Preparation method of nanometer silver antibacterial and deodorant super-soft sofa fabric

Abstract

This invention relates to the field of textile technology and discloses a method for preparing a nano-silver antibacterial and deodorizing ultra-soft sofa fabric. The fabric includes a fiber substrate and a three-dimensional polymer coating in situ cross-linked on its surface. The finishing working solution uses water as a solvent and contains branched polyethyleneimine, nano-silver dispersion, terminal epoxy-modified polydimethylsiloxane, and glacial acetic acid. During solution preparation, glacial acetic acid is used to adjust the pH to 4.5–5.0, causing the polyamine groups to protonate and form a kinetic dormancy state, ensuring stability at room temperature. After padding, a three-stage gradient baking process is performed, where the bound acetic acid is desorbed and vaporized upon heating, restoring the active amine groups to undergo in-situ ring-opening addition cross-linking with the terminal epoxy groups. Polyethyleneimine anchors the nano-silver through multi-toothed chelation, and epitaxial siloxane segments form a comb-like hydrophobic isolation layer. This invention inhibits metal-catalyzed yellowing of the fabric, significantly improves the wash fastness of the antibacterial components, and imparts an excellent soft touch to the fabric through molecular-level lubrication.

Description

Technical Field

[0001] This invention relates to the field of textile technology, specifically to a method for preparing a nano-silver antibacterial and deodorizing ultra-soft sofa fabric. Background Technology

[0002] With people's increasing requirements for home hygiene, the antibacterial and deodorizing functions of sofa fabrics have become a basic research direction in the industry. Nano silver, due to its broad-spectrum antibacterial properties, is widely used in the finishing process of textiles. In order to enable nano silver particles to adhere to the fabric for a long time to improve wash fastness, existing technologies usually use amine-containing polymers as fixatives or crosslinking agents to build an adhesion network on the fiber surface.

[0003] However, this conventional finishing system has several technical defects that restrict each other in actual production and application. When free polyamine groups coexist with catalytically active silver ions within the system, they are prone to oxidative dehydrogenation reactions under light and heat conditions, accompanied by the aggregation of metal particles. This directly leads to obvious yellowing or browning of the fabric. At the same time, in order to resist the mechanical shearing during the washing process and the reduction in surface tension caused by the detergent, existing technologies often increase the amount of crosslinking agent to construct a high-density crosslinked coating. However, the introduction of a large number of crosslinking nodes increases the micro-friction coefficient between fiber yarns, resulting in a stiff feel to the treated fabric and a loss of the softness and comfort required for sofa fabrics. In addition, this multi-component reactive finishing solution has poor stability during room temperature storage in the actual workshop. The active amine groups and crosslinking groups are very prone to pre-crosslinking reactions, causing abnormally high viscosity of the working solution or even gel demulsification, making the finishing solution lose its fluidity and uniformity, and unable to meet the process requirements of continuous padding in large-scale production. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a method for preparing nano-silver antibacterial and deodorizing ultra-soft sofa fabric. This method solves the problems of existing amine-containing nano-silver antibacterial textiles being prone to oxidation and yellowing during finishing, high-density cross-linking leading to stiff fabric feel, and multi-component reactive finishing solutions being prone to pre-cross-linking and demulsification when stored at room temperature.

[0005] To achieve the above objectives, the present invention provides the following technical solution: In a first aspect, the present invention provides a nano-silver antibacterial and deodorizing ultra-soft sofa fabric, which adopts the following technical solution: A nano-silver antibacterial and deodorizing ultra-soft sofa fabric includes a fiber substrate and a three-dimensional polymer coating in situ cross-linked and fixed to the surface of the fiber substrate. The three-dimensional polymer coating is formed by impregnation and curing with a finishing working solution. The finishing working solution uses water as a solvent, and the initial concentration of its raw materials includes: branched polyethyleneimine 5.0-15.0 g / L; nano-silver aqueous dispersion 10.0-30.0 g / L; terminal epoxy polyether modified polydimethylsiloxane 20.0-50.0 g / L; and glacial acetic acid for adjusting the pH of the finishing working solution system to 4.5-5.0. In the three-dimensional polymer coating, branched polyethyleneimine serves as a cross-linking backbone, anchoring nano-silver particles in the nano-silver aqueous dispersion through its multidentate amine groups. The terminal epoxy groups of the terminal epoxy polyether modified polydimethylsiloxane undergo ring-opening addition with the amine groups and are incorporated into the cross-linking backbone, and its polydimethylsiloxane segments extend outward to form a semi-permeable hydrophobic isolation protective layer with a comb-like topology.

[0006] By adopting the above technical solution, the present invention constructs a three-dimensional network on the surface of the fiber substrate that takes into account both coordination fixation and physical isolation, thus achieving a better balance between washability, anti-yellowing, and soft touch. Specifically, the primary, secondary, and tertiary amine groups distributed on the branched polyethyleneimine molecular chain can provide a large number of nitrogen atom lone pair electrons, which form a multidentate complex structure with the empty orbitals on the surface of the nano-silver particles. This chemical anchoring effect embeds the metal particles inside the polymer skeleton, which can better resist surface tension changes and mechanical shearing during the washing process. Under heat, the epoxy groups at both ends of the terminal epoxy polyether modified polydimethylsiloxane molecule undergo nucleophilic ring-opening addition reactions with the active primary and secondary amines on the branched polyethyleneimine chain segments, generating an insoluble three-dimensional polymer skeleton in situ at the fiber interface. This process consumes the easily oxidized active free amine groups, reducing the generation of chromophores that cause yellowing of fabrics from the source. As the cross-linking reaction proceeds, the polydimethylsiloxane backbone inherent in the silicone oil is forced to extend outward with the cross-linking point as the core; the siloxane segments themselves have low surface energy and are relatively flexible, assembling into a comb-like hydrophobic isolation layer around the cross-linking network. It blocks the penetration of peripheral oxygen molecules and liquid water into the inner silver ion active center, reducing the risk of silver particles oxidizing, discoloring, or swelling and washing away. At the same time, these outward-extending chain segments act as molecular-level lubricants between fiber contact surfaces, alleviating the problem of fabric stiffness caused by cross-linking. The comb-like mesh maintains a certain molecular free path, allowing odor-causing gas molecules to still diffuse into the network, contact with silver particles, and degrade, thus maintaining the fabric's odor removal ability.

[0007] Preferably, the branched polyethyleneimine has a weight-average molecular weight of 800-1200, and the molar ratio of primary amine, secondary amine and tertiary amine in its macromolecular backbone is 1:2:1.

[0008] By adopting the above technical solution, the branched polyethyleneimine with this specific molecular weight and functional group ratio is selected mainly to balance the crosslinking density and the spacing between coordination nodes. A low molecular weight can easily lead to poor crosslinking and film formation, while an excessively high molecular weight will increase the viscosity of the working solution and affect its penetration into the fiber. The 1:2:1 amine group ratio can retain enough reactive groups for crosslinking network construction, and also retain an appropriate amount of tertiary amine groups for complexing silver ions, so as to promote the balance between film formation and fixation.

