Knitted bag processing method and knitted bag thereof

Abstract

The invention belongs to the technical field of knitted bags, and particularly relates to a knitted bag processing method and a knitted bag thereof.The knitted bag processing method comprises the following steps that S1, a first knitted material and a second knitted material for the knitted bag are selected, the first knitted material is soaked in a first functional treatment solution, and the second knitted material is soaked in a second functional treatment solution; s2, drying the first knitted material and the second knitted material which are impregnated; s3, the dried first knitting material is used for knitting of the bottom area of the knitted bag, the dried second knitting material is used for knitting of the side face area of the knitted bag, and a knitted bag body with the zoning function characteristic is obtained through integrated forming. According to the difference of use requirements of different parts of the knitted bag, two kinds of functional treatment liquid are adopted for carrying out differentiation treatment on bottom and side face materials, and integrated functional partition of bottom strengthening wear resistance and side face emphasized protection is achieved. According to the design, the overall portability and breathability are guaranteed, and meanwhile the durability and the easy-to-care performance of all the areas are improved in a targeted mode.

Description

Technical Field

[0001] This invention belongs to the field of knitted bag technology, and particularly relates to a knitted bag processing method and a knitted bag thereof. Background Technology

[0002] Knitted bags, as a fashionable and casual item, are beloved by consumers for their unique textures, excellent breathability, and diverse designs. However, traditional knitted materials (such as cotton yarn, polyester yarn, and blended yarns) generally suffer from two inherent drawbacks: 1. Limited mechanical properties, particularly insufficient abrasion resistance and tear resistance; 2. Their hydrophilic nature, making them prone to absorbing stains. These defects severely restrict the durability and practicality of knitted bags in daily life and outdoor settings. Summary of the Invention

[0003] The purpose of this invention is to provide a method for processing knitted bags and a knitted bag thereof, which aims to solve the problems of insufficient abrasion resistance and tear resistance, self-hydrophilicity, and easy adsorption of stains in existing knitted bags.

[0004] To achieve the above objectives, the present invention provides a method for processing knitted bags, comprising the following steps: S1 selects a first knitted material and a second knitted material for woven bags, immerses the first knitted material in a first functional treatment liquid, and immerses the second knitted material in a second functional treatment liquid; S2. Dry the first and second knitted materials after impregnation; S3 uses the dried first knitting material for weaving the bottom area of ​​the knitted bag, and the dried second knitting material for weaving the side area of ​​the knitted bag. The knitted bag body with partitioned functional characteristics is obtained by using a flat knitting machine to form an integrated shape. The first functional treatment liquid comprises the following raw materials by mass percentage: 25-35% aqueous polyurethane dispersion, providing excellent toughness, wear resistance, and adhesion, which is the core of the enhanced function; 3-8% nano-silica, which significantly improves the hardness, wear resistance, and mechanical strength of the coating; 0.5-2% crosslinking agent, which promotes crosslinking between resin molecules to form a three-dimensional network structure, improving the water resistance and durability of the coating; 5-10% protective component, which provides enhanced function while imparting basic waterproof performance, achieving functional composite; 0.1-0.5% nonionic surfactant, which reduces the surface tension of the treatment liquid, allowing it to fully penetrate into the fiber interior; 0.2-1% thickener, which adjusts the viscosity of the treatment liquid to ensure that it can carry sufficient solids during impregnation, wherein the thickener is a polyurethane associative thickener, specifically BASF Rheovis PU1191; and the balance is deionized water.

[0005] The second functional treatment liquid comprises the following raw materials in weight percentage: 15-25% silicone-modified acrylic emulsion, providing a soft and elastic film with good adhesion and water resistance; 10-20% fluorine-free three-proof finishing agent, providing durable and excellent water, oil, and stain repellency (easy to clean), environmentally friendly and safe, the fluorine-free three-proof finishing agent being Daikin XF-5003 model finishing agent; 2-5% silicone elastomer, further enhancing the flexibility and resilience of the coating, adapting to frequent bending of knitted fabrics; 1-3% amino silicone oil emulsion, giving fibers a smooth and full hand feel, offsetting the stiffness that resin may bring; 0.1-0.5% nonionic surfactant, promoting uniform penetration and spreading of the treatment liquid; 0.1-0.8% catalyst, promoting cross-linking and curing of silicone components, improving durability; and the balance being deionized water.

