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Method for preparing papermaking sizing emulsion based on cationic Janus particles

A cationic, sizing emulsion technology, which is applied in papermaking, textiles, papermaking, paper coatings, etc., can solve the problems of high cost, difficult synthesis, and inability to realize industrial scale production, so as to improve utilization rate, avoid negative impact, and simple The effect of efficient preparation

Active Publication Date: 2019-07-05
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, Janus materials in the early stages are difficult to synthesize and expensive to achieve industrial scale production.

Method used

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  • Method for preparing papermaking sizing emulsion based on cationic Janus particles
  • Method for preparing papermaking sizing emulsion based on cationic Janus particles
  • Method for preparing papermaking sizing emulsion based on cationic Janus particles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Mix 5g of cationic starch with 200g of deionized water and stir evenly. Raise the reaction temperature to 85°C and keep stirring for 30 minutes. Continue stirring for 10 minutes after butyl acrylate, adjust the reaction temperature to 75° C., add 0.5 g of ammonium persulfate, and keep the reaction for 2 hours to obtain a seed emulsion stabilized by cationic starch.

[0034] Add 20g of methacryloyloxyethyltrimethylammonium chloride to the cationic starch-stabilized seed emulsion and stir thoroughly, add 0.25g of 2,2'-azobisisobutylamidine hydrochloride, and keep warm for 4 Hours, the cationic Janus particle emulsion was obtained. Take 4g of cationic Janus particle emulsion, add 100g of deionized water, adjust the pH of the dispersion to 7.5, add 110g of alkenyl succinic anhydride, and mix thoroughly to obtain a papermaking sizing emulsion with stable cationic Janus particles.

Embodiment 2

[0036]Mix 10g of starch dextrin and 300g of deionized water and stir evenly. Raise the reaction temperature to 80°C and keep stirring for 60 minutes. ester, 15g ethyl acrylate, and 5g acrylic acid, and then continue to stir for 20 minutes. After adjusting the reaction temperature to 40°C, add 0.25g potassium persulfate and 0.1g sodium bisulfite, and keep warm for 4 hours to obtain starch dextrin-stabilized Seed lotion.

[0037] Add 10g of diallyldimethylammonium chloride to the starch dextrin-stabilized seed emulsion and stir thoroughly, add 0.17g of 2,2'-azobisisobutylamidine hydrochloride, and keep warm for 6 hours to obtain Cationic Janus particle emulsion. Take 10g of cationic Janus particle emulsion, add 120g of deionized water, adjust the pH of the dispersion to 7, add 300g of alkyl ketene dimer, and mix thoroughly to obtain a papermaking sizing emulsion with stable cationic Janus particles.

Embodiment 3

[0039] Mix 15g of enzymatic starch with 400g of deionized water and stir evenly. Raise the reaction temperature to 70°C and keep stirring for 40 minutes. After the enzymatic starch is gelatinized, nitrogen gas is introduced, and 50g of methyl acrylate, 25g of butyl After 25g of isooctyl acrylate, continue to stir for 30 minutes, adjust the reaction temperature to 50°C, add 0.5g of dicumyl peroxide and 0.5g of sodium thiosulfate, and keep the temperature for 4 hours to obtain seeds stabilized by enzymatic starch lotion.

[0040] Add 50g of diallyldimethylammonium chloride to the seed emulsion stabilized by enzymatic starch and stir thoroughly, add 0.7g of 2,2'-azobisisobutylamidine hydrochloride, and keep it warm for 12 hours to obtain Cationic Janus particle emulsion. Take 50g of cationic Janus particle emulsion, add 900g of deionized water, adjust the pH value of the dispersion to 8, add 1000g of alkyl ketene dimer, 50g of rosin, and mix thoroughly to obtain paper sizing wit...

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Abstract

The invention discloses a method for preparing a papermaking sizing emulsion based on cationic Janus particles, and belongs to the technical field of papermaking sizing. The method can solve the problems that emulsification effects of a sizing emulsion prepared by using cationic starch, Pickering granules and the like are not good. The preparation method comprises the following steps: firstly preparing a starch-stabilized seed emulsion, adding a cationic monomer and a cationic initiator to prepare the cationic Janus particles, mixing the cationic Janus particles and a sizing agent, and performing full emulsification to obtain the papermaking sizing emulsion. When the preparation method of the sizing emulsion provided by the invention is used for the papermaking sizing, stability and the sizing effects can be improved, and the cationic Janus particles can be adsorbed on the surface of negatively-charged fibers to improve a utilization rate of the Janus particles; and compared with the sizing emulsion prepared by adopting the cationic starch or the Pickering granules, the sizing emulsion provided by the invention has obviously-improved sizing efficiency.

Description

technical field [0001] The invention belongs to a method for preparing paper-making sizing emulsion, in particular to a method for preparing paper-making sizing emulsion based on cationic Janus particles. Background technique [0002] Surface sizing technology is an important method to improve the performance of paper and paperboard, which can effectively improve the surface performance and physical properties of paper sheets. At present, the sizing agents used by domestic papermaking enterprises mainly include alkenyl succinic anhydride, alkyl ketene dimer, paraffin wax, rosin, etc. Since the sizing agent itself is insoluble in water, it must be emulsified before it can be evenly dispersed in the sizing process. Therefore, emulsification technology has become an important factor affecting the sizing effect and paper performance; on the other hand, due to the sizing agent itself It has no charge, and it is difficult to retain the sizing agent on the fiber when it is used al...

Claims

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Application Information

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IPC IPC(8): C08J3/03C08F251/00C08F220/18C08F220/34C08F220/14C08F226/02C08F4/04D21H19/54
CPCC08J3/03C08F251/00C08F4/04D21H19/54C08J2351/02C08F220/18
Inventor 成世杰王洪振陈晨
Owner QINGDAO UNIV OF SCI & TECH
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