Composition for improving sunscreen performance, product and preparation method of composition

Abstract

The invention discloses a composition for improving sunscreen performance, a product and a preparation method thereof, and the composition comprises the following components in parts by mass: 5-32 parts of difatty acyl pentaerythritol difatty alcohol citrate, 5-32 parts of tribehenin and 61.5-90.9 parts of salicylate derivative. According to the invention, the salicylate sunscreen agent with low greasy feeling is compounded with the di-fatty acyl pentaerythritol di-fatty alcohol citrate and the tribehenin, so that the salicylate sunscreen cosmetics with low sunscreen efficiency originally have excellent sunscreen efficiency while maintaining excellent skin feeling.

Description

Technical Field

[0001] This invention relates to a sunscreen composition, and more particularly to a composition, product, and method of preparation thereof that enhances sunscreen performance. Background Technology

[0002] Ultraviolet (UV) radiation is a major factor in exogenous skin aging and damage. Sunscreens, as the core protective mechanism, can be divided into two categories: inorganic sunscreens (such as zinc oxide and titanium dioxide) – which work by reflecting / refracting UV radiation; and organic sunscreens (such as avobenzone, ethylhexyl methoxycinnamate, and ethylhexyl triazine) – which provide protection by absorbing and converting UV radiation. Currently, sunscreen products are widely used in daily commutes and other sun protection scenarios.

[0003] While the sunscreen market is now widespread, significant contradictory flaws remain in its core technologies, primarily manifested in the conflict between sun protection efficiency and skin feel. From the perspective of organic sunscreens: on the one hand, traditional organic sunscreens (including para-methoxycinnamates, camphor derivatives, benzotriazoles, and octocrylene, etc.) possess excellent sun protection efficiency, achieving strong UV protection and are the core components of current mainstream sunscreens. However, these sunscreens generally suffer from a heavy, greasy feel on the skin; coupled with their inherent permeability, this not only raises safety concerns but also severely impacts the consumer experience due to their oily texture. On the other hand, while salicylic acid sunscreens and related sunscreen synergists offer significant advantages—a refreshing, non-sticky feel that greatly improves product comfort—their core weakness lies in their relatively low sun protection efficiency and limited protective capabilities. Therefore, they are generally not the first choice for sunscreen agents or sunscreen synergists in sunscreen products. From the perspective of inorganic sunscreens: non-nano physical sunscreens usually have advantages such as high temperature resistance and low permeability, but their UV protection efficiency is usually not high and they have problems such as whitening; nano physical sunscreens have higher UV protection efficiency and excellent transparency, but due to their certain photocatalytic activity, they may cause secondary damage to the skin.

[0004] Therefore, how to achieve synergistic effects through the scientific compounding of components and overcome the technical challenges of mutual constraints among multiple dimensions such as sun protection efficiency, skin feel, safety and gentleness has become the core challenge in the current field of sun protection product development.

[0005] To overcome the aforementioned technical bottlenecks, researchers conducted extensive research and discovered that wax components in sunscreen products can enhance sun protection efficacy through multiple mechanisms, while also potentially alleviating the contradiction between skin feel and efficiency. However, different waxes exhibit different crystallization behaviors due to their molecular structures (coarse crystals result in a noticeably coarse texture, affecting sensory experience, while uneven crystallization leads to inconsistent viscosity and texture), resulting in different skin feel and states in cosmetics (such as the refreshing, non-sticky feel achieved by combining cetyl alcohol and stearyl alcohol as proposed in JP2020152569A). Therefore, the type and proportion of wax components are crucial factors in the application of wax components in sunscreen products. Summary of the Invention

[0006] The purpose of this invention is to provide a composition, product, and preparation method for improving sun protection performance. This invention uses a low-greasy salicylic acid ester sunscreen agent compounded with specific wax substances, enabling salicylic acid ester sunscreen cosmetics, which originally had low sun protection efficiency, to maintain excellent skin feel while possessing excellent sun protection efficiency.

