Environment-friendly antibacterial flame-retardant cotton fabric and preparation method thereof

Abstract

The invention discloses an environment-friendly antibacterial flame-retardant cotton fabric and a preparation method thereof. The preparation method of the environment-friendly antibacterial flame-retardant cotton fabric comprises the following steps: desizing the cotton fabric; immersing the desized cotton fabric into a cation solution for finishing, taking out, washing and drying, then immersing into an anion solution for finishing, taking out, washing and drying, completing one-time circulation, and obtaining the cotton fabric after layer-by-layer assembly through multiple times of circulation; immersing the cotton fabric assembled layer by layer into a cation solution for finishing, taking out and washing, then immersing into a pomegranate peel tannin extracting solution for treatment, taking out and washing; immersing the cotton fabric treated by the pomegranate rind tannin extracting solution into a metal ion solution for treatment, taking out, washing and drying to obtain the environment-friendly antibacterial flame-retardant cotton fabric. According to the preparation method disclosed by the invention, the cotton fabric is finished through the bio-based flame-retardant material, so that the cotton fabric is endowed with a certain bacteriostatic action while being endowed with a good flame-retardant effect, is good in washability and is environment-friendly and harmless to the environment.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of functional textiles, and particularly relates to an environmentally-friendly antibacterial and flame-retardant cotton fabric and a preparation method thereof. BACKGROUND

[0002] Cotton fabric, as one of the most popular natural textiles, has excellent moisture absorption, air permeability and flexibility, and is widely used in daily life and occupies a broad market of textiles. However, cotton fabric is a flammable material, and its limiting oxygen index (LOI) is only 18%, so the high flammability of cotton fabric can cause serious fire hazards and threaten people's property and life safety. Therefore, in the past few decades, people have become more and more interested in improving the flame retardancy of cotton fabric.

[0003] Traditional flame retardants such as halogen-based flame retardants have high flame retardant efficiency, but they produce toxic gases such as hydrogen halide and dioxin during combustion, which poses a great threat to the ecological environment and human life safety, and their use has been explicitly restricted by the EU REACH regulation and the US CPSC standard. Nitrogen-based flame retardants, silicon-based flame retardants, boron-based flame retardants and metal hydroxides and other flame retardants have the problems of poor effect when used alone, great influence on the hand feeling of the finished fabric or poor combination effect with cotton fabric and poor washability. In view of the increasing attention to environmental problems, people prefer green, renewable and efficient bio-based flame retardants.

[0004] In addition, the application of cotton fabric is not only limited by its inherent flammability, but also by the fact that it is prone to mold growth when used in humid environments, which can be overcome by imparting antibacterial properties to the cotton fabric. However, most traditional flame retardants have single functions and cannot simultaneously achieve antibacterial and flame-retardant requirements, so antibacterial and flame-retardant cotton fabric usually requires the use of both flame-retardant and antibacterial finishing agents. This not only increases the process flow of functional fabric preparation, but also is prone to chemical conflicts when two different types of auxiliaries are used together, resulting in functional degradation. Therefore, it is particularly important and urgent to develop a multifunctional environmentally-friendly cotton fabric that combines flame retardation and antibacterial properties. SUMMARY

[0005] To solve the problems raised in the background art, the present application aims to provide an environmentally-friendly antibacterial and flame-retardant cotton fabric and a preparation method thereof. The preparation method of the present application uses bio-based flame-retardant materials to finish the cotton fabric, which not only imparts good flame-retardant effect to the cotton fabric, but also imparts certain antibacterial effect to the cotton fabric, and has good washability and is harmless to the environment.

[0006] To achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows: on the one hand, the present application provides a preparation method of an environmentally-friendly antibacterial and flame-retardant cotton fabric, comprising the following steps:

[0007] (1) carrying out desizing treatment on the cotton fabric, and taking out, washing and drying the treated cotton fabric to obtain desized cotton fabric;

[0008] (2) immersing the desized cotton fabric into a cationic solution to carry out first finishing, taking out, washing and drying the finished fabric, then immersing the fabric into an anionic solution to carry out second finishing, taking out, washing and drying the finished fabric, completing one cycle, and continuing to immerse the fabric into the cationic solution and the anionic solution alternately to carry out alternate deposition for a suitable number of times to obtain the layer-by-layer assembled cotton fabric;

[0009] (3) immersing the layer-by-layer assembled cotton fabric into a cationic solution to carry out third finishing, taking out, washing and drying the finished fabric, then immersing the fabric into a pomegranate peel tannin extract to carry out first treatment, and taking out and washing the treated fabric;

[0010] (4) immersing the cotton fabric treated with the pomegranate peel tannin extract in step (3) into a metal ion solution to carry out second treatment, and taking out, washing and drying the treated fabric to obtain the environment-friendly antibacterial and flame-retardant cotton fabric.

