Anti-static dacron dust-free fabric and preparation method thereof

Abstract

The application belongs to the field of fabrics, and discloses an anti-static polyester dust-free fabric and a preparation method thereof. The preparation method comprises the following steps: mixing a polyether antistatic agent, an epoxy chain extender and polyester chips, melting the mixture to obtain an antistatic core layer melt, wherein the polyether antistatic agent contains hydroxyl groups; melting the polyester chips to obtain a polyester skin layer melt; and then, the antistatic core layer melt and the polyester skin layer melt are compounded and spun to obtain a composite polyester with an antistatic layer as the core layer and a polyester skin layer as the skin layer, wherein the thickness of the polyester skin layer is less than that of the antistatic layer; the composite polyester is spun and heat set to obtain a polyester fabric, and then the polyester fabric is subjected to plasma activation treatment in an oxidizing atmosphere to obtain the anti-static polyester dust-free fabric. The anti-static polyester dust-free fabric prepared by the above method can effectively prevent the loss of antistatic components and improve the anti-static performance of the fabric.

Description

Technical Field

[0001] This application relates to the field of fabrics, specifically to an antistatic polyester dust-free fabric and its preparation method. Background Technology

[0002] Polyester, scientifically known as polyester fiber, is a polymer compound produced by the polycondensation reaction of terephthalic acid and ethylene glycol. Its molecular chain structure is regular, highly crystalline, and lacks hydrophilic polar groups, making it a typical hydrophobic insulating material. Due to the tight packing of polyester molecular chains and the lack of ionizable or polarizable groups, its volume resistivity is extremely high. Therefore, during friction, the charge cannot migrate, conduct, and neutralize quickly along the fiber surface or within the fiber, easily accumulating static charge on the fiber surface. This can lead to dust accumulation, electric shocks, and even damage to precision electronic components. Therefore, surface coating technology is commonly used in industry. A working fluid containing antistatic functional components is applied to the surface of polyester fabric through processes such as impregnation, padding, or spraying, followed by drying and baking to fix it. This creates a continuous conductive or hydrophilic film on the fiber surface, reducing surface resistivity and accelerating static charge leakage.

[0003] However, because antistatic agents adhere to the fiber surface only through physical adsorption or weak chemical bonds, their bonding strength with the smooth and chemically inert polyester substrate is limited. This insufficient bonding strength is further amplified during subsequent washing. First, the strong rinsing of water and repeated rubbing of the fabric during washing generate continuous mechanical erosion. Since polyester fibers have a smooth surface and high chemical inertness, the antistatic agent adheres to it only through physical adsorption or weak hydrogen bonds, resulting in a bonding strength far lower than the fiber's own cohesion. Therefore, the coating is prone to cracking, peeling, or even complete detachment under mechanical forces, causing breaks in the conductive path. Second, the surfactants in detergents have emulsifying and solubilizing effects. Their lipophilic groups encapsulate the hydrophobic segments of the antistatic agent molecules, while their hydrophilic groups extend into the aqueous phase, forming micelle structures that separate the antistatic agent from the fiber surface and disperse it in the washing liquid. This chemical desorption process accumulates with each wash, causing the effective concentration of antistatic agent on the fiber surface to decrease gradually. The synergistic effect of physical peeling and chemical desorption causes the conductive film on the surface of the surface-coated antistatic polyester fabric to gradually lose its integrity and continuity after repeated conventional washing, resulting in a sharp decline or even complete failure of the antistatic effect. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide an antistatic polyester cleanroom fabric and its preparation method, aiming to solve the problem that the antistatic effect of the antistatic polyester cleanroom fabric is reduced due to insufficient bonding force of the antistatic agent during the washing process.

[0005] To address the aforementioned technical problems, a method for preparing antistatic polyester dust-free fabric is proposed, comprising the following steps: S1. Polyether-type antistatic agent, epoxy chain extender and polyester chips are mixed and melted to obtain antistatic core layer melt, wherein the polyether-type antistatic agent contains hydroxyl groups; S2. Melt polyester chips to obtain polyester skin melt, then composite spin antistatic core melt and polyester skin melt to obtain composite polyester with antistatic core and polyester skin, wherein the thickness of polyester skin is less than the thickness of antistatic layer. S3. The composite polyester is spun and heat-set to obtain polyester fabric. Then, the polyester fabric is subjected to plasma activation treatment in an oxidizing atmosphere to obtain antistatic polyester dust-free fabric.

[0006] In addition, an antistatic polyester cleanroom fabric is proposed, which is prepared by the above-described method for preparing an antistatic polyester cleanroom fabric.

[0007] As can be seen from the above technical solutions, the exemplary embodiments disclosed herein possess at least the following advantages and positive effects: On the one hand, a technique is adopted to covalently graft polyether-type antistatic agents and polyester chips with epoxy chain extenders to form an antistatic core layer. Then, a core-sheath composite spinning technique is used to coat the surface of the antistatic core layer with a polyester sheath. Through the ring-opening reaction between the epoxy groups of the epoxy chain extender and the hydroxyl groups in the polyether-type antistatic agent, or the hydroxyl or carboxyl groups in the polyester, a stable covalent bond is formed. This transforms the traditional physical adsorption fixation of the antistatic components into chemical bond fixation. Simultaneously, the polyester sheath forms a continuous coating and isolation layer for the antistatic core layer, reducing the direct effects of water rinsing, fabric rubbing, and detergent emulsification on the antistatic components during washing. This solves the problems of insufficient bonding between the antistatic agent and polyester, and rapid degradation of antistatic performance due to easy desorption and loss during washing, as seen in existing technologies. This achieves long-term stable fixation of the antistatic components within the fiber, improving the washability and antistatic performance retention rate of the antistatic polyester cleanroom fabric.

