Colorant homogenate, cosmetics, preparation method and application thereof

Abstract

The present application belongs to the field of cosmetic technology, and specifically relates to a colorant homogenate, cosmetics, and preparation methods and applications. The present application selects five components, including colorant, soybean lecithin with an HLB value of 3 to 5, acrylates / ethylhexyl acrylate / polydimethylsiloxane methacrylate copolymer, sorbitan stearate and other dispersing synergists, and base oil, and scientifically proportions them. With the help of the synergistic effect between the five components, a colorant homogenate is provided that can promote the uniform dispersion of the colorant in the base oil. Performance tests have shown that in the colorant homogenate of the present application, the average particle size D50 of the colorant is between 0.27 and 0.40 um, and the colorant span is between 0.67 and 1.45, which reflects a good dispersion effect.

Description

Technical Field

[0001] The present application belongs to the technical field of cosmetics, and specifically relates to a colorant homogenate, cosmetics, and a preparation method and application thereof. Background Art

[0002] Colorants play an important role in cosmetics, and can achieve multiple functions such as covering blemishes, even skin tone, and decorative embellishment. Through careful selection and blending, colorants can help cover spots, acne, dark circles, etc. on the skin, thereby creating a smoother and healthier skin texture; on the other hand, they can also perform skin modification to achieve physical whitening and even skin tone effects. In order to achieve better covering and modifying effects, the particle size of colorants is usually controlled at the micron level. Micron-level colorant particles are moderate in size, which can not only effectively cover skin blemishes and fill in the slight bumps on the skin surface, but also provide better visual effects. Through the scattering of light, the unevenness of the skin surface is reduced, making the skin look smoother and more delicate.

[0003] In the process of cosmetic preparation, colorant is one of the main raw materials, and its affinity with the basic solution of cosmetics will directly affect the quality of the coloring effect. Specifically, when the affinity of the colorant and the basic solution is poor, it is difficult for the colorant to be evenly dispersed inside the basic solution, which will not only affect the ductility of the colored cosmetics on the skin, but also may cause the colorant to appear stuck or uneven color distribution during use. At present, the basic solutions commonly used in cosmetics are oil components such as silicone oil, ester oils, alkanes, and vegetable oils. Common colorants are hydrophilic inorganic substances such as titanium dioxide. The lipophilic-hydrophilic properties between the two are quite different, making the dispersion of colorants in the basic solution a major problem. On this basis, compared with the nanoparticles used in sunscreen, the particle size of micron-sized colorants is larger, which means that during long-term storage, it is necessary to face more severe colorant aggregation and sedimentation problems, which will directly affect the concealer coating effect and ease of use of the colorant product. Therefore, in the field of cosmetic technology, how to solve the dispersion effect of hydrophilic micron-sized inorganic colorants in oils has become the core technology research and development direction of current coloring cosmetic products.

[0004] At present, in order to improve the dispersibility of colorants in the basic solution of cosmetics, a commonly used method is to surface treat the colorants, that is, to coat the colorants with silane coupling agents. This method utilizes the dual functionality in the molecular structure of the coupling agent. Specifically, its hydrophilic end can combine with the colorant, while the lipophilic end can interact with the basic solution. Through this dual-end functional design, the silane coupling agent can enhance the stable dispersion ability of the colorant in the oily medium. However, even if the surface treatment technology is used, if the types of dispersants and auxiliary agents are selected differently in actual operation, it may still directly affect the dispersion of the colorant, resulting in problems such as powder sticking and lack of fineness in the product. Summary of the invention

[0005] In order to solve the above technical problems, the present application provides a colorant homogenate with better colorant dispersion by selecting raw materials and scientifically proportioning the components, which is specifically achieved through the following technical solutions:

[0006] A colorant homogenate, calculated by mass percentage, comprising:

[0007] Colorant 20-38wt%;

[0008] Soy lecithin 0.1-1wt%;

[0009] Acrylates / ethylhexyl acrylate / polydimethylsiloxane methacrylate copolymer 0.2-1.5wt%;

[0010] Dispersion enhancer 0.2-1.8wt%;

[0011] Base oil 60-78wt%;

[0012] The HLB value of the soybean lecithin is 3-5; the dispersing synergist includes one or more of sorbitan stearate, sorbitan isostearate, sorbitan sesquiisostearate, sorbitan oleate and sorbitan sesquioleate.

