Two-phase sunscreen composition as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of sunscreen, and particularly relates to a two-phase sunscreen composition as well as a preparation method and application thereof. The invention provides a double-phase sunscreen composition which comprises a water phase and an oil phase, the mass ratio of the water phase is 60%-65%, and the mass ratio of the oil phase is 35%-40%; the oil phase comprises an oil-soluble sun-screening agent and an oil phase solvent; the water phase comprises a water-soluble sun-screening agent, a preservative, a humectant, a thickening agent and water; the mass ratio of the oil-soluble sun-screening agent in the double-phase sun-screening composition is 10%-20%; the mass ratio of the water-soluble sun-screening agent in the double-phase sun-screening composition is 2%-10%. By using a two-phase system, the sunscreen cream can be easily and uniformly pushed on human skin to form a layer of natural film, is natural in appearance and free of false white, is breathable, fresh and cool, does not have an acnes phenomenon, can reduce the burden of the skin, and solves the problem that the existing sunscreen cream is greasy, heavy and airtight.

Description

Technical Field

[0001] The present invention belongs to the technical field of sunscreen, and particularly relates to a biphasic sunscreen composition, a preparation method thereof, and an application thereof. Background Art

[0002] Ultraviolet rays are regarded as the root cause of many skin health problems, especially skin cancer. Fortunately, applying sunscreen as an effective means of protection has begun to be widely used by people.

[0003] Traditional sunscreens are mainly divided into two types: oil-in-water (O / W) and water-in-oil (W / O). However, whether it is an oil-in-water or a water-in-oil system, an inevitably relatively thick protective film will be formed on the face after application, which will affect the skin's breathability and make users feel that the product is not fresh enough, too greasy, and may even cause some skin problems, such as clogged pores. Secondly, the use of these two emulsification systems on the skin is also prone to whitening, resulting in a false whitening phenomenon. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a biphasic sunscreen composition, a preparation method thereof, and an application thereof. The sunscreen composition of the present invention is a biphasic system, which is easy to be evenly spread on the human skin to form a natural film, with a natural appearance and no false whitening, and is breathable, fresh, and will not cause skin problems such as clogged pores.

[0005] The present invention provides a biphasic sunscreen composition, comprising an aqueous phase and an oil phase. The mass ratio of the aqueous phase in the biphasic sunscreen composition is 60% - 65%, and the mass ratio of the oil phase in the biphasic sunscreen composition is 35% - 40%;

[0006] The oil phase comprises an oil-soluble sunscreen and an oil-phase solvent;

[0007] The aqueous phase comprises a water-soluble sunscreen, a preservative, a humectant, a thickener, and water;

[0008] The mass ratio of the oil-soluble sunscreen in the biphasic sunscreen composition is 10% - 20%;

[0009] The mass ratio of the water-soluble sunscreen in the biphasic sunscreen composition is 2% - 10%.

[0010] Preferably, the oil-phase solvent comprises dicaprylyl carbonate, butyl octyl salicylate, diisopropyl sebacate, and dibutyl adipate.

[0011] Preferably, the mass ratio of the oil-phase solvent in the biphasic sunscreen composition is 15% - 25%.

[0012] Preferably, the oil-soluble sunscreen agent includes octyl salicylate, ethylhexyl triazone, diethylhexyl butamido triazone, diethylamino hydroxybenzoyl hexyl benzoate, and bis-ethylhexyloxyphenol methoxyphenyl triazine.

[0013] Preferably, the oil-soluble sunscreen agent further includes isooctyl methoxycinnamate, and the mass ratio of isooctyl methoxycinnamate in the biphasic sunscreen composition is 0% to 10%, and not 0.

[0014] Preferably, the water-soluble sunscreen agent includes phenylbenzimidazole sulfonic acid and terephthalylidene dicamphor sulfonic acid.

[0015] Preferably, the preservative includes PE9010, and the mass ratio of PE9010 in the biphasic sunscreen composition is 0.2% to 1%.

[0016] Preferably, the humectant includes arginine, glycerol, butanediol, and pentanediol; the thickener includes xanthan gum, and the mass ratio of xanthan gum in the biphasic sunscreen composition is 0.05% to 1%.

