CN115192478A - High-stability water-in-oil type physical sun block and preparation method thereof - Google Patents

Abstract

The invention discloses a water-in-oil physical sun-block emulsion with high stability and a preparation method thereof, wherein the water-in-oil physical sun-block emulsion comprises 3-5.5% of a first emulsion stabilizer, 1-2% of an emulsifier, 0.4-0.8% of a thickener, 0.8-1.2% of a film-forming agent, 19-26% of a sun-block agent, 41-54% of an emollient, 0.1-0.3% of a second emulsion stabilizer, a solvent and the balance by weight percentage; the first emulsion stabilizer comprises dextrin palmitate, and a cyclopentadimethylsiloxane/polydimethylsiloxane crosspolymer. According to the invention, the stability of the water-in-oil type pure physical sun block is well improved by adding a proper amount of dextrin palmitate and utilizing the structural characteristics of the dextrin palmitate. The invention also adopts cyclopenta dimethyl silicone polymer/dimethyl silicone polymer cross-linked polymer as an emulsification stabilizer, which can form a certain network structure in the oil phase and has certain assistance to the stability of the whole system.

Description

High-stability water-in-oil type physical sun block and preparation method thereof

Technical Field

The invention relates to the technical field of daily chemical articles, in particular to a water-in-oil type physical sun block with high stability and a preparation method thereof.

Background

In recent years, sunscreen products have grown rapidly, and more consumers are aware that photoaging causes greater damage to the skin. Ultraviolet rays are an important factor causing skin aging and melanin production. Without a basic sunscreen treatment, even if other skin care products claiming to have sunscreen efficacy are applied, the sunscreen efficacy is also of little effect.

Most of the water-in-oil sunscreen systems on the market are shaking systems (shaking before use). The great reason for developing such a system is that: high power water-in-oil sunscreen systems contain high levels of sunscreen agents (both chemical and physical), requiring a large fraction of the oil to be used to solubilize and disperse the sunscreen agents. Compared with other skin care products, the oil phase proportion of the water-in-oil type sunscreen product is very high, and most of oil in the product is polar oil or low-viscosity silicone oil, so that great challenge is brought to the stability of a formula, the product is easy to layer, the material body cannot be kept in a uniform state for a long time, and the oil is separated out. Therefore, water-in-oil sunscreen products on the market are generally made into a shaking system, the water-in-oil sunscreen products need to be shaken before use, the water-in-oil sunscreen products after shaking can be placed for a period of time without layering, but generally can only be maintained for about 3 days, the material is uniform within 3 days, the appearance is not changed, and the using effect is not influenced. However, if the time is long, the material body can generate a layering phenomenon, and the use is influenced.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention aims to provide the water-in-oil physical sun block with high stability.

The invention also aims to provide a preparation method of the water-in-oil type physical sun block with high stability, which has simple process and easily controlled quality.

One of the purposes of the invention is realized by adopting the following technical scheme:

a water-in-oil physical sun-block emulsion with high stability comprises an oil phase and a water phase, wherein the oil phase comprises 3-5.5% of a first emulsion stabilizer, 1-2% of an emulsifier, 0.4-0.8% of a thickener, 0.8-1.2% of a film-forming agent, 19-26% of a sun-block agent and 41-54% of an emollient agent according to the weight percentage in the sun-block emulsion; the water phase comprises 0.1-0.3% of second emulsion stabilizer, solvent and the balance; the first emulsion stabilizer comprises dextrin palmitate, and a cyclopentadimethylsiloxane/polydimethylsiloxane crosspolymer.

According to the invention, a proper amount of dextrin palmitate is added, and the stability of the water-in-oil type pure physical sun block is well improved by utilizing the structural characteristics of the dextrin palmitate. Cyclodextrin palmitate is a high-molecular oil-soluble thickener with high polymerization degree, and its structure is shown in figure 1 (A represents long-chain alkane). The cyclodextrin palmitate is added into the system, the long-chain alkane can form a paste thickening system, and hydrogen bonds are formed among residual hydroxyl groups in dextrin in grease (as shown in figure 2). Therefore, the dextrin palmitate can well form a grid structure in the oil phase to support the oil phase, so that the stability of the whole system is remarkably improved. And dextrin palmitate is taken as an emulsion stabilizer and is also a thickening stabilizer, oil-soluble soft gel is formed by thickening oil, and hard gel is formed by thickening oil phase thickener, so that the spreadability and the spreadability of the product are greatly improved.

