Preparation method of multi-element ice-repellent firefighting clothing fabric and firefighting clothing fabric

Abstract

The present application provides a preparation method of a multi-element ice-repellent firefighting suit fabric and a firefighting suit fabric, the preparation method comprising the following steps: mixing, stirring and dispersing a first aqueous polyurethane liquid, SiC powder and graphite powder to obtain a melting-promoting functional coating liquid; coating the melting-promoting functional coating liquid on a first surface of a base fabric to obtain a melting-promoting coating base fabric; pasting a plurality of adhesive tapes at intervals on a second surface of the melting-promoting coating base fabric to obtain a fabric-tape combination base fabric; dispersing nano-SiO2 particles in ethyl acetate to obtain a mixed solution, mixing the mixed solution with a second aqueous polyurethane liquid to obtain a dispersion; spraying the dispersion on the second surface to obtain a spray-coated base fabric; padding the spray-coated base fabric after removing the adhesive tape to obtain a padded base fabric; soaking the padded base fabric in silicone oil for a period of time and then taking it out to obtain a multi-element ice-repellent firefighting suit fabric, wherein the prepared firefighting suit fabric has good ice-repellent performance.

Description

Technical Field

[0001] The present application relates to the technical field of protective textiles, and in particular to a method for preparing a multi-element ice-repellent firefighting clothing fabric and a firefighting clothing fabric. Background Art

[0002] Fire suits are one of the important equipment to protect the personal safety of firefighters active on the front line of firefighting. They are not only indispensable items at the fire rescue scene, but also fire-fighting tools to protect firefighters from physical harm. From the perspective of protection, they must be fire-resistant, heat-resistant and heat-insulating, and also strong and tough to prevent impacts and collisions from sharp objects.

[0003] Currently, research on firefighting uniform fabrics has mostly focused on their fire resistance, heat resistance, thermal insulation, and breathability, with relatively little research on their ice-repellent properties. Firefighters may work in cold, humid environments for extended periods of time. If the fabrics used for firefighting uniforms have poor ice-repellent properties, significant amounts of ice could form on the uniforms, impacting their work efficiency and health.

[0004] Therefore, how to prepare firefighting clothing fabrics with good ice-repellent properties is an urgent problem to be solved. Summary of the Invention

[0005] In view of this, the purpose of this application is to provide a preparation method of a multi-element ice-repellent firefighting clothing fabric and a firefighting clothing fabric.

[0006] Based on the above objectives, the first aspect of the present application provides a method for preparing a multi-element ice-repellent firefighting uniform fabric, comprising the following steps:

[0007] The first aqueous polyurethane liquid, SiC powder and graphite powder are mixed, stirred, added with additives, and dispersed until the viscosity of the mixed liquid reaches a preset viscosity, then the dispersion is stopped, and the melting-promoting functional coating liquid is obtained after defoaming;

[0008] Applying the melt-promoting functional coating liquid on the first surface of the base fabric and drying it to obtain a melt-promoting coated base fabric;

[0009] affixing a plurality of adhesive tapes at intervals on the second surface of the melt-promoting coated base fabric to obtain a fabric-tape combination base fabric, wherein the second surface is the surface of the melt-promoting coated base fabric away from the first surface;

[0010] dispersing nano-SiO2 particles in ethyl acetate to obtain a mixed solution, and mixing the mixed solution with a second aqueous polyurethane solution to obtain a dispersion;

[0011] spraying the dispersion onto the second surface and drying to obtain a spray-coated base fabric;

[0012] removing the adhesive tape from the spray-coated base fabric, and then padding the spray-coated base fabric after the adhesive tape is removed, and drying the padding base fabric to obtain the padding base fabric;

[0013] The padded base fabric is immersed in silicone oil, taken out after a period of time, the silicone oil on the surface of the padded base fabric is wiped off, and the padded base fabric is dried to obtain a multi-element ice-repellent firefighting suit fabric.

[0014] Optionally, the preset viscosity is 23000-25000 mPa·s.

[0015] Optionally, the weight ratio of the first aqueous polyurethane liquid, SiC powder and graphite powder is 18-22:0.8-1.2:4-6.

[0016] Optionally, the auxiliary agent is a mixed solution of a dispersant, a defoaming agent and a thickener.

