Preparation process of soft and smooth fine denier cotton-like anti-ultraviolet sunscreen functional fabric

Abstract

This invention discloses a process for preparing a soft, skin-friendly, fine-denier cotton-like functional fabric with UV protection. It simplifies pretreatment and transfer processes, eliminating the need for steam and refrigeration energy. Direct heating via furnace tubes saves electricity and extends equipment lifespan. Nitrogen micro-positive pressure heating during material feeding prevents material self-agglomeration, significantly extending equipment maintenance cycles. This process uses variable frequency drive and continuous pipeline proportioning pre-reaction instead of traditional batch feeding, improving reaction efficiency and tank maintenance lifespan. Combined with gas-phase filling, it reduces material waste. The prepared fabric is soft, skin-friendly, washable, and has a UPF≥50, making it suitable for high-end fabric applications such as outdoor and children's wear.

Description

Technical Field

[0001] This invention relates to the field of functional textile fabric preparation technology, specifically to the preparation process of soft, skin-friendly, fine-denier cotton-like anti-ultraviolet sun-protective functional fabric. Background Technology

[0002] Fine-denier cotton-like fabrics, with their soft texture, good breathability, and feel close to pure cotton, are widely used in outdoor apparel, children's wear, and home furnishings. However, existing cotton-like fabric manufacturing processes suffer from several common industry-wide defects: First, the fabric modification and functional finishing processes are cumbersome, with high energy consumption in pretreatment, finishing, and curing processes. Redundant hot and cold alternating processes result in significant energy loss and high production costs. Second, the heating methods for fabric forming and functional curing are often unreasonable, employing mostly indirect heating modes, leading to low heat utilization, high electricity consumption, uneven heating, localized fiber aging, and shortened fabric lifespan and equipment service life. Third, during the fabric functional modification process, trace amounts of oxygen and impurities can easily enter the system, causing fiber micro-agglomeration and functional additive self-agglomeration. The formation of sediments leads to uneven UV resistance and a deterioration in the skin-friendly and soft feel of the fabric. Production equipment requires frequent maintenance and repair, resulting in poor production continuity. Fourth, unreasonable filling and setting processes after functional modification of the finished fabric can easily lead to the loss of functional components and substandard setting effects, resulting in material waste and a low yield rate. Fifth, traditional fabric modification reactions use a batch feeding and manual assisted feeding mode, resulting in low precision in the ratio of additives to matrix fibers, uncontrollable reaction rates, high load on reaction tanks, and a large amount of residual material. This not only causes rapid equipment wear but also significantly reduces the efficiency of fabric modification reactions and the stability of finished product performance.

[0003] Meanwhile, existing UV-protective fabrics mostly employ a single finishing coating process, where sunscreen agents only adhere to the fabric surface. This results in poor washability, with the UPF sun protection index significantly decreasing after multiple washes. Furthermore, these fabrics generally suffer from a stiff feel, insufficient fineness, and poor skin-friendliness, failing to meet the demands of high-end outdoor flexible fabrics. Based on these industry pain points and combining industrial optimization strategies for energy conservation, equipment lifespan extension, and quality and efficiency improvement, this manufacturing process has been developed. Summary of the Invention

[0004] This invention aims to overcome the shortcomings of existing technologies and provide a process for preparing a soft, skin-friendly, fine-denier cotton-like functional fabric with UV protection. By simplifying the production process, optimizing the heating mode, improving the system atmosphere, optimizing the finished product processing method, and adopting a continuous pipeline mixing and reaction process, it achieves energy saving and consumption reduction, equipment life extension, elimination of material self-agglomeration waste, and improvement of the fabric's soft, skin-friendly feel and long-lasting UV protection performance. The process is suitable for industrial continuous production, has strong stability, and is cost-controllable.

