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 high viscosity of emulsion and inability to prepare high solid content, etc., and achieves high sizing efficiency, fast sizing and aging speed, and simple preparation process. Effect

Inactive Publication Date: 2011-01-12
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, this method also overcomes the disadvantages of large emulsion viscosity and the inability to prepare high-solid content AKD emulsion when the natural polymer polysaccharide emulsifies AKD alone, and significantly improves the sizing performance of the AKD emulsion sizing agent and the curing speed during sizing

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Two parts of chitosan with a deacetylation degree of 90.2% and a viscosity of 60 MPa·s were dissolved in 98 parts of dilute acetic acid solution containing 2 parts of acetic acid to obtain a chitosan solution; Nano-titanium dioxide powder was dispersed into 49 parts of deionized water to prepare nano-titanium dioxide sol. The above-mentioned chitosan solution was mixed with nano-titanium dioxide colloid, and after ultrasonic dispersion treatment for 5 min, it was heated to 75°C as the water phase for later use.

[0024] Weigh 50 parts of industrial AKD wax flakes, put them into the emulsifier, heat until it starts to melt, start the stirrer, control the rotation speed at about 200 r / min, and add the above-prepared water phase when the temperature rises to 75°C, Then increase the rotation speed to 10000 r / min, stir and emulsify for 3 minutes, and after cooling, obtain AKD emulsion type sizing agent with a solid content of about 26% and an average particle size of 1.5-2 μ...

Embodiment 2

[0027]Dissolve 1.5 parts of chitosan with a degree of deacetylation of 85% and a viscosity of 1000 MPa·s in 198 parts of dilute acetic acid solution containing 3 parts of acetic acid to obtain a chitosan solution; Nano-titanium dioxide powder was dispersed into 98 parts of deionized water to prepare nano-titanium dioxide sol. The above chitosan solution was mixed with nano-titanium dioxide colloid and dispersed in an emulsifying disperser for 2 min, then heated to 90°C as the water phase for later use.

[0028] Weigh 50 parts of industrial AKD wax flakes, put them into the emulsification container, heat until it starts to melt, start the stirrer, control the speed at about 50 r / min, and when the temperature rises to 55°C, add the prepared water phase, Then increase the rotation speed to 15000 r / min, stir and emulsify for 1 min, and obtain AKD emulsion sizing agent after cooling. The solid content of the sizing agent is about 15%, and the average particle size is 1.5-3 μm. The...

Embodiment 3

[0031] Dissolve 0.25 parts of chitosan with a deacetylation degree of 85% and a viscosity of 2500 MPa·s in 99 parts of dilute hydrochloric acid solution containing 1 part of hydrochloric acid to obtain a chitosan solution; another 1.5 parts of a synthetic chitosan with a primary particle size of about 25 nm Nano-titanium dioxide powder was dispersed into 59 parts of deionized water to prepare nano-titanium dioxide sol. The above chitosan solution was mixed with nano-titanium dioxide colloid and dispersed by an emulsifying disperser for 2 min, then heated to 55°C as the water phase for later use.

[0032] Weigh 50 parts of industrial AKD wax flakes, put them into the emulsification container, heat until it starts to melt, start the stirrer, control the speed at about 100 r / min, and when the temperature rises to 55°C, add the water phase prepared above, Then increase the rotation speed to 10000 r / min, stir and emulsify for 10 min, and obtain AKD emulsion type sizing agent after ...

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Abstract

The invention relates to a method for preparing an AKD emulsion sizing agent. The method comprises the following steps of: dissolving chitosan in diluted acid to form solution of chitosan; moisturizing and dispersing nanometer titanium dioxide particles with deionized water to prepare nanometer titanium dioxide colloid; uniformly mixing the solution of chitosan and the nanometer titanium dioxide colloid to obtain a mixture serving as an aqueous phase, and heating to over melting point of the AKD for later use; and heating the AKD until the AKD is melted, and mixing the AKD and the heated aqueous phase under stirring, increasing the stirring speed after mixing to ensure that the melted AKD is dispersed into small drops in the aqueous phase to obtain the AKD emulsion. The method has simple preparation process, small using amount of emulsion and no need of any surfactant or bactericide; and the prepared AKD emulsion has the advantages of high stability, high sizing efficiency and high sizing curing speed.

Description

technical field [0001] The invention relates to a preparation method of an AKD emulsion sizing agent, in particular to a method for preparing a high-efficiency AKD emulsion sizing agent by using nano titanium dioxide and chitosan as emulsifying and stabilizing agents. Background technique [0002] AKD is the abbreviation of alkyl ketene dimer, which is an unsaturated lactone. Under neutral / alkaline conditions, it reacts with the hydroxyl groups on the cellulose fibers and fixes them on the fibers, causing the hydrophobic groups in the AKD molecules to move toward Outward orientation, which imparts water resistance to the paper. However, the reaction between AKD and cellulose fiber is slow, and hydrolysis reaction will occur in the presence of water. Therefore, the sizing efficiency of AKD mainly depends on the competition between AKD and fiber and water. The curing speed depends on the reaction speed between AKD and fiber. AKD is solid at room temperature and insoluble in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H21/16
Inventor 刘温霞赵振环杨蕾丁鹏翔
Owner QILU UNIV OF TECH
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