[0017] Optionally, the weight ratio of the aqueous polyurethane, dispersant, defoamer and thickener is 50:0.1:0.1:0.3.

[0018] Optionally, the base fabric is an aramid IIIA fabric base fabric, and the coating thickness of the melting-promoting functional coating liquid is 0.1-0.2 mm.

[0019] Optionally, the weight ratio of the nano-SiO2 particles, ethyl acetate and the second aqueous polyurethane liquid is 0.8-1.2:8-12:8-12.

[0020] Optionally, the impregnation liquid in the padding operation is a mixture of a waterproof and oil-proof agent and water.

[0021] Optionally, the padding base fabric is soaked in silicone oil for 3 to 6 hours and then taken out.

[0022] The second aspect of the present application provides a multi-element ice-repellent firefighting clothing fabric, which is prepared by the preparation method described in any one of the first aspects above.

[0023] From the above, it can be seen that the preparation method of the multi-element ice-repellent firefighting clothing fabric and the firefighting clothing fabric provided in this application improve the ice-repellent performance of the prepared firefighting clothing fabric from many aspects during the preparation process. First, by adding SiC powder and graphite powder during the preparation process, the ice-removing performance and smoothness of the prepared firefighting clothing fabric can be improved, thereby improving its ice-repellent performance. Then, by spraying the dispersion on the second surface of the fabric-tape combination base fabric, the hydrophobicity of the firefighting clothing fabric can be improved without affecting the breathability of the base fabric, thereby improving its ice-repellent performance. Finally, by immersing the impregnated base fabric in silicone oil, the firefighting clothing fabric forms an oil-soaked porous smooth surface, further improving its ice-repellent performance, so that the prepared firefighting clothing fabric has good ice-repellent performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in this application or related technologies, the following briefly introduces the drawings required for use in the embodiments or related technical descriptions. Obviously, the drawings described below are merely embodiments of this application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0025] Figure 1 Schematic diagram of a process for preparing a multi-element ice-repellent firefighting uniform fabric (also referred to as an oil-infiltrated / hydrophobic / melt-promoting multi-element ice-repellent firefighting uniform fabric) according to an embodiment of the present application;

[0026] Figure 2 This is a schematic diagram of the second surface of the fabric-tape combination base fabric according to an embodiment of the present application. DETAILED DESCRIPTION

[0027] In order to make the objectives, technical solutions and advantages of the present disclosure more clear, the present disclosure is further described in detail below with reference to specific embodiments.

[0028] It should be noted that, unless otherwise defined, the technical terms used in the following examples have the same meanings as commonly understood by those skilled in the art to which this invention belongs. The experimental reagents used in the following examples, unless otherwise specified, are all conventional biochemical reagents; the experimental methods described, unless otherwise specified, are all conventional methods.

[0029] The main duties of firefighters include extinguishing fires, rescuing disasters, inspecting fire safety facilities and promoting fire safety knowledge. They also participate in rescue work (such as road rescue and ambulance rescue) and serving the public (such as clearing wild animals and eliminating safety hazards).

[0030] Firefighter uniforms are a crucial piece of equipment for protecting firefighters on the front lines. They are not only essential at fire scenes but also serve as firefighting tools, protecting them from injury. Currently, research on firefighter uniform fabrics has largely focused on their fire resistance, heat resistance, thermal insulation, and breathability, with limited research on their ice-repellent properties. Firefighters may work in cold, humid environments for extended periods. If the fabrics used for firefighter uniforms have poor ice-repellent properties, significant amounts of ice may form on the uniforms, impacting their work efficiency and health.

[0031] For the above purpose, see Figure 1 In a first aspect, the present application provides a method for preparing a multi-element ice-repellent firefighting clothing fabric, comprising the following steps:

[0032] Step S1, mixing a first aqueous polyurethane liquid, SiC powder, and graphite powder, stirring, adding an additive, and dispersing until the viscosity of the mixed liquid reaches a preset viscosity, stopping the dispersion, and defoaming to obtain a melting-promoting functional coating liquid;

[0033] Step S2, coating the melt-promoting functional coating liquid on the first surface of the base fabric, and drying to obtain a melt-promoting coated base fabric;

