Multifunctional brocade cotton blended fabric and preparation method thereof

Abstract

The invention relates to a multifunctional brocade cotton blended fabric and a preparation method thereof, and belongs to the technical field of functional fabrics. The preparation method disclosed by the invention comprises the following steps: S1, carrying out rolling and baking treatment on the brocade and cotton blended fabric by adopting octa-epoxy cyclohexyl ethyl cage-shaped polysilsesquioxane finishing liquid, so as to obtain a primarily finished brocade and cotton blended fabric; s2, carrying out rolling and baking treatment on the primarily finished brocade and cotton blended fabric by adopting tetrakis (hydroxymethyl) phosphonium chloride urea precondensate finishing liquid to obtain a secondarily finished brocade and cotton blended fabric; and carrying out rolling and baking treatment on the secondarily finished brocade and cotton blended fabric by using 3-aminopropyltriethoxysilane finishing liquid to obtain the multifunctional brocade and cotton blended fabric. The flame-retardant brocade cotton blended fabric has high flame retardance, smoke suppression performance and washing resistance.

Description

Technical Field

[0001] The invention belongs to the technical field of functional fabrics, and in particular relates to a multifunctional nylon-cotton blended fabric and a preparation method thereof. Background Art

[0002] Nylon-cotton blended fabric is a fabric that combines the advantages of cotton fiber and nylon fiber. It is soft and comfortable, breathable, stretchable, wear-resistant, wrinkle-resistant and durable. This fabric is widely used in sports equipment, outdoor equipment, fashion clothing, home textiles and industrial uses. However, in special occasions such as military and industrial fields, nylon-cotton blended fabrics need to have flame retardant properties, which is technically difficult because cotton fibers form a carbon support when they burn, and nylon fibers cannot drip after melting and covering the carbon support, causing heat and fuel to accumulate, forming a flammable "support" effect. In addition, the flame retardant effect of nylon-cotton blended fabrics needs to be durable, and the development of flame retardant finishing technology that is resistant to washing remains a challenge.

[0003] Liu Yawen, Yang Yunyu, Guan Jinping et al. (Flame-retardant coating finishing of nylon-cotton blended fabrics [J]. Printing and Dyeing, 2022, 48(3): 12-15.) mixed phosphate flame retardant FR-8526 with water-based polyurethane for flame-retardant coating finishing of nylon-cotton blended fabrics. The flame retardant was adhered to the fabric surface through the adhesive water-based polyurethane, resulting in serious damage to the fabric's physical properties such as air permeability.

[0004] Tetrakis (hydroxymethyl) phosphonium chloride (THPC) is a durable flame retardant finishing agent commonly used for flame retardant treatment of cotton fabrics. During the treatment process, THPC undergoes a condensation reaction with substances such as urea to form a water-soluble pre-shrinkage body. Subsequently, through ammonia fumigation treatment, the bonding between the condensation product and the cotton fiber is enhanced, so that a flame retardant polymer with a network structure is formed inside the fiber, thereby improving the flame retardant properties of the cotton fabric. However, this traditional process has some limitations. First, the cost of ammonia fumigation equipment is relatively high, and greater environmental pollution may be generated during the treatment process. Secondly, because the condensation product is mainly deposited inside the cotton fiber, it cannot undergo a covalent bond grafting reaction with the cotton fiber, and its affinity for nylon fiber is insufficient, resulting in poor durability in nylon-cotton blended fabrics.

[0005] Li Ya, Shan Zhihua, Jiang Lan, et al. (Study on in-situ tanning of THP salts and dicyandiamide [J]. Fine Chemicals, 2006, 23(8):797-800.) used tetrakis(hydroxymethyl)phosphonium chloride) to react with dicyandiamide and tanned goat leather, achieving a certain flame retardant effect. However, the condensation product prepared by this method still had a high water solubility and could not form a strong bond with nylon-cotton blended fabrics, resulting in poor flame retardancy and durability of the modified nylon-cotton blended fabrics.