[0008] On the other hand, by setting the thickness of the antistatic core layer to be greater than that of the polyester sheath and by subjecting the polyester sheath to oxidizing atmosphere plasma activation treatment, a continuous and stable electrostatic dissipation body is constructed using the antistatic core layer with a larger cross-sectional area. This shortens the radial transmission distance between the antistatic core layer and the fiber surface. At the same time, plasma activation further introduces oxygen-containing polar functional groups such as hydroxyl and carboxyl groups into the surface of the polyester sheath, improving the surface energy and moisture absorption capacity of the polyester sheath. This forms a hydrophilic layer on the fiber surface that is conducive to the migration of static charge, thereby establishing an electrostatic conduction path of rapid surface collection—sheath transmission—core continuous dissipation. This further overcomes the problem that the high insulation of the polyester sheath makes it difficult for static charge to be transferred to the antistatic core layer in a timely manner, achieving rapid discharge and continuous dissipation of static charge and improving the antistatic performance of polyester fabric. Attached Figure Description

[0009] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure. It is obvious that the drawings described below are merely some embodiments of this disclosure, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort. In the drawings: Figure 1 This is a schematic diagram of a method for preparing an antistatic polyester dust-free fabric in one embodiment; Figure 2 This is a schematic diagram of step S1 in the preparation method of antistatic polyester dust-free fabric in one embodiment. Figure 3 This is a schematic diagram of step S2 in the preparation method of antistatic polyester dust-free fabric in one embodiment; Figure 4 This is a schematic diagram of step S3 in the preparation method of antistatic polyester dust-free fabric in one embodiment. Detailed Implementation

[0010] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be more thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art.

[0011] Furthermore, the described features or characteristics may be combined in any suitable manner in one or more embodiments. Numerous specific details are provided in the following description to give a thorough understanding of embodiments of this disclosure. However, those skilled in the art will recognize that the technical solutions of this disclosure may be practiced without one or more of the specific details, or other methods, steps, etc. may be employed. In other instances, well-known methods, implementations, or operations are not shown or described in detail to avoid obscuring various aspects of this disclosure.

[0012] The flowcharts shown in the accompanying drawings are merely illustrative and do not necessarily include all content and operations / steps, nor do they necessarily have to be performed in the described order. For example, some operations / steps can be broken down, while others can be combined or partially combined; therefore, the actual execution order may change depending on the specific circumstances.

[0013] Please refer to Figure 1 This invention proposes a method for preparing an antistatic polyester dust-free fabric, the method comprising the following steps: S1. Polyether-type antistatic agent, epoxy chain extender and polyester chips are mixed and melted to obtain antistatic core layer melt, wherein the polyether-type antistatic agent contains hydroxyl groups.

[0014] In step S1, the polyether-type antistatic agent includes at least one of polyethylene glycol, polytetrahydrofuran glycol, and polypropylene glycol; the polyester chips include at least one of polyethylene terephthalate, polybutylene terephthalate, and polypropylene terephthalate; and the epoxy chain extender includes at least one of polyethylene glycol diglycidyl ether, trimethylolpropane triglycidyl ether, and pentaerythritol tetraglycidyl ether.

[0015] An antistatic core layer melt was prepared by co-melting a polyether-type antistatic agent, an epoxy chain extender, and polyester chips. The epoxy groups in the epoxy chain extender preferentially undergo ring-opening reactions with the carboxyl and hydroxyl groups at the ends of the polyester molecular chains, and further undergo ring-opening grafting reactions with the hydroxyl groups in the polyether-type antistatic agent. This constructs a stable bridging covalent bond structure between the polyester molecular chains and the polyether-type antistatic agent, transforming the traditional physical blending or surface adhesion method of the polyether-type antistatic agent into chemical bonding fixed within the polyester matrix. This prevents migration, precipitation, or detachment during subsequent spinning and use, effectively avoiding the loss of antistatic agent due to water rinsing, fabric friction, and detergent emulsification during washing. It significantly improves the bonding stability and wash fastness between the antistatic component and the polyester matrix, ensuring high stability and durability of the antistatic performance even after multiple washes.

[0016] Step S1 includes: S1.1. Dry the polyester chips at 125~135℃ for 6~8h to obtain pretreated chips.

[0017] Drying polyester chips at 125~135℃ removes adsorbed and residual water, effectively preventing hydrolysis and degradation of the polyester during subsequent high-temperature melting due to moisture. This also reduces the decrease in molecular weight and increase in end carboxyl content caused by ester bond breakage, thereby maintaining the integrity of the polyester molecular chain and the stability of melt viscosity.

[0018] S1.2 Add the pretreated slices and epoxy chain extender to the reactor and melt them at 265~275℃ and 180~250rpm for 20~30min. Then add the polyether antistatic agent and react at 265~275℃ and 180~250rpm for 20~30min to obtain the antistatic core layer melt. The mass ratio of pretreated slices: polyether antistatic agent: epoxy chain extender is 100:(5~12):(3~5).

[0019] The pretreated chips are first melt-reacted with an epoxy chain extender, and then a polyether-type antistatic agent is added to continue the reaction. This allows the epoxy chain extender to preferentially undergo ring-opening chain extension reactions with the carboxyl and hydroxyl groups at the ends of the polyester molecular chains, leaving some unreacted epoxy active sites on the polyester molecular chains. Subsequently, after adding the polyether-type antistatic agent, the hydroxyl groups on its molecular chains further undergo ring-opening grafting reactions with the remaining epoxy groups, thereby constructing a stable bridging covalent connection structure between the polyester molecular chains and the polyether-type antistatic agent. This avoids preferential self-reaction or local cross-linking between the polyether-type antistatic agent and the epoxy chain extender, improving the grafting efficiency and dispersion uniformity of the polyether-type antistatic agent.

