Preparation method and system of multi-layer composite functional polyester fabric

Abstract

The invention relates to the field of textile functional finishing, and discloses a preparation method and system of a multi-layer composite functional terylene fabric, the preparation method of the multi-layer composite functional terylene fabric comprises the following steps: selecting a high-twist polyester woven fabric as a base fabric, performing low-tension water washing and hot air drying on the base fabric, removing surface floating oil impurities, and drying the base fabric to obtain the multi-layer composite functional terylene fabric. The fiber surface capillary effect is adjusted; a water-blocking finishing liquid, an antibacterial finishing liquid and an anti-ultraviolet finishing liquid are prepared respectively, and the finishing liquids act on the surface layer, the middle layer and the bottom layer of the fabric respectively in a differential rolling and partitioned dipping mode in sequence, so that functional areas with spatial distribution differences are formed. In the invention, the water-blocking finishing liquid, the antibacterial finishing liquid and the anti-ultraviolet finishing liquid are respectively applied to the surface layer, the middle layer and the bottom layer of the fabric in a differential rolling and multi-groove partition dipping mode, so that the functional finishing is spatially distinguished in the thickness direction, and the problem of mutual interference of multifunctional agents is effectively avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of textile functional finishing, in particular to a preparation method and system of a multi-layer composite functional polyester fabric. BACKGROUND

[0002] With the development of intelligent manufacturing and functional textiles, traditional single-performance fabrics have been difficult to meet the comprehensive requirements of multiple functions, comfort and durability in high-performance scenarios such as outdoor clothing, medical protection and children's wear. Synthetic fiber materials represented by polyester fabrics are widely used in functional finishing research due to their stable structure and high physical strength. However, how to achieve the synergistic imparting of multiple functions while maintaining softness and air permeability remains an important issue in current fabric development.

[0003] Currently, the preparation of functional polyester fabrics is mostly carried out by single finishing liquid immersion or surface functional coating. The specific method is usually as follows: after the fabric is pretreated, functional finishing liquids such as water-repellent agents, antibacterial agents, and ultraviolet-resistant agents are applied sequentially or mixed, and corresponding functions are imparted through immersion, spraying or coating drying processes. Some improved schemes attempt to improve multi-functional stability through double immersion and double padding, multi-bath process or nano-coating technology. To enhance fastness, high-temperature setting or crosslinking agent fixing means are also used to make the finishing liquid more firmly attached to the fiber surface.

[0004] The above process still has the following disadvantages: since the above process generally uses functional agent stacking or mixing treatment method, interference or reaction between finishing liquids easily occurs, resulting in mutual weakening of functions. At the same time, because the functional components are mostly concentrated on the surface of the fabric, the binding force is weak and easy to fall off, and the wash resistance is poor; and the coating blocks the pores, seriously affecting the air permeability and softness of the fabric, making it difficult to balance comfort and multi-functional synergy, limiting its application in high-performance clothing and medical protection fields. SUMMARY

[0005] The purpose of the present application is to provide a preparation method and system of a multi-layer composite functional polyester fabric to solve the problems of single structure distribution, poor functional synergy, insufficient binding fastness and damaged air permeability and comfort in the prior art.

[0006] In order to achieve the above-mentioned application purpose, the following technical scheme is adopted: a preparation method of a multi-layer composite functional polyester fabric, comprising the following steps:

[0007] S1. Selecting a high-twist polyester woven fabric as a base fabric, washing it with low tension and drying it with hot air to remove surface oil impurities and adjust the fiber surface roughness;

[0008] S2. Respectively prepare water-repellent finishing liquid, antibacterial finishing liquid and anti-ultraviolet finishing liquid, and make each finishing liquid act on the surface layer, middle layer and bottom layer of the fabric in turn by differential roller pressing and partitioned immersion method, to form functional zones with spatial distribution difference;

[0009] S3. Place the fabric after partitioned finishing in a low-temperature plasma environment for treatment, so that the active groups in the finishing liquid and the polyester molecular chain segments have directional intercalation reaction, to enhance the binding firmness of the functional components;

[0010] S4. Perform hot air setting and slow cooling on the fabric after intercalation, to solidify the multi-layer functional coating structure and form a stable composite layer;

[0011] S5. Adopt softener micro-fog finishing process to adjust the fabric hand and control the surface friction coefficient, to obtain the final composite polyester fabric with softness, air permeability and multiple functions.

