Seed polymer and its stabilizer and method for preparing water-in-water cationic polyacrylamide copolymer dispersion using both

A polyacrylamide copolymer and polymer technology, which is applied in the field of preparation of cationic water-soluble polymer dispersions, can solve the problems that stabilizers cannot fully stabilize large particles, gels, poor storage performance, etc.

Active Publication Date: 2016-05-11
JIANGSU SOBUTE NEW MATERIALS +1
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0011] In order to solve the problem of poor fluidity in the preparation process of the existing polyacrylamide dispersion, the stabilizer cannot fully stabilize the large particles and the problems of easy gelation, especially the high viscosity in the synthesis process of the polyacrylamide dispersion with high solid content and low molar ionicity , poor fluidity lead to gel problems; and polyacrylamide dispersion products have high viscosity, poor fluidity, and poor storage performance, especially the storage problem of polyacrylamide dispersions with high solid content and high molar ionicity, because they cannot cope with the four seasons Fluctuations in temperature, temperature fluctuations will lead to large viscosity changes, resulting in the problem of poor storage stability; the invention provides a seed polymer for cationic polyacrylamide water-in-water dispersion liquid and its stabilizer and the dispersion liquid Preparation

Method used

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  • Seed polymer and its stabilizer and method for preparing water-in-water cationic polyacrylamide copolymer dispersion using both
  • Seed polymer and its stabilizer and method for preparing water-in-water cationic polyacrylamide copolymer dispersion using both
  • Seed polymer and its stabilizer and method for preparing water-in-water cationic polyacrylamide copolymer dispersion using both

Examples

Experimental program
Comparison scheme
Effect test

Embodiment A1

[0079] Example A1 (thermal decomposition initiator): The seed dispersion liquid with monomers dissolved in accordance with the dosage in Table 3 was passed through N under the condition of mechanical stirring at 30°C. 2 except O 2 30min, N 2 Under protective conditions, 2 parts of an aqueous solution containing 3.0‰ parts of VA044 were added at one time. From the beginning of the addition, the reaction was stirred for 30 hours, and the stirring and N was stopped. 2Protection and cooling can be used to obtain a milky white P(DMAM-co-DMC) water-in-water dispersion with a cationic degree of 0.2% and an effective solid content (synthetic cationic polyacrylamide, without stabilizers and seed polymers) of 15%. The reaction process The maximum viscosity of the medium is 311.0cP, the final product viscosity is 83.1cP (25℃), and the molecular weight is 8.7×10 6 , can be stored at room temperature (25 ℃) for more than one year (see Table 4 for relevant properties).

Embodiment A2

[0080] Example A2 (redox initiator): 4.8‰ parts of sodium metabisulfite (SMBS) was added to the monomer-dissolved seed dispersion prepared according to the dosage in Table 3 and dissolved by stirring at 35°C. Keep at 35°C and mechanically stir, pass N into it 2 except O 2 30min, N 2 Under protective conditions, 2 parts of an aqueous solution containing 4.8‰ parts of ammonium persulfate (APS) were evenly added dropwise, and the dripping time was controlled to be 15 min. Since the dropwise addition, the reaction was stirred for 30 h, and the stirring and N was stopped. 2 Protection and cooling can be used to obtain a milky white P(AM-co-DMC) water-in-water dispersion with a cationic degree of 2% and an effective solid content (synthetic cationic polyacrylamide, without stabilizers and seed polymers) of 20%. The reaction process The maximum viscosity of the medium is 594.4cP, the final product viscosity is 211.0cP (25℃), and the molecular weight is 12.9×10 6 , can be stored a...

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Abstract

The invention discloses a low-viscosity preparation method of cationic polyacrylamide copolymer water-in-water dispersion liquid. The key point of the method is as follows: a dispersion liquid of a seed polymer dissolved with monomers is prepared before synthesis of the dispersion liquid, and then the dispersion liquid is prepared through polymerization, wherein the seed polymer can be subjected to phase splitting in a salt solution to form micro particles namely 'seeds'. As the polymerization process takes seed internal polymerization as the primary from the beginning, the viscosity of the system in the whole polymerization process can be effectively reduced, and the storage stability of the formed water-in-water dispersion liquid can not be easily influenced by the temperature. The preparation method of the dispersion liquid is suitable for the industrial production of the water-in-water dispersion liquid, and is especially suitable for the preparation of the cationic polyacrylamide copolymer water-in-water dispersion liquid with low and high degree of ions.

Description

technical field [0001] The invention belongs to the technical field of preparation of cationic water-soluble polymer dispersions. Background technique [0002] Polyacrylamide's unique structural characteristics and complete product varieties make it widely used in various fields of the national economy, and enjoys the title of "Baiye Auxiliary". In my country, the application of polyacrylamide in the three major fields of petroleum, water treatment and papermaking is particularly important. [0003] The existing industrial production methods of ionic polyacrylamide copolymers include solution polymerization, inverse suspension polymerization and inverse emulsion polymerization. The product obtained by the solution polymerization production method is powder. Except for the high viscosity problem in the production process, it is similar to the reversed-phase suspension polymerization. Since the final drying and granulation are required, it is inevitable to introduce drying an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/56C08F220/34C08F220/54C08F120/56C08F120/34C08F2/16
Inventor 舒鑫黄振冉千平刘加平
Owner JIANGSU SOBUTE NEW MATERIALS
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