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

Abstract

The invention belongs to the technical field of powder puffs, and particularly relates to a waterproof and antibacterial soft air cushion powder puff and a preparation method thereof. The waterproof and antibacterial soft air cushion powder puff sequentially comprises sponge, an adhesive film layer A, a blocking layer, an adhesive film layer B and a powder puff layer from inside to outside, the barrier layer is made of a TPU (Thermoplastic Polyurethane) film, and the TPU film is prepared from the following components in parts by weight: 50 to 60 parts of modified TPU, 20 to 30 parts of PEBA (Polyethylene Benzene Acetate) and 1.25 to 1.45 parts of compatilizer. 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 carrying out melt extrusion. The waterproof and antibacterial soft air cushion powder puff prepared by the preparation method disclosed by the invention is good in antibacterial and waterproof effects and strong in washing resistance. According to the prepared air cushion powder puff, due to the fact that the punch forming process is adopted, the edge of the powder puff can be smoother and more natural, and obvious cutting marks or hard edges do not exist.

Description

Technical Field

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

[0002] An air-cushion powder puff is a makeup tool specifically designed to be used in conjunction with air-cushion BB cream, CC cream, or other liquid or creamy cosmetics. It usually has a soft and delicate texture, which can help evenly apply and pat the cosmetics, making the makeup more fitting and natural.

[0003] TPU (thermoplastic polyurethane elastomer) material is known for its excellent flexibility and resilience, which makes it very suitable for making items that need to be frequently bent and compressed, such as air-cushion powder puffs. TPU material is often used as the barrier layer of air-cushion powder puffs, and its main functions include waterproofing and providing necessary mechanical property support. Although TPU itself has many excellent properties, it cannot meet the ideal use standards of high-quality powder puffs in terms of antibacterial effect and wash resistance.

[0004] Chinese Patent No. CN117844232B discloses a high-performance polyether-based TPU film and a preparation method thereof. The polyether-based TPU film has advantages such as good aging resistance, air permeability, antibacterial property, wash resistance, waterproof property, tear resistance, and excellent mechanical properties. Summary of the Invention

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

[0006] To achieve the above purpose, the present invention provides the following technical solutions:

[0007] A water-proof and bacteria-proof soft air-cushion powder puff, the air-cushion powder puff sequentially includes a sponge, a glue film layer A, a barrier layer, a glue film layer B, and a powder puff layer from the inside to the outside; the sponge and the barrier layer are bonded through the glue film layer A, and the barrier layer and the powder puff layer are bonded through the glue film layer B.

[0008] The material of the barrier layer is a TPU film, and the TPU film 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 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 melt-extruding.

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

[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) Mix the nano-titanium dioxide, diethyl terephthalate, propylene glycol and tetrabutyl titanate, heat up to 145 - 150 °C, stir for 30 - 40 min, continue to heat up to 220 - 240 °C, react for 1.5 - 2 h, heat up to 270 - 280 °C, and react for 1 - 2 h under vacuum; wash the product with phenol, centrifuge, and dry in vacuum to obtain polyester-coated nano-titanium dioxide;

[0014] (2) Mix the thermoplastic polyurethane elastomer and the polyester-coated nano-titanium dioxide, and extrude through a twin-screw extruder to obtain the modified TPU.

[0015] By adding nano-titanium dioxide to the TPU in the present invention, the antibacterial property of the powder puff can be improved. In the present invention, diethyl terephthalate and propylene glycol are used to polymerize on the surface of the nano-titanium dioxide under the action of a catalyst to coat polyester, which can improve the dispersion of the nano-titanium dioxide in the system, and at the same time can improve the tensile strength of the TPU film.

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

[0017] Further, 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, 190 °C, the temperature of the die head is 190 °C, and the screw speed is set to 220 r / min.

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

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

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

[0021] Further, the PEBA is purchased from Arkema in France, grade Pebax2533SA01.

