Environment-friendly base cloth based on regenerated fibers and preparation method of environment-friendly base cloth

Abstract

The invention relates to environment-friendly base cloth based on regenerated fibers and a preparation method of the environment-friendly base cloth, and relates to the technical field of textile materials.The environment-friendly base cloth is prepared from, by mass, 50-70 parts of regenerated polyester fibers and 30-50 parts of cotton fibers; the regenerated polyester fiber is prepared by the following steps: crushing regenerated polyester, mixing with poly (butylene succinate), drying, melting and plasticizing, adding a chain extender, reacting, extruding, and dicing to obtain blended particles; the blended particles are subjected to spinning extrusion, cooling solidification and winding to form filaments, and the regenerated polyester fibers are obtained; the preparation raw materials further comprise an after-finishing agent, an antistatic agent and a penetrant. The preparation method comprises the following steps that regenerated polyester fibers and cotton fibers are subjected to mixed opening, carding, drawing and net forming, a fiber net is obtained, pre-wetting treatment, needling reinforcement, shaping treatment and after-treatment are conducted, and the environment-friendly base cloth based on the regenerated fibers is obtained. The method has the effect of improving the tensile property and wear resistance of the regenerated fiber environment-friendly base cloth.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of textile materials, in particular to an environment-friendly base cloth based on regenerated fibers and a preparation method thereof. BACKGROUND

[0002] With the increasing awareness of environmental protection worldwide, regenerated fibers have become an important way to reduce resource consumption and waste, which is particularly evident in the textile industry. The application of regenerated fibers not only helps to alleviate the situation of resource shortage, but also reduces the pressure on the environment caused by textile waste, so it is increasingly valued in the textile industry. At the same time, regenerated fibers also promote the development of the textile industry in a more sustainable and environmentally friendly direction, prompting enterprises to continuously explore how to better use regenerated fibers to develop new products. In this context, the environment-friendly base cloth based on regenerated fibers emerged as the times require, which not only conforms to the concept of environmental protection, but also meets certain market demand.

[0003] In order to prepare the environment-friendly base cloth based on regenerated fibers, the industry usually uses polyester, nylon and other regenerated fibers as raw materials, and completes it through a series of processes such as spinning and weaving. The spinning process is to convert regenerated fiber raw materials into fiber yarns, so that they have a certain fineness and strength; and the weaving process is to weave these fiber yarns into a cloth structure. In addition, in order to improve the performance of the regenerated fiber environment-friendly base cloth, the industry has also tried various means. For example, by blending different types of regenerated fibers, it is expected to complement the characteristics of different fibers to improve the overall performance of the base cloth; or by adding special treatment agents, trying to enhance certain specific properties of the base cloth.

[0004] However, these existing technical means have obvious defects. Although the environment-friendly base cloth based on regenerated fibers has good environmental friendliness, its performance is often not as good as that of virgin fiber products, especially in terms of strength and wear resistance, which greatly limits its application in high-end markets. Moreover, the method of blending different types of regenerated fibers or adding special treatment agents to improve performance not only increases production costs, but also has very limited actual effect, and cannot fundamentally solve the contradiction between performance and environmental protection, so it needs to be improved. SUMMARY

[0005] In order to improve the performance of the environment-friendly base cloth based on regenerated fibers, the present application provides an environment-friendly base cloth based on regenerated fibers and a preparation method thereof.

[0006] The environment-friendly base cloth based on regenerated fibers and the preparation method thereof provided by the present application adopt the following technical solutions: In a first aspect, the present application provides an environment-friendly base cloth based on regenerated fibers, which adopts the following technical solutions: An environment-friendly base cloth based on regenerated fibers, the preparation raw material comprises the following components in mass fraction: 50-70 parts recycled polyester fiber 30-50 parts cotton fiber; The recycled polyester fiber is prepared using the following steps: The recycled polyester is crushed, mixed with polybutylene succinate and dried, melt-plasticized, and a chain extender is added. After reaction, it is extruded and pelletized to obtain blended particles. The blended particles are spun and extruded, cooled and solidified, and wound into filaments to obtain recycled polyester fibers. The raw materials used in the preparation also include finishing agents, antistatic agents, and penetrants.