[0007] The technical solution of the present invention is a composition for improving sun protection performance, comprising, by weight, 5-32 parts of difatty acyl pentaerythritol difatty alcohol citrate, 5-32 parts of tris(tris(tris(tris(tris(tris(tris(tris(s(s(s(s(s(s(s(s(s(s(")(s(s(s(s(s(s(s(s(s("s(s(s(s(s("s(s(s(s("s(s(s(s(s("s(s(s(s("s(s(s"(s)(s ...s(ss(ss)(s(s(s(ss(ss)(s(

[0008] In the aforementioned composition for enhancing sun protection performance, the carbon chain length of the fatty acyl group of the difatty acyl pentaerythritol difatty alcohol citrate is 8-16, with an average carbon chain length of 12.

[0009] In the aforementioned composition for enhancing sun protection performance, the carbon chain length of the fatty alcohol in the difatty acyl pentaerythritol difatty alcohol citrate is 16-22.

[0010] In the aforementioned composition for enhancing sun protection performance, the carbon chain length of the fatty alcohol in the difatty acyl pentaerythritol difatty alcohol citrate is 18.

[0011] In the aforementioned composition for enhancing sun protection performance, the mass ratio of the difatty acyl pentaerythritol difatty alcohol citrate to tris(t) yumine is 1:5-5:1.

[0012] In the aforementioned composition for enhancing sun protection performance, the mass ratio of the difatty acyl pentaerythritol difatty alcohol citrate to tris(t) yumine is 1:1 to 4:1.

[0013] In the aforementioned composition for enhancing sun protection performance, the salicylate derivative is selected from at least one of ethylhexyl salicylate, octyl salicylate, homosalate, and butyl octyl salicylate.

[0014] In the aforementioned composition for enhancing sun protection performance, the total mass of the mixture of difatty acyl pentaerythritol difatty alcohol citrate and tris(tris(tris(tris(tris(tris(tris(tris(t)))) is 10-38.5% of the total mass of the composition.

[0015] In the aforementioned composition for enhancing sun protection performance, the total mass of the mixture of difatty acyl pentaerythritol difatty alcohol citrate and tris(tris(tris(tris(tris(tris(tris(tris(t)))) and the total mass of the composition accounts for 15-25% of the total mass of the composition.

[0016] The present invention also provides a sunscreen cosmetic comprising the above-described composition.

[0017] In the aforementioned sunscreen cosmetics, the composition is added at a mass of 4-10% of the cosmetic's mass.

[0018] The preparation method of the above-mentioned sunscreen cosmetics includes the following steps:

[0019] (1) Under heating conditions, difatty acyl pentaerythritol difatty alcohol citrate and trisine syringe are dissolved in salicylic acid derivatives to obtain a sunscreen composition;

[0020] (2) Disperse zinc oxide in oil and emulsifier, disperse evenly, and grind thoroughly to obtain a slurry;

[0021] (3) Under heating conditions, the powder is evenly dispersed in the sunscreen composition, and the oil phase component is added to obtain the oil phase;

[0022] (4) Prepare an aqueous phase under heating conditions;

[0023] (5) Add the aqueous phase to the oil phase and emulsify. After cooling, the sunscreen cosmetic is obtained.

[0024] In the aforementioned preparation method, in step (1), the heating temperature is 90-110℃.

[0025] In the aforementioned preparation method, the heating temperature in steps (3) and (4) is 75-85℃.

[0026] In the aforementioned preparation method, in step (1), the oil is selected from at least one of cyclopentamethoxysiloxane, cyclohexamethoxysiloxane, polydimethylsiloxane, straight / branched fatty alcohol fatty acid esters, straight / branched fatty acid polyol esters, isoparaffins, straight / branched fatty alcohol benzoates, straight / branched fatty alcohol salicylate, straight / branched fatty alcohol fruit esters, and fatty acyl amino acid esters.

