Emulsifier-free face cream and preparation method thereof

Abstract

The invention belongs to the technical field of cosmetics, and particularly relates to an emulsifier-free face cream and a preparation method thereof. The face cream provided by the invention is mainly prepared from the following components in parts by weight: 50 to 67 parts of water, 10 to 40 parts of grease, 5 to 25 parts of a humectant, 0.2 to 0.7 part of a thickening agent, 0.5 part of a preservative and 0.1 to 0.4 part of a pH (Potential of Hydrogen) regulator. According to the face cream provided by the invention, the system stability can be kept without adding an emulsifier, the requirement on the compatibility of the used grease is low, the high stability of the system can be kept only by adjusting the melting point of the oil phase, and the grease proportion of the system can reach 40%. The system is extremely low in irritation, more friendly to sensitive skin, capable of rapidly dissolving water in use, free of sticky feeling after being smeared and capable of providing strong moistening feeling after being absorbed. Compared with a traditional emulsification system, the preparation process has a relatively wide requirement on a homogenizing temperature range, and the temperature is kept above the melting point of an oil phase during homogenizing dispersion.

Description

Technical Field

[0001] The invention belongs to the technical field of cosmetics, and particularly relates to an emulsifier-free facial cream and a preparation method thereof. Background Art

[0002] Currently, most facial cream products on the market are cream products prepared using traditional emulsification technology. The principle is to use emulsifiers to reduce the interfacial tension of the components in the mixed system, prevent the droplets from aggregating with each other, and make the dispersed phase evenly dispersed in the continuous phase to form a relatively stable emulsion.

[0003] Due to the characteristics of traditional emulsification systems, the emulsifiers used have poor biocompatibility, most of which are irritating to a certain extent, and are generally added in high amounts when used. The emulsification stability is greatly affected by oils and fats, and it is necessary to select emulsifiers based on the oil combination. In order to ensure the emulsification stability, it is often necessary to select a variety of emulsifiers for use in combination, making the formula and operability more complicated. When adjusting the skin feel of the formula, there will be more restrictions due to the characteristics of the emulsifier. In the two-phase system, it is difficult to ensure the stability of the system without using emulsifiers.

[0004] When using traditional emulsifiers, it will bring various problems, and it is difficult to ensure the stability of the system without using emulsifiers. This problem has yet to be solved. Summary of the invention

[0005] The object of the present invention is to provide an emulsifier-free facial cream and a preparation method thereof. The emulsifier-free facial cream provided by the present invention can be added with a high proportion of oil, has excellent stability, is mild and non-irritating, can quickly dissolve in water when used, has no sticky feeling when applied, and can provide a strong moisturizing feeling after absorption. The preparation process has a wider homogenization temperature range requirement than the traditional emulsification system, and the homogenization temperature can be maintained above the melting point of the oil phase.

[0006] The technical solution of the present invention is: An emulsifier-free facial cream mainly consists of the following components and their weight parts: 50-67 parts of water, 10-40 parts of oil, 5-25 parts of moisturizer, 0.2-0.7 parts of thickener, 0.5 parts of preservative, and 0.1-0.4 parts of pH regulator; Furthermore, the emulsifier-free cream is mainly composed of the following components and their weight parts: 58.8 parts of water, 25 parts of oil, 15 parts of moisturizer, 0.5 parts of thickener, 0.5 parts of preservative, and 0.2 parts of pH adjuster; Furthermore, the oil contains beeswax and one or more of avocado butter, jojoba seed oil, meadowfoam seed oil, squalane, polydimethylsiloxane, isononyl isononanoate, isopropyl palmitate, hydrogenated coconut glycerides, caprylic / capric triglyceride, octyldodecanol myristate, cetyl ethylhexanoate, and tocopherol acetate.

[0007] Furthermore, the moisturizing agent comprises one or more of glycerin, butylene glycol, propylene glycol, polyethylene glycol-8, pentylene glycol, and isoprene glycol.

[0008] Further, the thickener comprises 0.2-0.5 parts of acrylic acid (ester) / C10-30 alkyl acrylate cross-linked polymer, and may comprise combination 1 consisting of 37.5wt% sodium acrylate / sodium acryloyldimethyl taurate copolymer, 30wt% water, 22.5wt% isohexadecane, 7.5wt% polysorbate-80, and 2.5wt% sorbitan oleate, or combination 2 consisting of 60wt% polyacrylate-13, 28wt% polyisobutylene, 5wt% polysorbate-20, 3wt% sorbitan isostearate, and 4wt% water.

[0009] Furthermore, the preservative is 0.1 part of methylparaben and 0.4 part of (91.5wt% phenoxyethanol, 8.5wt% ethylhexylglycerin); Furthermore, the pH regulator is arginine.