[0007] The introduction of polybutylene succinate (PBS) improves the brittleness of recycled polyester and enhances fiber toughness through its flexible aliphatic chain structure. Simultaneously, its biodegradable properties endow the base fabric with environmental friendliness. Chain extenders simultaneously repair molecular chain breakage defects in recycled polyester during melt plasticization and react with the terminal hydroxyl groups of PBS to form chemical bridges, strengthening the interfacial bonding between the two phases. The synergistic effect of these three components not only enhances the mechanical stability and melt spinnability of the fibers but also provides a compatible basis for cotton fiber blending. When recycled polyester fibers are blended with cotton fibers, a penetrant promotes two-phase wetting and improves fiber bonding tightness, while the introduction of finishing agents and antistatic agents further enhances the performance of the base fabric. The various components work together synergistically to improve the tensile and abrasion resistance of the recycled fiber environmentally friendly base fabric.

[0008] Preferably, the mass ratio of the recycled polyester, polybutylene succinate, and chain extender is 1:0.25:(0.004-0.006).

[0009] The recycled polyester fibers prepared according to the above mass ratio have good tensile properties and abrasion resistance.

[0010] Preferably, the chain extender comprises methyl 3,4-epoxycyclohexyl methacrylate.

[0011] During the melt plasticizing stage, the alicyclic epoxy groups of 3,4-epoxycyclohexyl methyl methacrylate undergo a ring-opening reaction with the carboxyl groups at the fracture ends of recycled polyester, effectively repairing the molecular chain and improving crystal integrity, thereby enhancing the tensile strength of the fiber body. At the same time, the rigid alicyclic structure of this chain extender forms an interpenetrating entanglement with the flexible segments of polybutylene succinate, constructing a tough network in the interfacial region and reducing microcracks caused by stress concentration. When the chain-extended recycled polyester fiber is blended with cotton fiber, the improved molecular chain regularity reduces inter-fiber friction loss and synergistically enhances the wear resistance of the base fabric.

[0012] Preferably, the modified methyl methacrylate-3,4-epoxycyclohexyl methacrylate is prepared by the following steps: methyl methacrylate-3,4-epoxycyclohexyl methacrylate and N-phenylmaleimide are added to a solvent, an initiator is added, and the reaction is heated and stirred under a protective atmosphere. After cooling, the reaction is terminated, and the mixture is filtered, washed, and dried to obtain the modified chain extender.

[0013] The rigid imide ring of N-phenylmaleimide and the alicyclic epoxy group of 3,4-epoxycyclohexyl methyl methacrylate are copolymerized in a solvent to form a network structure with both high reactivity and steric stability. During the melt plasticizing stage, this modified chain extender efficiently bridges the broken molecular chains of recycled polyester through epoxy groups. At the same time, the strong polarity of the imide ring enhances the entanglement density of the flexible segments of polybutylene succinate, forming a rigid-tough synergistic transition layer in the interfacial region. The extended fiber bulk exhibits improved crystallinity regularity and increased molecular chain slip resistance, giving the base fabric higher tensile deformation resistance. Meanwhile, the rigid network's support for the fiber surface reduces the wear and shedding of cotton fibers in blended fabrics, synergistically improving the overall abrasion resistance of the base fabric.

[0014] Preferably, the mass ratio of methyl methacrylate-3,4-epoxycyclohexyl methacrylate to N-phenylmaleimide is 1:(0.8-1).

[0015] The modified chain extender prepared according to the above mass ratio can effectively improve the tensile properties and abrasion resistance of environmentally friendly base fabric.

[0016] Preferably, the finishing agent comprises octadecyldimethyl (trimethoxysilylpropyl)ammonium chloride.

[0017] The trimethoxysilane structure of octadecyldimethyl(trimethoxysilylpropyl)ammonium chloride undergoes hydrolysis and condensation during finishing, forming a covalent network with the ester groups of recycled polyester fibers and the hydroxyl groups of cotton fibers. This creates rigid cross-linking nodes at fiber intersections, enhancing the structural stability of the nonwoven fabric skeleton. Simultaneously, long-chain alkyl groups are oriented on the fiber surface to form a hydrophobic lubricating layer, reducing shear stress during friction. Meanwhile, quaternary ammonium cations are anchored to fiber defect sites through electrostatic interaction, inhibiting microcrack propagation. This synergistic effect of chemical bonding and physical shielding enhances the tensile and abrasion resistance of the base fabric.

