Colored fiber blended yarn and preparation process thereof

Abstract

The invention discloses a colored fiber blended yarn and a preparation process thereof, and relates to the technical field of textile yarns, the colored fiber blended yarn is composed of a first colored fiber and a second colored fiber which are mutually twisted and cohered, the first colored fiber is a cellulosic fiber, and the second colored fiber is a polyester fiber; a layer of antistatic hyperchromic film formed by in-situ thermal crosslinking is attached to the fiber surface and the fiber gaps of the blended yarn, and the antistatic hyperchromic film is prepared by demulsifying and crosslinking amphiphilic hyperbranched polysiloxane nano-emulsion under the heat setting condition. By constructing an anchoring network with both chemical bonding and physical entanglement, the washing fastness and anti-pilling capacity of the yarn are improved, meanwhile, by means of refractive index matching and a conductive structure, the color and luster of the yarn are improved, the frost white phenomenon is eliminated, the long-acting anti-static performance is achieved, and the physical performance and appearance are improved.

Description

Technical Field

[0001] This invention relates to the field of textile yarn technology, specifically to a colored fiber blended yarn and its preparation process. Background Technology

[0002] Currently, blended yarns are constructed from two or more fibers with different properties. The fibers are bonded together through a spinning process to form the yarn. Subsequent processing typically involves dyeing and finishing steps to impart specific colors, luster, and hand feel. In some standard processing scenarios, padding softeners, antistatic agents, or film-forming aids are used to improve the smoothness of the yarn surface and reduce static electricity buildup. In certain specific products, to achieve functional durability, high-concentration resins or adhesives are sometimes used to coat the yarn surface.

[0003] However, with the increasing demands of consumers for the performance and appearance of textiles, the construction of blended yarns based on traditional physical adsorption or simple coatings presents some problems or weaknesses. For example, due to the large differences in the physicochemical properties of the different fiber components, the finishing agent has poor adhesion to the yarn surface, and its function rapidly diminishes after repeated washing; or the yarn surface is prone to fuzzing caused by fiber wear and breakage, resulting in a whitish appearance and dull color; and it is difficult to achieve both long-lasting antistatic and anti-pilling properties without affecting the softness and breathability of the yarn, which urgently needs improvement. Summary of the Invention

[0004] The purpose of this invention is to provide a colored fiber blended yarn and its preparation process, which solves the problems existing in the background art.

[0005] To address the aforementioned technical problems, this invention provides a colored fiber blended yarn, composed of a first colored fiber and a second colored fiber twisted and interlocked together. The first colored fiber is cellulose fiber, and the second colored fiber is polyester fiber. An in-situ thermally cross-linked antistatic color-enhancing film is attached to the fiber surface and interfiber spaces of the blended yarn. This antistatic color-enhancing film is obtained by demulsification and cross-linking of an amphiphilic hyperbranched polysiloxane nanoemulsion under heat-setting conditions. The non-volatile components of the amphiphilic hyperbranched polysiloxane nanoemulsion include: a hyperbranched polysiloxane as a hydrophobic core, and hydrophilic color-enhancing segments, a first anchoring group, and a second anchoring segment grafted onto the hydrophobic core. Among them, the hydrophilic color-enhancing segment is a quaternized polyether segment with double bonds at the end group; the first anchoring group is an epoxy group or a blocked isocyanate group; and the second anchoring segment is a divinylbenzene-maleic anhydride copolymer and its derivative segments.

[0006] Preferably, the mass ratio of the first colored fiber to the second colored fiber is 30:70 to 60:40; the amount of antistatic color-enhancing film attached to the blended yarn is 0.5% to 3.0% of the total yarn mass.

[0007] Preferably, the degree of branching of the hyperbranched polysiloxane is 0.5~0.8, and the molecular weight distribution index is 1.2~1.8; the grafting molar ratio of the hydrophilic color-enhancing segment, the first anchoring group and the second anchoring segment on the surface of the hyperbranched polysiloxane is (2~4):(1~2):(1~2).