In addition, the invention also adopts cyclopenta dimethyl silicone polymer/dimethyl silicone polymer cross-linked polymer as an emulsion stabilizer, which is a cross-linked polymer and can form a certain network structure in an oil phase, thereby assisting the stability of the whole system. Cyclopenta dimethyl silicone polymer/dimethyl silicone cross-linked polymer is also a filling agent, is smooth, fresh and non-greasy, is beneficial to smearing of the product, can control oil and cover wrinkles, and absorbs grease.

In a preferred embodiment of the invention, the oil phase further comprises 1-3% of a filler; the aqueous phase further comprises one or any combination of the following: 0.01-0.03% of chelating agent, 0.02-0.05% of skin conditioner, 0.05-0.2% of surfactant and 0.05-0.2% of preservative. The surfactant can reduce the surface tension of the water phase and further enhance the emulsion stability of the system.

In a preferred embodiment of the present invention, in the oil phase, the emulsifier comprises one or any combination selected from the group consisting of: PEG-10 polydimethylsiloxane, cetyl PEG/PPG-10/1 polydimethylsiloxane, and lauryl PEG-9 Dimethylsiloxyethyl polydimethylsiloxane. More preferably, the emulsifier is a combination of PEG-10 polydimethylsiloxane, cetyl PEG/PPG-10/1 polydimethylsiloxane and lauryl PEG-9 polydimethylsiloxane ethyl polydimethylsiloxane, and the 3 emulsifiers are matched to ensure that the product is uniformly dispersed and has stable property.

In a preferred embodiment of the invention, the thickener comprises disteardimonium hectorite in the oil phase, which can enhance the emulsion stability of the system.

In a preferred embodiment of the present invention, in the oil phase, the film former comprises an acrylic/polydimethylsiloxane copolymer. More preferably, the film forming agent is a composite formed by cyclopentadimethylsiloxane and acrylic acid (ester)/polydimethylsiloxane copolymer.

In a preferred embodiment of the invention, the sunscreen agent comprises titanium dioxide, silica and zinc oxide in the oil phase. More preferably, the sunscreen comprises a first composite sunscreen that is a complex of titanium dioxide, silica and polydimethylsiloxane and a second composite sunscreen that is a complex of zinc oxide, silica, aluminum distearate and polydimethylsiloxane. The sunscreen provided by the invention is a pure physical sunscreen, and the sunscreen can be fully dispersed in the sunscreen system, so that ultraviolet rays can be better shielded and protected, and the performance of the physical sunscreen can be fully exerted. Wherein, the aluminum distearate can make the viscosity of the sun-screening agent proper and also prevent powder agglomeration.

In a preferred embodiment of the present invention, in the oil phase, the emollient is selected from one or any combination of ethylhexyl palmitate, dimethiconol, dimethicone, isododecane, cyclohexasiloxane and cyclopentadimethicone.

In a preferred embodiment of the invention, the filler comprises polymethylsilsesquioxane in the oil phase. The polymethylsilsesquioxane can enhance the ductility and smoothness of the sun block, improve the touch feeling and prevent the sun block from caking.

In a preferred embodiment of the invention, the second emulsion stabilizer comprises sodium chloride in the aqueous phase.

In a preferred embodiment of the present invention, in the aqueous phase, the solvent is water.

In a preferred embodiment of the invention, the chelating agent comprises disodium EDTA in the aqueous phase.

In a preferred embodiment of the present invention, in said aqueous phase, said skin conditioning agent comprises dipotassium glycyrrhizinate.

In a preferred embodiment of the invention, in the aqueous phase, the surfactant comprises PEG/PPG-14/7 dimethyl ether. PEG/PPG-14/7 dimethyl ether can reduce the surface tension of an aqueous phase in the formula, and can further enhance the emulsion stability of the system. While PEG/PPG-14/7 dimethyl ether is generally used only as a humectant in other products, it has been found by the present invention that the addition of it to a system enhances the emulsion stability of the system.

