CN107149562B

CN107149562B - Foundation premix capable of changing color from deep to light, foundation composition and preparation method of foundation composition

Info

Publication number: CN107149562B
Application number: CN201710299977.1A
Authority: CN
Inventors: 蒲科; 亢荣敏
Original assignee: Shanghai Sciencoo Biotech Co ltd
Current assignee: Shanghai Co-fun Biotech Co.,Ltd.
Priority date: 2017-05-02
Filing date: 2017-05-02
Publication date: 2020-06-23
Anticipated expiration: 2037-05-02
Also published as: CN107149562A

Abstract

The invention relates to a foundation premix changing color from deep to light, a foundation composition and a preparation method thereof. The powder premix comprises titanium dioxide and inorganic pigment, wherein the titanium dioxide is used (C)_n'H_2n'+1)_aSi(OC_mH_2m+1)_4‑a(n 'is an integer and n' is not less than 1, m is 1 or 2, a is an integer and 3 is not less than a not less than 1) carrying out surface treatment; the inorganic pigment comprises (C)_pH_2p+1)_bSi(OC_qH_2q+1)_4‑b(p is an integer and is more than or equal to 1, q is 1 or 2, b is an integer and is more than or equal to 3 and is more than or equal to 1) and polydimethylsiloxane (n is an integer and is more than or equal to 1). The present invention also relates to a preparation method comprising the premix and a foundation composition comprising the premix. The foundation composition has the advantages of controllable and quick color change effect, high wettability, strong covering power, various colors, safety, harmlessness, simple production process and the like.

Description

Foundation premix capable of changing color from deep to light, foundation composition and preparation method of foundation composition

Technical Field

The invention relates to the field of cosmetics, in particular to a foundation premix changing color from deep to light, a foundation composition containing the foundation premix and a preparation method of the foundation premix and the foundation composition.

Background

Foundations such as foundation creams/liquids are a very important class of cosmetics and also the basis for achieving good cosmetic results. Cosmetic manufacturers typically provide foundations of different colors (e.g., dark skin color, light skin color), etc., depending on the shade of the user's skin color. The appearance color of the common foundation cream is basically consistent with the actual use color.

In order to create a novel visual effect and to achieve the purpose of attracting consumers, a novel color-changing foundation has emerged in recent years. Discoloration is usually the conversion of a paste from a light color (e.g., off-white, white) to a darker color (e.g., dark skin color, light skin color) during application; or from a dark color (e.g., dark skin color, light skin color) to a light color (off-white, white); or from one color (e.g., light yellow) to another (e.g., dark red). The color-changing foundation not only can cover fine wrinkles or flaws of skin with common foundation, but also has obvious color-changing effect, is very novel, and is very suitable for creating market concepts and attracting the eyes of consumers.

Currently, there are three types of color-changing foundations on the market.

The first is a cellulose binding technique. This technique uses cellulose as a binder to bind ultrafine titanium dioxide to the surface of an inorganic pigment (usually yellow iron oxide, red iron oxide, black iron oxide, etc.) used in a cosmetic foundation. The preparation method is very close to the folk traditional food: the sweet dumpling (takes stuffing as a core and wet glutinous rice flour adhered on the surface). When the color-changing foundation is used, titanium dioxide adhered to the surface of the pigment is separated under the action of shearing force by smearing with fingers, the color of the pigment is shown, and the foundation achieves a process of changing from white (or grey white) to skin color (see figure 1).

The second technique is color-changing pearl powder technique. The technology achieves the color changing effect through the refraction and scattering of the pearl powder to light. When in use, the pearl powder emulsified and wrapped in the paste is coated on the surface of the skin and exposed to the irradiation of light, thereby showing the change of color.

A third technique is to use an acid-base indicator. The technology utilizes several pH indicators, and the pH indicator can be prepared according to the principle that the color changes under the condition of the change of the external pH value (pH value). In use, the pH indicator contacts the skin (usually at a slightly acidic pH) and changes color, thereby producing a color change effect.

However, the three techniques of color changing foundations have significant drawbacks in practical use.

The drawbacks of the cellulose binding technology include the following aspects:

(1) the covering power is weak. The particle size (particle size) and shape of inorganic pigments are generally stable (e.g., red iron oxide, which is generally spherical and generally has a particle size of 0.3 to 0.5 um; black iron oxide, which is generally cubic and generally has a particle size of about 0.3 um), and the particle size of titanium dioxide is as small as possible (typically, nano-titanium dioxide) in order to achieve good adhesion and encapsulation; in addition, in order to achieve the rapid and obvious color change effect, the amount of titanium dioxide adhered to the surface of the inorganic pigment cannot be too much, and an adhered layer cannot be too thick. It is difficult to achieve good hiding power.