[0020] S2. Melt polyester chips to obtain polyester skin melt, then composite spin the antistatic core melt and polyester skin melt to obtain composite polyester with an antistatic core layer and a polyester skin layer, wherein the thickness of the polyester skin layer is less than the thickness of the antistatic layer.

[0021] In step S2, the polyester chips include at least one of polyethylene terephthalate, polybutylene terephthalate, and polypropylene terephthalate.

[0022] A composite spinning process is employed, combining a polyester sheath melt and an antistatic core melt. This allows the antistatic layer to be continuously distributed within the composite polyester fiber, forming a complete encapsulation structure with the polyester sheath layer being thinner than the antistatic layer. On one hand, the polyester sheath layer acts as a protective layer, isolating the antistatic core layer containing polyether-based antistatic agents from the external washing environment. This reduces the direct effects of water rinsing, repeated fabric rubbing, and detergent emulsification on the antistatic components during washing, further inhibiting their migration, precipitation, and loss, thus improving the wash resistance stability of the antistatic core layer. On the other hand, because the polyester sheath layer is thinner than the antistatic layer, while ensuring continuous sheath coverage and fiber mechanical properties, the radial transmission distance from the fiber surface to the antistatic core layer is shortened. This allows static charges generated on the fiber surface to be more quickly transferred to the continuously distributed polyether antistatic network within the antistatic core layer for dissipation, preventing reduced electrostatic conduction efficiency due to an excessively thick sheath layer. Therefore, while maintaining the antistatic components' resistance to loss, the durability and stability of the antistatic performance are further improved.

[0023] Step S2 includes: S2.1. Dry the polyester chips at 120~140℃ for 6~8h to obtain dried chips, and then melt and plasticize the dried chips at 265~280℃ for 20~40min to obtain polyester skin melt.

[0024] Drying polyester chips at 120-140℃ before melt plasticizing can effectively remove adsorbed water and residual moisture from the polyester chips, prevent hydrolytic degradation of polyester during high-temperature melting, reduce ester bond breakage and molecular weight decrease, and maintain stable molecular weight and melt viscosity of the polyester skin melt.

[0025] Before proceeding to step S2.2, the method further includes: adjusting the viscosity of the polyester skin melt to be greater than the viscosity of the antistatic core melt.

[0026] The viscosity of the polyester sheath melt is adjusted to be greater than that of the antistatic core melt, so that the two melts form a reasonable flow resistance difference during the sheath-core composite spinning process. The polyester sheath melt with higher viscosity has stronger melt strength and interfacial stability, and can form a continuous, uniform and stable coating layer around the core melt, avoiding defects such as discontinuous coating, local thinning or core exposure caused by excessive fluidity of the sheath melt. At the same time, the antistatic core melt with lower viscosity is more likely to maintain stable flow during extrusion and fully fill the core channel, reducing interfacial fluctuations and flow instability. This ensures that the cross-section of the resulting composite fiber maintains a regular sheath-core structure and uniform sheath thickness, thereby enhancing the isolation and protection effect of the polyester sheath on the antistatic core layer.

[0027] The specific steps for adjusting the viscosity of the polyester skin melt to be greater than that of the antistatic core melt are as follows: Use a viscometer to test whether the viscosity of the polyester skin melt is greater than that of the antistatic core melt; If so, proceed to step S2.2; If not, use a viscosity modifier to adjust the viscosity of the polyester skin melt, and perform the step of using a viscometer to check whether the viscosity of the polyester skin melt is greater than the viscosity of the antistatic core melt; The viscosity modifier includes at least one of bisphenol A diglycidyl ether, trimethylolpropane triglycidyl ether, and pentaerythritol tetraglycidyl ether.

[0028] Bisphenol A diglycidyl ether, trimethylolpropane triglycidyl ether, and pentaerythritol tetraglycidyl ether in viscosity modifiers all contain two or more epoxy groups. In the polyester skin melt, they can undergo ring-opening reactions with the carboxyl and hydroxyl groups at the ends of the polyester molecular chains, connecting the originally independent polyester molecular chains to form longer molecular chains or long branched structures, thereby increasing the average molecular weight and the degree of molecular chain entanglement of the polyester molecular chains. As the molecular chain length increases and the inter-chain entanglement strengthens, the movement ability of the polyester molecular chains in the melt is restricted, the internal flow resistance of the melt increases, and thus the melt viscosity of the polyester skin melt gradually increases.

[0029] S2.2. Polyester sheath melt and antistatic core melt are composite spun and cooled at a mass flow ratio of (70~90):(10~30) to obtain composite nascent fiber. The diameter of the spinneret hole of the sheath-core composite spinneret is 0.30~0.36mm, and the diameter of the core flow channel is 70~90% of the diameter of the spinneret hole.

[0030] Polyester sheath melt and antistatic core melt are spun together at a mass flow ratio of (70~90):(10~30). The core melt is then extruded concentrically through a sheath-core composite spinneret with a core flow channel diameter that is 70%~90% of the spinneret diameter. This results in the antistatic core layer forming a continuous and stable main structure in the fiber cross section, while the polyester sheath forms a continuous and relatively thin coating layer around it.

