Papermaking surface sizing agent emulsified by magnetic composite particles and preparation method thereof

A surface sizing agent and particle emulsification technology, applied in the field of papermaking, can solve the problems of complex AKD emulsification process, environmental pollution and difficult control, and achieve the effects of avoiding adverse effects, reducing costs and improving pollution.

Inactive Publication Date: 2014-11-19
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Starch needs to be gelatinized and cooled before use, which makes the AKD emulsification process quite complicated and difficult to control, and often causes problems such as deposition and clogging of blankets
The surfactant also brings certain adverse effects to sizing, and also brings certain pollution to the environment.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A papermaking surface sizing agent emulsified by magnetic composite particles, the preparation method of which is as follows:

[0038] (1) Nano-Fe 3 o 4 Granular and Nano SiO 2 The particles were mixed according to the mass ratio of 1:1, and heated and stirred in a water bath at 50°C for 2 hours to obtain silicon dioxide-coated iron ferric oxide nanometer solid particles; Disperse iron oxide nanometer solid particles in deionized water, stir evenly to obtain a suspension, adjust the pH value of the suspension to 7 with 0.1mol / L hydrochloric acid, and obtain a well-dispersed, precipitate-free magnetic composite particle suspension after stirring evenly ; Wherein, the mass fraction of ferric iron tetroxide nanometer solid particles coated with silicon dioxide in the magnetic composite particle suspension is 1%;

[0039](2) Add hexadecyl ketene dimer to the reaction kettle, slowly add polyvinyl alcohol, raise the temperature to 80°C to make the additive in the reaction ...

Embodiment 2

[0046] A papermaking surface sizing agent emulsified by magnetic composite particles, the preparation method of which is as follows:

[0047] (1) Nano-Fe 3 o 4 Granular and Nano SiO 2 The particles were mixed according to the mass ratio of 1:1, heated and stirred in a water bath at 60°C for 2 hours to obtain silicon dioxide-coated iron ferric oxide nano-solid particles; Disperse iron oxide nanometer solid particles in deionized water, stir evenly to obtain a suspension, adjust the pH value of the suspension to 8 with 0.1mol / L sodium acetate solution, and obtain well-dispersed, non-precipitating magnetic composite particles after stirring evenly Suspension; wherein, the mass fraction of ferric oxide nanometer solid particles coated with silicon dioxide in the magnetic composite particle suspension is 2%;

[0048] (2) Add the tetradecyl ketene dimer to the reaction kettle, slowly add polyvinyl alcohol, raise the temperature to 85°C to make the additive in the reaction kettle ...

Embodiment 3

[0055] A papermaking surface sizing agent emulsified by magnetic composite particles, the preparation method of which is as follows:

[0056] (1) Nano-Fe 3 o 4 Granular and Nano SiO 2 The particles were mixed according to the mass ratio of 2:1, and heated and stirred in a water bath at 40°C for 2 hours to obtain silicon dioxide-coated iron ferric oxide nano-solid particles; Disperse ferric oxide nanometer solid particles in deionized water, stir evenly to obtain a suspension, adjust the pH value of the suspension to 9 with 0.1mol / L sodium hydroxide solution, and obtain a well-dispersed, precipitation-free magnetic complex after stirring evenly Particle suspension; wherein, the mass fraction of ferric oxide nanometer solid particles coated with silicon dioxide in the magnetic composite particle suspension is 3%;

[0057] (2) Add the dodecyl ketene dimer to the reaction kettle, slowly add polyvinyl alcohol, raise the temperature to 85°C to make the additive in the reaction ke...

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Abstract

The invention belongs to the technical field of papermaking, and discloses a papermaking surface sizing agent emulsified by magnetic composite particles and a preparation method thereof. The preparation method disclosed by the invention comprises the following steps: (1), dispersing ferroferric oxide nano solid particles wrapped by silicon dioxide in water, uniformly stirring to obtain suspension, and adjusting the pH value of the suspension, thereby obtaining the suspension of the magnetic composite particles; (2), adding alkyl ketene dimer into a reaction kettle, adding polyvinyl alcohol again, heating till the additives become liquid, and stirring with heat preservation, thereby obtaining sizing oil and liquid of the modified alkyl ketene dimer; and (3), heating the suspension of the magnetic composite particles by water bathing, adding the sizing oil and liquid of the modified alkyl ketene dimer, mixing, and emulsifying with heat preservation, thereby obtaining the papermaking surface sizing agent emulsified by the magnetic composite particles. The papermaking surface sizing agent disclosed by the invention is steady in emulsion and high in sizing efficiency and can endow paper with the water-resisting property and the magnetism; a surface active agent is unnecessary to add in the method; the use amount of an emulsifier is low; the method disclosed by the invention is low in cost and pollution and short in maturing time.

Description

technical field [0001] The invention belongs to the technical field of papermaking and relates to paper sizing technology, in particular to a papermaking surface sizing agent emulsified by magnetic composite particles and a preparation method thereof. Background technique [0002] Neutral sizing is a major progress in modern sizing technology, which greatly improves paper quality, expands the range of fillers, reduces pulp consumption, energy consumption, reduces environmental pollution, and prolongs the service life of equipment. inevitable development trend. According to statistics, Europe introduced cationic alkyl ketene dimer (AKD) neutral sizing in Europe in the 1970s. China has only conducted systematic research on it since the 1980s, and began to use medium and alkaline sizing in production, which has gradually become popular in recent years. Currently, alkyl ketene dimer (AKD) and alkenyl succinic Anhydride (ASA)-based. AKD is a reactive medium-alkaline sizing age...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H21/16
Inventor 林兆云李友明
Owner SOUTH CHINA UNIV OF TECH
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