[0008] A process for preparing colored fiber blended yarn is also provided, comprising the following steps: S1. Preparation of amphiphilic hyperbranched polysiloxane nanoemulsion: Hydrogen-containing hyperbranched polysiloxane is dissolved in an anhydrous organic solvent. Under the action of platinum catalyst, quaternized polyether with double bonds, allyl glycidyl ether or blocked isocyanate monomer with double bonds, and divinylbenzene-maleic anhydride prepolymer are grafted sequentially through hydrosilylation reaction. After the reaction is completed, the solvent is removed by rotary evaporation under reduced pressure. A composite emulsifier is added, and deionized water is added dropwise under high speed stirring to induce phase inversion. The nanoemulsion is obtained by high shear dispersion. S2, Fiber pretreatment and drawing: The first colored fiber and the second colored fiber are made into strips respectively. In the drawing process, the nanoemulsion obtained in step S1 is uniformly sprayed onto the surface of the fiber strip by an atomizing spraying device to obtain the modified fiber strip. S3. Spinning and forming: The modified fiber strips are processed into yarn precursors through roving, spinning and winding processes; S4. Heat setting and crosslinking: The yarn precursor is placed in a heat setting device and subjected to gradient heating under tension control to trigger the demulsification of the nanoemulsion and cause the first anchoring group and the second anchoring chain segment to undergo crosslinking and curing reaction with the corresponding fiber substrate, forming an antistatic color-enhancing film in situ on the fiber surface. After natural cooling, colored fiber blended yarn is obtained.

[0009] Preferably, the specific operation of the hydrosilylation reaction in step S1 is as follows: Under nitrogen protection, hydrogen-containing hyperbranched polysiloxane and anhydrous toluene or xylene solvent are added to the reaction vessel, mechanical stirring is turned on and the temperature is raised to 70~90°C under reflux; first, quaternized polyether with double bonds and isopropanol chloroplatinate solution are added dropwise as catalysts, and the reaction is kept under reflux for 2~4 hours; then, allyl glycidyl ether or blocked isocyanate monomer with double bonds dissolved in the above solvent is added dropwise, and the reaction is kept under reflux for 1~2 hours; finally, vinyl-containing divinylbenzene-maleic anhydride prepolymer dissolved in the above solvent is added dropwise, and the temperature is raised to 90~110°C and the reaction is kept under reflux for 3~5 hours; during the reaction, the Si-H characteristic absorption peak at wavenumber 2100~2200cm⁻¹ is monitored by infrared spectroscopy until it disappears to determine the reaction endpoint.

[0010] Preferably, the specific operation of high shear dispersion in step S1 is as follows: The grafted polymer product is mixed with a composite emulsifier with an HLB value of 10-15 and pre-stirred at 300-500 rpm for 10-20 minutes at 40-60°C to make the system homogeneous. Then, deionized water was slowly added dropwise at a rate of 5-10 mL / min, while the rotation speed was adjusted to 10,000-15,000 rpm for shear emulsification until the system underwent phase inversion and formed a blue light emulsion with a particle size distribution in the range of 50-200 nm. Finally, the mixture is subjected to ultrasonic dispersion and degassing treatment for 30-60 minutes.

[0011] Preferably, in step S2, the nozzle pressure of the atomizing spray device is controlled at 0.3~0.6MPa, and the atomized particle size is controlled at 10~30μm; the spraying amount of nanoemulsion is controlled at 0.8%~3.5% of the dry weight of the fiber strip.

[0012] Preferably, the gradient heating process in step S4 includes: First stage: Heat to 100~120°C and keep warm for 3~5 minutes to remove moisture and allow the nanoemulsion to break down and spread. Second stage: Heat to 160~180°C and hold for 1~3 minutes to trigger the cross-linking reaction and anchor the divinylbenzene-maleic anhydride segments to the polyester fibers; Throughout the heat setting process, the yarn tension is controlled at 1.5~3.0 cN / dtex.

[0013] Preferably, the quaternized polyether with double bonds is an allyl polyoxyethylene ether quaternary ammonium salt; the preparation steps of the divinylbenzene-maleic anhydride prepolymer with vinyl side chains are as follows: maleic anhydride and p-divinylbenzene are dissolved in toluene or xylene solvent at a molar ratio of 1:(0.8~1.2), 0.5%~1.5% of azobisisobutyronitrile as an initiator and 3.0%~6.0% of α-methylstyrene dimer as a sulfur-free chain transfer agent are added as an initiator, and the mixture is heated to 90~110°C and refluxed for 4~6 hours under a nitrogen atmosphere, controlling the monomer conversion rate to 40%~60% to avoid gelation; after the reaction, the product is poured into excess n-hexane to precipitate, filtered, and washed more than 3 times in anhydrous diethyl ether to remove unreacted maleic anhydride monomer, and vacuum dried to obtain a soluble divinylbenzene-maleic anhydride prepolymer with unreacted vinyl side chains.

[0014] Preferably, in step S1, the mass ratio of hydrogen-containing hyperbranched polysiloxane, quaternized polyether with double bonds, allyl glycidyl ether, and divinylbenzene-maleic anhydride derivative is 100:(30~50):(10~20):(15~25).