[0006] In step S4, sew a zipper or button to the opening of the knitted bag body and attach a shoulder strap.

[0007] Optionally, the protective component includes one or a mixture of several of the following: fluoropolymers, silicone water repellents, wax emulsions, and environmentally friendly fluorine-free waterproofing agents.

[0008] Optionally, the first and second knitting materials are yarns or flat or tubular webbing formed through preliminary knitting. The yarns can be cotton yarn, polyester yarn, nylon yarn, blended yarn (such as cotton / polyester, cotton / spandex core-spun yarn), recycled fiber yarn, etc. These are the basic materials mentioned in the background art that require functional improvements. Similarly, transforming the yarn into flat or tubular webbing and then knitting it is also within the scope of this invention.

[0009] Optionally, in step S3, a dynamic pattern unit is provided on the side area of ​​the knitted bag; the dynamic pattern unit is woven from environmentally responsive yarn, which is a thermochromic yarn or a light-sensitive yarn.

[0010] Optionally, the crosslinking agent is an aziridine-based or a carbodiimide-based crosslinking agent. Specifically, an aziridine-based crosslinking agent may be crosslinking agent CX-100, and a carbodiimide-based crosslinking agent may be crosslinking agent of the Japanese Nisshinbo V-02 or E-02 type.

[0011] Optionally, the catalyst is an organotin or an amine catalyst. The organotin catalyst is dibutyltin dilaurate, and the amine catalyst is triethylamine, triethylenediamine, N,N-dimethylcyclohexylamine, bis(2-dimethylaminoethyl) ether, etc.

[0012] Optionally, the organosilicon elastomer is a crosslinkable organosilicon polymer that can undergo a condensation reaction under the action of the catalyst to form an elastic silicone rubber film. The organosilicon elastomer is a hydroxyl-terminated polydimethylsiloxane.

[0013] Optionally, the preparation method of the first functional treatment liquid includes the following steps: S11 involves premixing nano-silica with a portion of nonionic surfactant and a small amount of deionized water, and then pre-dispersing it for 10-15 minutes using a high-shear disperser at a speed of 2000-3000 rpm to form a uniform nano-silica pre-dispersion slurry. S12: Add approximately half the amount of deionized water to the main reactor and start stirring at a medium-low speed. Slowly add the aqueous polyurethane dispersion and stir for 10-15 minutes until homogeneous. While stirring, slowly add the nano-silica pre-dispersed slurry to the main reactor, increase the speed to 1200-1500 rpm, and continue dispersing for 25-35 minutes until the system is homogeneous and glossy. Then, adjust the speed back to 600-800 rpm, slowly add the protective component, and continue stirring for 15-20 minutes to ensure complete and uniform mixing. S13 Reduce the stirring speed to 300-500 rpm, and slowly add the crosslinking agent in a thin stream or dropwise while stirring well. Continue stirring for 20-30 minutes. Then, pre-dilute the thickener with deionized water and slowly add it to the system while stirring at low speed. Finally, adjust the stirring speed to 200-300 rpm and mature for 30 minutes to obtain the first functional treatment solution.

[0014] Optionally, the preparation method of the second functional treatment liquid includes the following steps: S21 mixes silicone elastomer, some nonionic surfactant and a small amount of deionized water, and pre-emulsifies it for 5-10 minutes at 2000-3000 rpm using a high-shear emulsifier to form a homogeneous silicone elastomer pre-emulsion with good flowability. S22 mixes the fluorine-free three-proof finishing agent and amino silicone oil emulsion evenly in another container to obtain a premixed solution; S23. Add about two-thirds of the formula volume of deionized water to the main reactor and stir at 300-500 rpm. Slowly add the silicone-modified acrylic emulsion and stir for 10-15 minutes. While stirring continuously, slowly drop the silicone elastomer pre-emulsion into the main reactor. After the drop is completed, increase the speed to 800-1000 rpm and continue to disperse for 15-20 minutes to fully mix and stabilize. S24 Adjust the stirring speed back to 600-800 rpm, slowly and evenly add the premixed liquid from step 2 into the system, and continue stirring for 20-25 minutes after the addition is complete to ensure complete mixing; S25 reduces the stirring speed to 300-400 rpm, fully dilutes the catalyst with deionized water, and slowly adds it to the system dropwise or in a thin stream. After the addition is complete, continue stirring for 15-20 minutes to ensure complete integration. Finally, adjust the stirring speed to 150-250 rpm and mature for 30 minutes to obtain the second functional treatment solution.