[0011] Before the cotton fabric is immersed into the pomegranate peel tannin extract for treatment, the cotton fabric needs to be finished once again with a cationic solution, which aims to provide more sites for the pomegranate peel tannin to combine with, because in the previous layer-by-layer assembly, the cations in the cationic solution mainly combine with the anions in the anionic solution, and there are fewer remaining cationic sites. If this step is not taken, the pomegranate peel tannin will combine less, which will affect the flame-retardant and antibacterial effects.

[0012] Further, in step (1), the desizing treatment is carried out by immersing the cotton fabric in a 0.5-1 mol / L NaOH solution at 80-90℃ for 30-60 min.

[0013] Further, in step (2), the cationic solution is a chitosan-acetic acid solution, and the mass percentage concentration of chitosan in the chitosan-acetic acid solution is 1-3%, and the acetic acid is adjusted to a pH of 4-5.

[0014] Chitosan is a safe and environmentally friendly carbon-rich polymer, which can be used as a carbonizing agent in a flame-retardant system. In addition, chitosan contains nitrogen elements and can also be used as a foaming agent. Chitosan also has antibacterial effect.

[0015] Further, in step (2), the first finishing time is 3-5 min.

[0016] Further, in step (2), the first finishing process needs to be stirred.

[0017] Further, in step (2), the anionic solution is a phytic acid solution, and the mass percentage concentration of the phytic acid solution is 3-5%.

[0018] Phytic acid, also known as myo-inositol hexakisphosphate, is a biocompatible, non-toxic, environmentally friendly and easily available compound extracted from legumes, oilseeds and cereals. As a natural organic phosphorus compound, phytic acid contains abundant phosphate groups and is an excellent biomass flame retardant. On the one hand, thermal decomposition of phytic acid can form phosphorus radicals to capture high-activity H· and OH· free radicals, reducing flame energy and achieving gas-phase flame retardation. On the other hand, phytic acid generally decomposes into phosphoric acid or polyphosphoric acid during combustion, which promotes the formation of graphitized carbon layers through catalysis, preventing heat diffusion and pyrolysis product formation.

[0019] Further, the second finishing in step (2) is performed for 3-5 minutes.

[0020] Further, the second finishing in step (2) is performed with stirring.

[0021] Further, the suitable number of times in step (2) is 3-5 times.

[0022] Further, the cationic solution in step (3) is a chitosan-acetic acid solution, and the mass percentage concentration of chitosan in the chitosan-acetic acid solution is 3%, and acetic acid is used to adjust the pH to 4-5.

[0023] Further, the third finishing in step (3) is performed for 5-8 minutes.

[0024] Further, the third finishing in step (3) is performed with stirring.

[0025] Further, the preparation method of the pomegranate peel tannin extract in step (3) is as follows:

[0026] Dry the pomegranate peel to a constant weight, crush and sieve to obtain pomegranate peel powder, immerse the pomegranate peel powder in a solvent, filter the supernatant, immerse again under the same conditions for one time, and combine the filtrates to obtain the pomegranate peel tannin extract.

[0027] Further, the ratio of the pomegranate peel powder to the solvent is 1g:(20-30)mL.

[0028] Further, the solvent is water.

[0029] Further, the temperature of the immersion is 50-60℃, and the time of the immersion is 1-2h.

[0030] Pomegranate peel is the dried pericarp of pomegranate, and contains a large amount of tannin, about 25%-30% of pomegranate peel, in addition to polyphenols, organic acids, sterols, flavonoids and other active substances. Tannin and flavonoids in pomegranate peel have a wide range of antibacterial activity. Due to the special aromatic structure and phenolic hydroxyl of tannin, it has high chemical and thermal stability and low thermal conductivity, and is used as carbonizing agent in flame retardant system.

[0031] Further, the temperature of the first treatment in step (3) is 70-80 DEG C, and the time of the first treatment is 1-2 h.