[0022] Further, the compatibilizer is MAH-g-SEBS, with a melt index of 36-43 g / 10 min under the conditions of 230 °C / 5 kg, and a styrene content of 12-16 wt%.

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

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

[0025] In the present invention, by adding PEBA to the modified TPU and simultaneously adding a compatibilizer, the three play a synergistic effect, which can improve the tear resistance of the TPU film and reduce the moisture permeability of the film. And when using specific types of TPU, PEBA and compatibilizer, a uniform and stable blend can be obtained, making the dispersed phase distribution more uniform, enhancing the affinity of the two-phase interface of the blend, and the comprehensive performance of the TPU film is better.

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

[0027] Further, the temperatures of each zone of the twin-screw extruder from the feeding port to the head are: the temperature of the first zone is 195 - 215 °C, the temperature of the second zone is 210 - 230 °C, the temperature of the third zone is 230 - 240 °C, the temperature of the fourth zone is 240 - 250 °C, the temperature of the fifth zone is 245 - 250 °C, the temperature of the sixth zone is 235 - 250 °C, the temperature of the seventh zone is 240 - 250 °C, the temperature of the head is 240 - 250 °C, and the rotation speed is 150 rpm / min.

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

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

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

[0031] Further, the adhesive film layer A and the adhesive film layer B are thermoplastic polyurethane elastomers.

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

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

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

[0035] (3) Thermally laminate the barrier layer on the outer surface of the adhesive film layer A;

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

[0037] (5) Thermally laminate the powder puff layer on the surface of the adhesive film layer B to obtain an intermediate product;

[0038] (6) Heat the intermediate product for a second time and cool it at room temperature to obtain a primary product;

[0039] (7) Place the primary product in a mold and use a stamping machine to perform stamping, cutting and forming to obtain a water-proof and bacteria-proof soft air-cushion powder puff.

[0040] Pressure of the press: 10T, stamping one powder puff at a time, table: 800*800mm, opening: 200mm, stroke: 130mm, downward speed: 120mm / s, return speed: 60mm / s.

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

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

[0043] 1. By adding nano-titanium dioxide to TPU in the present invention, the antibacterial property of the powder puff can be improved. In the present invention, diethyl terephthalate and propylene glycol are polymerized on the surface of nano-titanium dioxide under the action of a catalyst to coat polyester, which can improve the dispersion of nano-titanium dioxide in the system and at the same time improve the tensile strength of the TPU film.

[0044] 2. By adding PEBA to the modified TPU and adding a compatibilizer at the same time in the present invention, the three play 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 prepared by the present invention adopts a stamping process, which can make the edge of the powder puff smoother and more natural, without obvious cutting marks or hard edges, avoiding the discomfort or even the risk of skin cuts during use. The multi-layer structure not only enhances the functionality of the product (waterproof and antibacterial), but also provides a softer hand feeling and user experience, reducing the possibility of discomfort caused by contact with the skin. This waterproof and antibacterial soft air-cushion powder puff greatly improves the user experience on the basis of ensuring functionality by virtue of its unique manufacturing process and material selection considerations. Brief Description of the Drawings

[0046] Figure 1 It is a schematic diagram of the mold used in the present invention. Detailed Description of the Invention

[0047] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope 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 elastomers, purchased from Zhejiang Huafeng Thermoplastic Polyurethane Co., Ltd., model HF-1070AP.

[0050] Example 1

[0051] This example provides a waterproof and antibacterial soft air-cushion powder puff, which sequentially includes a sponge, an adhesive film layer A, a barrier layer, an adhesive film layer B, and a powder puff layer from the inside to the outside; the sponge and the barrier layer are bonded by the adhesive film layer A, and the barrier layer and the powder puff layer are bonded by the adhesive 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 acrylic fiber.

