Long-acting makeup-keeping film-forming composition and application thereof

Abstract

The invention relates to a long-acting makeup-keeping film-forming composition and application thereof, and belongs to the technical field of cosmetics. The long-acting makeup-keeping film-forming composition comprises the following raw materials: hydroxypropyl starch, polyesteride-5, vitamin C, cetyl alcohol ethyl hexanoate, nicotinamide, a radix gentianae extract and a stephania tetrandra extract, the components interact with one another to form a water-resistant film layer and have air permeability, the nicotinamide can effectively regulate and control the oily balance of skin, and the skin-care effect is good. In addition, the radix gentianae extract and the stephania tetrandra extract have a synergistic effect, the oxidation resistance is enhanced on the basis of the vitamin C, the base makeup is not prone to being oxidized and discolored, and then the duration of the makeup feeling is kept.

Description

Technical Field

[0001] The invention belongs to the technical field of cosmetics and relates to a long-lasting makeup film-forming composition and application thereof. Background Art

[0002] At present, liquid foundations on the market that are sold as long-lasting makeup often need to add a large amount of film-forming agents to improve the film-forming effect in order to achieve a long-lasting makeup effect. In addition, in order to increase the film-forming speed, a large amount of volatile oils need to be added, which makes it easy to cause problems such as dryness and floating powder during the makeup process. However, many liquid foundations on the market that claim to be highly moisturizing do not have a perfect design of moisturizing mechanisms and pathways, resulting in less than ideal results. Some products even add more moisturizing oils to improve moisturizing properties, making the skin feel thick and difficult to apply. Summary of the invention

[0003] The present invention relates to a long-lasting makeup film-forming composition and its application, belonging to the technical field of cosmetics. The long-lasting makeup film-forming composition disclosed in the present invention includes raw materials such as hydroxypropyl starch, polyester-5, vitamin C, cetyl ethylhexanoate, niacinamide, gentian root extract, and stephania tetrandra extract. The components interact with each other to form a water-resistant film layer and have air permeability. Among them, niacinamide can effectively regulate and control the oil balance of the skin and enhance the duration of makeup. In addition, the gentian root extract and stephania tetrandra extract work synergistically, and the antioxidant property is enhanced on the basis of vitamin C, so that the base makeup is not easy to oxidize and discolor, thereby maintaining the duration of makeup.

[0004] The purpose of the present invention can be achieved through the following technical solutions:

[0005] A long-lasting film-forming composition, comprising the following raw materials in parts by weight: 2-5 parts of hydroxypropyl starch, 150-180 parts of polyester-5, 5-15 parts of vitamin C, 8-15 parts of cetyl ethylhexanoate, 10-40 parts of niacinamide, 0.04-0.08 parts of gentian root extract, and 0.01-0.08 parts of stephania tetrandra extract.

[0006] Furthermore, the preparation method of the gentian root extract comprises the following steps:

[0007] (1) grinding the dried gentian root into powder, soaking it in methanol, and then heating and refluxing it for extraction three times, and concentrating the extract under reduced pressure to recover the methanol to obtain a concentrated solution;

[0008] (2) Distilled water is added to the concentrate and mixed, and then an extractant is added for extraction. The extract is eluted through a chromatographic column and dried to obtain the gentian root extract.

[0009] Furthermore, in the step (1), the solid-liquid ratio of the powder to methanol is 5 g:500-800 mL, and the soaking time is 20-30 h.

[0010] Furthermore, the extraction time and temperature in step (1) are 1.5-2h and 80-90°C respectively, and the pressure of the reduced pressure concentration is 0.08-0.1MPa.

[0011] Furthermore, in step (2), the volume ratio of the concentrate, distilled water and the extractant is 1:2-3:3, wherein the extractant is petroleum ether, and the drying temperature and time are 70-80° C. and 10-15 min, respectively.

[0012] Furthermore, the preparation method of the Tetrandrakia tetrandra extract comprises the following steps:

[0013] A1: Powdered Stephania tetrandra powder was mixed with distilled water, allowed to stand, and then filtered. The filtrate was centrifuged and the supernatant was removed by rotary evaporation to obtain a concentrated solution a.

