Transparent-appearance waterproof film-forming sunscreen gel and preparation method thereof

Abstract

The sunscreen gel with transparent appearance and waterproof and film-forming functions comprises a water-phase component and an oil-phase component, and the water-phase component comprises a humectant, polyol, a water-soluble skin conditioner, a water-soluble sunscreen agent, a water-soluble film-forming agent, a neutralizer, a preservative and deionized water; the oil phase comprises an emollient, an oil-soluble film-forming agent, an oil-soluble sun-screening agent, an emulsifier, an oil-soluble skin conditioner and essence. The preparation method comprises the following steps: step 1, stirring and heating the deionized water, adding the humectant, the polyol, the water-soluble skin conditioner, the water-soluble sun-screening agent and the water-soluble film-forming agent, dispersing and dissolving, and cooling; step 2, mixing a neutralizer and a preservative to obtain a mixture A; step 3, stirring an emollient, an emulsifier, an oil-soluble sun-screening agent, an oil-soluble film-forming agent and an oil-soluble skin conditioner to prepare a mixture B; and 4, starting stirring, pumping the mixture A into the mixture B, homogenizing, and discharging. The transparent sunscreen coating disclosed by the invention has good transparency and a relatively good sunscreen effect.

Description

Technical Field

[0001] The invention relates to the field of sunscreen cosmetics, and in particular to a sunscreen gel which is transparent in appearance and waterproof and film-forming, and a preparation method thereof. Background Art

[0002] Sunscreen cosmetics refer to special cosmetics that contain sunscreen agents that can block or absorb ultraviolet rays, and use the absorption, reflection or scattering of light by sunscreen agents to prevent the skin from getting tanned or sunburned. Common sunscreen products on the market are as follows according to their formula system and characteristics:

[0003] 1. Water-in-oil system (W / O): The most common sunscreen system, with strong water and sweat resistance, and it is easy to achieve a high sun protection value, but the skin usually feels greasy and heavy, and it is not easy to wash off. In addition, because the overall polarity of the system raw materials is relatively high, it is difficult to make a stable product;

[0004] 2. Oil-in-water system (O / W): The skin feels refreshing and easy to apply, easy to clean, and easy to make stable products, but the water and sweat resistance is poor, and it is difficult to achieve a high sun protection value;

[0005] 3. All-oil system: It has strong water and sweat resistance, but it feels very bad on the skin and requires strong makeup remover to clean it.

[0006] 4. Ethanol solubilizing system: It can produce a sunscreen system that feels refreshing and transparent, but it is difficult to achieve a high sun protection value, and its water resistance and film formation are poor. It is only suitable for making water-based spray products. The high content of ethanol can easily cause irritation to the skin and eyes, and the production and transportation risks are relatively high.

[0007] There are many transparent sunscreen products on the market, such as transparent sunscreen gel, sunscreen jelly, etc., which have a refreshing skin feel and a strong water-dissolving effect. They are very popular among consumers in the hot summer, but most of them have the following problems:

[0008] The first is: sunscreen gel achieves stable balance through emulsification. The appearance of the paste after high-speed homogenization and emulsification is usually milky white and opaque. It is difficult to judge whether the paste raw materials are uniform and whether they are stable and will not precipitate in the later stage, which also affects the aesthetic appearance.

[0009] The second is that under the premise of good stability and excellent skin feel, it is difficult for sunscreen gel to achieve good water resistance and sweat resistance, and it is difficult to form a long-lasting film on the skin.

[0010] Therefore, we propose a sunscreen gel with transparent appearance and waterproof film-forming property and a preparation method thereof. Summary of the invention

[0011] The purpose of the present invention is to solve the problems raised by the existing background technology and to achieve the above invention purpose. The present invention provides the following technical solutions: a transparent and waterproof film-forming sunscreen gel, comprising an aqueous phase component and an oil phase component, wherein both the aqueous phase component and the oil phase component are transparent, and the difference in refractive index between the aqueous phase component and the oil phase component is ≤0.002. The aqueous phase is a mixture of moisturizer, polyol, water-soluble skin conditioner, water-soluble sunscreen, water-soluble film former, neutralizer, preservative and deionized water; the oil phase is a mixture of emollient, oil-soluble film former, oil-soluble sunscreen, emulsifier, oil-soluble skin conditioner and fragrance; the aqueous phase and the oil phase are composed of the following mass percentages:

