Needle, flake-shaped nano single crystal mg-al hydrotalcite Mg8Al2(OH)16CO3 4H2O preparation method

Abstract

The invention discloses a process for preparing acicular, flake nano single crystal magnesia-alumina hydrotalcite Mg6Al2(OH)16C.4H2O, and the prepared Mg6Al2(OH)16CO3.4H2O is used as a flame retardant of power electronic devices. Acicular components comprise 0.06-1.41 mol/L crystal magnesium chloride, 0.02-0.47 mol/L aluminum salt, 0.3-4.5 mol/L sodium hydroxide and 0.094-1.368 mol/L sodium carbonate, and flake components are added with modifier basing on the above components. The invention has the process steps that the crystal magnesium chloride and the sodium hydroxide are firstly dissolved in deionized water and heated and stirred, and then the aluminum salt and sodium carbonate are added into the solution, the deionized water and the sodium hydroxide are added every 20 minutes during reaction, the time of reaction is 0.5-2 hours, and the solution is cooled until room temperature and is washed, filtered and dried. The crystal morphology of the prepared acicular nano single crystal magnesia-alumina hydrotalcite is that the diameter is 10-20 nanometer, the length is 60-130 nanometer, the diameter is 25-80 nanometer, and the length is 200-500 nanometer. The crystal morphology of the flake nano single crystal magnesia-alumina hydrotalcite is that the thickness is 10-20 nanometer, the diameter is 50-100 nanometer, the thickness is 20-30 nanometer, and the diameter is 60-200 nanometer. The process for preparation of the invention has short period and simple process, is prepared at atmospheric pressure, and is suitable for industrial production.

Description

technical field [0001] The invention belongs to the technical field of chemical materials, and more specifically, the invention relates to a needle-like and sheet-like nano single crystal magnesium aluminum hydrotalcite Mg 6 al 2 (OH) 16 CO 3 4H 2 The preparation method of O, the magnesium-aluminum hydrotalcite prepared by this method is used as a flame retardant for sheaths or shells of power cables, electronic equipment, electrical equipment, etc., and as a flame retardant for occasions such as suspended ceilings for interior decoration. Background technique [0002] Fire prevention is a theme of modern social security. With the advancement and development of science and technology and the improvement of people's living standards, polymer materials such as plastics, rubber, and synthetic fibers have been widely used in construction, transportation, electrical equipment, aerospace, mining, daily furniture, and daily necessities. every aspect. Most of these polymer mat...

AI Technical Summary

Problems solved by technology

If the activity of the fired magnesium oxide is not good, even magnesium aluminum hydrotalcite cannot be prepared;

[0014] 2) A suitable sintering furnace must be equipped for firing magnesia

[0023] 2) prepare intermediate product basic magnesium chloride Mg 3 (OH) 2 Cl 4H 2 The cycle of O crystal is longer, it takes three days, and Mg should be controlled within three days 3 (OH) 2 Cl 4H 2 O crystallization temperature (room temperature), air humidity, etc., will take up a certain amount of preparation equipment and the space of the preparation room, which relatively increases the complexity and preparation cost of the entire preparation process.

[0031] 1) The main device "three-neck round-bottom flask" is a fragile glass vessel, which is used in conjunction with the "electric mixer", which increases the complexity and danger of the entire preparation process;

[0032] 2) "reflux crystallization" is required, which makes the whole preparation process time-consuming and laborious

[0034] 3) XRD analysis shows that the baseline of the aluminum hydrotalcite XRD pattern obtained by the double drop method is relatively high, indicating that the crystallinity of the obtained magnesium aluminum hydrotalcite product is relatively poor

Thereby seriously affecting the purity of the prepared magnesium aluminum hydrotalcite

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