Antibacterial fabric for luggage and method for manufacturing the same

Abstract

The application discloses an antibacterial fabric for bags and a preparation method thereof, and belongs to the technical field of functional composite materials.The fabric raw materials comprise, by weight, 70-100 parts of polyester fabric base cloth, 1-5 parts of polyethylene imine, 5-20 parts of PVC resin powder, 0.5-3 parts of polyhexamethylene guanidine hydrochloride, 0.1-0.5 parts of a penetrating agent and 1-5 parts of a cross-linking agent.The base cloth is pretreated with polyethylene imine, the PVC film casting solution containing the antibacterial agent is scraped on the surface of the base cloth, the base cloth is pre-dried, then is immersed into a multi-functional epoxy cross-linking agent bath to perform cross-linking anchoring, and after washing and drying, the antibacterial fabric for bags is obtained.Compared with the prior art, the antibacterial bag fabric has excellent antibacterial durability and washing resistance, and still has a high efficient bacteriostatic effect after multiple washing operations.Meanwhile, the polyvinyl chloride film layer is firmly combined with the base cloth, the peeling strength is obviously improved, the polyvinyl chloride film layer is not easy to delaminate and fall off in the repeated bending and use process, and the comprehensive requirements of durability and practicability of the bag product can be met.

Description

Technical Field

[0001] This invention relates to the field of functional composite materials technology, and in particular to an antibacterial fabric for bags and a method for preparing the same. Background Technology

[0002] As the main material for luggage products, the performance of the fabric directly affects the lifespan of the luggage and the user experience. In recent years, with the increasing attention consumers pay to health and hygiene, luggage fabrics with antibacterial functions have gradually become the focus of market attention. Polyvinyl chloride (PVC) synthetic leather fabric is widely used in the luggage manufacturing industry due to its excellent mechanical properties, weather resistance, and ease of processing and molding. To endow PVC luggage fabric with antibacterial function, existing technologies usually involve coating the fabric surface with a finishing liquid containing antibacterial agents such as silver ions, quaternary ammonium salts, or guanidines, or directly blending the antibacterial agent with PVC resin before molding. However, these methods generally suffer from weak adhesion between the antibacterial components and the substrate. In daily use, after repeated friction and washing, the antibacterial agent easily migrates and is lost from the surface or shallow layers of the fabric, resulting in a rapid decline in the antibacterial effect, making it difficult to meet the requirements of luggage products for long-lasting antibacterial performance. Therefore, how to achieve long-term stable fixation of antibacterial components in the substrate while maintaining the original excellent properties of PVC fabric has become a technical bottleneck that urgently needs to be overcome in this field.

[0003] Patent CN117261383A discloses an aging-resistant bag fabric and its preparation method. This patent involves blending polyethyleneimine and PVC to form a film, using water in an aqueous solution of polyethyleneimine as a pore-forming agent to create a porous structure, then loading titanium dioxide and dimercaptobenzimidazole onto the film surface using a sol-gel method, and finally using epichlorohydrin as a crosslinking agent to fix the functional components in the film layer, thus giving the fabric aging resistance. This technical solution mainly focuses on the aging resistance function, and its loaded functional components are ultraviolet shielding agents and absorbers, without involving the realization of antibacterial functions. Patent CN116252525A discloses an antibacterial and wear-resistant textile fabric and its preparation method, employing a multi-layered base fabric composite structure, using chitin fibers and nano-silver as antibacterial components, and achieving a combination of antibacterial and wear-resistant properties through the stacking of three different functional layers (inner, middle, and outer). The multi-layered structure of this scheme makes the preparation process complex and the production cost high. Furthermore, the high cost of nano-silver as an antibacterial component, the potential for oxidation and discoloration with long-term use, and the potential impact of the cumulative release of silver ions on the ecological environment limit its application and promotion to a certain extent.

