Yarn layered type efficient flame-retardant fabric and preparation method thereof

Abstract

The invention discloses a yarn layered type efficient flame-retardant fabric and a preparation method thereof, and particularly relates to a modified flame-retardant polyester fiber yarn prepared from cashew nut shells, a polyborosilazane flame retardant and other additives with an efficient flame-retardant effect. According to the flame-retardant fabric, the flame-retardant blended yarn and the pure flame-retardant yarn serve as the weft yarn, layered weft double structure organization construction is conducted, different types of flame-retardant fibers are matched, layered design is adopted, and a multi-component synergistic effect flame-retardant structure mode is formed, so that the flame-retardant requirement is met, and the flame-retardant effect is achieved. And compared with the direct use of a single fabric layer, the flame-retardant effect is better. A polyborosilazane flame retardant is used in the modified flame-retardant polyester fiber, so that the modified flame-retardant polyester fiber also has a smoke suppression effect; the cashew nut shells have obvious assistance on the flame-retardant effect; the p-aminobenzene sulfonyl guanidine also contains active amino and benzenesulfonyl groups, and can form hydrogen bonds with the activated polyester chips, cashew shells and the like, so that the stability of the modified flame-retardant polyester fiber is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of flame-retardant fabric preparation, and in particular relates to a yarn layered high-efficiency flame-retardant fabric and a preparation method thereof. Background Art

[0002] In recent years, the number of fires caused by textiles in various countries around the world has been on the rise. These fires not only seriously threaten people's lives and safety, but also cause huge losses to the economic development of society, and even bring irreparable tragic consequences. The reason is that a large number of flammable textiles widely used in work and living environments are one of the important causes. Especially in places such as residences, hotels, transportation and public places, the widespread use of flammable textiles increases the risk of fire. According to statistics, fires caused by textiles lacking flame retardant properties or insufficient flame retardancy account for more than 50% of the total number of fires. This data shows that the flame retardant properties of textiles play a vital role in reducing fire risks and reducing fire losses.

[0003] Flame-retardant textiles are functional textiles that enhance the fire resistance of fibers through chemical treatment or material modification. They can effectively prevent the spread of flames, reduce the burning rate, and buy precious time for personnel evacuation and fire extinguishing. At present, the production of flame-retardant textiles on the market mainly adopts two technical paths: one is to add flame retardants to the fiber surface for post-finishing treatment, and the other is to introduce flame-retardant chemical structures during the fiber production process to make it inherently flame-retardant. The application of these technologies has improved the flame retardant properties of textiles to a certain extent, helping to prevent fires and mitigate the consequences of fires. However, the development of existing flame-retardant textile technology still faces many challenges.

[0004] First, the flame retardant properties of existing flame retardant fabrics still need to be improved. In actual fires, the flame retardant effects of some flame retardant textiles are insufficient and cannot fully meet the strict requirements for protective performance in high-risk scenarios. Some flame retardant treatments can only suppress flames for a short period of time, but cannot significantly delay the further spread of the fire.

[0005] Secondly, certain flame retardant treatments may change the softness, breathability and skin-friendliness of the fiber, thus affecting the user's wearing experience, especially in occasions where comfort is required, such as clothing and household items. In addition, the addition of flame retardants may reduce the washability and durability of textiles, requiring frequent replacement, thereby increasing the economic burden on consumers.

[0006] In addition, some flame retardants may have adverse effects on the environment and human health during production and use. Some traditional flame retardants contain toxic or difficult-to-degrade chemicals, which may release harmful substances during the use or disposal of textiles, causing environmental pollution or health risks. This defect not only limits the scope of use of flame-retardant textiles, but also poses a challenge to sustainable development.

[0007] Finally, the high cost of existing flame-retardant textiles has hindered their widespread popularity in the mass market. Some high-efficiency flame-retardant materials are expensive due to expensive raw materials or complex production processes, which makes them unaffordable for many consumers and companies, thus limiting the promotion of flame-retardant textiles.