In a preferred embodiment of the invention, in the aqueous phase, the preservative comprises phenoxyethanol.

In a preferred embodiment of the invention, the high-stability water-in-oil physical sun-block emulsion comprises an oil phase and an aqueous phase, wherein the oil phase comprises 3-5.5% of a first emulsion stabilizer, 1-2% of an emulsifier, 0.4-0.8% of a thickener, 0.8-1.2% of a film forming agent, 19-26% of a sun-block agent, 1-3% of a filler and 41-54% of an emollient; the water phase comprises 0.1-0.3% of second emulsion stabilizer, 0.01-0.03% of chelating agent, 0.02-0.05% of skin conditioner, 0.05-0.2% of surfactant, 0.05-0.2% of preservative, solvent and the balance;

the first emulsion stabilizer comprises dextrin palmitate, and a cyclopentadimethylsiloxane/polydimethylsiloxane crosspolymer; the emulsifier comprises PEG-10 polydimethylsiloxane, cetyl PEG/PPG-10/1 polydimethylsiloxane and lauryl PEG-9 polydimethylsiloxyethyl polydimethylsiloxane; the second emulsion stabilizer comprises sodium chloride; the surfactant comprises PEG/PPG-14/7 dimethyl ether.

In a preferred embodiment of the present invention, the high-stability water-in-oil physical sunscreen emulsion comprises an oil phase and a water phase, wherein the oil phase comprises, in terms of weight percentage in the sunscreen emulsion:

first emulsion stabilizer: 1-1.5% of dextrin palmitate and 2-4% of cyclopentadimethylsiloxane/polydimethylsiloxane cross-linked polymer;

emulsifier: 0.5-0.8% of PEG-10 polydimethylsiloxane, 0.3-0.6% of cetyl PEG/PPG-10/1 polydimethylsiloxane, 0.3-0.6% of lauryl PEG-9 polydimethylsiloxane;

thickening agent: 0.4 to 0.8 percent of disteardimonium hectorite,

Film forming agent: 0.8-1.2% of compound formed by cyclopentadimethylsiloxane and acrylic acid (ester)/polydimethylsiloxane copolymer,

Sunscreen agents: 12-16% of a complex formed by titanium dioxide, silica and polydimethylsiloxane, and 7-10% of a complex formed by zinc oxide, silica, aluminum distearate and polydimethylsiloxane;

filling agent: 1-3% of polymethylsilsesquioxane;

and (3) an emollient: 6-10% of ethylhexyl palmitate, 0.3-0.6% of a compound of polydimethylsiloxane alcohol and polydimethylsiloxane, and 5-8% of isododecane; 30-35% of a compound of cyclohexasiloxane and cyclopentasiloxane;

the aqueous phase comprises:

second emulsion stabilizer: 0.1 to 0.3 percent of sodium chloride,

chelating agent: 0.01 to 0.03 percent of EDTA disodium,

skin conditioner: 0.02 to 0.05 percent of dipotassium glycyrrhizinate,

surfactant (b): 0.05 to 0.2 percent of PEG/PPG-14/7 dimethyl ether,

preservative: 0.05 to 0.2 percent of phenoxyethanol,

solvent and the balance.

The second purpose of the invention is realized by adopting the following technical scheme:

a preparation method of the water-in-oil type physical sun block with high stability as one of the purposes comprises the following steps:

dividing the emollient in the oil phase raw material into two parts, namely a first part of emollient and a second part of emollient; adding the rest oil phase raw materials except the emollient and the first part of emollient into an emulsifying pot, stirring and heating, homogenizing to completely disperse the materials, and keeping the temperature for later use;

adding the second part of the emollient into an emulsifying pot, stirring uniformly, and keeping the temperature for later use;

adding the water phase raw materials into a water phase pot, stirring and heating, then starting the emulsifying pot to stir, pumping the mixed water phase raw materials into the emulsifying pot while stirring, and cooling after complete encapsulation and emulsification;

cooling, if the formula comprises antiseptic, adding antiseptic into the emulsifying pan, and stirring.

