An anti-static protective workwear fabric and a method for making the same

Abstract

The present application relates to a kind of anti-static protective tooling fabric and its preparation method, the fabric includes base cloth layer, grid layer and coating, base cloth layer is by warp yarn and weft yarn with 2 / 1 twill weave interwoven, warp yarn and weft yarn are all fine denier high-strength polyester low-elastic network silk, grid layer is formed by electrically conductive yarn according to warp and weft interwoven on base cloth layer, electrically conductive yarn is by organic conductive fiber and fine denier high-strength polyester low-elastic network silk ply and twist, coating is coated on grid layer, fine denier high-strength polyester low-elastic network silk is surface treated by fluorocarbon structure lubricant;The present application is surface treated by fluorocarbon structure lubricant to high-strength fine denier polyester fiber in fabric, solves the technical bottleneck of "wick hygroscopic effect" in coating, significantly improves the water resistance and oil resistance of fabric, realizes the balance of durability, comfort and protection of fabric.

Description

Technical Field

[0001] This invention belongs to the field of protective fabric technology, specifically relating to a protective workwear fabric for antistatic purposes and its preparation method. Background Technology

[0002] With the modernization of industrial production, special protective clothing is increasingly widely used in industries such as petroleum, chemical, pharmaceutical, coal, and metallurgy. In particular, in flammable and explosive environments (such as gas stations and chemical plants) and strong acid and alkali work scenarios (such as electroplating workshops and laboratories), higher requirements are put forward for safety protection.

[0003] Currently, the main problems with antistatic protective raincoat fabrics are as follows: Insufficient antistatic durability; most fabrics rely on surface antistatic coatings or fiber blends (such as polyester + conductive yarn), but after repeated washing, friction, or long-term use, the surface resistivity decreases from 10... 8 Ω increased to 10 12 Above Ω, the antistatic performance decreases significantly.

[0004] Waterproofing and breathability are contradictory; high waterproofing properties (hydrostatic pressure ≥100kPa) of waterproof fabrics often require a dense coating or lamination, but this sacrifices breathability (permeability <3000g / (m²)). 2 (24h), in addition, traditional PTFE microporous membranes are easily contaminated by oils in sweat, which can clog the pores and cause stuffiness and discomfort.

[0005] Poor environmental adaptability and durability; In high-humidity environments, antistatic raincoats typically rely on conductive fibers in the fabric to dissipate static electricity. In high-humidity environments, moisture adheres to the fiber surface. On one hand, the formed water film may cover the conductive fibers, hindering static electricity conduction; on the other hand, the humid environment may cause the fibers to swell, disrupting the originally tight conductive network structure and reducing antistatic performance. Furthermore, high humidity may also affect the performance of the waterproof coating, causing it to absorb water and swell, reducing its waterproof effect. In low-temperature environments, the resistivity of the antistatic raincoat fabric increases, thereby reducing the material's conductivity and preventing static electricity from dissipating quickly. Low temperatures also reduce the fabric's softness, affecting the contact between the fabric and object surfaces, further reducing the antistatic effect. Regarding waterproof performance, low temperatures may make the waterproof membrane brittle and prone to cracking, thus reducing its waterproof performance. In acidic or alkaline environments, acids and alkalis may react chemically with the components in the antistatic raincoat fabric. For example, strong acids and alkalis may corrode the conductive fibers, destroying their conductivity. For waterproof coatings, acidic and alkaline substances may also change their structure, causing the coating to peel off or lose its waterproof function. If exposed to acidic or alkaline environments for a long time, the fiber structure of the fabric may also be damaged, reducing the strength and durability of the fabric, and thus affecting its antistatic and waterproof performance.

[0006] Antistatic and acid / alkali resistant fabrics mainly have the following problems: It's difficult to simultaneously achieve both acid and alkali resistance and antistatic properties. Acid and alkali resistance requires a dense coating with high chemical stability (such as rubber or PTFE), but this blocks conductive pathways, leading to antistatic failure. Adding conductive materials (such as carbon fiber) may be corroded by acids and alkalis, reducing durability. Furthermore, after 10 acid and alkali immersions (5% H2SO4 / NaOH), the surface resistivity of acid and alkali resistant fabrics decreases from 10... 8 Ω increased to 10 12 Above Ω, butyl rubber becomes brittle and cracks at low temperatures. Butyl rubber has a relatively high glass transition temperature (approximately -73℃, but in practical applications, poor formulation can reduce low-temperature toughness). At low temperatures, the molecular chain mobility weakens, causing the fabric to change from an "elastic state" to a "glassy state," losing its toughness. Under external forces (such as bending or vibration), cracks easily appear, disrupting the continuity of the conductive coating and even causing it to peel off. If the surface pretreatment of the coating and the substrate (such as metal or fabric) is inadequate (e.g., lack of degreasing or roughening), or if the coating itself has poor film-forming properties, the adhesion between the two is insufficient. Under the influence of external forces such as washing, friction, and temperature changes, the coating easily peels off from the substrate surface, leading to the failure of the antistatic function. Traditional conductive materials (such as metal fibers and polyaniline) are easily oxidized or degraded in acidic or alkaline environments, and their antistatic performance decreases after repeated washing. For example, metal fibers (copper and nickel fibers) are easily reacted with acids (H+) in acidic or alkaline environments. + ) or base (OH) - Chemical reactions occur (e.g., iron reacts with hydrochloric acid to produce ferrous chloride and hydrogen gas), forming an oxide layer on the surface (e.g., copper oxidizes to copper oxide). This oxide layer is non-conductive, directly blocking the current path and causing a decrease in antistatic performance. After repeated washing, the rubbing and water flow during the washing process can cause metal fibers to break and detach from the substrate, damaging the conductive network and naturally reducing the antistatic effect. After repeated washing, the mechanical action during washing and the chemical action of the detergent can cause conductive materials to detach from the substrate surface, resulting in the loss of conductive components and a decrease in antistatic performance.

