Water-repellent flame-retardant composite fabric and preparation method thereof

Abstract

The invention belongs to the technical field of composite textiles, and discloses a water-repellent flame-retardant composite fabric and a preparation method thereof.The water-repellent flame-retardant composite fabric comprises an outer layer, an inner layer, an outer layer and an inner layer, the middle layer is a polytetrafluoroethylene film; and the inner layer is a flame-retardant lyocell fabric. According to the flame-retardant lyocell fabric, the flame-retardant lyocell fabric is prepared from the flame-retardant lyocell fibers added with the flame retardant in the spinning process, the flame retardant is evenly distributed in the fibers and on the surfaces of the fibers, the flame-retardant performance of the flame-retardant lyocell fabric cannot be affected when water repellent treatment is conducted on the flame-retardant lyocell fabric, and the polytetrafluoroethylene film is excellent in protection performance and has the water-repellent and moisture-permeable effects at the same time; by adopting the three-layer composite structure of the flame-retardant lyocell fabric subjected to water repellent treatment, the polytetrafluoroethylene film and the flame-retardant lyocell fabric, the obtained composite fabric has flame retardance and water repellency, also has the advantages of moisture permeability and air permeability, and is particularly suitable for the fields of firefighter uniform, high-temperature operation protection business wear and the like.

Description

Technical Field

[0001] The invention belongs to the technical field of composite textiles, and in particular relates to a water-repellent and flame-retardant composite fabric and a preparation method thereof. Background Art

[0002] The application of flame retardant materials can effectively prevent the occurrence and spread of fires. Among them, flame retardant fabrics are an important functional prevention material, which are widely used in fire protection clothing, high temperature work protection occupational clothing, curtains, carpets and other fabric textiles in public places such as hotels and hospitals, as well as industrial fabrics. It is very necessary to make flame retardant fabrics water-repellent in some applications, such as at the fire fighting site. If the fire protection clothing is wetted by water, in cold weather, if the water freezes or penetrates the protective clothing into the underwear, it will be very uncomfortable to wear.

[0003] Commonly used flame-retardant fabrics can be given flame-retardant properties by chemically treating the fabrics. However, the flame-retardant function of the fabrics obtained by this method has poor durability and is not resistant to washing. In addition, if the water-repellent function and the flame-retardant function of the fabric are achieved by chemical treatment respectively, during the composite finishing, the water-repellent and the flame-retardant will affect each other because the flame retardant contains a large number of hydrophilic groups, which will reduce the effect of the water-repellent on the one hand and seriously affect the flame-retardant properties of the fabric on the other hand.

[0004] Lyocell fabric has unique advantages in making flame-retardant materials. Compared with the bulkiness and poor softness of aramid fabric, Lyocell fabric is moisture-absorbent, breathable, soft and comfortable, and the clothing made of it has a good wearing experience. Polytetrafluoroethylene (PTFE) membrane has excellent protective properties, and it also has the effect of water repellency and moisture permeability. It is highly comfortable to wear and has good washability. It is often used in composite fabrics.

[0005] However, polytetrafluoroethylene is a hydrophobic material and is mostly used in composites with polyester and nylon fabrics. Lyocell fiber is a cellulose fiber with strong hydrophilicity. When Lyocell fabric is laminated with polytetrafluoroethylene film to form a composite structure, the bonding strength is not high and it is easy to debond after repeated washing.

[0006] In view of this, the present invention is proposed. Summary of the invention

[0007] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and, on the one hand, provide a water-repellent, flame-retardant composite fabric that has both flame-retardant and water-repellent properties and is moisture-permeable and breathable.

[0008] Another aspect of the present invention provides a method for preparing the water-repellent and flame-retardant composite fabric.

[0009] In order to solve the above technical problems, the basic concept of the technical solution adopted by the present invention is:

[0010] A first aspect of the present invention provides a water-repellent flame-retardant composite fabric, comprising:

[0011] The outer layer, made of flame-retardant lyocell fabric padded with a water-repellent finish;

[0012] The middle layer is a polytetrafluoroethylene film;

[0013] The inner layer is flame retardant lyocell fabric.

