Preparation method of skin-care makeup-fixing spray

Abstract

The preparation method of the skin-care makeup-fixing spray comprises the following steps: S1, preparing alkali liquor; s2, first-step neutralization and dissolution; s3, neutralizing and dissolving in the second step; and S4, cooling and mixing. A VA / crotonic acid (ester) / neodecanoic acid vinyl ester copolymer and an octyl acrylamide / acrylic acid (ester) / butylaminoethyl methacrylate copolymer are selected as composite film-forming agents, and a specific alkaline agent neutralization and step-by-step dissolution process is matched, so that the make-up fixing spray which is light in texture, free of white chips, durable in make-up and comfortable to use is prepared; the composite film-forming agent solves the problems of high cost, sticky and greasy skin feeling, slow drying speed and easy acne suffocation caused by high additive amount of a film-forming agent of an existing make-up product, and the problems of blocking, darkness, poor portability and the like of make-up powder, can realize long-acting make-up under the condition of low additive amount, reduces the formula cost, has the characteristics of water resistance, sweat resistance, air permeability and comfort, and is suitable for popularization and application. The composition is suitable for various skin types, and has remarkable economic benefits and practical values.

Description

Technical Field

[0001] This invention belongs to the field of cosmetic technology, specifically relating to a method for preparing a skin care setting spray. Background Technology

[0002] With the rapid development of the cosmetics industry, consumers have placed higher demands on the durability and comfort of makeup, upgrading from the traditional 4-8 hour makeup wear requirement to 12-18 hour long-lasting makeup wear, while also pursuing a seamless, non-greasy makeup effect and resisting uncomfortable experiences such as a mask-like feel or tightness. Currently, mainstream setting products mainly include setting powder, setting pressed powder, and setting liquid (setting spray). However, existing setting liquid products mostly use acrylic (ester) / allyl methacrylate copolymers, styrene / acrylic (ester) copolymers, polyvinylpyrrolidone, polyurethanes, VP / VA copolymers, etc., as film-forming agents. Although these film-forming agents can form a film layer with strong adhesion, they have obvious drawbacks. To ensure long-lasting makeup, high dosages of setting agents are required, resulting in products that feel sticky, dry slowly, and have poor breathability, which can hinder normal skin respiration and cause skin problems such as breakouts and itching. At the same time, the high dosage of film-forming agents also increases the cost of the formula. In addition, some setting liquids are prone to whitening and creasing after use, and their effect on suppressing the shine of the makeup is not good. Setting powder products are marketed on absorbing excess facial oil, but in actual use, they often have problems such as caking and not adhering well, which destroys the natural and delicate feel of the makeup. In addition, setting powder easily attracts dust and sebum from the air, which can cause the makeup to become dull and lose its initial bright color over time. Summary of the Invention

[0003] In view of the problems raised in the background art above, the purpose of this invention is to provide a method for preparing a skin care setting spray.

[0004] To achieve the above-mentioned technical objectives, the technical solution adopted by the present invention is as follows:

[0005] A method for preparing a skincare setting spray includes the following steps:

[0006] S1: Preparation of alkaline solution: Using aminomethylpropanol as the alkaline agent, an alkaline solution of appropriate concentration is prepared according to the neutralization calculation formula in the prior art. The mass fraction of aminomethylpropanol in the alkaline solution is 0.12% to 0.32%.

[0007] S2: First step of neutralization and dissolution: Add the VA / crotonic acid (ester) / neodecaned vinyl ester copolymer to the alkaline solution prepared in S1, and stir in a water bath at 70-75°C until completely dissolved. The amount of VA / crotonic acid (ester) / neodecaned vinyl ester copolymer added is 0.8%-1.5%.

[0008] S3: Second step of neutralization and dissolution: Add octylacrylamide / acrylate / butylaminoethyl methacrylate copolymer to S2, adjust the water bath temperature to 60-65℃, and continue stirring and neutralizing until the system is clear and transparent. The amount of octylacrylamide / acrylate / butylaminoethyl methacrylate copolymer added is 0.1%-0.2%.