[0007] Comfort and protection are difficult to reconcile; due to the tight packing of polymer chains in the coating, the thicker the coating, the more tightly packed the polymers, reducing the free volume and making it difficult for water vapor molecules to penetrate by diffusion; according to Fick's Law, water vapor flux is inversely proportional to thickness, and increased thickness leads to a significant increase in diffusion resistance; at the same time, thick coatings form non-porous or microporous closed structures, eliminating channels for water vapor to flow through pores. Therefore, thick coatings result in a moisture permeability of <2000 g / (m³). 2 • 24h) Wearing it for a long time will hinder the evaporation and excretion of human sweat, making the wearer feel stuffy and hot.

[0008] Insufficient flexibility; because high-protection fabrics often use multi-layer composites, the fabric is stiff. The total modulus of the multi-layer structure is approximately equal to the weighted sum of the moduli of each layer according to its thickness. The more layers and the thicker the coating, the greater the overall stiffness. Furthermore, the plasticizers in the coating migrate to the substrate or environment over time, causing the coating to harden and become brittle, further reducing flexibility. This results in a significant increase in the bending stiffness and shear stiffness of the fabric, affecting operational flexibility.

[0009] High dependence on fluorine-containing materials; since high-performance acid and alkali resistant coatings often contain PFAS (perfluorinated compounds), they are subject to EU REACH regulations. Furthermore, the cost of precious metal conductive materials is high. For example, when the proportion of silver-based conductive fibers exceeds 30%, the cost of the fabric increases by 3-5 times. Summary of the Invention

[0010] To address the aforementioned problems, the present invention aims to provide a protective workwear fabric for antistatic purposes and its preparation method. By treating the high-strength fine-denier polyester fibers in the fabric with a fluorocarbon structure lubricant, the technical bottleneck of the "wicking moisture absorption effect" in the coating is solved, significantly improving the fabric's waterproof and oil-resistant properties, and achieving a balance between the fabric's durability, comfort, and protection.

[0011] To achieve the above objectives, the technical solution adopted by the present invention is as follows: This invention provides a protective workwear fabric for antistatic purposes, comprising a base fabric layer, a mesh layer, and a coating layer. The coating layer is applied to the mesh layer. The base fabric layer is composed of warp and weft yarns interwoven in a 2 / 1 twill weave, wherein both the warp and weft yarns are fine denier high-strength polyester low-elasticity network yarns. The mesh layer is formed by conductive yarns interwoven on the base fabric layer in a warp and weft pattern. The conductive yarns are composed of organic conductive fibers and fine denier high-strength polyester low-elasticity network yarns twisted together. The fine denier high-strength polyester low-elasticity network yarns are surface-treated with a fluorocarbon structural lubricant.

[0012] Furthermore, the fine denier high-strength polyester low-elasticity network yarn undergoes surface treatment with a fluorocarbon structural lubricant, specifically including the following steps: Step S1: Clean the fine denier high-strength polyester low-elasticity network yarn with a cleaning solution to remove the oil, so that the residual oil content is ≤50mg / kg; Step S2: The cleaned fine denier high-strength polyester low-elasticity network yarn is impregnated with impregnation solution to make the liquid content of the fine denier high-strength polyester low-elasticity network yarn 1.35%-2.75%. Step S3: The impregnated fine denier high-strength polyester low-elasticity network yarn is heated and dried in a drying oven to achieve a liquid retention rate of 30±5%. Step S4: The dried fine denier high-strength polyester low-elasticity network yarn is cured by high-temperature baking at 160-180℃ for 1.5-2.5 minutes. Step S5: Quickly cool the fine denier high-strength polyester low-elasticity network yarn after high-temperature curing to below 40°C.

[0013] Furthermore, the cleaning solution is prepared by volume ratio of 1-2 g / L fatty alcohol polyoxyethylene ether and 0.5-1 g / L weak alkaline sodium carbonate solution; the impregnation solution is prepared by volume ratio of 3-8% owf of bifunctional fluorocarbon lubricant, 0.5-1.5% owf of crosslinking agent epoxy silane, 0.2-0.5% g / L of penetrant isomeric alcohol ether, 0.5% owf of nano silica dispersion and acetic acid, and the pH of the impregnation solution is 4-5.

[0014] Furthermore, the high-strength fine denier polyester low-elasticity network yarn has a fineness of 0.89 dtex ± 2.5%, a network density of 80 ± 10 cells / meter, a breaking strength of 7.0 ± 0.5 cN / dtex, and a boiling water shrinkage rate of < 2.0%.

[0015] Furthermore, the resistance range of the organic conductive fiber is 10⁵-10⁷ Ω / cm.

[0016] Furthermore, the mass ratio of the fine denier high-strength polyester low-elasticity yarn to the organic conductive fiber is 98:2-99:1.

[0017] This invention also provides a method for preparing a protective workwear fabric for antistatic purposes, comprising the following steps: Step a1, weaving the greige fabric: the high-strength fine denier polyester low-elasticity network yarn treated with fluorocarbon structural lubricant is successively warped, sized, spun, twisted, threaded, and woven to obtain the greige fabric; The warp yarn has a fineness of 8.3 + 7.7 tex, and the weft yarn has a fineness of 14.8 tex. The slurry used for sizing is prepared by mixing AD, STI202A / 25% and K52 / 40% by volume, with a slurry concentration of 10%±0.5% and a viscosity of 12s. During the weaving process, the ratio of warp base yarn to conductive yarn is 51:1, and the ratio of base yarn to conductive yarn is 35:1 when the weft yarn is introduced. Step b1, fabric dyeing: The fabric obtained in step a1 is pre-shaped, degreased and refined, and then dyed with disperse dyes; Step c1, finishing: heat setting the dyed fabric; Step d1, Coating: Apply a coating to the fabric after step c1; during coating, first apply a thin layer of coating liquid to the fabric, dry it, and then apply a waterproof and breathable coating agent, followed by sandblasting, curing, and drying.

