Breathable washable silica gel chest cotton and preparation method thereof

Abstract

The invention discloses breathable and washable silica gel chest cotton and a preparation method thereof, and relates to the technical field of chest cotton, the chest cotton comprises soft net-shaped polyurethane and a silicone rubber composite material completely wrapping the surface of the soft net-shaped polyurethane, the silicone rubber composite material is prepared from the following components in parts by weight: 30-45 parts of silicone rubber, 1-5 parts of a foaming agent, 1-5 parts of a foaming agent, 1-5 parts of an anti-aging agent, 1-5 parts of an anti-aging agent and 1-5 parts of an anti-aging agent. The high-temperature-resistant silicone rubber comprises the following components in parts by weight: 30-45 parts of silicone oil, 6-15 parts of modified silicon dioxide, 10-25 parts of light calcium carbonate, 0.1-2 parts of a structured control agent, 2-5 parts of a cross-linking agent, 0.01-0.1 part of a reaction delay agent and 0.05-0.5 part of a platinum catalyst. The product has excellent air permeability, and the comfort and health of long-time wearing are effectively improved; due to the specific antibacterial design, the service life of the product is remarkably prolonged, and peculiar smell is reduced; meanwhile, washing durability is achieved, and daily cleaning and maintenance are facilitated.

Description

Technical Field

[0001] The invention relates to the field of bra sponges, and in particular to breathable and washable silicone bra sponges and a preparation method thereof. Background Art

[0002] Bra sponge is an important filling component of underwear, which has a significant impact on the comfort, fit and aesthetics of underwear. Currently, bra materials on the market mainly use polyurethane sponge, fiber cotton or thermoplastic elastomer.

[0003] Polyurethane sponge is the bra material with the highest market share. It is mainly made of polyether or polyester polyurethane foam and has the characteristics of light weight, moderate elasticity, and good formability. It can provide a certain degree of support and shaping effect for underwear. However, although the surface of polyurethane sponge has a porous structure and theoretically has a certain degree of breathability, its breathability is still poor in actual use. More seriously, it has strong water absorption and weak hydrophobicity. After washing, water is difficult to drain out. In humid weather, it may take 3 to 5 days to dry completely. This continuously humid environment provides ideal breeding conditions for bacteria, especially mold, making it a hotbed for microorganisms. In addition, polyurethane sponge is prone to aging phenomena such as yellowing, hardening and fragmentation during use, and its service life usually does not exceed one year.

[0004] Fiber-cotton bras are primarily made from polyester or other synthetic fibers through a thermal bonding process. Their advantages include being extremely lightweight, more breathable than polyurethane sponges, and relatively inexpensive. However, their primary drawback is their poor resilience. After washing or prolonged wear, they can easily deform and collapse, causing the bra to lose its supportive properties. Furthermore, the gaps between the fibers easily accumulate dust and dander, posing a health hazard if not thoroughly cleaned. Fiber-cotton bras also have a shorter lifespan, typically requiring replacement after about six months.

[0005] Thermoplastic elastomer (TPE) bra materials have been gaining popularity in recent years. These materials, typically injection-molded using materials such as SBS (styrene-butadiene-styrene) block copolymers or TPU (thermoplastic polyurethane elastomer), offer excellent elastic recovery and shape retention. However, the biggest drawback of TPE bra materials is that they are virtually non-breathable, making prolonged wear prone to causing localized heat and humidity. Furthermore, these materials are prone to softening and deformation when exposed to heat or certain chemicals (such as perfume and sunscreen), and their surfaces easily accumulate sweat and oil, requiring frequent cleaning while being vulnerable to repeated washing.

[0006] CN113121776A discloses a sweat-absorbing and breathable polyurethane sponge, a preparation method thereof, and a bra. The polyurethane sponge is prepared from the following raw materials in parts by weight: 100-160 parts of polyethylene glycol methyl ether, 20-70 parts of toluene diisocyanate, 8-15 parts of water, 2.3-4.8 parts of silicone oil, 0.2-1.6 parts of a surfactant, 0.05-0.45 parts of an amine catalyst, 3-7 parts of a foaming agent, 3.2-8.6 parts of a vegetable protein, and 6.4-15.6 parts of a hydrophilic cellulose.

