Preparation method of foamed boron nitride block material
A technology of boron nitride block and bulk materials, applied in chemical instruments and methods, nitrogen compounds, inorganic chemistry, etc., can solve the problems of high cost, complicated preparation process, low output, etc., and achieve reduction of production energy consumption and cost, method Non-toxic, uniform product appearance
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[0031] Example 1
[0032] (1) Add 5.0 g of melamine and 7.5 g of boric acid to a glass container containing 250 ml of water so that each ml of water contains 0.02 g of melamine and 0.03 g of boric acid. After stirring for 2 hours, put the glass container into a temperature control system In a constant temperature water bath, heat to 95°C to completely dissolve melamine and boric acid and keep it warm for 4 hours;
[0033] (2) Put the stable melamine-boric acid-water mixed solution and its container obtained in step (1) into an ultrasonic instrument with adjustable ultrasonic power and temperature, and set the ultrasonic power to 40kHz and the temperature to At 70°C, heat preservation and ultrasound for 5 hours, a white block precipitated in the solution;
[0034] (3) Place the white block and the solution obtained in step (2) in a freeze dryer and vacuum freeze-dry (temperature -40°C, pressure 30Pa, drying time 120 hours) to obtain a dry white solid precursor;
[0035] (4) Heat the w...
Example
[0037] Example 2, Example 3
[0038] The concentration of melamine in step (1) in Example 1 was changed to 0.01 g and 0.05 g melamine per milliliter of water, and the other operations were the same as in Example 1, and the product density was 12 mg / cm. 3 And 65mg / cm 3 , Others are the same as in Example 1.
Example
[0039] Example 4, Example 5
[0040] The concentration of boric acid in step (1) in Example 1 was changed to 0.01 g and 0.05 g boric acid per milliliter of water, and the other operations were the same as in Example 1. The density of the obtained product was 15 mg / cm. 3 And 43mg / cm 3 , Others are the same as in Example 1.
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