[0004] In summary, current antibacterial bag fabrics lack an effective chemical fixation mechanism between the antibacterial components and the fabric substrate, relying mostly on physical adsorption or simple blending, resulting in insufficient antibacterial durability. Some solutions use crosslinking agents with toxicity or environmental risks, which is inconsistent with the development trend of ecological safety in textiles. Multi-layer composite or complex processing steps increase manufacturing costs and process control difficulties. Therefore, there is an urgent need to develop a simple, environmentally friendly method for preparing bag fabrics that can achieve long-term fixation of antibacterial components, while also ensuring excellent antibacterial properties, washability, and good interfacial bonding strength. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention aims to provide an antibacterial fabric for bags and a method for preparing the same.

[0006] To achieve the above-mentioned objectives, the present invention adopts the following technical solution: An antibacterial fabric for bags and luggage comprises the following raw materials in parts by weight: 70-100 parts polyester fabric base, 1-5 parts polyethyleneimine, 5-20 parts PVC resin powder, 60-100 parts N,N-dimethylformamide, 0.5-3 parts polyhexamethylene guanidine hydrochloride, 0.1-0.5 parts penetrant, 1-5 parts crosslinking agent, 60-100 parts anhydrous ethanol and 90-200 parts water.

[0007] The penetrant is at least one of fatty alcohol polyoxyethylene ether, isopropanol, ethylene glycol butyl ether, and sodium secondary alkyl sulfate.

[0008] The crosslinking agent is at least one of 1,4-butanediol diglycidyl ether, ethylene glycol diglycidyl ether, 1,6-hexanediol diglycidyl ether, polyethylene glycol diglycidyl ether, 1,4-cyclohexanediethanol diglycidyl ether, neopentyl glycol diglycidyl ether, trimethylolpropane triglycidyl ether, resorcinol diglycidyl ether, and polypropylene glycol diglycidyl ether.

[0009] Preferably, the crosslinking agent is composed of neopentyl glycol diglycidyl ether and trimethylolpropane triglycidyl ether in a mass ratio of 0.5-2:0.5-2.

[0010] More preferably, the crosslinking agent is composed of neopentyl glycol diglycidyl ether, trimethylolpropane triglycidyl ether, and polypropylene glycol diglycidyl ether in a mass ratio of 0.5-2:0.5-2:0.2-0.6.

[0011] A method for preparing an antibacterial bag fabric is as follows: Step 1: Immerse the polyester fabric base in a pretreatment solution composed of polyethyleneimine, anhydrous ethanol and water, perform two dips and two squeezes, and dry to obtain the pretreated base fabric. Step 2: Add PVC resin powder to N,N-dimethylformamide and stir until completely dissolved to obtain a PVC solution; separately add polyhexamethylene guanidine hydrochloride to water to obtain a polyhexamethylene guanidine hydrochloride aqueous solution. While stirring continuously, add the polyhexamethylene guanidine hydrochloride aqueous solution and the polyethyleneimine aqueous solution dropwise to the PVC solution. After the addition is complete, add a penetrant, continue stirring, and degas under vacuum to obtain an antibacterial PVC casting solution. Step 3: Apply the antibacterial PVC casting liquid obtained in Step 2 evenly to the surface of the pretreated base fabric obtained in Step 1 using a scraper; then pre-dry the coated base fabric to obtain a pre-dried coated base fabric. Step 4: Immerse the pre-dried coated base fabric obtained in Step 3 into a crosslinking bath composed of crosslinking agent, anhydrous ethanol and water, adjust the pH, heat the fabric, remove it and wash it thoroughly with water, and dry it to constant weight to obtain antibacterial bag fabric.

[0012] The rolling allowance in step 1 is 70-80%.

[0013] The drying in step 1 is performed at 60-90℃.

[0014] The step 2 of stirring until completely dissolved means stirring at 50-70℃ and 100-500 rpm until completely dissolved.

[0015] The dropping rate in step 2 is 0.3-0.8 mL / min.

[0016] The polyethyleneimine aqueous solution added in step 2 has a mass fraction of 10-20%.

[0017] The thickness of the wet film applied in step 3 is 100-300 μm.

[0018] The pre-drying in step 3 is to pre-dry at 60-90℃ for 5-20 minutes.

[0019] In step 4, the pH is adjusted to 8-9 using sodium carbonate.