[0007] This material is difficult to clean, has poor shape retention after washing, struggles to balance mechanical properties with comfort, has a short service life, and is prone to bacterial growth. Therefore, developing a silicone bra pad that is breathable, washable, quick-drying, antibacterial, and has a long service life is of great practical significance for improving user experience, protecting women's health, and enhancing product market competitiveness. Summary of the Invention

[0008] In order to address the deficiencies in the prior art, the purpose of the present invention is to provide a breathable and washable silicone bra pad and a preparation method thereof. The product has excellent breathability, effectively improving the comfort and health of long-term wear; the unique antibacterial design significantly extends the product's service life and reduces odor generation; at the same time, it also has water-washable durability, facilitating daily cleaning and maintenance.

[0009] In order to achieve the above object, the present invention adopts the following technical solutions:

[0010] A breathable and washable silicone bra pad comprises a soft mesh polyurethane and a silicone rubber composite material completely covering the surface of the soft mesh polyurethane. The silicone rubber composite material is made of the following components in parts by weight: 30-45 parts of silicone rubber, 30-45 parts of silicone oil, 6-15 parts of modified silicon dioxide, 10-25 parts of light calcium carbonate, 0.1-2 parts of a structuring control agent, 2-5 parts of a cross-linking agent, 0.01-0.1 parts of a reaction delay agent, and 0.05-0.5 parts of a platinum catalyst.

[0011] Preferably, the silicone rubber is methyl vinyl siloxane.

[0012] Preferably, the silicone oil is vinyl silicone oil.

[0013] Preferably, the preparation method of the modified silicon dioxide comprises the following steps:

[0014] (1) dispersing nano-silica into an ethanol aqueous solution, then adding KH550, stirring to react, filtering, washing, and drying the product to obtain amino-modified nano-silica;

[0015] Silane coupling: The ethoxy groups in the KH550 molecule first hydrolyze in the presence of water to form silanol groups. These silanol groups then react with hydroxyl groups on the silica surface through condensation to form a stable network of silicon-oxygen bonds. This condensation releases water molecules and simultaneously introduces organic chains with terminal amino groups onto the silica surface. These amino groups serve as active sites for subsequent reactions. This step successfully organicizes the inorganic silica surface and provides reactive properties for further modification.

[0016] Preferably, in step (1), the concentration of the ethanol aqueous solution is 95 wt %; the usage ratio of nano-silica, ethanol aqueous solution, and KH550 is 10 g: 100-150 mL: 1-4 g.

[0017] Preferably, in step (1), the stirring reaction condition is 65-80° C. for 5-8 h.

[0018] (2) dispersing the amino-silica in PBS buffer, adding EDC and NHS, stirring to activate, then adding L-histidine, stirring to react, filtering the product, washing with water, and redispersing it in deionized water, adding silver nitrate solution in the dark, complexing reaction, centrifuging and washing the product to obtain intermediate silica;

[0019] Surface bifunctionalization: EDC and NHS act as a condensing agent system, first activating the carboxyl group of L-histidine to form an active ester intermediate. Subsequently, some amino groups on the silica surface undergo a nucleophilic addition reaction with this active ester, forming a stable amide bond. This covalently links the α-carboxyl group of the histidine to the silica particle surface while retaining the side chain imidazole group of the histidine. After the reaction is complete, silver ions from the added silver nitrate solution coordinate with the imidazole group to form a stable complex, with the nitrogen atom of the imidazole ring serving as the primary coordination site, thereby introducing silver ions with antimicrobial activity onto the surface.

[0020] Preferably, in step (2), the pH of the PBS buffer solution is 6-7, the concentration of the silver nitrate solution is 0.05-0.1 mol / L; and the dosage ratio of aminosilica, PBS buffer solution, EDC, NHS, L-histidine, deionized water, and silver nitrate is 10 g: 100-150 mL: 2-3 g: 1-1.5 g: 2-5 g: 100-150 mL: 1-3 g.

[0021] Preferably, in step (2), the stirring reaction conditions are 30-40° C. for 12-18 h; and the complexation reaction conditions are 4-7 h at room temperature.

[0022] (3) The intermediate silica is dispersed in an ethanol aqueous solution, and then 2,3-epoxypropyltrimethylammonium chloride and potassium carbonate are added, the temperature is raised to react, and the product is centrifuged, washed, and dried to obtain modified nano-silica.