[0018] Secondly, this application provides a method for preparing an environmentally friendly base fabric based on recycled fibers, using the following technical solution: A method for preparing an environmentally friendly base fabric based on recycled fibers includes the following steps: S1. Mix, open, comb, draw, and form a web of recycled polyester fiber and cotton fiber to obtain a fiber web; S2. After pre-wetting the fiber web and reinforcing it with needle punch, a preliminary nonwoven fabric is obtained. S3. The initial nonwoven fabric is shaped to obtain a nonwoven fabric; S4. The nonwoven fabric is post-treated with a working solution containing a finishing agent to obtain an environmentally friendly base fabric based on recycled fibers.

[0019] The opening and combing process promotes the formation of a uniformly dispersed network structure between recycled polyester fibers and cotton fibers, providing a foundation for subsequent mechanical entanglement. The pre-wetting treatment activates polar groups on the fiber surface through moisture, enhancing the hydrogen bonding and physical connection between fibers during needle punching, and constructing a three-dimensional skeleton resistant to deformation. In the step-setting process, thermal stress release and molecular chain rearrangement synergistically improve the density of the nonwoven fabric structure and inhibit fiber slippage. The finishing agent, under the action of the working fluid, coats the fiber cross nodes and forms a flexible buffer layer at the interface, which not only disperses tensile stress but also reduces frictional damage, thus synergistically strengthening the tensile fracture resistance and abrasion resistance of the base fabric at the fiber network level.

[0020] Preferably, the pre-wetting treatment in step S2 uses a pre-wetting solution, which includes an antistatic agent and a penetrant. The pre-wetting conditions are a temperature of 35-45°C, a roll residue of 80-90%, and a moisture content of 20-30% after pre-wetting.

[0021] Under the aforementioned pre-wetting conditions, the pre-wetting solution reduces the surface tension of the fibers through the penetrant, promoting the uniform coating of the antistatic agent on the surfaces of the recycled polyester and cotton fibers, neutralizing the triboelectric charge, and reducing electrostatic repulsion during fiber dispersion. The plasticizing effect of water molecules softens the fiber interface layer, enhances the mechanical entanglement and hydrogen bond density between fibers during needle punching, and constructs a three-dimensional network resistant to deformation. The moderately moist environment forms temporary hydration bridges under hot rolling, guiding the fiber orientation and reducing puncture damage, providing a densification basis for subsequent shaping, and simultaneously improving the service performance of the base fabric against tensile fracture and frictional wear.

[0022] Preferably, the shaping treatment in step S3 is performed at 170-190℃ for 80-100 seconds followed by air cooling.

[0023] Under the aforementioned shaping conditions, the molecular chain segments of recycled polyester fibers acquire moderate mobility, eliminating internal stress and improving crystal regularity through chain relaxation. Simultaneously, the flexible segments of polybutylene succinate penetrate into the polyester fibers to form an entangled buffer layer. The hydroxyl groups of cotton fibers are activated in a humid and hot environment, enhancing their bonding with the polar groups on the surface of recycled polyester fibers. The air-cooling process controls the cooling rate, allowing the molecular chains to rearrange in an orderly manner to form a stable crystalline structure, reducing microcracks caused by differences in fiber shrinkage. The above processes enhance the inter-fiber bonding force and the ability to disperse interfacial stress, thereby improving the tensile properties and abrasion resistance of the base fabric.

[0024] Preferably, in step S4, the working solution includes 30-50 g / L finishing agent and 1-2 g / L penetrant, with a pH of 5-5.5. During finishing, the process involves two dips and two nips, with a dip and nips temperature of 20-30°C, a nips ratio of 70-80%, pre-drying at 100-110°C for 1.5-2.5 min, and baking at 150-160°C for 1-2 min.

[0025] The weakly acidic working fluid environment, combined with the penetrant, reduces the surface tension of the fibers, promoting the uniform coating of the finishing agent on the cross-nodes of the recycled polyester and cotton fibers. Low-temperature padding reduces phase separation caused by differences in the thermal motion of molecular chains, allowing the finishing agent to be initially anchored at the fiber interface. The pre-drying stage forms a continuous film skeleton through gentle dehydration, strengthening the bonding points between fibers. High-temperature baking activates the cross-linking reaction, constructing a three-dimensional network structure on the fiber surface. Through the dual effects of chemical bonding and physical entanglement, the bonding force between fibers is enhanced, forming a flexible-rigid synergistic interface layer, thereby improving the tensile and abrasion resistance of the base fabric.