[0005] To solve the above-mentioned technical problems, the technical solution provided by this invention is: a preparation process for a soft, skin-friendly, fine-denier cotton-like anti-ultraviolet sun-protective functional fabric, comprising the following steps:

[0006] Step S1: Pretreatment of fine denier cotton-like base fabric: Select 0.8-1.2D fine denier polyester cotton-like fiber to weave a greige fabric with a weight of 80-120 g / m². Directly and quantitatively deliver the pretreatment liquid through a flow meter, omitting the intermediate processes of condensation storage tank, metering tank, and steam pressurization transfer. Perform a one-dip and one-puff degreasing and pre-wetting treatment on the greige fabric with a puffing rate of 65-75%, a pretreatment liquid temperature of 45-55℃, and a treatment time of 30-40 seconds.

[0007] Step S2, Direct heating and drying: The pretreated wet fabric is sent into a radiant drying and shaping oven. The indirect heating structure of the sleeve is eliminated, and direct radiant heating of the furnace tube is adopted. The heating temperature is 110-120℃ and the speed is 15-20m / min to complete the drying and shaping of the fabric.

[0008] Step S3, Nitrogen micro-positive pressure anti-self-polymerization modification: The shaped base fabric is sent into a closed modification reaction furnace, nitrogen is introduced to maintain a micro-positive pressure of 0.02-0.05MPa in the furnace, the oxygen content in the furnace is controlled to be ≤0.3%, and after the temperature is raised to 130-140℃ under the micro-positive pressure atmosphere, the compounded anti-ultraviolet modification additive is added.

[0009] Step S4, Continuous and precise proportioning modification reaction in pipelines: A variable frequency pump is used to quantitatively deliver liquid modifying agents. A powder storage tank and a closed conveying pipeline are used to achieve synchronous feeding of solid and liquid materials in proportion. After pre-reaction in a standardized closed pipeline, the materials enter the reaction tank at a uniform speed for deep modification. The reaction waste gas is sent to a water washing tower and an alkali washing tower for purification before being discharged into the air. The diameter of the closed pipeline is 80-120mm, the effective reaction length is 8-12m, and the pipeline slope is 3-5°.

[0010] Step S5, Functional Curing and Softening Finishing: After modification, cure at a constant temperature of 145-155℃ for 60-90s, then use a water-based softening finishing agent for two dips and two nips, with a nips ratio of 70-80%, and dry at a low temperature of 100-110℃.

[0011] Step S6, Gas-phase connection finished product filling: Use gas phase pipeline to connect to the finished product filling equipment to complete the sealed filling of the fabric finished product;

[0012] Step S7, Cooling and Rewinding Inspection: The fabric is cooled to room temperature, rolled flat, and then put into storage after passing the inspection.

[0013] Furthermore, in step S1, the pretreatment liquid is composed of 0.8-1.2 wt% fatty alcohol polyoxyethylene ether degreasing agent and the remainder soft water. There is no material transfer throughout the process, saving energy consumption of steam and refrigeration brine.

[0014] Furthermore, in step S3, the compounded UV-resistant modifier is composed of nano-modified titanium dioxide, organic benzotriazole UV absorber, and silane coupling agent in a mass ratio of 3:1.2:0.5, with an average particle size of 30-50 nm.

[0015] Furthermore, in step S4, the flow rate fluctuation of the variable frequency pump is ≤±2%, the solid-liquid material ratio accuracy is controlled within ±1%, the manual elevator batch feeding mode is abandoned, and continuous automated ratio reaction is realized.

[0016] Furthermore, in step S3, the nitrogen micro-positive pressure protection system can prevent the self-aggregation and precipitation of additives and fiber materials under high-temperature conditions, extending the equipment maintenance cycle from once a year to once every 4 to 5 years.

[0017] Furthermore, in step S2, the direct radiation heating mode of the furnace tube improves the heat utilization rate by more than 20% compared with the traditional indirect heating mode of the sleeve, effectively reducing power consumption and extending the service life of the furnace equipment.

[0018] Furthermore, in step S6, the gas phase pipeline docking filling mode can completely avoid the problems of loss of fabric functional components, unqualified filling, and material venting waste caused by traditional liquid phase docking, thereby improving the yield of finished products.

