Method for producing ultraviolet-blocking powder using dry process, and ultraviolet-blocking powder produced thereby

Abstract

The present invention relates to a method for manufacturing an ultraviolet-blocking powder using a dry process and an ultraviolet-blocking powder manufactured thereby, which can provide an environment-friendly property by replacing a wet process with a dry process when forming a coating layer of a powder, thereby preventing a large amount of waste water from being generated in the wet process, greatly shortening the process time, and improving the production efficiency. According to the present invention, the process energy can be saved, the coating efficiency is high, the use amount of raw materials is reduced, the production economy can be significantly improved, the ultraviolet blocking performance is excellent, the density of the coating layer is increased, the chemical ultraviolet blocking agent inside the powder is prevented from flowing to the outside, the skin irritation caused by the organic ultraviolet blocking agent is not worried, and the stability is excellent. A method for producing an ultraviolet-blocking powder having an excellent feeling of use; and an ultraviolet-blocking powder produced thereby.

Description

Technical Field

[0001] The present invention relates to a method for manufacturing an ultraviolet blocking powder using a dry process and the ultraviolet blocking powder manufactured thereby, wherein when forming a coating of the powder, since a dry process is used instead of a wet process, a large amount of waste water generated by the wet process is prevented, thereby being environmentally friendly, and the process time can be greatly shortened, process energy can be saved, the coating efficiency is high and the amount of raw materials used can be reduced, thereby significantly improving production economy, and at the same time, the ultraviolet blocking performance is excellent, the density of the coating is increased to prevent the chemical ultraviolet blocking agent in the powder from flowing out to the outside, thereby eliminating the worry of skin irritation caused by the organic ultraviolet blocking agent, and the powder has excellent stability and excellent feel in use. Background Art

[0002] The following description is merely for the purpose of providing background information related to the present invention and does not constitute prior art.

[0003] Generally speaking, about 1% of sunlight reaching the earth's surface is ultraviolet rays that are harmful to the human body.

[0004] Such ultraviolet rays are light with a shorter wavelength than visible light or infrared rays. Since the energy of light is inversely proportional to the wavelength, ultraviolet rays are high-energy light compared to visible light or infrared rays.

[0005] Therefore, the more ultraviolet rays a person is exposed to, the more likely it is that various chemical reactions will occur due to the high energy of ultraviolet rays, inducing physiological changes.

[0006] Due to its high energy, ultraviolet rays can activate various chemical substances, causing their structures to change or even lose their functions.

[0007] In particular, organic pigments, which are widely used in cosmetics and daily necessities, are substances that are activated by ultraviolet rays and easily lose their original functions.

[0008] For this reason, UV blockers have always been indispensable in the formulation of cosmetics and daily necessities.

[0009] In recent years, as the amount of ultraviolet radiation on the earth's surface has increased due to ozone layer depletion, the market for products whose main purpose is to block ultraviolet rays has been growing significantly every year.

[0010] Most chemical (organic) UV blockers may cause physiological and chemical damage when in direct contact with the human body.

[0011] In addition, chemical UV blockers have poor stability to heat and light and poor solubility in solvents, so their usage is limited and the feeling of use is poor.

[0012] In order to overcome such problems, Korean Patent Application No. 10-2009-0059107 discloses a composite pigment in which an organic UV blocker is supported on hollow silica. However, there is a problem that when the organic UV blocker supported on silica is applied to cosmetics, it will dissolve from the silica and come into direct contact with the skin, thereby reducing skin stability, and reducing light stability and thermal stability.

[0013] In addition, Korean Patent Publication No. 10-2018-0126270 discloses a silica-based composite powder for ultraviolet blocking, which includes porous silica; an organic ultraviolet blocking agent doped inside the pores of the above-mentioned porous silica; and a coating applied to the outer surface of the above-mentioned porous silica, but the surface strength of the coating is low, the surface coating is easily broken, the possibility of skin irritation is high, and the feeling of use is poor, so it is required to be improved.

