Oil-in-water gel bead sunscreen emulsion and preparation method thereof

Abstract

The invention relates to the technical field of sunscreen cosmetics, in particular to an oil-in-water gel bead sunscreen emulsion and a preparation method thereof. The oil-in-water gel bead sunscreen emulsion comprises gel beads and a dispersion liquid, the oil-in-water gel bead sunscreen emulsion comprises, by mass, 60-80 parts of oil gel and 20-40 parts of an oil-soluble sunscreen agent, and the mass part of the dispersion liquid is 2-20 times that of the gel beads; the oil gel comprises 3-16 parts of a gelling agent, and the gelling agent comprises 0-4 parts of a hydrogenated castor oil / sebacic acid copolymer, 3-12 parts of a castor oil / isophorone diisocyanate copolymer, 0-3 parts of an additional component and 80-90 parts of grease. According to the oil-in-water gel bead sunscreen emulsion and the preparation method thereof, the oil-in-water gel bead sunscreen emulsion is stable in structure, the oil-soluble sunscreen agent can be well dispersed, meanwhile, the waterproof performance and the skin feeling can be guaranteed, and the sunscreen effect is good. The problems that in the prior art, an oil-in-water product is poor in waterproof performance, and a sun-screening agent is uneven in dispersion in a system, prone to precipitation and the like, so that the product is poor in sun-screening performance are solved.

Description

Technical Field

[0001] The present application relates to the technical field of sunscreen cosmetics, and in particular to an oil-in-water gel bead sunscreen lotion and a preparation method thereof. Background Art

[0002] Sunscreens include physical sunscreens and chemical sunscreens. The main ingredients of physical sunscreens are titanium dioxide and zinc oxide, which work by reflecting and scattering ultraviolet rays. However, they can only be formulated into oily ointments with a thick texture and a greasy feeling when applied. In addition, it is difficult for sunscreen products prepared with physical sunscreens alone to achieve a high level of sun protection factor (SPF). Sunscreen products prepared with chemical sunscreens have a fine texture, are refreshing compared to physical sunscreen products, can effectively absorb ultraviolet rays, and can achieve a high level of sun protection factor (SPF), but have poor photostability and are easily photodegraded under the action of ultraviolet rays, and need to be reapplied at regular intervals.

[0003] At present, the more commonly used are oil-in-water sunscreen systems and water-in-oil systems, but the products of the oil-in-water sunscreen system are relatively sticky and have a poor skin feel; the water-in-oil system can contain both physical sunscreens and chemical sunscreens, which can achieve a relatively refreshing skin feel while ensuring the sunscreen effect, and are more easily accepted by consumers. However, the product structure of the water-in-oil system is usually not stable enough, the sunscreen is easy to precipitate, and there will be stratification and precipitation, and the water resistance is poor, which affects the product's sunscreen ability and usage feel. Summary of the invention

[0004] The present application provides an oil-in-water gel bead sunscreen lotion and a preparation method thereof, which has a relatively stable structure, and the oil-soluble sunscreen agent can be well dispersed, while ensuring waterproof performance and skin feel, so as to solve the problems in the related art that the oil-in-water product has poor waterproof performance and the sunscreen agent is unevenly dispersed in the system and easy to precipitate, resulting in poor sunscreen performance of the product.

[0005] In a first aspect, an oil-in-water gel bead sunscreen lotion is provided, which comprises gel beads and a dispersion:

[0006] The gel beads include 60 to 80 parts of oil gel and 20 to 40 parts of oil-soluble sunscreen in terms of mass fractions, and the mass fraction of the dispersion is 2 to 20 times that of the gel beads;

[0007] The oil gel comprises 3 to 16 parts of a gelling agent, 0 to 3 parts of an added component and 80 to 90 parts of oil, wherein the gelling agent comprises 0 to 4 parts of a hydrogenated castor oil / sebacic acid copolymer and 3 to 12 parts of a castor oil / isophorone diisocyanate copolymer;

[0008] The preparation method of the oil gel comprises:

[0009] Dissolve 3-16 parts of gelling agent and 80-90 parts of fat at 95-140°C, stir and mix evenly;

[0010] Add 0 to 3 parts of an additional ingredient to the mixture of the gelling agent and the oil, stir and mix at 95 to 140° C. for 1 to 2 hours, cool to room temperature, and then place in a refrigerator at 4 to 8° C. for 6 to 12 hours to form an oil gel;

[0011] The added ingredients include one or more of ethyl cellulose, hydrogenated polyisobutylene, hydrogenated (styrene / isoprene) copolymer, hydrogenated (styrene / butadiene) copolymer, and distearyl dimethyl ammonium hectorite;

[0012] Calculated by mass fraction, the dispersion includes 0-10% of water-soluble active ingredients, 0-10% of polyols, 0.1-2% of thickeners and 0.5-2% of preservatives, and the remainder is supplemented by deionized water.