[0032] Further, the metal ion in the metal ion solution in step (4) is Al 3+ or Fe 2+ , and the mass percentage concentration of the metal ion solution is 1-3%.

[0033] Further, the temperature of the second treatment is 70-80 DEG C, and the time of the second treatment is 30-50 min.

[0034] On the other hand, the present application provides an environmentally friendly antibacterial flame-retardant cotton fabric prepared by the preparation method.

[0035] Compared with the prior art, the present application has the following beneficial effects:

[0036] (1) The present application uses phytic acid as the acid source, pomegranate peel tannin as the carbon source, and chitosan as the gas source and carbon source to prepare an intumescent flame-retardant cotton fabric. When the fabric is burned, the carbon source is dehydrated and cross-linked under the action of the acid source to form carbon, and the carbon forms a carbon layer with a foaming closed structure under the action of the gas decomposed by the gas source. The carbon layer is non-flammable and can prevent heat conduction between the cotton fabric and the heat source. In addition, the porous carbon layer can prevent the diffusion of pyrolysis gas and the diffusion of external oxygen to the surface of the uncracked cotton fabric. When the combustion cannot obtain sufficient oxygen and heat energy, the burning cotton fabric will self-extinguish, achieving the effects of heat insulation, oxygen isolation, smoke suppression and flame retardance. Moreover, the selected flame retardant raw materials in the present application are all biomass materials, and do not contain halogen during combustion, which is green and environmentally friendly.

[0037] (2) Conventional flame retardants have single performance and are difficult to meet market demand. The present application introduces pomegranate peel tannin as an antibacterial agent, which gives the cotton fabric excellent bacteriostatic effect on E. coli and S. aureus, and also acts as a carbon source to achieve synergistic flame retardation with the chitosan / phytic acid system.

[0038] (3) Layer-by-layer self-assembly method (LBL method) is used to deposit chitosan / phytic acid flame-retardant coating on the surface of cotton fabric, so that the cotton fabric is endowed with certain flame retardancy, but the LBL method has defects such as poor durability and the need for many layers of finishing. The present application only finishes 3-5 layers of chitosan / phytic acid flame-retardant coating, and further finishes pomegranate peel tannin after chelating with metal ions, so that the flame-retardant ability of the cotton fabric is improved, the LOI is greater than 28, and the washing resistance is good. DETAILED DESCRIPTION

[0039] The present application will be further described below. The following examples are only used to more clearly illustrate the technical solutions of the present application, and cannot be used to limit the protection scope of the present application.

[0040] Example 1

[0041] Bacteriostasis test of five plant raw materials with high tannin content

[0042] Five plant raw materials with high tannin content, such as Dioscorea cirrhosa, catechu, gallnut, acacia and pomegranate peel, are selected, dried to constant weight, crushed by a pulverizer, and sieved through a 40-mesh sieve. 10 g of each raw material powder is weighed, 200 mL of deionized water is added, and then extracted at 60°C for 1 h. The supernatant is filtered, and the same condition is extracted once again. The filtrates are combined and concentrated to 25 mL. The bacteriostasis effect of the five extracts is determined by the inhibition zone method.

[0043] The specific method is as follows: the drug-sensitive paper disc (diameter 6 mm) is soaked in the five plant extracts and sterile water for 30 minutes, taken out, and dried in a sterile environment; 100 μL of 10 6 CFU / mL of E. coli and S. aureus bacterial suspensions are uniformly coated on the nutrient agar medium; the dried paper disc is pasted on the two bacterial plates, wherein two pieces of paper disc soaked with sample solution are placed in each bacterial plate as two groups of parallel samples, the average value of the inhibition zone is taken, and one piece of blank control paper disc is used as a control sample, and the three paper discs are uniformly distributed. After being placed in a constant-temperature incubator at 37°C for 18 h, it is observed and recorded. The results are shown in Table 1.

[0044] Table 1 Inhibition zone results

[0045]

[0046] As shown in Table 1, the pomegranate peel extract has the best inhibition effect on E. coli and S. aureus among the five plants, and has the largest inhibition zone, so the pomegranate peel extract is selected in the present application.

[0047] Example 2

[0048] Preparation of pomegranate peel tannin extract: dry the pomegranate peel to constant weight, crush it with a pulverizer, and sieve it through a 40-mesh sieve to obtain pomegranate peel powder. Add the pomegranate peel powder to water and extract it at 60°C for 1 h. Filter the supernatant, extract it again under the same conditions, and combine the two filtrates to obtain the pomegranate peel tannin extract. The ratio of pomegranate peel powder to water is 1 g:20 mL.