[0009] S4: Cooling and Mixing: Stop the heat preservation, stir the system and cool it to room temperature, add ethanol and preservative in sequence, stir evenly to obtain skin care and makeup setting spray, wherein the amount of ethanol added is 20% and the amount of preservative added is 0.2%.

[0010] Further specified, in S2 and S3, the stirring speed is 150-250 r / min and the stirring time is 20-40 min to ensure complete neutralization and dissolution.

[0011] Further specifying, in S3, the criterion for determining whether the system is clear and transparent is: when observed under visible light, the system has no visible particles and no turbidity.

[0012] Further specified, in S4, the room temperature range is 20–25°C.

[0013] Further specified, in S4, the purity of ethanol is ≥95%.

[0014] Further specifying, in S4, the preservative is a compound of ethylhexylglycerin and phenoxyethanol.

[0015] Further specifying that in S4, hydrophilic silicone elastomer powder may be added after adding ethanol and before stirring evenly. The hydrophilic silicone elastomer powder is a cross-linked copolymer of polydimethylsiloxane / polyvinyldimethylsiloxane, a compound of silica and butanediol, and the addition amount is 5%.

[0016] The beneficial effects of this invention are as follows: This invention selects VA / crotonic acid (ester) / vinyl neodecanoate copolymer and octylacrylamide / acrylate (ester) / butylaminoethyl methacrylate copolymer as composite film-forming agents, and combines them with specific alkali neutralization and stepwise dissolution processes to prepare a setting spray that is lightweight, free of white residue, long-lasting, and comfortable to use. This invention solves the problems of high cost, sticky skin feel, slow drying speed, and easy acne caused by high addition of film-forming agents in existing setting products, as well as problems such as setting powder caking, dullness, and poor portability. The composite film-forming agent can achieve long-lasting makeup with low addition, reducing the formulation cost, while also being waterproof, sweat-resistant, breathable, and comfortable. It is suitable for various skin types and has significant economic benefits and practical value. Attached Figure Description

[0017] The present invention can be further illustrated by the non-limiting embodiments given in the accompanying drawings;

[0018] Figure 1 This is a schematic flowchart illustrating a method for preparing a skincare setting spray according to an embodiment of the present invention; Detailed Implementation

[0019] To enable those skilled in the art to better understand the present invention, the technical solution of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0020] like Figure 1 As shown, a method for preparing a skincare setting spray according to the present invention includes the following steps:

[0021] S1: Preparation of alkaline solution: Using aminomethylpropanol as the alkaline agent, prepare an alkaline solution of appropriate concentration according to the neutralization calculation formula in the existing technology. The mass fraction of aminomethylpropanol in the alkaline solution is 0.12% to 0.32%.

[0022] S2: First step of neutralization and dissolution: Add the VA / crotonic acid (ester) / neodecaned vinyl ester copolymer to the alkaline solution prepared in S1, and stir in a water bath at 70-75℃ until completely dissolved. The amount of VA / crotonic acid (ester) / neodecaned vinyl ester copolymer added is 0.8%-1.5%.

[0023] S3: Second step of neutralization and dissolution: Add octylacrylamide / acrylate / butylaminoethyl methacrylate copolymer to S2, adjust the water bath temperature to 60-65℃, and continue stirring to neutralize until the system is clear and transparent. The amount of octylacrylamide / acrylate / butylaminoethyl methacrylate copolymer added is 0.1%-0.2%.

[0024] S4: Cooling and Mixing: Stop the heat preservation, stir the system and cool it to room temperature, add ethanol and preservative in sequence, stir evenly to obtain skin care and makeup setting spray, wherein the amount of ethanol added is 20% and the amount of preservative added is 0.2%.

[0025] Preferably, in S2 and S3, the stirring speed is 150-250 r / min and the stirring time is 20-40 min to ensure complete neutralization and dissolution.

[0026] Preferably, in S3, the criteria for determining whether the system is clear and transparent are: when observed under visible light, the system has no visible particles and no turbidity.

[0027] Preferably, in S4, the room temperature range is 20–25°C.

