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Preparation method of wax beads embedded with chemical sun-screening agent and loaded with nano titanium dioxide on surfaces and use of wax beads in sun-screening cream

A technology of nano-titanium dioxide and chemical sunscreen, applied in cosmetic preparations, skin care preparations, medical preparations containing active ingredients, etc., can solve the problems of emulsion stability, milk droplet size, and microsphere difficulties, etc., to achieve delay Photodegradation rate, effect of reducing skin residue

Active Publication Date: 2021-03-26
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the difficulty of using nano-TiO 2 Prepare a stable Pickering emulsion with a controllable particle size, and the environment of the particles in the emulsion system, such as the pH value and ionic strength of the water phase, the oil-water ratio, the type of oil, and the concentration of the particles, have an impact on the stability of the emulsion and the size of the emulsion droplet. Influence, currently one-step synthesis of loaded nano-TiO with suitable particle size by Pickering emulsion 2 Difficulty with microspheres

Method used

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  • Preparation method of wax beads embedded with chemical sun-screening agent and loaded with nano titanium dioxide on surfaces and use of wax beads in sun-screening cream
  • Preparation method of wax beads embedded with chemical sun-screening agent and loaded with nano titanium dioxide on surfaces and use of wax beads in sun-screening cream
  • Preparation method of wax beads embedded with chemical sun-screening agent and loaded with nano titanium dioxide on surfaces and use of wax beads in sun-screening cream

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Embodiment 1

[0038] Table 1 Reagent specification and source of the present invention

[0039] Reagent Specification Manufacturer TiO 2 -Ⅰ

≥99.8%, anatase, 10-25nm Aladdin Chemical Reagent Co., Ltd. TiO 2 -Ⅱ

≥99.5%, P25, mixed crystal, ~20nm Evonik Industries TiO 2 -Ⅲ

≥99.0%, anatase, 15-25nm Fenfeng Nano Co., Ltd. TiO 2 -IV

≥99.0%, rutile, ~20nm Jiangsu Tianxing New Material Co., Ltd. carnauba wax Melting point: 82.5~86℃, food grade Shanghai Jiujie Industrial Co., Ltd.

[0040] TiO 2Preparation of Stable Pickering Emulsion: Weigh TiO 2 Ultrasonic dispersion of nanoparticles in water, adjust the pH value, and add to the oil phase; then homogenize at 20000rpm for 2min to obtain TiO 2 For a stable Pickering emulsion, the concentration of particles is expressed as the mass fraction of particles in the aqueous phase.

[0041] TiO 2 Preparation of @Wax-AVB microspheres: weigh 6g of carnauba wax and 4g of avobenzon...

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Abstract

The invention discloses a preparation method of wax beads embedded with a chemical sun-screening agent and loaded with nano titanium dioxide on surfaces and use of the wax beads in sun-screening cream. The preparation method comprises the following steps: weighing carnauba wax and avobenzone, and performing heating and melting to obtain an oil phase; weighing unmodified titanium dioxide, dispersing the unmodified titanium dioxide in water, adjusting a pH value to 5.0-5.5, performing heating on a water bath, and dispersing the titanium dioxide to obtain a water phase; pouring the heated oil phase into a water phase and performing homogenizing; and pouring an obtained mixture into water for rapid solidification after the homogenization. Under conditions that no co-emulsifier and surfactantsare added and TiO2 is not modified, the wax beads can obviously delay a light degradation rate of AVB and reduce a skin residue of TiO2.

Description

technical field [0001] The invention belongs to the technical field of sunscreen preparation, and in particular relates to a preparation method of wax beads embedded with chemical sunscreens and loaded with nano-titanium dioxide on the surface and their application in sunscreens. Background technique [0002] Compared with traditional emulsions (stabilized by surfactants), Pickering emulsions have many advantages such as lower emulsifier usage, lower biotoxicity or irritation, more functionality, and higher physical / chemical stability , which can provide a good platform for the preparation of new multifunctional emulsions and composite materials. Nanoparticle-loaded microspheres are an important class of raw materials for cosmetics. They have the functions of loading functional substances and adjusting skin feel, and usually need to be prepared by a two-step method; while Pickering emulsion polymerization or curing is a one-step preparation of nanoparticle-loaded microsphere...

Claims

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Application Information

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IPC IPC(8): A61K8/29A61K8/35A61K8/92A61Q17/04
CPCA61K8/922A61K8/35A61K8/29A61Q17/04A61K2800/56
Inventor 王靖喻明英杨成
Owner JIANGNAN UNIV
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