Bra with microporous polyurethane cups and preparation method thereof

Abstract

The invention discloses a bra with microporous polyurethane cups and a preparation method thereof, and relates to the field of high polymer materials, the bra comprises a bra body frame, and the pair of microporous polyurethane cups is mounted on the bra body frame; according to the bra with the microporous polyurethane cups and the preparation method of the bra, the prepared bra with the microporous polyurethane cups has moisture absorption and quick-drying performance and far infrared performance, sweat moisture excreted by a human body can be instantly absorbed, transmitted and diffused to the outer surface of the bra and quickly evaporated and dried, a good skin metabolism environment is provided, and the bra is dry and comfortable without stuffiness when worn; and the far infrared radiation generated by a human body can be absorbed and reflected, resonance with human cells is realized, blood circulation is promoted, and the far infrared physiotherapy device is suitable for auxiliary physiotherapy of hyperplasia of mammary glands and breast distending pain and discomfort, can be washed by hands and machines and is long in service life.

Description

Technical Field

[0001] The present invention relates to polymer material technology, in particular to a bra with a microporous polyurethane cup and a preparation method thereof. Background Art

[0002] Bras are a type of underwear used by women. The cups of existing bras are mostly made of sponge, which is not moisture-absorbing and quick-drying. They have the defect of blocking the dissipation of sweat, resulting in dampness and stuffiness when worn, and easy breeding of bacteria, which is one of the external factors affecting breast health.

[0003] A Chinese invention patent with publication number CN111657566A discloses a far-infrared heating therapy bra. This far-infrared heating therapy bra is equipped with a magnetic power supply, microcrystalline graphite fiber cloth and a temperature control device. It emits far-infrared rays that resonate with human cells, promote blood circulation, and is suitable for auxiliary therapy of breast diseases. However, active far-infrared bras have the disadvantages of complex structure and inconvenient use. Summary of the Invention

[0004] The purpose of the present invention is to provide a bra with a microporous polyurethane cup and a preparation method thereof, so as to solve the problem in the prior art that the bra cup material does not have moisture absorption and quick drying properties, blocks the dissipation of sweat, and thus forms a hot and humid microenvironment and induces health risks.

[0005] In order to achieve the above-mentioned object, the present invention provides the following technical solution: a bra with microporous polyurethane cups: comprising a bra body frame, on which a pair of microporous polyurethane cups are installed.

[0006] Furthermore, the microporous polyurethane cup has moisture absorption and quick-drying properties, meeting the evaluation standards of GB / T21655.1-2023.

[0007] Furthermore, the microporous polyurethane cup has far-infrared performance and complies with the GB / T30127-2013 evaluation standard.

[0008] A method for preparing a bra having a microporous polyurethane cup as described above comprises the following steps:

[0009] S1. By weight, 100 parts by weight of thermoplastic polyurethane are gradually added to 200-500 parts by weight of an organic solvent, and stirred at 60-80° C. until completely dissolved; high-speed dispersion is performed at 2000-2500 rpm for 20-30 minutes to form a chemical dispersion; 60-250 parts by weight of a porogen and 4-10 parts by weight of a surfactant are added, and the mixture is stirred uniformly to obtain a rubber compound;

[0010] S2, injecting the rubber material into the cup mold, and quick-freezing and shaping at -15°C to -78°C to obtain the cup blank;

[0011] S3, taking out the cup blank and placing it in a coagulation bath at 5-20℃, removing the organic solvent and the pore-forming agent by water displacement, and causing phase separation until the cup blank is completely coagulated;

[0012] S4, repeatedly washing the coagulated cup blank in water to remove residual organic solvent, pore-forming agent and surfactant, and then drying at 80-100℃ to obtain a microporous polyurethane cup;

[0013] S5, mounting the microporous polyurethane cup to the bra body frame to obtain a bra with a microporous polyurethane cup.

[0014] Further, the thermoplastic polyurethane is selected from at least one of polyether type thermoplastic polyurethane, polyester type thermoplastic polyurethane, polycarbonate type thermoplastic polyurethane or polycaprolactone type thermoplastic polyurethane.

[0015] Further, the thermoplastic polyurethane is a blend of polycarbonate type and polyether type at a mass ratio of 1:0.2-1.

