Method for printing polyester / cotton interwoven fabric with anti-bacterial and deodorant properties and printed fabric thereof

Abstract

The present application belongs to the field of textile dyeing and finishing technology, and particularly relates to a polyester / cotton interwoven fabric uniform inkjet printing method with antibacterial and deodorization functions and printed fabric. The present application prepares a composite pretreatment solution containing silane coupling agent, nano metal oxide and polyethylene glycol diglycidyl ether, and completes the processing through pretreatment, drying, inkjet printing and steaming. The pretreatment solution can adjust the hydrophilic and hydrophobic difference of polyester and cotton fiber surface, realize uniform ink drop spreading, clear printing outline and no color difference penetration; at the same time, it constructs a covalent crosslinking network to anchor nano metal oxide, and realizes the integration of printing modification and antibacterial and deodorization functions in one step. The obtained fabric has an antibacterial rate of more than 99.9% on escherichia coli and staphylococcus aureus, and excellent deodorization effect on various odors after 50 times of washing. The present application does not need to modify the existing equipment, and has simple process, energy saving and environmental protection, safe and comfortable fabric, and is suitable for clothing, home textile and other fields, and has wide application prospect.

Description

Technical Field

[0001] This invention belongs to the field of textile dyeing and finishing technology, and particularly relates to a method for uniform inkjet printing of polyester / cotton blended fabrics with antibacterial and deodorizing properties, and the printed fabric thereof. Background Technology

[0002] Polyester / cotton blends combine the high strength, abrasion resistance, wrinkle resistance, and dimensional stability of polyester with the moisture absorption, breathability, and skin-friendly comfort of cotton fibers, making them a core substrate for high-end apparel, home textiles, and functional fabrics. With the greening and customization of digital inkjet printing technology, inkjet printing, with its advantages of short processing times, fine patterns, water conservation, and environmental friendliness, is increasingly widely used in the processing of polyester / cotton blends.

[0003] However, due to significant differences in chemical structure, surface energy, and hydrophilicity / hydrophobicity between polyester and cotton fibers—cotton fibers are hydrophilic and readily absorb and penetrate water-based reactive dyes and inks; while polyester is inert and hydrophobic, resulting in poor wetting and spreading properties of water-based inks—and because polyester / cotton blends are formed by the interweaving of polyester and cotton yarns (unlike polyester-cotton blends where fibers are uniformly blended), the spreading rate and penetration of ink droplets at the interweaving interface are difficult to coordinate. This easily leads to defects such as edge bleeding of printed patterns, blurred outlines, warp and weft color differences, and uneven coloring, making it difficult to achieve a clean and high-definition printing effect.

[0004] On the other hand, existing antibacterial and deodorizing finishing processes mostly use systems such as silver ions, quaternary ammonium salts, photocatalysts, and cyclodextrins. They generally employ independent padding or post-finishing processes, which are not only lengthy and consume a lot of water and energy, but also have poor compatibility with inkjet printing inks, easily interfering with ink droplet spreading and inhibiting dye fixation, resulting in a decrease in print clarity and color fastness. Conventional processes in the industry have consistently failed to simultaneously impart efficient and wash-resistant antibacterial and deodorizing functions to fabrics while ensuring print quality, resulting in poor process compatibility and high production costs.

[0005] While existing technologies have been used to study dyeing, printing, and functional modification of polyester / cotton blended fabrics, they all have technical shortcomings and have failed to fundamentally solve the technical problem of integrating printing uniformity control with antibacterial and deodorizing functions.

[0006] Chinese patent CN120465297A discloses a method for preparing multi-color, double-dyed antibacterial polyester / cotton blended fabrics. After dyeing with high-temperature, high-pressure disperse dyes, antibacterial modification is achieved by grafting sodium copper chlorophyllin onto cyanuric chloride. This process requires multi-stage, step-by-step heating treatments, resulting in cumbersome procedures and high cumulative energy consumption. Chlorine-containing auxiliaries can easily cause skin irritation, and sodium copper chlorophyllin exhibits poor photostability, leading to insufficient antibacterial and wash-resistant durability. Furthermore, this method lacks a dedicated pretreatment system, making it impossible to control the uniform spread of ink droplets or achieve simultaneous and coordinated pretreatment, printing, and functionalization.

[0007] Chinese patent CN118773930A employs a disperse / reactive dye co-printing process, involving pretreatment with caustic soda followed by mixed printing, and then multiple steps of color fixing including pre-drying, baking, and steaming. This approach relies on strong alkali pretreatment, which can easily damage the fabric's strength, and uneven caustic soda distribution can lead to fluctuations in color fixation rate. Furthermore, due to differences in the surface characteristics of polyester and cotton fibers, issues such as ink bleeding and uneven coloring persist. This process only optimizes the printing and color fixing process; it does not construct a composite pretreatment liquid system or integrate antibacterial and deodorizing functions. Additional functions require separate post-treatment, making integrated molding impossible.

[0008] Chinese patent CN112626662A discloses an antibacterial and deodorizing modified polyester yarn, which achieves fiber functionalization by blending catechin with opal powder during spinning. This method requires embedding functional components before spinning, resulting in poor compatibility; the functional components are mostly embedded inside the fiber, leading to low effective concentrations on the fabric surface, slow antibacterial and deodorizing effects, and insufficient long-lasting effects; furthermore, it only achieves functional modification of the yarn itself, without synergistic matching with inkjet printing pretreatment processes, failing to simultaneously ensure printing uniformity and multifunctional finishing.

[0009] Chinese patent CN214056712U discloses an antistatic polyester-cotton water-jet fabric, which adopts a multi-layer composite structure and relies on the physical adsorption of bamboo charcoal fibers to achieve antibacterial and deodorizing effects. This structure achieves its function solely through the physical composite layering of fibers, with the functional components deeply embedded within the fibers. This results in a small effective contact area with bacteria and odors, leading to low antibacterial and deodorizing efficiency. Furthermore, it lacks a dedicated pretreatment control system designed to address the surface energy differences between polyester and cotton fibers. During inkjet printing, the ink droplets from the two types of fibers exhibit inconsistent spreading behavior, resulting in uniformity defects such as color difference, edge bleeding, and pattern distortion.

[0010] Chinese patent CN211390449U discloses a three-layer composite fabric of polyester-cotton corduroy, which uses micropores in the fabric to internally release antibacterial agents in a targeted, slow-release manner. Mechanical perforation of micropores damages the fabric's structure, appearance, and feel, and is prone to clogging and failure with long-term use; the post-injection process of the antibacterial agent is not suitable for continuous inkjet printing production lines, resulting in low production efficiency; similarly, there is a lack of composite pretreatment liquid formulations and synergistic processes suitable for inkjet printing, making it impossible to simultaneously address the dual requirements of printing uniformity and long-lasting antibacterial and deodorizing effects.

[0011] In summary, existing technologies generally suffer from the following shortcomings: First, there is a lack of a dedicated composite pretreatment liquid formulation system suitable for inkjet printing on polyester / cotton blended fabrics. This makes it impossible to control the uniform spread of ink droplets at the levels of interface wetting, cross-linking fixation, and nano-dispersion, thus making it difficult to solve problems such as printing penetration, color difference, and uneven coloring. Second, the printing process and the antibacterial and deodorizing functional finishing are isolated from each other. There is no integrated synergistic process of pretreatment-inkjet printing-color fixing, resulting in separate processes, high energy consumption, poor compatibility of auxiliaries, and poor printing quality. Third, traditional functional modification relies mainly on spinning blending, physical lamination, or mechanical slow release, which cannot be deeply adapted to digital inkjet printing processes. It is difficult to obtain finished fabrics with clear printing outlines, uniform coloring, and high antibacterial and deodorizing rates even after multiple washes.

