Temperature-controlled slow-release mesoporous silica nano-flavor and preparation method thereof
A technology of mesoporous silica and silica, which is applied in the direction of essential oil/fragrance, fat production, etc., can solve the problems of uncontrollable fragrance release process and poor long-lasting fragrance, and achieve long fragrance retention time and high loading rate , Ease of use
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[0019] Specifically, the present invention provides a method for preparing temperature-sensitive slow-release mesoporous silica nano spices, comprising the following steps:
[0020] (1) Using surfactant as template, orthosilicate and silane coupling agent with terminal amino group as silicon source, under alkaline environment, prepare nano-mesoporous modified with terminal amino group by sol-gel method Silica spheres;
[0021] (2) After the acylation reaction of the nano mesoporous silica spheres modified by the terminal amino group and 2-bromo-2-methylpropionyl bromide, through the atom transfer radical polymerization method, in the nano mesoporous The surface of the silica sphere is modified with a temperature-sensitive polymer to obtain a temperature-sensitive nanometer mesoporous silica sphere;
[0022] (3) The temperature-sensitive nano-mesoporous silica spheres are loaded with perfume to obtain temperature-controlled and slow-release mesoporous silica nano-spice.
[00...
Embodiment 1
[0037] In this example, the temperature-controlled slow-release mesoporous silica nano-spice was prepared by the following steps:
[0038] (1) Preparation of nanometer mesoporous silica spheres modified by terminal amino groups:
[0039] 1. Dissolve 1.0 g of cetyltrimethylammonium bromide in 160 ml of deionized water, then add 7 ml of ammonia water with a mass fraction of 28%, and ultrasonically dissolve to obtain a surfactant sol. 2. After 30 minutes, dissolve 3ml of tetraethylorthosilicate and 2ml of 3-aminopropyltriethoxysilane in 20ml of n-hexane, and add them dropwise to the above surfactant sol during stirring. 3. After reacting at 35°C for 12 hours, the filter residue was collected by filtration and fully washed with 95% ethanol solution and deionized water. 4. Then disperse the filter residue into 100mL ethanol and 1mL concentrated hydrochloric acid and heat to 80°C. This step is repeated three times to obtain purified nano-mesoporous silica spheres modified with term...
Embodiment 2～3
[0046] Examples 2 and 3 are similar to Example 1, the only difference being: the reaction temperature of the sol-gel method during the preparation of the terminal amino-modified nano-mesoporous silica spheres, as shown in Table 1:
[0047] Table 1
[0048]
[0049] In addition, in the above embodiments of the present invention, the organic solvent may also be other organic solvents with similar properties in the field, which can also achieve substantially equivalent effects, and is not limited thereto.
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