[0017] The present invention also provides a preparation method of the biphasic sunscreen composition described in the above technical solution, including the following steps:

[0018] First, mix the oil-soluble sunscreen agent and the oil-phase solvent to obtain an oil phase;

[0019] Second, mix the water-soluble sunscreen agent, the preservative, the humectant, the thickener, and water to obtain a water phase;

[0020] Third, mix the oil phase and the water phase to obtain a biphasic sunscreen composition.

[0021] The present invention also provides the application of the biphasic sunscreen composition described in the above technical solution or the biphasic sunscreen composition obtained by the above preparation method in sunscreen products.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] The present invention provides a biphasic sunscreen composition, including a water phase and an oil phase. The mass ratio of the water phase is 60% to 65%, and the mass ratio of the oil phase is 35% to 40%; the oil phase includes an oil-soluble sunscreen agent and an oil-phase solvent; the water phase includes a water-soluble sunscreen agent, a preservative, a humectant, a thickener, and water; the mass ratio of the oil-soluble sunscreen agent in the biphasic sunscreen composition is 10% to 20%; the mass ratio of the water-soluble sunscreen agent in the biphasic sunscreen composition is 2% to 10%.

[0024] The present invention innovatively prepares a biphasic sunscreen composition. Using a biphasic system, the water and oil phases separate when standing still and need to be shaken well before use. It is easier to spread evenly on the human skin to form a natural film, with a natural appearance and no fake whitening. Moreover, it has a fresh texture, is breathable, and will not cause clogged pores, which can reduce the skin burden and solve the problem of the existing sunscreen being greasy, heavy, and non-breathable.

[0025] Using emulsifiers in cosmetics may bring a series of negative effects. For example, they may become allergens and cause irritation to the human body, damage the skin barrier, affect the product stability (such as layering and demulsification), make the product sticky, prone to pilling, may have potential toxicity to the human body, and may have adverse effects on the environment, etc. The biphasic system of the present invention does not use emulsifiers. The design of removing emulsifiers makes the biphasic system smoother to use and has no pilling phenomenon, solving the problem of the existing sunscreen being prone to pilling. The biphasic system of the present invention is friendly to base makeup or other cosmetics, can also reduce the allergic risk of the human body, and reduce the environmental burden. At the same time, the biphasic system of the present invention can avoid the stability problems brought by emulsifiers, contribute to the persistence and effectiveness of the sunscreen effect, and take into account the use experience while providing sun protection. The present invention adds ultraviolet filters (sunscreen agents) in both the water phase and the oil phase system, which can effectively avoid the windowing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0027] Figure 1 It is a product form photo of the biphasic sunscreen cosmetic composition obtained in Example 1. DETAILED DESCRIPTION OF THE INVENTION

[0028] The present invention provides a biphasic sunscreen composition, which includes a water phase and an oil phase. The mass ratio of the water phase in the biphasic sunscreen composition is 60% - 65%, and the mass ratio of the oil phase in the biphasic sunscreen composition is 35% - 40%;

[0029] The oil phase includes oil-soluble sunscreen agents and an oil-phase solvent;

[0030] The water phase includes water-soluble sunscreen agents, preservatives, humectants, thickeners, and water;

[0031] The mass ratio of the oil-soluble sunscreen agent in the biphasic sunscreen composition is 10% - 20%;

[0032] The mass ratio of the water-soluble sunscreen agent in the biphasic sunscreen composition is 2% - 10%.

[0033] In the present invention, unless otherwise specified, the materials and equipment used are commercially available products in the art.

[0034] In the present invention, the oil-phase solvent preferably includes dioctyl carbonate, butyl octyl salicylate, diisopropyl sebacate, and dibutyl adipate. The mass percentage of the oil-phase solvent in the biphasic sunscreen composition is preferably 15% - 25%, more preferably 19% - 24%.

[0035] In the present invention, the oil-soluble sunscreen preferably includes octyl salicylate, ethylhexyl triazone, diethylhexyl butamido triazone, diethylamino hydroxybenzoyl hexyl benzoate, and bis-ethylhexyloxyphenol methoxyphenyl triazine. The oil-soluble sunscreen preferably further includes isooctyl methoxycinnamate. The mass percentage of the oil-soluble sunscreen in the biphasic sunscreen composition is preferably 14.5% - 19.5%.

