A process and application of preparing environmentally friendly fabric using recycled plastic bottles

Abstract

The present invention provides a process and application for preparing environmentally friendly fabrics from recycled plastic bottles, belonging to the field of plastic bottle recycling technology. The preparation process comprises the following steps: preparing a plastic cleaning agent; preparing a polyelectrolyte flame retardant; preparing recycled polyester fiber; preparing a compounded flame retardant; and preparing environmentally friendly antibacterial flame-retardant fabrics. The present invention prepares a plastic cleaning agent for cleaning recycled plastic bottles. The plastic cleaning agent prepared by the present invention has excellent decontamination and emulsification capabilities, and can effectively remove various stains on the plastic surface, such as oil and dust, thereby improving the cleanliness of the plastic. Furthermore, the addition of antibacterial adsorbent microspheres effectively adsorbs stains and impurities on the plastic surface, thereby enhancing the cleaning effect.

Description

Technical Field

[0001] The present invention relates to the technical field of plastic bottle recycling, and in particular to a process for preparing environmentally friendly fabrics by utilizing recycled plastic bottles and its application. Background Art

[0002] With the continuous rise of global environmental awareness and the strengthening of resource recycling policies, the recycling of waste plastics, especially polyethylene terephthalate (PET) plastic bottles, has become a major issue in environmental protection and resource conservation. According to statistics, the amount of PET plastic bottle waste generated globally each year is enormous. If this waste is not properly handled, it will have a long-term negative impact on the natural environment.

[0003] Currently, there are some technologies that use recycled plastic bottles to make fabrics. Among them, a common method is to crush and clean the recycled plastic bottles, then use a melt spinning process to make fibers, and then weave the fibers into fabrics. However, this method has some shortcomings. First, the cleaning process of plastic bottles is often not thorough enough, and residual impurities and bacteria will affect the quality and performance of the fibers. Secondly, since the fibers made from recycled plastic bottles are usually polyester fibers with a tight molecular structure and no natural antibacterial or flame retardant properties, the prepared fabrics still have certain limitations in terms of breathability, antibacterial, flame retardant and comfort, making it difficult to meet the needs of the high-end market.

[0004] Therefore, we proposed a process and application of preparing environmentally friendly fabrics using recycled plastic bottles. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the purpose of the present invention is to provide a process and application of preparing environmentally friendly fabrics using recycled plastic bottles.

[0006] A process for preparing environmentally friendly fabric using recycled plastic bottles comprises the following steps:

[0007] S1: Preparation of plastic cleaning agent

[0008] Antibacterial adsorption microspheres are prepared using calcined mussel shell powder, nisin and chitosan as raw materials, and 10-12 parts by weight of sodium sulfate decahydrate, 1-3 parts by weight of fatty alcohol polyoxyethylene ether, 1-2 parts by weight of sodium lauryl sulfonate, 3-5 parts by weight of sodium percarbonate, 3-5 parts by weight of sodium perborate, 5-8 parts by weight of citric acid, 15-20 parts by weight of sodium ethylenediaminetetraacetate and 10-12 parts by weight of the antibacterial adsorption microspheres are mixed to prepare a plastic cleaning agent;

[0009] S2: Preparation of polyelectrolyte flame retardant

[0010] A polyelectrolyte flame retardant was prepared using chitosan, sodium pyrophosphate and glacial acetic acid as raw materials.

[0011] S3: Preparation of recycled polyester fiber

[0012] The cleaned plastic bottles are crushed to obtain plastic particles, which are melted and added with plasticizers, stabilizers and polyelectrolyte flame retardants, and then spun to obtain recycled polyester fibers;

[0013] S4: Preparation of compound flame retardant

[0014] hydrolyzing starch under acidic conditions, then mixing the hydrolyzed starch with a phytic acid solution, and mixing the resulting reactant with ammonium polyphosphate to obtain a composite flame retardant;

[0015] S5: Preparation of environmentally friendly antibacterial and flame-retardant fabrics

[0016] Recycled polyester fibers are modified with dopamine and then placed in a nanosilver solution to obtain antibacterial regenerated polyester fibers. The antibacterial regenerated polyester fibers are immersed in a flame retardant finishing solution at room temperature and then baked to obtain antibacterial flame retardant regenerated polyester fibers. The antibacterial flame retardant regenerated polyester fibers are fed into a loom for weaving to obtain environmentally friendly antibacterial flame retardant fabrics.

[0017] Furthermore, the preparation of the plastic cleaning agent in step S1 specifically includes the following steps:

[0018] S1.1: Clean discarded mussel shells, remove any remaining shell flesh, and soak them in 0.5-1% dilute hydrochloric acid for 30-35 minutes. Rinse with distilled water, dry and crush, and pass through a 100-mesh sieve. Calcining the sieved mussel shell powder in a muffle furnace at 1000-1200°C for 3-4 hours to obtain calcined mussel shell powder.

[0019] S1.2: Add 0.2-0.3 parts by weight of calcined mussel shell powder and 3-5 parts by weight of nisin to 100-120 parts by weight of a 5-8% chitosan aqueous solution, stir and mix thoroughly to obtain a mixed solution, and slowly add the mixed solution dropwise to a 5-8% calcium chloride aqueous solution using a syringe to form a crude antimicrobial adsorption microsphere product;

[0020] S1.3: Wash the crude antibacterial adsorbent microspheres with distilled water 2-3 times, then immerse the antibacterial adsorbent microspheres in a 0.5-1 mol / L chloroacetic acid solution and adjust the pH to 8-9 with a 0.1-0.2 mol / L sodium hydroxide solution. After curing for 10-12 hours, wash again with distilled water until neutral, and dry to obtain the antibacterial adsorbent microspheres.

[0021] S1.4: Mix 10-12 parts by weight of sodium sulfate decahydrate, 1-3 parts by weight of fatty alcohol polyoxyethylene ether, 1-2 parts by weight of sodium lauryl sulfonate, 3-5 parts by weight of sodium percarbonate, 3-5 parts by weight of sodium perborate, 5-8 parts by weight of citric acid, 15-20 parts by weight of sodium ethylenediaminetetraacetate and 10-12 parts by weight of antibacterial adsorption microspheres, stir and disperse, heat to 50-60°C, keep warm for 0.5-3h, and stir at a speed of 100-200r / min to obtain a plastic cleaning agent.