[0012] Aqueous phase:

[0013] Moisturizer 0.5-5%;

[0014] Polyol 10-20%;

[0015] Water-soluble skin conditioning agent 1.2-5%;

[0016] Water-soluble sunscreen 3-15%;

[0017] Water-soluble film-forming agent 0.5-5%;

[0018] Neutralizer 1-5%;

[0019] Preservatives 0.1-1%;

[0020] Deionized water balance;

[0021] Oil phase:

[0022] Emollients 5-30%;

[0023] Oil-soluble film-forming agent 0.5-5%;

[0024] Oil-soluble sunscreen 0.5-5%;

[0025] Emulsifier 0.5-5%;

[0026] Oil-soluble skin conditioning agent 0.1-5%;

[0027] Flavor 0.01-1%.

[0028] As a preferred technical solution of the present invention, the humectant is at least one of xylitol glucoside, polyamino acid polysaccharide condensation products, carbohydrate isomers, acetylribosamine, and sodium polyglutamate; the polyol is at least one of glycerol, butylene glycol, propylene glycol, methylpropanediol, and 1,3-propanediol.

[0029] As a preferred technical solution of the present invention, the water-soluble skin conditioning agent is at least one of sugarcane extract, giant kelp extract, stephania tetrandra extract, milk thistle seed extract, red algae extract, elderberry fruit extract, Morinda officinalis extract, and caper fruit extract.

[0030] As a preferred technical solution of the present invention, the water-soluble sunscreen agent is at least one of disodium phenyl dibenzimidazole tetrasulfonate, terephthalylidene dicamphor sulfonates, phenylbenzimidazole sulfonic acid, and benzophenone-4.

[0031] As a preferred technical solution of the present invention, the water-soluble film-forming agent is at least one of VP / acrylic acid (ester) / lauryl methacrylate copolymer and polyvinyl pyrrolidone.

[0032] As a preferred technical solution of the present invention, the neutralizer is at least one of sodium hydroxide, potassium hydroxide, triethanolamine, and aminomethyl propanol; the preservative is at least one of phenoxyethanol, ethylhexylglycerin, p-hydroxyacetophenone, and caprylhydroxamic acid.

[0033] As a preferred technical solution of the present invention, the emollient is at least one of cyclopentasiloxane, cyclohexasiloxane, polydimethylsiloxane, and isododecane; and the kinematic viscosity of the polydimethylsiloxane is 5 mPa.s.

[0034] The oil-soluble film-forming agent is at least one of trimethylsiloxysilicate, VP / eicosene copolymer, and acrylic acid (ester) / polydimethylsiloxane copolymer.

[0035] As a preferred technical solution of the present invention, the oil-soluble sunscreen is at least one of polysilicone-15 and ethylhexyl methoxycinnamate; the emulsifier is at least one of PEG-10 polydimethylsiloxane, PEG-12 polydimethylsiloxane crosspolymer, and polydimethylsiloxane PEG-10 / 15 crosspolymer;

[0036] The oil-soluble skin conditioning agent is at least one of bisabolol, phytosterol oleate and tocopherol.

[0037] A method for preparing a transparent and waterproof film-forming sunscreen gel comprises the following steps:

[0038] Step 1, add deionized water into a water pot, stir and heat it to 65-70°C, add moisturizer, polyol, water-soluble skin conditioner, water-soluble sunscreen and water-soluble film-forming agent in sequence, disperse and dissolve them, and then cool them to 55-60°C;

[0039] Step 2, add the neutralizer into the water pot and adjust the pH of the water pot to 7.2-7.8, then add the preservative and disperse evenly to prepare the mixture A, and maintain the temperature at 55-60°C;

[0040] Step 3, add the emollient, emulsifier, oil-soluble sunscreen and oil-soluble film-forming agent into the main pot and stir evenly, then add the oil-soluble skin conditioner and stir evenly, and simultaneously raise the temperature to 55-60° C. to obtain a mixture B. Samples are taken for inspection. The appearance of the mixtures A and B are both transparent, and the difference in refractive index between the mixtures A and B is ≤0.002;

[0041] Step 4: Start stirring at 300-600rpm / 10min, slowly pump mixture A into mixture B, and control the pumping time to more than 30min. After completion, homogenize at 2500-2800rpm / 1-2min, cool to 38℃-42℃, and discharge after passing the test.

