Method for preparing AKD emulsion sizing agent

A sizing agent and emulsion technology, which is applied in the field of preparation of AKD emulsion sizing agent, can solve the problems of complex preparation process, low charge density, increased amount of fluorescent whitening agent, etc., and achieves simple preparation process, high sizing efficiency, Small droplet diameter effect

Inactive Publication Date: 2010-06-16
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The choice of emulsifier is the most critical factor for preparing high-quality AKD emulsion. Considering the adverse effects of conventional surfactants on AKD sizing, cationic starch (CS) and sodium lignosulfonate are generally used as emulsifiers for AKD at present. Cationic starch needs to be gelatinized and cooled before use, and its charge density is relatively low and its molecular weight is relatively large. Not only the preparation process is complicated, the dosage is large, but also the increase of the effective concentration of AKD emulsion is limited, and a large amount of fungicide is required. , the stability and sizing effect of AKD emulsion are also poor
The new AKD emulsion uses polyamine cationic resin as emulsifier, which improves the stability and sizing performance of the emulsion, but the problem is that it has a great influence on the fluorescent whitening agent, which greatly increases the amount of fluorescent whitening agent. Increase
In order to obtain a more stable AKD emulsion, this method needs to add the equivalent of 2.8% Al 2 o 3 Although the polymeric aluminum compound increases the stability of the emulsion, it still cannot effectively prevent the hydrolysis of AKD, and the amount of emulsifier is too high, about 15% of AKD
"China Papermaking" No. 2, 2009, page 60, reported a method for emulsifying AKD with styrene-acrylic polymers of soap-free emulsion polymerization. Although styrene-acrylic polymers can form a good interfacial film on the AKD interface, at least 18 % amount to get proper sizing efficiency and sizing effect of AKD emulsion

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Preparation of emulsifier: Disperse 5 parts of laponite in 245 parts of deionized water, and after standing for 48 hours, obtain 250 parts of laponite colloid; meanwhile, take 2.5 parts of n-propylamine and dissolve in 622.5 parts of deionized water to obtain 625 parts of n-propylamine Propylamine solution: add 625 parts of n-propylamine solution to the above 250 parts of laponite colloid and add 125 parts of deionized water, after mixing evenly, adjust the pH value of the solution to 6 with acetic acid, and heat to 55°C for later use.

[0025] Emulsification of AKD: Weigh 100 parts of commercial AKD with a melting point of 45-47°C, heat and melt, and keep the temperature at 50°C; add the preheated emulsifier prepared above into the melted AKD, and use a high-speed stirrer at 2000r / Stir and emulsify at min speed for 15 minutes. After cooling, a uniform milky white AKD emulsion is obtained, with a solid content of about 10% and an average particle size of the emulsion of...

Embodiment 2

[0028] Preparation of emulsifier: Disperse 3 parts of hectorite in 147 parts of deionized water, and after standing for 48 hours, obtain 150 parts of hectorite colloid; at the same time, take 0.3 parts of n-butylamine and dissolve it in 74.7 parts of deionized water to obtain 75 parts of N-butylamine solution: mix the above 150 parts of laponite colloid with 75 parts of n-butylamine solution, add 75 parts of water, adjust the pH value of the solution to 7 with concentrated hydrochloric acid, and heat to 75°C for later use.

[0029] Emulsification of AKD: Weigh 100 parts of commercial AKD with a melting point of 48-50°C, heat to melt and keep the temperature at 65°C, add the above-mentioned prepared and heated emulsifier into the melted AKD, and use a high-shear emulsifier at 11000r / Shear emulsification at min speed for 3 minutes, after cooling, a uniform and stable milky white AKD emulsion is obtained, the solid content is about 25%, the average particle size of the emulsion i...

Embodiment 3

[0032] Preparation of emulsifier: Disperse 1 part of hectorite in 99 parts of deionized water and leave it for 48 hours to obtain 100 parts of hectorite colloid; meanwhile take 0.01 part of n-pentylamine and dissolve it in 2.5 parts of deionized water to obtain 2.51 parts n-pentylamine solution: Take the above 100 parts of hectorite colloid, add 2.51 parts of n-pentylamine solution and mix evenly, add 97.5 parts of water, adjust the pH of the solution to 8 with 1M sulfuric acid, heat the emulsifier to 85°C for later use.

[0033]Emulsification of AKD: Weigh 100 parts of commercial AKD with a melting point of 48-50°C, heat and melt it to 75°C, then directly add it to the emulsifier prepared above, and use a shear emulsifier to emulsify at 15000r / min for 1 Minutes, after cooling, a uniform milky white AKD emulsion was obtained, with a solid content of about 33%, an average particle size of the emulsion of 3-5 μm, no change in the emulsion after centrifugation at 3000r / min for 10 ...

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Abstract

The invention discloses a method for preparing an AKD emulsion sizing agent, comprising the following steps of: wetting and dispersing hectorite nano particles by using deionized water, and putting for a certain time to prepare a hectorite colloid, and simultaneously, dissolving micromolecule amine in water to compound an aqueous solution; adding a micromolecule amine solution to the hectorite colloid and regulating the pH value of the colloid by using dilute acid; heating the colloid to the melting point of AKD for later use; and heating the AKD to melt down the AKD; and under the action of mechanical stirring, mixing the heated hectorite colloid with the molten AKD, and then emulsifying to obtain a stable AKD emulsion. The method has low use level of the emulsion and simple emulsifying process, and completely does not use the traditional surface active agents; and the sizing efficiency of the obtained emulsion can be greatly increased.

Description

technical field [0001] The invention relates to a method for preparing an AKD emulsion sizing agent, in particular to a method for preparing a stable AKD emulsion and using it as a papermaking sizing agent by combining inorganic nanoparticle hectorite and low-molecular amines as emulsifying and stabilizing agents. Background technique [0002] AKD is the abbreviation of alkyl ketene dimer. It is a waxy solid at room temperature and insoluble in water. It can be used as a sizing agent in papermaking after emulsification and dispersion to form an O / W emulsion. At the same time, AKD is a cellulose-reactive sizing agent, which can react with cellulose fibers to form ketoester derivatives under the heating conditions of the paper machine drying section, and locate on the fibers, and the hydrophobic end faces the surface of the fibers to form a hydrophobic Layer, with excellent water resistance, is a high-efficiency sizing agent. [0003] Since AKD has high reactivity and is easy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H21/16
Inventor 王慧丽鲁鹏刘温霞
Owner QILU UNIV OF TECH
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