[0012] Preferably, the water-repellent finishing liquid contains fluorine-modified polyurethane microemulsion with a mass concentration of 0.5% to 2.0%, and an organic silicon crosslinking agent is added to improve the washing resistance;

[0013] The organic silicon crosslinking agent is γ-aminopropyl triethoxysilane, and the mass ratio of the organic silicon crosslinking agent to the fluorine-modified polyurethane microemulsion is 1:20 to 1:50, to form a three-dimensional network structure through covalent crosslinking to improve the washing resistance.

[0014] Preferably, the antibacterial finishing liquid is compounded by a quaternary ammonium salt type antibacterial agent and a chitosan derivative, with a mass ratio of 1:2, to achieve broad-spectrum antibacterial and washing resistance synergy;

[0015] The quaternary ammonium salt type antibacterial agent is dodecyl dimethyl benzyl ammonium chloride, and the chitosan derivative is carboxymethyl chitosan sodium, and the two form a washing-resistant antibacterial complex through charge adsorption and molecular entanglement.

[0016] Preferably, the anti-ultraviolet finishing liquid contains a hydroxybenzotriazole type ultraviolet absorber with a mass concentration of 0.3% to 1.0%, and a cationic dispersant (hexadecyl trimethyl ammonium bromide) is added to promote its uniform distribution on the fiber surface;

[0017] The mass ratio of the dispersant to the ultraviolet absorber is 1:5 to 1:10, to inhibit the ultraviolet absorber from agglomerating through electrostatic interaction.

[0018] Preferably, the plasma treatment adopts a radio frequency power source, the treatment gas is a mixture of oxygen and nitrogen with a volume ratio of 1:1, the total flow rate is 50 to 100 sccm, and the treatment time is 15 to 60 seconds;

[0019] The active groups (hydroxyl, amino) in the finishing liquid are initiated by plasma to open ring and graft with the ester groups of the polyester molecular chain, further improving the wash resistance of each functional layer.

[0020] Preferably, the hot air setting temperature is controlled at 140-170℃, the setting time is 90-180 seconds, the gradual cooling adopts stepwise cooling mode (140℃→120℃→100℃→room temperature), and each step of cooling is maintained for 30-60 seconds, so that the fabric is solidified and formed in a low stress state, and the wash resistance is avoided from being affected by the internal stress cracking of the functional layer.

[0021] Preferably, the softness regulation process adopts gas phase micro-mist spraying of a softening agent containing silicon (amino-modified silicone emulsion, solid content 20%-30%) and combines cold rolling technology (pressure 5-10 MPa) to control the surface friction coefficient of the fabric within the range of 0.2-0.35.

[0022] The atomized particle size of the micro-mist spraying is 30-80 μm, and the softness and the integrity of the functional layer are balanced by accurately controlling the softening agent adhesion amount.

[0023] Preferably, the three-layer functional areas of the fabric correspond to a waterproof surface layer, an antibacterial middle layer and an ultraviolet-resistant bottom layer, and the gradient permeation of differential roller pressing realizes no obvious interface between the layers, and the original air permeability is maintained at not less than 90%.

[0024] After 50 times of washing, the waterproof grade is ≥4, the antibacterial rate is ≥90%, and the UPF value is ≥50+.

[0025] To realize the above-mentioned preparation method of the multi-layer composite functional polyester fabric, the application further provides a preparation system of a multi-layer composite functional polyester fabric, comprising:

[0026] A base treatment unit is used for low-tension washing and hot air drying treatment of the high-twist polyester woven fabric, removing impurities and adjusting the fiber state.

[0027] A multi-functional finishing unit comprises a differential roller pressing device and a plurality of independently configured partitioned immersion tanks, which are respectively used for sequentially acting the water-repellent finishing liquid, the antibacterial finishing liquid and the ultraviolet-resistant finishing liquid on the surface layer, the middle layer and the bottom layer of the fabric.

[0028] A plasma grafting unit adopts a radio frequency plasma device and a gas mixing system, and is used for exciting the grafting reaction between the active groups in the finishing liquid and the polyester molecular chain.

