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Organic modified layering silicate and preparation method thereof

An organic silicate and silicate technology, which is applied in chemical instruments and methods, dyeing low-molecular organic compound treatment, fibrous fillers, etc., can solve problems such as difficult organic intercalation and difficult expansion of interlayer spacing, and achieve intercalation High efficiency, expanded application range, and increased interlayer spacing

Inactive Publication Date: 2019-03-12
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when preparing polymer / silicate composites, since the residual negative charge between mica silicate layers is 1, the interlayer K + Cannot be exchanged by other cations, the structure is stable, the interlayer distance is difficult to expand, and it is difficult to carry out organic intercalation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The dried silicate samples were placed in a resistance furnace for 500 oC Calcined for 0.5h; take an appropriate amount of calcined sample, stir and react in 3mol / L nitric acid solution for 2h to obtain acidified silicate; take an appropriate amount of acidified sample, mix it with 12 parts of lithium nitrate for 200 o C reacted for 8h to obtain lithium-based silicate; add lithium-based layered silicate in water to form a stable suspension; add the acidified organic intercalation agent to the suspension of lithium-based layered silicate at 120 o C under reaction 8h. The resulting aqueous organosilicate solution is purified to obtain an organomodified silicate. The X-ray diffraction (XRD) test results of the obtained organically modified sericite showed that the interlayer distance increased from 1.98 nanometers to 5.3 nanometers.

Embodiment 2

[0028] The dried silicate samples were placed in a resistance furnace for 500 oC Calcined for 0.5h; take an appropriate amount of calcined sample, stir and react in 3mol / L nitric acid solution for 2h to obtain acidified silicate; take an appropriate amount of acidified sample, mix it with 12 parts of lithium nitrate for 200 o C reacted for 8h to obtain lithium-based silicate; add lithium-based layered silicate in water to form a stable suspension; add the acidified organic intercalation agent to the suspension of lithium-based layered silicate at 150 o C under reaction 8h. The resulting aqueous organosilicate solution is purified to obtain an organomodified silicate. The X-ray diffraction (XRD) test results of the obtained organically modified sericite showed that the interlayer distance increased from 1.98 nanometers to 5.52 nanometers.

Embodiment 3

[0030] The dried silicate samples were placed in a resistance furnace for 500 oC Calcined for 0.5h; take an appropriate amount of calcined sample, stir and react in 3mol / L nitric acid solution for 2h to obtain acidified silicate; take an appropriate amount of acidified sample, mix it with 12 parts of lithium nitrate for 200 o C reacted for 8h to obtain lithium-based silicate; add lithium-based layered silicate in water to form a stable suspension; add the acidified organic intercalation agent to the suspension of lithium-based layered silicate at 120 o C under reaction 8h. The resulting aqueous organosilicate solution is purified to obtain an organomodified silicate. The X-ray diffraction (XRD) test results of the obtained organically modified sericite showed that the interlayer distance increased from 1.98 nanometers to 5.54 nanometers.

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Abstract

The invention relates to a preparation method of organic silicate. The method comprises the following steps: pretreating the silicate by adopting a comprehensive means of heat activation, acid treatment and lithium nitrate intercalation modification to obtain lithium-based silicate, performing intercalation reaction for an organic intercalation agent and lithium-based montmorillonoid in a solventat the temperature of 80 to 180 DEG C, then purifying an organic silicate aqueous solution to obtain the organic modified silicate. The organic intercalation agent is an organic compound shown in thestructural general formula of R(CH2)12 to 18N(CH3)3R, and the R in the general formula is chlorine atoms or bromine atoms. The layered silicate is white mica subtribe and black mica subtribe and comprises sodium mica, white mica, glauconite, gold mica, black mica, iron-lithium mica and lithium mica. By adopting the method of the invention, in the preparation process, not only can the effective swelling of a space among silicate layers be realized, but also the active functional group is introduced among the layered silicate layers, the obtained organic modified layered silicate is loose, easyto break, suitable for a high-temperature polyimide adhesive / layered silicate nano composite material, and wide in application prospect.

Description

technical field [0001] The invention relates to the technical field of silicate modification, and specifically provides an organically modified layered silicate and a preparation method thereof. Background technique [0002] Organically modified phyllosilicates refer to the use of organic reagents to treat phyllosilicates to cause physical adsorption or chemical combination with phyllosilicates to form substances with organic properties. Since most organically modified phyllosilicates are obtained through ion exchange processes, most of the phyllosilicates used to form organically modified have certain ion exchange capabilities, such as montmorillonite, saponite, vermiculite, mica etc. In recent years, organically modified layered silicates have been widely used in the field of polyimide adhesive / layered silicate nanocomposites. The properties of organically modified layered silicates have a decisive influence on the formation of nanocomposites. Organically modified phyll...

Claims

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Application Information

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IPC IPC(8): C09C1/30C09C1/40C09C3/06C09C3/08C09J179/08C09J11/04
CPCC01P2002/08C01P2006/22C08K3/34C08K9/00C08K9/02C08K9/04C08K2201/011C09C1/309C09C1/405C09C3/006C09C3/06C09C3/08C09J11/04C09J179/08
Inventor 李笃信魏梦玲张起
Owner CENT SOUTH UNIV
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