Waterproof and antibacterial soft air cushion powder puff and preparation method thereof

Abstract

The present invention belongs to the technical field of powder puffs, and specifically relates to a water-proof and antibacterial soft air cushion powder puff and a preparation method thereof. The water-proof and antibacterial soft air cushion powder puff comprises a sponge, a film layer A, a barrier layer, a film layer B and a powder puff layer from the inside to the outside; the material of the barrier layer is a TPU film, and the TPU film comprises the following components in parts by weight: 50-60 parts of modified TPU, 20-30 parts of PEBA and 1.25-1.45 parts of a compatibilizer. The modified TPU is prepared by mixing 100 parts by weight of TPU and 4-8 parts by weight of polyester-coated nano titanium dioxide, and melt-extruding. The water-proof and antibacterial soft air cushion powder puff prepared by the present invention has good antibacterial and waterproof effects and strong water washability. Due to the use of a stamping molding process, the air cushion powder puff prepared by the present invention can make the edge of the powder puff smoother and more natural, without obvious cutting marks or hard edges.

Description

Technical Field

[0001] The invention belongs to the technical field of powder puffs, and particularly relates to a water-proof and antibacterial soft air cushion powder puff and a preparation method thereof. Background Art

[0002] A cushion powder puff is a makeup tool specifically designed for use with BB cream, CC cream, or other liquid or emulsion-based makeup. It typically has a soft, delicate texture that helps evenly apply and pat makeup for a more natural, flawless finish.

[0003] TPU (thermoplastic polyurethane) is known for its exceptional flexibility and resilience, making it ideal for items that require frequent bending and compression, such as air cushion powder puffs. TPU is often used as a barrier layer in air cushion powder puffs, primarily to provide waterproofing and necessary mechanical support. Despite its many excellent properties, TPU itself falls short of the ideal antibacterial and washability standards for high-quality powder puffs.

[0004] Chinese patent publication number CN117844232B discloses a high-performance polyether TPU film and a preparation method thereof. The polyether TPU film has the advantages of good aging resistance, air permeability, antibacterial property, water resistance, waterproofness, tear resistance, and excellent mechanical properties. Summary of the Invention

[0005] The purpose of the present invention is to provide a water-proof and antibacterial soft air cushion powder puff and a preparation method thereof.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A water-proof and antibacterial soft air cushion powder puff, which comprises, from the inside to the outside, a sponge, a film layer A, a barrier layer, a film layer B, and a puff layer; the sponge and the barrier layer are bonded via the film layer A, and the barrier layer and the puff layer are bonded via the film layer B.

[0008] The barrier layer is made of a TPU film, which includes the following components in parts by weight: 50-60 parts of modified TPU, 20-30 parts of PEBA (polyether block amide), and 1.25-1.45 parts of a compatibilizer.

[0009] The modified TPU is prepared by mixing 100 parts by weight of TPU and 4-8 parts by weight of polyester-coated nano-titanium dioxide, and then melt-extruding.

[0010] The polyester-coated nano-titanium dioxide is prepared by mixing nano-titanium dioxide, diethyl terephthalate, propylene glycol and tetrabutyl titanate and then heating the mixture for reaction.

[0011] The molar ratio of the nano titanium dioxide, diethyl terephthalate, propylene glycol and tetrabutyl titanate is 3: (1.0-1.3): (2.4-2.7): (0.01-0.03).

[0012] The preparation method of the modified TPU comprises the following steps:

[0013] (1) Nano-titanium dioxide, diethyl terephthalate, propylene glycol, and tetrabutyl titanate were mixed, heated to 145-150° C., stirred for 30-40 min, then heated to 220-240° C., reacted for 1.5-2 h, and then heated to 270-280° C., reacted under vacuum for 1-2 h; the product was washed with phenol, centrifuged, and vacuum-dried to obtain polyester-coated nano-titanium dioxide;

[0014] (2) Thermoplastic polyurethane elastomer and polyester-coated nano-titanium dioxide are mixed and extruded through a twin-screw extruder to obtain modified TPU.