In a preferred embodiment of the invention, the preparation method of the water-in-oil physical sun block with high stability provided by the invention comprises the following steps:

dividing the emollient in the oil phase raw material into two parts, namely a first part of emollient and a second part of emollient; adding the rest oil phase raw materials except emollient and the first part of emollient into emulsifying pot, stirring and heating to 80-85 deg.C, homogenizing at 2000-2500R/min for 5-8min to completely disperse the materials, and keeping the temperature for use. The operation of this step is critical because the sunscreen lotion formulation of the present invention contains a large amount of powder (zinc oxide, titanium dioxide, silica), and this step requires sufficient wetting and dispersion of the powder, and dispersion of the agglomerated powder, so that the final product can better shield and protect against uv light, and fully exert the performance of the physical sunscreen agent.

Adding the second part of the emollient into an emulsifying pot, stirring uniformly, and keeping the temperature for later use;

adding the water phase raw materials into a water phase pot, stirring and heating to 80-85 ℃, then starting the emulsifying pot to stir, slowly pumping the mixed water phase raw materials into the emulsifying pot while stirring, slowly wrapping and emulsifying completely, and then cooling;

cooling to 40-45 deg.C, adding antiseptic into the emulsifying pan, and stirring to obtain the final product

Compared with the prior art, the invention has the beneficial effects that:

(1) According to the high-stability water-in-oil type physical sun block provided by the invention, the stability of the water-in-oil type pure physical sun block is well improved by adding a proper amount of dextrin palmitate and utilizing the structural characteristics of the dextrin palmitate; and the cyclopentadecanedimethylsiloxane/polydimethylsiloxane cross-linked polymer is used as an emulsion stabilizer, which can form a certain network structure in an oil phase, and has certain assistance to the stability of the whole system, so that the stability of the system is further enhanced, and the system is not layered after being placed for a long time and grease is not separated out.

(2) The preparation method of the water-in-oil type physical sun block with high stability, provided by the invention, has the advantages of simple process and easily controlled quality.

Drawings

FIG. 1 is a molecular structure diagram of cyclodextrin palmitate;

fig. 2 is a diagram showing the structure of the network formed by cyclodextrin palmitate.

FIG. 3 is a display diagram showing that the water-in-oil physical sun block provided by the embodiment 2 of the invention is stable after standing for 9 months;

FIG. 4 is a graph showing the unstable oil precipitation of the product after the sample of comparative example 1 of the present invention is left for 1 week;

FIG. 5 is a graph showing the unstable oil precipitation of the product after the sample of comparative example 2 of the present invention is left for 2 weeks;

FIG. 6 is a graph showing the unstable oil precipitation of the product after the sample of comparative example 3 of the present invention is left for 2 weeks.

Detailed Description

The present invention is further described with reference to the accompanying drawings and the detailed description, and it should be noted that, in the case of no conflict, any combination between the embodiments or technical features described below may form a new embodiment.

The raw materials, equipments and the like used in the following examples are commercially available unless otherwise specified. For example, the raw material No. 2 can be purchased from Guangzhou positive chemical company Limited, and the product name is SIL ZP-45 powdery silicone gel elastomer, which can be used for facilitating the sunscreen emulsion to form a breathable film, effectively improving the color and the water resistance and durability of the sunscreen agent, and having strong adhesive force.

The No. 7 raw material can be selected from Guangzhou san Kaiser chemical technology limited company, is not greasy, has outstanding smoothness such as silk hand feeling and matte effect, plays a role in tackifying and has excellent thixotropy.

The No. 8 raw material can be selected from Sakory and trade company Limited in Guangzhou, has excellent stability, and can thoroughly ensure that the nanoparticles are free from agglomeration and keep the particle size stable through an inorganic surface treatment technology, thereby ensuring the sun-proof efficacy. It is a full physical sunscreen agent, has no irritation even if directly applied on skin, and is suitable for sensitive skin.

Feedstock No. 9 may be selected from products of sakojiri limited, guangzhou.

The No. 12 raw material can be selected from Guangzhou Rongdao chemical industry Co., ltd, and is smooth and light.

The No. 14 raw material can be selected from Guangzhou Rongdao chemical company, is fresh, non-greasy, soft, easy to spread and non-irritating.

