CN110664661A

CN110664661A - Mild repairing skin-brightening sunscreen lotion and preparation method thereof

Info

Publication number: CN110664661A
Application number: CN201911059227.2A
Authority: CN
Inventors: 王永胜; 刘丑; 杨春勇
Original assignee: Shaanxi Chongwen Biotechnology Co Ltd
Current assignee: Shaanxi Chongwen Biotechnology Co Ltd
Priority date: 2019-11-01
Filing date: 2019-11-01
Publication date: 2020-01-10

Abstract

The invention discloses a sun-screening cream for mildly repairing and brightening skin, which consists of a multi-component sun-screening agent, a humectant, an emollient, an emulsifier, a thickener, a skin conditioner, a preservative, an aromatic and the balance of water; also comprises a preparation method, which comprises the following steps: step 100, forming a water phase component, meanwhile, pre-mixing propylene glycol in the multi-component sun-screening agent, adding the propylene glycol into a water phase tank, mixing the propylene glycol with the water phase component, heating the water phase tank in vacuum, and keeping the temperature and stirring; step 200, forming oil phase components, and heating, stirring and dissolving; step 300, extracting the water phase component and the oil phase component, adding the water phase component and the oil phase component into a main tank, carrying out vacuum homogenization and emulsification, cooling, and adding a thickening agent and a preservative; step 400, continuously cooling, adjusting the solution state, carrying out warm keeping, adding an aromatic, taking the semi-finished product out of the kettle, and completing preparation after detection; the sunscreen cream has strong sunscreen function and certain repairing effect, can brighten the skin color, and simultaneously reduces irritant components and side effects thereof on the skin.

Description

Mild repairing skin-brightening sunscreen lotion and preparation method thereof

Technical Field

The invention relates to the technical field of skin care products, in particular to mild repairing skin-brightening sunscreen lotion and a preparation method thereof.

Background

The sunscreen emulsion is a skin care product which is prepared by utilizing a sunscreen principle and is used for protecting skin from being irradiated by ultraviolet rays so as to prevent melanin from being generated and accumulated, and is coated on the skin to prevent sunlight from contacting the skin. The sun-screening cream is mainly different from sun-screening cream in physical properties, the common water content of the cream is about 60 percent, and the cream looks thicker and is pasty; the emulsion has a water content of more than 70 percent, looks relatively thin and has fluidity. According to different sun protection principles, the organic sun protection agent can be divided into inorganic sun protection agents and organic sun protection agents, wherein the inorganic sun protection agents are mainly used for reflection, and the organic sun protection agents are mainly used for absorption.

Sunscreens tend to see the two letters "PA". Science has demonstrated that UVA-1 is an allege in causing skin aging, so japanese scientists have developed sunscreens specifically against UVA-1 and expressed the strength of defense as a "+". PA correctly says Protection of UVA-1, its degree is marked by three intensities ++, the more "+" words, the better the effect of preventing UVA-1.

The sun block forms a layer of film on the surface of human skin to wrap the skin, so that the sun block absorbs ultraviolet rays and chemically reacts with the skin to form other substances, thereby counteracting the damage caused by the ultraviolet rays and reducing the influence of direct sunlight on the skin. In addition, the existing sunscreen components are easily polluted by microorganisms, so that the existing sunscreen emulsion contains high content of preservatives, but the components such as the preservatives are easy to generate stress phenomena on the skin, and the skin generates side effects such as inflammation.

Disclosure of Invention

In order to overcome the defects of the prior art scheme, the invention provides the mild repairing and skin-brightening sunscreen emulsion and the preparation method thereof, the mild repairing and skin-brightening sunscreen emulsion has reasonable component matching, is fresh and cool without greasy, has stronger repairing and sunscreen effects while sun-screening, simultaneously reduces the side effects of irritant components such as the content of preservatives and the like on the skin, can effectively solve the defect that only simple sun-screening but no repairing exists in the background technology, and simultaneously solves the problem that the high-content preservatives generate irritation on the skin.