[0029] A hot air setting unit is used for hot air setting and stepwise gradual cooling of the grafted fabric to realize the solidification of the composite structure.

[0030] A softness regulation unit has a micro-mist spraying assembly and a cold rolling mechanism, and is used for adjusting the hand feeling of the fabric and controlling the surface friction coefficient.

[0031] The control module comprises a PLC controller, a sensor group and a man-machine interface, and is used for coordinating operation parameters of each unit and constructing a closed-loop control system of multi-layer functions of the fabric.

[0032] Preferably, the differential roller pressing device comprises two groups of guide rollers with different rotating speeds, and the rotating speed ratio is 1:1.2, so as to realize gradient penetration of the finishing liquid in the thickness direction of the fabric.

[0033] The plasma chimeric unit uses mixed gas of oxygen and nitrogen with a volume ratio of 1:1, the total flow is 50-100 sccm, and the processing time is 15-60 seconds.

[0034] The gas-phase micro-mist spraying equipment in the softness regulation unit controls the atomized particle size to be 30-80 mu m, and the cold rolling pressure is controlled to be 5-10 MPa.

[0035] The control module has a closed-loop feedback control algorithm based on temperature, flow rate and process timing, which is used for dynamically adjusting the plasma output power, the hot air setting temperature and the cold rolling pressure.

[0036] Compared with the prior art, the preparation method and system of the multi-layer composite functional polyester fabric have the following beneficial effects:

[0037] Firstly, the differential roller pressing and multi-groove partition impregnation method are used to apply the water-repellent finishing liquid, the antibacterial finishing liquid and the anti-ultraviolet finishing liquid to the surface layer, the middle layer and the bottom layer of the fabric respectively, so that the functional finishing is spatially divided in the thickness direction, and the problem of mutual interference of multi-functional agents is effectively avoided.

[0038] Secondly, the plasma chimeric processing link is introduced, on the basis of not damaging the physical structure of the fabric, the ring-opening chemical reaction between the active groups in the finishing liquid and the polyester molecular chain segments is excited, and a strong bonding interface is formed.

[0039] Thirdly, the multi-temperature-zone hot air setting device and the step-by-step temperature reduction control system are arranged, so that the finished fabric is gradually solidified and formed in a low stress state, and the cracking, warping or peeling of the functional layer caused by sudden change of thermal stress is effectively avoided.

[0040] Fourthly, the softness control module is arranged at the end stage of fabric finishing, the silicon-containing softener is sprayed by micro-mist spraying, and the cold rolling control mode is combined to adjust the fabric surface friction coefficient and improve the hand feeling, so that the softness and wearing comfort of the fabric are improved without damaging the original functional layer. The overall process can balance the functional performance and physical touch, so that the obtained fabric is more suitable for actual scenes such as close-fitting wearing and high-frequency use. BRIEF DESCRIPTION OF DRAWINGS

[0041] Fig. 1 Preparation method flow chart of the multi-layer composite functional polyester fabric of the embodiment.

[0042] Fig. 2 Preparation system block diagram of the multi-layer composite functional polyester fabric of the embodiment. DETAILED DESCRIPTION

[0043] The preferred embodiment of the present application will be described in detail below with reference to the accompanying drawings.

[0044] Embodiment one

[0045] As shown in the figure, a preparation method of a multi-layer composite functional polyester fabric comprises the following steps: Figs. 1-2

[0046] S1. Select high-twist polyester woven fabric as the base fabric, and perform low-tension washing and hot air drying to remove surface floating oil impurities and adjust the fiber surface capillary effect;

[0047] S2. Prepare water-blocking finishing liquid, antibacterial finishing liquid and ultraviolet-resistant finishing liquid respectively, and sequentially pass through differential roller and partitioned immersion mode to make each finishing liquid act on the surface layer, middle layer and bottom layer of the fabric, respectively, to form functional zones with spatial distribution differences;

[0048] S3. Place the fabric after partitioned finishing in a low-temperature plasma environment for processing, so that the active groups in the finishing liquid and the polyester molecular chain segments occur directional intercalation reaction, and the combination firmness of the functional components is enhanced;

[0049] S4. Perform hot air setting and slow cooling on the intercalated fabric to solidify the multi-layer functional coating structure and form a stable composite layer;

[0050] S5. Adopt softener micro-mist finishing process to adjust the fabric hand feeling and control the surface friction coefficient, and obtain the final composite polyester fabric with softness, air permeability and multiple functions.

