A flame-retardant waterproof fabric for luggage and a preparation method thereof

Abstract

The application discloses a kind of flame-retardant waterproof fabric for luggage and a preparation method thereof, and belongs to the technical field of garment fabric preparation.The preparation method comprises the following steps: after cleaning and impurity removal of the polyester fabric, drying, first flame-retardant finishing, one-time drying, one-time baking, waterproof finishing, then two-time drying, two-time baking treatment, and the flame-retardant waterproof fabric is obtained.The fabric obtained by the application has good flame-retardant and waterproof properties, and still maintains good performance after multiple washes.

Description

Technical Field

[0001] This invention belongs to the field of clothing fabric preparation technology, specifically relating to a flame-retardant and waterproof fabric for bags and its preparation method. Background Technology

[0002] Bags and suitcases are a general term for containers used to hold and carry items, including dozens of categories such as backpacks, handbags, suitcases, and briefcases. Their core functions are storage and portability, taking into account both practicality and decoration, and they are an important part of modern life and clothing culture. There are many types of fabrics used to make bags and suitcases, which can be divided into the following categories according to material characteristics and uses: (1) natural fabrics, such as leather fabrics (cowhide, sheepskin, pigskin, etc.), canvas (pure cotton or linen), linen (woven from hemp plant fibers), etc.; (2) synthetic fabrics, such as nylon, polyester, Oxford cloth, etc.; (3) special function fabrics, such as carbon fiber, polycarbonate, etc. Among them, polyester has the advantages of wrinkle resistance, corrosion resistance, and easy dyeing, and its cost is lower than that of nylon. It is often used in the production of outdoor products such as computer bags and suitcases. However, the use of outdoor products often requires facing a variety of environments, such as humid heat and high temperature. Improving the flame retardant and waterproof properties of the fabric is of great practical significance for improving the service life of bags and suitcases.

[0003] In the prior art, there have been some related reports. For example, patent document CN113152087A provides a waterproof and flame-retardant finishing agent and its finishing process for polyester fabric. Specifically, it provides a waterproof and flame-retardant finishing agent composed of 180-250 g / L phosphate ester flame retardant, 10-30 g / L acrylate emulsion ester waterproofing agent, and 10-30 g / L isocyanate crosslinking agent. By optimizing the ratio of the finishing agent and combining it with a suitable finishing process, the flame retardant performance of the finished polyester fabric meets the national standard, and the waterproof performance meets the US standard level 4. The waterproof and flame-retardant finishing agent provided in the above-mentioned document can play a certain role, but its long-term effect is not enough. After washing, its effectiveness is easily severely reduced.

[0004] For example, patent document CN113279262A provides a method for preparing flame-retardant and waterproof fabric, with the following steps: Step 1: Prepare a flame-retardant and waterproof functional finishing liquid according to the process formula; Step 2: Immerse the fabric in the flame-retardant and waterproof functional finishing liquid and roll it in; Step 3: Pre-dry and bake; The flame-retardant and waterproof functional finishing liquid is composed of a flame-retardant and waterproof functional finishing agent and water; The preparation of the flame-retardant and waterproof functional finishing agent includes two main steps: the preparation of terminal amino polysiloxane by acid ring opening and the preparation of phosphorus-containing polysiloxane, which involves the synthesis of polymers, the process is relatively complicated, and the flame-retardant performance needs to be further improved.

[0005] Therefore, it is desirable to propose the present invention. Summary of the Invention

[0006] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a flame-retardant and waterproof fabric for bags and a method for preparing the same. The resulting fabric has excellent flame-retardant and waterproof properties and maintains good performance even after multiple washes.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] In a first aspect, the present invention provides a method for preparing flame-retardant and waterproof fabric for bags, comprising the following steps: after cleaning and removing impurities from polyester fabric and drying it, flame-retardant finishing is performed first, followed by a drying and baking process and then waterproof finishing, and then a second drying and baking process is performed to obtain flame-retardant and waterproof fabric.

