Low-viscosity water-in-oil sunscreen lotion preparation

Abstract

The invention belongs to the technical field of cosmetics, and discloses a low-viscosity water-in-oil sunscreen lotion preparation which comprises the following components in parts by weight: 2-6 parts of an emulsifier, 0.2-0.5 part of a thickener, 22-40 parts of a sunscreen agent, 30-50 parts of an emollient, 6-15 parts of a humectant, 1-15 parts of an active component, 3 parts of 1, 2-pentanediol, 0.5-1 part of a stabilizer, 4 parts of a skin feeling regulator and the balance of water. The low-viscosity water-in-oil preparation is obtained by controlling the ratio of the oil phase to the water phase and matching the silicone oil, the thickening agent and the specific emulsifier, the viscosity of the sunscreen emulsion preparation is controlled within 3000mPa. S, and the sunscreen emulsion preparation has uniform and fine dispersion particle size, so that the preparation has low viscosity and good stability. The low viscosity can endow the product with good spreadability and smearing performance, the good stability enables the product not to be matched with a specific packaging material to shake for secondary emulsification, and the situation that the sunscreen effect of the smeared product is reduced possibly due to uneven shaking can be avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of cosmetics, and in particular relates to a low-viscosity water-in-oil sunscreen lotion preparation. Background Art

[0002] In daily life, the skin will be overexposed to ultraviolet rays. If no sun protection measures are taken, it will cause certain damage to the skin. Therefore, the development of sunscreen products is a hot topic in cosmetics research and development.

[0003] Common oil-in-water sunscreen products on the market include sunscreen cream, sunscreen lotion, sunscreen spray and shake-to-shake formulations. Sunscreen lotion and sunscreen cream are generally thicker in texture and feel greasy and heavy on the skin. Sunscreen sprays often bring the risk of nasal inhalation during use. Sunscreen sprays and shake-to-shake formulations are prone to stratification, which can easily cause the sunscreen agent to precipitate or agglomerate, affecting the sunscreen effect, and need to be used with specific packaging materials.

[0004] Patent CN102038616B discloses a stable water-in-oil emulsion system. The inventor uses a quaternary ammonium salt cationic surfactant (palmitamidopropyl trimethyl ammonium chloride) to obtain a low-viscosity water-in-oil emulsion. However, ammonium cationic surfactants often give the product an unpleasant ammonia smell and may cause skin irritation, which will give consumers a bad user experience.

[0005] Patent CN107308012A discloses an oil-in-water type sunscreen lotion with low viscosity and good suspension ability. The inventor combines hydrophilic silica with aluminum magnesium silicate or lithium magnesium silicate to obtain a low-viscosity water-in-oil type sunscreen lotion with high suspension ability, low viscosity and good spreadability. However, the low-density hydrophilic silica powder will bring about dust floating and inhalation risks during use, which often brings inconvenience to production.

[0006] Stable low-viscosity oil-in-water formulations are very rare in the current sunscreen products on the market. Therefore, overcoming the shortcomings of the above-mentioned patents and developing a low-viscosity oil-in-water sunscreen product with both stability and good spreadability has become a technical problem that needs to be solved urgently. Summary of the invention

[0007] In view of the above technical problems, the present invention provides a low-viscosity oil-in-water sunscreen lotion preparation with a viscosity of less than 3000 mPa·s, which solves the stratification problem of low-viscosity oil-in-water sunscreen preparations and avoids the phenomenon of uneven dispersion of sunscreen agents due to personal usage differences caused by the use of shake packaging materials, thereby reducing the sunscreen effect; on the other hand, the low-viscosity oil-in-water sunscreen preparation has improved spreadability and ductility of the product while having good stability, thereby improving the skin feel of the product.

[0008] To achieve this object, the present invention adopts the following technical solutions:

[0009] A low-viscosity water-in-oil sunscreen lotion preparation comprises the following components in parts by weight:

[0010] Emulsifier, 2-6 parts;

[0011] Thickener, 0.2-0.5 parts;

[0012] Sunscreen, 22-40 parts;

[0013] Emollient, 30-50 parts;

[0014] Moisturizer, 6-15 parts;

[0015] Active ingredient, 1-15 parts;

[0016] 1,2-pentanediol, 3 parts;

[0017] Stabilizer, 0.5-1 part;

[0018] Skin feel regulator, 4 parts;

[0019] Water to a total weight of 100 parts.