[0031] S2.3. The composite nascent fiber is stretched and then heat-set at 160~190℃ for 20~60s to obtain a composite polyester with an antistatic core layer and a polyester skin layer. The stretching ratio is 2.5~4.5 times and the stretching temperature is 85~110℃.

[0032] The composite nascent fibers are stretched 2.5 to 4.5 times at 85 to 110°C to align the polyester molecular chains inside the fibers along the fiber axis, increasing the contact tightness between the polymer molecular chains of the sheath and core layers and promoting the entanglement of molecular chains in the interfacial region, thereby enhancing the interfacial bonding strength between the sheath and core layers. Subsequently, heat setting treatment is carried out at 160 to 190°C to stabilize and fix the orientation structure formed during the stretching process, while releasing residual stress inside the fibers, reducing the interfacial stress concentration caused by the difference in thermal shrinkage between the sheath and core layers, reducing the generation of microcracks, pores and delamination at the interface, and improving the stability of the composite polyester sheath-core structure.

[0033] S3. The composite polyester is spun and heat-set to obtain polyester fabric. Then, the polyester fabric is subjected to plasma activation treatment in an oxidizing atmosphere to obtain antistatic polyester dust-free fabric.

[0034] The oxidizing atmosphere in step S3 includes at least one of air, oxygen, a mixture of oxygen and argon, and a mixture of oxygen and nitrogen.

[0035] The fabric is made of composite polyester and heat-set, then subjected to plasma activation treatment in an oxidizing atmosphere. The active oxygen particles and oxygen free radicals generated by the plasma in the oxidizing atmosphere etch and activate the surface of the polyester skin, introducing oxygen-containing polar functional groups such as hydroxyl, carboxyl, and carbonyl groups onto the surface. This increases the surface energy and hydrophilicity of the polyester skin, making it easier for the fabric surface to absorb trace amounts of moisture from the environment and form a continuous conductive water film, providing a rapid migration channel for static charges. Simultaneously, because the antistatic components are covalently bonded within the antistatic core layer and continuously protected by the polyester skin, the plasma treatment only acts on the fiber surface without causing migration or loss of the antistatic components. Therefore, the conductive water film formed on the fiber surface and the internal antistatic core layer synergistically construct a continuous electrostatic dissipation path, enabling the rapid transfer of static charges from the surface to the core layer and continuous dissipation. Even after multiple washes, it maintains stable electrostatic discharge capability, further improving the washability, antistatic properties, and cleanliness of the antistatic polyester cleanroom fabric.

[0036] Step S3 includes: S3.1. The composite polyester is spun to obtain a grey fabric, and then the grey fabric is heat-set at 170~190℃ for 30~90s to obtain a polyester fabric.

[0037] By weaving composite polyester into a fabric and then heat-setting it at 170-190℃, the fiber bending, internal stress and dimensional instability caused during the weaving process can be effectively released, and the core-sheath structure of the composite polyester filament can be kept stable during the fabric processing. At the same time, the polyester molecular chains are further relaxed and rearranged during the heat-setting process, which fixes the fabric structure.

[0038] S3.2. Add the polyester fabric to the plasma treatment equipment and perform plasma activation treatment in an oxidizing atmosphere. Cool to room temperature to obtain antistatic polyester dust-free fabric. The plasma activation treatment pressure is 20~100Pa, the plasma activation treatment temperature is 25~60℃, the plasma activation treatment power is 100~500W, the oxidizing atmosphere gas flow rate is 20~80L / min, and the plasma activation treatment time is 30~180s.

[0039] Plasma activation treatment of polyester fabric under an oxidizing atmosphere can activate the surface of the polyester skin by utilizing high-energy active species such as active oxygen particles and oxygen free radicals generated during plasma discharge. Without destroying the composite polyester core-skin structure, some C-C bonds and C-H bonds on the surface of the polyester skin are broken, and oxygen-containing polar functional groups such as hydroxyl, carboxyl, and carbonyl groups are introduced, which improves the fiber surface energy and hydrophilicity, enhances the fiber surface's ability to adsorb water molecules, and forms a trace conductive hydration layer on the fiber surface that is conducive to electrostatic charge migration.

[0040] In addition, an antistatic polyester cleanroom fabric is proposed, which is prepared by the above-described method for preparing an antistatic polyester cleanroom fabric.

[0041] For example, the present invention provides the following specific embodiments to illustrate the specific preparation method: Example 1: S1.1. The polyethylene terephthalate slices were dried at 130°C for 7 hours to obtain pretreated slices; S1.2. The pretreated slices and trimethylolpropane triglycidyl ether were added to the reaction vessel and melted at 270°C and 220 rpm for 25 min. Then polyethylene glycol was added and reacted at 270°C and 220 rpm for 25 min to obtain an antistatic core layer melt with a viscosity of 503 Pa·s. The mass ratio of pretreated slices: polyethylene glycol: trimethylolpropane triglycidyl ether was 100:8:4. S2.1. The polyethylene terephthalate chips were dried at 130°C for 7 hours to obtain dried chips. Then the dried chips were melted and plasticized at 270°C for 30 minutes to obtain a polyester skin melt with a viscosity of 358 Pa·s. Among them, trimethylolpropane triglycidyl ether was used to adjust the viscosity of the polyester skin melt to 611 Pa·s; S2.2 The polyester sheath melt and antistatic core melt, after viscosity adjustment, are composite spun and cooled at a mass flow ratio of 80:20 to obtain composite nascent fibers. The spinneret diameter of the sheath-core composite spinneret is 0.33 mm, and the core flow channel diameter is 80% of the spinneret diameter. S2.3. The composite nascent fiber is stretched and then heat-set at 175℃ for 40s to obtain a composite polyester with an antistatic core layer and a polyester skin layer. The stretching ratio is 3.5 times and the stretching temperature is 95℃. S3.1. The composite polyester is spun to obtain a grey fabric, and then the grey fabric is heat-set at 180℃ for 60s to obtain a polyester fabric. S3.2. Add the polyester fabric to the plasma treatment equipment and perform plasma activation treatment in an air atmosphere. Cool to room temperature to obtain antistatic polyester dust-free fabric. The plasma activation treatment pressure is 60Pa, the plasma activation treatment temperature is 45℃, the plasma activation treatment power is 300W, the oxidizing atmosphere gas flow rate is 50L / min, and the plasma activation treatment time is 100s.