[0008] Therefore, although existing technologies have significantly improved the flame retardant properties of textiles, there is still a certain gap to fully meet the comprehensive requirements of safety, comfort, environmental protection and economy. Future research and technological innovation need to pay more attention to versatility and sustainability, and develop efficient, environmentally friendly and economical flame retardant textiles by optimizing materials and processes, so as to better serve human safety needs and improve the quality of life. Summary of the invention

[0009] In view of the deficiencies in the prior art, the first object of the present invention is to provide a yarn-layered high-efficiency flame-retardant fabric. On the basis of achieving the flame retardancy of the fabric, a double-weft fabric structure with layered flame-retardant yarns is adopted to further improve the flame retardancy of the fabric.

[0010] To achieve the above object, the present invention proposes the following technical solutions: A yarn layered high-efficiency flame-retardant fabric is woven from warp yarns and weft yarns, wherein the weft yarns include inner wefts and outer wefts, and the outer wefts and inner wefts are double wefts of each other, and the warp yarns, outer wefts and inner wefts form a double weft structure.

[0011] The warp yarn is twisted by a number of modified flame-retardant polyester fibers, the surface weft is a flame-retardant blended yarn, and the inner weft is a pure flame-retardant yarn; The modified flame-retardant polyester fiber comprises the following raw material components by weight: Polyester chips 100 pieces; 30-45 parts cashew nut shells; 10-15 parts of polysilicon boroxane flame retardant; 1-5 parts of anti-dripping agent; 0.5-1.5 parts of p-aminobenzenesulfonylguanidine.

[0012] On the basis of the above scheme and as a preferred scheme of the above scheme, in the double weft structure, the warp density is 300-350 yarns / 10cm, the weft density is 630-680 yarns / 10cm, and the surface weft and the inner weft each account for half of the yarn number.

[0013] On the basis of the above scheme and as a preferred scheme of the above scheme, the mass ratio of the warp yarn, the surface weft and the inner weft is 1:(1-1.5):(1-1.5).

[0014] On the basis of the above scheme and as a preferred scheme of the above scheme, the flame-retardant blended yarn is obtained by blending meta-aramid and flame-retardant polyester, wherein the blending ratio is 66.1:33.9.

[0015] On the basis of the above scheme and as a preferred scheme of the above scheme, the pure spun flame retardant yarn is one of flame retardant lyocell fiber yarn, flame retardant polyester yarn, flame retardant nylon yarn and flame retardant viscose yarn.

[0016] On the basis of the above scheme and as a preferred scheme of the above scheme, the moisture content of the cashew nut shell is below 8wt%.

[0017] On the basis of the above scheme and as a preferred scheme of the above scheme, the anti-dripping agent is coated polytetrafluoroethylene.

[0018] A second object of the present invention is to provide a method for preparing the yarn layered high-efficiency flame-retardant fabric, comprising the following steps: S1. Material pretreatment and preparation The polyester slices and cashew nut shells are respectively immersed in a 0.5wt%-1.5wt% aminopropyl triethoxysilane aqueous solution, and after the immersion is completed, they are taken out and dried to obtain pre-treated polyester slices and pre-treated cashew nut shells; S2. Preparation of modified flame-retardant polyester pellets Pre-treated polyester chips, pre-treated cashew shells, polysilicon boroxane flame retardant, anti-dripping agent and p-aminobenzenesulfonylguanidine are mixed according to weight proportions, stirred and mixed evenly to obtain a premix; the premix is ​​melt-blended and extruded through a twin-screw extruder, towed, granulated and dried to prepare modified flame-retardant polyester pellets; S3. Preparation of modified flame-retardant polyester fiber The modified flame-retardant polyester pellets are heated and melted, ejected through a spinning hole, stretched, cooled, and collected to obtain modified flame-retardant polyester fibers; S4, double weft structure weaving The modified flame-retardant polyester fiber is twisted as the warp yarn, and the flame-retardant blended yarn is prepared as the surface weft and the pure flame-retardant yarn is prepared as the inner weft. The warp yarn, the surface weft and the inner weft are placed on a small weaving prototype machine for processing to obtain a yarn layered fabric. S5. Post-processing The yarn layered fabric is immersed in a flame retardant finishing liquid for high temperature treatment, and the treated polyester fabric is baked to obtain the yarn layered high-efficiency flame retardant fabric.

[0019] On the basis of the above scheme and as a preferred scheme of the above scheme, in step S1, the soaking time is 4-12 hours, the drying time is 0.5-6 hours, and the drying temperature is 60°C.