[0013] Preferably, the oil is one or more of caprylic / capric triglyceride, dicaprylyl carbonate, isononyl isononanoate, peony seed oil, squalane, and isopropyl myristate.

[0014] Preferably, the water-soluble active ingredient includes at least one of 3-o-ethyl ascorbic acid, niacinamide, tranexamic acid, ergothioneine, dipotassium glycyrrhizinate, and sodium salicylate.

[0015] Preferably, the thickener comprises one of a carbomer thickener, xanthan gum, and a polyacrylate cross-linked polymer.

[0016] Preferably, when the thickener is a carbomer thickener, the oil-in-water gel bead sunscreen lotion further comprises arginine, and the carbomer thickener comprises carbomer, wherein the mass ratio of carbomer to arginine is 1:1.

[0017] Preferably, the oil-soluble sunscreen includes several of octocrylene, ethylhexyl triazone, ethylhexyl methoxycinnamate, homosalate, bis-ethylhexyloxyphenol methoxyphenyl triazine, diethylamino hydroxybenzoyl hexyl benzoate, and ethylhexyl salicylate.

[0018] In a second aspect, a method for preparing an oil-in-water gel bead sunscreen lotion is provided, comprising the following steps:

[0019] S1, preparing oil gel;

[0020] S2. Prepare a dispersion: Mix 0-10% of a water-soluble active ingredient with 0-10% of a polyol, 0.1-2% of a thickener, and 0.5-2% of a preservative according to mass percentage, make up the remainder with deionized water, and place at room temperature to obtain a dispersion;

[0021] S3, preparing a hot gel liquid: mixing 60-80 parts of the oil gel prepared in S1 with 20-40 parts of an oil-soluble sunscreen at 72-78° C., maintaining the temperature for 30-60 minutes and stirring to obtain a hot gel liquid;

[0022] S4, preparing an oil-in-water gel bead sunscreen lotion: under continuous stirring, adding the hot gel liquid prepared in S3 in liquid form to the dispersion prepared in S2, and continuously stirring for 1 to 6 minutes to obtain an oil-in-water gel bead sunscreen lotion, wherein the stirring rate of the continuous stirring is 100 to 800 r / min.

[0023] The beneficial effects of the technical solution provided by this application include:

[0024] The present application provides an oil-in-water gel bead sunscreen lotion and a preparation method thereof. The prepared oil-in-water gel bead system forms a three-dimensional network structure while encapsulating an oil phase and an oil-soluble sunscreen agent, and has good waterproof performance. The oil-soluble sunscreen agent is evenly dispersed in the three-dimensional network structure, and the stability is improved, thereby improving the sunscreen performance. At the same time, the oil-soluble sunscreen agent is bound in the gel network, which can reduce skin penetration and is evenly dispersed in the gel. At the same time, the system does not contain a surfactant, has high safety, and has strong ion resistance. After application, a waterproof oil film is formed on the skin surface, and the skin feels comfortable and non-greasy. The problem of poor waterproof performance of oil-in-water products and poor sunscreen performance of products caused by uneven dispersion and easy precipitation of sunscreen agents in the system in the related art can be solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 A flow chart of the method for preparing the oil-in-water gel bead sunscreen lotion provided in this application;

[0027] Figure 2 Microscope photos of the oil-in-water gel beads prepared in Examples 4 and 5 provided in this application;

[0028] Figure 3 Microscope photos of the oil-in-water gel beads prepared in Examples 6 and 7 provided in this application;

[0029] Figure 4 Microscope photos of the oil-in-water gel beads prepared in Examples 8 and 9 provided in this application;

[0030] Figure 5Ultraviolet absorption spectra of the samples prepared in Example 4, Comparative Example 1 and Comparative Example 2 provided in this application, wherein the blue one is Example 4, the black one is Comparative Example 1 and the red one is Comparative Example 2;

[0031] Figure 6 The samples prepared in Example 4 and Comparative Example 2 provided in the present application were applied on the inner side of the arm, and the Visia images were taken under ultraviolet light. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0033] See also Figure 1-6 As shown, the present application provides an oil-in-water gel bead sunscreen lotion and a preparation method thereof, which can solve the problems in the related art that the oil-in-water product has poor waterproof performance and the sunscreen agent is unevenly dispersed and easily precipitated in the system, resulting in poor sunscreen performance of the product.

