Sunscreen synergistic composition with good film-forming property and gas barrier property

Abstract

The invention discloses a sunscreen synergistic composition with good film-forming property and gas barrier property, and belongs to the technical field of chemical sunscreen agents. The sunscreen synergistic composition is prepared from the following components in percentage by mass: 7 percent of cyclic gamma-polyglutamic acid, 63 percent of pullulan, 3.5 percent of sodium hyaluronate and 26.5 percent of Ectoine. The invention has the beneficial effects that the irritation of the sun-screening agent to the skin can be obviously reduced, the moisturizing effect is strong, the moisture loss and harmful element inflow are prevented, and the sun-screening power of the product is improved; in an oil-in-water system, the washability of the sunscreen product can be improved, so that the product is easier to remove makeup; in a water-in-oil system, the water-repellent agent is synergistically matched with a waterproof film-forming agent, so that a formed skin film has good hydrophobicity, and the waterproof performance of the sunscreen spray is greatly improved.

Description

Technical Field

[0001] The invention relates to a sunscreen synergistic composition, in particular to a sunscreen synergistic composition with good film-forming property and gas barrier property, belonging to the technical field of chemical sunscreen agents. Background Art

[0002] At present, sunscreen sprays generally have the following problems: (1) Insufficient sun protection: The application standard of sunscreen is 2mg / cm 2 , while the sunscreen spray is far below this index and it is difficult to meet the sun protection standard; (2) Short sun protection duration: The sun protection duration is short, generally you need to re-spray every 2 hours; (3) Large dosage: Because the sun protection effect is not strong enough and the sun protection time is short, the dosage is large. However, the price is the same as sunscreen when the dosage is the same, so there is no price advantage compared with sunscreen; (4) Poor water resistance: Sweating and swimming will dilute the sunscreen spray. Summary of the invention

[0003] In order to solve the deficiencies of the prior art, the object of the present invention is to provide a sunscreen synergistic composition with good film-forming and gas barrier properties.

[0004] In order to achieve the above object, the present invention adopts the following technical solution: A sunscreen synergistic composition with good film-forming property and gas barrier property, the sunscreen synergistic composition is composed of cyclic γ-polyglutamic acid, pullulan, sodium hyaluronate and ectoine, and the amount of each component is as follows in terms of mass percentage: Cyclic γ-polyglutamic acid 7%; Pullulan 63%; Low molecular weight sodium hyaluronate 3.5%; Ecdoin 26.5%.

[0005] Preferably, the aforementioned sunscreen synergistic composition is prepared by the following method: The components are added into a powder mixer or a convection mixer according to a certain proportion, and mixed evenly under low-speed stirring to obtain a sunscreen synergistic composition.

[0006] The present invention is beneficial in that: (1) The sunscreen synergistic composition provided by the present invention can significantly reduce the irritation of sunscreen agents to the skin, effectively moisturize, prevent water loss and the influx of harmful elements, and improve the sunscreen effect of the product; (2) In an oil-in-water system, it can improve the rinsability of sunscreen products, making the products easier to remove, and is suitable for adding to sunscreen products in autumn and winter; (3) When used in conjunction with a waterproof film-forming agent in an oil-in-water system, the formed skin film can have good hydrophobicity, greatly improving the waterproof performance of the sunscreen spray. DETAILED DESCRIPTION

[0007] The present invention is described in detail below with reference to specific embodiments.

[0008] 1. Preparation of sunscreen synergistic composition 1. Composition of the sunscreen synergistic composition The sunscreen synergistic composition provided by the present invention is composed of cyclic γ-polyglutamic acid, pullulan, sodium hyaluronate and ectoine. The amount of each component is as follows in terms of mass percentage: Cyclic γ-polyglutamic acid 7%; Pullulan 63%; Low molecular weight sodium hyaluronate (HA-TLM) 3.5%; Ecdoin 26.5%.

[0009] 2. Analysis of ingredients of sunscreen synergistic composition Cyclic γ-polyglutamic acid: It has a ring structure and a lower molecular weight. It is relatively stable under dry and room temperature conditions. Compared with polyglutamic acid, its structure is more stable and not easily decomposed. It has excellent moisturizing properties and can form a moisturizing film on the skin surface to lock in moisture, prevent moisture evaporation, keep the skin hydrated, and increase the softness of the skin. When used in combination with hyaluronic acid, it has a synergistic effect and can enhance the moisturizing and repairing effects of the product.

[0010] Pullulan: It has acid and alkali resistance, adsorption, viscosity, biodegradability, film-forming properties and membrane impermeability. It can form a film on the skin surface to prevent water loss and the influx of harmful elements.

[0011] Ecdoin: It stabilizes the osmotic pressure and retains moisture in the intracellular environment, produces an emergency protective response to prevent cell sunburn, and provides multiple protections for epidermal cells, thereby resisting damage from high-temperature ultraviolet rays.

[0012] The synergistic effect of cyclic γ-polyglutamic acid, pullulan, sodium hyaluronate and ectoine can provide excellent long-lasting moisturizing function, and form a thin film on the skin surface, locking a large amount of chemical sunscreen in the film. While providing continuous sun protection, it can reduce the irritation of chemical sunscreen to the skin. At the same time, through the synergistic effect with waterproof film-forming agents, the formed film can have excellent waterproof properties, which is very suitable for use in sunscreen spray.