[0051] ​In use, the preparation method sequentially includes five steps of substrate washing, zoned finishing, plasma treatment, hot air setting and softness control. Among them, through low-tension washing and hot air drying, the residual oil and impurities on the surface of the fabric are removed, and the adhesion efficiency of the subsequent functional finishing liquid is improved; by adopting differential roller pressing and zoned immersion, the water-repellent, antibacterial and anti-ultraviolet functional finishing liquids are respectively applied to the surface, middle and bottom layers of the fabric to form functional zones with spatial distribution differences; then the low-temperature plasma treatment means is introduced to induce the intercalation reaction between active groups and polyester molecular chains; the hot air setting and slow cooling process further solidifies the structure of each functional layer under low stress conditions to ensure the stability between layers; finally, the surface friction coefficient is controlled through softener micro-fog finishing and cold rolling to optimize the fabric hand;

[0052] This method realizes the synergy of three functions of polyester fabric on the basis of ensuring softness and air permeability through multi-layer zoned finishing and step-by-step control; the functional components are layered and intercalated in the spatial structure, significantly improving the durability of water-repellent, antibacterial and anti-ultraviolet properties; the overall method takes into account the structural integrity, functional gradient distribution and fabric comfort, and is particularly suitable for the industrialized preparation of high-performance composite polyester fabrics.

[0053] As shown in Figs. 1-2 The water-repellent finishing liquid contains fluorine-modified polyurethane microemulsion with a mass concentration of 0.5% to 2.0%, and a silicone crosslinking agent is added to improve the wash resistance.

[0054] The silicone crosslinking agent is γ-aminopropyl triethoxysilane, and the mass ratio of γ-aminopropyl triethoxysilane to fluorine-modified polyurethane microemulsion is 1:20 to 1:50, which forms a three-dimensional network structure through covalent crosslinking to improve the wash fastness.

[0055] In use, the water-repellent finishing liquid uses fluorine-modified polyurethane microemulsion as the main component, which has a super-low surface energy due to the rich fluorocarbon chain segments in its molecular structure, and can form a dense hydrophobic barrier layer on the surface of the fabric. γ-aminopropyl triethoxysilane is introduced as a silicone crosslinking agent, which can undergo hydrolysis and condensation under the action of plasma or heat treatment, and further covalently crosslink with the hydroxyl groups in the polyurethane to form a stable three-dimensional network structure.

[0056] Through the above chemical crosslinking mechanism, not only the fixing ability of the finishing liquid on the fiber surface is improved, but also the wash resistance and water resistance of the fabric are significantly enhanced; the formed fluorine-silicon synergistic network structure is stable and not easy to peel off due to external influences such as washing and friction, significantly improving the durability and reliability of the protective function.

[0057] As shown in Figs. 1-2 The antibacterial finishing liquid is compounded with quaternary ammonium salt type antibacterial agent and chitosan derivative according to a mass ratio of 1:2 to achieve broad-spectrum antibacterial and wash-resistant synergy.

[0058] The quaternary ammonium salt type antibacterial agent is dodecyl dimethyl benzyl ammonium chloride, and the chitosan derivative is sodium carboxymethyl chitosan. The two form a washable antibacterial complex through charge adsorption and molecular entanglement.

[0059] In use, the antibacterial finishing liquid is configured by compounding the quaternary ammonium salt type antibacterial agent and the chitosan derivative. The quaternary ammonium salt type antibacterial agent has good cationic charge properties and can be adsorbed on the surface of the fiber with negative electricity. The sodium carboxymethyl chitosan as a natural polysaccharide derivative has a soft molecular chain and contains abundant hydrophilic groups, and can be molecularly entangled with the fiber structure. In the zoning finishing process, the antibacterial components formed by the two are stably combined in the middle layer of the fiber through electrostatic adsorption and entanglement.