[0012] Therefore, how to efficiently and economically impart durable antibacterial and deodorizing functions to polyester / cotton blended fabrics while ensuring the quality of inkjet printing, and how to develop a processing method that uses a special composite pretreatment liquid to achieve uniform inkjet printing on polyester / cotton blended fabrics and simultaneously impart durable antibacterial and deodorizing properties to the fabrics through an integrated process, is not only a technical problem that urgently needs to be solved in this field, but also has important industrial application value and market promotion prospects. Summary of the Invention

[0013] To address the shortcomings of existing technologies, the technical problem to be solved by this invention is to provide a method for uniform inkjet printing of polyester / cotton blended fabrics, which enables simultaneous and uniform coloring and integrated molding of polyester and cotton fibers, has a simple process, excellent printing quality, and maintains high antibacterial and deodorizing rates even after multiple washes, and also provides the printed fabric thereof.

[0014] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a method for uniform inkjet printing of polyester / cotton blended fabrics with antibacterial and deodorizing properties, comprising the following steps:

[0015] (1) Preparation of composite pretreatment solution: The composite pretreatment solution includes silane coupling agent, nano metal oxide, polyethylene glycol diglycidyl ether, pH adjuster and deionized water;

[0016] (2) Application and drying of pretreatment solution: The composite pretreatment solution obtained in step (1) is applied to the surface of polyester / cotton blended fabric and then dried.

[0017] (3) Inkjet printing: inkjet printing is performed on the dried fabric;

[0018] (4) Color fixing treatment: The printed fabric is subjected to color fixing treatment.

[0019] The above-mentioned method for uniform inkjet printing of polyester / cotton blended fabrics with antibacterial and deodorizing properties comprises the following components by mass percentage: 1.0%–5.0% silane coupling agent, 0.2%–3.0% nano-metal oxide, 0.5%–2.0% polyethylene glycol diglycidyl ether, with the balance being deionized water and pH adjuster.

[0020] The above-mentioned method for uniform inkjet printing of polyester / cotton blended fabrics with antibacterial and deodorizing properties uses a silane coupling agent that is one or a combination of at least two of the following: γ-methacryloyloxypropyltrimethoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, γ-mercaptopropyltrimethoxysilane, γ-mercaptopropyltriethoxysilane, γ-aminopropyltriethoxysilane, γ-glycidoxypropyltrimethoxysilane, and γ-glycidoxypropyltriethoxysilane.

[0021] The above-mentioned method for uniform inkjet printing of polyester / cotton blended fabrics with antibacterial and deodorizing properties, wherein the nano-metal oxide is one or a combination of at least two of nano-titanium dioxide, nano-zinc oxide, nano-silica, nano-zirconia, and nano-alumina; the nano-metal oxide exists in the composite pretreatment solution in a sol or gel state.

[0022] The above-mentioned method for uniform inkjet printing of polyester / cotton blended fabrics with antibacterial and deodorizing properties, wherein the composite pretreatment solution has a pH value of 4.0 to 10.0, a viscosity of 5 to 50 mPa·s at 25°C, a surface tension of 25 to 35 mN / m, and a nanoparticle size of 20 to 400 nm.

[0023] In the above-mentioned method for uniform inkjet printing of polyester / cotton blended fabrics with antibacterial and deodorizing properties, in step (2), the composite pretreatment liquid is applied to the surface of the polyester / cotton blended fabric by spraying, the liquid coverage rate is controlled at 5% to 20%, and the drying temperature is 80℃ to 100℃.

[0024] In the above-mentioned method for uniform inkjet printing of polyester / cotton blended fabrics with antibacterial and deodorizing properties, step (3) involves using reactive dye ink for inkjet printing.

[0025] In the above-mentioned method for uniform inkjet printing of polyester / cotton blended fabrics with antibacterial and deodorizing properties, in step (4), the color fixing treatment adopts steam color fixing, and the steam conditions are: temperature 100℃~110℃, heat treatment in saturated steam atmosphere for 5~15min.

[0026] A polyester / cotton blend printed fabric prepared by a uniform inkjet printing method for polyester / cotton blends with antibacterial and deodorizing properties is disclosed. In this fabric, polyester and cotton fibers can be colored simultaneously and uniformly, resulting in clear printed patterns with no bleeding or color difference. After 50 standard washes, the fabric exhibits an antibacterial rate of over 99.9% against Staphylococcus aureus and Escherichia coli, and deodorization rates of ≥80% for ammonia, ≥80% for acetic acid, ≥90% for isovaleric acid, and ≥85% for 2-nonenal.

[0027] The advantages of the present invention regarding the uniform inkjet printing method for polyester / cotton blended fabrics that also possess antibacterial and deodorizing properties, and the advantages of the printed fabrics thereof, are as follows:

[0028] First, this invention utilizes the synergistic combination of silane coupling agents and polyethylene glycol diglycidyl ether to effectively improve the differences in hydrophilic and hydrophobic properties between polyester and cotton fibers. This makes the ink droplet spreading behavior on the surfaces of the two fibers more consistent, achieving synchronous and uniform coloring of polyester and cotton components. The printed patterns have clear edges and no bleeding defects, and the printing fineness and various color fastness properties can meet industrial production standards. At the same time, this invention directly integrates the antibacterial and deodorizing functional components of nano-metal oxides into the printing composite pretreatment liquid. The fabric printing modification and antibacterial and deodorizing functional finishing can be completed simultaneously in one pretreatment step, eliminating the additional functional post-treatment process in traditional processes. This simplifies the production process, reduces equipment investment, and effectively saves water and energy consumption. It also avoids the problems of poor compatibility between conventional functional finishing agents and printing inks, which can easily degrade printing quality.

[0029] Secondly, this invention employs a nano-metal oxide compound system to endow fabrics with broad-spectrum and highly efficient antibacterial and deodorizing properties. After 50 standard water washes, the antibacterial rate against Staphylococcus aureus and Escherichia coli can still reach over 99.9%, and it maintains excellent deodorizing effects against odors such as ammonia, acetic acid, isovaleric acid, and 2-nonenal. Furthermore, each functional component forms a covalent cross-linked network with polyethylene glycol diglycidyl ether through a silane coupling agent, firmly anchoring it to the fiber surface. This ensures long-lasting functionality and water resistance, overcoming the shortcomings of traditional functional finishing materials that are prone to detachment and have poor durability.

[0030] The process of this invention is compatible with existing conventional digital printing equipment, requiring no large-scale equipment modification. It offers strong process controllability and is suitable for polyester / cotton blended fabrics of any ratio. It can also be extended to inkjet printing and functional finishing of other heterogeneous fiber blends and interweavings. The auxiliary raw materials used leave no irritating residues, and the functional components are stably fixed without damaging the original moisture absorption and breathability properties of the fabric. It is safe to use, comfortable to wear, and has broad prospects for industrial application, making it worthy of widespread promotion and application. Attached Figure Description

[0031] Figure 1 This is a flowchart illustrating the preparation process of KH550-modified ZnO-based functional powder for composite pretreatment liquids according to the present invention.