[0015] The present invention improves the antibacterial property of the powder puff by adding nano-titanium dioxide to TPU. The present invention uses diethyl terephthalate and propylene glycol to polymerize on the surface of the nano-titanium dioxide under the action of a catalyst to coat the polyester, which can improve the dispersibility of the nano-titanium dioxide in the system and improve the tensile strength of the TPU film.

[0016] Furthermore, the extrusion temperature of the twin-screw extruder is 180-230° C., and the screw speed is 200-250 r / min.

[0017] Furthermore, the temperatures of each section of the screw extruder are 190°C, 220°C, 220°C, 220°C, 220°C, 200°C, 200°C, 190°C, and 190°C, the head temperature is 190°C, and the screw speed is set to 220r / min.

[0018] Furthermore, the thermoplastic polyurethane elastomer has an elongation at break of 650-700% and a tear strength of 90-100 kN / m.

[0019] Furthermore, the thermoplastic polyurethane elastomer has an elongation at break of 650% and a tear strength of 95 kN / m.

[0020] The thermoplastic polyurethane elastomer can be commercially available or prepared by conventional methods. The commercially available thermoplastic polyurethane elastomer can be purchased from BASF, Germany, model 585A.

[0021] Furthermore, PEBA was purchased from Arkema, France, with the brand name Pebax2533SA01.

[0022] Furthermore, the compatibilizer is MAH-g-SEBS, the melt index at 230° C. / 5 kg is 36 to 43 g / 10 min, and the styrene content is 12 to 16 wt %.

[0023] Furthermore, the compatibilizer is MAH-g-SEBS, the melt index at 230° C. / 5 kg is 40 g / 10 min, and the styrene content is 13 wt %.

[0024] MAH-g-SEBS can be commercially available or prepared by conventional methods. Commercially available MAH-g-SEBS can be purchased from Kraton Corporation, USA, model number Kraton FG1924G.

[0025] By adding PEBA and a compatibilizer to the modified TPU, the three components work synergistically to improve the tear resistance of the TPU film and reduce its moisture permeability. Furthermore, using specific types of TPU, PEBA, and compatibilizer creates a uniform and stable blend, resulting in a more evenly distributed dispersed phase and enhanced interfacial affinity between the two phases, ultimately improving the overall performance of the TPU film.

[0026] The preparation method of the TPU film comprises the following steps: mixing modified TPU, PEBA, and a compatibilizer, stirring at a speed of 350 rpm and a temperature of 55° C. for 15 minutes to obtain a mixture; transferring the mixture into a twin-screw extruder for melt extrusion, granulation, and finally blowing the mixture into a film using a film blowing machine to obtain a TPU film with a thickness of 0.015-0.1 mm;

[0027] Furthermore, the temperatures of each zone of the twin-screw extruder from the feeding port to the die are: zone 1 temperature 195-215°C, zone 2 temperature 210-230°C, zone 3 temperature 230-240°C, zone 4 temperature 240-250°C, zone 5 temperature 245-250°C, zone 6 temperature 235-250°C, zone 7 temperature 240-250°C, die head temperature 240-250°C, and the rotation speed is 150rpm / min.

[0028] Furthermore, the thickness of the adhesive film layer A is 0.015-0.1 mm.

[0029] Furthermore, the powder puff layer includes polyurethane, latex, non-latex, cotton, polyester, acrylic or nylon.

[0030] Furthermore, the thickness of the adhesive film layer B is 0.020-0.030 mm.

[0031] Furthermore, the adhesive film layer A and the adhesive film layer B are thermoplastic polyurethane elastic rubber.