[0009] The flame-retardant finishing process involves immersing the polyester fabric in a flame-retardant finishing solution for 0.5–5 hours, followed by rolling. The preparation of the flame-retardant finishing solution includes the following steps:

[0010] S1. Pre-modification of vermiculite: Vermiculite raw material is added to hydrochloric acid solution, heated, filtered, washed, dried, ground and sieved to obtain pre-modified vermiculite;

[0011] S2. Modification of vermiculite: The pre-modified vermiculite obtained in step S1 is added to an aqueous solution of sodium trifluoroacetate for treatment. After treatment, it is filtered, washed, and dried to obtain pre-modified vermiculite. The obtained pre-modified vermiculite is added to a boric acid ethanol solution and then heated. After treatment, modified vermiculite is obtained.

[0012] S3. Modification of carbon nanotubes: Carbon nanotubes are placed in a mixed acid for treatment. After treatment, they are then filtered, washed, and dried to obtain modified carbon nanotubes.

[0013] S4. Add fatty alcohol polyoxyethylene ether to the raw lacquer, stir evenly, then add polyurethane emulsion, stir evenly again, then add the modified vermiculite obtained in step S2 and the modified nanotubes obtained in step S3, stir evenly again to obtain the flame retardant finishing liquid.

[0014] As a preferred embodiment of the technical solution of the present invention, in step S1, the concentration of hydrochloric acid solution is 0.1~0.25mol / L; the heating temperature is 40~55℃, the treatment time is 2~8h, the ratio of vermiculite to hydrochloric acid solution is 1g:5~12mL, and the sieve mesh size is 100~150 mesh.

[0015] As a preferred embodiment of the technical solution of the present invention, in step S2, the concentration of sodium trifluoroacetate aqueous solution is 4~8wt%, and the ratio of pre-modified vermiculite to sodium trifluoroacetate aqueous solution is 1g:4~8mL.

[0016] The pre-modified vermiculite was treated in a sodium trifluoroacetate aqueous solution at a temperature of 50-70℃ for 4-8 hours.

[0017] As a preferred embodiment of the technical solution of the present invention, in step S2, the concentration of boric acid ethanol solution is 0.05~0.15g / mL, and the ratio of the amount of pre-modified vermiculite to boric acid ethanol solution is 1g:15~25mL.

[0018] The preliminary modified vermiculite was heated in boric acid ethanol solution at a temperature of 55~70℃ for a time of 10~25 min.

[0019] As a preferred embodiment of the technical solution of the present invention, in step S3, the mixed acid is obtained by mixing concentrated sulfuric acid and concentrated nitric acid in a volume ratio of 1:3; the mass ratio of carbon nanotubes to mixed acid is 1:40~60; the treatment temperature is 55~75℃ and the treatment time is 2~6h.

[0020] As a preferred embodiment of the technical solution of the present invention, in step S4, the mass ratio of fatty alcohol polyoxyethylene ether, raw lacquer, polyurethane emulsion, modified vermiculite, and modified nanotubes is 1.5~2.5:100:20~30:3~12:0.8~2.

[0021] As a preferred embodiment of the technical solution of the present invention, the waterproof finishing process is as follows: the polyester fabric after one drying is placed in a waterproof finishing solution and immersed at 30~45℃ for 4~8 hours, followed by pressing.

[0022] The waterproof finishing liquid consists of: 1~4g of organic fluorine waterproofing agent, 0.5~1.5g of organic silicone finishing agent, and 100g of water.

[0023] As a preferred embodiment of the technical solution of the present invention, the primary drying temperature is 95℃ and the drying time is 3~6min; the primary baking temperature is 170~175℃ and the time is 1~3min.

[0024] The secondary drying temperature is 100℃ and the drying time is 1~5min; the secondary baking temperature is 160℃ and the time is 1~4min.

[0025] Secondly, the present invention seeks protection for the flame-retardant and waterproof fabric prepared by the above method.

[0026] Thirdly, the present invention aims to provide the application of the flame-retardant and waterproof fabric prepared above in clothing products, especially in the manufacture of bags.

[0027] Furthermore, this invention also claims protection for the fabric prepared by the above method.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] (1) The flame-retardant and waterproof fabric provided by the present invention adopts a secondary finishing process, and the fabric has excellent waterproof and flame-retardant properties, and maintains excellent performance after multiple washings.