[0020] Among the above components, sunscreens include water-based sunscreens and oily sunscreens. Water, skin feel regulators, stabilizers, 1,2-pentanediol, moisturizers, active ingredients, and water-based sunscreens belong to the water phase, and emulsifiers, thickeners, emollients, and oily sunscreens belong to the oil phase.

[0021] Preferably, the mass percentage of the oil phase is greater than or equal to 53%.

[0022] Preferably, the emollient comprises silicone oil with a viscosity of 0.65 cst-6 cst, and the mass ratio of silicone oil to oil phase is greater than or equal to 1: 5. More preferably, the mass ratio of silicone oil to oil phase is 1: (3-5).

[0023] More preferably, the silicone oil includes linear silicone oil and / or alkyl-modified silicone oil, the viscosity of the linear silicone oil is ≤5cst; the alkyl-modified silicone oil is octyl polymethylsiloxane. As a non-polar oil, silicone oil is often used in preparations mainly for skin feel adjustment, but in the present invention, the main purpose of using silicone oil in a specific viscosity range is to reduce the viscosity of the oil phase and have good compatibility with other oils, so that the preparation can have a lower viscosity and better stability.

[0024] More preferably, the emollient includes, in addition to silicone oil, C9-12 alkane and coconut oil alcohol-caprylate / caprate.

[0025] Preferably, the thickener is an oil-soluble rheology modifier, and is selected from disteardimethylammonium hectorite or stearalkonium chloride hectorite or a mixture of the two.

[0026] Preferably, the emulsifier is PEG-9 polydimethylsiloxyethyl dimethicone and lauryl PEG-10 tris(trimethylsiloxy)silylethyl dimethicone in a mass ratio of (0.5-1.5):(1.5-4.5). Lauryl PEG-10 tris(trimethylsiloxy)silylethyl polydimethicone has a unique dendritic structure, and its lipophilic end is compatible with both polar and non-polar oils. In preparations containing chemical sunscreens and other polar and non-polar oils, it can efficiently emulsify oils. However, the lipophilic end is relatively large in volume, and some gaps will exist when emulsifying and wrapping oil droplets. Therefore, the present invention selects PEG-9 polydimethylsiloxyethyl polydimethicone emulsifier with a relatively small lipophilic end to be interspersed in the gaps, so that the emulsification system is more stable. PEG-9 polydimethylsiloxyethyl polydimethicone and lauryl PEG-10 tris(trimethylsiloxy)silylethyl polydimethicone are combined to form a specific emulsification system.

[0027] Preferably, the water-based sunscreen is a water-dispersible or water-soluble sunscreen. In the present invention, the water-based sunscreen is methylene bis-benzotriazolyl tetramethylbutylphenol. The oily sunscreen is an oil-soluble sunscreen. In the present invention, it is one or more of ethylhexyl methoxycinnamate, bis-ethylhexyloxyphenol methoxyphenyl triazine, ethylhexyl triazone, polysilicone-15, diethylamino hydroxybenzoyl hexyl benzoate, titanium dioxide or zinc oxide. Among them, ethylhexyl methoxycinnamate, bis-ethylhexyloxyphenol methoxyphenyl triazine, ethylhexyl triazone, polysilicone-15, diethylamino hydroxybenzoyl hexyl benzoate or methylene bis-benzotriazolyl tetramethylbutylphenol are chemical sunscreens, and titanium dioxide and zinc oxide are physical sunscreens.

[0028] More preferably, the titanium dioxide is titanium dioxide with a surface hydrophobic treatment, and the zinc oxide is zinc oxide with a surface hydrophobic treatment.

[0029] Preferably, the humectant includes, but is not limited to, one or more of glycerin, butylene glycol or propylene glycol.

[0030] Preferably, the stabilizer includes but is not limited to one or more of magnesium sulfate, sodium chloride, calcium chloride or magnesium chloride.

[0031] Preferably, the skin feel modifier is silica.

[0032] Preferably, the active ingredient includes but is not limited to one or more of purslane extract, emblica fruit extract or Artemia extract.

[0033] In the present invention, 1,2-pentanediol has both moisturizing properties and can be used as a moisturizer, and also has antiseptic properties and can be used as a preservative. Therefore, the sunscreen preparation of the present invention can achieve a good antiseptic effect without adding a preservative.