[0027] In the aforementioned preparation method, in step (2), the emulsifier is selected from at least one of PEG-10 polydimethylsiloxane, PEG-9 polydimethylsiloxane-ethyl polydimethylsiloxane, lauryl PEG-9 polydimethylsiloxane-ethyl polydimethylsiloxane, PEG / PPG-18 / 18 polydimethylsiloxane, lauryl polyglycerol-3 polydimethylsiloxane-ethyl polydimethylsiloxane, bis-PEG / PPG-20 / 5PEG / PPG-20 / 5 polydimethylsiloxane, lauryl PEG-10 tris(trimethoxy)silylethyl polydimethylsiloxane, methoxy PEG / PPG-25 / 4 polydimethylsiloxane, polyglycerol-3 polydimethylsiloxyethyl polydimethylsiloxane, polyglycerol-4 oleate, polyglycerol-3 polyricinoleate, and polyglycerol-3 polyhydroxy fatty acid ester.

[0028] In the aforementioned preparation method, in step (3), the oil phase component includes at least one of dextrin palmitate and lauroyl sarcosine isopropyl ester.

[0029] In the aforementioned preparation method, in step (4), the aqueous phase includes a humectant, an emulsifying stabilizer, and a preservative.

[0030] In the aforementioned preparation method, the humectant is selected from at least one of polyols, sugars, and sodium pyrrolidone carboxylate.

[0031] In the aforementioned preparation method, the emulsifying stabilizer is selected from at least one of sodium chloride, potassium chloride, and magnesium sulfate.

[0032] In the aforementioned preparation method, the preservative is selected from at least one of 1,2-pentanediol, 1,2-hexanediol, ethylhexylglycerin, p-hydroxyacetophenone, and octyl glycol.

[0033] This invention does not impose any special restrictions on the type of sunscreen cosmetic, such as lotion, emulsion, cream, gel, gel cream, foam, spray, and stick. It is understood that when the type of sunscreen cosmetic is different, the sunscreen cosmetic system may also include other excipients, which this invention does not limit. For example, sunscreen cosmetics may also include emollients, emulsifiers, moisturizers, fillers, thickeners, pH adjusters, preservatives, antioxidants, skin conditioning agents, dispersants, fragrances, and deionized water.

[0034] In steps (1) to (5), the mixing methods involved in dispersing zinc oxide and preparing the sunscreen composition are not particularly limited, as long as the dispersion is uniform. These methods include, but are not limited to, stirring dispersers, rotor-stator homogenizers, ultrasonic homogenizers, high-pressure homogenizers, high-pressure microfluidic homogenizers, three-roll mills, ball mills, and bead mills. The equipment speed during the emulsification of the oil and water phases is 3000 rpm to 8000 rpm, and the running time is 3 min to 7 min.

[0035] The mixing temperature in step (3) and the mixing temperature in step (4) are preferably 75-85℃, which can be the same or different; the present invention does not have any special restrictions on the cooling method, such as water bath cooling or natural cooling, etc., and can be cooled to room temperature.

[0036] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0037] This invention selects two waxes with specific structures, difatty acyl pentaerythritol difatty alcohol citrate and trisine, which form a stable and dense eutectic in the salicylate system through strong intermolecular interactions (mainly including van der Waals interactions between wax molecules and dispersion forces between benzene rings and long-chain alkyl groups in salicylate), thereby achieving the effect of enhancing sun protection.

[0038] Specifically, its sun protection enhancement mechanism mainly includes the following three aspects: First, film-forming synergistic protection mechanism: The combination of diacyl pentaerythritol diacyl citrate and tris(2-hydroxymethyl)methacrylate can form a continuous and dense hydrophobic film on the skin surface. This film can not only reduce the loss of sunscreen agents due to sweat rinsing and friction, prolonging the protection time, but also form a synergistic protection system of "physical barrier + ultraviolet absorption / reflection" with inorganic and organic sunscreen agents, further improving the broad-spectrum interception efficiency of UVA / UVB; Second, sunscreen agent dispersion optimization mechanism: diacyl... Pentaerythritol difatty alcohol citrate and sansangene can act as dispersing agents to improve the dispersibility of traditional sunscreens (especially inorganic sunscreens) in the system, preventing them from agglomerating into large particles. This increases the contact area between the sunscreen and ultraviolet rays, improving the sun protection efficacy per unit amount. It also reduces the heaviness and whitening effect caused by the agglomeration of inorganic sunscreens. Thirdly, the synergistic mechanism of skin feel and enhanced protection: the hydrophobicity of pentaerythritol difatty alcohol citrate and sansangene enhances the product's water and sweat resistance, reducing the loss of protection due to water rinsing. In summary, this invention has the advantages of excellent skin feel and good sun protection effect.