[0030] (2) The method for preparing the flame-retardant and waterproof fabric provided by the present invention adopts the method of flame-retardant finishing first and then waterproof finishing. The reason is that if waterproof finishing is done first, the surface waterproof layer will hinder the penetration of flame retardant, resulting in a decrease in flame retardant effect; and the substances in the flame retardant may dissolve or damage the waterproof layer. Compared with the simultaneous flame retardant and waterproof finishing, the process of flame retardant finishing first and then waterproof finishing in the present invention can greatly improve the performance of the fabric. The reason is that the flame retardant effect of the flame retardant finishing liquid requires the components of the flame retardant finishing liquid to fully penetrate into the fabric fibers. The flame retardant finishing is done separately first to avoid the potential obstruction of penetration by the hydrophobic film of the waterproofing agent. In addition, if the finishing is done at the same time, the waterproofing agent and other polymers in the waterproof finishing liquid may encapsulate the components of the flame retardant finishing liquid, reducing the finishing effect.

[0031] (3) The method for preparing flame-retardant and waterproof fabric provided by the present invention uses raw lacquer and polyurethane emulsion as the main substances in the flame-retardant finishing liquid. On the one hand, the excellent flame-retardant properties of raw lacquer are fully utilized. Its rich group substances can be firmly combined with the fabric, ensuring the flame-retardant performance after washing. Moreover, the combined use with polyurethane emulsion ensures that the system is fully immersed in the gaps of the fabric. On the other hand, the addition of a small amount of polyurethane emulsion improves the film-forming properties of the finishing liquid system and the waterproof finishing liquid system. Therefore, the present invention controls the amount of raw lacquer to be more than that of polyurethane emulsion.

[0032] (4) The method for preparing flame-retardant and waterproof fabric provided by the present invention also uses vermiculite and carbon nanotubes as fillers in the flame-retardant finishing liquid to further improve the flame-retardant finishing effect. Both are good flame-retardant materials. The present invention has made corresponding treatments on both of them. Specifically: The present invention first pickles and cleans the vermiculite to initially expand the interlayer spacing and initially activate it. Then it is treated with sodium trifluoroacetate to further expand the interlayer spacing. At the same time, the introduction of fluorine improves the hydrophobicity of vermiculite and further improves the flame-retardant performance of vermiculite. It is also beneficial to the subsequent modification of boric acid and the composite of carbon nanotubes. Then, the vermiculite is modified with boric acid to further improve the flame-retardant performance of vermiculite and inhibit the high-temperature pulverization of vermiculite. The simultaneous modification of fluorine and boron greatly ensures the composite efficiency of carbon nanotubes and improves the dispersibility of vermiculite in the system. In order to improve the composite effect of carbon nanotubes, the present invention has made simple modification treatment on it. The introduced groups can well ensure its composite with modified vermiculite and its dispersion in raw lacquer and polyurethane emulsion.

[0033] (5) The method for preparing flame-retardant and waterproof fabric provided by the present invention uses a small amount of fatty alcohol polyoxyethylene ether to promote the emulsification and dispersion of the system and ensure the effectiveness of the system.

[0034] (6) The method for preparing flame-retardant and waterproof fabric provided by the present invention mainly uses existing mature waterproofing agents and finishing agents for waterproof finishing, and the effect is significant.

[0035] In summary, the present invention employs a two-stage finishing process to produce a flame-retardant and waterproof fabric with excellent flame-retardant and waterproof properties, making it suitable for the manufacture of outdoor bags. Detailed Implementation

[0036] The embodiments of the present invention are described in detail below. It should be emphasized that all embodiments shown are intended to explain the present invention and should not be construed as limiting the present invention.

[0037] Unless otherwise specified, all raw materials used in this invention were purchased through market channels. Specifically, vermiculite was purchased from Hebei Bordian New Material Technology Co., Ltd.; carbon nanotubes were purchased from Chengdu Organic Chemistry Co., Ltd., Chinese Academy of Sciences, Chengdu; fatty alcohol polyoxyethylene ether was purchased from Chengdu Kelong Chemical Reagent Factory; the polyurethane emulsion, Archsol 8408, was purchased from Wanhua Chemical Group Co., Ltd.; the organic fluorine waterproofing agent, TG-5601, was purchased from Daikin Fluorochemicals (China) Co., Ltd.; and the organosilicon finishing agent, Shinchem SF 9204, was purchased from Shanghai Fluoropoly Chemicals Co., Ltd.