Examples 1 to 3

A water-in-oil physical sun block with high stability comprises an oil phase raw material and a water phase raw material, wherein the oil phase raw material comprises: a first emulsion stabilizer, an emulsifier, a thickener, a film former, a sunscreen agent, a filler, and an emollient; the water phase raw materials comprise: a second emulsion stabilizer, a chelating agent, a skin conditioner, a surfactant, a preservative, and a solvent. The specific formulation is detailed in table 1 below.

Table 1 formulations of examples 1-3

The high-stability water-in-oil type physical sunscreen emulsions of examples 1-3 were prepared as follows:

cleaning, disinfecting and emulsifying equipment for later use;

adding No. 1-12 oil phase raw materials into an emulsifying pot, stirring and heating to 83 ℃, homogenizing at the speed of 2300R/min for 7min to completely disperse the materials, and keeping the temperature for later use;

adding the No. 13 and No. 14 raw materials into an emulsifying pot, uniformly stirring, and keeping the temperature for later use;

adding No. 15-19 water phase raw materials into a water phase pot, stirring and heating to 83 ℃, starting the emulsifying pot to stir, slowly pumping the mixed water phase raw materials into the emulsifying pot while stirring, slowly wrapping and emulsifying completely, and then cooling;

cooling to about 43 deg.C, adding No. 20 raw materials into emulsifying pan, and stirring.

Comparative example 1

Comparative example 1 differs from example 2 in that: the procedure of example 2 was repeated except that the dextrin palmitate as the starting material No. 1 was omitted and the amount of the cyclopentadimethylsiloxane/polydimethylsiloxane crosspolymer as the starting material No. 2 was adjusted to 4.2%.

Comparative example 2

Comparative example 2 differs from example 2 in that: the procedure of example 2 was repeated except that the cyclopentadimethylsiloxane/polydimethylsiloxane crosspolymer as the starting material No. 2 was omitted and the amount of dextrin palmitate as the starting material No. 1 was adjusted to 4.2%.

Comparative example 3

Comparative example 3 differs from example 2 in that: the procedure of example 2 was repeated except that the PEG/PPG-14/7 dimethyl ether used as the raw material No. 18 was omitted and the amount of water used as the raw material No. 19 was adjusted to 20.95%.

Comparative example 4

Comparative example 4 differs from example 2 in that: the procedure of example 2 was repeated except that the cetyl PEG/PPG-10/1 polydimethylsiloxane as the raw material No. 4 was omitted and the lauryl PEG-9 dimethiconoethyl polydimethylsiloxane as the raw material No. 5 was used in an amount of 0.85%.

Comparative example 5

Comparative example 5 differs from example 2 in that: the number 10 material polymethylsilsesquioxane is omitted, and the dosage of the number 2 material cyclopentasiloxane/polydimethylsiloxane cross-linked polymer is adjusted to 5%.

Performance testing

1. Stability test

After the sunscreen emulsion samples of examples 1-3 and comparative examples 1-5 were obtained, stability tests were performed, respectively. And (5) placing the sample indoors for a corresponding time at normal temperature, and observing whether the sample has the phenomena of layering, precipitation and the like. If the appearance phenomenon is inconsistent with that before the test, the stability of the sunscreen emulsion sample is poor, the sunscreen emulsion sample does not pass the stability test and is marked as X; otherwise, the sun-screening milk sample is proved to be strong in stability and can pass the stability test and is marked as V. The test results are shown in table 2 below.

Table 2 stability test results recording table

Standing for 1 week

Standing for 2 weeks

Standing for 1 month

Standing for 3 months

Standing for 6 months

Standing for 9 months

Example 1

√

√

√

√

√

√

Example 2

√

√

√

√

√

√

Example 3

√

√

√

√

√

√

Comparative example 1

√

×

×

×

×

×

Comparative example 2

√

√

×

×

×

×

Comparative example 3

√

√

×

×

×

×

Comparative example 4

√

×

×

×

×

×

Comparative example 5

√

√

√

×

×

×

As can be seen from the records in table 2, the sunscreen emulsions of examples 1 to 3 have very good stability, and can still maintain stability after being placed at room temperature for 9 months, the sunscreen emulsions do not delaminate, precipitate, and separate out grease, and the sunscreen emulsion sample of example 1 can still maintain stability after being placed for 9 months, as shown in fig. 3; the graphs of the results of examples 2-3 are similar to those of example 1 and are not repeated here. Whereas the water-in-oil purely physical sunscreen systems (shaking-shaking systems) currently available on the market generally retain stability for only a few days.

