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A kind of modified hydrotalcite stabilized AKD emulsion sizing agent and preparation method thereof

A technology for modifying water and hydrotalcite, applied in the direction of adding water repellent, can solve the problem of not being able to obtain AKD emulsion, and achieve the effects of good dispersibility, good sizing effect and fast curing speed

Inactive Publication Date: 2016-03-23
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, no matter whether hydrotalcite and bentonite are used as emulsifiers or hydrotalcite alone is used as emulsifier, AKD emulsion cannot be obtained

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Weigh 1 part of alanine and 1 part of sodium hydroxide and dissolve it in 25 parts of deionized water; weigh 15 parts of magnesium nitrate hexahydrate and 10 parts of aluminum nitrate nonahydrate and dissolve it in 50 parts of deionized water. Under vigorous stirring, the above two solutions were added dropwise into the reaction kettle at 80°C at the same time, and the pH value was kept at about 10. After the dropwise addition, keep the temperature for aging for 24 hours. The product was filtered and washed to obtain a magnesium aluminum hydroxide hydrotalcite sol with a solid content of 16.7% intercalated in situ with alanine.

[0051] Weigh 1.50 parts of hydrotalcite sol synthesized above and dilute to 25 parts with deionized water to form a modified hydrotalcite dispersion; in addition, dissolve 0.025 parts of polyethyleneimine in 150 parts of deionized water . Mix the above polyethyleneimine aqueous solution with the modified hydrotalcite dispersion, and disperse ...

Embodiment 2

[0055] Weigh 1.5 parts of lysine and 1 part of sodium hydroxide and dissolve them in 25 parts of deionized water; weigh 15 parts of magnesium nitrate hexahydrate and 10 parts of aluminum nitrate nonahydrate and dissolve them in 50 parts of deionized water. Under vigorous stirring, the above two solutions were added dropwise into the reaction kettle at 80°C at the same time, and the pH value was kept at about 10. After the dropwise addition, keep the temperature for aging for 24 hours. The product was filtered and washed to obtain magnesium aluminum hydroxide hydrotalcite sol with a solid content of 15.2% in situ intercalation of lysine.

[0056] Weigh 3.3 parts of hydrotalcite sol synthesized above and dilute to 100 parts with deionized water to form a modified hydrotalcite dispersion; in addition, dissolve 0.25 parts of polyethyleneimine in 125 parts of deionized water . Mix the above polyethyleneimine aqueous solution with the modified hydrotalcite dispersion, and disperse...

Embodiment 3

[0060] Weigh 1.5 parts of lysine and 1 part of sodium hydroxide and dissolve them in 25 parts of deionized water; weigh 15 parts of magnesium nitrate hexahydrate and 10 parts of aluminum nitrate nonahydrate and dissolve them in 50 parts of deionized water. Under vigorous stirring, the above two solutions were added dropwise into the reaction kettle at 80°C at the same time, and the pH value was kept at about 10. After the dropwise addition, keep the temperature for aging for 24 hours. The product was filtered and washed to obtain magnesium aluminum hydroxide hydrotalcite sol with a solid content of 15.2% in situ intercalation of lysine.

[0061] Weigh 1.65 parts of hydrotalcite sol synthesized above and dilute to 50 parts with deionized water to form a modified hydrotalcite dispersion; in addition, dissolve 0.75 parts of polyethyleneimine in 125 parts of deionized water . Mix the above polyethyleneimine aqueous solution with the modified hydrotalcite dispersion, and disperse...

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Abstract

The invention relates to a modified hydrotalcite-stabilized AKD emulsion sizing agent and a preparation method thereof, belonging to the technical field of papermaking sizing agent emulsification. The modified hydrotalcite-stabilized AKD emulsion sizing agent of the present invention is composed of an aqueous phase composed of amino acid in-situ intercalation hydrotalcite, polyethyleneimine and deionized water, and AKD; it solves the problem that hydrotalcite cannot be used for emulsifying and stabilizing AKD technical difficulties; provide a new emulsification stabilization method for obtaining AKD emulsion sizing agent. The AKD emulsion sizing agent combined with amino acid in-situ intercalation hydrotalcite and polyethyleneimine to stabilize the present invention has good dispersibility, good stability and high sizing efficiency; It is used as a surface sizing agent with a small amount; it can greatly improve the water resistance of paper and cardboard, and has the advantages of good sizing effect and fast curing speed.

Description

technical field [0001] The invention relates to a modified hydrotalcite-stabilized AKD emulsion sizing agent and a preparation method thereof, belonging to the technical field of papermaking sizing agent emulsification. Background technique [0002] AKD is the abbreviation of alkyl ketene dimer. As a reactive medium-alkaline sizing agent, it has high sizing efficiency, good compatibility with calcium carbonate filler, suitable for re-sizing, and can control the edge of cardboard. The advantages of particularly effective penetration have been widely used in papermaking. [0003] Since AKD is solid at room temperature and insoluble in water, it needs to be melted and emulsified to prepare an emulsion-type sizing agent before it can be used for sizing paper. Traditional AKD emulsion uses cationic starch as emulsifier and stabilizer, but the retention rate of this emulsion on fiber is low, the reaction with fiber is slow, and the sizing and curing time is long. The use of synt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H21/16
Inventor 李国栋刘温霞王慧丽于得海赵奇
Owner QILU UNIV OF TECH