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Reinforced aerogel composite material and preparation method thereof

A composite material and airgel technology, which is applied in the fields of explosion-proof, sound insulation, shock absorption and energy-absorbing materials, heat preservation, light weight, and fire prevention. , pollute the operating environment and other issues, and achieve the effect of excellent flexural resistance, low cost and simple process

Active Publication Date: 2015-04-08
NANJING WEICAI NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above-mentioned airgel composite materials can all improve the mechanical properties of the airgel, they all more or less improve the thermal conductivity of the airgel composite material (the thermal conductivity is above 0.020W / (m2·K)), Neither can achieve the excellent thermal insulation level of the airgel block (the thermal conductivity is below 0.012W / (m2 K)), and the surface of the former airgel composite material is easy to pulverize and powder off, polluting the operating environment, while the latter The nanoporous structure of airgel powder is easy to destroy and the filling volume of airgel powder is restricted. Therefore, how to make the silica airgel without losing the extremely low thermal conductivity (below 0.012W / (m2·K)) Under the circumstances, striving to improve its mechanical properties is a key step in its development and engineering application

Method used

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  • Reinforced aerogel composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Such as figure 1 As shown, a reinforced airgel composite material of this embodiment is composed of a single or multiple silica airgel blocks 1, and between the surface of the airgel or the interface of the blocks, the fiber net The water-based adhesive reinforced by grid cloth 3 is coated or bonded into one. The water-based adhesive is one or more mixtures of water-based inorganic adhesives and water-based organic adhesives. The water-based inorganic adhesive is selected from From the group consisting of cement, gypsum, limestone, water glass, copper oxide-phosphate glue, the water-based organic adhesive is selected from water-based acrylic resin, water-based polyurethane resin, water-based epoxy resin, water-based silicone resin, water-based fluorocarbon resin, acetic acid A group consisting of ethylene-ethylene polymer glue and polyvinyl acetal glue, the fiber mesh cloth is selected from alkali-resistant glass fiber mesh cloth, polyvinyl alcohol fiber mesh cloth, pol...

Embodiment 2

[0024] The preparation method of the enhanced airgel composite material of embodiment 1 comprises the following steps: (1) surface modification of silica airgel block: under the condition of 200 ℃, use hexamethyldisilazane and iso Propanol (molar ratio: 3:1) was used to gas-phase modify silica airgel blocks for 4 hours; then the modified airgel was heat-treated at 450°C for 3 hours in an air atmosphere, and then used for later use. .

[0025] (2) Use 525 ordinary Portland cement as the water-based adhesive and alkali-resistant glass fiber mesh cloth (3×3mm, 80g / m2) to evenly cover the surface of the silica airgel block or two pieces of silica airgel. Between the silica airgel blocks, the thickness of the water-based adhesive is 1-5mm.

[0026] (3) According to the cement curing standard, the airgel composite material was prepared after curing for 28 days under certain temperature and humidity conditions.

Embodiment 3

[0028] The preparation method of the reinforced airgel composite material in this example is to change the water-based adhesive in Example 2 to 901 glue.

[0029] (1) Surface modification of silica airgel blocks: at 200°C, use hexamethyldisilazane and isopropanol (molar ratio 3:1) to modify the surface of silica airgel blocks Carry out gas phase modification, and the modification time is 4 hours; then heat-treat the modified airgel in an air atmosphere environment at 450°C for 3 hours, and set aside.

[0030] (2) Using 901 glue as the water-based adhesive, alkali-resistant glass fiber mesh cloth (3×3mm, 80g / m2) is evenly coated on the surface of the silica airgel block or two silica airgel Between the blocks, the thickness of the water-based adhesive is 1-5mm.

[0031] (3) Stand still in the air atmosphere for 48 hours, and prepare the airgel composite material after the 901 glue is completely cured.

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Abstract

The invention provides a reinforced aerogel composite material and a preparation method thereof. The reinforced aerogel composite material comprises single aerogel or two aerogels or more than two aerogels, the surfaces or block interfaces of the block aerogel are coated or bound into a whole by virtue of fiber mesh fabric-reinforced waterborne adhesive. The preparation method of the reinforced aerogel composite material comprises the following steps: (1) carrying out hydrophobic modification treatment on the surfaces; (2) carrying out hydrophilic / hydrophobic modification treatment on the surfaces; and (3) preparing the reinforced aerogel composite material: uniformly coating the surface of the block aerogel or the interface of two aerogels with waterborne adhesive and fiber mesh fabric and curing to obtain the reinforced aerogel composite material. The reinforced aerogel composite material provided by the invention has the characteristics of excellent thermal-insulation property, heat preservation property, sound insulation property, fireproof property, explosion resistance, shock absorption, energy absorption, light weight, better mechanical properties, the preparation process of the material is simple and practical and the material has wide range of applications.

Description

technical field [0001] The invention relates to a composite material, in particular to an airgel composite material, which belongs to the field of light weight, thermal insulation, fireproof, sound insulation, explosion-proof, shock-absorbing and energy-absorbing materials. Background technique [0002] Silica airgel is a nano-light porous material with controllable structure. It has the characteristics of nanostructure, large surface area and high porosity. Its unique structural characteristics make it unique in thermal, electrical, acoustic, optical and other aspects. For example, the thermal conductivity can reach below 0.012W / m2 k, which is far lower than the thermal conductivity of still air at room temperature (0.024W / m2 k), and it is the best thermal insulation performance among all solid materials. And light weight, transparent, waterproof and fireproof, sound insulation and noise reduction, shock absorption and energy absorption, acid and alkali resistance, corrosio...

Claims

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Application Information

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IPC IPC(8): C04B30/02
Inventor 卢锋
Owner NANJING WEICAI NEW ENERGY TECH
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