(2) The color change speed is slow. When the foundation is used, a smearing and moving process is provided, the iron oxide particles wrapped by titanium dioxide are broken under the action of shearing force, and the original iron oxide wrapped inside is exposed to generate a color changing effect. The rate of color change depends on the magnitude of the external force, the speed of application, and the degree of firmness of the bonded particles. The slow and soft smearing is not beneficial to the breaking of the particles and the display of the color-changing effect. However, as a cosmetic for facial use, foundation cream/lotion is rarely applied repeatedly and rapidly with force when used, which affects the color change speed and the color change effect of the product.

(3) The production process is difficult to master. The firmness of the cellulose bond is a contradiction: the bonding firmness is too high, and the color change effect is difficult to occur when the foundation cream/liquid is used; the bonding firmness is too low, the particles are broken in the production and filling processes of the foundation cream/liquid, and the inorganic pigment is displayed early. Therefore, in actual production, cellulose-bonded color-changing foundations have high requirements for the production process: the stirring paddle can not scrape the wall; the powder needs to be soaked in advance according to strict time and temperature; the emulsification time and temperature must be strictly controlled … product quality is difficult to control

The defects of the color-changing pearl powder technology comprise the following aspects:

(1) the color change effect is not obvious. Before smearing, the color-changing pearl powder is hidden in the paste body, does not contact with light, and cannot see the color effect of the pearl powder; after being applied, the pearl powder is coated on the surface of the skin and exposed to light to develop color. This is the principle of this color change technique. However, the color developing effect of pearl powder is much weaker than that of iron oxide. The foundation cream has the main functions of covering flaws and adjusting skin color; in this regard, the pearl essence is not satisfactory.

(2) The shiny effect of pearlescent powder is deemed unsuitable for use on the whole face. The pearl powder has a shining pearl effect naturally, and is more suitable for being used on parts such as eye shadow, lip gloss and the like in the cosmetic process; foundation is used for the whole face as a base of makeup. The entire face, if shiny, is obviously unnatural.

The drawbacks of using acid-base indicators include the following:

(1) only the color change effect is achieved, but the foundation product should not be achieved. There is only one process of color change. The function of covering flaws and adjusting skin color cannot be achieved.

(2) Is not harmful to human body. The commonly used acid-base indicators are mainly: nitrophenols, phenolphthalein, sulfophenolphthalein and azo compounds. Basically belongs to weak organic acids or weak organic bases. Most of these agents are not on the list of cosmetic raw materials and are not allowed to be used in cosmetics.

In order to overcome the technical problems of the prior art, the present applicant has proposed a powder premix for a color-changing foundation composition comprising titanium dioxide and an inorganic pigment, characterized in that: the titanium dioxide is subjected to triethoxymethyl silanization surface treatment; the inorganic pigment is subjected to triethoxyoctylsilanization surface treatment; the inorganic pigment comprises iron oxide yellow, iron oxide red and iron oxide black. However, although the foundation solution/foundation cream provided by the application has smooth skin feel, is breathable and refreshing, the moisture is not enough, and particularly, the foundation solution/foundation cream needs to be matched with other skin care products for use in autumn and winter. In addition, in the technical scheme of the application, the color change effect is not ideal all the time, and especially the color change effect is difficult to control, namely, the distribution state (dispersity) of titanium dioxide and inorganic pigment (ferric oxide) in siloxane needs to be controlled at certain specific points to produce relatively stable and controllable color change effect. From the experimental results, if the iron oxide is treated with triethoxymethylsilane alone, the color-changing effect of the final foundation composition is not always desirable, and the color-changing effect is difficult to control. That is, to obtain a stable and controllable discoloration effect, it is necessary to control the distribution (dispersibility) of titanium dioxide and an inorganic pigment (e.g., iron oxide) in silicone to certain specific points. Furthermore, the present inventors found through experiments that triethoxycaprylylsilane-treated titanium dioxide, triethoxymethylsilane and polydimethylsiloxane-treated iron oxide are the most desirable for the darkening type color foundation composition.

Disclosure of Invention

The invention aims to solve one or more of the defects of the prior art from the technical source and provide a color-changing foundation composition which has controllable and quick color-changing effect, high wettability, strong covering power, various colors, safety, harmlessness and simple production process and a preparation method thereof.