[0023] Introduction of quaternary ammonium groups: Under alkaline conditions, the unreacted surface amino groups retained from the first two steps act as nucleophiles, attacking the epoxy groups in the 2,3-epoxypropyltrimethylammonium chloride molecule, covalently attaching the positively charged quaternary ammonium groups to the silica surface. The final product surface possesses two synergistic antimicrobial functional groups: silver ion-complexed histidine groups and quaternary ammonium groups. The former provides sustained-release antimicrobial activity, while the latter provides a contact bactericidal effect. These two mechanisms synergistically enhance the material's overall antimicrobial properties.

[0024] Preferably, in step (3), the volume ratio of ethanol to deionized water in the ethanol aqueous solution is 1-2:1; the usage ratio of the intermediate silicon dioxide, ethanol aqueous solution, 2,3-epoxypropyltrimethylammonium chloride, and potassium carbonate is 10 g: 100-150 mL: 2-5 g: 0.5-1.2 g.

[0025] Preferably, in step (3), the temperature-raising reaction condition is to raise the temperature to 55-70° C. and stir the reaction for 6-9 hours.

[0026] Preferably, the structuring control agent is hydrocarbon silicone oil, the cross-linking agent is hydrogen-containing silicone oil, the reaction delay agent is acetylene cycloethanol, and the platinum catalyst is 1,3-diethene-1,1,3,3-tetramethyldisiloxane complex.

[0027] The present invention also claims protection for a method for preparing the breathable and washable silicone bra sponge, comprising the following steps: placing the soft mesh polyurethane in a temperature environment of 110 to 130°C for pretreatment for 10 to 30 minutes to remove odor, and shaping the soft mesh polyurethane according to size and shape requirements; placing the raw materials in parts by weight of the formula in a premixing reactor, stirring and mixing until uniform, to obtain a liquid silicone rubber composite material; evenly and completely covering the silicone rubber composite material on the soft mesh polyurethane, and after cooling, sending it into a heating vulcanization device for vulcanization treatment at 130 to 150°C for 10 to 30 minutes to obtain the breathable and washable silicone bra sponge.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] 1. The breathable and washable silicone bra pad of the present invention adopts a double-layer composite structure design, with soft mesh polyurethane as the skeleton support, and the outer layer is completely covered with silicone rubber composite material, forming an ideal combination of soft touch and good elastic recovery. The silicone rubber wrapping layer has the characteristics of high temperature stability, non-toxic and odorless, which can effectively isolate oxygen and ultraviolet rays from the invasion of polyurethane, significantly improve the aging resistance of the material, and prevent yellowing and deformation; at the same time, the hydrophobic properties of silicone rubber greatly reduce the water absorption rate of the composite material, achieving a quick-drying and easy-to-clean effect, and can completely remove milk and sweat stains, meeting food-grade safety standards. The optimized ratio of silicone rubber and silicone oil ensures that the product has excellent flexibility and comfortable fit; modified silica not only provides antibacterial properties, but also acts as a reinforcing filler to significantly improve the mechanical properties and thermal stability of the material; light calcium carbonate acts as a functional filler to effectively adjust the density and hardness of the product while reducing costs; the structural control agent accurately controls the rheology and internal structure of the material; hydrogen-containing silicone oil acts as a cross-linking agent in synergy with a reaction delay agent and a platinum catalyst to achieve controllable cross-linking network formation. This multi-component synergistic formula design enables the product to achieve excellent water washing durability while maintaining breathability, solving industry pain points such as traditional bra cotton being easily deformed, non-breathable, and difficult to clean.

[0030] 2. The modified nano-silica of the present invention achieves efficient antibacterial dual functionality and significantly enhanced dispersibility through three steps of precisely controlled surface chemical modification. The first step is the KH550 coupling reaction to introduce an organic silane layer and amino functional groups on the silica surface, which greatly improves the dispersion uniformity of the nano-silica in the matrix and effectively inhibits agglomeration. The second step is to achieve directional grafting of L-histidine through amide bonds and form a complex structure with silver ions, so that the material has long-lasting sustained-release antibacterial properties. The third step is to introduce quaternary ammonium salt groups through epoxy ring-opening reaction to provide contact-type rapid sterilization function. This dual-functional synergistic sterilization mechanism significantly improves the breadth of the antibacterial spectrum and antibacterial efficiency. The silver ion complexation provides sustained-release antibacterial activity, and the quaternary ammonium salt provides a contact-type sterilization effect. The combined effect greatly extends the antibacterial duration. At the same time, by firmly binding the antibacterial components to the surface of the nano-carrier, it solves the industry problem that traditional antibacterial materials are easily precipitated in the silicone rubber matrix, resulting in a rapid decrease in antibacterial performance. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with the embodiments. Of course, the specific embodiments described here are only used to explain the present invention and are not used to limit the present invention.

