A kind of method for synthesizing high degree of polymerization ammonium polyphosphate at high temperature and high pressure
A technology of high temperature and high pressure synthesis, ammonium polyphosphate, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problem of low polymerization degree of ammonium polyphosphate, achieve simple process, concise process principle, and good market prospects Effect
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Embodiment 1
[0030] The method for synthesizing high degree of polymerization ammonium polyphosphate at high temperature and high pressure, its steps are as follows:
[0031] (1) Raw material drying: the ammonium polyphosphate powder with an average degree of polymerization of 20 (i.e. ammonium polyphosphate powder with a low degree of polymerization) is dried in an infrared oven.
[0032] (2) Dry pressing molding: pass the dried ammonium polyphosphate powder with a low degree of polymerization through a steel mold, and press it under a pressure of 20 MPa to form a cylindrical mold.
[0033] (3) Synthetic cavity assembly (see figure 1 ): the dolomite tube 7 is packed into the hole of the pyrophyllite body 6 whose shape is a cube and the middle part is a round hole, the graphite heating tube 8 is packed into the dolomite tube 7, and the cubic boron nitride heat transfer tube 2 is packed Put into the graphite heating tube 8, put the blank mold 9 (the cylindrical blank mold prepared in step ...
Embodiment 2
[0040] The method for synthesizing high degree of polymerization ammonium polyphosphate at high temperature and high pressure, its steps are as follows:
[0041] (1) Raw material drying: the ammonium polyphosphate powder with an average degree of polymerization of 50 (i.e. ammonium polyphosphate powder with a low degree of polymerization) is dried in a vacuum oven.
[0042] (2) Dry pressing molding: pass the dried ammonium polyphosphate powder with a low degree of polymerization through a steel mold, and press it under a pressure of 30 MPa to form a square blank mold.
[0043] (3) Synthetic cavity assembly (see figure 1 ): the dolomite tube 7 is packed into the hole of the pyrophyllite body 6 whose shape is a cube and the middle part is a round hole, the graphite heating tube 8 is packed into the dolomite tube 7, and the cubic boron nitride heat transfer tube 2 is packed Put into the graphite heating tube 8, put the blank mold 9 (the cylindrical blank mold prepared in step 2)...
Embodiment 3
[0050] The method for synthesizing high degree of polymerization ammonium polyphosphate at high temperature and high pressure, its steps are as follows:
[0051] (1) Raw material drying: the ammonium polyphosphate powder with an average degree of polymerization of 80 (that is, ammonium polyphosphate powder with a low degree of polymerization) is dried in an ordinary oven.
[0052] (2) Dry pressing: pass the dried ammonium polyphosphate powder with a low degree of polymerization through a steel mold, and press it under a pressure of 30 MPa to form a rectangular mold.
[0053] (3) Synthetic cavity assembly (see figure 1 ): the dolomite tube 7 is packed into the hole of the pyrophyllite body 6 whose shape is a cube and the middle part is a round hole, the graphite heating tube 8 is packed into the dolomite tube 7, and the cubic boron nitride heat transfer tube 2 is packed Put into the graphite heating tube 8, put the blank mold 9 (the cylindrical blank mold prepared in step 2) i...
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