[0060] The compounding scheme realizes the enhancement of the fixing property of the antibacterial agent and the expansion of the antibacterial spectrum, can effectively inhibit common bacteria such as Escherichia coli and Staphylococcus aureus, and at the same time improve the washability; the finishing liquid penetrates into the middle layer of the fabric, does not affect the water-blocking layer on the surface layer and the anti-ultraviolet layer on the bottom layer, guarantees the coexistence of multiple functions, and enhances the health safety and service life of the composite fabric.

[0061] As shown in Figs. 1-2 The anti-ultraviolet finishing liquid contains a hydroxybenzotriazole ultraviolet absorber, the mass concentration of which is 0.3% to 1.0%, and a cationic dispersant (hexadecyl trimethyl ammonium bromide) is added to promote the uniform distribution of the ultraviolet absorber on the fiber surface; the mass ratio of the dispersant to the ultraviolet absorber is 1:5 to 1:10, and the ultraviolet absorber is inhibited from agglomeration through electrostatic action.

[0062] In use, the anti-ultraviolet finishing liquid uses a hydroxybenzotriazole ultraviolet absorber, which has a stable π-π conjugated structure, can absorb ultraviolet rays in the UVA and UVB bands, and convert energy into heat energy through a non-radiation mode. Because this type of absorber has the problem of easy agglomeration, a cationic dispersant hexadecyl trimethyl ammonium bromide is introduced into the finishing liquid, which inhibits the aggregation of the absorber and promotes the uniform distribution of the absorber on the fiber surface through electrostatic action.

[0063] The finishing liquid forms a stable and dense ultraviolet absorption layer on the bottom layer of the fabric, which can effectively block the penetration of ultraviolet rays; due to the introduction of the dispersant, the ultraviolet absorber is more uniformly distributed, avoiding the reduction of absorption efficiency caused by local accumulation, further improving the UPF value and the use efficiency of the finishing liquid, and enhancing the sun protection function and durability of the fabric.

[0064] As shown in Figs. 1-2As shown, the plasma treatment adopts a radio frequency power source, and the treatment gas is a mixture of oxygen and nitrogen with a volume ratio of 1:1, a total flow rate of 50-100 sccm, and a treatment time of 15-60 seconds; through plasma-induced ring-opening intercalation reaction of active groups (hydroxyl, amino) in the finishing liquid and ester groups in the polyester molecular chain, the wash resistance of each functional layer is further improved.

[0065] In use, the plasma treatment adopts a radio frequency plasma source and an oxygen / nitrogen mixed gas, and a large number of high-energy particles and free radicals can be excited at low temperature. During the treatment process, the hydroxyl and amino groups rich in the finishing liquid are activated under the action of plasma, and further undergo ring-opening reaction with the ester groups on the polyester molecular chain to form stable chemical bonds, thereby realizing directional intercalation combination.

[0066] Compared with the traditional drying or hot pressing method, the plasma treatment greatly improves the binding firmness between the functional finishing agent and the fiber without damaging the mechanical properties of the fabric; through the intercalation reaction at the molecular level, the wash resistance and stability of the three-layer functional layer are improved, supporting the long-term durability of the finishing effect.

[0067] As shown in Figs. 1-2 , the hot air setting temperature is controlled at 140-170°C, the setting time is 90-180 seconds, and the slow cooling adopts a step-by-step cooling method (140°C→120°C→100°C→room temperature), each stage is kept for 30-60 seconds, so that the fabric is solidified and formed in a low stress state, avoiding the influence of the wash resistance due to the internal stress cracking of the functional layer.

[0068] In use, the fabric is heated to 140-170°C during the hot air setting process, which promotes the solidification of the microstructure between the finishing liquid and the fiber; then a slow cooling process is adopted, which slowly releases the internal stress of the fabric at each stage of the temperature gradient, especially suitable for multi-layer fabrics containing functional coating or composite structure.

[0069] This process avoids the problems of coating cracking and interlayer peeling caused by traditional rapid cooling process; realizes the stable solidification of the functional layer in a low stress state, improves the structural integrity, and effectively enhances the wash resistance and structural durability of the multi-functional composite layer.

