Preparation method of exfoliated mica using sol-gel hydrolysis condensation to complete chemical modification

Abstract

The invention relates to a preparation method in which delaminated mica uses sol gel hydrolytic condensation to complete chemical modification. The method includes: mica powder and a basic solvent are mixed in a high-temperature high-pressure environment to perform ion substitution; mica that completes ion substitution is filtered and collected and cleaned with deionized water, and is then placed in a deionized water solution; a pH value is adjusted to be smaller than 6, the mica completes delamination and is fully dispersed in a water solution, and the water solution present a completely transparent state at the moment; the mica water solution is directly used to perform sol gel reaction to intercalate organic molecules in the mica, after the sol gel reaction is finished, the pH value of a reactant is adjusted to be larger than 7, precipitated mica is filtered and cleaned, and finally a product is obtained by drying. The preparation method mixes a basic solution with mica obtained in the high-temperature high-pressure environment and the mica can realize delamination and complete dispersion in the water solution whose pH is smaller than 6, thereby facilitating organic surface modification and intercalation of mice by a sol-gel method.

Description

technical field [0001] The present invention relates to a preparation method of chemically modified mica, in particular to a method for preparing mica chemically modified by using a sol-gel hydrolysis condensation method after a highly ion-replaced mica is peeled off in an acidic solution and completely dispersed Background technique [0002] It is known that many literatures and studies have pointed out that using hydrothermal method or molten salt method to replace mica with interlayer cations can weaken the bonding force between mica layers. Generally, lithium nitrate or sodium hydroxide is used as ion replacement agent in research. Lithium nitrate is expensive because of its high ion exchange temperature and long reaction time between lithium nitrate and mica, so sodium hydroxide is more often used, its reaction is faster and the price of sodium hydroxide is also cheaper. [0003] Taiwan Invention Patent Announcement No. I312338 "A Method for Making Mica Swellable in Aci...

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Problems solved by technology

However, most of the mica produced by this known patent has not been organically modified, and has poor affinity with general organic matter, and mica has the problem of poor dispersion when applied.

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