[0034] Specifically, the preparation method of the oil-in-water gel bead sunscreen lotion comprises the following steps:

[0035] S1. Prepare oil gel: dissolve 3-16 parts of gelling agent and 80-90 parts of oil at 95-140°C, stir and mix evenly;

[0036] Add 0 to 3 parts of an additional ingredient to the mixture of the gelling agent and the oil, stir and mix at 95 to 140° C. for 1 to 2 hours, cool to room temperature, and then place in a refrigerator at 4 to 8° C. for 6 to 12 hours to form an oil gel;

[0037] Specifically, the oil gel comprises 3 to 16 parts of a gelling agent, 0 to 3 parts of an additional component and 80 to 90 parts of oil, wherein the gelling agent comprises 0 to 4 parts of a hydrogenated castor oil / sebacic acid copolymer and 3 to 12 parts of a castor oil / isophorone diisocyanate copolymer;

[0038] S2. Prepare a dispersion: Mix 0-10% of a water-soluble active ingredient with 0-10% of a polyol, 0.1-2% of a thickener, and 0.5-2% of a preservative according to mass percentage, make up the remainder with deionized water, and place at room temperature to obtain a dispersion;

[0039] S3, preparing a hot gel liquid: mixing 60-80 parts of the oil gel prepared in S1 with 20-40 parts of an oil-soluble sunscreen at 72-78° C., and keeping the temperature constant for 30-60 minutes to obtain a hot gel liquid;

[0040] S4. Prepare an oil-in-water gel bead sunscreen lotion: add the hot gel liquid prepared in S3 in liquid form to the dispersion prepared in S2 under continuous stirring, and continue stirring for 1 to 6 minutes to obtain an oil-in-water gel bead sunscreen lotion, wherein the mass fraction of the dispersion is 2 to 20 times that of the hot gel liquid, and the stirring rate of the continuous stirring is 100 to 800 r / min.

[0041] It should be noted that, after the hot gel liquid is added to the dispersion liquid and then cooled, gel beads are formed and obtained in the dispersion liquid, so it can be considered that the hot gel liquid and the gel beads are the same substance in different states.

[0042] Specifically, the mass fraction of the added ingredients in S1 does not exceed 3 parts, and the added ingredients include one or more of ethyl cellulose, hydrogenated polyisobutylene, hydrogenated (styrene / isoprene) copolymer, hydrogenated (styrene / butadiene) copolymer, and distearyl dimethyl ammonium hectorite.

[0043] In some embodiments, the oil-soluble sunscreen includes several of octocrylene, ethylhexyl triazone, ethylhexyl methoxycinnamate, homosalate, bis-ethylhexyloxyphenol methoxyphenyl triazine, diethylamino hydroxybenzoyl hexyl benzoate, and ethylhexyl salicylate.

[0044] In some embodiments, the oil is one or more of caprylic / capric triglyceride, dicaprylyl carbonate, isononyl isononanoate, peony seed oil, squalane, and isopropyl myristate.

[0045] In some embodiments, the water-soluble active ingredient includes at least one of 3-o-ethyl ascorbic acid, niacinamide, tranexamic acid, ergothioneine, dipotassium glycyrrhizinate, and sodium salicylate.

[0046] In some embodiments, the thickener includes one of a carbomer thickener, xanthan gum, and a polyacrylate cross-linked polymer.

[0047] Preferably, when the thickener is a carbomer thickener, the oil-in-water gel bead sunscreen lotion further comprises arginine, and the carbomer thickener comprises carbomer, wherein the mass ratio of carbomer to arginine is 1:1.

[0048] In some embodiments, the preservative is one or more of sodium benzoate, benzyl alcohol, salicylic acid, chloranil and hexylene glycol.

[0049] In some embodiments, the polyol is one of glycerol, propylene glycol, and butylene glycol.