[0009] Preferably, the surface coating stabilizer of the aqueous dispersion of nano-silver is polyvinylpyrrolidone with a weight average molecular weight of 10,000 to 40,000, the solid content of the system is 1,000 to 2,000 mg / L, the average hydrodynamic diameter of the internal nano-silver crystals is distributed between 10 and 30 nm, and the Zeta potential of the system is greater than +35 mV. By adopting the above technical solution, the introduction of polyvinylpyrrolidone utilizes steric hindrance to maintain the dispersion state of nano-silver in the initial aqueous phase; the hydrodynamic diameter of 10-30 nm facilitates the penetration of silver particles into the amorphous region of the fiber and the pores of the yarn; the high zeta potential, combined with electrostatic repulsion, reduces the aggregation and precipitation of particles in the working fluid, which helps to improve the uniformity of silver ion distribution on the fabric.

[0010] Preferably, the epoxy-terminated polyether modified polydimethylsiloxane is prepared by a method comprising the following steps: under nitrogen protection, hydrogen-terminated polydimethylsiloxane with an active hydrogen content of 0.05wt% to 0.15wt% is mixed with allyl-terminated epoxy polyether with a degree of polymerization of 5 to 15, and the molar ratio of allyl to silane-hydrogen bonds is controlled to be 1.10 to 1.20:1; after heating to 80 to 85°C, a caster catalyst is added dropwise until the effective platinum content is 20 to 50 ppm, and the system temperature is maintained at 90 to 100°C for continuous reaction for 3.0 to 4.0 hours; after the characteristic absorption peak of Si-H bond disappears, low molecular weight volatiles are removed by vacuum decompression. By adopting the above technical solution, the modified silicone oil obtained by the synthesis method contains polyether segments, which can provide hydrophilic compatibility in aqueous microemulsions, allowing it to be evenly dispersed with branched polyethyleneimine and nano-silver in the working solution; its polydimethylsiloxane backbone provides hydrophobicity and lubricity to the cured fabric; controlling the active hydrogen content and degree of polymerization can ensure the relative accuracy of the epoxy value of the product and prevent excessive unreacted polyether from causing the fabric to absorb water and turn yellow.

[0011] Secondly, the present invention provides a method for preparing nano-silver antibacterial and deodorizing ultra-soft sofa fabric, which adopts the following technical solution: A method for preparing nano-silver antibacterial and deodorizing ultra-soft sofa fabric, comprising the following steps: S1. Branched polyethyleneimine, glacial acetic acid, nano-silver aqueous dispersion and terminal epoxy polyether modified polydimethylsiloxane are added sequentially to deionized water and stirred continuously at a constant temperature to prepare a microemulsion finishing working solution. During this process, the pH value of the system is controlled to be stable in the slightly acidic range of 4.5 to 5.0 by adding glacial acetic acid dropwise, which promotes the protonation of the amine matrix on the branched polyethyleneimine to form kinetic dormancy. S2. The fiber substrate is guided into a padding tank containing a microemulsion finishing solution for padding treatment. S3. The impregnated fiber substrate is continuously fed into the tenter frame and passes through the pre-drying and dehumidification section, the forced desorption section for promoting the desorption of bound glacial acetic acid from the polyamine network and vaporization and dissociation, and the high-temperature crosslinking section for driving the free polyamine groups to undergo in-situ crosslinking and ring-opening addition with the terminal epoxy groups. S4. After baking, the fabric is cooled in the cooling zone and then rolled into a flat roll for distribution.

[0012] By adopting the above technical solution, this invention improves the process problems of premature demulsification of multi-component working solutions and side reactions caused by high-temperature baking by means of thermodynamic and kinetic level regulation. In the room temperature solution preparation stage, glacial acetic acid is added to control the pH value in a slightly acidic environment. The active amino groups on polyethyleneimine will combine with hydrogen ions to form ammonium salt cations. After the lone pair electrons of nitrogen atoms are occupied, they no longer have a strong nucleophilic attack ability, which blocks the premature cross-linking with terminal epoxy groups at room temperature, so that the finishing working solution maintains stable viscosity during storage. In the subsequent baking stage, the fabric first passes through the pre-drying and dehumidification section to remove most of the moisture. After entering the forced desorption section, as the temperature rises, the bound acetic acid is desorbed and vaporized, causing the ammonium salt cations to lose protons again and return to free active amine groups. In the subsequent high-temperature crosslinking section, these reactivated polyamine groups quickly undergo ring-opening addition with the terminal epoxy silicone oil to form a crosslinking network. This staged design avoids the direct thermal dehydration reaction of acetate with polyamine groups at high temperature to generate inert amide bonds, ensuring the normal progress of the epoxy ring-opening reaction and improving the gel crosslinking degree of the coating.

[0013] Preferably, step S1 is implemented as follows: Deionized water is added to a constant temperature mixing vessel at 20-25°C and stirring is started. Branched polyethyleneimine is added first and stirred until completely dissolved. Glacial acetic acid is slowly added dropwise under continuous stirring to adjust the pH value. Then, nano-silver aqueous dispersion and terminal epoxy polyether modified polydimethylsiloxane are added slowly in sequence, and the speed is increased to 250 rpm and the mixture is stirred at a constant temperature for 30 minutes.

[0014] By adopting the above technical solutions, standardizing the feeding sequence and stirring parameters can avoid instantaneous cross-linking caused by excessively high local concentrations. First, dissolve the polyethyleneimine and adjust the acidity and protonation, then add the silicone oil component. Combined with constant temperature and appropriate speed, this helps to achieve uniform particle size distribution in the microemulsion system and reduce the risk of phase separation.

[0015] Preferably, in step S2, the temperature of the padding groove is controlled at 20-25°C, a two-dip two-roll process is adopted, and the liquid content of the fabric is controlled at 70%-80% by setting the roller line pressure.

[0016] By adopting the above technical solution, the two-dip and two-roll process utilizes the alternating action of mechanical extrusion and wetting to allow the working fluid to penetrate into the fiber bundle; the rolling groove temperature of 20-25°C moderately restricts the molecular thermal motion of the system, and combined with a specific liquid carrying rate, it can basically ensure that the total amount of active components loaded on the fabric surface is relatively constant, providing a material basis for subsequent crosslinking.

[0017] Preferably, in step S3, the specific process parameters for the three-stage gradient baking are as follows: the temperature of the pre-drying and dehumidification section is set to 90-100℃, and the residence time is 2.0-3.0 minutes; the temperature of the forced desorption section is set to 120-130℃, and the residence time is 1.0-1.5 minutes; the temperature of the high-temperature crosslinking section is set to 160-170℃, and the residence time is 60-90 seconds.

[0018] By adopting the above technical solution, the gradient temperature zone setting matches the physical and chemical change requirements at different stages. 90-100℃ is mainly used for water evaporation without initiating deep cross-linking; 120-130℃ meets the volatilization conditions of glacial acetic acid, promoting the accelerated release of acid molecules; and the short-term thermal shock at 160-170℃ provides the energy required for epoxy ring opening, while avoiding the breakage of glycosidic bonds in cellulose material caused by prolonged high temperature, which would lead to a decrease in fabric strength.