[0034] Beneficial effects:

[0035] The low-viscosity water-in-oil sunscreen lotion preparation of the present invention is obtained by controlling the ratio of oil phase to water phase, and combining silicone oil, thickener and specific emulsifier. The viscosity of the sunscreen lotion preparation is controlled within 3000mPa·s and has uniform and fine dispersed particle size.

[0036] This low viscosity water-in-oil sunscreen formulation has the following advantages:

[0037] 1. It has low viscosity and good stability.

[0038] 2. Low viscosity can give the product good spreadability and applicability, solving the common problem of poor applicability of high-viscosity oil-in-water sunscreen preparations and improving the skin feel of the product.

[0039] 3. The good stability means that the product does not need to be shaken with specific packaging materials for secondary emulsification, and it can also avoid the reduction of the sun protection effect of the applied product due to uneven shaking. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 The multiple particle size analyzer TSI diagram of test example 1;

[0041] Figure 2 This is a comparison chart of the suspension performance of Test Example 2. DETAILED DESCRIPTION

[0042] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and through specific implementation methods. However, the following examples are only simplified examples of the present invention and do not represent or limit the scope of protection of the present invention. The scope of protection of the present invention shall be subject to the claims.

[0043] The raw materials used in the following examples and comparative examples are all commercially available products, and the sources of the functional ingredients contained therein are as follows (only the functional ingredients are reflected, and the necessary auxiliary materials contained in other commercially available raw materials are not repeated):

[0044] PEG-9 polydimethylsiloxyethyl dimethicone, trade name KF-6028;

[0045] Lauryl PEG-10 tris(trimethylsiloxy)silylethyl polymethicone, trade name DOWSIL ES-5300 FormulationAid;

[0046] Ethylhexyl methoxycinnamate, sold under the trade name Escalol 557;

[0047] Bis-ethylhexyloxyphenol methoxyphenyl triazine, trade name TINOSORB S;

[0048] Diethylaminohydroxybenzoyl hexyl benzoate, sold under the trade name UvinulAplus Granular;

[0049] Ethylhexyl triazone, trade name T150;

[0050] Polysilicone-15, trade name Parsol SLX;

[0051] Methylene bis-benzotriazolyl tetramethylbutylphenol, trade name Tinosorb M;

[0052] Titanium dioxide, trade name Antilight TI 400AB;

[0053] C9-12 alkane, coconut oil alcohol-caprylate / caprate, trade name VEGELIGHT 1214LC;

[0054] Polydimethylsiloxane, trade name KF-96L-2CS;

[0055] Octyl polymethicone, trade name DOWSILFZ-3196 Fluid;

[0056] Disteardimethylammonium hectorite, trade name BENTONE 38V CG;

[0057] Unless otherwise specified, all percentages in the present invention are by mass percentages.

[0058] Examples 1-2 and Comparative Examples 1-3

[0059] The emulsion was prepared according to the formula in Table 1 below. The specific preparation process is as follows:

[0060] Step 1, add the raw materials of phase A into the pre-mixing tank, stir and dissolve evenly for later use;

[0061] Step 2: Add the B1 phase raw material into the main preparation tank, heat to 80℃-85℃, stir and dissolve evenly,

[0062] Add phase C materials, continue stirring, and start cooling;

[0063] Step 3: When the temperature drops to 40-45°C, slowly add the B2 phase material into the main preparation tank of step 2.

[0064] Mix well;

[0065] Step 4, slowly add the phase A material into the main preparation tank of step 3, and stir at a speed of 1200 r / min for 10 min;

[0066] Step 5: Add the material of Phase D into the main mixing tank of Step 4, and stir at a speed of 1200 r / min for 5 min; Step 6: Add the material of Phase E into the main mixing tank of Step 5, stir at a speed of 1200 r / min for 5 min, and then discharge the material.

