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Organic surface modifying method of attapulgite

A technology of attapulgite and surface modification, which is applied in the treatment of dyed organosilicon compounds and fibrous fillers. It can solve the problems of poor hydrophobicity of attapulgite, unsatisfactory modification effect, and inability to completely float on the water surface. Hydrophobicity, the effect of improving hydrophobicity

Inactive Publication Date: 2008-06-11
JIANGSU NDZ TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the above method only utilizes one aspect of the surface properties of attapulgite for organic surface modification, the modification effect is not ideal
Macroscopically, the modified attapulgite has poor hydrophobicity and cannot completely float on the water surface

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] First, add 5 g of attapulgite powder to 50 g of deionized water, and stir to prepare attapulgite suspension. Heat the attapulgite suspension to 90°C, add 0.1 g of octadecyltrimethylammonium bromide, maintain the reaction temperature at 90°C, and stir for 2 hours. Then add glacial acetic acid to adjust the pH of the system to 3, then add 1 g of γ-methacryloxypropyltrimethoxysilane, and continue to stir and react at 90° C. for 3 h. Suction filter the attapulgite suspension after the surface modification reaction, and wash with deionized water and absolute ethanol three times respectively. Finally, dry it in an oven at 110°C and pulverize it to obtain the attapulgite powder after organic surface modification with octadecyltrimethylammonium bromide and γ-methacryloxypropyltrimethoxysilane . The activation index H of the obtained powder was 100%.

Embodiment 2

[0021] First, add 5 g of attapulgite powder to 100 g of deionized water, and stir to prepare attapulgite suspension. Adjust the temperature of the attapulgite suspension to 20°C, add 0.2g of cetyltrimethylammonium chloride, maintain the reaction temperature at 20°C, and stir for 10 hours. Then add 2 mol / L ammonia solution to adjust the pH of the system to 8, then add 0.25 g of methyltrimethoxysilane, and continue to stir and react at 20° C. for 24 h. Suction filter the attapulgite suspension after the surface modification reaction, and wash with deionized water and absolute ethanol three times respectively. Finally, it is dried in an oven at 110° C. and pulverized to obtain the attapulgite powder after organic surface modification with cetyltrimethylammonium chloride and methyltrimethoxysilane. The activation index H of the obtained powder was 100%.

Embodiment 3

[0027] First, add 10 g of attapulgite powder to 50 g of deionized water, and stir to prepare attapulgite suspension. Heat the attapulgite suspension to 90°C, add 0.5g of dodecyltrimethylammonium bromide, maintain the reaction temperature at 90°C, and stir for 6h. Then add glacial acetic acid to adjust the pH of the system to 5, then add 1.5 g of n-octyltrimethoxysilane, and continue to stir and react at 90° C. for 4 h. Suction filter the attapulgite suspension after the surface modification reaction, and wash with deionized water and absolute ethanol three times respectively. Finally, it is dried in an oven at 110° C. and pulverized to obtain the attapulgite powder after organic surface modification with dodecyltrimethylammonium bromide and n-octyltrimethoxysilane. The activation index H of the obtained powder was 100%.

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Abstract

The invention relates to a modification method of the organic surface of attapulgite. The process steps are as follows: the attapulgite powder is added into deionized water according to certain proportion, so as to produce attapulgite suspendion liquid, and the attapulgite mass occupies 5 percent to 25 percent of the water mass; the temperature of the attapulgite suspendion liquid is adjusted to be 20 to 90 DEG C, cationic surface active agent is added, the cationic surface active agent quality is 2 to 10 percent of the attapulgite quality, and stirring and reaction are perfromed for 2 to 10 h; after the organic surface modification of the cationic surface active agent is accomplished, the pH value of the system is adjusted to be 3 to 3 or 8 to 11, silane coupling agent is added into the reaction system, the silane coupling agent mass occupies 5 to 20 percent of the attapulgite mass, and the the silane coupling agent is stirred and reacted for 3 to 24 h below 20 to 90 DEG C; the obtained attapulgite pulp is filtered, washed, dried and crushed, and finally the attapulgite powder modified through combing the cationic surface active agent with the silane coupling agent is obtained. Through the cationic surface active agent and the silane coupling agent to perform the organic surface modification to the attapulgite together, the organic surface modification effect is greatly improved.

Description

technical field [0001] The invention relates to a method for organic surface modification of attapulgite, in particular to a new method for organically modifying attapulgite with the cooperation of cationic surfactant and silane coupling agent. Background technique [0002] Attapulgite is a natural nano-layered chain silicate with a fibrous crystal structure and a large aspect ratio. Its structural characteristics belong to one-dimensional nanomaterials, and it is an ideal reinforcing material for polymer materials. The surface of attapulgite is hydrophilic, so it is only suitable for use in polar systems. However, it is difficult to disperse when added to organic systems such as plastics, rubber, chemical fibers, and solvent-based coatings, and cannot reflect the special functions of attapulgite. In order to improve the compatibility and dispersibility of attapulgite in organic systems and improve the performance of the composite system with nano attapulgite, organic surfa...

Claims

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Application Information

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IPC IPC(8): C09C3/12C09C1/28
Inventor 姚超张国庆陈志刚刘建平李为民王茂华马江权高国生
Owner JIANGSU NDZ TECH
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