Preparation method for composite material of nano-concave-convex stick stone/silicon dioxide

A technology of nano attapulgite and silicon dioxide, which is applied in the deep processing field of non-metallic minerals, can solve the problems of restricting industrial production and wide application, the reinforcement effect is not as good as that of fibrous materials, and the production process is complicated, so as to achieve economic benefits and social benefits. Remarkable benefit, good reinforcing effect, simple preparation process

Inactive Publication Date: 2009-02-18
JIANGSU POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Use non-metallic ore to produce white carbon black, but it consumes a lot of concentrated acid and alkali, the production process is complicated, the yield of the obtained powder is low, and the cost is high
[0003] In addition, due to the spherical shape of silica particles, the reinforcing effect is not as good as that of fibrous materials.
Studies have shown that fibrous inorganic materials have the best reinforcing effect in polymers, but at present, foreign fibrous inorganic materials (potassium titanate whiskers, zinc oxide whiskers, fibrous titanium dioxide) are all artificially synthesized, and the manufacturing cost Very high, which limits its large-scale industrial production and wide application

Method used

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  • Preparation method for composite material of nano-concave-convex stick stone/silicon dioxide
  • Preparation method for composite material of nano-concave-convex stick stone/silicon dioxide
  • Preparation method for composite material of nano-concave-convex stick stone/silicon dioxide

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Experimental program
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Effect test

Embodiment 1

[0026] Attapulgite was added to deionized water to prepare 1000 kg of a suspension with a solid content of 5% (mass percentage, the same below), and placed in a 3000L stirred enamel reaction kettle. Start the stirring device, add 20% (mass percentage, the same below) sodium silicate solution 1183kg in the reactor, the consumption of sodium silicate is m (SiO 2 ):m (attapulgite)=1:1. Maintain the reaction temperature at 70°C, add 10% sulfuric acid solution, adjust the pH value of the attapulgite suspension to 10.0, mature for 0.5h, then adjust the pH value of the system to 6.0 with 10% sulfuric acid solution, continue stirring, and mature 24h. Filtrate, wash with deionized water to remove soluble salts, dry, and airflow pulverize to obtain nano attapulgite / silicon dioxide composite material. TEM photos such as figure 2 , the whiteness of the nano-attapulgite / silica composite is 90.

Embodiment 2

[0028] Attapulgite was added to deionized water to prepare 1000kg of a suspension with a solid content of 5%, and placed in a 3000L stirred enamel reaction kettle. Start the stirring device, maintain the reaction temperature of the system at 70°C, add dropwise 20% sodium silicate solution and 10% sulfuric acid solution respectively in the reactor, maintain the system pH=10.0, and the consumption of the sodium silicate solution is 1183kg, i.e. m(SiO 2 ):m (attapulgite)=1:1. After adding the sodium silicate solution, mature for 0.5h, then adjust the pH of the system to 6.0 with 10% sulfuric acid solution, continue stirring, and mature for 24h. Filtrate, wash with deionized water to remove soluble salts, dry, and airflow pulverize to obtain nano attapulgite / silicon dioxide composite material. TEM photos such as image 3 , the whiteness of the nano-attapulgite / silica composite is 91.

Embodiment 3

[0030] Add attapulgite to deionized water to prepare 500 kg of a suspension with a solid content of 2%, and place it in a 3000L enamel reaction kettle with stirring. Start stirring device, add 10% sodium silicate solution 1419kg in the suspension, the consumption of sodium silicate is m (SiO 2 ):m (attapulgite)=3:1. Maintain the reaction temperature at 50°C, add 3% hydrochloric acid solution, adjust the pH value of the attapulgite suspension to 8.0, mature for 2 hours, then adjust the pH value of the system to 7.0 with 3% hydrochloric acid solution, continue stirring, and mature for 12 hours. Filtrate, wash with deionized water to remove soluble salts, dry, and airflow pulverize to obtain nano attapulgite / silicon dioxide composite material. The whiteness of nano-attapulgite / silica composite is 93.

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Abstract

The invention discloses a method for preparing nano attapulgite/silicon dioxide composite materials. Firstly, attapulgite is added into de-ionized water to prepare suspension liquid containing 2-20 percent of solid; secondly, sodium silicate solution (mass concentration: 5-30 percent) and acid solution (mass concentration: 3-30 percent) are prepared; finally, the achieved nano attapulgite/silicon dioxide composite materials are filtered, the soluble salt is repeatedly washed by de-ionized water, dried and porphyrized. On the precondition that the clavated structure of the nano attapulgite is not damaged, the method adopts chemical precipitation to generate nano granular silicon dioxide in situ in the nano attapulgite dispersed liquid, and a spherical-clavated composite reinforcing material is prepared, thereby, the surface properties of the attapulgite is changed, the brightness of the nano attapulgite is improved, and the field of attapulgite minerals deep-processing and comprehensive utilization is expanded; the preparation process is simple and the production cost is relatively low.

Description

technical field [0001] The invention relates to the field of deep processing of non-metallic minerals and the technical field of inorganic chemical industry, in particular to a method for in-situ generation of silicon dioxide on the surface of nano attapulgite. Background technique [0002] Precipitated silica is an important reinforcing material in the rubber industry, mainly used in footwear, tires and other light-colored rubber products. Precipitated silica is produced by reacting water glass with sulfuric acid, hydrochloric acid or carbon dioxide as raw material. Due to the consumption of a large amount of chemical raw materials in the preparation process, the cost of the product remains high. In order to reduce costs, non-metallic minerals are used as raw materials to produce white carbon black. The process route is usually to first produce water glass from non-metallic minerals, and then produce white carbon black from water glass. For example: Chinese patent ZL95102...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08K7/10C08K3/36C08L21/00
Inventor 姚超张国庆曾永斌陈志刚丁永红李为民王茂华
Owner JIANGSU POLYTECHNIC UNIVERSITY
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