Preparation method of carbon nitride/nanometer zinc oxide ultraviolet shielding agent close to skin color
A nano-zinc oxide, ultraviolet shielding agent technology, applied in skin care preparations, chemical instruments and methods, zinc oxide/zinc hydroxide and other directions, can solve the problems of paleness and unnaturalness, easy precipitation of pigments, affecting performance, etc. To achieve the effect of simple preparation process, simple post-processing and large output
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Embodiment 1
[0022] The preparation method of the near skin color carbon nitride / nano-zinc oxide ultraviolet shielding agent of the present embodiment, the steps are as follows:
[0023] (1) Dissolve melamine and thiourea in deionized water at a ratio of 1:0.1 (molar ratio), stir evenly, transfer the above solution to a reaction kettle at 180°C for 12 hours, cool to room temperature and filter, and filter the obtained The cake was calcined at 520°C for 3 hours to obtain carbon nitride;
[0024] (2) Fully grind the carbon nitride and zinc chloride obtained above (the mass ratio of carbon nitride to zinc chloride is 5%) in an agate mortar, put the ground powder in a crucible, and heat at 350°C Calcining at low temperature for 2 hours, you can get nano carbon nitride / zinc oxide UV shielding agent with close skin color.
Embodiment 2
[0026] The preparation method of the near skin color carbon nitride / nano-zinc oxide ultraviolet shielding agent of the present embodiment, the steps are as follows:
[0027] (1) Dissolve melamine and thiourea in deionized water at a ratio of 1:3 (molar ratio), stir evenly, transfer the above solution to a reaction kettle at 180°C for 12 hours, cool to room temperature and filter, and filter the obtained The cake was calcined at 520°C for 3 hours to obtain carbon nitride;
[0028] (2) Fully grind the carbon nitride and zinc chloride obtained above (the mass ratio of carbon nitride to zinc chloride is 25%) in an agate mortar, put the ground powder in a crucible, and heat at 400°C Calcining at low temperature for 2 hours, the carbon nitride / nanometer zinc oxide ultraviolet shielding agent with close skin color can be obtained.
Embodiment 3
[0030] The preparation method of the near skin color carbon nitride / nano-zinc oxide ultraviolet shielding agent of the present embodiment, the steps are as follows:
[0031] (1) Dissolve melamine and thiourea in deionized water at a ratio of 1:6 (molar ratio), stir evenly, transfer the above solution to a reaction kettle at 180°C for 12 hours, cool to room temperature and filter, and filter the obtained The cake was calcined at 520°C for 3 hours to obtain carbon nitride;
[0032] (2) Fully grind the carbon nitride and zinc chloride obtained above (the mass ratio of carbon nitride to zinc chloride is 50%) in an agate mortar, put the ground powder in a crucible, and heat at 500°C Calcining at low temperature for 2 hours, the carbon nitride / nanometer zinc oxide ultraviolet shielding agent with close skin color can be obtained.
[0033] As a comparison (relative to Example 1), without adding carbon nitride, fully grind zinc chloride in an agate mortar, place the ground powder in ...
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