[0050] It should be noted that the units of mass parts in the embodiments and comparative examples are not exactly the same. The oil-in-water gel bead sunscreen lotion includes 60 to 80 parts of oil gel, 20 to 40 parts of oil-soluble sunscreen, and 160 to 2400 parts of dispersion. The mass parts of these three parts are consistent. For example, a single mass part can be 1g; while the oil gel includes 3 to 16 parts of gelling agent, 0 to 3 parts of additional ingredients and 80 to 90 parts of oil. The three mass parts here are different from the mass parts in the oil-in-water gel bead sunscreen lotion. For example, when the parts of the oil gel, oil-soluble sunscreen and dispersion are 1g, the parts of the gelling agent, additional ingredients and oil must be less than 1g.

[0051] Example 1

[0052] The method for preparing the oil-in-water gel bead sunscreen lotion provided in this embodiment comprises the following steps:

[0053] S1. Preparation of oil gel: 30 g of castor oil / isophorone diisocyanate copolymer, 400 g of dioctyl carbonate and 400 g of isopropyl myristate were stirred and mixed at 95° C. for 2 h, and then cooled to room temperature, and then placed in a refrigerator and refrigerated at 8° C. for 12 h to form an oil gel;

[0054] S2, preparing a dispersion: mixing 2 g of xanthan gum with 10 g of sodium benzoate, adding 1988 g of deionized water, placing at room temperature, and mixing evenly to obtain a dispersion;

[0055] S3, preparing a hot gel liquid: mixing 600 g of the oil gel prepared in S1 with 200 g of an oil-soluble sunscreen at 72° C., and heating at a constant temperature for 60 min to obtain a hot gel liquid;

[0056] Among them, the oil-soluble sunscreen includes 100g of octocrylene, 50g of ethylhexyl triazone and 50g of homosalate.

[0057] S4, preparing an oil-in-water gel bead sunscreen lotion: under continuous stirring, add 100 g of the hot gel solution prepared in S3 in liquid form to 2000 g of the dispersion prepared in S2, and continue stirring at a speed of 100 r / min for 1 min to obtain an oil-in-water gel bead sunscreen lotion.

[0058] Example 2

[0059] The method for preparing the oil-in-water gel bead sunscreen lotion provided in this embodiment comprises the following steps:

[0060] S1. Preparation of oil gel: 80 g of castor oil / isophorone diisocyanate copolymer and 450 g of isononyl isononanoate were stirred and mixed at 140° C. for 1 h, then cooled to room temperature, and then placed in a refrigerator at 4° C. for 6 h to form an oil gel;

[0061] S2, preparing a dispersion: mixing 2 g of 3-o-ethyl ascorbic acid, 2 g of carbomer, 2 g of arginine, and 4 g of benzyl alcohol, adding 192 g of deionized water, placing at room temperature, and mixing uniformly to obtain a dispersion;

[0062] S3, preparing a hot gel liquid: mixing 400 g of the oil gel prepared in step S1 with 200 g of an oil-soluble sunscreen at 78° C., and heating at a constant temperature for 30 min to obtain a hot gel liquid;

[0063] Among them, the oil-soluble sunscreen includes 100g of octocrylene, 50g of ethylhexyl methoxycinnamate and 50g of bis-ethylhexyloxyphenol methoxyphenyl triazine.

[0064] S4. Prepare an oil-in-water gel bead sunscreen lotion: add 100 g of the hot gel liquid prepared in step S3 in a liquid state to 200 g of the dispersion prepared in step S2 under continuous stirring, and continue stirring at a speed of 400 r / min for 1 min to obtain an oil-in-water gel bead sunscreen lotion.

[0065] Example 3

[0066] The method for preparing the oil-in-water gel bead sunscreen lotion provided in this embodiment comprises the following steps:

[0067] S1. preparing an oil gel: dissolving 20 g of castor oil / isophorone diisocyanate copolymer and 170 g of dioctyl carbonate at 105° C., stirring and mixing to obtain a mixture;

[0068] Then, 2 g of hydrogenated (styrene / isoprene) copolymer was added to the mixture, and the mixture was stirred and mixed at 105° C. for 2 h, and then cooled to room temperature, and then placed in a refrigerator and refrigerated at 6° C. for 10 h to form an oil gel;