[0010] The preparation method of the emulsifier-free facial cream comprises the following steps: S1 Add part of water, moisturizer, acrylic acid (ester) / C10-30 alkyl acrylate cross-linked polymer in thickener, and methylparaben in preservative into the emulsifier, heat and stir until the mixture is evenly dispersed. When the temperature of the emulsifier reaches 60-90℃, keep warm and stir for 10-30 minutes.

[0011] S2: Add the oil into the oil phase pot, heat and stir until the mixture is evenly mixed. When the temperature of the oil phase pot reaches 60-90°C, keep warm and stir for 10-30 minutes.

[0012] After S3 insulation is finished, continue stirring, start homogenization, put the oil phase into the emulsification pot, maintain 60-90℃, and homogenize for 2-6 minutes.

[0013] S4 continues stirring, maintains homogeneity, cools down to 35-45°C, and controls the cooling time to be 10-20min.

[0014] S5 When the temperature drops to 35-45°C, continue stirring, add the remaining thickener, and homogenize for 1-5 minutes.

[0015] After S6 homogenization is completed, the remaining preservatives and the pH adjuster aqueous solution prepared with the remaining water are added and stirring is continued for 5-10 minutes.

[0016] S7: stirring is finished and the material is discharged.

[0017] Furthermore, after the oil and fat in step S2 is evenly mixed, it can be in a liquid state at 60-90°C, and in a solid state when the temperature is lower than 50°C.

[0018] Furthermore, the stirring speed of steps S1-S7 is 40-80 rpm.

[0019] Furthermore, the homogenization speed of steps S3-S5 is 8000-12000 rpm.

[0020] The beeswax added in the present invention has the function of adjusting the freezing point of the oil phase, can ensure that the oil phase remains in a solid state when the temperature drops below 50°C, and has a good film-forming effect, so that after the facial cream is applied and absorbed, it provides a continuous moisturizing feeling, and at the same time has good biological affinity and is non-irritating.

[0021] The thickener acrylic acid (ester) / C10-30 alkyl acrylate cross-linked polymer added in the present invention has a certain lipophilicity, can ensure the uniform dispersion of the oil phase during high-temperature and high-speed homogenization, and ensure that the oil phase does not aggregate during the cooling process during high-speed homogenization. After the temperature drops below 50°C, the oil phase solidifies, and the acrylic acid (ester) / C10-30 alkyl acrylate cross-linked polymer is adsorbed on the surface of the oil phase. After the pH adjuster is added for neutralization, negative charges are generated along the main chain of the polymer. The repulsive force between the charges causes the curled polymer to become an unfolded structure, and the swollen microgel (hydrogel formed by acrylic acid (ester) / C10-30 alkyl acrylate cross-linked polymer and water) fills the space, thickens the water phase, and forms a stable system.

[0022] Compared with the prior art, the emulsifier-free facial cream provided by the present invention has the following advantages: (1) The emulsifier-free facial cream provided by the present invention does not contain any emulsifier, has low irritation, high safety, and good biocompatibility. It has high compatibility, and there is no need to consider the oil compatibility issue when formulating, and is suitable for most cosmetic raw materials. It has extremely high stability.

[0023] (2) The emulsifier-free facial cream provided by the present invention has good spreadability. Even when the oil phase ratio of the system is high, it can still have a strong moisturizing feeling when applied, is refreshing and non-greasy, is not sticky or shiny after absorption, and can provide a continuous moisturizing feeling. DETAILED DESCRIPTION

[0024] In order to make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below, but this is not a limitation of the present invention. All other implementation methods obtained by technical personnel in the field of technology based on the basic idea of ​​the present invention belong to the scope of protection of the present invention.

[0025] The raw materials used in the present invention are all commercially available cosmetic raw material products.

[0026] Example 1 An emulsifier-free facial cream consists of the following components and their weight proportions: 58.8 parts of water, 25 parts of oil, 15 parts of glycerol as a moisturizer, 0.5 parts of a thickener, 0.5 parts of a preservative, and 0.2 parts of arginine as a pH regulator.

[0027] The oil is composed of 6 parts of beeswax, 5 parts of avocado tree butter, 5 parts of jojoba seed oil, 5 parts of cetyl ethylhexanoate and 4 parts of polydimethylsiloxane.

[0028] The thickener is composed of 0.3 parts of acrylic acid (ester) / C10-30 alkyl acrylate cross-linked polymer and 0.2 parts of (sodium acrylate / sodium acryloyldimethyl taurate copolymer, water, isohexadecane, polysorbate-80, sorbitan oleate).

[0029] The preservatives are 0.1 parts of methylparaben and 0.4 parts of (91.5wt% phenoxyethanol, 8.5wt% ethylhexylglycerin).