[0022] Furthermore, step S2 of preparing the polyelectrolyte flame retardant specifically comprises the following steps:

[0023] S2.1: Add 4-5 parts by weight of chitosan to 300-400 parts by weight of deionized water, stir and mix, then add 4-5 parts by weight of glacial acetic acid, and stir at 60-65°C for 1-2 hours to obtain mixed solution I;

[0024] S2.2: Add 5-8 parts by weight of sodium pyrophosphate to 300-400 parts by weight of deionized water, mix by ultrasonication for 20-30 minutes, and then adjust the pH to neutral by adding glacial acetic acid to obtain mixed solution II;

[0025] S2.3: Place mixed solution I and mixed solution II in a constant pressure dropping funnel respectively, and add them dropwise at a uniform rate into 100-120 parts by weight of deionized water at 40-45°C. Continuously perform magnetic stirring during the addition process. After the addition is completed, continue stirring for 1-2 hours, filter to obtain the product, wash the product with deionized water, and dry it to obtain a polyelectrolyte flame retardant.

[0026] Furthermore, step S3 of preparing the regenerated polyester fiber specifically includes the following steps:

[0027] S3.1: Collect various discarded plastic bottles, sort them by material, manually remove the caps and labels from polyethylene terephthalate plastic bottles, and place them in a cleaning tank filled with a plastic detergent at a concentration of 3-5%. Use ultrasonic cleaning equipment, set the cleaning time to 1-2 hours, and control the cleaning temperature at 40-50°C.

[0028] S3.2: The cleaned plastic bottles are taken out and placed in a drying device for drying. The dried plastic bottles are placed in a grinder for crushing. The crushed plastic particles are screened by a screening device to obtain plastic particles with a particle size of 0.2-0.5 mm.

[0029] S3.3: The screened plastic particles are fed into a melting device at a melting temperature of 270-280°C. After the plastic particles are completely melted, 3-5 wt% of a plasticizer, 2-3 wt% of a stabilizer, and 5-8 wt% of a polyelectrolyte flame retardant are added and stirred evenly. The plastic melt is then maintained in the melting device for 2-3 hours to obtain a molten plastic melt.

[0030] S3.4: The molten plastic melt is sent into the spinning machine through a metering pump for spinning molding. The spinning speed of the spinning machine is set to 200-300m / min, the spinning pressure is adjusted to 20-25MPa, and the spinneret aperture is selected to be 15-20μm. The plastic melt is extruded through the spinneret to form a filament, cooled and solidified in the air, and then stretched and heat-set to obtain regenerated polyester fiber.

[0031] Furthermore, step S4 of preparing the compounded flame retardant specifically includes the following steps:

[0032] S4.1: Add 20-30 parts by weight of starch to 250-300 parts by weight of deionized water, add 1-2 parts by weight of 2.4 mol / L hydrochloric acid with mechanical stirring, and react at 40-45°C for 4-5 hours. Then, cool to room temperature, filter, wash the filter cake with distilled water, and dry at 40-50°C to constant weight to obtain hydrolyzed starch;

[0033] S4.2: Add 10-12 parts by weight of the phytic acid solution to 10-12 parts by weight of deionized water, stir and mix, then add sodium carbonate to adjust the pH to neutral to obtain a phytic acid mixed solution;

[0034] S4.3: Add 10-12 parts by weight of hydrolyzed starch to 20-30 parts by weight of deionized water, stir and mix, then add the above-mentioned phytic acid mixed solution dropwise, then react at 45-50°C for 5-6 hours, cool to room temperature, filter, wash and dry to obtain phytic acid starch ester, and mix the phytic acid starch ester with ammonium polyphosphate in a mass ratio of 1:1 to obtain a compound flame retardant.

[0035] Furthermore, step S5 of preparing the environmentally friendly antibacterial flame-retardant fabric specifically includes the following steps:

[0036] S5.1: Prepare 0.5 M Tris buffer, add dopamine hydrochloride powder to the Tris buffer solution to prepare a dopamine buffer solution with an amine concentration of 2.5-3 mmol / L, place the regenerated polyester fiber in the dopamine buffer solution, and shake in a water bath at 30-35°C for 20-24 hours to obtain dopamine-modified regenerated polyester fiber;

[0037] S5.2: Prepare a 40-50 mmol / L nanosilver solution, place the dopamine-modified regenerated polyester fiber in the nanosilver solution, and shake in a 30-35°C water bath for 20-24 hours to obtain the antibacterial regenerated polyester fiber;

[0038] S5.3: Add 5-8 parts by weight of the compound flame retardant to 30-50 parts by weight of deionized water, and then react with magnetic stirring at 40-50°C for 30-40 minutes to obtain a flame retardant finishing solution;

[0039] S5.4: Immerse the antibacterial regenerated polyester fiber in a flame retardant finishing solution at room temperature for 40-50 minutes, then ultrasonically clean the fiber in an ultrasonic cleaning machine for 15-20 minutes. After completion, bake the antibacterial regenerated polyester fiber in a vacuum drying oven at 70-80°C for 1-2 hours to obtain the antibacterial flame retardant regenerated polyester fiber.

[0040] S5.5: The antibacterial and flame-retardant recycled polyester fiber is fed into a loom for weaving. After weaving is completed, the fiber is inspected and sorted to remove surface hair and defects to obtain an environmentally friendly antibacterial and flame-retardant fabric.

[0041] Furthermore, the plasticizer in step S3.2 is dioctyl phthalate.

[0042] Furthermore, in step S3.3, the stabilizer is calcium stearate.

[0043] Furthermore, in step S4.1, the starch is potato starch.

[0044] The invention discloses a use of environmentally friendly fabric prepared by a process of preparing environmentally friendly fabric using recycled plastic bottles, wherein the environmentally friendly fabric is used for preparing fire-fighting clothing.

[0045] Compared with the prior art, the present invention has at least the following beneficial effects:

[0046] 1. The present invention prepares a plastic cleaning agent for cleaning recycled plastic bottles. The plastic cleaning agent prepared by the present invention has good decontamination and emulsification capabilities, can effectively remove various stains on the plastic surface, such as oil stains, dust, etc., and improve the cleanliness of the plastic. In addition, antibacterial adsorption microspheres are added, which have a good adsorption effect on stains, impurities, etc. on the plastic surface, which helps to improve the cleaning effect. It can adsorb and remove pollutants such as tiny particles and organic matter on the plastic surface, making the plastic surface cleaner. Due to the addition of nisin and specially treated mussel shell powder, the antibacterial adsorption microspheres prepared are added to the cleaning agent, which can effectively inhibit the growth and reproduction of bacteria on the plastic surface, have good antibacterial effect, reduce the cumbersome steps of using multiple single-function cleaning agents, and improve cleaning efficiency and quality.