[0020] On the basis of the above scheme and as a preferred scheme of the above scheme, in step S2, the stirring rate is 300-500 rpm, the stirring temperature is 35-60° C., and the stirring time is 30-40 minutes.

[0021] On the basis of the above scheme and as a preferred scheme of the above scheme, in step S5, the flame retardant finishing liquid includes nano magnesium oxide flame retardant, the baking temperature is 180-190° C., and the baking time is 3-5 minutes.

[0022] On the basis of the above scheme and as a preferred scheme of the above scheme, in step S5, the high temperature treatment is specifically: placing in an infrared high temperature dyeing machine and heating to 120-140° C. for 30 minutes.

[0023] Compared with the prior art, the technical solution of the present invention has the following beneficial effects: The present invention discloses a yarn layered high-efficiency flame-retardant fabric and a preparation method thereof, specifically, a modified flame-retardant polyester fiber yarn prepared by using additives with high-efficiency flame-retardant effects such as cashew nut shells and polysilicon boroxane flame retardants, and flame-retardant blended yarns and pure spun flame-retardant yarns as weft yarns are constructed with a layered weft double structure organization, mainly using different types of flame-retardant fibers for coordination, and adopting a layered design to form a multi-component synergistic flame-retardant structure mode, which not only achieves the flame-retardant requirements, but also has a better flame-retardant effect than directly using a single fabric layer. The use of polysilicon boroxane flame retardants in the modified flame-retardant polyester fiber also has a smoke suppression effect; cashew nut shells significantly contribute to the flame-retardant effect; p-aminobenzenesulfonylguanidine also has relatively active amino and benzenesulfonyl groups, which can form hydrogen bonds with activated polyester slices, cashew nut shells, etc., thereby improving the stability of the modified flame-retardant polyester fiber. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which: Figure 1 is a schematic diagram of a weft double cross-sectional structure according to the present invention; Figure 2 It is a schematic diagram of the structure of the warp yarn of the present invention.

[0025] In the figure, 1, warp; 2, surface weft; 3, inner weft. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention clearer, the technical scheme of the present invention will be clearly and completely described below in combination with the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the described embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Unless otherwise defined, the technical terms or scientific terms used herein should be the common meanings understood by people with general skills in the field to which the present invention belongs.

[0027] The words "first", "second" and similar words used in the patent application specification and claims of the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, unless the context clearly indicates otherwise, the singular form of "a", "an" or "the" and other similar words do not indicate a quantitative limitation, but indicate the existence of at least one. "Include" or "comprise" and other similar words mean that the elements or objects appearing before "include" or "comprise" cover the features, wholes, steps, operations, elements and / or components listed after "include" or "comprise", and do not exclude the existence or addition of one or more other features, wholes, steps, operations, elements, components and / or their collections. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0028] like Figure 1 As shown, the present invention provides a yarn layered high-efficiency flame-retardant fabric, which is woven from warp yarns and weft yarns, wherein the weft yarns include warp yarns and surface wefts, the surface wefts and the inner wefts are double wefts, and the warp yarns, the surface wefts and the inner wefts form a double weft structure; The warp yarn is formed by twisting a number of modified flame-retardant polyester fibers (for example Figure 2 ), the surface weft is a flame retardant blended yarn; the inner weft is a pure flame retardant yarn.

[0029] Furthermore, the surface weft is a flame-retardant blended yarn, and the flame-retardant blended yarn is made of meta-aramid and flame-retardant polyester with a blending ratio of 66.1 / 33.9, wherein the meta-aramid is purchased from Yantai Taihe New Materials Co., Ltd., and the flame-retardant polyester is purchased from Sichuan Dongcai Technology Group Co., Ltd.

