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

A technology of alkenyl succinic anhydride and sizing agent, which is applied in the field of papermaking, can solve the problems of low ASA emulsion concentration, large amount of particle component addition, general emulsion stability, etc., and achieve good paper sizing performance and ultra-high flocculation Stability, effect of improving hydrolysis resistance

Active Publication Date: 2020-10-09
山东济清科技服务有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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
[0004] In summary, the ASA sizing agent emulsion prepared by the above method needs to be prepared and used immediately, and ASA has poor stability and cannot be stored for a long time

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

[0052] The present invention provides the preparation method of the alkenyl succinic anhydride sizing agent described in the above technical scheme, comprising the following steps:

[0053] Dispersing ethyl lauroyl arginate and hectorite in water to obtain an aqueous solution of ethyl lauroyl arginate modified hectorite;

[0054] Dispersing ethyl lauroyl arginate and cellulose nanocrystals in water to obtain an aqueous solution of ethyl lauroyl arginate modified cellulose nanocrystals;

[0055] mixing alkenyl succinic anhydride with the aqueous solution of ethyl lauroyl arginate modified hectorite, and performing first emulsification to obtain ASA-1 emulsion;

[0056] Mixing the aqueous solution of ethyl lauroyl arginate modified cellulose nanocrystals with the ASA-1 emulsion for second emulsification to obtain ASA-2 emulsion;

[0057] The nanocellulose fiber aqueous solution is mixed with the ASA-2 emulsion for the third emulsification to obtain the alkenyl succinic anhydrid...

Embodiment 1

[0069] Disperse ELA and LP in deionized water according to the mass ratio of 1:2, and ultrasonically oscillate for 30 minutes at room temperature under 600W power to obtain an ELA-LP aqueous solution with a mass fraction of 0.1%.

[0070] Disperse ELA and CNC in deionized water at a mass ratio of 1:5, and ultrasonically oscillate for 30 minutes at room temperature with a power of 600W to obtain an aqueous solution of ELA-CNC with a mass fraction of 0.05%;

[0071] ASA was added to the ELA-LP aqueous solution (the oil-water mass ratio of ASA and ELA-LP aqueous solution was 1:50), and a high-speed shear emulsifier was used to carry out the first emulsification at 1000rpm and 5-50°C for 2 minutes to obtain ASA-1 emulsion, the average particle size of emulsion droplets is 6.8μm, such as figure 1 shown;

[0072] Mix the ELA-CNC aqueous solution and the ASA-1 emulsion according to the mass ratio of 1:20, continue to carry out the second emulsification at 65°C with a high-speed shea...

Embodiment 2

[0096] Disperse ELA and LP in deionized water at a mass ratio of 1:10, and ultrasonically shake at room temperature for 30 minutes at a power of 1200W to obtain an aqueous solution of ELA-LP with a mass fraction of 0.5%.

[0097] Disperse ELA and CNC in deionized water at a mass ratio of 1:10, and oscillate ultrasonically for 30 minutes at room temperature to obtain a 0.45% ELA-CNC aqueous solution;

[0098] Add ASA to the ELA-LP aqueous solution (the oil-water mass ratio of ASA and ELA-LP aqueous solution is 1:20), and use a high-speed shear emulsifier at 6000rpm to perform the first emulsification at 30°C for 5 minutes to obtain ASA-1 Emulsion, the average particle size of emulsion droplets is 7.6 μm;

[0099] Mix the ELA-CNC aqueous solution and the ASA-1 emulsion at a mass ratio of 1:10, continue to perform the second emulsification with a high-speed shear emulsifier at 10,000 rpm for 5 minutes at 65°C, and cool to room temperature to obtain ASA-2 emulsion, emulsion The a...

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Abstract

The invention belongs to the technical field of papermaking and especially relates to an alkenyl succinic anhydride sizing agent. In the invention, ethyl lauroyl arginate, cellulose nanocrystals and nanocellulose fibers are used as raw materials, wherein the obtained alkenyl succinic anhydride sizing agent emulsion is a Pickering type emulsion and has ultrahigh flocculation stability, hydrolysis resistance stability and paper pulp internal sizing performance. The surface and in-pulp sizing performance of the alkenyl succinic anhydride sizing agent emulsion is remarkably improved; meanwhile, the hydrolysis resistance of the alkenyl succinic anhydride sizing agent can be greatly improved, and good paper sizing performance can still be kept after the alkenyl succinic anhydride sizing agent emulsion is placed for 48-72 hours; and the alkenyl succinic anhydride sizing agent emulsion does not generate particle aggregation, precipitation or phase separation within 180 days, and has good stability.

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] In recent years, alkenyl succinic anhydride (ASA) sizing agent has been widely used in internal sizing of high-grade paper and paperboard due to its high reactivity, low cost of sizing material and fast aging rate, especially for large-scale high-speed coating in-machine Sizing for paper machines. However, ASA is a highly reactive paper-making neutral sizing agent, and its hydrolysis speed is very fast. After its emulsion is stored at room temperature for more than 1 hour, the sizing effect will decrease, and the hydrolyzate will cause obstacles to papermaking and reduce sizing efficiency. Therefore, when using ASA, it is required that it can be quickly emulsified, and the emulsified emulsion should be used as soon as possible. However, ASA is not only ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H21/16
CPCD21H21/16
Inventor 于得海张海光王哲张建唐国汉张宝帅张旭贺博李国栋刘温霞王慧丽宋兆萍
Owner 山东济清科技服务有限公司
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