[0047] 2. The present invention adds a polyelectrolyte flame retardant during the preparation of regenerated polyester fiber. The sodium pyrophosphate in the polyelectrolyte flame retardant contains multiple phosphate ions. The phosphate ions can decompose to produce metaphosphoric acid and other substances when heated, which can promote the dehydration and carbonization of the material surface to form a dense carbon layer. The high molecular chain structure of chitosan will interact with the formed carbon layer during the combustion process, enhance the stability of the carbon layer, thereby preventing the transfer of heat and oxygen, playing a flame retardant effect, and improving the self-extinguishing performance of the regenerated polyester fiber. In addition, the amino groups in chitosan and the phosphate ions in sodium pyrophosphate can undergo ionic bonding and other interactions to form a polyelectrolyte structure, so that it forms a stable network structure inside the fiber, thereby enhancing the thermal stability and anti-aging performance of the regenerated polyester fiber and extending its service life. The selected chitosan and sodium pyrophosphate are both relatively environmentally friendly substances. Compared with traditional halogen or phosphorus flame retardants, they reduce the release of harmful substances and meet the requirements of modern green production.

[0048] 3. The present invention forms a polydopamine film on the surface of the recycled polyester fiber, and uses dopamine to load nano-silver particles, which gives the recycled polyester fiber antibacterial properties, can effectively kill and inhibit bacterial growth, and ensure the hygienic safety of the fabric during long-term use. After that, it is impregnated and baked with a flame retardant finishing liquid. The ammonium polyphosphate in the compound flame retardant will decompose and produce ammonia and phosphoric acid and other substances when heated. Ammonia can dilute the oxygen concentration in the surrounding air and play a role in inhibiting combustion. Phosphoric acid can promote the dehydration and carbonization of the material surface to form a carbon layer. Hydrolyzed starch and phytic acid starch fat can form The carbon layer of phytic acid starch grease can further enhance the stability of the carbon layer formed by ammonium polyphosphate, and the substances produced by the decomposition of ammonium polyphosphate can also enhance the flame retardant effect of phytic acid starch grease. Therefore, the use of compound flame retardants provides multiple flame retardant mechanisms for recycled polyester fibers, effectively inhibiting the spread of flames, reducing the heat release rate, and improving the fire safety of materials. The use of bio-based material potato starch as one of the flame retardant components and the use of environmentally friendly self-polymerization to form a polydopamine film reduce the harmful substances that may be contained in traditional flame retardants and antibacterial agents, which meets the requirements of sustainable development and environmental protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] The accompanying drawings, which are incorporated herein and constitute a part of the specification, illustrate embodiments of the invention and, together with the description, further serve to explain the principles of the invention and to enable one skilled in the art to make and use the invention.

[0050] Figure 1 This is a process flow chart for preparing environmentally friendly fabrics using recycled plastic bottles, as adopted in an embodiment of the present invention. DETAILED DESCRIPTION

[0051] The following describes in detail, with reference to the accompanying drawings and specific embodiments, a process for producing environmentally friendly fabric from recycled plastic bottles, as provided by the present invention. It is also noted that, for the sake of completeness, the following embodiments are best and preferred, and those skilled in the art may employ alternative methods for implementing known techniques. Furthermore, the accompanying drawings are intended only to provide a more detailed description of the embodiments and are not intended to limit the present invention.

[0052] Example 1

[0053] A process for making environmentally friendly fabrics from recycled plastic bottles, such as Figure 1 As shown, the following steps are included:

[0054] S1: Preparation of plastic cleaning agent

[0055] S1.1: Clean discarded mussel shells, remove any remaining shell flesh, soak them in 0.5% dilute hydrochloric acid for 30 minutes, rinse with distilled water, dry and crush, and pass through a 100-mesh sieve. Place the sieved shell powder in a muffle furnace and calcine at 1000°C for 3 hours to obtain calcined mussel shell powder;

[0056] S1.2: Add 0.2 parts by weight of calcined mussel shell powder and 3 parts by weight of nisin to 100 parts by weight of a 5% chitosan aqueous solution, stir and mix thoroughly to obtain a mixed solution, and slowly add the mixed solution dropwise to a 5% calcium chloride aqueous solution using a syringe to form a crude antimicrobial adsorption microsphere product;

[0057] S1.3: The crude antibacterial adsorbent microspheres were washed twice with distilled water, then immersed in a 0.5 mol / L chloroacetic acid solution and adjusted to pH 8 with a 0.1 mol / L sodium hydroxide solution. After curing for 10 h, the antibacterial adsorbent microspheres were washed again with distilled water until neutral, and dried to obtain the antibacterial adsorbent microspheres.

[0058] S1.4: 10 parts by weight of sodium sulfate decahydrate, 1 part by weight of fatty alcohol polyoxyethylene ether, 1 part by weight of sodium lauryl sulfate, 3 parts by weight of sodium percarbonate, 3 parts by weight of sodium perborate, 5 parts by weight of citric acid, 15 parts by weight of sodium ethylenediaminetetraacetate, and 10 parts by weight of antibacterial adsorbent microspheres are mixed and dispersed with stirring, and the mixture is heated to 50° C. and kept warm for 0.5 h at a stirring speed of 100 rpm to obtain a plastic cleaning agent;

[0059] S2: Preparation of polyelectrolyte flame retardant

[0060] S2.1: Add 4 parts by weight of chitosan to 300 parts by weight of deionized water, stir and mix, then add 4 parts by weight of glacial acetic acid, and stir at 60°C for 1 hour to obtain mixed solution I;

[0061] S2.2: 5 parts by weight of sodium pyrophosphate was added to 300 parts by weight of deionized water, and ultrasonically mixed for 20 minutes. Glacial acetic acid was then added to adjust the pH to neutral to obtain a mixed solution II.

[0062] S2.3: Mixed solution I and mixed solution II were placed in a constant pressure dropping funnel respectively, and added dropwise at a uniform rate to 100 parts by weight of deionized water at 40°C, with continuous magnetic stirring during the addition. After the addition was completed, stirring was continued for 1 hour, and the product was filtered to obtain the product. The product was washed with deionized water and dried to obtain a polyelectrolyte flame retardant;

[0063] S3: Preparation of recycled polyester fiber

[0064] S3.1: Collect various discarded plastic bottles, sort them by material, manually remove the caps and labels from polyethylene terephthalate plastic bottles, and place them in a cleaning tank filled with a 3% concentration of plastic detergent. Start an ultrasonic cleaning device, set the cleaning time to 1 hour, and control the cleaning temperature at 40°C.

[0065] S3.2: The cleaned plastic bottles are taken out and placed in a drying device for drying. The dried plastic bottles are placed in a grinder for crushing. The crushed plastic particles are screened through a screening device to obtain plastic particles with a particle size of 0.2 mm.