[0006] Therefore, it is of great significance to develop durable flame-retardant and smoke-suppressing nylon-cotton blended fabrics. Summary of the Invention

[0007] In order to solve the above technical problems, the present invention provides a multifunctional nylon-cotton blended fabric and a preparation method thereof. The nylon-cotton blended fabric is modified by using octaepoxycyclohexylethyl caged polysilsesquioxane, tetrakishydroxymethylphosphonium chloride urea precondensate and 3-aminopropyltriethoxysilane to obtain a durable flame retardant and smoke suppressant nylon-cotton blended fabric.

[0008] The first object of the present invention is to provide a method for preparing a multifunctional nylon-cotton blended fabric, comprising the following steps:

[0009] S1, dissolving octaepoxycyclohexylethyl caged polysilsesquioxane in a first solvent to obtain an octaepoxycyclohexylethyl caged polysilsesquioxane finishing solution; performing a padding and baking treatment on a nylon-cotton blended fabric using the octaepoxycyclohexylethyl caged polysilsesquioxane finishing solution to obtain a primary-finished nylon-cotton blended fabric;

[0010] S2, dissolving tetrakis(hydroxymethyl)phosphonium chloride urea precondensate in water to obtain a tetrakis(hydroxymethyl)phosphonium chloride urea precondensate finishing liquid; performing a padding and baking treatment on a primary finished nylon-cotton blended fabric using the tetrakis(hydroxymethyl)phosphonium chloride urea precondensate finishing liquid to obtain a secondary finished nylon-cotton blended fabric;

[0011] S3. Dissolving 3-aminopropyltriethoxysilane in a second solvent to obtain a 3-aminopropyltriethoxysilane finishing solution; and performing a padding and baking treatment on the secondary finished nylon-cotton blended fabric using the 3-aminopropyltriethoxysilane finishing solution to obtain the multifunctional nylon-cotton blended fabric.

[0012] In one embodiment of the present invention, in S1, the concentration of octaepoxycyclohexylethyl caged polysilsesquioxane in the octaepoxycyclohexylethyl caged polysilsesquioxane finishing liquid is 50 g / L-70 g / L; octaepoxycyclohexylethyl caged polysilsesquioxane is rich in epoxy groups and can undergo cross-linking reactions with the hydroxyl groups of cotton fibers and the amino groups of nylon fibers in nylon-cotton blended fabrics, thereby grafting active epoxy groups onto the nylon-cotton blended fabric, making the surface of the nylon-cotton blended fabric rich in active epoxy groups. The higher the amount of octaepoxycyclohexylethyl caged polysilsesquioxane used, the better the grafting effect on the nylon-cotton blended fabric, but too high an amount will be wasteful.

[0013] In one embodiment of the present invention, in S1, the immersion time of the rolling and baking treatment is 5min-10min, the rolling rate is 90%-100%, the drying temperature is 90℃-100℃, the drying time is 1min-2min, the baking temperature is 150℃-160℃, and the baking time is 2min-3min.

[0014] In one embodiment of the present invention, in S1, the first solvent is chloroform.

[0015] In one embodiment of the present invention, in S2, the concentration of the tetrakis (hydroxymethyl) phosphonium chloride urea precondensate in the tetrakis (hydroxymethyl) phosphonium chloride urea precondensate finishing liquid is 130 g / L-180 g / L; the higher the amount of the tetrakis (hydroxymethyl) phosphonium chloride urea precondensate used, the better the flame retardant effect of the coated nylon-cotton blended fabric, but too high an amount is wasteful.

[0016] In one embodiment of the present invention, in S2, the immersion time of the rolling and baking treatment is 5min-10min, the rolling rate is 90%-100%, the drying temperature is 80℃-90℃, the drying time is 2min-3min, the baking temperature is 150℃-160℃, and the baking time is 2min-3min.

[0017] In one embodiment of the present invention, in S3, the concentration of 3-aminopropyltriethoxysilane in the 3-aminopropyltriethoxysilane finishing solution is 40 g / L-60 g / L; the amino group of 3-aminopropyltriethoxysilane can react with excess hydroxymethyl groups. The higher the amount of 3-aminopropyltriethoxysilane used, the more conducive it is to grafting on the nylon-cotton blended fabric, and too high an amount is wasteful.