[0034] Step S3, pasting a plurality of adhesive tapes at intervals on the second surface of the melt-promoting coated base fabric to obtain a fabric-tape combination base fabric, wherein the second surface is the surface of the melt-promoting coated base fabric away from the first surface;

[0035] Step S4, dispersing the nano-SiO2 particles in ethyl acetate to obtain a mixed solution, and mixing the mixed solution with a second aqueous polyurethane liquid to obtain a dispersion;

[0036] Step S5, spraying the dispersion onto the second surface and drying to obtain a spray-coated base fabric;

[0037] Step S6, removing the adhesive tape from the spray-coated base fabric, and then padding the spray-coated base fabric after the adhesive tape is removed, and drying to obtain a padded base fabric;

[0038] Step S7: soak the padded base fabric in silicone oil, take it out after a period of time, wipe off the silicone oil on the surface of the padded base fabric, and dry it to obtain a multi-element ice-repellent firefighting suit fabric.

[0039] Specifically, there are two main factors that contribute to ice formation on fabric surfaces: contact with water / water vapor; and a temperature below the freezing point of water. When water / water vapor freezes on a fabric surface, the main factors influencing ice adhesion are the electrostatic attraction between the fabric and the ice, the van der Waals force between fabric molecules and the ice, and the mechanical force between the fabric and the ice due to a "mechanical interlocking" effect. When removing ice from a fabric surface, from a purely mechanical perspective, the electrostatic attraction and van der Waals force between the ice and the fabric are very small. These forces only exert significant effects in the absence of mechanical forces. Once mechanical forces are present, they are significantly greater than the electrostatic and van der Waals forces, making them the primary source of adhesion. Smoothness theory posits that when water freezes on a surface with low roughness, the mechanical forces between the ice and the surface are relatively small, making ice removal easiest. Reducing surface roughness can enhance the deicing properties of a material.

[0040] Therefore, in this application, adding the first aqueous polyurethane liquid during the preparation process in step S1 can improve the surface smoothness of the firefighting suit fabric, thereby reducing its surface roughness and enhancing the firefighting suit fabric's de-icing properties. Furthermore, because graphite powder has excellent lubricity, adding graphite powder can improve the smoothness of the firefighting suit fabric's surface, reduce its surface roughness, and thus enhance the firefighting suit fabric's ice-repelling properties.

[0041] At the same time, in this application, the ice repellency of the fire suit fabric is improved by adding SiC powder and graphite powder during the preparation process in step S1. This is because SiC powder and graphite powder have good thermal conductivity, which can increase the thermal conductivity of the fire suit fabric. Graphite powder also has good electrical conductivity and can increase the dielectric constant of the fire suit fabric. As a result, the prepared fire suit fabric can absorb more heat from the environment in the same time, promote the melting of ice on its surface, and improve the deicing and ice repellency of the fire suit fabric.

[0042] In addition to being hydrophobic, ice-repellent materials must also be easily de-icable. De-icing easily means that, using the same de-icing methods, the de-icing process on the surface of an ice-repellent material is faster and easier than on standard materials. Thermal de-icing is one of the most widely used de-icing methods in the material de-icing field. Its principle is to raise the ambient temperature of the ice above its melting point, causing it to melt and then fall off the surface.

[0043] If a material has the property of promoting the melting of surface ice (i.e., melting-promoting properties), its deicing performance will be significantly improved. The better the dielectric properties of a material, the greater its molecular polarizability. The greater the molecular polarizability of a material, the stronger the van der Waals force between the material and the ice on its surface, making it easier for an ice-water mixed layer to form between the material and the ice on its surface, which is beneficial to the melting of the ice on its surface. Therefore, improving the dielectric properties of a material is conducive to the melting of the ice on its surface.

[0044] However, most fabric materials are non-conductors, and their thermal conductivity is generally very low at room temperature, such as aramid fabric (0.2 (W / m·K)) and cotton fabric (0.05 (W / m·K)). The thermal conductivity of fabric is mainly affected by phonon scattering and cannot be changed at room temperature.