[0066] S3.3: The screened plastic particles are fed into a melting device at a melting temperature of 270°C. After the plastic particles are completely melted, 3 wt% of a plasticizer (dioctyl phthalate), 2 wt% of a stabilizer (calcium stearate), and 5 wt% of a polyelectrolyte flame retardant are added and stirred evenly. The plastic melt is then maintained in the melting device for 2 hours to obtain a molten plastic melt.

[0067] S3.4: The molten plastic melt is fed into a spinning machine via a metering pump for spinning. The spinning speed of the spinning machine is set to 200 m / min, the spinning pressure is adjusted to 20 MPa, and the spinneret aperture is selected to be 15 μm. The plastic melt is extruded through the spinneret to form filaments, cooled and solidified in air, and then stretched and heat-set to obtain regenerated polyester fibers.

[0068] S4: Preparation of compound flame retardant

[0069] S4.1: 20 parts by weight of potato starch were added to 250 parts by weight of deionized water. 1 part by weight of 2.4 mol / L hydrochloric acid was added with mechanical stirring. The mixture was reacted at 40°C for 4 h. The mixture was then cooled to room temperature and filtered. The filter cake was washed with distilled water and dried at 40°C to constant weight to obtain hydrolyzed starch.

[0070] S4.2: Add 10 parts by weight of the phytic acid solution to 10 parts by weight of deionized water, stir and mix, then add sodium carbonate to adjust the pH to neutral to obtain a phytic acid mixed solution;

[0071] S4.3: Add 10 parts by weight of hydrolyzed starch to 20 parts by weight of deionized water, stir and mix, then add the above phytic acid mixed solution dropwise, then react at 45°C for 5 hours, cool to room temperature, filter, wash, and dry to obtain phytic acid starch ester. The phytic acid starch ester and ammonium polyphosphate are mixed in a mass ratio of 1:1 to obtain a composite flame retardant;

[0072] S5: Preparation of environmentally friendly antibacterial and flame-retardant fabrics

[0073] S5.1: Prepare 0.5 M Tris buffer, add dopamine hydrochloride powder to the Tris buffer solution to prepare a dopamine buffer solution with an amine concentration of 2.5 mmol / L, place the regenerated polyester fiber in the dopamine buffer solution, and shake in a 30°C water bath for 20 hours to obtain dopamine-modified regenerated polyester fiber;

[0074] S5.2: Prepare a 40 mmol / L nanosilver solution, place the dopamine-modified regenerated polyester fiber in the nanosilver solution, and shake in a 30°C water bath for 20 hours to obtain the antibacterial regenerated polyester fiber;

[0075] S5.3: Add 5 parts by weight of the compound flame retardant to 30 parts by weight of deionized water, and react with magnetic stirring at 40°C for 30 minutes to obtain a flame retardant finishing solution;

[0076] S5.4: Immersing the antibacterial regenerated polyester fiber in a flame retardant finishing solution at room temperature for 40 minutes, then ultrasonically cleaning the fiber in an ultrasonic cleaning machine for 15 minutes. After completion, the antibacterial regenerated polyester fiber is placed in a vacuum drying oven and baked at 70°C for 1 hour to obtain the antibacterial flame retardant regenerated polyester fiber.

[0077] S5.5: The antibacterial and flame-retardant recycled polyester fiber is fed into a loom for weaving. After weaving is completed, the fiber is inspected and sorted to remove surface hair and defects to obtain an environmentally friendly antibacterial and flame-retardant fabric.

[0078] Example 2

[0079] A process for making environmentally friendly fabrics from recycled plastic bottles, such as Figure 1 As shown, the following steps are included:

[0080] S1: Preparation of plastic cleaning agent

[0081] S1.1: Clean discarded mussel shells, remove any remaining shell flesh, soak them in 1% dilute hydrochloric acid for 30 minutes, rinse with distilled water, dry and crush, and pass through a 100-mesh sieve. Calcinate the sieved mussel shell powder in a muffle furnace at 1000°C for 3 hours to obtain calcined mussel shell powder.

[0082] S1.2: Add 0.3 parts by weight of calcined mussel shell powder and 5 parts by weight of nisin to 120 parts by weight of an 8% chitosan aqueous solution, stir and mix thoroughly to obtain a mixed solution, and slowly add the mixed solution dropwise to an 8% calcium chloride aqueous solution using a syringe to form a crude antimicrobial adsorption microsphere product;

[0083] S1.3: The crude antimicrobial adsorbent microspheres were washed twice with distilled water, then immersed in a 1 mol / L chloroacetic acid solution and adjusted to pH 9 with a 0.2 mol / L sodium hydroxide solution. After curing for 10 h, the antimicrobial adsorbent microspheres were washed again with distilled water until neutral, and dried to obtain the antimicrobial adsorbent microspheres.

[0084] S1.4: 12 parts by weight of sodium sulfate decahydrate, 3 parts by weight of fatty alcohol polyoxyethylene ether, 2 parts by weight of sodium lauryl sulfonate, 5 parts by weight of sodium percarbonate, 5 parts by weight of sodium perborate, 8 parts by weight of citric acid, 20 parts by weight of sodium ethylenediaminetetraacetate, and 12 parts by weight of antibacterial adsorbent microspheres were mixed and dispersed with stirring, and the mixture was heated to 50° C. and kept warm for 0.5 h at a stirring speed of 100 rpm to obtain a plastic cleaning agent;

[0085] S2: Preparation of polyelectrolyte flame retardant

[0086] S2.1: Add 5 parts by weight of chitosan to 400 parts by weight of deionized water, stir and mix, then add 5 parts by weight of glacial acetic acid, and stir at 60°C for 1 hour to obtain mixed solution I;

[0087] S2.2: 8 parts by weight of sodium pyrophosphate was added to 400 parts by weight of deionized water, and ultrasonically mixed for 20 minutes. Then, glacial acetic acid was added to adjust the pH to neutral to obtain a mixed solution II.

[0088] S2.3: Mixed solution I and mixed solution II were placed in a constant pressure dropping funnel respectively, and added dropwise at a uniform rate to 120 parts by weight of deionized water at 40°C, with continuous magnetic stirring during the addition. After the addition was completed, stirring was continued for 1 hour, and the product was filtered to obtain the product. The product was washed with deionized water and dried to obtain a polyelectrolyte flame retardant;

[0089] S3: Preparation of recycled polyester fiber

[0090] S3.1: Collect various discarded plastic bottles, sort them by material, manually remove the caps and labels from polyethylene terephthalate plastic bottles, and place them in a cleaning tank filled with a 5% concentration of plastic detergent. Start an ultrasonic cleaning machine, set the cleaning time to 1 hour, and control the cleaning temperature at 40°C.