[0042] Compared with the prior art, the present invention has the following beneficial effects:

[0043] The invention can make the sunscreen gel transparent in appearance by adjusting the difference in refractive index between the water phase and the oil phase to be less than or equal to 0.002.

[0044] The present invention also found that by adding appropriate film-forming agents to the water phase and the oil phase respectively, the waterproof film-forming performance of the sunscreen gel can be greatly improved, and the initial sun protection index and the post-bath sun protection index are also greatly improved.

[0045] The present invention also finds that the sunscreen gel has good emulsification stability, maintains stable viscosity and transparency, and has excellent skin feel when used, is refreshing when applied, and has a strong water-dissolving feel.

[0046] The present invention combines chemical sunscreens with biological sunscreens, which can achieve better sunscreen effects and have higher SPF and PA sunscreen indexes. It can not only absorb ultraviolet rays, but also block or slow down tissue damage by removing or reducing intermediate products of oxygen active groups, thereby achieving indirect sunscreen effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 This is a schematic diagram of the preparation process of the present invention;

[0048] Figure 2 The following is a comparison diagram of the appearance of the embodiment of the present invention (left) and the comparative example (right);

[0049] Figure 3 It is a comparison diagram of the appearance of the embodiment of the present invention (top) and the comparative example (bottom). DETAILED DESCRIPTION

[0050] The present invention is further described below in conjunction with embodiments and comparative examples, but the present invention is not limited thereto.

[0051] Unless otherwise specified, the components, raw materials, reagents or devices involved in the embodiments and comparative examples of the present invention can be obtained from conventional commercial channels or can be obtained by existing known methods.

[0052] A sunscreen gel with a transparent appearance and waterproof film-forming property comprises a water phase component and an oil phase component, wherein both the water phase component and the oil phase component are transparent, and the difference in refractive index between the water phase component and the oil phase component is ≤0.002.

[0053] Examples 1 to 6

[0054] A sunscreen gel with a transparent appearance and waterproof film-forming properties, the weight percentages (%) of its components are shown in Table 1 below.

[0055] Table 1

[0056]

[0057]

[0058]

[0059]

[0060] like Figure 1 As shown, the preparation method of the gel of Examples 1 to 6 comprises the following steps:

[0061] (1) Add deionized water into a water pot, stir and heat it to 65-70° C., add moisturizer, polyol, water-soluble skin conditioner, water-soluble sunscreen and water-soluble film-forming agent in sequence, disperse and dissolve them, and then cool them to 55-60° C.;

[0062] (2) adding a neutralizer into a water pot and adjusting the pH of the water pot to 7.2-7.8, then adding a preservative and dispersing it evenly to prepare a mixture A, and maintaining the temperature at 55-60° C.;

[0063] (3) Adding the emollient, emulsifier, oil-soluble sunscreen and oil-soluble film-forming agent to the main pot and stirring evenly, then adding the oil-soluble skin conditioner and stirring evenly, and simultaneously raising the temperature to 55-60° C. to prepare a mixture B. Sampling and testing the appearance of mixture A and mixture B are both transparent, and the difference in refractive index between mixture A and mixture B is ≤0.002;

[0064] (4) Start stirring at 300-600rpm / 10min, slowly pump mixture A into mixture B, and control the pumping time to more than 30min. After completion, homogenize at 2500-2800rpm / 1-2min, cool to 38℃-42℃, and discharge after passing the test.

[0065] Comparative Example 1

[0066] A sunscreen gel with a transparent appearance and waterproof film-forming properties, the components of which are shown in Table 2 below.

[0067] Table 2

[0068]

[0069]

[0070] The preparation method of the product of this comparative example is the same as that of Examples 1 to 6.

[0071] Comparative Example 2

[0072] A sunscreen gel with a transparent appearance and waterproof film-forming properties, the components of which are shown in Table 3 below.

[0073] Table 3

[0074]

[0075]

[0076]

[0077] The preparation method of the product of this comparative example is the same as that of Examples 1 to 6.

[0078] Comparative Example 3

[0079] A sunscreen gel with a transparent appearance and waterproof film-forming properties, the components of which are shown in Table 4 below.

