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Method for preparing super-hydrophobic silica by one-step process

A technology of silica and superhydrophobic, applied in the direction of silica, fibrous fillers, etc., to achieve the effects of low preparation cost, enhanced binding force, and simple preparation method

Inactive Publication Date: 2008-08-27
LIANYUNGANG DEBANG FINE CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are very few reports on the superhydrophobic state of the silica surface by surface modification.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Weigh 3g of precipitated silica (particle diameter 40-60nm, specific surface area 150m 2 / g), 30g of toluene was placed in a 250ml three-necked flask, stirred to make it evenly dispersed; the temperature was raised to 80°C, and 1.5g of octadecyltrimethoxysilane was added, and after 30 minutes of reaction, the temperature was raised to 110°C and allowed to reflux for 4 Hours, make it fully react; finally wash with toluene and filter the silica solid powder, place in a vacuum oven at 110°C, and dry for 12 hours. The test results are shown in Table 1

Embodiment 2

[0018] Weigh 3g of precipitated silica (particle diameter 40-60nm, specific surface area 150m 2 / g), 150g toluene was placed in a 500ml three-necked flask, stirred to disperse evenly; the temperature was raised to 80°C, and 15g of octadecyltrimethoxysilane was added, and after 30 minutes of reaction, the temperature was raised to 110°C and allowed to reflux for 4 hours , to make it fully react; finally wash and filter the solid silica powder with toluene, place it in a vacuum oven at 110°C, and dry it for 12 hours. The test results are shown in Table 1

Embodiment 3

[0020] Take by weighing 3g fumed silica (particle diameter 20-40nm, specific surface area 380m 2 / g), 90g of N,N-dimethylformamide was placed in a 250ml three-necked flask, stirred to disperse evenly; the temperature was raised to 90°C, 3g of hexadecyltriethoxysilane was added, and after 30 minutes of reaction, the temperature was raised Reflux at 120°C for 4 hours to fully react; finally wash with N,N-dimethylformamide and filter the solid silica powder, place it in a vacuum oven at 110°C, and dry for 12 hours. The test results are shown in Table 1

[0021] Table 1: A list of changes in the water contact angle of silica before and after the reaction

[0022] project

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PUM

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Abstract

The invention discloses a process for preparing super hydrophobic silicon dioxide by the one-step method, the process of preparation is simple in technique, mild in reaction conditions and low in preparation cost. The prepared silicon dioxide has a water contact angle up to 155.1 degrees, which can effectively prevent secondary agglomeration on the surface of the silicon dioxide, thereby improving the interfacial compatibility of inorganic phase and organic phase and strengthening the combination force between the silicon dioxide and polymer. The method comprises steps of (A) dispersing, mixing the silicon dioxide solid powder and dissolvent at normal temperature and adding to a reactor after being uniformly dispersed, (B) reaction, heating the reactor to 60-100DEG C, adding in treating agent, continuing stirring to react for 20-40 minutes, then heating to 100-140 DEG C and flowing back for 3-6 hours to enable the surface of the silicon dioxide to be extra hydrophobic, (C) dispersing and drying, washing by using the dissolvent and filtering the super hydrophobic silicon dioxide, removing the dissolvent and residual reactant and vacuum-drying.

Description

technical field [0001] The present invention relates to a kind of preparation method of silicon dioxide, more specifically relate to a kind of method for preparing superhydrophobic silicon dioxide by one-step method. Background technique [0002] Nano-silica is a lightweight nano-porous material with large specific surface area, high porosity, size effect and special optical and electrical properties, as well as high strength, high toughness and good stability at high temperatures. singularity. Therefore, nano-silica has broad application prospects, and has been applied in coatings, plastics and rubber processing, catalyst carriers, and pharmaceutical development. However, there are hydroxyl groups on the surface of nano-silica, and it is easy to form hydrogen bond adsorption when it encounters water molecules, making the surface hydrophilic, which leads to its agglomeration and difficulty in dispersing, which greatly affects the performance of nano-silica in some field ap...

Claims

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Application Information

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IPC IPC(8): C01B33/113C09C1/28
Inventor 陈苏陈莉陆臻黄旭
Owner LIANYUNGANG DEBANG FINE CHEM
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