The technical scheme adopted by the invention for solving the technical problems is as follows:

the sun-screen lotion for mildly repairing and brightening skin is characterized by comprising the following raw materials in parts by weight:

20-64% of a multi-component sunscreen agent, 4.5-17% of a humectant, 3.1-16% of an emollient, 1.5-7% of an emulsifier, 1-5% of a thickener, 1.11-6.5% of a skin conditioner, 0.1-0.5% of a preservative, 0.1-0.5% of a fragrance and the balance of water.

Preferably, the multi-component sunscreen agent comprises the following raw materials in parts by weight:

5-15% butyl octanol salicylate/titanium dioxide/tris (ceteareth-4) phosphate/polydimethylsiloxane cross-linked polymer/silica, 5-10% ethylhexyl methoxycinnamate, 3-7% octocrylene, 1-6% methylenebis-benzotriazolyl tetramethylbutylphenol/decyl glucoside/xanthan gum/propylene glycol, 1-5% ethylhexyl salicylate, 2-8% bis-ethylhexyloxyphenol methoxyphenyl triazine, 1-5% ethylhexyl triazone, 2-8% diethylamino hydroxybenzoyl hexyl benzoate.

Preferably, the humectant is prepared from the following raw materials in parts by weight: 2-8% of glycerol, 2-8% of propylene glycol and 0.5-1% of 1, 2-hexanediol;

the emollient is composed of the following raw materials in parts by weight: 1 to 5% of diethylhexyl carbonate, 1 to 5% of C12-15 alcohol benzoate, 1 to 5% of caprylic/capric triglyceride, and 0.1 to 1% of tocopherol acetate.

Preferably, the emulsifier is prepared from the following raw materials in parts by weight: 1-5% of potassium cetyl phosphate and 0.5-2% of sodium stearyl glutamate;

the thickening agent consists of 1-5% of acrylic acid (ester) copolymer in parts by mass;

the skin conditioner is prepared from the following raw materials in parts by weight: 1-5% of polymethylsilsesquioxane, 0.1-1% of dipotassium glycyrrhizinate and 0.01-0.5% of EDTA disodium;

the preservative consists of 0.1-0.5% of phenoxyethanol/ethylhexyl glycerin in parts by mass;

the aromatic consists of 0.1-0.5% of essence in parts by weight.

In addition, the invention also provides a preparation method of the mild repairing skin-brightening sunscreen emulsion, which comprises the following steps:

step 100, uniformly mixing an emulsifier, a skin conditioner and a humectant to form a water phase component, simultaneously pre-mixing methylene bis-benzotriazolyl tetramethyl butyl phenol/decyl glucoside/xanthan gum/propylene glycol in the multi-component sunscreen agent, adding the mixture into a water phase tank, mixing the mixture with the water phase component, heating the water phase tank to 80-85 ℃ in vacuum, and stirring for 20 minutes under heat preservation;

step 200, uniformly mixing other components in the multi-component sun-screening agent and the emollient to form an oil phase component, heating to 80 ℃, and stirring to dissolve;

step 300, extracting the water phase component and the oil phase component, adding the water phase component and the oil phase component into a main tank, carrying out vacuum homogenization and emulsification for 4-6 minutes, cooling to 45 ℃, and adding a thickening agent and a preservative;

and step 400, continuously cooling to 35-40 ℃, adjusting the solution state, carrying out warm keeping, adding an aromatic, taking the semi-finished product out of the kettle, and detecting to finish the preparation.

Preferably, in step 100, the water component is heated in vacuum by the following specific steps:

step 101, heating water components in a low-pressure environment of-0.1 MPa to-0.15 MPa in stages, firstly heating the mixed solution to 40-60 ℃ at the speed of 5-10 ℃/min, maintaining the temperature for 10-30 min, and carrying out pulse temperature heating on the mixed solution in a periodic manner in the process of maintaining the temperature;

and 102, heating the mixed solution to 80-85 ℃ at the speed of 1-5 ℃/min, keeping the temperature unchanged after the temperature reaches the temperature range, and continuously and periodically fluctuating the temperature of the mixed solution within the range of 80-85 ℃ in a random heating mode.