[0091] S3.2: The cleaned plastic bottles are taken out and placed in a drying device for drying. The dried plastic bottles are placed in a grinder for crushing. The crushed plastic particles are screened through a screening device to obtain plastic particles with a particle size of 0.2 mm.

[0092] S3.3: The screened plastic particles are fed into a melting device at a melting temperature of 270°C. After the plastic particles are completely melted, 5 wt% of a plasticizer (dioctyl phthalate), 3 wt% of a stabilizer (calcium stearate), and 8 wt% of a polyelectrolyte flame retardant are added and stirred evenly. The plastic melt is then maintained in the melting device for 2 hours to obtain a molten plastic melt.

[0093] S3.4: The molten plastic melt is fed into a spinning machine via a metering pump for spinning. The spinning speed of the spinning machine is set to 200 m / min, the spinning pressure is adjusted to 20 MPa, and the spinneret aperture is selected to be 15 μm. The plastic melt is extruded through the spinneret to form filaments, cooled and solidified in air, and then stretched and heat-set to obtain regenerated polyester fibers.

[0094] S4: Preparation of compound flame retardant

[0095] S4.1: 30 parts by weight of potato starch were added to 300 parts by weight of deionized water, and 1-2 parts by weight of 2.4 mol / L hydrochloric acid were added with mechanical stirring at 40°C for 4 hours. The mixture was then cooled to room temperature and filtered. The filter cake was washed with distilled water and dried at 40°C to constant weight to obtain hydrolyzed starch.

[0096] S4.2: 12 parts by weight of the phytic acid solution was added to 12 parts by weight of deionized water, and the mixture was stirred and mixed, and then sodium carbonate was added to adjust the pH to neutral to obtain a phytic acid mixed solution;

[0097] S4.3: Add 12 parts by weight of hydrolyzed starch to 30 parts by weight of deionized water, stir and mix, then add the above phytic acid mixed solution dropwise, then react at 45°C for 5 hours, cool to room temperature, filter, wash, and dry to obtain phytic acid starch ester. The phytic acid starch ester and ammonium polyphosphate are mixed in a mass ratio of 1:1 to obtain a composite flame retardant;

[0098] S5: Preparation of environmentally friendly antibacterial and flame-retardant fabrics

[0099] S5.1: Prepare 0.5 M Tris buffer, add dopamine hydrochloride powder to the Tris buffer solution to prepare a dopamine buffer solution with an amine concentration of 3 mmol / L, place the regenerated polyester fiber in the dopamine buffer solution, and shake in a 30°C water bath for 20 hours to obtain dopamine-modified regenerated polyester fiber;

[0100] S5.2: Prepare a 50 mmol / L nanosilver solution, place the dopamine-modified regenerated polyester fiber in the nanosilver solution, and shake in a 30°C water bath for 20 hours to obtain the antibacterial regenerated polyester fiber;

[0101] S5.3: Add 8 parts by weight of the compound flame retardant to 50 parts by weight of deionized water, and then react with magnetic stirring at 40°C for 30 minutes to obtain a flame retardant finishing solution;

[0102] S5.4: Immersing the antibacterial regenerated polyester fiber in a flame retardant finishing solution at room temperature for 40 minutes, then ultrasonically cleaning the fiber in an ultrasonic cleaning machine for 15 minutes. After completion, the antibacterial regenerated polyester fiber is placed in a vacuum drying oven and baked at 70°C for 1 hour to obtain the antibacterial flame retardant regenerated polyester fiber.

[0103] S5.5: The antibacterial and flame-retardant recycled polyester fiber is fed into a loom for weaving. After weaving is completed, the fiber is inspected and sorted to remove surface hair and defects to obtain an environmentally friendly antibacterial and flame-retardant fabric.

[0104] Example 3

[0105] A process for making environmentally friendly fabrics from recycled plastic bottles, such as Figure 1 As shown, the following steps are included:

[0106] S1: Preparation of plastic cleaning agent

[0107] S1.1: Clean discarded mussel shells, remove any remaining shell flesh, and soak them in 0.5% dilute hydrochloric acid for 35 minutes. Rinse with distilled water, dry and crush, and pass through a 100-mesh sieve. Calcining the sieved mussel shell powder in a muffle furnace at 1200°C for 4 hours yields calcined mussel shell powder.

[0108] S1.2: Add 0.2 parts by weight of calcined mussel shell powder and 3 parts by weight of nisin to 100 parts by weight of a 5% chitosan aqueous solution, stir and mix thoroughly to obtain a mixed solution, and slowly add the mixed solution dropwise to a 5% calcium chloride aqueous solution using a syringe to form a crude antimicrobial adsorption microsphere product;

[0109] S1.3: The crude antimicrobial adsorbent microspheres were washed three times with distilled water, then immersed in a 0.5 mol / L chloroacetic acid solution and adjusted to pH 8 with a 0.2 mol / L sodium hydroxide solution. After curing for 12 h, the solution was washed again with distilled water until neutral, and dried to obtain the antimicrobial adsorbent microspheres.

[0110] S1.4: 10 parts by weight of sodium sulfate decahydrate, 1 part by weight of fatty alcohol polyoxyethylene ether, 1 part by weight of sodium lauryl sulfate, 3 parts by weight of sodium percarbonate, 3 parts by weight of sodium perborate, 5 parts by weight of citric acid, 15 parts by weight of sodium ethylenediaminetetraacetate, and 10 parts by weight of antibacterial adsorbent microspheres are mixed and dispersed with stirring, and the mixture is heated to 60° C. and kept warm for 3 h at a stirring speed of 200 rpm to obtain a plastic cleaning agent;

[0111] S2: Preparation of polyelectrolyte flame retardant

[0112] S2.1: Add 4 parts by weight of chitosan to 300 parts by weight of deionized water, stir and mix, then add 4 parts by weight of glacial acetic acid, and stir at 65°C for 2 hours to obtain mixed solution I;

[0113] S2.2: 5 parts by weight of sodium pyrophosphate was added to 300 parts by weight of deionized water, and ultrasonically mixed for 30 minutes. Glacial acetic acid was then added to adjust the pH to neutral to obtain a mixed solution II.