[0018] This invention also provides a method for preparing a protective workwear fabric for antistatic purposes, comprising the following steps: Step a2, weaving the greige fabric: the high-strength fine denier polyester low-elasticity network yarn treated with fluorocarbon structural lubricant is successively warped, sized, threaded, and woven to obtain the greige fabric; The fineness of the warp yarn is 11.1–23.31 tex, and the fineness of the weft yarn is 11.1–23.31 tex. The slurry used for sizing consists of a main slurry and an auxiliary slurry. The main slurry is prepared by volume ratio of 50% PVA-1799 and 40% polyester slurry, and the auxiliary slurry is prepared by volume ratio of 5% antistatic agent and 5% smoothing agent. The slurry concentration is 8%-10%. During the weaving process, the ratio of warp base yarn to conductive yarn is 51:1, and the ratio of base yarn to conductive yarn is 35:1 when the weft yarn is introduced. Step b2, fabric dyeing: The fabric obtained in step a2 is pre-shaped and high-temperature refined, then dyed with disperse dyes, and then subjected to reduction washing, soaping and heat setting. Step c2, acid and alkali resistant finishing: The fabric treated in step b2 is subjected to acid and alkali resistant finishing by pad baking method to form a coating.

[0019] Because the present invention adopts the above technical solution, it has the following advantages and effects: 1. The present invention relates to a protective workwear fabric for antistatic purposes and its preparation method, which is made of fine denier high-strength polyester low-elasticity network yarn interwoven in a 2 / 1 twill weave. This fiber has the advantages of fineness, high strength, and good chemical stability, providing the fabric with good basic mechanical properties and durability. Furthermore, by treating the fine denier high-strength polyester low-elasticity network yarn with a fluorocarbon structural lubricant, the waterproof and oil-proof properties of the fiber are significantly improved, fundamentally suppressing the "wicking effect" commonly found in coating finishing.

[0020] 2. The present invention discloses a protective workwear fabric for antistatic purposes and its preparation method, which uses organic conductive fibers and base fabric fibers to form conductive yarn, and interweaves them in the warp and weft directions to form an embedded mesh layer structure. This structure integrates the conductive fibers uniformly and firmly into the fabric, forming a stable and durable embedded conductive mesh structure, ensuring the durability and reliability of antistatic performance, and overcoming the performance degradation problems caused by easy peeling of surface coatings or easy breakage of blended fibers.

[0021] 3. The present invention provides a protective workwear fabric for antistatic purposes and its preparation method. Through a composite structure of base fabric layer + conductive mesh + coating, it achieves the organic unity of multiple functions such as antistatic, waterproof, acid and alkali resistant, breathable, and flexible. The coating can be customized according to the end use (such as rainproof or acid and alkali resistant) to give the fabric effective protection with specific different properties. Attached Figure Description

[0022] Figure 1 This is a warp cross-sectional view of the workwear fabric of the present invention.

[0023] Figure 2 This is a weft cross-sectional view of the workwear fabric of the present invention. Detailed Implementation

[0024] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings to provide a clearer understanding of the purpose, features, and advantages of the present invention. It should be understood that the embodiments shown in the drawings are not intended to limit the scope of the present invention, but are merely illustrative of the essential spirit of the technical solution of the present invention.

[0025] like Figures 1-2 As shown in the figure. This invention provides a high-performance protective workwear fabric for antistatic raincoats and acid / alkali protection, comprising a base fabric layer, a mesh layer, and a coating. The base fabric layer is composed of warp and weft yarns interwoven in a 2 / 1 twill weave, both of which are fine denier high-strength polyester low-elasticity network yarns. The mesh layer is formed by conductive yarns interwoven on the base fabric layer, consisting of conductive fibers and fine denier high-strength polyester low-elasticity network yarns twisted together. The coating is applied to the mesh layer, and the fine denier high-strength polyester low-elasticity network yarns are surface-treated with a fluorocarbon structural lubricant. In the fabric, the mass ratio of fine denier high-strength polyester low-elasticity yarns to organic conductive fibers is 98:2-99:1.

[0026] Specifically, conductive fiber is a functional fiber that eliminates static electricity through electronic conduction and corona discharge. It usually refers to a fiber with a resistivity of less than 107 Ω / cm under standard conditions (20°C, 65% relative humidity). The conductive fiber of this invention is an organic conductive fiber with a resistance range of 105-107 Ω / cm.

[0027] To ensure the fabric's excellent antistatic properties, the organic conductive fiber of this invention is preferably the nylon-based organic conductive fiber N20D / 3f from the China Textile Research Institute.

[0028] When conductive fibers and fine-denier high-strength polyester low-elasticity network yarns are twisted together, since both are textile fibers with vastly different linear densities and tensile strengths (low-carbon filament and fully drawn filament), ensuring that the twisted conductive yarn can simultaneously leverage the advantages of both fibers and highlight the antistatic properties of the conductive yarn requires controlling the coverage of the conductive fibers on the conductive yarn surface through twisting. This necessitates repeatedly optimizing the effects of tension matching, twisting degree, and twist direction configuration on the yarn's mechanical and antistatic properties. During twisting, a warp or weft mesh is implanted. Specifically, the weft conductive yarn is implanted during fabric weaving at a specific spray ratio, resulting in a designed mesh pattern on the fabric surface from both the warp and weft conductive yarns.

[0029] Finally, the point-to-point resistance of the finished dyed fabric is reduced to 1×10⁻⁶. 7It has an antistatic effect of approximately Ω and retains excellent antistatic properties even after 33 hours (equivalent to 100 washes).

[0030] Furthermore, the fineness of the high-strength fine denier polyester low-elasticity network yarn is 0.89 dtex±2.5%, the network density is 80±10 cells / meter, the breaking strength is 7.0±0.5cN / dtex, and the boiling water shrinkage rate is <2.0%.

[0031] Specifically, due to the small diameter of high-strength fine denier polyester low-elasticity network yarn, its bending stiffness is low, the fiber feels particularly soft, and its specific surface area is very large. It comes into contact with dust or oil more often, and oil has more opportunities to penetrate through the gaps between the fiber surfaces. Therefore, it has extremely strong cleaning function. When made into ultra-high density fabrics, the gaps between the fibers are between the diameter of a water droplet and the diameter of a water vapor droplet, so it has excellent waterproof and breathable effects. Fine denier high-strength polyester low-elasticity network yarn has good chemical stability and can be used in environments with strong acids and alkalis. It is also easy to dye.