[0032] The present invention provides a method for preparing a water-proof and antibacterial soft air cushion powder puff, comprising the following steps:

[0033] (1) Cut the sponge, film layer A, barrier layer, film layer B, and puff layer to target sizes respectively;

[0034] (2) hot pressing the adhesive film layer A on the surface of the sponge;

[0035] (3) thermally pressing a barrier layer onto the outer surface of the film layer A;

[0036] (4) hot pressing the adhesive film layer B on the outer surface of the barrier layer;

[0037] (5) hot pressing the puff layer on the surface of the film layer B to obtain an intermediate product;

[0038] (6) The intermediate product is heated a second time and cooled at room temperature to obtain the primary product;

[0039] (7) The primary product is placed in a mold and punched, cut, and formed using a punching machine to obtain a water-proof and antibacterial soft air cushion powder puff.

[0040] The press pressure is 10T, one puff can be punched at a time, the table is 800*800mm, the opening is 200mm, the stroke is 130mm, the downward speed is 120mm / s, and the return speed is 60mm / s.

[0041] The mold is made of steel with a hardness of 30-43 and a blade width of 10-20C.

[0042] Compared with the prior art, the advantages and beneficial effects of the present invention are:

[0043] 1. The present invention improves the antibacterial property of the powder puff by adding nano-titanium dioxide to TPU. The present invention uses diethyl terephthalate and propylene glycol to polymerize on the surface of nano-titanium dioxide under the action of a catalyst to coat polyester, which can improve the dispersibility of nano-titanium dioxide in the system and improve the tensile strength of the TPU film.

[0044] 2. The present invention adds PEBA and a compatibilizer to the modified TPU, and the three have a synergistic effect, which can improve the tear resistance of the TPU film and reduce the moisture permeability of the film.

[0045] 3. The air cushion powder puff produced by the present invention utilizes a stamping process, resulting in a smoother, more natural-looking edge without noticeable cut marks or hard edges, thus avoiding discomfort or even the risk of cuts during use. The multi-layered structure not only enhances the product's functionality (waterproof and antibacterial), but also provides a softer feel and user experience, reducing the possibility of discomfort caused by skin contact. This water-proof and antibacterial soft air cushion powder puff, with its unique manufacturing process and carefully selected materials, significantly enhances the user experience while ensuring functionality. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 Schematic diagram of the mold used in the present invention. DETAILED DESCRIPTION

[0047] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0048] The equipment and raw materials used in the present invention are all commercially available products:

[0049] The adhesive film layer A and the adhesive film layer B are thermoplastic polyurethane elastic rubber purchased from Zhejiang Huafeng Thermoplastic Polyurethane Co., Ltd., model HF-1070AP.

[0050] Example 1

[0051] This embodiment provides a water-proof and antibacterial soft air cushion powder puff, which comprises, from the inside to the outside, a sponge, a film layer A, a barrier layer, a film layer B, and a puff layer; the sponge and the barrier layer are bonded by the film layer A, and the barrier layer and the puff layer are bonded by the film layer B;

[0052] The thickness of the adhesive film layer A is 0.05 mm.

[0053] The thickness of the adhesive film layer B is 0.025 mm.

[0054] The powder puff layer is made of acrylic fiber.

[0055] The barrier layer is made of a TPU film comprising the following components by weight: 57 parts modified TPU, 24 parts PEBA, and 1.3 parts compatibilizer. PEBA was purchased from Arkema, France, with the brand name Pebax 2533SA01.

[0056] The compatibilizer is MAH-g-SEBS, which is purchased from Kraton Corporation of the United States, model number Kraton FG1924G.