[0045] Therefore, in the present application, a melting-promoting functional coating liquid with high thermal conductivity and dielectric constant is prepared through step S1, and the melting-promoting functional coating liquid is coated on the first surface of the base fabric in step S2. By loading the melting-promoting functional coating liquid with high thermal conductivity and dielectric constant on the surface of the base fabric, the thermal conductivity and dielectric constant of the fire-fighting suit fabric are improved, so that it can absorb more heat from the environment in the same time, thereby promoting the melting of ice on its surface and improving its de-icing performance and ice-repelling performance.

[0046] Hydrophobicity theory posits that fabrics with high hydrophobicity are less likely to retain water and moisture than fabrics with poor hydrophobicity. When the ambient temperature is below freezing, improving a fabric's hydrophobicity can reduce the amount of ice that forms on its surface and delay its onset. The initial inspiration for hydrophobic surfaces stemmed from the "lotus effect." In the 1990s, German botanist Barthlott et al. at the University of Bonn uncovered the "lotus leaf structure," discovering that the lotus leaf's self-cleaning properties stem from its surface microstructure. The lotus leaf's surface features micron-scale papillae, which are covered with nanoscale wax crystals. This micro-nanoscale roughness significantly increases the contact angle of water droplets, making them roll off easily. Therefore, in the research of hydrophobic materials, constructing hydrophobic surfaces with a "lotus leaf structure" is crucial. As water droplets roll off the surface, they carry away contaminants, keeping the surface clean and imparting multiple properties to hydrophobic materials, including water repellency, corrosion resistance, ice resistance, and anti-adhesion. Therefore, in the present application, a dispersion containing nano-SiO2 particles is prepared through step S4, and the dispersion is sprayed on the second surface through step S5, and the nano-SiO2 particles are used to form a micro-nano hybrid structure on the second surface to construct a "lotus leaf structure" to increase the hydrophobic properties of the firefighting suit fabric, thereby improving the ice-repellent performance of the firefighting suit fabric.

[0047] In the present application, before spraying the dispersion, multiple tapes are pasted at intervals on the second surface of the melting-promoting coating base cloth, and then the dispersion is sprayed. The tape is removed after spraying, so that the area of ​​the sprayed base cloth where the tape is not pasted is sprayed with a layer of dispersion, which improves the hydrophobicity of the entire fire-fighting suit fabric. At the same time, the area where the tape is pasted is not sprayed with dispersion, so that this part of the area retains the original breathability of the base cloth, so that the fire-fighting suit fabric prepared by the present application has good hydrophobicity, thereby improving its ice-repellent performance, while maintaining good breathability.

[0048] Among them, step S6 is to perform a padding operation on the spray-coated base fabric after the tape is removed, which can further improve the hydrophobicity of the firefighting suit fabric and thus improve its ice-repellent performance.

[0049] In step S7, the padded base fabric is immersed in silicone oil for a period of time and then removed. This utilizes the principle that oil droplets prevent ice crystal formation, forming an oil-infused porous smooth surface (SLIPS) on the firefighting uniform fabric, effectively improving its ice-repellent properties. The oil-infused porous smooth surface is a special pitcher plant-like surface with a microscopic roughness and special hydrophilic substances. It is also covered with a thin, lubricating oil film, which makes it easy for ice crystals to slide off the oil-infused surface. After water covers the oil-infused fabric surface, it spreads on the surface. Under the influence of factors such as gravity and capillary action, the spread water layer is segmented into several small liquid areas on the fabric surface. As the water freezes, ice crystals will continue to form on the water surface in these small liquid areas. Since the density of silicone oil is slightly smaller than that of water, the silicone oil molecules on the surface of the oil-soaked fabric will continue to migrate above the water in the small liquid areas and eventually wrap the ice crystals. This wrapping effect will hinder the freezing process of water, delay the time for water to form ice on the surface of the oil-soaked fabric, and improve the ice-repellent performance of the fabric.

[0050] Specifically, in step S1, water-based polyurethane, SiC powder and graphite powder are mixed and dispersed using a disperser, during which additives are added. During the stirring process, an infrared thermometer is used to monitor the temperature of the dispersion in real time. When the temperature reaches 30°C, a digital viscometer is used to test the viscosity of the dispersion. When the viscosity of the dispersion reaches a preset viscosity, the dispersion is stopped to obtain the melting-promoting functional coating liquid.