[0013] The present application can promote the stable and uniform dispersion of the colorant in the base oil solvent through the synergistic effect between the colorant, soybean lecithin, acrylates / ethylhexyl acrylate / polydimethylsiloxane methacrylate copolymer, and the dispersion synergist, which is non-obvious. Specifically:

[0014] The soybean lecithin of the present application can adhere to the surface of the colorant to form wetting and exclude air from the surface of the colorant powder. Since soybean lecithin contains about 0.5% trace water, the adsorbed trace water will form a stable electrostatic double electron layer on the surface of the soybean lecithin and colorant mixed particles. The outermost layer of each mixed particle carries the same charge and forms a certain repulsive force. Therefore, when undergoing the stirring, dispersing and grinding preparation process, the mixed particles will be initially dispersed.

[0015] It should be pointed out that compared with lecithin, soybean lecithin has more C18 fatty acid chain structures, and the C18 structure itself has a certain degree of bendability, so it has a stronger bond with the colorant. Soybean lecithin has more hydroxyl structures at the hydrophilic end than lecithin, which is easier to form a double electron layer containing static electricity, and the repulsion between mixed particles is stronger, which reduces the adsorption between colorants and increases the long-term dispersion stability of colorants. In addition, the structure of soybean lecithin is similar to that of dispersing synergists such as sorbitan stearate, so the two can better cooperate to improve the dispersion effect of colorants in homogenate.

[0016] The acrylates / ethylhexyl acrylate / polydimethylsiloxane methacrylate copolymer of the present application can form steric hindrance between the mixed particles through interaction with the mixed particles, increase the span between the mixed particles, and avoid agglomeration and sedimentation of the mixed particles. More importantly, the present application can utilize the structural characteristics similar to the structure of soybean lecithin through sorbitan stearate, etc., and cooperate with the acrylates / ethylhexyl acrylate / polydimethylsiloxane methacrylate copolymer to promote the stable and uniform dispersion of the mixed particles in the base oil.

[0017] Preferably, the average particle size D50 of the colorant in the colorant homogenate is 0.27-0.36 um; the span of the colorant in the colorant homogenate is 0.67-0.98. It should be pointed out that in the present technical solution, the colorant in the colorant homogenate refers to particles in the form of colorant agglomerates in the colorant homogenate, and does not refer to the colorant powder, which is a powder raw material that is not dispersed in the base oil.

[0018] Preferably, calculated by mass percentage, the colorant slurry comprises: 28wt% titanium dioxide, 0.4wt% soybean lecithin with an HLB value of 4, 0.6wt% acrylates / ethylhexyl acrylate / polydimethylsiloxane methacrylate copolymer, 1wt% sorbitan sesquiisostearate, and 70wt% base oil.

[0019] Preferably, the colorant includes titanium dioxide and / or iron oxide, the base oil includes one or more of silicone oil, ester oil, alkane and vegetable oil; the colorant particle size is 0.1-0.8um. ​​The colorant particle size in this technical solution refers to the particle size of the colorant powder raw material.

[0020] Preferably, the added mass of soybean lecithin is 0.25-1.6% of the added mass of base oil, and is 1-3% of the added mass of colorant.

[0021] Preferably, the added mass of the acrylate / ethylhexyl acrylate / polydimethylsiloxane methacrylate copolymer is 0.4-1.5% of the added mass of the base oil, and is 1-3% of the added mass of the colorant.

[0022] Preferably, the added mass of the dispersing synergist is 0.3-2% of the sum of the added mass of the base oil and the colorant.

