Silica gel as well as preparation method and application thereof

Abstract

The invention discloses silica gel as well as a preparation method and application thereof, and relates to the technical field of materials. The silica gel is composed of a component A and a component B, the component A is prepared from the following components in parts by weight: 6 to 17 parts of vinyl silicone oil I, 30 to 45 parts of organic silicon-based adhesive I, 0.4 to 1.0 part of platinum catalyst and 0.02 to 0.10 part of inhibitor; and the component B comprises the following components in parts by weight: 0-3 parts of vinyl silicone oil II, 30-45 parts of organic silicon-based adhesive II and 5-20 parts of hydrogen-containing silicone oil. The semi-liquid silica gel prepared by the invention has good flexibility after being cured, and does not yellow after being subjected to high-temperature, high-humidity and long-time aging; the material is used for the steel ring of the seamless underwear, can replace a traditional steel ring to play a supporting role, and can also replace a traditional rubber band to serve as an elastic band to play a fixing role. The silica gel material can be tightly fixed on the inner and outer fabrics of the underwear, so that the underwear does not need suture lines any more, and is more attractive, soft, close-fitting and skin-friendly.

Description

Technical Field

[0001] The present application relates to the field of material technology, and in particular to a silica gel and a preparation method and application thereof. Background Art

[0002] For a long time, most bras on the market used an underwire as the cup holder, sponge as the inner padding, and rubber bands as the elastic band. This outdated technology is gradually being phased out by the market. There are many reasons for this, including the underwire being too hard and easily puncturing or abrading the skin; the sponge quality being inconsistent and prone to absorbing moisture and breeding bacteria and viruses; and the rubber bands requiring thread to sew, which is cumbersome and unsightly.

[0003] Currently, "seamless" bras without underwires, sponges, or even elastic bands are extremely popular. These bras are free of underwires, sponges, elastic bands, stitches, or boning, and even the labels are invisible. Seamless bras transition seamlessly from the front to the back and sides, as if they were 3D printed. They are comfortable to wear and have received widespread acclaim from consumers. Also known as "jelly strip" bras, these "seamless" bras utilize high-strength, high-elasticity "jelly strips" instead of underwires and elastic bands. The material is incredibly soft, conforms perfectly, and provides a comfortable fit without feeling oppressive.

[0004] Jelly bars are formed by curing jelly bar glue, the main component of which is reactive polyurethane hot melt adhesive (PUR). PUR material has high strength and high elasticity, but its flexibility is poor at low temperatures. In addition, PUR tends to yellow over time. Summary of the Invention

[0005] The main purpose of this application is to provide a silica gel and its preparation method and application, so as to solve the problems of poor softness and easy yellowing of silica gel in the prior art.

[0006] In order to achieve the above-mentioned object, according to one aspect of the present application, a silica gel is provided, comprising component A and component B;

[0007] Component A comprises the following raw materials in parts by weight: 6 to 17 parts of vinyl silicone oil I, 30 to 45 parts of silicone-based adhesive I, 0.4 to 1.0 parts of platinum catalyst, and 0.02 to 0.10 parts of inhibitor;

[0008] Calculated in parts by weight, component B includes the following raw materials: 0 to 3 parts of vinyl silicone oil II, 30 to 45 parts of organic silicone base glue II, and 5 to 20 parts of hydrogen-containing silicone oil.

[0009] Furthermore, the weight portion of vinyl silicone oil I is 8 to 16 parts, the weight portion of silicone-based adhesive I is 33 to 40 parts, the weight portion of platinum catalyst is 0.5 to 0.9 parts, and the weight portion of inhibitor is 0.03 to 0.08 parts.

[0010] Furthermore, the weight portion of the vinyl silicone oil II is 1 to 3 parts, the weight portion of the silicone-based adhesive II is 32 to 43 parts, and the weight portion of the hydrogenated silicone oil is 7 to 18 parts.

[0011] Furthermore, the weight ratio of component A to component B is (0.8-1.2):1.

[0012] Furthermore, the weight portion of vinyl silicone oil I is 10 to 16 parts, the weight portion of silicone-based adhesive I is 35 to 39 parts, the weight portion of platinum catalyst is 0.6 to 0.9 parts, and the weight portion of inhibitor is 0.03 to 0.06 parts.

[0013] Furthermore, the weight portion of vinyl silicone oil II is 1 to 2 parts, the weight portion of silicone-based adhesive II is 34 to 43 parts, and the weight portion of hydrogenated silicone oil is 8 to 16 parts.

[0014] Furthermore, the weight ratio of component A to component B is (0.9-1.1):1.

[0015] Furthermore, the weight ratio of vinyl silicone oil I to hydrogen-containing silicone oil is (0.5-2.3):1.

[0016] Furthermore, the weight ratio of vinyl silicone oil II to hydrogen-containing silicone oil is (0.05-0.45):1.

[0017] Furthermore, the weight ratio of the total amount of vinyl silicone oil I and vinyl silicone oil II to the hydrogen-containing silicone oil is (1.0-2.0):1.

[0018] Furthermore, the weight ratio of the silicone-based adhesive I to the hydrogenated silicone oil is (1.6-5.8):1.

[0019] Furthermore, the weight ratio of the silicone-based adhesive II to the hydrogenated silicone oil is (1.7-6.2):1.

[0020] Furthermore, the weight ratio of the total amount of the silicone-based adhesive I and the silicone-based adhesive II to the hydrogenated silicone oil is (3.0-12.0):1.

[0021] Furthermore, the weight ratio of the platinum catalyst to the inhibitor is (10-50):1.

[0022] Furthermore, the viscosity of vinyl silicone oil I and vinyl silicone oil II is 200 to 20,000 mPa·s, respectively; preferably 500 to 15,000 mPa·s.

[0023] Furthermore, the number average molecular weights of the vinyl silicone oil I and the vinyl silicone oil II are respectively 10,000 to 90,000, and preferably 20,000 to 80,000.

[0024] Furthermore, the vinyl content in the vinyl silicone oil I and the vinyl silicone oil II is 0.09 to 1.1 wt %, respectively; preferably 0.15 to 0.8 wt %.