[0032] Furthermore, by treating the high-strength fine denier polyester low-elasticity network yarn with a fluorocarbon structural lubricant, the waterproof and oil-proof properties of the high-strength fine denier polyester low-elasticity network yarn can be improved, thus solving the technical bottleneck of the "wick moisture absorption effect" in the final coating.

[0033] The "wicking effect" in coatings refers to a common but strictly controlled negative phenomenon in fabric coating finishing, especially in waterproof / liquid-repellent coatings. Essentially, liquids bypass the physical barrier of the surface coating through capillary action within the fabric (similar to the principle of a wick absorbing oil), penetrating from uncoated areas (such as fiber gaps and yarn seams) into the fabric's interior or to the other side. Therefore, the wicking effect is a hidden killer of coated fabrics, requiring technical measures for prevention.

[0034] This invention involves a coating finish after dyeing, forming one or more thin film coatings on the fabric surface. This not only improves the fabric's appearance and style but also enhances its functionality, giving it special properties such as waterproofing, water pressure resistance, breathability, and acid and alkali resistance. The fluorocarbon structure lubricant, after lubrication, exhibits low surface tension, good heat resistance, and chemical stability, enabling it to effectively form a uniform film on the fiber surface, thereby improving the fiber's smoothness and antistatic properties. The fluorocarbon compounds in the fluorocarbon structure lubricant remain stable at high temperatures, without decomposition or deterioration, making them suitable for high-temperature processing. Fluorocarbon structure lubricants also exhibit good stability against most chemical reagents, making them resistant to corrosion or dissolution.

[0035] Therefore, this invention utilizes fluorocarbon structural lubricants to impart a "self-lubricating armor" to high-strength fine denier polyester low-elasticity network yarns, breaking through the fiber technology bottlenecks in miniaturization and extreme environment applications, and solving the problem of "wick moisture absorption effect".

[0036] Furthermore, the fine denier high-strength polyester low-elasticity network yarn is surface-treated with a fluorocarbon structure lubricant using a continuous yarn finishing production line. Before treatment, the high-strength polyester low-elasticity network yarn is unwound from the bobbin carrying it. Then, the fine denier high-strength polyester low-elasticity network yarn is surface-treated with a fluorocarbon structure lubricant. The treatment specifically includes the following steps: Step S1, pre-cleaning treatment, to remove residual oil from the fine denier high-strength polyester low-elasticity network yarn, ensuring that the residual oil content is ≤50mg / kg. During cleaning, the cleaning device is set on a guide rail, and cleaning fluid is placed inside the cleaning device. When the fine denier high-strength polyester low-elasticity network yarn passes through the guide rail, it is ultrasonically cleaned by the cleaning device for 15-20 minutes.

[0037] The preferred cleaning device is an ultrasonic cleaner. The cleaning solution is prepared by mixing 1-2 g / L of fatty alcohol polyoxyethylene ether and 0.5-1 g / L of weak alkaline sodium carbonate solution (pH 9-10) in a volume ratio. During the cleaning process, the temperature of the cleaning solution is 70-80℃.

[0038] Step S2: Impregnate the cleaned fine denier high-strength polyester low-elasticity network yarn with impregnation solution, and control the liquid content of the fine denier high-strength polyester low-elasticity network yarn to be maintained at 1.35%-2.75%.

[0039] During impregnation, the fine denier high-strength polyester low-elasticity network yarn first passes through the emulsion tank of the impregnation mill, where the impregnation liquid is added. Then, it passes through a pair of precision rollers of the impregnation mill, and the amount of liquid carried by the high-strength polyester low-elasticity network yarn is controlled by controlling the speed of the rollers to achieve fluorocarbon structure lubrication of the fine denier high-strength polyester low-elasticity network yarn.

[0040] The impregnation solution is prepared by volume ratio of 3-8% owf of a bifunctional fluorocarbon lubricant, 0.5-1.5% owf of a crosslinking agent (epoxysilane), 0.2-0.5% g / L of a penetrant (isomeric alcohol ether), 0.5% owf of a nano-silica dispersion, and acetic acid, and the pH is adjusted to 4-5. During the impregnation treatment, the bath ratio is 1:10-1:15, the impregnation solution temperature is 40-50℃, and the impregnation time is 10-15 minutes.

[0041] Step S3: The fine denier high-strength polyester low-elasticity network yarn after impregnation treatment is heated and dried in a drying oven to achieve a liquid retention rate of 30±5%. The heating and drying temperature is 100-110℃, and the heating time is 1-3 minutes.

[0042] Step S4: The dried fine denier high-strength polyester low-elasticity network yarn is cured by high-temperature curing in a hot air circulating high-temperature curing box at a temperature of 160-180℃ for 1.5-2.5 minutes.

[0043] Step S5: The fine denier high-strength polyester low-elasticity network yarn that has been baked at high temperature is cooled and shaped by a cooling box. During cooling, the cold air is kept to cool rapidly to below 40°C in order to lock the fluorocarbon molecular orientation structure of the fine denier high-strength polyester low-elasticity network yarn.

[0044] The high-strength polyester low-elasticity network yarns processed through steps S1-S5 were tested, and the results are shown in Table 1. Table 1

[0045] In Table 1, the dynamic friction coefficient μ is a core indicator measuring the ease of sliding between two yarns or between a yarn and machine parts. A lower value indicates less friction and smoother sliding. The dynamic friction coefficient μ (≤0.20) after surface treatment with a fluorocarbon structure lubricant is significantly lower than that of the original yarn (0.35-0.45), representing a substantial performance improvement, with the friction coefficient reduced by approximately 40%-50%. Because the fluorocarbon structure lubricant forms an extremely slippery film on the fiber surface, it greatly reduces friction, allowing the yarn to pass smoothly through guides, heddle loops, and other components during subsequent weaving and knitting processes, reducing yarn breaks and fuzz, and improving production efficiency and product quality.

[0046] Water repellency measures a fabric’s ability to resist water wetting. The higher the score (out of 100), the better the water repellency. Water repellency also assesses durability, meaning that the fabric can maintain good water repellency after 20 washes.