[0019] Furthermore, in step S4, the combined process of pipeline pre-reaction and deep reaction in the reaction tank can improve the fabric modification reaction efficiency by more than 25%, while reducing material residue and corrosion loss in the reaction tank and extending the service life of the reaction tank.

[0020] Furthermore, the prepared finished fabric has a UPF sun protection index of ≥50, a UVA transmittance of ≤5%, and maintains excellent UV protection performance after 50 standard washes. The fabric is soft, skin-friendly, delicate, and without any stiffness.

[0021] With the above structure, the present invention has the following advantages: 1. The present invention simplifies the redundant transfer process of traditional fabric pretreatment, eliminates the intermediate links of condensation storage tank, metering tank and steam pressurization transfer, and directly supplies materials quantitatively by flow meter, which greatly saves the energy consumption of steam and refrigeration brine required for production, reduces the cost of industrial production, and makes the production process simpler and more efficient.

[0022] 2. The furnace heating mode has been optimized, eliminating indirect heating through the sleeve and adopting direct radiant heating through the furnace tube. This significantly improves heat utilization and saves electricity. At the same time, it avoids equipment damage and fabric defects caused by aging of the sleeve and uneven temperature difference, effectively extending the overall service life of the heating equipment.

[0023] 3. The nitrogen micro-positive pressure heating and feeding process completely solves the industry problems of excessive oxygen content and self-aggregation of additives and fiber materials in the traditional negative pressure heating system. It eliminates the problems of precipitation of functional components and uneven performance of fabrics. The equipment maintenance cycle is extended from once a year to once every 4 to 5 years, which greatly improves production continuity and reduces equipment maintenance costs.

[0024] 4. The innovative pipeline continuous and precise proportioning pre-reaction process replaces the traditional manual lifting and batch feeding mode. The material proportioning is accurate and the reaction is slow and controllable. This not only greatly improves the efficiency and uniformity of fabric modification reaction, but also significantly reduces corrosion and residual loss of the reaction tank and extends the service life of the equipment. At the same time, the exhaust gas is purified by water washing and alkali washing before being discharged into the air, which is green and environmentally friendly.

[0025] 5. The finished product filling adopts a gas phase pipeline docking process, which completely solves the problems of unqualified fabric components, material venting and waste, and poor filling caused by traditional liquid phase docking, thereby improving the yield of finished products and reducing material loss.

[0026] 6. The fabric prepared by this invention has both excellent soft and skin-friendly feel and long-lasting anti-ultraviolet sun protection performance. The fabric is fine, soft to the touch, and has no stiffness. The UPF sun protection index is ≥50 and the UVA transmittance is ≤5%. It can still maintain excellent sun protection performance after 50 washes. It is suitable for outdoor clothing, children's clothing, and high-end home furnishing fabrics. Detailed Implementation

[0027] The present invention will now be described in further detail.

[0028] A process for preparing a soft, skin-friendly, fine-denier cotton-like functional fabric with UV protection includes the following steps:

[0029] S1. Pretreatment of fine denier cotton-like base fabric: Select 0.8-1.2D fine denier polyester cotton-like fiber to weave the greige fabric with a weight of 80-120g / ㎡. Send the greige fabric into the continuous pretreatment production line, omitting the redundant processes of traditional condensation storage, transfer metering, and steam pressurization. Directly and quantitatively deliver the degreasing agent and soft water mixed pretreatment liquid through a precise flow meter to perform one dip and one swab degreasing and pre-wetting treatment on the greige fabric. The swab rate is controlled at 65-75%, the pretreatment liquid temperature is 45-55℃, and the treatment time is 30-40s. This simplifies transfer energy consumption and saves steam and refrigeration energy consumption.

[0030] The pretreatment solution is composed of 0.8-1.2 wt% fatty alcohol polyoxyethylene ether degreasing agent and the remainder soft water. It is fed quantitatively by a precise flow meter, without the intermediate links of storage tanks and metering tanks. Compared with the traditional process, it saves 15-20% of steam energy consumption and 12-18% of cooling brine energy consumption.

