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Cellulose/titanium dioxide/silica aerogel and preparation method thereof

A titanium dioxide and silicon dioxide technology, which is applied in the field of preparation of cellulose/titanium dioxide/silica aerogels, can solve the problems of easy moulding of cellulose, expensive raw materials and high cost, and achieves excellent biocompatibility, excellent reinforcement performance, the effect of high heat resistance

Active Publication Date: 2013-07-17
SHANDONG CAYON TESTING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent CN 1981925B mixes surfactant-modified silica sol and titania sol to prepare titania / silica aerogel, but the strength and flexibility of the aerogel are poor, and the raw materials are expensive and the cost is relatively high. high
The composition has excellent mechanical properties and flexibility, but the cellulose is prone to mildew and lacks heat resistance
[0005] At present, nano-cellulose is used as the core body, and nano-titanium dioxide is first loaded, and then covered with a silica layer, and finally subjected to aging, aging, hydrophobicity, bonding molding and drying to obtain cellulose / titanium dioxide / silica Airgel has not been reported in the literature

Method used

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  • Cellulose/titanium dioxide/silica aerogel and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0035] 1. Preparation of cellulose sol: Add 20.0g of cellulose to 400.0g of water, and use KQ2200DB numerical control ultrasonic cleaner to ultrasonically disperse for 1 hour to make cellulose sol;

[0036] 2. Nano titanium dioxide loaded on the surface: while stirring, add 4.0mol / L TiCl to the cellulose sol 4 Aqueous solution 94.0mL, maintain the reaction temperature at 10°C, then add 2.0mol / L potassium hydroxide aqueous solution to adjust the pH of the system to 1.00, raise the temperature to 100°C, and react at a constant temperature at 100°C for 1 hour to obtain nano-titanium dioxide-supported cellulose Sol;

[0037] 3. Surface-coated silica: under continuous stirring, 300.0mL of 2.0mol / L sodium silicate aqueous solution and 2.0mol / L hydrochloric acid aqueous solution were simultaneously (cocurrently) dropped into the cellulose sol supported by nano-titanium dioxide for reaction , the reaction temperature is maintained at 75°C. After adding the reaction liquid, heat-prese...

Embodiment 2

[0042] 1. Preparation of cellulose sol: Add 20.0g of cellulose into 80.0g of water, and ultrasonically disperse for 1 hour with a KQ2200DB numerical control ultrasonic cleaner to make cellulose sol;

[0043] 2. Nano titanium dioxide loaded on the surface: while stirring, add 0.5mol / L TiCl to the cellulose sol 4 100.0 mL of aqueous solution and 120.0 mL of 0.5 mol / L ammonia solution, maintain the reaction temperature at 21 ° C, after the addition of the reaction solution, the pH of the system is 0.33, raise the temperature to 70 ° C, and react at a constant temperature at 70 ° C for 10 hours to obtain nano-titanium dioxide Loaded cellulose sol;

[0044] 3. Surface-coated silicon dioxide: Under constant stirring, 111.1 mL of 0.3 mol / L sodium silicate aqueous solution and 0.5 mol / L sulfuric acid aqueous solution were simultaneously (cocurrently) dropped into the cellulose sol supported by nano-titanium dioxide for reaction , the reaction temperature is maintained at 95°C. After ...

Embodiment 3

[0049] 1. Preparation of cellulose sol: add 20.0g of cellulose to 200.0g of water, and use KQ2200DB numerical control ultrasonic cleaner to ultrasonically disperse for 1 hour to make cellulose sol;

[0050] 2. Surface-loaded nano-titanium dioxide: While stirring, add 160.0 mL of 4.0 mol / L sodium hydroxide aqueous solution to the cellulose sol, maintain the reaction temperature at 50 ° C, and then add 2.5 mol / L TiCl 4 Aqueous solution 100.0mL, TiCl 4 After adding the aqueous solution, the pH value of the system is 0.10, the temperature is raised to 85°C, and the reaction is carried out at a constant temperature of 85°C for 3 hours to obtain a cellulose sol supported by nano-titanium dioxide;

[0051] 3. Surface-coated silicon dioxide: Under continuous stirring, 100.0 mL of 1.0 mol / L sodium silicate aqueous solution and 1.0 mol / L acetic acid aqueous solution were dropped into the slurry at the same time (parallel flow) to react, and the reaction temperature was maintained at 90...

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Abstract

The invention relates to a cellulose / titanium dioxide / silica aerogel and a preparation method thereof. The method comprises the steps such as cellulose sol preparation, nano-grade titanium dioxide surface loading, silica surface coating, curing, aging, hydrophobizing, bonding forming, drying treatment, and the like. According to the invention, nano-grade cellulose is adopted as a core, and is loaded with nano-grade titanium dioxide; a silica layer is coated; and the steps such as curing, aging, hydrophobizing, bonding forming, drying treatment, and the like are carried out, such that the cellulose / titanium dioxide / silica aerogel is obtained. The aerogel has the performances such as flexibility, high strength, bacterium resistance, ultraviolet resistance, odor-removing function, warm-keeping function, thermal insulation, and sound insulation. The aerogel can be widely applied in the fields such as thermal underwear, body armor, insulation materials, pressure-resistant materials, special coatings, aerospace materials, and the like.

Description

technical field [0001] The invention relates to the field of airgel preparation, in particular to the preparation of a cellulose / titanium dioxide / silica airgel with flexibility, high strength, antibacterial, anti-ultraviolet, deodorization, heat preservation, heat insulation and sound insulation properties method. Background technique [0002] Airgel is a solid with a porous, sponge-like structure, about 95% of which is air, with ultra-low density, ultra-large pores, ultra-large internal surface area, ultra-low thermal conductivity, ultra-low sound velocity, and excellent thermal stability and Mechanical properties, widely used in catalysis, aerospace, advanced materials and other fields. [0003] Silica airgel is a lightweight nanoporous material with a density as low as 3Kg / m 3 , The porosity can be as high as 99%. Its slender nanoporous network structure effectively suppresses solid, gaseous and radiative heat conduction, making it an efficient and lightweight nanoporo...

Claims

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Application Information

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IPC IPC(8): B01J13/00
Inventor 张国庆李秀娟尹振燕曾永斌张庆杰秦晓楠赵彦军姚超
Owner SHANDONG CAYON TESTING TECH
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