[0019] Preferably, in step S3, the exhaust fan speed of the tenter frame in the pre-drying and dehumidification section is set to 40% to 50% of the rated power; the exhaust fan speed in the forced desorption section is increased to 90% to 100% of the rated power; and the exhaust fan speed in the high-temperature crosslinking section is reduced back to 40% of the rated power.

[0020] By adopting the above technical solution, the dynamic adjustment of exhaust power adapts to the mass transfer requirements of different reaction stages. The higher exhaust power in the forced desorption stage can promptly remove the volatilized acetic acid gas and maintain the low partial pressure state of the fabric surface to promote desorption. The reduced exhaust power in the high-temperature crosslinking stage helps to maintain the ambient temperature inside the setting machine, reduce heat loss, and maintain a stable surface crosslinking temperature.

[0021] Preferably, in step S2, the continuous running speed of the fiber substrate entering the rolling groove is controlled to be 15-25 m / min; and in step S4, the cooling zone is treated with cold water circulation to reduce the fabric surface temperature to 35°C before flat-width roll-up and unloading.

[0022] By adopting the above technical solution, the speed range setting takes into account both immersion time and actual industrial production efficiency. After the fabric cross-links, it is quickly cooled in the cold water circulation zone, which can promptly limit the thermal movement of polymer chain segments, consolidate the spatial topology of the coating, and thus reduce the deformation of the fabric surface or the adhesion of the coating caused by heat accumulation during roll forming.

[0023] This invention provides a method for preparing a nano-silver antibacterial and deodorizing ultra-soft sofa fabric. It has the following beneficial effects: 1. This invention improves the storage stability of multi-component antibacterial finishing working solution at room temperature. By introducing glacial acetic acid during the solution preparation stage, the pH value of the system is controlled in the slightly acidic range of 4.5 to 5.0, which promotes the protonation of the active amine matrix on the branched polyethyleneimine molecular chain to form ammonium salt cations. This process causes the lone pair electrons of the nitrogen atom of the amine group to be occupied, temporarily losing its nucleophilic attack ability, thereby blocking the premature crosslinking addition of the amine group with the epoxy-terminated polyether modified polydimethylsiloxane at room temperature. This avoids abnormal viscosity increase or gel demulsification caused by pre-crosslinking during the storage of the working solution in the workshop, and ensures the continuity of the fabric impregnation process.

[0024] 2. This invention inhibits the oxidative yellowing of fabrics and improves the wash fastness of antibacterial components. After removing acetic acid through gradient baking, the reactivated amine groups undergo in-situ ring-opening addition with the terminal epoxy groups of modified silicone oil, consuming a large number of free amine groups that are easily oxidized and discolored. Polyethyleneimine anchors the nano-silver particles in the cross-linked backbone through multi-tooth chelation, while the grafted siloxane segments assemble into a hydrophobic isolation layer on the periphery of the network. This three-dimensional structure, which combines chemical anchoring and physical isolation, not only cuts off the high-risk reaction path of fabric yellowing but also blocks the penetration of washing liquid and oxygen molecules in the air into the inner silver particles, reducing the risk of oxidation and discoloration of silver particles and the washing loss rate.

[0025] 3. This invention improves the defect of high cross-linking density fabrics being prone to stiffness, maintaining the soft touch required for sofa fabrics. During the in-situ cross-linking and curing process, terminal epoxy polyether modified polydimethylsiloxane is introduced into the polyethyleneimine backbone. The polydimethylsiloxane main chain contained therein is forced to extend outward with the cross-linking point as the core, forming a comb-like topological arrangement. The outwardly extending siloxane chain segments themselves have low surface energy and are relatively flexible. They are distributed between the fiber contact surfaces and play a lubricating role at the molecular level, reducing the increase in the coefficient of friction between fibers caused by the high molecular cross-linking network, so that the fabric can obtain a durable antibacterial coating without losing its softness. Attached Figure Description

[0026] Figure 1 This is a graph showing the viscosity change of the working fluid of the present invention after standing at room temperature. Figure 2 This is a graph showing the relationship between the gelation rate of the polymer coating of the present invention and the continuous extraction time; Figure 3 This is a curve showing the color difference change of the fabric during accelerated aging according to the present invention; Figure 4 This is a graph showing the change in silver retention rate of the fabric as a function of the number of washes. Figure 5 This is a comparative test diagram of the bending stiffness of the fabric under different treatment conditions according to the present invention. Detailed Implementation

[0027] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] The main raw materials and reagents used in the following examples and comparative examples have the following sources and specifications. Reagents not specifically mentioned are all commercially available analytical grade or higher grade products.

[0029] The aqueous dispersion of nano-silver has polyvinylpyrrolidone (CAS No. 9003-39-8, weight-average molecular weight 10000-40000) as a surface coating stabilizer. The solid content of the system is 1000-2000 mg / L. The average hydrodynamic diameter of the internal nano-silver (CAS No. 7440-22-4) crystals is distributed between 10 and 30 nm. The original pH of the system is 6.0-7.0, and the Zeta potential is greater than +35 mV.

[0030] Branched polyethyleneimine (CAS No. 9002-98-6) has a weight-average molecular weight of 800-1200, and the molar ratio of primary amine, secondary amine and tertiary amine in the macromolecular backbone is 1:2:1.

[0031] Hydrogen-terminated polydimethylsiloxane (CAS No. 70900-21-9) has silicon-hydrogen bonds at both ends and an active hydrogen content of 0.05wt% to 0.15wt%.

[0032] Allyl-terminated epoxy polyether, with the molecular structure formula as follows: The degree of polymerization m is 5 to 15.

[0033] The cassiterite catalyst, chemically named platinum-1,3-divinyl-1,1,3,3-tetramethyldisiloxane complex (CAS No. 68478-92-2), has an effective platinum content of 20–50 ppm.

[0034] Preparation Example 1: This preparation example provides a method for preparing epoxy-terminated polyether-modified polydimethylsiloxane, including the following steps: In a jacketed reactor equipped with a condenser, mechanical stirrer, and nitrogen protection, hydrogen-containing polydimethylsiloxane (active hydrogen content of 0.10 wt%) and allyl-terminated epoxy polyether (degree of polymerization m of 10) are introduced, and the molar ratio of allyl to silane-hydrogen bond is controlled at 1.15:1. The temperature inside the reactor was raised to 82°C, and the Castel catalyst was added dropwise to make the effective platinum content in the system reach 35 ppm; the exothermic reaction was controlled, and the system temperature was maintained at 95°C, and the reaction was continuously stirred at a constant temperature for 3.5 hours. Real-time monitoring at 2120cm using infrared spectroscopy -1 The characteristic absorption peak of the Si-H bond was detected. After the absorption peak completely disappeared, the low molecular weight volatiles were removed by vacuum decompression at -0.09MPa at 110℃. The material was then cooled and discharged to obtain terminal epoxy polyether modified polydimethylsiloxane with a dynamic viscosity of 450mPa·s at 25℃ and an epoxy value of 0.06eq / 100g.