The present invention provides, in a first aspect, a powder premix for a foundation composition that changes color from deep to light. The premix comprises titanium dioxide which has been surface-treated with a first alkyl siloxane and an inorganic pigment. The inorganic pigment is subjected to surface treatment by using a composite treating agent containing a second alkyl siloxane and polydimethylsiloxane.

The first alkylsiloxane has the structure shown in formula (A):

(C_n'H_2n'+1)_aSi(OC_mH_2m+1)_4-a(A)

in formula (A), n 'is an integer and n' ≧ 1, for example n 'can be 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 14, 16, 18, 20, 22 or 24, etc., preferably n' ≧ 8, for example an integer between 8 and 24, preferably an integer between 8 and 18, m is 1 or 2, a is an integer and 3 ≧ a ≧ 1, for example a is 1, 2 or 3.

The present invention provides in a second aspect a process for the preparation of a premix according to the first aspect of the invention, which process comprises:

s11: uniformly mixing the first alkyl siloxane and ethanol to prepare a first surface treatment liquid;

s12: spraying the first surface treatment liquid into titanium dioxide while stirring to uniformly mix the first surface treatment liquid and the titanium dioxide, thereby preparing a first powder;

s13: drying the first powder, and naturally cooling to room temperature to obtain titanium dioxide subjected to surface treatment;

s21, uniformly mixing the second alkyl siloxane, the polydimethylsiloxane and the ethanol to prepare a second surface treatment liquid;

s22: spraying the second surface treatment liquid into the inorganic pigment while stirring to uniformly mix the second surface treatment liquid and the inorganic pigment, thereby preparing a second powder material;

s23: drying the second powder and naturally cooling to room temperature to obtain the inorganic pigment subjected to surface treatment;

s33: mixing the surface-treated titanium dioxide and the surface-treated inorganic pigment to prepare the premix.

In a third aspect, the present invention provides a deep-to-light colour changing foundation composition comprising a premix according to the first aspect of the present invention or a premix obtainable by the process of the second aspect.

The present invention artificially manufactures and enlarges the surface property difference between titanium dioxide and an inorganic pigment (iron oxide) by a specific surface treatment method. The titanium dioxide and the inorganic pigment are in different distribution states in the whole emulsification system by utilizing the specific formula composition, thereby achieving the controllable color change effect. The specific beneficial effects comprise the following points:

(1) the color change effect is quick. When lightly applied to the skin, the skin immediately changes from dark (or light) to pale (or white).

(2) The covering power is strong. The color-changing foundation of the invention has no limit on the particle size, has no great limit on the addition amount in the formula, and can achieve very good covering power.

(3) The color is rich and various, and the depth is adjustable. The color changing foundation treated by the method has no great limit on the addition amount of the iron oxide in the formula, and the foundation with different colors can be prepared by adjusting the proportion of yellow, red and black of the iron oxide.

(4) And (4) safety. The color-changing foundation treated by the method does not contain an acid-base indicator and does not harm the skin. The surface treatment method is applied to cosmetics for many years, and is safe and non-toxic.

(5) The production process is simple. The production process is simple and controllable, and the material body is resistant to shearing, extrusion and vibration. Is suitable for cosmetic manufacturers to produce and transport.

(6) The degree of wetting is good, and there is no dry or dry feel after application.

Drawings

FIG. 1 is a schematic diagram of a prior art cellulose binding technique.

FIG. 2 is a reaction process diagram of the surface treatment of titanium dioxide of the present invention;

FIG. 3 is a surface chemical diagram of the powder of the titanium dioxide of the present invention after surface treatment;

FIG. 4 is a reaction process diagram of the surface treatment of the inorganic pigment of the present invention;

FIG. 5 is a diagram showing the surface chemistry of the inorganic pigment of the present invention after surface treatment.

Fig. 6 is a grayscale chart of a photograph showing the apparent color of # 5 color change cream.

Fig. 7 is a grayscale image of a photograph showing the color change effect of the 5# color change cream.

Fig. 8 is a grayscale image of a photograph showing the apparent color of # 1 color change cream.

Fig. 9 is a grayscale image of a photograph showing the color change effect of the # 1 color change cream.

Detailed Description

As described above, the present invention provides, in a first aspect, a powder premix for a foundation composition that changes color from dark to light. The premix comprises titanium dioxide which has been surface-treated with a first alkyl siloxane and an inorganic pigment. The inorganic pigment is subjected to surface treatment by using a composite treating agent containing a second alkyl siloxane and polydimethylsiloxane.