[0026] In summary, this application includes at least one of the following beneficial technical effects: 1. The introduction of polybutylene succinate (PBS) improves the brittleness of recycled polyester and enhances fiber toughness through its flexible aliphatic chain structure. Simultaneously, its biodegradable properties endow the base fabric with environmental friendliness. Chain extenders simultaneously repair molecular chain breakage defects in recycled polyester during melt plasticization and react with the terminal hydroxyl groups of PBS to form chemical bridges, strengthening the interfacial bonding between the two phases. The synergistic effect of these three components not only enhances the mechanical stability and melt spinnability of the fibers but also provides a compatible basis for cotton fiber blending. When recycled polyester fibers are blended with cotton fibers, penetrants promote two-phase wetting and improve fiber bonding tightness, while the introduction of finishing agents and antistatic agents further enhances the performance of the base fabric. The various components work together synergistically to improve the tensile properties and weather resistance of the recycled fiber environmentally friendly base fabric.

[0027] 2. The alicyclic epoxy groups of methyl methacrylate-3,4-epoxycyclohexyl methyl ester undergo a ring-opening reaction with the broken carboxyl groups of recycled polyester during the melt plasticizing stage, effectively repairing the molecular chain and improving crystal integrity, thereby enhancing the tensile strength of the fiber body. At the same time, the rigid alicyclic structure of this chain extender forms an interpenetrating entanglement with the flexible segments of polybutylene succinate, constructing a tough network in the interfacial region and reducing microcracks caused by stress concentration. When the chain-extended recycled polyester fiber is blended with cotton fiber, the improved molecular chain regularity reduces inter-fiber friction loss and synergistically enhances the wear resistance of the base fabric.

[0028] 3. The rigid imide ring of N-phenylmaleimide and the alicyclic epoxy group of 3,4-epoxycyclohexyl methyl methacrylate are copolymerized in a solvent to form a network structure with both high reactivity and steric stability. During the melt plasticizing stage, this modified chain extender efficiently bridges the broken molecular chains of recycled polyester through epoxy groups. At the same time, the strong polarity of the imide ring enhances the entanglement density of the flexible segments of polybutylene succinate, forming a rigid-tough synergistic transition layer in the interfacial region. The crystal regularity of the fiber body is improved after chain extension, and the resistance to molecular chain slippage is increased, giving the base fabric higher tensile deformation resistance. The support of the rigid network on the fiber surface reduces the wear and shedding of cotton fibers in the blended fabric, synergistically improving the overall abrasion resistance of the base fabric. Detailed Implementation

[0029] This application discloses an environmentally friendly base fabric based on recycled fibers and its preparation method. Unless otherwise specified, all raw materials used in this application can be obtained from commercially available sources. The following detailed description, in conjunction with embodiments, further illustrates this application: Raw material specifications: Recycled polyester, model SD6003HT, purchased from Shenzhen Dilingwei Technology Co., Ltd.; polybutylene succinate, purchased from Wuhan Shuer Biotechnology Co., Ltd.; methyl methacrylate-3,4-epoxycyclohexyl methacrylate (CAS No.: 82428-30-6); antistatic agent SN M0A-3PK, purchased from Jinan Guocheng Chemical Co., Ltd.; penetrant JL-FN, purchased from Shaoxing Branch of Suzhou Jinyunlai Textile Auxiliaries Co., Ltd.; octadecyl dimethyl (trimethoxysilylpropyl)ammonium chloride (CAS No.: 27668-52-6); N-phenylmaleimide (CAS No.: 941-69-5); N,N-dimethylformamide (CAS No.: 68-12-2); azobisisobutyronitrile (CAS No.: 78-67-1).

[0030] Example 1 Preparation of recycled polyester fibers The mass ratio of recycled polyester, polybutylene succinate, and chain extender is 1:0.25:0.004, and the chain extender is methyl methacrylate-3,4-epoxycyclohexyl methacrylate.

[0031] Recycled polyester was crushed and mixed with polybutylene succinate. The mixture was vacuum dried at 80°C for 4 hours and then fed into a twin-screw extruder. It was melted and plasticized under the conditions of 180°C in zone 1, 210°C in zone 2, 230°C in zone 3, and 220°C at the die head. A chain extender was injected in the middle and rear of the melting section. The screw speed was 300 rpm and the residence time was 120 s. The mixture was extruded, water-cooled, and pelletized at 30°C to obtain blended particles. The blended particles were fed into a spinning machine and extruded through a spinneret at 240°C. The internal stress was reduced by passing through a 200°C slow cooling zone, and then cooled and solidified by side blowing at a wind speed of 0.4 m / s and a temperature of 20°C. The mixture was wound into filaments at a speed of 3000 m / min to obtain recycled polyester fibers.