[0018] In one embodiment of the present invention, in S3, the immersion time of the rolling and baking treatment is 5min-10min, the rolling rate is 90%-100%, the drying temperature is 80℃-90℃, the drying time is 2min-3min, the baking temperature is 150℃-160℃, and the baking time is 2min-3min.

[0019] In one embodiment of the present invention, in S3, the second solvent is ethanol.

[0020] The second object of the present invention is to provide a multifunctional nylon-cotton blended fabric prepared by the method described above.

[0021] In one embodiment of the present invention, the limiting oxygen index of the multifunctional nylon-cotton blended fabric is not less than 30.0%, the damaged length is not higher than 10.7 cm, and the total amount of smoke released is not higher than 0.54 m 2 , reaching flame retardant B1 level; after 40 washes, the damaged length is still less than 14.7cm, reaching flame retardant B1 level, with excellent flame retardant properties, smoke suppression properties and water washability.

[0022] The technical solution of the present invention has the following advantages over the prior art:

[0023] (1) The preparation method of the present invention first uses octaepoxycyclohexylethyl caged polysilsesquioxane to modify the nylon-cotton blended fabric. The octaepoxycyclohexylethyl caged polysilsesquioxane contains a large number of active epoxy groups, which can react with the hydroxyl groups of cotton fibers and the amino groups of nylon fibers in the nylon-cotton blended fabric to cross-link the active epoxy groups, thereby grafting the active epoxy groups onto the nylon-cotton blended fabric, so that the surface of the nylon-cotton blended fabric is rich in active epoxy groups; then, the nylon-cotton blended fabric is modified using tetrakis(hydroxymethyl)phosphonium chloride urea precondensate and 3-aminopropyltriethoxysilane; on the one hand, The amino or imino groups in the tetrakis(hydroxymethyl)phosphonium chloride urea precondensate can react covalently with the epoxy groups on the surface of the nylon-cotton blended fabric, thereby grafting the tetrakis(hydroxymethyl)phosphonium chloride urea precondensate onto the nylon-cotton blended fabric through covalent bonds; on the other hand, 3-aminopropyltriethoxysilane can react with the remaining hydroxymethyl groups of the tetrakis(hydroxymethyl)phosphonium chloride urea precondensate on the nylon-cotton blended fabric, thereby generating silica particles on the surface of the modified nylon-cotton blended fabric, reducing the water solubility of the tetrakis(hydroxymethyl)phosphonium chloride urea precondensate, and further improving the flame retardant efficiency and durability of the coated nylon-cotton blended fabric.

[0024] (2) The tetrakis(hydroxymethyl)phosphonium chloride urea precondensate in the multifunctional nylon-cotton blended fabric described in the present invention can improve the flame retardant properties of the nylon-cotton blended fabric by means of the phosphorus / nitrogen synergistic flame retardant effect, and has high flame retardant efficiency. In addition, octaepoxycyclohexylethyl caged polysilsesquioxane and silica can play a synergistic flame retardant effect, have high thermal stability, and help to suppress the smoke release performance of the flame-retardant nylon-cotton blended fabric. Therefore, the flame-retardant nylon-cotton blended fabric has high flame retardant properties, smoke suppression properties and water washability. DETAILED DESCRIPTION

[0025] The present invention will be further described below with reference to specific embodiments so that those skilled in the art can better understand and implement the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. It should be understood that the specific embodiments are only used to illustrate the present invention, and the embodiments are not intended to limit the present invention.

[0026] In the present invention, unless otherwise defined, technical and scientific terms used herein have the same meanings as commonly understood by one skilled in the art to which the present invention belongs.

[0027] In the present invention, unless stated otherwise, the term "and / or" used in the present invention includes any and all combinations of one or more of the associated listed items.

