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A kind of modified hectorite and sodium alginate synergistically stable akd emulsion sizing agent and preparation method

A technology of sodium alginate and hectorite, applied in the direction of adding water repellent, can solve the problems of reducing the amount of AKD emulsion stabilizer, the stability of the emulsion needs to be improved, and the amount of stabilizer added, etc., and achieve the speed of sizing and curing. The effect of fast, complete emulsification and less stabilizer dosage

Inactive Publication Date: 2016-04-20
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Chinese patent ZL200910231301.4 discloses a method for stabilizing AKD emulsion by modifying laponite with small molecule amine. This method not only uses less emulsifier, but also does not use traditional surfactants, which can significantly reduce the amount of AKD emulsion stabilizer. , the amount of small molecule amine-modified hectorite relative to AKD is only 2-4%, but the stability of the emulsion needs to be improved
However, the stability and sizing efficiency of the AKD sizing agent emulsion still need to be improved, and the addition of stabilizers may still be reduced

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Add 1 part of hectorite powder gradually to 98 parts of deionized water under constant stirring, and after it is fully swollen, a hectorite aqueous dispersion is formed; another 0.025 part of dodecyltrimethylammonium chloride is dissolved in 1 part Deionized water; the above hectorite dispersion was mixed with dodecyltrimethylammonium chloride solution to obtain a modified hectorite dispersion. Take 0.015 parts of sodium alginate and disperse it into 49.7 parts of deionized water to form an aqueous solution of sodium alginate. Mix the above-mentioned sodium alginate aqueous solution with the modified hectorite dispersion, and disperse it in an emulsifying disperser for 2 minutes, then heat it to 80 o C is reserved as the aqueous phase.

[0050] Weigh 30 parts of industrial AKD wax flakes, add them to the emulsifier, heat until it starts to melt, start the stirrer, control the speed at about 200r / min, and when the temperature rises to 75°C, add the water phase prepared ...

Embodiment 2

[0054] Gradually add 0.8 parts of hectorite powder to 99 parts of deionized water under constant stirring, and after it is fully swollen, an aqueous dispersion of hectorite is formed; another 0.008 part of dodecyltrimethylammonium chloride is dissolved in 1 part Deionized water; the above hectorite dispersion was mixed with dodecyltrimethylammonium chloride solution to obtain a modified hectorite dispersion. Take 0.02 parts of sodium alginate and disperse it into 59.6 parts of deionized water to form an aqueous solution of sodium alginate. Mix the above sodium alginate aqueous solution with the modified laponite dispersion, and after dispersing for 2 minutes in an emulsifying disperser, heat to 70 o C is reserved as the aqueous phase.

[0055] Weigh 20 parts of industrial AKD wax flakes, add them to the emulsifier, heat until it starts to melt, start the stirrer, control the speed at about 150r / min, and when the temperature rises to 65°C, add the water phase prepared above, a...

Embodiment 3

[0059] Gradually add 0.75 parts of hectorite powder to 99 parts of deionized water under constant stirring, and after it is fully swollen, a water dispersion of hectorite is formed; another 0.003 part of dodecyltrimethylammonium chloride is dissolved in 1 part of Deionized water; the above hectorite dispersion was mixed with dodecyltrimethylammonium chloride solution to obtain a modified hectorite dispersion. Take 0.006 parts of sodium alginate and disperse it into 49.6 parts of deionized water to form an aqueous solution of sodium alginate. Mix the above sodium alginate aqueous solution with the modified laponite dispersion, and after dispersing for 2 minutes in an emulsifying disperser, heat to 60 o C is reserved as the aqueous phase.

[0060] Weigh 15 parts of industrial AKD wax flakes, add them to the emulsifier, heat until it starts to melt, start the stirrer, control the speed at about 100r / min, and when the temperature rises to 60°C, add the water phase prepared above,...

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Abstract

The invention relates to an AKD emulsion sizing agent which is synergistically stable with modified hectorite and sodium alginate and a preparation method thereof, and belongs to the technical field of papermaking sizing agent emulsification. In the present invention, dodecyltrimethylammonium chloride is adsorbed on the surface of laponite by ion exchange with its quaternary ammonium group and sodium ion on the surface of laponite, reducing the surface negativity of laponite, while its long-chain hydrophobic Then the hydrophobicity of hectorite can be effectively improved, so the affinity of hectorite to molten AKD can be improved, so that the AKD emulsion can be completely emulsified and dispersible. After the molten AKD emulsion is cooled, the AKD droplets solidify into small solid particles. Sodium alginate has a large number of carboxyl groups, and the modified hectorite is wrapped on the surface of AKD particles at the same time, which can provide sufficient interface charge and mechanical barrier; prevent AKD particles from Inter-aggregation, thereby preventing the release of AKD and gelation of the emulsion, and improving the stability of the AKD emulsion sizing agent.

Description

technical field [0001] The invention relates to an AKD emulsion sizing agent which is synergistically stable with modified hectorite and sodium alginate and a preparation method thereof, and belongs to the technical field of papermaking sizing agent emulsification. Background technique [0002] AKD is the abbreviation of alkyl ketene dimer. It is solid at room temperature. After melting and emulsification, it is widely used as a medium-alkaline sizing agent in the paper industry. AKD has the advantages of high sizing efficiency and less dosage. Traditional AKD emulsions use a small amount of surfactants and cationic starches as emulsifiers and stabilizers. Because cationic starches need to be gelatinized before use, the emulsification process is complicated, the amount of stabilizers is large, and mildew is prone to occur; The use not only reduces the sizing efficiency of AKD, but also needs to add a defoamer, otherwise it will easily cause foam problems in the papermaking ...

Claims

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Application Information

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