[0032] Figure 2 (a), (b), and (c) are, in order, actual images of the composite pretreatment solutions prepared in Examples 1, 2, and 3 of this invention;

[0033] Figure 3 This is a particle size distribution curve of the composite pretreatment solution of the present invention;

[0034] Figure 4 (a) is a scanning electron microscope image of the surface morphology of the untreated polyester / cotton blended fabric, and (b) is a scanning electron microscope image of the surface morphology of the polyester / cotton blended fabric after treatment with the composite pretreatment solution of the present invention.

[0035] Figure 5 (a) shows the surface microstructure of the modified polyester fiber loaded with nano-ZnO after washing, and (b) shows the surface microstructure of the modified cotton fiber loaded with nano-ZnO after washing.

[0036] Figure 6 (a) is a comparison of the original fabric before and after inkjet printing and steaming and soaping, and (b) is a comparison of the polyester / cotton blended fabric before and after inkjet printing and steaming and soaping, after treatment with the composite pretreatment liquid of the present invention.

[0037] Figure 7 The image shows the plate colony test results of the antibacterial properties of polyester / cotton blended fabrics treated with the present invention against Staphylococcus aureus. Detailed Implementation

[0038] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0039] In this invention, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in its actual use or operating state, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device. Furthermore, in the description of this application, the term "comprising" means "including but not limited to". The terms first, second, third, etc., are used merely as illustrative purposes and do not impose numerical requirements or establish an order. The term "multiple" means "two or more".

[0040] like Figure 1 As shown, a method for uniform inkjet printing on polyester / cotton blended fabrics that also has antibacterial and deodorizing properties includes the following steps:

[0041] (1) Preparation of composite pretreatment solution: The composite pretreatment solution includes silane coupling agent, nano metal oxide, crosslinking agent polyethylene glycol diglycidyl ether, pH adjuster and deionized water; by mass percentage, silane coupling agent 1.0% to 5.0%, nano metal oxide 0.2% to 3.0%, polyethylene glycol diglycidyl ether 0.5% to 2.0%, and the balance is deionized water and pH adjuster.

[0042] The silane coupling agent is one or at least a combination of two of the following: γ-methacryloxypropyltrimethoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, γ-mercaptopropyltrimethoxysilane, γ-mercaptopropyltriethoxysilane, γ-aminopropyltriethoxysilane, γ-glycidoxypropyltrimethoxysilane, and γ-glycidoxypropyltriethoxysilane.

[0043] The nano-metal oxide is one or a combination of at least two of nano-titanium dioxide, nano-zinc oxide, nano-silica, nano-zirconia, and nano-alumina; the nano-metal oxide exists in the composite pretreatment solution in a sol or gel state.

[0044] The pH value of the prepared composite pretreatment solution was controlled at 4.0–10.0, the viscosity at 25℃ was 5–50 mPa·s, the surface tension was 25–35 mN / m, and the nanoparticle size distribution of the system was 20–400 nm.

[0045] (2) Application and drying of pretreatment liquid: The composite pretreatment liquid obtained in step (1) is applied to the surface of polyester / cotton blended fabric by spraying, padding, spraying or coating. Spraying is preferred. The liquid content of the fabric is controlled to be 5% to 20%. Then, the fabric is dried at 80°C to 100°C.

[0046] (3) Inkjet printing: Digital inkjet printing is performed on the dried polyester / cotton blended fabric using reactive dye ink.

[0047] (4) Color fixing treatment: The printed fabric is fixed by steaming. The steaming process conditions are: temperature 100℃~110℃, heat treatment in saturated steam atmosphere for 5~15min.

[0048] Depend on Figure 3 It is known that the particle size of the composite pretreatment liquid is mainly distributed in the range of 100-400nm, exhibiting a narrow single-peak distribution with no obvious large particle agglomeration, and excellent particle size uniformity. The uniform and moderate particle size allows the pretreatment components to form a continuous, ultra-thin, and uniform modified film on the surface of polyester and cotton fibers. It avoids the problem of fiber surface clumping and pore blockage caused by excessively large particle size, and also avoids the problem of insufficient control effect due to excessively small particle size. It can precisely control the dispersion and polar components of fiber surface energy, effectively inhibiting ink seepage along the fiber capillary and improving the clarity and color fastness of digital printing on polyester-cotton blended fabrics.

[0049] Depend on Figure 4 It is evident that the untreated raw fabric Figure 4 (a) The yarn surface has a lot of fuzz and the fibers are loose. The gaps between the yarn interlacing are too large and the fiber arrangement is disordered. The ink is easy to spread capillaryly along the gaps and fuzz of the yarn, causing the printing to bleed and blur. After pretreatment and modification Figure 4 (b) The overall fabric weave structure is intact, the yarn surface hairs are reduced, the fiber arrangement is more regular and compact, and the pore structure between yarns is optimized. The modification treatment does not destroy the original plain weave structure of the fabric, but only modifies the regularization of the surface fibers of the yarn, which can effectively restrict the random penetration of ink along the pores of the fabric, and significantly improve the clarity of digital printing while ensuring the breathability of the fabric.

[0050] in, Figure 5 In (a), under low magnification, the polyester fibers are arranged in a regular manner, with a smooth fiber surface and complete structure; under high magnification, it can be seen that the pretreatment component of the present invention can uniformly fix and coat nano ZnO on the surface of polyester fibers to form a thin and continuous composite modified film layer. There is no obvious agglomeration or clumping of ZnO. The modified layer is tightly bonded to the fiber matrix and remains stably attached after washing, without damaging the original smooth and dense structural features of the polyester fibers. Figure 5 In (b), cotton fibers naturally possess a twisted and curved structure, with a clear interlacing arrangement of fibers under low magnification. Under high magnification, it can be seen that the pretreatment component uniformly covers the surface of the cotton fibers with nano-ZnO, filling some of the fine grooves and pores on the fiber surface while preserving the natural structure of the cotton fibers themselves. The modified layer is thin and uniform, without completely sealing the fiber channels, balancing ink penetration and bonding, anti-capillary bleeding effects, and ZnO antibacterial stability. After pretreatment according to this invention, a uniform and continuous ZnO-containing modified thin layer is formed on the surface of both polyester and cotton fibers, which can directionally control the dispersion and polar components of the fiber surface energy, optimizing the fiber surface wetting performance: on the one hand, it improves the bonding strength between ink and fiber, and on the other hand, it inhibits the random capillary diffusion of ink along the fiber / yarn, solving the problems of edge bleeding and color bleeding in digital printing on polyester-cotton fabrics; at the same time, nano-ZnO is stably loaded on the fiber surface, giving the fabric excellent antibacterial properties, and the modification treatment does not damage the fiber structure, ensuring the original hand feel, strength, and other performance properties of the fabric.

[0051] As shown in Figure 6(a), during the printing process, the ink on the untreated fabric tends to spread capillarily along the yarn direction, resulting in obvious transverse serrated bleed and seepage at the edges of the printed color blocks. Ink droplets cannot achieve precise localization and spreading, leading to blurred print outlines and poor detail. After steaming and washing, the printed pattern becomes even more blurred, edge diffusion intensifies, and colorfastness is poor. This is because the surface wettability of the original fabric fibers is uneven, allowing ink to diffuse randomly along fiber gaps, and the ink-fiber bonding stability is poor. However, the fabric modified with the composite pretreatment solution of this invention (…) Figure 6(b) The edges of the printed color blocks are sharp and regular, with no obvious lateral bleeding or smudging defects, and the ink droplets can spread accurately within the printed area. After steaming and washing, the printed pattern remains clear and regular, with no obvious bleeding or fading. The reason for this is that the composite pretreatment liquid of the present invention can directionally regulate the dispersion and polarity components of the fabric surface energy, optimize the pore structure and wetting performance of the fiber surface, and limit the random capillary penetration of the ink while ensuring normal ink coloring. At the same time, the pretreatment components are firmly bonded to the fiber, improving the ink fixation stability, significantly improving the clarity, regularity, and wash fastness of digital printing on fabrics, and solving the technical problems of easy edge bleeding, color bleeding, and insufficient color fastness in traditional fabric printing.