[0069] S2. Prepare a dispersion: mix 10 g of glycerin, 3 g of Carbopol 940, 2 g of polyacrylate cross-linked polymer-6 and 5 g of salicylic acid, add 455 g of deionized water, heat until completely dissolved, cool at room temperature, add 25 g of niacinamide, mix well to obtain a dispersion;

[0070] S3, preparing a hot gel liquid: mixing 140 g of the oil gel prepared in S1 with 60 g of an oil-soluble sunscreen at 76° C., and heating at a constant temperature for 45 min to obtain a hot gel liquid;

[0071] Among them, the oil-soluble sunscreen includes 6g of ethylhexyl triazone, 20g of ethylhexyl salicylate, 20g of homosalate and 14g of diethylaminohydroxybenzoyl hexyl benzoate.

[0072] S4, preparing an oil-in-water gel bead sunscreen lotion: under continuous stirring, add 50 g of the hot gel solution prepared in S3 in liquid form to 500 g of the dispersion prepared in S2, and continue stirring at a speed of 800 r / min for 3 min to obtain an oil-in-water gel bead sunscreen lotion.

[0073] Example 4

[0074] The method for preparing the oil-in-water gel bead sunscreen lotion provided in this embodiment comprises the following steps:

[0075] S1. preparing an oil gel: dissolving 8 g of hydrogenated castor oil / sebacic acid copolymer, 32 g of castor oil / isophorone diisocyanate copolymer, 170 g of caprylic acid / capric acid triglyceride, and 170 g of squalane at 100° C., stirring and mixing to obtain a mixture;

[0076] Then, 8 g of hydrogenated (styrene / butadiene) copolymer was added to the mixture, and the mixture was stirred and mixed at 120° C. for 1.5 h, and then cooled to room temperature, and then placed in a refrigerator and refrigerated at 6° C. for 8 h to form an oil gel;

[0077] S2, prepare a dispersion: 40g of dipotassium glycyrrhizinate, 20g of propylene glycol and 2g of carbomer are mixed with 2g of arginine, 2g of cinnamone and 2g of hexylene glycol, and 332g of deionized water are added, placed at room temperature, and mixed uniformly to obtain a dispersion;

[0078] S3, preparing a hot gel liquid: mixing 130 g of the oil gel prepared in S1 with 50 g of an oil-soluble sunscreen at 76° C., and heating at a constant temperature for 45 min to obtain a hot gel liquid;

[0079] Among them, the oil-soluble sunscreen includes 20g of ethylhexyl triazone and 30g of diethylamino hydroxybenzoyl hexyl benzoate.

[0080] S4, preparing an oil-in-water gel bead sunscreen lotion: under continuous stirring, adding 50 g of the hot gel solution prepared in step S3 in liquid form to 400 g of the dispersion prepared in step S2, and continuously stirring at a speed of 250 r / min for 4 min to obtain an oil-in-water gel bead sunscreen lotion.

[0081] Example 5

[0082] The difference between this embodiment and Example 4 is that the stirring speed in step S4 is 300 r / min.

[0083] Example 6

[0084] The method for preparing the oil-in-water gel bead sunscreen lotion provided in this embodiment comprises the following steps:

[0085] S1. preparing an oil gel: dissolving 16 g of hydrogenated castor oil / sebacic acid copolymer, 48 g of castor oil / isophorone diisocyanate copolymer and 340 g of isopropyl myristate at 120° C., stirring and mixing to obtain a mixture;

[0086] Then, 12 g of ethyl cellulose was added to the mixture, and the mixture was stirred and mixed at 105° C. for 1.5 h, and then cooled to room temperature, and then placed in a refrigerator and refrigerated at 6° C. for 8 h to form an oil gel;

[0087] S2, preparing a dispersion: 30 g of tranexamic acid, 60 g of butylene glycol, 3 g of carbomer, and 6 g of hexylene glycol were mixed, and 498 g of deionized water was added, and the mixture was placed at room temperature and mixed uniformly to obtain a dispersion;

[0088] S3, preparing a hot gel liquid: mixing 140 g of the oil gel prepared in S1 with 60 g of an oil-soluble sunscreen at 76° C., and heating at a constant temperature for 45 min to obtain a hot gel liquid;

[0089] The oil-soluble sunscreen includes 20 g of homosalate, 30 g of bis-ethylhexyloxyphenol methoxyphenyl triazine and 10 g of ethylhexyl salicylate.