[0023] A method for preparing a colorant homogenate comprises the following steps:

[0024] S1. Mix the colorant and soybean lecithin to obtain mixed particles;

[0025] S2, sequentially adding mixed particles and a dispersing synergist to a mixture of acrylates / ethylhexyl acrylate / polydimethylsiloxane methacrylate copolymer and part of the base oil to obtain a preliminary dispersed slurry;

[0026] S3, grinding and dispersing the preliminary dispersed slurry using a three-roll mill to obtain a secondary dispersed slurry;

[0027] S4. Add the remaining base oil to the secondary dispersion slurry, disperse it using a three-roll mill, and then disperse it again using a high-speed homogenizer to obtain a colorant slurry.

[0028] The so-called partial base oil means that the amount of base oil added is greater than the wetting point of the powder and less than the flow point of the powder.

[0029] Use of a colorant slurry as described in any one of the above items in the preparation of cosmetics.

[0030] A cosmetic comprising any one of the above-mentioned colorant slurries.

[0031] Compared with the prior art, this application has the following beneficial effects:

[0032] The present application selects five components, namely, colorant, soybean lecithin with an HLB value of 3 to 5, acrylates / ethylhexyl acrylate / polydimethylsiloxane methacrylate copolymer, sorbitan stearate and other dispersing synergists and base oil, and scientifically proportions them. With the help of the synergistic effect between the five components, a colorant homogenate is provided that can promote the uniform dispersion of the colorant in the base oil. Performance tests have shown that in the colorant homogenate of the present application, the average particle size D50 of the colorant is between 0.27 and 0.40 um, and the colorant span is between 0.67 and 1.45, which reflects a good dispersion effect. On this basis, by adjusting the five components in the performance test, the average particle size D50 of the comparative example obtained is between 0.49 and 0.62 um, which is equivalent to 1.22 to 2.3 times that of the present application; the colorant span of the comparative example is between 2.6 and 3.1, which is equivalent to 1.79 to 4.63 times that of the present application. This reversely confirms that the five components of the present application are indispensable, and the components can effectively cooperate with each other to jointly promote the uniform dispersion of the colorant in the base oil. The colorant homogenate of the present application can be used to prepare cosmetics with concealer or modification functions, and has broad market potential and application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to clearly illustrate the embodiments, the following is a brief introduction to the accompanying drawings:

[0034] Figure 1 This is an optical microscope image of the colorant slurry disclosed in Example 1. DETAILED DESCRIPTION

[0035] The present application will be further described below in the form of specific embodiments. Those of ordinary skill in the art will be able to implement the present application based on these descriptions. In addition, the embodiments of the present application involved in the following description are generally only embodiments of a part of the present application, rather than all embodiments. Therefore, based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative work should fall within the scope of protection of the present application.

[0036] In the following embodiments, the preparation method of the colorant homogenate includes the following steps: S1, stirring the colorant and soybean lecithin evenly to obtain mixed particles; S2, adding the mixed particles and the dispersion synergist to the mixture of acrylates / ethylhexyl acrylate / polydimethylsiloxane methacrylate copolymer and part of the base oil in sequence to obtain a preliminary dispersion homogenate; the amount of the added part of the base oil needs to be greater than the wetting point of the powder and less than the flow point of the powder; S3, using a three-roll grinder to grind and disperse the preliminary dispersion homogenate to obtain a secondary dispersion homogenate; S4, adding the remaining base oil to the secondary dispersion homogenate, and using a high-speed homogenizer to disperse again to obtain a colorant homogenate. The preparation method of the cosmetics in the following embodiments is to add the remaining base oil in the above S4 while adding other components of the cosmetics, and use a high-speed homogenizer to disperse them together to obtain the cosmetics.

[0037] Example 1

[0038] This embodiment discloses a colorant homogenate, which includes, by weight percentage, 28wt% titanium dioxide colorant, 0.4wt% Yelkin SS soybean lecithin (HLB value is 4), 0.6wt% KP-578 acrylates / ethylhexyl acrylate / polydimethylsiloxane methacrylate copolymer, 1wt% sorbitan sesquiisostearate dispersing enhancer, and 70wt% silicone oil. In addition, this embodiment also discloses a cosmetic, which includes the above colorant homogenate.