[0047] Fluorocarbon-based lubricants are not only smooth but also have extremely low surface energy, causing water droplets to roll off instead of spread out. This stable, low-surface-energy film is the physical basis for achieving long-lasting lubrication. Excellent water repellency and durability indirectly prove that fluorocarbon-based lubricants form a strong and stable coating layer on the fiber surface, which is a prerequisite for achieving long-lasting "self-lubrication."

[0048] Stain resistance measures a fabric's ability to resist common stains (oil stains), typically using a rating system from 1 to 8, with higher numbers indicating better stain resistance. Olive oil represents kitchen oil stains, while n-hexane represents gasoline and solvent-based oil stains.

[0049] The water-repellent principle is similar to the three-proof properties (waterproof, oil-proof, and stain-proof) of fluorocarbon structure lubricants. Oil and dirt have difficulty adhering to the low surface energy fluorocarbon film, which ensures the long-term stability of lubrication performance in complex operating environments.

[0050] Washability directly assesses the durability of the lubricating effect of fluorocarbon-structured lubricants, requiring that even after 50 harsh washes, the core friction coefficient should not deteriorate significantly (the change rate should not exceed 15%). Since ordinary lubricating coatings may peel off and fail after a few washes or friction cycles, washability requires that the fluorocarbon-structured lubricant remain stable after 50 washes. This indicates that the fluorocarbon-structured lubricant has formed a strong chemical bond or physical cross-link with the fiber, rather than merely physical adsorption. This strong bond allows the lubricating function of the fluorocarbon-structured lubricant to exist "permanently" within the fiber, thus achieving true "self-lubrication."

[0051] In summary, the test results in Table 1 show that by using fluorocarbon structural lubricants to give high-strength fine denier polyester low-elasticity network yarns a "self-lubricating armor," the technological bottleneck of fiber miniaturization and extreme environment applications can be overcome.

[0052] Example 1 Antistatic protective raincoat and workwear fabric was prepared using high-strength, fine-denier, low-elasticity polyester network yarn treated with a fluorocarbon structural lubricant. In the fabric of Example 1, the warp yarn fineness was 8.3 + 7.7 tex, and the weft yarn fineness was 14.8 tex.

[0053] Specifically, this includes step a1, weaving the greige fabric. High-strength fine denier polyester low-elasticity network yarns treated with fluorocarbon structural lubricant are sequentially warped, sized, spun, twisted, threaded, and woven to obtain the greige fabric.

[0054] During warping, a Tsudakoma TWN-e warping machine is used, requiring low speed and low tension to prevent the yarn bundle from splitting.

[0055] The warping process parameters are as follows: speed 200m / min; single yarn tension 2.9cN; yarn frame tensions: front 1.96cN, middle 0.98cN, back 0.98cN; hardness 70; pressure roller pressure 0.2Mpa; hairiness sensitivity S:L=6:5; crimp tension 107.8cN.

[0056] During sizing, a Tsudakoma KSH500-e sizing machine is used. Sizing, through appropriate penetration, increases adhesion to improve bundle cohesion and prevent fuzzing caused by splitting. The coating improves the integrity of the sizing film, conforms to the fuzz, eliminates static electricity, and increases smoothness. In addition, water repellency during weaving and ease of desizing during subsequent soaping and boiling must also be considered.

[0057] The slurry is prepared by volume ratio of AD, STI202A / 25% and K52 / 40%, with a slurry concentration of 10%±0.5% and a viscosity of 12s (water value 3.7s). Since STI202A is a water-dispersible acrylate copolymer, according to the principle of similar compatibility, it has an affinity for high-strength fine denier polyester low-elasticity network yarns that also contain ester groups. It appears as a milky yellow viscous liquid with a solids content of 23%±0.5% and a rotational viscosity of 35±5 MPa. It has good adhesion to synthetic fibers, produces a soft slurry film, and has no re-adhesion, making it suitable for water jet loom weaving.

[0058] The sizing process parameters are as follows: speed 55 m / min; draw A is +0.1%, B is +0.8%; oiling: X600; oiling roller speed is 2.0 m / min; sizing roller pressure is 0.18 MPa; monofilament output tension is 5.2 cN; monofilament winding tension is 8.3 cN; hardness is 70 degrees; sizing tank temperature is 45℃±5℃; drying room temperature is 130℃±5℃; cylinder temperature (±5℃) is 120℃, 120℃, 115℃, 115℃ and 105℃ respectively.

[0059] When paralleling shafts, the Tsudakoma paralleling machine KB30-e is used.

[0060] The parallel winding process parameters are: unwinding tension 1626N; winding tension 1862N; hardness 78 degrees; linear speed 100m / min.

[0061] When slitting, use the Fujido TC-700-90 slitting machine.

[0062] The slitting process parameters are: slitting reference structure 1:1; speed 300r / min.

[0063] When threading heddles, a Staubli SAFIRS32 automatic heddle threading machine is used.

[0064] The process parameters are set as follows: warp beam combing; preparation of heddles, stop warp clips, and reeds; preparation of skipping needles; During weaving, a Tsudakoma ZW408 water jet loom is used, with a warp yarn to conductive yarn ratio of 51:1. When the weft yarn is introduced, the ratio of the base yarn to the conductive yarn is 35:1.

[0065] The weaving process parameters are as follows: loom speed 450r / min; sheath angle 355°; first heald frame opening 54mm; weight setting 2.0kg; back beam height 90mm; nozzle type PF17-20A; actual spray angle 90°; weft yarn arrival angle 235°; yarn clamp (open-closed) 105°-290°; water volume 8mm; lead angle 15°; weft beat-up stroke 66mm; selvedge angle (L / R) 80° / 20°; selvedge support angle 11°; and MLO mechanical warp feeding is adopted; warp feeding relative humidity 68-74%; warp feeding temperature 23-27℃.

[0066] Step b1, dyeing the greige fabric.