[0028] Preferably, in S4, the purity of ethanol is ≥95%.

[0029] Preferably, in S4, the preservative is a compound of ethylhexylglycerin and phenoxyethanol.

[0030] Preferably, in step S4, a hydrophilic silicone elastomer powder may be added after adding ethanol and before stirring evenly. The hydrophilic silicone elastomer powder is a cross-linked copolymer of polydimethylsiloxane / polyvinyldimethylsiloxane, a compound of silica and butanediol, and the addition amount is 5%.

[0031] First, prepare an alkaline solution containing aminomethylpropanol. Add the VA / crotonic acid (ester) / vinyl neodecanoate copolymer, which has low solubility, to the alkaline solution and neutralize and dissolve it with excess alkaline solution in a 75°C water bath to ensure full dispersion. Then, add the octylacrylamide / acrylate (ester) / butylaminoethyl methacrylate copolymer and adjust the water bath temperature to 65°C to continue neutralization and dissolution until the system is clear and transparent, ensuring that both film-forming agents are completely dissolved and form a stable system. After cooling to room temperature, add ethanol and preservative and stir evenly. If it is necessary to improve the drying speed and oil control effect, hydrophilic silicone elastomer powder can be added to obtain the final setting spray product.

[0032] Among them, aminomethylpropanol was selected as the alkali agent. Compared with traditional alkali agents such as triethanolamine, potassium hydroxide, and sodium hydroxide, aminomethylpropanol has the highest safety, good compatibility with film-forming agents, and can significantly improve the toughness of the film, further optimizing the skin feel of the product.

[0033] Octylacrylamide / acrylate / butylaminoethyl methacrylate copolymer: The octylacrylamide fragment in its molecule gives the product hydrophobicity and flexibility, the acrylate fragment enhances film-forming properties, adhesion and skin adhesion, and the butylaminoethyl methacrylate fragment has amino functional groups, which can be ionized by adjusting the pH value, and has good adsorption and film-forming ability. When used in low amounts, this polymer produces a light, non-greasy and non-heavy film with excellent waterproof and sweat-resistant properties, making it suitable for long-lasting makeup products.

[0034] VA / crotonic acid (ester) / vinyl octanoate copolymer: The vinyl octanoate fragment in its molecule has a branched hydrophobic structure, which can effectively resist the penetration of moisture in the air, ensuring that the makeup stays dry in high humidity environments and preventing the formation of white flakes; the film formed by this polymer has high flexibility, low stickiness, and strong durability, making it suitable for long-term facial makeup. The two film-forming agents mentioned above work synergistically at a mass ratio of 7-8:1, achieving a high film-forming effect with low addition amount, while also having the advantages of low tightness, high durability, and high comfort.

[0035] Example 1

[0036]

[0037] Preparation process: Weigh out aminomethylpropanol and water from phase A, mix them evenly to prepare an alkaline solution, place the alkaline solution in a reactor, heat to 75℃ and maintain the temperature, while stirring, slowly add the VA / crotonic acid (ester) / vinyl neodecanoate copolymer of phase B1 into the reactor, continue stirring and neutralizing until the system is completely transparent, add the octylacrylamide / acrylate (ester) / butylaminoethyl methacrylate copolymer of phase B2 into the reactor, adjust the reactor temperature to 60℃, continue stirring and neutralizing until the system is clear and transparent, stop heating, maintain stirring and allow the system to cool naturally to room temperature, add ethanol and Sharomix of phase C sequentially into the system. TM EG10, after being stirred evenly, is filtered and bottled to obtain a skin care and makeup setting spray.

[0038] Product performance: This product has a transparent appearance, a fine and even spray, a moderate drying speed, and only a slight film feel after drying. The film has a weak reflective effect, no tightness or stickiness, and can last for more than 12 hours. It is suitable for various skin types such as normal, oily, and combination.