[0042] Example 2: S1.1. The polyethylene terephthalate slices were dried at 130°C for 7 hours to obtain pretreated slices; S1.2. The pretreated slices and trimethylolpropane triglycidyl ether were added to the reaction vessel and reacted at 270°C and 220 rpm for 25 min. Then polyethylene glycol was added and reacted at 270°C and 220 rpm for 25 min to obtain an antistatic core layer melt with a viscosity of 512 Pa·s. The mass ratio of pretreated slices: polyethylene glycol: trimethylolpropane triglycidyl ether was 100:8:4. S2.1. The polyethylene terephthalate chips were dried at 130°C for 7 hours to obtain dried chips. Then the dried chips were melted and plasticized at 270°C for 30 minutes to obtain a polyester skin melt with a viscosity of 350 Pa·s. Among them, trimethylolpropane triglycidyl ether was used to adjust the viscosity of the polyester skin melt to 607 Pa·s; S2.2 The polyester sheath melt and antistatic core melt, after viscosity adjustment, are composite spun and cooled at a mass flow ratio of 70:30 to obtain composite nascent fibers. The spinneret diameter of the sheath-core composite spinneret is 0.33 mm, and the core flow channel diameter is 70% of the spinneret diameter. S2.3. The composite nascent fiber is stretched and then heat-set at 175℃ for 40s to obtain a composite polyester with an antistatic core layer and a polyester skin layer. The stretching ratio is 3.5 times and the stretching temperature is 95℃. S3.1. The composite polyester is spun to obtain a grey fabric, and then the grey fabric is heat-set at 180℃ for 60s to obtain a polyester fabric. S3.2. Add the polyester fabric to the plasma treatment equipment and perform plasma activation treatment in an air atmosphere. Cool to room temperature to obtain antistatic polyester dust-free fabric. The plasma activation treatment pressure is 60Pa, the plasma activation treatment temperature is 45℃, the plasma activation treatment power is 300W, the oxidizing atmosphere gas flow rate is 50L / min, and the plasma activation treatment time is 100s.

[0043] The process is basically the same as in Example 1, except that in step S2.2, the mass flow ratio of the polyester skin melt to the antistatic core melt is 70:30, and the core channel diameter is 70% of the spinneret diameter.

[0044] Example 3: S1.1. The polyethylene terephthalate slices were dried at 130°C for 7 hours to obtain pretreated slices; S1.2. The pretreated slices and trimethylolpropane triglycidyl ether were added to the reaction vessel and melted at 270°C and 220 rpm for 25 min. Then polyethylene glycol was added and reacted at 270°C and 220 rpm for 25 min to obtain an antistatic core melt with a viscosity of 499 Pa·s. The mass ratio of pretreated slices: polyethylene glycol: trimethylolpropane triglycidyl ether was 100:8:4. S2.1. The polyethylene terephthalate chips were dried at 130°C for 7 hours to obtain dried chips. Then the dried chips were melted and plasticized at 270°C for 30 minutes to obtain a polyester skin melt with a viscosity of 361 Pa·s. Among them, trimethylolpropane triglycidyl ether was used to adjust the viscosity of the polyester skin melt to 605 Pa·s; S2.2 The polyester sheath melt and antistatic core melt, after viscosity adjustment, are combined and spun at a mass flow ratio of 90:10 and cooled to obtain composite nascent fibers. The spinneret diameter of the sheath-core composite spinneret is 0.33 mm, and the core flow channel diameter is 90% of the spinneret diameter. S2.3. The composite nascent fiber is stretched and then heat-set at 175℃ for 40s to obtain a composite polyester with an antistatic core layer and a polyester skin layer. The stretching ratio is 3.5 times and the stretching temperature is 95℃. S3.1. The composite polyester is spun to obtain a grey fabric, and then the grey fabric is heat-set at 180℃ for 60s to obtain a polyester fabric. S3.2. Add the polyester fabric to the plasma treatment equipment and perform plasma activation treatment in an air atmosphere. Cool to room temperature to obtain antistatic polyester dust-free fabric. The plasma activation treatment pressure is 60Pa, the plasma activation treatment temperature is 45℃, the plasma activation treatment power is 300W, the oxidizing atmosphere gas flow rate is 50L / min, and the plasma activation treatment time is 100s.

[0045] The process is basically the same as in Example 1, except that in step S2.2, the mass flow ratio of the polyester skin melt to the antistatic core melt is 90:10, and the core channel diameter is 90% of the spinneret diameter.