[0049] Preparation of an environmentally friendly antibacterial and flame-retardant cotton fabric

[0050] (1) Soak the cotton fabric in a 1 mol / L NaOH solution at 90°C for 30 min. After soaking, wash and dry the cotton fabric to obtain a desized cotton fabric.

[0051] (2) Soak the desized cotton fabric in a 3% chitosan-acetic acid solution, adjust the pH to 4 with acetic acid, and stir for 5 min. After finishing, wash and dry the cotton fabric at 70°C. Then, soak the cotton fabric in a 5% phytic acid solution, stir for 5 min, and finish. After finishing, wash and dry the cotton fabric at 70°C to complete one cycle. Continue to alternate soaking in the chitosan-acetic acid solution and the phytic acid solution for 3 cycles to obtain a layer-by-layer assembled cotton fabric.

[0052] (3) Soak the layer-by-layer assembled cotton fabric in a 3% chitosan-acetic acid solution, adjust the pH to 4 with acetic acid, and stir for 5 min. After finishing, wash the cotton fabric, and then soak it in a pomegranate peel tannin extract. Treat it at 80°C for 2 h, and then wash and dry the cotton fabric.

[0053] (4) Soak the cotton fabric treated with the pomegranate peel tannin extract in a 3% alum solution, and soak it at 80°C for 50 min. After soaking, wash and dry the cotton fabric to obtain an environmentally friendly antibacterial and flame-retardant cotton fabric.

[0054] Example 3

[0055] Preparation of pomegranate peel tannin extract: dry the pomegranate peel to constant weight, crush it with a pulverizer, and sieve it through a 40-mesh sieve to obtain pomegranate peel powder. Add the pomegranate peel powder to water and extract it at 50°C for 2 h. Filter the supernatant, extract it again under the same conditions, and combine the two filtrates to obtain the pomegranate peel tannin extract. The ratio of pomegranate peel powder to water is 1 g:30 mL.

[0056] Preparation of an environmentally friendly antibacterial and flame-retardant cotton fabric

[0057] (1) Soak the cotton fabric in a 1 mol / L NaOH solution at 90°C for 30 min. After soaking, wash and dry the cotton fabric to obtain a desized cotton fabric.

[0058] (2) The desized cotton fabric is immersed in 1% chitosan-acetic acid solution, the acetic acid is adjusted to pH 4, and stirring finishing is performed for 5 min. After finishing, the fabric is taken out, washed, and dried at 70°C. Then the fabric is immersed in 3% phytic acid solution, stirring finishing is performed for 5 min, and after finishing, the fabric is taken out, washed, and dried at 70°C to complete one cycle. The fabric is immersed in chitosan-acetic acid solution and phytic acid solution alternately for 5 cycles to obtain the layer-by-layer assembled cotton fabric;

[0059] (3) The layer-by-layer assembled cotton fabric is immersed in 3% chitosan-acetic acid solution, the acetic acid is adjusted to pH 4, and stirring finishing is performed for 8 min. After finishing, the fabric is taken out, washed, and then immersed in pomegranate peel tannin extract solution, and treated at 80°C for 1 h. After treatment, the fabric is taken out and washed;

[0060] (4) The cotton fabric treated by pomegranate peel tannin extract solution is immersed in 3% ferrous sulfate solution, soaked at 80°C for 40 min, taken out, washed, and dried to obtain the environment-friendly antibacterial and flame-retardant cotton fabric.

[0061] Example 4

[0062] Preparation of pomegranate peel tannin extract solution: Dry pomegranate peel to constant weight, crush it with a pulverizer, and sieve it through a 40-mesh sieve to obtain pomegranate peel powder. The pomegranate peel powder is added to water, and extracted at 60°C for 1.5 h. The supernatant is obtained by filtration, and the same condition is used for extraction again. The two filtrates are combined to obtain the pomegranate peel tannin extract solution. The ratio of pomegranate peel powder to water is 1 g:25 mL.