[0114] S2.3: Mixed solution I and mixed solution II were placed in a constant pressure dropping funnel respectively, and uniformly added dropwise to 100 parts by weight of deionized water at 45°C with continuous magnetic stirring during the addition. After the addition was completed, stirring was continued for 2 hours, and the product was filtered to obtain a product. The product was washed with deionized water and dried to obtain a polyelectrolyte flame retardant;

[0115] S3: Preparation of recycled polyester fiber

[0116] S3.1: Collect various discarded plastic bottles, sort them by material, manually remove the caps and labels from polyethylene terephthalate plastic bottles, and place them in a cleaning tank filled with a 3% concentration of plastic detergent. Start an ultrasonic cleaning machine, set the cleaning time to 2 hours, and control the cleaning temperature at 50°C.

[0117] S3.2: The cleaned plastic bottles are removed and placed in a drying device for drying. The dried plastic bottles are placed in a grinder for crushing. The crushed plastic particles are screened through a screening device to obtain plastic particles with a particle size of 0.5 mm.

[0118] S3.3: The screened plastic particles are fed into a melting device at a melting temperature of 280°C. After the plastic particles are completely melted, 3 wt% of a plasticizer (dioctyl phthalate), 2 wt% of a stabilizer (calcium stearate), and 5 wt% of a polyelectrolyte flame retardant are added and stirred evenly. The plastic melt is then maintained in the melting device for 3 hours to obtain a molten plastic melt.

[0119] S3.4: The molten plastic melt is fed into a spinning machine via a metering pump for spinning. The spinning speed of the spinning machine is set to 300 m / min, the spinning pressure is adjusted to 25 MPa, and the spinneret aperture is selected to be 20 μm. The plastic melt is extruded through the spinneret to form filaments, cooled and solidified in air, and then stretched and heat-set to obtain regenerated polyester fibers.

[0120] S4: Preparation of compound flame retardant

[0121] S4.1: 20 parts by weight of potato starch were added to 250 parts by weight of deionized water. 1 part by weight of 2.4 mol / L hydrochloric acid was added with mechanical stirring. The mixture was reacted at 45°C for 5 h. The mixture was then cooled to room temperature and filtered. The filter cake was washed with distilled water and dried at 50°C to constant weight to obtain hydrolyzed starch.

[0122] S4.2: Add 10 parts by weight of the phytic acid solution to 10 parts by weight of deionized water, stir and mix, then add sodium carbonate to adjust the pH to neutral to obtain a phytic acid mixed solution;

[0123] S4.3: Add 12 parts by weight of hydrolyzed starch to 20 parts by weight of deionized water, stir and mix, then add the above phytic acid mixed solution dropwise, then react at 50°C for 6 hours, cool to room temperature, filter, wash, and dry to obtain phytic acid starch ester, and mix the phytic acid starch ester with ammonium polyphosphate in a mass ratio of 1:1 to obtain a composite flame retardant;

[0124] S5: Preparation of environmentally friendly antibacterial and flame-retardant fabrics

[0125] S5.1: Prepare 0.5 M Tris buffer, add dopamine hydrochloride powder to the Tris buffer solution to prepare a dopamine buffer solution with an amine concentration of 2.5 mmol / L, place the regenerated polyester fiber in the dopamine buffer solution, and shake in a 35°C water bath for 24 hours to obtain dopamine-modified regenerated polyester fiber;

[0126] S5.2: Prepare a 40 mmol / L nanosilver solution, place the dopamine-modified regenerated polyester fiber in the nanosilver solution, and shake in a 35°C water bath for 24 hours to obtain the antibacterial regenerated polyester fiber;

[0127] S5.3: Add 5 parts by weight of the compound flame retardant to 30 parts by weight of deionized water, and react at 50°C with magnetic stirring for 40 minutes to obtain a flame retardant finishing solution;

[0128] S5.4: Immersing the antibacterial regenerated polyester fiber in a flame retardant finishing solution at room temperature for 50 minutes, then ultrasonically cleaning the fiber in an ultrasonic cleaning machine for 20 minutes. After the cleaning, the antibacterial regenerated polyester fiber is baked in a vacuum drying oven at 80°C for 2 hours to obtain the antibacterial flame retardant regenerated polyester fiber.

[0129] S5.5: The antibacterial and flame-retardant recycled polyester fiber is fed into a loom for weaving. After weaving is completed, the fiber is inspected and sorted to remove surface hair and defects to obtain an environmentally friendly antibacterial and flame-retardant fabric.

[0130] The environmentally friendly antibacterial and flame-retardant fabrics of Examples 1-3 were subjected to performance tests. The test results are shown in Table 1.

[0131] Antibacterial test: According to the test method GB / T20944.3-2008 "Evaluation of antibacterial properties of textiles Part 3: Oscillation method", the number of colonies was recorded to calculate the antibacterial rate.

[0132] Table 1. Antibacterial performance test results of Examples 1-3

[0133] Antibacterial rate (%) Example 1 99.93 Example 2 99.89 Example 3 99.91

[0134] Flame retardancy test: According to GB / T5455-2014 “Fire performance of textiles - Determination of vertical damage length, smoldering and afterflaming time”, record the afterflaming, smoldering time and damage length of each sample.

[0135] Table 2. Flame retardant performance test results of Examples 1-3

[0136] Afterburning time (s) Smoldering time (s) Damaged length (cm) Example 1 0 0 4.8 Example 2 0 0 5.3 Example 3 0 0 5.1

[0137] Antistatic performance test: Use the YG(B)406 fabric resistivity tester to measure the surface resistance of the environmentally friendly antibacterial flame retardant fabric.

[0138] The surface resistance value R is substituted into the formula ρ = R × L / ω to obtain the surface resistivity of the environmentally friendly antibacterial flame-retardant fabric (L represents the effective circumference of the protected electrode 0.16m, ω represents the distance between the two electrodes 0.02m).

[0139] Table 3. Antistatic performance test results of Examples 1-3

[0140] Surface resistivity (Ω) Example 1 <![CDATA[8.84×10 8 ]]> Example 2 <![CDATA[8.86×10 8 ]]> Example 3 <![CDATA[8.87×10 8 ]]>

[0141] Air permeability test: The air permeability test was conducted using the YG461E-III fully automatic air permeability meter based on EN ISO 9237-1995 “Determination of air permeability of textile fiber fabrics”.

[0142] Table 4. Breathability test results of Examples 1-3

[0143] Air permeability (mm / s) Example 1 2198.3 Example 2 2093.4 Example 3 2120.3

[0144] Washability test: Washability testing was performed according to AATCC 61-2013, Color Fastness to Washing: Accelerated Method (Method 2A). After each wash cycle, the sample was rinsed with distilled water at 40°C and then tested for antimicrobial properties.