[0028] In the present invention, unless otherwise stated, the experimental methods used in the examples of the present invention are conventional methods unless otherwise stated, and the materials, reagents, etc. used are all commercially available unless otherwise stated.

[0029] In the present invention, unless otherwise specified, the padding and baking process used in the embodiments of the present invention is to first immerse the fabric in a finishing solution, then take it out and remove excess water from the fabric using a small padder, and then dry and bake it.

[0030] In the present invention, unless otherwise specified, the nylon / cotton blended fabric used in the embodiments of the present invention is a nylon / cotton 35 / 65 blended fabric with a gram weight of about 150g / m 2 .

[0031] Example 1

[0032] The multifunctional nylon-cotton blended fabric and the preparation method thereof of the present invention specifically comprise the following steps:

[0033] S1. Dissolving octaepoxycyclohexylethyl caged polysilsesquioxane in chloroform to obtain an octaepoxycyclohexylethyl caged polysilsesquioxane finishing solution having an octaepoxycyclohexylethyl caged polysilsesquioxane concentration of 60 g / L; performing a padding and baking treatment on a nylon-cotton blended fabric using the octaepoxycyclohexylethyl caged polysilsesquioxane finishing solution to obtain a once-finished nylon-cotton blended fabric; wherein the padding and baking treatment comprises an immersion time of 8 min, a padding rate of 95%, a drying temperature of 95° C., a drying time of 1.5 min, a baking temperature of 155° C., and a baking time of 2.5 min.

[0034] S2, dissolving tetrakis(hydroxymethyl)phosphonium chloride urea precondensate in water to obtain a tetrakis(hydroxymethyl)phosphonium chloride urea precondensate finishing solution having a tetrakis(hydroxymethyl)phosphonium chloride urea precondensate concentration of 155 g / L; performing a padding and baking treatment on the primary finished nylon-cotton blended fabric using the tetrakis(hydroxymethyl)phosphonium chloride urea precondensate finishing solution to obtain a secondary finished nylon-cotton blended fabric; wherein the padding and baking treatment has an immersion time of 8 min, a padding rate of 95%, a drying temperature of 85° C., a drying time of 2.5 min, a baking temperature of 155° C., and a baking time of 2.5 min;

[0035] S3. Dissolve 3-aminopropyltriethoxysilane in ethanol to obtain a 3-aminopropyltriethoxysilane finishing solution with a 3-aminopropyltriethoxysilane concentration of 50 g / L; use the 3-aminopropyltriethoxysilane finishing solution to perform a padding and baking treatment on the secondary finished nylon-cotton blended fabric to obtain a multifunctional nylon-cotton blended fabric; wherein, the immersion time of the padding and baking treatment is 8 minutes, the padding rate is 95%, the drying temperature is 85°C, the drying time is 2.5 minutes, the baking temperature is 155°C, and the baking time is 2.5 minutes.

[0036] Example 2

[0037] The multifunctional nylon-cotton blended fabric and the preparation method thereof of the present invention specifically comprise the following steps:

[0038] S1. Dissolving octaepoxycyclohexylethyl caged polysilsesquioxane in chloroform to obtain an octaepoxycyclohexylethyl caged polysilsesquioxane finishing solution having an octaepoxycyclohexylethyl caged polysilsesquioxane concentration of 50 g / L; performing a padding and baking treatment on a nylon-cotton blended fabric using the octaepoxycyclohexylethyl caged polysilsesquioxane finishing solution to obtain a once-finished nylon-cotton blended fabric; wherein the padding and baking treatment comprises an immersion time of 10 min, a padding rate of 100%, a drying temperature of 90° C., a drying time of 2 min, a baking temperature of 150° C., and a baking time of 3 min.