[0090] S4. Prepare an oil-in-water gel bead sunscreen lotion: add 50 g of the hot gel liquid prepared in step S3 in a liquid state to 600 g of the dispersion prepared in step S2 under continuous stirring, and continue stirring at a speed of 300 r / min for 4 min to obtain an oil-in-water gel bead sunscreen lotion.

[0091] Example 7

[0092] The difference between this embodiment and Example 6 is that in step S2, 3 g of arginine is added.

[0093] Example 8

[0094] The method for preparing the oil-in-water gel bead sunscreen lotion provided in this embodiment comprises the following steps:

[0095] S1. preparing an oil gel: dissolving 10 g of hydrogenated castor oil / sebacic acid copolymer, 15 g of castor oil / isophorone diisocyanate copolymer and 425 g of squalane at 120° C., stirring and mixing to obtain a mixture;

[0096] 5 g of hydrogenated polyisobutylene and 5 g of hydrogenated (styrene / isoprene) were added to the mixture, stirred and mixed at 120° C. for 1.5 h, cooled to room temperature, and then placed in a refrigerator and refrigerated at 6° C. for 8 h to form an oil gel;

[0097] S2, prepare dispersion: 15g of ergothioneine, 5g of nicotinamide, 20g of propylene glycol and 2g of carbomer are mixed with 2g of arginine, 2g of nicotinamide, and 2g of hexylene glycol, and 352g of deionized water is added, placed at room temperature, and a dispersion is obtained after mixing uniformly;

[0098] S3, preparing a hot gel liquid: mixing 140 g of the oil gel prepared in S1 with 60 g of an oil-soluble sunscreen at 76° C., and heating at a constant temperature for 45 min to obtain a hot gel liquid;

[0099] Wherein, the oil-soluble sunscreen includes 20g of bis-ethylhexyloxyphenol methoxyphenyl triazine and 40g of diethylamino hydroxybenzoyl hexyl benzoate.

[0100] S4, preparing an oil-in-water gel bead sunscreen lotion: under continuous stirring, adding 50 g of the hot gel solution obtained in step S3 in liquid form to 400 g of the dispersion obtained in step S2, and continuously stirring at a speed of 350 r / min for 4 min to obtain an oil-in-water gel bead sunscreen lotion.

[0101] Example 9

[0102] The method for preparing the oil-in-water gel bead sunscreen lotion provided in this embodiment comprises the following steps:

[0103] S1. preparing an oil gel: dissolving 10 g of hydrogenated castor oil / sebacic acid copolymer, 25 g of castor oil / isophorone diisocyanate copolymer and 425 g of peony seed oil at 120° C., stirring and mixing to obtain a mixture;

[0104] Then, 10 g of distearyl dimethyl ammonium hectorite was added to the mixture, and the mixture was stirred and mixed at 120° C. for 1.5 h, and then cooled to room temperature, and then placed in a refrigerator and refrigerated at 6° C. for 8 h to form an oil gel;

[0105] S2, preparing a dispersion: mixing 20 g of sodium salicylate, 20 g of butylene glycol and 2 g of carbomer with 2 g of arginine, 2 g of quinone and 2 g of hexylene glycol, adding 352 g of deionized water, placing at room temperature, and mixing evenly to obtain a dispersion;

[0106] S3, preparing a hot gel liquid: mixing 140 g of the oil gel prepared in S1 with 60 g of an oil-soluble sunscreen at 76° C., and heating at a constant temperature for 45 min to obtain a hot gel liquid;

[0107] Wherein, the oil-soluble sunscreen includes 20g of bis-ethylhexyloxyphenol methoxyphenyl triazine and 40g of diethylamino hydroxybenzoyl hexyl benzoate.

[0108] S4, preparing an oil-in-water gel bead sunscreen lotion: under continuous stirring, adding 50 g of the hot gel solution prepared in step S3 in liquid form to 400 g of the dispersion prepared in step S2, and continuously stirring at a speed of 350 r / min for 5 min to obtain an oil-in-water gel bead sunscreen lotion.

[0109] Example 10

[0110] The difference between this embodiment and Example 4 is that the added ingredients are 4 g of hydrogenated (styrene / butadiene) and 4 g of ethyl cellulose.