[0039] This application, through extensive in vitro sunscreen testing experiments, discovered that there is a strong synergistic effect between the directional combination of tris(x)-yenol and di-fatty acyl pentaerythritol di-fatty alcohol citrate. When applied to a physicochemically combined sunscreen system containing salicylate, it can produce a significant enhanced effect on ultraviolet protection. Attached Figure Description

[0040] Figure 1 This is the crystal structure diagram of dicocoyl pentaerythritol difatty alcohol citrate.

[0041] Figure 2 This is the crystal structure diagram of Sanshanyu essence.

[0042] Figure 3 This is a polarized light micrograph of the crystallization of dicocoyl pentaerythritol distearate citrate in butyl octyl salicylate.

[0043] Figure 4 This is a polarized light micrograph of the crystallization of Sanshan Yujing in butyl octyl salicylate.

[0044] Figure 5 This is a polarized light micrograph of the crystallization of a mixture of dicocoyl pentaerythritol distearate citrate and samara syringe in butyl octyl salicylate.

[0045] Figure 6 This is a polarized light micrograph of the crystallization of a mixture of dicocoyl pentaerythritol distearate citrate and tris(thiocyanate) in ethylhexyl methoxycinnamate. Detailed Implementation

[0046] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present invention.

[0047] The cosmetic ingredients of different embodiments are shown in Table 1, and the cosmetic ingredients of different comparative embodiments are shown in Tables 2 and 3.

[0048] Table 1. Ingredient list of cosmetics in Examples 1-7

[0049]

[0050] Table 2. Ingredient lists of cosmetics from Comparative Examples 1-7

[0051]

[0052] Table 3. Ingredient lists of cosmetics from Comparative Examples 8-13

[0053]

[0054] The dicocoyl pentaerythritol distearate citrate in the above embodiments belongs to difatty acyl pentaerythritol difatty acitrate citrate. Using corresponding raw materials with carbon chains of other lengths, the experimental verification shows that the effect trend is basically the same.

[0055] The oils and fats used in the above embodiments are one or more of the following: cyclopentamethoxysiloxane, cyclohexamethoxysiloxane, polydimethylsiloxane, linear / branched fatty alcohol fatty acid esters, linear / branched fatty acid polyol esters, isoalkanes, linear / branched fatty alcohol benzoates, linear / branched fatty alcohol salicylate, linear / branched fatty alcohol fruit esters, and fatty acyl amino acid esters; the emulsifiers used in the embodiments are PEG-10 polydimethylsiloxane, PEG-9 polydimethylsiloxane-ethyl polydimethylsiloxane, lauryl PEG-9 polydimethylsiloxane-ethyl polydimethylsiloxane, and PEG / PPG-1 One or more of the following—8 / 18 polydimethylsiloxane, lauryl polyglycerol-3 polydimethylsiloxane-ethyl polydimethylsiloxane, bis-PEG / PPG-20 / 5PEG / PPG-20 / 5 polydimethylsiloxane, lauryl PEG-10 tris(trimethoxy)silylethyl polydimethylsiloxane, methoxy PEG / PPG-25 / 4 polydimethylsiloxane, polyglycerol-3 polydimethylsiloxyethyl polydimethylsiloxane, polyglycerol-4 oleate, polyglycerol-3 polyricinoleate, and polyglycerol-3 polyhydroxy fatty acid ester—have achieved essentially the same effect after experimental verification. For brevity, only the experimental results of some examples are listed.

[0056] The preparation method of sunscreen cosmetics includes the following steps:

[0057] (1) Under the condition of heating at 95°C, the difatty acyl pentaerythritol difatty alcohol citrate and trisine syringe were dissolved in salicylic acid derivatives, and the mixture was stirred, dispersed and ground thoroughly using a mechanical stirrer (IKA RW 20 DIGITAL) at a stirring speed of 800 rpm to obtain a sunscreen composition.