[0031] S2. Low-energy direct heating drying and setting: The pre-treated wet fabric is directly fed into the radiation drying and setting furnace, eliminating the traditional indirect heating mode with sleeves. The furnace tube directly radiates heat the fabric at a temperature of 110-120℃ and a speed of 15-20m / min. A single drying and setting process can complete the drying of the fabric and the initial setting of the fibers, reducing heat loss and energy consumption. At the same time, it avoids the problems of uneven temperature difference and aging and wear of equipment sleeves caused by indirect heating, and extends the service life of the furnace equipment.

[0032] S3. Nitrogen micro-positive pressure anti-self-polymerization function modification: The dried and shaped base fabric is sent into a closed modification reaction furnace. The traditional negative pressure heating process is abandoned. Nitrogen micro-positive pressure protection is used throughout the process. The furnace pressure is controlled at 0.02~0.05MPa and the oxygen content is ≤0.3%. After heating to 130~140℃, the material is fed at a constant temperature. Compound anti-UV modification additives are added to effectively prevent the self-polymerization, precipitation and deterioration of additives and fiber system under high temperature and oxygen environment.

[0033] The compounded UV-resistant modifier is composed of nano-modified titanium dioxide, organic benzotriazole UV absorber, and silane coupling agent in a mass ratio of 3:1.2:0.5. It has a particle size of 30-50nm, excellent dispersibility, and micro-positive pressure nitrogen protection can completely eliminate the problem of self-polymerization failure of the additive, and significantly extend the maintenance cycle of modification reaction equipment and recovery and purification equipment.

[0034] S4. Continuous and precise proportioning modification reaction via pipeline: This method abandons the traditional batch-by-batch manual feeding mode in reaction tanks and the auxiliary feeding mode of elevators. It uses a variable frequency pump to quantitatively deliver liquid modifying agents, and is equipped with a powder storage tank and a closed conveying pipeline to achieve simultaneous proportioning of solid and liquid materials. The solid-liquid reaction ratio is preset according to the fabric modification requirements. After pre-mixing and pre-reacting in the closed conveying pipeline, the materials enter the reaction tank at a uniform speed for deep modification reaction. The pipeline is designed according to engineering standards, with reasonable pipe diameter, slope, and reaction length reserved to ensure uniform material mixing and a smooth and controllable reaction. Trace amounts of water vapor and organic waste gas generated during the reaction are sent to a water washing tower and an alkali washing tower for purification before being discharged into the atmosphere.

[0035] The frequency of the variable frequency pump is adjusted in real time according to the production capacity, and the flow rate fluctuation of liquid additives is ≤±2%. The powder storage tank is equipped with a spiral uniform feeding mechanism, and the solid-liquid material ratio is controlled within ±1%. The closed reaction pipeline adopts a standardized engineering design with a pipe diameter of 80-120mm, an effective reaction length of 8-12m, and a slope of 3-5°, ensuring continuous and stable material reaction with no residue or agglomeration. This effectively reduces the load on the reaction tank, extends the service life of the reaction tank by more than 3 times, and improves the modification reaction efficiency by more than 25%.

[0036] S5. Functional curing and softening finishing: After the modification reaction is completed, the fabric is sent into a curing oven and cured at a constant temperature of 145-155℃ for 60-90 seconds to covalently combine the UV-resistant additives with the fiber molecules. Then, a water-based softening finishing agent is used for padding, with two dips and two pads, a padding rate of 70-80%, and low-temperature drying at 100-110℃ to give the fabric a soft and skin-friendly property.

[0037] S6. Gas-phase in-line shaping and filling: After the fabric is finished, the finished product is shaped, rolled and stored. The finished product functional testing and filling process abandons the traditional liquid phase pipeline in-line mode and adopts gas phase pipeline in-line filling to avoid the problems of loss of fabric functional components, unqualified filling and material waste, and achieves stable filling of finished fabric and uniform component compliance.