[0070] As shown in Figs. 1-2 , the softness control process adopts gas-phase micro-mist spraying of a silicon-containing softener (amino-modified organosilicon emulsion with a solid content of 20%-30%) and combines with cold rolling technology (pressure 5-10 MPa) to control the fabric surface friction coefficient in the range of 0.2-0.35; the atomization particle size of the micro-mist spraying is 30-80 μm, and the softness and the integrity of the functional layer are balanced by precisely controlling the softener adhesion amount.

[0071] In use, the soft control adopts atomized spray to apply the softener containing silicon, the atomized particle size is controlled in 30-80 μm, to ensure that the softener is uniformly distributed on the fabric surface in the form of micro-droplets; then the cold rolling pressure is used to control the attachment amount and penetration depth, so that the softener adjusts the friction coefficient of the fabric without destroying the original functional layer structure.

[0072] The scheme takes into account the softness improvement and functional layer protection, avoids interference of soft treatment on water resistance, antibacterial and ultraviolet resistance effects; the friction coefficient is controlled in a reasonable range, to improve the wearing comfort and touch feeling, while maintaining the overall multifunctional stability of the fabric.

[0073] As shown in Figs. 1-2 The three-layer functional area of the fabric corresponds to the waterproof surface layer, the antibacterial middle layer and the ultraviolet resistant bottom layer, respectively, and the gradient penetration by differential roller pressure realizes no obvious interface between the layers, and the original air permeability is maintained at not less than 90% (measured according to GB / T 5453-1997); after 50 times of washing, the waterproof grade is ≥4 (GB / T 4744-2013), the antibacterial rate is ≥90% (GB / T 20944.3-2008), and the UPF value is ≥50+ (GB / T 18830-2009).

[0074] In use, the fabric is finished by three-layer partitioned functional finishing, the surface layer is a water resistance area, the middle layer is an antibacterial area, and the bottom layer is an ultraviolet resistant area. By means of gradient penetration by differential roller pressure, the finishing liquid is distributed step by step in the thickness direction, and there is no obvious interface between the layers but the functions do not interfere with each other. The setting of the functional layer does not significantly reduce the porosity of the original structure of the fabric.

[0075] The structure maintains the original air permeability, and gives the fabric excellent protective performance; after 50 times of washing by a standard method, the fabric still has high-level water resistance, antibacterial and ultraviolet resistance, which shows that the finishing method has high durability and is suitable for long-term use scenes such as outdoor and medical.

[0076] Example Two

[0077] As shown in Figs. 1-2 To realize the preparation method of the multi-layer composite functional polyester fabric in example one, the application further provides a preparation system of a multi-layer composite functional polyester fabric, which comprises: a base treatment unit for low-tension washing and hot air drying treatment of high-twist polyester woven fabric; to remove impurities and adjust the fiber state.

[0078] The base treatment unit comprises: a low-tension washing tank provided with a tension adjusting roller and a fabric guiding device, for conveying and cleaning the fabric under constant low tension; the washing water temperature is controlled at 40-60℃, and a surfactant is added to remove surface oil;

[0079] Hot air drying oven: closed structure, with three temperature control zones (80℃, 100℃, 120℃) and equipped with infrared temperature control sensor to realize multi-stage hot air constant temperature drying.

[0080] Multifunctional finishing unit for water-repellent finishing liquid, antibacterial finishing liquid and ultraviolet-resistant finishing liquid to act on the surface layer, middle layer and bottom layer of the fabric in turn, forming a three-function structure with obvious spatial distribution difference.

[0081] The multifunctional finishing unit comprises three independently configured functional finishing impregnation tanks corresponding to water-repellent, antibacterial and ultraviolet-resistant treatment processes respectively.

[0082] Differential roller pressing device composed of two groups of master-slave guide rollers with a speed ratio of 1:1.2, which can control the gradient penetration of finishing liquid in the thickness direction of the fabric and improve the precision of layering function.

[0083] Tensioning roller and cold pressing roller assembly for realizing preliminary shaping of finishing liquid and balance of fabric tension.

[0084] Plasma grafting unit for initiating grafting reaction between active groups in finishing liquid and polyester molecular chains under low temperature conditions to enhance the bonding strength.

[0085] The plasma grafting unit comprises a radio frequency plasma treatment cavity provided with an electrode plate and connected to a radio frequency power source.