[0014] In addition, the Korean patent application No. 10-2020-0174433 of the applicant of the present invention discloses a method for manufacturing a UV blocking powder, which loads a chemical UV blocking agent in a solid state at room temperature into the pores of porous silica, and then applies a silicic acid aqueous solution to the surface of the silica through a wet process. However, it is required to develop an environmentally friendly manufacturing method that can replace the wet process and reduce the environmental pollution inducing factors caused by the wet process. Summary of the invention

[0015] Technical issues

[0016] The technical problem that the present invention aims to achieve is to solve the previous problems, and its purpose is to provide a method for manufacturing ultraviolet blocking powder using a dry process and ultraviolet blocking powder manufactured thereby, wherein, when forming a coating of the powder, since a dry process is used instead of a wet process, a large amount of waste water generated by the wet process is prevented, thereby being environmentally friendly, and the process time can be greatly shortened, and process energy can be saved. The coating efficiency is high and the amount of raw materials used is reduced, thereby significantly improving the production economy. At the same time, the ultraviolet blocking performance is excellent, the density of the coating is increased to prevent the chemical ultraviolet blocker in the powder from flowing out to the outside, so there is no need to worry about skin irritation caused by organic ultraviolet blockers, and the stability is excellent and the feel of use is excellent.

[0017] Solution to the problem

[0018] The present invention provides a method for producing an ultraviolet blocking powder, which comprises:

[0019] S1) a step of making an organic ultraviolet shielding agent which is solid at room temperature supported in the pores of porous silica;

[0020] S2) a step of preparing an aqueous silicic acid solution; and

[0021] S3) A step of dry-coating a silicic acid aqueous solution on the surface of the porous silica having an organic ultraviolet shielding agent supported in the pores to form a silica coating.

[0022] Preferably, in the silicic acid aqueous solution of step S2), the content of silicic acid is 3 to 30% by weight.

[0023] Preferably, in the dry coating of the above step S3), the silicic acid aqueous solution is sprayed to be applied to the surface of the porous silica carrying the organic ultraviolet shielding agent, and then the silicic acid can form a silica coating through a condensation reaction.

[0024] Specifically, the condensation reaction can be carried out at 80 to 120° C. while stirring the porous silica supported with the organic ultraviolet shielding agent and coated with the silicic acid aqueous solution at 100 to 1000 rpm.

[0025] Preferably, the silica coating layer 30 is 5 to 100 parts by weight based on 100 parts by weight of the total of the porous silica 10 and the ultraviolet shielding agent 20 .

[0026] Preferably, after the above step S3), the method may further include a step of drying the ultraviolet shielding powder having a silicon dioxide coating formed on the surface due to silicic acid.

[0027] Preferably, after the above step S3), the method may further include forming an organic coating or an inorganic coating on the outermost surface of the ultraviolet blocking powder having a silicon dioxide coating formed on the surface due to silicic acid.

[0028] In addition, the present invention provides an ultraviolet blocking powder 100, which comprises:

[0029] Porous silica 10 having pores;

[0030] A chemical ultraviolet shielding agent 20 in a solid state at room temperature and supported in the pores of the porous silica; and

[0031] The silica coating layer 30 is formed by dry-coating silicic acid on the surface of porous silica in which the chemical ultraviolet shielding agent is supported in pores.

[0032] Preferably, the ultraviolet blocking powder 100 is characterized in that it is manufactured by the manufacturing method as described above.

[0033] Preferably, the silica coating layer 30 is 5 to 100 parts by weight based on 100 parts by weight of the total of the porous silica 10 and the ultraviolet shielding agent 20 .

[0034] Preferably, the oil absorption of the UV blocking powder 100 is 0.20 to 0.49 mL / g.

[0035] In addition, the present invention provides a cosmetic comprising the ultraviolet shielding powder 100 as described above.

[0036] Effects of the Invention

[0037] According to the present invention, a method for manufacturing an ultraviolet blocking powder using a dry process and an ultraviolet blocking powder manufactured thereby can be provided, wherein, when forming a coating of the powder, since a dry process is used instead of a wet process, a large amount of waste water generated by the wet process is prevented, thereby being environmentally friendly, the process time can be greatly shortened, process energy can be saved, the coating efficiency is high and the amount of raw materials used can be reduced, thereby significantly improving production economy, and at the same time, the ultraviolet blocking performance is excellent, the density of the coating is increased to prevent the chemical ultraviolet blocking agent in the powder from flowing out to the outside, thereby eliminating the worry of skin irritation caused by the organic ultraviolet blocking agent, and the powder has excellent stability and excellent feel in use. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 A schematic diagram of an ultraviolet blocking powder according to an embodiment of the present invention is shown.

[0039] Figure 2 A schematic diagram of an ultraviolet blocking powder according to another embodiment of the present invention is shown.

[0040] Figure 3 A schematic diagram showing a method for manufacturing ultraviolet blocking powder according to an embodiment of the present invention. DETAILED DESCRIPTION

[0041] The embodiments of the present invention are described in detail so that those skilled in the art can easily implement the present invention. However, the present invention can be implemented in various different ways and is not limited to the embodiments described herein.

