KR20220084702A - Ultraviolet protecting powder and method for manufacturing the same - Google Patents

Abstract

The present invention relates to a UV blocking powder and a method for preparing the same, and specifically, to a porous silica having pores; a chemical sunscreen having a solid state at room temperature supported in the pores of the porous silica; and a silica coating layer using Silicic Acid coated on the surface of the porous silica supported in the pores by the chemical sunscreen.
According to the present invention, it has excellent UV protection performance and can fundamentally solve the health and ecosystem threats caused by microplastics. It is possible to provide a UV-blocking powder with excellent stability and excellent feeling of use.

Description

Ultraviolet protecting powder and method for manufacturing the same}

The present invention relates to a UV-blocking powder and a method for manufacturing the same. Specifically, it has excellent UV-blocking performance, can fundamentally solve health and ecological threats caused by microplastics, and in particular, a chemical UV-blocking agent because of the excellent surface strength of the silica coating layer. It relates to a UV-blocking powder having excellent stability and feeling of use, and a method for manufacturing the same, and a cosmetic comprising the UV-blocking powder.

The content described below merely provides background information related to the present invention and does not constitute the prior art.

In general, about 1% of sunlight reaching the earth's surface is harmful to the human body.

Ultraviolet light has a shorter wavelength than visible light or infrared light, and the energy of light is inversely proportional to the wavelength, so ultraviolet light has higher energy than visible light or infrared light.

Therefore, the more ultraviolet rays are irradiated to a person, the more various chemical reactions can occur due to the large energy of ultraviolet rays, which can induce physiological changes.

Because UV rays have high energy, they activate various chemicals to change their structure or paralyze their functions.

In particular, organic pigments widely used in cosmetics and household products are substances that easily lose their original functions by being sensitized and activated by ultraviolet rays.

For this reason, sunscreens have been used as essential in the formulation of cosmetics and household products for a long time.

In recent years, as the amount of UV irradiation on the surface due to ozone layer depletion increases, the market for products whose main purpose is UV protection is growing significantly every year.

Most organic sunscreens can cause physiological damage when in direct contact with the human body.

In addition, sunscreen has poor stability to heat and light, and its solubility in solvents is not good, so there is a limit to how to use it and the feeling of use is bad.

In order to overcome these problems, Korean Patent Application No. 10-2009-0059107 discloses a composite pigment in which an organic sunscreen is supported on hollow silica. There is a problem in that the skin stability is lowered by direct contact with the skin, and the photostability and thermal stability are lowered.

In addition, the present applicant's Korean Patent No. 10-0890428 discloses a composite particle in which a chemical sunscreen is hybridized inside a polymer. There is an urgent need for a sunscreen that has excellent UV protection performance and does not cause skin irritation.

In addition, in Korean Patent Publication No. 10-2017-0034640, a mesoporous silica molecular sieve and a mesoporous silica composite powder including a titanium dioxide (TiO2) coating layer on the silica molecular sieve are developed, and Korean Patent Publication No. 10-2018-0126270 porous silica; an inorganic sunscreen doped on the surface of the pores of the porous silica; an organic sunscreen impregnated in the pores of the porous silica; And a silica-based composite powder for blocking ultraviolet rays including a coating layer coated on the outer surface of the porous silica has been disclosed, but the surface coating layer is easily broken due to the weak surface strength of the coating layer, and the risk of skin irritation is high, and the feeling of use is poor. This is being requested.

The technical problem to be achieved by the present invention is that it has excellent UV protection performance and can fundamentally solve health and ecological threats caused by microplastics. An object of the present invention is to provide a UV-blocking powder having no risk of skin irritation, excellent stability, and excellent feeling of use, a method for manufacturing the same, and a cosmetic comprising the UV-blocking powder.

The present invention for achieving this technical task is

In the UV blocking powder,

porous silica having pores;

a chemical sunscreen having a solid state at room temperature supported in the pores of the porous silica; and

It provides a UV-blocking powder comprising; a silica coating layer using Silicic Acid coated on the surface of the porous silica supported in the pores by the chemical UV-blocking agent.

In addition, the UV blocking powder may further include an organic coating layer or an inorganic coating layer on the surface of the silica coating layer.

The UV blocking powder may further include a surfactant between the porous silica and the silica coating layer.

Preferably, the UV blocking powder has a viscoelasticity of 50 to 900 g force / um ² (product name: MCT-W500-E, manufacturer: shimadzu).

Also, the present invention

S1) a step of supporting a chemical sunscreen agent in a solid state at room temperature in the pores of the porous silica;

S2) preparing an aqueous solution of Silicic Acid; and

S3) forming a silica coating layer by reacting an aqueous solution of Silicic Acid with the porous silica in which the chemical sunscreen is supported in the pores;

It provides a method for producing a UV-blocking powder comprising a.