[0025] Furthermore, the silica content in silicone-based adhesive I and silicone-based adhesive II is 20wt% to 40wt% respectively; preferably 25wt% to 35wt%; the remainder is vinyl silicone oil III, totaling 100%; the viscosity of vinyl silicone oil III is 4500 to 5500 mPa·s.

[0026] Furthermore, the platinum catalyst is a polyvinyl silicone oil solution of divinyltetramethyldisiloxane-platinum complex.

[0027] Furthermore, the platinum content in the platinum catalyst is 0.1 to 0.9 wt%, preferably 0.2 wt% to 0.8 wt%.

[0028] Furthermore, the hydrogen content of the hydrogen-containing silicone oil is 0.01 wt% to 0.40 wt%, preferably 0.05 wt% to 0.20 wt%.

[0029] Furthermore, the inhibitor is at least one of vinyl ring, 1-ethynylcyclohexanol and diallyl maleate.

[0030] According to the second aspect of the present application, a method for preparing the above-mentioned silica gel is provided, comprising:

[0031] Step S1: Mix the raw materials according to the proportions of the raw materials in component A to obtain a component A mixture;

[0032] Step S2: mixing the raw materials according to the proportions of the raw materials in component B to obtain a component B mixture;

[0033] Step S3: When in use, the component A mixture and the component B mixture are mixed in a weight ratio of (0.8-1.2):1 to obtain silica gel.

[0034] According to a third aspect of the present application, there is provided the use of the above-mentioned silica gel or the silica gel prepared by the above-mentioned preparation method in seamless underwear.

[0035] Furthermore, the material of the steel ring and / or rubber band in the seamless underwear is silicone.

[0036] Furthermore, the molding method of the steel ring and / or rubber band includes: first drawing silicone on the position of the prefabricated steel ring and / or prefabricated rubber band on the underwear fabric, then covering it with a layer of fabric, and finally hot pressing and curing it to obtain the steel ring and / or rubber band on the seamless underwear.

[0037] The technical solution of this application provides a silica gel, a preparation method, and its application. The semi-liquid silica gel, obtained by reacting vinyl silicone oil, silicone-based adhesive, hydrogenated silicone oil, a platinum catalyst, and an inhibitor, exhibits excellent flexibility after curing and does not yellow after exposure to high temperature, high humidity, and prolonged aging. This material can be used in the underwire of seamless underwear, replacing traditional underwires for support and also replacing traditional rubber bands as elastic bands for securing. This silica gel material can be tightly fixed to the inner and outer fabric layers of underwear, eliminating the need for sutures and making the underwear more aesthetically pleasing, softer, more form-fitting, and skin-friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The drawings in the specification, which constitute a part of this application, are used to provide further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute improper limitations on this application.

[0039] Figure 1 This is a schematic diagram of the seamless underwear structure in the application example of this application.

[0040] Reference numerals:

[0041] 1. Bra body; 2. Silicone underwire; 3. Silicone rubber band. DETAILED DESCRIPTION

[0042] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and embodiments.

[0043] As mentioned in the background art, the conventional material for the steel rings and rubber bands in seamless underwear is reactive polyurethane hot melt adhesive (PUR). This material has poor softness and will turn yellow after long-term use. It is less comfortable to use and is not good for health.

[0044] In order to achieve the above-mentioned object, according to one aspect of the present application, a silica gel is provided, comprising component A and component B;

[0045] Component A comprises the following raw materials in parts by weight: 6 to 17 parts of vinyl silicone oil I, 30 to 45 parts of silicone-based adhesive I, 0.4 to 1.0 parts of platinum catalyst, and 0.02 to 0.10 parts of inhibitor;

[0046] Calculated in parts by weight, component B includes the following raw materials: 0 to 3 parts of vinyl silicone oil II, 30 to 45 parts of organic silicone base glue II, and 5 to 20 parts of hydrogen-containing silicone oil.

[0047] The present application designs appropriate reaction raw materials and regulates the ratio between the reaction components. For example, the weight of vinyl silicone oil I is any value among 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17 or a range between any two of them; the weight of silicone-based adhesive I is any value among 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45 or a range between any two of them; the weight of platinum catalyst is any value among 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0 or a range between any two of them; the weight of inhibitor is 0.02, 0.0 3, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, 0.10, or any range between any two of them; the weight portion of vinyl silicone oil II is any value among 0, 1, 2, 3, or any range between any two of them; the weight portion of silicone base glue II is any value among 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, or any range between any two of them; the weight portion of hydrogenated silicone oil is any value among 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, or any range between any two of them. The above-mentioned ratio ensures that the semi-liquid silicone has suitable hardness, softness, toughness and strength after curing; at the same time, the selected silicone polymer chain is composed of Si-O-Si, and the bond energy is greater than that of CC bond, CN bond and CO bond, so it has better high-temperature resistance and will not turn yellow after aging; the bond angle and bond length of Si-O-Si are also greater than that of CC bond, which is easier to stretch and rotate. Therefore, the prepared silicone material has a lower glass transition temperature (Tg) value and is softer at low temperatures.

[0048] Components A and B provided in the present application will react and solidify at room temperature after mixing. Therefore, the vinyl silicone oil catalyst and inhibitor are placed in component A, and the vinyl silicone oil and hydrogen-containing silicone oil are placed in component B. In this way, components A and B will not react at room temperature, which is convenient for storage. In addition, according to the above ratio, the densities of components A and B are the same or similar. When used, the materials are added by equal volume injection, and the actual materials added are added by weight in a 1:1 ratio.

[0049] The vinyl silicone oil I and vinyl silicone oil II are reactive silicone oils containing vinyl groups.

[0050] For example, the structural formula is: For another example, the material model is RH-304Vi, and the purchasing manufacturer is Zhejiang Runhe Silicone New Materials Co., Ltd.

[0051] The above-mentioned hydrogen-containing silicone oil is a reactive silicone oil containing Si—H bonds.

[0052] For example, the structural formula is:

[0053]

[0054] For another example, the model is RH-H57, and the purchasing manufacturer is Zhejiang Runhe Silicone New Materials Co., Ltd.