[0016] Further, the organic solvent is selected from at least one of dimethylformamide, dimethylacetamide or dimethyl sulfoxide.

[0017] Further, the pore-forming agent is selected from at least one of water-soluble resin, water-soluble inorganic salt or soluble starch.

[0018] Further, the surfactant is an anionic surfactant.

[0019] Further, the surfactant is sodium dioctyl sulfosuccinate.

[0020] The microporous polyurethane cup uses thermoplastic polyurethane as the base material, and is prepared by blending with an organic solvent, a pore-forming agent and a surfactant to form a rubber compound. In the subsequent process, the organic solvent and the pore-forming agent in the rubber compound are removed by water displacement and phase separation to form a network of through micropores with a specific topological structure, thereby achieving the moisture absorption and quick drying performance.

[0021] The microporous polyurethane cup described above constructs a dense and stable network skeleton through interpenetration and entanglement of two polyurethane molecular chains, significantly improving the comprehensive mechanical properties. This feature allows the cup surface to meet the strength requirements without the need for adhesive fabric lining, completely solving the defect of fabric and adhesive blocking the evaporation of sweat moisture in the traditional process.

[0022] The microporous polyurethane cup prepared by the above method has a pore volume of about 4cm 3The pore size distribution peak is located in the interval of 0.5-30 mu m. The scale matches the far infrared wavelength (4-14 mu m) of human body radiation, can efficiently absorb the far infrared radiation of human body and excite the resonance effect, the far infrared emissivity of the bra cup is increased to about 90%, the passive resonance response activates the body cells, and the subcutaneous blood circulation and metabolism are promoted.

[0023] Compared with the prior art, the bra with the microporous polyurethane bra cup and the preparation method thereof provided by the application have the moisture absorption and quick drying performance and the far infrared performance, can instantly absorb the sweat excreted by the human body and transmit and diffuse the sweat to the outer surface of the bra, quickly evaporate and dry, provide a good skin metabolism environment, are dry and cool to wear, can absorb and reflect the far infrared radiation generated by the human body, resonate with the human cells, promote blood circulation, are suitable for auxiliary physiotherapy of mammary gland hyperplasia and breast swelling and pain, can be washed by hand or machine, and have a long service life. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments described in the present application, and other drawings can also be obtained by those skilled in the art according to these drawings.

[0025] Figure 1 The preparation method process flow chart of the bra with the microporous polyurethane bra cup provided by the embodiments of the present application. DETAILED DESCRIPTION

[0026] In order to enable those skilled in the art to better understand the technical solutions of the present application, the present application will be further described in detail with reference to the drawings.

[0027] The present application provides a bra with a microporous polyurethane bra cup, comprising a bra body frame, and a pair of microporous polyurethane bra cups mounted on the bra body frame.

[0028] The microporous polyurethane bra cup has moisture absorption and quick drying performance, and meets the evaluation standard of GB / T21655.1-2023.

[0029] The microporous polyurethane bra cup has far infrared performance, and meets the evaluation standard of GB / T30127-2013.

[0030] Please refer to Figure 1 The present application also provides a preparation method of the bra with the microporous polyurethane bra cup, comprising the following steps:

[0031] S1, 100 parts by mass of thermoplastic polyurethane is gradually added into 200-500 parts by mass of organic solvent, stirred at 60-80℃ until completely dissolved; dispersed at 2000-2500 rpm for 20-30 minutes to form a chemical dispersion; 60-250 parts by mass of porogen and 4-10 parts by mass of surfactant are added and stirred uniformly to obtain a glue;

[0032] S2, the glue is injected into the cup mold, and the cup blank is obtained by rapid freezing and setting at-15℃ to-78℃.

[0033] S3, the cup blank is taken out and placed in a coagulation bath at 5-20℃, and the organic solvent and porogen are removed by water displacement, and phase separation occurs until the cup blank is completely coagulated.

[0034] S4, after repeatedly washing the coagulated cup blank in water to remove residual organic solvent, porogen and surfactant, drying treatment is carried out at 80-100℃ to obtain a microporous polyurethane cup.

[0035] S5, the microporous polyurethane cup is installed on the bra body frame to obtain a bra with a microporous polyurethane cup.