[0039] Example 2

[0040]

[0041]

[0042] Preparation process: Weigh aminomethylpropanol and water (phase A), mix to prepare an alkaline solution, heat to 75℃ and maintain the temperature, add phase B1 while stirring, neutralize and dissolve until the system is transparent, add phase B2, adjust the temperature to 60℃, stir until the system is clear and transparent, cool to room temperature, then add ethanol (phase C) and Sharomix. TM EG10, after thorough mixing, filtration, and filling, yields the product.

[0043] Product performance: The product has a transparent appearance, good spray effect, and moderate drying speed; after drying, it is light and unfeeling, with weak film reflection, slight dryness, and no white flakes or creasing; the makeup lasts for more than 10 hours, and it is especially suitable for dry skin.

[0044] Example 3

[0045]

[0046] Preparation process: Weigh aminomethylpropanol (phase A) and water, mix to prepare an alkaline solution, heat to 75℃ and maintain the temperature, add phase B1 while stirring, neutralize and dissolve until the system is transparent, add phase B2, adjust the temperature to 65℃, stir until the system is clear and transparent, cool to room temperature, add ethanol (phase C), stir evenly, and then add DOWSIL (phase D) to the system. TM9801 HydroCosmetic Powder, continue stirring until the powder is completely dispersed and the system is homogeneous, then add Sharomix. TM EG10 is stirred evenly, filtered, and then filled to obtain the product.

[0047] Product performance: This product has a slightly milky white appearance, a fine spray, and dries significantly faster than in Examples 1 and 2; it has good oil absorption, effectively suppresses oily shine on makeup, and leaves no sticky or heavy feeling after drying; it can last for more than 14 hours and is suitable for dry skin and dry skin that is prone to oiliness in summer.

[0048] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A method for preparing a skincare setting spray, characterized in that: Includes the following steps: S1: Preparation of alkaline solution: Using aminomethylpropanol as the alkaline agent, an alkaline solution of appropriate concentration is prepared according to the neutralization calculation formula in the prior art. The mass fraction of aminomethylpropanol in the alkaline solution is 0.12% to 0.32%. S2: First step of neutralization and dissolution: Add the VA / crotonic acid (ester) / neodecaned vinyl ester copolymer to the alkaline solution prepared in S1, and stir in a water bath at 70-75°C until completely dissolved. The amount of VA / crotonic acid (ester) / neodecaned vinyl ester copolymer added is 0.8%-1.5%. S3: Second step of neutralization and dissolution: Add octylacrylamide / acrylate / butylaminoethyl methacrylate copolymer to S2, adjust the water bath temperature to 60-65℃, and continue stirring and neutralizing until the system is clear and transparent. The amount of octylacrylamide / acrylate / butylaminoethyl methacrylate copolymer added is 0.1%-0.2%. S4: Cooling and Mixing: Stop the heat preservation, stir the system and cool it to room temperature, add ethanol and preservative in sequence, stir evenly to obtain skin care and makeup setting spray, wherein the amount of ethanol added is 20% and the amount of preservative added is 0.2%.

2. The method for preparing a skincare setting spray according to claim 1, characterized in that: In S2 and S3, the stirring speed is 150-250 r / min and the stirring time is 20-40 min to ensure complete neutralization and dissolution.

3. The method for preparing a skincare setting spray according to claim 2, characterized in that: In S3, the criteria for determining whether the system is clear and transparent are: when observed under visible light, the system has no visible particles and no turbidity.

4. The method for preparing a skincare setting spray according to claim 3, characterized in that: In S4, the room temperature range is 20–25°C.

5. The method for preparing a skincare setting spray according to claim 4, characterized in that: In S4, the purity of ethanol is ≥95%.

6. The method for preparing a skincare setting spray according to claim 5, characterized in that: In S4, the preservative is a mixture of ethylhexylglycerin and phenoxyethanol.

7. The method for preparing a skincare setting spray according to claim 6, characterized in that: In step S4, a hydrophilic silicone elastomer powder may be added after adding ethanol and before stirring evenly. The hydrophilic silicone elastomer powder is a cross-linked copolymer of polydimethylsiloxane / polyvinyldimethylsiloxane, a compound of silica and butanediol, and the addition amount is 5%.

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