[0057] The preparation method of the modified TPU comprises the following steps:

[0058] (1) Nano-titanium dioxide, diethyl terephthalate, 1,2-propylene glycol, and tetrabutyl titanate in a molar ratio of 3:1.2:2.5:0.02 were mixed, heated to 145°C, stirred for 40 minutes, then heated to 230°C, reacted for 1.7 hours, and then heated to 275°C, reacted under vacuum for 1.5 hours; the product was washed with phenol, centrifuged, and vacuum dried to obtain polyester-coated nano-titanium dioxide;

[0059] (2) 100 parts by weight of a thermoplastic polyurethane elastomer and 6 parts by weight of polyester-coated nano-titanium dioxide were mixed, wherein the thermoplastic polyurethane elastomer had an elongation at break of 650% and a tear strength of 95 kN / m and was purchased from BASF, Germany, model 585A; the mixture was extruded through a twin-screw extruder, and the temperatures of each section of the screw extruder were 190°C, 220°C, 220°C, 220°C, 200°C, 200°C, 190°C, and 190°C in sequence, the head temperature was 190°C, and the screw speed was set to 220 r / min to obtain a modified TPU.

[0060] The preparation method of the TPU film comprises the following steps: mixing modified TPU, PEBA, and a compatibilizer at a rotation speed of 350 rpm and a temperature of 55° C., stirring for 15 minutes to obtain a mixture; transferring the mixture into a twin-screw extruder for melt extrusion, wherein the temperature of each zone of the twin-screw extruder from the feed port to the die is: zone 1 temperature 200° C., zone 2 temperature 210° C., zone 3 temperature 230° C., zone 4 temperature 240° C., zone 5 temperature 250° C., zone 6 temperature 250° C., zone 7 temperature 240° C., die head temperature 240° C., rotation speed 150 rpm / min, granulation, and finally blowing into a film using a film blowing machine to obtain a TPU film with a thickness of 0.04 mm;

[0061] The method for preparing the water-proof and antibacterial soft air cushion powder puff comprises the following steps:

[0062] (1) Cut the sponge, film layer A, barrier layer, film layer B, and puff layer to target sizes respectively;

[0063] (2) hot pressing the adhesive film layer A on the surface of the sponge at a temperature of 160°C and a pressure of 450 MPa;

[0064] (3) hot pressing a barrier layer on the outer surface of the film layer A at a temperature of 180° C. and a pressure of 450 MPa;

[0065] (4) hot pressing the adhesive film layer B on the outer surface of the barrier layer at a temperature of 160° C. and a pressure of 450 MPa;

[0066] (5) hot pressing the puff layer on the surface of the film layer B at a temperature of 145° C. and a pressure of 450 MPa to obtain an intermediate product;

[0067] (6) The intermediate product is heated a second time and cooled at room temperature to obtain the primary product;

[0068] (7) The primary product is placed in a mold and punched, cut, and formed using a punching machine to obtain a water-proof and antibacterial soft air cushion powder puff.

[0069] The press pressure is 10T, one puff can be punched at a time, the table is 800*800mm, the opening is 200mm, the stroke is 130mm, the downward speed is 120mm / s, and the return speed is 60mm / s.

[0070] The mold is made of steel with a hardness of 35 and a blade width of 15C.

[0071] Example 2

[0072] This embodiment provides a water-proof and antibacterial soft air cushion powder puff, which comprises, from the inside to the outside, a sponge, a film layer A, a barrier layer, a film layer B, and a puff layer; the sponge and the barrier layer are bonded by the film layer A, and the barrier layer and the puff layer are bonded by the film layer B;

[0073] The thickness of the adhesive film layer A is 0.05 mm.

[0074] The thickness of the adhesive film layer B is 0.025 mm.

[0075] The powder puff layer is made of acrylic fiber.

[0076] The barrier layer is made of a TPU film comprising the following components by weight: 60 parts of modified TPU, 20 parts of PEBA, and 1.45 parts of a compatibilizer. PEBA was purchased from Arkema, France, with the brand name Pebax 2533SA01.

[0077] The compatibilizer is MAH-g-SEBS, which is purchased from Kraton Corporation of the United States, model number Kraton FG1924G.