[0036] In the coagulation bath process, the blank after rapid freezing and setting is immersed in water at 5-20℃, and water molecules penetrate and dissolve the organic solvent to form a two-way diffusion system: water continuously displaces the solvent inside the blank, while dissolving the porogen, triggering the spinodal decomposition phase separation of the polymer solution; when the solvent / water ratio exceeds the critical concentration, the polyurethane rich phase solidifies to form a through hole wall, and the porogen dissolves to form a capillary channel, and finally the coagulation is completed to obtain a stable microporous structure.

[0037] The thermoplastic polyurethane is selected from at least one of polyether type thermoplastic polyurethane, polyester type thermoplastic polyurethane, polycarbonate type thermoplastic polyurethane or polycaprolactone type thermoplastic polyurethane, preferably a blend of polycarbonate type and polyether type at a mass ratio of 1:0.2-1, which can form an interpenetrating polymer network structure by solution blending method to improve the physical and mechanical properties.

[0038] The organic solvent is selected from at least one of dimethylformamide, dimethylacetamide or dimethyl sulfoxide, which has strong polarity and moderate boiling point, can efficiently dissolve the thermoplastic polyurethane, and can be completely replaced by water in the low-temperature coagulation bath to avoid residual toxicity, preferably dimethylformamide.

[0039] The porogen is selected from at least one of water-soluble resin, water-soluble inorganic salt or soluble starch, preferably polyvinyl alcohol.

[0040] The surfactant is an anionic surfactant, preferably sodium di-n-octyl sulfonate.

[0041] The following, citing examples to more specifically describe the embodiments of the application. Various tests and evaluation in accordance with the following method. In addition, as long as no special mention, "parts", "percent" are mass basis. If no special mention, the components used can be purchased.

[0042] Examples

[0043] A bra with micro-porous polyurethane cup and its preparation method, comprising a bra body frame, a pair of micro-porous polyurethane cups are installed on the bra body frame.

[0044] A method for preparing a bra with micro-porous polyurethane cup as described above, comprising the following steps:

[0045] S1, the preparation of thermoplastic polyurethane glue: take 100 parts by mass of thermoplastic polyurethane, 410 parts by mass of dimethylformamide, add 160 parts by mass of polyvinyl alcohol and 7 parts by mass of sodium dioctyl sulfosuccinate;

[0046] In the stirring disperser, add the measured dimethylformamide, gradually add the measured thermoplastic polyurethane under stirring, control the temperature to 60-80℃ until completely dissolved, increase the speed to 2000-2500 revolutions per minute, high-speed dispersion for 20-30 minutes, form a chemical dispersion, add the measured polyvinyl alcohol and sodium dioctyl sulfosuccinate, stir evenly, get the thermoplastic polyurethane glue;

[0047] S2, cup blank shaping: the thermoplastic polyurethane glue is injected into the cup mold, and is placed in a refrigerator at-25℃ for quick freezing and shaping to obtain a cup blank;

[0048] S3, cup blank solidification: open the mold, and place the cup blank shaped by freezing in a 12℃ solidification bath to replace dimethylformamide and polyvinyl alcohol with water, and phase separation occurs until the cup solidifies;

[0049] S4, cup cleaning and drying: the solidified cup blank is repeatedly washed in hot water at 80℃ to wash away the residual dimethylformamide, polyvinyl alcohol and sodium dioctyl sulfosuccinate in the cup, and is dried in an oven at 100℃ to obtain a micro-porous polyurethane cup;

[0050] S5, install the micro-porous polyurethane cup on the bra body frame to obtain a bra with micro-porous polyurethane cup.

[0051] 1. In order to verify the moisture absorption and quick drying performance of the cup prepared in this embodiment, the moisture absorption and quick drying test (GB / T21655.1-2023) is carried out:

[0052] The test results are as follows:

[0053] Test item Water absorption Drop spread time Wicking height Drying rate Test result 391％ 1s 106 mm 0.2 g / h

[0054] Table 1

[0055] As can be seen from the above, the microporous polyurethane cup prepared in this embodiment has an ultra-high water absorption rate of 391% (national standard assessment standard ≥80%) in terms of moisture absorption and quick-drying performance, which can quickly absorb a large amount of sweat; the instantaneous drip diffusion ability of 1s (national standard assessment standard ≤6s) effectively prevents skin moisture; the ultra-high wicking height of 106mm (national standard assessment standard ≥80mm) drives efficient water transmission and diffusion; this structure, combined with a drying rate of 0.2g / h (national standard assessment standard ≥0.20g / h), achieves rapid evaporation and drying of sweat, fully ensuring dryness and comfort in hot weather and sports scenes.