Preferably, in step 300, the specific steps of mixing and homogenizing and emulsifying the oil phase component and the water phase component are as follows:

301, maintaining the temperature and the pressure of the oil phase component and the water phase component, quickly pouring the oil phase component into the water phase component, and continuously stirring until the oil phase component and the water phase component are uniformly mixed;

step 302, after the two are uniformly mixed, vacuumizing again, synchronously homogenizing and emulsifying by a homogenizer and an emulsifying machine, wherein the rotating speed for vacuum homogenizing and emulsifying is 3500r/min, maintaining the state and rapidly cooling to 45 ℃ after homogenizing and emulsifying, and sequentially adding the rest materials;

step 303, heating the mixed solution in a pulse heating mode after adding the excess materials, wherein the temperature range of the mixed solution is 40-45 ℃.

Preferably, in step 300, after adding the thickener and the preservative by homogeneous emulsification, 10-20% of propylene glycol is added and mixed thoroughly, impurities in the propylene glycol are removed by evaporation under vacuum through a rotary evaporator, the propylene glycol is diluted by adding a buffer solution, and the propylene glycol is dispersed until a milky white dispersion liquid is formed, nitrogen is introduced to remove residues in the propylene glycol, then the buffer solution is added, and the mixture is prepared for standby after ultrasonic treatment and filtration through a filter membrane.

Preferably, between the step 300 and the step 400, after the triethanolamine is added and the temperature is reduced, the mixed solution is heated to 60-80 ℃, and the temperature is kept unchanged for 30-60 min until the alcohol solution in the mixed solution is evaporated.

Preferably, in step 400, the mixing conditions and the mixing method thereof are specifically: and continuously cooling to 40 ℃, adjusting the pH value to 6.5-7.0, synchronously adding the standby solution, increasing the pressure of the mixture to 0.4-0.6 MPa, and continuously stirring until the standby solution is completely dissolved in the mixture.

The invention has the beneficial effects that:

according to the invention, through forming the emulsion, main sunscreen components can be attached to the surface of the skin, and the components such as the humectant and the like are fully mixed, so that the humidity of the sunscreen components is kept, floccules formed on the surface of the skin by coagulation are avoided, and the use experience is influenced; the preparation process provided by the invention has the characteristics of simplicity and easiness in operation, and the sunscreen emulsion can be rapidly produced in batches.

Drawings

FIG. 1 is a schematic flow diagram of the present invention;

FIG. 2 is a schematic view of the structure of a manufacturing apparatus of the present invention;

in the figure: 1-a support; 2-a temperature and pressure reactor; 3-a first feed pipe; 4-pre-mixing tank for water phase and oil phase; 5-second feeding pipe.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The invention provides a sun block for mild repairing and skin brightening, which is prepared from the following raw materials in parts by weight:

The multi-component sunscreen agent comprises the following raw materials in parts by weight:

The humectant is prepared from the following raw materials in parts by weight: 2-8% of glycerol, 2-8% of propylene glycol and 0.5-1% of 1, 2-hexanediol.

The emulsifier is prepared from the following raw materials in parts by weight: 1-5% of potassium cetyl phosphate and 0.5-2% of sodium stearyl glutamate.

The thickening agent is composed of 1-5% of acrylic acid (ester) copolymer in parts by mass.

The skin conditioner is prepared from the following raw materials in parts by weight: 1-5% of polymethylsilsesquioxane, 0.1-1% of dipotassium glycyrrhizinate and 0.01-0.5% of EDTA disodium.

The preservative consists of 0.1-0.5% of phenoxyethanol/ethylhexyl glycerin in parts by mass.

The aromatic consists of 0.1-0.5% of essence in parts by weight.

In this embodiment, a repair component may be added to the overall formulation, such as a repair agent including oat (AVENASATIVA) β -glucan, methylsilanol mannuronate, polypeptide, and the like. Therefore, the components in the sunscreen cream have sunscreen capacity and certain repair capacity, can repair skin while protecting, and have two functions.