[0039] Example 2

[0040] This embodiment discloses a colorant slurry, which includes, by weight percentage, 38wt% titanium dioxide colorant, 0.6wt% Yelkin SS soybean lecithin (HLB value is 4), 0.4wt% KP-578 acrylates / ethylhexyl acrylate / polydimethylsiloxane methacrylate copolymer, 1wt% sorbitan isostearate dispersing enhancer, and 60wt% silicone oil.

[0041] Example 3

[0042] This embodiment discloses a colorant slurry, which includes, by weight percentage, 20 wt% iron oxide colorant, 0.2 wt% Yelkin SS soybean lecithin (HLB value is 4), 0.6 wt% KP-578 acrylates / ethylhexyl acrylate / polydimethylsiloxane methacrylate copolymer, 1.2 wt% sorbitan stearate dispersing enhancer, and 78 wt% ester oil.

[0043] Example 4

[0044] This embodiment discloses a colorant slurry, which includes, by weight percentage, 28wt% titanium dioxide colorant, 0.4wt% Yelkin SS soybean lecithin (HLB value is 4), 0.6wt% KP-578 acrylates / ethylhexyl acrylate / polydimethylsiloxane methacrylate copolymer, 1.8wt% sorbitan oleate dispersing enhancer, and 69.2wt% isododecane.

[0045] Example 5

[0046] This embodiment discloses a colorant slurry, which includes, by weight percentage, 33.5 wt% titanium dioxide colorant, 1 wt% Yelkin SS soybean lecithin (HLB value is 4), 0.8 wt% KP-578 acrylates / ethylhexyl acrylate / polydimethylsiloxane methacrylate copolymer, 0.2 wt% sorbitan sesquiisostearate dispersing enhancer, and 64.5 wt% silicone oil.

[0047] Example 6

[0048] This embodiment discloses a colorant slurry, which includes, by weight percentage, 30wt% titanium dioxide colorant, 0.8wt% Yelkin SS soybean lecithin (HLB value is 4), 0.3wt% KP-578 acrylates / ethylhexyl acrylate / polydimethylsiloxane methacrylate copolymer, 1wt% sorbitan sesquiisostearate dispersing enhancer, and 67.9wt% silicone oil.

[0049] Example 7

[0050] This embodiment discloses a colorant slurry, which includes, by weight percentage, 20wt% titanium dioxide colorant, 0.1wt% Yelkin SS soybean lecithin (HLB value is 4), 1.5wt% KP-578 acrylates / ethylhexyl acrylate / polydimethylsiloxane methacrylate copolymer, 0.4wt% sorbitan sesquiisostearate dispersing enhancer, and 78wt% silicone oil.

[0051] Example 8

[0052] This embodiment discloses a colorant slurry, which includes, by weight percentage, 28wt% titanium dioxide colorant, 0.4wt% Yelkin SS soybean lecithin (HLB value is 4), 0.2wt% KP-578 acrylates / ethylhexyl acrylate / polydimethylsiloxane methacrylate copolymer, 1.4wt% sorbitan sesquiisostearate dispersing enhancer, and 70wt% silicone oil.

[0053] Comparative Example 1

[0054] This comparative example discloses a colorant homogenate, which differs from Example 1 in that soybean lecithin is not included. Specifically, calculated by mass percentage, the colorant homogenate of this comparative example includes 28wt% titanium dioxide colorant, 0.6wt% KP-578 acrylates / ethylhexyl acrylate / polydimethylsiloxane methacrylate copolymer, 1wt% sorbitan sesquiisostearate dispersing enhancer, and 70.4wt% silicone oil.