[0036] In the present invention, the mass percentage of dioctyl carbonate in the biphasic sunscreen composition is preferably 1% - 12%, more preferably 6% - 8%. Dioctyl carbonate is a good solvent with good emollient properties, which can reduce the greasiness and increase the stability of the product.

[0037] In the present invention, the mass percentage of octyl salicylate (OS) in the biphasic sunscreen composition is preferably 1% - 5%. Octyl salicylate is a UVB ultraviolet absorber, which can reduce skin problems caused by ultraviolet rays such as sunburn, sunburn, and aging.

[0038] In the present invention, the mass percentage of butyl octyl salicylate in the biphasic sunscreen composition is preferably 1% - 10%, more preferably 2% - 3%. Butyl octyl salicylate is a good solvent with good emollient properties, which can reduce the greasiness. At the same time, it has a certain ultraviolet absorption efficiency. Although it is not in the list of permitted sunscreen agents for cosmetics, it can absorb ultraviolet rays and provide ultraviolet protection.

[0039] In the present invention, the mass percentage of diisopropyl sebacate in the biphasic sunscreen composition is preferably 1% - 8%, more preferably 5% - 6%. Diisopropyl sebacate can dissolve various components, can form a thin film on the skin surface to reduce water evaporation and play a moisturizing role, and has excellent lubricity and spreadability, which can greatly improve the texture and usability of the product.

[0040] In the present invention, the mass ratio of dibutyl adipate in the biphasic sunscreen composition is preferably 1% - 10%, more preferably 6% - 8%. The dibutyl adipate helps dissolve oil-soluble components, ensures the uniform distribution of the sunscreen agent to achieve a stable sunscreen effect, can promote the dispersion of insoluble components, prevent particle aggregation, and can improve the usability of the product.

[0041] In the present invention, the mass ratio of isooctyl methoxycinnamate (OMC) in the biphasic sunscreen composition is preferably 0% - 10%, more preferably 7%. Isooctyl methoxycinnamate is an excellent ultraviolet absorber, providing effective UVB protection, with good stability and not easily absorbed by the skin. It can enhance the overall sunscreen effect through synergistic action with other sunscreen agents. When OMC is used in combination with DHHB and BEMT, a relatively high SPF value can be achieved.

[0042] In the present invention, the mass ratio of ethylhexyl triazone (EHT) in the biphasic sunscreen composition is preferably 1% - 5%, more preferably 1% - 1.5%. Ethylhexyl triazone is an environmentally friendly oil-soluble UVB absorber, with strong light stability and water resistance, can quickly dissolve in the oil phase, and has excellent compatibility with other components.

[0043] In the present invention, the mass ratio of diethylhexyl butamido triazone (HEB) in the biphasic sunscreen composition is preferably 1% - 10%, more preferably 3% - 4%. Diethylhexyl butamido triazone is a UVB absorber, with extremely strong absorption ability for UVB and excellent light stability and oil solubility. It can effectively increase the SPF value when combined with other ultraviolet absorbers.

[0044] In the present invention, the mass ratio of diethylamino hydroxybenzoyl benzoate (DHHB) in the biphasic sunscreen composition is preferably 1% - 3%, more preferably 2%. Diethylamino hydroxybenzoyl benzoate is a highly efficient UVA absorber, especially having an excellent protective effect on free radicals generated after ultraviolet irradiation, with excellent anti-aging ability. It can achieve full-spectrum protection against ultraviolet rays when used in combination with UVB absorbers.

[0045] In the present invention, the mass ratio of bis-ethylhexyloxyphenol methoxyphenyl triazine (BEMT) in the biphasic sunscreen composition is preferably 1% - 10%, more preferably 1.5% - 2%. Bis-ethylhexyloxyphenol methoxyphenyl triazine is a highly efficient spectral ultraviolet absorber, which can cover both UVA and UVB bands, with extremely high light stability, and can stabilize other photo-unstable ultraviolet absorbers.