[0035] Preparation Example 2: This preparation example provides a method for preparing epoxy-terminated polyether-modified polydimethylsiloxane, including the following steps: In a jacketed reactor equipped with a condenser, mechanical stirrer, and nitrogen protection, hydrogen-containing polydimethylsiloxane (active hydrogen content of 0.05 wt%) and allyl-terminated epoxy polyether (degree of polymerization m of 5) are introduced, and the molar ratio of allyl to silane-hydrogen bond is controlled to be 1.10:1. The temperature inside the reactor was raised to 80°C, and the Castel catalyst was added dropwise to make the effective platinum content in the system reach 20 ppm; the exothermic reaction was controlled, the system temperature was maintained at 90°C, and the reaction was continuously stirred at a constant temperature for 3.0 hours. Real-time monitoring at 2120cm using infrared spectroscopy -1 The characteristic absorption peak of the Si-H bond was detected. After the absorption peak completely disappeared, the low molecular weight volatiles were removed by vacuum decompression at -0.09MPa at 110℃. The material was then cooled and discharged to obtain terminal epoxy polyether modified polydimethylsiloxane with a dynamic viscosity of 280mPa·s at 25℃ and an epoxy value of 0.04eq / 100g.

[0036] Preparation Example 3: This preparation example provides a method for preparing epoxy-terminated polyether-modified polydimethylsiloxane, including the following steps: In a jacketed reactor equipped with a condenser, mechanical stirrer, and nitrogen protection, hydrogen-containing polydimethylsiloxane (active hydrogen content of 0.15 wt%) and allyl-terminated epoxy polyether (degree of polymerization m of 15) are introduced, and the molar ratio of allyl to silane-hydrogen bond is controlled to be 1.20:1. The temperature inside the reactor was raised to 85°C, and the Castel catalyst was added dropwise to make the effective platinum content in the system reach 50 ppm; the exothermic reaction was controlled, the system temperature was maintained at 100°C, and the reaction was continuously stirred at a constant temperature for 4.0 hours. Real-time monitoring at 2120cm using infrared spectroscopy -1 The characteristic absorption peak of the Si-H bond was detected. After the absorption peak completely disappeared, the low molecular weight volatiles were removed by vacuum decompression at -0.09MPa at 110℃. The material was then cooled and discharged to obtain terminal epoxy polyether modified polydimethylsiloxane with a dynamic viscosity of 620mPa·s at 25℃ and an epoxy value of 0.09eq / 100g.

[0037] Example 1: This embodiment provides a method for preparing nano-silver antibacterial and deodorizing ultra-soft sofa fabric, including the following steps: S1. Add deionized water to a constant temperature mixing vessel at 25℃, start the folding blade mechanical stirrer, and then add 10.0 g / L of branched polyethyleneimine according to the formula concentration. Stir at 175 rpm until it is completely dissolved. While stirring continuously, slowly add glacial acetic acid to the vessel, and monitor it in real time with an online pH meter until the pH value of the system stabilizes at 4.8. Subsequently, 20.0 g / L of nano-silver aqueous dispersion and 35.0 g / L of epoxy-terminated polyether-modified polydimethylsiloxane prepared in Preparation Example 1 were slowly added in sequence. The speed of the mechanical stirrer was increased to 250 rpm, and the mixture was stirred at a constant temperature for 30 minutes to obtain a uniform semi-transparent microemulsion finishing working solution with a slightly pale yellow appearance and no visible flocculent matter or stratification.

[0038] S2. The pure polyester sofa fabric is continuously guided into a room temperature pad containing the above finishing solution at a speed of 20m / min. The temperature of the pad is controlled at 25℃. A two-dip and two-padding process is adopted, and the roller linear pressure is set to control the liquid content of the fabric to 75%.

[0039] S3. The impregnated sofa fabric is continuously fed into the tenter frame and undergoes three consecutive temperature zones for three-stage gradient baking: First, it enters the pre-drying and dehumidification zone, with the temperature set at 100℃, the exhaust fan speed set at 45% of the rated power, and the dwell time at 2.5 minutes; then, it enters the forced desorption zone, with the temperature set at 125℃, the exhaust fan speed set at 100% of the rated power, and the dwell time at 1.2 minutes; finally, it enters the high-temperature cross-linking zone, with the temperature set at 165℃, the exhaust fan speed set at 40% of the rated power, and the dwell time at 75 seconds.

[0040] S4. After baking, the fabric passes through a cooling zone with cold water circulation to lower the fabric surface temperature to 35°C before being rolled into a flat roll and unloaded to obtain nano-silver antibacterial and deodorizing ultra-soft sofa fabric.

[0041] Example 2: This embodiment provides a method for preparing nano-silver antibacterial and deodorizing ultra-soft sofa fabric, including the following steps: S1. Add deionized water to a constant temperature mixing vessel at 20℃, start the folding blade mechanical stirrer, and then add 5.0 g / L of branched polyethyleneimine according to the formula concentration. Stir at 150 rpm until it is completely dissolved. While stirring continuously, slowly add glacial acetic acid to the vessel, and monitor it in real time with an online pH meter until the pH value of the system stabilizes at 4.5. Subsequently, 10.0 g / L of nano-silver aqueous dispersion and 20.0 g / L of epoxy-terminated polyether-modified polydimethylsiloxane prepared in Preparation Example 2 were slowly added in sequence. The speed of the mechanical stirrer was increased to 250 rpm, and the mixture was stirred at a constant temperature for 30 minutes to obtain a uniform semi-transparent microemulsion finishing working solution with a slightly pale yellow appearance and no visible flocculent matter or layering.

[0042] S2. The pure polyester sofa fabric is continuously guided into a room temperature pad containing the above finishing solution at a speed of 15m / min. The temperature of the pad is controlled at 20℃. A two-dip and two-padding process is adopted, and the roller linear pressure is set to control the liquid content of the fabric to 70%.

[0043] S3. The impregnated sofa fabric is continuously fed into the tenter frame and undergoes three consecutive temperature zones for three-stage gradient baking: First, it enters the pre-drying and dehumidification zone, with the temperature set at 90℃, the exhaust fan speed set at 40% of the rated power, and the dwell time at 2.0 minutes; then, it enters the forced desorption zone, with the temperature set at 120℃, the exhaust fan speed set at 90% of the rated power, and the dwell time at 1.0 minute; finally, it enters the high-temperature cross-linking zone, with the temperature set at 160℃, the exhaust fan speed set at 40% of the rated power, and the dwell time at 60 seconds.

[0044] S4. After baking, the fabric passes through a cooling zone with cold water circulation to lower the fabric surface temperature to 35°C before being rolled into a flat roll and unloaded to obtain nano-silver antibacterial and deodorizing ultra-soft sofa fabric.

[0045] Example 3: This embodiment provides a method for preparing nano-silver antibacterial and deodorizing ultra-soft sofa fabric, including the following steps: S1. Add deionized water to a constant temperature mixing vessel at 25℃, start the folding blade mechanical stirrer, and then add 15.0 g / L of branched polyethyleneimine according to the formula concentration. Stir at 200 rpm until it is completely dissolved. While stirring continuously, slowly add glacial acetic acid to the vessel, and monitor it in real time with an online pH meter until the pH value of the system stabilizes at 5.0. Subsequently, 30.0 g / L of nano-silver aqueous dispersion and 50.0 g / L of epoxy-terminated polyether-modified polydimethylsiloxane prepared in Preparation Example 3 were slowly added in sequence. The speed of the mechanical stirrer was increased to 250 rpm, and the mixture was stirred at a constant temperature for 30 minutes to obtain a uniform semi-transparent microemulsion finishing working solution with a slightly pale yellow appearance and no visible flocculent matter or stratification.

