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Large interlamellar spacing and high activity modified calcium-base montmorillonite and preparation method thereof

A technology of montmorillonite, interlayer spacing, applied in chemical instruments and methods, inorganic pigment treatment, fibrous fillers, etc.

Active Publication Date: 2007-10-24
ZHUZHOU TIMES NEW MATERIALS TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The methods reported in the literature and patents seldom mention the improvement of the reactivity of montmorillonite itself, and its effect on materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A modified calcium-based montmorillonite with large layer spacing and high activity, the layer spacing of the modified montmorillonite is 4.90nm. The production method is as follows:

[0024] (1) Preparation of acidic modification solution: 100 parts of concentrated hydrochloric acid are completely dispersed and dissolved in 100 parts of water to obtain 200 parts of acidic aqueous solution, and the acidic modification solution is obtained after stirring and mixing;

[0025] (2) Addition of montmorillonite: according to the ratio of adding 100 parts of acidic modification solution to 200 parts of calcium-based montmorillonite, add powdered calcium-based montmorillonite to the above acid solution, and heat Stir at high speed for 2 hours, weigh hot filter, and wash with acid and water until neutral. The interlayer spacing of modified montmorillonite was 4.90nm by XRD test.

Embodiment 2

[0027] A modified calcium-based montmorillonite with large interlayer spacing and high activity, the interlayer spacing of the modified montmorillonite is 7.42nm. The production method is as follows:

[0028] (1) Preparation of acidic modification solution: 100 parts of concentrated sulfuric acid are completely dispersed and dissolved in 50 parts of water to obtain 150 parts of acidic aqueous solution, and the acidic modification solution is obtained after stirring and mixing;

[0029] (2) Addition of montmorillonite: according to the ratio of adding 100 parts of acidic modification liquid to 300 parts of calcium-based montmorillonite, add powdered calcium-based montmorillonite to the above acid solution, and the Stir at high speed for 3 hours, weigh hot filter, and wash with acid and water until neutral. The interlayer spacing of modified montmorillonite was 7.42nm by XRD test.

Embodiment 3

[0031] A modified sodium-based montmorillonite with large interlayer spacing and high activity, the interlayer spacing of the modified montmorillonite is 3.14nm. The production method is as follows:

[0032] (1) Preparation of acidic modification solution: 100 parts of concentrated acrylic acid are completely dispersed and dissolved in 200 parts of water to obtain 300 parts of acidic aqueous solution, and the acidic modification solution is obtained after stirring and mixing;

[0033] (2) Addition of montmorillonite: according to the ratio of adding 100 parts of sodium montmorillonite to 100 parts of acidic modification solution, add powdered sodium montmorillonite to the above acid solution, After stirring at high speed for 0.5 hours, filter and wash with acid and water until neutral. The interlayer spacing of modified montmorillonite was 3.14nm by XRD test.

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Abstract

The invention discloses a large-layer distance and high-property modified calcium-based montmorillonite and making method, wherein the maximum layer distance of the modified montmorillonite is 1. 4nm-7. 42nm. The manufacturing method of the modified montmorillonite is characterized by the following: adopting acid solution as disperser; making the layer of montmorillonite striped through solventing action of water under certain temperature; activating Si-O-Si bond on the surface of montmorillonite to generate Si-OH; obtaining the product. The specific making method comprises the following steps: (1) allocating the modifying solution through acid and water with weight rate at 1:0. 5-2; stirring and blending to form the acid dispersing liquid; (2) adding montmorillonite; allocating the acid dispersing liquid and powder-shaped montmorillonite with weight rate at 1:1-3; adding the composition into the dispersing liquid batch by batch; heating to 30-90 deg. c; stirring 0. 5-3h; cooling; filtering; washing to neutral through water; obtaining the product.

Description

technical field [0001] The invention provides a modified calcium-based montmorillonite with large layer spacing and high activity, which can be mainly used as an auxiliary filler for polymer materials, and can make the obtained polymer materials have better physical and mechanical properties and anti-aging properties . Background technique [0002] Montmorillonite (MMT) belongs to the 2:1 type layered silicate, which is a kind of layered clay composed of nanometer-thick surface negatively charged silicate sheets relying on the electrostatic interaction between layers (such as Shown in accompanying drawing 1). The interlayer distance of untreated calcium-based and sodium-based montmorillonite is generally 1.2-1.4nm. When compounding with polymers, such interlayer spacing is not conducive to the entry of polymers into montmorillonite, because montmorillonite has The lamellar structure is different from traditional spherical reinforcing materials (carbon black, white carbon b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/28C09C3/06
Inventor 金焱王进杨军徐坚
Owner ZHUZHOU TIMES NEW MATERIALS TECH
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