[0014] A2: Add anhydrous ethanol to the concentrated solution a, seal and refrigerate, filter after forming a precipitate, and dry the solid to obtain the Stephania tetrandra extract.

[0015] Furthermore, in the step A1, the solid-liquid ratio of the Stephania tetrandra powder to distilled water is 1 g:25 mL, the standing time and temperature are 24 h and 30-50° C., respectively, and the speed and time of the centrifugal separation are 4000 r / min and 10-20 min, respectively.

[0016] Furthermore, in step A2, the volume ratio of the concentrated solution a to anhydrous ethanol is 1:1, the refrigeration time and temperature are 10-12 h and 3-5° C. respectively, and the drying temperature is 60-70° C.

[0017] Beneficial effects of the present invention:

[0018] 1. The present invention can form a water-resistant film layer through the interaction between the components, and has air permeability and skin-fitting properties. Among them, niacinamide can effectively regulate and control the oil balance of the skin and enhance the duration of makeup. In addition, the gentian root extract and the stephania tetrandra extract synergistically enhance the antioxidant properties on the basis of vitamin C, making the base makeup less likely to oxidize and discolor, thereby maintaining the makeup effect for a long time. DETAILED DESCRIPTION

[0019] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation methods, structures, features and effects of the present invention are described in detail below in combination with embodiments.

[0020] Example 1

[0021] A long-lasting film-forming composition, comprising the following raw materials in parts by weight: 2 parts of hydroxypropyl starch, 160 parts of polyester-5, 10 parts of vitamin C, 13 parts of cetyl ethylhexanoate, 20 parts of niacinamide, 0.04 parts of gentian root extract, and 0.025 parts of stephania tetrandra extract.

[0022] The preparation method of the gentian root extract comprises the following steps:

[0023] (1) grinding the dried gentian root into powder, soaking it in methanol, and then heating and refluxing it for extraction three times, and concentrating the extract under reduced pressure to recover the methanol to obtain a concentrated solution;

[0024] (2) Distilled water is added to the concentrate and mixed, and then an extractant is added for extraction. The extract is eluted through a chromatographic column and dried to obtain the gentian root extract.

[0025] In the step (1), the solid-to-liquid ratio of the powder to methanol is 5 g:500 mL, and the soaking time is 20 h.

[0026] The extraction time and temperature in step (1) are 1.5 h and 80° C. respectively, the pressure of the reduced pressure concentration is 0.08 MPa, and the reduced pressure concentration is to 1 / 5 of the original volume.

[0027] In the step (2), the volume ratio of the concentrate, distilled water and the extractant is 1:2:3, wherein the extractant is petroleum ether, the drying temperature and time are 70° C. and 10 min respectively, and the model of the chromatographic column is HDAC-15.

[0028] The preparation method of the Tetrandrakia tetrandra extract comprises the following steps:

[0029] A1: Powdered Stephania tetrandra powder was mixed with distilled water, allowed to stand, and then filtered. The filtrate was centrifuged and the supernatant was removed by rotary evaporation to obtain a concentrated solution a.

[0030] A2: Add anhydrous ethanol to the concentrated solution a, seal and refrigerate, filter after forming a precipitate, and dry the solid to obtain the Stephania tetrandra extract.

[0031] In the step A1, the solid-liquid ratio of Stephania tetrandra powder to distilled water is 1 g:25 mL, the standing time and temperature are 24 h and 30° C., the speed and time of the centrifugal separation are 4000 r / min and 10 min, and the volume concentration of the concentrated solution a is 85%.

[0032] In the step A2, the volume ratio of the concentrated solution a to anhydrous ethanol is 1:1, the refrigeration time and temperature are 10 h and 3° C. respectively, and the drying temperature is 60° C.

[0033] The vitamin C is 3-o-ethyl ascorbic acid, and cetyl ethylhexanoate was purchased from Guangzhou Hefu Chemical Technology Co., Ltd.

[0034] Example 2

[0035] A long-lasting film-forming composition, comprising the following raw materials in parts by weight: 2.5 parts of hydroxypropyl starch, 165 parts of polyester-5, 11 parts of vitamin C, 14 parts of cetyl ethylhexanoate, 21 parts of niacinamide, 0.042 parts of gentian root extract, and 0.028 parts of stephania tetrandra extract.

