Hydrolysis-resistant alkenyl succinic anhydride sizing agent as well as preparation method and application thereof

Abstract

The invention provides a preparation method of a hydrolysis-resistant alkenyl succinic anhydride sizing agent. The preparation method comprises the following steps: mixing a CNC aqueous dispersion with acetone, ammonia monohydrate and hexadecyl trimethyl siloxane, and carrying out ultrasonic dispersion to obtain a mixed solution I; adding perfluorooctyltriethoxysilane into the mixed solution I, and carrying out ultrasonic dispersion to obtain a mixed solution II; drying the mixed solution II to obtain CNC-R powder; mixing CNC-R powder with perfluorohexane, carrying out ultrasonic dispersion, adding alkenyl succinic anhydride, mixing the components, and carrying out ultrasonic emulsification to obtain ASA-A emulsion; and mixing the ASA-A emulsion with a sodium dodecyl sulfate aqueous solution, and carrying out ultrasonic emulsification to obtain the hydrolysis-resistant alkenyl succinic anhydride sizing agent. The surface sizing performance of the ASA emulsion prepared by the method is remarkably improved, and meanwhile, the hydrolysis resistance of ASA can be greatly improved; in addition, the ASA sizing agent emulsion disclosed by the invention is simple in preparation process, low in emulsifying cost and good in sizing effect, and the dosage of an emulsifying agent is small.

Description

technical field [0001] The invention relates to the technical field of papermaking, in particular to a hydrolysis-resistant alkenyl succinic anhydride sizing agent and a preparation method and application thereof. Background technique [0002] Emulsion is a dispersion system formed by dispersing one liquid in another immiscible liquid. It is mostly formed by mixing water-insoluble oil phase and water phase. It is used in papermaking, food, cosmetics, medicine and other industries. widely. Emulsion is a thermodynamically unstable system. In order to maintain the relative stability of the emulsion (kinetic stability), an emulsifier or stabilizer must be added during the emulsion preparation process. Traditional emulsifiers or stabilizers are mostly surfactants and surface-active polymers, which maintain the stability of the emulsion by reducing the interfacial tension between the oil-water two-phase liquid, providing a stable interfacial film and increasing the viscosity of t...

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Problems solved by technology

U.S. Patent No. 6,284,099 discloses a method for stabilizing ASA emulsions by using anionic particulate retention aids for papermaking such as bentonite, colloidal silicon dioxide, organic particulates, and a small amount of surfactants and chelating agents. The particulate retention aids can be combined with the sizing agent For one, the operation is simplified and the amount of surfactant is reduced; but the adverse effects brought by the surfactant cannot be completely avoided, and the addition of the particle component is too large, and the concentration of the prepared ASA emulsion is very low, which is not conducive to the development of the emulsion. storage, ASA hydrolyzed severely

Chinese patent 201510417679.9 discloses a biodegradable solid particle emulsifier based on modified cellulose nanocrystalline particles and its emulsified ASA sizing agent. The emulsified emulsion has good stability and can meet general production requirements, but The stability of the emulsion is average, and the sizing activity can only be maintained for about 3 hours, which still cannot break away from the limitations of ASA used in on-site emulsification

[0005] In summary, at present, ASA sizing agent emulsions need to be prepared and used immediately, and ASA has poor stability and is easily hydrolyzed, and the shelf life of sizing agent emulsions for papermaking is short

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