Method for preparing high-stabliliy ASA papermaking sizing agent emulsion

A high stability, emulsion technology, applied in the direction of adding water repellents, etc., can solve the problems of low concentration of ASA emulsion, large amount of particulate components added, etc., and achieve high sizing efficiency, small droplet diameter, and simple preparation process. Effect

Inactive Publication Date: 2010-11-03
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the adverse effects brought by surfactants cannot be completely avoided, and the amount of particle components added is too large, and the concentration of the prepared ASA emulsion is very low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Dissolve 0.01 part of chitosan with a deacetylation degree of 90.2% and a viscosity of 60 mPa·s in 2 parts of deionized water containing 0.02 part of acetic acid to obtain acid-soluble chitosan; prepare 3 parts of ammonia water containing 0.1 part of ammonia for later use.

[0024] Disperse 0.8 parts of montmorillonite obtained by purification of sodium bentonite modified by sodium citrate in 20 parts of water, stir at a stirring speed of 500 rpm for 30 minutes, add 20 parts of oily ASA, and stir at 12000 rpm Stir for 2 minutes at a stirring speed of 1 minute to obtain a stable ASA emulsion of montmorillonite; then add the acid-soluble chitosan prepared above at a stirring speed of 12000 rpm, and after stirring for 2 minutes, add the above-prepared Ammonia, continue to stir for 2 minutes to obtain milky white O / W type ASA emulsion, the mass percentage of ASA is about 44%, the pH value of the emulsion is about 7, the droplet diameter of the emulsion is 1~2μm, and the emul...

Embodiment 2

[0027] Dissolve 0.02 part of chitosan with a deacetylation degree of 90.2% and a viscosity of 60 mPa·s in 2 parts of deionized water containing 0.02 part of acetic acid to obtain acid-soluble chitosan; in addition, prepare 3 parts of ammonia water containing 0.1 part of ammonia. Disperse 0.8 parts of montmorillonite obtained by purification of sodium citrate-modified sodium bentonite in 15 parts of water, and stir for 1 minute at a stirring speed of 2000 rpm to obtain a montmorillonite suspension. Add the above-mentioned pre-prepared acid-soluble chitosan and ammonia water in sequence to the montmorillonite suspension, and stir at 2000 rpm for 1 minute respectively to obtain a montmorillonite suspension modified by chitosan deposition.

[0028] Weigh 20 parts of oily ASA, add the montmorillonite suspension modified by chitosan deposition prepared above, stir and emulsify for 10 minutes at a speed of 8000 rpm to obtain a milky white O / W type ASA emulsion, the emulsion The pH va...

Embodiment 3

[0031] Dissolve 0.025 parts of chitosan with a deacetylation degree of 86.7% and a viscosity of 60 mPa·s in 5 parts of deionized water containing 0.05 parts of acetic acid to obtain acid-soluble chitosan; and prepare 5 parts of ammonia water containing 0.2 parts of ammonia for later use.

[0032] Disperse 1.5 parts of montmorillonite obtained by purification of sodium bentonite modified by sodium fluoride in 30 parts of water, disperse for 1 minute at a stirring speed of 1000 rpm, add 20 parts of oily ASA, and stir at 10000 rpm Stir for 2 minutes at a stirring speed of 1 minute to obtain a stable ASA emulsion of montmorillonite; then add the acid-soluble chitosan prepared above at a stirring speed of 10000 rpm, and after stirring for 2 minutes, add the above prepared Ammonia, continue to stir for 2 minutes to obtain a milky white O / W type ASA emulsion, the mass percentage of ASA is about 33%, the pH value of the emulsion is about 7, the droplet diameter of the emulsion is about...

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Abstract

The invention relates to a method for preparing a high-stabliliy ASA papermaking sizing agent emulsion, which comprises the following steps that: smectite is dispersed in water to form a suspension; the suspension is mixed with oleosus ASA under the action of mechanical agitation to prepare a stable smectite ASA emulsion; and then a chitosan solution dissolved in dilute acid is added in the emulsion; and then a weak alkali is added to form the stable O / W type ASA emulsion under the action of the mechanical agitation. The method has the advantages that: the preparation process is simple; emulsifier dosage is less; surfactant addition is adovided; and the made ASA latices has high stability, short bubble diameter and high gluing efficiency.

Description

technical field [0001] The invention relates to a preparation method of a high-stability ASA papermaking sizing agent emulsion, in particular to a method of using natural polymers to adjust the relative wettability of montmorillonite particles to ASA and water, and to improve the ability of solid particles to ASA The emulsifying and stabilizing effect to prepare ASA emulsion with high stability and high sizing efficiency. Background technique [0002] ASA (alkenyl succinic anhydride) is a highly reactive neutral sizing agent for papermaking. It has the advantages of high sizing efficiency, fast curing rate, wide range of sizing pH value, and non-slip paper. It is widely used in advanced In-pulp sizing of paper and board, especially suitable for large-scale high-speed paper machines with in-machine coating, helps to improve sizing efficiency and reduce the amount of paper-making sizing agent. However, ASA is easy to be hydrolyzed, and hydrolysis not only reduces the sizing e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H21/16
Inventor 刘温霞于得海鲁鹏
Owner QILU UNIV OF TECH
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