[0080] Table 4

[0081]

[0082]

[0083] The preparation method of the product of this comparative example is the same as that of Examples 1 to 6.

[0084] In the preparation process of the present invention, firstly, deionized water is put into a water pot, stirred and heated to 65-70° C., moisturizer, polyol, water-soluble skin conditioner, water-soluble sunscreen and water-soluble film-forming agent are added in sequence, dispersed and dissolved, and then cooled to 55-60° C. A neutralizer is added into the water pot and the pH of the water pot is adjusted to 7.2-7.8, and then a preservative is added and dispersed uniformly to prepare a mixture A, and the temperature is maintained at 55-60° C.

[0085] Add moisturizer, emulsifier, oil-soluble sunscreen and oil-soluble film-forming agent to the main pot and stir evenly, then add oil-soluble skin conditioner and stir evenly, and heat to 55-60°C simultaneously to obtain mixture B. Samples are taken to test that the appearance of mixture A and mixture B are both transparent, and the difference in refractive index between mixture A and mixture B is ≤0.002. Start stirring at 300-600rpm / 10min, slowly draw mixture A into mixture B, and control the drawing time to be more than 30min. After completion, homogenize at 2500-2800rpm / 1-2min, cool to 38°C-42°C, and discharge after passing the test. The present invention can make the appearance of sunscreen gel transparent by adjusting the difference in refractive index between the water phase and the oil phase to ≤0.002.

[0086] The present invention also found that by adding appropriate film-forming agents to the water phase and the oil phase respectively, the waterproof film-forming performance of the sunscreen gel can be greatly improved, and the initial sun protection index and the post-bath sun protection index are also greatly improved.

[0087] The present invention also finds that the sunscreen gel has good emulsification stability, maintains stable viscosity and transparency, and has excellent skin feel when used, is refreshing when applied, and has a strong water-dissolving feel.

[0088] The present invention combines chemical sunscreens with biological sunscreens, which can achieve better sunscreen effects and have higher SPF and PA sunscreen indexes. It can not only absorb ultraviolet rays, but also block or slow down tissue damage by removing or reducing intermediate products of oxygen active groups, thereby achieving indirect sunscreen effects.

[0089] Safety Testing:

[0090] Toxicology test: According to the toxicology test methods in Chapter 6 of the "Technical Specifications for Safety of Cosmetics" (2015 edition), multiple skin irritation tests, skin allergy tests and skin phototoxicity tests are carried out. If all three of the above items are passed, they are marked as +, and if any one item is not passed, it is marked as -.

[0091] Stability test:

[0092] The state of the composition was observed at room temperature 1 hour after manufacture, and no obvious sedimentation was found. Then the composition was placed at -18°C, -8°C, 4°C, 25°C, 40°C, and 45°C for 3 months to observe the stability. If the stability under all temperature conditions is excellent after three months, it is "√". If the stability under one or more temperature conditions fails, it is "×". If the composition has particle sedimentation and the material becomes turbid, it means that the stability fails.

[0093] Film uniformity test:

[0094] The sample was evenly coated on a polypropylene sheet, which was then exposed to a UV lamp and photographed. Film uniformity was evaluated on a scale of 1 to 5 based on the visual appearance of the coated sheet. If the appearance was uniformly black, it was rated 5 points; if the appearance was non-uniformly translucent, it was rated 1 point.

[0095] Efficacy test:

[0096] Determination of SPF value of sunscreen cosmetics: The determination method is the "Technical Specification for Safety of Cosmetics" (2015 Edition) Chapter 8 Human Efficacy Evaluation Test Method 2 Determination Method of Sunscreen Cosmetics Sun Protection Index (SPF Value)

[0097] Determination of the long-wave ultraviolet protection index (PFA value) of sunscreen cosmetics: The determination method is the "Technical Specification for Safety of Cosmetics" (2015 edition) Chapter 8 Human Efficacy Evaluation Test Method 4 Determination method of long-wave ultraviolet protection index (PFA value) of sunscreen cosmetics.