[0015] Compared with the prior art, the present invention has the following beneficial effects: A cross-linked network with a dual anchoring mechanism is constructed on the yarn surface through a specific preparation process. This network can form a stable bond for different chemical properties of the fiber substrates in the blended yarn. For hydrophilic fibers, it achieves tight fixation through chemical bonding; for hydrophobic fibers, it achieves effective locking through physical entanglement and chemical interaction. This overcomes the defect of uneven adhesion of traditional finishing agents on the surface of heterogeneous fibers, allowing the functional layer to maintain its structural integrity after repeated washing and mechanical friction, thus giving the yarn excellent wash resistance.

[0016] The modified layer formed on the yarn surface has excellent optical adjustment function and charge dissipation ability. It can effectively fill the micropores and unevenness of the fiber surface, optimize the reflection path of light on the yarn surface, and make the incident light more able to enter the fiber interior and be absorbed. This visually enhances the color depth and brightness of the yarn, eliminates the whitening phenomenon caused by surface diffuse reflection, and the constructed conductive path can quickly release the charge accumulated on the fiber surface, giving the yarn a long-lasting antistatic ability and improving the comfort and safety of wearing it.

[0017] The formed flexible cross-linked film layer plays a microscopic bridging and binding role between fibers. Without destroying the original soft hand feel and fluffiness of the yarn, it restricts the slippage and extraction of fibers inside the yarn, effectively inhibiting the exposure of fiber ends and the formation of fuzz caused by friction. It avoids the problem of stiff hand feel caused by traditional resin finishing, and solves the appearance defects of easy pilling and fuzzing of blended yarns during long-term use, achieving a good balance between the physical and mechanical properties and the feel style of the yarn. Detailed Implementation

[0018] Example 1: This embodiment provides a colored fiber blended yarn. In this embodiment, the first colored fiber is colored cotton fiber, and the second colored fiber is colored polyester fiber. The mass ratio of the two is set to 30:70. This ratio aims to utilize the high strength of polyester and the hygroscopicity of cotton fiber to complement each other, while balancing the difference in triboelectricity between the two through subsequent modification. The amount of antistatic color-enhancing film attached to the blended yarn is controlled to be 0.5% of the total yarn mass, which is a low attachment amount design, designed to verify the functional performance under the thin film layer. The preparation process was strictly carried out according to the specified parameters: In S1, a hydrogen-containing hyperbranched polysiloxane with a branching degree of 0.5 and a molecular weight distribution index of 1.2 was selected as the hydrophobic core. Its spherical three-dimensional topology provided a low-viscosity platform for the high-density grafting of functional groups; the hydrosilylation reaction was carried out in anhydrous toluene, and the solid content of the reaction system was controlled at 40% to ensure a suitable stirring viscosity. The temperature was raised to 70°C and refluxed; the mass ratio of the feed materials was set as follows: hydrogen-containing hyperbranched polysiloxane: quaternized polyether with double bonds: allyl glycidyl ether: divinylbenzene-maleic anhydride prepolymer with vinyl side chains = 100:30:10:15; The design of the reaction sequence is crucial: First, add the hydrophilic color-enhancing segment allyl polyoxyethylene ether quaternary ammonium salt with the largest steric hindrance and isopropanol chloroplatinic acid, with a Pt content of 30 ppm, and react for 2 hours to ensure that it is distributed on the periphery of the sphere to provide optimal hydrophilicity and antistatic properties; then add allyl glycidyl ether, which provides the first anchoring group, and react for 1 hour. Finally, a purified divinylbenzene-maleic anhydride prepolymer with vinyl-containing side chains, after the removal of free monomers, was added dropwise. This prepolymer was prepared by free radical polymerization of divinylbenzene and maleic anhydride under the regulation of α-methylstyrene dimer, with Mn≈3500. The molar ratio of maleic anhydride to p-divinylbenzene was 1:0.8. The temperature was raised to 90℃ and the reaction was carried out for 3 hours. Since the prepolymer was strictly purified to remove the anhydride monomers that inhibited the catalyst, the system maintained its reactivity. The disappearance of the Si-H peak by infrared monitoring marked the end of the reaction. After the reaction, the intermediate obtained by rotary evaporation was a viscous liquid of grafted modified polymer. In the high-shear dispersion stage, a composite emulsifier with an HLB value of 10 was used. This emulsifier was composed of fatty alcohol polyoxyethylene ether AEO-9 and sorbitan monooleate Span-80 at a mass ratio of 6:4. This ratio was calculated and fine-tuned to strictly match HLB=10. A non-ionic composite emulsifier was chosen to avoid charge neutralization with the cationic quaternary ammonium salt groups on the molecular chain, which would lead to demulsification. The mixture was pre-stirred at 40°C, and deionized water was added dropwise at a rate of 5 mL / min at a rotation speed of 100 rpm. At 00 rpm, a nanoemulsion with a particle size distribution of about 50 nm was prepared. At this particle size, the emulsion exhibits a transparent blue light and has extremely strong penetration ability. In S2, an atomizing spray device was used, with the nozzle pressure set to 0.3 MPa, the atomized particle size controlled at 10 μm, and the spraying amount being 0.8% of the dry weight of the fiber strip, i.e., the effective component adhesion amount being 0.5%. The combination of nozzle pressure and particle size can ensure that the droplets are quickly captured and spread by the fiber aggregate, while preventing excessive pressure from causing the fiber strip structure to loosen, thus avoiding fiber damage caused by traditional impregnation processes. In S4, the gradient temperature treatment is key to forming a dense film: the first stage is held at 100℃ for 3 minutes to remove moisture and induce emulsion demulsification, causing the polymer molecular chains to rearrange on the fiber surface; the second stage is held at 160℃ for 1 minute, with the yarn tension controlled at 1.5 cN / dtex. This high temperature triggers the ring-opening etherification reaction of the first anchoring group, namely the epoxy group, with the hydroxyl group of the cotton fiber, as well as the physical entanglement and locking of the second anchoring chain segment with the polyester fiber, thereby constructing a wash-resistant interpenetrating network structure in situ; This embodiment successfully achieves the synergistic effect of antistatic and color enhancement functions with low cost by using a low grafting ratio and a thinner film layer design.