[0067] Table 1 Component Ratio Table

[0068]

[0069]

[0070] <Test Example 1>

[0071] Stability Investigation Test:

[0072] Using a Turbiscan stability analyzer, according to the principle of static multiple light scattering technology, systematically test the samples. Specifically, each sample is left to age at room temperature for 24 h, sampled and placed in a dedicated sample bottle. The sample bottle is transferred to the sample cell of the Turbiscan analyzer, and the instrument is set to continuously monitor the sample kinetically for 48 h at a constant temperature of 49 °C. Quantitatively evaluate its stability by calculating the Turbiscan Instability Index (TSI) of the sample. The level of the TSI value directly reflects the stability level of the sample, that is, the lower the TSI index, the higher the stability of the sample. TSI value = (AT / ABS) < 0.2%: Absolutely stable. TSI value = (AT / ABS) is between 0.2% < BS < 0.5%: Moderately stable (problems will occur under harsh conditions). TSI value = (AT / ABS) > 0.5%: Absolutely unstable. For the comparison of stability results, see Figure 1 TSI diagram of the multi-particle size analyzer. Figure 1 In it, E1 represents Example 1, E2 represents Example 2, D1 represents Comparative Example 1, D2 represents Comparative Example 2, and D3 represents Comparative Example 3.

[0073] <Test Example 2>

[0074] Suspension Ability and Viscosity Investigation Test:

[0075] The suspension force of each emulsion is observed by centrifugation. Specifically, for centrifugal stability, the water-in-oil preparations prepared in the examples and comparative examples are placed in a bench centrifuge, and centrifuged at a speed of 3000 r / min for 30 min. Observe whether there is a layering phenomenon. If there is no layering, the system is considered stable; otherwise, the system is considered unstable. The results are shown in Figure 2 .

[0076] The viscosity test parameters are tested using Brookfield RV, No. 05 rotor at 60 rpm. The viscosity test results are shown in Table 2:

[0077] Table 2 Viscosity test results

[0078]

[0079] From the results of stability test, suspension ability and viscosity test, we can know that:

[0080] The emulsion viscosities obtained in Examples 1-2 were 1740 mPa·s and 2673 mPa·s, respectively, meeting the requirement of a low-viscosity oil-in-water emulsion formulation of less than 3000 mPa·s. After centrifugal stability testing, no stratification, demulsification or precipitation was found after centrifugation at 3000 rpm for 30 min, meeting the suspension stability requirement. After being placed in an environment of 49° C., the maximum TSI values ​​observed for 48 h were 0.2% and 0.35%, respectively, meeting the stability requirement of TSI less than 0.5%.

[0081] Example 2 Based on Example 1, the alkyl-modified silicone oil is replaced with linear silicone oil polydimethylsiloxane (2cst) to study the effects of different types of silicone oil on the stability of the emulsion. From the viscosity of the emulsion, it can be seen that the use of linear silicone oil will increase the viscosity of the system, but the viscosity is less than 3000mPa·s, and a low-viscosity oil-in-water sunscreen preparation can still be prepared; secondly, the maximum value of its TSI value increases from 0.2% to 0.35%, and the stability is reduced, but less than 0.5%, and the stability is still at the absolute stability level. Conclusion: The use of linear silicone oil does not change its suspension force, the viscosity of the system is still low, and the stability is good. Therefore, a low-viscosity, stable oil-in-water sunscreen preparation can be prepared.

[0082] The emulsion viscosities of Comparative Examples 1-3 were 1613mPa·s, 4867mPa·s, and 4320mPa·s, respectively (tested at Brookfield RV, 05#, 60rpm). After centrifugal stability test, centrifugation at 3000rpm for 30min revealed that Comparative Examples 1-2 had stratification, demulsification, or precipitation, while Comparative Example 3 had no stratification, demulsification, or precipitation. After being placed in an environment of 49°C, the highest TSI values ​​observed for 48h were 0.5%, 0.65%, and 0.95%, respectively.

[0083] Comparative Example 1 is compared with Example 1. No thickener (disteardimethylammonium hectorite) is added. Although the viscosity is relatively low at 1613 mPa·s, oil is found in the upper layer after centrifugation, indicating that the suspension force of the emulsion of the preparation without the thickener is reduced; Figure 1It can be seen from the multiple particle size analyzer that the highest TSI value of Comparative Example 1 is 0.5%, which is greater than the value of Example 1 of 0.2%, indicating that the stability of the emulsion without thickener is reduced. It can be concluded that without thickener (disteardimethylammonium hectorite), the viscosity of the system can be reduced to prepare a low-viscosity oil-in-water emulsion, but the suspension power and stability of the emulsion are poor. Therefore, a stable low-viscosity oil-in-water sunscreen lotion preparation cannot be prepared.