[0038] Both flame-retardant and waterproof finishing processes are carried out using a one-dip-one-roll method. The roll residue rate for flame-retardant finishing is approximately 70%, while the roll residue rate for waterproof finishing is 60%. The implementation of the above processes is a general skill mastered by those skilled in the art, and is not specifically limited or described in this invention.

[0039] Example 1

[0040] A method for preparing a flame-retardant and waterproof fabric for bags includes the following steps: after cleaning and removing impurities from the polyester fabric and drying it, flame-retardant finishing is performed first, followed by drying (95℃, 4min) and baking (170℃, 2min) and then waterproof finishing, followed by drying (100℃, 3min) and baking (160℃, 2min) to obtain the flame-retardant and waterproof fabric.

[0041] The flame-retardant finishing process involves immersing the polyester fabric in a flame-retardant finishing solution for 2 hours, followed by rolling. The preparation of the flame-retardant finishing solution includes the following steps:

[0042] S1. Pre-modification of vermiculite: Vermiculite raw material was added to 0.15mol / L hydrochloric acid solution at a dosage ratio of 1g:10mL, heated (50℃, 4h), filtered, washed, dried, ground and sieved through a 150-mesh sieve to obtain pre-modified vermiculite.

[0043] S2. Modification of vermiculite: The pre-modified vermiculite obtained in step S1 was added to a 5wt% sodium trifluoroacetate aqueous solution at a ratio of 1g:6mL for treatment (65℃, 5h). After treatment, it was filtered, washed, and dried to obtain pre-modified vermiculite. The obtained pre-modified vermiculite was added to a 0.1g / mL boric acid ethanol solution at a ratio of 1g:20mL, and then heated (60℃, 15min). After treatment, modified vermiculite was obtained.

[0044] S3, Modification of carbon nanotubes: Carbon nanotubes were placed in a mixed acid (obtained by mixing concentrated sulfuric acid and concentrated nitric acid in a volume ratio of 1:3) for treatment (65℃, 4h). After treatment, the carbon nanotubes were filtered, washed and dried to obtain modified carbon nanotubes.

[0045] S4. Add fatty alcohol polyoxyethylene ether to raw lacquer, stir evenly, then add polyurethane emulsion, stir evenly again, then add modified vermiculite obtained in step S2 and modified nanotubes obtained in step S3, stir evenly again to obtain flame retardant finishing liquid; the mass ratio of fatty alcohol polyoxyethylene ether, raw lacquer, polyurethane emulsion, modified vermiculite and modified nanotubes is 1.6:100:22:6:0.9.

[0046] The waterproof finishing process involves immersing the dried polyester fabric in a waterproof finishing solution at 35°C for 6 hours, followed by pressing. The waterproof finishing solution consists of 2g of organic fluorine waterproofing agent, 0.8g of organic silicone finishing agent, and 100g of water.

[0047] Example 2

[0048] A method for preparing a flame-retardant and waterproof fabric for bags includes the following steps: after cleaning and removing impurities from the polyester fabric and drying it, flame-retardant finishing is performed first, followed by drying (95℃, 4min) and baking (170℃, 2min) and then waterproof finishing, followed by drying (100℃, 3min) and baking (160℃, 2min) to obtain the flame-retardant and waterproof fabric.

[0049] The flame-retardant finishing process involves immersing the polyester fabric in a flame-retardant finishing solution for 2 hours, followed by rolling. The preparation of the flame-retardant finishing solution includes the following steps:

[0050] S1. Pre-modification of vermiculite: Vermiculite raw material was added to 0.16mol / L hydrochloric acid solution at a dosage ratio of 1g:12mL, heated (50℃, 4h), filtered, washed, dried, ground and sieved through a 150-mesh sieve to obtain pre-modified vermiculite.

