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Anionic-cationic composite intercalation type organic montmorillonite material and preparation method thereof

An organic montmorillonite and composite intercalation technology, applied in chemical instruments and methods, inorganic chemistry, silicon compounds, etc., can solve the problems of cumbersome process route, poor product stability, complex preparation process, etc. High stability and high degree of peeling effect

Active Publication Date: 2011-11-16
CHINA UNIV OF GEOSCIENCES (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation process is relatively complicated, and the conditions are difficult to control because of the polymerization reaction, and the product has a single use
[0014] In the above process, either due to improper selection of organic modifiers, or due to cumbersome process routes, or due to poor product stability and poor performance, it is difficult to realize industrial production
[0015] In addition, there is currently no preparation method and method for intercalating montmorillonite with cationic surfactants and anionic surfactants to modify montmorillonite to obtain a cationic-anionic composite intercalation type organic montmorillonite with a high-level spacing. report on performance characteristics

Method used

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  • Anionic-cationic composite intercalation type organic montmorillonite material and preparation method thereof
  • Anionic-cationic composite intercalation type organic montmorillonite material and preparation method thereof
  • Anionic-cationic composite intercalation type organic montmorillonite material and preparation method thereof

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preparation example Construction

[0031] The present invention provides a method for preparing cation-anion composite intercalation type organic montmorillonite, which includes the following steps:

[0032] A. Purified montmorillonite: Purify natural calcium-based montmorillonite;

[0033] B. Hydration treatment of montmorillonite: the purified montmorillonite is made into an aqueous suspension, and the hydration treatment is carried out by means of mechanical stirring and ultrasonic mixing;

[0034] C. Preparation of cation-anion composite intercalation type organic montmorillonite material: the fully hydrated montmorillonite hydration liquid is marked as liquid A, the organic cationic surfactant is added to liquid A and ultrasonic dispersion is performed, Subsequent mechanical stirring is followed to obtain liquid B, and then the anionic surfactant is added to liquid B and the machine is used for ultrasonic dispersion, followed by mechanical stirring, standing at a constant temperature, separation and drying to obt...

Embodiment 1

[0074] Example 1 Purification of Montmorillonite

[0075] ① Crush the calcium-based montmorillonite ore with a ball mill and pass through a 200-mesh sieve to obtain montmorillonite powder;

[0076] ②Weigh 80g of montmorillonite powder and dissolve it in 8L of distilled water (packed in a bucket), stir with an electric stirrer for 20 minutes, prepare the montmorillonite into a suspension with a "concentration" not exceeding 10g / L, and continue to stand still at room temperature. Leave it for 8 hours and take out the part with a height of <10cm with a siphon;

[0077] ③ Take the upper 10cm suspension, centrifuge, and vacuum dry (70℃) to obtain refined montmorillonite;

[0078] ④Add distilled water again to the remaining part, restore the volume to the original volume and continue stirring for 20 minutes to disperse the particles larger than 2μm that are not "disassembled", and then take them out after 8 hours. Repeat this several times until the remaining part is re-added with distill...

Embodiment 2

[0079] Example 2 Preparation of cation-anion composite intercalation type organic montmorillonite

[0080] Add 5 g of calcium-based montmorillonite with a cation exchange capacity of 88 meq / 100g and a particle size of 200 mesh sieve obtained in Example 1 into a three-necked flask containing 100 ml of water, and hydrate with ultrasonic and mechanical stirring. One hour is recorded as A solution, 3g cetyltrimethylammonium bromide is slowly added to A solution, after 10 minutes of ultrasonic dispersion, the ultrasonic is stopped, and the mechanical stirring is continued for 2 hours, then 1.8g of dodecyl sulfonic acid is added Sodium is turned on and ultrasonic for 10 minutes and mechanical stirring is continued for 1 hour. The stirring is stopped, cooled to room temperature and centrifuged. The sample is washed once with deionized water, dried in a drying oven at 80°C for several hours, and ground to pass a 200 mesh sieve. The cation-anion composite intercalation type organic montm...

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Abstract

The invention discloses anionic-cationic composite intercalation type organic montmorillonite and a preparation method thereof. The method comprises the following steps: purifying Ca-montmorillonite; performing hydration treatment on the Ca-montmorillonite, namely using the purified Ca-montmorillonite to prepare an aqueous suspension and adopting a way of combining mechanical agitation and ultrasonic action to perform hydration treatment; and preparing the anionic-cationic composite intercalation type organic montmorillonite material, namely using an organic cationic surfactant and an anionicsurfactant to perform intercalation on the montmorillonite in turn under the actions of ultrasonic dispersion and mechanical agitation. The spacing of montmorillonite layers is up to more than 5.2nm;the material provided by the invention has the advantages of high thermal stability, high peeling degree and excellent performance, and can be dispersed evenly in an organic phase; and the montmorillonite material used as a filler with excellent performance can be used in the field of preparation of macromolecular nanocomposites.

Description

Technical field [0001] The invention relates to a new process for the organic modification of montmorillonite, and more specifically to a cation-anion composite intercalation type organic montmorillonite and a preparation method thereof. Through the method provided by the invention, cationic and anionic surfactants are used to composite intercalation modified montmorillonite, which can prepare organic montmorillonite with high-level spacing and high performance. Background technique [0002] Montmorillonite is a layered aluminosilicate mineral containing water. It is composed of two silicon-oxygen tetrahedrons with a chloroaluminum (magnesium) oxygen (hydrogen oxygen) octahedron. The interlayer spacing is about 0.96nm. Exchangeable Na + , Ca 2+ , Mg 2+ It can be exchanged with other cations. [0003] Organic montmorillonite has a wide range of uses, and has been used in lubricating grease, paint, ink, cosmetics, medicine and health, environmental management, food and defense indus...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/44
Inventor 张泽朋张吉初廖立兵杜高翔
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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