The first alkylsiloxane has the structure shown in formula (A):

(C_n'H_2n'+1)_aSi(OC_mH_2m+1)_4-a(A)

In a specific embodiment, the first alkyl siloxane has the structure shown in formula (a), and n' ═ 8, a ═ 1, and m ═ 2, i.e., the alkyl siloxane is triethoxyoctyl silane.

The second alkylsiloxane has the structure shown in formula (B):

(C_pH_2p+1)_bSi(OC_qH_2q+1)_4-b(B)

in formula (B), p is an integer and p.gtoreq.1, for example, may be 1, 2, 3, 4, 5, 6 or 7, preferably p < 8, for example, an integer between 1 and 7, more preferably an integer between 1 and 6, further preferably an integer between 1 and 5, still further preferably an integer between 1 and 4, for example, p is 1, 2 or 3, or p is 1 or 2, or p is 1. q is 1 or 2, b is an integer and 3. gtoreq.b.gtoreq.1, for example b may be 1, 2 or 3.

In some preferred embodiments, n '-p.gtoreq.3, more preferably n' -p.gtoreq.4, still more preferably n '-p.gtoreq.7, e.g., n' is 8 and p is 1. The inventors have found that in some of these preferred embodiments, the resulting color-changing vanishing cream has excellent wettability.

In a specific embodiment, the second alkyl siloxane is triethoxymethylsilane.

The structure of the polydimethylsiloxane is shown as the following formula (C):

in the formula (C), n is an integer and n is not less than 1. Preferably, the polydimethylsiloxane is such that its entire molecule is encapsulated on the inorganic pigment with no excess portions in favor of the inorganic pigment particles. In some embodiments, n in formula (C) may be an integer between 1 and 10, for example, may be 1, 2, 3, 4, 5, 6, 7, 8, 9, or 10.

In some embodiments, the first alkylsiloxane is treated at a concentration of 0.5 to 5 mass%, such as 0.5, 1, 2, 3, 4, or 5 mass%, more preferably 2 to 3 mass%, based on the mass of the titanium dioxide.

In some embodiments, the second alkylsiloxane is present at a treatment concentration of 0.5 to 5 mass%, for example 0.5, 1, 2, 3, 4 or 5 mass%, more preferably 1 to 2 mass%, based on the mass of the inorganic pigment.

In some embodiments, the treatment concentration of the polydimethylsiloxane is 3 to 10 mass%, such as 3, 4, 5, 6, 7, 8, 9, or 10 mass%, more preferably 4 to 6 mass%, based on the mass of the inorganic pigment.

In some embodiments, the surface of the titanium dioxide after surface treatment is coated with C_n' alkyl-encapsulated (see figure 3); the surface of the inorganic pigment after surface treatment is coated with Si-O straight chain and-CH₃Both groups of branches are encapsulated (see figure 5).

In some embodiments, the content of the titanium dioxide after surface treatment is 75 to 95 mass%, for example 75, 80, 85, 90 or 95 mass%, based on the total mass of the premix; the content of the inorganic pigment after surface treatment is 5 to 25 mass%, for example, 5, 10, 15, 20, or 25 mass%.

In some embodiments, the inorganic pigment in the premix is selected from the group consisting of yellow iron oxide, red iron oxide, and black iron oxide, which have been surface-treated as described above. For example, the inorganic pigment is any one of yellow iron oxide, red iron oxide and black iron oxide, or a mixture of any two of them, or a mixture of all three of them, which has been subjected to surface treatment as described above. In some preferred embodiments, the inorganic pigments contained in the premix consist of the following inorganic pigments, based on the total mass of the premix: 3.75 mass% of iron oxide yellow subjected to surface treatment with the composite treating agent; 1.80 mass% of iron oxide red subjected to surface treatment with the composite treatment agent; and 0.45 mass% of iron oxide black subjected to surface treatment with the composite treating agent.

In some embodiments, the first alkyl siloxane is triethoxycaprylylsilane; the second alkyl siloxane contained in the composite treating agent is triethoxymethylsilane; and/or the polydimethylsiloxane has a structure represented by the formula (C) and n is an integer of 1 to 8.