[0067] The dyeing of high-strength fine denier polyester low-elasticity network yarn is more difficult than that of conventional polyester fibers, which has always been a pain point in the industry. From a technical point of view, four thorny issues need to be addressed: ① the contradiction between the high orientation structure and the dye diffusion rate; ② the problem that the specific surface area of ​​high-strength fine denier polyester low-elasticity network yarn is greater than its level dyeing properties; ③ the contradiction between high-temperature dyeing and fiber damage; ④ the fluorocarbon structure lubricant treatment causes the fiber to form a hydrophobic film with low surface energy (about 10-15Mn / m), which will significantly affect fabric dyeing, such as insufficient dye uptake, poor level dyeing properties, and decreased color fastness.

[0068] This invention involves pre-treating the greige fabric after inspection, followed by dyeing.

[0069] During pretreatment, a scouring and bleaching machine is used to remove oil and impurities from the fiber surface to ensure uniform dyeing.

[0070] The pretreatment includes: step b11, pre-setting, to stabilize the fabric size and prevent deformation during dyeing, while also opening up the fiber microstructure to improve dye adsorption. The pre-setting temperature is 180-190℃.

[0071] Step b12, degreasing and refining: using an alkaline refining agent (such as NaOH + penetrant), boil at 100℃ for 30-40 minutes to remove residual oil and impurities from the weaving process, and wash with water until neutral.

[0072] During dyeing, bright red dye is used, and highly washable disperse dyes (Longsheng Disperse Red WBRT and Disperse Red WFST) are selected to ensure color fastness and brightness. A DB211-D high-temperature and high-pressure overflow dyeing machine (Wuxi Dongbao Machinery) is used for dyeing.

[0073] The dyeing process parameters are: liquor ratio 1:10-1:15; pH value 4.7-5.7 (adjusted with acetic acid, a weakly acidic environment prevents dye hydrolysis).

[0074] The dyeing procedure is as follows: first, dye at room temperature, then raise the temperature to 130℃ at a rate of 1-2℃ / min and keep it at that temperature for 80-90 minutes; then slowly lower the temperature to below 60℃ (to avoid large temperature differences that could cause wrinkles on the fabric); after dyeing, wash with soap (80℃, 15-25 minutes) to remove excess dye and improve color fastness.

[0075] Step c1 involves finishing the dyed greige fabric. Finishing uses a heat-setting process, which stabilizes the color, improves the fabric's feel, and prepares it for coating.

[0076] During heat setting, the heat setting machine used is the German Montex-6000 model.

[0077] The heat setting process parameters are: temperature 170-180℃; machine speed 35-40m / min; heat setting time 30-40 seconds, to ensure uniform fabric width and smooth surface.

[0078] Step d1 involves applying a coating to the finished fabric.

[0079] During the coating process, the coating liquid is applied to the fabric to undergo a chemical reaction, cross-linking to form a film, resulting in a coating that is elastic and tough.

[0080] The coating liquid is based on polyurethane resin, and is composed of additives (chain extenders, catalysts, leveling agents, ultraviolet absorbers) and solvents (polyols, DMF, toluene; water-based systems use water as the solvent).

[0081] The polyurethane resin used is MDI with a purity of 99%.

[0082] The solvent is a polyol, specifically a mixture of polyether polyol (number average molecular weight 1000) and polyester polyol (number average molecular weight 2000) at a mass ratio of 3:2.

[0083] The chain extender is 1,4-butanediol, and the amount added is 3% of the total mass of polyurethane resin and solvent.

[0084] The catalyst used was DBTDL, and its dosage was 0.5% of the total mass of the raw materials.

[0085] The leveling agent is added at a rate of 0.3% of the total mass of the raw materials.

[0086] The amount of ultraviolet absorber added is 0.5% of the total mass of the raw materials.

[0087] In the preparation of the coating liquid, MDI was added to a reactor equipped with a stirrer, thermometer, and reflux condenser, and the temperature was raised to 60°C. The mixture was stirred at 200 r / min and slowly added dropwise over 1.5 hours. After the addition was completed, the reaction continued for 3 hours. The -NCO content was found to be 55% of the theoretical value, and a prepolymer was obtained. The prepolymer was cooled to 35°C, and 1,4-butanediol was added. The mixture was stirred rapidly for 45 minutes. DBTDL, leveling agent, and UV absorber were added sequentially, and the mixture was stirred at 300 r / min for 30 minutes at room temperature to obtain the coating liquid.

[0088] When applying the coating liquid, use a scraper to first apply a thin layer of the coating liquid (solid content 20-25%) to the fabric, then dry it at 100-120℃ to enhance the adhesion between the fabric and the waterproof and breathable coating agent. Next, apply the waterproof and breathable coating agent (containing hydrophilic groups or a microporous structure), with a solid content of 20-30%, and a coating thickness of approximately 20-30 g / m². 2 Achieve waterproof (hydrostatic pressure ≥100Kpa) and breathable (≥5000g / m²) properties. 2 • 24h) performance; then the fabric is passed through a roller mill and sandblasted, with the coating thickness controlled at 80±5μm, then cured at 80℃ for 2 hours; finally, it is dried at 145-155℃ to allow the waterproof and breathable coating agent to crosslink and form a film, improving wash resistance and functional stability, resulting in a fabric with a unit area mass of 150-170g / m². 2 Antistatic protective raincoat and workwear fabric.

[0089] Example 2 Acid and alkali resistant, antistatic protective workwear fabric was prepared using high-strength, fine-denier, low-elasticity polyester network yarn treated with a fluorocarbon structural lubricant. In the fabric of Example 2, the warp yarn fineness is 11.1–23.31 tex; the weft yarn fineness is 11.1–23.31 tex.

[0090] Specifically, this includes step a2, weaving the greige fabric. High-strength, fine-denier polyester low-elasticity network yarns treated with fluorocarbon structural lubricant are sequentially warped, sized, threaded, and woven to obtain the greige fabric.

[0091] During warping, a Karl Mayer HKS 3-M warping machine is used, requiring low speed and low tension to prevent the yarn bundles from splitting.

[0092] The warping process parameters are as follows: speed 800-1000 m / min (adjusted according to filament cohesion to avoid fuzz); single yarn tension 8-12 cN (using a segmented tensioner to ensure yarn tension uniformity ≤3%); winding density 0.55-0.60 g / cm³. 3 This ensures that the warp beam is formed smoothly without yarn compression or edge collapse.