[0015] Optionally, a knitted bag is manufactured using the aforementioned knitted bag processing method.

[0016] The above-mentioned technical solutions in the knitted bag processing method provided by the embodiments of the present invention have at least one of the following technical effects: 1. Based on the different usage requirements of different parts of the knitted bag, two different functional treatment liquids are used to treat the bottom and side materials differently, achieving an integrated functional zone with a reinforced abrasion resistance bottom and a focus on protection on the sides. This design ensures overall lightweight breathability while specifically improving the durability and ease of care of each area, greatly expanding the applicability and lifespan of the knitted bag in various scenarios such as daily commuting and outdoor leisure.

[0017] 2. The bottom material of the bag is impregnated with a first functional treatment liquid with a specific ratio. The water-based polyurethane dispersion and nano-silica work synergistically to form a strong and tough composite protective film on the fiber surface, which greatly improves the wear resistance and tear resistance of the knitted material. This effectively overcomes the defects of insufficient mechanical properties of traditional knitted materials, so that the bottom of the bag can still maintain its structural integrity under frequent friction and load-bearing scenarios.

[0018] 3. The silicone-modified acrylic emulsion in the second functional treatment liquid works in conjunction with fluorine-free three-proof finishing agents, silicone elastomers and other components to build a low surface energy, hydrophobic and oleophobic protective layer on the surface of knitted materials. This gives the side areas of the bag excellent resistance to liquid wetting and stain adhesion. At the same time, the addition of amino silicone oil emulsion gives the fabric a soft feel, taking into account both functionality and comfort, and fundamentally improving the problem of knitted bags easily absorbing stains and being difficult to clean. Detailed Implementation

[0019] The present invention will be further described below with reference to embodiments, but the implementation of the present invention is not limited thereto.

[0020] Example 1 A method for processing a knitted bag, S1: Selecting a first knitted material and a second knitted material for knitting the bag, immersing the first knitted material in a first functional treatment liquid, and immersing the second knitted material in a second functional treatment liquid; S2 dries the first and second knitted materials after impregnation; S3 uses the dried first knitted material for weaving the bottom area of ​​the knitted bag, and the dried second knitted material for weaving the side area of ​​the knitted bag. A flat knitting machine is then used to integrally form the knitted bag body with zoned functional characteristics. The first functional treatment liquid comprises the following raw materials by mass percentage: 25% aqueous polyurethane dispersion, 3% nano-silica, 0.5% crosslinking agent, 5% protective component, 0.1% nonionic surfactant, 0.2% thickener, and 66.2% deionized water. The second functional treatment liquid comprises the following raw materials by mass percentage: 15% silicone-modified acrylic emulsion, 10% fluorine-free three-proof finishing agent, 2% silicone elastomer, 1% amino silicone oil emulsion, 0.1% nonionic surfactant, 0.1% catalyst, and 71.8% deionized water.

[0021] The protective components include a fluoropolymer, and the first and second knitted materials are yarns or flat or tubular webbing formed through preliminary knitting. In step S3, dynamic pattern units are provided on the side areas of the knitted package; the dynamic pattern units are woven from environmentally responsive yarns, which are thermochromic yarns. The crosslinking agent is an aziridine crosslinking agent, the catalyst is an organotin catalyst, and the organosilicon elastomer is a crosslinkable organosilicon polymer that can undergo a condensation reaction under the action of the catalyst to form an elastic silicone rubber film.