[0063] Preparation of environment-friendly antibacterial and flame-retardant cotton fabric:

[0064] (1) The cotton fabric is immersed in 1 mol / L NaOH solution at 90°C for 30 min. After soaking, the fabric is taken out, washed, and dried to obtain the desized cotton fabric;

[0065] (2) The desized cotton fabric is immersed in 2% chitosan-acetic acid solution, the acetic acid is adjusted to pH 5, and stirring finishing is performed for 3 min. After finishing, the fabric is taken out, washed, and dried at 80°C. Then the fabric is immersed in 4% phytic acid solution, stirring finishing is performed for 3 min, and after finishing, the fabric is taken out, washed, and dried at 80°C to complete one cycle. The fabric is immersed in chitosan-acetic acid solution and phytic acid solution alternately for 4 cycles to obtain the layer-by-layer assembled cotton fabric;

[0066] (3) The layer-by-layer assembled cotton fabric is immersed in 3% chitosan-acetic acid solution, the acetic acid is adjusted to pH 4, and stirring finishing is performed for 7 min. After finishing, the fabric is taken out, washed, and then immersed in pomegranate peel tannin extract solution, and treated at 70°C for 2 h. After treatment, the fabric is taken out and washed;

[0067] (4) the cotton fabric treated by the pomegranate peel tannin extract solution is immersed in a 1% ferrous sulfate solution, soaked at 70°C for 50 min, taken out, washed, and dried to obtain the environment-friendly antibacterial and flame-retardant cotton fabric.

[0068] Comparative Example 1

[0069] Preparation of the environment-friendly antibacterial and flame-retardant cotton fabric:

[0070] (1) the cotton fabric is immersed in a 1 mol / L NaOH solution at 90°C for 30 min, taken out, washed, and dried to obtain the desized cotton fabric;

[0071] (2) the desized cotton fabric is immersed in a 3% chitosan-acetic acid solution, the acetic acid is adjusted to a pH of 4, and stirring finishing is performed for 5 min, the fabric is taken out, washed, and dried at 70°C after finishing, then immersed in a 5% phytic acid solution, stirring finishing is performed for 5 min, the fabric is taken out, washed, and dried at 70°C after finishing, to complete one cycle; the fabric is sequentially immersed in the chitosan-acetic acid solution and the phytic acid solution for 3 cycles of alternate deposition to obtain the environment-friendly antibacterial and flame-retardant cotton fabric.

[0072] Comparative Example 2

[0073] Preparation of the environment-friendly antibacterial and flame-retardant cotton fabric:

[0074] (1) the cotton fabric is immersed in a 1 mol / L NaOH solution at 90°C for 30 min, taken out, washed, and dried to obtain the desized cotton fabric;

[0075] (2) the desized cotton fabric is immersed in a 3% chitosan-acetic acid solution, the acetic acid is adjusted to a pH of 4, and stirring finishing is performed for 5 min, the fabric is taken out, washed, and dried at 70°C after finishing, then immersed in a 5% phytic acid solution, stirring finishing is performed for 5 min, the fabric is taken out, washed, and dried at 70°C after finishing, to complete one cycle; the fabric is sequentially immersed in the chitosan-acetic acid solution and the phytic acid solution for 3 cycles of alternate deposition to obtain the environment-friendly antibacterial and flame-retardant cotton fabric.

[0076] (3) the layer-by-layer assembled cotton fabric is immersed in a 3% alum solution, soaked at 80°C for 50 min, taken out, washed, and dried.

[0077] Comparative Example 3

[0078] Preparation of the pomegranate peel tannin extract solution: dried pomegranate peel is ground by a pulverizer and sieved through a 40-mesh sieve to obtain pomegranate peel powder, the pomegranate peel powder is added to water and extracted at 60°C for 1 h, the supernatant is taken after filtration, and the same condition is used for another extraction, and the two filtrates are combined to obtain the pomegranate peel tannin extract solution. The ratio of the pomegranate peel powder to water is 1 g:20 mL.

[0079] Preparation of the environment-friendly antibacterial and flame-retardant cotton fabric:

[0080] (1) cotton fabric is soaked in 1 mol / L NaOH solution at 90°C for 30 min, and after soaking, it is taken out, washed and dried to obtain desized cotton fabric;

[0081] (2) the desized cotton fabric is immersed in 3% chitosan-acetic acid solution, acetic acid is used to adjust pH to 4, stirring finishing is carried out for 5 min, after finishing, it is taken out, washed, and then immersed in pomegranate peel tannin extract solution, and treated at 80°C for 2 h, after treatment, it is taken out, washed, and dried to obtain the environment-friendly antibacterial and flame-retardant cotton fabric.