[0051] The preset viscosity is 23,000 to 25,000 mPa·s. When the viscosity of the melting-promoting functional coating liquid is within this range, it can be well coated on the first surface of the base fabric, and the coating effect is good.

[0052] In this application, the first aqueous polyurethane liquid and the second aqueous polyurethane liquid are both aqueous polyurethanes, and are only used to distinguish the aqueous polyurethanes used in S1 and S4. Therefore, the aqueous polyurethane used in step S1 is called the first aqueous polyurethane liquid, and the aqueous polyurethane used in step S2 is called the second aqueous polyurethane liquid.

[0053] In some embodiments, the weight ratio of the first aqueous polyurethane liquid, SiC powder, and graphite powder is 18-22:0.8-1.2:4-6.

[0054] Specifically, when the weight ratio of the first aqueous polyurethane liquid, SiC powder, and graphite powder is within this range, the addition amounts of the first aqueous polyurethane liquid, SiC powder, and graphite powder are all appropriate, ensuring a smooth surface with low roughness for the firefighting suit fabric while effectively improving the thermal conductivity and dielectric properties of the firefighting suit fabric, enhancing its ice-repellent properties. Furthermore, the weight ratio of the first aqueous polyurethane liquid, SiC powder, and graphite powder can be 18:0.8:4, 20:1:3, 22:1.2:6, and so on.

[0055] When the amount of the first aqueous polyurethane liquid added is too much, the surface smoothness of the prepared fire-fighting suit fabric will decrease and the surface roughness will increase, thereby weakening the de-icing performance of the fire-fighting suit fabric; when the amount of the first aqueous polyurethane liquid added is too little, the viscosity of the melting-promoting functional coating liquid will be reduced, making it difficult to coat on the base fabric, which is not conducive to the preparation process.

[0056] When too much SiC powder is added, the SiC particles will be unevenly dispersed; when too little SiC powder is added, the thermal conductivity of the fire suit fabric will be insufficient, affecting its ice-repellent performance.

[0057] When too much graphite powder is added, it will cause graphite particles to agglomerate; when too little graphite powder is added, it will cause the dielectric constant of the fire suit fabric to be insufficient, affecting its ice-repellent performance.

[0058] In some embodiments, the auxiliary agent is a mixed solution of a dispersant, a defoamer, and a thickener, and the weight ratio of the aqueous polyurethane, the dispersant, the defoamer, and the thickener is 50:0.1:0.1:0.3.

[0059] Specifically, the addition of the dispersant, defoamer and thickener can improve the dispersion of SiC powder and graphite powder in the first aqueous polyurethane liquid, while also increasing the viscosity of the melting-promoting functional coating liquid and defoaming it as quickly as possible.

[0060] The dispersant, defoamer and thickener can be selected from the commonly used dispersants, defoamers and thickeners in the industry. For example, the dispersant can be the RD-9786 aqueous dispersant of Qingdao Shengshi New Materials Co., Ltd., the defoamer can be the DU-631 or H-630 defoamer of Jiangxi Haiduo Chemical Co., Ltd., and the thickener can be the CO-1134 thickener of Dongguan Nanhui New Materials Co., Ltd.

[0061] In some embodiments, the defoaming step can be: placing the melting-promoting functional coating liquid into a vacuum drying oven and an ultrasonic cleaning machine for defoaming in turn, wherein the vacuum defoaming times are 3 times and the ultrasonic defoaming times are 3 times, each time for 10 minutes, to remove bubbles in the melting-promoting functional coating liquid.

[0062] In some embodiments, in step S2, the melt-promoting functional coating liquid is coated on the surface of the base fabric by a blade coating method, dried at room temperature for half an hour, initially solidified, and then dried in a blast oven at 60°C for half an hour, taken out, and the melt-promoting coating base fabric is obtained.

[0063] Specifically, first air dry at room temperature for initial curing, then bake at 60°C. This gradual drying method can alleviate cracking caused by sudden temperature increases, helping to achieve a better quality coating. Do not dry directly at temperatures above room temperature, as this may cause the coating to dry too quickly, resulting in cracking and affecting coating quality.

[0064] In some embodiments, the base fabric is an aramid IIIA fabric base fabric, and the coating thickness of the melting-promoting functional coating liquid is 0.1-0.2 mm.

