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Seed polymer for water-in-water cationic polyacrylamide copolymer dispersion liquid and stabilizer of seed polymer as well as preparation method of dispersion liquid

A technology of polyacrylamide copolymer and polymer, which is applied in the field of preparation of cationic water-soluble polymer dispersion, and can solve problems such as gel, stabilizer cannot fully stabilize large particles, and easy gel

Active Publication Date: 2014-06-11
JIANGSU SOBUTE NEW MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 for water-in-water cationic polyacrylamide copolymer dispersion liquid and stabilizer of seed polymer as well as preparation method of dispersion liquid
  • Seed polymer for water-in-water cationic polyacrylamide copolymer dispersion liquid and stabilizer of seed polymer as well as preparation method of dispersion liquid
  • Seed polymer for water-in-water cationic polyacrylamide copolymer dispersion liquid and stabilizer of seed polymer as well as preparation method of dispersion liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment A1

[0079] Example A1 (thermal decomposition initiator): The seed dispersion prepared in accordance with the dosage in Table 3 and dissolved in monomers was passed through N under the condition of mechanical stirring at 30°C. 2 Divide O 2 30min, N 2Under protective conditions, add 2 parts of aqueous solution containing 3.0‰ parts of VA044 at one time. Since the addition, the reaction is stirred for 30h, and the stirring is stopped and N 2 Protection and cooling can produce 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 medium maximum viscosity is 311.0cP, the final product viscosity is 83.1cP (25°C), and the molecular weight is 8.7×10 6 , can be stored at room temperature (25°C) for more than one year (see Table 4 for relevant properties).

Embodiment A2

[0080] Example A2 (redox initiator): Add 4.8‰ parts of sodium metabisulfite (SMBS) to the monomer-dissolved seed dispersion prepared according to the dosage in Table 3, and stir to dissolve at 35°C. Maintain 35°C and mechanical stirring, pass N into it 2 Divide O 2 30min, N 2 Under protective conditions, 2 parts of an aqueous solution containing 4.8‰ parts of ammonium persulfate (APS) were uniformly added dropwise thereto, and the dropping time was controlled to be 15 minutes. Since the dropwise addition, the reaction was stirred for 30h, and the stirring and N 2 Protection, lowering the temperature can produce 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 medium maximum viscosity is 594.4cP, the final product viscosity is 211.0cP (25°C), and the molecular weight is 12.9×10 6 , can be stored at room t...

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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 "Hundred Industry Auxiliaries". In my country, the application of polyacrylamide in the three major fields of petroleum, water treatment and papermaking is particularly important. [0003] The current 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 a powder. Except for the high viscosity problem in the production process, it is similar to the reverse phase suspension polymerization. Since drying and granulation is required in the end, it is inevitable to introd...

Claims

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Application Information

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Patent Type & Authority Applications(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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