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Surface modification method for calcium sulfate whiskers

A calcium sulfate whisker and surface modification technology, applied in the field of applied chemistry, can solve the problems of large waste of raw materials, high cost of water treatment, low tensile strength of paper, tear strength, folding resistance, and low bursting strength. Effects of lightening the burden and reducing the amount of Ca2+

Inactive Publication Date: 2016-02-24
SHANDONG UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of this, the technical problem to be solved by this application is that the retention rate of calcium sulfate whiskers in the papermaking process is low, the tensile strength, tear strength, folding resistance, and bursting strength of paper are low, the waste of raw materials is large, and water The high cost of treatment provides a method for surface modification of calcium sulfate whiskers

Method used

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  • Surface modification method for calcium sulfate whiskers

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Effect test

Embodiment 1

[0028] The surface modification method of the calcium sulfate whisker of the present application, comprises the following steps:

[0029] Preparation of anhydrous calcium sulfate whiskers: weigh Ca(NO 3 ) 2 4H 2 Dissolve O11.8g in 500ml tap water, configure 0.1mol / L calcium nitrate solution, add crystal growth agent MgCl 2 ·6H 2 O, the molar ratio of calcium to magnesium is 13:1. Filter out insoluble impurities and set aside, this is solution A. Heat in a water bath to keep solution A above 40°C, and add H at a concentration of 10% drop by drop. 2 SO 4 solution to Ca 2+ Precipitate completely, sink for 8 hours, filter, wash, and dry at 450°C to obtain anhydrous calcium sulfate whiskers.

[0030] Prepare the surface modifier solution: weigh 0.735 g each of sodium hexametaphosphate and sodium tripolyphosphate, and 0.525 g of zinc sulfate, and mix them evenly. Dissolve in 40mL tap water, add standard NaOH solution to adjust pH to 8, and form a stable solution.

[0031] ...

Embodiment 2

[0034] The surface modification method of the calcium sulfate whisker of the present application, comprises the following steps:

[0035] Preparation of anhydrous calcium sulfate whiskers: weigh Ca(NO 3 ) 2 4H 2 O35.4g is dissolved in 500ml tap water, configure 0.3mol / L calcium nitrate solution, add crystal growth agent MgCl 2 ·6H 2 O, the molar ratio of calcium to magnesium is 13:1. Filter out insoluble impurities and set aside, this is solution A. Heat in a water bath to keep solution A at 50°C, and add 20% H 2 SO 4 solution to Ca 2+ Precipitate completely, sink for 6 hours, filter, wash, and dry at 400°C to obtain anhydrous calcium sulfate whiskers.

[0036] Prepare the surface modifier solution: weigh 0.12 g each of sodium hexametaphosphate, sodium tripolyphosphate, and zinc sulfate, and mix them evenly. Dissolve in 100mL tap water, add standard NaOH solution to adjust the pH to 9 to form a stable solution.

[0037] Anhydrous calcium sulfate whisker modification:...

Embodiment 3

[0040] The surface modification method of the calcium sulfate whisker of the present application, comprises the following steps:

[0041] Preparation of anhydrous calcium sulfate whiskers: weigh Ca(NO 3 ) 2 4H 2 O47.2g is dissolved in 500ml tap water, configure 0.4mol / L calcium nitrate solution, add crystal growth agent MgCl 2 ·6H 2O, the molar ratio of calcium to magnesium is 13:1. Filter out insoluble impurities and set aside, this is solution A. Heat in a water bath to keep solution A at 60°C, and add 30% H 2 SO 4 solution to Ca 2+ Precipitate completely, sink for 2 hours, filter, wash, and dry at 200°C to obtain anhydrous calcium sulfate whiskers.

[0042] Preparation of surface modifier solution: weigh 0.30 g of sodium hexametaphosphate, 0.27 g of sodium tripolyphosphate, and 0.27 g of zinc sulfate, and mix them evenly. Dissolve in 270mL tap water, add standard NaOH solution to adjust pH to 10, and form a stable solution.

[0043] Anhydrous calcium sulfate whisk...

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Abstract

The invention discloses a surface modification method for calcium sulfate whiskers. The surface modification method comprises steps: anhydrous calcium sulfate whiskers are prepared; a surface modifier solution is prepared; the calcium sulfate whiskers are added slowly into the surface modifier solution with stirring, slow stirring is carried out, and a reaction is carried out; the modified anhydrous calcium sulfate whiskers are subjected to impurity removal processing. The method is simple, the steps are few, raw materials are saved, water processing burden is reduced, the anhydrous calcium sulfate whisker product has good performance, and tensile strength, the tear resistance, the folding strength and the pop strength are high. The solution synthesis method is employed, a calcium-containing industrial tail liquid is reacted with sulfuric acid, calcium sulfate whiskers are prepared, the cleaning utilization problem of calcium ions in the waste liquid is solved, which facilitates to achieve cyclic utilization of raw materials and resources are saved. The yield of the prepared calcium sulfate whiskers is high, the crystal form is structured and the length-to-diameter ratio is high.

Description

technical field [0001] The application belongs to the field of applied chemistry, and in particular relates to a method for modifying the surface of calcium sulfate whiskers. Background technique [0002] Calcium Sulfate Whisker, (Calcium Sulfate Whisker, abbreviated as CSW), also known as gypsum whisker, is a fibrous single crystal of calcium sulfate, which can be divided into anhydrous, semi-hydrated and dihydrated. Calcium sulfate whisker combines the advantages of ultra-fine inorganic materials and reinforcing fibers, and has excellent physical and chemical properties such as high mechanical strength, high modulus, high dielectric strength, wear resistance, high temperature resistance, corrosion resistance, and no fatigue effect. It has a good development prospect as a reinforcing material for paper. In addition, calcium sulfate whiskers have an incomparable price-to-performance ratio compared to other whiskers, and their promotion and use in the paper industry will cer...

Claims

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Application Information

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IPC IPC(8): C30B29/62C30B29/22C30B33/00
CPCC30B29/62C30B29/22C30B33/00
Inventor 王力庄春艳高登征
Owner SHANDONG UNIV OF SCI & TECH
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