Alkenyl succinic anhydride sizing agent as well as preparation method and application thereof

A technology of alkenyl succinic anhydride and alkenyl succinic acid, which is applied in the field of papermaking, can solve the problems that the adverse effects of surfactants cannot be completely avoided, the amount of surfactants is reduced, and the concentration of ASA emulsion is low, and the cost of emulsification is low. Improved glue performance and good hydrolysis resistance

Inactive Publication Date: 2020-10-09
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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, the ASA sizing agent emulsion prepared by the above method needs to be prepared and used immediately, and the stability of ASA is poor.

Method used

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  • Alkenyl succinic anhydride sizing agent as well as preparation method and application thereof
  • Alkenyl succinic anhydride sizing agent as well as preparation method and application thereof
  • Alkenyl succinic anhydride sizing agent as well as preparation method and application thereof

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preparation example Construction

[0028] The invention provides a kind of preparation method of alkenyl succinic anhydride sizing agent, comprises the following steps:

[0029] Alkenyl succinic anhydride and cellulose nanocrystal dispersion are mixed for first emulsification to obtain ASA-1 emulsion;

[0030] The ASA-1 emulsion is ultrasonically treated, and the obtained emulsion is mixed with nanocellulose fibers for second emulsification to obtain an alkenyl succinic anhydride sizing agent.

[0031] In the present invention, unless otherwise specified, the required preparation materials are commercially available products well known to those skilled in the art.

[0032] In the invention, the alkenyl succinic anhydride and the cellulose nano crystal dispersion liquid are mixed for the first emulsification to obtain the ASA-1 emulsion. In the present invention, the alkenyl succinic anhydride (ASA) is preferably at least one of dodecyl to octadecyl alkenyl succinic anhydride monomers; more preferably tetradecy...

Embodiment 1

[0049] CNC (the CNC prepared by the hydrochloric acid method) is dispersed in deionized water, dispersed with a high-speed shear disperser under the condition of 5000rpm, and prepared into a CNC dispersion liquid with a mass fraction of 0.05%, and then ASA (dodecenyl succinic anhydride ) was added to the CNC dispersion liquid according to the volume ratio of 1:20, and the first emulsification was carried out with a high-speed shear disperser at 2000r / min and 5°C for 2 minutes; ultrasonic treatment was performed at 55°C for 5 minutes, and then 1.5% (relatively The mass fraction of the CNC dispersion liquid) of CNF was emulsified for 2 minutes with a high-speed shear disperser at 5000 r / min at 5°C to obtain a Pickering-type ASA sizing agent emulsion with stable CNC / CNF emulsification.

Embodiment 2

[0051] CNC (CNC-S) is dispersed in deionized water, dispersed with a high-speed shear disperser under the condition of 8000rpm, and prepared into a CNC dispersion liquid with a mass fraction of 0.5%, and then ASA (dodecenyl succinic anhydride and Octenyl succinic anhydride mixture, each 50%) was added to the CNC dispersion at a volume ratio of 1:10, and the first emulsification was carried out for 5 minutes with a high-speed shear disperser at 5000r / min at 25°C; at 75°C After ultrasonic treatment for 8 minutes, 1.0% CNF was added, and the second emulsification was carried out with a high-speed shear disperser at 8000r / min and 25°C for 3 minutes to obtain a Pickering-type ASA paper sizing agent emulsion with stable CNC / CNF emulsification.

[0052] figure 1 Micrograph (400 times, scale is 100 μ m) of the Pickering type ASA sizing agent emulsion of the CNC / CNF emulsification stability prepared for embodiment 2; As can be seen from the figure, the obtained emulsion droplet is a un...

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Abstract

The invention belongs to the technical field of papermaking, and particularly relates to an alkenyl succinic anhydride sizing agent as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing alkenyl succinic anhydride and a cellulose nanocrystalline dispersion liquid, and carrying out first emulsification to obtain ASA-1 emulsion; and carrying out ultrasonic treatment on the ASA-1 emulsion, mixing the obtained emulsion with nano cellulose fibers, and carrying out second emulsification to obtain the alkenyl succinic anhydride sizing agent. Results of the embodiment show that the ASA sizing agent emulsion does not generate particle aggregation and precipitation after being placed for 30 days, does not have any phase body precipitation and demulsification phenomenon, and is good in stability; the paper sheet sizing degree of the sized paper is 224-332 seconds, and the sizing performance of the ASA sizing agent emulsion is good; after the ASA sizing agent emulsion is placed for 72 hours, the sizing degree of sized paper is 210-325 seconds, and the hydrolysis resistance of the emulsion is good.

Description

technical field [0001] The invention relates to the technical field of papermaking, in particular to an 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 the continuous phase ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H21/16D21H17/25D21H17/05
CPCD21H17/05D21H17/25D21H17/71D21H21/16
Inventor 于得海胡晓秋张海光王哲崔磊逄嘉瑞刘铭宇李新才李国栋刘温霞王慧丽宋兆萍
Owner QILU UNIV OF TECH
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