[0065] Specifically, when the coating thickness of the melting-promoting functional coating liquid is 0.1-0.2mm, the coating thickness is moderate, which neither excessively increases the thickness of the firefighting suit fabric nor increases its ice repellency. If the coating thickness of the melting-promoting functional coating liquid is too thin, the coating adhesion is poor, affecting the performance of the resulting firefighting suit fabric. If the coating thickness of the melting-promoting functional coating liquid is too thick, the thickness and weight of the resulting firefighting suit fabric increase significantly, affecting the practical experience.

[0066] In some embodiments, the weight ratio of the nano-SiO2 particles, ethyl acetate and the second aqueous polyurethane liquid is 0.8-1.2:8-12:8-12.

[0067] Specifically, when the weight ratio of the nano-SiO2 particles, ethyl acetate, and the second aqueous polyurethane liquid is within this range, the addition amounts of the nano-SiO2 particles, ethyl acetate, and the second aqueous polyurethane liquid are moderate, ensuring that the SiO2 particles are completely and evenly dispersed, thereby improving the hydrophobic properties of the prepared firefighting uniform fabric and, in turn, its ice repellency. The weight ratio of the nano-SiO2 particles, ethyl acetate, and the second aqueous polyurethane liquid can be 0.8:8:8, 1.0:10:10, 1.2:12:12, etc.

[0068] When too many SiO2 particles are added, the SiO2 particles will agglomerate and the dispersion will be uneven; when too few SiO2 particles are added, the hydrophobic effect of the firefighting suit fabric will be reduced, thereby affecting its hydrophobicity and ice repellency.

[0069] When too much ethyl acetate is added, it will affect the solid content of the melting-promoting functional coating liquid, resulting in poor coating effect of the melting-promoting functional coating liquid; when too little ethyl acetate is added, it will affect the dispersion degree of SiO2 particles, resulting in poor dispersion of SiO2 particles.

[0070] When too much of the second aqueous polyurethane liquid is added, the function of the SiO2 particles will be affected, so that they cannot effectively improve the hydrophobic effect of the fabric; when too little of the second aqueous polyurethane liquid is added, the adhesion between the SiO2 particles and the fabric will be affected, so that the dispersion cannot be sprayed evenly and stably on the second surface.

[0071] In some embodiments, the impregnation liquid in the padding operation is a mixture of a water- and oil-repellent agent and water.

[0072] Specifically, the padding step may be:

[0073] ① Mix the waterproof and oil-proof agent with distilled water in a volume ratio of 1:20 to prepare an impregnation solution. The concentration of the waterproof and oil-proof agent is maintained at about 60g / L and the pH value is maintained at 3-5.

[0074] ② Place the spray-coated base fabric after removing the tape on a padding car and perform a double dip / double rolling operation with a rolling rate of 60%. Dry the impregnated spray-coated base fabric at room temperature for half an hour, and then dry it in a blast oven at 150°C for 3 minutes to obtain a padded base fabric.

[0075] The waterproof and oil-proof agent is a commonly used waterproof and oil-proof agent in the industry. For example, the waterproof and oil-proof agent can be the TG-581 waterproof and oil-proof agent produced by Changzhou Di Ri Textile Technology Co., Ltd.

[0076] In some embodiments, S3, S5 and S6 may specifically be:

[0077] Place the prepared melting-promoting coating base cloth with the coating side (i.e., the first surface) facing downwards. Figure 2 As shown, a plurality of adhesive tapes are evenly spaced and pasted on the second surface (i.e., the side without coating) of the melting-promoting coated base cloth to obtain a fabric-tape combined base cloth.

[0078] The prepared dispersion is placed in a spray gun and sprayed on the second surface of the fabric-tape combination base fabric at room temperature. The base fabric is dried at room temperature for half an hour to be initially cured. The initially cured base fabric is then dried in a blast oven at 60° C. for half an hour and taken out to obtain a spray-coated base fabric.

[0079] The tape on the spray-coated base cloth was torn off, and then the spray-coated base cloth with the tape removed was placed on a padding car for padding operation. The impregnated spray-coated base cloth was dried at room temperature for half an hour, and then dried in a blast oven at a temperature of 60° C. for half an hour, and taken out to obtain a padding base cloth.