[0058] (2) Disperse zinc oxide in oil and emulsifier, disperse evenly, and grind thoroughly to obtain a slurry;

[0059] (3) The powder slurry was mixed and evenly dispersed in the sunscreen composition at 78°C and 500 rpm for 15 min using a stirrer (IKA RW 20 DIGITAL), and the oil phase component was added to obtain the oil phase;

[0060] (4) The raw materials such as humectant, emulsifying stabilizer, and preservative are mixed at 80°C using a mechanical mixer (IKA RW 20 DIGITAL) at a stirring speed of 800 rpm until homogeneous to obtain an aqueous phase;

[0061] (5) Add the aqueous phase to the oil phase, use an IKAT25 DIGITALULTRATURRAX device (homogenizer) to homogenize and mix for 3 minutes at 5000 rpm to emulsify, and then slowly stir and cool to 30°C in a water bath to obtain sunscreen cosmetics.

[0062] All sunscreen cosmetics prepared in the examples and comparative examples, as well as the intermediate sunscreen compositions, were tested. The test indicators and methods are as follows:

[0063] Sun protection effect: Refer to ISO 24443:2021 test method for in vitro sun protection, and use Labsphere UV-2000S to test the in vitro SPF value.

[0064] Microstructure: The prepared sunscreen composition was heated to a molten state (50℃) and stirred for 5 min. 100 μL was then transferred using a pipette and the microstructure and distribution of the sunscreen composition were observed using a polarizing microscope (HiRox-RH2000).

[0065] Dicocoyl pentaerythritol distearate citrate and sansangene were observed under a polarizing microscope (HiRox-RH2000) at 1000x magnification. The crystal structure of dicocoyl pentaerythritol distearate citrate is shown below. Figure 1 As shown, the crystal structure of Sanshan Yujing is as follows: Figure 2 As shown.

[0066] By weight, 25 parts of disopyroxypentaerythritol distearate citrate were dispersed in 75 parts of butyloctyl salicylate. The mixture was observed under a polarizing microscope (HiRox-RH2000) at 1000x magnification. The resulting crystallographic micrograph is shown below. Figure 3 As shown.

[0067] Based on mass fractions, 25 parts of tris(x)-yetine were dispersed in 75 parts of butyl octyl salicylate. The mixture was observed using a polarizing microscope (HiRox-RH2000) at 1000x magnification. The resulting crystallographic micrograph is shown below. Figure 4 As shown.

[0068] According to the mass fraction, 20 parts of dicocoyl pentaerythritol distearate citrate and 5 parts of tris(2,5-dimethyl)hexane were dissolved in 75 parts of butyl octyl salicylate. The composition was observed using a polarizing microscope (HiRox-RH2000) at 1000x magnification. The resulting crystallographic micrograph is shown below. Figure 5 As shown.

[0069] According to the mass fraction, 20 parts of dicocoyl pentaerythritol distearate citrate and 5 parts of tris(2,5-dimethyl)hexyl methoxycinnamate were dissolved in 75 parts of ethylhexyl methoxycinnamate. The composition was observed using a polarizing microscope (HiRox-RH2000) at 1000x magnification. The resulting crystallographic micrograph is shown below. Figure 6 As shown.

[0070] The sun protection efficacy (SPF value) test results of all the sun protection cosmetics in the examples and comparative examples are shown in Table 4.

[0071] Table 4. Sunscreen efficacy of the sunscreen cosmetics in the examples and comparative examples.

[0072]

[0073] As shown in Table 4, this sunscreen composition has a significant synergistic effect on physical sunscreen systems. Specifically, under the same test conditions, comparing Example 1 with Comparative Examples 1-3, it was found that adding only disaccharyl pentaerythritol distearate citrate to butyl octyl salicylate and adding only methyl methacrylate (MSA) did not improve the SPF value as much as adding both in combination. The SPF value of the combined sunscreen product was significantly higher than that of the products with either addition alone, with an increase of approximately 33.8%. For the product without any wax, the increase was as high as 93.9%.