[0014] In the present invention, the flame retardant lyocell fabric used in the outer layer and the inner layer is made of flame retardant lyocell fiber, wherein the flame retardant lyocell fiber refers to the lyocell fiber made by adding a flame retardant during the spinning process, forming a structure in which the flame retardant is evenly distributed inside and on the surface of the fiber. On the one hand, the flame retardant lyocell fabric made in the above manner has better durability of flame retardant performance, and compared with the flame retardant fabric made by chemical treatment, it does not need to use chemical additives, the processing technology is simple, and there is no pollution to the environment and no wastewater treatment pressure. On the other hand, for the flame retardant lyocell fabric used in the outer layer, since the flame retardant is evenly distributed inside and on the surface of the fiber, the flame retardant performance is less affected by the fiber surface additives, and the water repellent finishing agent padding method can further give the fabric water repellent performance without affecting the flame retardant performance, so as to achieve the coexistence of flame retardant performance and water repellent performance.

[0015] The flame-retardant lyocell fabric is compounded with a polytetrafluoroethylene film, taking advantage of the excellent protective properties of the polytetrafluoroethylene film, as well as its water-repellent and moisture-permeable effects. The inner layer is compounded with a flame-retardant lyocell fabric. The resulting composite fabric has both flame-retardant and water-repellent properties, is moisture-absorbent and breathable, and is soft and comfortable. It has significant advantages in being used as a clothing fabric and provides a good wearing experience. In addition, the application of the polytetrafluoroethylene film can improve the water-repellent properties of the composite fabric and enhance its mechanical strength.

[0016] In a further embodiment, the outer layer and the middle layer are fixed together by adhesive, and / or the middle layer and the inner layer are fixed together by adhesive;

[0017] Preferably, the adhesive is hydrophilic latex.

[0018] In a further embodiment, the surface of the polytetrafluoroethylene film has an etched structure formed by plasma treatment.

[0019] In the above scheme, the surface of the polytetrafluoroethylene film is subjected to plasma treatment, and high-energy particles such as electrons and ions in the plasma collide with the material surface to cause sputtering etching, and the active components in the plasma react with certain groups on the material surface to generate volatile substances to cause etching. The above two effects can both increase the friction coefficient of the material surface and improve its surface wetting properties, thereby increasing the interaction between polytetrafluoroethylene and the adhesive. The bonding difficulty of the polytetrafluoroethylene film after plasma treatment and the outer layer of flame-retardant lyocell fabric is reduced, and the bonding is more firm, avoiding the problem of debonding after multiple washings.

[0020] A second aspect of the present invention provides a method for preparing the water-repellent flame-retardant composite fabric, comprising the following steps:

[0021] (1) soaking the flame-retardant lyocell fabric in a finishing liquid containing a water-repellent finishing agent, rolling it out, and drying it to obtain an outer layer of the water-repellent flame-retardant composite fabric;

[0022] (2) fixing the outer layer obtained in step (1) and the polytetrafluoroethylene film by adhesive;

[0023] (3) allowing the double-layer composite structure obtained in step (2) to stand for curing to obtain a double-layer composite fabric;

[0024] (4) fixing the double-layer composite fabric obtained in step (3) and the flame-retardant lyocell fabric by adhesive, wherein the flame-retardant lyocell fabric is attached to the side where the polytetrafluoroethylene film is located;

[0025] (5) The three-layer composite structure obtained in step (4) is allowed to stand for curing to obtain a water-repellent and flame-retardant composite fabric.

[0026] As a specific implementation, the water-repellent finishing agent used in step (1) is water-repellent finishing agent FK-5316, the main component of which is a fluorocarbon high molecular polymer emulsion based on a C8 structure.

[0027] Through the above scheme, a composite fabric composed of a water-repellent treated flame-retardant lyocell fabric, a polytetrafluoroethylene film and a flame-retardant lyocell fabric arranged layer by layer can be made, which has both flame-retardant and water-repellent properties, and also has the function of moisture permeability and air permeability, which can greatly improve the wearing value of the composite fabric. The flame-retardant property is provided by the flame-retardant lyocell fiber to which the flame retardant is added during the spinning process, and the durability of the flame-retardant property is better and is basically not affected by the water-repellent finishing agent. Moreover, compared with the scheme in the prior art that imparts flame-retardant properties through chemical treatment, the scheme of the present invention uses only a small amount of chemical reagents, which reduces production costs and reduces pollution to the environment.

[0028] In a further embodiment, in step (1), the flame retardant lyocell fabric soaked in the finishing liquid is rolled out, dried at 110 to 120°C for 3 to 5 minutes, and then baked at 150 to 180°C for 1 to 5 minutes.

[0029] As a specific implementation method, the flame retardant lyocell fabric is placed in an oven for drying, and the drying conditions are set to dry at 110-120° C. for 3-5 minutes, and then bake at 150-180° C. for 1-5 minutes.