[0055] The above-mentioned silicone base adhesive I and silicone base adhesive II are mixed products of reactive silicone oil containing vinyl and a reinforcing agent. After curing, they can also form high-strength and high-elasticity materials. The tensile strength and elongation of the silicone base adhesive itself are similar to those of PUR materials. For example, the model is RH-A200, and the manufacturer purchased is Zhejiang Runhe Silicone New Materials Co., Ltd.; the platinum catalyst is used to catalyze the cross-linking reaction between vinyl silicone oil I, vinyl silicone oil II, silicone base adhesive I, silicone base adhesive II and hydrogen-containing silicone oil. The active ingredient is platinum-divinyltetramethyldisiloxane complex (structure: ) silicone oil solution; for example, a Pt content of 3000ppm, model K3000, purchased from Heraeus Precious Metals Co., Ltd.; the inhibitor is used to suppress the reaction rate of the reactants at room temperature within a short period of time to facilitate practical application. The semi-liquid silicone rubber obtained by reacting vinyl silicone oil, silicone-based adhesive, hydrogenated silicone oil, platinum catalyst, and inhibitor exhibits excellent flexibility after curing and does not yellow after exposure to high temperature, high humidity, and long-term aging. By separating components A and B and storing them separately, the product's shelf life can be extended, allowing for remixing and application upon use.

[0056] In some embodiments, component A comprises 8 to 16 parts by weight of vinyl silicone oil I, 33 to 40 parts by weight of silicone base adhesive I, 0.5 to 0.9 parts by weight of platinum catalyst, and 0.03 to 0.08 parts by weight of inhibitor; and component B comprises 1 to 3 parts by weight of vinyl silicone oil II, 32 to 43 parts by weight of silicone base adhesive II, and 7 to 18 parts by weight of hydrogenated silicone oil. The mixing ratio of component A to component B is (0.8 to 1.2):1. By further adjusting the ratio of the raw materials in the two components, the silicone rubber is optimized to have appropriate softness or reasonable hardness, tensile strength, elongation, and tear strength while meeting the requirements of use, and does not yellow after aging for 1000 hours in a high temperature, high humidity environment.

[0057] In some embodiments, component A comprises 10-16 parts by weight of vinyl silicone oil I, 35-39 parts by weight of silicone base adhesive I, 0.6-0.9 parts by weight of platinum catalyst, and 0.03-0.06 parts by weight of inhibitor; component B comprises 1-2 parts by weight of vinyl silicone oil II, 34-43 parts by weight of silicone base adhesive II, and 8-16 parts by weight of hydrogenated silicone oil; and the mixing ratio of component A to component B is (0.9-1.1):1. By further adjusting the ratio of the raw materials in the two components, the silicone rubber can be made to have suitable softness, reasonable hardness, tensile strength, elongation, and tear strength while meeting the requirements of use, and it will not yellow after aging for 1000 hours in a high temperature and high humidity environment.

[0058] In some embodiments, component A comprises 11-16 parts by weight of vinyl silicone oil I, 34-38.5 parts by weight of silicone base adhesive I, 0.7-0.9 parts by weight of platinum catalyst, and 0.03-0.05 parts by weight of inhibitor; and component B comprises 1-2 parts by weight of vinyl silicone oil II, 35-43 parts by weight of silicone base adhesive II, and 8-15 parts by weight of hydrogenated silicone oil; the mixing ratio of component A to component B is 1:1. By further adjusting the ratio of the raw materials in the two components, the prepared silicone product is very soft while also possessing suitable mechanical strength and elasticity. It has a lower hardness than PUR and does not yellow after aging for 1000 hours in a high temperature and high humidity environment. It is used in underwear adhesive strips and offers improved comfort, smoothness, skin-friendliness, and adhesion.

[0059] In some embodiments, the weight ratio of vinyl silicone oil I to hydrogenated silicone oil is (0.5-2.3):1; the weight ratio of vinyl silicone oil II to hydrogenated silicone oil is (0.05-0.45):1; and the weight ratio of the total amount of vinyl silicone oil I and vinyl silicone oil II to hydrogenated silicone oil is (1.0-2.0):1. By regulating the ratio of vinyl silicone oil I in component A and the hydrogenated silicone oil in component B, a hydrosilylation reaction occurs between the two under the catalysis of a catalyst at a certain temperature. During the reaction, the double bonds (vinyl groups) in the vinyl silicone oil react with the hydrogen atoms (hydrogen atoms connected to silicon atoms) in the hydrogenated silicone oil to form Si-C bonds, thereby constructing a three-dimensional crosslinked network. Adjusting the ratio of vinyl silicone oil to hydrogenated silicone oil directly affects the crosslinking density. Increasing the proportion of hydrogenated silicone oil can increase the crosslinking density, thereby increasing the hardness of the rubber. Conversely, a higher proportion of vinyl silicone oil results in a lower crosslink density, making the resulting rubber softer. This appropriate reaction ratio ensures the resulting silicone rubber possesses excellent elasticity. Excessively high or low crosslink densities can lead to decreased elasticity: too high can make the material brittle, while too low can result in insufficient elasticity. The degree of crosslink network formation influences the material's strength. Appropriate crosslinking can improve the tensile and tear strength of silicone rubber. The reaction ratio also affects cure speed. Increasing the proportion of hydrogenated silicone oil can accelerate cure because more hydrogen atoms can react more quickly with the vinyl groups. However, excessively fast cure speeds can affect the handling time (open time) and cure uniformity during product preparation. Silicone rubber exhibits better yellowing resistance than other thermoplastic elastomers, such as polyurethane. The reaction ratio also influences the surface feel and smoothness of the final product. When used in underwear construction, these surface properties are crucial for wearer comfort. When preparing skin-friendly silicone rubber for underwear, precisely controlling the reaction ratio of vinyl and hydrogenated silicone oils can produce a material that exhibits high elasticity and strength without yellowing and a pleasant surface feel.