[0055] The material of the barrier layer is a TPU film, and the TPU film includes the following components in parts by weight: 57 parts of modified TPU, 24 parts of PEBA, and 1.3 parts of compatibilizer. PEBA is purchased from Arkema, France, grade Pebax2533SA01.

[0056] The compatibilizer is MAH-g-SEBS, and MAH-g-SEBS is purchased from Kraton Corporation, USA, model KratonFG1924G.

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

[0058] (1) Mix nano-titanium dioxide, diethyl terephthalate, 1,2-propanediol and tetrabutyl titanate with a molar ratio of 3:1.2:2.5:0.02, heat up to 145°C, stir for 40 min, continue to heat up to 230°C, react for 1.7 h, then heat up to 275°C and react for 1.5 h under vacuum; wash the product with phenol, centrifuge and dry under vacuum to obtain nano-titanium dioxide coated with polyester;

[0059] (2) Mix 100 parts by weight of thermoplastic polyurethane elastomer and 6 parts by weight of nano-titanium dioxide coated with polyester. The thermoplastic polyurethane elastomer has an elongation at break of 650% and a tear strength of 95 kN / m, and is purchased from BASF Germany, model 585A; extrude through a twin-screw extruder, and 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, 190°C in sequence, the head temperature is 190°C, and the screw speed is set at 220 r / min to obtain the modified TPU.

[0060] The preparation method of the TPU film comprises the following steps: Mix the modified TPU, PEBA and compatibilizer at a rotation speed of 350 rpm and a temperature of 55°C, and stir for 15 min to obtain a mixed material; transfer the mixed material into a twin-screw extruder for melt extrusion. The temperatures of each zone of the twin-screw extruder from the feeding port to the head are: the temperature of zone 1 is 200°C, the temperature of zone 2 is 210°C, the temperature of zone 3 is 230°C, the temperature of zone 4 is 240°C, the temperature of zone 5 is 250°C, the temperature of zone 6 is 250°C, the temperature of zone 7 is 240°C, the head temperature is 240°C, the rotation speed is 150 rpm / min, granulate, and finally blow it into a film with a film blowing machine to obtain a TPU film with a thickness of 0.04 mm;

[0061] The preparation method of the water-proof and bacteria-proof soft air cushion powder puff comprises the following steps:

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

[0063] (2) Thermally press and bond the adhesive film layer A on the surface of the sponge, with a thermo-pressing temperature of 160°C and a pressure of 450 MPa;

[0064] (3) Thermally press and bond the barrier layer on the outer surface of the adhesive film layer A, with a thermo-pressing temperature of 180°C and a pressure of 450 MPa;

[0065] (4) Thermally press and bond the adhesive film layer B on the outer surface of the barrier layer, with a thermo-pressing temperature of 160°C and a pressure of 450 MPa;

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

[0067] (6) Secondarily heat the intermediate product and cool it at room temperature to obtain a primary product;

[0068] (7) Place the primary product into a mold and use a stamping machine to perform stamping, cutting, and forming to obtain a water-proof and bacteria-proof soft-type air cushion powder puff.

[0069] Pressure of the press: 10T, stamping 1 powder puff at a time, tabletop: 800*800 mm, opening: 200 mm, stroke: 130 mm, downward speed: 120 mm / s, return speed: 60 mm / s.

[0070] The mold is made of steel, with a hardness of 35, and the width of the mold cutting edge is 15C.

[0071] Example 2

[0072] This example provides a water-proof and bacteria-proof soft-type air cushion powder puff, which sequentially includes a sponge, an adhesive film layer A, a barrier layer, an adhesive film layer B, and a powder puff layer from the inside to the outside; the sponge and the barrier layer are bonded through the adhesive film layer A, and the barrier layer and the powder puff layer are bonded through the adhesive 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 material of the barrier layer is a TPU film, and the TPU film includes the following components in parts by weight: 60 parts of modified TPU, 20 parts of PEBA, and 1.45 parts of compatibilizer. PEBA is purchased from Arkema, France, with the grade Pebax2533SA01.