In step S3), the surfactant may be further mixed and reacted.

In step S3), a reaction stabilizer may be further mixed and reacted.

In addition, the manufacturing method

After step S3), S4) forming an organic coating layer or an inorganic coating layer on the surface of the silica coating layer; may include.

In addition, the present invention provides a cosmetic comprising the above-mentioned UV-blocking powder.

According to the present invention, it has excellent UV protection performance and can fundamentally solve the health and ecosystem threats caused by microplastics. It is possible to provide a UV-blocking powder having excellent stability and feeling of use, a manufacturing method thereof, and a cosmetic comprising the UV-blocking powder.

1 shows a schematic diagram of a UV blocking powder according to an embodiment of the present invention.
Figure 2 shows a schematic diagram of a UV blocking powder according to another embodiment of the present invention.
Figure 3 shows a schematic diagram of a method for manufacturing a UV-blocking powder according to an embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings, the embodiments of the present invention will be described in detail so that those of ordinary skill in the art to which the present invention pertains can easily implement them. However, the present invention may be embodied in several different forms and is not limited to the embodiments described herein. And in order to clearly explain the present invention in the drawings, parts irrelevant to the description are omitted, and similar reference numerals are attached to similar parts throughout the specification.

Throughout the specification, when a part "includes" a certain element, it means that other elements may be further included, rather than excluding other elements, unless otherwise stated.

1 shows a schematic diagram of a UV blocking powder according to an embodiment of the present invention, FIG. 2 is a schematic diagram of a UV blocking powder according to another embodiment of the present invention, and FIG. 3 is an embodiment of the present invention It shows a schematic diagram of a method for manufacturing a UV-blocking powder according to the following.

The UV blocking powder 100 of the present invention is

In the UV blocking powder,

porous silica 10 having pores;

a chemical sunscreen 20 having a solid state at room temperature supported in the pores of the porous silica; and

and a silica coating layer (30) using silica acid coated on the surface of the porous silica supported in the pores by the chemical sunscreen.

Specifically, the pores of the porous silica 10 may be 10 to 90% may be used, and the content of the chemical sunscreen 20 to be supported may be adjusted according to the use of the product.

The content of the chemical sunscreen 20 supported on the porous silica 10 may be arbitrarily controlled, and specifically, it may be supported in an amount of 10 to 200 parts by weight based on 100 parts by weight of the porous silica 10 .

As the chemical sunscreen 20 having a solid state at room temperature, a known chemical sunscreen may be used, and specifically, butylmethoxydibenzoylmethane, ethylhexylmethoxycinnamate, ethylhexyl silicate, octyldimethyl para-aminobenzo Iksan, octylmethoxycinnamate, octylsalicylate, octocrylene, butylmethoxydibenzoylmethane, oxybenzone, octyltriazone, menthylanthranilate, 3,4-methylbenzylidenekemper and bis-ethylhexyloxy It may be one or more selected from the group consisting of phenol methoxyphenyl triazine.

In addition, in the UV blocking powder 100 of the present invention, the silica coating layer 30 is formed using Silicic Acid. The Silicic Acid may be prepared by dissolving TEOS in distilled water of pH 2 to 3. In the present invention, the silica coating layer 30 is formed using Silicic Acid so that the silica coating layer 30 can be uniformly coated on the surface of the porous silica 10, and the skin due to the chemical UV blocking agent while including the chemical UV blocking agent. There is no fear of irritation, the stability is excellent, and the strength of the coating layer is excellent.

The thickness of the silica coating layer 30 may be arbitrarily adjusted. Preferably, the silica coating layer 30 may be formed in an amount of 5 to 100 parts by weight based on a total of 100 parts by weight of the porous silica 10 and the sunscreen agent 20 . In this case, the chemical sunscreen 20 can effectively prevent elution to the outside of the pores, and it has excellent stability, does not damage the color of the cosmetic, there is no restriction on the use according to the male formulation, and has excellent surface strength, so that the feeling of use is excellent. can be improved at the same time.

In addition, the UV blocking powder 100 of the present invention may further include a surfactant between the porous silica 10 and the silica coating layer 30 . Preferably, the surfactant is a nonionic surfactant, and as a specific example, the nonionic surfactant is preferably a polysorbate-based surfactant, more specifically tween 60 or tween 80. Preferably, the surfactant is used in an amount of 0.01 to 1 part by weight based on 100 parts by weight of the porous silica 10 in which the chemical sunscreen 20 is supported in the pores. In this case, the silica coating layer 30 may be uniformly coated on the surface of the porous silica 10 , and there is no concern of skin irritation due to the chemical UV blocking agent while including the chemical UV blocking agent, and the stability is excellent.