[0020] The heat treatment in step 4 is performed at 40-60℃ for 1-8 hours.

[0021] The drying to constant weight in step 4 is to dry at 50-80℃ to constant weight.

[0022] This invention reveals that when existing bag fabrics are given antibacterial properties, the antibacterial components are mostly attached to the surface or shallow layer of the fabric through simple padding or coating, lacking an effective fixation mechanism. Under repeated washing and mechanical friction during use, the antibacterial components are prone to migration or loss, resulting in insufficient antibacterial durability of the fabric.

[0023] To address the aforementioned issues, this invention employs pre-introducing polyethyleneimine, rich in primary and secondary amine groups, as reaction sites on the surface of the polyester base fabric and within the PVC film layer. Then, an irreversible epoxy ring-opening-amine addition reaction is carried out between the polyethyleneimine and a crosslinking agent containing multifunctional epoxy groups, constructing a three-dimensional covalent crosslinked network within the film layer and at the film-base fabric interface. This network physically embeds and confines polyhexamethylene guanidine hydrochloride, which possesses broad-spectrum antibacterial activity, within the mesh structure, effectively reducing the risk of loss of antibacterial components during washing, thereby endowing the bag fabric with long-lasting antibacterial properties.

[0024] Furthermore, this invention has found that single crosslinking agents often struggle to balance the efficient confinement of antibacterial components with the required flexibility of the network when constructing a network. To overcome this contradiction, this invention employs a compound of structurally complementary multifunctional epoxy crosslinking agents, enabling the crosslinked network to simultaneously possess a high-density confined framework and adequate chain segment movement space. This improves both the embedding strength of antibacterial components and the interfacial bonding between the film layer and the base fabric. Building upon this, by further introducing crosslinking components containing flexible long-chain polyether structures, the network topology is optimized at multiple levels, further enhancing the antibacterial durability and peel strength of the fabric.

[0025] Compared with the prior art, the present invention has the following beneficial technical effects: 1) This invention forms a covalent cross-linking network between a multifunctional epoxy cross-linking agent and polyethyleneimine, which firmly embeds the antibacterial components in a three-dimensional structure, effectively solving the problem of easy loss of antibacterial components during washing and significantly improving the antibacterial durability of the fabric.

[0026] 2) This invention utilizes a cross-linked network to form a chemical anchoring connection at the interface between the film layer and the base fabric, which enhances the interfacial bonding force between the PVC film layer and the polyester base fabric, allowing the fabric to maintain good interlayer strength under repeated use and bending conditions.

[0027] 3) This invention uses a combination of multifunctional crosslinking agents with complementary structures to ensure high crosslinking density while giving the network appropriate flexibility and deformation recovery ability, so that the fabric has both excellent dimensional stability and folding resistance.

[0028] 4) This invention uses polyvinyl chloride as the film-forming matrix and constructs a three-dimensional covalent network in situ in the polyvinyl chloride film layer by using polyethyleneimine and a multifunctional epoxy crosslinking agent. This stably embeds the antibacterial components in the polyvinyl chloride material, effectively delaying the migration and loss of the antibacterial components and giving the polyvinyl chloride composite fabric a long-lasting antibacterial property. Detailed Implementation

[0029] The present invention will be further described below with reference to specific embodiments, so that those skilled in the art can better understand and implement the present invention, but the embodiments are not intended to limit the present invention.

[0030] The specific details of the raw materials used in the embodiments of the present invention are as follows: Polyester fabric base: Plain weave Oxford cloth made of 840D×840D polyester filament, with a warp and weft density of 30×26 threads / inch and a weight of 190-195g / m². 2 148cm wide.

[0031] Polyethyleneimine: CAS: 9002-98-6, branched polyethyleneimine, weight average molecular weight approximately 3000, industrial grade, content ≥99% (based on anhydrous solids).

[0032] PVC resin powder: Polyvinyl chloride resin, CAS: 9002-86-2, grade SG-5, average degree of polymerization 1000-1100, K value 66-68, apparent density ≥0.45g / mL, volatile content ≤0.40%, whiteness ≥74%, conforming to GB / T5761-2018.