[0019] Example 2: This embodiment is another specific implementation of the technical solution based on Embodiment 1; in this embodiment, the first colored fiber is selected as colored viscose fiber, and the second colored fiber is selected as colored polyester fiber, with a mass ratio of 45:55. This ratio increases the content of cellulose fiber, which places higher demands on the hydrophilicity matching of the membrane layer; the amount of antistatic color-enhancing film attached to the blended yarn is controlled to be 1.8% of the total yarn mass; The parameters involved in the preparation process were adjusted adaptively within the specified range as follows: In S1, a hydrogen-containing hyperbranched polysiloxane with a branching degree of 0.65 and a molecular weight distribution index of 1.5 was selected, as the higher branching degree provides more reaction sites; xylene was used as the reaction solvent, and the reaction temperature was increased to 80℃ to improve the reaction rate; the feed mass ratio was adjusted to 100:40:15:20, appropriately increasing the proportion of hydrophilic segments and anchoring groups; the grafting reaction time was extended: the quaternized polyether reaction was carried out for 3 hours, and the allyl glycidyl... The oil-ether reaction was carried out for 1.5 hours, and the divinylbenzene-maleic anhydride derivative was reacted at 100℃ for 4 hours. At this time, the grafting molar ratio of the hydrophilic color-enhancing segment, the first anchoring group, and the second anchoring segment was approximately 3:1.5:1.5. The emulsification process used an emulsifier with an HLB value of 12, pre-stirred at 50℃, with a dripping rate of 7.5 mL / min, a shear speed of 12500 rpm, and a particle size controlled at 120 nm. The larger particle size and higher HLB value help to form a thicker hydration layer and improve the stability of the emulsion. In S2, the pressure of the atomizing spray device is 0.45 MPa, the atomizing particle size is 20 μm, and the spraying amount is 2.0% of the dry weight of the fiber strip; In S4, the heat setting stage is 110°C for 4 minutes in the first stage and 170°C for 2 minutes in the second stage, with a tension of 2.2 cN / dtex. The higher setting temperature promotes the mobility of the divinylbenzene-maleic anhydride chain segments, allowing them to penetrate deeper into the amorphous region of the polyester fiber. This embodiment uses a moderate degree of branching and grafting rate to achieve a balance between film integrity and softness in the antistatic color-enhancing film. The hydrophilic color-enhancing chain segments provide excellent refractive index matching at this time, effectively filling the microscopic unevenness of the fiber surface, thereby optically eliminating frost white and improving color depth.