[0022] The preparation method of the first functional treatment liquid includes the following steps: S11 premixes nano-silica with some nonionic surfactant and a small amount of deionized water, and pre-disperses it for 10 minutes at 2000 rpm using a high-shear disperser to form a uniform nano-silica pre-dispersed slurry. S12: Add approximately half the amount of deionized water to the main reactor and start stirring at a medium-low speed. Slowly add the aqueous polyurethane dispersion and stir for 10 minutes until homogeneous. While stirring, slowly add the nano-silica pre-dispersed slurry to the main reactor, increase the speed to 1200 rpm, and continue dispersing for 25 minutes until the system is homogeneous and glossy. Then, adjust the speed back to 600 rpm, slowly add the protective component, and continue stirring for 15 minutes to ensure complete and uniform mixing. S13 Reduce the stirring speed to 300 rpm, and slowly add the crosslinking agent in a thin stream or dropwise while stirring well. Continue stirring for 20 minutes. Then, pre-dilute the thickener with deionized water and slowly add it to the system while stirring at low speed. Finally, adjust the stirring speed to 200 rpm and mature for 30 minutes to obtain the first functional treatment solution.

[0023] The preparation method of the second functional treatment liquid includes the following steps: S21 mixes silicone elastomer, some nonionic surfactant and a small amount of deionized water, and pre-emulsifies it for 5 minutes at 2000 rpm using a high-shear emulsifier to form a homogeneous silicone elastomer pre-emulsion with good flowability. S22 mixes the fluorine-free three-proof finishing agent and amino silicone oil emulsion evenly in another container to obtain a premixed solution; S23 Add about two-thirds of the formula amount of deionized water to the main reactor and stir at 300 rpm; slowly add silicone-modified acrylic emulsion and stir for 10 minutes. While stirring continuously, slowly add silicone elastomer pre-emulsion to the main reactor; after the addition is complete, increase the speed to 800 rpm and continue to disperse for 15 minutes to fully mix and stabilize. S24. Adjust the stirring speed back to 600 rpm, slowly and evenly add the premixed liquid from step 2 into the system, and continue stirring for 20 minutes after the addition is complete to ensure complete mixing. S25 reduces the stirring speed to 300 rpm, fully dilutes the catalyst with deionized water, and slowly adds it to the system dropwise or in a thin stream. After the addition is complete, continue stirring for 15-20 minutes to ensure complete integration. Finally, adjust the stirring speed to 150 rpm and mature for 30 minutes to obtain the second functional treatment solution.

[0024] Example 2 A method for processing a knitted bag, S1: Selecting a first knitted material and a second knitted material for knitting the bag, immersing the first knitted material in a first functional treatment liquid, and immersing the second knitted material in a second functional treatment liquid; S2 dries the first and second knitted materials after impregnation; S3 uses the dried first knitted material for weaving the bottom area of ​​the knitted bag, and the dried second knitted material for weaving the side area of ​​the knitted bag. A flat knitting machine is then used to integrally form the knitted bag body with zoned functional characteristics. The first functional treatment liquid comprises the following raw materials by mass percentage: 35% aqueous polyurethane dispersion, 8% nano-silica, 2% crosslinking agent, 10% protective component, 0.5% nonionic surfactant, 1% thickener, and 43.5% deionized water. The second functional treatment liquid comprises the following raw materials by mass percentage: 25% silicone-modified acrylic emulsion, 20% fluorine-free three-proof finishing agent, 5% silicone elastomer, 3% amino silicone oil emulsion, 0.5% nonionic surfactant, 0.8% catalyst, and 45.7% deionized water.

[0025] The protective components include an organosilicon water-repellent agent, and the first and second knitted materials are yarns and flat or tubular webbing formed by preliminary knitting. In step S3, dynamic pattern units are provided on the side area of ​​the knitted bag. The dynamic pattern units are woven from environmentally responsive yarns, which are photochromic yarns. The crosslinking agent is a carbodiimide crosslinking agent, the catalyst is an amine catalyst, and the organosilicon elastomer is a crosslinkable organosilicon polymer that can undergo a condensation reaction under the action of the catalyst to form an elastic silicone rubber film.