[0033] Polyhexamethylene guanidine hydrochloride: CAS: 57028-96-3, number average molecular weight 800-1500, purity ≥99%, industrial grade.

[0034] Fatty alcohol polyoxyethylene ether: nonionic surfactant, CAS: 68439-50-9, industrial general grade JFC, industrial grade, content ≥99%.

[0035] 1,4-Butanediol diglycidyl ether: CAS: 2425-79-8, industrial grade, purity ≥99%.

[0036] Ethylene glycol diglycidyl ether: CAS: 2224-15-9, industrial grade, purity ≥99%.

[0037] 1,6-Hexanediol diglycidyl ether: CAS: 16096-31-4, industrial grade, purity ≥98%, epoxy value 0.65-0.70 eq / 100g.

[0038] Polyethylene glycol diglycidyl ether: CAS: 39443-66-8, industrial grade, purity ≥95%, number average molecular weight approximately 400.

[0039] 1,4-Cyclohexanediethanol diglycidyl ether: CAS: 14228-73-0, industrial grade, purity ≥99%, viscosity at 25℃ 45-75 mPa·s, epoxy value 0.60-0.64 eq / 100g.

[0040] Neopentyl glycol diglycidyl ether: CAS: 17557-23-2, industrial grade, purity ≥99%.

[0041] Trimethylolpropane triglycidyl ether: CAS: 30499-70-8, industrial grade, epoxy value approximately 0.7 eq / 100g.

[0042] Resorcinol diglycidyl ether: CAS: 101-90-6, industrial grade, purity ≥94%.

[0043] Polypropylene glycol diglycidyl ether: CAS: 26142-30-3, industrial grade, number average molecular weight approximately 600, purity ≥95%, epoxy value 0.30-0.35 eq / 100g.

[0044] In the embodiments and comparative examples of this invention, all raw materials are commercially available products.

[0045] Example 1

[0046] The preparation method of an antibacterial bag fabric is as follows, in parts by weight: Step 1: Immerse 85 parts of polyester fabric base fabric in a pretreatment solution composed of 2 parts polyethyleneimine, 20 parts anhydrous ethanol and 78 parts water, perform two dips and two squeezes, with a squeeze-out rate of 75%, and dry at 80°C to obtain the pretreated base fabric. Step 2: Add 12 parts of PVC resin powder to 80 parts of N,N-dimethylformamide and stir at 300 rpm at 60℃ until completely dissolved to obtain a PVC solution; separately add 1.5 parts of polyhexamethylene guanidine hydrochloride to 5 parts of water to obtain a polyhexamethylene guanidine hydrochloride aqueous solution. At the same time, prepare 2 parts of a 15% (w / w) polyethyleneimine aqueous solution. Under continuous stirring, add the polyhexamethylene guanidine hydrochloride aqueous solution and the polyethyleneimine aqueous solution dropwise to the PVC solution at a dropping rate of 0.5 mL / min. After the dropping is completed, add 0.2 parts of fatty alcohol polyoxyethylene ether and continue stirring for 30 min. Vacuum degassing is then performed to obtain the antibacterial PVC casting solution. Step 3: Lay the pretreated base fabric obtained in Step 1 flat on a clean glass plate, and apply the casting solution obtained in Step 2 evenly to the surface of the base fabric with a scraper, controlling the wet film thickness to be 180 μm; then place the coated base fabric in a forced-air drying oven and pre-dry it at 80°C for 12 min to obtain the pre-dried coated base fabric. Step 4: Immerse the pre-dried coated base fabric obtained in Step 3 into a crosslinking bath consisting of 3 parts crosslinking agent, 60 parts anhydrous ethanol and 40 parts water, adjust the pH to 8.5 with sodium carbonate, treat at 45°C for 3 hours, remove and wash thoroughly with water, and dry at 60°C to constant weight to obtain antibacterial bag fabric.

[0047] The crosslinking agent is 1,4-butanediol diglycidyl ether.