[0020] Example 3: This embodiment is another specific implementation of the technical solution based on Embodiment 1; the first colored fiber is colored lyocell fiber, the second colored fiber is colored polyester fiber, and the mass ratio is 60:40; the antistatic color-enhancing film adhesion amount is 3.0%; this embodiment aims to investigate the limiting performance under high adhesion amount; The preparation process parameters were selected from a limited range of high values ​​to maximize the crosslinking density: in S1, the branching degree of the hydrogen-containing hyperbranched polysiloxane was 0.8, and the molecular weight distribution index was 1.8; the reaction temperature was 90℃; the mass ratio of feed materials was 100:50:20:25; the reaction time was 4 hours for quaternized polyether; then, a blocked isocyanate monomer with double bonds was added dropwise, specifically an allyl isocyanate methyl ethyl ketone oxime blocker, and the reaction was carried out for 2 hours; finally, a divinylbenzene-maleic anhydride prepolymer was added dropwise, with a monomer molar ratio of 1:1.2 during preparation. After being dissolved in xylene, it was added dropwise to the reaction system and reacted at 110℃ for 5 hours; the grafting molar ratio reached 4:2:2; under this high grafting rate, the first anchoring group is a blocked isocyanate group, which does not react at room temperature, but is deblocked in the high-temperature stage of S4, releasing highly active isocyanate groups to form urethane bonds with the hydroxyl groups of lyocell fibers, with bond energies much higher than ether bonds; emulsification was carried out using an emulsifier with an HLB value of 15, pre-stirred at 60℃, with a dripping rate of 10 mL / min, a rotation speed of 15000 rpm, and a particle size of 200 nm; In S2, the nozzle pressure is 0.6 MPa, the atomized particle size is 30 μm, and the coating amount is 3.5%. In S4, the heat setting is carried out at 120°C for 5 minutes in the first stage and at 180°C for 3 minutes in the second stage, with a tension of 3.0 cN / dtex. In this embodiment, the performance of the antistatic and color-enhancing film is maximized by grafting high-density functional groups and covering with a thicker film layer. In particular, the divinylbenzene-maleic anhydride copolymer segment in the second anchoring chain segment undergoes deep hydrophobic chain entanglement and partial transesterification reaction with the polyester fiber at high temperature, which significantly improves the yarn's washability and anti-pilling properties.

[0021] Example 4: This embodiment is another specific implementation of the technical solution based on Embodiment 1; the fiber ratio is 50:50; the antistatic color-enhancing film adhesion amount is 1.2%; the focus of this embodiment is to optimize the particle size distribution of the nanoemulsion to improve permeability; The process parameters were adjusted as follows: In S1, the feed ratio was 100:35:12:18; the grafting molar ratio was approximately 2.5:1.2:1.3; during emulsification, the dripping rate was strictly controlled at 6 mL / min, and the shearing time was extended to 20 minutes after the reverse rotation to obtain a blue emulsion with extremely uniform particle size, approximately 80 nm, and a PDI of less than 0.1; this narrow particle size distribution facilitates uniform capillary penetration of the emulsion into the fiber aggregate; in S2, the coating amount was controlled at 1.5%; In S4, the second stage of heat setting involves holding at 165℃ for 1.5 minutes with a tension of 1.8 cN / dtex. This embodiment focuses on examining the impact of the permeability of the nanoemulsion on the final performance. The smaller particle size helps the amphiphilic hyperbranched polysiloxane penetrate deep into the fiber gaps, covering not only the surface after film formation but also forming elastic microbridges between fibers. This helps reduce fiber slippage and shedding through internal bonding without affecting the feel, thereby suppressing pilling from the source and indirectly contributing to the durability of the color enhancement effect.

[0022] Example 5: This embodiment is another specific implementation based on the technical solution of Embodiment 1; the fiber ratio is 40:60; the antistatic color-enhancing film adhesion amount is 2.5%; this embodiment focuses on the synthesis optimization and application of divinylbenzene-maleic anhydride derivatives; The process parameters were optimized as follows: Before S1, a prepolymer was prepared: the divinylbenzene monomer was pre-washed with 5% NaOH solution to remove the polymerization inhibitor and dried with anhydrous magnesium sulfate. Toluene was used as a solvent to prepare a reaction solution with a monomer mass concentration of 25%. The monomer was added to the reactor, with a maleic anhydride to divinylbenzene molar ratio of 1:1. 1.0% of the total monomer mass of azobisisobutyronitrile initiator and 4.5% of the total monomer mass of α-methylstyrene dimer (sulfur-free chain transfer agent) were added. The addition of α-methylstyrene dimer can effectively control the molecular weight and avoid the poisoning effect of traditional thiol chain transfer agents on the platinum catalyst in the subsequent step S1. The system was refluxed at 105℃ for 5 hours. During this time, the monomer conversion rate was controlled at around 50% by sampling analysis. Stopping the reaction at this conversion rate effectively preserved the side-chain vinyl groups and prevented cross-linking and gelation. After the reaction, the product was poured into excess n-hexane to precipitate. After filtration, the filter cake was placed in anhydrous diethyl ether and washed three times, with the amount of diethyl ether each time being twice the volume of the filter cake, to thoroughly remove unreacted maleic anhydride monomer. Finally, it was vacuum dried to obtain a high-purity divinylbenzene-maleic anhydride prepolymer that is white powder, soluble in toluene, and retains an appropriate amount of unreacted vinyl groups in the side chains. Before being used in step S1, it was redissolved in toluene to prepare a 30% (w / w) solution. In step 1, the grafting reaction feed ratio is 100:45:18:22 to ensure sufficient grafting of each component; in step 4, the heat setting temperature is set to 175℃ to fully activate the second anchoring segment using a higher temperature. Although the maleic anhydride ring partially hydrolyzes into a dicarboxylic acid structure during emulsification, the carboxylic acid group undergoes dehydration under the high-temperature setting condition of 175℃, and reacts efficiently with the terminal hydroxyl groups of the polyester or reacts after dehydration to form anhydride; this embodiment aims to solve the problem of poor adhesion of traditional modifiers to the polyester surface by enhancing the chemical reactivity of the second anchoring segment; through chemical bonding for cotton and the dual action of physical entanglement and chemical bonding for polyester, a stable conductive color-enhancing network is constructed.

