A method for preparing cationic polyacrylamide emulsion by water dispersion polymerization

A technology of polyacrylamide and dispersion polymerization, applied in chemical instruments and methods, water pollutants, water/sewage treatment, etc., can solve the problems of reduced particle swelling, complex demulsification process, high production cost, etc., and achieve good stability Sexuality and fluidity, avoid mutual aggregation, fast dissolution effect

Active Publication Date: 2020-02-18
广东首信环保材料科技有限公司
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Problems solved by technology

However, the solid content of the product obtained by the aqueous solution polymerization method is low, and it is not easy to dissipate heat during the reaction process, and it is easy to form a cross-linked product that is insoluble or insoluble in water after an imidization cross-linking reaction, and the relative molecular weight is difficult to control; if a dry powder product is used, The mechanical degradation of CPAM will occur during the drying and pulverizing process, which will affect the flocculation performance and consume a lot of energy
Inverse emulsion or microemulsion polymerization has the following disadvantages: in the preparation process, a large amount of organic solvents such as surfactants and hydrocarbons need to be used, the production cost is high, the product stability is poor, the subsequent demulsification process is complicated, and it is easy to cause secondary pollution to the environment , and the purity of CPAM is also affected, so it cannot be used in the field of drinking water purification
However, the emulsion prepared by this technology has poor stability (up to two months) and relatively low molecular weight (2.7-3.5 million), probably because tert-butanol is added as a reaction medium, and monomer and oligomer free radicals are swelled. If the channel diffuses to the inside of the particle and undergoes solid-phase polymerization, adding tert-butanol and increasing the concentration will reduce the swelling degree of the particle, and the diffusion rate of free radicals in the liquid phase to the inside of the particle will decrease, so that the rate of solid-phase polymerization will decrease. decrease, resulting in lower molecular weight polymers
At the same time, when tert-butanol is added, the solubility of the dispersion stabilizer in the mixed solvent dispersion medium also becomes poor, resulting in poor dispersion of the polymer emulsion in the system, resulting in low stability

Method used

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  • A method for preparing cationic polyacrylamide emulsion by water dispersion polymerization
  • A method for preparing cationic polyacrylamide emulsion by water dispersion polymerization
  • A method for preparing cationic polyacrylamide emulsion by water dispersion polymerization

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Embodiment 1

[0050] Acrylamide 11.88g, methacryloyloxyethyltrimethylammonium chloride (80wt%) 7.85g, polymethacryloyloxyethyltrimethylammonium chloride aqueous solution (16wt%, molecular weight 1.09×10 6 g / mol) 16.875g, ammonium sulfate 35.2g, edetate disodium 0.025g, and deionized water 44.37g were mixed and stirred to form a homogeneous solution, and poured into a container equipped with a mechanical stirrer, a condenser tube, a thermometer and a nitrogen conduit. In a 250ml four-necked flask, stir at a constant speed of 350rpm in a constant temperature water bath at 56°C, and pass nitrogen gas for 30min, then inject 0.7ml of 0.5wt% graphene oxide aqueous solution (when preparing 0.5wt% graphene oxide aqueous solution, Ultrasonic dispersion for 30 minutes to make graphene oxide dissolve uniformly in the aqueous solution) and 1.4ml of 0.5wt% ammonium persulfate aqueous solution were injected into the reaction system, and the reaction continued until the system became viscous, and after 3.5...

Embodiment 2

[0053] Acrylamide 11.88g, acryloyloxyethyltrimethylammonium chloride (80wt%) 7.85g, polyacryloyloxyethyltrimethylammonium chloride aqueous solution (16wt%, molecular weight 1.39×10 6 g / mol) 18.00g, ammonium sulfate 37.2g, disodium edetate 0.025g, and deionized water 45.045g were mixed and stirred to form a homogeneous solution, and poured into a container equipped with a mechanical stirrer, a condensation tube, a thermometer and a nitrogen conduit. In a 250ml four-neck flask, stir at a constant speed of 400rpm in a constant temperature water bath at 56°C, and pass nitrogen gas for 30min, then inject 0.7ml of 0.5wt% graphene oxide aqueous solution and 1.4ml of 0.5wt% ammonium persulfate aqueous solution into In the reaction system, continue the reaction until the system becomes viscous. After 4 hours, add 0.3ml of 0.5wt% graphene oxide aqueous solution and 0.6ml of 0.5wt% ammonium persulfate aqueous solution. After 12 hours of reaction, add the remaining 2.0g of ammonium sulfate...