[0084] Comparative Example 2 is compared with Example 1. All silicone oil components are replaced with oil C12-15 alcohol benzoate. The emulsion viscosity is 4867mPa·s, and an oil-in-water sunscreen preparation with a viscosity of less than 3000mPa·s cannot be prepared; after centrifugal stability test, it is centrifuged at a speed of 3000rpm for 30min, and oil is discharged from the surface, which shows that its suspension stability has not passed; at the same time, it can be seen from the multiple particle size analyzer chart that its highest TSI value has increased to 0.65%, which is greater than 0.5%, and belongs to the absolutely unstable level. It can be concluded that not adding silicone oil will increase the viscosity of the system, and a low-viscosity oil-in-water preparation with a viscosity of less than 3000mPa·s cannot be prepared, and it will affect the suspension stability of the emulsion, causing instability. Therefore, a low-viscosity stable oil-in-water sunscreen preparation cannot be prepared.

[0085] Comparative Example 2 is compared with Example 2. The silicone oil components of the linear silicone oil and the alkyl-modified silicone oil are all replaced by oil C12-15 alcohol benzoate. The emulsion viscosity is 4867mPa·s, and an oil-in-water sunscreen preparation with a viscosity of less than 3000mPa·s cannot be prepared; after centrifugal stability test, the surface oil is produced after centrifugal separation at a speed of 3000rpm for 30min, and it can be seen that its suspension stability has not passed; at the same time, it can be seen from the multiple particle size analyzer chart that the highest value of its TSI has increased to 0.65%>0.5%, which belongs to the absolutely unstable level. It can be concluded that under the conditions of using a thickener and a specific emulsification system, the viscosity of the preparation emulsion that does not contain silicone oil components in the emollient increases, and the stability decreases, so a low-viscosity stable oil-in-water sunscreen preparation cannot be prepared.

[0086] Compared with Example 1, the oil phase content of Comparative Example 3 was reduced from 55.4% to 52.4% (lower than 53%), and the viscosity of the system increased from 1740 mPa·s to 4320 mPa·s, and a low-viscosity oil-in-water sunscreen lotion preparation was not obtained. Due to its relatively high viscosity, after the centrifugal stability test, it was centrifuged at a speed of 3000 rpm for 30 minutes, and there was no stratification, demulsification and precipitation phenomenon, and the suspension force passed; but from the multiple particle size analyzer chart, it can be seen that the highest value of the TSI value of Comparative Example 3 is 0.95%>0.5%, which belongs to the absolute unstable level, indicating that its stability has not passed. It can be concluded that when the oil phase content is too low (less than 53%), the viscosity will increase, and a low-viscosity oil-in-water sunscreen preparation cannot be prepared; due to the increase in viscosity, it has better suspension power, but its stability is reduced. Therefore, a low-viscosity stable oil-in-water sunscreen preparation cannot be prepared.

[0087] Compared with Example 2, the oil phase content of Comparative Example 3 was reduced from 55.4% to 52.4% (lower than 53%), and the system viscosity increased from 2673mPa·s to 4320mPa·s, and a low-viscosity oil-in-water sunscreen lotion preparation was not obtained. Due to its relatively high viscosity, after centrifugal stability test, it was centrifuged at 3000rpm for 30min, without stratification, demulsification and precipitation, and the suspension force passed; but from the multiple particle size analyzer chart, it can be seen that the highest value of the TSI value of Comparative Example 3 is 0.95%>0.5%, which belongs to the absolute unstable level, indicating that its stability has not passed. It can be concluded that when the oil phase content is too low (less than 53%) under the conditions of satisfying the thickener, specific emulsification system, and containing silicone oil components, the viscosity will increase; due to the increase in viscosity, it has better suspension power, but its stability is reduced. Therefore, a low-viscosity, stable oil-in-water sunscreen lotion preparation cannot be obtained.

[0088] <Test Example 3>

[0089] Sensory testing of sunscreen products

[0090] The sunscreen lotion preparation of Example 2 and the sunscreen lotion preparation of Comparative Example 3 were subjected to sensory evaluation. The specific sensory evaluation implementation method was as follows: first, the sunscreen lotion preparation of Example 2 and the sunscreen lotion preparation of Comparative Example 3 were coded, with Example 2 coded as 136 and Comparative Example 3 coded as 268. 19 sensory evaluators were selected to evaluate the two test products from three dimensions, namely, during application, after film formation, and overall preference, by means of paired comparison. The results are shown in Table 3.