[0023] Comparative Example 1: This comparative example provides a conventional colored fiber blended yarn, whose fiber raw materials and proportions are the same as those in Example 2; the difference is that the chemical modification treatments in S1, S2 and S4 are not performed, and ordinary amino silicone oil is only coated by conventional finishing padding process after spinning; this comparative example does not form an antistatic color-enhancing film containing dual anchoring groups and hydrophilic color-enhancing segments, but mainly relies on physical adsorption, aiming to verify the wash resistance advantage of the chemically grafted film layer of the present invention.

[0024] Comparative Example 2: This comparative example provides a colored fiber blended yarn, whose preparation process is basically the same as that of Example 2. The difference is that, in step S1 when preparing the polymer, the second anchoring segment, namely the divinylbenzene-maleic anhydride derivative, was not grafted, but only the hydrophilic color-enhancing segment and the first anchoring group were grafted. This means that the modifier of this comparative example lacks a specific anchoring structure for the second colored fiber, namely polyester, and cannot form a complete dual anchoring mechanism. This aims to verify the contribution of the dual anchoring groups to the stability of the blended yarn system.

[0025] Comparative Example 3: This comparative example provides a colored fiber blended yarn, whose preparation process is basically the same as that of Example 2. The difference is that in the preparation of the polymer in step S1, instead of grafting hydrophilic color-enhancing segments (i.e., quaternized polyethers with double bonds), an equimolar amount of ordinary allyl polyether (i.e., without quaternary ammonium salts) is grafted. This results in the lack of ion-conducting pathways in the film layer of this comparative example, and its refractive index adjustment ability differs from that of specific segments. This aims to verify the core role of quaternized polyether segments in antistatic and color enhancement.

[0026] Comparative Example 4: This comparative example provides a colored fiber blended yarn, whose preparation process is basically the same as that of Example 2; the difference is that the polysiloxane skeleton used in step S1 is a linear polysiloxane instead of a hyperbranched polysiloxane; the linear structure results in a different film morphology and crosslinking density on the fiber surface compared with the hyperbranched spherical structure of the present invention, lacking the rheological advantages and multi-point anchoring ability brought by the core-shell structure, aiming to verify the necessity of the hyperbranched topology.

[0027] Verification test In order to objectively evaluate the performance advantages of the colored fiber blended yarn of the present invention, a systematic performance test was conducted on the yarn samples obtained in Examples 1-5 and Comparative Examples 1-4.

[0028] Test Standards Color enhancement effect, i.e. K / S value improvement rate: Referring to GB / T23979.2 standard, the K / S value of the yarn after being woven into knitted fabric is tested using a Datacolor650 colorimeter, and the percentage improvement relative to the untreated original yarn is calculated; Antistatic properties, also known as half-life: Tested according to GB / T12703.1 "Evaluation of electrostatic properties of textiles - Part 1: Electrostatic voltage half-life". The smaller the value, the stronger the antistatic ability. Washability, i.e., performance retention rate after 30 washes: After 30 standard washes according to GB / T8629 standard, the K / S value and antistatic effect are retested, and the retention rate is calculated. Anti-pilling property: Tested according to GB / T4802.1 "Determination of pilling property of textile fabrics by circular trajectory method". The higher the grade, the better, with grade 5 being the best, indicating stronger anti-friction pilling ability.

[0029] Specific testing process All samples were conditioned for 24 hours under standard atmospheric conditions, i.e., temperature 20±2℃ and relative humidity 65±4% before testing; each index was tested 5 times and the average value was taken as the final result to eliminate random errors.