[0039] S2, dissolving tetrakis(hydroxymethyl)phosphonium chloride urea precondensate in water to obtain a tetrakis(hydroxymethyl)phosphonium chloride urea precondensate finishing solution having a tetrakis(hydroxymethyl)phosphonium chloride urea precondensate concentration of 130 g / L; performing a padding and baking treatment on the primary finished nylon-cotton blended fabric using the tetrakis(hydroxymethyl)phosphonium chloride urea precondensate finishing solution to obtain a secondary finished nylon-cotton blended fabric; wherein the padding and baking treatment has an immersion time of 10 min, a padding rate of 100%, a drying temperature of 80° C., a drying time of 3 min, a baking temperature of 150° C., and a baking time of 3 min;

[0040] S3. Dissolve 3-aminopropyltriethoxysilane in ethanol to obtain a 3-aminopropyltriethoxysilane finishing solution with a 3-aminopropyltriethoxysilane concentration of 40 g / L; use the 3-aminopropyltriethoxysilane finishing solution to perform a roll-baking treatment on the secondary finished nylon-cotton blended fabric to obtain a multifunctional nylon-cotton blended fabric; wherein, the immersion time of the roll-baking treatment is 10 minutes, the roll-baking rate is 100%, the drying temperature is 80°C, the drying time is 3 minutes, the baking temperature is 150°C, and the baking time is 3 minutes.

[0041] Example 3

[0042] The multifunctional nylon-cotton blended fabric and the preparation method thereof of the present invention specifically comprise the following steps:

[0043] S1. Dissolving octaepoxycyclohexylethyl caged polysilsesquioxane in chloroform to obtain an octaepoxycyclohexylethyl caged polysilsesquioxane finishing solution having an octaepoxycyclohexylethyl caged polysilsesquioxane concentration of 70 g / L; performing a padding and baking treatment on a nylon-cotton blended fabric using the octaepoxycyclohexylethyl caged polysilsesquioxane finishing solution to obtain a once-finished nylon-cotton blended fabric; wherein the padding and baking treatment comprises an immersion time of 5 min, a padding rate of 90%, a drying temperature of 100° C., a drying time of 1 min, a baking temperature of 160° C., and a baking time of 2 min.

[0044] S2, dissolving tetrakis(hydroxymethyl)phosphonium chloride urea precondensate in water to obtain a tetrakis(hydroxymethyl)phosphonium chloride urea precondensate finishing solution having a tetrakis(hydroxymethyl)phosphonium chloride urea precondensate concentration of 180 g / L; performing a padding and baking treatment on the primary finished nylon-cotton blended fabric using the tetrakis(hydroxymethyl)phosphonium chloride urea precondensate finishing solution to obtain a secondary finished nylon-cotton blended fabric; wherein the padding and baking treatment has an immersion time of 5 min, a padding rate of 90%, a drying temperature of 90° C., a drying time of 2 min, a baking temperature of 160° C., and a baking time of 2 min;

[0045] S3. Dissolve 3-aminopropyltriethoxysilane in ethanol to obtain a 3-aminopropyltriethoxysilane finishing solution with a 3-aminopropyltriethoxysilane concentration of 60 g / L; use the 3-aminopropyltriethoxysilane finishing solution to perform a padding and baking treatment on the secondary finished nylon-cotton blended fabric to obtain a multifunctional nylon-cotton blended fabric; wherein, the immersion time of the padding and baking treatment is 5 minutes, the padding rate is 90%, the drying temperature is 90°C, the drying time is 2 minutes, the baking temperature is 160°C, and the baking time is 2 minutes.

[0046] Comparative Example 1

[0047] The method is basically the same as Example 1, except that octaepoxycyclohexylethyl caged polysilsesquioxane is replaced with caged polysilsesquioxane.

[0048] Comparative Example 2

[0049] The method is basically the same as Example 1, except that octa-epoxycyclohexylethyl caged polysilsesquioxane is replaced with 2-(3,4-epoxycyclohexane)ethyltrimethoxysilane.

[0050] Comparative Example 3

[0051] The method is basically the same as Example 1, except that the octaepoxycyclohexylethyl caged polysilsesquioxane finishing liquid is not used.

[0052] Comparative Example 4

[0053] The process is basically the same as Example 1, except that the tetrakis(hydroxymethyl)phosphonium chloride urea precondensate is replaced by N-hydroxymethyl-3-(dimethoxyphosphonyl)propionamide.