[0026] The preparation method of the first functional treatment liquid includes the following steps: S11 premixes nano-silica with some nonionic surfactant and a small amount of deionized water, and pre-disperses it for 15 minutes at 3000 rpm using a high shear disperser to form a uniform nano-silica pre-dispersed slurry. S12: Add approximately half the amount of deionized water to the main reactor and start stirring at a medium-low speed. Slowly add the aqueous polyurethane dispersion and stir for 15 minutes until homogeneous. While stirring, slowly add the nano-silica pre-dispersed slurry to the main reactor, increase the speed to 1500 rpm, and continue dispersing for 35 minutes until the system is homogeneous and glossy. Then, adjust the speed back to 800 rpm, slowly add the protective component, and continue stirring for 20 minutes to ensure complete and uniform mixing. S13 Reduce the stirring speed to 500 rpm, and slowly add the crosslinking agent in a thin stream or dropwise while stirring well. Continue stirring for 30 minutes. Then, pre-dilute the thickener with deionized water and slowly add it to the system while stirring at low speed. Finally, adjust the stirring speed to 300 rpm and mature for 30 minutes to obtain the first functional treatment solution.

[0027] The preparation method of the second functional treatment liquid includes the following steps: S21 mixes silicone elastomer, some nonionic surfactant and a small amount of deionized water, and pre-emulsifies it for 10 minutes at 3000 rpm using a high-shear emulsifier to form a homogeneous silicone elastomer pre-emulsion with good flowability. S22 mixes the fluorine-free three-proof finishing agent and amino silicone oil emulsion evenly in another container to obtain a premixed solution; S23. Add about two-thirds of the formula amount of deionized water to the main reactor and stir at 500 rpm. Slowly add the silicone-modified acrylic emulsion and stir for 15 minutes. While stirring continuously, slowly add the silicone elastomer pre-emulsion to the main reactor. After the addition is complete, increase the speed to 1000 rpm and continue to disperse for 15-20 minutes to fully mix and stabilize. S24. Adjust the stirring speed back to 800 rpm, slowly and evenly add the premixed liquid from step 2 into the system, and continue stirring for 25 minutes after the addition is complete to ensure complete mixing. S25 reduced the stirring speed to 400 rpm, fully diluted the catalyst with deionized water, and slowly added it to the system by dripping or a thin stream. After the addition was complete, continued stirring for 20 minutes to ensure complete integration. Finally, the stirring speed was adjusted to 250 rpm and the mixture was allowed to mature for 30 minutes to obtain the second functional treatment solution.

[0028] Example 3 A method for processing knitted bags includes the following steps: S1 selects a first knitted material and a second knitted material for woven bags, immerses the first knitted material in a first functional treatment liquid, and immerses the second knitted material in a second functional treatment liquid; S2 dries the first and second knitted materials after impregnation; S3 uses the dried first knitted material for weaving the bottom area of ​​the knitted bag, and the dried second knitted material for weaving the side area of ​​the knitted bag. A flat knitting machine is then used to integrally form the knitted bag body with zoned functional characteristics. The first functional treatment liquid comprises the following raw materials by mass percentage: 30% aqueous polyurethane dispersion, 5.5% nano-silica, 1.25% crosslinking agent, 7.5% protective component, 0.3% nonionic surfactant, 0.6% thickener, and 54.85% deionized water. The second functional treatment liquid comprises the following raw materials by mass percentage: 20% silicone-modified acrylic emulsion, 15% fluorine-free three-proof finishing agent, 3.5% silicone elastomer, 2% amino silicone oil emulsion, 0.3% nonionic surfactant, 0.45% catalyst, and 58.75% deionized water.

[0029] The protective component is an environmentally friendly fluorine-free waterproofing agent. The first and second knitting materials are yarns and flat or tubular webbing formed by preliminary knitting. In step S3, dynamic pattern units are provided on the side area of ​​the knitted bag. The dynamic pattern units are woven from environmentally responsive yarns, which are thermochromic yarns. The crosslinking agent is a aziridine crosslinking agent, the catalyst is an organotin catalyst, and the organosilicon elastomer is a crosslinkable organosilicon polymer. Under the action of the catalyst, a condensation reaction can occur to form an elastic silicone rubber film.

