A kind of preparation method of layered octahedral aragonite crystal and obtained product
An octahedral and aragonite technology, which is applied in the field of preparation of layered octahedral aragonite crystals, can solve the problems of complex process, no layered octahedral aragonite crystal preparation and morphology, etc., and achieves simple process, chemical and physical And the effect of excellent mechanical properties and good compatibility
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Embodiment 1
[0030] A preparation method for layered octahedral aragonite crystals, comprising the following steps:
[0031] (1) Weigh hydroxypropyl cellulose with a degree of substitution of 1.8, add it to water and stir until the solution is colorless and transparent, and prepare a HPC solution with a concentration of 0.2wt%;
[0032] (2) CaCl 2 Soluble in the above HPC solution, CaCl 2 The concentration is 0.01mol / L;
[0033] (3) Heat the solution in step (2) to 95°C, stir at 200r / min, add 0.01mol / L Na at a rate of 2.0mL / min 2 CO 3 Aqueous solution is added in the solution of step (2);
[0034] (4) Na 2 CO 3After adding the aqueous solution, continue aging at 95°C for 0.5h, and then wash twice with water to obtain branched aragonite. The SEM image of the obtained branched aragonite is as follows figure 2 shown;
[0035] (5) Add branched aragonite to 10wt% NaOH aqueous solution, treat at room temperature for 3 days, then wash and dry to obtain layered octahedral aragonite crysta...
Embodiment 2
[0037] A preparation method for layered octahedral aragonite crystals, comprising the following steps:
[0038] (1) Weigh hydroxypropyl cellulose with a degree of substitution of 1.5, add it to water and stir until the solution is colorless and transparent, and prepare a HPC solution with a concentration of 0.3wt%;
[0039] (2) CaCl 2 Soluble in the above HPC solution, CaCl 2 The concentration is 0.2mol / L;
[0040] (3) Heat the solution in step (2) to 80°C, stir at 300r / min, add 0.2mol / L Na at a rate of 1.0mL / min 2 CO 3 Aqueous solution is added in the solution of step (2);
[0041] (4) Na 2 CO 3 After adding the aqueous solution, continue aging at 80°C for 1 hour, and then wash with water twice to obtain branched aragonite;
[0042] (5) Add branched aragonite to 12wt% NaOH aqueous solution, treat at room temperature for 6 days, then wash and dry to obtain layered octahedral aragonite crystals. The product morphology is similar to that of figure 1 Similar, evenly dispe...
Embodiment 3
[0044] A preparation method for layered octahedral aragonite crystals, comprising the following steps:
[0045] (1) Weigh hydroxypropyl cellulose with a degree of substitution of 1.0, add it to water and stir until the solution is colorless and transparent, and prepare an HPC solution with a concentration of 0.4wt%;
[0046] (2) CaCl 2 Soluble in the above HPC solution, CaCl 2 The concentration is 0.015mol / L;
[0047] (3) Heat the solution in step (2) to 75°C, stir at 250r / min, and add Na with a concentration of 0.015mol / L at a rate of 1.2mL / min 2 CO 3 Aqueous solution is added in the solution of step (2);
[0048] (4) Na 2 CO 3 After adding the aqueous solution, continue aging at 75°C for 1.5h, then wash twice with water to obtain branched aragonite; (5) add branched aragonite to 15wt% NaOH aqueous solution, treat at room temperature for 8 days, then wash and dry, Obtained layered octahedral aragonite crystals, product morphology and figure 1 Similarly, the dispersion...
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