Modified oxide hybrid phenolic aldehyde thermal insulation material and preparation method thereof
A technology of thermal insulation materials and oxides, applied in the direction of coating, etc., can solve the problems that affect the service life and storage life of high-performance thermal insulation materials, cannot fundamentally solve the problems of absorbing and enriching gaseous water, and the huge difference in surface reactivity , to achieve the effect of stable and controllable weight gain, wide and cheap sources of raw materials, and excellent moisture-proof performance
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[0032] In a first aspect, the present invention provides a method for preparing a modified oxide hybrid phenolic heat insulating material, the method comprising the following steps:
[0033] (1) Preparation of modifying agent: mixing the modifying agent with an optional solvent to prepare a modifying agent with hydrophobic modification function;
[0034] (2) Modification reaction: introducing the modifier into the oxide hybrid phenolic heat insulation material to keep warm for modification reaction;
[0035](3) Drying: After the modification reaction is completed, excess modifying reagents are removed by heating under in-situ conditions to obtain a modified oxide hybrid phenolic heat insulating material with moisture-proof performance.
[0036] In some preferred embodiments, in step (1), the modifying reagent comprises a first modifying reagent and a second modifying reagent, and the first modifying reagent is selected from formula (1) or formula ( 2) One or more reagents of ...
Embodiment 1
[0061] The size is 500mm×500mm×30mm, the density is 0.5g / cm 3 , a commercially available unmodified oxide hybrid phenolic airgel composite sheet with a thermal conductivity of 0.06W / (m·K) at room temperature is placed in a tank with a height of 800mm and a diameter of 800mm to keep the atmosphere Keep warm at 60°C for 4 hours in the connected state. While maintaining the same temperature, evacuate the inside of the tank to a vacuum, then inhale the modifier containing 94g of dimethyl carbonate and 94g of trimethylmethoxysilane, close the tank and continue to keep warm at 60°C for 12h, and then take out the plate , 90 ° C blast drying for 6h. The surface of the obtained material is in a hydrophobic state, the weight of the material increases by 2% (the mass change rate is tested after 120°C oven treatment for 2 hours, the same below), the moisture absorption rate is 0.40%, and the thermal conductivity change at room temperature is <1%.
Embodiment 2
[0063] The size is 500mm×500mm×30mm, the density is 0.5g / cm 3 , a commercially available unmodified oxide hybrid phenolic airgel composite sheet with a thermal conductivity of 0.06W / (m·K) at room temperature is placed in a tank with a height of 800mm and a diameter of 800mm to keep the atmosphere Keep warm at 60°C for 4 hours in the connected state. While maintaining the same temperature, evacuate the inside of the tank to a vacuum, then inhale a mixture containing 94g of dimethyl carbonate, 94g of trimethylmethoxysilane and 187.5g of acetone, then close the tank and continue to keep warm at 60°C for 12h, then put The plates were taken out and air-dried at 90°C for 6 hours. The surface of the material is in a hydrophobic state, the weight gain of the material is 2.5%, the moisture absorption rate is 0.35%, and the thermal conductivity at room temperature does not change <1%.
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