[0032] Unless otherwise specified, the chemical reagents and materials in the present invention are purchased from commercial sources or synthesized from commercially purchased raw materials.

[0033] Methyl vinyl siloxane was purchased from Anhui Guibao Organic Silicone New Materials Co., Ltd., brand GX-172, with a molecular weight of 660,000 and a vinyl content of 0.16 wt%;

[0034] Vinyl silicone oil was purchased from Ningbo Runhe High-tech Materials Technology Co., Ltd., brand RH-Vi304;

[0035] Hydroxyl silicone oil was purchased from Jiangsu Quanli Chemical Co., Ltd., brand QL-203D, with a hydroxyl content of 4-5 wt%;

[0036] Hydrogenated silicone oil was purchased from Jiangsu Quanli Chemical Co., Ltd., brand QL-202, with a hydrogen content of 1 to 1.6 wt%;

[0037] Light calcium carbonate was purchased from Jiangxi Aote Fine Powder Co., Ltd., brand: DZ-1290;

[0038] Nano-silica was purchased from Jiangsu Huimai Powder Technology Co., Ltd.

[0039] A method for preparing a breathable and washable silicone bra sponge comprises the following steps:

[0040] (1) Dispersing 10 g of nano-silica into 100-150 mL of 95 wt% ethanol aqueous solution, then adding 1-4 g of KH550, stirring and reacting at 65-80° C. for 5-8 h, filtering, washing, and drying the product to obtain amino-modified nano-silica;

[0041] (2) Disperse 10 g of amino-silica in 100-150 mL of PBS buffer (pH = 6-7), add 2-3 g of EDC and 1-1.5 g of NHS, stir and activate, then add 2-5 g of L-histidine, stir and react at 30-40 ° C for 12-18 h, filter and wash the product, and redisperse it in 100-150 mL of deionized water. Add 1-3 g of 0.05-0.1 mol / L silver nitrate solution in the dark, stir and react at room temperature for 4-7 h, centrifuge and wash the product to obtain intermediate silica;

[0042] (3) Dispersing 10 g of the intermediate silica in 100-150 mL of ethanol aqueous solution (the volume ratio of ethanol to deionized water is 1-2:1), then adding 2-5 g of 2,3-epoxypropyltrimethylammonium chloride and 0.5-1.2 g of potassium carbonate, heating to 55-70 ° C and stirring for 6-9 h, centrifuging, washing, and drying the product to obtain modified nano-silica;

[0043] (4) placing the soft mesh polyurethane in a temperature environment of 110 to 130° C. for pretreatment for 10 to 30 minutes to remove odor, and shaping the soft mesh polyurethane according to size and shape requirements; placing 30 to 45 parts of silicone rubber, 30 to 45 parts of silicone oil, 6 to 15 parts of modified silica, 10 to 25 parts of light calcium carbonate, 0.1 to 2 parts of hydrocarbon silicone oil, 2 to 5 parts of hydrogen-containing silicone oil, 0.01 to 0.1 parts of acetylene cycloethanol, and 0.05 to 0.5 parts of 1,3-diethylene-1,1,3,3-tetramethyldisiloxane complex in a premixing reactor, stirring and mixing until uniform, to obtain a liquid silicone rubber composite material; uniformly and completely covering the silicone rubber composite material on the soft mesh polyurethane, and after cooling, sending it into a heating vulcanization equipment for vulcanization treatment at 130 to 150° C. for 10 to 30 minutes to obtain the breathable and washable silicone bra pad.

[0044] The present invention will be further described below with reference to specific examples.

[0045] Example 1

[0046] A method for preparing a breathable and washable silicone bra sponge comprises the following steps:

[0047] (1) Disperse 10 g of nano-silica into 150 mL of 95 wt% ethanol aqueous solution, then add 4 g of KH550, and stir the mixture at 80° C. for 5 h. Filter, wash, and dry the product to obtain amino-modified nano-silica.