[0052] Figure 7 (a) is the untreated blank control group. A large number of golden yellow / pale yellow colonies are evenly distributed in the plate and the number of colonies is large, indicating that the unmodified fabric has no inhibitory effect on bacteria and bacteria can proliferate normally. It serves as a benchmark control for antibacterial performance. Figure 7 (b)-(f) show the sample groups after loading nano-ZnO and undergoing pretreatment-crosslinking modification according to the present invention. The number of colonies in each plate decreased sharply, with only a few tiny colonies present, and some plates were almost colonies-free. As the modification conditions were optimized (the amount of crosslinking agent / pretreatment agent was increased), the number of colonies continued to decrease. Figure 7 (d)-(f) show almost no visible colonies. This indicates that the present invention stabilizes nano-ZnO on the fiber surface through pretreatment, and after cross-linking modification, the fabric has excellent antibacterial properties and can significantly inhibit the growth and reproduction of Staphylococcus aureus.

[0053] The polyester / cotton blended printed fabric prepared by the method of this invention allows for simultaneous and uniform coloring of polyester and cotton fibers, with a color difference ΔE of less than 1.0 between the two fibers. The printed pattern has a clear outline, no bleeding, and no color difference. After 50 standard washes, the fabric exhibits an antibacterial rate of over 99.9% against Staphylococcus aureus and Escherichia coli. It also achieves highly efficient deodorization through the photocatalytic effect of nano-ZnO, with deodorization rates of ≥80% for ammonia, ≥80% for acetic acid, ≥90% for isovaleric acid, and ≥85% for 2-nonenal.

[0054] The mechanism of action of this invention is explained from four aspects: printing uniformity, antibacterial properties, deodorization, and washability.

[0055] 1. Mechanism for Improving Printing Uniformity: After heat treatment, silane coupling agents and polyethylene glycol diglycidyl ether can form functional films on the surfaces of polyester and cotton fibers. Polyethylene glycol diglycidyl ether can construct a hydrophilic network structure on the polyester surface, effectively reducing the surface hydrophilicity difference between polyester and cotton fibers. Simultaneously, the silane coupling agent can bind to the hydroxyl groups on the cotton fiber surface, neutralizing the negative charge on the cotton fiber surface and inhibiting the lateral diffusion of reactive dye inks on the cotton fibers. The two synergistically regulate the spreading and wetting behavior of ink droplets on the surfaces of the two types of fibers, making the ink droplet spreading state more uniform, ultimately achieving a clear outline and overall uniform inkjet printing effect.

[0056] 2. Antibacterial Mechanism: Nanoscale metal oxides can, on the one hand, slowly release metal ions or generate reactive oxygen species through photocatalysis, disrupting the bacterial cell wall and cell membrane structure; on the other hand, nanoparticles can directly contact the bacterial surface to form physical damage. This dual mechanism works synergistically to give the fabric broad-spectrum and highly effective antibacterial properties.

[0057] 3. Deodorization Mechanism: Nano-metal oxides have a high specific surface area and abundant surface active sites, which can efficiently adsorb small odor molecules such as ammonia and acetic acid; at the same time, under light conditions, they can exert a photocatalytic effect to oxidize and decompose the adsorbed odor organic matter into carbon dioxide, water and harmless inorganic salts, thus achieving long-lasting deodorization.

[0058] 4. Wash fastness mechanism: Under heat treatment conditions, polyethylene glycol diglycidyl ether and silane coupling agent can undergo self-crosslinking reaction. At the same time, both can form stable covalent bonds with the hydroxyl groups of cotton fibers, constructing a dense crosslinked network on the fiber surface. This network can physically coat and chemically anchor the nano-metal oxides. In addition, the crosslinked film layer itself has excellent water resistance stability, which greatly improves the wash fastness of functional components and printing effect.

[0059] The present application will be specifically described below through specific embodiments. The following embodiments are only some embodiments of the present application and are not intended to limit the present application.

[0060] Example 1

[0061] A method for uniform inkjet printing on polyester / cotton blended fabrics that also has antibacterial and deodorizing properties includes the following steps:

[0062] (1) Preparation of composite pretreatment solution:

[0063] By weight percentage, 1.0 wt.% vinyltrimethoxysilane, 0.2 wt.% nano-titanium dioxide, and 1.0 wt.% polyethylene glycol diglycidyl ether were added to deionized water. The pH of the system was adjusted to 6.0 with acetic acid, and the mixture was stirred at 25°C for 30 min until completely dissolved to obtain the composite pretreatment solution. The above pretreatment solution had a viscosity of 15 mPa·s, a surface tension of 32 mN / m, and a nanoparticle size of 260 nm at 25°C. Figure 3 The particle size distribution characteristics of the composite pretreatment solution are shown below; the actual appearance can be found in [reference needed]. Figure 2 As shown in (a).

[0064] (2) Application and drying of pretreatment solution:

[0065] A polyester / cotton blended fabric with a polyester / cotton weight ratio of 61:39, consisting of polyester yarn in the warp and cotton yarn in the weft, was selected. The fabric was laid flat, and a prepared pretreatment solution was evenly sprayed onto the fabric surface using a digital inkjet printer, controlling the liquid content to 10%. It was then placed in an oven and dried at 90℃ for 5 minutes. The surface morphology of the fabric treated in this step differed significantly from that of the untreated fabric; details can be found in [reference needed]. Figure 4 A comparison of the surface morphology of (a) untreated polyester / cotton blended fabric and (b) fabric treated with the composite pretreatment solution of the present invention.

[0066] (3) Inkjet printing: The pre-treated and dried fabric is fixed on a digital inkjet printer and inkjet printing is performed using four colors of reactive dye ink: cyan, magenta, yellow and black. The printing resolution is set to 600×600dpi and the droplet size is 10pL.

[0067] (4) Color fixing treatment:

[0068] The printed fabric is first pre-dried at 80℃ for 3 minutes, then transferred to a steam oven and steamed at 102℃ for 10 minutes to fix the color; finally, it is washed, soaped, and dried to obtain the finished printed fabric.

[0069] Performance testing showed that the polyester / cotton blended printed fabric prepared in this embodiment achieved simultaneous and uniform coloring of polyester and cotton fibers, with a fiber color difference ΔE of 0.31. The printed pattern had neat and clear edges with no bleeding, demonstrating significant advantages compared to the printed effect on the untreated original fabric. Figure 6 (a) Comparison of printing on untreated raw fabric and (b) printing after treatment according to the present invention), the K / S value is increased by 35% compared with conventional pretreatment processes. After 50 standard washes, the fabric showed an antibacterial rate of 99.5% against Staphylococcus aureus and 99.2% against Escherichia coli (antibacterial effect can be referenced). Figure 7The antibacterial test results are shown below; ammonia deodorization rate: 87%; acetic acid deodorization rate: 89%; isovaleric acid deodorization rate: 97%; 2-nonenal deodorization rate: 93%; after washing, the nano-functional particles can still be uniformly distributed on the fiber surface. For details, please refer to [link to relevant documentation]. Figure 5 (a) Distribution of nanoparticles on the surface of polyester fibers after washing, and (b) Distribution of nanoparticles on the surface of cotton fibers.