[0046] In the present invention, based on the mass percentage in the two-phase sunscreen composition, the oil phase preferably comprises: dicaprylyl carbonate 1% - 12%, butyl octyl salicylate 1% - 10%, diisopropyl sebacate 1% - 8%, dibutyl adipate 1% - 10%, octyl salicylate 1% - 5%, isooctyl methoxycinnamate 1% - 10%, ethylhexyl triazone 1% - 5%, diethylhexyl butamido triazone 1% - 10%, diethylamino hydroxybenzoyl hexyl benzoate 1% - 3%, and bis-ethylhexyloxyphenol methoxyphenyl triazine 1% - 10%.

[0047] In the present invention, the water-soluble sunscreen preferably comprises phenylbenzimidazole sulfonic acid and terephthalylidene dicamphor sulfonic acid;

[0048] The preservative preferably comprises PE9010;

[0049] The humectant preferably comprises arginine, glycerol, butanediol, and pentanediol;

[0050] The thickener preferably comprises xanthan gum.

[0051] In the present invention, the mass percentage of the water-soluble sunscreen in the two-phase sunscreen composition is preferably 4.5% - 5.4%; the total mass percentage of the preservative, humectant, and thickener in the two-phase sunscreen composition is preferably 5% - 15%, more preferably 11.8% - 12.3%.

[0052] In the present invention, the mass percentage of the PE9010 in the two-phase sunscreen composition is preferably 0.2% - 1%, more preferably 0.5%. The PE9010 is a liquid preservative compounded by phenoxyethanol and ethylhexylglycerin, which can effectively inhibit the growth of harmful microorganisms and extend the shelf life of the product.

[0053] In the present invention, the mass percentage of the phenylbenzimidazole sulfonic acid (PBSA) in the two-phase sunscreen composition is preferably 1% - 5%, more preferably 1.5% - 1.8%. The phenylbenzimidazole sulfonic acid is a water-soluble UVA absorber with good light stability, which can greatly improve the SPF value and is safe and non-toxic.

[0054] In the present invention, the mass percentage of the terephthalylidene dicamphor sulfonic acid (TDSA) in the two-phase sunscreen composition is preferably 1% - 8%, more preferably 3% - 3.6%. The terephthalylidene dicamphor sulfonic acid is a water-soluble full-spectrum ultraviolet absorber with stronger UVA band protection ability, low skin absorption rate, which can effectively improve the skin feel and enhance the SPF value.

[0055] In the present invention, the mass ratio of arginine in the two-phase sunscreen composition is preferably 1% - 5%, more preferably 2.6% - 3.6%. Arginine is a natural moisturizing factor that increases skin hydration. Moreover, arginine also has a certain buffering capacity, which can help regulate the pH value of the composition and maintain the balance of the skin surface microbial community.

[0056] In the present invention, the mass ratio of glycerol in the two-phase sunscreen composition is preferably 0.5% - 8%, more preferably 2%. Glycerol can regulate the viscosity and consistency of the composition, improve the skin feel. Moreover, glycerol also has extremely strong water-locking ability, which can keep the skin elastic while moisturizing.

[0057] In the present invention, the mass ratio of butanediol in the two-phase sunscreen composition is preferably 0.5% - 10%, more preferably 5% - 6%, specifically it can be 5%, 5.5% or 6%. Butanediol has multiple functions in the composition, including mild soothing, improving the skin barrier, regulating the water balance, and moisturizing and nourishing. Butanediol can also improve the sticky feeling and reduce the skin burden.

[0058] In the present invention, the mass ratio of xanthan gum in the two-phase sunscreen composition is preferably 0.05% - 1%, more preferably 0.1% - 0.5%, specifically it can be 0.2%. As a thickener, xanthan gum can effectively prevent the composition from being too thin, increase the viscosity of the product, maintain the stability of the system, and can synergistically act with other moisturizing components to increase the skin water content and keep the skin moist.

[0059] In the present invention, the mass ratio of pentanediol in the two-phase sunscreen composition is preferably 0.1% - 2%, more preferably 0.5%. Pentanediol used in the composition can help the dissolution and uniform dispersion of other active ingredients. Synergistically acting with other moisturizing components can enhance the moisturizing performance of the product, and synergistically acting with other preservative components can also extend the shelf life of the product.