[0030] Furthermore, the warp yarn is twisted by a number of modified flame-retardant polyester fibers, and the modified flame-retardant polyester fibers include pre-treated polyester chips, pre-treated cashew shells, polysilicon boroxane flame retardants, anti-dripping agents, and p-aminobenzenesulfonylguanidine: the pre-treatment is performed to improve the surface activity of the material so that it is easy to mix and adhere with other materials; the cashew shells used are rich in cardanol, which is a mixture of phenol compounds containing four long alkyl chains with different degrees of unsaturation, usually containing 38wt% cardanol containing three olefin side chains, 17wt% cardanol containing two olefin side chains, 42wt% cardanol containing one olefin side chain and 3wt% cardanol with saturated alkyl side chains, and the molecular structure includes phenolic hydroxyl groups, benzene rings and long alkyl chains containing olefin structures, etc., which can provide multiple reaction sites with high chemical reactivity, can be combined with polyester chips in the form of chemical bonds, have a stable structure, and the steric effect generated by the benzene rings in the chemical structure can enhance its flame retardant properties. More importantly, in addition to cardanol, cashew shells also contain shell materials. Under the condition of continuous melting and blending, the shell materials contain cellulose, lignin and polyphenols, which can also enhance the flame retardant effect of the material. At the same time, the important characteristic groups of cashew shells that distinguish them from other natural bio-based resources can show good toughness.

[0031] Furthermore, the polysilicon boroxane flame retardant is a new type of high-efficiency, low-toxic, anti-drip, environmentally friendly halogen-free flame retardant, and is also a charring type smoke suppressant. In addition to imparting excellent flame retardant properties to the substrate, the polysilicon boroxane flame retardant can also improve the processing properties, heat resistance, etc. of the substrate. In the present invention, the polysilicon boroxane flame retardant is cross-linked by a reversible boron-oxygen (BO) bond between a polydimethylsiloxane precursor and boric acid, and the proportion of the elements boron, silicon and oxygen is 1: (1-3): (3-5). In order to better enhance the interfacial compatibility with the substrate, the polysilicon boroxane flame retardant is immersed in a 0.5wt%-2.5wt% graphene oxide aqueous solution, stirred for 6-8 hours, filtered and dried to obtain an interfacially modified polysilicon boroxane flame retardant. Graphene oxide is coated on the surface of the flame retardant. The surface of graphene oxide contains rich hydroxyl, carboxyl, oxygen-containing groups and a large specific surface area. It has good amphiphilicity and can enhance the interfacial compatibility between the filler and the matrix, thereby enhancing the mechanical properties of the fiber. The graphene oxide aqueous solution at this ratio can well ensure that it is coated on the surface of the flame retardant material, and ensures the interfacial bonding effect between the material and the matrix. Furthermore, the anti-dripping agent is purchased from Dongguan Dingxin Plastic Raw Materials Co., Ltd. MP-30. MP-30 is a specially modified coated polytetrafluoroethylene with the advantages of heat resistance, good processing fluidity, and no filamentation, which can improve the flame retardant grade. The anti-dripping agent plays a flame retardant and anti-dripping role, helping polyester fibers to reach higher flame retardant standards, and is a flame retardant and anti-dripping additive with excellent processing performance and excellent surface properties. At the same time, it can increase the melt strength of the polymer and the anti-collapse property of the product.

[0032] Generally, p-aminobenzenesulfonylguanidine has anti-inflammatory and antibacterial effects in the medical field. In the present invention, according to its chemical structure, the aromatic primary amino group in its reducing molecule is easily oxidized. For the fiber as a whole, p-aminobenzenesulfonylguanidine can consume more oxygen, thereby ensuring the antioxidant properties of the fiber; p-aminobenzenesulfonylguanidine also has relatively active amino and benzenesulfonyl groups, which can form hydrogen bonds with activated polyester chips, cashew shells, etc., thereby improving the stability of the modified flame-retardant polyester fiber. If a fire occurs, under the same conditions, the fiber material added with p-aminobenzenesulfonylguanidine will consume more oxygen in the same area, thereby enhancing the oxygen index of the material.

[0033] The pure spun flame retardant yarn of the present invention is a flame retardant lyocell fiber yarn to improve the comfort of the fabric. Furthermore, after the fabric is completed, it will be flame retardantly finished to improve the flame retardant effect of the material.

[0034] In the embodiment of the present invention, the flame retardant fabric obtained was tested for performance using the following method: ①Main physical properties test of textiles For specific test methods, refer to GB / T 4669-2008 "Textiles - Determination of mass per unit length and mass per unit area"; GB / T 3923.1-2013 "Tensile properties of textile fabrics - Part 1: Determination of breaking strength and elongation at break (Strip method)"; and GB / T 3917.3-2009 "Tear properties of textile fabrics - Part 3: Determination of tear strength of trapezoidal test specimens". The obtained indicators are the average values ​​of 3 sub-samples.