[0030] Table 1 Analysis of the data in Table 1 shows that Examples 1-5 all exhibited excellent comprehensive performance, with K / S value improvement rates generally exceeding 18%, and electrostatic half-lives all less than 1 second, reaching the excellent antistatic standard. Comparing Example 2 with Comparative Example 1, it can be seen that the antistatic color-enhancing film formed by in-situ thermal crosslinking in this invention has a color-enhancing effect and antistatic performance far exceeding that of traditional physically coated silicone oil, and the performance retention rate after 30 water washes shows a qualitative leap, increasing from 20.5% to 94.2%. This is attributed to the specific chemical structure design, especially the synergistic effect of covalent bonds and physical entanglement. Comparing Example 2 with Comparative Example 2, it can be seen that when the second anchoring segment for polyester fibers, namely the divinylbenzene-maleic anhydride segment, is missing, although the initial performance is still acceptable, the wash resistance decreases significantly, from 94.2% to 65.4%. This mechanistically confirms that for blended yarn systems, a single anchoring segment for cellulose fibers is... This is insufficient; a second anchoring segment capable of strong interaction with the polyester must be introduced to construct a dual anchoring mechanism, ensuring the integrity of the film layer during multiple washing processes. Comparing Example 2 and Comparative Example 3, it can be seen that without the hydrophilic color-enhancing segment, i.e., quaternized polyether, the yarn has almost no antistatic ability, with a half-life of 45.2s and limited improvement in K / S value. This demonstrates the core role of this segment in providing ionic conductivity pathways and regulating surface refractive index; the conductive layer formed by its quaternary ammonium salt structure adsorbing air moisture is key to eliminating static electricity. Comparing Example 2 and Comparative Example 4, it can be seen that replacing hyperbranched polysiloxane with linear polysiloxane leads to a decrease in anti-pilling grade and wash resistance. This confirms the technical advantages of hyperbranched structures in constructing dense and flexible protective films; its spherical structure and numerous terminal functional groups provide more crosslinking sites, forming a stronger network structure that effectively inhibits fiber slippage.

[0031] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments that can be applied to other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A colored fiber blended yarn, characterized in that, It is composed of a first colored fiber and a second colored fiber that are twisted and interlocked with each other. The first colored fiber is cellulose fiber and the second colored fiber is polyester fiber. A layer of antistatic color-enhancing film formed by in-situ thermal cross-linking is attached to the fiber surface and the fiber gaps of the blended yarn. The antistatic color-enhancing film is obtained by demulsification and cross-linking of amphiphilic hyperbranched polysiloxane nanoemulsion under heat setting conditions. The non-volatile components of the amphiphilic hyperbranched polysiloxane nanoemulsion include: a hyperbranched polysiloxane as a hydrophobic core, and hydrophilic color-enhancing segments, a first anchoring group, and a second anchoring segment grafted onto the hydrophobic core. Among them, the hydrophilic color-enhancing segment is a quaternized polyether segment with double bonds at the end group; the first anchoring group is an epoxy group or a blocked isocyanate group; and the second anchoring segment is a divinylbenzene-maleic anhydride copolymer and its derivative segments.

2. The colored fiber blended yarn according to claim 1, characterized in that, The mass ratio of the first colored fiber to the second colored fiber is 30:70~60:40; the amount of antistatic color-enhancing film attached to the blended yarn is 0.5%~3.0% of the total yarn mass.

3. The colored fiber blended yarn according to claim 1, characterized in that, The degree of branching of the hyperbranched polysiloxane is 0.5~0.8, and the molecular weight distribution index is 1.2~1.8; the grafting molar ratio of the hydrophilic color-enhancing segment, the first anchoring group and the second anchoring segment on the surface of the hyperbranched polysiloxane is (2~4):(1~2):(1~2).

4. A process for preparing colored fiber blended yarn according to any one of claims 1 to 3, characterized in that, Includes the following steps: S1. Preparation of amphiphilic hyperbranched polysiloxane nanoemulsion: Hydrogen-containing hyperbranched polysiloxane is dissolved in an anhydrous organic solvent. Under the action of platinum catalyst, quaternized polyether with double bonds, allyl glycidyl ether or blocked isocyanate monomer with double bonds, and divinylbenzene-maleic anhydride prepolymer are grafted sequentially through hydrosilylation reaction. After the reaction is completed, the solvent is removed by rotary evaporation under reduced pressure. A composite emulsifier is added, and deionized water is added dropwise under high speed stirring to induce phase inversion. The nanoemulsion is obtained by high shear dispersion. S2, Fiber pretreatment and drawing: The first colored fiber and the second colored fiber are made into strips respectively. In the drawing process, the nanoemulsion obtained in step S1 is uniformly sprayed onto the surface of the fiber strip by an atomizing spraying device to obtain the modified fiber strip. S3. Spinning and forming: The modified fiber strips are processed into yarn precursors through roving, spinning and winding processes; S4. Heat setting and crosslinking: The yarn precursor is placed in a heat setting device and subjected to gradient heating under tension control to trigger the demulsification of the nanoemulsion and cause the first anchoring group and the second anchoring chain segment to undergo crosslinking and curing reaction with the corresponding fiber substrate, forming an antistatic color-enhancing film in situ on the fiber surface. After natural cooling, colored fiber blended yarn is obtained.

