Boric Acid → Orthoboric acid, compound with 1,3,5-triazine-2,4,6-triamine (1:1)

Participants

Reaction Steps

First, 40 kg of anhydrous orthoboric acid, manufactured by Showa Chemical Industry Co., Ltd. (hereinafter, this product was used as anhydrous boric acid), 50 kg of melamine, and 1 kg of calcium borate, manufactured by KINSEI MATEC CO., LTD., were mixed by a Henschel mixer. Next, the mixture was placed in a constant temperature and humidity chamber at a temperature of 90° C. and a relative humidity of 85% for 5 hours to produce melamine borate. Then, the melamine borate was subjected to calcination and crystallization in a batch atmosphere furnace under a nitrogen atmosphere at 1900° C. for 2 hours to yield boron nitride with a graphitization index (GI) of 4.58 and a specific gravity of 2.27 g/cm3. After that, grinding was adjusted to prepare D-7 with a volume-average particle diameter of 18.0 μm.

Provenance & Evidence