[0035] ② Damage length, smoldering and afterburning time The samples to be tested were cut into specified sizes and tested for damage length, smoldering time and afterflame time according to GB / T 5455-2014 "Determination of vertical damage length, smoldering time and afterflame time of textiles". Since the fabric samples were processed by a small prototype machine and the warp length was limited, only the weft direction was tested for flame retardancy, and the indicators obtained were the average values ​​of the three sub-samples.

[0036] ③Flame retardant grade The flame retardant grade is assessed in accordance with GB / T 17591-2006 "Flame Retardant Fabrics".

[0037] ④Total amount of smoke released The total smoke release of the samples was tested and characterized using a VOUCH 6810 cone calorimeter in accordance with the ISO 5660-1 standard.

[0038] The present invention is further described below in conjunction with specific embodiments. It should be understood that all combinations of the aforementioned concepts and the additional concepts described in more detail below can be considered as part of the subject disclosure of the present invention as long as such concepts do not contradict each other.

[0039] Examples 1-3 A yarn layered high-efficiency flame-retardant fabric is woven from warp yarn and weft yarn, wherein the warp yarn is twisted from 5 modified flame-retardant polyester fibers, the weft yarn includes a surface weft and an inner weft, the surface weft and the inner weft are double wefts, and the warp yarn, the surface weft and the inner weft are interwoven to form a double weft structure; the surface weft is a flame-retardant blended yarn; the inner weft is a pure flame-retardant yarn. The flame-retardant blended yarn is made of meta-aramid and flame-retardant polyester at a blending ratio of 66.1 / 33.9; the pure flame-retardant yarn is a flame-retardant lyocell fiber yarn.

[0040] The flame retardant fabric with double weft structure has a warp density of 300 threads / 10cm and a weft density of 632 threads / 10cm. The surface weft and the inner weft each account for half of the threads. The mass ratio of warp yarn / surface weft / inner weft is 1 / 1.05 / 1.05. The warp yarn accounts for 32.26wt%, the surface weft accounts for 33.87wt%, and the inner weft accounts for 33.87wt% of the fabric.

[0041] The modified flame-retardant polyester fiber comprises the following raw material components by weight: Polyester chips 100 pieces; 30-45 parts cashew nut shells; 10-15 parts of polysilicon boroxane flame retardant; 1-5 parts of anti-dripping agent; 0.5-1.5 parts of p-aminobenzenesulfonylguanidine.

[0042] The specific materials and proportions used in Examples 1-3 are shown in Table 1: Table 1 Ratio of raw materials used raw materials Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Comparative Example 6 Polyester chips 100 100 100 100 100 100 100 100 100 Cashew Shell 38 30 45 - 38 38 38 - - Polysilicon Boroxane Flame Retardant 13 10 15 13 - 13 13 - - Anti-drip agent 3 1 5 3 3 - 3 - - p-Aminobenzenesulfonylguanidine 1.1 0.5 1.5 1.1 1.1 1.1 - - - Strictly follow the following process flow to carry out the preparation: A method for preparing a yarn layered high-efficiency flame-retardant fabric comprises the following steps: S1. Material pretreatment and preparation The polyester chips and cashew nut shells were respectively immersed in a 1.2wt% aminopropyltriethoxysilane aqueous solution for 8 hours, and then placed in a blast drying oven at 60°C for 1 hour to obtain pre-treated polyester chips and pre-treated cashew nut shells; S2. Preparation of modified flame-retardant polyester pellets The pre-treated polyester chips, pre-treated cashew shells, polysilicon boroxane flame retardant, anti-dripping agent and p-aminobenzenesulfonylguanidine described in S1 are weighed according to the ratio, and mechanically stirred at 40° C. and 500 rpm for 40 minutes to obtain a premix; the premix is ​​melt-blended and extruded through a twin-screw extruder, towed, granulated and dried to obtain a modified flame-retardant polyester pellet; S3. Preparation of modified flame-retardant polyester fiber The S2 modified flame-retardant polyester pellets are heated and melted, and the molten modified flame-retardant polyester melt is ejected through a spinning hole, and is stretched, cooled, and collected to obtain a modified flame-retardant polyester fiber; S4, double weft structure weaving The modified flame-retardant polyester fiber is twisted into warp yarn according to a certain number of strands, and flame-retardant blended yarn is prepared as surface weft and pure flame-retardant yarn is prepared as inner weft. The warp yarn, surface weft and inner weft are placed on a small weaving prototype machine for processing to obtain a yarn layered fabric. S5. Post-processing The yarn layered fabric is immersed in a flame retardant finishing liquid, placed in an infrared high temperature dyeing machine and heated to 120° C. for 30 minutes, and the treated polyester fabric is baked to obtain the yarn layered high efficiency flame retardant fabric.