[0013] 3. Preparation method of sunscreen synergistic composition The preparation method of the sunscreen synergistic composition is specifically as follows: Add the components into a powder mixer (or convection mixer) according to the above proportions, set the speed to 33 r / min, mix for 6-8 minutes, and obtain a sunscreen synergistic composition after uniform mixing. The sunscreen synergistic composition is a white powder.

[0014] 2. Testing the effect of sunscreen synergistic composition 1. Effect of using in water-in-oil sunscreen spray system A certain brand of oil-in-water sunscreen spray was purchased directly from the market, and the sunscreen synergistic composition prepared above was added thereto. The added amounts were 1% (w / v), 2% (w / v), 3% (w / v), 4% (w / v), and 5% (w / v), and the sunscreen effect of each group of sunscreen spray was tested.

[0015] Continue to add waterproof film-forming agents (for example, acrylic film-forming agents, propylene ester film-forming agents, polymethyl methacrylate film-forming agents, polydimethylsiloxane film-forming agents, trimethylsiloxysilicate film-forming agents, and polydimethylsiloxane film-forming agents are added in this embodiment) to the above-mentioned groups of sunscreen sprays, with the addition amount being 1% (w / v), and the sunscreen effect and waterproofness of each group of sunscreen sprays are tested again.

[0016] Testing method for sunscreen effect: The sunscreen effect of each group of sunscreen sprays was tested in accordance with the "Method for Determination of Sunscreen Index (SPF Value) of Sunscreen Cosmetics" and "Method for Determination of Long-wave Ultraviolet Protection Index (PFA Value) of Sunscreen Cosmetics" in the "Technical Specifications for Safety of Cosmetics" (2015 edition).

[0017] Waterproof property testing method: After the sunscreen effect test is completed, the samples used for testing the sunscreen effect are placed at a temperature of 38°C, and then sprayed with 0.9% saline at a rate of 30 ml / min for 30 minutes. The SPF values ​​of the samples are measured according to the above sunscreen effect testing method, and the difference between the SPF value before spraying with saline and the SPF value 30 minutes after spraying with saline is used as the criterion for judging the waterproof property. The smaller the difference, the better the waterproof property, and the larger the difference, the worse the waterproof property.

[0018] The test results of the sunscreen effect and water resistance of each group of sunscreen sprays are shown in Table 1.

[0019] Table 1 Test results of sunscreen effect and water resistance of each group of sunscreen sprays

[0020] 2. Effect of using in oil-in-water sunscreen spray system A certain brand of oil-in-water sunscreen spray was purchased directly from the market, and the sunscreen synergistic composition prepared above was added thereto. The added amounts were 1% (w / v), 2% (w / v), 3% (w / v), 4% (w / v), and 5% (w / v), respectively, and the sunscreen effect of each group of sunscreen spray was tested.

[0021] The method for testing the sunscreen effect is the same as above and will not be repeated here.

[0022] The test results of the sunscreen effect of each group of sunscreen sprays are shown in Table 2.

[0023] Table 2 Test results of sunscreen effects of each group of sunscreen sprays

[0024] From Table 1 and Table 2, we can see that: (1) After adding the sunscreen synergistic composition prepared by the present invention to the water-in-oil sunscreen spray system and the oil-in-water sunscreen spray system, the SPF value and PFA value of the sunscreen spray are significantly improved, which indicates that the sunscreen synergistic composition prepared by the present invention can significantly improve the sunscreen effect of the sunscreen spray; (2) In the water-in-oil sunscreen spray system, the sunscreen synergistic composition prepared by the present invention is synergistically matched with a water-resistant film-forming agent to make the product have stronger water resistance.

[0025] 3. Spraying experience Compared with the water-in-oil sunscreen spray and the oil-in-water sunscreen spray purchased directly from the market, after adding different proportions (1%, 2%, 3%, 4%, 5%) of the sunscreen synergistic composition prepared by the present invention to these sunscreen sprays, the testers generally reported that: (1) The irritation of sunscreen to the skin is significantly reduced; (2) The moisturizing effect is significantly enhanced; (3) After the sunscreen synergistic composition prepared by the present invention is added to the oil-in-water sunscreen spray, it is easier to rinse and remove makeup (because pullulan is water-soluble); (4) After adding the sunscreen synergistic composition prepared by the present invention and the waterproof film-forming agent to the water-in-oil sunscreen spray, it has strong waterproof properties (because the sunscreen synergistic composition prepared by the present invention and the waterproof film-forming agent can form a skin film with good hydrophobicity after synergistic combination, thereby greatly improving the waterproof performance of the sunscreen spray).

[0026] It should be noted that the above embodiments are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is impossible to list all the embodiments here. Any obvious changes or modifications derived from the technical solution of the present invention are still within the scope of protection of the present invention.

Claims

1. A sunscreen synergistic composition having good film-forming properties and gas barrier properties, characterized in that: The sunscreen synergistic composition is composed of cyclic γ-polyglutamic acid, pullulan, sodium hyaluronate and ectoine, and the amount of each component is as follows in terms of mass percentage: Cyclic γ-polyglutamic acid 7%; Pullulan 63%; Low molecular weight sodium hyaluronate 3.5%; Ecdoin 26.5%.

2. The sunscreen synergistic composition with good film-forming property and gas barrier property according to claim 1, characterized in that: The sunscreen synergistic composition is prepared by the following method: The components are added into a powder mixer or a convection mixer according to a certain proportion, and mixed evenly under low-speed stirring to obtain a sunscreen synergistic composition.

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