Embodiment 3

[0055] Acrylamide 11.88g, methacryloyloxyethyltrimethylammonium chloride (80wt%) 3.93g, acryloyloxyethyltrimethylammonium chloride (80wt%) 3.93g, polymethacryloyloxy Ethyltrimethylammonium chloride aqueous solution (16wt%, molecular weight 1.61 * 106g / mol) 18.00g, ammonium sulfate 37.2g, edetate disodium 0.025g, deionized water 45.045g are mixed and stirred to form a homogeneous solution, Pour it into a 250ml four-neck flask equipped with a mechanical stirrer, a condenser, a thermometer and a nitrogen conduit, stir at a constant speed at a stirring rate of 350rpm in a constant temperature water bath at 50°C, and pass nitrogen for 30min, then use a syringe to inject 0.7ml of 0.5wt% Graphene oxide aqueous solution and 2.1ml of 0.5wt% ammonium persulfate aqueous solution were injected into the reaction system, and the reaction was continued until the system became viscous. After 3 hours, 0.3ml of 0.5wt% graphene oxide aqueous solution and 0.9ml of 0.5wt% Ammonium persulfate aqueo...

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Abstract

The invention discloses a method for preparing cationic polyacrylamide emulsion in an aqueous dispersion polymerization manner. The preparation method comprises the following steps: dissolving nonionic monomers, cationic monomers, a dispersion stabilizer, parital inorganic salts and additives in deionized water, stirring in a constant-temperature water bath at 40 to 70 DEG C to form a homogenous system, introducing nitrogen to remove oxygen, adding an initiator accounting for 50 to 80 percent of the total weight of an initiator raw material, continuously reacting for 3 to 6 h, adding the remaining initiator, then reacting, and adding the remaining inorganic salts, continuously stirring, thus obtaining the cationic polyacrylamide emulsion. A novel oxidization reduction initiator system is applied, the graphene oxide is used as a reducing agent, persulfate is used as an oxidant, and the cationic polyacrylamide emulsion is prepared by virtue of the aqueous dispersion polymerization method. The emulsion prepared by the method has the characteristics of instant solubility, high molecular weight, good mobility, good stability, no organic solvent in the polymerization process, environmental friendliness, nontoxicity, capability of adsorbing trace heavy metal ions and the like.

Description

technical field [0001] The invention relates to a cationic polyacrylamide emulsion, in particular to a method for preparing a cationic polyacrylamide emulsion by water dispersion polymerization; it belongs to the field of water-soluble polymers. Background technique [0002] Cationic polyacrylamide (CPAM) is a water-soluble polymer compound that can ionize positive ions in water. Because the CPAM aqueous solution itself has a positive charge, it mainly flocculates organic colloids or organic compounds with negative charges, and makes them coagulate and settle into larger flocs through the effects of electrical neutralization, adsorption and bridging. CPAM has multiple functions such as turbidity removal, decolorization, adsorption, and adhesion; it has the advantages of wide application range of pH, small amount of raw materials, slight toxicity, and convenient use. It is suitable for industries with high organic colloid content such as papermaking, food, and oil fields. It...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/56C08F220/34C08F226/02C08F4/40C08F2/16
CPCC02F1/285C02F2101/20C08F2/16C08F4/40C08F220/56C08F220/34C08F226/02
Inventor 彭晓宏周阜成彭双双
Owner 广东首信环保材料科技有限公司
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