In some specific embodiments, the first alkyl siloxane is triethoxycaprylylsilane; in step S11, 0.45kg of triethoxyoctylsilane was uniformly mixed with 1.05kg of 95 vol% ethanol (95%) to prepare the first surface treatment liquid; in step 12, 15kg of titanium dioxide is added into a stirrer and stirred, and the first surface treatment solution is sprayed into the stirrer and sufficiently stirred so as to uniformly mix the first surface treatment solution and the titanium dioxide, thereby preparing a first powder material; in step 13, the first powder was baked in an oven at 105 ℃ for 4 hours and naturally cooled to room temperature, thereby obtaining surface-treated titanium dioxide. The second alkyl siloxane is triethoxymethylsilane, and the polydimethylsiloxane is a structure shown in a formula (C) with n being 5; and in step S21, 0.15kg of triethoxymethylsilane, 0.6kg of the polydimethylsiloxane, and 2.05kg of a 95 vol% aqueous ethanol solution were uniformly mixed to prepare a second surface treatment liquid; in step S22, 15kg of iron oxide is added to a stirrer and stirred, and the second surface treatment solution is sprayed into the stirrer and stirred sufficiently to mix the second surface reaction solution and the iron oxide uniformly, thereby preparing a second powder material; in step S23, the second powder is placed in an oven and baked at 70 to 105 ℃ for 4 hours and naturally cooled to room temperature, thereby obtaining surface-treated iron oxide.

The surface treatment of titanium dioxide using the first alkyl siloxane is described by taking triethoxyoctylsilane as the first alkyl siloxane as an example. The reaction process is shown in fig. 2, which comprises two steps: the first step is a triethoxyoctylsilane hydrolysis step; the second step is a step of condensation dehydration of silanol and hydroxyl on the surface of carbon dioxide powder. After the surface treatment, the surface chemistry of the carbon dioxide powder is shown in fig. 3, and the surface of the titanium dioxide powder is coated by C8 alkyl chain.

The surface treatment of iron oxide using the first alkylsiloxane and polydimethylsiloxane is described by taking triethoxymethylsilane as the second alkylsiloxane and iron oxide as the inorganic pigment. The reaction process is as followsFig. 4 shows, which includes two steps: the first step is a triethoxymethylsilane hydrolysis step; the second step is a condensation dehydration step of silanol and hydroxyl on the surface of the powder. After the surface treatment, the surface chemistry of the iron oxide powder is as shown in fig. 5, and the polydimethylsiloxane represented by the formula (C) is uniformly coated on the surface of the powder particles in a physical adsorption manner, so that the surface of the iron oxide powder is coated with the Si-O straight chain and the-CH straight chain after the surface treatment₃Two groups of branched chains are wrapped.

It can be seen that the surface properties of the inorganic pigment and titanium dioxide, which have been subjected to the above-mentioned different surface treatments with titanium dioxide and an inorganic pigment such as iron oxide, respectively, have a relatively large difference, and the silicon atom on the surface of titanium dioxide is followed by an octyl group having eight carbon atoms. Because of the carbon chain length, there is good dispersibility in aliphatic greases, while compatibility in silicones is relatively poor. The surface of iron oxide has a silicon atom followed by a methyl group of carbon atoms and a cross-linked polymer of siloxane, so that there is better compatibility in siloxane. The surface properties of the two powders are significantly different due to the completely different surface treatment methods adopted for titanium dioxide and inorganic pigments such as iron oxide.

In a third aspect, the present invention provides a deep-to-light colour changing foundation composition comprising a premix according to the first aspect of the present invention or a premix obtainable by the process of the second aspect. The form of the foundation composition of the present invention is not particularly limited, and it may be a foundation cream or a foundation liquid. In some embodiments, the foundation composition further comprises emulsifiers, emollients, preservatives and fragrances; preferably, the emollient is a silane emollient.

The present invention will be further illustrated in the following examples, which are provided for illustrative purposes only and are not intended to limit the scope of the present invention.

Example 1

Surface treatment of titanium dioxide

Titanium dioxide was surface-treated with triethoxyoctylsilane (i.e., an alkylsiloxane having the structure shown in formula (a) and n' ═ 8, a ═ 1, and m ═ 2) by the following method:

0.45kg of triethoxyoctylsilane and 1.05kg of ethanol (95 vol%) aqueous solution are uniformly mixed to prepare a first surface treatment liquid, and the first surface treatment liquid is ready to use.

Adding 15kg of titanium dioxide powder into a stirrer, and spraying the prepared surface treatment liquid into the stirrer through an oil spraying tank under high-speed stirring to be fully stirred so as to uniformly mix the first surface treatment liquid and the titanium dioxide to prepare first powder.

Discharging the first powder, immediately feeding the first powder into an oven, baking the first powder for 4 hours at 105 ℃, and naturally cooling and discharging the first powder.