[0030] The preparation method of the emulsifier-free facial cream comprises the following steps: S1: Add 56.8 parts of water, glycerin, acrylic acid (esters) / C10-30 alkyl acrylate crosspolymer, and methylparaben into an emulsifier, heat and stir until the mixture is evenly dispersed. When the temperature of the emulsifier reaches 90°C, keep warm and stir for 20 minutes.

[0031] S2: Add oil phase beeswax, avocado butter, jojoba seed oil, cetyl ethylhexanoate and polydimethylsiloxane into the oil phase pot, heat and stir until the mixture is uniform. When the temperature of the oil phase pot reaches 85°C, keep warm and stir for 20 minutes.

[0032] After S3 insulation is completed, continue stirring, start homogenization, put the oil phase into the emulsification pot, maintain 80℃, and homogenize for 5 minutes.

[0033] S4 continued stirring, maintained homogeneity, cooled to 40°C, and controlled the cooling time to be 15 min.

[0034] S5 When the temperature drops to 40°C, continue stirring and add (sodium acrylate / sodium acryloyldimethyl taurate copolymer, water, isohexadecane, polysorbate 80, sorbitan oleate) and homogenize for 3 minutes.

[0035] After S6 homogenization is completed, add (phenoxyethanol, ethylhexylglycerin), and the remaining 2 parts of water to prepare the arginine solution, and continue stirring for 10 minutes.

[0036] S7: stirring is finished and the material is discharged.

[0037] The stirring speed of steps S1-S7 is 60 rpm.

[0038] The homogenization speed in steps S3-S5 is 10000 rpm.

[0039] The emulsification pot in step S1 is an EKATO SYSTEM UNIMIX LM6 emulsification pot.

[0040] The complete melting temperature of the oil phase in step S2 is 59.3°C, and it is in a solid state at 50°C.

[0041] Example 2 An emulsifier-free facial cream consists of the following components and their weight proportions: 50 parts of water, 40 parts of oil, 8.4 parts of glycerol as a moisturizer, 0.7 parts of a thickener, 0.5 parts of a preservative, and 0.4 parts of arginine as a pH regulator.

[0042] The oil is composed of 8 parts of beeswax, 8 parts of avocado tree butter, 8 parts of jojoba seed oil, 10 parts of cetyl ethylhexanoate and 6 parts of polydimethylsiloxane.

[0043] The thickener is composed of 0.5 parts of acrylic acid (esters) / C10-30 alkyl acrylate cross-linked polymer and 0.2 parts of (sodium acrylate / sodium acryloyldimethyl taurate copolymer, water, isohexadecane, polysorbate-80, sorbitan oleate).

[0044] The preservatives are 0.1 parts of methylparaben and 0.4 parts of (91.5wt% phenoxyethanol, 8.5wt% ethylhexylglycerin).

[0045] The preparation method of the emulsifier-free facial cream comprises the following steps: S1: Add 48 parts of water, glycerin, acrylic acid (esters) / C10-30 alkyl acrylate crosspolymer and methylparaben into an emulsifier, heat and stir until the mixture is evenly dispersed. When the temperature of the emulsifier reaches 90°C, keep warm and stir for 20 minutes.

[0046] S2: Add oil phase beeswax, avocado butter, jojoba seed oil, cetyl ethylhexanoate and polydimethylsiloxane into the oil phase pot, heat and stir until the mixture is uniform. When the temperature of the oil phase pot reaches 85°C, keep warm and stir for 15 minutes.

[0047] After S3 insulation is completed, continue stirring, start homogenization, put the oil phase into the emulsification pot, maintain 80℃, and homogenize for 5 minutes.

[0048] S4 continued stirring, maintained homogeneity, cooled to 40°C, and controlled the cooling time to be 15 min.

[0049] S5 When the temperature drops to 40°C, continue stirring and add (sodium acrylate / sodium acryloyldimethyl taurate copolymer, water, isohexadecane, polysorbate 80, sorbitan oleate) and homogenize for 3 minutes.

[0050] After S6 homogenization is completed, add (phenoxyethanol, ethylhexylglycerin), and the remaining 2 parts of water to prepare the arginine solution, and continue stirring for 10 minutes.

[0051] S7: stirring is finished and the material is discharged.

[0052] The stirring speed of steps S1-S7 is 80 rpm.

[0053] The homogenization speed in steps S3-S5 is 12000 rpm.

[0054] The emulsification pot in step S1 is an EKATO SYSTEM UNIMIX LM6 emulsification pot.

[0055] The complete melting temperature of the oil phase in step S2 is 58.4°C, and it is in a solid state at 50°C.

[0056] Example 3 An emulsifier-free facial cream consists of the following components and their weight proportions: 67 parts of water, 10 parts of oil, 22.2 parts of glycerol as a moisturizer, 0.2 parts of a thickener, 0.5 parts of a preservative, and 0.1 parts of arginine as a pH regulator.