[0042] Throughout this specification, when it is stated that a certain part “comprises” a certain constituent element, unless there is a particular description to the contrary, it means that other constituent elements may be further included, rather than excluding other constituent elements.

[0043] In order to solve the shortcomings of the previous wet coating method, such as environmental pollution, high energy consumption and long manufacturing time, the present invention studies a method of forming a silica coating on the surface of porous silica carrying an organic UV blocker in the pores by a dry coating method, and confirms that it can use a silicic acid aqueous solution to form the silica coating. In this case, it is possible to produce a large amount of waste water that is prevented from being generated in the wet process and is environmentally friendly, can greatly shorten the process time, can save process energy, has high coating efficiency and reduces the amount of raw materials used, thereby significantly improving production economy. At the same time, it has excellent UV blocking performance, increases the density of the coating to prevent the chemical UV blocker in the powder from flowing out to the outside, so there is no need to worry about skin irritation caused by the organic UV blocker, and has excellent stability and a good feel in use.

[0044] The method for producing the ultraviolet shielding powder of the present invention is characterized by comprising:

[0045] S1) a step of making an organic ultraviolet shielding agent which is solid at room temperature supported in the pores of porous silica;

[0046] S2) a step of preparing an aqueous silicic acid solution; and

[0047] S3) A step of dry-coating a silicic acid aqueous solution on the surface of the porous silica having an organic ultraviolet shielding agent supported in the pores to form a silica coating.

[0048] In the present invention, the method of loading the chemical UV blocker 20 into the pores of the porous silica 10 in the above-mentioned step S1) can be applied by a known method. Specifically, after mixing the chemical UV blocker 20 and the porous silica 10 in a Henschel mixer, the chemical UV blocker 20 is stirred and then cooled at a temperature above the melting point of the chemical UV blocker 20 and below the thermal decomposition temperature, so that the chemical UV blocker 20 can be loaded into the pores of the porous silica 10. More specifically, the chemical UV blocker 20 can be loaded into the pores of the porous silica 10 by maintaining a temperature of about 60 to 100° C. and stirring at 200 to 500 rpm and then cooling.

[0049] The porous silica 10 may have a porosity of 10 to 90%, and the content of the chemical ultraviolet shielding agent 20 carried thereon may be adjusted according to the application of the product.

[0050] The content of the chemical ultraviolet shielding agent 20 supported on the porous silica 10 can be arbitrarily adjusted. Specifically, the content of the chemical ultraviolet shielding agent 20 supported on the porous silica 10 can be 10 to 200 parts by weight based on 100 parts by weight of the porous silica 10 .

[0051] The above-mentioned chemical UV blocker 20 in a solid state at room temperature can use a well-known chemical UV blocker, specifically, it can be one or more selected from the group consisting of butyl methoxydibenzoylmethane, ethylhexyl methoxycinnamate, ethylhexyl silicate, octyldimethylpara-aminobenzoic acid, octyl methoxycinnamate, octyl salicylate, octocrylene, butyl methoxydibenzoylmethane, oxybenzone, octyl triazone, menthyl anthranilate, 3,4-methylbenzylidene camphor and bis-ethylhexyloxyphenol methoxyphenyl triazine.

[0052] The present invention includes the step of preparing a silicic acid aqueous solution in the step S2), and preferably, the silicic acid content of the silicic acid aqueous solution is 3 to 30% by weight. In this case, it is possible to produce a UV blocking powder with high coating efficiency and reduced raw material usage, thereby significantly improving production economy, and having excellent UV blocking performance, increasing the density of the coating layer to prevent the chemical UV blocking agent in the powder from flowing out to the outside, thereby eliminating the worry of skin irritation caused by the organic UV blocking agent, and having excellent stability and excellent feel in use.

[0053] Specifically, the silicic acid aqueous solution can be produced by dissolving TEOS in distilled water at a pH of 2 to 3 while stirring.

[0054] The present invention includes the step S3) of dry-coating a silicic acid aqueous solution on the surface of the porous silica having an organic ultraviolet blocking agent in the pores to form a silica coating.

[0055] Preferably, in the dry coating of the above step S3), the silicic acid aqueous solution is sprayed to be evenly applied to the surface of the porous silica carrying the organic UV blocker, and then the silicic acid can form a silica coating through a condensation reaction.

