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A cationic polymer graft modified nanocrystalline cellulose and its preparation method and application

A cationic polymer and nano-crystallization technology, which is applied in the direction of reinforcing agent addition, can solve the problems of increased white water concentration and ineffective adsorption of polymers, so as to improve physical strength, improve retention rate and system retention rate, and improve paper machine The effect of speed

Active Publication Date: 2018-01-09
赵迎辉
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Another disadvantage of these additives is the susceptibility to high conductivity and high content of anionic litter and colloidal substances
As a result, the polymer cannot be effectively adsorbed on the surface of fibers and fine fibers. Since the polymer adsorption is relatively poor under such white water conditions, a large part of the polymer will remain in the white water system and the concentration of white water will increase.

Method used

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  • A cationic polymer graft modified nanocrystalline cellulose and its preparation method and application
  • A cationic polymer graft modified nanocrystalline cellulose and its preparation method and application

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Experimental program
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Effect test

specific Embodiment 1

Appropriate amount

[0033] The preparation method comprises the following steps:

[0034] Add 900 g of soft water to a 2000 ml four-neck flask equipped with a turbine stirrer, RTD temperature sensor, reflux condenser and nitrogen inlet tube, add 225 g of nanocrystalline cellulose at a stirring speed of 120 RPM, and stir while stirring. Raise the temperature to 50°C, wait until it is completely dissolved, pass nitrogen gas and raise the temperature to 90°C, add 1.5 g of ethylenediaminetetraacetic acid (EDTA), 15 g of phosphoric acid, and 15 g of sodium hydroxide.

[0035] After stirring evenly, first add 5% ammonium persulfate aqueous solution at a constant flow rate (4 ml / min), and after 3 minutes, start adding acrylamide (50%) and dimethyldiallyl dropwise at a constant flow rate (10.8 ml / min) ammonium chloride (65%) monomer mixture, after 60 minutes of dripping, use 5% ammonium persulfate aqueous solution for 8 minutes.

[0036] Then keep warm at 85°C-105°C and react ...

specific Embodiment 2

Appropriate amount

[0038] The preparation method comprises the following steps:

[0039] Add 855 g of soft water to a 2000 ml four-neck flask equipped with a turbine stirrer, RTD temperature sensor, reflux condenser and nitrogen inlet tube, add 300 g of nanocrystalline cellulose at a stirring speed of 120 RPM, and stir while stirring. Raise the temperature to 50°C, wait until the solution is completely dissolved, blow nitrogen gas and raise the temperature to 90°C, add 1.5 g of EDTA-2Na, 15 g of phosphoric acid, and 15 g of sodium hydroxide.

[0040] After stirring evenly, first add 5% ammonium persulfate aqueous solution at a constant flow rate (4 ml / min). After 3 minutes, start to add N,N-dimethylacrylamide (50%) dropwise at a constant flow rate (9.8 ml / min). And dimethyl diallyl ammonium chloride (65%) monomer mixture solution, after 60 minutes of dripping, 5% ammonium persulfate aqueous solution for 8 minutes.

[0041] Then keep warm at 85°C-105°C and react for 1-...

specific Embodiment 3

[0042] The acrylamide in specific embodiment 1 is replaced by one selected from acrylamide, N,N-dimethylacrylamide, N,N-diethylacrylamide, N-vinylformamide, acrylonitrile A variety of nonionic monomers; the replacement of dimethyl diallyl ammonium chloride in specific embodiment 1 is the methyl chloride selected from dimethyl diallyl ammonium chloride, dimethylaminoethyl acrylate Quaternary ammonium salt, methyl chloride quaternary ammonium salt of dimethylaminoethyl methacrylate, methyl chloride quaternary ammonium salt of diethylaminoethyl methacrylate, methyl chloride quaternary ammonium salt of diethylaminoethyl methacrylate Ammonium salt, dimethylaminopropyl acrylamide methyl chloride quaternary ammonium, dimethylaminopropyl methacrylamide methyl chloride quaternary ammonium, dimethylaminoethyl acrylate benzyl chloride quaternary, Benzyl chloride quaternary ammonium salt of dimethylaminoethyl methacrylate, benzyl chloride quaternary ammonium salt of diethylaminoethyl meth...

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Abstract

The invention discloses a cationic polymer graft modified nanocrystalline cellulose, which comprises nanocrystalline cellulose, a nonionic monomer used to form a polymer carbon skeleton, and a cationic monomer used to introduce positive charges, and the The nanocrystalline cellulose, the nonionic monomer and the cationic monomer form nanocrystalline cellulose clusters through free radical initiated copolymerization; the nonionic monomer is selected from acrylamide, N,N-dimethylacrylamide , N,N-diethylacrylamide, N-vinylformamide, acrylonitrile, etc.; the cationic monomer is selected from the group consisting of dimethyl diallyl ammonium chloride, dimethylaminoethyl acrylate, diacrylate Ethylaminoethyl ester, methyl chloride quaternary ammonium salt of dimethylaminopropyl acrylamide, etc. The present invention also provides the application of cationic polymer grafted modified nanocrystalline cellulose as a papermaking auxiliary agent added to the wet end of a paper machine, thereby improving the dry strength, wet strength, and first pass retention of paper or cardboard to reduce white water concentration .

Description

technical field [0001] The invention relates to cationic polymer graft-modified nanocrystalline cellulose and its preparation method and application, and belongs to the technical field of polymer graft-modified industrial additives and its preparation and application. Background technique [0002] The paper industry is a chemical processing industry with fibers as raw materials. It is inseparable from the application of various chemicals in all stages of the process of pulping, bleaching, papermaking and post-processing of paper. They can not only endow paper with various special superior properties (such as water resistance, oil resistance, wet strength, dry strength, and cohesive strength properties, etc.), but also make it possible to produce paper with higher comprehensive performance using poor fiber raw materials ; And it can optimize the production process, increase the operating speed of the paper machine, and even greatly reduce environmental pollution, bringing goo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F251/02C08F220/56C08F226/02C08F220/54D21H21/18D21H17/45
Inventor 赵迎辉
Owner 赵迎辉
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