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Heat-insulating material and preparation method thereof

A thermal insulation material and sol technology, which is applied in the field of thermal insulation materials and their preparation, can solve the problems of affecting the barrier effect of thermal insulation materials, uneven distribution, and agglomeration, and achieves a simple and feasible preparation method, low cost, and barrier agent evenly distributed effect

Active Publication Date: 2012-06-20
GUANGDONG ALISON HI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, powdered radiation blocking materials always have the disadvantages of large particles and uneven distribution
Regardless of whether it is mechanically stirred or suspended in a sol with a dispersant and then gelled, the powder will inevitably agglomerate, which will affect the radiation barrier effect of the thermal insulation material.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Dilute the silicon hydrosol with a solid mass fraction of 40% to 20% with water, gradually add it dropwise to dilute sulfuric acid with a mass fraction of 95% until the pH value of the mixed solution reaches 6.5, and add 0.2% of the solid mass in the silica hydrosol to the solution. times the titanyl sulfate, the silica sol with controllable gel speed can be obtained. Make the chopped glass fiber felt roll into a felt roll with a diameter of 0.3m and put it as a reinforcement in an open vacuum container, close the vacuum container, and then evacuate, and use the vacuum negative pressure to inhale the sol until the liquid surface just covers the reinforcement At the highest point, let stand for 5 minutes and vent the vacuum. Then the impregnated reinforcement was left to stand for 1 day (at room temperature), and the sol became a gel and aged, and then the reinforcement filled with the gel was placed in a heating device and heated with steam at 105 degrees Celsius for 2 ...

Embodiment 2

[0022] After diluting the water glass with a modulus of 3.3 and a Baume degree of 30% with water to 2 times, add nitric acid with a concentration of 0.05mol / L to the pH value of the pH meter in the water glass to show 2.3. 0.15 times of the solid mass of titanyl sulfate to obtain silica hydrosol. Make the pet fiber felt roll into a felt roll with a diameter of 0.3 meters and put it as a reinforcement in an open vacuum container, close the vacuum container, then vacuumize, put in the sol until the liquid surface is not above the highest point of the reinforcement, and let it stand for 5 Minutes, vent the vacuum. Then let the impregnated reinforcement stand for 1 day (at room temperature), and the sol becomes a gel, and then put the reinforced body full of gel into a heating device and heat it with boiling water (100 degrees Celsius) for 3 hours, the sulfuric acid in the gel Titanium oxide decomposes to produce metatitanic acid precipitation, and the gel turns white at this tim...

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Abstract

The invention discloses an aerogel doped meta-titanic acid composite fiber heat-insulating material and a preparation method thereof. The material composition mainly comprises silicon dioxide, a meta-titanic acid serving as a radiation barrier agent and a reinforcing fiber with low stacking density. The weight ratio of the silicon to the meta-titanic acid to the reinforcing fiber is 1:0.1-0.2:1-3. The aerogel doped meta-titanic acid composite fiber heat insulating material can effectively keep out the radiation by introducing meta-titanic acid precipitates in an aerogel by utilizing an in-situ generation method, and avoids the defects of agglomerating the powder radiation barrier agent and improving solid thermal conductivity.

Description

technical field [0001] The invention relates to a heat insulating material and a preparation method thereof. Background technique [0002] At present, in the field of heat insulation, a super heat insulation material has appeared, that is, a fiber-reinforced airgel composite material using silica airgel as the main heat insulation component: 1, a composite of airgel particles and fibers, see Chinese Patent No. 96196880.X "Airgel Composite Material Containing Fibers". 2. For the composite of airgel powder and fiber, see Chinese Patent No. 200510124588.2 "Preparation Method of Brucite Fiber Reinforced SIO2 Airgel Thermal Insulation Material". 3. Composites of continuous airgel and fibers, see Chinese Patent No. 200510031952.0 "An Airgel Thermal Insulation Composite Material and Its Preparation Method". [0003] The heat insulation materials involved in the above-mentioned patented technologies all use silica airgel as the main material for heat insulation. Silica aerogels h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/00C04B14/38
Inventor 刘平何凡卫荣辉
Owner GUANGDONG ALISON HI TECH
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