[0070] Example 2

[0071] A method for uniform inkjet printing on polyester / cotton blended fabrics that also has antibacterial and deodorizing properties includes the following steps:

[0072] (1) Preparation of composite pretreatment solution:

[0073] By mass fraction, 2.0 wt.% of silane coupling agent (a mixture of vinyltriethoxysilane and γ-mercaptopropyltrimethoxysilane), 1.2 wt.% of nano-zinc oxide, and 1.0 wt.% of polyethylene glycol diglycidyl ether were added to deionized water. The pH of the system was adjusted to 4.0 with acetic acid, and the mixture was stirred at 25°C for 30 min until completely dissolved to obtain the composite pretreatment solution. This pretreatment solution had a viscosity of 35 mPa·s, a surface tension of 29 mN / m, and a nanoparticle size of 50–150 nm (corresponding to…). Figure 3 The particle size distribution range of the composite pretreatment solution shown is illustrated in the image. For the actual appearance of the sample, please refer to [reference needed]. Figure 2 As shown in (b).

[0074] (2) Application and drying of pretreatment solution:

[0075] A polyester / cotton blended fabric with a polyester / cotton mass ratio of 61 / 39, with polyester yarn in the warp and cotton yarn in the weft, was selected. The fabric was laid flat on a worktable, and the composite pretreatment liquid prepared in step (1) was uniformly sprayed onto the fabric surface using a digital inkjet printer, controlling the liquid coverage rate to 10%. The fabric was then placed in an oven and dried at 90°C for 5 minutes. A uniform functional film layer was formed on the surface of the fabric after this step. (Refer to...) Figure 4 The surface morphology features shown in (b) are shown in the figure.

[0076] (3) Inkjet printing:

[0077] The pre-treated and dried fabric is fixed on a digital inkjet printer, and inkjet printing is performed using four colors of reactive dye ink: cyan, magenta, yellow, and black. The printing resolution is set to 600×600dpi, and the droplet size is 10pL.

[0078] (4) Color fixing treatment:

[0079] The printed fabric is first pre-dried at 80℃ for 3 minutes, then placed in a steam oven and steamed at 102℃ saturated steam pressure for 10 minutes to fully fix the dye. After steaming, it is washed with water, soaped, and dried to obtain the finished printed fabric.

[0080] Performance tests show that the polyester / cotton blended printed fabric prepared in this embodiment achieves synchronous and uniform coloring of polyester and cotton fibers, with a fiber color difference ΔE of 0.53. The printed pattern has clear and regular edges with no bleeding, and the printing effect is significantly improved compared to the untreated original fabric. Figure 6 (Comparison of (a) and (b)) shows that the K / S value is 38% higher than that of conventional pretreatment processes. After 50 standard washes, the fabric exhibits a 99.7% inhibition rate against Staphylococcus aureus and a 99.5% inhibition rate against Escherichia coli (antibacterial effect can be referenced). Figure 7 The test results shown are as follows: ammonia deodorization rate 87%, acetic acid deodorization rate 89%, isovaleric acid deodorization rate 96%, and 2-nonenal deodorization rate 93%; after washing, the nano-ZnO particles can still be uniformly adhered to the surface of polyester and cotton fibers. For details, please refer to... Figure 5 The distribution states are shown in (a) and (b).

[0081] Example 3

[0082] A method for uniform inkjet printing on polyester / cotton blended fabrics that also has antibacterial and deodorizing properties includes the following steps:

[0083] (1) Preparation of composite pretreatment solution:

[0084] By weight percentage, 3.0 wt.% γ-mercaptopropyltriethoxysilane, 2.0 wt.% nano-zirconia, and 1.0 wt.% polyethylene glycol diglycidyl ether were added to deionized water. The pH of the system was adjusted to 7.0 with acetic acid, and the mixture was stirred at 25°C for 30 min until completely dissolved to obtain the composite pretreatment solution. This pretreatment solution had a viscosity of 5 mPa·s, a surface tension of 25 mN / m, and a nanoparticle size of 20 nm at 25°C. Figure 3 The particle size distribution characteristics of the composite pretreatment solution are shown below; the actual appearance can be found in [reference needed]. Figure 2 As shown in (c).

[0085] (2) Application and drying of pretreatment solution:

[0086] A polyester / cotton interwoven fabric with a polyester / cotton mass ratio of 61 / 39, with polyester yarn in the warp and cotton yarn in the weft, was selected. The fabric was laid flat on a workbench, and the composite pretreatment liquid prepared in step (1) was uniformly sprayed onto the fabric surface using a digital inkjet printer, with the liquid coverage rate controlled at 10%. The fabric was then placed in an oven and dried at 90°C for 5 minutes. The surface morphology of the treated fabric can be referenced. Figure 4As shown in (b), compared with untreated fabric ( Figure 4 (a) The surface is more uniform compared to the surface.

[0087] (3) Inkjet printing: The pre-treated and dried fabric is fixed on a digital inkjet printer and inkjet printing is performed using four colors of reactive dye ink: cyan, magenta, yellow and black. The printing resolution is set to 600×600dpi and the droplet size is 10pL.

[0088] (4) Color fixing treatment:

[0089] The printed fabric is first pre-dried at 80℃ for 3 minutes, then transferred to a steam oven and steamed at 102℃ saturated steam for 10 minutes to fully fix the dye; finally, it is washed, soaped, and dried to obtain the finished printed fabric.

[0090] Performance testing showed that the polyester / cotton blend printed fabric prepared in this embodiment achieved simultaneous and uniform coloring of polyester and cotton fibers, with a fiber color difference ΔE of 0.40. The printed pattern had neat and clear edges with no bleeding, and the K / S value was 36% higher than that of conventional pretreatment processes. After 50 standard washes, the fabric showed an antibacterial rate of 99.8% against Staphylococcus aureus and 99.5% against Escherichia coli (antibacterial effect can be referenced). Figure 7 (As shown); ammonia deodorization rate 86%, acetic acid deodorization rate 89%, isovaleric acid deodorization rate 97%, 2-nonenal deodorization rate 94%; after washing, the nanoparticles are evenly distributed on the fiber surface with no obvious shedding. For details, please refer to [link to relevant documentation]. Figure 5 As shown in (a) and (b).

[0091] Example 4

[0092] A method for uniform inkjet printing on polyester / cotton blended fabrics that also has antibacterial and deodorizing properties includes the following steps:

[0093] (1) Preparation of composite pretreatment solution:

[0094] By weight percentage, 4.0 wt.% γ-aminopropyltriethoxysilane, 2.5 wt.% nano-alumina, and 1.0 wt.% polyethylene glycol diglycidyl ether were added to deionized water. The pH of the system was adjusted to 9.0 using acetic acid, and the mixture was stirred at 25°C for 30 min until completely dissolved to obtain the composite pretreatment solution. This pretreatment solution had a viscosity of 42 mPa·s, a surface tension of 35 mN / m, and a nanoparticle size of 400 nm (corresponding to...). Figure 3 The particle size distribution characteristics of the composite pretreatment solution are shown.

[0095] (2) Application and drying of pretreatment solution:

[0096] A polyester / cotton blended fabric with a polyester / cotton mass ratio of 61 / 39, with polyester yarn in the warp and cotton yarn in the weft, was selected. The fabric was laid flat on a workbench, and the composite pretreatment liquid prepared in step (1) was uniformly sprayed onto the fabric surface using a digital inkjet printer, with the liquid coverage rate controlled at 10%. The fabric was then placed in an oven and dried at 90°C for 5 minutes. A stable functional layer was formed on the surface of the treated fabric, the morphology of which can be referenced. Figure 4 As shown in (b).