Comparative example 1 the thickener dextrin palmitate was omitted, which greatly reduced the stability of the sunscreen and an instability occurred after 2 weeks, see figure 4, with oil separation. Comparative example 2 the omission of the cyclopentadimethylsiloxane/polydimethylsiloxane crosspolymer, which was synergistic with dextrin palmitate to enhance the stability of the system, and the omission of one of them, all resulted in a reduction in the stability of the system. Comparative example 2 is shown unstably in figure 5.

Comparative example 3 omits PEG/PPG-14/7 dimethyl ether, and the surface activity of the aqueous phase cannot be modified to reduce, so that the stability of the system is reduced, as shown in FIG. 6.

The emulsifier formula in the comparative example 4 is changed, so that the stability of the system is reduced, the invention adopts PEG-10 polydimethylsiloxane, cetyl PEG/PPG-10/1 polydimethylsiloxane and lauryl PEG-9 polydimethylsiloxane ethyl polydimethylsiloxane as the emulsifier combination, so that the sun-screening emulsion system can obtain better stability, and the emulsifier combination can well emulsify grease and disperse the sun-screening agent.

Comparative example 5 the polymethylsilsesquioxane was omitted and the amount of cyclopentadimethylsiloxane/polydimethylsiloxane crosspolymer was increased, which also affected the stability of the system.

The embodiment of the invention adopts the raw materials such as proper emulsion stabilizer, emulsifier, surfactant, thickener and the like to carry out compounding, and reasonably controls the dosage of each raw material, so that the water-in-oil type physical sun-screening emulsion can keep long-term stability, and the stability is far higher than that of the existing products of the same series on the market.

2. Usage sensing test

15 testers with healthy facial skin and the age of 20-25 years are selected, and the sunscreen emulsion samples of the examples 1-3 and the comparative examples 1-5 are tried one by 15 testers. Before trial, the test persons all underwent the same skin cleansing procedure. After the trial, the trial personnel score the product, the score is 0-10, the higher the score is, the better the spreadability and spreadability of the product are, the better the use feeling is, the higher the acceptance degree is, and the score is the average value of 15 trial personnel. And the overall evaluation was recorded.

TABLE 3 evaluation record table of effects of foundation solutions of examples 1 to 3 and comparative examples 1 to 6

Classification of	Example 1	Example 2	Example 3	Comparative example 1	Comparative example 2	Comparison ofExample 3	Comparative example 4	Comparative example 5
									Feeling of use score	9.1	9.3	8.8	5.4	7.0	8.5	7.1	6.3

From the record in table 3, the test subjects scored higher on the sunscreens of examples 1-3, and the overall reaction product of the test subjects was very spreadable, easily spreadable, fresh and non-greasy. While comparative examples 1-5 all scored relatively low, the test subjects reacted the product with less spreadability than the example samples, relatively poor extensibility, and lower acceptance. In the embodiment of the invention, dextrin palmitate is used as an emulsion stabilizer and is also a thickening stabilizer, and the dextrin palmitate is thickened to form an oil-soluble soft gel, so that the spreadability and the spreadability of the product can be greatly improved. The polymethylsilsesquioxane can also enhance the extensibility and smoothness of the sunscreen emulsion and improve the touch feeling.

The above embodiments are only preferred embodiments of the present invention, and the scope of the present invention should not be limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are intended to be covered by the claims.

Claims (10)

1. The water-in-oil physical sun block with high stability is characterized by comprising an oil phase and a water phase, wherein the oil phase comprises 3-5.5% of a first emulsion stabilizer, 1-2% of an emulsifier, 0.4-0.8% of a thickener, 0.8-1.2% of a film forming agent, 19-26% of a sun block and 41-54% of an emollient by weight percentage in the sun block; the water phase comprises 0.1-0.3% of second emulsion stabilizer, solvent and the balance; the first emulsion stabilizer comprises dextrin palmitate, and a cyclopentadimethylsiloxane/polydimethylsiloxane crosspolymer.