[0060] In some embodiments, the weight ratio of silicone base I to hydrogenated silicone oil is (1.6-5.8):1; the weight ratio of silicone base II to hydrogenated silicone oil is (1.7-6.2):1; and the weight ratio of the total amount of silicone base I and silicone base II to hydrogenated silicone oil is (3.0-12.0):1. When adding silica gel prepared by regulating the reaction ratio of the silicone base and hydrogenated silicone oil, the more hydrogen atoms in the hydrogenated silicone oil, the more sites that can react with vinyl groups, and the more crosslinking points formed, which increases the hardness of the product. On the contrary, if the vinyl content in the silicone-based adhesive is high and the hydrogen atom content of the hydrogen-containing silicone oil is low, the product will be relatively soft; the above ratio regulated by the present application has an appropriate cross-linking density, which can provide good elasticity; if the cross-linking density is too high, the material may become brittle and hard, and the elasticity will be reduced; if the cross-linking density is too low, the elasticity is also insufficient, and the material may become too soft and lack the ability to maintain its shape; the cross-linking density affects the mechanical strength of the product, including tensile strength, tear strength and compressive strength; the silicone-based adhesive itself has excellent temperature resistance, and increasing the cross-linking density helps to improve the temperature resistance; the silicone-based adhesive is not easy to turn yellow under aging conditions; the surface properties have good touch, smoothness and stickiness. This silica gel is used in skin-friendly underwear-specific silica gel. The above-mentioned appropriate reaction ratio further optimizes the softness, yellowing resistance, and adhesion to other materials (such as textiles) on the basis of maintaining high strength and high elasticity to ensure the comfort and aesthetics of the final product.

[0061] In some embodiments, the viscosity of vinyl silicone oil I and vinyl silicone oil II is 200-20,000 mPa·s, respectively; preferably 500-15,000 mPa·s, for example, any value selected from 200, 500, 800, 1000, 200, 3000, 4000, 5000, 6000, 7000, 8000, 9000, 10,000, 11,000, 12,000, 13,000, 14,000, 15,000, 16,000, 17,000, 18,000, 19,000, and 20,000, or any range therebetween. The above-mentioned suitable viscosity range is selected so that the vinyl silicone oil has good fluidity, operability, curing speed, hardness, flexibility, strength, surface properties, bubble formation, and shape retention. Viscosities that are too low or too high will affect the above-mentioned properties. Especially when this material is used to prepare skin-friendly silicone for underwear, it is critical to choose vinyl silicone oil with appropriate viscosity. Lower viscosity helps to achieve good fluidity and bubble removal during the sizing process, while higher viscosity may help to improve the hardness and mechanical strength of the final product to meet specific support and stability requirements; at the same time, by adjusting other ingredients in the formula to ensure sufficient strength and elasticity, a product with both good flexibility and certain strength to meet the use requirements is obtained.

[0062] In some embodiments, the number average molecular weights of vinyl silicone oil I and vinyl silicone oil II are respectively 10,000 to 90,000. The viscosity of a vinyl silicone oil is closely related to its molecular weight. The higher the molecular weight, the higher the viscosity of the silicone oil; conversely, the lower the molecular weight, the lower the viscosity. When the viscosity is 200 mPa·s, the molecular weight is approximately 15,000; when the viscosity is 10,000 mPa·s, the molecular weight is approximately 60,000; and when the viscosity is 20,000 mPa·s, the molecular weight is approximately 90,000. For example, any value among 10,000, 20,000, 30,000, 40,000, 50,000, 60,000, 70,000, 80,000, or 90,000, or any range therebetween; preferably, each value is 20,000 to 80,000. The vinyl silicone oil with the above molecular weight has good fluidity, workability, curing speed, transparency, biocompatibility and surface properties; the prepared silicone has both suitable mechanical properties and ideal elasticity; the above molecular weight range provides silicone segments of appropriate length, which is conducive to providing suitable tensile strength, because the network formed by long-chain molecules after cross-linking is denser, thereby enhancing the mechanical properties of the material; while maintaining the softness and comfort of the material, it can ensure that it has sufficient strength and stability to meet the application requirements of skin-friendly products such as underwear.

[0063] In some embodiments, the vinyl content in vinyl silicone oil I and vinyl silicone oil II is 0.09 to 1.1 wt%, preferably 0.15 to 0.8 wt%. Vinyl is a key component in the cross-linking reaction of addition-type silicone. Under the action of platinum catalyst, vinyl reacts with hydrogen atoms in hydrogenated silicone oil to form Si-C bonds, thereby establishing cross-linking points between polymer chains. The higher the vinyl content, the more cross-linking points can theoretically be formed, which will lead to a higher cross-linking density. A higher cross-linking density can give the silicone higher hardness, stronger mechanical strength (such as tensile strength and tear strength), and better chemical resistance, but it may also make the material more brittle and reduce its elasticity. By regulating the vinyl content of the vinyl silicone oil to have the above content, the cross-linking density after the reaction is moderate, so that the prepared silicone has good mechanical strength while also having good softness, elasticity, and suitable adhesion.

[0064] In some embodiments, the reinforcing agent in silicone-based adhesive I and silicone-based adhesive II is white carbon black, and the content thereof is 20wt% to 40wt% respectively; preferably 25wt% to 35wt%; the remainder is vinyl silicone oil III, totaling 100%; the viscosity of vinyl silicone oil III is 4500 to 5500 mPa·s, for example 5000 mPa·s. The base polymer of the silicone-based adhesive is polydimethylsiloxane (PDMS) containing vinyl groups in the side chain, which can undergo an addition curing reaction. These vinyl groups react with hydrogen atoms in hydrogen-containing silicone oil under the action of platinum catalyst to form a cross-linked network; the preparation of the silicone-based adhesive is mainly to mix and knead the polysiloxane base polymer containing vinyl groups, white carbon black, and mixing additives; by adding white carbon black, the mechanical strength of the silicone-based adhesive can be improved, the rigidity and wear resistance of the material can be enhanced, and the softness and elasticity of the material can be maintained.