[0097] (3) Inkjet printing: The pre-treated and dried fabric is fixed on a digital inkjet printer and inkjet printing is performed using four colors of reactive dye ink: cyan, magenta, yellow and black. The printing resolution is set to 600×600dpi and the droplet size is 10pL.

[0098] (4) Color fixing treatment:

[0099] The printed fabric is first pre-dried at 80℃ for 3 minutes, then transferred to a steam oven and steamed at 102℃ saturated steam for 10 minutes to fully fix the dye; finally, it is washed, soaped, and dried to obtain the finished printed fabric.

[0100] Performance tests show that the polyester / cotton blended printed fabric prepared in this embodiment can achieve synchronous and uniform coloring of polyester and cotton fibers, with a fiber color difference ΔE of 0.62; the printed pattern has neat and clear edges, with no bleeding phenomenon (corresponding to...). Figure 6 The printing effect shown in (b) indicates that the K / S value is 39% higher than that of conventional pretreatment processes. After 50 standard washes, the fabric exhibits a 99.8% antibacterial rate against Staphylococcus aureus and a 99.5% antibacterial rate against Escherichia coli; the deodorization rates are 86% for ammonia, 88% for acetic acid, 97% for isovaleric acid, and 94% for 2-nonenal; after washing, the nanoparticles remain evenly distributed on the fiber surface, as shown in [reference needed]. Figure 5 As shown in (a) and (b).

[0101] Example 5

[0102] A method for uniform inkjet printing on polyester / cotton blended fabrics that also has antibacterial and deodorizing properties includes the following steps:

[0103] (1) Preparation of composite pretreatment solution:

[0104] By weight percentage, 5.0 wt.% of silane coupling agent (a mixture of γ-glycidyl etheroxypropyltrimethoxysilane and γ-glycidyl etheroxypropyltriethoxysilane), 3.0 wt.% of nano-silica, and 1.0 wt.% of polyethylene glycol diglycidyl ether were added to deionized water. The pH of the system was adjusted to 10.0 with acetic acid, and the mixture was stirred at 25°C for 30 min until completely dissolved to obtain the composite pretreatment solution. This pretreatment solution had a viscosity of 50 mPa·s, a surface tension of 30 mN / m, and a nanoparticle size of 160 nm (corresponding to...). Figure 3 The particle size distribution characteristics of the composite pretreatment solution are shown.

[0105] (2) Application and drying of pretreatment solution:

[0106] A polyester / cotton interwoven fabric with a polyester / cotton mass ratio of 61 / 39, with polyester yarn in the warp and cotton yarn in the weft, was selected. The fabric was laid flat on a workbench, and the composite pretreatment liquid prepared in step (1) was uniformly sprayed onto the fabric surface using a digital inkjet printer, with the liquid coverage rate controlled at 10%. The fabric was then placed in an oven and dried at 90°C for 5 minutes. The surface morphology of the treated fabric can be referenced. Figure 4 As shown in (b), compared with untreated fabric ( Figure 4 (a) Compared to the previous version, the surface smoothness and uniformity are significantly improved.

[0107] (3) Inkjet printing: The pre-treated and dried fabric is fixed on a digital inkjet printer and inkjet printing is performed using four colors of reactive dye ink: cyan, magenta, yellow and black. The printing resolution is set to 600×600dpi and the droplet size is 10pL.

[0108] (4) Color fixing treatment:

[0109] The printed fabric is first pre-dried at 80℃ for 3 minutes, then transferred to a steam oven and steamed at 102℃ saturated steam for 10 minutes to fully fix the dye; finally, it is washed, soaped, and dried to obtain the finished printed fabric.

[0110] Performance testing showed that the polyester / cotton blended printed fabric prepared in this embodiment achieved synchronous and uniform coloring of polyester and cotton fibers, with a fiber color difference ΔE of 0.30; the printed pattern had neat and clear edges, with no bleeding phenomenon (corresponding to...). Figure 6 The printing effect shown in (b) indicates that the K / S value is 37% higher than that of conventional pretreatment processes. After 50 standard washes, the fabric exhibits a 99.8% inhibition rate against Staphylococcus aureus and a 99.5% inhibition rate against Escherichia coli (antibacterial effect can be referenced). Figure 7(As shown); ammonia deodorization rate 86%, acetic acid deodorization rate 88%, isovaleric acid deodorization rate 96%, 2-nonenal deodorization rate 93%; after washing, the nanoparticles are uniformly attached to the fiber surface with no obvious shedding. See details in [link to relevant documentation]. Figure 5 As shown in (a) and (b).

[0111] Comparative Example 1:

[0112] (1) Preparation of pretreatment solution without nano metal oxides: 1.0 wt.% vinyltrimethoxysilane and 1.0 wt.% polyethylene glycol diglycidyl ether were added to deionized water by mass percentage. The pH of the system was adjusted to 6.0 by acetic acid and stirred at 25°C for 30 min until completely dissolved to obtain the pretreatment solution without nano metal oxides.

[0113] (2) Application and drying of pretreatment solution: Select a polyester / cotton interwoven fabric with a polyester / cotton mass ratio of 61 / 39, with polyester yarn in the warp and cotton yarn in the weft. Lay the fabric flat on the worktable and use a digital inkjet printer to uniformly spray the pretreatment solution prepared in step (1) onto the fabric surface, controlling the liquid coverage rate to 10%. Then place the fabric in an oven and dry it at 90°C for 5 minutes.

[0114] (3) Inkjet printing: The pre-treated and dried fabric is fixed on a digital inkjet printer and inkjet printing is performed using four colors of reactive dye ink: cyan, magenta, yellow and black. The printing resolution is set to 600×600dpi and the ink droplet size is 10pL.

[0115] (4) Drying and steam fixing: The printed fabric is first pre-dried at 80℃ for 3 minutes, and then placed in a steam box and steamed at 102℃ saturated steam pressure for 10 minutes to fully fix the dye; after steaming, it is washed with water, soaped and dried to obtain the finished printed fabric.

[0116] Effect Evaluation 1:

[0117] The polyester / cotton blended printed fabric obtained from Comparative Example 1 was compared with the fabrics prepared in Examples 1, 2, and 3 of this invention. The results are as follows: The fabric prepared in Comparative Example 1 has no antibacterial or deodorizing functions, and the inkjet printing color is too light. There is a significant color difference between the polyester and cotton fibers. The printing quality and function are far lower than those of the embodiments of this invention. Specific performance data are detailed in Table 1 below.

[0118] Table 1

[0119]

[0120] Comparative Example 2:

[0121] (1) Preparation of pretreatment solution without silane coupling agent

[0122] By mass percentage, 2.5 wt.% nano alumina and 1.0 wt.% polyethylene glycol diglycidyl ether were added to deionized water, the pH of the system was adjusted to 9.0 with acetic acid, and the mixture was stirred at 25°C for 30 min until completely dissolved to obtain a pretreatment solution without silane coupling agent.

[0123] (2) Application of pretreatment solution and drying

[0124] A polyester / cotton interwoven fabric with a polyester / cotton mass ratio of 61 / 39, with polyester yarn in the warp and cotton yarn in the weft, was selected. The fabric was laid flat on the worktable, and the pretreatment liquid prepared in step (1) was uniformly sprayed onto the fabric surface using a digital inkjet printer, with the liquid coverage rate controlled at 10%. The fabric was then placed in an oven and dried at 90°C for 5 minutes.