[0036] The preparation method of the gentian root extract comprises the following steps:

[0037] (1) grinding the dried gentian root into powder, soaking it in methanol, and then heating and refluxing it for extraction three times, and concentrating the extract under reduced pressure to recover the methanol to obtain a concentrated solution;

[0038] (2) Distilled water is added to the concentrate and mixed, and then an extractant is added for extraction. The extract is eluted through a chromatographic column and dried to obtain the gentian root extract.

[0039] In the step (1), the solid-to-liquid ratio of the powder to methanol is 5 g:650 mL, and the soaking time is 25 h.

[0040] The extraction time and temperature in step (1) are 1.5 h and 85° C. respectively, the pressure of the reduced pressure concentration is 0.09 MPa, and the reduced pressure concentration is to 1 / 5 of the original volume.

[0041] In the step (2), the volume ratio of the concentrate, distilled water and the extractant is 1:2.5:3, wherein the extractant is petroleum ether, the drying temperature and time are 75° C. and 12 min respectively, and the model of the chromatographic column is HDAC-15.

[0042] The preparation method of the Tetrandrakia tetrandra extract comprises the following steps:

[0043] A1: Powdered Stephania tetrandra powder was mixed with distilled water, allowed to stand, and then filtered. The filtrate was centrifuged and the supernatant was removed by rotary evaporation to obtain a concentrated solution a.

[0044] A2: Add anhydrous ethanol to the concentrated solution a, seal and refrigerate, filter after forming a precipitate, and dry the solid to obtain the Stephania tetrandra extract.

[0045] In the step A1, the solid-liquid ratio of Stephania tetrandra powder to distilled water is 1 g:25 mL, the standing time and temperature are 24 h and 40° C., the speed and time of the centrifugal separation are 4000 r / min and 15 min, and the volume concentration of the concentrated solution a is 85%.

[0046] In the step A2, the volume ratio of the concentrated solution a to anhydrous ethanol is 1:1, the refrigeration time and temperature are 11 h and 4° C. respectively, and the drying temperature is 65° C.

[0047] The vitamin C is 3-o-ethyl ascorbic acid, and cetyl ethylhexanoate was purchased from Guangzhou Hefu Chemical Technology Co., Ltd.

[0048] Example 3

[0049] A long-lasting film-forming composition, comprising the following raw materials in parts by weight: 3 parts of hydroxypropyl starch, 170 parts of polyester-5, 12 parts of vitamin C, 15 parts of cetyl ethylhexanoate, 22 parts of niacinamide, 0.045 parts of gentian root extract, and 0.03 parts of stephania tetrandra extract.

[0050] The preparation method of the gentian root extract comprises the following steps:

[0051] (1) grinding the dried gentian root into powder, soaking it in methanol, and then heating and refluxing it for extraction three times, and concentrating the extract under reduced pressure to recover the methanol to obtain a concentrated solution;

[0052] (2) Distilled water is added to the concentrate and mixed, and then an extractant is added for extraction. The extract is eluted through a chromatographic column and dried to obtain the gentian root extract.

[0053] In the step (1), the solid-to-liquid ratio of the powder to methanol is 5 g:800 mL, and the soaking time is 30 h.

[0054] The extraction time and temperature in step (1) are 2 h and 90° C. respectively, the pressure of the reduced pressure concentration is 0.1 MPa, and the reduced pressure concentration is reduced to 1 / 5 of the original volume.

[0055] In the step (2), the volume ratio of the concentrate, distilled water and the extractant is 1:3:3, wherein the extractant is petroleum ether, the drying temperature and time are 80° C. and 15 min, respectively, and the model of the chromatographic column is HDAC-15.

[0056] The preparation method of the Tetrandrakia tetrandra extract comprises the following steps:

[0057] A1: Powdered Stephania tetrandra powder was mixed with distilled water, allowed to stand, and then filtered. The filtrate was centrifuged and the supernatant was removed by rotary evaporation to obtain a concentrated solution a.

[0058] A2: Add anhydrous ethanol to the concentrated solution a, seal and refrigerate, filter after forming a precipitate, and dry the solid to obtain the Stephania tetrandra extract.