[0060] In the present invention, the mass ratio of the total amount of sunscreen agents in the two-phase sunscreen composition is preferably 19.9% - 24%. The total amount of sunscreen agents includes oil-soluble sunscreen agents and water-soluble sunscreen agents.

[0061] In the present invention, calculated by mass ratio in the two-phase sunscreen composition, the aqueous phase preferably includes: phenylbenzimidazole sulfonic acid 1% - 5%, arginine 1% - 5%, water 40% - 50%, terephthalylidene dicamphor sulfonic acid 1% - 8%, glycerol 0.5% - 8%, butanediol 0.5% - 10%, xanthan gum 0.05% - 1%, pentanediol 0.1% - 2% and PE9010 0.2% - 1%.

[0062] In the present invention, based on the mass percentage in the biphasic sunscreen composition, the oil phase of the biphasic sunscreen composition preferably comprises: dicaprylyl carbonate 6%, butyl octyl salicylate 2%, diisopropyl sebacate 5%, dibutyl adipate 6%, octyl salicylate 5%, isooctyl methoxycinnamate 7%, ethylhexyl triazone 1%, diethylhexyl butamido triazone 3%, hexyl diethylaminohydroxybenzoyl benzoate 2%, and bis-ethylhexyloxyphenol methoxyphenyl triazine 1.5%;

[0063] The aqueous phase preferably comprises: phenylbenzimidazole sulfonic acid 1.5%, arginine 2.6%, water 45.2%, terephthalylidene dicamphor sulfonic acid 3%, glycerol 2%, butylene glycol 6%, xanthan gum 0.2%, pentylene glycol 0.5%, and PE9010 0.5%.

[0064] The biphasic sunscreen composition of the present invention separates into oil and water phases when standing still. The biphasic sunscreen composition of the present invention does not contain an emulsifier, solves the problem of easy mud formation caused by emulsifiers, and is smooth to use and can be used in combination with other cosmetics. For sunscreen products containing emulsifiers, demulsification may occur due to improper storage, affecting the uniformity of the product. The biphasic sunscreen composition of the present invention does not contain an emulsifier, and the sunscreen effect is long-lasting and effective.

[0065] The present invention also provides a preparation method of the biphasic sunscreen composition described in the above technical solution, comprising the following steps:

[0066] First mix the oil-soluble sunscreen agent and the oil-phase solvent to obtain an oil phase;

[0067] Second mix the water-soluble sunscreen agent, preservative, humectant, thickener, and water to obtain an aqueous phase;

[0068] Third mix the oil phase and the aqueous phase to obtain a biphasic sunscreen composition.

[0069] In the present invention, the oil-soluble sunscreen agent and the oil-phase solvent are first mixed to obtain an oil phase.

[0070] In the present invention, the temperature of the first mixing is preferably 70-80°C, the first mixing is preferably carried out under stirring, the stirring speed is preferably 100-200 r / min, and the time is preferably 10-20 min. After the first mixing, cooling is preferably further included, and the cooling is preferably carried out under low-speed stirring, and the low-speed stirring speed is preferably 50-100 r / min.

[0071] After obtaining the oil phase, the present invention second mixes the water-soluble sunscreen agent, preservative, humectant, thickener, and water to obtain an aqueous phase.

[0072] Preferably, in the present invention, a water-soluble sunscreen agent, a part of the humectant and water are first mixed fourthly to obtain a first aqueous phase, then the remaining humectant, thickener and preservative are mixed fifthly to obtain a second aqueous phase, and then the first aqueous phase and the second aqueous phase are mixed sixthly to obtain an aqueous phase;

[0073] The temperature of the fourth mixing is preferably 50-60°C. The fourth mixing is preferably carried out under stirring, the rotation speed of the stirring is preferably 400-600 r / min, and the time is preferably 5-10 min;

[0074] The fifth mixing is preferably carried out under stirring, the rotation speed of the stirring is preferably 400-600 r / min, and more preferably 500 r / min;

[0075] The sixth mixing is preferably carried out under stirring, the rotation speed of the stirring is preferably 300-400 r / min; after the stirring, it preferably further includes standing, and the standing time is preferably 5-10 min.

[0076] After obtaining the oil phase and the aqueous phase, in the present invention, the oil phase and the aqueous phase are mixed thirdly to obtain a two-phase sunscreen composition.