[0057] The oil is composed of 4 parts of beeswax, 2 parts of jojoba seed oil, 2 parts of cetyl ethylhexanoate and 2 parts of polydimethylsiloxane.

[0058] The thickener is 0.2 parts of acrylic acid (ester) / C10-30 alkyl acrylate cross-linked polymer.

[0059] The preservatives are 0.1 parts of methylparaben and 0.4 parts of (91.5wt% phenoxyethanol, 8.5wt% ethylhexylglycerin).

[0060] The preparation method of the emulsifier-free facial cream comprises the following steps: S1: Add 65 parts of water, glycerin, acrylic acid (esters) / C10-30 alkyl acrylate crosspolymer and methylparaben into an emulsifier, heat and stir until the mixture is evenly dispersed. When the temperature of the emulsifier reaches 90°C, keep warm and stir for 20 minutes.

[0061] S2: Add oil phase beeswax, jojoba seed oil, cetyl ethylhexanoate and polydimethylsiloxane into the oil phase pot, heat and stir until the mixture is uniform. When the temperature of the oil phase pot reaches 90°C, keep warm and stir for 20 minutes.

[0062] After S3 insulation is completed, continue stirring, start homogenization, put the oil phase into the emulsification pot, maintain 85℃, and homogenize for 5 minutes.

[0063] S4 continued stirring, maintained homogeneity, cooled to 40°C, and controlled the cooling time to be 15 min.

[0064] After S5 homogenization is completed, add (phenoxyethanol, ethylhexylglycerin), and the remaining 2 parts of water to prepare the arginine solution, and continue stirring for 10 minutes.

[0065] S6: stirring is finished and the material is discharged.

[0066] The stirring speed of steps S1-S6 is 40 rpm.

[0067] The homogenization speed in steps S3-S4 is 8000 rpm.

[0068] The emulsification pot in step S1 is an EKATO SYSTEM UNIMIX LM6 emulsification pot.

[0069] The complete melting temperature of the oil phase in step S2 is 61.2° C., and it is in a solid state at 50° C.

[0070] Comparative Example 1 An emulsifier-free facial cream consists of the following components and their weight proportions: 58.8 parts of water, 25 parts of oil, 15 parts of glycerol as a moisturizer, 0.5 parts of a thickener, 0.5 parts of a preservative, and 0.2 parts of arginine as a pH regulator.

[0071] The oil is composed of 11 parts of avocado tree butter, 5 parts of jojoba seed oil, 5 parts of cetyl ethylhexanoate and 4 parts of polydimethylsiloxane.

[0072] The thickener is composed of 0.3 parts of acrylic acid (ester) / C10-30 alkyl acrylate cross-linked polymer and 0.2 parts of (sodium acrylate / sodium acryloyldimethyl taurate copolymer, water, isohexadecane, polysorbate-80, sorbitan oleate).

[0073] The preservatives are 0.1 parts of methylparaben and 0.4 parts of (91.5wt% phenoxyethanol, 8.5wt% ethylhexylglycerin).

[0074] The preparation method of the emulsifier-free facial cream comprises the following steps: S1: Add 56.8 parts of water, glycerin, acrylic acid (esters) / C10-30 alkyl acrylate crosspolymer, and methylparaben into an emulsifier, heat and stir until the mixture is evenly dispersed. When the temperature of the emulsifier reaches 90°C, keep warm and stir for 20 minutes.

[0075] S2: Add avocado butter, jojoba seed oil, cetyl ethylhexanoate and polydimethylsiloxane into the oil phase pot, heat and stir until the mixture is uniform. When the temperature of the oil phase pot reaches 90°C, keep warm and stir for 20 minutes.

[0076] After S3 insulation is completed, continue stirring, start homogenization, put the oil phase into the emulsification pot, maintain 85℃, and homogenize for 5 minutes.

[0077] S4 continues stirring, maintains homogeneity, cools down to 35-45°C, and controls the cooling time to be 15 minutes.

[0078] S5 When the temperature drops to 40°C, continue stirring and add (sodium acrylate / sodium acryloyldimethyl taurate copolymer, water, isohexadecane, polysorbate 80, sorbitan oleate) and homogenize for 3 minutes.

[0079] After S6 homogenization is completed, add (phenoxyethanol, ethylhexylglycerin), and the remaining 2 parts of water to prepare the arginine solution, and continue stirring for 10 minutes.

[0080] S7: stirring is finished and the material is discharged.

[0081] The stirring speed of steps S1-S7 is 60 rpm.

[0082] The homogenization speed in steps S3-S5 is 10000 rpm.

[0083] The emulsification pot in step S1 is an EKATO SYSTEM UNIMIX LM6 emulsification pot.

[0084] The complete melting temperature of the oil phase in step S2 is 32° C., and it is in a liquid state at 50° C.