[0051] S2. Modification of vermiculite: The pre-modified vermiculite obtained in step S1 was added to a 4.5wt% sodium trifluoroacetate aqueous solution at a ratio of 1g:5mL for treatment (65℃, 5h). After treatment, it was filtered, washed, and dried to obtain pre-modified vermiculite. The obtained pre-modified vermiculite was added to a 0.1g / mL boric acid ethanol solution at a ratio of 1g:18mL, and then heated (65℃, 10min). After treatment, modified vermiculite was obtained.

[0052] S3, Modification of carbon nanotubes: Carbon nanotubes were placed in a mixed acid (obtained by mixing concentrated sulfuric acid and concentrated nitric acid in a volume ratio of 1:3) for treatment (65℃, 3.5h). After treatment, the carbon nanotubes were filtered, washed and dried to obtain modified carbon nanotubes.

[0053] S4. Add fatty alcohol polyoxyethylene ether to raw lacquer, stir evenly, then add polyurethane emulsion, stir evenly again, then add modified vermiculite obtained in step S2 and modified nanotubes obtained in step S3, stir evenly again to obtain flame retardant finishing liquid; the mass ratio of fatty alcohol polyoxyethylene ether, raw lacquer, polyurethane emulsion, modified vermiculite and modified nanotubes is 1.6:100:24:6:0.85.

[0054] The waterproof finishing process involves immersing the dried polyester fabric in a waterproof finishing solution at 35°C for 6 hours, followed by pressing. The waterproof finishing solution consists of 2g of organic fluorine waterproofing agent, 0.9g of organic silicone finishing agent, and 100g of water.

[0055] Example 3

[0056] A method for preparing a flame-retardant and waterproof fabric for bags includes the following steps: after cleaning and removing impurities from the polyester fabric and drying it, flame-retardant finishing is performed first, followed by drying (95℃, 4min) and baking (170℃, 2min) and then waterproof finishing, followed by drying (100℃, 3min) and baking (160℃, 2min) to obtain the flame-retardant and waterproof fabric.

[0057] The flame-retardant finishing process involves immersing the polyester fabric in a flame-retardant finishing solution for 2 hours, followed by rolling. The preparation of the flame-retardant finishing solution includes the following steps:

[0058] S1. Pre-modification of vermiculite: Vermiculite raw material was added to 0.14mol / L hydrochloric acid solution at a dosage ratio of 1g:9mL, heated (55℃, 3.5h), filtered, washed, dried, ground and sieved through a 100-mesh sieve to obtain pre-modified vermiculite.

[0059] S2. Modification of vermiculite: The pre-modified vermiculite obtained in step S1 was added to a 5.5wt% sodium trifluoroacetate aqueous solution at a ratio of 1g:7mL for treatment (65℃, 5h). After treatment, it was filtered, washed, and dried to obtain pre-modified vermiculite. The obtained pre-modified vermiculite was added to a 0.11g / mL boric acid ethanol solution at a ratio of 1g:18mL, and then heated (60℃, 15min) to obtain modified vermiculite.

[0060] S3, Modification of carbon nanotubes: Carbon nanotubes were placed in a mixed acid (obtained by mixing concentrated sulfuric acid and concentrated nitric acid in a volume ratio of 1:3) for treatment (65℃, 4h). After treatment, the carbon nanotubes were filtered, washed and dried to obtain modified carbon nanotubes.

[0061] S4. Add fatty alcohol polyoxyethylene ether to raw lacquer, stir evenly, then add polyurethane emulsion, stir evenly again, then add modified vermiculite obtained in step S2 and modified nanotubes obtained in step S3, stir evenly again to obtain flame retardant finishing liquid; the mass ratio of fatty alcohol polyoxyethylene ether, raw lacquer, polyurethane emulsion, modified vermiculite and modified nanotubes is 1.5:100:21:2.5:1.

[0062] The waterproof finishing process involves immersing the dried polyester fabric in a waterproof finishing solution at 35°C for 6 hours, followed by pressing. The waterproof finishing solution consists of 2g of organic fluorine waterproofing agent, 0.8g of organic silicone finishing agent, and 100g of water.

