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

A technology of 16CO3·4H2O and magnesium aluminum hydrotalcite, which is applied in the direction of single crystal growth, crystal growth, single crystal growth, etc., can solve the problems of increasing the complexity of the preparation process and preparation cost, long cycle time, and high baseline, and achieves favorable Protection of the environment and human health, avoidance of autoclave requirements, effect of uniform grain size

CN101187060AActive Publication Date: 2008-05-28XIDIAN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2008-05-28

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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.
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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...

Examples

preparation example Construction

[0098] According to the typical process flow of the liquid phase co-precipitation method for preparing magnesium aluminum hydrotalcite shown in Figure 3, the steps for preparing magnesium aluminum hydrotalcite are:

[0099] In the first step, according to the moles of each component, the moles of crystalline magnesium chloride and sodium hydroxide are dissolved in deionized water, and heated in reactor 1 for 2 to 5 minutes while stirring; the amount of deionized water added is based on the prepared The amount of magnesium aluminum hydrotalcite depends on the requirements, generally greater than 500mL; if the reaction aqueous solution is too small, the distance between the "stirrer 4" in the stirring while heating in Figure 2 is too close to the bottom of the reaction vessel, and it is easy to rub against the bottom of the stainless steel vessel. Reaction temperature: 100°C;

[0100] In the second step, while heating while stirring, aluminum salt and sodium carbonate are added ...