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Alkenyl butanedioic anhydride sizing emulsion and preparation method thereof

A technology of alkenyl succinic anhydride and sizing emulsion, applied in directions such as adding water repellent, can solve problems such as low production efficiency, huge energy consumption, complex emulsification process, etc., and achieve good sizing performance, good stability, preparation simple craftsmanship

Inactive Publication Date: 2014-05-07
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Complicated emulsification process, huge energy consumption and low production efficiency are the key factors hindering the wide application of ASA, and the use of surfactants will also affect the sizing effect of ASA and the normal operation of paper machines

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Weigh urea and anhydrous sodium citrate and mix them according to the molar ratio of 6:1. After mixing evenly, put them into the autoclave. After heating at 150 ° C for 1 hour, cool down to room temperature. High-speed centrifugation at 15,000 rpm to remove large impurities in the lower layer, and the upper layer solution was dialyzed with a dialysis membrane with a molecular weight cut-off of 3,500 M for 24 hours. After dialysis, carbon quantum dots with a particle size of 1 to 5 nm were obtained, and dried at 105 ° C to obtain carbon quantum dot solid powder. , its aqueous dispersion is pale yellow under visible light. The carbon quantum dots and alumina sol were prepared into an aqueous dispersion with a total mass fraction of 2% according to the mass ratio of carbon quantum dots to alumina 1:2. As the water phase, a high-speed shearing emulsifier (FA200, Shanghai Fluke Fluid Machinery Manufacturing Co., Ltd., the same below) stirring at 10,000 rpm, while stirrin...

Embodiment 2

[0027] Weigh urea and sodium citrate hydrate and mix them in a molar ratio of 1:1, mix them evenly, put them into an autoclave, heat at 150°C for 1 hour, cool to room temperature, boil the product at 105°C, and then heat it at 15000rpm Centrifuge at high speed at high speed to remove large impurities in the lower layer, take the upper layer solution and dialyze with a dialysis membrane with a molecular weight cut-off of 3500M for 24 hours, obtain carbon quantum dots with a particle size of 2-4nm after dialysis, and dry at 105°C to obtain solid powder of carbon quantum dots. Its aqueous dispersion is light yellow under visible light. Carbon quantum dots and alumina sol are formulated into an aqueous dispersion with a total mass fraction of 2% according to the mass ratio of carbon quantum dots to alumina 1:5. As the water phase, stir at a speed of 3000rpm with a high-speed shear emulsifier. while setting the carbon chain length to C 12 The dodecenyl succinic anhydride is ad...

Embodiment 3

[0029] Weigh urea and sodium citrate hydrate and mix them in a molar ratio of 3:1, mix them evenly, put them into an autoclave, heat at 150°C for 1 hour, cool to room temperature, boil the product at 105°C, and then heat it at 15000rpm Centrifuge at high speed at high speed to remove large impurities in the lower layer, take the upper layer solution and dialyze with a dialysis membrane with a molecular weight cut-off of 3500M for 24 hours. After dialysis, carbon quantum dots with a particle size of 3-5nm are obtained, and dried at 105°C to obtain solid carbon quantum dot powder. Its aqueous dispersion is light yellow under visible light. Carbon quantum dots and alumina sol are formulated into an aqueous dispersion with a total mass fraction of 2% according to the mass ratio of carbon quantum dots to alumina 1:1, as the water phase, and stirred at a speed of 5000rpm with a high-speed shear emulsifier, stirring while setting the carbon chain length to C 14 The tetradecenyl ...

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Abstract

The invention relates to an alkenyl butanedioic anhydride sizing emulsion and a preparation method thereof, and belongs to the technical field of papermaking sizing agents and related industrial emulsification. According to the invention, an alkenyl butanedioic anhydride sizing agent is emulsified by use of the synergistic effect of carbon quantum dots and aluminum oxide for the first time, so that the type of amphipathic solid particle emulsion stabilizers for emulsifying and stabilizing ASA (Acrylonitrile Styrene Acrylate copolymer) is expanded. The average grain diameter of the alkenyl butanedioic anhydride sizing emulsion obtained by the invention is 3-5 mu m, and the emulsion is good in stability, free from separation of phase bodies within 12 hours and high in sizing efficiency. The emulsion provided by the invention is simple in preparation process and free from toxicity and pollution, and no surfactants and macromolecular polyelectrolytes need to be added when being use.

Description

technical field [0001] The invention relates to an alkenyl succinic anhydride sizing emulsion and a preparation method thereof, belonging to the technical field of papermaking sizing agents and related industrial emulsification. Background technique [0002] The transition of the paper industry from the acidic papermaking system to the medium and alkaline papermaking is an innovative change in the papermaking process in the 20th century, which can not only improve the paper quality and expand the range of fillers, but also reduce pulp consumption, energy consumption, environmental pollution, Extend the life of the equipment. At present, the sizing agents used in medium and alkaline papermaking are mainly alkyl ketene dimer (AKD) and alkenyl succinic anhydride (ASA). Large and medium-sized paper mills gradually use ASA. Especially in recent years, due to its high reactivity, low cost of sizing material, and fast curing rate, it has been widely used in the internal si...

Claims

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Application Information

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IPC IPC(8): D21H21/16
Inventor 于得海刘温霞李国栋王慧丽
Owner QILU UNIV OF TECH
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