The ingredients in the formula are reasonably matched, the effective ingredients in the formula can be uniformly mixed, the sunscreen ingredients form a protective film on the surface of the skin, the composition and the structure of the sunscreen ingredients are similar to those of the skin, so that a water-based protective layer is more easily formed on the surface of the skin, a uniform protective film is formed on the surface of the skin, the damage of ultraviolet rays in sunlight to the skin is reduced, the repairing ingredients enter the surface layer of the skin to repair the sunburn part, and the whole product is fresh and non-greasy on the surface of the skin.

Because the existing product is easily polluted by microorganisms, a lot of preservatives are added into the sun-proof products on the market, particularly the products with high sun-proof indexes to ensure the shelf life of the products, and the side effect is that skin allergy and irritation are easily caused. The formula of the invention only adds a very small amount of preservative, so that the product has a shelf life, is mild to human skin, does not produce irritation reaction to human body, and particularly has a good sunscreen effect on sensitive skin.

As shown in fig. 1, the invention also provides a preparation method of the mild repairing skin-brightening sunscreen emulsion, which comprises the following steps:

step 100, uniformly mixing an emulsifier, a skin conditioner and a humectant to form a water phase component, simultaneously pre-mixing methylene bis-benzotriazolyl tetramethyl butyl phenol/decyl glucoside/xanthan gum/propylene glycol in the multi-component sunscreen agent, adding the mixture into a water phase tank, mixing the mixture with the water phase component, heating the water phase tank to 80-85 ℃ in vacuum, and stirring for 20 minutes under heat preservation.

The heating by this method has the effect of completely and sufficiently dispersing the aqueous phase component between the respective components, thereby providing an aqueous phase mixture component having an optimum homogeneity.

In step 100, the water component is vacuum heated by the following specific steps:

step 101, heating water components in a low-pressure environment of-0.1 MPa to-0.15 MPa in stages, firstly heating the mixed solution to 40-60 ℃ at a speed of 5-10 ℃/min, and maintaining the temperature for 10-30 min, and in the process of maintaining the temperature, carrying out pulse temperature heating on the mixed solution in a periodic mode, wherein the pulse heating mode is to destroy the balance in a low-temperature state, so that the mixture is always in a disordered non-equilibrium state, and the mixture is conveniently and fully mixed;

step 102, heating the mixed solution to 80-85 ℃ at a speed of 1-5 ℃/min, keeping the temperature unchanged after reaching the temperature range, and continuously and periodically fluctuating the temperature of the mixed solution within the range of 80-85 ℃ in a random heating mode, wherein the random heating mode is also used for destroying the internal heating balance, and the random heating mode has the function of forming an unbalanced mixture, so that the water phase components are continuously collided and crossed under the unbalanced environment, and better mixing is achieved.

The staged heating method according to the present embodiment can sufficiently soak and preheat the components therein, so that the main components are wetted and soaked at a low temperature for the same time, and thus form a gel-like structure. On the other hand, after the colloid-like structure is formed under the low temperature condition, the original colloid-like structure can be destroyed through rapid high-temperature heating, so that the colloid-like structure can be rapidly fused at high temperature.

Step 200, mixing other components in the multi-component sunscreen agent and the emollient uniformly to form an oil phase component, heating to 80 ℃, and stirring to dissolve.

In the above, since the main active ingredient of the sunscreen agent is oil-soluble, it can be added to the aqueous phase after being mixed with a polyhydric alcohol (herein, the polyhydric alcohol includes glycerin and propylene glycol) to promote the dissolution of various ingredients, and in addition, other ingredients are oil-soluble and must be added to the oil phase.

And step 300, extracting the water phase component and the oil phase component, adding the water phase component and the oil phase component into a main tank, carrying out vacuum homogenization and emulsification for 4-6 minutes, cooling to 45 ℃, and adding a thickening agent and a preservative.