[0077] In the present invention, the third mixing is preferably to add the oil phase to the aqueous phase and then stand without stirring.

[0078] The present invention also provides the application of the two-phase sunscreen composition described in the above technical solution or the two-phase sunscreen composition obtained by the above preparation method in sunscreen products.

[0079] The two-phase sunscreen composition described in the present invention can be directly used as a cosmetic.

[0080] The two-phase sunscreen composition of the present invention has both sunscreen and moisturizing effects. While maintaining the skin's water-oil balance, it can also provide broad-spectrum ultraviolet protection to prevent skin aging, delay aging from a deep level, and the addition of oils and alcohols can greatly improve the skin feel. Secondly, the design without emulsifiers can prevent the phenomenon of pilling and caking, avoid the accumulation of emulsifiers on the skin surface, the texture is more refreshing, and the formula is simpler. At the same time, ultraviolet absorbers are added to both the aqueous phase and the oil phase, which can provide more uniform protection after mixing and prevent the occurrence of the windowing effect. The two-phase sunscreen composition of the present invention has simple ingredients, convenient process, and stable ingredients, and has extremely strong guiding significance for the development of new sunscreen compositions.

[0081] In order to further illustrate the present invention, the two-phase sunscreen composition provided by the present invention, its preparation method and application will be described in detail below with reference to the drawings and examples, but they cannot be understood as limiting the protection scope of the present invention.

[0082] Example 1

[0083] Prepare a biphasic sunscreen cosmetic composition without emulsifier according to the group allocation ratio in Table 1:

[0084] Table 1 Group allocation ratios of Examples 1-2 and Comparative Examples 1-2

[0085]

[0086]

[0087] Note: The numbers in the table are all mass percentages, %. Among them, C14-22 alcohol / C12-20 alkyl glucoside is a mixture with the trade name Montanov L; the trade name of glyceryl stearate / PEG-100 stearate is emulsifier A165.

[0088] The preparation method includes the following steps:

[0089] Step 1: Heat the A-phase - oil phase (dioctyl carbonate, octyl salicylate, butyloctyl salicylate, diisopropyl sebacate, dibutyl adipate, isooctyl methoxycinnamate, ethylhexyl triazone, diethylhexyl butamido triazone, diethylamino hydroxybenzoyl benzoic acid hexyl ester, bis-ethylhexyloxyphenol methoxyphenyl triazine) to 70 °C while stirring (100 r / min). After it is dissolved and clear, stir at a low speed (50 r / min) to dissipate heat.

[0090] Step 2: Heat the B1-phase (phenylbenzimidazole sulfonic acid, arginine, water) to 50 °C and stir at a high speed until it is dissolved and clear. Add the B2-phase (p-phenylenedimethylene dicamphorsulfonic acid) to the B1-phase and continue to stir until it is dissolved and clear to obtain the B1 and B2 mixed phase.

[0091] Step 3: Stir the B3-phase (glycerol, butanediol, xanthan gum, pentanediol) at a high speed (500 r / min) until it is uniform.

[0092] Step 4: Add the B1 and B2 mixed phase to the B3-phase, add the B4-phase (PE9010), and continue to stir until it is uniform to obtain the B-phase - water phase.

[0093] Step 5: Add the oil phase to the water phase without stirring to obtain an oil-water stratified system (biphasic sunscreen cosmetic composition).

[0094] The product form finally obtained in Example 1 is as Figure 1 shown, where the left figure is after mixing and the right figure is before mixing. Consumers need to shake well before use to ensure that both the oil phase and the aqueous solution can be evenly covered on the skin. If left standing unused, the oil and water will separate, with the upper layer being the oil phase and the lower layer being the water phase.

[0095] Example 2

[0096] Prepare a biphasic sunscreen cosmetic composition without emulsifier according to the group allocation ratio in Table 1:

[0097] The preparation method is only different from that of Example 1 in that isooctyl methoxycinnamate is not added to Phase A, and the remaining steps are the same.

