Preparation method of super-hydrophobic nanoscale white carbon black membrane and super-hydrophobic nanoscale white carbon black powder

A nano-silica and super-hydrophobic technology, applied in the field of inorganic materials, can solve the problems of less than 10% comprehensive utilization rate, untreated rice husk ash, and environmental pollution, and achieve the effects of low cost, easy operation, and high content

Inactive Publication Date: 2012-07-18
SHANDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the vast majority of rice processing enterprises still do not have a reasonable and effective method for utilizing rice husks, so a large amount of rice husks are discarded as agricultural waste or used as primary fuels, and the comprehensive utilization rate is less than 10%, and most of the burned rice husk ash has no processing, which wastes resources and pollutes the environment
The preparation of white carbon black is mostly produced by relatively expensive chemical raw materials, with high cost and low output

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] 1. Preparation of nano-rice husk ash: use the self-propagating combustion method to burn rice husks, control the combustion temperature at 600°C, and fully burn in the air until it becomes off-white rice husk ash, grind it finely, and pass through a 200-mesh sieve to obtain the average The particle size is about 50nm and the specific surface area is 196.23m 2 / g of nano rice husk ash.

[0013] 2. Preparation of sodium silicate solution: dissolve 10 g of rice husk ash into 100 ml of 1M NaOH solution and boil, remove precipitated impurities after cooling, and adjust its pH value to 3 with HCl to obtain sodium silicate solution.

[0014] 3. Preparation of superhydrophobic nano-silica film and silica powder: mix absolute ethanol, ammonia water and deionized water in a ratio of 25:2:3 and stir to prepare liquid A; mix absolute ethanol, silicon Sodium solution and hydroxyl silicone oil were mixed and stirred at a ratio of 1:1:0.1 to obtain liquid B; liquid A was slowly added...

Embodiment 2

[0017] Step 1 is the same as Example 1, except that step 2 is different: in step 2, the modifier added is changed from the original hydroxyl silicone oil to hexamethyldisilazane, and the others remain unchanged.

[0018] 1. Preparation of nanometer rice husk ash: use self-propagating combustion method to burn rice husk, control the combustion temperature at 500°C, fully burn in the air until it becomes off-white rice husk ash, grind it finely, and pass through a 200-mesh sieve to obtain the average The particle size is about 50nm and the specific surface area is 196.23m 2 / g of nano rice husk ash.

[0019] 2. Preparation of sodium silicate solution: dissolve 10 g of rice husk ash into 100 ml of 1M NaOH solution and boil, remove precipitated impurities after cooling, and adjust its pH value to 3 with HCl to obtain sodium silicate solution.

[0020] 3. Preparation of superhydrophobic nano-silica film and silica powder: mix absolute ethanol, ammonia water and deionized water in ...

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Abstract

The invention provides a preparation method of a super-hydrophobic nanoscale white carbon black membrane and super-hydrophobic nanoscale white carbon black powder. The preparation method provided by the invention is characterized by comprising the following steps of 1, preparing nanoscale rice husk ash by a self-propagating combustion method, 2, adding the nanoscale rice husk ash into a NaOH solution having concentration of 1M in a way that each 1g of the nanoscale rice husk ash is added into 10ml of the NaOH solution, carrying out boiling, cooling, removing precipitated impurities, and adjusting a pH value to 3 by a HCl solution to obtain a sodium-silicon solution, and 3, preparing the super-hydrophobic nanoscale white carbon black membrane and the super-hydrophobic nanoscale white carbon black powder by an improved sol-gel method, wherein a used modifier is hydroxyl silicone oil or hexamethyldisilazane. The super-hydrophobic nanoscale white carbon black powder obtained by the preparation method has SiO2 content of 99.64%. The super-hydrophobic nanoscale white carbon black membrane has a wetting contact angle of 166.32 degrees. The super-hydrophobic nanoscale white carbon black membrane and the super-hydrophobic nanoscale white carbon black powder belong to the field of hydrophobic surfaces and can be utilized as water resistance agents, catalysts, catalyst carriers, raw materials of a petrochemical industry, decolorants, delustering agents, rubber strengthening agents, plastic fillers, printing ink thickening agents, metal soft polishing agents, insulative heat-insulation fillers, high-grade daily cosmetic fillers and spraying materials.

Description

technical field [0001] The invention provides a superhydrophobic nanometer white carbon black film and a preparation method of white carbon black powder, belonging to the technical field of inorganic materials. Background technique [0002] China is the largest rice producer in the world. The annual output of rice in 2011 was about 228.14 million tons. As the main by-product of rice processing, rice husk accounts for 20%-30% of the weight of rice. It is a cheap and easy-to-collect renewable resource. However, the vast majority of rice processing enterprises still do not have a reasonable and effective method for utilizing rice husks, so a large amount of rice husks are discarded as agricultural waste or used as primary fuels, and the comprehensive utilization rate is less than 10%, and most of the burned rice husk ash has no Disposal is a waste of resources and pollutes the environment. White carbon black is a kind of ultrafine and active silica particles, which is a white...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/12B82Y40/00B09B3/00
Inventor 许珂敬李智广郭彦青孙庆文
Owner SHANDONG UNIV OF TECH
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