimethylacrylamide. Further, the initiator includes one or more of ammonium persulfate, sodium persulfate, and sodium sulfite. Further, the dispersion stabilizer is selected from any one of polymethyl acryloyloxyethyl trimethyl ammonium chloride, polyacrylamide propyl trimethyl ammonium chloride or polyethylene oxide block polymethyl sodium acrylate. Further, the preparation method of the modified nano alumina comprises the following steps: dispersing nano alumina in water to form suspension; After carrying out ultrasonic dispersion on the suspension, adding a silane coupling agent to carry out stirring reaction; and (3) sequentially centrifuging, filtering, drying and grinding the reacted product to obtain the modified nano-alumina. Further, the weight ratio of the silane coupling agent to the nano alumina is 1:15-20. Further, the mass fraction of the nano alumina in the suspension is 6-10%. Further, the temperature of the stirring reaction is 50-70 ℃ and the time is 20-40min. Further, the rotational speed of the centrifugation is 2000-3500r/min, and the time is 5-8min. Further, the drying temperature is 50-60 ℃ and the drying time is 20-24 hours. In another aspect of the present invention, a preparation method of the emulsion type polyacrylamide