Preparation method of alginate-coated calcium carbonate particle stable papermaking sizing agent emulsion

A technology of alginate and calcium carbonate, applied in the direction of adding water repellent, adding inorganic compounds, etc., can solve the problems of emulsion damage and easy reaction, and achieve the effect of stable emulsion, avoiding foam problems and good sizing effect.

Active Publication Date: 2019-07-12
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Calcium carbonate, as an inorganic particle, can also be used as a particle for the preparation of Pickering emulsions, but...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Microparticle preparation: Disperse 1 part of calcium carbonate in 26.8 parts of water, 0.2 part of sodium alginate in 20 parts of water, fully mix the above two dispersions, add 0.01 part of gluconolactone, and fully react in ultrasonic for 3 hours, Prepare the alginate-coated calcium carbonate particle dispersion.

[0022] Emulsion preparation: Weigh 12 parts of the industrial product ASA, put it in a water bath at 25°C with the calcium carbonate particle dispersion prepared above to keep the temperature constant, and use a high-speed stirring device to stir and emulsify at a speed of 5000 rpm for 3 minutes. A uniform milky white oil-in-water (O / W) ASA emulsion with a ratio of sizing agent to water of 1:4 was obtained.

[0023] In-pulp sizing effect: Take 100 parts of poplar chemical mechanical pulp and disperse it in 9900 parts of water. After the dispersion is uniform, add 1.5 parts of the above-mentioned ASA emulsion, 0.03 parts of CPAM, and 0.3 parts of bentonite....

Embodiment 2

[0025] Microparticle preparation: Disperse 1 part of calcium carbonate in 2.9 parts of water, 0.1 part of sodium alginate in 10 parts of water, fully mix the above two dispersions, add 0.005 part of gluconolactone, and fully react in ultrasonic for 1 hour, Prepare the alginate-coated calcium carbonate particle dispersion.

[0026] Emulsion preparation: Weigh 7 parts of the industrial product ASA, put it in a 35°C water bath with the calcium carbonate particle dispersion prepared above to keep the temperature constant, and use a high-speed stirring device to stir and emulsify at 2000 rpm for 5 minutes. A uniform milky white oil-in-water (O / W) ASA emulsion with a ratio of sizing agent to water of 1:2 was obtained.

[0027] In-pulp sizing effect: Take 100 parts of softwood bleached pulp and disperse it in 9900 parts of water. After the dispersion is uniform, add 0.9 part of the above-mentioned ASA emulsion, 0.03 part of CPAM, and 0.3 part of bentonite. French paper sheet former ...

Embodiment 3

[0029] Microparticle preparation: Disperse 1 part of calcium carbonate in 337 parts of water, 2 parts of sodium alginate in 200 parts of water, fully mix the above two dispersions, add 0.05 part of gluconolactone, fully react under the action of magnetic stirring for 12 Hours, the alginate-coated calcium carbonate particle dispersion was obtained.

[0030] Emulsion preparation: Weigh 60 parts of the industrial product AKD, put it in a water bath at 85°C with the calcium carbonate particle dispersion prepared above, and stir and emulsify with a high-speed stirring device at 10,000 rpm for 2 minutes. A uniform milky white oil-in-water (O / W) AKD emulsion with a ratio of sizing agent to water of 1:9 was obtained.

[0031] In-pulp sizing effect: Take 100 parts of hardwood bleached pulp and disperse it in 9900 parts of water. After the dispersion is uniform, add 2 parts of the above-mentioned AKD emulsion, 0.03 part of CPAM, and 0.3 part of bentonite. French paper sheet former copy...

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Abstract

The invention discloses a preparation method of an alginate-coated calcium carbonate particle stable papermaking sizing agent emulsion. The method comprises the steps of (1), preparation of alginate-coated calcium carbonate particles, wherein a sodium alga acid solution and a calcium carbonate dispersion liquid are mixed uniformly, under stirring, an appropriate amount of gluconolactone is added,a full reaction is performed, and the alginate-coated calcium carbonate particles are prepared; (2) preparation of a papermaking sizing agent emulsion, the prepared alginate-coated calcium carbonate particles are mixed with a papermaking sizing agent liquid oil phase, stirring is performed for a certain period of time under mechanical action, and the stable O/W type papermaking emulsion is obtained. The prepared alginate-coated calcium carbonate particles can be used for the preparation of the papermaking sizing agent emulsion. No surfactant is added during the preparation of the sizing agentemulsion, the foam problem brought by the surfactant is avoided, the prepared emulsion is stable, and the sizing effect is good.

Description

technical field [0001] The invention relates to a method for preparing paper-making sizing agent emulsion, in particular to a method for preparing alginate-coated and modified calcium carbonate particles, and a method for preparing the emulsion by stabilizing the particle-made paper-making sizing agent. Background technique [0002] Most paper production processes require the addition of paper sizing agents to improve the water resistance of the paper. The molecular structure of the papermaking sizing agent contains hydrophobic groups, which are immiscible with water and need to be prepared in advance and added to the pulp in the form of an emulsion. At present, the most commonly used medium-alkaline papermaking sizing agents are alkyl ketene dimers and alkenyl succinic anhydrides, which are emulsified with surfactants and a large amount of starch. Surfactants will reduce the sizing efficiency and easily generate air bubbles. The paper system brings foam problems and even p...

Claims

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Application Information

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IPC IPC(8): D21H21/16D21H17/69
CPCD21H17/69D21H21/16
Inventor 王慧丽于伟琦赵英豪冯金虎彭庆港宋兆萍刘温霞
Owner QILU UNIV OF TECH
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