[0054] Comparative Example 5

[0055] The method is basically the same as Example 1, except that the tetrakis(hydroxymethyl)phosphonium chloride urea precondensate finishing liquid is not used.

[0056] Comparative Example 6

[0057] The process is basically the same as Example 1, except that 3-aminopropyltriethoxysilane is replaced with tetraethyl orthosilicate.

[0058] Comparative Example 7

[0059] The method is basically the same as Example 1, except that 3-aminopropyltriethoxysilane finishing liquid is not used for finishing.

[0060] Comparative Example 8

[0061] The method is basically the same as Example 1, except that octaepoxycyclohexylethyl caged polysilsesquioxane, tetrakishydroxymethylphosphonium chloride urea precondensate, and 3-aminopropyltriethoxysilane are dissolved in a mixed solvent (chloroform, ethanol, and water in a volume ratio of 2:1:1) to obtain a composite finishing solution.

[0062] Comparative Example 9

[0063] The method is basically the same as Example 1, except that only the tetrakis(hydroxymethyl)phosphonium chloride urea precondensate finishing liquid is used for finishing.

[0064] Test Example 1

[0065] The flame retardant properties of the multifunctional nylon-cotton blended fabrics (modified nylon-cotton blended fabrics) and the unmodified nylon-cotton blended fabrics prepared in Examples 1-3 and Comparative Examples 1-9 were tested:

[0066] Limiting oxygen index (LOI) of fabric: measured in accordance with GB / T 5454-1997 "Textile combustion performance test oxygen index method";

[0067] Fabric damage length: measured in accordance with GB / T 5455-2014 "Fire performance of textiles - Determination of damage length in vertical direction - Smoldering and afterflaming time";

[0068] Fabric combustion performance: measured in accordance with the standard GB / T 17591-2006 "Flame Retardant Fabrics";

[0069] Total smoke generation of fabric: tested using cone calorimeter with a heat flux of 35kW / m 2 ;

[0070] Fabric washing method: Wash according to the standard of AATCC 61-2006 "Accelerated Test for Color Fastness to Washing for Household and Commercial Use".

[0071] Table 1 shows the final measured properties of the modified nylon-cotton blended fabric and the unmodified nylon-cotton blended fabric:

[0072] Table 1

[0073]

[0074] As can be seen from Table 1, the limiting oxygen index of the modified nylon-cotton blended fabric is not less than 30.0%, the damaged length is not higher than 10.7 cm, and the total amount of smoke released is not higher than 0.54 m 2 , reaching flame retardant B1 level; after 40 washes, the damaged length is still less than 14.7cm, reaching flame retardant B1 level, with excellent flame retardant properties, smoke suppression properties and water washability.

[0075] By comparing Example 1 and Comparative Example 1, it can be seen that when octaepoxycyclohexylethyl caged polysilsesquioxane is replaced with caged polysilsesquioxane, the flame retardant properties, smoke suppression properties and water wash resistance of the modified nylon-cotton blended fabric are all reduced. This is because the caged polysilsesquioxane cannot undergo a cross-linking reaction with the tetrakis(hydroxymethyl)phosphonium chloride urea precondensate, and therefore the silica particles generated by the tetrakis(hydroxymethyl)phosphonium chloride urea precondensate and 3-aminopropyltriethoxysilane are simply deposited on the nylon-cotton blended fabric.

[0076] By comparing Example 1 and Comparative Example 2, it can be seen that when octaepoxycyclohexylethyl caged polysilsesquioxane is replaced with 2-(3,4-epoxycyclohexane)ethyltrimethoxysilane, the flame retardant properties, smoke suppression properties and wash resistance of the modified nylon-cotton blended fabric are all reduced. This is because 2-(3,4-epoxycyclohexane)ethyltrimethoxysilane contains only one active epoxy group, which cannot react with the tetrakis(hydroxymethyl)phosphonium chloride urea precondensate to undergo a cross-linking reaction after reacting with the fabric. Therefore, the silica particles generated by the tetrakis(hydroxymethyl)phosphonium chloride urea precondensate and 3-aminopropyltriethoxysilane are simply deposited on the nylon-cotton blended fabric.