[0059] In the step A1, the solid-liquid ratio of Stephania tetrandra powder to distilled water is 1 g:25 mL, the standing time and temperature are 24 h and 50° C., the speed and time of the centrifugal separation are 4000 r / min and 20 min, and the volume concentration of the concentrated solution a is 85%.

[0060] In the step A2, the volume ratio of the concentrated solution a to the anhydrous ethanol is 1:1, the refrigeration time and temperature are 12 h and 5° C. respectively, and the drying temperature is 70° C.

[0061] The vitamin C is 3-o-ethyl ascorbic acid, and cetyl ethylhexanoate was purchased from Guangzhou Hefu Chemical Technology Co., Ltd.

[0062] Comparative Example 1

[0063] On the basis of Example 3, a long-lasting film-forming composition is provided, which comprises the following raw materials in parts by weight: 3 parts of hydroxypropyl starch, 170 parts of polyester-5, 12 parts of vitamin C, 15 parts of cetyl ethylhexanoate, 0.045 parts of gentian root extract, and 0.03 parts of stephania tetrandra extract.

[0064] The preparation method of the gentian root extract comprises the following steps:

[0065] (1) grinding the dried gentian root into powder, soaking it in methanol, and then heating and refluxing it for extraction three times, and concentrating the extract under reduced pressure to recover the methanol to obtain a concentrated solution;

[0066] (2) Distilled water is added to the concentrate and mixed, and then an extractant is added for extraction. The extract is eluted through a chromatographic column and dried to obtain the gentian root extract.

[0067] In the step (1), the solid-to-liquid ratio of the powder to methanol is 5 g:800 mL, and the soaking time is 30 h.

[0068] The extraction time and temperature in step (1) are 2 h and 90° C. respectively, the pressure of the reduced pressure concentration is 0.1 MPa, and the reduced pressure concentration is reduced to 1 / 5 of the original volume.

[0069] In the step (2), the volume ratio of the concentrate, distilled water and the extractant is 1:3:3, wherein the extractant is petroleum ether, the drying temperature and time are 80° C. and 15 min, respectively, and the model of the chromatographic column is HDAC-15.

[0070] The preparation method of the Tetrandrakia tetrandra extract comprises the following steps:

[0071] A1: Powdered Stephania tetrandra powder was mixed with distilled water, allowed to stand, and then filtered. The filtrate was centrifuged and the supernatant was removed by rotary evaporation to obtain a concentrated solution a.

[0072] A2: Add anhydrous ethanol to the concentrated solution a, seal and refrigerate, filter after forming a precipitate, and dry the solid to obtain the Stephania tetrandra extract.

[0073] In the step A1, the solid-liquid ratio of Stephania tetrandra powder to distilled water is 1 g:25 mL, the standing time and temperature are 24 h and 50° C., the speed and time of the centrifugal separation are 4000 r / min and 20 min, and the volume concentration of the concentrated solution a is 85%.

[0074] In the step A2, the volume ratio of the concentrated solution a to the anhydrous ethanol is 1:1, the refrigeration time and temperature are 12 h and 5° C. respectively, and the drying temperature is 70° C.

[0075] The vitamin C is 3-o-ethyl ascorbic acid, and cetyl ethylhexanoate was purchased from Guangzhou Hefu Chemical Technology Co., Ltd.

[0076] Comparative Example 2

[0077] On the basis of Example 3, a long-lasting film-forming composition is provided, which comprises the following raw materials in parts by weight: 3 parts of hydroxypropyl starch, 170 parts of polyester-5, 12 parts of vitamin C, 15 parts of cetyl ethylhexanoate, 22 parts of niacinamide, and 0.075 parts of Stephania tetrandra extract.

[0078] The preparation method of the Tetrandrakia tetrandra extract comprises the following steps:

[0079] A1: Powdered Stephania tetrandra powder was mixed with distilled water, allowed to stand, and then filtered. The filtrate was centrifuged and the supernatant was removed by rotary evaporation to obtain a concentrated solution a.

[0080] A2: Add anhydrous ethanol to the concentrated solution a, seal and refrigerate, filter after forming a precipitate, and dry the solid to obtain the Stephania tetrandra extract.

