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Stable ASA (Alkenyl Succinic Anhydride) papermaking sizing emulsion and preparation method thereof

A sizing emulsion, stable technology, applied in large high-speed paper machines, ASA paper sizing emulsion preparation, ASA paper sizing emulsion field, to achieve high sizing efficiency, simple process, high emulsion concentration

Inactive Publication Date: 2012-06-13
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the above ASA sizing agent, the amount of emulsifier is large, it will reduce the sizing efficiency, and it is easy to generate air bubbles. The present invention provides a kind of emulsifier amount Stable ASA paper-making sizing emulsion with less oil, simple emulsification process, and high sizing efficiency

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Preparation of emulsifier: disperse 0.56 parts of hectorite in 30 parts of water, disperse 0.056 parts of urea in 14 parts of water, mix the above two liquids, adjust the pH value to 6 with hydrochloric acid, and prepare a water phase.

[0024] Emulsification of ASA: Weigh 56 parts of the industrial product ASA, add the above-prepared water phase to the oily ASA, keep the oil-water ratio 1:0.8, and use a high-speed stirring device to stir and emulsify at 20,000 rpm for 10 minutes. The prepared ASA emulsion is a uniform milky white oil-in-water (O / W) emulsion, the mass percentage of ASA is about 56%, the emulsion is centrifuged under the centrifuge (speed 3000r / min) for 10min without change, no phase body precipitation, no Demulsification phenomenon.

[0025] In-pulp sizing effect: Take 100 parts of hardwood pulp and disperse in 9900 parts of water. After the dispersion is uniform, add 0.9 parts of the above-mentioned ASA emulsion, 2 parts of Al 2 (SO 4 ) 3 , mixed ev...

Embodiment 2

[0027] Preparation of emulsifier: disperse 0.66 parts of laponite in 40 parts of water, disperse 0.0066 parts of urea in 27 parts of water, mix the above two liquids, adjust the pH value to 6 with sulfuric acid, and prepare a water phase.

[0028] Emulsification of ASA: Weigh 33 parts of industrial product ASA, add it to the water phase prepared above, keep the oil-water ratio of 1:2, and use high-speed stirring equipment to stir and emulsify at 4000 rpm for 20 minutes. The prepared ASA emulsion is a uniform milky white oil-in-water (O / W) emulsion, the mass percentage of ASA is about 33%, the emulsion is centrifuged under the centrifuge (speed 3000r / min) for 10min without change, no phase body precipitation, no Demulsification phenomenon.

[0029] In-pulp sizing effect: Take 100 parts of hardwood pulp and disperse in 9900 parts of water. After the dispersion is uniform, add 1.5 parts of the above-mentioned ASA emulsion, 2 parts of Al 2 (SO 4 ) 3 , mixed evenly to form a pap...

Embodiment 3

[0031] Preparation of emulsifier: disperse 0.313 parts of laponite in 45 parts of water, disperse 0.0125 parts of urea in 30 parts of water, mix the above two liquids, adjust the pH value to 7 with citric acid, and prepare a water phase.

[0032] Emulsification of ASA: Weigh 25 parts of the industrial product ASA, add the above-prepared water phase to the oily ASA, keep the oil-water ratio 1:3, and use a high-speed stirring device to stir and emulsify at 8000 rpm for 5 minutes. The prepared ASA emulsion is a uniform milky white oil-in-water (O / W) emulsion, the mass percentage of ASA is about 25%, and the emulsion is centrifuged under the centrifuge (rotating speed 3000r / min) for 10min without change, no phase body precipitation, no Demulsification phenomenon.

[0033] In-pulp sizing effect: Take 100 parts of hardwood pulp and disperse in 9900 parts of water. After the dispersion is uniform, add 2 parts of the above-mentioned ASA emulsion, 2 parts of Al 2 (SO 4 ) 3 , mixed e...

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Abstract

The invention relates to the technical field of papermaking sizing agents, in particular to stable ASA (Alkenyl Succinic Anhydride) papermaking sizing emulsion. The stable ASA papermaking sizing emulsion comprises deionized water, ASA, hectorite and urea, wherein the mass ratio of the ASA to the deionized water is 1:(0.8-4); the mass ratio of the hectorite to the ASA is 1:(20-200); and the mass ratio of the urea to the hectorite is 1:(2-100). The preparation method comprises the following steps of: dispersing the hectorite with the deionized water to obtain a hectorite colloid; dissolving the urea in residual deionized water to prepare an aqueous solution of the urea; mixing the hectorite colloid with the aqueous solution of the urea; adjusting the pH value to be 5-8; and then uniformly mixing the mixture with the ASA to obtain the ASA papermaking sizing emulsion. According to the invention, the consumption of an emulsifying agent is little; no traditional surfactant is used; the emulsion has high concentration, favorable stability and high sizing efficiency; the preparation method is simple in process; the emulsification cost is low; and the sizing efficiency of the obtained emulsion can be greatly increased.

Description

technical field [0001] The invention relates to the technical field of papermaking sizing agents, in particular to a stable ASA papermaking sizing emulsion and a preparation method of the stable ASA papermaking sizing emulsion. Background technique [0002] In today's paper industry, neutral sizing has become the mainstream of sizing. Its main products are AKD (alkyl ketene dimer) and ASA (alkenyl succinic anhydride). These two sizing agents have their own characteristics. In comparison, ASA has high reactivity, has the advantages of high sizing efficiency, less dosage, fast curing speed, wide range of sizing pH value, and non-slip paper, etc. It is widely used in pulp application of high-grade paper and board Glue, especially suitable for large high-speed paper machines with in-machine coating. However, ASA is easy to hydrolyze, and hydrolysis not only reduces the sizing efficiency, but its hydrolyzed products can also cause obstacles to paper making. Therefore, ASA need...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H21/16
Inventor 王慧丽刘温霞王哲
Owner QILU UNIV OF TECH
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