[0093] During sizing, the Tsudakoma HS20N sizing machine is used, equipped with a double-immersion double-pressure sizing tank and a hot air and drying cylinder composite drying system to meet the sizing requirements of polyester filament.

[0094] The slurry consists of a main slurry and an auxiliary slurry. The main slurry is prepared by volume ratio of 50% PVA-1799 and 40% polyester slurry. The main slurry can improve adhesion and abrasion resistance.

[0095] The auxiliary sizing agent is prepared by volume ratio of 5% antistatic agent and 5% smoothing agent. The auxiliary sizing agent can solve the problems of static electricity and fuzzing of filaments. The sizing concentration is 8%-10%, and the sizing viscosity is 20-25s (Ford cup 4, 25℃).

[0096] The sizing process parameters are as follows: speed 60-80m / min (to avoid sizing seepage); sizing rate 4%-6%; sizing pressure: front pressure 15-20kN, rear pressure 25-30kN (double pressure ensures uniform penetration of sizing and squeezes out excess sizing); drying temperature: hot air zone 80-90℃, drying cylinder zone 110-120℃ (gradient heating is adopted to prevent warp yarn breakage caused by sudden coagulation of sizing).

[0097] When threading heddles, a Staubli SAFIRS32 automatic heddle threading machine is used.

[0098] The process parameters are set as follows: warp beam combing; preparation of heddles, stop warp clips, and reeds; preparation of skipping needles; During weaving, a Toyota JAT810 high-speed air-jet loom is used, with a warp yarn to conductive yarn ratio of 51:1. When the weft yarn is introduced, the ratio of the base yarn to the conductive yarn is 35:1.

[0099] The weaving process parameters are as follows: loom speed 450-550 r / min; loom tension 1800-2200 N; stop warp spacing 3.5-4.0 mm; shedding time 280-300°; weft insertion pressure: main nozzle 0.35-0.40 MPa, auxiliary nozzle 0.25-0.30 MPa; weft striking force 2000-2500 N.

[0100] Step b2, dyeing the greige fabric.

[0101] This invention involves pre-treating the greige fabric after inspection, followed by dyeing.

[0102] During pretreatment, a scouring and bleaching machine is used to remove oil and impurities from the fiber surface to ensure uniform dyeing.

[0103] The pretreatment specifically includes: step b21, pre-shaping, to stabilize the fabric size and avoid deformation during dyeing, while opening the fiber microstructure and improving dye adsorption.

[0104] The pre-set process parameters are as follows: High-temperature scouring: NaOH 2-3g / L, scouring agent 1-2g / L, 130℃×30 minutes, wash with water until neutral. Setting: 180℃×30 seconds, to stabilize fabric dimensions and prevent shrinkage during dyeing.

[0105] Step b22, disperse dye staining; ① Dye selection: The main colors are Disperse Deep Blue ECO (Longsheng High Fastness) and Disperse Ruby S-5BL (Longsheng). Disperse Orange S-4GL (Longsheng) is used for color mixing, with a small amount of Disperse Black to enhance the depth of the navy blue. The amount of dye used should be adjusted according to the color depth (e.g., about 3-5% owf for medium to dark colors), and a sample should be made in advance to confirm the formula.

[0106] ② Dyeing process; High-temperature and high-pressure dyeing (130℃×30-40 minutes): liquor ratio 1:10-15, pH value 4.5-5.5 (adjusted with acetic acid), anti-migration agent 1-2g / L, leveling agent 1g / L. Dyeing temperature rise curve: room temperature → 2℃ / min → 130℃ → hold for 30 minutes → cool down to 80℃.

[0107] ③ Reduction cleaning (key): 3-4g / L sodium hydrosulfite, 2-3g / L NaOH, 70-80℃×30 minutes, wash with water until neutral to remove floating color and improve color fastness.

[0108] ④ Soap washing and heat setting; Soap washing process parameters: 1-2g / L soaping agent, 80℃×15 minutes, wash with water and then dry.

[0109] Heat setting process parameters: 170-180℃ × 30-40 seconds, control the width, stabilize the color, and prepare for subsequent finishing.

[0110] Step c2, acid and alkali resistant finishing: By impregnating the fabric with a finishing agent, an acid and alkali resistant protective film is formed on the fabric surface, forming a coating to block the penetration of acid and alkali solutions.

[0111] ① Selection of finishing agents; The fabric uses FK-532DH (fluorocarbon polymer) and FK-L2M (thermally reactive water-soluble polymer resin), both produced by Beijing Zhongfang Chemical Co., Ltd. It not only gives the fabric excellent acid and alkali resistance, but also provides it with good water and oil resistance, fabric flexibility, and washability, forming a dual protection of "acid and alkali resistance + water and oil resistance".

[0112] ② Finishing process (padding-baking method); Preparation of finishing solution and padding, acid and alkali resistant finishing agent FK-532DH 45-55g / L (adjust according to the acid and alkali resistance level, such as strong acid and alkali resistance, the concentration needs to be increased by 10-20g / L).

[0113] Water and oil repellent synergist FK-L2M 15-25g / L promotes cross-linking reaction and wash resistance.

[0114] A roll-off rate of 60-80% ensures uniform adhesion of the finishing liquid.

[0115] Pre-drying: 80-100℃, dry until semi-dry to prevent the migration of finishing agents.

[0116] ③ Baking and crosslinking; temperature 160-170℃, time 2-3 minutes (high temperature causes the finishing agent to react with the fiber). Cross-linking forms a waterproof and acid / alkali resistant film.

[0117] The above steps are used to obtain acid and alkali resistant and antistatic protective workwear fabric with a unit area mass of 290-300g / m2.

[0118] Performance tests were conducted on the acid and alkali resistant and antistatic protective workwear fabric of Example 2: ① Acid and alkali resistance: Acid resistance test: Expose the fabric to 80% sulfuric acid and 30% hydrochloric acid, and observe whether the fabric is damaged or discolored (GB / T 3922).