[0077] By comparing Example 1 and Comparative Example 3, it can be seen that when the octaepoxycyclohexylethyl caged polysilsesquioxane finishing liquid is not used, the flame retardant properties, smoke suppression properties and water wash resistance of the modified nylon-cotton blended fabric are all reduced. This is because the silica particles generated by the tetrakishydroxymethylphosphonium chloride urea precondensate and 3-aminopropyltriethoxysilane are simply deposited on the nylon-cotton blended fabric.

[0078] By comparing Example 1 and Comparative Example 4, it can be seen that when the tetrakis(hydroxymethyl)phosphonium chloride urea precondensate is replaced by N-hydroxymethyl-3-(dimethoxyphosphonyl)propionamide, the flame retardant properties, smoke suppression properties and water wash resistance of the modified nylon-cotton blended fabric are all reduced. This is because N-hydroxymethyl-3-(dimethoxyphosphonyl)propionamide contains a small amount of hydroxyl groups on its surface. Although it can react with the epoxy groups of octaepoxycyclohexylethyl caged polysilsesquioxane, its efficiency is low, and N-hydroxymethyl-3-(dimethoxyphosphonyl)propionamide cannot react with 3-aminopropyltriethoxysilane.

[0079] By comparing Example 1 and Comparative Example 5, it can be seen that when the tetrakis(hydroxymethyl)phosphonium chloride urea precondensate finishing liquid is not used, the flame retardant properties, smoke suppression properties and water wash resistance of the modified nylon-cotton blended fabric are significantly reduced. This is because the flame retardant efficiency of octaepoxycyclohexylethyl caged polysilsesquioxane and 3-aminopropyltriethoxysilane is relatively low.

[0080] By comparing Example 1 and Comparative Example 6, it can be seen that when 3-aminopropyltriethoxysilane is replaced with tetraethyl orthosilicate, the flame retardant properties, smoke suppression properties and water wash resistance of the modified nylon-cotton blended fabric are all reduced. This is because tetraethyl orthosilicate cannot react with tetrakis(hydroxymethyl)phosphonium chloride urea precondensate, and the silica particles formed by its hydrolysis are simply deposited on the nylon-cotton blended fabric, which cannot reduce the water solubility of tetrakis(hydroxymethyl)phosphonium chloride urea precondensate.

[0081] By comparing Example 1 and Comparative Example 7, it can be seen that when the 3-aminopropyltriethoxysilane finishing liquid is not used, the flame retardant properties, smoke suppression properties and water wash resistance of the modified nylon-cotton blended fabric are all reduced. This is because the water solubility of the tetrakis(hydroxymethyl)phosphonium chloride urea precondensate cannot be reduced.

[0082] By comparing Example 1 and Comparative Example 8, it can be seen that when the nylon-cotton blended fabric is modified simultaneously with octaepoxycyclohexylethyl caged polysilsesquioxane, tetrakishydroxymethylphosphonium chloride urea precondensate, and 3-aminopropyltriethoxysilane, the flame retardant properties, smoke suppression properties, and water wash resistance of the modified nylon-cotton blended fabric are all reduced. This is because the three react with each other on the surface of the nylon-cotton blended fabric to produce deposition, resulting in poor uniformity of the flame retardant coating on the fabric surface and a reduced degree of crosslinking with the nylon-cotton blended fabric.

[0083] Comparison of Example 1 and Comparative Example 9 reveals that the flame retardancy, smoke suppression, and washability of the modified nylon-cotton blended fabric decreased when treated solely with a tetrakis(hydroxymethyl)phosphonium chloride urea precondensate finishing solution. The nylon-cotton blended fabric contains very few amino groups, and the hydroxymethyl groups in the condensation product of tetrakis(hydroxymethyl)phosphonium chloride and urea are unable to react with the hydroxyl groups in the nylon-cotton blended fabric. Furthermore, its high water solubility makes it difficult to graft onto the nylon-cotton blended fabric, resulting in poor washability of the flame-retardant nylon-cotton blended fabric. Furthermore, the smoke emission of the nylon-cotton blended fabric modified solely with tetrakis(hydroxymethyl)phosphonium chloride urea precondensate was higher than that of the untreated nylon-cotton blended fabric, significantly reducing its fire safety.