2. The high-stability water-in-oil physical sun block according to claim 1, wherein the oil phase further comprises 1-3% of a filler; the aqueous phase further comprises one or any combination of the following: 0.01-0.03% of chelating agent, 0.02-0.05% of skin conditioner, 0.05-0.2% of surfactant and 0.05-0.2% of preservative.

3. The high-stability water-in-oil physical sun block according to claim 2, wherein in the oil phase, the emulsifier comprises one or any combination of the following components: PEG-10 dimethicone, cetyl PEG/PPG-10/1 dimethicone, and lauryl PEG-9 dimethicone ethyl dimethicone;

the thickener comprises disteardimonium hectorite;

the film-forming agent comprises acrylic acid (ester)/polydimethylsiloxane copolymer;

the sunscreen agent comprises titanium dioxide, silica and zinc oxide;

the emollient is selected from one or any combination of ethylhexyl palmitate, dimethiconol, polydimethylsiloxane, isododecane, cyclohexasiloxane and cyclopentadimethylsiloxane;

the filler comprises polymethylsilsesquioxane.

4. The high-stability water-in-oil physical sun block according to claim 3, wherein the film forming agent is a compound formed by cyclopentadimethylsiloxane and acrylic/polydimethylsiloxane copolymer; the sunscreen agent comprises a first compound sunscreen agent and a second compound sunscreen agent, wherein the first compound sunscreen agent is a compound formed by titanium dioxide, silica and polydimethylsiloxane, and the second compound sunscreen agent is a compound formed by zinc oxide, silica, aluminum distearate and polydimethylsiloxane.

5. The high-stability water-in-oil physical sun block according to claim 2, wherein the second emulsion stabilizer comprises sodium chloride; the solvent is water; the chelating agent comprises disodium EDTA; the skin conditioner comprises dipotassium glycyrrhizinate; the surfactant comprises PEG/PPG-14/7 dimethyl ether; the preservative comprises phenoxyethanol.

6. The high-stability water-in-oil physical sun block according to claim 1, which comprises an oil phase and an aqueous phase, wherein the oil phase comprises 3-5.5% of a first emulsion stabilizer, 1-2% of an emulsifier, 0.4-0.8% of a thickener, 0.8-1.2% of a film forming agent, 19-26% of a sun block, 1-3% of a filler and 41-54% of an emollient; the water phase comprises 0.1-0.3% of second emulsion stabilizer, 0.01-0.03% of chelating agent, 0.02-0.05% of skin conditioner, 0.05-0.2% of surfactant, 0.05-0.2% of preservative, solvent and the balance;

the first emulsion stabilizer comprises dextrin palmitate, and a cyclopentadimethylsiloxane/polydimethylsiloxane crosspolymer; the emulsifier comprises PEG-10 polydimethylsiloxane, cetyl PEG/PPG-10/1 polydimethylsiloxane and lauryl PEG-9 polydimethylsiloxyethyl polydimethylsiloxane; the second emulsion stabilizer comprises sodium chloride; the surfactant comprises PEG/PPG-14/7 dimethyl ether.

7. The high stability water-in-oil physical sun block according to claim 1, comprising an oil phase and an aqueous phase, wherein the oil phase comprises, in weight percent in the sun block:

first emulsion stabilizer: 1-1.5% of dextrin palmitate and 2-4% of cyclopentadimethylsiloxane/polydimethylsiloxane cross-linked polymer;

emulsifier: 0.5-0.8% of PEG-10 polydimethylsiloxane, 0.3-0.6% of cetyl PEG/PPG-10/1 polydimethylsiloxane, 0.3-0.6% of lauryl PEG-9 polydimethylsiloxane;

thickening agent: 0.4 to 0.8 percent of disteardimonium hectorite,

Film-forming agent: 0.8-1.2% of compound formed by cyclopentadimethylsiloxane and acrylic acid (ester)/polydimethylsiloxane copolymer,