[0030] The preparation method of the first functional treatment liquid includes the following steps: S11 premixes nano-silica with some nonionic surfactant and a small amount of deionized water, and pre-disperses it for 12 minutes at 2500 rpm using a high-shear disperser to form a uniform nano-silica pre-dispersed slurry. S12: Add approximately half the amount of deionized water to the main reactor and start stirring at a medium-low speed. Slowly add the aqueous polyurethane dispersion and stir for 12 minutes until homogeneous. While stirring, slowly add the nano-silica pre-dispersed slurry to the main reactor, increase the speed to 1300 rpm, and continue dispersing for 30 minutes until the system is homogeneous and glossy. Then, adjust the speed back to 700 rpm, slowly add the protective component, and continue stirring for 18 minutes to ensure complete and uniform mixing. S13 Reduce the stirring speed to 400 rpm, and slowly add the crosslinking agent in a thin stream or dropwise while stirring well. Continue stirring for 25 minutes. Then, pre-dilute the thickener with deionized water and slowly add it to the system while stirring at low speed. Finally, adjust the stirring speed to 250 rpm and mature for 30 minutes to obtain the first functional treatment solution.

[0031] The preparation method of the second functional treatment liquid includes the following steps: S21 mixes silicone elastomer, some nonionic surfactant and a small amount of deionized water, and pre-emulsifies it for 8 minutes at 25,000 rpm using a high-shear emulsifier to form a homogeneous silicone elastomer pre-emulsion with good flowability. S22 mixes the fluorine-free three-proof finishing agent and amino silicone oil emulsion evenly in another container to obtain a premixed solution; S23. Add about two-thirds of the formula amount of deionized water to the main reactor and stir at 400 rpm. Slowly add the silicone-modified acrylic emulsion and stir for 12 minutes. While stirring continuously, slowly add the silicone elastomer pre-emulsion to the main reactor. After the addition is complete, increase the speed to 900 rpm and continue to disperse for 18 minutes to fully mix and stabilize. S24. Adjust the stirring speed back to 700 rpm, slowly and evenly add the premixed liquid from step 2 into the system, and continue stirring for 22 minutes after the addition is complete to ensure complete mixing. S25 reduced the stirring speed to 350 rpm, thoroughly diluted the catalyst with deionized water, and slowly added it to the system dropwise or in a thin stream. After the addition was complete, continued stirring for 15 minutes to ensure complete mixing. Finally, the stirring speed was increased to 250 rpm, and the mixture was allowed to mature for 30 minutes to obtain the second functional treatment solution. Example 4 Similar to Example 3, except that the first functional treatment liquid includes the following raw materials by mass percentage: 33% aqueous polyurethane dispersion, 6% nano silica, 1.5% crosslinking agent, 9% protective component, 0.4% nonionic surfactant, 0.8% thickener, and 49.3% deionized water; the second functional treatment liquid includes the following raw materials by mass percentage: 18% silicone-modified acrylic emulsion, 12% fluorine-free three-proof finishing agent, 3% silicone elastomer, 2.5% amino silicone oil emulsion, 0.2% nonionic surfactant, 0.3% catalyst, and 64% deionized water.

[0032] Example 5 Similar to Example 3, the difference lies in that the first functional treatment liquid comprises the following raw materials by mass percentage: 28% aqueous polyurethane dispersion, 4% nano silica, 1% crosslinking agent, 6% protective component, 0.2% nonionic surfactant, 0.4% thickener, and 60.4% deionized water; the second functional treatment liquid comprises the following raw materials by mass percentage: 22% silicone-modified acrylic emulsion, 18% fluorine-free three-proof finishing agent, 4% silicone elastomer, 1.5% amino silicone oil emulsion, 0.4% nonionic surfactant, 0.6% catalyst, and 53.5% deionized water.

[0033] Comparative Example 1 The first and second knitting materials are not processed in any way, and the knitted bag body is formed in one piece by a horizontal knitting machine.

[0034] Comparative Example 2 Both the first and second knitting materials are impregnated in the same ordinary acrylic coating adhesive, and the knitted bag body is formed in one piece by a flat knitting machine.

[0035] Comparative Example 3 Similar to Example 3, except that the first functional treatment liquid does not contain nano-silica and crosslinking agent.

[0036] Comparative Example 4 Similar to Example 3, except that the second functional treatment liquid does not contain a fluorine-free three-proof finishing agent.