[0056] Specifically, the condensation reaction can be carried out at 80 to 120°C for 1 to 5 hours while stirring the porous silica loaded with an organic UV blocker and coated with a silicic acid aqueous solution at 100 to 1000 rpm. The stirring can be performed using a Henschel mixer, and the condensation reaction can be carried out while the inside of the mixer is kept in a vacuum. Preferably, the temperature of the condensation reaction is 100 to 120°C. In this case, it is possible to manufacture a UV blocking powder with high coating efficiency and reduced raw material usage, thereby significantly improving production economy, while having excellent UV blocking performance, increasing the density of the coating and preventing the chemical UV blocker inside the powder from flowing out to the outside, so that there is no need to worry about skin irritation caused by the organic UV blocker, and having excellent stability and excellent feel of use.

[0057] The content of the silica coating layer 30 can be adjusted arbitrarily, and is preferably 5 to 100 parts by weight relative to 100 parts by weight of the total of the porous silica 10 and the ultraviolet shielding agent 20 .

[0058] In the present invention, preferably, after the above step S3), a step of drying the ultraviolet shielding powder with a silicon dioxide coating formed on the surface due to silicic acid can be further included. The above drying can be carried out by a common drying method for the separate parts.

[0059] In addition, in the present invention, preferably, after the above-mentioned step S3), it may further include a step of forming an organic coating or an inorganic coating on the outermost surface of the ultraviolet blocking powder having a silicon dioxide coating formed on the surface due to silicic acid.

[0060] In the present invention, the coating material of the organic coating 40 can be specifically selected from the following monohydric alcohols and / or dihydric alcohols, but not limited thereto, the monohydric alcohols include cetyl alcohol, lauryl alcohol, myristyl alcohol, lauryl myristyl alcohol, lauryl cetyl alcohol, caprylic alcohol, capric alcohol, stearyl alcohol, cetyl stearyl alcohol and decyl alcohol, and the dihydric alcohols include hexanediol, propanediol, butanediol, pentandiol and octanediol. Preferably, the organic coating can be a coating using cetyl alcohol. In this case, the stability of the ultraviolet blocking powder in cosmetics can be further improved.

[0061] In addition, the inorganic coating layer 40 may be formed using a silane compound, or may be formed using titanium dioxide or zinc oxide, and the inorganic coating layer 40 may be formed in an amount of 5 to 100 parts by weight relative to 100 parts by weight of the total of the porous silica 10 and the ultraviolet shielding agent 20. In this case, the stability of the cosmetic can be further improved.

[0062] In addition, in the present invention, after the powder is cooled to room temperature, a part of the powder may be agglomerated, and thus the method may further include the step of pulverizing the powder and sieving it with a sieve of 100 to 200 meshes.

[0063] In addition, the present invention provides an ultraviolet blocking powder 100, which comprises:

[0064] Porous silica 10 having pores;

[0065] A chemical ultraviolet shielding agent 20 in a solid state at room temperature and supported in the pores of the porous silica; and

[0066] The silica coating layer 30 is formed by dry-coating silicic acid on the surface of porous silica in which the chemical ultraviolet shielding agent is supported in pores.

[0067] Preferably, the ultraviolet blocking powder 100 can be manufactured by the method for manufacturing the ultraviolet blocking powder 100 as described above.

[0068] Preferably, the silica coating 30 is 5 to 100 parts by weight relative to 100 parts by weight of the total of the porous silica 10 and the ultraviolet blocker 20. In this case, the ultraviolet blocking performance is excellent, the density of the coating is increased to prevent the chemical ultraviolet blocker in the powder from flowing out to the outside, so there is no need to worry about skin irritation caused by the organic ultraviolet blocker, and the stability is excellent and the feeling of use is excellent.

[0069] Preferably, the oil absorption of the UV blocking powder 100 is 0.20 to 0.49 mL / g, more preferably 0.20 to 0.40 mL / g. In this case, when applied to cosmetics, even if the dosage form is changed, the density of the coating layer is increased to prevent the chemical UV blocking agent in the powder from flowing out to the outside, so there is no need to worry about skin irritation caused by the organic UV blocking agent, and the stability and use feeling are excellent.

[0070] In addition, the pore volume of the ultraviolet blocking powder 100 may be 0.05 to 0.015 cm 3 / g, more preferably 0.05 to 0.01 cm 3 In this case, when applied to cosmetics, chemical UV blockers are prevented from flowing out to the outside, so there is no need to worry about skin irritation caused by organic UV blockers, and the stability and feeling of use are excellent.

[0071] The present invention also provides a cosmetic comprising the above-mentioned ultraviolet shielding powder.

[0072] Hereinafter, the present invention will be described in detail by way of examples, which are as follows. However, the following examples are merely illustrative of the present invention, and the present invention is not limited to the following examples.