[0055] Comparative Example 2

[0056] This comparative example discloses a colorant homogenate, which differs from Example 1 in that soybean lecithin (product name ULTRALECP) with an HLB value of 7 is used. Specifically, calculated by mass percentage, the colorant homogenate includes 28wt% titanium dioxide colorant, 0.4wt% ULTRALECP soybean lecithin, 0.6wt% KP-578 acrylates / ethylhexyl acrylate / polydimethylsiloxane methacrylate copolymer, 1wt% sorbitan sesquiisostearate dispersing synergist, and 70wt% silicone oil.

[0057] Comparative Example 3

[0058] This comparative example discloses a colorant homogenate, which differs from Example 1 in that egg yolk lecithin is used instead of soybean lecithin. Specifically, calculated by mass percentage, the colorant homogenate includes 28wt% titanium dioxide colorant, 0.4wt% egg yolk lecithin PL-30S, 0.6wt% KP-578 acrylates / ethylhexyl acrylate / polydimethylsiloxane methacrylate copolymer, 1wt% sorbitan sesquiisostearate dispersing synergist, and 70wt% silicone oil.

[0059] Comparative Example 4

[0060] This comparative example discloses a colorant homogenate, which differs from Example 1 in that no acrylate / ethylhexyl acrylate / polydimethylsiloxane methacrylate copolymer is added. Specifically, calculated by mass percentage, the colorant homogenate includes 28wt% titanium dioxide colorant, 0.4wt% Yelkin SS soybean lecithin (HLB value 4), 1wt% sorbitan sesquiisostearate dispersing enhancer, and 70.6wt% silicone oil.

[0061] Comparative Example 5

[0062] This comparative example discloses a colorant homogenate, which differs from Example 1 in that DOWSIL TMFA4002ID Silicone Acrylate acrylic acid (ester) / polytrimethylsiloxane methacrylate copolymer replaces KP-578 acrylic acid ester / ethylhexyl acrylate / polydimethylsiloxane methacrylate copolymer. Specifically, calculated by mass percentage, the colorant slurry of this comparative example includes 28wt% titanium dioxide colorant, 0.4wt% Yelkin SS soybean lecithin (HLB value is 4), 0.6wt% DOWSIL TM FA 4002ID Silicone Acrylate acrylic acid (ester) type / polytrimethylsiloxane methacrylate copolymer, 1wt% sorbitan sesquiisostearate dispersing enhancer, and 70wt% silicone oil.

[0063] Comparative Example 6

[0064] This comparative example discloses a colorant slurry, which differs from Example 1 in that it does not contain the sorbitan sesquiisostearate dispersing synergist. Specifically, calculated by mass percentage, the colorant slurry includes 28wt% titanium dioxide colorant, 0.4wt% Yelkin SS soybean lecithin (HLB value 4), 0.6wt% KP-578 acrylates / ethylhexyl acrylate / polydimethylsiloxane methacrylate copolymer, and 71wt% silicone oil.

[0065] Comparative Example 7

[0066] This comparative example discloses a colorant homogenate, which differs from Example 1 in that CITHROLPG32IS polyglyceryl-3 diisostearate is used to replace sorbitan sesquiisostearate. Specifically, calculated by mass percentage, the colorant homogenate of this comparative example includes 28wt% titanium dioxide colorant, 0.4wt% Yelkin SS soybean lecithin (HLB value is 4), 0.6wt% KP-578 acrylates / ethylhexyl acrylate / polydimethylsiloxane methacrylate copolymer, 1wt% PG32IS polyglyceryl-3 diisostearate, and 70wt% silicone oil.

[0067] Performance Testing

[0068] The average particle size and span of the colorant in the colorant homogenate disclosed in Examples 1 to 8 and Comparative Examples 1 to 7 were tested using a Bettersize 2600 laser particle size analyzer, and the results are summarized as follows:

[0069] Table 1. Average particle size and span test table

[0070] D50 span Example 1 0.27um 0.67 Example 2 0.36um 0.98 Example 3 0.35um 1.06 Example 4 0.29um 0.85 Example 5 0.38um 1.11 Example 6 0.33um 0.95 Example 7 0.42um 1.45 Example 8 0.40um 1.24 Comparative Example 1 0.56um 3.10 Comparative Example 2 0.51um 2.92 Comparative Example 3 0.49um 2.60 Comparative Example 4 0.55um 2.99 Comparative Example 5 0.62um 3.10 Comparative Example 6 0.56um 2.75 Comparative Example 7 0.54um 2.88