[0125] (3) Inkjet printing

[0126] The pre-treated and dried fabric is fixed on a digital inkjet printer, and inkjet printing is performed using four colors of reactive dye ink: cyan, magenta, yellow, and black. The printing resolution is set to 600×600dpi, and the droplet size is 10pL.

[0127] (4) Drying and steam color fixing

[0128] The printed fabric is first pre-dried at 80℃ for 3 minutes, then placed in a steam oven and steamed at 102℃ saturated steam pressure for 10 minutes to fully fix the dye. After steaming, it is washed with water, soaped, and dried to obtain the finished printed fabric.

[0129] Effect Evaluation 2

[0130] The polyester / cotton blended printed fabrics prepared in Comparative Example 2 and Example 4 were compared and tested. Comparative Example 2 did not add a silane coupling agent to its pretreatment solution, resulting in fabrics with substandard antibacterial and deodorizing properties; the inkjet printing produced pale colors and uneven fabric coloring, with significant color difference between the polyester and cotton fibers; and the rubbing fastness and washing fastness were only grade 1-2. Overall, the printing quality and wearability were far inferior to Example 4 of this invention. Specific performance indicators are shown in Table 2 below.

[0131] Table 2

[0132]

[0133] Comparative Example 3

[0134] (1) Prepare commercially available cyclodextrin-based deodorizing finishing agents

[0135] Commercially available cyclodextrin-based deodorizing finishing agents were selected as finishing agents for fabric treatment and are prepared for future use.

[0136] (2) Application and drying of commercially available cyclodextrin-based deodorizing finishing agents

[0137] A polyester / cotton blended fabric with a polyester / cotton mass ratio of 61 / 39, with polyester yarn in the warp and cotton yarn in the weft, was selected. The fabric was laid flat on a workbench, and a commercial cyclodextrin-based deodorizing finishing agent was evenly sprayed onto the fabric surface using a digital inkjet printer, with the liquid content controlled at 10%. The fabric was then placed in an oven and dried at 90°C for 5 minutes.

[0138] (3) Inkjet printing

[0139] The pre-treated and dried fabric is fixed on a digital inkjet printer, and inkjet printing is performed using four colors of reactive dye ink: cyan, magenta, yellow, and black. The printing resolution is set to 600×600dpi, and the droplet size is 10pL.

[0140] (4) Drying and steam color fixing

[0141] The printed fabric is first pre-dried at 80℃ for 3 minutes, then placed in a steam oven and steamed at 102℃ saturated steam pressure for 10 minutes to fully fix the dye. After steaming, it is washed with water, soaped, and dried to obtain the finished printed fabric.

[0142] Effect Evaluation 3

[0143] The performance of the polyester / cotton blended printed fabrics prepared in Comparative Example 3 and Example 5 was compared. Comparative Example 3 used a commercially available cyclodextrin-based deodorizing finishing agent. The resulting fabric not only had poor deodorizing effect, but also had light printing color, significant color difference between polyester and cotton fibers, and rubbing fastness and washing fastness of only grade 1-2. Its antibacterial performance was also far lower than that of Example 5 of the present invention. The overall performance was significantly different from that of the present invention. The specific performance indicators are shown in Table 3 below.

[0144] Table 3

[0145]

[0146] Deodorizing effect:

[0147] Table 4 below shows the deodorization rate test results of polyester / cotton blended fabrics prepared by the KH550 modified ZnO-based composite pretreatment solution of the present invention for four typical odor gases: ammonia, acetic acid, isovaleric acid, and 2-nonenal. Parallel verification was set up in Examples 1-5. The higher the deodorization rate value, the better the deodorization performance.

[0148] Table 4

[0149]

[0150] The test results show that the polyester / cotton blended fabric prepared by this invention exhibits excellent overall deodorizing performance, effectively removing alkaline odors (ammonia), acidic odors (acetic acid, isovaleric acid), and aldehyde odors (2-nonenal). It demonstrates broad-spectrum deodorization and strong practicality. Specifically, the deodorization rates are ≥86% for ammonia, ≥88% for acetic acid, ≥96% for isovaleric acid, and ≥93% for 2-nonenal. The deodorization effect on isovaleric acid is the best, reaching up to 97%, effectively removing the core odor components of sweat and body odor. Furthermore, the deodorization rate fluctuations in parallel tests of Examples 1-5 are extremely small, with fluctuations of only 1% for ammonia, acetic acid, isovaleric acid, and 2-nonenal, demonstrating the strong reproducibility and stability of the pretreatment process of this invention, and its potential for industrial-scale mass production. In summary, the polyester / cotton blended fabric prepared by this invention combines excellent broad-spectrum deodorizing performance with stable process repeatability, making it highly valuable for removing various odors.

[0151] The polyester / cotton blend printed fabrics obtained in Examples 1-5 of this invention underwent systematic performance testing, and the results are as follows:

[0152] 1. Excellent printing uniformity. Combined with... Figure 6 It is known that the polyester / cotton blended fabric treated by the method of the present invention has neat and clear edges of inkjet printed patterns without ink droplet bleeding, and the fabric surface has uniform and bright color. Polyester and cotton fibers can achieve synchronous and uniform coloring, effectively overcoming the uneven printing defects caused by the difference in hydrophilicity and hydrophobicity between the two types of fibers in traditional processes. The K / S value of the fabric is improved by more than 30% compared with conventional pretreatment processes, and the printing fineness, dry and wet rubbing fastness and soap washing fastness all meet the requirements of industrial production.

[0153] 2. Excellent antibacterial and deodorizing effects. (From...) Figure 7 It is known that the present invention uses a nano-metal oxide compound system to endow fabrics with broad-spectrum and efficient antibacterial properties, with an inhibition rate of over 99.9% against Staphylococcus aureus and Escherichia coli; relying on the high specific surface area and photocatalytic effect of nanomaterials, it can efficiently adsorb and decompose odor substances such as ammonia, acetic acid, isovaleric acid, and 2-nonenal, and has excellent deodorization performance.

[0154] 3. Good water wash resistance and stability. (Combined) Figure 5 It is known that the silane coupling agent and polyethylene glycol diglycidyl ether form a covalent cross-linked network on the fiber surface, which stably anchors the nano-functional components. After 50 standard water washes, the fabric retains more than 85% of its antibacterial and deodorizing functions, and the printing color does not show significant decay. Its performance is significantly better than conventional physical adsorption and simple finishing processes.

[0155] 4. High industrial application value. This invention can utilize existing conventional digital printing equipment to achieve pretreatment, inkjet printing, and functional finishing in one integrated process. Compared to the traditional "printing + independent functional finishing" model, it effectively simplifies the process flow, reduces equipment investment, energy consumption, and water consumption, aligning with the trend of green printing and dyeing development. The resulting fabric possesses both uniform and high-definition printing effects and long-lasting antibacterial and deodorizing properties, making it widely applicable in the fields of clothing, home textiles, and functional textiles.