[0073] Test 1: Comparison of physical properties of ultraviolet shielding powders based on condensation temperature ([Example 1] to [Example 4] and [Comparative Example 1])

[0074] according to Figure 3The ultraviolet shielding powder was manufactured by the manufacturing method of , and the oil absorption and pore volume of the manufactured ultraviolet shielding powder were measured according to the condensation reaction temperature. The results are shown in the following Table 1. Here, the silicic acid aqueous solution was set to 10 wt%.

[0075] [Table 1]

[0076]

[0077] As shown in Table 1 above, the condensation reaction temperature is preferably 80° C. or higher, more preferably 100° C. or higher.

[0078] Test 2: Comparison of physical properties of UV shielding powder after dry coating and wet coating [Example 3] and [Comparative Example 2]

[0079] Using the same silicic acid aqueous solution, a silica coating was formed by dry coating and wet coating, respectively, to produce an ultraviolet blocking powder. The dry coating was performed using the ultraviolet blocking powder produced in Example 3, and the wet coating was performed using the method described in the prior application of the applicant of the present invention, Korean Patent Application No. 10-2020-0174433 to produce an ultraviolet blocking powder (Comparative Example 2). The oil absorption was measured and shown in Table 2 below.

[0080] [Table 2]

[0081]

[0082] As shown in Table 2 above, it can be confirmed that the UV blocking powder manufactured by dry coating of the present invention (Example 3) has a high coating density compared to the UV blocking powder manufactured by a wet process (Comparative Example 2), which prevents the chemical UV blocking agent inside the powder from flowing out to the outside, thereby eliminating the need to worry about skin irritation caused by organic UV blocking agents and having excellent stability.

[0083] The present invention relates to the small and medium enterprise technology innovation development project RS-2023-00277456 (development of high-added cosmetic materials based on stabilization technology of inorganic particles of anti-aging active materials) of the Ministry of SMEs and Startups of Korea.

[0084] The embodiments of the present invention are described in detail above, but the scope of the present invention is not limited thereto, and various modifications and improvements made by those skilled in the art using the basic concept of the present invention defined in the following claims also fall within the scope of the present invention.

Claims

1. A method for producing an ultraviolet blocking powder, comprising: S1) a step of making an organic ultraviolet shielding agent which is solid at room temperature supported in the pores of porous silica; S2) a step of preparing an aqueous silicic acid solution; as well as S3) A step of dry-coating a silicic acid aqueous solution on the surface of the porous silica having the organic ultraviolet shielding agent supported in the pores to form a silica coating.

2. The method for producing ultraviolet blocking powder according to claim 1, characterized in that: The content of silicic acid in the silicic acid aqueous solution in step S2) is 3 to 30% by weight.

3. The method for producing ultraviolet blocking powder according to claim 1, characterized in that: In the dry coating of the step S3), an aqueous silicic acid solution is sprayed to be applied to the surface of the porous silica carrying the organic ultraviolet shielding agent, and then the silicic acid forms a silica coating through a condensation reaction.

4. The method for producing ultraviolet blocking powder according to claim 3, characterized in that: The condensation reaction is carried out at 80 to 120° C. while stirring the porous silica supported with the organic ultraviolet shielding agent and coated with the silicic acid aqueous solution at 100 to 1000 rpm.

5. The method for producing the ultraviolet blocking powder according to claim 1, further comprising, after the step S3), a step of drying the ultraviolet blocking powder having the silicon dioxide coating formed on the surface by silicic acid.

6. The method for producing an ultraviolet blocking powder according to claim 1, further comprising, after the step S3), a step of forming an organic coating or an inorganic coating on the outermost surface of the ultraviolet blocking powder having a silicon dioxide coating formed on the surface due to silicic acid.

7. A UV blocking powder, comprising: Porous silica with pores; a chemical ultraviolet shielding agent in a solid state at room temperature and supported in the pores of the porous silica; and The silica coating is formed by dry-coating silicic acid on the surface of porous silica in which the chemical ultraviolet shielding agent is supported in pores.

8. The ultraviolet blocking powder according to claim 7, characterized in that: The ultraviolet shielding powder is produced by the production method according to any one of claims 1 to 7.

9. The ultraviolet blocking powder according to claim 7, characterized in that: The silica coating layer (30) is 5 to 100 parts by weight relative to 100 parts by weight of the total of the porous silica (10) and the ultraviolet shielding agent (20).

10. The ultraviolet blocking powder according to claim 7, characterized in that: The oil absorption of the ultraviolet light blocking powder (100) is 0.20 to 0.49 mL / g.

11. A cosmetic comprising the ultraviolet shielding powder according to any one of claims 7 to 10.

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