[0065] In some embodiments, the platinum catalyst is a Karstedt catalyst solution, i.e., a polyvinyl silicone oil solution of divinyltetramethyldisiloxane-platinum complex, having the structural formula: For example, the Heraeus Precious Metals K3000 model; the platinum content of the platinum catalyst is 0.1 to 0.9 wt%, such as any value selected from 0.1 wt%, 0.2 wt%, 0.3 wt%, 0.4 wt%, 0.5 wt%, 0.6 wt%, 0.7 wt%, 0.8 wt%, or 0.9 wt%, or any range therebetween; preferably, 0.2 to 0.8 wt%, i.e., 1000 to 9000 ppm. The inhibitor is at least one of vinyl cyclohexanol (CAS NO: 2554-06-5), 1-ethynylcyclohexanol (CAS NO: 78-27-3), and diallyl maleate (CAS NO: 999-21-3). The weight ratio of the platinum catalyst to the inhibitor is (10-50):1, preferably (14-45):1; the platinum content affects the reaction rate of the vinyl and hydrogen-containing silicone oil, while the inhibitor inhibits the reaction speed. When the platinum content of the catalyst and the ratio of the platinum to the inhibitor adopt the above-mentioned appropriate ratio, the addition reaction can have a suitable reaction rate, which is beneficial to improving the softness, elasticity and other properties of the silicone material.

[0066] In some embodiments, the hydrogen content of the hydrogen-containing silicone oil is 0.01wt% to 0.40wt%; for example, 0.01wt%, 0.03wt%, 0.05wt%, 0.08wt%, 0.10wt%, 0.13wt%, 0.15wt%, 0.18wt%, 0.20wt%, 0.22wt%, 0.25wt%, 0.28wt%, 0.30wt%, 0.35wt%, 0.40wt% or any range value between two of them; preferably 0.05wt% to 0.20wt%. The hydrogen atoms in hydrogen silicone oil react with the vinyl groups (-CH=CH2) in vinyl silicone oil under the action of platinum catalyst to form crosslinking points. The higher the hydrogen content, the more reactive the hydrogen silicone oil is. It can react with more vinyl groups, promote a denser crosslinking network, and the silicone product will have higher mechanical strength and stability after curing. Hydrogen silicone oil with high hydrogen content may accelerate the curing speed because more hydrogen atoms participate in the reaction and the reaction rate increases. However, too high a hydrogen content may also cause the reaction to be too fast, thereby shortening the operation time and affecting the mixing uniformity and pouring ability during the processing. Conversely, a lower hydrogen content may cause the reaction to be too fast, thus reducing the mixing uniformity and pouring ability during the processing. Hydrogen content slows the cure rate, allowing for longer processing times, but can also reduce the crosslink density and mechanical strength of the final product. High hydrogen content generally results in a harder silicone after cure, as the formation of more crosslinks creates a denser and more rigid polymer network. Low hydrogen content, on the other hand, tends to produce a softer, more elastic silicone product, which is particularly important for skin-friendly applications such as underwear, ensuring comfort and a snug fit. Higher hydrogen content and crosslink density can improve the silicone's tear resistance, as a denser network resists crack propagation. However, excessive hydrogen content can lead to brittleness and potentially reduce tear resistance. Therefore, using hydrogen-containing silicone oils with these hydrogen contents in combination with vinyl-containing raw materials can provide optimal cure speed, crosslink density, mechanical properties, and comfort, meeting the specific strength, elasticity, and softness requirements of "seamless" underwear products. By precisely controlling the hydrogen content, the silicone's overall performance can be optimized, ensuring both strength and stability, as well as softness and comfort, for underwear applications, while also avoiding yellowing after prolonged storage.

[0067] In some embodiments, component A: the weight portion of vinyl silicone oil I is 11 parts (viscosity 1000 mPa·s, vinyl content 0.32%), the weight portion of silicone base glue I is 38.25 parts (white carbon content 30 wt%), the weight portion of platinum catalyst is 0.7 parts (Karstedt catalyst solution, platinum content 3000 ppm), and the weight portion of inhibitor is 0.05 parts (vinyl ring body); component B: the weight portion of vinyl silicone oil II is 1 part (viscosity 1000 mPa·s, vinyl content 0.32%), the weight portion of silicone base glue II is 40 parts (white carbon content 30 wt%), and the weight portion of hydrogen-containing silicone oil is 9 parts (hydrogen content 0.10 wt%); the mixing ratio of component A and component B is 1:1.

[0068] In some embodiments, component A: the weight portion of vinyl silicone oil I is 10 parts (viscosity 10000 mPa·s, vinyl content 0.12%), the weight portion of silicone-based adhesive I is 39.25 parts (white carbon content 30 wt%), the weight portion of platinum catalyst is 0.7 parts (Karstedt catalyst solution, platinum content 3000 ppm), and the weight portion of inhibitor is 0.05 parts (vinyl ring body); component B: the weight portion of vinyl silicone oil II is 0 parts, the weight portion of silicone-based adhesive II is 43 parts (white carbon content 30 wt%), and the weight portion of hydrogen-containing silicone oil is 7 parts (hydrogen content 0.11 wt%); the mixing ratio of component A and component B is 1:1.

[0069] In some embodiments, component A: the weight portion of vinyl silicone oil I is 11 parts (viscosity 20,000 mPa·s, vinyl content 0.10%), the weight portion of silicone-based adhesive I is 38.25 parts (white carbon content 25 wt%), the weight portion of platinum catalyst is 0.7 parts (Karstedt catalyst solution, platinum content 3,000 ppm), and the weight portion of inhibitor is 0.05 parts (vinyl ring body); component B: the weight portion of vinyl silicone oil II is 1 part (viscosity 20,000 mPa·s, vinyl content 0.10%), the weight portion of silicone-based adhesive II is 40 parts (white carbon content 25 wt%), and the weight portion of hydrogen-containing silicone oil is 9 parts (hydrogen content 0.08 wt%); the mixing ratio of component A and component B is 1:1.

[0070] In some embodiments, component A: the weight parts of vinyl silicone oil I are 11 parts (viscosity 200 mPa·s, vinyl content 0.70%), the weight parts of silicone-based adhesive I are 38.07 parts (white carbon content 35 wt%), the weight parts of platinum catalyst are 0.9 parts (Karstedt catalyst solution, platinum content 3000 ppm), and the weight parts of inhibitor are 0.03 parts (1-ethynylcyclohexanol); component B: the weight parts of vinyl silicone oil II are 3 parts (viscosity 200 mPa·s, vinyl content 0.70%), the weight parts of silicone-based adhesive II are 39 parts (white carbon content 35 wt%), and the weight parts of hydrogen-containing silicone oil are 8 parts (hydrogen content 0.17 wt%); the mixing ratio of component A and component B is 1:1.