[0048] (2) 10 g of amino-silica was dispersed in 150 mL of PBS buffer (pH = 6.5), 3 g of EDC and 1.5 g of NHS were added, and the mixture was stirred for activation. Subsequently, 5 g of L-histidine was added, and the mixture was stirred and reacted at 40 ° C for 12 h. The product was filtered, washed with water, and redispersed in 150 mL of deionized water. 3 g of 0.1 mol / L silver nitrate solution was added in the dark, and the mixture was stirred and reacted at room temperature for 4 h. The product was centrifuged and washed to obtain the intermediate silica.

[0049] (3) 10 g of the intermediate silica was dispersed in 150 mL of ethanol-water solution (the volume ratio of ethanol to deionized water was 2:1), and then 5 g of 2,3-epoxypropyltrimethylammonium chloride and 1.2 g of potassium carbonate were added. The temperature was raised to 70 °C and stirred for 6 h. The product was centrifuged, washed, and dried to obtain modified nano-silica.

[0050] (4) The soft mesh polyurethane is placed in a temperature environment of 120°C for pretreatment for 20 minutes to remove odor, and the soft mesh polyurethane is shaped according to size and shape requirements (thickness 30 mm, width 500 mm, length 1500 mm); 4500 g of methyl vinyl siloxane, 4500 g of vinyl silicone oil, 1500 g of modified silica, 2500 g of light calcium carbonate, 200 g of hydrocarbon silicone oil, 500 g of hydrogen-containing silicone oil, 10 g of acetylene cycloethanol, and 50 g of 1,3-diethylene-1,1,3,3-tetramethyldisiloxane complex are placed in a premixing reactor and stirred until uniform to obtain a liquid silicone rubber composite material; the silicone rubber composite material is evenly and completely covered on the soft mesh polyurethane, and after cooling, it is sent into a heating vulcanization equipment for vulcanization treatment at 130°C for 10 minutes to obtain the breathable and washable silicone bra pad.

[0051] Example 2

[0052] A method for preparing a breathable and washable silicone bra sponge comprises the following steps:

[0053] (1) Disperse 10 g of nano-silica into 150 mL of 95 wt% ethanol aqueous solution, then add 3 g of KH550, and stir the mixture at 75° C. for 6 h. Filter, wash, and dry the product to obtain amino-modified nano-silica.

[0054] (2) 10 g of amino-silica was dispersed in 150 mL of PBS buffer (pH = 6.5), 2.5 g of EDC and 1.4 g of NHS were added, and the mixture was stirred for activation. Subsequently, 4 g of L-histidine was added, and the mixture was stirred and reacted at 36°C for 14 h. The product was filtered, washed with water, and redispersed in 150 mL of deionized water. 2 g of 0.1 mol / L silver nitrate solution was added in the dark, and the mixture was stirred and reacted at room temperature for 5 h. The product was centrifuged and washed to obtain the intermediate silica.

[0055] (3) 10 g of the intermediate silica was dispersed in 150 mL of ethanol-water solution (the volume ratio of ethanol to deionized water was 2:1), and then 4 g of 2,3-epoxypropyltrimethylammonium chloride and 1 g of potassium carbonate were added. The temperature was raised to 65 °C and stirred for 7 h. The product was centrifuged, washed, and dried to obtain modified nano-silica.

[0056] (4) The soft mesh polyurethane is placed in a temperature environment of 120°C for pretreatment for 20 minutes to remove odor, and the soft mesh polyurethane is shaped according to size and shape requirements (thickness 30 mm, width 500 mm, length 1500 mm); 4000 g of methyl vinyl siloxane, 4000 g of vinyl silicone oil, 1200 g of modified silica, 2000 g of light calcium carbonate, 140 g of hydrocarbon silicone oil, 400 g of hydrogen-containing silicone oil, 8 g of acetylene cycloethanol, and 40 g of 1,3-diethylene-1,1,3,3-tetramethyldisiloxane complex are placed in a premixing reactor and stirred until uniform to obtain a liquid silicone rubber composite material; the silicone rubber composite material is evenly and completely covered on the soft mesh polyurethane, and after cooling, it is sent into a heating vulcanization equipment for vulcanization treatment at 135°C for 15 minutes to obtain the breathable and washable silicone bra pad.

