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A method for preparing gypsum whiskers through organic/inorganic composite coating modification

A gypsum whisker and inorganic composite technology, applied in the direction of adding inorganic compounds, retention aids, etc., can solve the problems of increasing the affinity between gypsum whiskers and pulp, reducing the solubility of gypsum whiskers, poor adhesion, etc., to achieve good application The prospect, the operation method is simple and easy, and the effect of reducing production cost

Inactive Publication Date: 2015-10-28
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The modified gypsum whiskers can effectively solve the problems of low retention rate and poor adhesion to pulp during the papermaking process, and reduce the solubility of gypsum whiskers without changing its excellent physical and chemical properties. performance, and can increase the affinity of gypsum whiskers to pulp

Method used

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  • A method for preparing gypsum whiskers through organic/inorganic composite coating modification

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Embodiment 1

[0023] At room temperature, weigh 1.0g of barium hydroxide and dissolve it in 200ml of deionized water, then add 10.0g of gypsum whiskers, stir and react for 1h, then pass CO into the solution 2 , control the pH of the solution to 9.0, filter and dry to obtain inorganically modified gypsum whiskers. Weigh 0.1g chitosan and dissolve in 100mL1% dilute glacial acetic acid solution. Add an appropriate amount of 1 mol / L sodium hydroxide solution to the chitosan solution to adjust the pH to 5.5, add 10.0 g of inorganic modified gypsum whiskers to the solution, and stir for 2 to 3 hours. Then add an appropriate amount of 1 mol / L sodium hydroxide solution to the chitosan solution, adjust the pH to 8.0, stir and react for 2-3 hours, filter and dry to obtain the final modified gypsum whiskers.

Embodiment 2

[0025] At room temperature, weigh 1.5g of barium hydroxide and dissolve it in 200ml of deionized water, then add 10.0g of gypsum whiskers, stir and react for 1h, then pass CO into the solution 2 , control the pH of the solution to 8.5, filter and dry to obtain inorganically modified gypsum whiskers. Weigh 0.1g chitosan and dissolve in 100mL1% dilute glacial acetic acid solution. Add an appropriate amount of 1 mol / L sodium hydroxide solution to the chitosan solution to adjust the pH to 5.0, add 10.0 g of inorganic modified gypsum whiskers to the solution, and stir for 2 to 3 hours. Then add an appropriate amount of 1 mol / L sodium hydroxide solution to the chitosan solution, adjust the pH to 9.0, stir and react for 2-3 hours, filter and dry to obtain the final modified gypsum whiskers.

Embodiment 3

[0027] At room temperature, weigh 1.0g of barium hydroxide and dissolve it in 200ml of deionized water, then add 10.0g of gypsum whiskers, stir and react for 1h, then pass CO into the solution 2 , control the pH of the solution to 9.0, filter and dry to obtain inorganically modified gypsum whiskers. Weigh 0.5g chitosan and dissolve in 100mL1% dilute glacial acetic acid solution. Add an appropriate amount of 1 mol / L sodium hydroxide solution to the chitosan solution to adjust the pH to 5.0, add 10.0 g of inorganic modified gypsum whiskers to the solution, and stir for 2 to 3 hours. Then add an appropriate amount of 1 mol / L sodium hydroxide solution to the chitosan solution, adjust the pH to 8.5, stir and react for 2-3 hours, filter and dry to obtain the final modified gypsum whiskers.

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Abstract

The invention relates to a method for preparing gypsum whiskers through organic / inorganic composite coating modification. The method comprises the steps that: (1) gypsum whisker surface inorganic modification is carried out with an ion exchange method; (2) gypsum whisker surface organic modification is carried out by using a chitosan solution. According to the invention, modification treatment is carried out upon the gypsum whiskers, such that problems such as low retention rate and low adhesion with paper pulp during a papermaking process are effectively solved. Gypsum whisker solubility is reduced, and excellent physiochemical performances of the gypsum whiskers are not changed, and gypsum whisker affinity with paper pulp can be increased. Also, the modified gypsum whiskers can be used for replacing calcium carbonate as a novel papermaking filling material and can be applied in a papermaking process.

Description

technical field [0001] The invention belongs to the field of modification and preparation of gypsum whiskers, in particular to a method for preparing gypsum whiskers through organic / inorganic composite coating modification. Background technique [0002] Phosphogypsum whisker (Calcium Sulfate Whisker, also known as calcium sulfate microfiber, international trade name ONODA-GPF) is a new type of inorganic material with high comprehensive performance. In papermaking, gypsum whiskers exist in a colloidal state after adding additives, and have strong adsorption. It absorbs a large amount of positively charged electrolytes and forms a bridging effect with negatively charged fibers, so that the gypsum whiskers remain On the fiber, it can be well combined with wood fiber to make paper with excellent performance. However, due to the low retention rate of unmodified gypsum whiskers in the papermaking process and the high solubility of gypsum whiskers in aqueous solutions, phosphogyps...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H21/10D21H17/66
Inventor 赵敏杨军蒋青程雲华文怡方向
Owner EAST CHINA UNIV OF SCI & TECH