[0038] S7. Cooling, winding, and finished product inspection: After the finishing and curing process, the fabric is cooled naturally at room temperature, rolled up flat, and the fabric weight, hand feel, UPF sun protection index, and breathability and skin-friendly performance are tested. After passing the test, the fabric is put into storage.

[0039] In a specific implementation of the present invention, Example 1

[0040] This embodiment provides a process for preparing a soft, skin-friendly, fine-denier cotton-like functional fabric with UV protection and sun protection. The specific steps are as follows:

[0041] S1. Pretreatment of fine denier cotton-like base fabric: Select 1.0D fine denier polyester cotton-like fiber to weave greige fabric with a weight of 100g / ㎡. Send the greige fabric into the continuous pretreatment production line, eliminating the traditional condensation storage, transfer metering, and steam pressurization conveying processes. The pretreatment liquid is quantitatively conveyed through a high-precision electromagnetic flowmeter. The pretreatment liquid is compounded with 1.0wt% fatty alcohol polyoxyethylene ether degreasing agent and the remainder soft water at a temperature of 50℃. The greige fabric is pre-wetted by one dip and one swab, with a swab rate of 70% and a treatment time of 35s. This directly completes the degreasing, impurity removal, and fiber pre-activation of the greige fabric, without material transfer energy consumption loss.

[0042] S2. Direct heating drying and setting: The pre-treated wet fabric is directly fed into the radiation drying and setting furnace, eliminating the indirect heating structure of the sleeve and adopting direct radiation heating of the furnace tube. The heating temperature is 115℃ and the production line speed is 18m / min. The moisture drying and preliminary fiber setting of the fabric are completed in one go. The heat utilization rate is 22% higher than the traditional process, and the power saving per unit product is 18%. There is no aging and wear of the sleeve in the furnace equipment, and the stability of continuous operation of the equipment is greatly improved.

[0043] S3. Nitrogen micro-positive pressure anti-self-polymerization modification and heating: The shaped base fabric is sent into a closed modification reactor. First, high-purity nitrogen is introduced to replace the air in the furnace, and the micro-positive pressure in the furnace is controlled at 0.03MPa. The oxygen content in the furnace is kept stable at ≤0.25%. Under the nitrogen micro-positive pressure atmosphere, the temperature is uniformly raised to 135℃. After the temperature is stabilized, a compounded anti-ultraviolet modification agent is added. The agent is composed of nano-modified titanium dioxide, organic benzotriazole ultraviolet absorber, and silane coupling agent in a mass ratio of 3:1.2:0.5, with an average particle size of 40nm. This effectively prevents the self-polymerization and precipitation of the agent under high temperature and oxygen environment.

[0044] S4. Continuous and Precise Proportioning Modification Reaction: A variable frequency metering pump is used to deliver the liquid additive solution. The pump frequency is stable at 35Hz, and the flow rate fluctuation is ≤±2%. A sealed powder storage tank and a screw feeding mechanism are used to deliver the powder additive. The solid-liquid mass ratio is preset to 1:4.5 according to the fabric modification requirements. The material enters a standardized sealed reaction pipeline with a pipe diameter of 100mm, an effective reaction length of 10m, and a pipe slope of 4°. After the material is fully mixed and pre-reacted in the pipeline, it enters the reaction tank at a uniform speed for deep modification. The reaction temperature is 135℃ and the reaction time is 8min. The trace amount of waste gas generated during the reaction process is sent to a water washing tower and an alkali washing tower for step-by-step purification before being discharged into the atmosphere. This process eliminates the error of manual feeding, greatly improves the uniformity of the reaction, prevents local material accumulation and corrosion in the reaction tank, significantly extends the service life of the equipment, and improves the reaction efficiency by 28%.

[0045] S5. Functional Curing and Softening Finishing: After modification, the fabric is sent to a curing oven at 150℃ for 75 seconds to ensure stable bonding between the UV-resistant additives and the fibers. Subsequently, a water-based polyurethane softening agent is used for two dips and two nips, with a nips ratio of 75%, and the fabric is dried at a low temperature of 105℃ to eliminate the stiffness of the fabric during processing and improve its softness and skin-friendliness.