[0119] Alkali resistance test: Contact with 40% sodium hydroxide to test strength retention and appearance change (GB / T 23315).

[0120] - Color fastness: Wash fastness (GB / T 3921) and rubbing fastness (GB / T 3920) ≥4 grade, sublimation fastness (180℃, 30 seconds) ≥4-5 grade.

[0121] ② Physical performance test: The breaking strength (GB / T 3923.1) and tear strength (GB / T 3917.3) must meet the requirements of the finished product (210D specification fabric has higher strength, so excessive hardening after finishing should be avoided).

Claims

1. A protective workwear fabric for antistatic purposes, characterized in that, The product comprises a base fabric layer, a mesh layer, and a coating layer. The coating layer is applied to the mesh layer. The base fabric layer is composed of warp and weft yarns interwoven in a 2 / 1 twill weave. Both the warp and weft yarns are fine denier high-strength polyester low-elasticity network yarns. The mesh layer is formed by conductive yarns interwoven on the base fabric layer in a warp and weft pattern. The conductive yarns are composed of organic conductive fibers and fine denier high-strength polyester low-elasticity network yarns twisted together. The fine denier high-strength polyester low-elasticity network yarns are surface-treated with a fluorocarbon structural lubricant.

2. The protective workwear fabric for antistatic purposes according to claim 1, characterized in that, The fine denier high-strength polyester low-elasticity network yarn is surface-treated with a fluorocarbon structural lubricant, specifically including the following steps: Step S1: Clean the fine denier high-strength polyester low-elasticity network yarn with a cleaning solution to remove the oil, so that the residual oil content is ≤50mg / kg; Step S2: The cleaned fine denier high-strength polyester low-elasticity network yarn is impregnated with impregnation solution to make the liquid content of the fine denier high-strength polyester low-elasticity network yarn 1.35%-2.75%. Step S3: The impregnated fine denier high-strength polyester low-elasticity network yarn is heated and dried in a drying oven to achieve a liquid retention rate of 30±5%. Step S4: The dried fine denier high-strength polyester low-elasticity network yarn is cured by high-temperature baking. Step S5: Quickly cool the fine denier high-strength polyester low-elasticity network yarn after high-temperature curing to below 40°C.

3. The protective workwear fabric for antistatic purposes according to claim 2, characterized in that, The cleaning solution is prepared by volume ratio of 1-2 g / L fatty alcohol polyoxyethylene ether and 0.5-1 g / L weak alkaline sodium carbonate solution.

4. The protective workwear fabric for antistatic purposes according to claim 2, characterized in that, The impregnation solution is prepared by volume ratio of 3-8% owf of bifunctional fluorocarbon lubricant, 0.5-1.5% owf of crosslinking agent epoxy silane, 0.2-0.5% g / L of penetrant isomeric alcohol ether, 0.5% owf of nano silica dispersion, and acetic acid. The pH of the impregnation solution is 4-5.

5. A protective workwear fabric for antistatic purposes according to any one of claims 1-4, characterized in that, The high-strength fine denier polyester low-elasticity network yarn has a fineness of 0.89 dtex ± 2.5%, a network density of 80 ± 10 cells / meter, a breaking strength of 7.0 ± 0.5 cN / dtex, and a boiling water shrinkage rate of < 2.0%.

6. The protective workwear fabric for antistatic purposes according to claim 5, characterized in that, The resistance range of the organic conductive fiber is 10⁵-10⁷ Ω / cm.

7. The protective workwear fabric for antistatic purposes according to claim 6, characterized in that, The mass ratio of the fine denier high-strength polyester low-elasticity yarn to the organic conductive fiber is 98:2-99:

1.

8. A method for preparing a protective workwear fabric for antistatic purposes as described in any one of claims 1-7, characterized in that, Includes the following steps: Step a1, weaving the greige fabric: the high-strength fine denier polyester low-elasticity network yarn treated with fluorocarbon structural lubricant is successively warped, sized, spun, twisted, threaded, and woven to obtain the greige fabric; The warp yarn has a fineness of 8.3 + 7.7 tex, and the weft yarn has a fineness of 14.8 tex. The slurry used for sizing is prepared by mixing AD, STI202A / 25% and K52 / 40% by volume, with a slurry concentration of 10%±0.5% and a viscosity of 12s. During the weaving process, the ratio of warp base yarn to conductive yarn is 51:1, and the ratio of base yarn to conductive yarn is 35:1 when the weft yarn is introduced. Step b1, fabric dyeing: The fabric obtained in step a1 is pre-shaped, degreased and refined, and then dyed with disperse dyes; Step c1, finishing: heat setting the dyed fabric; Step d1, Coating: Apply a coating to the fabric after step c1; during coating, first apply a thin layer of coating liquid to the fabric, dry it, and then apply a waterproof and breathable coating agent, followed by sandblasting, curing, and drying.

9. A method for preparing a protective workwear fabric for antistatic purposes as described in any one of claims 1-7, characterized in that, Includes the following steps: Step a2, weaving the greige fabric: the high-strength fine denier polyester low-elasticity network yarn treated with fluorocarbon structural lubricant is successively warped, sized, threaded, and woven to obtain the greige fabric; The fineness of the warp yarn is 11.1–23.31 tex, and the fineness of the weft yarn is 11.1–23.31 tex. The slurry used for sizing consists of a main slurry and an auxiliary slurry. The main slurry is prepared by volume ratio of 50% PVA-1799 and 40% polyester slurry, and the auxiliary slurry is prepared by volume ratio of 5% antistatic agent and 5% smoothing agent. The slurry concentration is 8%-10%. During the weaving process, the ratio of warp base yarn to conductive yarn is 51:1, and the ratio of base yarn to conductive yarn is 35:1 when the weft yarn is introduced. Step b2, fabric dyeing: The fabric obtained in step a2 is pre-shaped and high-temperature refined, then dyed with disperse dyes, and then subjected to reduction washing, soaping and heat setting. Step c2, acid and alkali resistant finishing: The fabric treated in step b2 is subjected to acid and alkali resistant finishing by pad baking method to form a coating.

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