[0086] Gas mixing system and vacuum pump system, the working gas is oxygen and nitrogen with a volume ratio of 1:1, the total flow is controlled at 50-100sccm, and the treatment time is 15-60 seconds.

[0087] Hot air setting unit for hot air setting and step-by-step slow cooling of the grafted fabric to improve the structural stability.

[0088] The hot air setting unit comprises a closed hot air oven divided into four temperature zones with temperatures of 140℃, 120℃, 100℃ and room temperature respectively, and each zone is provided with an infrared temperature measurement and air speed adjustment module.

[0089] Adjustable conveying track with tension adjustment structure to prevent fabric from warping and stress deformation during high temperature or cooling process.

[0090] Softness control unit for adjusting the final hand feeling of the fabric and controlling the surface friction performance while maintaining the integrity of the functional layer structure.

[0091] The softness control unit comprises a gas phase micro-mist spraying device using ultrasonic nozzles with atomized particle size controlled at 30-80μm, and the nozzles are arranged in left-right staggered manner to ensure uniform coverage of softener on the fabric surface.

[0092] The cold rolling mechanism is composed of upper and lower compression rollers, and the roller pressure adjustment range is 5-10 MPa, which is used for controlling the penetration depth and adsorption amount of the softening agent.

[0093] The control module is used for coordinating the operation parameters of the units and the process flow, and realizing dynamic regulation and control of multi-layer functions.

[0094] The control module comprises a PLC controller, temperature / tension / speed sensors and a human-machine interface (HMI).

[0095] Multiple sets of process curves are preset, and fabric type matching parameters can be automatically called.

[0096] A closed-loop feedback control algorithm is used to dynamically adjust the plasma output power, hot air setting temperature and cold rolling pressure according to real-time data acquisition, so as to realize optimal control of the fabric surface friction coefficient, the functional layer adhesion rate and the setting morphology.

[0097] The above is only the preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A method for preparing a multi-layer composite functional polyester fabric, characterized in that, It comprises the following steps: S1. Select high twist polyester woven fabric as the base fabric, and wash it with low tension and hot air drying to remove surface oil impurities and adjust the fiber surface effect; S2. Prepare water-repellent finishing liquid, antibacterial finishing liquid and anti-ultraviolet finishing liquid respectively, and make each finishing liquid act on the surface layer, middle layer and bottom layer of the fabric in turn by differential roller pressing and partition impregnation method to form functional zones with spatial distribution difference; S3. Put the fabric after partition finishing into a low temperature plasma environment for treatment, so that the active groups in the finishing liquid and polyester molecular chain segments occur directional intercalation reaction to enhance the binding strength of functional components; S4. Heat setting and slow cooling of the intercalated fabric to solidify the multi-layer functional coating structure and form a stable composite layer; S5. Softening agent micro-fog finishing process is used to adjust the fabric hand and control the surface friction coefficient to obtain the final soft polyester fabric with multiple functions such as softness, air permeability and multiple functions.

2. The method for preparing a multi-layer composite functional polyester fabric according to claim 1, characterized in that: The water-repellent finishing liquid contains fluorine-modified polyurethane microemulsion with a mass concentration of 0.5% to 2.0%, and silicone crosslinking agent is added to improve the washing resistance; The silicone crosslinking agent is γ-aminopropyl triethoxysilane, and the mass ratio of γ-aminopropyl triethoxysilane to fluorine-modified polyurethane microemulsion is 1:20 to 1:50, which forms a three-dimensional network structure through covalent crosslinking to improve the washing resistance.

3. The method according to claim 1, wherein the method is characterized by: The antibacterial finishing liquid is compounded by quaternary ammonium salt type antibacterial agent and chitosan derivative with a mass ratio of 1:2 to achieve broad-spectrum antibacterial and washing resistance synergy; The quaternary ammonium salt type antibacterial agent is dodecyl dimethyl benzyl ammonium chloride, and the chitosan derivative is carboxymethyl chitosan sodium, and the two form a washing-resistant antibacterial complex through charge adsorption and molecular entanglement.