[0046] Comparative Example 1: S1.1. The polyethylene terephthalate slices were dried at 130°C for 7 hours to obtain pretreated slices; S1.2. The pretreated slices and trimethylolpropane triglycidyl ether were added to the reaction vessel and melted at 270°C and 220 rpm for 25 min. Then polyethylene glycol was added and reacted at 270°C and 220 rpm for 25 min to obtain an antistatic core layer melt with a viscosity of 503 Pa·s. The mass ratio of pretreated slices: polyethylene glycol: trimethylolpropane triglycidyl ether was 100:8:4. S2.1. The polyethylene terephthalate chips were dried at 130°C for 7 hours to obtain dried chips. Then the dried chips were melted and plasticized at 270°C for 30 minutes to obtain a polyester skin melt with a viscosity of 358 Pa·s. S2.2. Polyester sheath melt and antistatic core melt are composite spun and cooled at a mass flow ratio of 80:20 to obtain composite nascent fiber. The spinneret diameter of the sheath-core composite spinneret is 0.33 mm, and the core flow channel diameter is 80% of the spinneret diameter. S2.3. The composite nascent fiber is stretched and then heat-set at 175℃ for 40s to obtain a composite polyester with an antistatic core layer and a polyester skin layer. The stretching ratio is 3.5 times and the stretching temperature is 95℃. S3.1. The composite polyester is spun to obtain a grey fabric, and then the grey fabric is heat-set at 180℃ for 60s to obtain a polyester fabric. S3.2. Add the polyester fabric to the plasma treatment equipment and perform plasma activation treatment in an air atmosphere. Cool to room temperature to obtain antistatic polyester dust-free fabric. The plasma activation treatment pressure is 60Pa, the plasma activation treatment temperature is 45℃, the plasma activation treatment power is 300W, the oxidizing atmosphere gas flow rate is 50L / min, and the plasma activation treatment time is 100s.

[0047] It is basically the same as Example 1, except that the viscosity of the polyester skin melt in step S2.2 is less than the viscosity of the antistatic core melt.

[0048] Comparative Example 2: S1.1. The polyethylene terephthalate slices were dried at 130°C for 7 hours to obtain pretreated slices; S1.2 Add the pretreated chips and polyethylene glycol to the reactor and melt them at 270°C and 220 rpm for 30 min to obtain an antistatic core layer melt with a viscosity of 315 Pa·s. The mass ratio of pretreated chips to polyethylene glycol is 100:8. S2.1. The polyethylene terephthalate chips were dried at 130°C for 7 hours to obtain dried chips. Then the dried chips were melted and plasticized at 270°C for 30 minutes to obtain a polyester skin melt with a viscosity of 358 Pa·s. S2.2. Polyester sheath melt and antistatic core melt are composite spun and cooled at a mass flow ratio of 80:20 to obtain composite nascent fiber. The spinneret diameter of the sheath-core composite spinneret is 0.33 mm, and the core flow channel diameter is 80% of the spinneret diameter. S2.3. The composite nascent fiber is stretched and then heat-set at 175℃ for 40s to obtain a composite polyester with an antistatic core layer and a polyester skin layer. The stretching ratio is 3.5 times and the stretching temperature is 95℃. S3.1. The composite polyester is spun to obtain a grey fabric, and then the grey fabric is heat-set at 180℃ for 60s to obtain a polyester fabric. S3.2. Add the polyester fabric to the plasma treatment equipment and perform plasma activation treatment in an air atmosphere. Cool to room temperature to obtain antistatic polyester dust-free fabric. The plasma activation treatment pressure is 60Pa, the plasma activation treatment temperature is 45℃, the plasma activation treatment power is 300W, the oxidizing atmosphere gas flow rate is 50L / min, and the plasma activation treatment time is 100s.

[0049] It is basically the same as Example 1, except that trimethylolpropane triglycidyl ether is not used in step S1.2, that is, epoxy chain extender is not used in step S1.

[0050] Comparative Example 3: S1.1. The polyethylene terephthalate slices were dried at 130°C for 7 hours to obtain pretreated slices; S1.2. The pretreated slices and trimethylolpropane triglycidyl ether were added to the reaction vessel and reacted at 270°C and 220 rpm for 25 min. Then polyethylene glycol was added and reacted at 270°C and 220 rpm for 25 min to obtain an antistatic core layer melt with a viscosity of 505 Pa·s. The mass ratio of pretreated slices: polyethylene glycol: trimethylolpropane triglycidyl ether was 100:8:4. S2.1. The polyethylene terephthalate chips were dried at 130°C for 7 hours to obtain dried chips. Then the dried chips were melted and plasticized at 270°C for 30 minutes to obtain a polyester skin melt with a viscosity of 355 Pa·s. Among them, trimethylolpropane triglycidyl ether was used to adjust the viscosity of the polyester skin melt to 606 Pa·s; S2.2 The polyester sheath melt and antistatic core melt, after viscosity adjustment, are composite spun and cooled at a mass flow ratio of 50:50 to obtain composite nascent fibers. The spinneret diameter of the sheath-core composite spinneret is 0.33 mm, and the core flow channel diameter is 50% of the spinneret diameter. S2.3. The composite nascent fiber is stretched and then heat-set at 175℃ for 40s to obtain a composite polyester with an antistatic core layer and a polyester skin layer. The stretching ratio is 3.5 times and the stretching temperature is 95℃. S3.1. The composite polyester is spun to obtain a grey fabric, and then the grey fabric is heat-set at 180℃ for 60s to obtain a polyester fabric. S3.2. Add the polyester fabric to the plasma treatment equipment and perform plasma activation treatment in an air atmosphere. Cool to room temperature to obtain antistatic polyester dust-free fabric. The plasma activation treatment pressure is 60Pa, the plasma activation treatment temperature is 45℃, the plasma activation treatment power is 300W, the oxidizing atmosphere gas flow rate is 50L / min, and the plasma activation treatment time is 100s.

