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Preparation method and application of cross-linked polyacrylamide with high molecular weight and narrow distribution

A polyacrylamide, high molecular weight technology, applied in the addition of retention aids, reinforcing agents, paper, etc., can solve the problems of inability to obtain effective strength improvement, increase of flocculant dosage, gelation and foamability, etc. Concentration of active ingredients, fewer operational disturbances, and fewer gels

Active Publication Date: 2014-05-07
HANGZHOU HANGHUA HARIMA PAPER CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] But the amphoteric polyacrylamide of cross-linking polymerization in these inventions does not all mention the problem about product molecular weight, perhaps mentions molecular weight but does not mention the problem of molecular weight distribution, in practical application, except the influence of molecular weight, the molecular weight Distribution is also an important factor, especially when used as a paper-making strengthening agent. Although high molecular weight can increase the volume of molecular clusters to obtain better fiber fixation effects, if the distribution is too wide, products with small molecules will not be able to The effective strength is improved, and the ultra-high molecular weight part will bring a series of problems such as gel and foaming. Similarly, in sewage treatment, the more components in the ultra-high molecular weight and ultra-low molecular weight parts, the more effective flocculation The reduction of the material will lead to a series of problems such as the increase of the amount of flocculant

Method used

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  • Preparation method and application of cross-linked polyacrylamide with high molecular weight and narrow distribution
  • Preparation method and application of cross-linked polyacrylamide with high molecular weight and narrow distribution
  • Preparation method and application of cross-linked polyacrylamide with high molecular weight and narrow distribution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Add primary monomers to a 1000ml four-necked flask equipped with a stirrer, thermometer, reflux condenser, feeding port and nitrogen conduit: 72.8 parts of acrylamide, 2.1 parts of dimethylaminoethyl methacrylate, methacryloyloxyethyl 1.4 parts of trimethyl ammonium chloride, 2.1 parts of N,N-dimethylaminopropyl acrylamide, 1 part of acrylic acid, 0.13 parts of 2,4-diphenyl-4-methylpentene, allylsulfonic acid 0.23 parts of sodium, 0.25 parts of sodium methallyl sulfonate, 0.16 parts of dimethylacrylamide, and 53.3 parts of deionized water are prepared into a primary monomer solution with a concentration of 27.1%, and the pH is adjusted to 2.8, blow nitrogen into the reaction vessel for more than 30 minutes, and heat it to a temperature of 65°C, then add 0.06 part of catalyst ammonium persulfate once into the reaction vessel to initiate the reaction. During the addition process, the temperature of the polymerization reaction was controlled at 65° C., and after the additi...

Embodiment 2～8

[0057] According to the preparation method of the example, the types and proportions of materials were changed, and various process parameters were adjusted to prepare a kind of high molecular weight narrow distribution cross-linked polyacrylamide A2-A8. The material proportions are listed in Table 1, and the preparation process conditions And the final product indicators are shown in Table 2.

[0058] Table 1, Experimental Examples 1-8 Ratio of materials (parts by weight)

[0059]

[0060] Symbol Description:

[0061] AM acrylamide, AAM methacrylamide, SDAM methacryloyloxyethyltrimethylbenzyl chloride DAM dimethylaminoethyl methacrylate, DMC methacryloyloxyethyltrimethylammonium chloride DMAPAA N,N-dimethylaminopropylacrylamide, IA itaconic acid, FA fumaric acid, AA acrylic acid DMP 2,4-diphenyl-4-methylpentene, ALS sodium allyl sulfonate, SMS formazan Sodium allyl sulfonate, VT vinyl toluene, MBA methylene bisacrylamide, SMC dimethyl acrylamide.

[0062] Table 2, Exper...

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PUM

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Abstract

The invention relates to the field of papermaking and paper chemicals, aims to solve the problem that a paper used polyacrylamide dry strength additive, which has an efficient enhancement effect, and is good in adhesiveness, and environmentally friendly, is required to be prepared in the papermaking industry at present, and provides a preparation method of cross-linked polyacrylamide with high molecular weight and narrow distribution and application of the cross-linked polyacrylamide to papermaking. The cross-linked polyacrylamide prepared with the preparation method has higher weight-average molecular weight and narrower molecular distribution, and has the advantages of good enhancement effect, low loss of white water, good adhesiveness, less jello, environmental protection and the like. When the cross-linked polyacrylamide is applied to various fields, actual effective constituents are concentrated better, the operating barrier is reduced, and fewer side effects are caused.

Description

technical field [0001] The invention relates to the field of papermaking and papermaking chemicals, in particular to a high molecular weight narrow distribution crosslinked polyacrylamide and its preparation method and application. Background technique [0002] In the field of papermaking, the most common reinforcing agents include natural polymers, such as starch, guar gum, cellulose, etc., and synthetic polymers, such as polyvinyl alcohol, polyacrylamide, polyethyleneimine, etc. Starch is due to its The wide range of resources, cheap price and other advantages have long been used as the main enhancer for paper copying. In recent years, as a countermeasure for energy saving, emission reduction and environmental protection, papermaking enterprises have gradually promoted clean papermaking, resulting in a closed cycle of white water and serious accumulation of garbage and impurities in the system. enhanced. Therefore, in recent years, the polymer polymerization enhancer mai...

Claims

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Application Information

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IPC IPC(8): C08F220/56C08F222/02C08F220/06C08F220/22C08F220/34C08F220/60C08F2/38D21H17/55D21H21/18D21H21/10C02F1/56
Inventor 吕建平吕英杰李相福田敦之汪曾祁
Owner HANGZHOU HANGHUA HARIMA PAPER CHEM
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