Surface treatment of iron oxide black

The second surface treatment liquid was prepared by uniformly mixing 0.15kg of triethoxymethylsilane, 0.6kg of polydimethylsiloxane (n ═ 5), and 2.05kg of a 95 vol% aqueous ethanol solution.

Adding 15kg of iron oxide black into a stirrer for stirring, and spraying the prepared second surface treatment liquid into the stirrer through an oil spraying tank while stirring to be fully stirred so as to uniformly mix the second surface treatment liquid and the iron oxide black to prepare second powder.

And discharging the second powder, immediately feeding the second powder into an oven, baking the second powder for 4 hours at 105 ℃ (the baking temperature of the iron oxide yellow is 70 ℃), and naturally cooling and discharging the second powder to obtain the surface-treated iron oxide black serving as the inorganic pigment.

Surface treatment of iron oxide red

This is carried out in substantially the same manner as described above for the treatment of the iron oxide black, except that iron oxide red is used instead of the iron oxide black, thereby obtaining surface-treated iron oxide red as an inorganic pigment.

Surface treatment of iron oxide yellow

This was carried out in substantially the same manner as described above for the treatment of iron oxide black, except that iron oxide yellow was used instead of iron oxide black, and dried in an oven at 70 ℃ to obtain surface-treated iron oxide red as an inorganic pigment.

Example 2

Mixing 0.45kg of triethoxymethylsilane and 1.05kg of 95 vol% ethanol aqueous solution uniformly to prepare a first surface treatment solution, and using the first surface treatment solution;

adding 15kg of titanium dioxide into a stirrer, spraying the prepared first surface treatment liquid into the stirrer under stirring, and fully stirring to uniformly mix the first surface treatment liquid and the titanium dioxide to obtain first powder. And discharging the first powder, immediately feeding the first powder into an oven, baking the first powder for 4 hours at 105 ℃, naturally cooling the first powder to room temperature, and discharging the first powder to obtain the titanium dioxide treated by the triethoxymethylsilane.

Uniformly mixing 0.45kg of triethoxyoctylsilane and 1.05kg of 95 vol% ethanol water solution to prepare a second surface treatment solution, and using the second surface treatment solution after preparation; adding 15kg of inorganic pigment iron oxide into a stirrer, stirring, spraying the prepared second surface treatment liquid into the stirrer, and fully stirring to uniformly mix the second surface treatment liquid and the inorganic pigment to obtain second powder; discharging the second powder, immediately feeding into an oven, baking at 105 deg.C for 4 hr (if the inorganic pigment is yellow iron oxide, baking at 70 deg.C), naturally cooling to room temperature, and discharging.

Example 3

A color-changing foundation premix was prepared using the titanium dioxide, yellow iron oxide, black iron oxide and red iron oxide prepared in example 1 in the following proportions:

component name	CC603 proportion (%)	CC605 ratio (%)	CC807 mixing ratio％)	CC808 proportion (%)
					Titanium dioxide	94	94	94	94
Iron oxide yellow	3.75	3.55	3.90	4.00
					Iron oxide red	1.80	1.95	1.77	1.68
Iron oxide black	0.45	0.50	0.33	0.32

Example 4

A color-changing foundation premix was prepared from the titanium dioxide, yellow iron oxide, black iron oxide and red iron oxide prepared in example 2 in the following proportions:

examples 5 to 9 preparation of Foundation compositions that change color from dark to light (color-changing Foundation cream)

The color-changing vanishing creams of examples 5 to 9 were respectively prepared according to the compositions shown in the following table.

Among them, the color-changing foundation premixes used in examples 5 to 9 are shown in the following table:

examples	Example 5	Example 6	Example 7	Example 8	Example 9
						# color-changing cream	1# color-changing cream	2# color-changing cream	3# color-changing cream	Color-changing cream No. 4	5# color-changing cream
Premix compound	CC603	CC605	CC807	CC808	CC809

Preparation process (laboratory scale)

(1) Mixing and stirring the phase A, and homogenizing for 1 minute to completely and uniformly disperse the DC9040 silica gel elastomer.

(2) Heating phase A, controlling the temperature to be within the range of 55-60 ℃, adding phase B powder, and homogenizing for 1 minute to uniformly disperse the powder.

(3) Meanwhile, the C phase is heated, and the temperature is controlled to be about 55 to 60 ℃ so that the C phase is completely dissolved.

(4) Stirring the mixture of the phase A and the phase B obtained in the step (2), controlling the stirring speed at 200 revolutions per minute to 300 revolutions per minute, and slowly adding the completely dissolved phase C while stirring to completely emulsify.