[0043] Comparative Examples 1-4 Different from Example 1, the raw materials are weighed according to the ratios in Table 1, and other processes and weaving methods refer to Example 1.

[0044] Comparative Example 5 Take the same type of polyester chips, refer to the process flow of Example 1, directly prepare polyester fibers, and take the same number of polyester fibers to twist into yarns as the warp yarns of this comparative example; the weft yarns of this comparative example include surface weft and inner weft, the surface weft uses flame-retardant blended yarn, the flame-retardant blended yarn is made of meta-aramid and flame-retardant polyester with a blending ratio of 66.1 / 33.9, and the inner weft uses pure flame-retardant yarn. The warp yarns, the surface wefts and the inner wefts are interwoven to form a double weft structure.

[0045] The post-treatment method of the textile is as in Example 1, and the test samples are prepared according to the test requirements. The relevant test comparison is shown in Table 2.

[0046] Comparative Example 6 Different from Comparative Example 5, polyester chips of the same type are taken, and polyester fibers are prepared according to the process flow of Reference Example 1, and the same number of strands of polyester fibers are twisted into yarns as the warp yarns of this comparative example. The weft yarns of this comparative example are formed by plying and twisting flame-retardant blended yarns and pure flame-retardant yarns, and the flame-retardant blended yarns are made of polyester fibers prepared in this comparative example and flame-retardant polyester at a blending ratio of 66.1 / 33.9; the warp and weft densities in this embodiment are the same as those in Example 1.

[0047] The test results of the above embodiments and comparative examples are shown in Table 2.

[0048] Table 2 Test results Fabric Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Comparative Example 6 <![CDATA[Grammage / (g / m 2 )]]> 271.0 273.5 274.6 271.9 273.5 274.0 275.1 273.9 274.5 Tensile breaking strength / N 2690 2671 2683 2258 2301 2387 2379 2197 2017 Tearing strength / N 267.5 263.5 264.0 184.2 197.3 241.9 207.1 169.3 152.4 Afterburning time / s 0 0 0 6.3 2.2 ＜1.0 ＜1.0 11.6 21.8 Smoldering time / s 0 0 0 ＜1 ＜1 ＜1 ＜1 2 5 Damaged length / mm 28 32 36 66 53 41 46 79 89 Flame retardant grade B1 B1 B1 B2 B2 B2 B2 B2 - <![CDATA[Total amount of smoke released / m 2 > 0.29 0.31 0.33 0.70 0.63 0.51 0.71 0.78 0.90 From the comparative results in Table 2 above, it can be seen that the cashew nut shell has a significant effect on the flame retardancy of textiles. This is because in addition to cardanol, cashew nut shells also contain cellulose, lignin and polyphenols in the shell material, which have a greater impact on the flame retardancy of textiles. Para-aminobenzenesulfonylguanidine will consume more oxygen in the same area. The absence of para-aminobenzenesulfonylguanidine will cause other materials to consume oxygen and produce smoke, etc. Therefore, the absence of para-aminobenzenesulfonylguanidine will cause a sharp increase in the amount of smoke released in the test area.

[0049] Comparison between Comparative Example 5 and Comparative Example 6 shows that the use of double weft weave not only produces better tensile strength and tear strength, but also improves the flame retardant properties of the fabric. Specifically, when the same type of flame retardant fibers are used at the same level, uniform materials are used at the yarn level and the fabric level, which will produce textiles with higher strength, and is the best condition for obtaining high-strength fabrics; under the condition that the overall composition of the fabric is the same, the different configurations of the flame retardant fibers in the hierarchical structure will lead to differences in flame retardant properties, and the layered double weft improves the flame retardant properties of the fabric, which provides a new and more cost-effective idea for flame retardancy: that is, under the same flame retardant requirements, ordinary fibers with general flame retardancy, low price, and high mechanical strength are used as substitutes.