[0051] The process is basically the same as in Example 1, except that in step S2.2, the mass flow ratio of the polyester skin melt to the antistatic core melt is 50:50, and the core channel diameter is 50% of the spinneret diameter.

[0052] Comparative Example 4: S1.1. The polyethylene terephthalate slices were dried at 130°C for 7 hours to obtain pretreated slices; S1.2. The pretreated slices and trimethylolpropane triglycidyl ether were added to the reaction vessel and melted at 270°C and 220 rpm for 25 min. Then polyethylene glycol was added and reacted at 270°C and 220 rpm for 25 min to obtain an antistatic core layer melt with a viscosity of 501 Pa·s. The mass ratio of pretreated slices: polyethylene glycol: trimethylolpropane triglycidyl ether was 100:8:4. S2.1. The polyethylene terephthalate chips were dried at 130°C for 7 hours to obtain dried chips. Then the dried chips were melted and plasticized at 270°C for 30 minutes to obtain a polyester skin melt with a viscosity of 359 Pa·s. Among them, trimethylolpropane triglycidyl ether was used to adjust the viscosity of the polyester skin melt to 601 Pa·s; S2.2 The polyester sheath melt and antistatic core melt, after viscosity adjustment, are composite spun and cooled at a mass flow ratio of 40:60 to obtain composite nascent fibers. The spinneret diameter of the sheath-core composite spinneret is 0.33 mm, and the core flow channel diameter is 40% of the spinneret diameter. S2.3. The composite nascent fiber is stretched and then heat-set at 175℃ for 40s to obtain a composite polyester with an antistatic core layer and a polyester skin layer. The stretching ratio is 3.5 times and the stretching temperature is 95℃. S3.1. The composite polyester is spun to obtain a grey fabric, and then the grey fabric is heat-set at 180℃ for 60s to obtain a polyester fabric. S3.2. Add the polyester fabric to the plasma treatment equipment and perform plasma activation treatment in an air atmosphere. Cool to room temperature to obtain antistatic polyester dust-free fabric. The plasma activation treatment pressure is 60Pa, the plasma activation treatment temperature is 45℃, the plasma activation treatment power is 300W, the oxidizing atmosphere gas flow rate is 50L / min, and the plasma activation treatment time is 100s.

[0053] The process is basically the same as in Example 1, except that in step S2.2, the mass flow ratio of the polyester skin melt to the antistatic core melt is 40:60, and the core flow channel diameter is 40% of the spinneret diameter.

[0054] Comparative Example 5: S1.1. The polyethylene terephthalate slices were dried at 130°C for 7 hours to obtain pretreated slices; S1.2. The pretreated slices and trimethylolpropane triglycidyl ether were added to the reaction vessel and melted at 270°C and 220 rpm for 25 min. Then polyethylene glycol was added and reacted at 270°C and 220 rpm for 25 min to obtain an antistatic core layer melt with a viscosity of 503 Pa·s. The mass ratio of pretreated slices: polyethylene glycol: trimethylolpropane triglycidyl ether was 100:8:4. S2.1. The polyethylene terephthalate chips were dried at 130°C for 7 hours to obtain dried chips. Then the dried chips were melted and plasticized at 270°C for 30 minutes to obtain a polyester skin melt with a viscosity of 355 Pa·s. Among them, trimethylolpropane triglycidyl ether was used to adjust the viscosity of the polyester skin melt to 610 Pa·s; S2.2 The polyester sheath melt and antistatic core melt, after viscosity adjustment, are composite spun and cooled at a mass flow ratio of 80:20 to obtain composite nascent fibers. The spinneret diameter of the sheath-core composite spinneret is 0.33 mm, and the core flow channel diameter is 80% of the spinneret diameter. S2.3. The composite nascent fiber is stretched and then heat-set at 175℃ for 40s to obtain a composite polyester with an antistatic core layer and a polyester skin layer. The stretching ratio is 3.5 times and the stretching temperature is 95℃. S3. The composite polyester is spun to obtain a greige fabric, and then the greige fabric is heat-set at 180℃ for 60s to obtain an antistatic polyester dust-free fabric.

[0055] It is basically the same as Example 1, except that the fabric is not subjected to plasma activation treatment in step S3.

[0056] Performance testing: Surface resistivity: Refer to national standard GB / T12703.4 2010 "Evaluation of electrostatic properties of textiles - Part 4: Resistivity", Example 1 3 and Comparative Example 1 5. The antistatic polyester dust-free fabric was subjected to a washing test: The washing conditions were as follows: the fabric (50cm×50cm) was soaked in 500mL of soapy water (each liter of soap contained 5g of soap), and then rotated and washed at 1000r / min for 10min. After washing, it was dried. This was considered one washing cycle. The surface resistance was measured before washing, after 10 washing cycles, and after 20 washing cycles.

[0057] The test data is shown in Table 1.

[0058] Table 1 Performance Tests of Antistatic Polyester Cleanroom Fabric: As shown in Table 1, the antistatic polyester dust-free fabrics prepared in Examples 1-3 still maintained a surface resistance of 10 ohms after 20 washes. 7 The surface resistance was on the order of Ω, about 6 orders of magnitude lower than that of commercially available ordinary polyester fabric, and the change before and after washing was small. Among them, Example 1 showed the best performance. In Comparative Example 1, since the viscosity of the skin layer was less than that of the core layer, the surface resistance of both was similar before washing compared to Example 1. However, after 20 washes, the surface resistance of Comparative Example 1 changed more significantly. In Comparative Example 2, since no epoxy chain extender was added and PEG existed only in a physical blending manner, the surface resistance increased most significantly after 20 washes. In Comparative Examples 3-4, since the skin layer thickness was greater than the core layer thickness, although the increase in surface resistance after washing was small, the base resistance (before washing) was higher. Finally, Comparative Example 5 was observed to have significantly increased surface resistance both initially and after washing because it did not undergo plasma activation treatment and lacked auxiliary electrostatic leakage channels formed by surface polar functional groups.