[0078] The preparation method of the modified TPU comprises the following steps:

[0079] (1) Nano-titanium dioxide, diethyl terephthalate, 1,2-propylene glycol, and tetrabutyl titanate in a molar ratio of 3:1.0:2.4:0.03 were mixed, heated to 145°C, stirred for 40 minutes, then heated to 230°C, reacted for 1.7 hours, and then heated to 275°C, reacted under vacuum for 1.5 hours; the product was washed with phenol, centrifuged, and vacuum dried to obtain polyester-coated nano-titanium dioxide;

[0080] (2) 100 parts by weight of a thermoplastic polyurethane elastomer and 8 parts by weight of polyester-coated nano-titanium dioxide were mixed, wherein the thermoplastic polyurethane elastomer had an elongation at break of 650% and a tear strength of 95 kN / m, and was purchased from BASF, Germany, model 585A; the mixture was extruded through a twin-screw extruder, the temperatures of each section of the screw extruder were 190°C, 220°C, 220°C, 220°C, 200°C, 200°C, 190°C, and 190°C, the head temperature was 190°C, and the screw speed was set to 220 r / min to obtain a modified TPU.

[0081] The preparation method of the TPU film comprises the following steps: mixing modified TPU, PEBA, and a compatibilizer at a rotation speed of 350 rpm and a temperature of 55° C., stirring for 15 minutes to obtain a mixture; transferring the mixture into a twin-screw extruder for melt extrusion, wherein the temperature of each zone of the twin-screw extruder from the feed port to the die is: zone 1 temperature 200° C., zone 2 temperature 210° C., zone 3 temperature 230° C., zone 4 temperature 240° C., zone 5 temperature 250° C., zone 6 temperature 250° C., zone 7 temperature 240° C., die head temperature 240° C., rotation speed 150 rpm / min, granulation, and finally blowing into a film using a film blowing machine to obtain a TPU film with a thickness of 0.04 mm;

[0082] The method for preparing the water-proof and antibacterial soft air cushion powder puff comprises the following steps:

[0083] (1) Cut the sponge, film layer A, barrier layer, film layer B, and puff layer to target sizes respectively;

[0084] (2) hot pressing the adhesive film layer A on the surface of the sponge at a temperature of 160°C and a pressure of 450 MPa;

[0085] (3) hot pressing a barrier layer on the outer surface of the film layer A at a temperature of 180° C. and a pressure of 450 MPa;

[0086] (4) hot pressing the adhesive film layer B on the outer surface of the barrier layer at a temperature of 160° C. and a pressure of 450 MPa;

[0087] (5) hot pressing the puff layer on the surface of the film layer B at a temperature of 145° C. and a pressure of 450 MPa to obtain an intermediate product;

[0088] (6) The intermediate product is heated a second time and cooled at room temperature to obtain the primary product;

[0089] (7) The primary product is placed in a mold and punched, cut, and formed using a punching machine to obtain a water-proof and antibacterial soft air cushion powder puff.

[0090] The press pressure is 10T, one puff can be punched at a time, the table is 800*800mm, the opening is 200mm, the stroke is 130mm, the downward speed is 120mm / s, and the return speed is 60mm / s.

[0091] The mold is made of steel with a hardness of 35 and a blade width of 15C.

[0092] Comparative Example 1

[0093] The difference between this comparative example and Example 1 is that the TPU film includes the following components in parts by weight: 57 parts of modified TPU.

[0094] The preparation method of the modified TPU comprises the following steps: mixing 100 parts by weight of a thermoplastic polyurethane elastomer and 8 parts by weight of nano-titanium dioxide, wherein the thermoplastic polyurethane elastomer is purchased from BASF, Germany, and is BASF model 1185A10FC; and extruding the mixture through a twin-screw extruder, wherein the temperatures of the screw extruder sections are 190° C., 220° C., 220° C., 220° C., 200° C., 200° C., 190° C., and 190° C., the die head temperature is 190° C., and the screw speed is set at 220 r / min to obtain the modified TPU.

[0095] Comparative Example 2

[0096] The difference between this comparative example and Example 1 is that the TPU film comprises the following components in parts by weight: 57 parts of modified TPU. The preparation method of the modified TPU is the same as that of Example 1.