[0048] Example 2

[0049] The preparation method of an antibacterial bag fabric is basically the same as that in Example 1, except that the crosslinking agent is ethylene glycol diglycidyl ether.

[0050] Example 3

[0051] The preparation method of an antibacterial bag fabric is basically the same as that in Example 1, except that the crosslinking agent is 1,6-hexanediol diglycidyl ether.

[0052] Example 4

[0053] The preparation method of an antibacterial bag fabric is basically the same as that in Example 1, except that the crosslinking agent is polyethylene glycol diglycidyl ether.

[0054] Example 5

[0055] The preparation method of an antibacterial bag fabric is basically the same as that in Example 1, except that the crosslinking agent is 1,4-cyclohexanediethanol diglycidyl ether.

[0056] Example 6

[0057] The preparation method of an antibacterial bag fabric is basically the same as that in Example 1, except that the crosslinking agent is neopentyl glycol diglycidyl ether.

[0058] Example 7

[0059] The preparation method of an antibacterial bag fabric is basically the same as that in Example 1, except that the crosslinking agent is trimethylolpropane triglycidyl ether.

[0060] Example 8

[0061] The preparation method of an antibacterial bag fabric is basically the same as that in Example 1, except that the crosslinking agent is resorcinol diglycidyl ether.

[0062] Example 9

[0063] The preparation method of an antibacterial bag fabric is basically the same as that in Example 1, except that the crosslinking agent is composed of neopentyl glycol diglycidyl ether and trimethylolpropane triglycidyl ether in a mass ratio of 1:1.

[0064] Example 10

[0065] The preparation method of an antibacterial bag fabric is basically the same as that in Example 1, except that the crosslinking agent is composed of 1,4-butanediol diglycidyl ether and 1,6-hexanediol diglycidyl ether in a mass ratio of 1:1.

[0066] Example 11

[0067] The preparation method of an antibacterial bag fabric is basically the same as that in Example 9, except that the crosslinking agent is composed of neopentyl glycol diglycidyl ether, trimethylolpropane triglycidyl ether, and polypropylene glycol diglycidyl ether in a mass ratio of 1:1:0.4.

[0068] Comparative Example 1 The preparation method of an antibacterial bag fabric is basically the same as that in Example 1, except that the crosslinking agent is epichlorohydrin.

[0069] Comparative Example 2 The preparation method of an antibacterial bag fabric is basically the same as that in Example 1, except that the crosslinking agent is not added.

[0070] Test Example 1 Antibacterial performance test before and after washing: Antibacterial bag fabric samples prepared in each embodiment and comparative example were taken, cut into fragments that met the test requirements, and 0.75±0.05g was weighed as one sample. Three parallel samples were taken for each sample. Antibacterial performance was tested according to GB / T 20944.3-2008 "Evaluation of Antibacterial Properties of Textiles Part 3: Shaking Method". The test bacteria were Staphylococcus aureus ATCC 6538 and Escherichia coli ATCC 25922. The samples were contacted with a bacterial solution of known concentration at 24℃±1℃ and 150r / min for 18h with shaking. The bacterial solution was then serially diluted and viable bacteria were counted. The inhibition rate was calculated using the following formula: Inhibition rate (%) = [(Number of viable bacteria after shaking of blank control sample - Number of viable bacteria after shaking of sample) / Number of viable bacteria after shaking of blank control sample] × 100% The wash resistance test was conducted according to the washing method in GB / T 8629-2017 "Test Procedures for Household Washing and Drying of Textiles". The samples were washed 50 times at 40℃±2℃, with thorough rinsing and drying after each wash. The antibacterial rate of the samples after 50 washes was tested using the same method. The antibacterial rate after 50 washes was used as the indicator for evaluating antibacterial durability.

[0071] The test results are shown in Table 1.