[0084] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A method for preparing a multifunctional nylon-cotton blended fabric, characterized in that: The following steps are involved: S1, dissolving octaepoxycyclohexylethyl caged polysilsesquioxane in a first solvent to obtain an octaepoxycyclohexylethyl caged polysilsesquioxane finishing solution; performing a padding and baking treatment on a nylon-cotton blended fabric using the octaepoxycyclohexylethyl caged polysilsesquioxane finishing solution to obtain a primary-finished nylon-cotton blended fabric; S2, dissolving the tetrakis(hydroxymethyl)phosphonium chloride urea precondensate in water to obtain a tetrakis(hydroxymethyl)phosphonium chloride urea precondensate finishing liquid; The primary-finished nylon-cotton blended fabric is subjected to a padding and baking treatment using a tetrakis(hydroxymethyl)phosphonium chloride urea precondensate finishing liquid to obtain a secondary-finished nylon-cotton blended fabric. S3. Dissolving 3-aminopropyltriethoxysilane in a second solvent to obtain a 3-aminopropyltriethoxysilane finishing solution; and performing a padding and baking treatment on the secondary finished nylon-cotton blended fabric using the 3-aminopropyltriethoxysilane finishing solution to obtain the multifunctional nylon-cotton blended fabric.

2. The method for preparing the multifunctional nylon-cotton blended fabric according to claim 1, characterized in that: In S1, the concentration of octaepoxycyclohexylethyl caged polysilsesquioxane in the octaepoxycyclohexylethyl caged polysilsesquioxane finishing liquid is 50 g / L-70 g / L.

3. The method for preparing the multifunctional nylon-cotton blended fabric according to claim 1, characterized in that: In S1, the immersion time of the roll baking treatment is 5 min-10 min, the roll-off rate is 90%-100%, the drying temperature is 90°C-100°C, the drying time is 1 min-2 min, the baking temperature is 150°C-160°C, and the baking time is 2 min-3 min.

4. The method for preparing the multifunctional nylon-cotton blended fabric according to claim 1, characterized in that: In S1, the first solvent is chloroform.

5. The method for preparing the multifunctional nylon-cotton blended fabric according to claim 1, characterized in that: In S2, the concentration of the tetrakis(hydroxymethyl)phosphonium chloride-urea precondensate in the tetrakis(hydroxymethyl)phosphonium chloride-urea precondensate finishing liquid is 130 g / L-180 g / L.

6. The method for preparing the multifunctional nylon-cotton blended fabric according to claim 1, characterized in that: In S2, the immersion time of the roll baking treatment is 5 min-10 min, the roll-out rate is 90%-100%, the drying temperature is 80°C-90°C, the drying time is 2 min-3 min, the baking temperature is 150°C-160°C, and the baking time is 2 min-3 min.

7. The method for preparing the multifunctional nylon-cotton blended fabric according to claim 1, characterized in that: In S3, the concentration of 3-aminopropyltriethoxysilane in the 3-aminopropyltriethoxysilane finishing liquid is 40 g / L-60 g / L.

8. The method for preparing the multifunctional nylon-cotton blended fabric according to claim 1, characterized in that: In S3, the immersion time of the roll baking treatment is 5 min-10 min, the roll-off rate is 90%-100%, the drying temperature is 80°C-90°C, the drying time is 2 min-3 min, the baking temperature is 150°C-160°C, and the baking time is 2 min-3 min.

9. The method for preparing the multifunctional nylon-cotton blended fabric according to claim 1, characterized in that: In S3, the second solvent is ethanol.

10. A multifunctional nylon-cotton blended fabric prepared by the method according to any one of claims 1 to 9.

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