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Method for preparing super-hydrophobic silica

A silica and super-hydrophobic technology, applied in the direction of silica, fibrous fillers, etc., to enhance the binding force, the preparation method is simple, and the effect of preventing secondary agglomeration

Inactive Publication Date: 2008-08-27
江苏汉德纳米材料科技有限公司
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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

[0018] 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 disperse evenly; the temperature was raised to 80°C, and 1.5g of γ-glycidyl etheroxypropyl trimethoxysilane was added, and after 30 minutes of reaction, the temperature was raised to 110°C And let it reflux for 4 hours; then lower the temperature to 80°C, add 7.5g of dodecylamine, react for 4 hours; finally wash with toluene 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

Embodiment 2

[0020] Take by weighing 3g fumed silica (particle diameter 20-40nm, specific surface area 380m 2 / g), 150g of toluene was placed in a 500ml three-necked flask, stirred to disperse evenly; the temperature was raised to 80°C, and 15g of γ-glycidyl etheroxypropyl triethoxysilane was added, and after 30 minutes of reaction, the temperature was raised to 110°C And make it reflux for 4 hours; then lower the temperature to 80°C, add 7.5g stearic acid amide, react for 3 hours; finally wash with toluene and filter the silica solid powder, put it in a vacuum oven at 110°C, and dry for 12 hours. The test results are shown in Table 1

Embodiment 3

[0022] Weigh 3g of precipitated silica (particle diameter 40-60nm, specific surface area 150m 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 chloropropyltrimethoxysilane was added, and after 30 minutes of reaction, the temperature was raised to 120 ℃ and allowed to reflux for 4 hours; then lower the temperature to 80°C, add 3g of dodecylamine, 0.3g of sodium hydroxide, and react for 2 hours; finally wash with N,N-dimethylformamide and filter the solid silica powder , placed in a vacuum oven at 110°C, and dried for 12 hours. The test results are shown in Table 1

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Abstract

The invention discloses a process for preparing ultra-hydrophobic silica, and the preparation process is simple in technique, temperate in reaction conditions and relatively low in preparation cost. The steps of the process for preparing the ultra-hydrophobic silica comprise (A) dispersing: under the normal temperature, mixing silicon dioxide solid powder and solvent, uniformly dispersing the mixture and adding the mixture into a reactor, (B) reaction: heating up the reactor to 60-100 DEG C, adding finishing agent 1, after continuously stirring and reacting 20-40 minutes, heating up the temperature to 100-140 DEG C and reflowing 3-6 hours for sufficient reaction, reducing temperature to 60-100 DEG C, adding finishing agent 2, stirring and reacting for 1-4 hours to enable the surface of the silicon dioxide to be ultra-hydrophobic, (C) separating and drying: washing and filtering the ultra-hydrophobic silica by the solvent, removing the solvent and the remained reactant and drying in vacuum.

Description

technical field [0001] The present invention relates to a kind of preparation method of silicon dioxide, more specifically relate to a kind of preparation method of superhydrophobic silicon dioxide. 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 applications. There...

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 江苏汉德纳米材料科技有限公司
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