A skin-friendly foaming TPE gasket, preparation method and application

Abstract

The application provides a skin-friendly foaming TPE pad, a preparation method and application. The skin-friendly foaming TPE pad prepared by the application comprises a first material layer and a second material layer, the second material layer simultaneously has a hand feel agent and super-hydrophilic silica sol, can effectively absorb sweat generated by a human body through a part of the super-hydrophilic structure, and discharge along the hydrophilic structure, improve the moisture conductivity of a bra pad, and cannot produce a stuffy feeling. Meanwhile, the hand feel agent provides the pad with a persistent dry skin feeling, avoids a sticky feeling caused by sweat and clothes adhering to the skin, and improves the use feeling of a user. The hand feel agent is used in cooperation with the super-hydrophilic silica sol, the water absorption and moisture conductivity of the pad are enhanced, and the water absorption and air permeability of the pad are more excellent.

Description

Technical Field

[0001] This invention relates to the field of women's underwear technology, and in particular to a skin-friendly foamed TPE pad, its preparation method, and its application. Background Technology

[0002] As people continue to pursue a healthy and high-quality life, the debate over healthy underwear is intensifying. In particular, the increase in breast diseases and breast cancer in recent years has led people to demand more from bras in terms of comfort, health, safety, and environmental friendliness, and has also raised the standards for the materials used to fill bras.

[0003] Commonly used bra filling materials include: 1. Traditional sponge, which can beautifully accentuate a woman's curves and make her figure more graceful. However, it has poor breathability, especially in summer when worn, causing excessive sweating; it also has poor elasticity, is easily deformed and damaged, and is difficult to dry after washing, and is prone to aging; 2. Silicone gel materials, which are soft, elastic, and have a texture very similar to skin, providing a realistic feel; however, they have poor breathability, high density, and are heavy; 3. Non-woven padding materials, which have a three-dimensional structure, are lightweight, breathable, and do not easily yellow, and are considered a new material to replace polyurethane foam. However, they have low strength, are easily deformed, and bra cups made from this material have problems with washing, feel, and shaping.

[0004] There have been reports on the development of healthy bras with good breathability:

[0005] Invention patent CN200510132599.5 discloses a breathable structure bra, which is formed by sandwiching an intermediate layer between two layers in the bra component. A through hole is set by laser light to penetrate one layer, the intermediate layer and the other layer. The through hole achieves the purpose of breathability and helps to remove sweat, thus solving the problem of poor breathability of bras.

[0006] Invention patent CN201310359204.X discloses an environmentally friendly and breathable upright cotton bra cup. The cup body includes a core material and fabric covering the core in outer and inner layers. The core material is upright cotton with a honeycomb-like three-dimensional structure, and the fabric is a sandwich fabric with a three-dimensional mesh structure. Because it does not use traditional sponge cups, it has better breathability. However, while this patent offers structural breathability, the mesh-structured fabric covering the outer and inner layers of the upright cotton is bonded to it with hot melt adhesive. This adhesive can block the breathable pores to some extent. Furthermore, since the materials used are all polyester fibers, which have a moisture regain rate of only 0.2%, are not absorbent, and have poor moisture wicking properties, the bra can feel stuffy when worn.

[0007] Therefore, in response to the problems of poor breathability, lack of water absorption, and poor moisture wicking in the bra materials mentioned above, there is an urgent need to improve the bra materials. Summary of the Invention

[0008] Purpose of the invention: The purpose of this invention is to overcome the problems of poor breathability, non-absorption of water, and poor moisture wicking of existing bra materials, and to provide a dry and skin-friendly TPE pad that can quickly absorb and wick away moisture, giving users a better sense of comfort.

[0009] The technical solution of the present invention:

[0010] A skin-friendly foamed TPE liner, comprising a first material layer and a second material layer;

[0011] The first material layer includes:

[0012]

[0013] The second material layer includes:

[0014]

[0015] Furthermore, the styrene polymer is one or more combinations of styrene-ethylene / butene-styrene copolymer (SEBS), styrene-ethylene / propylene-styrene block copolymer (SEPS), and styrene-1,4-butadiene-1,2-butadiene-styrene copolymer (SBBS).

[0016] Furthermore, the white oil is a high-viscosity food-grade white oil, which can be selected from one or more combinations of 26#, 32#, 680#, 380N, and 550N.

