Hydroxyapatite-chitosan compound gel and preparation process and application thereof
The technology of hydroxyapatite and composite gel is applied in the fields of biomedicine and daily necessities, and can solve the problems of difficult biodegradation, adsorption and remineralization, unsuitable for clinical medical treatment, etc. The effect of improving the symptoms of bleeding gums
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Embodiment 1
[0136] The preparation method of modified hydroxyapatite described in this embodiment comprises the following steps:
[0137] (a) Weigh 200 kg of hydroxyapatite and 2 kg of aluminum hydroxide, add 2.5 times by weight of concentrated nitric acid (commercially available) with a mass concentration of about 68%, stir to dissolve completely, and obtain liquid C;
[0138] (b) Weigh 45 kg of sodium chloride, 6 kg of potassium chloride, and 45 kg of magnesium chloride and mix evenly, add 3 times the amount of purified water by weight, stir to completely dissolve, filter to obtain liquid D;
[0139] (c) Mix the above liquid C and liquid D, add 10% sodium hydroxide solution to adjust its pH value to ≥10, and form a white suspension;
[0140] (d) After continuously stirring the suspension at 30 rpm for 3 hours, stop stirring, leave the material to stand and age at room temperature for 24 hours, filter under pressure filtration, take the precipitate and wash it with deionized water until ...
Embodiment 2
[0142] The preparation method of modified hydroxyapatite described in this embodiment comprises the following steps:
[0143] (a) Weigh 100 kg of hydroxyapatite and 5 kg of aluminum hydroxide, add 4 times by weight of concentrated nitric acid (commercially available) with a mass concentration of about 68%, stir to dissolve completely, and obtain liquid C;
[0144] (b) Take by weighing 20 kg of sodium chloride, 2 kg of potassium chloride, and 20 kg of magnesium chloride, add 5 times the amount of purified water by weight, stir to completely dissolve, filter to obtain liquid D;
[0145] (c) Mix the above liquid C and liquid D, add 25% sodium hydroxide solution to adjust its pH value to ≥10, and form a white suspension;
[0146] (d) After the suspension was continuously stirred at 50rpm for 2 hours, the stirring was stopped, and the material was left to age at room temperature for 48 hours, filtered by pressure filtration, and the precipitate was washed with deionized water until...
Embodiment 3
[0148] The preparation method of modified hydroxyapatite described in this embodiment comprises the following steps:
[0149] (a) Weigh 100 kg of hydroxyapatite and 1 kg of aluminum hydroxide, add 2 times by weight of concentrated nitric acid (commercially available) with a mass concentration of about 68%, stir to dissolve completely, and obtain liquid C;
[0150] (b) Weigh 70 kg of sodium chloride, 10 kg of potassium chloride, and 70 kg of magnesium chloride, add 2 times the amount of purified water by weight, stir to completely dissolve, filter to obtain liquid D;
[0151] (c) Mix the above liquid C and liquid D, add 5% sodium hydroxide solution to adjust its pH value to ≥10, and form a white suspension;
[0152] (d) After the suspension was continuously stirred at 20 rpm for 6 hours, the stirring was stopped, and the material was left to age at room temperature for 12 hours, filtered by pressure filtration, and the precipitate was washed with deionized water until the filtr...
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