[0077] The compatibilizer is MAH-g-SEBS, and MAH-g-SEBS is purchased from Kraton Corporation, USA, with the model KratonFG1924G.

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

[0079] (1) Mix nano-titanium dioxide, diethyl terephthalate, 1,2-propanediol, and tetrabutyl titanate with a molar ratio of 3:1.0:2.4:0.03, heat up to 145 °C, stir for 40 min, continue to heat up to 230 °C, react for 1.7 h, heat up to 275 °C, and react under vacuum for 1.5 h; wash the product with phenol, centrifuge, and vacuum dry to obtain polyester-coated nano-titanium dioxide;

[0080] (2) Mix 100 parts by weight of thermoplastic polyurethane elastomer and 8 parts by weight of polyester-coated nano-titanium dioxide. The elongation at break of the thermoplastic polyurethane elastomer is 650%, and the tear strength is 95 kN / m. It is purchased from BASF Corporation in Germany, with the model number 585A. Extrude through a twin-screw extruder. 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, 190 °C, and the head temperature is 190 °C. The screw speed is set at 220 r / min to obtain modified TPU.

[0081] The preparation method of the TPU film includes the following steps: Mix modified TPU, PEBA, and compatibilizer at a speed of 350 rpm and a temperature of 55 °C for 15 min to obtain a mixture; transfer the mixture into a twin-screw extruder for melt extrusion. The temperatures of each zone of the twin-screw extruder from the feeding port to the head are: the temperature of zone 1 is 200 °C, the temperature of zone 2 is 210 °C, the temperature of zone 3 is 230 °C, the temperature of zone 4 is 240 °C, the temperature of zone 5 is 250 °C, the temperature of zone 6 is 250 °C, the temperature of zone 7 is 240 °C, and the head temperature is 240 °C. The speed is 150 rpm / min. Granulate, and finally blow it into a film with a film blowing machine to obtain a TPU film with a thickness of 0.04 mm.

[0082] The preparation method of the water-proof and bacteria-proof soft type air cushion powder puff includes the following steps:

[0083] (1) Cut the sponge, adhesive film layer A, barrier layer, adhesive film layer B, and powder puff layer to the target size respectively.

[0084] (2) Thermally laminate the adhesive film layer A on the surface of the sponge at a thermocompression temperature of 160 °C and a pressure of 450 MPa.

[0085] (3) Thermally laminate the barrier layer on the outer surface of the adhesive film layer A at a thermocompression temperature of 180 °C and a pressure of 450 MPa.

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

[0087] (5) Thermally laminate the powder puff layer on the surface of the adhesive film layer B at a thermocompression temperature of 145 °C and a pressure of 450 MPa to obtain an intermediate product.

[0088] (6) Heat the intermediate product for the second time and cool it at room temperature to obtain a primary product.

[0089] (7) Place the primary product in a mold and use a stamping machine for stamping, cutting, and forming to obtain a water-proof and bacteria-proof soft type air cushion powder puff.

[0090] Pressure of the press: 10T, stamping 1 powder puff at a time, tabletop: 800*800mm, opening: 200mm, stroke: 130mm, downward speed: 120mm / s, return speed: 60mm / s.

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

[0092] Comparative Example 1

[0093] 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.

[0094] The preparation method of the modified TPU comprises the following steps: Mix 100 parts by weight of thermoplastic polyurethane elastomer and 8 parts by weight of nano-titanium dioxide. The thermoplastic polyurethane elastomer is purchased from BASF in Germany, with the model 1185A10FC; Extrude through a twin-screw extruder, and 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, 190°C, and the head temperature is 190°C. 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 are 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 are replaced by 1.6 parts of compatibilizer.

[0103] Comparative Example 6

[0104] The difference between this comparative example and Example 1 is that the thermoplastic polyurethane elastomer used for preparing the modified TPU is different.