[0097] Comparative Example 3

[0098] The difference between this comparative example and Example 1 is that the TPU film comprises the following components in parts by weight: 57 parts of modified TPU and 24 parts of PEBA. The preparation method of the modified TPU is the same as that of Example 1.

[0099] Comparative Example 4

[0100] The difference between this comparative example and Example 1 is that 1.3 parts of compatibilizer is replaced by 1.0 part of compatibilizer.

[0101] Comparative Example 5

[0102] The difference between this comparative example and Example 1 is that 1.3 parts of compatibilizer is replaced by 1.6 parts of compatibilizer.

[0103] Comparative Example 6

[0104] The difference between this comparative example and Example 1 is that different thermoplastic polyurethane elastomers are used to prepare the modified TPU.

[0105] The thermoplastic polyurethane elastomer of this comparative example has an elongation at break of 600% and a tear strength of 70 kN / m, and is purchased from BASF, Germany, with a model number of 1185A10FC.

[0106] Comparative Example 7

[0107] The difference between this comparative example and Example 1 is that PEBA was purchased from Arkema, France, with the brand name Pebax25R53SP01.

[0108] Comparative Example 8

[0109] The difference between this comparative example and Example 1 is that the compatibilizer is MAH-g-SEBS, which is purchased from Kraton FG1901G, has a melt index of 22 g / 10 min, 230° C. / 5 kg, and a polystyrene content of 30 wt %.

[0110] Comparative Example 9

[0111] The difference between this comparative example and Example 1 is that the TPU film prepared in Example 1 in Chinese Patent Publication No. CN117844232B, which discloses a high-performance polyether TPU film and a preparation method thereof, has the same thickness as Example 1.

[0112] Performance Testing

[0113] The performance tests were performed on the TPU films prepared in Examples 1-2 and Comparative Examples 1-9.

[0114] (1) Water vapor permeability: Refer to GB / T12704-1991 to test water vapor permeability, using method B evaporation method.

[0115] (2) Tensile strength: Refer to GB / T1040.1-2006 to test the tensile strength.

[0116] (3) Antibacterial activity: Tested according to GB / T20944.3-2008, the experimental bacteria were Gram-positive Staphylococcus aureus (ATCC6538);

[0117] (4) Washability: The TPU film was washed 100 times in a drum washing machine and then dried to test its tear resistance, according to the test standard of ISO34-1.

[0118] Table 1 Performance test results

[0119]

[0120]

[0121] As can be seen from Table 1, the comprehensive performance of the TPU films of Examples 1-2 is excellent, and the powder puffs prepared therefrom have a longer service life.

[0122] In Comparative Example 1, TPU is directly mixed with nano-titanium dioxide. The tensile strength of the TPU film is better than that of Example 1, but the antibacterial property is reduced, the moisture permeability is increased, and the water washability is deteriorated.

[0123] In Comparative Example 2, only modified TPU was used to prepare the TPU film, and the moisture permeability of the TPU film increased, while the water washability decreased.

[0124] Comparative Examples 1 and 2 show that the addition of PEBA and a compatibilizer to the system of Example 1 of the present invention is acceptable at the expense of some tensile strength, and the combination of the three significantly improves the moisture permeability and water washability.

[0125] In Comparative Example 3, no compatibilizer was added, the moisture permeability of the TPU film increased, and the water washability decreased.

[0126] The amount of compatibilizer in Comparative Examples 4 and 5 is different. The tensile strength of the TPU film decreases, the moisture permeability increases, and the water washability decreases. Analysis shows that the amount of compatibilizer added is too low, the dispersion of PEBA and modified TPU is uneven, and agglomeration occurs; excessive compatibilizer may interfere with the orderly arrangement of the polymer chains, reduce the number or size of the crystalline regions, and thus affect the mechanical properties of the material.