[0046] S2. The pure polyester sofa fabric is continuously guided into a room temperature pad containing the above finishing solution at a speed of 25 m / min. The temperature of the pad is controlled at 25°C. A two-dip and two-padding process is adopted, and the roller linear pressure is set to control the liquid content of the fabric to 80%.

[0047] S3. The impregnated sofa fabric is continuously fed into the tenter frame and undergoes three consecutive temperature zones for three-stage gradient baking: First, it enters the pre-drying and dehumidification zone, with the temperature set at 100℃, the exhaust fan speed set at 50% of the rated power, and the dwell time at 3.0 minutes; then, it enters the forced desorption zone, with the temperature set at 130℃, the exhaust fan speed set at 100% of the rated power, and the dwell time at 1.5 minutes; finally, it enters the high-temperature cross-linking zone, with the temperature set at 170℃, the exhaust fan speed set at 40% of the rated power, and the dwell time at 90 seconds.

[0048] S4. After baking, the fabric passes through a cooling zone with cold water circulation to lower the fabric surface temperature to 35°C before being rolled into a flat roll and unloaded to obtain nano-silver antibacterial and deodorizing ultra-soft sofa fabric.

[0049] Example 4: This embodiment provides a method for preparing nano-silver antibacterial and deodorizing ultra-soft sofa fabric, including the following steps: S1. Prepare two equal portions of deionized water in a constant-temperature mixing vessel at 25℃. Start the folding-blade mechanical stirrer, and then add 10.0 g / L of branched polyethyleneimine to each portion of deionized water according to the formula concentration. Stir at 175 rpm until completely dissolved. While stirring continuously, slowly add glacial acetic acid dropwise to the first solution, monitoring in real time with an online pH meter, until the pH value of the system stabilizes at 4.5. Slowly add glacial acetic acid dropwise to the second solution, monitoring in real time with an online pH meter, until the pH value of the system stabilizes at 5.0. Subsequently, 20.0 g / L of nano-silver aqueous dispersion and 35.0 g / L of epoxy-terminated polyether-modified polydimethylsiloxane prepared in Preparation Example 1 were slowly added to the two systems in sequence. The speed of the mechanical stirrer was increased to 250 rpm, and the mixture was stirred at a constant temperature for 30 minutes to obtain the first finishing working solution and the second finishing working solution. Both of them were semi-transparent microemulsion finishing working solutions with a slightly pale yellow appearance and no visible flocculent matter or stratification.

[0050] S2. Pure polyester sofa fabric is continuously guided into a room temperature padding tank containing the first finishing working solution at a speed of 20 m / min, and cotton-polyester blended sofa fabric is continuously guided into a room temperature padding tank containing the second finishing working solution at a speed of 20 m / min. The temperature of the padding tank is controlled at 25℃. A two-dip and two-padding process is adopted, and the roller linear pressure is set to control the liquid carrying rate of both fabrics to 75%.

[0051] S3. The two types of impregnated sofa fabrics are continuously fed into a tenter frame and baked in three consecutive temperature zones in a three-stage gradient: First, they enter the pre-drying and dehumidification zone, with the temperature set at 100℃, the exhaust fan speed set at 45% of the rated power, and the dwell time at 2.5 minutes; then, they enter the forced desorption zone, with the temperature set at 125℃, the exhaust fan speed set at 100% of the rated power, and the dwell time at 1.2 minutes; finally, they enter the high-temperature cross-linking zone, with the temperature set at 165℃, the exhaust fan speed set at 40% of the rated power, and the dwell time at 75 seconds.

[0052] S4. After baking, the fabric passes through a cooling zone with cold water circulation to lower the fabric surface temperature to 35°C before being rolled into a flat roll and unloaded, thus obtaining two different types of nano-silver antibacterial and deodorizing ultra-soft sofa fabrics with different substrates.

[0053] Comparative Example 1: Compared with Example 1, the difference is that glacial acetic acid is not added in step S1 to adjust the pH value (i.e., to maintain the naturally alkaline pH of the system), while the rest are the same.

[0054] Comparative Example 2: Compared with Example 1, the difference is that the forced desorption section at 125°C is removed in step S3, and the baking process is changed to two stages (i.e., after pre-baking and dehumidifying at 100°C for 2.5 minutes, it directly enters the high-temperature crosslinking at 165°C for 75 seconds), while the rest are the same.

[0055] Comparative Example 3: The difference from Example 1 is that the formulation in step S1 does not include the terminal epoxy polyether modified polydimethylsiloxane obtained from Preparation Example 1, while the rest are the same.

[0056] Comparative Example 4: The difference from Example 1 is that branched polyethyleneimine is not added to the formulation in step S1, but all other aspects are the same.

[0057] Comparative Example 5: Compared with Example 1, the difference is that in step S1, "branched polyethyleneimine and terminal epoxy polyether modified polydimethylsiloxane prepared from Example 1" are replaced with an equal amount (45.0 g / L) of commercially available conventional non-crosslinked amino silicone oil (e.g., conventional linear amino silicone oil with an ammonia value of 0.6), and all other steps are the same.

[0058] Test Example 1: Take 500 mL of each of the microemulsion finishing working solutions prepared in Example 1 and Comparative Example 1, place them in glass beakers with sealed caps, and transfer them to a constant temperature water bath set at 25°C for static incubation.

[0059] The absolute viscosity of the samples during the settling process was measured using an NDJ-79 rotational viscometer. The test time points were set at 0h, 12h, 24h, 48h, and 72h. Before each measurement, the viscometer was turned on and pre-stirred at a low speed for 2 minutes to eliminate the influence of thixotropy. After the reading stabilized, the absolute viscosity value was recorded. Each group of samples was measured in triplicate, and the arithmetic mean was taken.

[0060] At the set test time points and settling intervals, the appearance of the liquid in the glass beaker was visually observed, and the critical time when the system changed from a uniform semi-transparent state to turbidity, the appearance of visible flocculation, or obvious separation of water and oil phases was recorded.

[0061] Table 1: Test results of viscosity and appearance of the finishing working fluid after standing at room temperature Reference Figure 1 According to the data in Table 1, the rheological behavior and physical stability of Example 1 and Comparative Example 1 under room temperature static conditions are different. In Comparative Example 1, the working solution was kept in a naturally alkaline environment without the addition of glacial acetic acid to adjust the pH value, and its initial viscosity began to rise nonlinearly in the following dozen hours. At room temperature of 25°C, a large-scale ring-opening addition reaction occurred with the epoxy groups of polydimethylsiloxane modified with terminal epoxy polyether. This pre-crosslinking that occurred in the mixing tank caused the macromolecular chain segments to expand rapidly and crosslink into a network. After standing for about 58 hours, it exceeded the physical solubility limit of the microemulsion system, causing thermodynamic instability and complete demulsification and stratification. Such a working fluid is very easy to clog the infusion pipeline in practical applications and cannot meet the needs of textile mills for continuous padding production for several days.

