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Method for modifying calcium sulphate whisker surface

A calcium sulfate whisker and surface modification technology, which is applied in chemical instruments and methods, crystal growth, inorganic compound addition, etc., can solve the problems of high cost, complicated operation, high solubility, etc., and achieve low cost, simple operation, physical and chemical The effect of excellent performance

Inactive Publication Date: 2015-05-27
JIANGSU EFFUL SCIENCE AND TECHNOLOGY CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the deficiencies of the above-mentioned prior art, the problem solved by the present invention is: the solubility of the gypsum whiskers added in papermaking is too high in water, and the method of modifying the surface of gypsum whiskers with organic matter is too expensive and complicated to operate

Method used

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  • Method for modifying calcium sulphate whisker surface

Examples

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Effect test

Embodiment 1

[0023] At room temperature, add calcium sulfate whiskers to deionized water. The mass ratio of calcium sulfate whiskers to deionized water is 1:9. After stirring, put it into an ultrasonic disperser and shake for 2 minutes to obtain a suspension for use. Sodium aluminate was added to the shaken calcium sulfate whisker solution, the mass ratio of sodium aluminate to calcium sulfate whisker was 1:10, and the surface chemical wrapping reaction was carried out at a temperature of 60°C for 2 hours. After diluting 2g of dry fiber to a certain concentration, add modified calcium sulfate whiskers and stir evenly. Inject water into the paper former, pour the slurry when the water reaches the 4 liter mark, add fully dissolved 0.04% (to the pulp) cationic polyacrylamide (CPAM) retention aid before the automatic air stirring, after the paper is formed Squeeze, peel off the paper, and dry. According to the relevant national standard GB / T742-2008, the retention rate of calcium sulfate whis...

Embodiment 2

[0025] At room temperature, add calcium sulfate whiskers to deionized water. The mass ratio of calcium sulfate whiskers to deionized water is 1:9. After stirring, put it into an ultrasonic disperser and shake for 3 minutes to obtain a suspension for use. Sodium aluminate was added to the shaken calcium sulfate whisker solution, the mass ratio of sodium aluminate to calcium sulfate whisker was 1:30, and the surface chemical wrapping reaction was carried out at a temperature of 65°C for 2.5 hours. After diluting 2g of dry fiber to a certain concentration, add modified calcium sulfate whiskers and stir evenly. Inject water into the paper former, pour the slurry when the water reaches the 4 liter mark, add fully dissolved 0.04% (to the pulp) cationic polyacrylamide (CPAM) retention aid before the automatic air stirring, after the paper is formed Squeeze, peel off the paper, and dry. According to the relevant national standard GB / T742-2008, the retention rate of calcium sulfate wh...

Embodiment 3

[0027] At room temperature, add calcium sulfate whiskers to deionized water. The mass ratio of calcium sulfate whiskers to deionized water is 1:9. After stirring, put it into an ultrasonic disperser and shake for 4 minutes to obtain a suspension for use. Sodium aluminate was added to the shaken calcium sulfate whisker solution, the mass ratio of sodium aluminate to calcium sulfate whisker was 1:50, and the surface chemical wrapping reaction was carried out at a temperature of 70°C for 3 hours. After diluting 2g of dry fiber to a certain concentration, add modified calcium sulfate whiskers and stir evenly. Inject water into the paper former, pour the slurry when the water reaches the 4 liter mark, add fully dissolved 0.04% (to the pulp) cationic polyacrylamide (CPAM) retention aid before the automatic air stirring, after the paper is formed Squeeze, peel off the paper, and dry. According to the relevant national standard GB / T742-2008, the retention rate of calcium sulfate whis...

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Abstract

The invention discloses a method for modifying a calcium sulphate whisker surface. The method comprises the following steps: (1) adding a calcium sulphate whisker into deionized water, stirring, pouring the obtained calcium sulphate whisker solution into an ultrasonic dispersing instrument and oscillating, wherein the mass rate of the calcium sulphate whisker to the deionized water is 1:9; (2) adding sodium aluminate into the oscillated calcium sulphate whisker solution, and performing chemical coating reaction, wherein the mass rate of the sodium aluminate to the calcium sulphate whisker is 1:(10-100). The calcium sulphate whisker surface is subjected to modification treatment, and the modified calcium sulphate whisker is used as a stuffing in a paper-making process, so that the retention rate in the paper reaches the level of calcium carbonate stuffing, the physical and chemical performances of the obtained paper are excellent, and the influence on popularization and application of the calcium sulfate whisker in the paper-making industry can be avoided.

Description

technical field [0001] The invention relates to a method for modifying the surface of calcium sulfate whiskers, in particular to a method for modifying the surface of calcium sulfate whiskers with inorganic substances. Background technique [0002] Gypsum whisker (Calcium Sulfate Whisker, CSW) is also known as calcium sulfate whisker, gypsum fiber, fiber calcium sulfate, and its chemical formula is CaSO 4 , is made of natural gypsum minerals as raw materials, through artificially controlled crystallization, drying, modification and other processes. Gypsum whiskers are fibrous single crystals of calcium sulfate, with high strength, high modulus, high dielectric strength, wear resistance, high temperature resistance, corrosion resistance, good infrared reflectivity, easy surface treatment, easy to compound with polymers, Non-toxic and many other excellent physical and chemical properties. The aspect ratio of gypsum whiskers is usually between 30 and 80, the average length is...

Claims

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Application Information

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IPC IPC(8): C30B33/00D21H17/69
Inventor 徐红英龚木荣丁大武
Owner JIANGSU EFFUL SCIENCE AND TECHNOLOGY CO LTD
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