[0082] (3) the cotton fabric treated by pomegranate peel tannin extract solution is immersed in 3% alum solution, and soaked at 80°C for 50 min, after soaking, it is taken out, washed, and dried to obtain the environment-friendly antibacterial and flame-retardant cotton fabric.

[0083] Comparative Example 4

[0084] Preparation of pomegranate peel tannin extract solution: dry pomegranate peel to constant weight, crush by a pulverizer, and sieve through a 40-mesh sieve to obtain pomegranate peel powder, the pomegranate peel powder is added into water, and extracted at 60°C for 1 h, the supernatant is obtained by filtration, and the same condition is used for extraction again, and the two filtrates are combined to obtain pomegranate peel tannin extract solution. The ratio of pomegranate peel powder to water is 1 g:20 mL.

[0085] Preparation of environment-friendly antibacterial and flame-retardant cotton fabric:

[0086] (1) cotton fabric is soaked in 1 mol / L NaOH solution at 90°C for 30 min, and after soaking, it is taken out, washed and dried to obtain desized cotton fabric;

[0087] (2) the desized cotton fabric is immersed in 3% chitosan-acetic acid solution, acetic acid is used to adjust pH to 4, stirring finishing is carried out for 5 min, after finishing, it is taken out, washed, and then immersed in 5% phytic acid solution, stirring finishing is carried out for 5 min, after finishing, it is taken out, washed, and dried at 70°C, and one cycle is completed; and then the cotton fabric is immersed in chitosan-acetic acid solution and phytic acid solution in turn for 3 cycles to obtain layer-by-layer assembled cotton fabric;

[0088] (3) the layer-by-layer assembled cotton fabric is immersed in 3% chitosan-acetic acid solution, acetic acid is used to adjust pH to 4, stirring finishing is carried out for 5 min, after finishing, it is taken out, washed, and then immersed in pomegranate peel tannin extract solution, and treated at 80°C for 2 h, after treatment, it is taken out, washed, and dried to obtain the environment-friendly antibacterial and flame-retardant cotton fabric.

[0089] Comparative Example 5

[0090] Blank cotton fabric

[0091] The environmentally friendly antibacterial flame-retardant cotton fabric prepared in Examples 2-4 and Comparative Examples 1-4 and the blank cotton fabric of Comparative Example 5 were subjected to flame-retardant property testing and bacteriostatic property testing:

[0092] Limiting oxygen index: determined according to GB / T 5454-1997 "Textiles - Determination of burning behavior - Measurement of flammability and maximum use temperature".

[0093] Char length: determined according to GB / T 5455-2014 "Textiles - Determination of burning behavior - Measurement of flame spread and char length".

[0094] Bacteriostatic rate: tested according to GB / T 20944.3-2008 "Textiles - Evaluation of antibacterial properties - Part 3: shaking method".

[0095] The washing method of the fabric refers to GB / T 3921-2008 "Textiles - Test methods for color fastness - Color fastness to soaping".

[0096] The flame-retardant property testing results of the cotton fabric are shown in Table 2.

[0097] Table 2 Flame-retardant property of cotton fabric

[0098]

[0099] As shown in Table 2, the LOI of the blank cotton fabric without treatment is only 18.0%, which is completely burned during the vertical burning process, and the char length is 30 cm, indicating that the flame-retardant property is poor. After the layer-by-layer assembly of chitosan / phytic acid, the LOI is 21.4% and the char length is 18.5 cm, and the flame-retardant property is improved but does not reach the B1 level flame-retardant property requirement in GB / T 17591-2006 "Flame-retardant fabric". Further finishing with metal ions or increasing pomegranate tannin finishing further improves the flame-retardant property, but still does not reach the B1 level flame-retardant property requirement. The LOI of the flame-retardant cotton fabric prepared in Examples 2-4 is higher than 28%, and the char length is ≤15 cm, reaching the B1 level flame-retardant property requirement in GB / T 17591-2006 "Flame-retardant fabric", indicating that the flame-retardant property of the flame-retardant cotton fabric prepared in Examples 2-4 is excellent and the carbonization performance is good. And after 20 times of washing, the flame-retardant property only slightly decreases, and the washing resistance is good.

[0100] The bacteriostatic property testing results of the cotton fabric are shown in Table 3.