[0063] Comparative Example 1

[0064] Compared with Example 1, the modification of sodium trifluoroacetate in step S2 is omitted in Comparative Example 1. Specifically, a method for preparing a flame-retardant and waterproof fabric for bags includes the following steps: after cleaning and removing impurities from the polyester fabric and drying it, flame-retardant finishing is performed first, followed by drying (95°C, 4 min) and baking (170°C, 2 min) and then waterproof finishing, followed by drying (100°C, 3 min) and baking (160°C, 2 min) to obtain the flame-retardant and waterproof fabric.

[0065] The flame-retardant finishing process involves immersing the polyester fabric in a flame-retardant finishing solution for 2 hours, followed by rolling. The preparation of the flame-retardant finishing solution includes the following steps:

[0066] S1. Pre-modification of vermiculite: Vermiculite raw material was added to 0.15mol / L hydrochloric acid solution at a dosage ratio of 1g:10mL, heated (50℃, 4h), filtered, washed, dried, ground and sieved through a 150-mesh sieve to obtain pre-modified vermiculite.

[0067] S2. Modification of vermiculite: The pre-modified vermiculite was added to a 0.1 g / mL boric acid ethanol solution at a ratio of 1 g: 20 mL, and then heated (60 °C, 15 min). After the treatment, modified vermiculite was obtained.

[0068] S3, Modification of carbon nanotubes: Carbon nanotubes were placed in a mixed acid (obtained by mixing concentrated sulfuric acid and concentrated nitric acid in a volume ratio of 1:3) for treatment (65℃, 4h). After treatment, the carbon nanotubes were filtered, washed and dried to obtain modified carbon nanotubes.

[0069] S4. Add fatty alcohol polyoxyethylene ether to raw lacquer, stir evenly, then add polyurethane emulsion, stir evenly again, then add modified vermiculite obtained in step S2 and modified nanotubes obtained in step S3, stir evenly again to obtain flame retardant finishing liquid; the mass ratio of fatty alcohol polyoxyethylene ether, raw lacquer, polyurethane emulsion, modified vermiculite and modified nanotubes is 1.6:100:22:6:0.9.

[0070] The waterproof finishing process involves immersing the dried polyester fabric in a waterproof finishing solution at 35°C for 6 hours, followed by pressing. The waterproof finishing solution consists of 2g of organic fluorine waterproofing agent, 0.8g of organic silicone finishing agent, and 100g of water.

[0071] Comparative Example 2

[0072] Compared with Example 1, the modification of boric acid in step S2 is omitted in Comparative Example 2. Specifically, a method for preparing a flame-retardant and waterproof fabric for bags includes the following steps: after cleaning and removing impurities from the polyester fabric and drying it, flame-retardant finishing is performed first, followed by drying (95°C, 4 min) and baking (170°C, 2 min) and then waterproof finishing, followed by drying (100°C, 3 min) and baking (160°C, 2 min) to obtain the flame-retardant and waterproof fabric.

[0073] The flame-retardant finishing process involves immersing the polyester fabric in a flame-retardant finishing solution for 2 hours, followed by rolling. The preparation of the flame-retardant finishing solution includes the following steps:

[0074] S1. Pre-modification of vermiculite: Vermiculite raw material was added to 0.15mol / L hydrochloric acid solution at a dosage ratio of 1g:10mL, heated (50℃, 4h), filtered, washed, dried, ground and sieved through a 150-mesh sieve to obtain pre-modified vermiculite.

[0075] S2. Modification of vermiculite: The pre-modified vermiculite obtained in step S1 was added to a 5wt% sodium trifluoroacetate aqueous solution for treatment (65℃, 5h) at a dosage ratio of 1g:6mL. After treatment, the vermiculite was filtered, washed and dried to obtain the modified vermiculite.

[0076] S3, Modification of carbon nanotubes: Carbon nanotubes were placed in a mixed acid (obtained by mixing concentrated sulfuric acid and concentrated nitric acid in a volume ratio of 1:3) for treatment (65℃, 4h). After treatment, the carbon nanotubes were filtered, washed and dried to obtain modified carbon nanotubes.