[0145] Table 5. Test results of washability of Examples 1-3

[0146] Antibacterial rate after 4 washes (%) Example 1 90.96 Example 2 89.59 Example 3 90.36

[0147] It can be seen from the data in Tables 1 to 5 that the environmentally friendly, antibacterial and flame-retardant fabric prepared by the present invention has good comprehensive performance and is a multifunctional fabric that combines protection and comfort while using green and environmentally friendly materials.

[0148] Comparative Example 1

[0149] Compared with Example 1, the difference of Comparative Example 1 is that the polyelectrolyte flame retardant in step S2 and step S3.3 is removed in Comparative Example 1, and the other steps remain unchanged to prepare the environmentally friendly antibacterial flame retardant fabric, which is recorded as Comparative Example 1.

[0150] Comparative Example 2

[0151] Compared with Example 1, the difference of Comparative Example 2 is that Comparative Example 2 removes step S4 and steps S5.3-S5.4, replaces the antibacterial flame retardant regenerated polyester fiber in step S5.5 with antibacterial regenerated polyester fiber, and the other steps remain unchanged to prepare an environmentally friendly antibacterial flame retardant fabric, which is recorded as Comparative Example 2.

[0152] The data of Example 1 was used to carry out flame retardancy test on Comparative Examples 1-2. The test results are shown in Table 6.

[0153] Table 6. Flame retardant performance test results of Example 1 and Comparative Examples 1-2

[0154] Afterburning time (s) Smoldering time (s) Damaged length (cm) Example 1 0 0 4.8 Comparative Example 1 0.7 1.4 8.2 Comparative Example 2 1.2 1.9 10.3

[0155] It can be seen from the data in Table 6 that the present invention can effectively inhibit the combustion process of regenerated polyester fibers by adding polyelectrolyte flame retardants, and through the use of compound flame retardants, multiple flame retardant mechanisms are provided for regenerated polyester fibers, which further effectively inhibit the spread of flames. Through the dual effects of polyelectrolyte flame retardants and compound flame retardants, the flame retardant properties of environmentally friendly antibacterial flame retardant fabrics are effectively improved.

[0156] Comparative Example 3

[0157] Compared with Example 1, the difference of Comparative Example 3 is that Comparative Example 3 removes steps S5.1-S5.2, replaces the antibacterial regenerated polyester fiber in step S5.4 with regenerated polyester fiber, and the other steps remain unchanged to prepare the environmentally friendly antibacterial flame-retardant fabric, which is recorded as Comparative Example 3.

[0158] The data of Example 1 was used to test the antibacterial performance of Comparative Example 3. The test results are shown in Table 7.

[0159] Table 7. Antibacterial performance test results of Example 1 and Comparative Example 3

[0160] Antibacterial rate (%) Example 1 99.93 Comparative Example 3 68.39

[0161] From the data in Table 7, it can be seen that a polydopamine film is self-polymerized on the surface of the recycled polyester fiber, and the dopamine is used to load the nanosilver particles, giving the environmentally friendly antibacterial and flame-retardant fabric antibacterial properties.

[0162] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed herein are intended to be covered by the claims of the present invention.

Claims

1. A process for preparing environmentally friendly fabrics using recycled plastic bottles, characterized in that: The steps include: S1: Preparation of plastic cleaning agent Antibacterial adsorption microspheres are prepared using calcined mussel shell powder, nisin and chitosan as raw materials, and 10-12 parts by weight of sodium sulfate decahydrate, 1-3 parts by weight of fatty alcohol polyoxyethylene ether, 1-2 parts by weight of sodium lauryl sulfonate, 3-5 parts by weight of sodium percarbonate, 3-5 parts by weight of sodium perborate, 5-8 parts by weight of citric acid, 15-20 parts by weight of sodium ethylenediaminetetraacetate and 10-12 parts by weight of the antibacterial adsorption microspheres are mixed to prepare a plastic cleaning agent; S2: Preparation of polyelectrolyte flame retardant A polyelectrolyte flame retardant was prepared using chitosan, sodium pyrophosphate and glacial acetic acid as raw materials. S3: Preparation of recycled polyester fiber The cleaned plastic bottles are crushed to obtain plastic particles, which are melted and added with plasticizers, stabilizers and polyelectrolyte flame retardants, and then spun to obtain recycled polyester fibers; S4: Preparation of compound flame retardant hydrolyzing starch under acidic conditions, then mixing the hydrolyzed starch with a phytic acid solution, and mixing the resulting reactant with ammonium polyphosphate to obtain a composite flame retardant; S5: Preparation of environmentally friendly antibacterial and flame-retardant fabrics Recycled polyester fibers are modified with dopamine and then placed in a nanosilver solution to obtain antibacterial regenerated polyester fibers. The antibacterial regenerated polyester fibers are immersed in a flame retardant finishing solution at room temperature and then baked to obtain antibacterial flame retardant regenerated polyester fibers. The antibacterial flame retardant regenerated polyester fibers are fed into a loom for weaving to obtain environmentally friendly antibacterial flame retardant fabrics.

2. The process for preparing environmentally friendly fabrics from recycled plastic bottles according to claim 1, characterized in that: Step S1: Preparation of plastic cleaning agent, specifically comprising the following steps: S1.1: Clean discarded mussel shells, remove any remaining shell flesh, and soak them in 0.5-1% dilute hydrochloric acid for 30-35 minutes. Rinse with distilled water, dry and crush, and pass through a 100-mesh sieve. Calcining the sieved mussel shell powder in a muffle furnace at 1000-1200°C for 3-4 hours to obtain calcined mussel shell powder. S1.2: Add 0.2-0.3 parts by weight of calcined mussel shell powder and 3-5 parts by weight of nisin to 100-120 parts by weight of a 5-8% chitosan aqueous solution, stir and mix thoroughly to obtain a mixed solution, and slowly add the mixed solution dropwise to a 5-8% calcium chloride aqueous solution using a syringe to form a crude antimicrobial adsorption microsphere product; S1.3: Wash the crude antibacterial adsorbent microspheres with distilled water 2-3 times, then immerse the antibacterial adsorbent microspheres in a 0.5-1 mol / L chloroacetic acid solution and adjust the pH to 8-9 with a 0.1-0.2 mol / L sodium hydroxide solution. After curing for 10-12 hours, wash again with distilled water until neutral, and dry to obtain the antibacterial adsorbent microspheres. S1.4: Mix 10-12 parts by weight of sodium sulfate decahydrate, 1-3 parts by weight of fatty alcohol polyoxyethylene ether, 1-2 parts by weight of sodium lauryl sulfonate, 3-5 parts by weight of sodium percarbonate, 3-5 parts by weight of sodium perborate, 5-8 parts by weight of citric acid, 15-20 parts by weight of sodium ethylenediaminetetraacetate and 10-12 parts by weight of antibacterial adsorption microspheres, stir and disperse, heat to 50-60°C, keep warm for 0.5-3h, and stir at a speed of 100-200r / min to obtain a plastic cleaning agent.