[0062] In Example 1, the viscosity of the working fluid only fluctuated slightly during the 72-hour observation period. The introduction of glacial acetic acid precisely controlled the pH of the system within the slightly acidic range, causing the polyamine groups to adsorb hydrogen protons and convert into ammonium salt cations. After the lone pair electrons of the nitrogen atom were occupied by hydrogen protons, steric hindrance and electrostatic repulsion were formed in both spatial conformation and charge distribution, causing it to lose its nucleophilic attack ability on epoxy groups. The kinetic dormancy mechanism constructed through acid-base balance suppressed the in-situ crosslinking side reaction under normal temperature conditions. The thermodynamic regulation extended the storage period of the multi-component reactive finishing solution and eliminated the risk of production instability caused by abnormal sudden changes in the viscosity of the working fluid in the rolling mill.

[0063] Test Example 2: Take the fabrics from Example 1 and Comparative Example 2 after baking and curing, and cut out multiple sets of standard size test samples of 10cm×10cm in parallel. In order to accurately measure the coating quality, cut out multiple pieces of unprocessed blank pure polyester sofa fabric of the same area in advance, and take their average weight as the benchmark control weight W0. Place all test fabrics in a vacuum drying oven at 80℃ and dry them to constant weight. Use an analytical balance to accurately weigh the initial weight W1 of each set of fabrics with cured coating.

[0064] The polymer coating on the fabric surface was extracted by reflux using a Soxhlet extractor. Anhydrous ethanol was used as the extraction solvent to fully dissolve the uncrosslinked polyethyleneimine and modified silicone oil components. The water bath heating temperature of the extractor was set to 85°C, and the siphon reflux rate was maintained at about 6 to 8 times per hour. To investigate the dynamic exfoliation process of the crosslinked network in a highly polar solvent, the continuous extraction time of multiple parallel samples was independently set to four observation points: 2h, 4h, 8h, and 12h.

[0065] After reaching the corresponding extraction time point, the fabric samples of the corresponding group were taken out, rinsed with an appropriate amount of deionized water to remove the solvent adsorbed on the surface, and then transferred to a vacuum drying oven at 80°C to dry to constant weight. The final mass W2 of the fabric after extraction was accurately weighed, and the actual gel rate of the polymer coating was obtained by calculating (W2-W0) / (W1-W0)×100%. Each group of tests was performed in parallel three times and the arithmetic mean was taken.

[0066] Table 2: Results of gelation rate determination of polymer coating on fabric surface at different extraction times Reference Figure 2 According to the data in Table 2, Example 1 and Comparative Example 2 showed objective differences in the solvent resistance of the coating. This difference in macroscopic gelation rate directly reflects the different cross-linking densities of the polymer three-dimensional network. It was observed that in the early exploratory stage of the laboratory, the coated fabric without specific thermal stage treatment was very easy to become sticky and fall off when soaked in polar solvents. The data of Comparative Example 2 confirmed this phenomenon. After the forced desorption section at 125°C was removed, the fabric went directly from the 100°C dehumidification environment to the 165°C high-temperature cross-linking zone. The bound acetic acid retained in the polymer network underwent a large temperature step. Under high temperature conditions, acetate that fails to volatilize and dissociate in time is prone to undergo irreversible thermal dehydration side reactions with polyamine groups on polyethyleneimine, generating chemically inert amide bonds. This directly occupies the active sites originally used for reaction with epoxy groups, resulting in a setback in ring-opening addition efficiency. A large amount of modified silicone oil and low molecular weight polymer that have not been incorporated into the main skeleton remain free inside the coating. After 12 hours of reflux extraction, they are continuously dissolved by anhydrous ethanol, and the gelation rate eventually drops below 60%, forming a relatively loose isolation layer. The data from Example 1 shows the opposite result, with the gelation rate remaining stable at over 92% after 12 hours of continuous extraction. The 125℃ forced desorption section precisely matches the boiling point and desorption activation energy of glacial acetic acid. With the assistance of the exhaust fan, the bound acetic acid is rapidly extracted from the fabric surface under low partial pressure. The ammonium salt cations thus smoothly lose their protons, exposing the free amine groups with nucleophilic attack activity. This method of isolating the desorption and cross-linking reactions using a temperature gradient ensures that the polyamine groups are in a suitable reaction conformation when entering the 165℃ high-temperature region, driving the epoxy ring-opening addition conversion and forming a stable three-dimensional skeleton in situ at the fiber interface.

[0067] Test Example 3: Nine test samples (5cm x 5cm each) were cut from the baked and cured fabrics of Examples 1 to 4 and Comparative Examples 3 to 5. These samples were divided into three groups of three, corresponding to different test time points. The initial chromaticity coordinates (L0, a0, b0) of each sample were measured using a computer colorimeter under a D65 standard light source. Each sample was randomly tested three times in different areas, and the average value was taken as the baseline data.

[0068] The test sample was fixed on the sample rack of the UV accelerated aging test chamber, and the test chamber's operating program was set to: irradiance of 0.71 W / m². 2The UVA-340 ultraviolet light irradiation and condensation heating at 60°C were alternated, with a single cycle set to 8 hours. The total duration of the continuous aging test was set to 72 hours.

[0069] Samples of the corresponding groups were taken out at the 24-hour, 48-hour, and 72-hour mark of the test run. After the samples were equilibrated at room temperature under standard atmospheric pressure for 2 hours, the chromaticity coordinates (L1, a1, b1) after aging were read again using a computer colorimeter. The average value of the total color difference ΔE of the samples at each mark was calculated according to the CIE1976 standard color difference formula, and the appearance of the yellowing state of the samples at the corresponding mark after 72 hours was recorded.

[0070] Table 3: Results of Measurement of Total Color Difference Value of Fabric under Artificial Accelerated Thermo-Oxidative and Ultraviolet Aging Reference Figure 3 According to the data in Table 3, the examples and comparative examples showed different color stability in the harsh environment of alternating ultraviolet radiation and heat and oxygen aging. In the early exploration stage, a process defect was observed: when free polyamine groups and active silver ions coexist in the system, photothermal conditions can easily induce a violent oxidative dehydrogenation reaction. Comparative Example 3 showed this defect. After removing the terminal epoxy polyether modified polydimethylsiloxane, the primary and secondary amine groups on the polyethyleneimine chain segment were completely free outside the crosslinking network. The total color difference value of the sample increased after 48 hours, and yellowish-brown patches appeared after 72 hours. Comparative Example 5, which attempted to replace the process with commercially available non-crosslinked amino silicone oil, also failed to block this chemical pathway. The linear amino silicone oil could only remain on the fiber surface through weak physical adsorption and could not effectively consume the highly active free amines on the substrate. This loose physical adhesion layer under continuous thermal expansion and contraction and photo-oxidative erosion caused the molecular chains to slip and the structure to break down. Oxygen molecules in the environment could still penetrate the defense and reach the interior of the amine group, ultimately showing a high yellowing color difference of more than 10.0. Comparative Example 4 lacked branched polyethyleneimine with multi-toothed chelating effect. The originally uniformly dispersed silver ions lost their anchoring support and spontaneously agglomerated under thermodynamic drive. The generated large elemental silver particles induced spectral absorption drift of surface plasma resonance effect under light, causing the fabric to appear grayish-black and dull, destroying the hue purity that the sofa fabric should have.