5. The preparation process of a colored fiber blended yarn according to claim 4, characterized in that, The specific operation of the hydrosilylation reaction in step S1 is as follows: Under nitrogen protection, hydrogen-containing hyperbranched polysiloxane and anhydrous toluene or xylene solvent are added to the reaction vessel, mechanical stirring is turned on and the temperature is raised to 70~90°C under reflux; first, quaternized polyether with double bonds and isopropanol chloroplatinate solution are added dropwise as catalysts, and the reaction is kept under reflux for 2~4 hours; then, allyl glycidyl ether or blocked isocyanate monomer with double bonds dissolved in the above solvent is added dropwise, and the reaction is kept under reflux for 1~2 hours; finally, vinyl-containing divinylbenzene-maleic anhydride prepolymer dissolved in the above solvent is added dropwise, and the temperature is raised to 90~110°C and the reaction is kept under reflux for 3~5 hours; during the reaction, the Si-H characteristic absorption peak at wavenumber 2100~2200cm⁻¹ is monitored by infrared spectroscopy until it disappears to determine the reaction endpoint.

6. The preparation process of a colored fiber blended yarn according to claim 4, characterized in that, The specific operation of high-shear dispersion in step S1 is as follows: The grafted polymer product is mixed with a composite emulsifier with an HLB value of 10-15 and pre-stirred at 300-500 rpm for 10-20 minutes at 40-60°C to make the system homogeneous. Then, deionized water was slowly added dropwise at a rate of 5-10 mL / min, while the rotation speed was adjusted to 10,000-15,000 rpm for shear emulsification until the system underwent phase inversion and formed a blue light emulsion with a particle size distribution in the range of 50-200 nm. Finally, the mixture is subjected to ultrasonic dispersion and degassing treatment for 30-60 minutes.

7. The preparation process of a colored fiber blended yarn according to claim 4, characterized in that, In step S2, the nozzle pressure of the atomizing spray device is controlled at 0.3~0.6MPa, and the atomized particle size is controlled at 10~30μm; the amount of nanoemulsion sprayed is controlled at 0.8%~3.5% of the dry weight of the fiber strip.

8. The preparation process of a colored fiber blended yarn according to claim 4, characterized in that, Step S4, the gradient temperature increase process, includes: First stage: Heat to 100~120°C and keep warm for 3~5 minutes to remove moisture and allow the nanoemulsion to break down and spread. Second stage: Heat to 160~180°C and hold for 1~3 minutes to trigger the cross-linking reaction and anchor the divinylbenzene-maleic anhydride segments to the polyester fibers; Throughout the heat setting process, the yarn tension is controlled at 1.5~3.0 cN / dtex.

9. The preparation process of a colored fiber blended yarn according to claim 5, characterized in that, The quaternized polyether with double bonds is an allyl polyoxyethylene ether quaternary ammonium salt; the preparation steps of the vinyl-containing divinylbenzene-maleic anhydride prepolymer are as follows: maleic anhydride and p-divinylbenzene are dissolved in toluene or xylene solvent at a molar ratio of 1:(0.8~1.2), and 0.5%~1.5% of azobisisobutyronitrile as an initiator and 3.0%~6.0% of α-methylstyrene dimer as a sulfur-free chain transfer agent are added. The mixture is heated to 90~110°C and refluxed for 4~6 hours under a nitrogen atmosphere, and the monomer conversion rate is controlled at 40%~60% to avoid gelation. After the reaction, the product is poured into excess n-hexane to precipitate, filtered, and washed more than 3 times in anhydrous diethyl ether to remove unreacted maleic anhydride monomers. The product is then vacuum dried to obtain a soluble divinylbenzene-maleic anhydride prepolymer with unreacted vinyl side chains.

10. The preparation process of a colored fiber blended yarn according to claim 4, characterized in that, In step S1, the mass ratio of hydrogen-containing hyperbranched polysiloxane, quaternized polyether with double bonds, allyl glycidyl ether and divinylbenzene-maleic anhydride derivative is 100:(30~50):(10~20):(15~25).