[0037] The knitted bag bodies processed by Examples 1-5 and Comparative Examples 1-4 were subjected to the following tests: the test methods refer to industry standards.

[0038] 1. Abrasion resistance (bottom of the knitted bag body): Refer to GB / T 21196.2-2007, Textiles, Martindale process for determination of abrasion resistance of fabrics, and record the number of rubbing cycles when pilling, fuzzing, exposing the base material, or tearing occurs. The higher the number of cycles, the better the abrasion resistance.

[0039] 2. Tear resistance test (bottom of the knitted bag body), refer to GB / T 3917.2-2009, textiles, tear properties of fabrics - part 2: determination of tear strength by trapezoidal method. The higher the value, the stronger the tear resistance.

[0040] 3. Surface water repellency test (side of the knitted bag body): Refer to AATCC 22-2014 Water resistance: Spray test, water repellency rating (1-100 points). 100 points means the surface is completely dry, 90 points or above is excellent, and 0 points means completely wet.

[0041] 4. Oil resistance test (side of the knitted bag): Refer to AATCC 118-2017 Oil Resistance: Hydrocarbon Resistance Test, Oil Resistance Rating (1-8). The higher the rating, the better the oil resistance. ≥5 indicates good everyday oil resistance.

[0042] 5. Stain Removability Test (side of the knitted bag): Add common contaminants (such as soy sauce, coffee), let stand for 5 minutes, then wipe with a damp cloth. Stain residue rating (1-5). Level 5 indicates no residue and easy cleaning; Level 1 indicates severe stain residue and difficult cleaning. The following data are shown in Table 1.

[0043] Table 1

[0044] Comparative Example 1 performed the worst in all tests, demonstrating that the untreated knitted bag had extremely poor abrasion and tear resistance, was completely hydrophilic, and was extremely prone to staining—precisely the technical problem this invention aims to solve. Comparative Example 2 showed improved performance, but it was far inferior to any of the embodiments. This proves that a simple single coating cannot simultaneously achieve high strength on the bottom and high protection on the sides; zoned functionalization is a necessary and superior design. Comparative Example 3, while having side performance comparable to Example 3, showed a significant decrease in bottom abrasion resistance and tear resistance compared to Example 3. This directly proves that the nano-silica and crosslinking agent in the first functional treatment liquid played a decisive role in improving the abrasion and tear resistance of the bag bottom. Comparative Example 4, while having bottom performance comparable to Example 3, completely lost its water repellency, oil repellency, and stain-resistance on the sides, making it indistinguishable from the untreated sample. This strongly demonstrates that the fluorine-free three-proof finishing agent in the second functional treatment liquid is key to imparting hydrophobic, oil repellent, and stain-resistance properties to the sides of the knitted bag.

[0045] The functionalized processing method and its dedicated first and second functional treatment liquids provided by this invention, as demonstrated by experimental data, can effectively and specifically address the technical deficiencies of existing knitted bags. The first functional treatment liquid significantly improves the abrasion resistance and tear resistance of the bag bottom; the second functional treatment liquid significantly imparts hydrophobic, oil-repellent, and easy-to-clean properties to the bag sides. The above are merely preferred embodiments of this invention and are not intended to limit the invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A method for processing knitted bags, characterized in that, Includes the following steps: S1 selects a first knitted material and a second knitted material for woven bags, immerses the first knitted material in a first functional treatment liquid, and immerses the second knitted material in a second functional treatment liquid; S2. Dry the first and second knitted materials after impregnation; S3 uses the dried first knitted material for weaving the bottom area of ​​the knitted bag, and the dried second knitted material for weaving the side area of ​​the knitted bag. A flat knitting machine is then used to integrally form the knitted bag body with zoned functional characteristics. The first functional treatment liquid comprises the following raw materials by mass percentage: 25-35% aqueous polyurethane dispersion, 3-8% nano-silica, 0.5-2% crosslinking agent, 5-10% protective component, 0.1-0.5% nonionic surfactant, 0.2-1% thickener, and the balance deionized water. The second functional treatment liquid comprises the following raw materials by mass percentage: 15-25% silicone-modified acrylic emulsion, 10-20% fluorine-free three-proof finishing agent, 2-5% silicone elastomer, 1-3% amino silicone oil emulsion, 0.1-0.5% nonionic surfactant, 0.1-0.8% catalyst, and the balance deionized water.

