Preparation method of water-soluble polymer dispersion

Abstract

The invention relates to a preparation method of a water-soluble polymer dispersion. The water-soluble monomer is dispersed in a solution polymerization system containing a dispersant, an initiator and a metal ion scavenger to perform polymerization and obtain the water-soluble polymer dispersion, wherein the dispersant is a composite dispersant system and contains at least one kind of water-insoluble inorganic macroparticles and at least one water-soluble polymer dispersant. The invention utilizes the composite dispersant system in which the water-insoluble inorganic macroparticles are matched with the polymer dispersant to form dispersion coating mechanism so as to reduce the concentration of high molecular polymer in continuous phase and ensure that the rolling friction and rigid impact are mainly adopted between the polymer molecule chain and the macroparticles. Therefore, the viscosity of the dispersion is effectively reduced while the molecular weight of polyacrylamide polymer in the dispersion is not reduced, and the water-soluble polymer dispersion with high concentration, good solubility, uniform dispersion, high efficiency and full water-solubility can be prepared.

Description

Technical field:

[0001] The invention relates to a method for preparing a water-soluble polymer dispersion, which is to prepare an oil-free water-based multiphase polymer dispersion, such as preparing a polyacrylamide aqueous dispersion, which can be used as a papermaking retention aid Filtering agent, paper sizing agent, paper strengthening agent, water treatment flocculant and coagulant, thickener, drag reducer, etc. Background technique:

[0002] Water-soluble polymers are widely used as flocculants for solid-liquid separation, as well as many processes with flocculation as the core mechanism. Among them, ionic polyacrylamide is the most widely used flocculant. Common polyacrylamide synthetic products include two types, solid powder or emulsion liquid products. Solid polyacrylamide products are generally prepared by reverse suspension polymerization. The product packaging and transportation are convenient, but there is a problem of difficulty in dissolution during use. ...

Examples

Embodiment 1

[0055] Example 1: In this example, a relatively high molecular weight polymer dispersant is prepared by polymerization of monomers.

[0056] 560 grams of 50% by weight of trimethyl(meth)acrylamidopropylammonium chloride monomer solution, 7 grams of 2% by weight of EDTA disodium salt solution, and 124.6 grams of water were added to 1000 milliliters of four In the reactor, the four ports of the reactor are mechanical stirring, nitrogen inlet, thermometer, and feeding port. After the reaction system was preheated to 50 degrees Celsius and replaced with nitrogen to remove oxygen for 30 minutes, 8.4 ml of 10% by weight AIBA solution was added by injection. After reacting for 6 hours, the temperature of the system was raised to 90°C. The reaction was continued for 2 hours to stop the reaction, and the system was cooled to room temperature to obtain a polytrimethyl(meth)acrylamidopropyl ammonium chloride dispersant product. The determined molecular weight of the product is 117,000....

Embodiment 2

[0057] Example 2: In this example, a relatively low molecular weight polymer dispersant is prepared by polymerization of monomers.

[0058] Add 7 grams of 2% by weight EDTA disodium salt solution and 342 grams of water into a 1000 ml four-port reactor. The four ports of the reactor are mechanical stirring, nitrogen inlet, thermometer, and feeding port. After the reaction system was preheated to 50 degrees Celsius and replaced with nitrogen to remove oxygen for 30 minutes, 28 ml of 30% by weight APS solution was added by injection. Then, 323 grams of 65% by weight diallyldimethylammonium chloride monomer solution was added dropwise into the reactor, and the addition of the monomer was controlled to end within 4 hours. After reacting for 6 hours, the temperature of the system was raised to 90°C. The reaction was continued for 2 hours to stop the reaction, and the system was cooled to room temperature to obtain a polydiallyldimethylammonium chloride dispersant product. The dete...