[0056] 2. To verify the far-infrared performance of the cup prepared in this example, a far-infrared performance test (GB / T30127-2013) and a pore volume and pore diameter test (GB / T21650.3-2011) were performed:

[0057] The test results are shown in the following table:

[0058] Test item Pore volume Pore diameter Far infrared reflectance Far infrared radiation temperature rise value Test result 3.88 cm 3 / g]] 2909 nm 0.90 2.1℃

[0059] Table 2

[0060] From the above, it can be seen that the microporous polyurethane cup prepared in this embodiment has a far infrared performance of 2909nm and 3.88cm. 3 / g pore volume structure, forming an efficient radiation carrier, achieving a reflectivity of 0.90 (national standard evaluation standard > 0.83) and a radiation temperature rise value of 2.1℃ (national standard evaluation standard > 1.7), which can promote blood circulation and give the product therapeutic functions.

[0061] The above description is merely illustrative of certain exemplary embodiments of the present invention. It goes without saying that those skilled in the art will be able to modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims.

Claims

1. A bra with a microporous polyurethane cup, characterized in that: The utility model comprises a bra body frame, on which a pair of microporous polyurethane cups are mounted.

2. The bra with microporous polyurethane cup according to claim 1, characterized in that: The microporous polyurethane cup is moisture-absorbent and quick-drying, meeting the evaluation standards of GB / T21655.1-2023.

3. The bra with microporous polyurethane cup according to claim 1, characterized in that: The microporous polyurethane cup has far-infrared performance and meets the evaluation standards of GB / T30127-2013.

4. A method for preparing a bra with a microporous polyurethane cup according to any one of claims 1 to 3, characterized in that: The following steps are involved: S1. By weight, 100 parts by weight of thermoplastic polyurethane are gradually added to 200-500 parts by weight of an organic solvent, and stirred at 60-80° C. until completely dissolved; high-speed dispersion is performed at 2000-2500 rpm for 20-30 minutes to form a chemical dispersion; 60-250 parts by weight of a porogen and 4-10 parts by weight of a surfactant are added, and the mixture is stirred uniformly to obtain a rubber compound; S2, injecting the rubber material into the cup mold, and quick-freezing and shaping at -15°C to -78°C to obtain the cup blank; S3, taking out the cup blank and placing it in a coagulation bath at 5-20°C, removing the organic solvent and porogen by water displacement, and causing phase separation until the cup blank is completely solidified; S4, placing the solidified cup blank in water and repeatedly washing it to remove residual organic solvent, porogen and surfactant, and then drying it at 80-100° C. to obtain a microporous polyurethane cup; S5. Install the microporous polyurethane cup onto the bra body frame to obtain a bra with the microporous polyurethane cup.

5. The method for preparing a bra with a microporous polyurethane cup according to claim 4, characterized in that: The thermoplastic polyurethane is selected from at least one of polyether thermoplastic polyurethane, polyester thermoplastic polyurethane, polycarbonate thermoplastic polyurethane and polycaprolactone thermoplastic polyurethane.

6. The method for preparing a bra with a microporous polyurethane cup according to claim 4, characterized in that: Thermoplastic polyurethane is a blend of polycarbonate and polyether in a mass ratio of 1:0.2-1.

7. The method for preparing a bra with a microporous polyurethane cup according to claim 4, characterized in that: The organic solvent is selected from at least one of dimethylformamide, dimethylacetamide and dimethyl sulfoxide.

8. The method for preparing a bra with a microporous polyurethane cup according to claim 4, characterized in that: The porogen is selected from at least one of a water-soluble resin, a water-soluble inorganic salt or a soluble starch.

9. The method for preparing a bra with a microporous polyurethane cup according to claim 4, characterized in that: The surfactant is an anionic surfactant.

10. The method for preparing a bra with a microporous polyurethane cup according to claim 4, characterized in that: The surfactant is sodium di-sec-octyl maleate sulfonate.

Images