In step 300, the specific steps of mixing and homogenizing the oil phase component and the water phase component are as follows:

In the method, the temperature and pressure states of the original components are maintained, and the original components are directly mixed, so that the phenomena of instant boiling and the like are caused due to the change of pressure, and further the intense mixing action of the water phase and the oil phase is generated, so that the water phase components and the oil phase components can be violently collided to a certain extent, and more hole structures can be formed. And in order to reach stronger dispersion and erect the effect, carry out the low pressure through vacuum heating's effect again and heat the mixture, mix through homogenizing stirring and foaming emulsification respectively when low pressure heating, after the intensive mixing through above-mentioned two steps, at pressure boost to ordinary pressure condition, carry out efficient mixing through the change of pressure once more, have better heterogeneous hole structure moreover, can form a large amount of clearances and be used for holding other effective component.

In step 300, after adding a thickener and a preservative to the homogeneous emulsification, adding 10-20% of propylene glycol to fully mix, evaporating all impurities in the propylene glycol by a rotary evaporator under vacuum, adding a buffer solution to dilute the propylene glycol, dispersing until a milky white dispersion is formed, introducing nitrogen to remove residues in the propylene glycol, adding the buffer solution, and performing ultrasonic treatment and filter membrane filtration for later use.

Since the formulations of the present invention are oil-soluble, they can be mixed with the oil-and-fat material in advance by mixing them uniformly, and particularly, when propylene glycol is added as a lubricant and a solvent, the thorough mixing of the components can be further promoted.

Between the step 300 and the step 400, after the triethanolamine is added and the temperature is reduced, the mixed solution is heated to 60-80 ℃, and the temperature is maintained unchanged for 30-60 min until the alcohol solution in the mixed solution is evaporated, wherein the alcohol is added to promote the mixing and dissolution of the organic components, and after the function is completed, the organic components are completely evaporated by the evaporation effect.

In step 400, the mixing conditions and the mixing method thereof are specifically as follows: continuously cooling to 40 ℃, adjusting the pH value to 6.5-7.0, synchronously adding the mixture for later use, increasing the pressure of the mixture to 0.4-0.6 MPa, and continuously stirring until the mixture is completely dissolved in the mixture.

In step 400, since a large number of pores have been formed in the previous step, when the pressure is increased again, the effective molecules of various components will enter the pores to form a molecular structure in a wrapped state.

The preparation process is simple, easy to operate and low in technical requirement on equipment, and can be used for quickly carrying out batch production.

Based on the production process, the invention also provides a preparation device, which comprises a support base 1, wherein the warm-pressing reactor 2 is fixedly arranged in the support base 1, the top of the warm-pressing reactor 2 is provided with a water phase and oil phase premixing box 4 through a first feeding pipe 3, and the bottom of the water phase and oil phase premixing box 4 is connected with the warm-pressing reactor 2 through a second feeding pipe 5.

The support base 1 and the warm-pressing reactor 2 form an internal hollow structure, and in order to meet different types of premixing modes, the warm-pressing reactor 2 is provided with a water phase and oil phase premixing box 4 to meet the requirements. The temperature and pressure reactor 2 can reach the required vacuum degree to meet the technological conditions of the reaction, and a thermometer, a pH meter and a pH burette are arranged in the pressure stabilizing reactor through a column hole to detect corresponding data in the reaction process and feed back the detected data to realize the feedback regulation of the reaction conditions.

In the present embodiment, the water phase and oil phase premixing tank 4 is provided with a plurality of powder pipes independent of each other, and the ingredients can be sequentially fed into the reaction vessel in accordance with the actual formulation.

The water phase and the oil phase can be mixed in different stages in different mixing cavities in the pre-mixing box 4, and the mixing cavities can be independent from each other and do not affect each other during feeding. Synthesize above-mentioned, the effect that can play through setting up aqueous phase and oil phase premixing case 4 lies in can directly carrying out the premix and improving feeding efficiency outside, can also carry out selective feeding according to the stage of difference, and the feeding stage of difference does not influence each other, improves the practicality of its feeding.

The independent setting of the electrical heating piece in warm-pressing reactor 2, the heating efficiency of control warm-pressing reactor 2 that can be even, and can overcome prior art can influence the defect of heating homogeneity in the control heating efficiency, owing to be mutually independent in this embodiment, therefore, when control heating efficiency, reach the purpose of corresponding heating efficiency control through the quantity that evenly reduces or increase the electrical heating piece, and set up the water-cooling pipe between every electrical heating piece, the homogeneity of control cooling efficiency that also can be even and control its cooling in the same way.