3. The process for preparing environmentally friendly fabrics from recycled plastic bottles according to claim 1, characterized in that: Step S2: Preparation of polyelectrolyte flame retardant, specifically comprising the following steps: S2.1: Add 4-5 parts by weight of chitosan to 300-400 parts by weight of deionized water, stir and mix, then add 4-5 parts by weight of glacial acetic acid, and stir at 60-65°C for 1-2 hours to obtain mixed solution I; S2.2: Add 5-8 parts by weight of sodium pyrophosphate to 300-400 parts by weight of deionized water, mix by ultrasonication for 20-30 minutes, and then adjust the pH to neutral by adding glacial acetic acid to obtain mixed solution II; S2.3: Place mixed solution I and mixed solution II in a constant pressure dropping funnel respectively, and add them dropwise at a uniform rate into 100-120 parts by weight of deionized water at 40-45°C. Continuously perform magnetic stirring during the addition process. After the addition is completed, continue stirring for 1-2 hours, filter to obtain the product, wash the product with deionized water, and dry it to obtain a polyelectrolyte flame retardant.

4. The process for preparing environmentally friendly fabrics from recycled plastic bottles according to claim 1, characterized in that: Step S3, preparation of regenerated polyester fiber, specifically comprises the following steps: S3.1: Collect various discarded plastic bottles, sort them by material, manually remove the caps and labels from polyethylene terephthalate plastic bottles, and place them in a cleaning tank filled with a plastic detergent at a concentration of 3-5%. Use ultrasonic cleaning equipment, set the cleaning time to 1-2 hours, and control the cleaning temperature at 40-50°C. S3.2: The cleaned plastic bottles are taken out and placed in a drying device for drying. The dried plastic bottles are placed in a grinder for crushing. The crushed plastic particles are screened by a screening device to obtain plastic particles with a particle size of 0.2-0.5 mm. S3.3: The screened plastic particles are fed into a melting device at a melting temperature of 270-280°C. After the plastic particles are completely melted, 3-5 wt% of a plasticizer, 2-3 wt% of a stabilizer, and 5-8 wt% of a polyelectrolyte flame retardant are added and stirred evenly. The plastic melt is then maintained in the melting device for 2-3 hours to obtain a molten plastic melt. S3.4: The molten plastic melt is sent into the spinning machine through a metering pump for spinning molding. The spinning speed of the spinning machine is set to 200-300m / min, the spinning pressure is adjusted to 20-25MPa, and the spinneret aperture is selected to be 15-20μm. The plastic melt is extruded through the spinneret to form a filament, cooled and solidified in the air, and then stretched and heat-set to obtain regenerated polyester fiber.

5. The process for preparing environmentally friendly fabrics from recycled plastic bottles according to claim 1, characterized in that: Step S4 is the preparation of the compounded flame retardant, which specifically includes the following steps: S4.1: Add 20-30 parts by weight of starch to 250-300 parts by weight of deionized water, add 1-2 parts by weight of 2.4 mol / L hydrochloric acid with mechanical stirring, and react at 40-45°C for 4-5 hours. Then, cool to room temperature, filter, wash the filter cake with distilled water, and dry at 40-50°C to constant weight to obtain hydrolyzed starch; S4.2: Add 10-12 parts by weight of the phytic acid solution to 10-12 parts by weight of deionized water, stir and mix, then add sodium carbonate to adjust the pH to neutral to obtain a phytic acid mixed solution; S4.3: Add 10-12 parts by weight of hydrolyzed starch to 20-30 parts by weight of deionized water, stir and mix, then add the above-mentioned phytic acid mixed solution dropwise, then react at 45-50°C for 5-6 hours, cool to room temperature, filter, wash and dry to obtain phytic acid starch ester, and mix the phytic acid starch ester with ammonium polyphosphate in a mass ratio of 1:1 to obtain a compound flame retardant.

6. The process for preparing environmentally friendly fabrics from recycled plastic bottles according to claim 1, characterized in that: Step S5 is the preparation of the environmentally friendly antibacterial flame-retardant fabric, which specifically includes the following steps: S5.1: Prepare 0.5 M Tris buffer, add dopamine hydrochloride powder to the Tris buffer solution to prepare a dopamine buffer solution with an amine concentration of 2.5-3 mmol / L, place the regenerated polyester fiber in the dopamine buffer solution, and shake in a water bath at 30-35°C for 20-24 hours to obtain dopamine-modified regenerated polyester fiber; S5.2: Prepare a 40-50 mmol / L nanosilver solution, place the dopamine-modified regenerated polyester fiber in the nanosilver solution, and shake in a 30-35°C water bath for 20-24 hours to obtain the antibacterial regenerated polyester fiber; S5.3: Add 5-8 parts by weight of the compound flame retardant to 30-50 parts by weight of deionized water, and then react with magnetic stirring at 40-50°C for 30-40 minutes to obtain a flame retardant finishing solution; S5.4: Immerse the antibacterial regenerated polyester fiber in a flame retardant finishing solution at room temperature for 40-50 minutes, then ultrasonically clean the fiber in an ultrasonic cleaning machine for 15-20 minutes. After completion, bake the antibacterial regenerated polyester fiber in a vacuum drying oven at 70-80°C for 1-2 hours to obtain the antibacterial flame retardant regenerated polyester fiber. S5.5: The antibacterial and flame-retardant recycled polyester fiber is fed into a loom for weaving. After weaving is completed, the fiber is inspected and sorted to remove surface hair and defects to obtain an environmentally friendly antibacterial and flame-retardant fabric.

7. The process for preparing environmentally friendly fabrics from recycled plastic bottles according to claim 4, characterized in that: The plasticizer in step S3.2 is dioctyl phthalate.

8. The process for preparing environmentally friendly fabrics from recycled plastic bottles according to claim 4, characterized in that: The stabilizer in step S3.3 is calcium stearate.

9. The process for preparing environmentally friendly fabrics from recycled plastic bottles according to claim 5, characterized in that: The starch in step S4.1 is potato starch.

10. Use of the environmentally friendly fabric prepared by the process for preparing environmentally friendly fabric using recycled plastic bottles according to claims 1-9, characterized in that: The environmentally friendly fabric is used for preparing fire-fighting clothing.

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