4. The method according to claim 1, wherein the method is characterized by: The anti-ultraviolet finishing liquid contains hydroxybenzotriazole ultraviolet absorber with a mass concentration of 0.3% to 1.0%, and cationic dispersant (hexadecyl trimethyl ammonium bromide) is added to promote its uniform distribution on the fiber surface; The mass ratio of the dispersant to the ultraviolet absorber is 1:5 to 1:10, which inhibits the agglomeration of the ultraviolet absorber through electrostatic interaction.

5. The method for preparing a multi-layer composite functional polyester fabric according to claim 1, characterized in that: The plasma treatment uses a radio frequency power source, the treatment gas is a mixture of oxygen and nitrogen with a volume ratio of 1:1, the total flow rate is 50 to 100 sccm, and the treatment time is 15 to 60 seconds; The plasma initiates the ring-opening intercalation reaction between the active groups (hydroxyl, amino) in the finishing liquid and the ester groups of the polyester molecular chain to further improve the washing resistance of each functional layer.

6. The method for preparing a multilayer composite functional polyester fabric according to claim 1, characterized in that: The heat setting temperature is controlled at 140 to 170℃, the setting time is 90 to 180 seconds, the slow cooling adopts stepwise cooling method (140℃→120℃→100℃→room temperature), and each step of cooling is maintained for 30 to 60 seconds, so that the fabric is solidified and formed in a low stress state to avoid the cracking of the functional layer due to internal stress affecting the washing resistance.

7. The method according to claim 1, wherein the method is characterized by: The softening regulation process uses gas phase micro-fog spraying of silicone-containing softener (amino-modified silicone emulsion with a solid content of 20% to 30%) and combines cold rolling technology (pressure 5 to 10 MPa) to control the surface friction coefficient of the fabric within the range of 0.2 to 0.

35. The atomized particle size of the micro-mist spraying is 30-80 μm, and the softness and the integrity of the functional layer are balanced by precisely controlling the attachment amount of the softener.

8. The method for preparing a multilayer composite functional polyester fabric according to claim 1, characterized in that: The three-layer functional area of the fabric corresponds to a waterproof surface layer, an antibacterial middle layer, and an anti-ultraviolet bottom layer, respectively, and the gradient penetration of differential roller pressing is used to realize no obvious interface between layers, and the original air permeability is maintained at not less than 90%; After 50 times of washing, the waterproof grade is ≥4, the antibacterial rate is ≥90%, and the UPF value is ≥50+.

9. A system for preparing a multi-layer composite functional polyester fabric for implementing the method according to any one of claims 1-8, characterized in that, It comprises: a base treatment unit for low-tension washing and hot air drying treatment of high-twist polyester woven fabric, removing impurities and adjusting the fiber state; a multi-functional finishing unit including a differential roller pressing device and multiple independently configured partitioned impregnation tanks, respectively used for sequentially acting water-repellent finishing liquid, antibacterial finishing liquid, and anti-ultraviolet finishing liquid on the surface layer, middle layer, and bottom layer of the fabric; a plasma grafting unit using a radio frequency plasma device and a gas mixing system for exciting the grafting reaction between active groups in the finishing liquid and polyester molecular chains; a hot air setting unit for hot air setting and step-by-step slow cooling of the grafted fabric to realize curing of the composite structure; a softness control unit with a micro-mist spraying assembly and a cold rolling mechanism for adjusting the hand feeling of the fabric and controlling the surface friction coefficient; a control module including a PLC controller, a sensor group, and a human-machine interface for coordinating the operating parameters of each unit to build a closed-loop control system for the multi-layer function of the fabric.

10. The multi-layer composite functional polyester fabric preparation system according to claim 9, wherein, The differential roller pressing device includes two groups of guide rollers with different rotating speeds, and the rotating speed ratio is 1:1.2, which is used to realize the gradient penetration of the finishing liquid in the thickness direction of the fabric; The plasma grafting unit uses mixed gas of oxygen and nitrogen with a volume ratio of 1:1, the total flow rate is 50-100 sccm, and the processing time is 15-60 seconds; The atomized particle size of the gas-phase micro-mist spraying equipment in the softness control unit is controlled to be 30-80 μm, and the cold rolling pressure is controlled to be 5-10 MPa; The control module has a closed-loop feedback control algorithm based on temperature, flow rate, and process timing for dynamically adjusting the plasma output power, hot air setting temperature, and cold rolling pressure.

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