Microwave method for peeling laminar inorganic material quickly

Abstract

The invention relates to a method for peeling a laminar inorganic material quickly. The method comprises the following steps of: firstly, preparing laminar inorganic intercalating composite of the laminar inorganic material; secondly, decomposing or evaporating the inter-laminar organic material of the organic intercalating composite solid of the laminar inorganic material in a short time in the presence of microwaves and allowing the inter-laminar organic material to escape from the space between the layers of the laminar inorganic material so as to quickly peal the laminar inorganic material; and finally, performing separation, washing, drying and grinding to obtain the products. The method not only can peal the laminar inorganic material in a short time but also keep a good crystal structure of the laminar inorganic material, so the application of the laminar inorganic material is substantially widened and the use value thereof is multiplied.

Description

Technical field: [0001] The invention relates to a quick method for peeling off layered inorganic materials, which belongs to the field of preparation of inorganic ultrafine sheet materials. Background technique: [0002] Microwave is an electromagnetic wave with extremely high frequency (300MHz-300GHz) and very short wavelength (usually 1mm-0.1m). As a new technology, microwave heating has many advantages that other heating methods cannot match, including cleanliness, high efficiency, low energy consumption, and low pollution. With the development of microwave radiation technology, its application has expanded from the traditional military and communication fields to many fields such as industry, agriculture, biopharmaceuticals, and preparation of new materials, and has been widely used in various fields and branches of chemistry. Using the "internal heating" effect of microwaves, the heated object can generate heat at different depths at the same time. This method has the...

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Problems solved by technology

[0004] The peeling technology of layered inorganic materials includes mechanical grinding peeling method and chemical peeling method. The disadvantage of relying on mechanical grinding method alone is that excessive grinding will destroy the crystal structure of inorganic materials, resulting in poor product performance. At the same time, the mechanical method consumes more energy. Large; the principle of chemical exfoliation is to use intercalation to expand the interlayer of layered inorganic materials, and the bonding force is greatly weakened. Inorganic materials to achieve the purpose of natural peeling

Tsunematasu et al. used the grinding method to exfoliate the kaolin-urea intercalation compound, but the formed particles were in the micron and submicron scales, and could not reach the nanoscale, and most of them became aggregates of amorphous particles, destroying the high The original crystal structure of ridge stone; because ultrasonic waves can generate local ultra-high temperature and ultra-high pressure, and ultrasonic cavitation produces high cavitation energy, resulting in violent collisions between particles on the solid surface, reducing the particle size, Franco et al. Ultrasonic treatment of the mixture of water and kaolin can achieve a good peeling effect and maintain a good crystal structure, but it takes a long time and is difficult to achieve industrial production

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