[0085] The preparation method of the emulsifier-free facial cream is similar to that of Example 1.

[0086] The difference from Example 1 is that beeswax is replaced with avocado butter, and the oil phase is not controlled to be in a solid state at 50° C. by using beeswax.

[0087] Comparative Example 2 An emulsifier-free facial cream consists of the following components and their weight proportions: 58.8 parts of water, 25 parts of oil, 15 parts of glycerol as a moisturizer, 0.5 parts of a thickener, 0.5 parts of a preservative, and 0.2 parts of arginine as a pH regulator.

[0088] The oil is composed of 6 parts of beeswax, 5 parts of avocado tree butter, 5 parts of jojoba seed oil, 5 parts of cetyl ethylhexanoate and 4 parts of polydimethylsiloxane.

[0089] The thickener is composed of 0.3 parts of carbomer and 0.2 parts of (sodium acrylate / sodium acryloyldimethyl taurate copolymer, water, isohexadecane, polysorbate-80, sorbitan oleate).

[0090] The preservatives are 0.1 parts of methylparaben and 0.4 parts of (91.5wt% phenoxyethanol, 8.5wt% ethylhexylglycerin).

[0091] The preparation method of the emulsifier-free facial cream comprises the following steps: S1: Add 56.8 parts of water, glycerin, carbomer and methylparaben into an emulsifier, heat and stir until the mixture is evenly dispersed. When the temperature of the emulsifier reaches 90°C, keep warm and stir for 20 minutes.

[0092] S2: Add oil phase beeswax, avocado butter, jojoba seed oil, cetyl ethylhexanoate and polydimethylsiloxane into the oil phase pot, heat and stir until the mixture is uniform. When the temperature of the oil phase pot reaches 85°C, keep warm and stir for 20 minutes.

[0093] After S3 insulation is completed, continue stirring, start homogenization, put the oil phase into the emulsification pot, maintain 80℃, and homogenize for 5 minutes.

[0094] S4 continued stirring, maintained homogeneity, cooled to 40°C, and controlled the cooling time to be 15 min.

[0095] S5 When the temperature drops to 40°C, continue stirring and add (sodium acrylate / sodium acryloyldimethyl taurate copolymer, water, isohexadecane, polysorbate 80, sorbitan oleate) and homogenize for 3 minutes.

[0096] After S6 homogenization is completed, add (phenoxyethanol, ethylhexylglycerin), and the remaining 2 parts of water to prepare the arginine solution, and continue stirring for 10 minutes.

[0097] S7: stirring is finished and the material is discharged.

[0098] The stirring speed of steps S1-S7 is 60 rpm.

[0099] The homogenization speed in steps S3-S5 is 10000 rpm.

[0100] The emulsification pot in step S1 is an EKATO SYSTEM UNIMIX LM6 emulsification pot.

[0101] The complete melting temperature of the oil phase in step S2 is 59.3°C, and it is in a solid state at 50°C.

[0102] The preparation method of the emulsifier-free facial cream is similar to that of Example 1.

[0103] The difference from Example 1 is that the acrylic acid (esters) / C10-30 alkyl acrylate cross-linked polymer is replaced by carbomer.

[0104] Comparative Example 3 An emulsifier-free facial cream consists of the following components and their weight proportions: 58.8 parts of water, 25 parts of oil, 15 parts of glycerol as a moisturizer, 0.5 parts of a thickener, 0.5 parts of a preservative, and 0.2 parts of arginine as a pH regulator.

[0105] The oil is composed of 6 parts of beeswax, 5 parts of avocado tree butter, 5 parts of jojoba seed oil, 5 parts of cetyl ethylhexanoate and 4 parts of polydimethylsiloxane.

[0106] The thickener is composed of 0.3 parts of acrylic acid (ester) / C10-30 alkyl acrylate cross-linked polymer and 0.2 parts of (sodium acrylate / sodium acryloyldimethyl taurate copolymer, water, isohexadecane, polysorbate-80, sorbitan oleate).

[0107] The preservatives are 0.1 parts of methylparaben and 0.4 parts of (91.5wt% phenoxyethanol, 8.5wt% ethylhexylglycerin).

[0108] The preparation method of the emulsifier-free facial cream comprises the following steps: S1: Add 56.8 parts of water, glycerin, acrylic acid (esters) / C10-30 alkyl acrylate crosspolymer, and methylparaben into an emulsifier, heat and stir until the mixture is evenly dispersed. When the temperature of the emulsifier reaches 90°C, keep warm and stir for 20 minutes.

[0109] S2: Add oil phase beeswax, avocado butter, jojoba seed oil, cetyl ethylhexanoate and polydimethylsiloxane into the oil phase pot, heat and stir until the mixture is uniform. When the temperature of the oil phase pot reaches 85°C, keep warm and stir for 20 minutes.

