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High length-diameter ratio antifungin whisker synthesis method

A magnesium borate whisker and synthesis method technology, applied in the field of magnesium borate whisker synthesis, can solve the problems of large-scale industrial implementation difficulty, expensive equipment, environmental pollution, etc., to reduce spray drying process, reduce service life, and avoid gas pollution effect

Active Publication Date: 2006-07-26
青海中信国安科技发展有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1) A large amount of water and HCl gas will be released during the high-temperature melting reaction, which is highly corrosive to the high-temperature heating furnace, easily causes environmental pollution, and is difficult to implement on a large scale in the industry;
[0005] 2) The spray drying process is complex and consumes a lot of energy. The raw materials are mixed with the flux in the aqueous solution. Although the mixture is uniform, the amount of water added is large, and it needs to be heated to evaporate the added water, which consumes a lot of energy and is expensive. It is complex and the process conditions are relatively harsh;

Method used

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  • High length-diameter ratio antifungin whisker synthesis method
  • High length-diameter ratio antifungin whisker synthesis method
  • High length-diameter ratio antifungin whisker synthesis method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 233.3 grams of industrial grade MgCl 2 ·6H 2 O and 65 grams of industrial primary boric acid were added to 1560ml of H 2 In O, add 92 grams of NaOH again, stir at 40°C for 50 minutes, let stand and age for 2 hours, filter to obtain 160 grams of magnesium borate whisker precursor, mix the precursor with 32 grams of industrial grade NaCl and 80 grams of Mix industrial grade KCl in solid phase, then add water, the solid-liquid ratio (mass ratio) is 1:0.5, stir evenly at room temperature, filter, put the filtered mixed starting material in a crucible, put it in a high-temperature furnace React at a high temperature of 850°C for 5 hours, take it out after cooling, soak in 200 grams of water, wash, filter, and dry in a drying oven at 80°C for 10 hours to obtain magnesium borate whiskers. The analysis results are shown in Table 1. figure 1 .

Embodiment 2

[0030] 169 grams of industrial grade MgCl 2 ·6H 2 O and 65 grams of industrial primary boric acid were added to 400ml of H 2 Add 169 grams of NaOH to O, stir at 40°C for 30 minutes, let stand and age for 1 hour, and filter to obtain 144 grams of magnesium borate whisker precursor, which is mixed with 120 grams of industrial grade NaCl in solid phase , add the organic solvent that is made up of methanol, ethanol, water again, its proportioning is methanol: ethanol: water=4: 3: 3 (mass ratio), mix, solid-liquid ratio (mass ratio) is 1: 3, under normal temperature Stir evenly, filter, put the filtered mixed starting material in a crucible, put it into a high-temperature furnace and react at 900°C for 10 hours, cool, soak in 200g of water, wash, filter, and dry in a drying oven at 100°C for 3 hour, obtain the magnesium borate whisker product. The analysis results are shown in Table 1. figure 2 .

Embodiment 3

[0032] 325 grams of industrial grade MgCl 2 ·6H 2 O and 65 grams of industrial primary boric acid were added to 500ml of H 2 In O, add 65 grams of NaOH again, stir at 40°C for 30 minutes, let stand and age for 1 hour, filter to obtain 130 grams of magnesium borate whisker precursor, and mix the precursor with 65 grams of industrial grade NaCl and 13 grams of Industrial first-grade KCl solid phase mixing, then add organic solvent composed of methanol, ethanol, water, its proportioning ratio is methanol: ethanol water = 4: 3 (mass ratio), mixed, the solid-liquid ratio (mass ratio) is 1: 0.5, stir evenly at room temperature, filter, put the filtered mixed starting material in a crucible, put it in a high-temperature furnace and react at a high temperature of 500°C for 10 hours, cool, soak in 200g of water, wash, filter, and dry at 100°C Dry in the box for 3 hours to obtain the magnesium borate whisker product. The analysis results are shown in Table 1. figure 2 .

[0033] ...

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Abstract

The invention relates to a process for synthesizing magnesium borate crystal whisker with high length-diameter ratio, which consists of reacting boric acid, magnesium chloride and caustic soda in water solution by right proportion to obtain boracic magnesium compound precipitate, filtering to obtain precursor for magnesium borate crystal whisker production, then mixing fluxing agent comprising NaCl or NaCl and KCl with the precursor, charging menthol, ethanol, water or their mixed solution, immersing, agitating and mixing, subjecting the mixture to high temperature reaction at 500-900 deg C for 5-10 hours, cooling down, washing with water, and finally drying.

Description

technical field [0001] The invention relates to a synthesis method of magnesium borate whiskers Background technique [0002] Magnesium borate whiskers are highly oriented low-dimensional crystals grown in the form of single crystals. They have high strength, high modulus, high wear resistance and excellent corrosion resistance similar to carbon whiskers and silicon carbide whiskers, but Its price is only 1 / 20-1 / 30 of theirs, and it can be widely used as a reinforcing material for magnesium-aluminum-based metals, rubber, plastics, ceramics and other composite materials. [0003] At present, the synthesis process of magnesium borate whiskers mainly adopts the melting method, that is, the raw material boron source boric acid, magnesium source magnesium chloride and fluxing agent sodium chloride, potassium chloride, etc. are mixed with water in a certain proportion, and the powder is obtained by spray drying, and then heated at high temperature. After the melting reaction, was...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B35/12C30B29/62
Inventor 杨建元钟辉
Owner 青海中信国安科技发展有限公司
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