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Method for preparing magnetism papermaking sizing agent stabilized by magnetism solid particle emulsification

A solid particle, emulsification-stabilized technology, applied in papermaking, textiles and papermaking, paper, etc., can solve the problems of complex emulsification process of ASA, clogging of felts, difficult to control, etc., to avoid adverse effects, improve pollution, improve concentration and stability. Effect

Inactive Publication Date: 2015-06-03
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, starch needs to be gelatinized and cooled before use, which makes the ASA emulsification process quite complicated, difficult to control, and often causes problems such as deposition and clogging of felts
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

[0021] The magnetic nano-Fe with a particle size of 20nm 3 o 4 Disperse in deionized water and ultrasonically disperse for 0.5h to obtain nano-Fe 3 o 4 The solid suspension with a mass fraction of 1.5%, adjusted the pH value to 3.5-4 with 0.1mol / L glacial acetic acid, added absolute ethanol, and added γ-methacryloxypropyltrimethoxysilane (KH -570); the volume ratio of water, ethanol and γ-methacryloxypropyltrimethoxysilane is 1:1:2; stir in a constant temperature water bath at 65°C for 5 hours, and then wash with absolute ethanol repeatedly by centrifugation after cooling to room temperature , and the obtained solid was dried at 60° C. to obtain KH-570 modified magnetic nanoparticles.

[0022] The modified magnetic nanometer solid particles were dispersed in deionized water and ultrasonically dispersed to obtain a water suspension with a mass fraction of magnetic solid particles of 0.1%. Alkenyl succinic anhydride and water suspension are mixed according to the volume rati...

Embodiment 2

[0025] Magnetic nanometer γ-Fe with a particle size of 35nm 2 o 3 Disperse in deionized water, ultrasonically disperse for 0.5h to form a solid suspension with a mass fraction of 2.0%, add the same volume of absolute ethanol as deionized water, adjust the pH value to 4-5 with 0.1mol / L dilute hydrochloric acid, gradually Add γ-glycidyloxypropyltrimethoxysilane (KH560) dropwise, by volume, water: ethanol: γ-glycidyloxypropyltrimethoxysilane = 1:1:4, 70°C constant temperature water bath Stir for 4 hours, cool to room temperature, and repeatedly centrifuge and wash with absolute ethanol, and dry the obtained solid at 60° C. to obtain KH-560 modified magnetic nanoparticles.

[0026] The modified magnetic nanometer solid particles were dispersed in deionized water and ultrasonically dispersed to obtain a water suspension with a mass fraction of magnetic solid particles of 0.5%. Alkenyl succinic anhydride and water suspension are mixed according to the volume ratio of 3: 2, and the...

Embodiment 3

[0028] Magnetic nanometer MeFe with a particle size of 30nm 2 o 4 Disperse the particles in deionized water, ultrasonically disperse for 1 hour to form a solid suspension with a mass fraction of 3.0%, add the same volume of absolute ethanol, adjust the pH value to 5-6 with 0.2mol / L glacial acetic acid, add γ- Chloropropyltriethoxysilane (KH550), by volume ratio, deionized water: ethanol: γ-chloropropyltriethoxysilane = 1:1:8, stirred in a constant temperature water bath at 85°C for 6h, cooled to room temperature Afterwards, it was centrifuged and washed repeatedly with absolute ethanol, and the obtained solid was dried at 60° C. to obtain KH-550 modified magnetic nanoparticles.

[0029] The modified magnetic nanometer solid particles were dispersed in deionized water and ultrasonically dispersed to obtain an aqueous suspension with a mass percentage of magnetic solid particles of 1.0%. Alkenyl succinic anhydride and water suspension are mixed according to the volume ratio of...

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Abstract

The invention discloses a method for preparing a magnetism papermaking sizing agent stabilized by magnetism solid particle emulsification. The method comprises the steps of adding magnetism nanometer solid particles in the particle diameter of 18nm to 50nm into deionized water, carrying out ultrasonic dispersion, adding absolute ethyl alcohol, then adding a silane coupling agent, stirring, standing the solution, cooling the solution to room temperature, obtaining magnetism nanometer solid particles modified by the silane coupling agent, then dispersing the magnetism nanometer solid particles into deionized water, mixing the solution with alkenyl succinic anhydride oil liquid, carrying out high-speed shearing emulsification, and obtaining the magnetism papermaking sizing agent stabilized by the magnetism solid particle emulsification. The magnetism papermaking sizing agent with the stable magnetism solid particle emulsification prepared by the method allows a paper sheet to have water resistance, meanwhile has magnetism, and is high in sizing efficiency, simple in preparation, capable of allowing alkenyl succinic anhydride to be emulsified into Pickering type emulsion with quite high stability without addition of any superficial active agent, little in emulsion emulsifier dosage, high in stability and low in foam, toxicity and cost.

Description

technical field [0001] The invention relates to a preparation method of a magnetic sizing agent, in particular to a preparation method of a magnetic paper-making sizing agent which is emulsified and stable by magnetic nanometer solid particles. Background technique [0002] In the 20th century, the papermaking industry shifted from the acidic papermaking system to the medium-alkaline papermaking system, which was an innovative change in the papermaking process. It greatly improved the quality of paper and expanded the range of fillers, reduced pulp consumption and energy consumption, reduced environmental pollution, and extended the service life of equipment. service life. According to statistics, in the early 1980s in Europe, the cultural paper produced by medium and alkaline sizing accounted for 60% to 65% of the total cultural paper, and it reached 95% in the 1990s. Alkaline sizing ratio jumped from 15% to over 90%. Since 1989, China has started to use medium and alkali...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H21/16D21H17/14D21H17/69
Inventor 林兆云于得海李友明
Owner SOUTH CHINA UNIV OF TECH
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