[0071] Data from Examples 1 to 4 collectively validated the effectiveness of the three-dimensional in-situ crosslinking network constructed in this scheme in suppressing yellowing. The incorporation of epoxy-terminated polyether-modified polydimethylsiloxane significantly consumed easily oxidized free polyamine groups, fundamentally interrupting the dehydrogenation crosslinking oxidation reaction that causes fabric yellowing. After in-situ ring-opening addition, the siloxane segments extending outside the polyethyleneimine backbone assembled into a dense comb-like topological barrier on the fabric surface. The establishment of this microscopic physical structure significantly hindered the penetration probability of oxygen molecules and water vapor into deep silver particles. The synergistic effect of this closed-loop chemical structure and physical microscopic barrier reduced the risk of metal-catalyzed oxidation under photothermal conditions, allowing the fabric to maintain a safe low total color difference value of less than 2.5 even after 72 hours of rigorous accelerated aging, effectively balancing long-lasting antibacterial performance with the fabric's appearance quality.

[0072] Test Example 4: Several pieces of fabric from Examples 1 to 4 and Comparative Examples 1 to 5 were baked and cured. Multiple test samples of uniform size 20cm×20cm were cut out in parallel. A standard washing machine conforming to GB / T8629 was used. Standard detergent was added and the samples were washed 10, 30 and 50 times in 40°C water. After reaching each preset washing node, the parallel samples of the corresponding group were taken out in sequence. After washing, the samples were hung to dry at 60°C.

[0073] The total silver content of the fabric under test was determined by inductively coupled plasma atomic emission spectrometry. Fabric samples before washing and after each washing stage were weighed and microwave digested. The retention rate of silver elements on the fabric surface under different washing cycles was calculated, and the average value of three parallel tests was taken for each group.

[0074] Fabric samples from each group were taken after 50 complete washing cycles. Based on the GB / T20944 standard for evaluating the antibacterial properties of textiles, Staphylococcus aureus and Escherichia coli were used as test bacteria, and the antibacterial rate of the fabric was determined by absorption method.

[0075] Fabric samples after 50 washes were placed in a sealed test chamber pre-filled with an initial concentration of 100 ppm ammonia and left to stand at 25°C for 24 hours. The residual ammonia concentration in the chamber was measured using a gas chromatograph, and the degradation rate of ammonia on the fabric was calculated to characterize the durability of the deodorizing effect.

[0076] Table 4: Silver retention rate and final antibacterial and deodorizing performance test results of fabrics in each group after different washing cycles. Reference Figure 4According to the data in Table 4, the present invention maintains stable antibacterial and deodorizing performance after undergoing high-intensity mechanical washing and surfactant erosion. This verifies the practical engineering value of the multi-component synergistic crosslinking structure in improving wash fastness. In conventional textile finishing systems, the shedding of functional particles is the main technical bottleneck that limits their service life. In the durability screening test, functional additives that rely solely on physical adsorption are unlikely to withstand the impact of modern washing conditions. The data from Comparative Example 4 reflects the consequences of lacking an anchoring skeleton. Without the introduction of branched polyethyleneimine, the nano-silver particles adhere to the fiber surface through intermolecular forces. After 50 washes, the silver retention rate drops sharply to 14.2%, and the antibacterial and deodorizing functions are diminished. Comparative Example 3 constructed an attachment network containing polyamine groups, but lacked the protection of an outer hydrophobic isolation layer. The hydrophilic polyethyleneimine segments easily absorb water and swell during prolonged washing, and the internally encapsulated silver ions are subsequently lost under mechanical shearing, causing the silver retention rate to drop to 43.8%. Comparative Example 5, which uses commercially available conventional non-crosslinked amino silicone oil for compounding, also suffers from insufficient durability. The linear silicone oil segments are difficult to form chemical bonds with the polyamine skeleton, and the physical coating peels off in sheets during repeated friction, failing to provide long-lasting washing protection.

[0077] In this embodiment, a stable three-dimensional polymer coating is established on the fabric micro-interface by in-situ crosslinking of polydimethylsiloxane modified with terminal epoxy polyether and polyamine groups. The polydentate amine groups of polyethyleneimine firmly chelate the metal particles in the nano-silver dispersion inside, and the siloxane segments attached to the periphery assemble into a hydrophobic barrier with comb-like topological features on the skeleton surface, reducing the probability of water molecules penetrating the underlying chelate network and offsetting the effect of surface tension attenuation caused by detergent. The superposition of multiple effects enables Example 1 to still have a silver retention rate of 91.4% after 50 consecutive washes, and the corresponding antibacterial rates of Escherichia coli and Staphylococcus aureus are both stable above 98%, providing long-term protection for home sofa fabrics in high-frequency washing environments.

[0078] Test Example 5: Take appropriate sizes of the baked and cured sofa fabric from Examples 1, 3, and 5, and simultaneously take a sufficient area of ​​blank pure polyester fabric without any finishing as a baseline control group. Place all fabrics in a standard atmospheric pressure constant temperature and humidity chamber with a temperature set at 20±2℃ and a relative humidity set at 65±5% for 24 hours to eliminate the internal deformation and internal stress generated in the fabric during processing.

[0079] Five standard strip test pieces, each measuring 25mm × 250mm, were cut parallel to each other along the warp and weft directions of the fabric in each group. The bending performance was measured using a computer-controlled fabric stiffness tester that meets the testing standards. The inclined plane suspension method was selected, and the inclined plane angle was set to 41.5°.

[0080] The test sample is laid flat on the horizontal worktable of the testing instrument. The instrument is started so that the sample moves along its longitudinal axis at a specified rate and extends beyond the edge of the worktable. When the extended part of the sample droops due to its own weight and its front edge just touches the inclined plane indicator line, the instrument automatically stops and records the extension length at this time, which is the bending length. Each group of samples is tested on both the front and back sides, and the arithmetic mean of all valid test data is taken. Then, the unit area mass of the fabric in each group is determined using a standard disc sampler and a precision electronic balance, and the bending stiffness in the warp and weft directions is calculated according to the test standard formula.

[0081] Table 5: Results of Warp and Weft Bending Stiffness Measurement for Fabrics in Each Group Reference Figure 5 According to the data in Table 5, the unfinished blank fabric possesses a basic physical morphology, with its warp and weft bending stiffness within the normal range. In actual research on functional modification of textiles, improving durability often requires constructing a high-density cross-linked network to restrict the relative slippage between fiber macromolecular chains and yarns, leading to fabric stiffness. The test results of Comparative Example 3 reflect the negative impact of the cross-linked structure on the physical rigidity of the fabric. After the epoxy polyether at the peel end is modified into polydimethylsiloxane, the three-dimensional polyamine skeleton formed by the in-situ curing of branched polyethyleneimine generates shrinkage stress on the fiber surface, causing the warp bending stiffness to increase to 5.58 cN·cm. 2 The fabric exhibits obvious hardening and stiffening characteristics.

