Preparation of high length-diameter ratio magnesium hydroxide sulfate hydrate whisker

A magnesium sulfate whisker, high aspect ratio technology, applied in magnesium sulfate, chemical instruments and methods, single crystal growth and other directions, can solve the problems of complex process, uneven product morphology, limited technical industrial application, etc., and achieve cost The effect of low cost, high added value of products, and easy industrial promotion

Inactive Publication Date: 2009-01-21
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In short, although the predecessors have carried out some work on the preparation of 513MOS whiskers with high aspect ratio, there are st

Method used

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  • Preparation of high length-diameter ratio magnesium hydroxide sulfate hydrate whisker
  • Preparation of high length-diameter ratio magnesium hydroxide sulfate hydrate whisker
  • Preparation of high length-diameter ratio magnesium hydroxide sulfate hydrate whisker

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Prepare 40 ml of 5 mol / L magnesium sulfate solution and 40 ml of 5 mol / L sodium hydroxide solution, inject the above solutions into 80 ml of deionized water at a speed of 1 ml / min at 10°C and 500 rpm stirring conditions , continue to react for 0.5 hours after the feeding is completed, and obtain a white milky slurry; after filtering and washing the above slurry, add it to a hydrothermal reactor containing 0.5 mol / liter of sodium sulfate and 0.005 mol / liter of sodium citrate to make a solid content rate of 25% (w / v) suspension, stir and disperse, then stir at 100°C at 500 rpm for 2 hours, then cool, filter, wash, and dry to obtain an average length of 50 μm, an average diameter of 0.25 μm, and an aspect ratio 200. Hydrated basic magnesium sulfate whiskers with a main content of 98%.

Embodiment 2

[0027] Prepare 40 milliliters of 0.5 mol / liter magnesium chloride solution, 40 milliliters of 0.5 mol / liter potassium hydroxide solution, and inject the above solution into 200 milliliters of 1 mol / liter at a speed of 10 milliliters / minute at 90°C and 50 rpm stirring conditions Potassium sulfate solution, continue to react for 2 hours after the feeding is completed, and obtain a white milky slurry; filter and wash the above slurry and add it to a hydrothermal reactor containing 5 mol / L potassium sulfate and 0.0001 mol / L potassium tartrate to make a solid containing A suspension with a rate of 1% (w / v), stirred and dispersed, then stirred at a constant temperature of 50 rpm at 250°C for 20 hours, then cooled, filtered, washed, and dried to obtain an average length of 500 μm, an average diameter of 1 μm, and a long diameter Hydrated basic magnesium sulfate whiskers with a ratio of 500 and a main content of 99.5%.

Embodiment 3

[0029] Prepare 40 milliliters of 1 mol / liter magnesium sulfate solution, 40 milliliters of 5 mol / liter ammonia solution, and inject the above solution into 400 milliliters of 0.5 mol / liter chlorine at a speed of 5 milliliters / minute at 25°C and 200 rev / min stirring conditions. Potassium chloride solution, continue to react for 1 hour after the feeding is completed, and obtain a white milky slurry; add the above-mentioned slurry to a hydrothermal reactor containing 2 mol / liter of magnesium sulfate and 0.0004 mol / liter of ethylenediammonium tetraacetic acid after filtering and washing. Form a suspension with a solid content rate of 15% (w / v), stir and disperse, then stir at 180°C at a constant temperature of 100 rpm for 6 hours, then cool, filter, wash, and dry to obtain an average length of 160 μm and an average diameter of 0.08 Hydrated basic magnesium sulfate whiskers with μm, aspect ratio of 2000, and main content of 98.5%. figure 1 are the topography images of hydrothermal ...

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Abstract

A preparation method for hydrated basic magnesium sulfate crystal whisker with high-aspect ratio belongs to the technical field of inorganic chemical material preparation. The method comprises the following steps: water-soluble magnesium salt and inorganic base are taken as raw materials so as to prepare a precursor for nano magnesium hydroxide with better crystallinity and dispersivity in a substrate double-injection synthesis mode at a temperature between 10 and 90 DEG C; then the precursor is added into aqueous solution containing sulfate and micro chelated morphological control agent so as to carry out hydrothermal reaction at a temperature between 100 and 250 DEG C for 2 to 20 hours; and finally, one-dimensional growth of hydrothermal products is promoted by means of the selective adsorption and slow release action of the morphological control agent so as to prepare the hydrated basic magnesium sulfate crystal whisker with the average length of between 40 and 400mu m, the average diameter of between 0.05 and 0.2 mu m, the aspect ratio of between 200 and 2,000 and the main content more than 98 percent. The preparation method has the advantages of simple process, low cost, high added value of the product and easy industrial popularization; moreover, the product can be used in industries such as plastics, rubber, resin and ceramics as a reinforcing material.

Description

technical field [0001] The patent relates to a preparation method of hydrated basic magnesium sulfate whiskers with high aspect ratio, and belongs to the technical field of preparation of inorganic chemical materials. Background technique [0002] my country is a country with large magnesium resources, and salt lake magnesium resources and magnesite resources are very rich, which provides good conditions for the development of the magnesium salt industry, but most of the current magnesium salt products are primary products with little technical content and low added value (such as magnesium chloride, Magnesium sulfate, magnesium carbonate, common magnesium oxide and magnesium hydroxide, etc.), how to use abundant magnesium resources to prepare advanced magnesium salt functional materials with high added value and realize high-value utilization of magnesium resources is an imperative work . [0003] Among various advanced magnesium salt functional materials, the research and d...

Claims

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Application Information

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IPC IPC(8): C30B29/22C30B29/62C30B7/10C01F5/40
Inventor 向兰孙小涛史文涛
Owner TSINGHUA UNIV
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