In addition, the protective atmosphere is constructed in the invention to realize the protection of the preparation process and the protection after the preparation is finished. In the prior art, the filling is usually performed under the protection gas state at most, but in the actual operation, the operation in this way cannot play a good protection role per se, because the protection gas only provides a protection gas atmosphere in the prior art, and cannot play a role in sealing protection per se. In the embodiment, the protection effect can be achieved by sealing the whole nitrogen gas, so that the whole nitrogen gas is sealed, and the protection effect can be substantially achieved.

In order to verify the effect of the product, the following experiments are respectively carried out for testing, and the results are recorded as follows:

1) multiple skin secondary test results

1. The preparation method of the test substance comprises the following steps: the test was performed directly with the stock solution.

2. Test animals and breeding environment: the general grade white New Zealand seed coat is 4, the weight is 2.3-2.8kg provided by Shanghai Jiesi laboratory animal Co., Ltd, and the production license of the laboratory animal is as follows: SCXK (Shanghai) 2013 and 0006. The temperature of the experimental animal feeding room is 19-26 ℃ and the relative humidity is 40-70%. The Jiashan morning feed is provided with a certification number by Jiashan morning feed Limited liability company: zhe feeder (2014) 06017. License number for experimental animals: SYXK (Shanghai) 2017-0002.

The results obtained by the examination (approval test acceptance number: GT004201805804) by the disease prevention control center in Shanghai city are: in multiple skin irritation tests of the test substance on rabbits, the skin irritation reaction integral of each animal is 0 every day, and the test substance is non-irritant.

2) Results of skin phototoxicity test

According to the requirements of the technical Specification for cosmetic safety (2015 edition), the health safety detection (permission detection acceptance number: GT004201809421) is carried out on the samples to be detected through the detection of the disease prevention control center in Shanghai, and the result is that the diethylamino hydroxybenzoyl hexyl benzoate meets the requirements of the technical Specification for cosmetic safety (2015 edition).

And the results obtained by the microbial detection and the sanitary chemical detection (approval test acceptance number: GT004201805804), respectively, were:

and (3) detecting microorganisms: the total number of bacterial colonies, mould fungi, saccharomycetes, heat-resistant coliform bacteria, staphylococcus aureus and pseudomonas aeruginosa all meet the requirements of technical safety standards of cosmetics (2015 edition).

And (3) sanitary chemical detection: 15 sunscreen components such as lead, mercury, cadmium, arsenic, phenyl benzimidazole sulfonic acid and the like meet the requirements of technical standards for cosmetic safety (2015 edition).

Toxicology testing for safety evaluation: under the unit experiment condition, the skin irritation test for a plurality of times is non-irritant, the skin allergy test result is that no skin allergy is seen, and the skin phototoxicity test result is that no skin phototoxicity is seen.

3) Skin allergy test

2. Test animals and breeding environment: the general grade of the england automized guinea pigs were divided into three groups, test subject test group and positive test group, 20 subjects per group, and 10 subject control groups. The weight of 221-: the temperature of the SCXK (Shanghai) 2016-0005 experimental animal feeding room is 19-26 ℃, and the relative humidity is 40-70%. Guinea pig feed was provided by charitable morning feed llc under the following certification numbers: zhe feeder (2014) 06017. License number for experimental animals: SYXK (Shanghai) 2013 and 0008.