[0127] In Comparative Examples 6-8, the types of TPU, PEBA and compatibilizer are different, and the comprehensive performance of the TPU film decreases, indicating that the specific types of TPU, PEBA and compatibilizer selected in Example 1 have a synergistic effect.

[0128] In Comparative Example 9, the TPU film was prepared using the prior art method, and the moisture permeability was high, but the mechanical properties were lower than those of Example 1.

[0129] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A water-proof and antibacterial soft air cushion powder puff, characterized in that: The air cushion powder puff includes sponge, film layer A, barrier layer, film layer B and puff layer from inside to outside; The barrier layer is made of a TPU film, which comprises the following components in parts by weight: 50-60 parts of modified TPU, 20-30 parts of PEBA, and 1.25-1.45 parts of a compatibilizer; The modified TPU is prepared by mixing 100 parts by weight of thermoplastic polyurethane elastomer and 4-8 parts by weight of polyester-coated nano-titanium dioxide and melt-extruding. The elongation at break of thermoplastic polyurethane elastomer is 650-700%, and the tear strength is 90-100 kN / m; The compatibilizer is MAH-g-SEBS, with a melt index of 36 to 43 g / 10 min at 230°C / 5 kg and a styrene content of 12 to 16 wt%; The brand name of PEBA is Pebax2533SA01.

2. The water-proof and antibacterial soft air cushion powder puff according to claim 1, characterized in that: The polyester-coated nano-titanium dioxide is prepared by mixing nano-titanium dioxide, diethyl terephthalate, propylene glycol and tetrabutyl titanate and then heating the mixture for reaction.

3. The water-proof and antibacterial soft air cushion powder puff according to claim 2, characterized in that: The molar ratio of the nano titanium dioxide, diethyl terephthalate, propylene glycol and tetrabutyl titanate is 3: (1.0-1.3): (2.4-2.7): (0.01-0.03).

4. The water-proof and antibacterial soft air cushion powder puff according to claim 3, characterized in that: The preparation method of the modified TPU comprises the following steps: (1) mixing nano-titanium dioxide, diethyl terephthalate, propylene glycol and tetrabutyl titanate, heating to 145-150° C., stirring, continuing to heat to 220-240° C., reacting, heating to 270-280° C., reacting under vacuum; washing the product, centrifuging, and vacuum drying to obtain polyester-coated nano-titanium dioxide; (2) Thermoplastic polyurethane elastomer and polyester-coated nano-titanium dioxide are mixed and extruded through a twin-screw extruder to obtain modified TPU.

5. The water-proof and antibacterial soft air cushion powder puff according to claim 1, characterized in that: The preparation method of the TPU film comprises the following steps: mixing modified TPU, PEBA and a compatibilizer to obtain a mixture; transferring the mixture into a twin-screw extruder for melt extrusion, granulation, and finally blowing the mixture into a film using a film blowing machine to obtain a TPU film with a thickness of 0.015-0.1 mm.

6. The water-proof and antibacterial soft air cushion powder puff according to claim 1, characterized in that: The thickness of the adhesive film layer A is 0.015-0.1 mm; the thickness of the adhesive film layer B is 0.020-0.030 mm.

7. A method for preparing the water-proof and antibacterial soft air cushion powder puff according to any one of claims 1 to 6, characterized in that: The following steps are involved: (1) Cut the sponge, film layer A, barrier layer, film layer B, and puff layer to target sizes respectively; (2) hot pressing the adhesive film layer A on the surface of the sponge; (3) thermally pressing a barrier layer onto the outer surface of the film layer A; (4) hot pressing the adhesive film layer B on the outer surface of the barrier layer; (5) hot pressing the puff layer on the surface of the film layer B to obtain an intermediate product; (6) The intermediate product is heated a second time and cooled at room temperature to obtain the primary product; (7) The primary product is placed in a mold and punched, cut, and formed using a punching machine to obtain a water-proof and antibacterial soft air cushion powder puff.

Images