[0080] In some embodiments, the padding base fabric is soaked in silicone oil for 3 to 6 hours and then taken out.

[0081] Specifically, the impregnated base fabric is soaked in silicone oil for a period of time and then taken out. The principle that oil droplets prevent the formation of ice crystals is utilized to form an oil-impregnated porous smooth surface on the firefighting suit fabric, effectively improving its ice-repellent performance.

[0082] The second aspect of the present application provides a multi-element ice-repellent firefighting clothing fabric, which is prepared by the preparation method described in any one of the first aspects above.

[0083] Specifically, the multi-element ice-repellent firefighting suit fabric has the technical effects described in any of the above embodiments, which will not be elaborated here.

[0084] The present disclosure is further described in detail below with reference to specific embodiments.

[0085] Examples 1 to 3 and Comparative Examples 1 to 14

[0086] A method for preparing a multi-element ice-repellent firefighting uniform fabric comprises the following steps:

[0087] (1) mixing a first aqueous polyurethane liquid, SiC powder, and graphite powder, stirring, adding an additive, and dispersing until the viscosity of the mixed liquid reaches a preset viscosity, stopping the dispersion, and defoaming to obtain a melting-promoting functional coating liquid;

[0088] (2) coating the melt-promoting functional coating liquid on the first surface of the base fabric and drying the base fabric to obtain a melt-promoting coating base fabric;

[0089] (3) pasting a plurality of adhesive tapes at intervals on the second surface of the melt-promoting coated base fabric to obtain a fabric-tape combination base fabric, wherein the second surface is the surface of the melt-promoting coated base fabric away from the first surface;

[0090] (4) dispersing the nano-SiO2 particles in ethyl acetate to obtain a mixed solution, and mixing the mixed solution with a second aqueous polyurethane liquid to obtain a dispersion;

[0091] (5) spraying the dispersion onto the second surface and drying to obtain a spray-coated base fabric;

[0092] (6) removing the adhesive tape from the spray-coated base fabric, and then performing a padding operation on the spray-coated base fabric after the adhesive tape is removed, and drying the padding base fabric to obtain a padding base fabric;

[0093] (7) Soaking the impregnated base fabric in silicone oil, taking it out after a period of time, wiping off the silicone oil on the surface of the impregnated base fabric, and drying it to obtain a multi-element ice-repellent firefighting suit fabric.

[0094] The auxiliary agent is a mixed solution of a dispersant, a defoamer and a thickener, and the weight ratio of the waterborne polyurethane, the dispersant, the defoamer and the thickener is 50:0.1:0.1:0.3.

[0095] The coating thickness of the melting-promoting functional coating liquid is 0.1-0.2 mm.

[0096] The impregnation liquid in the padding operation is a mixture of a waterproof and oil-proof agent and water.

[0097] Soak the padding base fabric in silicone oil for 3 to 6 hours and then take it out

[0098] The base fabric, the preset viscosity, the weight ratio of the first aqueous polyurethane liquid, SiC and graphite, and the weight ratio of the nano-SiO2 particles, ethyl acetate and the second aqueous polyurethane liquid are shown in Table 1 below.

[0099] Comparative Example 15

[0100] Aramid IIIA fabric base is directly used as the fabric of firefighting clothing.

[0101] The firefighting uniform fabrics prepared in Examples 1-3, Comparative Examples 1-14, and the firefighting uniform fabric of Comparative Example 15 were tested for ice repellency according to the test method disclosed in CN112945695A, and for moisture permeability according to GB / T120704.1-2009. The test results are shown in Table 1 below.

[0102] In Table 1, the water-vapour transmission rate (WVT) indicates the mass of water vapor that passes vertically through a unit area of ​​a sample within a specified time under specified temperature and humidity conditions on the surface of the sample.

[0103] Table 1 List of various data and test results of the embodiments and comparative examples

[0104]

[0105]

[0106] As shown in Table 1 above, compared to the comparative examples, the firefighting suit fabrics prepared in Examples 1-3 have lower freezing adhesion strength, indicating that ice on the surface of the fabrics is easily removed and that the fabrics have good deicing and ice repellency. Furthermore, the firefighting suit fabrics prepared in Examples 1-3 have lower moisture permeability, indicating that under the same temperature and humidity conditions, the mass of water vapor passing vertically through a unit area of ​​the firefighting suit fabrics in the examples is less than the mass of water vapor passing vertically through a unit area of ​​the firefighting suit fabrics in the comparative examples in the same time. This further indicates that the moisture permeability of the firefighting suit fabrics described in this application is weak, and water / water vapor does not easily pass through the firefighting suit fabrics, which makes the firefighting suit fabrics less susceptible to ice formation and have good ice repellency.