(5) And (2) continuously stirring at normal temperature until the mixture is uniform, controlling the stirring speed to be 200-300 r/min, monitoring the temperature, controlling the temperature to be within the range of not more than 45 ℃, adding the phase D, continuously stirring until the color of the paste becomes stable (wherein the color of the paste of the examples 5-8 becomes dark skin color, and the color of the paste of the example 9 becomes grey white), and discharging to obtain the final color-changing foundation cream.

Comparison of color-changing Effect

The 1# color-changing cream and the 5# color-changing cream were coated on artificial skin to observe the color-changing effect after coating. The color-changing cream effect pair is as follows:

number of colour-changing cream	Foundation premix numbering	The external color of the color-changing cream	Color changing effect of color changing cream
				5# color-changing cream	CC809	See FIG. 6	See FIG. 7
1# color-changing cream	CC603	See FIG. 8	See FIG. 9

The color-changing foundation cream prepared from the color-changing foundation premix has the following color-changing effects: after being applied, the foundation cream is changed from dark color (such as dark skin color and light skin color) to light color (grey white color and white color), such as the color change effect of the No. 1 color change cream in the table.

The color-changing foundation cream prepared from the color-changing foundation premix CC809 has the color-changing effect that the foundation cream is changed from light color (such as grey white and white) to darker color (such as dark skin color and light skin color) after being applied, for example, the color-changing effect of the 5# color-changing cream in the table above.

Trial investigation

Through trial, the color-changing foundation cream obtained in the embodiments 10 to 15 of the invention has obvious color-changing effect, fast color change, strong covering power, easy smearing, uniform smearing, air permeability and easy absorption in the using process. 30 test persons (all female, age 20-40 years) are collected; and (3) trial time: 11 months in 2015; and (4) trial location: shanghai, Shenzhen and Beijing are 10 bits each; after use, the questionnaire is filled out. The results of the trial are summarized as follows:

the scoring criteria are as follows: the color change speed is graded from high to low by 5, 4, 3, 2 and 1; the covering power is graded from strong to weak by 5, 4, 3, 2 and 1; the skin feeling smoothness is 5, 4, 3, 2 and 1 from high to low; the air permeability is graded from strong to weak by 5, 4, 3, 2 and 1; the persistence degree is graded from strong to weak by 5, 4, 3, 2 and 1; the degree of wetting was scored from strong to weak 5, 4, 3, 2, 1. The purchase intention is to preferentially purchase two items from the six items.

Example 10

Titanium dioxide, yellow iron oxide, black iron oxide and red iron oxide were treated in substantially the same manner as in example 1 using the surface-treating agents shown in the following table, and a premix was prepared at the same formulation as CC603, and then a color-changing foundation cream was prepared at the same component formulation as in # 1 color-changing cream, and then the obtained color-changing foundation cream was scored at the same scoring criteria, and the average value (n-24) was calculated as follows:

examples	First alkyl siloxane	Second alkyl siloxane	Polydimethylsiloxane	Degree of wettability
					10	n'＝6，m＝1，a＝1	p＝1，q＝1，b＝1	n＝8	4.11
11	n'＝4，m＝1，a＝1	p＝1，q＝1，b＝1	n＝8	3.45
					12	n'＝2，m＝1，a＝1	p＝6，q＝1，b＝1	n＝8	2.47
13	n'＝1，m＝1，a＝1	p＝6，q＝1，b＝1	n＝8	2.34
					14	n'＝6，m＝2，a＝2	p＝1，q＝1，b＝2	n＝3	4.23
15	n'＝6，m＝2，a＝2	p＝3，q＝1，b＝1	n＝8	3.78
					16	n'＝6，m＝2，a＝2	p＝1，q＝2，b＝3	n＝8	4.10

As can be seen from the above results, when p is less than n 'or the difference of n' -p is less than or equal to 3, the degree of wetting is relatively significantly low. When the difference n' -p is greater than or equal to 4, the degree of wetting is relatively large. Therefore, it is preferable that n 'is greater than p and the difference of n' -p is greater than or equal to 4 to ensure the wettability of the color changing vanishing cream.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. A powder premix for a foundation composition changing color from deep to light, comprising titanium dioxide and an inorganic pigment, characterized in that:

the titanium dioxide is subjected to surface treatment by using first alkyl siloxane;

the inorganic pigment is subjected to surface treatment by using a composite treating agent containing second alkyl siloxane and polydimethylsiloxane;

wherein the first alkyl siloxane has the structure shown in the following formula (A):

(C_n'H_2n'+1)aSi(OC_mH_2m+1)_4-a(A)

in the formula (A), n 'is an integer, n' is not less than 1, m is 1 or 2, a is an integer, and 3 is not less than a not less than 1;

the second alkylsiloxane has the structure shown in formula (B):

(C_pH_2p+1)_bSi(OC_qH_2q+1)_4-b(B)

in formula (B), p is an integer and p is not less than 1, q is 1 or 2, B is an integer and 3 is not less than B not less than 1;

in the formula (C), n is an integer and n is not less than 1.