[0017] Furthermore, the foaming agent is a thermally expanding microsphere foaming agent, specifically selected from one or more combinations of F-30, F-36, F36LV, F-48, FN-80GS, F-50, F-65, FN-100SS, FN-100S, F-100M, FN-100M, FN-100, F-105, FN-180SS, FN-180S, FN-180, F-190D, F230D, F-260D, F-2800D, F-2830D, and F2860D from Matsuki Oils & Fats Co., Ltd.

[0018] Furthermore, the tactile agent is a network polymer; the network polymer is obtained by three-dimensional cross-linking of perfluorinated units, organosilicon units and polyether units.

[0019] Furthermore, the perfluorinated unit is a perfluorinated diol; preferably, the perfluorinated unit is selected from one or more of perfluoro-1,10-decanediol, perfluoro-1,12-dodecanediol, tetradecanononane-1,9-diol, dodecafluoro-1,8-octanediol, octafluoro-1,6-hexanediol, and hexafluoro-1,5-pentanediol.

[0020] Furthermore, the polyether unit is an alkyl-terminated allyl ethylene oxide propylene oxide copolymer polyether.

[0021] Furthermore, the structural formula of the polyether unit is shown in Formula I:

[0022]

[0023] Where x:y = 3:7-7:3, x+y = 10; R is selected from methyl, ethyl, propyl or isopropyl.

[0024] Furthermore, the organosilicon unit includes linear terminal hydrogen-active organosilicon units and side-chain side hydrogen-active organosilicon units.

[0025] Furthermore, the structural formula of the linear hydrogen-terminated active organosilicon unit is shown in Formula II:

[0026]

[0027] Where a is an integer between 5 and 100.

[0028] Furthermore, the structural formula of the side-chain type hydrogen-based active organosilicon unit is shown in Formula II:

[0029]

[0030] Where b is 4 or 8.

[0031] Furthermore, the preparation method of the oleophobic skin-feel agent includes,

[0032] Step 1: Add the perfluorinated unit and the organosilicon unit to the reactor and stir until homogeneous; add catalyst 1 and heat to react, to obtain product 1;

[0033] Step 2: Heat product 1, add polyether unit, then add catalyst 2 to react. After the reaction is completed, raise the temperature and keep it warm to obtain the oleophobic skin feel agent.

[0034] Furthermore, the molar amounts of the perfluorinated unit, polyether unit, linear terminal hydrogen-active organosilicon unit, and side-chain side hydrogen-active organosilicon unit added are A, B, C, and D mol, respectively. Then, the relationship between A, B, C, and D is: 2*A+B≥2*C+(b+2)*D.

[0035] Furthermore, the antibacterial agent is one or more combinations of nano-silver antibacterial agents G-AG, G-KJ, G-FM, G-FMC, or TM-Ag01.

[0036] Furthermore, the superhydrophilic silica sol is a silane coupling agent modified silica sol; wherein the silane coupling agent is selected from one or more combinations of KH550, KH560, KH570, KH792, DL602KH550; and the silica sol is selected from one or more combinations of Ludox HS-40, Ludox AS-40, and Ludox TM-50.

[0037] Furthermore, the modification method of the silane coupling agent modified silica sol includes: feeding silica sol into a reactor and heating it, adding silane coupling agent, maintaining the temperature for reaction, and centrifuging to remove unreacted silane coupling agent after the reaction is completed to obtain the desired silane coupling agent modified silica sol.

[0038] Furthermore, the thickness ratio of the first material layer to the second material layer is 5-15mm:1-2mm.

[0039] On the other hand, this application provides a method for preparing the above-mentioned skin-friendly foamed TPE liner, specifically including:

[0040] The raw materials for the first material layer and the second material layer are poured into a mixer in proportion and stirred. After stirring, the mixture is sent to a foaming silicone material injection machine and injected into the lower mold of the foaming mold. Then, the upper mold and the lower mold are put together, foamed and shaped, and cut to obtain the first material layer and the second material layer. The first material layer and the second material layer are fixed to obtain the skin-friendly foamed TPE pad.

[0041] Furthermore, the fixing method includes, but is not limited to, hot melt adhesive heat fixing.

[0042] On the other hand, this application also provides the application of the skin-friendly foamed TPE pad in a bra, wherein the second material layer of the TPE pad is located on the side closer to the human body and the first material layer is located on the side farther away from the human body.