[0077] S4. Add fatty alcohol polyoxyethylene ether to raw lacquer, stir evenly, then add polyurethane emulsion, stir evenly again, then add modified vermiculite obtained in step S2 and modified nanotubes obtained in step S3, stir evenly again to obtain flame retardant finishing liquid; the mass ratio of fatty alcohol polyoxyethylene ether, raw lacquer, polyurethane emulsion, modified vermiculite and modified nanotubes is 1.6:100:22:6:0.9.

[0078] The waterproof finishing process involves immersing the dried polyester fabric in a waterproof finishing solution at 35°C for 6 hours, followed by pressing. The waterproof finishing solution consists of 2g of organic fluorine waterproofing agent, 0.8g of organic silicone finishing agent, and 100g of water.

[0079] Comparative Example 3

[0080] Compared with Example 1, in Comparative Example 3, the waterproof finishing liquid and the flame retardant finishing liquid are mixed together for finishing. Specifically, a method for preparing a flame retardant and waterproof fabric for bags includes the following steps: after cleaning and removing impurities from the polyester fabric and drying it, flame retardant and waterproof finishing is performed, followed by drying (95°C, 4 min) and baking (170°C, 2 min) to obtain the flame retardant and waterproof fabric.

[0081] The flame-retardant and waterproof finishing process involves immersing the polyester fabric in a flame-retardant and waterproof finishing solution for 2 hours, followed by pressing. The flame-retardant and waterproof finishing solution is obtained by uniformly mixing a flame-retardant finishing solution and a waterproof finishing solution. The preparation of the flame-retardant finishing solution includes the following steps:

[0082] S1. Pre-modification of vermiculite: Vermiculite raw material was added to 0.15mol / L hydrochloric acid solution at a dosage ratio of 1g:10mL, heated (50℃, 4h), filtered, washed, dried, ground and sieved through a 150-mesh sieve to obtain pre-modified vermiculite.

[0083] S2. Modification of vermiculite: The pre-modified vermiculite obtained in step S1 was added to a 5wt% sodium trifluoroacetate aqueous solution at a ratio of 1g:6mL for treatment (65℃, 5h). After treatment, it was filtered, washed, and dried to obtain pre-modified vermiculite. The obtained pre-modified vermiculite was added to a 0.1g / mL boric acid ethanol solution at a ratio of 1g:20mL, and then heated (60℃, 15min). After treatment, modified vermiculite was obtained.

[0084] S3, Modification of carbon nanotubes: Carbon nanotubes were placed in a mixed acid (obtained by mixing concentrated sulfuric acid and concentrated nitric acid in a volume ratio of 1:3) for treatment (65℃, 4h). After treatment, the carbon nanotubes were filtered, washed and dried to obtain modified carbon nanotubes.

[0085] S4. Add fatty alcohol polyoxyethylene ether to raw lacquer, stir evenly, then add polyurethane emulsion, stir evenly again, then add modified vermiculite obtained in step S2 and modified nanotubes obtained in step S3, stir evenly again to obtain flame retardant finishing liquid; the mass ratio of fatty alcohol polyoxyethylene ether, raw lacquer, polyurethane emulsion, modified vermiculite and modified nanotubes is 1.6:100:22:6:0.9.

[0086] The waterproof finishing liquid consists of: 2g of organic fluorine waterproofing agent, 0.8g of organic silicone finishing agent, and 100g of water.

[0087] The dosages of the flame-retardant finishing liquid and the waterproof finishing liquid are the same as in Example 1.

[0088] The flame retardant properties of the fabrics prepared in Example 1 and Comparative Examples 1 to 3 were tested in accordance with GB / T 5455-2014 and GB / 13767-1992. The flame retardant properties of the fabrics after 50 washes were also tested. The results are shown in Tables 1 and 2.

[0089] Table 1 Flame retardant properties of the fabric before washing

[0090]

[0091] Table 2 Flame retardant properties of the fabric after washing

[0092]

[0093] The waterproof performance of the fabrics prepared in Example 1 and Comparative Examples 1-3 was tested in accordance with GB / T 4745-2012. The waterproof performance of the fabrics after 50 washes was also tested. The test results are shown in Table 3.

[0094] Table 3. Test results of fabric waterproof performance

[0095]

[0096] As can be seen from Tables 1-3, the fabric prepared by this invention has excellent waterproof and flame-retardant properties, and can still maintain good performance after washing.

