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A kind of asa emulsifier and a kind of asa sizing agent emulsion

An emulsifier and sizing agent technology, applied in the directions of adding water repellents, adding inorganic compounds, adding non-fiber pulp, etc., can solve the problems of reducing the hydrophilicity of hectorite, reducing the sizing performance, and adding a large amount, etc. Achieve the effect of increasing effective ASA content and sizing efficiency, improving hydrolytic stability and reducing starch dosage

Active Publication Date: 2019-09-10
山东熙来淀粉有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the sizing performance of ASA emulsion stabilized by n-butylamine, alanine and quaternary ammonium salt modified hectorite decreased significantly with the prolongation of storage time; while urea as a small molecule amide modified hectorite , has the disadvantage of adding a large amount
In addition, polyaluminum sulfate, as an inorganic cationic polymer, can interact with negatively charged hectorite, trigger dehydration and aggregation of hectorite, reduce the hydrophilicity of hectorite, and stabilize ASA emulsion when combined with hectorite , the emulsion has good hydrolytic stability and sizing effect; but polyaluminum sulfate needs to be synthesized on site, which makes the on-site preparation technology of ASA emulsion quite complicated
In addition, the prior art also discloses the use of polyvinylpyrrolidone and laponite to stabilize ASA emulsions. Polyvinylpyrrolidone has a high molecular weight and a weak positive charge. By triggering the weak flocculation of laponite, it improves its The stability of the ASA sizing agent emulsion synergistically stabilized with hectorite, and the sizing efficiency of the ASA sizing agent emulsion did not change significantly after standing for 1 hour
However, similar to other modified hectorite-stabilized ASA emulsions, in the preparation of this emulsion, hectorite is still the main stabilizer for the preparation of ASA emulsions and the price is relatively high. While promoting ASA sizing, it can also promote ASA sizing. hydrolysis, therefore, it is still necessary to further reduce the cost of emulsion preparation and reduce the hydrolysis of ASA

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Gradually disperse 0.2 parts of laponite powder into 20 parts of deionized water under constant stirring, and form a water dispersion of hectorite after it is fully swollen; take 0.5 parts of corn starch and 55 parts of deionized water, and raise the temperature to 90 o C, after 20 minutes of gelatinization, cool to 30 o Below C. Mix the above hectorite aqueous dispersion with the raw corn starch solution to form a water phase; take 25 parts of ASA as the oil phase. Add the water phase prepared above into the oil phase under stirring, and use high-speed emulsification and shearing equipment to stir and emulsify at a speed of 4000 rpm for 3 minutes to obtain an oil-in-water ASA emulsion. The mass percentage of ASA in the emulsion is It is about 25%, and no water phase or oil phase precipitates out after the emulsion is left for 24 hours.

[0047] Take 100 parts and the degree of beating is about 40 o SR poplar alkaline hydrogen peroxide mechanical pulp was added to 99...

Embodiment 2

[0050] Gradually disperse 0.15 parts of hectorite powder into 15 parts of deionized water under constant stirring, and form a water dispersion of hectorite after it is fully swollen; take 1 part of corn starch and 45 parts of deionized water, and heat up to 90 o C, after 20 minutes of gelatinization, cool to 30 o Below C. Mix the above hectorite aqueous dispersion with the raw corn starch solution to form a water phase; take 30 parts of ASA as the oil phase. Add the water phase prepared above into the oil phase under stirring, and use high-speed emulsification shearing equipment to stir and emulsify at a speed of 6000 rpm for 2 minutes to obtain an oil-in-water ASA emulsion. The mass percentage of ASA in the emulsion is It is about 33.3%, and no water phase or oil phase precipitates out after the emulsion is left for 24 hours.

[0051] Take 100 parts and the degree of beating is about 40 o SR poplar alkaline hydrogen peroxide mechanical pulp was added to 9900 parts of water...

Embodiment 3

[0054] Gradually disperse 0.1 part of hectorite powder into 10 parts of deionized water under constant stirring, and after it is fully swollen, form the water phase between the hectorite water dispersion liquid; take 1 part of raw corn starch and 65 parts of deionized water , warming up to 90 o C, after 20 minutes of gelatinization, cool to 30 o Below C. Mix the above hectorite aqueous dispersion with the raw corn starch solution to form a water phase; take 25 parts of ASA as the oil phase. Add the water phase prepared above into the oil phase under stirring, and use high-speed emulsification shearing equipment to stir and emulsify at a speed of 3000 rpm for 5 minutes to obtain an oil-in-water ASA emulsion. The mass percentage of ASA in the emulsion is It is about 25%, and no water phase or oil phase precipitates out after the emulsion is left for 24 hours.

[0055] Take 100 parts and the degree of beating is about 40 o SR poplar alkaline hydrogen peroxide mechanical pulp ...

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Abstract

The invention relates to an emulsifier for ASA and an ASA sizing agent emulsion, belonging to the technical field of emulsification of sizing agents for papermaking. The emulsifier of ASA is composed of raw corn starch and laponite in a mass ratio of 2.5-15: 1, wherein the raw corn starch contains multi-branch-structured amylopectin and linear-structured amylose, and the raw corn starch has no charge, which allows electrostatic repulsion among molecules to be avoided; and the laponite has a plate-like structure, has a large specific surface area and negative charges, exerts good adsorption effect on ASA, and can enter the branches of amylopectin molecules. When the raw corn starch and laponite are cooperatively used for stabilizing the ASA emulsion, multi-branch-structured amylopectin molecules, linear amylose molecules and flaky laponite cooperate with each other to form a complete and dense interfacial film around ASA oil droplets, so steric hindrance is produced and aggregation of ASA oil droplets is effectively prevented; and thus, emulsification and stabilization of ASA are realized.

Description

technical field [0001] The invention relates to an ASA emulsifier and an ASA sizing agent emulsion, and belongs to the technical field of papermaking sizing agent emulsification. Background technique [0002] ASA (alkenyl succinic anhydride, alkenyl succinic anhydride), as an important medium-alkaline reactive paper sizing agent, has been more and more widely used in the paper industry. ASA has high reactivity and is easy to hydrolyze. It is often supplied to papermaking enterprises in the form of oil, and emulsified on site in the papermaking workshop, and added to the papermaking system as an oil-in-water emulsion. At present, the emulsifiers used in the industry to emulsify ASA include: cationic starch, anionic dispersant and solid particles. [0003] The quaternary ammonium group of cationic starch can not only promote the sizing of ASA, but also promote the hydrolysis of ASA in the emulsion. In order to reduce the hydrolysis of ASA and improve the sizing performance o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H21/16D21H17/14D21H17/28D21H17/68
Inventor 刘温霞公备李国栋宋兆萍王慧丽
Owner 山东熙来淀粉有限公司