[0074] For Examples 2 and 3, after replacing butyl octyl salicylate with ethylhexyl salicylate and homosalate in sequence, and comparing them with their corresponding comparative examples (Example 2 corresponds to comparative examples 4-6; Example 3 corresponds to comparative examples 7-9), the SPF value of the compounded sunscreen product was still significantly improved compared with the products with or without wax alone. Among them, the overall improvement of the product with ethylhexyl salicylate was between 58.4% and 159.6%, while the improvement of homosalate was smaller, between 22.0% and 29.9%.

[0075] When the concentration of the synthetic wax in the system is changed, it can be seen that the SPF and PA values ​​differ significantly. For example, comparing Example 7 with Comparative Examples 12 and 13, it is evident that when the content of disaccharide pentaerythritol distearate citrate and sansangene in the sunscreen composition is 10% or higher, it has a certain synergistic effect on sun protection. However, when the content is below 10%, there is essentially no synergistic effect. This is because the synergistic effect between disaccharide pentaerythritol distearate citrate and sansangene is essentially due to their strong interaction. However, excessively high wax content places greater demands on the formulation process; therefore, a total wax content of 35% is preferred.

[0076] Structurally, both dicocoyl pentaerythritol distearate citrate and sansangene have multi- and long carbon chain structures, with strong van der Waals forces between the carbon chains, making them prone to forming denser crystals. Figure 1 , 2It can be seen that the dicofarad pentaerythritol distearate citrate forms denser, finer crystals, thus exhibiting a stronger melting feel and spreadability; while sansangyu is an amorphous crystal, thus possessing good flexibility, spreadability, and durability. The two interact strongly, inducing crystallization that combines the characteristics of both; salicylic acid derivatives, due to their benzene ring and hydrophobic structure, can further supplement the hydrophobic interface between sansangyu and dicofarad pentaerythritol distearate citrate through van der Waals forces and dispersion forces, thereby inducing the crystallization of these two waxes at lower concentrations. This allows organic sunscreens, which originally only absorb ultraviolet rays, to scatter light, producing a synergistic effect.

[0077] The differences among different salicylate derivatives can be attributed to their structural relationships. Structurally, ethylhexyl salicylate, with its shorter molecular chain and less intermolecular steric hindrance, can better bind to the ester groups of waxes, producing a synergistic effect. Butyloctyl salicylate, with its longer hydrophobic chain, exhibits both van der Waals forces and steric hindrance with waxes, resulting in a lower sun protection enhancement compared to ethylhexyl salicylate. Homosalate, with its trimethylcyclohexanol hydrophobic portion, has the greatest steric hindrance among the three salicylate derivatives. Furthermore, its numerous branches inhibit wax crystallization, leading to the worst sun protection enhancement. When the content of mixed waxes in a sunscreen composition is too low, the salicylate esters may actually inhibit crystallization, thus having little effect on improving sun protection efficacy.

[0078] In addition, Table 4 shows the different effects of the ratio of the two waxes on the sun protection enhancement of the product. Comparing Examples 4-6 with Comparative Examples 10-11, it can be seen that the ratio of the two waxes has a significant impact on the sun protection enhancement. The product with a 1:1 ratio has the best sun protection effect, with an SPF of 96 and a PA of 14.88. Furthermore, the ratio between 1:5 and 5:1 also shows good effects. However, further expanding the ratio range to 1:9 and 9:1 significantly reduces the sun protection effect to 66-71, a decrease of 35.2%-45.5%. This is because when the wax content of a single component is too high, the intermolecular interactions decrease. When salicylic acid derivatives are introduced, the highly polar oils have a significant impact on the wax crystallization system, weakening the wax crystallization behavior. Figure 3-5It is evident that single types of wax exhibit different crystallization phenomena when encountering highly polar oils. For example, dicocoyl pentaerythritol distearate citrate shows significant lattice collapse in oils, inhibiting its crystallization. Mitsubagar remains in an amorphous crystalline state and cannot achieve the ultraviolet light scattering behavior of crystals, so its sun protection effect is poor. However, a mixture of the two in a certain proportion exhibits dense and stable crystallization behavior in highly polar oils, thus showing a significant sun protection enhancement effect.