[0043] Beneficial effects:

[0044] 1. The skin-friendly foamed TPE pad prepared by the present invention has a two-layer structure. The second material layer has both superhydrophobic and superhydrophilic structures, which can effectively absorb the sweat produced by the human body through the superhydrophilic structure and discharge it along the hydrophilic structure, thereby improving the moisture wicking of the bra pad and preventing a stuffy feeling.

[0045] 2. The foamed TPE pad of the present invention contains a hand-feeling agent, which provides the pad with a long-lasting dry and skin-friendly feel, avoids the sticky feeling of clothes sticking to the skin due to sweating, and improves the user experience.

[0046] 3. The hand feel agent is used in conjunction with the superhydrophilic silica sol to enhance the water absorption and moisture wicking effect of the pad, making the pad more absorbent and breathable. Detailed Implementation

[0047] The present invention will be described below with reference to specific embodiments. It should be noted that the following embodiments are examples of the present invention and are used only to illustrate the invention, not to limit it. Other combinations and various modifications within the scope of the present invention can be made without departing from its spirit or scope.

[0048] Unless otherwise specified, all chemical reagents used in this invention are commercially available analytical grade reagents.

[0049] The styrene polymer used in the examples is Baling Petrochemical SEBS 503T; the white oil used is type 26#; the foaming agent used is type F-36; and the antibacterial agent used is type TM-Ag01.

[0050] Preparation of hand feel agent

[0051] Step 1: 46.2 g (0.1 mol) of perfluoro-1,10-decanediol, 118 g (0.05 mol) of linear-chain terminal hydrogen-based active organosilicon units (a=30), and 18.5 g (0.05 mol) of side-chain side hydrogen-based active organosilicon units (b=4) were added to the reactor and stirred until homogeneous. 0.9 g of stannous octoate was added as a catalyst, and the reaction was carried out at 40 °C for 24 h to obtain product 1.

[0052] Step 2: Heat the product 1 obtained in Step 1 to 80°C, then add 115.6g of allyl polyether (x=5, y=5, R is methyl) into the reactor, add 0.01g of chloroplatinic acid as a catalyst to carry out the reaction, and after the viscosity increases, heat to 140°C and keep warm for 3 hours to obtain the hand feel agent.

[0053] Preparation of superhydrophilic silica sol

[0054] 100g of Ludox AS40 silica sol was added to the reactor and heated to 50℃. Then, 5g of silane coupling agent KH560 was added dropwise to the reactor, and the reaction was maintained at this temperature for 4 hours. The unreacted coupling agent was removed by centrifugation to obtain the desired superhydrophilic silica sol.

[0055] Example 1

[0056] Mass fractions of each component in the raw material:

[0057]

[0058] The raw materials for the first and second material layers are poured into a mixer in proportion and stirred. After stirring, the mixture is fed into a silicone foaming material injection molding machine and injected into the lower mold of a foaming mold. The upper and lower molds are then joined together and foamed at room temperature to obtain the materials for the first and second material layers. The materials for the first and second material layers are then cut to obtain a 7mm first material layer and a 2mm second material layer, respectively. After evenly applying hot melt adhesive to the bottom of the first material layer, the second material layer is attached to the bottom of the first material layer and a pressure of 1.5Pa is applied. After standing for 15 minutes, the skin-friendly foamed TPE pad 1 is obtained.

[0059] Example 2

[0060] The preparation method of Example 2 is the same as that of Example 1, except that the mass fractions of each component in the raw materials are different, and the skin-friendly foamed TPE pad 2 is obtained.

[0061]

[0062] Example 3

[0063] The preparation method of Example 3 is the same as that of Example 1, except that the mass fractions of each component in the raw materials are different, and the skin-friendly foamed TPE pad 3 is obtained.

[0064]

[0065] Comparative Example 1

[0066] The preparation method of Comparative Example 1 is the same as that of Example 1, except that the mass fractions of each component in the raw materials are different, and the skin-friendly foamed TPE pad 4 is obtained.

[0067]

[0068] Comparative Example 2

[0069] The preparation method of Comparative Example 2 is the same as that of Example 1, except that the mass fractions of each component in the raw materials are different, and the skin-friendly foamed TPE pad 5 is obtained.

[0070]

[0071] Comparative Example 3

[0072] The preparation method of Comparative Example 3 is the same as that of Example 1, except that the mass fractions of each component in the raw materials are different, and the skin-friendly foamed TPE pad 6 is obtained.