[0081] In the step A1, the solid-liquid ratio of Stephania tetrandra powder to distilled water is 1 g:25 mL, the standing time and temperature are 24 h and 50° C., the speed and time of the centrifugal separation are 4000 r / min and 20 min, and the volume concentration of the concentrated solution a is 85%.

[0082] In the step A2, the volume ratio of the concentrated solution a to the anhydrous ethanol is 1:1, the refrigeration time and temperature are 12 h and 5° C. respectively, and the drying temperature is 70° C.

[0083] The vitamin C is 3-o-ethyl ascorbic acid, and cetyl ethylhexanoate was purchased from Guangzhou Hefu Chemical Technology Co., Ltd.

[0084] Comparative Example 3

[0085] On the basis of Example 3, a long-lasting film-forming composition is provided, which comprises the following raw materials in parts by weight: 3 parts of hydroxypropyl starch, 170 parts of polyester-5, 12 parts of vitamin C, 15 parts of cetyl ethylhexanoate, 22 parts of niacinamide, and 0.075 parts of gentian root extract.

[0086] The preparation method of the gentian root extract comprises the following steps:

[0087] (1) grinding the dried gentian root into powder, soaking it in methanol, and then heating and refluxing it for extraction three times, and concentrating the extract under reduced pressure to recover the methanol to obtain a concentrated solution;

[0088] (2) Distilled water is added to the concentrate and mixed, and then an extractant is added for extraction. The extract is eluted through a chromatographic column and dried to obtain the gentian root extract.

[0089] In the step (1), the solid-to-liquid ratio of the powder to methanol is 5 g:800 mL, and the soaking time is 30 h.

[0090] The extraction time and temperature in step (1) are 2 h and 90° C. respectively, the pressure of the reduced pressure concentration is 0.1 MPa, and the reduced pressure concentration is reduced to 1 / 5 of the original volume.

[0091] In the step (2), the volume ratio of the concentrate, distilled water and the extractant is 1:3:3, wherein the extractant is petroleum ether, the drying temperature and time are 80° C. and 15 min, respectively, and the model of the chromatographic column is HDAC-15.

[0092] The vitamin C is 3-o-ethyl ascorbic acid, and cetyl ethylhexanoate was purchased from Guangzhou Hefu Chemical Technology Co., Ltd.

[0093] Comparative Example 4

[0094] On the basis of Example 3, on the basis of Example 3, a long-lasting film-forming composition is provided, which comprises the following raw materials in parts by weight: 3 parts of hydroxypropyl starch, 170 parts of polyester-5, 15 parts of cetyl ethylhexanoate, 22 parts of niacinamide, and 12.075 parts of gentian root extract.

[0095] The preparation method of the gentian root extract comprises the following steps:

[0096] (1) grinding the dried gentian root into powder, soaking it in methanol, and then heating and refluxing it for extraction three times, and concentrating the extract under reduced pressure to recover the methanol to obtain a concentrated solution;

[0097] (2) Distilled water is added to the concentrate and mixed, and then an extractant is added for extraction. The extract is eluted through a chromatographic column and dried to obtain the gentian root extract.

[0098] In the step (1), the solid-to-liquid ratio of the powder to methanol is 5 g:800 mL, and the soaking time is 30 h.

[0099] The extraction time and temperature in step (1) are 2 h and 90° C. respectively, the pressure of the reduced pressure concentration is 0.1 MPa, and the reduced pressure concentration is reduced to 1 / 5 of the original volume.

[0100] In the step (2), the volume ratio of the concentrate, distilled water and the extractant is 1:3:3, wherein the extractant is petroleum ether, the drying temperature and time are 80° C. and 15 min, respectively, and the model of the chromatographic column is HDAC-15.

[0101] The cetyl alcohol ethylhexanoate was purchased from Guangzhou Hefu Chemical Technology Co., Ltd.

[0102] 1. Performance Testing

[0103] The film-forming composition obtained in Examples 1-3 and Comparative Examples 1-3 was mixed with an atomization improver in a ratio of 5:1 to prepare a makeup setting spray and used as a sample, wherein the atomization improver consisted of PPG-26-butanol polyether 26, bis-diethoxydiglycol cyclohexane 1,4-dicarboxylate and PEG-40 hydrogenated castor oil in a mass ratio of 1:1:1.

