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Hydrophobic modification method of silica gel under effect of ultrasonic waves

An ultrasonic and hydrophobic technology, applied in chemical instruments and methods, other chemical processes, etc., to achieve the effects of improving hydrophobicity and the ability to adsorb organic substances, wide source of raw materials, and simple operation

Inactive Publication Date: 2016-07-20
CHANGZHOU UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there have been no reports on the preparation of hydrophobic silica gel with better hydrophobicity and superior adsorption performance by using ordinary water-absorbing fine-pore silica gel particles as raw materials and modifying them with trimethylchlorosilane combined with ultrasonic treatment.

Method used

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  • Hydrophobic modification method of silica gel under effect of ultrasonic waves
  • Hydrophobic modification method of silica gel under effect of ultrasonic waves
  • Hydrophobic modification method of silica gel under effect of ultrasonic waves

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] (1) Put 10 g of ordinary water-absorbing fine-pore silica gel particles into a petri dish and place them in a vacuum drying oven with a set temperature of 100°C and a vacuum drying time of 4 hours to obtain silica gel after heat removal and pretreatment.

[0018] (2) Measure 75mL of n-heptane into a three-necked flask, then add 5mL of ethanol into the three-necked flask, mix well, then add 5mL of trimethylchlorosilane into the three-necked flask to prepare the required silane modifier.

[0019] (3) Add the silica gel treated in the above step 1 to the silane modifier prepared in the above step 2, impregnate at a temperature of 70°C for 10 hours (a condensation reflux device is provided during the impregnation process), filter, and use n-heptane Clean the residual silane modifier, then filter, repeat several times until there is no silane modifier in the filtrate, and then dry the modified silica gel in a vacuum oven at 80°C for 24 hours to remove n-heptane adsorbed on th...

Embodiment 2

[0021] (1) Put 10 g of ordinary water-absorbing fine-pore silica gel particles into a petri dish and place them in a vacuum drying oven with a set temperature of 100°C and a vacuum drying time of 4 hours to obtain silica gel after heat removal and pretreatment.

[0022] (2) Measure 75mL of n-heptane into a three-necked flask, then add 5mL of ethanol into the three-necked flask, mix well, then add 5mL of trimethylchlorosilane into the three-necked flask to prepare the required silane modifier.

[0023] (3) Add the silica gel treated in the above step 1 to the silane modifier prepared in the above step 2, impregnate at a temperature of 70°C for 1 hour, and then act at the same time for 10 minutes at an ultrasonic power of 500W at a temperature of 70°C, and then continue Immersion, so that the total time of immersion reaches 10h (a condensing reflux device is provided during the immersion process), then filter, and wash the residual silane modifier with n-heptane, then filter, rep...

Embodiment 3

[0025] In Example 2, the contents of Step 1 and Step 2 remained unchanged, and in Step 3, only the ultrasonic power was changed to 500 W for 20 minutes at the same time to obtain hydrophobic silica gel 3.

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Abstract

The invention relates to a hydrophobic modification method of silica gel under the effect of ultrasonic waves. The hydrophobic modification method comprises the following steps: firstly performing vacuum drying and impurity elimination on common silica gel particles sold in the market, and then uniformly mixing normal heptane with ethanol and trimethyl chlorosilane according to a certain proportion in a three-neck flask so as to obtain a silane modifying agent; impregnating the silica gel particles after the operations of drying and impurity elimination in the silane modifying agent, and at the same time, modifying the silica gel under the effect of the ultrasonic waves so as to obtain lyophobic silica gel with good hydrophobic effects and good adsorption properties.

Description

technical field [0001] The invention belongs to the field of new material preparation, and in particular relates to a preparation method of hydrophobic silica gel. Background technique [0002] Silica gel is a polymer composed of silicon-oxygen compounds. Its surface contains about 5% of hydroxyl groups. It is very easy to combine with water molecules. It can absorb up to 50% of its own mass of water. It is usually used as a desiccant, but it is difficult to adsorb non-polar Therefore, it is often used to treat gases with high moisture content and dry and dehydrate them. Hydrophilicity is a remarkable characteristic of silica gel. However, the hydrophilicity of silica gel often affects its adsorption performance, and it is easy to produce adsorption competition, so that the adsorbed organic vapor is replaced by water molecules, and after absorbing excess water molecules, Due to the expansion force will destroy the rigid structure of silica gel, resulting in broken. However...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/22B01J20/30B01J20/32
CPCB01J20/22B01J20/103B01J20/3204B01J20/3259B01J2220/46B01J2220/4806B01J2220/4812
Inventor 黄维秋许继星张炳权谭小兵吕爱华朱忠泉钟璟刘鹏
Owner CHANGZHOU UNIV
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