[0030] In the above scheme, the drying is first carried out at a relatively low temperature of 110-120°C, and then the temperature is raised to 150-180°C for further baking. In this way, it is possible to avoid the temperature being too high in the initial stage of drying, which causes the finishing liquid to evaporate quickly and flow to the surface of the fabric, forming the water-repellent finishing agent to aggregate, resulting in uneven distribution in the fabric, and affecting the water-repellent effect of the fabric.

[0031] In a further embodiment, in step (1), the flame retardant lyocell fabric is immersed in a water repellent finishing agent for 5 to 10 minutes, and the liquid carrying rate of the fabric after being rolled out is 50% to 70%;

[0032] Preferably, the concentration of the water-repellent finishing agent in the finishing liquid is 20 to 80 g / L.

[0033] As a specific embodiment, the flame retardant lyocell fabric is rolled out by rollers to remove excess finishing liquid.

[0034] In a further embodiment, in step (1), the fabric is dried and then calendered.

[0035] In the above scheme, the flame-retardant lyocell fabric is calendered to remove wrinkles on the fabric surface and improve the flatness of the fabric surface, which is conducive to better bonding and fixing with the polytetrafluoroethylene film in the future and avoids the existence of wrinkles affecting the bonding firmness.

[0036] In a further embodiment, in step (2), the polytetrafluoroethylene membrane is subjected to plasma treatment and then compositely fixed with the outer layer;

[0037] Preferably, the power of the plasma treatment is 20 to 200 W, and the treatment time is 5 to 15 minutes.

[0038] As a specific implementation method, the polytetrafluoroethylene film is placed in a plasma device for treatment, the power is set to 20 to 200 W, and the treatment time is 5 to 15 minutes.

[0039] In the above scheme, the polytetrafluoroethylene film is first subjected to plasma treatment to form an uneven etched structure on the surface of the polytetrafluoroethylene film, which can increase the friction coefficient of the material surface, improve the surface wetting performance, and thus increase the interaction between the polytetrafluoroethylene film and the adhesive. The polytetrafluoroethylene film treated with plasma is composited and fixed with the water-repellent treated flame-retardant lyocell fabric through an adhesive, which can improve the adhesion of the two, improve the washing resistance of the composite fabric, and avoid the problem of debonding after repeated washing.

[0040] In a further embodiment, in step (2) and / or step (4), when composite fixing is performed by adhesive, the melting and bonding temperatures are 110 to 120°C.

[0041] In a further embodiment, in step (3) and / or step (5), curing is performed under constant temperature and humidity conditions, wherein the curing conditions include: a curing temperature of 30 to 60° C., a curing humidity of 60% to 80%, and a treatment time of 15 to 36 hours;

[0042] Preferably, the curing temperature is 40-50°C, more preferably 40°C;

[0043] Preferably, the curing humidity is 70% to 80%, more preferably 70%;

[0044] Preferably, the treatment time is 20 to 26 hours;

[0045] Preferably, the curing reaction is carried out in a constant temperature and humidity chamber.

[0046] As a specific implementation method, in step (2), the flame-retardant lyocell fabric treated with water repellent and the polytetrafluoroethylene film treated with plasma are glued by a patterned glue roller in a dot-shaped mesh manner. After the polytetrafluoroethylene film and the flame-retardant lyocell fabric are composited, the melting and bonding temperature is 110 to 120°C.

[0047] In step (3), the laminated polytetrafluoroethylene film and the flame-retardant lyocell fabric treated with water repellent are placed in a constant temperature and humidity chamber for curing reaction, and cured for 15 to 36 hours under curing conditions of temperature 30 to 60° C. and humidity 60% to 80%, to obtain a double-layer composite fabric.

[0048] As a specific implementation, in step (4), the double-layer composite fabric and the flame-retardant lyocell fabric as the inner layer are glued by a patterned glue roller in a dot-shaped mesh manner, and the melting and bonding temperature is 110-120°C.

[0049] In step (5), the three-layer composite structure formed by laminating the flame-retardant lyocell fabric and the double-layer composite fabric is placed in a constant temperature and humidity chamber for curing reaction, and cured for 15 to 36 hours under curing conditions of temperature 30 to 60° C. and humidity 60% to 80%, thereby obtaining a water-repellent flame-retardant composite fabric.

[0050] In the above scheme, after the two adjacent layers of the composite fabric are glued together, a curing reaction is carried out under constant temperature and humidity conditions, so that the polytetrafluoroethylene film can be firmly bonded to the fabrics on both sides, further improving the durability and permanence of the composite fabric. Different from the prior art method of simply bonding by gluing, the composite fabric of the present invention can achieve a higher level in terms of bonding firmness and service life.