[0079] Although the interaction between dicocoyl pentaerythritol distearate citrate and sansangene is relatively strong, it only has a significant synergistic effect on some sunscreen agents, such as... Figure 5 , 6 As shown. Figure 5 This is a crystal microstructure diagram of the mixture of the two in butyl octyl salicylate. Figure 6 This is a microstructure diagram of the crystal structure of the mixture of the two in ethylhexyl methoxycinnamate. Comparing the two, the crystals in butyl octyl salicylate are continuous and dense, while the crystals in ethylhexyl methoxycinnamate are more sparse. This further demonstrates the promoting effect of salicylic acid derivatives on the crystallization of disopyroxypentaerythritol distearate citrate and tris(thiamethoxam)hexene, thereby achieving the sun protection enhancement effect of salicylic acid derivative sunscreen cosmetics.

[0080] In summary, the sunscreen composition of the present invention, when using two waxes, disodium palmitate distearate citrate and sansangene, can significantly improve the SPF of salicylic acid derivative sunscreens, enabling the originally refreshing sunscreen to possess high sun protection performance. Furthermore, this sunscreen has good film-forming effect, spreadability, gentleness, dryness, and is washable without the addition of film-forming agents, and has broad market prospects.

[0081] The parts of this invention not described in detail are prior art and therefore will not be specifically described here.

Claims

1. A composition for improving sun protection performance, characterized in that: Based on parts by weight, it includes 5-32 parts of difatty acyl pentaerythritol difatty alcohol citrate, 5-32 parts of tris(2-3-3)-yoketine, and 61.5-90.9 parts of salicylate derivatives.

2. The composition for improving sun protection performance according to claim 1, characterized in that: The carbon chain length of the fatty acyl group in the difatty acyl pentaerythritol difatty alcohol citrate is 8-16.

3. The composition for improving sun protection performance according to claim 1, characterized in that: The carbon chain length of the fatty alcohol in the difatty acyl pentaerythritol difatty alcohol citrate is 16-22.

4. The composition for improving sun protection performance according to claim 1, characterized in that: The mass ratio of the difatty acyl pentaerythritol difatty alcohol citrate and the tris(x) syringe is 1:5-5:

1.

5. The composition for improving sun protection performance according to claim 4, characterized in that: The mass ratio of the difatty acyl pentaerythritol difatty alcohol citrate to tris(t) yumine is 1:1-4:

1.

6. The composition for improving sun protection performance according to claim 1, characterized in that: The salicylate derivative is selected from at least one of ethylhexyl salicylate, octyl salicylate, homosalyl salicylate, and butyloctyl salicylate.

7. The composition for improving sun protection performance according to claim 1, characterized in that: The total mass of the mixture of difatty acyl pentaerythritol difatty alcohol citrate and trisine syringe comprises 10-38.5% of the total mass of the composition.

8. The composition for improving sun protection performance according to claim 7, characterized in that: The total mass of the mixture of difatty acyl pentaerythritol difatty alcohol citrate and tris(tri ...t)))) occupies 15-25% of the total mass of the composition.

9. A sunscreen cosmetic, characterized in that: It comprises the composition according to any one of claims 1-8.

10. The sunscreen cosmetic according to claim 9, characterized in that: The composition is added at a mass of 4-10% of the cosmetic mass.

11. The method for preparing sunscreen cosmetics according to claim 9, characterized in that: Includes the following steps: (1) Dissolve difatty acyl pentaerythritol difatty alcohol citrate and trisine in a salicylic acid derivative to obtain a sunscreen composition; (2) Disperse zinc oxide in oil and emulsifier, disperse evenly, and grind thoroughly to obtain a slurry; (3) Disperse the powder evenly in the sunscreen composition and add the oil phase component to obtain the oil phase; (4) Prepare the aqueous phase; (5) Add the aqueous phase to the oil phase and emulsify to obtain sunscreen cosmetics.

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