[0059] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the following claims.

Claims

1. A method for preparing an antistatic polyester dust-free fabric, characterized in that, The preparation method includes the following steps: S1. Polyether-type antistatic agent, epoxy chain extender and polyester chips are mixed and melted to obtain antistatic core layer melt, wherein the polyether-type antistatic agent contains hydroxyl groups; S2. Melt polyester chips to obtain polyester skin melt, then composite spin antistatic core melt and polyester skin melt to obtain composite polyester with antistatic core and polyester skin, wherein the thickness of polyester skin is less than the thickness of antistatic layer. S3. The composite polyester is spun and heat-set to obtain polyester fabric. Then, the polyester fabric is subjected to plasma activation treatment in an oxidizing atmosphere to obtain antistatic polyester dust-free fabric.

2. The method for preparing an antistatic polyester dust-free fabric according to claim 1, characterized in that, In step S1, the polyether-type antistatic agent includes at least one of polyethylene glycol, polytetrahydrofuran glycol, and polypropylene glycol; the polyester chips include at least one of polyethylene terephthalate, polybutylene terephthalate, and polypropylene terephthalate; and the epoxy chain extender includes at least one of polyethylene glycol diglycidyl ether, trimethylolpropane triglycidyl ether, and pentaerythritol tetraglycidyl ether.

3. The method for preparing an antistatic polyester dust-free fabric according to claim 2, characterized in that, Step S1 includes: S1.

1. Dry the polyester chips at 125~135℃ for 6~8h to obtain pretreated chips; S1.2 Add the pretreated slices and epoxy chain extender to the reactor and melt them at 265~275℃ and 180~250rpm for 20~30min. Then add the polyether antistatic agent and react at 265~275℃ and 180~250rpm for 20~30min to obtain the antistatic core layer melt. The mass ratio of pretreated slices: polyether antistatic agent: epoxy chain extender is 100:(5~12):(3~5).

4. The method for preparing an antistatic polyester dust-free fabric according to claim 1, characterized in that, In step S2, the polyester chips include at least one of polyethylene terephthalate, polybutylene terephthalate, and polypropylene terephthalate.

5. The method for preparing an antistatic polyester dust-free fabric according to claim 4, characterized in that, Step S2 includes: S2.

1. Dry the polyester chips at 120~140℃ for 6~8h to obtain dried chips, and then melt and plasticize the dried chips at 265~280℃ for 20~40min to obtain polyester skin melt. S2.

2. Polyester sheath melt and antistatic core melt are composite spun and cooled at a mass flow ratio of (70~90):(10~30) to obtain composite nascent fiber. The spinneret diameter of the sheath-core composite spinneret is 0.30~0.36mm, and the core flow channel diameter is 70~90% of the spinneret diameter. S2.

3. The composite nascent fiber is stretched and then heat-set at 160~190℃ for 20~60s to obtain a composite polyester with an antistatic core layer and a polyester skin layer. The stretching ratio is 2.5~4.5 times and the stretching temperature is 85~110℃.

6. The method for preparing an antistatic polyester dust-free fabric according to claim 5, characterized in that, Before proceeding to step S2.2, the method further includes: adjusting the viscosity of the polyester skin melt to be greater than the viscosity of the antistatic core melt.

7. The method for preparing an antistatic polyester dust-free fabric according to claim 6, characterized in that, The specific steps for adjusting the viscosity of the polyester skin melt to be greater than that of the antistatic core melt are as follows: Use a viscometer to test whether the viscosity of the polyester skin melt is greater than that of the antistatic core melt; If so, proceed to step S2.2; If not, use a viscosity modifier to adjust the viscosity of the polyester skin melt, and perform the step of using a viscometer to check whether the viscosity of the polyester skin melt is greater than the viscosity of the antistatic core melt; The viscosity modifier includes at least one of bisphenol A diglycidyl ether, trimethylolpropane triglycidyl ether, and pentaerythritol tetraglycidyl ether.

8. The method for preparing an antistatic polyester dust-free fabric according to claim 1, characterized in that, The oxidizing atmosphere in step S3 includes at least one of air, oxygen, a mixture of oxygen and argon, and a mixture of oxygen and nitrogen.

9. The method for preparing an antistatic polyester dust-free fabric according to claim 8, characterized in that, Step S3 includes: S3.

1. The composite polyester is spun to obtain a grey fabric, and then the grey fabric is heat-set at 170~190℃ for 30~90s to obtain a polyester fabric. S3.

2. Add the polyester fabric to the plasma treatment equipment and perform plasma activation treatment in an oxidizing atmosphere. Cool to room temperature to obtain antistatic polyester dust-free fabric. The plasma activation treatment pressure is 20~100Pa, the plasma activation treatment temperature is 25~60℃, the plasma activation treatment power is 100~500W, the oxidizing atmosphere gas flow rate is 20~80L / min, and the plasma activation treatment time is 30~180s.

10. An antistatic polyester dust-free fabric, characterized in that, The antistatic polyester cleanroom fabric is prepared by any one of the preparation methods of antistatic polyester cleanroom fabric according to claims 1-9.

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