[0057] Example 3

[0058] A method for preparing a breathable and washable silicone bra sponge comprises the following steps:

[0059] (1) Dispersing 10 g of nano-silica into 150 mL of 95 wt% ethanol aqueous solution, then adding 2 g of KH550, stirring and reacting at 70° C. for 7 h, filtering, washing, and drying the product to obtain amino-modified nano-silica;

[0060] (2) 10 g of amino-silica was dispersed in 150 mL of PBS buffer (pH = 6.5), 2.5 g of EDC and 1.2 g of NHS were added, and the mixture was stirred for activation. Subsequently, 3 g of L-histidine was added, and the mixture was stirred and reacted at 34 ° C for 16 h. The product was filtered, washed with water, and redispersed in 150 mL of deionized water. 2 g of 0.1 mol / L silver nitrate solution was added in the dark, and the mixture was stirred and reacted at room temperature for 6 h. The product was centrifuged and washed to obtain the intermediate silica.

[0061] (3) 10 g of the intermediate silica was dispersed in 150 mL of ethanol-water solution (the volume ratio of ethanol to deionized water was 2:1), and then 3 g of 2,3-epoxypropyltrimethylammonium chloride and 0.8 g of potassium carbonate were added. The temperature was raised to 60 °C and stirred for 8 h. The product was centrifuged, washed, and dried to obtain modified nano-silica.

[0062] (4) The soft mesh polyurethane is placed in a temperature environment of 120°C for pretreatment for 20 minutes to remove odor, and the soft mesh polyurethane is shaped according to size and shape requirements (thickness 30 mm, width 500 mm, length 1500 mm); 3500 g of methyl vinyl siloxane, 3500 g of vinyl silicone oil, 900 g of modified silica, 1500 g of light calcium carbonate, 80 g of hydrocarbon silicone oil, 300 g of hydrogen-containing silicone oil, 4 g of acetylene cycloethanol, and 20 g of 1,3-diethylene-1,1,3,3-tetramethyldisiloxane complex are placed in a premixing reactor and stirred until uniform to obtain a liquid silicone rubber composite material; the silicone rubber composite material is evenly and completely covered on the soft mesh polyurethane, and after cooling, it is sent into a heating vulcanization equipment for vulcanization treatment at 140°C for 18 minutes to obtain the breathable and washable silicone bra pad.

[0063] Example 4

[0064] A method for preparing a breathable and washable silicone bra sponge comprises the following steps:

[0065] (1) Disperse 10 g of nano-silica into 150 mL of 95 wt% ethanol aqueous solution, then add 1 g of KH550, and stir the mixture at 65° C. for 5 h. Filter, wash, and dry the product to obtain amino-modified nano-silica.

[0066] (2) 10 g of amino-silica was dispersed in 150 mL of PBS buffer (pH = 6.5), 2 g of EDC and 1 g of NHS were added, and the mixture was stirred for activation. Subsequently, 2 g of L-histidine was added, and the mixture was stirred and reacted at 30°C for 12 h. The product was filtered, washed with water, and redispersed in 150 mL of deionized water. 1 g of 0.1 mol / L silver nitrate solution was added in the dark, and the mixture was stirred and reacted at room temperature for 4 h. The product was centrifuged and washed to obtain the intermediate silica.

[0067] (3) 10 g of the intermediate silica was dispersed in 150 mL of ethanol-water solution (the volume ratio of ethanol to deionized water was 2:1), and then 2 g of 2,3-epoxypropyltrimethylammonium chloride and 0.5 g of potassium carbonate were added. The temperature was raised to 55 °C and stirred for 9 h. The product was centrifuged, washed, and dried to obtain modified nano-silica.

[0068] (4) The soft mesh polyurethane is placed in a temperature environment of 120°C for pretreatment for 20 minutes to remove odor, and the soft mesh polyurethane is shaped according to size and shape requirements (thickness 30 mm, width 500 mm, length 1500 mm); 3000 g of methyl vinyl siloxane, 3000 g of vinyl silicone oil, 600 g of modified silica, 1000 g of light calcium carbonate, 10 g of hydrocarbon silicone oil, 200 g of hydrogen-containing silicone oil, 1 g of acetylene cycloethanol, and 5 g of 1,3-diethylene-1,1,3,3-tetramethyldisiloxane complex are placed in a premixing reactor and stirred until uniform to obtain a liquid silicone rubber composite material; the silicone rubber composite material is evenly and completely covered on the soft mesh polyurethane, and after cooling, it is sent into a heating vulcanization equipment for vulcanization treatment at 145°C for 20 minutes to obtain the breathable and washable silicone bra pad.