In addition, the UV blocking powder 100 of the present invention may further include an organic coating layer 40 or an inorganic coating layer 40 on the surface of the silica coating layer 30 .

The organic coating layer 40 may be formed of an organic coating layer 40 using a known organic material, and the thickness of the organic coating layer 40 may be arbitrarily adjusted.

Specifically, the coating material of the organic coating layer 40 is cetyl alcohol, lauryl alcohol, myristyl alcohol, lauryl-myristyl alcohol, lauryl-cetyl alcohol, capryl Monohydric alcohol and/or hexanediol, including caprylic alcohol, capric alcohol, stearyl alcohol, cetyl-stearyl alcohol and decyl alcohol; It may be selected from dihydric alcohols including propanediol, butanediol, pentanediol, and octanediol, but is not limited thereto. More preferably, the organic coating layer 40 may be an organic coating layer 40 coated with cetyl alcohol, and the organic coating layer 40 is a total of 100 parts by weight of the porous silica 10 and the sunscreen agent 20. It may be formed in 5 to 50 parts by weight. In this case, the feeling of use of the cosmetic can be improved at the same time.

A known inorganic coating material may be used as the inorganic coating layer 40 , and the thickness of the organic coating layer 40 may be arbitrarily adjusted.

Specifically, the inorganic coating layer 40 may be formed of a silane compound or may be formed of titanium dioxide or zinc oxide, and the inorganic coating layer 40 is 5 based on 100 parts by weight of the total of the porous silica 10 and the sunscreen 20 to 100 parts by weight. In this case, the stability of the cosmetic can be further improved.

Preferably, the UV blocking powder 100 of the present invention has viscoelasticity (product name: MCT-W500-E, manufacturer: shimadzu) of 50 to 900 g force / um ² . In this case, it is possible to effectively prevent the chemical UV blocker 20 from eluting to the outside of the pores, but also to have excellent stability and excellent surface strength, so that the feeling of use of the cosmetic can be improved at the same time. More preferably, the sunscreen powder 100 of the present invention has viscoelasticity (product name: MCT-W500-E, manufacturer: shimadzu) of 300 to 900 g force / um ² .

In addition, the present invention provides a method of manufacturing the UV blocking powder (100).

The manufacturing method of the UV blocking powder 100 of the present invention is

S1) supporting the chemical sunscreen agent 20 in a solid state at room temperature in the pores of the porous silica 10;

S2) preparing an aqueous solution of Silicic Acid; and

S3) forming a silica coating layer 30 by reacting an aqueous solution of Silicic Acid with the porous silica 10 on which a chemical sunscreen is supported in the pores;

includes

In addition, if necessary, the manufacturing method may further include the step of evaporating moisture by drying the porous silica 10 before step S1).

In the present invention, a known method can be applied to the method of supporting the chemical sunscreen agent 20 in the pores of the porous silica 10. Specifically, the chemical sunscreen agent 20 and the porous silica 10 are mixed in a Henschel mixer. After stirring at a temperature above the melting point of the chemical sunscreen 20 and below the pyrolysis temperature and then cooling, the chemical sunscreen 20 may be loaded into the pores of the porous silica 10, and more specifically, about 60 to 100 ℃ and stirred at 200 to 500 RPM and then cooled, the chemical sunscreen agent 20 may be loaded into the pores of the porous silica 10 .

In the present invention, step S2) is a step of preparing an aqueous solution of silicic acid. In the present invention, the silica coating layer 30 is formed using an aqueous solution of Silicic Acid, and the aqueous solution of Silicic Acid can be prepared by dissolving TEOS in distilled water having a pH of 2-3 while stirring. When the silica coating layer 30 is formed with the silica acid, the stability of the UV blocking powder can be further improved while having excellent strength.

In the present invention, the step of forming the silica coating layer 30 by reacting the porous silica 10 on which the chemical sunscreen 20 is supported in the pores S3) with an aqueous solution of Silicic Acid in the present invention S3) can be applied by known coating methods. As a specific example, the reaction may be performed by mixing the porous silica 10 on which the chemical sunscreen 20 is supported and the aqueous solution of Silicic Acid in a reactor. Preferably, the reaction is carried out at a pH of 5.5 to 6.8. In this case, the silica coating layer 30 may be uniformly coated on the surface of the porous silica 10 , and there is no concern of skin irritation due to the chemical UV blocking agent while including the chemical UV blocking agent, and the stability is excellent.