[0107] In Comparative Examples 1 to 14, due to the excessive or insufficient content of each component added, the frost adhesion strength of the firefighting suit fabrics prepared was greater than that of the fabrics prepared in the examples, and the moisture permeability was also higher than that of the fabrics in the examples. This indicates that the firefighting suit fabrics prepared in the comparative examples have weak deicing performance, but good moisture permeability, so that water vapor can easily pass through the firefighting suit fabrics, making the firefighting suit fabrics easy to freeze and the ice difficult to remove, ultimately resulting in poor ice repellency of the firefighting suit fabrics in the comparative examples.

[0108] In Comparative Example 15, only aramid IIIA fabric base cloth was used as the fire-fighting suit fabric. Since no functional modification was made to the base cloth, the ice-repellent performance of the fire-fighting suit fabric finally obtained was very poor.

[0109] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present disclosure (including the claims) is limited to these examples. Within the scope of the present disclosure, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the embodiments of the present disclosure as described above, which are not provided in detail for the sake of simplicity.

[0110] The embodiments of the present disclosure are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present disclosure should be included in the scope of protection of the present disclosure.

Claims

1. A method for preparing a multi-element ice-repellent firefighting uniform fabric, characterized in that: The steps include: A first aqueous polyurethane liquid, SiC powder, and graphite powder are mixed, stirred, and additives are added, and dispersed until the viscosity of the mixed liquid reaches a preset viscosity, then the dispersion is stopped, and the mixture is defoamed to obtain a melt-promoting functional coating liquid; wherein the weight ratio of the first aqueous polyurethane liquid, SiC powder, and graphite powder is 18-22:0.8-1.2:4-6; and the preset viscosity is 23000-25000 mPa·s; Applying the melt-promoting functional coating liquid on the first surface of the base fabric and drying the base fabric to obtain a melt-promoting coating base fabric, wherein the base fabric is an aramid IIIA fabric base fabric; affixing a plurality of adhesive tapes at intervals on the second surface of the melt-promoting coated base fabric to obtain a fabric-tape combination base fabric, wherein the second surface is the surface of the melt-promoting coated base fabric away from the first surface; Dispersing nano-SiO2 particles in ethyl acetate to obtain a mixed solution, and mixing the mixed solution with a second aqueous polyurethane liquid to obtain a dispersion, wherein the weight ratio of the nano-SiO2 particles, ethyl acetate, and the second aqueous polyurethane liquid is 0.8-1.2:8-12:8-12; spraying the dispersion onto the second surface and drying to obtain a spray-coated base fabric; Removing the adhesive tape from the spray-coated base fabric, and then performing a padding operation on the spray-coated base fabric after the adhesive tape is removed, and drying to obtain a padded base fabric, wherein the impregnation liquid in the padding operation is a mixture of a waterproof and oil-repellent agent and water; The padded base fabric is immersed in silicone oil, taken out after a period of time, the silicone oil on the surface of the padded base fabric is wiped off, and the padded base fabric is dried to obtain a multi-element ice-repellent firefighting suit fabric.

2. The preparation method according to claim 1, characterized in that The auxiliary agent is a mixed solution of a dispersant, a defoamer and a thickener.

3. The preparation method according to claim 2, characterized in that The weight ratio of the waterborne polyurethane, dispersant, defoamer and thickener is 50: 0.1：0.1：0.3。 4. The preparation method according to claim 1, characterized in that The coating thickness of the melting-promoting functional coating liquid is 0.1-0.2 mm.

5. The preparation method according to claim 1, characterized in that The padding base fabric is soaked in silicone oil for 3 to 6 hours and then taken out.

6. A multi-element ice-repellent firefighting clothing fabric, characterized in that: The multi-element ice-repellent firefighting clothing fabric is prepared by the preparation method according to any one of claims 1 to 5.

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