2. The knitted bag processing method according to claim 1, characterized in that, The protective components include one or a mixture of several of the following: fluoropolymers, silicone water repellents, wax emulsions, and environmentally friendly fluorine-free waterproofing agents.

3. The knitted bag processing method according to claim 1, characterized in that, The first knitting material and the second knitting material are yarns, or flat or tubular webbing formed by preliminary knitting.

4. The knitted bag processing method according to claim 1, characterized in that, In step S3, a dynamic pattern unit is provided on the side area of ​​the knitted bag; the dynamic pattern unit is woven from environmentally responsive yarn, which is either thermochromic or photochromic.

5. The method for processing knitted bags according to claim 1, characterized in that, The crosslinking agent is a aziridine-based or carbodiimide-based crosslinking agent.

6. The method for processing knitted bags according to claim 1, characterized in that, The catalyst is an organotin or amine catalyst.

7. The method for processing knitted bags according to claim 1, characterized in that, The organosilicon elastomer is a crosslinkable organosilicon polymer that can undergo a condensation reaction under the action of the catalyst to form an elastic silicone rubber film.

8. The method for processing knitted bags according to claim 1, characterized in that, The preparation method of the first functional treatment liquid includes the following steps: S11 involves premixing nano-silica with a portion of nonionic surfactant and a small amount of deionized water, and then pre-dispersing it for 10-15 minutes using a high-shear disperser at a speed of 2000-3000 rpm to form a uniform nano-silica pre-dispersion slurry. S12: Add approximately half the amount of deionized water to the main reactor and start stirring at a medium-low speed. Slowly add the aqueous polyurethane dispersion and stir for 10-15 minutes until homogeneous. While stirring, slowly add the nano-silica pre-dispersed slurry to the main reactor, increase the speed to 1200-1500 rpm, and continue dispersing for 25-35 minutes until the system is homogeneous and glossy. Then, adjust the speed back to 600-800 rpm, slowly add the protective component, and continue stirring for 15-20 minutes to ensure complete and uniform mixing. S13 Reduce the stirring speed to 300-500 rpm, and slowly add the crosslinking agent in a thin stream or dropwise while stirring well. Continue stirring for 20-30 minutes. Then, pre-dilute the thickener with deionized water and slowly add it to the system while stirring at low speed. Finally, adjust the stirring speed to 200-300 rpm and mature for 30 minutes to obtain the first functional treatment solution.

9. The method for processing knitted bags according to claim 1, characterized in that, The preparation method of the second functional treatment liquid includes the following steps: S21 mixes silicone elastomer, some nonionic surfactant and a small amount of deionized water, and pre-emulsifies it for 5-10 minutes at 2000-3000 rpm using a high-shear emulsifier to form a homogeneous silicone elastomer pre-emulsion with good flowability. S22 mixes the fluorine-free three-proof finishing agent and amino silicone oil emulsion evenly in another container to obtain a premixed solution; S23. Add about two-thirds of the formula volume of deionized water to the main reactor and stir at 300-500 rpm. Slowly add the silicone-modified acrylic emulsion and stir for 10-15 minutes. While stirring continuously, slowly drop the silicone elastomer pre-emulsion into the main reactor. After the drop is completed, increase the speed to 800-1000 rpm and continue to disperse for 15-20 minutes to fully mix and stabilize. S24 Adjust the stirring speed back to 600-800 rpm, slowly and evenly add the premixed liquid from step 2 into the system, and continue stirring for 20-25 minutes after the addition is complete to ensure complete mixing; S25 reduces the stirring speed to 300-400 rpm, fully dilutes the catalyst with deionized water, and slowly adds it to the system dropwise or in a thin stream. After the addition is complete, continue stirring for 15-20 minutes to ensure complete integration. Finally, adjust the stirring speed to 150-250 rpm and mature for 30 minutes to obtain the second functional treatment solution.

10. A knitted bag, characterized in that, It is manufactured by the knitted bag processing method according to any one of claims 1-9.

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