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

[0106] Comparative Example 7

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

[0108] Comparative Example 8

[0109] The difference between this comparative example and Example 1 is that the compatibilizer was MAH-g-SEBS, which was purchased from Kraton FG1901G, with a melt index of 22 g / 10 min at 230 °C / 5 kg, and the polystyrene content was 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 of the Chinese patent with the publication number CN117844232B, which discloses a high-performance polyether-based TPU film and its preparation method, had the same thickness as that in Example 1.

[0112] Performance Test

[0113] The TPU films prepared in Examples 1-2 and Comparative Examples 1-9 were subjected to performance tests.

[0114] (1) Moisture permeability: The moisture permeability was tested with reference to GB / T 12704-1991, using Method B, the evaporation method.

[0115] (2) Tensile strength: The tensile strength was tested with reference to GB / T 1040.1-2006.

[0116] (3) Antibacterial property: It was tested with reference to GB / T 20944.3-2008, and the experimental strain was the Gram-positive bacterium Staphylococcus aureus (ATCC6538);

[0117] (4) Wash resistance: The TPU film was washed 100 times in a drum washing machine, and the tear resistance was tested after drying, and the test was carried out 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 TPU films of Examples 1-2 had excellent comprehensive performance, and the powder puffs prepared with them had a longer service life.

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

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

[0124] From Comparative Example 1 and Comparative Example 2, it can be seen that in the system of Example 1 of the present invention, adding PEBA and compatibilizer, sacrificing part of the tensile strength is acceptable, and the combined effect of the three on improving the moisture permeability and washability is significant.

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

[0126] In Comparative Example 4 and Comparative Example 5, the amounts of the compatibilizer were different. The tensile strength of the TPU film decreased, the moisture permeability increased, and the washability decreased. It was analyzed that when the addition amount of the compatibilizer was too low, the dispersion of PEBA and modified TPU was uneven, resulting in agglomeration; an excessive amount of the compatibilizer might interfere with the ordered arrangement of polymer chains, reducing the number or size of crystalline regions, thereby affecting the mechanical properties of the material.

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

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

[0129] The above is the preferred embodiment of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A water-proof and antibacterial soft air cushion powder puff, characterized in that: The air cushion powder puff comprises, from inside to outside, a sponge, a film layer A, a barrier layer, a film layer B and a powder puff layer; The barrier layer is made of 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 then melt-extruding.

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 them 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) A thermoplastic polyurethane elastomer and polyester-coated nano-titanium dioxide are mixed and extruded through a twin-screw extruder to obtain a modified TPU.

5. The water-proof and antibacterial soft air cushion powder puff according to claim 4, characterized in that: The breaking elongation of the thermoplastic polyurethane elastomer is 650-700%, and the tear strength is 90-100 kN / m.

6. The water-proof and antibacterial soft air cushion powder puff according to claim 1, characterized in that: The compatibilizer is MAH-g-SEBS, the melt index under the condition of 230° C. / 5kg is 36-43 g / 10 min, and the styrene content is 12-16 wt %.

7. 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.

8. 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.

9. The water-proof and antibacterial soft air cushion powder puff according to claim 1, characterized in that: The powder puff layer includes polyurethane, latex, non-latex, cotton, polyester, acrylic or nylon.

10. A method for preparing the water-proof and antibacterial soft air cushion powder puff according to any one of claims 1 to 9, characterized in that: The following steps are involved: (1) Cutting the sponge, film layer A, barrier layer, film layer B, and puff layer into 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) thermally pressing an adhesive film layer B on the outer surface of the barrier layer; (5) hot pressing a powder puff layer on the surface of the film layer B to obtain an intermediate product; (6) reheating the intermediate product and cooling it at room temperature to obtain a primary product; (7) The primary product is placed in a mold, and a punching machine is used to punch, cut and shape the product to obtain a water-proof and antibacterial soft air cushion powder puff.

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