[0071] In some embodiments, component A: the weight portion of vinyl silicone oil I is 16 parts (viscosity 5000 mPa·s, vinyl content 0.16%), the weight portion of silicone base adhesive I is 33.08 parts (white carbon content 35 wt%), the weight portion of platinum catalyst is 0.9 parts (Karstedt catalyst solution, platinum content 3000 ppm), and the weight portion of inhibitor is 0.02 parts (diallyl maleate); component B: the weight portion of vinyl silicone oil II is 1 part (viscosity 5000 mPa·s, vinyl content 0.16%), the weight portion of silicone base adhesive II is 34 parts (white carbon content 35 wt%), and the weight portion of hydrogen-containing silicone oil is 15 parts (hydrogen content 0.05 wt%); the mixing ratio of component A and component B is 1:1.

[0072] According to the second aspect of the present application, a method for preparing the above-mentioned silica gel is provided, comprising:

[0073] Step S1: Mix the raw materials of component A according to the proportion to obtain a mixed material of component A;

[0074] Step S2: Mix the raw materials of component B according to the proportion to obtain a mixed material of component B;

[0075] Step S3: When in use, component A and component B are mixed in a weight ratio of (0.8-1.2):1 to obtain silica gel.

[0076] The raw materials are mixed at room temperature, such as 20-30° C., for example, 23° C. The preparation method is simple and can be prepared as needed. The semi-liquid silicone is obtained through cross-linking reaction between the raw materials, and after curing, it has good softness, elasticity, strength and adhesion.

[0077] According to a third aspect of the present application, there is provided the use of the above-mentioned silica gel or the silica gel prepared by the above-mentioned preparation method in seamless underwear.

[0078] In some embodiments, the underwire and / or elastic bands in seamless bras are made of silicone. This innovative silicone material, used as the bra support material, resists yellowing even under high temperatures and humidity for extended periods. It also offers excellent tactile feel, smoothness, skin-friendliness, flexibility, and sufficient strength to support the bra structure.

[0079] In some embodiments, the method for forming the steel ring and / or rubber band includes: first drawing silicone on the position of the prefabricated steel ring and / or prefabricated rubber band on the underwear fabric, then covering it with a layer of fabric to fit it, and finally hot pressing and curing it to obtain the steel ring and / or rubber band on the seamless underwear.

[0080] The present application is further described in detail below with reference to specific embodiments. These embodiments should not be construed as limiting the scope of protection claimed in this application.

[0081] The raw materials used in the examples of this application are all prior art and can be purchased commercially;

[0082] Example 1

[0083] A silica gel, the total raw materials of which are composed of component A and component B; calculated by weight percentage:

[0084] Component A: vinyl silicone oil I 11%, silicone-based adhesive I 38.25%, platinum catalyst 0.7%, inhibitor 0.05%, total 50%; see Table 1-A;

[0085] Component B: vinyl silicone oil II 1%, silicone base adhesive II 40%, hydrogenated silicone oil 9%, total 50%; see Table 1-B;

[0086] According to the formula of component A, each raw material is added into the reactor according to the proportion, stirred evenly, and vacuumed to degas to obtain component A; according to the formula of component B, each raw material is added into the reactor according to the proportion, stirred evenly at 23°C, and vacuumed to degas to obtain component B; when used, component A and component B are mixed in a ratio of 1:1 to obtain semi-liquid silica gel.

[0087] After the semi-liquid silicone was cured into silicone strips, its flexibility and oxidation resistance were tested. The test results are shown in Table 21.

[0088] Example 2

[0089] The difference between Example 2 and Example 1 is that the formula of component A is shown in Table 2-A and the formula of component B is shown in Table 2-B, and the performance test results of the silicone strip are shown in Table 21.

[0090] Example 3

[0091] The difference between Example 3 and Example 1 is that the formula of component A is shown in Table 3-A and the formula of component B is shown in Table 3-B, and the performance test results of the silicone strip are shown in Table 21.

[0092] Example 4

[0093] The difference between Example 4 and Example 1 is that the formula of component A is shown in Table 4-A and the formula of component B is shown in Table 4-B, and the performance test results of the silicone strip are shown in Table 21.

[0094] Example 5

[0095] The difference between Example 5 and Example 1 is that the formula of component A is shown in Table 5-A and the formula of component B is shown in Table 5-B, and the performance test results of the silicone strip are shown in Table 21.

[0096] Example 6

[0097] The difference between Example 6 and Example 1 is that the formula of component A is shown in Table 6-A and the formula of component B is shown in Table 6-B; the performance test results of the silicone strips are shown in Table 21.

[0098] Example 7

[0099] The difference between Example 7 and Example 1 is that the formula of component A is shown in Table 7-A and the formula of component B is shown in Table 7-B; the performance test results of the silicone strips are shown in Table 21.

[0100] Example 8

[0101] The difference between Example 8 and Example 1 is that the formula of component A is shown in Table 8-A and the formula of component B is shown in Table 8-B; the performance test results of the silicone strips are shown in Table 21.

[0102] Example 9

[0103] The difference between Example 9 and Example 1 is that the formula of component A is shown in Table 9-A and the formula of component B is shown in Table 9-B; the performance test results of the silicone strips are shown in Table 21.

[0104] Example 10

[0105] The difference between Example 10 and Example 1 is that the formula of component A is shown in Table 10-A and the formula of component B is shown in Table 10-B, and the performance test results of the silicone strip are shown in Table 21.

[0106] Example 11

[0107] The difference between Example 11 and Example 1 is that the viscosity and vinyl content of the vinyl silicone oil are different; see Table 11-A and Table 11-B for details; the performance test results of the silicone strips are shown in Table 21.

[0108] Example 12

[0109] The difference between Example 12 and Example 1 is that the viscosity and vinyl content of the vinyl silicone oil are different; see Table 12-A and Table 12-B for details; the performance test results of the silicone strips are shown in Table 21.

