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Preparation method and paper pulp retention aiding application of bead-like cationic polyacrylamide retention aid

A technology of polyacrylamide and cation, which is applied in the direction of retention aid addition, paper, papermaking, etc., can solve the problems of unfavorable papermaking process efficiency, improvement, long dissolution time, etc., achieve good pulp drainage performance, improve coordination effect, and good The effect of dissolution efficiency

Active Publication Date: 2019-02-01
ZHEJIANG XINYONG BIOCHEM
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, all kinds of PAM products used as retention aids in papermaking are mostly in the form of powder, which is prone to deliquescence and agglomeration during storage. At the same time, powdery PAM is prone to dust pollution during use, which is not conducive to environmental protection; In the process of adding powdery PAM, it is very easy to agglomerate when it encounters water, and the dissolution time is long, generally more than 1 hour, which greatly limits the use efficiency of PAM in water, which is not conducive to the improvement of the efficiency of the papermaking process

Method used

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  • Preparation method and paper pulp retention aiding application of bead-like cationic polyacrylamide retention aid

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Embodiment 1

[0033] Embodiment 1, preparation of beaded cationic polyacrylamide retention aid

[0034] Water phase preparation: Weigh 14.5g of acrylamide (AM), 4.5g of cationic monomer acryloyloxyethyltrimethylammonium chloride (DAC) and dissolve them in 50ml of deionized water at 40-45°C to form a transparent single aqueous solution, then add 0.015g initiator V-50 and ammonium persulfate (weight ratio is 1: 1), mix well, and prepare the aqueous phase;

[0035] Oil phase preparation: Weigh 0.80g emulsifier Span-60, 0.80g emulsifier span-80, 0.20g initiator V60 azobisisobutyronitrile and put them into a 500mL four-phase tank equipped with a mechanical stirrer, a condenser tube and a nitrogen conduit. Add 200mL cyclohexane to a round-bottomed flask, pass through condensed water, start stirring, and raise the temperature to 45°C until the emulsifier and initiator are completely dissolved to form a transparent oil phase;

[0036] Polymerization reaction: The two systems (water phase and oil p...

Embodiment 2

[0038] Embodiment 2, the preparation of beaded polyacrylamide retention aid

[0039] Except that the consumption of the initiator of the aqueous phase preparation step is changed into V-50 and ammonium persulfate meter 0.03g (weight ratio is 1: 1), other conditions are identical with embodiment 1, obtain diameter 1.0 ± 0.2mm bead-shaped retention aid Poly(AM-DAC), the solid content is 90%.

Embodiment 3

[0040] Embodiment 3, the preparation of beaded polyacrylamide retention aid

[0041] Except that the initiator of the aqueous phase preparation step is changed into VA044 and ammonium persulfate meter 0.03g (weight ratio is 1: 1), other conditions are the same as Example 1, obtain diameter 1.1 ± 0.2mm pearl shape retention aid Poly(AM- DAC) with a solid content of 91%.

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Abstract

The invention relates to a preparation method and a paper pulp retention aiding application of a bead-like cationic polyacrylamide retention aid. An inverse emulsion polymerization process is used, and a reaction micro-environment chamber in the acrylamide polymerization process is accurately regulated to effectively regulate the molecular weight and the polymerization mode of acrylamide in orderto control the physical form of the PAM product and obtain the easily-dispersed bead-like PAM product having a diameter of 0.8-1.5 mm. The bead-like PAM avoids the x agglomeration phenomenon in water,so the dissolving rate of the bead-like PAM in water is greatly increased, and the dust pollution caused by powdery PAM is solved, thereby the addition process is simplified, the requirements for devices are reduced, the production cost is reduced, and the large-scale commercial application is benefited.

Description

technical field [0001] The invention relates to a preparation method of a bead-shaped cationic polyacrylamide retention aid and its retention aid application to pulp slurry, and the application belongs to the field of preparation of water-soluble polymer compounds. Background technique [0002] In the field of papermaking, retention aids improve the retention rate of fine fibers and fillers by changing the flocculation state of papermaking pulp, so as to achieve the results of reducing the loss of fibers and fillers and reducing the pollution load. With the high speed of papermaking technology and higher requirements for product quality, new high-efficiency retention systems and technologies must be used to ensure the rapid development of the papermaking industry. Among them, polyacrylamide (PAM) of different ionic types and its graft copolymerization products are currently one of the representative paper retention aids. [0003] PAM is a water-soluble organic polymer compo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F220/34D21H17/45D21H21/10
CPCC08F220/56D21H17/455D21H21/10C08F220/34
Inventor 肖勋文张虎寅周仲英顾宏军袁峥珲吴乐先王乐佳
Owner ZHEJIANG XINYONG BIOCHEM
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