[0098] Detect the sunscreen effect, use feeling and stability of the biphasic sunscreen systems prepared in Example 1 and Example 2:

[0099] 1) Detection of sun protection index (SPF value) and long-wave ultraviolet protection index (PFA value):

[0100] Testing instrument: LABSPHERE UV TRANSMITTANCE ANALYZER - UV 2000

[0101] Testing method: COLIPA2011

[0102] 2) Use feeling:

[0103] Evaluate the degree of freshness and non-greasiness. Through actual use tests by 50 test subjects who specifically judge the use feeling of skin care products, evaluate the degree of freshness and non-greasiness;

[0104] Evaluation criteria:

[0105] A: More than 40 (including 40) people did not feel greasy;

[0106] B: More than 20 (including 20) and less than 40 people did not feel greasy;

[0107] C: More than 10 (including 10) and less than 20 people did not feel greasy;

[0108] D: Less than 10 people did not feel greasy.

[0109] 3) Stability:

[0110] Respectively take 20 g of the sample, divide it into 3 batches of aqueous phase, oil phase and mixed phase and store them at normal temperature, 5 °C and -18 °C. Observe whether the sample precipitates every week, continuously observe for 30 days and test the sun protection index of the mixed phase after 30 days.

[0111] Evaluation criteria:

[0112] A: No precipitation;

[0113] B: Trace precipitation;

[0114] C: Massive precipitation.

[0115] The results are shown in Table 2:

[0116] Table 2 Test Results of Sunscreen Effect, Usage Experience and Stability of the Biphasic Sunscreen Cosmetic Systems without Emulsifier in Examples 1 and 2

[0117]

[0118] As can be seen from Table 2, the usage experiences of the sunscreens in Examples 1 and 2 are excellent, and the sunscreen effects and stabilities of this biphasic sunscreen cosmetic system are also very good, and it can remain stable without precipitation even under long-term storage.

[0119] Comparative Examples 1 - 2

[0120] Prepare a biphasic sunscreen cosmetic according to the component ratios in Table 1.

[0121] The difference in the preparation methods between Comparative Example 1 and Example 1 is only that C14 - 22 alcohol / C12 - 20 alkyl glucoside and glyceryl stearate / PEG - 100 stearate are added to Phase A.

[0122] The difference in the preparation methods between Comparative Example 2 and Example 2 is only that C14 - 22 alcohol / C12 - 20 alkyl glucoside and glyceryl stearate / PEG - 100 stearate are added to Phase A.

[0123] The centrifugation experiment, heat resistance and cold resistance experiments are carried out according to the experimental methods of GB / T 29665 - 2013. According to the experimental results, the sunscreen systems of Comparative Example 1 and Comparative Example 2 show delamination phenomena in the centrifugation, heat resistance and cold resistance experiments, not meeting the national standard. Moreover, Examples 1 and 2 do not belong to the emollient lotion system, and the systems of Examples 1 and 2 are more refreshing in texture compared with the systems of Comparative Examples 1 and 2 with added emulsifier.

[0124] Place the samples of Examples 1 - 2 and Comparative Examples 1 - 2 in an oven at 48 °C, and detect the SPF and PFA values on the 0th day, 30th day, 45th day, 60th day, 75th day and 90th day respectively. The results are shown in Table 3.

[0125] Detection of Sunscreen Index (SPF value) and Long - wave Ultraviolet Protection Index (PFA value):

[0126] Testing Instrument: LABSPHERE UV TRANSMITTANCE ANALYZER - UV 2000

[0127] Testing Method: COLIPA2011

[0128] Table 3 SPF and PFA Values of Samples of Examples 1 - 2 and Comparative Examples 1 - 2

[0129]

[0130] Comparative Examples 3 - 4

[0131] Prepare a two - phase sunscreen cosmetic according to the component ratios in Table 4.

[0132] Table 4 Component ratios of Example 1 and Comparative Examples 3 - 4

[0133]

[0134]

[0135] Note: The numbers in the table are all mass percentages, %.