[0072] Table 1

[0073] Test Example 2 Membrane-backed fabric peel strength test: Antibacterial bag fabric samples prepared in each embodiment and comparative example were cut into rectangular strips with a length of 150 mm and a width of 25 mm. Three parallel samples were taken from each sample. Referring to GB / T 8808-1988 "Peel Test Method for Flexible Composite Plastic Materials", the PVC film layer was manually pre-peeled from the base fabric by about 30 mm at one end of the sample. The pre-peeled film layer end and the base fabric end were clamped in the upper and lower clamps of an electronic universal testing machine, with the clamp spacing set at 50 mm. Peeling was performed at a constant tensile speed of 200 mm / min, and the force value during the peeling process was continuously recorded. The average peel force in the stable section of the peel curve was taken, and the peel strength was obtained by dividing the peel force (N) by the sample width (25 mm), with the unit being N / mm. The arithmetic mean of the three parallel samples was taken as the final peel strength value to characterize the bonding strength between the film layer and the base fabric. The higher the peel strength, the better the cross-linking anchoring effect. The relevant test data are summarized in Table 2.

[0074] Table 2

[0075] In this invention, Comparative Example 2 did not add a crosslinking agent. Polyethylene imine and polyhexamethylene guanidine hydrochloride were only physically attached to the film layer. After repeated washing, a large amount of antibacterial components were lost, leading to a sharp decrease in the antibacterial rate after washing. Examples 1-8 introduced a multifunctional epoxy crosslinking agent, which underwent an irreversible epoxy ring-opening-amine addition reaction with the primary and secondary amines of polyethyleneimine, forming a three-dimensional covalent crosslinking network. Through physical embedding and intermolecular interactions, the retention rate of the antibacterial components was significantly improved, resulting in a significantly better antibacterial effect after washing compared to Comparative Example 2. In Examples 1-8, Example 7 used trimethylolpropane triglycidyl ether as a trifunctional crosslinking agent. Its three epoxy end groups can simultaneously connect three polyethyleneimine molecular chains, resulting in a high crosslinking node density and strong network constraint, thus exhibiting superior antibacterial durability after washing. In Comparative Example 1, epichlorohydrin was used as a crosslinking agent. Although it could crosslink with polyethyleneimine, the resulting bridge chains were extremely short and rigid, lacking flexible segments for energy dissipation. This led to interfacial stress concentration in the film under stress, resulting in relatively low peel strength. In contrast, Example 6 used neopentyl glycol diglycidyl ether. Its bifunctional structure, combined with the steric hindrance effect introduced by the neopentyl glycol structure and certain flexible segments, allowed the crosslinked network to maintain appropriate constraint while providing sufficient space for segment movement and deformation recovery, effectively alleviating interfacial stress. Therefore, it exhibited superior peel strength among all single crosslinking agents.

[0076] Example 9 uses a compound of neopentyl glycol diglycidyl ether and trimethylolpropane triglycidyl ether in a specific ratio to form a topologically complementary structure between crosslinking density and network flexibility. Trimethylolpropane triglycidyl ether provides a high-density constrained framework with triaxially branched nodes, ensuring the strong encapsulation of antibacterial components; neopentyl glycol diglycidyl ether, with its bifunctional segments embedded in the framework, increases the deformability of the network through its steric structure, preventing embrittlement due to excessive density. The synergistic effect of the two components gives the network both high constraint and good interfacial stress dissipation ability. Therefore, the antibacterial rate and peel strength after washing in Example 9 are far superior to either single component, exhibiting a synergistic effect. In contrast, Example 10 uses a compound of butanediol diglycidyl ether and hexanediol diglycidyl ether. Both are linear aliphatic bifunctional epoxy crosslinking agents with similar reaction mechanisms. After compounding, the main effect is chain length regulation, with limited improvement.

[0077] Example 11 further introduces polypropylene glycol diglycidyl ether (PPDD) based on Example 9. Its long-chain polyether backbone contains freely rotating ether bonds and side methyl groups, enabling the formation of extended, elastic segments within the crosslinked network. In the high-density constrained framework established in Example 9, the long-range flexible chains of PPDD act as elastic hinges, further reducing the internal stress of the network and enhancing the energy dissipation and deformation recovery capabilities of the film during bending and peeling, thereby further improving the peel strength on top of the existing synergistic effect. Simultaneously, the introduction of long polyether chains moderately increases the accommodating space of the network microregions, potentially facilitating the uniform distribution and retention of antibacterial components within the crosslinked structure.