[0091] Table 3

[0092]

[0093]

[0094] According to the data in Table 3, the sunscreen lotion in Example 2 has low viscosity, good spreadability when applied, easier to apply evenly, and a lighter and more breathable skin feel. The relative viscosity of Comparative Example 3 is relatively high, the material feels thicker on the skin, has poor spreading properties when applied, and has a stronger oily feel. The sunscreen lotion preparation of Example 2 performs better in terms of spreadability, easy application, and lightness during application and after film formation than the sunscreen lotion preparation of Comparative Example 3, and easy application and lightness are the skin feel experiences pursued by sunscreen products. The overall preference selection is more inclined to Example 2. This shows that the viscosity of the preparation has a relatively large impact on the sensory experience. The low-viscosity oil-in-water sunscreen lotion preparation provided by the present invention has a better sense of use under the premise of having good stability.

[0095] The applicant declares that the above is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention are within the protection scope and disclosure scope of the present invention.

Claims

1. A low-viscosity water-in-oil sunscreen lotion preparation, characterized in that: By weight, it includes the following components: Emulsifier, 2-6 parts; Thickener, 0.2-0.5 parts; Sunscreen, 22-40 parts; Emollient, 30-50 parts; Moisturizer, 6-15 parts; Active ingredient, 1-15 parts; 1,2-pentanediol, 3 parts; Stabilizer, 0.5-1 part; Skin feel regulator, 4 parts; Water to a total weight of 100 parts; The sunscreen includes water-based sunscreen and oil-based sunscreen. The water, skin feel regulator, stabilizer, 1,2-pentanediol, moisturizer, active ingredient, and water-based sunscreen belong to the water phase. The emulsifier, thickener, emollient, and oil-based sunscreen belong to the oil phase. The mass percentage of the oil phase is greater than or equal to 53%. The emollient comprises silicone oil with a viscosity of 0.65 cst-6 cst, and the mass ratio of the silicone oil to the oil phase is greater than or equal to 1:5; The emulsifier is PEG-9 polydimethylsiloxyethyl polydimethylsiloxane and lauryl PEG-10 tri(trimethylsiloxy)silylethyl polydimethylsiloxane in a mass ratio of (0.5-1.5):(1.5-4.5).

2. The low-viscosity water-in-oil sunscreen lotion preparation according to claim 1, characterized in that: The silicone oil includes linear silicone oil and / or alkyl-modified silicone oil, and the viscosity of the linear silicone oil is ≤5cst.

3. The low-viscosity water-in-oil sunscreen lotion preparation according to claim 2, characterized in that: The alkyl-modified silicone oil is octyl polymethylsiloxane.

4. The low-viscosity water-in-oil sunscreen lotion preparation according to claim 3, characterized in that: The mass ratio of the silicone oil to the oil phase is 1:(3-5).

5. The low-viscosity water-in-oil sunscreen lotion preparation according to claim 1, characterized in that: The emollient also includes C9-12 alkane 、 Coco-Caprylate / Caprate.

6. The low-viscosity water-in-oil sunscreen lotion preparation according to claim 1, characterized in that: The thickener is disteardimethylammonium hectorite and / or stearalkonium chloride hectorite.

7. The low-viscosity water-in-oil sunscreen lotion preparation according to claim 1, characterized in that: The water-based sunscreen is methylene bis-benzotriazolyl tetramethylbutylphenol, and the oily sunscreen is one or more of ethylhexyl methoxycinnamate, bis-ethylhexyloxyphenol methoxyphenyl triazine, ethylhexyl triazone, polysilicone-15, diethylaminohydroxybenzoyl hexyl benzoate, titanium dioxide or zinc oxide.

8. The low-viscosity water-in-oil sunscreen lotion preparation according to claim 7, characterized in that: The titanium dioxide is titanium dioxide with a hydrophobic surface treatment, and the zinc oxide is zinc oxide with a hydrophobic surface treatment.

9. The low-viscosity water-in-oil sunscreen lotion preparation according to claim 1, characterized in that: The moisturizer is one or more of glycerin, butylene glycol or propylene glycol; the stabilizer is one or more of magnesium sulfate, sodium chloride, calcium chloride or magnesium chloride; and the skin feel regulator is silica.

10. The low-viscosity water-in-oil sunscreen lotion preparation according to claim 1, characterized in that: The active ingredient component is one or more of purslane extract, emblica fruit extract or Artemia extract.

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