Embodiment 3

[0060] With 70 grams of solid dispersant calcium carbonate (heavy calcium carbonate, fineness is 2500 orders), 0.378 grams of ammonium persulfate, 280 grams of 45% by weight polydiallyl dimethyl ammonium chloride dispersant aqueous solution (by the embodiment 1 method preparation), 157 grams of 40% by weight of acrylamide aqueous solution, 78 grams of 80% by weight of acryloyloxyethyltrimethylammonium chloride aqueous solution, 104 grams of deionized water and 7 grams of 2% by weight of ethylenediaminetetra Aqueous solution of disodium acetate salt was sequentially added into a 1000 ml four-port reactor, and the four ports of the reactor were mechanical stirring, nitrogen gas inlet, thermometer, and feeding port. After the reaction system was preheated to 30 degrees Celsius and replaced with nitrogen to remove oxygen for 30 minutes, 1.57 ml of 10% by weight sodium bisulfite was added by injection. The temperature of the system rises rapidly after a few minutes, and the viscosi...

Technical field:

[0001] The invention relates to a method for preparing a water-soluble polymer dispersion, which is to prepare an oil-free water-based multiphase polymer dispersion, such as preparing a polyacrylamide aqueous dispersion, which can be used as a papermaking retention aid Filtering agent, paper sizing agent, paper strengthening agent, water treatment flocculant and coagulant, thickener, drag reducer, etc. Background technique:

[0002] Water-soluble polymers are widely used as flocculants for solid-liquid separation, as well as many processes with flocculation as the core mechanism. Among them, ionic polyacrylamide is the most widely used flocculant. Common polyacrylamide synthetic products include two types, solid powder or emulsion liquid products. Solid polyacrylamide products are generally prepared by reverse suspension polymerization. The product packaging and transportation are convenient, but there is a problem of difficulty in dissolution during use. ...

Examples

Embodiment 1

[0055] Example 1: In this example, a relatively high molecular weight polymer dispersant is prepared by polymerization of monomers.

[0056] 560 grams of 50% by weight of trimethyl(meth)acrylamidopropylammonium chloride monomer solution, 7 grams of 2% by weight of EDTA disodium salt solution, and 124.6 grams of water were added to 1000 milliliters of four In the reactor, the four ports of the reactor are mechanical stirring, nitrogen inlet, thermometer, and feeding port. After the reaction system was preheated to 50 degrees Celsius and replaced with nitrogen to remove oxygen for 30 minutes, 8.4 ml of 10% by weight AIBA solution was added by injection. After reacting for 6 hours, the temperature of the system was raised to 90°C. The reaction was continued for 2 hours to stop the reaction, and the system was cooled to room temperature to obtain a polytrimethyl(meth)acrylamidopropyl ammonium chloride dispersant product. The determined molecular weight of the product is 117,000....

Embodiment 2

[0057] Example 2: In this example, a relatively low molecular weight polymer dispersant is prepared by polymerization of monomers.

[0058] Add 7 grams of 2% by weight EDTA disodium salt solution and 342 grams of water into a 1000 ml four-port reactor. The four ports of the reactor are mechanical stirring, nitrogen inlet, thermometer, and feeding port. After the reaction system was preheated to 50 degrees Celsius and replaced with nitrogen to remove oxygen for 30 minutes, 28 ml of 30% by weight APS solution was added by injection. Then, 323 grams of 65% by weight diallyldimethylammonium chloride monomer solution was added dropwise into the reactor, and the addition of the monomer was controlled to end within 4 hours. After reacting for 6 hours, the temperature of the system was raised to 90°C. The reaction was continued for 2 hours to stop the reaction, and the system was cooled to room temperature to obtain a polydiallyldimethylammonium chloride dispersant product. The dete...

Embodiment 3

[0060] With 70 grams of solid dispersant calcium carbonate (heavy calcium carbonate, fineness is 2500 orders), 0.378 grams of ammonium persulfate, 280 grams of 45% by weight polydiallyl dimethyl ammonium chloride dispersant aqueous solution (by the embodiment 1 method preparation), 157 grams of 40% by weight of acrylamide aqueous solution, 78 grams of 80% by weight of acryloyloxyethyltrimethylammonium chloride aqueous solution, 104 grams of deionized water and 7 grams of 2% by weight of ethylenediaminetetra Aqueous solution of disodium acetate salt was sequentially added into a 1000 ml four-port reactor, and the four ports of the reactor were mechanical stirring, nitrogen gas inlet, thermometer, and feeding port. After the reaction system was preheated to 30 degrees Celsius and replaced with nitrogen to remove oxygen for 30 minutes, 1.57 ml of 10% by weight sodium bisulfite was added by injection. The temperature of the system rises rapidly after a few minutes, and the viscosi...

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