[0050] Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. A person with ordinary knowledge in the technical field to which the present invention belongs may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be determined by the definition of the claims.

Claims

1. A yarn layered high-efficiency flame-retardant fabric, woven from warp yarns and weft yarns, characterized in that: The weft yarns include inner wefts and outer wefts, and the outer wefts and inner wefts are double wefts, and the warp yarns, outer wefts and inner wefts form a double weft structure; The warp yarn is twisted from modified flame-retardant polyester fibers, the surface weft is flame-retardant blended yarn, and the inner weft is pure flame-retardant yarn; The modified flame-retardant polyester fiber comprises the following raw material components by weight: Polyester chips 100 pieces; 30-45 parts cashew nut shells; 10-15 parts of polysilicon boroxane flame retardant; 1-5 parts of anti-dripping agent; 0.5-1.5 parts of p-aminobenzenesulfonylguanidine.

2. The yarn layered high-efficiency flame-retardant fabric according to claim 1, characterized in that: In the double weft structure, the warp density is 300-350 yarns / 10cm, the weft density is 630-680 yarns / 10cm, and the surface weft and the inner weft each account for half of the yarn number.

3. The yarn layered high-efficiency flame-retardant fabric according to claim 2, characterized in that: The mass ratio of the warp yarn, the surface weft and the inner weft is 1:(1-1.5):(1-1.5).

4. The yarn layered high-efficiency flame-retardant fabric according to claim 1, characterized in that: The water content of the cashew nut shell is below 8wt%.

5. The yarn layered high-efficiency flame-retardant fabric according to claim 1, characterized in that: The anti-dripping agent is coated polytetrafluoroethylene.

6. The yarn layered high-efficiency flame-retardant fabric according to claim 1, characterized in that: The flame-retardant blended yarn is obtained by blending meta-aramid and flame-retardant polyester; the pure spun flame-retardant yarn is one of flame-retardant lyocell fiber yarn, flame-retardant polyester yarn, flame-retardant nylon yarn and flame-retardant viscose yarn.

7. A method for preparing the yarn layered high-efficiency flame-retardant fabric according to any one of claims 1 to 6, characterized in that: The preparation method comprises the following steps: S1. Material pretreatment and preparation The polyester slices and cashew nut shells are respectively immersed in a 0.5wt%-1.5wt% aminopropyl triethoxysilane aqueous solution, and after the immersion is completed, they are taken out and dried to obtain pre-treated polyester slices and pre-treated cashew nut shells; S2. Preparation of modified flame-retardant polyester pellets Pre-treated polyester chips, pre-treated cashew shells, polysilicon boroxane flame retardant, anti-dripping agent and p-aminobenzenesulfonylguanidine are mixed according to weight proportions, stirred and mixed evenly to obtain a premix; the premix is ​​melt-blended and extruded through a twin-screw extruder, towed, granulated and dried to prepare modified flame-retardant polyester pellets; S3. Preparation of modified flame-retardant polyester fiber The modified flame-retardant polyester pellets are heated and melted, ejected through a spinning hole, stretched, cooled, and collected to obtain modified flame-retardant polyester fibers; S4, double weft structure weaving The modified flame-retardant polyester fiber is twisted as the warp yarn, and the flame-retardant blended yarn is prepared as the surface weft and the pure flame-retardant yarn is prepared as the inner weft. The warp yarn, the surface weft and the inner weft are placed on a small weaving prototype machine for processing to obtain a yarn layered fabric. S5. Post-processing The yarn layered fabric is immersed in a flame retardant finishing liquid, subjected to a high temperature treatment at 120-140°C, and the treated polyester fabric is baked to obtain the yarn layered high-efficiency flame retardant fabric.

8. The preparation method according to claim 7, characterized in that: In step S1, the soaking time is 4-12 hours, the drying time is 0.5-6 hours, and the drying temperature is 60°C.

9. The preparation method according to claim 7, characterized in that: In step S2, the stirring rate is 300-500 rpm, the stirring temperature is 35-60° C., and the stirring time is 30-40 minutes.

10. The preparation method according to claim 7, characterized in that: In step S5, the flame retardant finishing liquid includes nano magnesium oxide flame retardant, the baking temperature is 180-190° C., and the baking time is 3-5 minutes.

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