[0051] In a specific embodiment of the present invention, the preparation method specifically comprises the following steps:

[0052] (1) soaking the flame-retardant lyocell fabric in a finishing liquid containing a water-repellent finishing agent, wherein the concentration of the water-repellent finishing agent in the finishing liquid is 20 to 80 g / L, and the soaking time is 5 to 10 min; rolling the fabric out with a roller, wherein the fabric has a liquid carrying rate of 50% to 70% after rolling out, placing the flame-retardant lyocell fabric in an oven for drying, wherein the drying conditions are set to be drying at 110 to 120° C. for 3 to 5 min, and then baking at 150 to 180° C. for 1 to 5 min; and performing a calendering treatment on the dried flame-retardant lyocell fabric to obtain an outer layer of the water-repellent flame-retardant composite fabric;

[0053] (2) placing the polytetrafluoroethylene film in a plasma device for treatment, setting the power to 20 to 200 W and the treatment time to 5 to 15 min; the treated polytetrafluoroethylene film and the outer layer obtained in step (1) are glued by a patterned glue roller in a dot-shaped mesh pattern to be composited, and the melting and laminating temperature is 110 to 120° C.;

[0054] (3) placing the double-layer composite structure formed by laminating the outer layer with the polytetrafluoroethylene film in a constant temperature and humidity chamber for curing reaction, curing for 15 to 36 hours under curing conditions of a temperature of 30 to 60° C. and a humidity of 60% to 80%, to obtain a double-layer composite fabric;

[0055] (4) The double-layer composite fabric obtained in step (3) and the flame-retardant lyocell fabric are laminated by gluing them in a dot-shaped mesh pattern using a patterned glue roller, and the melting and laminating temperature is 110-120° C.;

[0056] (5) The three-layer composite structure obtained in step (4) is placed in a constant temperature and humidity chamber for curing reaction, and cured for 15 to 36 hours under curing conditions of a temperature of 30 to 60° C. and a humidity of 60% to 80%, thereby obtaining a water-repellent flame-retardant composite fabric.

[0057] After adopting the above technical scheme, the present invention has the following beneficial effects compared with the prior art.

[0058] 1. The flame-retardant lyocell fabric is treated with a water-repellent finishing agent to prevent the flame-retardant component from conflicting with the water-repellent component. The fabric has both high flame-retardant and water-repellent properties. When combined with a polytetrafluoroethylene film, the water-repellent property is further improved. The composite fabric is also endowed with moisture-permeable and breathable properties, and the mechanical strength is enhanced, greatly improving the wearing value of the composite fabric.

[0059] 2. After the polytetrafluoroethylene film is plasma treated, it is compounded with the flame-retardant lyocell fabric. Since the interaction between the polytetrafluoroethylene film and the adhesive is enhanced, the bonding is more firm and can withstand repeated washing without separation, thus solving the problem of the existing composite fabric being unable to withstand repeated washing times.

[0060] 3. After gluing and bonding, curing is carried out under constant temperature and humidity conditions, which is conducive to a more firm bond between the polytetrafluoroethylene film and the bonded fabric, and is conducive to improving the durability and permanence of the composite fabric, so that the obtained water-repellent flame-retardant composite fabric has a higher level in terms of bonding firmness and service life.

[0061] 4. During the preparation process, only a small amount of chemical reagents are used, which reduces production costs and reduces pollution to the environment.

[0062] The specific embodiments of the present invention are described in further detail below. DETAILED DESCRIPTION

[0063] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0064] Example 1

[0065] This embodiment adopts the following preparation method to prepare the water-repellent flame-retardant composite fabric, which specifically includes the following steps:

[0066] (1) soaking the flame-retardant lyocell fabric in a finishing liquid, wherein the concentration of the water-repellent finishing agent in the finishing liquid is 40 g / L, and the soaking time is 8 min; rolling out the fabric by a roller, wherein the fabric has a liquid carrying rate of 65% after rolling out; placing the flame-retardant lyocell fabric in an oven for drying, wherein the drying conditions are set to be 120° C. for drying for 5 min, and then baking at 170° C. for 1 min; and performing a calendering treatment on the dried flame-retardant lyocell fabric to obtain an outer layer of a water-repellent flame-retardant composite fabric;