[0110] After S3 insulation is completed, continue stirring, start homogenization, put the oil phase into the emulsification pot, maintain 80℃, and homogenize for 5 minutes.

[0111] After S4 homogenization is completed, continue stirring and cool to 40°C, and control the cooling time to 15 minutes.

[0112] S5 When the temperature drops to 40°C, continue stirring and add (sodium acrylate / sodium acryloyldimethyl taurate copolymer, water, isohexadecane, polysorbate 80, sorbitan oleate) and homogenize for 3 minutes.

[0113] After S6 homogenization is completed, add (phenoxyethanol, ethylhexylglycerin), and the remaining 2 parts of water to prepare the arginine solution, and continue stirring for 10 minutes.

[0114] S7: stirring is finished and the material is discharged.

[0115] The stirring speed of steps S1-S7 is 60 rpm.

[0116] The homogenization speed in steps S3 and S5 is 10000 rpm.

[0117] The emulsification pot in step S1 is an EKATO SYSTEM UNIMIX LM6 emulsification pot.

[0118] The complete melting temperature of the oil phase in step S2 is 59.3°C, and it is in a solid state at 50°C.

[0119] The formula of the emulsifier-free cream is similar to that of Example 1.

[0120] The difference from Example 1 is that the temperature is not lowered under homogenous conditions.

[0121] Comparative Example 4 An emulsifier-free facial cream consists of the following components and their weight proportions: 67 parts of water, 10 parts of oil, 22.3 parts of glycerol as a moisturizer, 0.1 part of a thickener, 0.5 part of a preservative, and 0.1 part of arginine as a pH regulator.

[0122] The oil is composed of 4 parts of beeswax, 2 parts of jojoba seed oil, 2 parts of cetyl ethylhexanoate and 2 parts of polydimethylsiloxane.

[0123] The thickener is 0.1 part of acrylic acid (ester) / C10-30 alkyl acrylate cross-linked polymer.

[0124] The preservatives are 0.1 parts of methylparaben and 0.4 parts of (91.5wt% phenoxyethanol, 8.5wt% ethylhexylglycerin).

[0125] The preparation method of the emulsifier-free facial cream comprises the following steps: S1: Add 65 parts of water, glycerin, acrylic acid (esters) / C10-30 alkyl acrylate crosspolymer and methylparaben into an emulsifier, heat and stir until the mixture is evenly dispersed. When the temperature of the emulsifier reaches 90°C, keep warm and stir for 20 minutes.

[0126] S2: Add oil phase beeswax, jojoba seed oil, cetyl ethylhexanoate and polydimethylsiloxane into the oil phase pot, heat and stir until the mixture is uniform. When the temperature of the oil phase pot reaches 85°C, keep warm and stir for 20 minutes.

[0127] After S3 insulation is completed, continue stirring, start homogenization, put the oil phase into the emulsification pot, maintain 80℃, and homogenize for 5 minutes.

[0128] S4 continued stirring, maintained homogeneity, cooled to 40°C, and controlled the cooling time to be 15 min.

[0129] After S5 homogenization is completed, add (phenoxyethanol, ethylhexylglycerin), and the remaining 2 parts of water to prepare the arginine solution, and continue stirring for 10 minutes.

[0130] S6: stirring is finished and the material is discharged.

[0131] The stirring speed of steps S1-S6 is 40 rpm.

[0132] The homogenization speed in steps S3-S4 is 8000 rpm.

[0133] The emulsification pot in step S1 is an EKATO SYSTEM UNIMIX LM6 emulsification pot.

[0134] The complete melting temperature of the oil phase in step S2 is 61.2° C., and it is in a solid state at 50° C.

[0135] The formula of the emulsifier-free cream is similar to that of Example 3.

[0136] The difference from Example 3 is that the amount of acrylic acid (esters) / C10-30 alkyl acrylate cross-linked polymer is 0.1 part.

[0137] Comparative Example 5 An emulsifier-free facial cream consists of the following components and their weight proportions: 50 parts of water, 40 parts of oil, 8.3 parts of glycerol as a moisturizer, 0.8 parts of a thickener, 0.5 parts of a preservative, and 0.4 parts of arginine as a pH regulator.

[0138] The oil is composed of 8 parts of beeswax, 8 parts of avocado tree butter, 8 parts of jojoba seed oil, 10 parts of cetyl ethylhexanoate and 6 parts of polydimethylsiloxane.

[0139] The thickener is composed of 0.6 parts of acrylic acid (ester) / C10-30 alkyl acrylate cross-linked polymer and 0.2 parts of (sodium acrylate / sodium acryloyldimethyl taurate copolymer, water, isohexadecane, polysorbate-80, sorbitan oleate).