[0082] In Example 1 of this scheme, the topological structure was designed in a directional manner at the micro interface. During the desorption and crosslinking stage, the terminal epoxy group undergoes ring-opening addition with the polyamine backbone, and the flexible polydimethylsiloxane segments are anchored to the periphery of the crosslinking network in the form of chemical bonds. The outwardly extending comb-shaped hydrophobic segments form a molecular-level lubricating pad between the fiber-to-fiber contact surfaces. The results showed that the warp and weft bending stiffness of Example 1 decreased compared to Comparative Example 3, and was even significantly lower than that of the untreated blank fabric, thus improving the bending flexibility of the fabric. When processing similar polymer film-forming systems, conventional techniques compensate for the loss of hand feel through physical compounding. Although Comparative Example 5, which used commercially available non-crosslinked amino silicone oil, reduced the stiffness value to some extent, the linear silicone oil molecules only randomly adhered to the coating surface through weak interactions, which easily led to local agglomeration and uneven lubrication distribution. In Example 1, the method of grafting comb-like structures outward from the main crosslinking skeleton ensured the uniformity and structural stability of the siloxane lubricating layer in spatial arrangement. While overcoming the fabric stiffness defect caused by high crosslinking density, it constructed a soft touch performance with engineering application value.

[0083] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A nano-silver antibacterial and deodorizing ultra-soft sofa fabric, characterized in that, The fabric comprises a fiber substrate and a three-dimensional polymer coating in situ cross-linked and fixed to the surface of the fiber substrate; the three-dimensional polymer coating is formed by impregnation and curing with a finishing working solution, wherein the finishing working solution uses water as a solvent, and the initial concentration of the raw materials for preparing the finishing working solution includes: Branched polyethyleneimine 5.0–15.0 g / L; Aqueous dispersion of nano-silver: 10.0–30.0 g / L; Epoxy-terminated polyether modified polydimethylsiloxane 20.0–50.0 g / L; And glacial acetic acid for adjusting the pH of the finishing working solution system to 4.5–5.

0.

2. The nano-silver antibacterial and deodorizing ultra-soft sofa fabric according to claim 1, characterized in that, The branched polyethyleneimine has a weight-average molecular weight of 800-1200, and the molar ratio of primary amine, secondary amine and tertiary amine in the macromolecular skeleton of the branched polyethyleneimine is 1:2:

1.

3. The nano-silver antibacterial and deodorizing ultra-soft sofa fabric according to claim 1, characterized in that, The surface coating stabilizer of the aqueous dispersion of nano-silver is polyvinylpyrrolidone with a weight average molecular weight of 10,000 to 40,000, the solid content of the system is 1,000 to 2,000 mg / L, the average hydrodynamic diameter of the internal nano-silver crystals is distributed between 10 and 30 nm, and the zeta potential of the system is greater than +35 mV.

4. The nano-silver antibacterial and deodorizing ultra-soft sofa fabric according to claim 1, characterized in that, The epoxy-terminated polyether-modified polydimethylsiloxane is prepared by a method comprising the following steps: Under nitrogen protection, hydrogen-terminated polydimethylsiloxane with an active hydrogen content of 0.05wt%–0.15wt% was mixed with allyl-terminated epoxy polyether with a degree of polymerization of 5–15, and the molar ratio of allyl to silane-hydrogen bonds was controlled at 1.10–1.20:

1. After heating to 80–85℃, a caster catalyst was added dropwise until the effective platinum content was 20–50 ppm. The system temperature was maintained at 90–100℃ for continuous reaction for 3.0–4.0 hours. After the characteristic absorption peak of Si-H bond disappeared, vacuum decompression was performed to remove low molecular weight volatiles.

5. A method for preparing nano-silver antibacterial, deodorizing, and ultra-soft sofa fabric, characterized in that, The preparation of the nano-silver antibacterial and deodorizing ultra-soft sofa fabric according to any one of 1-4 includes the following steps: S1. Branched polyethyleneimine, glacial acetic acid, nano-silver aqueous dispersion and terminal epoxy polyether modified polydimethylsiloxane are added sequentially to deionized water and stirred continuously at a constant temperature to prepare a microemulsion finishing working solution. In this step, the pH value of the system is strictly controlled to be stable in the slightly acidic range of 4.5 to 5.0 by adding glacial acetic acid dropwise, so as to promote the protonation of the amine matrix on the branched polyethyleneimine to form kinetic dormancy. S2. The fiber substrate is guided into a padding tank containing the microemulsion finishing working solution described in S1 for padding treatment. S3. The impregnated fiber substrate is continuously fed into the tenter frame and passes through the pre-drying and dehumidification section, the forced desorption section for promoting the desorption of bound glacial acetic acid from the polyamine network and vaporization and dissociation, and the high-temperature crosslinking section for driving the free polyamine groups to undergo in-situ crosslinking and ring-opening addition with the terminal epoxy groups. S4. After baking, the fabric is cooled in the cooling zone and then rolled into a flat roll for distribution.

6. The preparation method according to claim 5, characterized in that, The specific implementation method of step S1 is as follows: Add deionized water to a constant-temperature mixing vessel at 20–25°C and start stirring. First, add branched polyethyleneimine and stir until completely dissolved. Then, slowly add glacial acetic acid to adjust the pH value while continuously stirring. Subsequently, slowly add nano-silver aqueous dispersion and terminal epoxy polyether modified polydimethylsiloxane in sequence, and increase the speed to 250 rpm to continue constant-temperature mixing and stirring for 30 minutes.

7. The preparation method according to claim 5, characterized in that, In step S2, the temperature of the trough is controlled at 20-25℃, and a two-dip and two-roll process is adopted. The liquid content of the fabric is controlled at 70%-80% by setting the roller line pressure.

8. The preparation method according to claim 5, characterized in that, In step S3, the specific process parameters for the third-order gradient baking are as follows: The temperature of the pre-drying and dehumidification section is set to 90–100℃, and the residence time is 2.0–3.0 minutes; The temperature of the forced desorption section is set at 120–130°C, and the residence time is 1.0–1.5 minutes. The temperature of the high-temperature cross-linking section is set to 160–170°C, and the residence time is 60–90 seconds.

9. The preparation method according to claim 8, characterized in that, In step S3, the exhaust fan speed of the tenter frame is set to 40% to 50% of the rated power in the pre-drying and dehumidification section; the exhaust fan speed is increased to 90% to 100% of the rated power in the forced desorption section; and the exhaust fan speed is reduced back to 40% of the rated power in the high-temperature crosslinking section.

10. The preparation method according to claim 5, characterized in that, In step S2, the continuous running speed of the fiber substrate entering the rolling groove is controlled to be 15-25 m / min; and in step S4, the cooling zone is treated with cold water circulation to reduce the fabric surface temperature to 35°C before flat-width roll-up and unloading.

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