Preparation method for modified cation retention and filter aid

A retention and drainage aid, cationic technology, applied in the direction of retention aid addition, etc., can solve the problems of restriction, solubility, fine fibers and poor retention of fillers, and achieve low equipment investment and production costs, and narrow molecular weight distribution , the effect of uniform molecular weight

Active Publication Date: 2014-05-28
ANHUI JUCHENG FINE CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The cationic polyacrylamide product produced by this process can only be used as a water treatment flocculant. Due to its poor solubility and retention of fine fibers and fillers in the adsorbed pulp, its application in the paper industry is limited.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) at 7m 3 In the batching tank, prepare 4m 3 A homogeneous solution containing 650kg acrylamide, 680kg acryloyloxyethyltrimethylammonium chloride (80% concentration), and 60kg carboxymethyl chitosan. Less than 4m 3 Make up part of the solution with water, mix the solution evenly, and adjust the pH=4.0 with 52kg oxalic acid. Add 28g of complexing agent pentasodium ethylenediamine tetramethylene phosphonate and 580g of antifoaming agent silicone oil, and fully mechanically stir until the solution is clear to obtain a homopolymer solution without solid insolubles.

[0020] (2) After cooling the homopolymer solution to 4.0-4.5°C, pump it into the polymerization kettle, add 600g of azobisisobutyronitrile, and feed high-purity nitrogen (purity 99.9%, flow rate 80 m 3 / h) for 30min, add the following solutions with a concentration of 5% in turn: sodium thiosulfate solution, the content of sodium thiosulfate is 220g, azodicarbonamide solution, the content of azodicarbonami...

Embodiment 2

[0023] (1) at 7m 3 In the batching tank, prepare 4m 3 The homogeneous solution, which contains 680kg acrylamide, 600kg acryloyloxyethyltrimethylammonium chloride (concentration is 80%), 60kg carboxymethyl chitosan solution. Less than 4m 3 Part of the solution was supplemented with water, and after the solution was mixed evenly, the pH was adjusted to 4.0 with 53kg of oxalic acid. Add 28g of complexing agent pentasodium ethylenediamine tetramethylene phosphonate and 580g of antifoaming agent silicone oil, and fully mechanically stir until the solution is clear to obtain a homopolymer solution without solid insolubles.

[0024] (2) After cooling the homopolymer solution to 4.0-4.5°C, pump it into the polymerization kettle, add 600g of azobisisobutyronitrile, and feed high-purity nitrogen (purity 99.9%, flow rate 80 m 3 / h) for 30min, add the following solutions with a concentration of 5% in turn: sodium thiosulfate solution, the content of sodium thiosulfate is 220g, azodicar...

Embodiment 3

[0027] (1) at 7m 3 In the batching tank, prepare 4m 3 The homogeneous solution, which contains 750kg acrylamide, 620kg acryloyloxyethyltrimethylammonium chloride (concentration is 80%), 65kg carboxymethyl chitosan solution. Less than 4m 3 Part of the solution was replenished with water, and after the solution was mixed evenly, the pH was adjusted to 3.8 with 60kg of oxalic acid. Add 28g of complexing agent pentasodium ethylenediamine tetramethylene phosphonate and 580g of antifoaming agent silicone oil, and fully mechanically stir until the solution is clear to obtain a homopolymer solution without solid insolubles.

[0028] (2) After cooling the homopolymer solution to 4.0-4.5°C, pump it into the polymerization kettle, add 600g of azobisisobutyronitrile, and feed high-purity nitrogen (purity 99.9%, flow rate 80 m 3 / h) for 30min, add the following solutions with a concentration of 5% in turn: sodium thiosulfate solution, the content of sodium thiosulfate is 220g, azodicarb...

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Abstract

The invention discloses a preparation method for a modified cation retention and filter aid, which comprises the following steps raw materials are mixed uniformly to obtain a homogeneous solution; a complexing agent and a defoaming agent are added sequentially; sufficient stirring is performed until the solution is clear; the pH value is adjusted via weak acid to obtain a homopolymerization solution; the homopolymerization solution is cooled and then pumped into a polymerization kettle; azodiisobutyronitrile is added; high-purity nitrogen is introduced; the solutions prepared by the raw materials are added sequentially; after the solutions are added fully, high-purity nitrogen is introduced continuously; then feeding is stopped; the temperature is controlled for polymerization reaction; aging reaction is performed for 4 h; a transparent elastic rubber block is obtained; the rubber block is taken out, cut, granulated, dried, smashed and sieved to obtain white powdery cation polyacrylamide According to the method, the obtained modified cation polyacrylamide can be widely applied to a paper technology, improve the dehydration property of pulp, increase retention rates of a fine fiber and a filler, and reduce consumption of the raw materials and environment pollution.

Description

[0001] technical field [0002] The invention relates to a preparation method of a modified cationic retention and drainage aid, which belongs to the field of papermaking water-soluble polymer synthesis. Background technique [0003] Cationic polymer flocculant P (DAC-AM) is a copolymer of cationic monomer acryloyloxyethyltrimethylammonium chloride (DAC) and acrylamide (AM). It is a linear polymer with cationic charge, which has the characteristics of high charge density and good water solubility. At present, the retention and dehydration aids for papermaking are generally emulsion products, and the products are inconvenient to transport, have short storage time and high prices. Factors increase the production cost of paper. On the other hand, the preparation method of solid cationic polyacrylamide is generally a redox reaction system initiated polymerization process. In this process, the cationic monomer and acrylamide are mixed in proportion and then added to the redox ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F251/00C08F220/34C08F220/56C08F4/04C08F4/40D21H21/10
Inventor 徐强王林王正合颛孙曼曼刘庆
Owner ANHUI JUCHENG FINE CHEM
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