[0073]

[0074]

[0075] The gaskets prepared in Examples 1-3 and Comparative Examples 1-3 were subjected to tests such as high-temperature aging, low-temperature white oil precipitation, compressive strength, and water absorption. The test results are shown in Table 1.

[0076] High-temperature aging test: The foamed TPE gaskets were cut into 5cm*5cm*5cm cubes and placed in an aging chamber equipped with UV lamps. The temperature of the aging chamber was controlled at 40℃ for 36 hours. The stickiness of the surface and the height maintenance (test height / initial height) were observed. Three samples were tested for each example and the average value was taken.

[0077] Compression strength retention: The foamed TPE pads were cut into 5cm*5cm*5cm cubes. Each pad was repeatedly squeezed with an external force of 100N. After repeating 3000 times, the height retention (test height / initial height) was tested. Three samples were tested for each example and the average value was taken.

[0078] Moisture absorption test: The foamed TPE pads were cut into 4cm x 4cm pieces, and their weight was measured and recorded as the initial weight (g). They were then immersed in water for 3 minutes to absorb water, and their weight after water absorption was measured and recorded as the weight after water absorption (g). Finally, the water absorption rate was calculated. The water absorption rate characterizes the water absorption capacity of the polyurethane foam; the higher the water absorption rate, the stronger the water absorption capacity. The water absorption rate (%) is calculated as: (Weight after water absorption - Initial weight) / Initial weight × 100%.

[0079] Table 1 Test Data

[0080]

[0081] As can be seen from the data in the table above, the skin-friendly foamed TPE pad provided by this invention, due to the addition of a chiral agent, can remain non-sticky at high temperatures, maintaining a dry and clean feel. The superhydrophilic silica sol added to the second material layer has both superhydrophobic and superhydrophilic structures, which can effectively absorb sweat produced by the human body through the superhydrophilic structure and expel it along the hydrophilic structure, improving the moisture wicking of the bra pad and preventing a stuffy feeling. At the same time, the combined use of the chiral agent and the superhydrophilic silica sol helps to improve the water absorption rate, quickly absorb and wick away moisture, making the pad's water absorption and breathability even better.

[0082] The present invention can also be implemented in various other ways. Without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and modifications according to the present invention, but these corresponding changes and modifications should all fall within the protection scope of the appended claims.

Claims

1. A skin-friendly foamed TPE pad, comprising a first material layer and a second material layer; characterized in that, The first material layer includes: 70-90 parts of styrene polymers; 10-30 parts white oil; Foaming agent 0.1-3 parts; Hand feel agent 0.1-1 part; Antibacterial agent 0.01-0.1 parts; The second material layer includes: 70-90 parts of styrene polymers; 10-30 parts white oil; Foaming agent 0.1-3 parts; Hand feel agent 0.1-3 parts; Antibacterial agent 0.01-0.1 parts; 0.1-3 parts of superhydrophilic silica sol; The tactile agent is a network polymer; the network polymer is obtained by three-dimensional crosslinking of perfluorodiol, organosilicon units and alkyl-terminated allyl ethylene oxide propylene oxide copolyether; The organosilicon unit includes linear-chain terminal hydrogen-active organosilicon units and side-chain side hydrogen-active organosilicon units. The superhydrophilic silica sol is a silane coupling agent modified silica sol; The modification method of the silane coupling agent modified silica sol includes: feeding silica sol into a reactor and heating it, adding silane coupling agent, maintaining the temperature for reaction, and removing unreacted silane coupling agent after the reaction to obtain the desired silane coupling agent modified silica sol.

2. The skin-friendly foamed TPE cushion according to claim 1, characterized in that, The thickness ratio of the first material layer to the second material layer is 5-15mm:1-2mm.

3. The method of making a skin-friendly foamed TPE cushion according to any one of claims 1-2, characterized in that, include: The raw materials for the first material layer and the second material layer are poured into a mixer in proportion and stirred. After mixing, the mixture is fed into a silicone foaming material injection machine and injected into the lower mold of the foaming mold. Then, the upper and lower molds are joined together to form a foamed material layer and a second material layer. The first and second material layers are then fixed to obtain the skin-friendly foamed TPE liner.

4. The application of the skin-friendly foamed TPE padding according to any one of claims 1-2 in a bra.

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