[0067] (2) placing the polytetrafluoroethylene film in a plasma device for treatment, setting the power to 100 W and the treatment time to 10 min; the treated polytetrafluoroethylene film and the outer layer obtained in step (1) are glued by a patterned glue roller in a dot-shaped mesh pattern to be composited, and the melting and laminating temperature is 115° C. wherein the adhesive used is a hydrophilic latex;

[0068] (3) placing the double-layer composite structure formed by laminating the outer layer with the polytetrafluoroethylene film in a constant temperature and humidity chamber for curing reaction, and curing for 24 hours under the curing conditions of temperature 40° C. and humidity 70%, to obtain a double-layer composite fabric;

[0069] (4) The double-layer composite fabric obtained in step (3) and the flame-retardant lyocell fabric are laminated by gluing them in a dot-shaped mesh pattern using a patterned glue roller, and the melting and laminating temperature is 115° C. wherein the adhesive used is a hydrophilic latex;

[0070] (5) The three-layer composite structure obtained in step (4) is placed in a constant temperature and humidity chamber for curing reaction, and cured for 24 hours under curing conditions of a temperature of 40° C. and a humidity of 70%, thereby obtaining a water-repellent flame-retardant composite fabric.

[0071] Example 2

[0072] This embodiment adopts the following preparation method to prepare the water-repellent flame-retardant composite fabric, which specifically includes the following steps:

[0073] (1) soaking the flame-retardant lyocell fabric in a finishing liquid, wherein the concentration of the water-repellent finishing agent in the finishing liquid is 60 g / L, and the soaking time is 5 min; rolling out the fabric through a roller, wherein the fabric has a liquid carrying rate of 70% after rolling out, placing the flame-retardant lyocell fabric in an oven for drying, wherein the drying conditions are set to be 110° C. for drying for 5 min, and then baking at 180° C. for 2 min; performing a calendering treatment on the dried flame-retardant lyocell fabric to obtain an outer layer of a water-repellent flame-retardant composite fabric;

[0074] (2) placing the polytetrafluoroethylene film in a plasma device for treatment, setting the power to 200 W and the treatment time to 5 min; the treated polytetrafluoroethylene film and the outer layer obtained in step (1) are glued by a patterned glue roller in a dot-shaped mesh pattern to be composited, and the melting and laminating temperature is 120° C. wherein the adhesive used is a hydrophilic latex;

[0075] (3) placing the double-layer composite structure formed by laminating the outer layer with the polytetrafluoroethylene film in a constant temperature and humidity chamber for curing reaction, and curing for 24 hours under the curing conditions of temperature 40° C. and humidity 70%, to obtain a double-layer composite fabric;

[0076] (4) The double-layer composite fabric obtained in step (3) and the flame-retardant lyocell fabric are laminated by gluing them in a dot-shaped mesh pattern using a patterned glue roller, and the melting and laminating temperature is 120° C. wherein the adhesive used is a hydrophilic latex;

[0077] (5) The three-layer composite structure obtained in step (4) is placed in a constant temperature and humidity chamber for curing reaction, and cured for 24 hours under curing conditions of a temperature of 40° C. and a humidity of 70%, thereby obtaining a water-repellent flame-retardant composite fabric.

[0078] Example 3

[0079] This embodiment adopts the following preparation method to prepare the water-repellent flame-retardant composite fabric, which specifically includes the following steps:

[0080] (1) soaking the flame-retardant lyocell fabric in a finishing liquid, wherein the concentration of the water-repellent finishing agent in the finishing liquid is 80 g / L, and the soaking time is 10 min; rolling out the fabric by a roller, wherein the fabric has a liquid carrying rate of 50% after rolling out, placing the flame-retardant lyocell fabric in an oven for drying, wherein the drying conditions are set to be 120° C. for drying for 3 min, and then baking at 160° C. for 5 min; and performing a calendering treatment on the dried flame-retardant lyocell fabric to obtain an outer layer of a water-repellent flame-retardant composite fabric;

[0081] (2) placing the polytetrafluoroethylene film in a plasma device for treatment, setting the power to 50 W and the treatment time to 15 min; the treated polytetrafluoroethylene film and the outer layer obtained in step (1) are glued by a patterned glue roller in a dot-shaped mesh pattern to be composited, and the melting and laminating temperature is 110° C. wherein the adhesive used is a hydrophilic latex;

[0082] (3) placing the double-layer composite structure formed by laminating the outer layer with the polytetrafluoroethylene film in a constant temperature and humidity chamber for curing reaction, and curing for 24 hours under the curing conditions of temperature 40° C. and humidity 70%, to obtain a double-layer composite fabric;

[0083] (4) The double-layer composite fabric obtained in step (3) and the flame-retardant lyocell fabric are glued by a patterned glue roller in a dot-shaped mesh pattern to be composited, and the melting and laminating temperature is 110° C., wherein the adhesive glue used is a hydrophilic latex;

[0084] (5) The three-layer composite structure obtained in step (4) is placed in a constant temperature and humidity chamber for curing reaction, and cured for 24 hours under curing conditions of a temperature of 40° C. and a humidity of 70%, thereby obtaining a water-repellent flame-retardant composite fabric.