[0101] Table 3 Bacteriostatic property of cotton fabric

[0102]

[0103]

[0104] As shown in Table 3, the cotton fabric prepared in Examples 2-4 has excellent inhibitory effect on both E. coli and S. aureus, and the inhibitory effect on the two bacteria is still above 90% after 20 times of washing. The inhibitory effect of the cotton fabric only subjected to the layer-by-layer assembly of chitosan / phytic acid and the cotton fabric only subjected to the treatment with pomegranate peel tannin is weaker than that of the Examples.

[0105] The above description is merely preferred specific embodiments of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can make equivalent replacements or changes to the technical scheme and concept of the present application within the technical scope disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A method for preparing an environmentally friendly antibacterial and flame-retardant cotton fabric, characterized in that, The method comprises the following steps: (1) desizing treatment is performed on the cotton fabric, and after the treatment, the cotton fabric is taken out, washed and dried to obtain desized cotton fabric; (2) the desized cotton fabric is immersed in a cationic solution for first finishing, and after the finishing, the cotton fabric is taken out, washed and dried, and then immersed in an anionic solution for second finishing, and after the finishing, the cotton fabric is taken out, washed and dried, to complete one cycle, and the cotton fabric is continuously immersed in the cationic solution and the anionic solution in turn for alternate deposition to obtain layer-by-layer assembled cotton fabric after a suitable number of times; (3) the layer-by-layer assembled cotton fabric is immersed in a cationic solution for third finishing, and after the finishing, the cotton fabric is taken out, washed and then immersed in a pomegranate peel tannin extract solution for first treatment, and after the treatment, the cotton fabric is taken out and washed; (4) the cotton fabric treated by the pomegranate peel tannin extract solution in step (3) is immersed in a metal ion solution for second treatment, and after the treatment, the cotton fabric is taken out, washed and dried to obtain the environment-friendly antibacterial and flame-retardant cotton fabric.

2. The production method according to claim 1, characterized by, In step (1), the desizing treatment is performed on the cotton fabric in a 0.5-1 mol / L NaOH solution at 80-90 DEG C for 30-60 min.

3. The preparation method according to claim 1, characterized in that, In step (2), the cationic solution is a chitosan-acetic acid solution, the mass percentage concentration of chitosan in the chitosan-acetic acid solution is 1-3%, and acetic acid is used to adjust the pH to 4-5; Preferably, the first finishing in step (2) is performed for 3-5 min. Preferably, the first finishing in step (2) needs to be stirred.

4. The method of claim 1, wherein, In step (2), the anionic solution is a phytic acid solution, and the mass percentage concentration of the phytic acid solution is 3-5%. Preferably, the second finishing in step (2) is performed for 3-5 min. Preferably, the second finishing in step (2) needs to be stirred.

5. The preparation method according to claim 1, characterized in that, In step (2), the suitable number of times is 3-5 times.

6. The method of claim 1, wherein, In step (3), the cationic solution is a chitosan-acetic acid solution, the mass percentage concentration of chitosan in the chitosan-acetic acid solution is 3%, and acetic acid is used to adjust the pH to 4-5; Preferably, the third finishing in step (3) is performed for 5-8 min. Preferably, the third finishing in step (3) needs to be stirred.

7. The preparation method according to claim 1, characterized in that, In step (3), the preparation method of the pomegranate peel tannin extract solution is as follows: The dried pomegranate peel is ground and sieved to obtain pomegranate peel powder, the pomegranate peel powder is added into a solvent for extraction, the supernatant is obtained by filtration, and the filtrate is obtained by combining the supernatant and the supernatant obtained by re-extracting the pomegranate peel powder under the same conditions; Preferably, the ratio of the pomegranate peel powder to the solvent is 1 g:(20-30) mL; Preferably, the extraction temperature is 50-60 DEG C, and the extraction time is 1-2 h.

8. The method of claim 1, wherein, In step (3), the first treatment is performed at 70-80 DEG C for 1-2 h.

9. The method of claim 1, wherein, The metal ion in the metal ion solution in step (4) is Al 3+ or Fe 2+ , and the mass percentage concentration of the metal ion solution is 1-3%. Preferably, the second treatment is performed at 70-80 DEG C for 30-50 min.

10. An environment-friendly antibacterial flame-retardant cotton fabric, characterized in that, The environment-friendly antibacterial and flame-retardant cotton fabric is prepared by the preparation method in any one of claims 1-9.

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