[0140] The preservatives are 0.1 parts of methylparaben and 0.4 parts of (91.5wt% phenoxyethanol, 8.5wt% ethylhexylglycerin).

[0141] The preparation method of the emulsifier-free facial cream comprises the following steps: S1: Add 48 parts of water, glycerin, acrylic acid (esters) / C10-30 alkyl acrylate crosspolymer and methylparaben into an emulsifier, heat and stir until the mixture is evenly dispersed. When the temperature of the emulsifier reaches 90°C, keep warm and stir for 20 minutes.

[0142] S2: Add oil phase beeswax, avocado butter, jojoba seed oil, cetyl ethylhexanoate and polydimethylsiloxane into the oil phase pot, heat and stir until the mixture is uniform. When the temperature of the oil phase pot reaches 85°C, keep warm and stir for 20 minutes.

[0143] After S3 insulation is completed, continue stirring, start homogenization, put the oil phase into the emulsification pot, maintain 80℃, and homogenize for 5 minutes.

[0144] S4 continued stirring, maintained homogeneity, cooled to 40°C, and controlled the cooling time to be 15 min.

[0145] S5 When the temperature drops to 40°C, continue stirring and add (sodium acrylate / sodium acryloyldimethyl taurate copolymer, water, isohexadecane, polysorbate 80, sorbitan oleate) and homogenize for 3 minutes.

[0146] After S6 homogenization is completed, add (phenoxyethanol, ethylhexylglycerin), and the remaining 2 parts of water to prepare the arginine solution, and continue stirring for 10 minutes.

[0147] S7: stirring is finished and the material is discharged.

[0148] The stirring speed of steps S1-S7 is 80 rpm.

[0149] The homogenization speed in steps S3-S5 is 12000 rpm.

[0150] The emulsification pot in step S1 is an EKATO SYSTEM UNIMIX LM6 emulsification pot.

[0151] The complete melting temperature of the oil phase in step S2 is 58.4°C, and it is in a solid state at 50°C.

[0152] The formula of the emulsifier-free cream is similar to that of Example 2.

[0153] The difference from Example 2 is that the amount of acrylic acid (esters) / C10-30 alkyl acrylate cross-linked polymer is 0.6 parts.

[0154] Test Example 1, Preparation Method Evaluation: Table 1 Results of the preparation method of emulsifier-free cream It can be seen from the above table that the sample cannot be successfully prepared without adding acrylic acid (esters) / C10-30 alkyl acrylate cross-linked polymer and without cooling under homogenizing conditions. It can be concluded that the inclusion of acrylic acid (esters) / C10-30 alkyl acrylate cross-linked polymer in the formula and cooling under homogenizing conditions are necessary conditions for preparing the sample. When the addition amount of acrylic acid (esters) / C10-30 alkyl acrylate cross-linked polymer is more than 0.5 parts, the material viscosity will be too high and it will not be practical.

[0155] Table 2 Emulsifier-free cream stability test results As can be seen from the table above, the sample in Comparative Example 1, which does not control the oil phase to be in a solid state within the ambient temperature range by adding beeswax, has extremely poor stability. Since this system does not contain an emulsifier, it is impossible to reduce the interfacial tension of the components in the mixed system by an emulsifier to prevent the droplets from aggregating with each other. The lipophilicity and thickening effect of the cross-linked polymer of alkyl acrylate make the dispersed phase uniformly dispersed in the continuous phase. Therefore, it is necessary to make the dispersed phase in a solid state to prevent the aggregation of the dispersed phase, and make full use of the suspension effect of the thickener to keep the system stable. In order to ensure that the dispersed phase of the system will not be affected by temperature and undergo phase change during the application of the actual product, thereby destroying the stability of the system, it is necessary to keep the melting point of the oil phase below the maximum ambient temperature and give a certain redundancy. Therefore, the system needs to control the melting point of the oil phase to be above 50°C. The amount of acrylic acid (ester) / C10-30 alkyl acrylate cross-linked polymer added in comparative example 4 is too low, resulting in too low overall viscosity of the system, and the oil phase cannot be stably suspended. Therefore, water-oil phase separation occurs under centrifugal, heat-resistant and hot and cold alternating conditions. The sample obtained in Example 1-3 has excellent stability. Therefore, the melting point of the oil phase is controlled to be above 50°C by adding beeswax and the amount of acrylic acid (ester) / C10-30 alkyl acrylate cross-linked polymer added is above 0.2 parts. The sample can obtain better stability.

