CN-121975579-A - Silicon-based aerogel-microemulsion composite material and preparation method thereof

Abstract

The invention relates to the technical field of perfume, in particular to a silicon-based aerogel-microemulsion composite material and a preparation method thereof, wherein the method comprises the steps of providing a blocky silicon-based aerogel; dissolving hydroxypropyl-beta-cyclodextrin in deionized water as solvent to obtain clear solution, adding perfume into the clear solution, adding surfactant, mixing under stirring to obtain perfume-loaded microemulsion, placing the massive silica-based aerogel into a container, pouring the perfume-loaded microemulsion into the container to completely submerge the aerogel, sealing, standing at room temperature for adsorption, and obtaining the silica-based aerogel-microemulsion composite material after adsorption is completed. The method inhibits the initial burst release of the perfume through a double mechanism of physical adsorption and supermolecule inclusion, and realizes gradual regulation and control of the perfume release behavior and lasting fragrance retention.

Inventors

• LI HONGLI
• JIANG HAO
• WU JINFENG
• XIE DAN
• ZHOU HAO
• MA MING
• NIE CHAOYIN

Assignees

• 重庆中烟工业有限责任公司

Dates

Publication Date

20260505

Application Date

20260123

Claims (7)

1. 1. The preparation method of the silicon-based aerogel-microemulsion composite material is characterized by comprising the following steps of: providing a silicon-based aerogel; Dissolving hydroxypropyl-beta-cyclodextrin in deionized water as solvent to obtain clear solution, adding perfume into the clear solution, adding surfactant, and mixing under stirring to obtain perfume-loaded microemulsion; Placing the silicon-based aerogel in a container, pouring the perfume-loaded microemulsion into the container to completely submerge the silicon-based aerogel, sealing, standing and adsorbing at room temperature, and obtaining the silicon-based aerogel-microemulsion composite material after adsorption is completed.
2. 2. The method for preparing a silica-based aerogel-microemulsion composite material according to claim 1, wherein said silica-based aerogel is prepared from ethyl orthosilicate based on a sol-gel reaction, wherein propylene oxide is added in a sol stage to promote gelation, and normal pressure drying is adopted to prepare the silica-based aerogel.
3. 3. The method of preparing a silica-based aerogel-microemulsion composite as claimed in claim 1, wherein the perfume comprises at least one of pure ethyl acetate, limonene, linalool, vanillin or menthol.
4. 4. The method of claim 1, wherein the surfactant comprises at least one of Tween 80, tween 20 or span 80.
5. 5. The method for preparing a silica-based aerogel-microemulsion composite according to claim 1, wherein said perfume-loaded microemulsion is composed of 20-40wt% of hydroxypropyl-beta-cyclodextrin, 5-10wt% of perfume, 8-15wt% of surfactant, and the balance of deionized water.
6. 6. The method for preparing the silica-based aerogel-microemulsion composite material according to claim 1, wherein the standing adsorption time is 24-36 hours.
7. 7. A silicon-based aerogel-microemulsion composite material is characterized by being prepared by the preparation method of the silicon-based aerogel-microemulsion composite material as claimed in any one of claims 1-6.

Description

Silicon-based aerogel-microemulsion composite material and preparation method thereof Technical Field The invention relates to the technical field of fragrances, in particular to a silicon-based aerogel-microemulsion composite material and a preparation method thereof. Background The essence and spice are used as an important functional additive and are widely applied to the fields of foods, medicines, cosmetics, daily chemicals, tobacco and the like. However, most perfume molecules have the characteristics of low boiling point, high vapor pressure, high volatility and the like, for example, the vapor pressure of ethyl acetate at 20 ℃ is about 10.10 kPa, so that the perfume molecules are easy to escape in the processes of storage, transportation and use, the perfume retention time is short, and the application effect and the user experience are severely restricted. Therefore, development of a high-efficiency and controllable perfume slow-release technology for realizing long-lasting fragrance is a key technical problem to be solved in the field. At present, the slow release of perfume is mainly dependent on porous adsorption materials or emulsifying embedding systems. Although porous materials such as activated carbon and molecular sieves have certain adsorption capacity, the porous materials have obvious limitations that the activated carbon is usually derived from non-renewable mineral resources, the pore structure of the activated carbon is not adjustable and is difficult to adapt to fragrances with different molecular sizes, the molecular sieves are limited by fixed pore diameters, and only molecules with kinetic diameters smaller than pore channels of the molecular sieves are allowed to enter, so that the porous materials have poor compatibility with larger or polar fragrance molecules. In addition, the traditional porous materials exist in a powder form, so that the formability is poor, the mechanical strength is low, and the actual application and recovery are not facilitated. Disclosure of Invention The invention aims to provide a silicon-based aerogel-microemulsion composite material and a preparation method thereof, which inhibit initial burst release of perfume by a double mechanism of physical adsorption and supermolecule inclusion, and realize gradual regulation and control of perfume release behavior and lasting fragrance retention. In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: In a first aspect, the invention discloses a preparation method of a silicon-based aerogel-microemulsion composite material, which comprises the following steps: Providing a bulk silica-based aerogel; Dissolving hydroxypropyl-beta-cyclodextrin in deionized water as solvent to obtain clear solution, adding perfume into the clear solution, adding surfactant, and mixing under stirring to obtain perfume-loaded microemulsion; Placing the massive silica-based aerogel into a container, pouring the perfume-loaded microemulsion into the container to completely submerge the silica-based aerogel, sealing, standing and adsorbing at room temperature, and obtaining the silica-based aerogel-microemulsion composite material after adsorption is completed. In the technical scheme, the perfume is limited in a hydrophobic cavity of the perfume by hydroxypropyl-beta-cyclodextrin through host-guest inclusion, and then the perfume loaded microemulsion with uniform particle size is formed by stabilizing the surfactant. The perfume-loaded microemulsion is then adsorbed and confined in a hierarchical pore network of silica-based aerogels. The diffusion rate of perfume molecules to the environment is effectively delayed through a double domain limiting mechanism, the initial release intensity is greatly reduced, the cumulative release rate of perfume within 48 hours is obviously lower than that of the traditional physical adsorption system, and the perfume retention time is prolonged. Further, the bulk silica-based aerogel is prepared by a sol-gel reaction based on ethyl orthosilicate, wherein propylene oxide is added in a sol stage to promote gelation, and normal pressure drying is adopted to prepare the bulk silica-based aerogel. Traditional silicon-based aerogel is extremely easy to shrink, crack and even pulverize due to capillary force in the normal pressure drying process because of network weakness, and generally depends on expensive and time-consuming supercritical drying to maintain the porous structure. According to the invention, propylene oxide is introduced in a sol stage, and through the rapid reaction of propylene oxide and an acid/base catalyst in a system, the pH value is locally raised, the hydrolysis and polycondensation rate of a silicon source (ethyl orthosilicate) is accelerated, a more uniform three-dimensional network structure with higher crosslinking degree is promoted to be formed, and the mechanical strength and shrinkage resistance of wet gel are remarkably improve