[0110] Example 13

[0111] The difference between Example 13 and Example 1 is that the viscosity and vinyl content of the vinyl silicone oil are different; see Table 13-A and Table 13-B for details; the performance test results of the silicone strips are shown in Table 21.

[0112] Example 14

[0113] The difference between Example 14 and Example 1 is that the hydrogen content of the hydrogenated silicone oil is different; see Table 14-A and Table 14-B for details; the performance test results of the silicone strips are shown in Table 21.

[0114] Example 15

[0115] The difference between Example 15 and Example 1 is that the hydrogen content of the hydrogenated silicone oil is different; see Table 15-A and Table 15-B for details; the performance test results of the silicone strips are shown in Table 21.

[0116] Example 16

[0117] The difference between Example 16 and Example 1 is that the hydrogen content of the hydrogenated silicone oil is different; see Table 16-A and Table 16-B for details; the performance test results of the silicone strips are shown in Table 21.

[0118] Example 17

[0119] The difference between Example 17 and Example 1 is that the silica content of the silicone-based adhesive is different; see Table 17-A and Table 17-B for details; the performance test results of the silicone strips are shown in Table 21.

[0120] Example 18

[0121] The difference between Example 18 and Example 1 is that the silica content of the silicone-based adhesive is different; see Table 18-A and Table 18-B for details; the performance test results of the silicone strips are shown in Table 21.

[0122] Comparative Example 1

[0123] The commercially available PUR jelly glue is manufactured by Dongguan Yiming New Materials Co., Ltd., and its brand and name are "PUR3016 high-temperature hot melt glue".

[0124] Comparative Example 2

[0125] The difference between Comparative Example 2 and Example 1 is that the component formulas are different;

[0126] By weight, component A: 3 parts vinyl silicone oil I, 25 parts silicone base adhesive I, 0.2 parts platinum catalyst, 0.01 parts inhibitor; component B: 0 parts vinyl silicone oil II, 25 parts silicone base adhesive II, 3 parts hydrogenated silicone oil. See Tables 19-A and 19-B for details. Silicone strip performance test results are shown in Table 21.

[0127] Comparative Example 3

[0128] The difference between Comparative Example 3 and Example 1 is that the component formulas are different;

[0129] By weight, component A: 20 parts vinyl silicone oil I, 50 parts silicone base adhesive I, 1.5 parts platinum catalyst, 0.2 parts inhibitor; component B: 5 parts vinyl silicone oil II, 50 parts silicone base adhesive II, 25 parts hydrogenated silicone oil. See Table 20-A and Table 20-B for details. Test results of the silicone strip properties are shown in Table 21.

[0130] Application Examples

[0131] A seamless underwear, wherein the semi-liquid silicone prepared in Examples 1 to 18 is drawn on the position of the prefabricated steel ring and rubber band on the underwear fabric by a machine, then covered with a layer of fabric for lamination, and finally heat-pressed and cured, to obtain an underwear body 1 on which a flexible silicone steel ring 2 and a silicone rubber band 3 are fixed; its physical structure is as follows Figure 1 As shown; similarly, the silicone rubber of Comparative Examples 1 to 3 was used as the underwire and rubber band materials. The above-mentioned underwear was tested for wearing comfort and functionality. The underwear made with the silicone rubber of Examples 1 to 18 all had good user experience. The silicone underwire and rubber band felt smooth, soft, and skin-friendly, while also having appropriate strength and good shaping effect on the underwear body. However, the underwear made with the silicone rubber of Comparative Examples 1 to 3 had poor comfort.

[0132] Table 1-AA glue

[0133]

[0134] Table 1-BB glue

[0135]

[0136] Table 2-AA glue

[0137]

[0138]

[0139] Table 2-BB glue

[0140]

[0141] Table 3-AA glue

[0142]

[0143] Table 3-BB glue

[0144]

[0145] Table 4-AA glue

[0146]

[0147]

[0148] Table 4-BB glue

[0149]

[0150] Table 5-AA glue

[0151]

[0152] Table 5-BB glue

[0153]

[0154] Table 6-AA glue

[0155]

[0156] Table 6-BB glue

[0157]

[0158] Table 7-AA glue

[0159]

[0160] Table 7-BB glue

[0161]

[0162] Table 8-AA glue

[0163]

[0164] Table 8-BB glue

[0165]

[0166]

[0167] Table 9-AA glue

[0168]

[0169] Table 9-BB glue

[0170]

[0171] Table 10-AA glue

[0172]

[0173] Table 10-BB glue

[0174]

[0175] Table 11-AA glue

[0176]

[0177] Table 11-BB glue

[0178]

[0179] Table 12-AA glue

[0180]

[0181] Table 12-BB glue

[0182]

[0183] Table 13-AA glue

[0184]

[0185]

[0186] Table 13-BB glue

[0187]

[0188] Table 14-AA glue

[0189]

[0190] Table 14-BB glue

[0191]

[0192] Table 15-AA glue

[0193]

[0194] Table 15-BB glue

[0195]

[0196] Table 16-AA glue

[0197]

[0198] Table 16-BB glue

[0199]

[0200] Table 17-AA glue

[0201]

[0202] Table 17-BB glue

[0203]

[0204]

[0205] Table 18-AA glue

[0206]

[0207] Table 18-BB glue

[0208]

[0209] Table 19-AA glue

[0210]

[0211] Table 19-BB glue

[0212]

[0213] Table 20-AA glue

[0214]

[0215]

[0216] Table 20-BB glue

[0217]

[0218] The silica gels of Examples 1 to 18, the PUR jelly glue of Comparative Example 1, and the silica gels of Comparative Examples 1 to 2 were subjected to basic performance tests such as Shore hardness, tensile strength, elongation, and tear strength, as well as high temperature and high humidity (85°C and 85% humidity) aging performance tests; the test data are shown in Table 21 below.