[0085] Comparative Example 1

[0086] In this comparative example, based on the above-mentioned Example 1, the operation of subjecting the flame-retardant lyocell fabric to water repellent treatment in step (1) is not performed, and the flame-retardant lyocell fabric is directly calendered, and then the subsequent steps (2) to (5) are performed, wherein the process conditions and parameters involved remain unchanged.

[0087] Comparative Example 2

[0088] In this comparative example, based on the above-mentioned Example 1, steps (2) and (3) are not performed, and the flame-retardant lyocell fabric after water repellent treatment is directly fixed with another flame-retardant lyocell knitted fabric by adhesive, and then cured under constant temperature and humidity conditions to obtain a two-layer composite fabric. The gluing method, adhesive type and curing conditions are the same as those involved in steps (4) and (5) in Example 1.

[0089] Comparative Example 3

[0090] This comparative example is based on the above Example 1, except that the flame-retardant lyocell fabric used therein is replaced with a flame-retardant polyester fabric, and other process steps and conditions remain unchanged. The flame-retardant polyester fabric is made of polyester fiber to which a flame retardant is added during spinning.

[0091] Test Example 1

[0092] In this test example, the flame retardant properties, water repellent properties and antistatic properties of the composite fabrics prepared in Example 1 and Comparative Examples 1-3 were compared through experiments, wherein:

[0093] Antistatic performance test method: refer to the national standard GB / T 12703.2-2009 "Evaluation of electrostatic properties of textiles Part 2: Charge surface density";

[0094] Surface moisture resistance test method: refer to the national standard GB / T 4745-2012 "Testing and evaluating the waterproof performance of textiles by water dipping method";

[0095] Hydrostatic pressure test method: refer to GB / T 4744-2013 "Hydrostatic pressure method for testing and evaluating the waterproof performance of textiles";

[0096] Flame retardant performance test method: refer to GB 8965.1-2020 "Protective Clothing Flame Retardant Clothing".

[0097] The test results of the above items are shown in Table 1 and Table 2.

[0098] Table 1

[0099] Hydrostatic pressure(Kpa) Surface moisture resistance (grade) <![CDATA[Surface charge density (μC / m 2 )]]> Example 1 ＞200 3 0.9 Comparative Example 1 ＞200 1 1.0 Comparative Example 2 0 3 1.1 Comparative Example 3 ＞200 3 5.2

[0100] It can be seen from the data in Table 1 that the water-repellent flame-retardant composite fabric obtained in Example 1 has strong resistance to hydrostatic pressure and strong surface moisture resistance, indicating that it has a good water-repellent effect, is impermeable and not easily soaked by water. At the same time, the measured charge surface density is very low, indicating that it has good antistatic ability, and can improve wearing comfort as a clothing fabric. At the same time, thanks to its antistatic properties, it is also suitable for use as a clothing fabric for firefighting uniforms or other special industries.

[0101] Although the polytetrafluoroethylene film can prevent water permeation in Comparative Example 1, the surface moisture resistance is poor, indicating that the composite fabric is easily wetted. In Comparative Example 2, since no polytetrafluoroethylene film is provided, the flame-retardant fiber fabric treated with water repellent has a certain surface moisture resistance, but the ability to resist hydrostatic pressure is poor and it is easy to permeate water.

[0102] Comparative Example 3 uses flame-retardant polyester fabric instead of flame-retardant lyocell fabric, and its charge surface density is significantly higher than that of Example 1, indicating that the antistatic effect is poor. When used as clothing fabric, it affects the wearing comfort and is not suitable as clothing fabric for firefighter uniforms, etc.

[0103] Table 2

[0104]

[0105] It can be seen from the data in Table 2 that in terms of flame retardancy, the composite fabric prepared in Example 1 is substantially equivalent to that of Comparative Examples 1-3.