[0111] Comparative Example 1

[0112] The preparation method of the oil-in-water gel bead sunscreen lotion provided in this comparative example comprises the following steps:

[0113] S1. Prepare an oil phase: dissolve 13 g of hydrogenated castor oil / sebacic acid copolymer, 57 g of caprylic / capric triglyceride, 57 g of squalane, 0.6 g of polyglyceryl-3 methylglucose distearate, and 2.6 g of glyceryl monostearate at 100° C., add 20 g of ethylhexyl triazone and 30 g of diethylamino hydroxybenzoyl hexyl benzoate, stir and mix well to obtain a uniform oil phase;

[0114] S2. Prepare the aqueous phase: dissolve 10 g glycerol, 3 g sodium hyaluronate and 1 g carbomer in 386 g deionized water, and heat the aqueous phase to 75° C.;

[0115] S3, emulsification and mixing: slowly add 50 g of the oil phase at 70° C. into 400 g of the water phase, and emulsify using a high-speed shear emulsifier at a speed of 3000 r / min for 5 min;

[0116] S4, homogenization: the emulsified product obtained in S3 is homogenized twice using a homogenizer to obtain an emulsion, and the homogenization pressure is 18000 psi;

[0117] The emulsion was cooled to 40° C. under stirring, and continued to be stirred for 20 min to obtain an oil-in-water sunscreen emulsion.

[0118] Comparative Example 2

[0119] Dissolve 34 g of caprylic / capric triglyceride, 20 g of squalane, 4 g of hydrogenated lecithin, 6 g of cetearyl alcohol, 10 g of ethylhexyl triazone, and 16 g of diethylamino hydroxybenzoyl hexyl benzoate at 85° C., stir and mix to obtain an oil phase;

[0120] 40 g of dipotassium glycyrrhizinate, 20 g of propylene glycol, and 2 g of carbomer were added to 332 g of deionized water, dissolved at 85° C., and mixed evenly to obtain an aqueous phase;

[0121] The oil phase was added to the water phase and homogenized for 10 minutes to obtain a primary emulsion. The primary emulsion was stirred and cooled to 55°C at room temperature, and 2g of arginine, 2g of quinone and 2g of hexanediol were added, and the mixture was stirred to room temperature to obtain an oil-in-water sunscreen lotion.

[0122] Specifically, in the preparation process of oil-in-water gel bead sunscreen lotion, the stirring speed, stirring time and dispersion viscosity will affect the size of the oil gel beads. Among them, the content and proportion of the gelling agent and the difference in oil in the oil gel will directly affect the mechanical properties of the oil-in-water gel beads. The present application prepares oil-in-water gel beads with different particle sizes, different mechanical properties and different product skin feel, so as to broaden the application field.

[0123] See also Figure 2 As shown, taking Example 4 and Example 5 as examples, for the same formulation, the greater the stirring speed during dispersion, the smaller the oil droplet size.

[0124] See also Figure 3 As shown, taking Example 6 and Example 7 as examples, with the same formula, adding arginine to the dispersion can make it thicker. The greater the viscosity of the dispersion, the smaller the oil droplet size.

[0125] See also Figure 4 As shown, taking Example 8 and Example 9 as examples, the longer the stirring time, the smaller the oil droplet diameter.

[0126] Further, see Figure 5 As shown, Figure 5 The sunscreen performance of Example 4, Comparative Example 1 and Comparative Example 2 is compared. It can be seen that Example 4 has a stronger sunscreen performance, which is specifically reflected in the absorbance. Comparative Example 2 adds more sunscreen, but the sunscreen performance is inferior to the oil-in-water gel bead sunscreen lotion prepared in Example 4.

[0127] See also Figure 6 As shown in the figure, the samples applied on the inner side of the arm from left to right are Example 4, Comparative Example 2 and blank control. The oil-in-water gel beads obtained in Example 4 have better uniformity, are relatively light and thin, and have good waterproof properties. Although Comparative Example 2 adds nearly twice as much sunscreen as Example 4, Figure 5 and Figure 6It can be seen that its sunscreen performance and waterproof performance are both weaker than those of Example 4, that is, the sunscreen performance of the ordinary water-in-oil sunscreen lotion prepared with a high content of sunscreen cannot reach that of the water-in-oil gel bead sunscreen lotion prepared with a low content of sunscreen in Example 4. For users, the oil beads of the water-in-oil gel bead system break during the application process, and the oil gel spreads on the skin to form a film. The film-forming property is derived from the gel's own properties. The oil gel itself is formed by the oil phase gel agents entangled with each other to form a three-dimensional network structure while encapsulating the oil phase. In this system, the oil-soluble sunscreen is evenly dispersed, which can reduce the amount of sunscreen while ensuring strong sunscreen performance. It does not contain surfactants and has high safety.

