Preparation method of essential oil-contained silicon dioxide microcapsule

A technology of silica and microcapsules, which is applied in the direction of microcapsule preparation and microsphere preparation, can solve the problems of lack of mutual adhesion and failure of Pickering emulsification effect, etc., achieve effective encapsulation, and the preparation process is fast, convenient and reliable. wide range of effects

CN103263877AActive Publication Date: 2013-08-28义乌市中力工贸有限公司
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2013-08-28

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Abstract

The invention discloses a preparation method of an essential oil-contained silicon dioxide microcapsule, which comprises the following steps: evenly mixing essential oil, a silicon dioxide precursor and co-emulsifier to obtain an oil phase mixed solution; adding acid into a silicon dioxide water dispersion solution until the pH value is regulated to 4.5-5.7, mixing with the oil phase mixed solution, and performing ultrasonic dispersion to obtain a fine emulsion; and performing closed reaction on the fine emulsion at 10-60 DEG C for 1-6 hours to obtain a colloid emulsion of the essential oil-contained silicon dioxide microcapsule. According to the invention, the liquid essential oil is contained in a hard shell of silicon dioxide; the preparation process is quick, convenient, clean and pollution-free; the essential oil-contained silicon dioxide microcapsule is small in particle size, high in structural strength and favorable in water-phase dispersibility; and the release performance adjustable range of the essential oil contained in the microcapsule is large. The preparation method disclosed by the invention is suitable for industrial large-scale production.
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Description

technical field

[0001] The invention relates to the field of preparation of microcapsules in the field of fine chemicals, in particular to a preparation method of microcapsules coated with silicon dioxide and essential oil. Background technique

[0002] Essential oils have the functions of nourishing the skin, calming irritability, improving sleep, promoting blood circulation, and enhancing functional immunity. When essential oils are used in the aromatic finishing of silk and other high-end textiles, they can give underwear, pillow covers, pajamas, ties and other fabrics to soothe and calm , hypnosis, and even physical therapy and other health effects.

[0003] However, since most essential oils are liquid oily substances at room temperature, they are highly volatile and easily oxidized in the air. Thereby direct use of natural essential oils will have many problems, such as the fluidity of liquid essential oils is too strong to be processed and used; the liquid essential ...

Examples

Embodiment 1～15

[0040] (1) Mix essential oil, silica precursor TEOS and 0.5g co-emulsifier (isohexadecane, HD) to obtain an oil phase mixture;

[0041] (2) Add acetic acid aqueous solution to the aqueous dispersion of silicon dioxide to adjust the pH to 4.5-5.7, Example 1 to adjust the pH to 4.5, Example 11 to adjust the pH to 5.7, and other examples to adjust the pH to 5, and then follow the steps (1) Mix the oil phase mixture, add an appropriate amount of water, so that the total amount after mixing is adjusted to 100g, and then put it in an ice-water bath, and disperse it by ultrasonic (ultrasonic 5s, interval 5s, effective ultrasonic time is 500s) to obtain fine Emulsion, add 0.15g of emulsifier cetyltrimethylammonium bromide (CTAB) to the microemulsion after ultrasonic dispersion;

[0042] (3) Add the fine emulsion after adding the emulsifier at a stirring rate of 200-300r·min -1 The reaction is blocked at 10° C. to 60° C. for 1 h to 6 h to obtain a highly dispersible colloidal emulsion...