[0156] Table 3 Safety test results of emulsifier-free cream Test Example 2, skin feel evaluation: Skin feel evaluation method: 30 volunteers were selected to use the samples prepared in Examples 1-3 in the same way. After cleansing, appropriate samples were applied to the face, and a trial questionnaire was filled out and scored. A 7-point system was used, and the higher the score, the better the satisfaction. The evaluation indicators included the preference for the appearance of the paste, the preference for the moist feeling when applying, the preference for the greasy feeling when applying, the preference for the sticky feeling when applying, the preference for the greasy feeling after applying, the preference for the sticky feeling after applying, the preference for the moist feeling after applying, and the overall evaluation.

[0157] Experimental results: See Table 4 Table 4 Skin feel evaluation results From the skin feel evaluation results of 30 volunteers in Table 4, it can be seen that the skin feel of Example 1 is good both during and after application. As the oil phase ratio increases, the greasy and sticky feelings will increase, but the moisturizing degree will not be significantly improved. As the oil phase ratio decreases, the skin feel does not change significantly during application, but the moisturizing feeling decreases significantly after absorption. The overall evaluation of Examples 1-3 is all above 5.5 points, indicating that the skin feel of the three examples of the present invention is good.

[0158] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field who attempts to make appropriate modifications or improvements within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. An emulsifier-free facial cream, characterized in that: It is mainly composed of the following components and their weight parts: 50-67 parts of water, 10-40 parts of oil, 5-25 parts of moisturizer, 0.2-0.7 parts of thickener, 0.5 parts of preservative, and 0.1-0.4 parts of pH adjuster; The oil comprises beeswax and one or more of avocado butter, jojoba seed oil, meadowfoam seed oil, squalane, dimethicone, isononyl isononanoate, isopropyl palmitate, hydrogenated coconut glycerides, caprylic / capric triglyceride, octyldodecanol myristate, cetyl ethylhexanoate, and tocopheryl acetate; The thickener comprises 0.2-0.5 parts of acrylic acid (ester) / C10-30 alkyl acrylate cross-linked polymer, and comprises combination 1 consisting of 37.5wt% sodium acrylate / sodium acryloyldimethyl taurate copolymer, 30wt% water, 22.5wt% isohexadecane, 7.5wt% polysorbate-80, and 2.5wt% sorbitan oleate, or combination 2 consisting of 60wt% polyacrylate-13, 28wt% polyisobutylene, 5wt% polysorbate-20, 3wt% sorbitan isostearate, and 4wt% water.

2. The emulsifier-free facial cream according to claim 1, characterized in that It is mainly composed of the following components and their weight proportions: 58.8 parts of water, 25 parts of oil, 15 parts of moisturizer, 0.5 parts of thickener, 0.5 parts of preservative and 0.2 parts of pH adjuster.

3. The emulsifier-free facial cream according to claim 1, characterized in that The moisturizing agent comprises one or more of glycerin, butylene glycol, propylene glycol, polyethylene glycol-8, pentylene glycol, and isoprene glycol.

4. The emulsifier-free facial cream according to claim 1, characterized in that The preservative is 0.1 part of methylparaben and 0.4 part of a mixture consisting of 91.5 wt % of phenoxyethanol and 8.5 wt % of ethylhexylglycerin.

5. The emulsifier-free facial cream according to claim 1, characterized in that The pH regulator is arginine.

6. The method for preparing the emulsifier-free facial cream according to any one of claims 1 to 5, characterized in that: The following steps are involved: S1 Add most of the water, moisturizer, acrylic acid (ester) / C10-30 alkyl acrylate cross-linked polymer in the thickener, and methylparaben in the preservative into the emulsifier, heat and stir until the mixture is evenly dispersed. When the temperature of the emulsifier reaches 60-90℃, keep warm and stir for 10-30 minutes; S2: Add the oil to the oil phase pot, heat and stir until the mixture is uniform. When the temperature of the oil phase pot reaches 60-90°C, keep warm and stir for 10-30 minutes. After S3 is finished, continue stirring, start homogenization, put the oil phase into the emulsification pot, maintain 60-90℃, and homogenize for 2-6 minutes; S4 continues stirring, maintains homogeneity, cools down to 35-45°C, and controls the cooling time to be 10-20min; S5 When the temperature drops to 35-45°C, continue stirring, add the remaining thickener, and homogenize for 1-5 minutes; After S6 homogenization is completed, add the remaining preservatives and the pH adjuster solution prepared with the remaining water, and continue stirring for 5-10 minutes; S7: stirring is finished and the material is discharged.

7. The method for preparing the emulsifier-free facial cream according to claim 6, characterized in that: After the oil and fat in step S2 are evenly mixed, the complete melting temperature is in the range of 50-90° C., and it is in a solid state when the temperature is below 50° C.

8. The method for preparing the emulsifier-free facial cream according to claim 6, characterized in that: The stirring speed of steps S1-S7 is 40-80 rpm.

9. The method for preparing the emulsifier-free facial cream according to claim 6, characterized in that: The homogenization speed of steps S3-S5 is 8000-12000 rpm.

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