Preferably, in step S3), a surfactant is further mixed and reacted. The surfactant is a nonionic surfactant, and specifically, the nonionic surfactant is preferably a polysorbate-based surfactant, more specifically tween 60 or tween 80. Preferably, the surfactant is used in an amount of 0.01 to 1 part by weight based on 100 parts by weight of the porous silica 10 in which the chemical sunscreen 20 is supported in the pores. In this case, the silica coating layer 30 may be uniformly coated on the surface of the porous silica 10 , and there is no concern of skin irritation due to the chemical UV blocking agent while including the chemical UV blocking agent, and the stability is excellent.

In addition, when the chemical sunscreen 20 is avobenzone, step S3) may be to further mix and react a reaction stabilizer. Specifically, the reaction stabilizer is EDTA-Na. Preferably, the reaction stabilizer is used in an amount of 0.001 to 1 part by weight based on 100 parts by weight of the porous silica 10 in which the chemical sunscreen 20 is supported in the pores. In this case, a chemical side reaction is prevented, the silica coating layer 30 is uniformly formed, and the stability is excellent.

After step S3), S4) forming an organic coating layer 40 or an inorganic coating layer 40 on the surface of the silica coating layer 30; may include.

In addition, the coating material of the organic coating layer 40 in the present invention is specifically cetyl alcohol (Cetyl alcohol), lauryl alcohol (Lauryl alcohol), myristyl alcohol (Myristyl alcohol), lauryl-myristyl alcohol, lauryl-cetyl Monohydric alcohol and/or hexanediol including alcohol, caprylic alcohol, capric alcohol, stearyl alcohol, cetyl-stearyl alcohol and decyl alcohol (Hexanediol), propanediol (propanediol), butanediol (butanediol), may be selected from dihydric alcohols including pentanediol (pentandiol) and octanediol (octanediol), but is not limited thereto. Preferably, the organic coating may be a coating using cetyl alcohol. In this case, the stability of the UV-blocking powder in the cosmetic can be further improved.

In addition, the inorganic coating layer 40 may be formed of a silane compound or titanium dioxide or zinc oxide, and the inorganic coating layer 40 is 5 to 100 parts by weight of the total of the porous silica 10 and the sunscreen 20 It may be formed in 100 parts by weight. In this case, the stability of the cosmetic can be further improved.

In addition, in the present invention, step S3) and/or step S4); Separating the UV-blocking powder 100 formed thereafter; Or drying the UV-blocking powder 100; may further include.

For the separation or drying, a conventional powder separation method and drying method may be applied.

In addition, the present invention provides a cosmetic comprising the ultraviolet blocking powder (100). In the cosmetic comprising the UV blocking powder 100 of the present invention, the content of the UV blocking powder 100 can be arbitrarily adjusted. In particular, the cosmetic according to the present invention has excellent surface strength of the silica coating layer 30, so that there is no concern of skin irritation due to the chemical sunscreen while including the chemical sunscreen 20, and has excellent stability and excellent feeling of use, so it can be formulated in various formulations. can be manufactured with

Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements by those skilled in the art using the basic concept of the present invention as defined in the following claims are also provided. is within the scope of the right.

Claims (9)

In the UV blocking powder,
porous silica having pores;
a chemical sunscreen having a solid state at room temperature supported in the pores of the porous silica; and
A UV blocking powder comprising a silica coating layer using Silicic Acid coated on the surface of the porous silica in which the chemical UV blocking agent is supported in pores. The method of claim 1,
UV blocking powder, characterized in that it further comprises an organic coating layer or an inorganic coating layer on the surface of the silica coating layer. The method of claim 1,
UV blocking powder, characterized in that it further comprises a surfactant between the porous silica and the silica coating layer. The method of claim 1,
The UV blocking powder is a UV blocking powder, characterized in that it has a viscoelasticity of 50 to 900 g force / um ² (product name: MCT-W500-E, manufacturer: shimadzu company). S1) supporting a chemical sunscreen agent in a solid state at room temperature on the pores of the porous silica;
S2) preparing an aqueous solution of Silicic Acid; and
S3) forming a silica coating layer by reacting an aqueous solution of Silicic Acid with the porous silica in which the chemical sunscreen is supported in the pores;
A method for producing a UV-blocking powder comprising a. 6. The method of claim 5,
The step S3) is a method for producing a UV-blocking powder, characterized in that the reaction is further mixed with a surfactant. 6. The method of claim 5,
The step S3) is a method for producing a UV-blocking powder, characterized in that the reaction is further mixed with a reaction stabilizer. 6. The method of claim 5,
After the step S3), S4) forming an organic coating layer or an inorganic coating layer on the surface of the silica coating layer; A cosmetic comprising the UV-blocking powder according to any one of claims 1 to 4.

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