[0106] Based on the above test results, it can be seen that the water-repellent flame-retardant composite fabric provided by the present invention has both flame-retardant properties and water-repellent properties, and the water-repellent property is better. At the same time, it also has antistatic properties and can be applied in a wider range of fields.

[0107] In this test example, the water-repellent flame-retardant composite fabrics prepared in Examples 2 and 3 were also subjected to the above-mentioned flame-retardant and water-repellent performance tests, and the flame-retardant and water-repellent effects were close to those in Example 1.

[0108] Comparative Example 4

[0109] In this comparative example, based on the above-mentioned Example 1, the curing conditions in steps (3) and (5) were changed to be cured by standing for 24 hours in a conventional indoor environment, and the other steps and process conditions remained unchanged.

[0110] Test Example 2

[0111] In this test example, the durability and mechanical strength of the composite fabrics prepared in Example 1 and Comparative Example 4 were compared through experiments, wherein:

[0112] The durability test index is the number of times the fabric can be washed, and the test method refers to GB / T 8629-2017 "Household Washing and Drying Procedure for Textile Testing";

[0113] The mechanical strength test index is the breaking strength of the fabric, and the test method refers to the standard GB / T 3923.1-2013 "Tensile properties of textile fabrics Part 1: Determination of breaking strength and elongation at break (strip method)".

[0114] The test results of the above items are shown in Table 3.

[0115] Table 3

[0116]

[0117] It can be seen that after the gluing and lamination, the curing reaction is carried out under constant temperature and humidity conditions, so that the polytetrafluoroethylene film can be more firmly attached to the fabrics on both sides, and can withstand repeated washing without debonding. At the same time, the breaking strength of the composite fabric is improved, and the mechanical properties of the composite fabric are improved.

[0118] Test Example 3

[0119] This test example investigates the effect of curing temperature on the performance of the composite fabric. Specifically, on the basis of the above Example 1, only the curing temperature in steps (3) and (5) was changed to prepare different composite fabric samples, and the durability and mechanical strength were tested respectively. The test method was the same as that of Example 2, and the test results are shown in Table 4.

[0120] Table 4

[0121]

[0122] According to the above test results, it can be seen that in the present invention, the curing temperature is controlled at 30-60° C., and the prepared composite fabric has better water-resistant effect and greater mechanical strength.

[0123] Furthermore, when the curing temperature is greater than or equal to 40°C, the washing resistance reaches more than 100 times, and the breaking strength in the radial direction and the weft direction reaches more than 770N and 751N, respectively, with better mechanical properties. However, when the curing temperature is 60°C, the breaking strength decreases slightly compared with the lower curing temperature. Therefore, in the preferred embodiment of the present invention, the curing temperature is controlled at 40-50°C.

[0124] Since the durability and mechanical strength of the composite fabric do not change much when the curing temperature is between 40 and 50°C, a better solution is to control the curing temperature at 40°C for energy saving purposes.

[0125] Test Example 4

[0126] This test example investigates the effect of curing humidity on the performance of the composite fabric. Specifically, on the basis of the above Example 1, only the curing humidity in steps (3) and (5) was changed to prepare different composite fabric samples, and the durability and mechanical strength were tested respectively. The test method was the same as that of Test Example 2, and the test results are shown in Table 5.

[0127] Table 5

[0128]

[0129] According to the above test results, the curing humidity is controlled at 60% to 80% in the present invention, and the prepared composite fabric has good water washing resistance, the washing times are not less than 65 times, and the mechanical strength is relatively greater.

[0130] Furthermore, when the curing humidity is between 70% and 80%, the washing resistance reaches more than 100 times, and the breaking strength in the radial and weft directions reaches more than 775N and 756N, respectively, with better mechanical properties. Therefore, in the preferred embodiment of the present invention, the curing humidity is controlled at 70% to 80%.

[0131] Furthermore, when the curing humidity is between 70% and 80%, the durability and mechanical strength of the composite fabric do not change much. A better solution is to control the curing humidity at 70%.

[0132] Comparative Example 5

[0133] In this comparative example, based on the above-mentioned Example 1, the operation of step (2) is adjusted, and the operation of "putting the polytetrafluoroethylene film into the plasma equipment for treatment, setting the power to 100 W, and the treatment time to 10 min" is cancelled, while the other steps and process conditions remain unchanged.

[0134] Test Example 5

[0135] In this test example, the durability and mechanical strength of the composite fabrics prepared in Example 1 and Comparative Example 5 were compared by testing. The testing method was the same as that in Test Example 2. The test results are shown in Table 6.

