Silicon dioxide hollow sphere nano composite material, and preparation and application thereof

A nano-composite material, silica technology, applied in the field of nano-materials, can solve the problems of self-cleaning and anti-fog effects, unsatisfactory durability, high cost, and many components, etc., and achieves easy operation and application, good mechanical resistance. Good abrasiveness and process operability

Active Publication Date: 2019-05-03
UNIV OF SCI & TECH BEIJING
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  • Description
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Problems solved by technology

However, these methods have their own limitations: method (1) needs to repeatedly spray surface-active agent on a regular basis and seems inconvenient; method (2) causes glass products to have poor abrasion resistance and heat resistance due to the use of organic substances; method ( In 3), it usually takes 7 to 10 minutes to heat and evaporate water droplets, and the timeliness is poor, and additional energy is required, which consumes a lot of energy, so it is not practical; the device of method (4) is more complicated, has many c

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  • Silicon dioxide hollow sphere nano composite material, and preparation and application thereof
  • Silicon dioxide hollow sphere nano composite material, and preparation and application thereof
  • Silicon dioxide hollow sphere nano composite material, and preparation and application thereof

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preparation example Construction

[0055] More specifically, the preparation method of the silica nano-hollow sphere suspension may include: reacting raw materials containing solvent, lye, polyacrylic acid and alkoxysilane. The conditions of the above reaction are not strictly limited, as long as it is convenient to prepare the silica hollow sphere suspension with the above quality requirements of the present invention. The molecular weight of polyacrylic acid is controlled at 2000-1000; specifically, the volume ratio between solvent, lye, polyacrylic acid and alkoxysilane can be controlled to be 90:3-6:0.4-0.8:1-3. The range is favorable for preparing the above-mentioned specific silica hollow spheres.

[0056] The hollow spheres are washed repeatedly with water to remove polyacrylic acid, ammonia water, etc. in the hollow sphere suspension. Disperse the washed hollow spheres in ethanol to prepare for the configuration of hollow sphere composite nanomaterials.

[0057] Studies have found that the above prepa...

Embodiment 1

[0071] Preparation of silica nano-hollow spheres with a particle size of 20-120nm:

[0072] (1) Add 0.4 to 0.8 milliliters of polyacrylic acid solution with a molecular weight of 5000 (wherein the mass percentage of polyacrylic acid is 50%) into 3 to 6 milliliters of ammonia water, and stir in a water bath at 25 degrees Celsius;

[0073] (2) 90 milliliters of ethanol is joined in the 500 milliliter flask, the mixed solution in (1) is joined in the flask, stirred in a water bath at 25 degrees Celsius;

[0074] (3) Add 1-3 milliliters of tetraethoxysilane into the mixed solution in (2) at 25 degrees Celsius, and continue stirring for 10-20 hours to obtain the hollow silicon dioxide nanospheres.

[0075] (4) Obtain the precipitate of hollow silicon dioxide nanospheres by centrifugation, add 500 milliliters of water, perform ultrasonic treatment for 30 minutes, and then perform centrifugation to remove polyacrylic acid. This washing process is repeated twice. Finally, the obtaine...

Embodiment 2

[0078] Preparation of nano-silica acidic sol:

[0079] At room temperature (25°C), add 0.05-0.2mL of concentrated hydrochloric acid (37%) into 5-20mL of water to make a dilute hydrochloric acid solution; then, add the above-mentioned dilute hydrochloric acid solution into 200-300mL of ethanol, stir and mix well .

[0080] Add 10-40mL tetraethoxysilane to the above mixed solution, stir and react at room temperature for 4 hours, and then react at room temperature for 4 days to obtain nano-silica acidic sol, which can be stored at 4°C.

[0081] The solid-state nuclear magnetic resonance is used for detection, and the results show that the condensation degree of the nano-silica acidic sol prepared above is about 70-90%, and the average length of the chain nano-silica is about 5nm.

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Abstract

The invention relates to a silicon dioxide hollow sphere nano composite material, and a preparation and application thereof, and relates to the field of nano materials. The preparation method of the silicon dioxide hollow sphere nano composite material comprises the following steps: separately preparing a silicon dioxide hollow sphere suspension and a nano silicon dioxide acidic sol, mixing the silicon dioxide hollow sphere suspension with the nano silicon dioxide acidic sol by stirring, and then carrying out standing to obtain the silicon dioxide hollow sphere nano composite material. A silicon dioxide nano composite coating prepared from the silicon dioxide nano composite material disclosed by the invention has good anti-reflection, permeability-increasing, self-cleaning and anti-fog effects, and meanwhile, the coating also has good mechanical wear resistance and weather resistance, and has good firmness with a substrate. High-temperature calcination or other post-treatment modes arenot needed for preparing the coating, the coating can exert an effect outdoors for a long time, and the application range is wide.

Description

technical field [0001] The invention relates to the field of nanometer materials, in particular to hollow silicon dioxide nanometer composite materials and their preparation and application. Background technique [0002] With the development of science and technology, the research and development of multifunctional self-cleaning glass is very urgent. The so-called multifunctional glass refers to a glass that has both anti-reflection and anti-reflection, self-cleaning (super-hydrophilic anti-fog or super-hydrophobic) properties, and ultra-high mechanical strength and weather resistance. Simultaneously, the preparation method is also required to be simple and the preparation cost is low. [0003] Self-cleaning glass (Self-cleaning glass) refers to the special physical or chemical treatment of ordinary glass, which produces unique physical and chemical properties on the surface, so that the glass can achieve cleaning effect without traditional manual scrubbing methods. Glass....

Claims

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Application Information

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IPC IPC(8): C01B33/18C03C17/25B82Y30/00B82Y40/00
Inventor 杜鑫王雨露
Owner UNIV OF SCI & TECH BEIJING
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