[0071] In the above experimental data table, the average particle size D50 of the colorant in the colorant slurry prepared in Examples 1 to 8 is between 0.27 and 0.40 um, and the colorant span is between 0.67 and 1.45; in the comparative example, the relevant components are omitted by design or added or adjusted to components with similar functions, and the average particle size D50 of the colorant in the colorant slurry prepared in the comparative example is between 0.49 and 0.62 um, which is equivalent to 1.22 to 2.3 times that of the present application; the colorant span of the comparative example is between 2.6 and 3.1, which is equivalent to 1.79 to 4.63 times that of the present application, which in turn indicates that the five components of the present application can cooperate synergistically to promote the uniform dispersion of the colorant in the base oil in a smaller particle state.

[0072] By comparing Example 1 with Comparative Examples 1, 4 and 6, it can be found that whether or not any of soybean lecithin, acrylates / ethylhexyl acrylate / polydimethylsiloxane methacrylate copolymer and dispersion enhancer are added, the dispersion effect of the colorant will be affected. Specifically, in Comparative Example 1, soybean lecithin was not added, and the average particle size D50 of the colorant increased by 2.07 times compared with Example 1, and the colorant span increased by 4.63 times. In Comparative Example 4, acrylates / ethylhexyl acrylate / polydimethylsiloxane methacrylate copolymer was not added, and the average particle size D50 of the colorant increased by 2.04 times compared with Example 1, and the colorant span increased by 4.46 times. In Comparative Example 6, no dispersion enhancer was added, and the average particle size D50 of the colorant increased by 2.07 times compared with Example 1, and the colorant span increased by 4.1 times. This proves that dispersing enhancers such as soybean lecithin, acrylates / ethylhexyl acrylate / polydimethylsiloxane methacrylate copolymer and sorbitan sesquiisostearate can cooperate well with colorants and base oils, making the colorants more evenly dispersed in the base oil with smaller particle size. None of the three can be missing.

[0073] In order to verify whether common lecithin can form a synergistic relationship with acrylates / ethylhexyl acrylate / polydimethylsiloxane methacrylate copolymers and sorbitan sesquiisostearate dispersing synergists, comparative example 2 selected soybean lecithin with an HLB value of 7. The experimental results showed that when the HLB value was 7, the average particle size D50 of the colorant in the colorant homogenate increased by 1.89 times compared with Example 1, and the colorant span increased by 4.36 times. It can be seen that not all soybean lecithins can form a synergistic relationship with other components. Comparative example 3 adjusted soybean lecithin to egg yolk lecithin, which is more common on the market. Although the experimental results of comparative example 3 were improved compared with comparative example 2, the average particle size D50 of the colorant in the colorant homogenate was still increased by 1.82 times compared with Example 1, and the colorant span increased by 3.88 times. It can be seen that egg yolk lecithin cannot be synergistically coordinated with other components.

[0074] In order to verify whether common polymers that can form steric hindrance can replace the acrylates / ethylhexyl acrylate / polydimethylsiloxane methacrylate copolymer of the present application, comparative example 5 is adjusted to acrylates / polytrimethylsiloxane methacrylate copolymer. The experiment shows that with the addition of the polymer, compared with comparative example 4 without adding acrylates / ethylhexyl acrylate / polydimethylsiloxane methacrylate copolymer, the dispersion effect of the colorant in comparative example 5 is reversely worse, and the average particle size D50 of the colorant in the colorant homogenate is 2.3 times greater than that in Example 1, and the colorant span is increased by 4.63 times. It can be seen that the acrylates / ethylhexyl acrylate / polydimethylsiloxane methacrylate copolymer in the present application is not simply used as a steric hindrance regulator, but also has a coordination relationship with other components.