[0098] Waterproof test:

[0099] On a 5cm×5cm polymethyl methacrylate (PMMA) plate, the sample was evenly coated at 2mg / cm2 for 1 minute and dried at 25°C for 15 minutes. The PMMA plate was stirred in water at a moderate level for 20 minutes, and then removed from the water for 20 minutes (without wiping the PMMA plate). It was then placed in water and stirred at a moderate level for 20 minutes, removed from the water and dried naturally (without wiping the PMMA plate), and the SPF value was measured using an SPF meter. Based on the difference in the SPF values ​​before and after, the water resistance of the sample was scored on a scale of 1 to 5, with 5 points indicating an excellent waterproof effect and 1 point indicating almost no waterproof effect.

[0100] Or refer to Chapter 8 Human Efficacy Evaluation Test Method 3 of the "Technical Specifications for Safety of Cosmetics" (2015 Edition) for determination of waterproof performance of sunscreen cosmetics, and adopt the method for general sunscreen cosmetics.

[0101] Sensory test:

[0102] Skin feel test: 30 volunteers were selected, and each of them took 0.2mL of the sample and applied it on the skin for 10 circles. The spreadability was felt during the application process. Two minutes after use, the overall skin feel of greasy and heavy was felt. The higher the evaluation score, the better the skin feel characteristics. 1 point - very poor, 2 points - poor, 3 points - average, 4 points - good, 5 points - very good.

[0103] Test results:

[0104] The test results can be found in Table 2.

[0105] Table 5 Safety, stability, efficacy and waterproof test results:

[0106] Examples Toxicological experiments stability Waterproof SPF PFA After-bath sun protection value Example 1 + × 3.1 24.1 ++ 13.2 Example 2 + √ 5.0 32.9 ++ 28.9 Example 3 + √ 5.0 41.7 +++ 37.6 Example 4 + × 2.3 27.3 +++ 12.3 Example 5 + √ 4.2 14.4 + 10.7 Example 6 + √ 3.8 35.3 + 26.6 Comparative Example 1 + √ 4.8 37.1 ++ 32.0 Comparative Example 2 + √ 3.4 36.3 ++ 28.4 Comparative Example 3 + √ 3.4 33.4 ++ 24.2

[0107] Table 6 Sensory test results

[0108]

[0109]

[0110] Result analysis:

[0111] It can be known from the test results of the above Examples 1-6 and Comparative Examples 1-3 that, compared with Comparative Example 3, Examples 1-6 all add water-soluble skin conditioning agents, which can play a better sunscreen effect, not only absorbing ultraviolet rays, but also blocking or slowing down tissue damage by removing or reducing oxygen active group intermediates, thus playing an indirect sunscreen role. It can be seen from the above data that the water resistance, SPF value and PFA value of the gel prepared in Example 3 are greater than those of other examples, indicating that the film-forming agent, water-soluble skin conditioning agent, water-soluble sunscreen agent and oil-soluble sunscreen agent are compounded in a better ratio in the formula, which can play a synergistic effect, thereby preparing a sunscreen gel with a transparent appearance and waterproof film-forming.

[0112] After the skin feel test was carried out on the samples of the above embodiments and comparative examples, there was little difference in spreadability, lightness and overall skin feel between the embodiments and comparative examples. The optimization of skin feel is closely related to the use of the moisturizer, skin conditioner and emollient of the present invention. At the same time, the combination of the emulsifier of the present invention also plays an important role in reducing the thickness of the formula. The formula of the present invention overcomes the overly obvious thickness of the traditional oil-in-water dosage form, and the skin feel is better overall.

[0113] like Figure 2 , Figure 3As shown in the figure of the appearance state of the embodiment and the comparative example, it can be seen that the embodiment is more transparent than the comparative example. The above embodiment is a preferred embodiment of the present invention, but the embodiment of the present invention is not limited to the above embodiment. Any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principle of the present invention shall be equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. A transparent and waterproof film-forming sunscreen gel, characterized in that: The invention comprises an aqueous phase component and an oil phase component, wherein the aqueous phase component and the oil phase component are both transparent, and the difference in refractive index between the aqueous phase component and the oil phase component is ≤0.002; the aqueous phase is a mixture of a moisturizer, a polyol, a water-soluble skin conditioning agent, a water-soluble sunscreen agent, a water-soluble film-forming agent, a neutralizer, a preservative and deionized water; the oil phase is a mixture of an emollient, an oil-soluble film-forming agent, an oil-soluble sunscreen agent, an emulsifier, an oil-soluble skin conditioning agent and a fragrance; the aqueous phase and the oil phase are composed of the following mass percentages: Aqueous phase: Moisturizer 0.5-5%; Polyol 10-20%; Water-soluble skin conditioning agent 1.2-5%; Water-soluble sunscreen 3-15%; Water-soluble film-forming agent 0.5-5%; Neutralizer 1-5%; Preservatives 0.1-1%; Deionized water balance; Oil phase: Emollients 5-30%; Oil-soluble film-forming agent 0.5-5%; Oil-soluble sunscreen 0.5-5%; Emulsifier 0.5-5%; Oil-soluble skin conditioning agent 0.1-5%; Flavor 0.01-1%.