[0046] S6. Gas-phase connection for finished product filling: After the fabric is finished and shaped, a gas phase pipeline is used to connect to the finished product roll filling equipment. The entire process is a closed gas phase transport, which avoids the loss of functional components on the fabric surface and the problem of uneven local components. The finished product filling qualification rate is 100%, and there is no waste of material venting.

[0047] S7. Cooling and winding inspection: The fabric is naturally cooled at room temperature and wound flat. Finished product inspection: The fabric has a soft and delicate touch, without stiff particles, UPF index of 52, UVA transmittance of 4.2%, and the UPF index can still reach 48 after 50 washes. The fabric has an air permeability of 320mm / s and excellent skin-friendliness and sun protection performance. Example 2

[0048] This embodiment provides a process for preparing a soft, skin-friendly, fine-denier cotton-like functional fabric with UV protection and sun protection. The specific steps are as follows:

[0049] S1. Pretreatment of fine denier cotton-like base fabric: 0.8D fine denier polyester cotton-like fiber is selected to weave the greige fabric with a weight of 85g / ㎡. The direct quantitative feeding mode of the flow meter is adopted to eliminate all intermediate material storage, metering and steam pressurization processes. The pretreatment liquid consists of 0.8wt% degreasing agent and the remainder soft water. The temperature is 45℃. It is treated with one dip and one nip, with a nip rate of 65% and a treatment time of 30s. The degreasing and pre-activation of the greige fabric is completed quickly, saving more than 16% of steam and refrigeration energy consumption.

[0050] S2. Direct heating and drying: The wet fabric is directly heated and shaped in the radiant furnace tube without the need for indirect heating. The heating temperature is 110℃ and the speed is 15m / min. The drying and shaping are completed in one go, which greatly reduces the heat loss of the equipment. There is no failure due to aging of the sleeve during continuous operation, and the equipment maintenance cycle is significantly extended.

[0051] S3. Nitrogen micro-positive pressure anti-self-agglomeration modification: Nitrogen gas is introduced into the modification furnace to maintain a micro-positive pressure of 0.02MPa, and the oxygen content in the furnace is ≤0.3%. The temperature is raised to 130℃ under the micro-positive pressure atmosphere and the material is fed at a constant temperature. The same compound anti-UV additive with the same ratio as in Example 1 is used to completely eliminate the problems of additive self-agglomeration and fiber agglomeration. There is no material accumulation or deteriorated material residue in the equipment.

[0052] S4. Continuous and precise proportioning reaction in pipelines: Adjust the frequency of the variable frequency pump to 30Hz to precisely control the flow rate of liquid additives, feed the powder storage tank at a uniform speed, with a solid-liquid ratio of 1:4, and use a closed reaction pipeline with a diameter of 80mm, an effective length of 8m, and a slope of 3°. After the material pipeline is pre-reacted, it enters the reaction tank for deep reaction. The reaction temperature is 130℃ and the reaction time is 7min. The exhaust gas is purified by water washing and alkali washing before being discharged. The reaction tank is evenly loaded, with no residual corrosion, and the reaction efficiency is improved by 25%.

[0053] S5. Functional curing and softening finishing: Cured at 145℃ for 60 seconds, using a softening agent for two dips and two nips, with a 70% nipping rate, and dried at 100℃. The fabric has a soft and delicate feel, similar to the skin-friendly texture of pure cotton.

[0054] S6. Vapor phase filling molding: Vapor phase pipeline is used to connect to the finished product filling, with no component loss or material waste throughout the process, and the finished product has uniform and stable composition.