[0069] Comparative Example 1

[0070] A method for preparing a breathable and washable silicone bra sponge comprises the following steps:

[0071] (1) Disperse 10 g of nano-silica into 150 mL of 95 wt% ethanol aqueous solution, then add 4 g of KH550, and stir the mixture at 80° C. for 5 h. Filter, wash, and dry the product to obtain amino-modified nano-silica.

[0072] (2) 10 g of amino-silica was dispersed in 150 mL of PBS buffer (pH = 6.5), 3 g of EDC and 1.5 g of NHS were added, and the mixture was stirred for activation. Subsequently, 5 g of L-histidine was added, and the mixture was stirred and reacted at 40 ° C for 12 h. The product was filtered, washed with water, and redispersed in 150 mL of deionized water. 3 g of 0.1 mol / L silver nitrate solution was added in the dark, and the mixture was stirred and reacted at room temperature for 4 h. The product was centrifuged and washed to obtain the intermediate silica.

[0073] (3) The soft mesh polyurethane is placed in a temperature environment of 120°C for pretreatment for 20 minutes to remove odor, and the soft mesh polyurethane is shaped according to size and shape requirements (thickness 30 mm, width 500 mm, length 1500 mm); 4500 g of methyl vinyl siloxane, 4500 g of vinyl silicone oil, 1500 g of intermediate silicon dioxide, 2500 g of light calcium carbonate, 200 g of hydrocarbon silicone oil, 500 g of hydrogen-containing silicone oil, 10 g of acetylene cycloethanol, and 50 g of 1,3-diethylene-1,1,3,3-tetramethyldisiloxane complex are placed in a premixing reactor and stirred until uniform to obtain a liquid silicone rubber composite material; the silicone rubber composite material is evenly and completely covered on the soft mesh polyurethane, and after cooling, it is sent into a heating vulcanization equipment for vulcanization treatment at 130°C for 10 minutes to obtain the breathable and washable silicone bra pad.

[0074] Comparative Example 2

[0075] A method for preparing a breathable and washable silicone bra sponge comprises the following steps:

[0076] (1) Disperse 10 g of nano-silica into 150 mL of 95 wt% ethanol aqueous solution, then add 4 g of KH550, and stir the mixture at 80° C. for 5 h. Filter, wash, and dry the product to obtain amino-modified nano-silica.

[0077] (2) The soft mesh polyurethane is placed in a temperature environment of 120°C for pretreatment for 20 minutes to remove odor, and the soft mesh polyurethane is shaped according to size and shape requirements (thickness 30 mm, width 500 mm, length 1500 mm); 4500 g of methyl vinyl siloxane, 4500 g of vinyl silicone oil, 1500 g of amino-modified nano-silica, 2500 g of light calcium carbonate, 200 g of hydrocarbon silicone oil, 500 g of hydrogen-containing silicone oil, 10 g of acetylene cycloethanol, and 50 g of 1,3-diethylene-1,1,3,3-tetramethyldisiloxane complex are placed in a premixing reactor and stirred until uniform to obtain a liquid silicone rubber composite material; the silicone rubber composite material is evenly and completely covered on the soft mesh polyurethane, and after cooling, it is sent into a heating vulcanization equipment for vulcanization treatment at 130°C for 10 minutes to obtain the breathable and washable silicone bra pad.

[0078] The bra cotton prepared in Examples 1 to 4 and Comparative Examples 1 to 2 was subjected to performance tests, and the tensile strength was tested with reference to ASTM-D3574, the elongation at break was tested with reference to ASTM-D3574, the SAG (sag parameter) value was tested with reference to ISO 2439-B, the thickness loss after 80,000 compressions was tested with reference to ISO 3385:2014, and the hardness loss after 80,000 compressions was tested with reference to ISO 3385:2014; the water absorption was tested with reference to GB / T 10299-2011, and the antibacterial performance was tested with reference to GB 15979-2002. The specific data are shown in Table 1.