[0075] In Comparative Example 7 of the present application, sorbitan sesquiisostearate is adjusted to polyglycerol-3 diisostearate, and the average particle size D50 of the colorant in the colorant homogenate is increased by 2 times compared with Example 1, and the colorant span is increased by 4.3 times. It can be seen that sorbitan sesquiisostearate of the present application can increase the dispersion effect of the colorant through structural coordination with soybean lecithin.

[0076] In addition, Examples 1 to 4 and Example 6 of the present application further reduce the average particle size D50 of the colorant in the colorant slurry and the span between the colorants in the colorant slurry compared to Examples 5, 7 and 8 by limiting the ratio of the five raw materials (specifically: the added mass of soybean lecithin is 0.25 to 1.6% of the added mass of the base oil, and 1 to 3% of the added mass of the colorant; the added mass of acrylates / ethylhexyl acrylate / polydimethylsiloxane methacrylate copolymer is 0.4 to 1.5% of the added mass of the base oil, and 1 to 3% of the added mass of the colorant; the added mass of the dispersing enhancer is 0.3 to 2% of the sum of the added mass of the base oil and the colorant).

Claims

1. A colorant slurry, characterized in that: Calculated by mass percentage, the colorant slurry consists of the following components: 20-38wt% colorant, Soybean lecithin 0.1-1wt%, Acrylates / ethylhexyl acrylate / polydimethylsiloxane methacrylate copolymer 0.2-1.5wt%, Dispersion enhancer 0.2~1.8wt%, Base oil 60-78wt%; The HLB value of the soybean lecithin is 3-5; the dispersing synergist includes one or more of sorbitan stearate, sorbitan isostearate, sorbitan sesquiisostearate, sorbitan oleate and sorbitan sesquioleate.

2. A colorant slurry according to claim 1, characterized in that: The average particle size D50 of the colorant in the colorant slurry is 0.27-0.36 um; the span of the colorant in the colorant slurry is 0.67-0.

98.

3. A colorant slurry according to claim 1, characterized in that: Calculated by mass percentage, the colorant slurry includes 28wt% titanium dioxide, 0.4wt% Yelkin SS soybean lecithin with an HLB value of 4, 0.6wt% KP-578 acrylates / ethylhexyl acrylate / polydimethylsiloxane methacrylate copolymer, 1wt% sorbitan sesquiisostearate, and 70wt% base oil.

4. A colorant slurry according to claim 1, characterized in that: The colorant includes titanium dioxide and / or iron oxide, and the base oil includes one or more of silicone oil, ester oil, alkane and vegetable oil; the particle size of the colorant is 0.1-0.8 um.

5. A colorant slurry according to claim 1, characterized in that: The added mass of soybean lecithin is 0.25-1.6% of the added mass of base oil, and is 1-3% of the added mass of colorant.

6. A colorant slurry according to claim 5, characterized in that: The added mass of the acrylate / ethylhexyl acrylate / polydimethylsiloxane methacrylate copolymer is 0.4-1.5% of the added mass of the base oil, and is 1-3% of the added mass of the colorant.

7. A colorant slurry according to claim 6, characterized in that: The added mass of the dispersing synergist is 0.3-2% of the sum of the added mass of the base oil and the colorant.

8. The method for preparing a colorant slurry according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1. Mix the colorant and soybean lecithin to obtain mixed particles; S2, sequentially adding mixed particles and a dispersing synergist to a mixture of acrylates / ethylhexyl acrylate / polydimethylsiloxane methacrylate copolymer and part of the base oil to obtain a preliminary dispersed slurry; S3, grinding and dispersing the preliminary dispersed slurry using a three-roll mill to obtain a secondary dispersed slurry; S4. Add the remaining base oil to the secondary dispersion slurry, and disperse it again using a high-speed homogenizer to obtain a colorant slurry.

9. Use of a colorant slurry according to any one of claims 1 to 7 in the preparation of cosmetics.

10. A cosmetic comprising a colorant slurry according to any one of claims 1 to 7.

Images