2. The sunscreen gel according to claim 1, characterized in that The moisturizer is at least one of xylitol-based glucoside, polyamino acid-polysaccharide condensation products, sugar isomers, acetylribosamine, and sodium polyglutamate; the polyol is at least one of glycerol, butylene glycol, propylene glycol, methylpropanediol, and 1,3-propylene glycol.

3. The sunscreen gel according to claim 1, characterized in that The water-soluble skin conditioning agent is at least one of sugarcane extract, giant kelp extract, stephania tetrandra extract, milk thistle seed extract, red algae extract, elderberry fruit extract, Morinda officinalis extract, and caper fruit extract.

4. The sunscreen gel according to claim 1, characterized in that The water-soluble sunscreen is at least one of disodium phenyl dibenzimidazole tetrasulfonate, terephthalylidene dicamphor sulfonate, phenylbenzimidazole sulfonic acid, and benzophenone-4.

5. The sunscreen gel according to claim 1, characterized in that: The water-soluble film-forming agent is at least one of VP / acrylic acid (ester) / lauryl methacrylate copolymer and polyvinyl pyrrolidone.

6. The sunscreen gel according to claim 1, characterized in that: The neutralizer is at least one of sodium hydroxide, potassium hydroxide, triethanolamine, and aminomethyl propanol; the preservative is at least one of phenoxyethanol, ethylhexylglycerin, p-hydroxyacetophenone, and caprylhydroxamic acid.

7. The sunscreen gel according to claim 1, characterized in that: The emollient is at least one of cyclopentasiloxane, cyclohexasiloxane, polydimethylsiloxane and isododecane; the kinematic viscosity of the polydimethylsiloxane is 5 mPa.s.

8. The sunscreen gel according to claim 1, characterized in that: The oil-soluble film-forming agent is at least one of trimethylsiloxysilicate, VP / eicosene copolymer, and acrylic acid (ester) / polydimethylsiloxane copolymer; the oil-soluble sunscreen agent is at least one of polysilicone-15 and ethylhexyl methoxycinnamate.

9. The sunscreen gel according to claim 1, characterized in that: The emulsifier is at least one of PEG-10 polydimethylsiloxane, PEG-12 polydimethylsiloxane cross-linked polymer, and polydimethylsiloxane PEG-10 / 15 cross-linked polymer; the oil-soluble skin conditioning agent is at least one of bisabolol, phytosteryl oleate, and tocopherol.

10. The method for preparing the sunscreen gel according to claim 1, comprising the following steps: Step 1, add deionized water into a water pot, stir and heat it to 65-70°C, add moisturizer, polyol, water-soluble skin conditioner, water-soluble sunscreen and water-soluble film-forming agent in sequence, disperse and dissolve them, and then cool them to 55-60°C; Step 2, add the neutralizer into the water pot and adjust the pH of the water pot to 7.2-7.8, then add the preservative and disperse evenly to prepare the mixture A, and maintain the temperature at 55-60°C; Step 3, add the emollient, emulsifier, oil-soluble sunscreen and oil-soluble film-forming agent into the main pot and stir evenly, then add the oil-soluble skin conditioner and stir evenly, and simultaneously raise the temperature to 55-60° C. to obtain a mixture B. Samples are taken for inspection. The appearance of the mixtures A and B are both transparent, and the difference in refractive index between the mixtures A and B is ≤0.002; Step 4: Start stirring at 300-600rpm / 10min, slowly pump mixture A into mixture B, and control the pumping time to more than 30min. After completion, homogenize at 2500-2800rpm / 1-2min, cool to 38℃-42℃, and discharge after passing the test.

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