[0079] Table 1 Chest circumference cotton performance test results

[0080]

[0081] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A breathable and washable silicone bra sponge, comprising a soft mesh polyurethane and a silicone rubber composite material completely covering the surface of the soft mesh polyurethane, characterized in that: The silicone rubber composite material is made of the following components in parts by weight: 30-45 parts of silicone rubber, 30-45 parts of silicone oil, 6-15 parts of modified silicon dioxide, 10-25 parts of light calcium carbonate, 0.1-2 parts of a structuring control agent, 2-5 parts of a cross-linking agent, 0.01-0.1 parts of a reaction delay agent, and 0.05-0.5 parts of a platinum catalyst.

2. The breathable and washable silicone bra sponge according to claim 1, characterized in that: The preparation method of the modified silicon dioxide comprises the following steps: (1) dispersing nano-silica into an ethanol aqueous solution, then adding KH550, stirring to react, filtering, washing, and drying the product to obtain amino-modified nano-silica; (2) dispersing the amino-silica in PBS buffer, adding EDC and NHS, stirring to activate, then adding L-histidine, stirring to react, filtering the product, washing with water, and redispersing it in deionized water, adding silver nitrate solution in the dark, complexing reaction, centrifuging and washing the product to obtain intermediate silica; (3) The intermediate silica is dispersed in an ethanol aqueous solution, and then 2,3-epoxypropyltrimethylammonium chloride and potassium carbonate are added, the temperature is raised to react, and the product is centrifuged, washed, and dried to obtain modified nano-silica.

3. The breathable and washable silicone bra sponge according to claim 2, characterized in that: In step (1), the concentration of the ethanol aqueous solution is 95wt%; the usage ratio of nano-silica, ethanol aqueous solution, and KH550 is 10g:100-150mL:1-4g.

4. The breathable and washable silicone bra sponge according to claim 2, characterized in that: In step (1), the stirring reaction condition is 65-80° C. for 5-8 h.

5. The breathable and washable silicone bra sponge according to claim 2, characterized in that: In step (2), the pH of the PBS buffer solution is 6-7, the concentration of the silver nitrate solution is 0.05-0.1 mol / L; the dosage ratio of amino silica, PBS buffer solution, EDC, NHS, L-histidine, deionized water, and silver nitrate is 10 g: 100-150 mL: 2-3 g: 1-1.5 g: 2-5 g: 100-150 mL: 1-3 g.

6. The breathable and washable silicone bra sponge according to claim 2, characterized in that: In step (2), the stirring reaction conditions are 30-40° C. for 12-18 h; and the complexation reaction conditions are room temperature for 4-7 h.

7. The breathable and washable silicone bra sponge according to claim 2, characterized in that: In step (3), the volume ratio of ethanol to deionized water in the ethanol aqueous solution is 1-2:1; the usage ratio of the intermediate silicon dioxide, the ethanol aqueous solution, 2,3-epoxypropyltrimethylammonium chloride, and potassium carbonate is 10 g: 100-150 mL: 2-5 g: 0.5-1.2 g.

8. The breathable and washable silicone bra sponge according to claim 2, characterized in that: In step (3), the temperature reaction condition is to heat the reaction to 55-70° C. and stir the reaction for 6-9 hours.

9. The breathable and washable silicone bra sponge according to claim 1, characterized in that: The structuring control agent is hydrocarbon-based silicone oil, the cross-linking agent is hydrogen-containing silicone oil, the reaction delay agent is acetylene cycloethanol, and the platinum catalyst is 1,3-diethene-1,1,3,3-tetramethyldisiloxane complex.

10. A method for preparing the breathable and washable silicone bra sponge according to any one of claims 1 to 9, characterized in that: The following steps are involved: The soft mesh polyurethane is placed in a temperature environment of 110 to 130° C. for pretreatment for 10 to 30 minutes to remove odor, and the soft mesh polyurethane is shaped according to size and shape requirements; the raw materials in parts by weight of the formula are placed in a premixing reactor, stirred and mixed until uniform, to obtain a liquid silicone rubber composite material; the silicone rubber composite material is evenly and completely covered on the soft mesh polyurethane, and after cooling, it is sent into a heating vulcanization equipment for vulcanization treatment at 130 to 150° C. for 10 to 30 minutes to obtain the breathable and washable silicone bra sponge.

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