3. The test method comprises the following steps: the guinea pigs were shaved on the left side of the back 24h prior to the trial and had an area of approximately 6 square centimetres. And (3) induction contact: 0.2ml of the test substance for induction was applied to the skin of the area of 2cm x 2cm shaved on the left side of the test substance experimental animals, covered with two layers of gauze and a layer of cellophane, fixed with adhesive tape, and closed for 6 h. The same procedure is repeated for 7d and 14 d. The positive test group was treated with 0.4% 2, 4-dinitrochloropropiophenone solution, and the test control group was treated with the same solvent. And (3) exciting contact: at 14 days after the last induction, the right side of the animals in the test and control groups, which had been hairy 2cm x 2cm before 24h, was coated with the test substance 0.2m1, covered with two layers of gauze, one layer of cellophane, and fixed and sealed with adhesive tape for 6h, and the positive test group was exposed to the same challenge with 0.2% 2, 4-dinitrochloropropiophenone solution. Skin reactions were observed 24 and 48 hours after challenge, and skin reaction scores and sensitization intensity ratings were performed according to the regulations of the technical safety of cosmetics (2015 edition) (chapter six).

Conclusion from the above method tests: as a result of an experiment on skin allergy of a guinea pig by a test substance, 0 case of animals with the total erythema edema score of more than or equal to 2 was obtained, the sensitization rate was 0, and no skin allergy was observed.

4) Patch test on human skin

Materials and methods:

1. the test substance: cosmetic end products.

2. Negative control: blank control.

3. Subject: the total number of 30 persons, 2 men and 28 women, the age of 21-55 years, meets the volunteer selection criteria of the subject.

4. The spot test method comprises the following steps: selecting qualified spot tester, applying 0.03ml of test substance into the spot tester by a closed spot test method, applying a special adhesive tape on the back of the test subject, removing the test substance after 24 hours, observing skin reaction at 0.5, 24 and 48 hours after removal, and recording the result according to the skin reaction grading standard in technical Specification for cosmetic safety (2015 edition).

The test results of the cosmetics evaluation center of the Huaxi hospital, Sichuan university: adverse cutaneous reactions occurred in 0 of 30 people.

According to the test results, the product is proved to be non-toxic and not to cause allergic reaction to the skin.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims

1. The sun-screen lotion for mildly repairing and brightening skin is characterized by comprising the following raw materials in parts by weight:

2. The sun block for mildly repairing and brightening skin according to claim 1, wherein the multi-component sun block is prepared from the following raw materials in parts by weight:

3. The sun block for mildly repairing and brightening skin according to claim 1, wherein the moisturizing agent is prepared from the following raw materials in parts by weight: 2-8% of glycerol, 2-8% of propylene glycol and 0.5-1% of 1, 2-hexanediol;

4. The sun block for mildly repairing and brightening skin according to claim 1, wherein the emulsifier is composed of the following raw materials in parts by weight: 1-5% of potassium cetyl phosphate and 0.5-2% of sodium stearyl glutamate;

the aromatic consists of 0.1-0.5% of essence in parts by weight.

5. A process for the preparation of a sun screen according to any one of claims 1 to 4, comprising the steps of:

6. The method for preparing a mild-care skin-lightening sunscreen lotion according to claim 5, wherein in step 100, the water component is heated under vacuum by the following specific steps:

7. The method for preparing a mild-care skin-lightening sunscreen lotion according to claim 5, wherein the specific steps of mixing and homogenizing the oil phase component and the water phase component in step 300 are as follows:

8. The method of claim 5, wherein the step 300 comprises adding 10-20% propylene glycol after homogenizing, mixing thoroughly, removing all impurities in propylene glycol by vacuum evaporation with a rotary evaporator, adding buffer solution to dilute propylene glycol, dispersing until a milky white dispersion is formed, introducing nitrogen to remove residues in propylene glycol, adding buffer solution, and filtering with ultrasonic wave and filter membrane.

9. The method for preparing a mild repairing skin-lightening sunscreen lotion according to claim 8, wherein between step 300 and step 400, after adding triethanolamine at a reduced temperature, the mixed solution is heated to 60-80 ℃ and the temperature is maintained for 30-60 min until the alcohol solution in the mixed solution is evaporated.

10. The method for preparing a mild-care skin-lightening sunscreen lotion according to claim 9, wherein in step 400, the mixing conditions and the mixing method thereof are as follows: and continuously cooling to 40 ℃, adjusting the pH value to 6.5-7.0, synchronously adding the standby solution, increasing the pressure of the mixture to 0.4-0.6 MPa, and continuously stirring until the standby solution is completely dissolved in the mixture.