[0104] 80 female volunteers aged 25-35 who met the test requirements were selected as subjects. After applying the foundation on the face, the subjects sprayed the same amount of different samples and used them for 14 consecutive days. The makeup was observed after applying the foundation on the 14th day and 8 hours after applying the foundation. Test scoring rules: 5-point system, based on the makeup effect of the foundation after applying it on the face and the durability of the makeup after 8 hours, the comprehensive score is given. The evaluation criteria are shown in Table 1. The subjects scored according to Table 1, and finally all the scores were counted to calculate the average value.

[0105] Table 1 Evaluation criteria

[0106]

[0107] The above test results are shown in Table 1:

[0108] Table 1 Test results

[0109]

[0110]

[0111] As can be seen from Table 1, the makeup effect scores and makeup lasting scores of Examples 1-3 are greater than those of Comparative Examples 1-3, among which Comparative Example 1 has the lowest makeup effect score. Comparative Example 1 does not add niacinamide, and its skin adhesion is reduced. At the same time, its oil balance is broken over time, and the makeup lasting score is reduced; Comparative Examples 2-4 remove one of the gentian root extract, the stephensi extract, and vitamin C. Due to the decrease in antioxidant effect, its makeup lasting score is also reduced, and the skin adhesion is also affected, so the makeup effect is also worse than that of the examples.

[0112] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A long-lasting makeup film-forming composition, characterized in that: The long-lasting makeup film-forming composition comprises the following raw materials in parts by weight: 2-5 parts of hydroxypropyl starch, 150-180 parts of polyester-5, 5-15 parts of vitamin C, 8-15 parts of cetyl ethylhexanoate, 10-40 parts of niacinamide, 0.04-0.08 parts of gentian root extract, and 0.01-0.08 parts of stephania tetrandra extract.

2. A long-lasting makeup film-forming composition according to claim 1, characterized in that: The preparation method of the gentian root extract comprises the following steps: (1) grinding the dried gentian root into powder, soaking it in methanol, and then heating and refluxing it for extraction three times, and concentrating the extract under reduced pressure to recover the methanol to obtain a concentrated solution; (2) Distilled water is added to the concentrate and mixed, and then an extractant is added for extraction. The extract is eluted through a chromatographic column and dried to obtain the gentian root extract.

3. A long-lasting makeup film-forming composition according to claim 2, characterized in that: In the step (1), the solid-liquid ratio of the powder to methanol is 5 g:500-800 mL, and the soaking time is 20-30 h.

4. The long-lasting makeup film-forming composition according to claim 2, characterized in that: The extraction time and temperature in step (1) are 1.5-2h and 80-90°C respectively, and the pressure of the reduced pressure concentration is 0.08-0.1MPa.

5. The long-lasting makeup film-forming composition according to claim 2, characterized in that: In the step (2), the volume ratio of the concentrate, distilled water and the extractant is 1:2-3:3, wherein the extractant is petroleum ether, and the drying temperature and time are 70-80° C. and 10-15 min, respectively.

6. The long-lasting makeup film-forming composition according to claim 1, characterized in that: The preparation method of the Tetrandrakia tetrandra extract comprises the following steps: A1: Powdered Stephania tetrandra powder was mixed with distilled water, allowed to stand, and then filtered. The filtrate was centrifuged and the supernatant was removed by rotary evaporation to obtain a concentrated solution a. A2: Add anhydrous ethanol to the concentrated solution a, seal and refrigerate, filter after forming a precipitate, and dry the solid to obtain the Stephania tetrandra extract.

7. The long-lasting makeup film-forming composition according to claim 6, characterized in that: In the step A1, the solid-liquid ratio of Stephania tetrandra powder to distilled water is 1 g:25 mL, the standing time and temperature are 24 h and 30-50° C., respectively, and the speed and time of the centrifugal separation are 4000 r / min and 10-20 min, respectively.

8. The long-lasting makeup film-forming composition according to claim 6, characterized in that: In the step A2, the volume ratio of the concentrated solution a to the anhydrous ethanol is 1:1, the refrigeration time and temperature are 10-12 hours and 3-5° C. respectively, and the drying temperature is 60-70° C.

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