[0097] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for preparing a flame-retardant and waterproof fabric for bags, characterized in that, The process includes the following steps: After cleaning and removing impurities from the polyester fabric and drying it, it is first treated with flame retardant finishing, then dried and baked once before being treated with waterproof finishing, and finally dried and baked a second time to obtain the flame retardant and waterproof fabric. The flame-retardant finishing process involves immersing the polyester fabric in a flame-retardant finishing solution for 0.5–5 hours, followed by rolling. The preparation of the flame-retardant finishing solution includes the following steps: S1. Pre-modification of vermiculite: Vermiculite raw material is added to hydrochloric acid solution, heated, filtered, washed, dried, ground and sieved to obtain pre-modified vermiculite; S2. Modification of vermiculite: The pre-modified vermiculite obtained in step S1 is added to an aqueous solution of sodium trifluoroacetate for treatment. After treatment, it is filtered, washed, and dried to obtain pre-modified vermiculite. The obtained pre-modified vermiculite is added to a boric acid ethanol solution and then heated. After treatment, modified vermiculite is obtained. S3. Modification of carbon nanotubes: Carbon nanotubes are placed in a mixed acid for treatment. After treatment, they are then filtered, washed, and dried to obtain modified carbon nanotubes. S4. Add fatty alcohol polyoxyethylene ether to the raw lacquer, stir evenly, then add polyurethane emulsion, stir evenly again, then add the modified vermiculite obtained in step S2 and the modified nanotubes obtained in step S3, stir evenly again to obtain the flame retardant finishing liquid. In step S1, the concentration of hydrochloric acid solution is 0.1~0.25mol / L; the heating temperature is 40~55℃, the treatment time is 2~8h, the ratio of vermiculite to hydrochloric acid solution is 1g:5~12mL, and the sieve mesh size is 100~150 mesh. In step S2, the concentration of sodium trifluoroacetate aqueous solution is 4-8 wt%, and the ratio of pre-modified vermiculite to sodium trifluoroacetate aqueous solution is 1 g: 4-8 mL. The pre-modified vermiculite was treated in an aqueous solution of sodium trifluoroacetate at a temperature of 50-70℃ for 4-8 hours. In step S2, the concentration of boric acid ethanol solution is 0.05~0.15g / mL, and the ratio of the amount of pre-modified vermiculite to boric acid ethanol solution is 1g:15~25mL. The preliminary modified vermiculite was heated in boric acid ethanol solution at a temperature of 55~70℃ for a time of 10~25 min. In step S3, the mixed acid is obtained by mixing concentrated sulfuric acid and concentrated nitric acid in a volume ratio of 1:3; the mass ratio of carbon nanotubes to the mixed acid is 1:40~60; the treatment temperature is 55~75℃ and the treatment time is 2~6h.

2. The method for preparing a flame-retardant and waterproof fabric for bags according to claim 1, characterized in that, In step S4, the mass ratio of fatty alcohol polyoxyethylene ether, raw lacquer, polyurethane emulsion, modified vermiculite, and modified nanotubes is 1.5~2.5:100:20~30:3~12:0.8~2.

3. The method for preparing a flame-retardant and waterproof fabric for bags according to claim 1, characterized in that, Waterproof finishing involves immersing the polyester fabric, which has been dried once, in a waterproof finishing solution at 30-45°C for 4-8 hours, followed by pressing. The waterproof finishing liquid consists of: 1~4g of organic fluorine waterproofing agent, 0.5~1.5g of organic silicone finishing agent, and 100g of water.

4. The method for preparing a flame-retardant and waterproof fabric for bags according to claim 1, characterized in that, The first drying temperature is 95℃ and the drying time is 3~6 minutes; the first baking temperature is 170~175℃ and the time is 1~3 minutes. The secondary drying temperature is 100℃ and the drying time is 1~5min; the secondary baking temperature is 160℃ and the time is 1~4min.

5. A flame-retardant and waterproof fabric prepared by the method according to any one of claims 1 to 4.

6. The application of the flame-retardant and waterproof fabric of claim 5 in the manufacture of bags.

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