2. A premix according to claim 1 characterized in that:

in the formula (A), n' is not less than 8; the first alkylsiloxane having a treatment concentration of 0.5 to 5 mass% based on the mass of titanium dioxide; and/or

In formula (B), at p < 8; the second alkylsiloxane has a treatment concentration of 0.5 to 5 mass% based on the mass of the inorganic pigment; and/or

In formula (C), n is an integer between 1 and 10; the treatment concentration of the polydimethylsiloxane is 3 to 10 mass% in terms of the mass of the inorganic pigment.

3. A premix according to claim 1 characterized in that:

surface-treated surface coating C of the titanium dioxide_n'Alkyl groups are wrapped; the surface of the inorganic pigment after surface treatment is coated with Si-O straight chain and-CH₃The two groups of the branched chain are wrapped;

n'-p≥4。

4. a premix according to claim 1 characterized in that:

the content of the titanium dioxide after surface treatment is 75 to 95 mass% and the content of the inorganic pigment after surface treatment is 5 to 25 mass% based on the total mass of the premix.

5. A premix according to claim 1 characterized in that:

the inorganic pigment in the premix is selected from the group consisting of iron oxide yellow, iron oxide red and iron oxide black;

the inorganic pigment contained in the premix consists of the following inorganic pigments by mass: 3.75 mass% of iron oxide yellow subjected to surface treatment with the composite treating agent; 1.80 mass% of iron oxide red subjected to surface treatment with the composite treatment agent; and 0.45 mass% of iron oxide black subjected to surface treatment with the composite treating agent.

6. A premix according to claim 1 characterized in that:

the first alkyl siloxane is triethoxy octyl silane; and/or

The second alkyl siloxane contained in the composite treating agent is triethoxymethylsilane, which has a structure represented by the formula (C) above and n is an integer of 1 to 8.

7. A process for the preparation of a premix according to any of claims 1 to 6, characterized in that it comprises:

s21: uniformly mixing the second alkyl siloxane, the polydimethylsiloxane and ethanol to prepare a second surface treatment liquid;

8. The method of claim 7, wherein:

the first alkyl siloxane is triethoxy octyl silane; in step S11, 0.45kg of triethoxyoctylsilane was uniformly mixed with 1.05kg of 95 vol% ethanol (95%) to prepare the first surface treatment liquid; in step S12, 15kg of titanium dioxide was added to a stirrer and stirred, and the first surface treatment liquid was sprayed into the stirrer and sufficiently stirred to uniformly mix the first surface treatment liquid and titanium dioxide, thereby obtaining a first powder material; in step S13, the first powder is placed in an oven to be baked at 105 ℃ for 4 hours and naturally cooled to room temperature, thereby obtaining surface-treated titanium dioxide;

the second alkyl siloxane is triethoxymethylsilane, and the polydimethylsiloxane is a structure shown in a formula (C) with n being 5; and in step S21, 0.15kg of triethoxymethylsilane, 0.6kg of the polydimethylsiloxane, and 2.05kg of a 95 vol% aqueous ethanol solution were uniformly mixed to prepare a second surface treatment liquid; in step S22, 15kg of iron oxide is added to a stirrer and stirred, and the second surface treatment solution is sprayed into the stirrer and stirred sufficiently to mix the second surface reaction solution and the iron oxide uniformly, thereby preparing a second powder material; in step S23, the second powder is placed in an oven and baked at 70 to 105 ℃ for 4 hours and naturally cooled to room temperature, thereby obtaining surface-treated iron oxide.

9. A foundation composition changing color from deep to light, characterized in that:

the foundation composition comprising the premix according to any one of claims 1 to 7 or the premix produced by the process according to claim 7.

10. A foundation composition according to claim 9, wherein:

the foundation composition further comprises an emulsifier, an emollient, a preservative, and a fragrance; the emollient is a silane emollient.