Claims

1. An antibacterial fabric for bags and luggage, characterized in that, Including the following parts by weight of raw materials: 70-100 parts polyester fabric base, 1-5 parts polyethyleneimine, 5-20 parts PVC resin powder, 60-100 parts N,N-dimethylformamide, 0.5-3 parts polyhexamethylene guanidine hydrochloride, 0.1-0.5 parts penetrant, 1-5 parts crosslinking agent, 60-100 parts anhydrous ethanol and 90-200 parts water.

2. The antibacterial fabric for bags as described in claim 1, characterized in that, The penetrant is at least one of fatty alcohol polyoxyethylene ether, isopropanol, ethylene glycol butyl ether, and sodium secondary alkyl sulfate.

3. The antibacterial fabric for bags as described in claim 1, characterized in that, The crosslinking agent is at least one of 1,4-butanediol diglycidyl ether, ethylene glycol diglycidyl ether, 1,6-hexanediol diglycidyl ether, polyethylene glycol diglycidyl ether, 1,4-cyclohexanediethanol diglycidyl ether, neopentyl glycol diglycidyl ether, trimethylolpropane triglycidyl ether, resorcinol diglycidyl ether, and polypropylene glycol diglycidyl ether.

4. The antibacterial fabric for bags as described in claim 1, characterized in that, The crosslinking agent is composed of neopentyl glycol diglycidyl ether and trimethylolpropane triglycidyl ether in a mass ratio of 0.5-2:0.5-2.

5. The antibacterial fabric for bags as described in claim 1, characterized in that, The crosslinking agent is composed of neopentyl glycol diglycidyl ether, trimethylolpropane triglycidyl ether, and polypropylene glycol diglycidyl ether in a mass ratio of 0.5-2:0.5-2:0.2-0.

6.

6. A method for preparing an antibacterial fabric for bags as described in any one of claims 1-5, characterized in that, The method is as follows: Step 1: Immerse the polyester fabric base in a pretreatment solution composed of polyethyleneimine, anhydrous ethanol and water, perform two dips and two squeezes, and dry to obtain the pretreated base fabric. Step 2: Add PVC resin powder to N,N-dimethylformamide and stir until completely dissolved to obtain a PVC solution; separately add polyhexamethylene guanidine hydrochloride to water to obtain a polyhexamethylene guanidine hydrochloride aqueous solution. While stirring continuously, add the polyhexamethylene guanidine hydrochloride aqueous solution and the polyethyleneimine aqueous solution dropwise to the PVC solution. After the addition is complete, add a penetrant, continue stirring, and degas under vacuum to obtain an antibacterial PVC casting solution. Step 3: Apply the antibacterial PVC casting liquid obtained in Step 2 evenly to the surface of the pretreated base fabric obtained in Step 1 using a scraper; then pre-dry the coated base fabric to obtain a pre-dried coated base fabric. Step 4: Immerse the pre-dried coated base fabric obtained in Step 3 into a crosslinking bath composed of crosslinking agent, anhydrous ethanol and water, adjust the pH, heat the fabric, remove it and wash it thoroughly with water, and dry it to constant weight to obtain antibacterial bag fabric.

7. The method as described in claim 6, characterized in that, In step 1, the rolling residue rate is 70-80%; drying is carried out at 60-90℃.

8. The method as described in claim 6, characterized in that, In step 2, stirring until completely dissolved means stirring at 50-70℃ and 100-500 rpm until completely dissolved; the dropping rate is 0.3-0.8 mL / min; and the mass fraction of the added polyethyleneimine aqueous solution is 10-20%.

9. The method as described in claim 6, characterized in that, In step 3, the thickness of the wet film applied by scraping is 100-300 μm; pre-drying is carried out at 60-90℃ for 5-20 min.

10. The method as described in claim 6, characterized in that, In step 4, pH is adjusted to 8-9 using sodium carbonate; heat treatment is performed at 40-60℃ for 1-8 hours; and drying to constant weight is performed at 50-80℃ to constant weight.

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