[0055] S7. Cooling, inspection, and winding: The finished fabric has a UPF index of 50 and a UVA transmittance of 4.5%. After 50 washes, the UPF index is 46. The fabric is lightweight, soft, skin-friendly, and non-irritating, making it suitable for children's clothing and close-fitting outdoor apparel. Example 3

[0056] This embodiment provides a process for preparing a soft, skin-friendly, fine-denier cotton-like functional fabric with UV protection and sun protection. The specific steps are as follows:

[0057] S1. Pretreatment of fine denier cotton-like base fabric: Select 1.2D fine denier polyester cotton-like fiber to weave the greige fabric with a weight of 120g / ㎡. The flow meter directly and quantitatively delivers 1.2wt% degreasing agent pretreatment liquid at a temperature of 55℃. The process involves one dip and one nip, with a nip rate of 75% and a treatment time of 40s. This simplifies the intermediate transfer process and significantly reduces energy consumption.

[0058] S2. Direct heating drying and shaping: The furnace tube directly radiates heat at a temperature of 120℃ and a speed of 20m / min, which can quickly dry and shape the product. This results in significant energy savings, as the equipment has no indirect heating losses and its service life is greatly extended.

[0059] S3, Nitrogen micro-positive pressure modification: The nitrogen in the furnace is at a micro-positive pressure of 0.05MPa, the oxygen content is ≤0.2%, and the material is fed at a constant temperature of 140℃, which completely eliminates the problem of self-polymerization in the system. The equipment can operate continuously and stably for more than 4 years without major repairs.

[0060] S4. Precise pipeline reaction: The variable frequency pump provides stable material supply at 40Hz, with a solid-liquid ratio of 1:5. The pipeline has a diameter of 120mm, a length of 12m, and a slope of 5°. The material undergoes continuous pre-reaction followed by deep modification. The reaction temperature is 140℃ and the time is 9min. The reaction is uniform and efficient, and the loss of the reaction tank is extremely low.

[0061] S5-S7, Curing and Finishing, Vapor Phase Filling, Cooling and Inspection: Curing at 155℃ for 90 seconds, softening and finishing followed by low-temperature drying, vapor phase filling with no waste, finished product UPF index 53, UVA transmittance 3.8%, excellent washability, skin-friendliness, and sun protection performance, suitable for use with high-end outdoor fabrics.

[0062] The present invention and its embodiments have been described above. This description is not restrictive, and the actual structure is not limited thereto. In conclusion, if those skilled in the art, inspired by this description, design similar structures and embodiments without departing from the spirit of the invention, such designs should fall within the scope of protection of this invention.

Claims

1. A preparation process of a soft, fine denier, skin-friendly, cotton-like, anti-UV, sunscreen functional fabric, characterized in that, Includes the following steps: Step S1: Pretreatment of fine denier cotton-like base fabric: Select 0.8-1.2D fine denier polyester cotton-like fiber to weave a greige fabric with a weight of 80-120 g / m². Directly and quantitatively deliver the pretreatment liquid through a flow meter, omitting the intermediate processes of condensation storage tank, metering tank, and steam pressurization transfer. Perform a one-dip and one-puff degreasing and pre-wetting treatment on the greige fabric with a puffing rate of 65-75%, a pretreatment liquid temperature of 45-55℃, and a treatment time of 30-40 seconds. Step S2, Direct heating and drying: The pretreated wet fabric is sent into a radiant drying and shaping oven. The indirect heating structure of the sleeve is eliminated, and direct radiant heating of the furnace tube is adopted. The heating temperature is 110-120℃ and the speed is 15-20m / min to complete the drying and shaping of the fabric. Step S3, Nitrogen micro-positive pressure anti-self-polymerization modification: The shaped base fabric is sent into a closed modification reaction furnace, nitrogen is introduced to maintain a micro-positive pressure of 0.02-0.05MPa in the furnace, the oxygen content in the furnace is controlled to be ≤0.3%, and after the temperature is raised to 130-140℃ under the micro-positive pressure atmosphere, the compounded anti-ultraviolet modification additive is added. Step S4, Continuous and precise proportioning modification reaction in pipelines: A variable frequency pump is used to quantitatively deliver liquid modifying agents. A powder storage tank and a closed conveying pipeline are used to achieve synchronous feeding of solid and liquid materials in proportion. After pre-reaction in a standardized closed pipeline, the materials enter the reaction tank at a uniform speed for deep modification. The reaction waste gas is sent to a water washing tower and an alkali washing tower for purification before being discharged into the air. The diameter of the closed pipeline is 80-120mm, the effective reaction length is 8-12m, and the pipeline slope is 3-5°. Step S5, Functional Curing and Softening Finishing: After modification, cure at a constant temperature of 145-155℃ for 60-90s, then use a water-based softening finishing agent for two dips and two nips, with a nips ratio of 70-80%, and dry at a low temperature of 100-110℃. Step S6, Gas-phase connection finished product filling: Use gas phase pipeline to connect to the finished product filling equipment to complete the sealed filling of the fabric finished product; Step S7, Cooling and Rewinding Inspection: The fabric is cooled to room temperature, rolled flat, and then put into storage after passing the inspection.