[0128] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. An oil-in-water gel bead sunscreen lotion, characterized in that: It includes gel beads and dispersion: The gel beads include 60 to 80 parts of oil gel and 20 to 40 parts of oil-soluble sunscreen in terms of mass fractions, and the mass fraction of the dispersion is 2 to 20 times that of the gel beads; The oil gel comprises 3 to 16 parts of a gelling agent, 0 to 3 parts of an added component and 80 to 90 parts of oil, wherein the gelling agent comprises 0 to 4 parts of a hydrogenated castor oil / sebacic acid copolymer and 3 to 12 parts of a castor oil / isophorone diisocyanate copolymer; The preparation method of the oil gel comprises: Dissolve 3-16 parts of gelling agent and 80-90 parts of fat at 95-140°C, stir and mix evenly; Add 0 to 3 parts of an additional ingredient to the mixture of the gelling agent and the oil, stir and mix at 95 to 140° C. for 1 to 2 hours, cool to room temperature, and then place in a refrigerator at 4 to 8° C. for 6 to 12 hours to form an oil gel; The added ingredients include one or more of ethyl cellulose, hydrogenated polyisobutylene, hydrogenated (styrene / isoprene) copolymer, hydrogenated (styrene / butadiene) copolymer, and distearyl dimethyl ammonium hectorite; Calculated by mass fraction, the dispersion includes 0-10% of water-soluble active ingredients, 0-10% of polyols, 0.1-2% of thickeners and 0.5-2% of preservatives, and the remainder is supplemented by deionized water.

2. The oil-in-water gel bead sunscreen lotion according to claim 1, characterized in that: The oil is one or more of caprylic / capric triglyceride, dicaprylyl carbonate, isononyl isononanoate, peony seed oil, squalane, and isopropyl myristate.

3. The oil-in-water gel bead sunscreen lotion according to claim 1, characterized in that: The water-soluble active ingredient includes at least one of 3-o-ethyl ascorbic acid, nicotinamide, tranexamic acid, ergothioneine, dipotassium glycyrrhizinate and sodium salicylate.

4. The oil-in-water gel bead sunscreen lotion according to claim 1, characterized in that: The thickener includes one of a carbomer thickener, xanthan gum, and a polyacrylate cross-linked polymer.

5. The oil-in-water gel bead sunscreen lotion according to claim 4, characterized in that: When the thickener is a carbomer thickener, the oil-in-water gel bead sunscreen lotion further includes arginine, and the carbomer thickener includes carbomer, wherein the mass ratio of carbomer to arginine is 1:

1.

6. The oil-in-water gel bead sunscreen lotion according to claim 1, characterized in that: The oil-soluble sunscreen includes several of octocrylene, ethylhexyl triazone, ethylhexyl methoxycinnamate, homosalate, bis-ethylhexyloxyphenol methoxyphenyl triazine, diethylamino hydroxybenzoyl hexyl benzoate, and ethylhexyl salicylate.

7. A method for preparing the oil-in-water gel bead sunscreen lotion according to any one of claims 1 to 6, characterized in that: It includes the following steps: S1, preparing oil gel; S2. Prepare a dispersion: Mix 0-10% of a water-soluble active ingredient with 0-10% of a polyol, 0.1-2% of a thickener, and 0.5-2% of a preservative according to mass percentage, make up the remainder with deionized water, and place at room temperature to obtain a dispersion; S3, preparing a hot gel liquid: mixing 60-80 parts of the oil gel prepared in S1 with 20-40 parts of an oil-soluble sunscreen at 72-78° C., maintaining the temperature for 30-60 minutes and stirring to obtain a hot gel liquid; S4, preparing an oil-in-water gel bead sunscreen lotion: under continuous stirring, adding the hot gel liquid prepared in S3 in liquid form to the dispersion prepared in S2, and continuously stirring for 1 to 6 minutes to obtain an oil-in-water gel bead sunscreen lotion, wherein the stirring rate of the continuous stirring is 100 to 800 r / min.

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