[0156] The core improvements and key advantages of this invention compared to existing technologies are as follows:

[0157] 1. Effectively solves the problem of uniformity in inkjet printing of polyester / cotton blended fabrics, significantly improving printing quality: This invention utilizes the synergistic effect of silane coupling agent and polyethylene glycol diglycidyl ether in the composite pretreatment solution to specifically improve the performance difference between the hydrophobic properties of polyester and the hydrophilic properties of cotton fibers. Polyethylene glycol diglycidyl ether constructs a hydrophilic network layer on the polyester surface, while the silane coupling agent combines with the hydroxyl groups of cotton fibers to neutralize the surface negative charge, reducing lateral ink penetration. This makes the ink droplet spreading behavior on the two fibers more consistent, ultimately achieving synchronous and uniform coloring of polyester and cotton fibers. The color difference ΔE between the two is less than 1.0, the printed pattern has clear edges without penetration, and the color is uniform and bright. The K / S value (color depth) is improved by more than 30% compared with conventional pretreatment processes, and the printing fineness and color fastness both meet industrial production standards.

[0158] 2. Achieving integrated processing in one step, simplifying the process and saving energy: This invention integrates antibacterial and deodorizing functional ingredients with printing pretreatment agents, completing printing adaptation modification and functional finishing simultaneously in the pretreatment stage. There is no need to add an additional antibacterial and deodorizing posttreatment process. Compared with the traditional "printing + finishing" process, it significantly shortens the processing flow, reduces equipment investment, energy consumption and water consumption, avoids the problem of poor compatibility between traditional functional finishing agents and printing inks, avoids the decline in printing quality, and conforms to the industry development direction of green printing and dyeing.

[0159] 3. Excellent antibacterial and deodorizing properties with strong wash resistance and long-lasting and stable function: This invention adopts a nano-metal oxide compound system, which, through the synergistic effect of metal ion release, photocatalytic active oxygen generation, and physical damage, endows the fabric with broad-spectrum and highly efficient antibacterial properties. After 50 washes, the antibacterial rate against Staphylococcus aureus and Escherichia coli can still reach over 99.9%. At the same time, the nano-metal oxide, with its high specific surface area and photocatalytic effect, can efficiently adsorb and decompose odor molecules such as ammonia and acetic acid. After 50 washes, the deodorization rate against ammonia reaches over 86%, and the deodorization rate against acetic acid reaches over 88%, both meeting the ≥80% limit standard in the claims. The deodorization rate against isovaleric acid reaches over 96%, and the deodorization rate against 2-nonenal reaches over 93%. By self-crosslinking polyethylene glycol diglycidyl ether with silane coupling agent and covalently bonding with the hydroxyl groups of cotton fibers, a stable crosslinking network is formed, which firmly anchors the nano-metal oxides to the fiber surface, significantly improving the wash fastness of functional components and solving the problems of easy detachment and insufficient durability of functional components in the existing technology.

[0160] 4. Simple process, strong applicability, and easy to industrialize: The processing method of this invention can be implemented on conventional digital printing equipment without large-scale modification of existing equipment. The processes of pretreatment solution preparation, spraying and drying, inkjet printing, and drying and steaming are simple, easy to control, and convenient to operate. Furthermore, this method is applicable to polyester / cotton blended fabrics of any polyester-to-cotton fiber ratio, and can also be extended to inkjet printing and functional finishing of other dissimilar fiber blends or interweavings. It has a wide range of applications and strong industrial application value.

[0161] 5. High safety and no adverse effects: The raw materials used in this invention, such as silane coupling agents and nano metal oxides, are highly safe and contain no residual chlorine or other irritating components, thus avoiding skin irritation. The functional components are fixed by chemical bonding, with no risk of falling off, and will not affect the inherent excellent properties of the fabric such as moisture absorption and breathability, thus balancing functionality and wearing comfort.

[0162] In summary, this invention constructs a synergistic system of silane coupling agent-polyethylene glycol diglycidyl ether-nano metal oxide, which fundamentally solves the problem of uneven inkjet printing on polyester / cotton blended fabrics, while simultaneously endowing the fabrics with efficient and durable antibacterial and deodorizing functions. The overall process is simple and controllable, has a wide range of applications, does not require large-scale modification of production equipment, has strong industrial applicability, and has important industrial application value.

[0163] Of course, the above description is not intended to limit the present invention, and the present invention is not limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present invention should be protected by the present invention.

Claims

1. A method for uniform inkjet printing on polyester / cotton blended fabrics that also possess antibacterial and deodorizing properties, characterized in that, Includes the following steps: (1) Preparation of composite pretreatment solution: The composite pretreatment solution includes silane coupling agent, nano metal oxide, polyethylene glycol diglycidyl ether, pH adjuster and deionized water; (2) Application and drying of pretreatment solution: The composite pretreatment solution obtained in step (1) is applied to the surface of polyester / cotton blended fabric and then dried. (3) Inkjet printing: inkjet printing is performed on the dried fabric; (4) Color fixing treatment: The printed fabric is subjected to color fixing treatment.

2. The method for uniform inkjet printing of polyester / cotton blended fabrics with antibacterial and deodorizing properties according to claim 1, characterized in that: The composite pretreatment solution is composed of the following components by mass percentage: 1.0%–5.0% silane coupling agent, 0.2%–3.0% nano-metal oxide, 0.5%–2.0% polyethylene glycol diglycidyl ether, with the balance being deionized water and pH adjuster.

3. The method for uniform inkjet printing of polyester / cotton blended fabrics with antibacterial and deodorizing properties according to claim 1, characterized in that: The silane coupling agent is one or a combination of at least two of γ-methacryloxypropyltrimethoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, γ-mercaptopropyltrimethoxysilane, γ-mercaptopropyltriethoxysilane, γ-aminopropyltriethoxysilane, γ-glycidoxypropyltrimethoxysilane, and γ-glycidoxypropyltriethoxysilane.

4. The method for uniform inkjet printing of polyester / cotton blended fabrics with antibacterial and deodorizing properties according to claim 1, characterized in that: The nano-metal oxide is one or a combination of at least two of nano-titanium dioxide, nano-zinc oxide, nano-silica, nano-zirconia, and nano-alumina; the nano-metal oxide exists in a sol or gel state in the composite pretreatment solution.

5. The method for uniform inkjet printing of polyester / cotton blended fabrics with antibacterial and deodorizing properties according to claim 1, characterized in that: The composite pretreatment solution has a pH of 4.0–10.0, a viscosity of 5–50 mPa·s at 25°C, a surface tension of 25–35 mN / m, and a nanoparticle size of 20–400 nm.

6. The method for uniform inkjet printing of polyester / cotton blended fabrics with antibacterial and deodorizing properties according to claim 1, characterized in that: In step (2), the composite pretreatment liquid is applied to the surface of the polyester / cotton blended fabric by spraying, and the liquid content is controlled at 5% to 20%, and the drying temperature is 80℃ to 100℃.

7. The method for uniform inkjet printing of polyester / cotton blended fabrics with antibacterial and deodorizing properties according to claim 1, characterized in that: In step (3), inkjet printing uses reactive dye ink for printing.

8. The method for uniform inkjet printing of polyester / cotton blended fabrics with antibacterial and deodorizing properties according to claim 1, characterized in that: In step (4), the color-fixing treatment is carried out by steam color-fixing, and the steaming conditions are: temperature 100℃~110℃, heat treatment for 5~15min under saturated steam atmosphere.

9. A polyester / cotton blend printed fabric prepared by the method according to any one of claims 1 to 8, characterized in that: The polyester and cotton fibers in the fabric can be colored simultaneously and evenly, and the printed pattern has a clear outline and no bleeding color difference. After 50 standard water washes, the antibacterial rate against Staphylococcus aureus and Escherichia coli is over 99.9%, and the deodorization rate against ammonia is ≥80%, acetic acid is ≥80%, isovaleric acid is ≥90%, and 2-nonenal is ≥85%.

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