Sunscreen agents: 12-16% of a complex formed by titanium dioxide, silica and polydimethylsiloxane, and 7-10% of a complex formed by zinc oxide, silica, aluminum distearate and polydimethylsiloxane;

filling agent: 1-3% of polymethylsilsesquioxane;

and (3) an emollient: 6-10% of ethylhexyl palmitate, 0.3-0.6% of a compound of polydimethylsiloxane alcohol and polydimethylsiloxane, and 5-8% of isododecane; 30-35% of a compound of cyclohexasiloxane and cyclopentasiloxane;

the aqueous phase comprises:

second emulsion stabilizer: 0.1 to 0.3 percent of sodium chloride,

chelating agent: 0.01 to 0.03 percent of EDTA disodium,

skin conditioner: 0.02 to 0.05 percent of dipotassium glycyrrhizinate,

surfactant (B): 0.05 to 0.2 percent of PEG/PPG-14/7 dimethyl ether,

preservative: 0.05 to 0.2 percent of phenoxyethanol,

solvent and the balance.

8. The high-stability water-in-oil physical sun block according to claim 1, comprising an oil phase and a water phase, wherein the oil phase comprises, in weight percent in the sun block:

first emulsion stabilizer: dextrin palmitate 1.2%, cyclopenta dimethyl silicone/dimethyl silicone cross-linked polymer 3%;

emulsifier: PEG-10 polydimethylsiloxane 0.6%, cetyl PEG/PPG-10/1 polydimethylsiloxane 0.4%, lauryl PEG-9 polydimethylsiloxyethyl polydimethylsiloxane 0.45%;

thickening agent: 0.6 percent of disteardimonium hectorite,

Film-forming agent: 1 percent of compound formed by cyclopentadimethylsiloxane and acrylic acid (ester)/polydimethylsiloxane copolymer,

Sunscreen agent: 14% of a complex formed by titanium dioxide, silica and polydimethylsiloxane, 8.5% of a complex formed by zinc oxide, silica, aluminum distearate and polydimethylsiloxane;

filling agent: 2% of polymethylsilsesquioxane;

and (3) an emollient: 8% of ethylhexyl palmitate, 0.45% of a compound of dimethicone alcohol and dimethicone, 6.5% of isododecane; 32% of a complex of cyclohexasiloxane and cyclopentasiloxane;

the aqueous phase comprises:

a second emulsion stabilizer: 0.2 percent of sodium chloride,

chelating agent: 0.02 percent of EDTA disodium salt,

skin conditioner: 0.03 percent of dipotassium glycyrrhizinate,

surfactant (b): 0.1 percent of PEG/PPG-14/7 dimethyl ether,

preservative: 0.1 percent of phenoxyethanol,

solvent and the balance.

9. A process for the preparation of a high stability water-in-oil physical sun block according to any of claims 1 to 8, comprising the steps of:

dividing the emollient in the oil phase raw material into two parts, namely a first part of emollient and a second part of emollient; adding the rest oil phase raw materials except the emollient and the first part of emollient into an emulsifying pot, stirring and heating, homogenizing to completely disperse the materials, and keeping the temperature for later use;

adding the second part of the emollient into an emulsifying pot, stirring uniformly, and keeping the temperature for later use;

adding the water phase raw materials into a water phase pot, stirring and heating, then starting stirring the emulsifying pot, pumping the mixed water phase raw materials into the emulsifying pot while stirring, wrapping and emulsifying completely, and then cooling;

cooling, if the formula comprises antiseptic, adding antiseptic into the emulsifying pan, and stirring.

10. The method for preparing a water-in-oil type physical sun block with high stability according to claim 9, comprising the steps of:

dividing the emollient in the oil phase raw material into two parts, namely a first part of emollient and a second part of emollient; adding the rest oil phase raw materials except for emollient and the first part of emollient into an emulsifying pot, stirring and heating to 80-85 deg.C, homogenizing at 2000-2500R/min for 5-8min to completely disperse the materials, and keeping the temperature for later use;

adding the second part of the emollient into an emulsifying pot, stirring uniformly, and keeping the temperature for later use;

adding the water phase raw materials into a water phase pot, stirring and heating to 80-85 ℃, then starting the emulsifying pot to stir, slowly pumping the mixed water phase raw materials into the emulsifying pot while stirring, slowly wrapping and emulsifying completely, and then cooling;

cooling to 40-45 deg.C, adding antiseptic into the emulsifying pan, and stirring.

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