[0219] Table 21

[0220]

[0221] The test data in Table 21 show that the silica gel prepared in Examples 1 to 18 of the present application has a tensile strength, elongation, and tear strength similar to that of the conventional PUR jelly glue in Comparative Example 1, and can also meet the use requirements, especially better softness. For example, the elongation reaches 700-900%, with most concentrated around 750%, and the tear strength reaches 20.0-40.0 MPa. It does not turn yellow after aging for 1000 hours under high temperature and high humidity conditions. The PUR jelly glue in Comparative Example 1 is obviously yellow, and its softness and elasticity are worse than those of the present application examples. The underwear steel rings and rubber bands prepared with PUR have high hardness, poor skin affinity, and poor elasticity. After long-term wear, they easily rub the skin, crack, and turn yellow, greatly reducing comfort. The component ratios of Comparative Examples 2 and 3 are not properly formulated. The silica gel prepared in Examples 1 to 18 has higher tensile strength, elongation, and tear strength than those of Comparative Examples 2 and 3, lower hardness, and better softness.

[0222] It should be noted that the terms "first," "second," and the like in the specification and claims of this application are used to distinguish similar objects, and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of the application described herein can, for example, be implemented in an order other than that described herein.

[0223] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A silica gel, characterized in that The silica gel comprises component A and component B; In parts by weight, the component A comprises the following raw materials: 6 to 17 parts of vinyl silicone oil I, 30 to 45 parts of silicone-based adhesive I, 0.4 to 1.0 parts of platinum catalyst, and 0.02 to 0.10 parts of inhibitor; In parts by weight, the component B comprises the following raw materials: 0 to 3 parts of vinyl silicone oil II, 30 to 45 parts of silicone-based adhesive II, and 5 to 20 parts of hydrogenated silicone oil.

2. The silica gel according to claim 1, characterized in that The weight portion of the vinyl silicone oil I is 8 to 16 parts, the weight portion of the silicone-based adhesive I is 33 to 40 parts, the weight portion of the platinum catalyst is 0.5 to 0.9 parts, and the weight portion of the inhibitor is 0.03 to 0.08 parts; and / or, the weight portion of the vinyl silicone oil II is 1 to 3 parts, the weight portion of the silicone-based adhesive II is 32 to 43 parts, and the weight portion of the hydrogenated silicone oil is 7 to 18 parts; And / or, the weight ratio of the component A to the component B is (0.8-1.2):

1.

3. The silica gel according to claim 1 or 2, characterized in that The weight portion of the vinyl silicone oil I is 10 to 16 parts, the weight portion of the silicone-based adhesive I is 35 to 39 parts, the weight portion of the platinum catalyst is 0.6 to 0.9 parts, and the weight portion of the inhibitor is 0.03 to 0.06 parts; and / or, the weight portion of the vinyl silicone oil II is 1 to 2 parts, the weight portion of the silicone-based adhesive II is 34 to 43 parts, and the weight portion of the hydrogenated silicone oil is 8 to 16 parts; And / or, the weight ratio of the component A to the component B is (0.9-1.1):

1.

4. The silica gel according to any one of claims 1 to 3, characterized in that The weight ratio of the vinyl silicone oil I to the hydrogenated silicone oil is (0.5-2.3):1; and / or, the weight ratio of the vinyl silicone oil II to the hydrogen-containing silicone oil is (0.05-0.45):1; and / or, the weight ratio of the total amount of the vinyl silicone oil I and the vinyl silicone oil II to the hydrogen-containing silicone oil is (1.0-2.0):1; And / or, the weight ratio of the silicone-based adhesive I to the hydrogenated silicone oil is (1.6-5.8):1; And / or, the weight ratio of the silicone base glue II to the hydrogen-containing silicone oil is (1.7-6.2):1; and / or, the weight ratio of the total amount of the silicone base adhesive I and the silicone base adhesive II to the hydrogenated silicone oil is (3.0-12.0):1; And / or, the weight ratio of the platinum catalyst to the inhibitor is (10-50):

1.

5. The silica gel according to any one of claims 1 to 4, characterized in that The viscosity of the vinyl silicone oil I and the vinyl silicone oil II is 200 to 20,000 mPa·s, respectively; preferably 500 to 15,000 mPa·s; and / or, the number average molecular weights of the vinyl silicone oil I and the vinyl silicone oil II are respectively 10,000 to 90,000; preferably 20,000 to 80,000; And / or, the vinyl content in the vinyl silicone oil I and the vinyl silicone oil II is 0.09 to 1.1 wt % respectively; preferably 0.15 wt % to 0.8 wt % respectively.

6. The silica gel according to any one of claims 1 to 5, characterized in that The silica content in the silicone-based adhesive I and the silicone-based adhesive II is 20 wt% to 40 wt% respectively, preferably 25 wt% to 35 wt%; the remainder is vinyl silicone oil III, totaling 100%; the viscosity of the vinyl silicone oil III is 4500 to 5500 mPa·s; And / or, the platinum catalyst is a polyvinyl silicone oil solution of divinyltetramethyldisiloxane-platinum complex; And / or, the platinum content in the platinum catalyst is 0.1-0.9 wt%, preferably 0.2 wt%-0.8 wt%.

7. The silica gel according to any one of claims 1 to 6, characterized in that The hydrogen content of the hydrogen-containing silicone oil is 0.01wt% to 0.40wt%; preferably 0.05wt% to 0.20wt%; And / or, the inhibitor is at least one of a vinyl ring, 1-ethynylcyclohexanol and diallyl maleate.

8. A method for preparing the silica gel according to any one of claims 1 to 7, characterized in that: The method comprises: Step S1: Mix the raw materials according to the proportions of the raw materials in component A to obtain a component A mixture; Step S2: mixing the raw materials according to the proportions of the raw materials in component B to obtain a component B mixture; Step S3: When in use, the component A mixture and the component B mixture are mixed in a weight ratio of (0.8-1.2):1 to obtain the silica gel.

9. Use of the silica gel according to any one of claims 1 to 7 or the silica gel prepared by the preparation method according to claim 8 in seamless underwear.

10. The application according to claim 9, characterized in that: The material of the steel ring and / or rubber band on the seamless underwear is the silicone; Preferably, the molding method of the steel ring and / or the rubber band includes: first drawing the silicone on the position of the prefabricated steel ring and / or prefabricated rubber band on the underwear fabric, then covering it with a layer of fabric, and finally hot pressing and curing it to obtain the steel ring and / or the rubber band on the seamless underwear.

Images