2. The process for preparing the soft, fine denier, skin-friendly, UV-protective, sun-protective functional fabric of the soft, fine denier, skin-friendly, UV-protective, sun-protective fabric according to claim 1, characterized in that: In step S1, the pretreatment solution is composed of 0.8-1.2 wt% fatty alcohol polyoxyethylene ether degreasing agent and the remainder soft water. There is no material transfer throughout the process, saving energy consumption of steam and refrigeration brine.

3. The preparation process of the soft, skin-friendly, fine-denier cotton-like anti-UV sun protection functional fabric according to claim 1, characterized in that: In step S3, the compounded UV-resistant modifier is composed of nano-modified titanium dioxide, organic benzotriazole UV absorber, and silane coupling agent in a mass ratio of 3:1.2:0.5, with an average particle size of 30-50 nm.

4. The preparation process of the soft, skin-friendly, fine-denier cotton-like anti-UV sun protection functional fabric according to claim 1, characterized in that: In step S4, the flow rate fluctuation of the variable frequency pump is ≤±2%, the solid-liquid material ratio accuracy is controlled within ±1%, the manual elevator batch feeding mode is abandoned, and continuous automated ratio reaction is realized.

5. The preparation process of the soft, skin-friendly, fine-denier cotton-like anti-UV sun protection functional fabric according to claim 1, characterized in that: In step S3, the nitrogen micro-positive pressure protection system can prevent the self-aggregation and precipitation of additives and fiber materials under high temperature conditions, extending the equipment maintenance cycle from once a year to once every 4 to 5 years.

6. The preparation process of the soft, skin-friendly, fine-denier cotton-like anti-ultraviolet sun-protective functional fabric according to claim 1, characterized in that: In step S2, the direct radiation heating mode of the furnace tube improves the heat utilization rate by more than 20% compared with the traditional indirect heating mode of the sleeve tube, effectively reduces power consumption, and extends the service life of the furnace equipment.

7. The preparation process of the soft, skin-friendly, fine-denier cotton-like anti-UV sun protection functional fabric according to claim 1, characterized in that: In step S6, the gas phase pipeline docking filling mode can completely avoid the problems of loss of fabric functional components, unqualified filling, and material waste caused by traditional liquid phase docking, thereby improving the yield of finished products.

8. The preparation process of the soft, skin-friendly, fine-denier cotton-like anti-ultraviolet sun-protective functional fabric according to claim 1, characterized in that: In step S4, the combined process of pipeline pre-reaction and deep reaction in the reaction tank can improve the fabric modification reaction efficiency by more than 25%, while reducing material residue and corrosion loss in the reaction tank and extending the service life of the reaction tank.

9. The preparation process of the soft, skin-friendly, fine-denier cotton-like anti-ultraviolet sun-protective functional fabric according to claim 1, characterized in that: The finished fabric has a UPF sun protection index of ≥50 and a UVA transmittance of ≤5%. It still maintains excellent UV protection performance after 50 standard washes. The fabric is soft, skin-friendly, delicate and without stiffness.