[0136] Table 6

[0137]

[0138] From the above results, it can be seen that the polytetrafluoroethylene film without plasma treatment is bonded and fixed to the fabrics on both sides in Comparative Example 5, and the number of washing resistance is significantly less than that of the solution in Example 1, indicating that the present invention improves the bonding firmness between the two layers by plasma treatment of the polytetrafluoroethylene film, thereby improving the washing resistance of the composite fabric. At the same time, the breaking strength of the composite fabric prepared in Example 1 in the radial direction is significantly higher than that in Comparative Example 5, and the breaking strength in the weft direction is basically the same as that in Comparative Example 5, indicating that the mechanical properties of the composite fabric obtained by pre-plasma treatment of the polytetrafluoroethylene film are also improved.

[0139] The above is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment, it is not used to limit the present invention. Any technician familiar with this patent can make some changes or modify the technical contents suggested above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the solution of the present invention.

Claims

1. A water-repellent flame-retardant composite fabric, characterized in that: include: The outer layer, made of flame-retardant lyocell fabric padded with a water-repellent finish; The middle layer is a polytetrafluoroethylene film; The inner layer is flame retardant lyocell fabric.

2. The water-repellent flame-retardant composite fabric according to claim 1, characterized in that: The outer layer and the middle layer are fixed together by adhesive, and / or the middle layer and the inner layer are fixed together by adhesive; Preferably, the adhesive is hydrophilic latex.

3. The water-repellent flame-retardant composite fabric according to claim 2, characterized in that: The surface of the polytetrafluoroethylene film has an etched structure formed by plasma treatment.

4. A method for preparing the water-repellent flame-retardant composite fabric according to any one of claims 1 to 3, characterized in that: The following steps are involved: (1) soaking the flame-retardant lyocell fabric in a finishing liquid containing a water-repellent finishing agent, rolling it out, and drying it to obtain an outer layer of the water-repellent flame-retardant composite fabric; (2) fixing the outer layer obtained in step (1) and the polytetrafluoroethylene film by adhesive; (3) allowing the double-layer composite structure obtained in step (2) to stand for curing to obtain a double-layer composite fabric; (4) fixing the double-layer composite fabric obtained in step (3) and the flame-retardant lyocell fabric by adhesive, wherein the flame-retardant lyocell fabric is attached to the side where the polytetrafluoroethylene film is located; (5) The three-layer composite structure obtained in step (4) is allowed to stand for curing to obtain a water-repellent and flame-retardant composite fabric.

5. The method for preparing the water-repellent flame-retardant composite fabric according to claim 4, characterized in that: In step (1), after the flame retardant lyocell fabric soaked in the finishing liquid is rolled out, it is dried at 110-120° C. for 3-5 minutes, and then baked at 150-180° C. for 1-5 minutes.

6. The method for preparing the water-repellent flame-retardant composite fabric according to claim 4 or 5, characterized in that: In step (1), the flame retardant lyocell fabric is immersed in the finishing liquid for 5 to 10 minutes, and the liquid carrying rate of the fabric after being rolled out is 50% to 70%; Preferably, the concentration of the water-repellent finishing agent in the finishing liquid is 20 to 80 g / L.

7. The method for preparing the water-repellent flame-retardant composite fabric according to any one of claims 4 to 6, characterized in that: In step (1), the fabric is dried and then calendered.

8. The method for preparing the water-repellent flame-retardant composite fabric according to any one of claims 4 to 7, characterized in that: In step (2), the polytetrafluoroethylene membrane is subjected to plasma treatment and then compositely fixed with the outer layer; Preferably, the power of the plasma treatment is 20 to 200 W, and the treatment time is 5 to 15 minutes.

9. The method for preparing the water-repellent flame-retardant composite fabric according to any one of claims 4 to 8, characterized in that: In step (2) and / or step (4), when composite fixing is performed by adhesive, the melting and bonding temperatures are 110 to 120°C.

10. The method for preparing the water-repellent flame-retardant composite fabric according to any one of claims 4 to 9, characterized in that: In step (3) and / or step (5), curing is performed under constant temperature and humidity conditions, wherein the curing conditions include: a curing temperature of 30 to 60° C., a curing humidity of 60% to 80%, and a processing time of 15 to 36 hours; Preferably, the curing temperature is 40-50°C, more preferably 40°C; Preferably, the curing humidity is 70% to 80%, more preferably 70%; Preferably, the treatment time is 20 to 26 hours; Preferably, the curing reaction is carried out in a constant temperature and humidity chamber.

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