[0136] In Table 4, the sun protection factor (SPF value) and the long - wave ultraviolet protection index (PFA value) are detected by the human testing method:

[0137] Testing instrument: Solar Light TM Solar simulator

[0138] Testing method: Human testing method, "Technical Specifications for Cosmetics Safety" (2015 Edition)

[0139] The two - phase sunscreen cosmetic composition of Example 1 contains sunscreen agents in both the aqueous phase and the oil phase. The SPF value measured by human testing reaches 56.3, and the PFA value reaches 13.5. In Comparative Example 3, the sunscreen agent in the aqueous phase is omitted, and only the sunscreen agent in the oil phase is retained, resulting in a significantly reduced sun protection effect, with an SPF of 36.5 and a PFA of 7.6. In Comparative Example 4, the sunscreen agent in the oil phase is omitted, and only the sunscreen agent in the aqueous phase is retained, with an SPF of 7.8 and a PFA of 5.1. The sum of the SPF values of Comparative Example 3 and Comparative Example 4 is 44.3, which is significantly less than the SPF value of 56.3 in Example 1. The sum of the PFA values of Comparative Example 3 and Comparative Example 4 is 12.7, which is significantly less than the PFA value of 13.5 in Example 1. It can be seen that adding sunscreen agents simultaneously in the aqueous phase and the oil phase in the present invention has a synergistic effect in human testing.

[0140] Although the above - mentioned embodiments have described the present invention in detail, they are only a part of the embodiments of the present invention, not all of them. People can also obtain other embodiments according to the embodiments of the present invention without creative labor, and these embodiments all fall within the protection scope of the present invention.

Claims

1. A dual-phase sunscreen composition, characterized in that: It comprises a water phase and an oil phase, wherein the water phase accounts for 60% to 65% by weight of the dual-phase sunscreen composition, and the oil phase accounts for 35% to 40% by weight of the dual-phase sunscreen composition; The oil phase includes an oil-soluble sunscreen agent and an oil phase solvent; The aqueous phase includes a water-soluble sunscreen, a preservative, a moisturizer, a thickener and water; The mass proportion of the oil-soluble sunscreen agent in the dual-phase sunscreen composition is 10% to 20%; The mass proportion of the water-soluble sunscreen agent in the dual-phase sunscreen composition is 2% to 10%.

2. The dual-phase sunscreen composition according to claim 1, characterized in that: The oil phase solvent includes dicaprylyl carbonate, butyl octanol salicylate, diisopropyl sebacate and dibutyl adipate.

3. The dual-phase sunscreen composition according to claim 1 or 2, characterized in that: The mass proportion of the oil phase solvent in the dual-phase sunscreen composition is 15% to 25%.

4. The dual-phase sunscreen composition according to claim 1, characterized in that: The oil-soluble sunscreens include octyl salicylate, ethylhexyl triazone, diethylhexyl butyramido triazone, diethylamino hydroxybenzoyl hexyl benzoate and bis-ethylhexyloxyphenol methoxyphenyl triazine.

5. The dual-phase sunscreen composition according to claim 4, characterized in that: The oil-soluble sunscreen agent also includes isooctyl p-methoxycinnamate, and the mass proportion of isooctyl p-methoxycinnamate in the dual-phase sunscreen composition is 0% to 10%, and is not 0.

6. The dual-phase sunscreen composition according to claim 1, characterized in that: The water-soluble sunscreens include phenylbenzimidazole sulfonic acid and terephthalylidene dicamphor sulfonic acid.

7. The dual-phase sunscreen composition according to claim 1, characterized in that: The preservative includes PE9010, and the mass proportion of PE9010 in the dual-phase sunscreen composition is 0.2% to 1%.

8. The dual-phase sunscreen composition according to claim 1, characterized in that: The moisturizer includes arginine, glycerol, butylene glycol and pentylene glycol; the thickener includes xanthan gum, and the mass proportion of the xanthan gum in the dual-phase sunscreen composition is 0.05% to 1%.

9. The method for preparing the dual-phase sunscreen composition according to any one of claims 1 to 8, characterized in that: The following steps are involved: first mixing the oil-soluble sunscreen agent and the oil phase solvent to obtain an oil phase; secondly mixing the water-soluble sunscreen, preservative, moisturizer, thickener and water to obtain an aqueous phase; The oil phase and the water phase are mixed for a third time to obtain a dual-phase sunscreen composition.

10. Use of the dual-phase sunscreen composition according to any one of claims 1 to 8 or the dual-phase sunscreen composition obtained by the preparation method according to claim 9 in sunscreen products.

Images