[0032] Preparation of environmentally friendly base fabric based on recycled fibers Weigh 50 parts of recycled polyester fiber and 30 parts of cotton fiber; the pre-wetting solution (solvent is water) contains 0.5% antistatic agent and 1% penetrant, the antistatic agent is SN M0A-3PK and the penetrant is JL-FN; the working solution (solvent is water) includes 30 g / L finishing agent and 1 g / L penetrant, the pH is 5-5.5, the finishing agent is octadecyl dimethyl (trimethoxysilylpropyl) ammonium chloride and the penetrant is JL-FN.

[0033] S1. Mix and open recycled polyester fiber and cotton fiber, comb them, the cylinder speed of the recycled polyester fiber combing is 280 rpm, the gap between the licker-in roller and the cylinder is 0.18 mm, the cylinder speed of the cotton fiber combing is 355 rpm, the flat sheet linear speed is 266 mm / min, draw them into slivers, and form them into a non-woven airflow web to obtain a fiber web. S2. The fiber web is pre-wetted with a pre-wetting solution at a temperature of 35°C and a roll-off rate of 80%. The moisture content after pre-wetting is 20%. After needle punching and reinforcement, a preliminary nonwoven fabric is obtained. S3. The initial nonwoven fabric is treated at 170℃ for 100s and then air-cooled (15m / s) to below 50℃ to obtain the nonwoven fabric. S4. The nonwoven fabric is post-treated with a working solution containing a finishing agent. During the finishing process, the fabric is dipped and rubbed twice. The dip and rubbed temperature is 20°C and the liquid rate is 70%. The fabric is pre-dried at 100°C for 2.5 minutes and then baked at 150°C for 2 minutes to obtain an environmentally friendly base fabric based on recycled fibers.

[0034] Example 2 Preparation of recycled polyester fibers The mass ratio of recycled polyester, polybutylene succinate, and chain extender is 1:0.25:0.006, and the chain extender is methyl methacrylate-3,4-epoxycyclohexyl methacrylate.

[0035] Recycled polyester was crushed and mixed with polybutylene succinate. The mixture was vacuum dried at 80°C for 4 hours and then fed into a twin-screw extruder. It was melted and plasticized under the conditions of 180°C in zone 1, 210°C in zone 2, 230°C in zone 3, and 220°C at the die head. A chain extender was injected in the middle and rear of the melting section. The screw speed was 300 rpm and the residence time was 120 s. The mixture was extruded, water-cooled, and pelletized at 30°C to obtain blended particles. The blended particles were fed into a spinning machine and extruded through a spinneret at 240°C. The internal stress was reduced by passing through a 200°C slow cooling zone, and then cooled and solidified by side blowing at a wind speed of 0.4 m / s and a temperature of 20°C. The mixture was wound into filaments at a speed of 3000 m / min to obtain recycled polyester fibers.

[0036] Preparation of environmentally friendly base fabric based on recycled fibers Weigh 70 parts of recycled polyester fiber and 50 parts of cotton fiber; the pre-wetting solution (solvent is water) contains 0.5% antistatic agent and 1% penetrant, the antistatic agent is SN M0A-3PK and the penetrant is JL-FN; the working solution (solvent is water) includes 50 g / L finishing agent and 2 g / L penetrant, the pH is 5-5.5, the finishing agent is octadecyl dimethyl (trimethoxysilylpropyl) ammonium chloride and the penetrant is JL-FN.

[0037] S1. Mix and open recycled polyester fiber and cotton fiber, comb them, the cylinder speed of the recycled polyester fiber combing is 280 rpm, the gap between the licker-in roller and the cylinder is 0.18 mm, the cylinder speed of the cotton fiber combing is 355 rpm, the flat sheet linear speed is 266 mm / min, draw them into slivers, and form them into a non-woven airflow web to obtain a fiber web. S2. The fiber web is pre-wetted with a pre-wetting solution at a temperature of 45°C and a roll-off rate of 90%. The moisture content after pre-wetting is 30%. After needle punching and reinforcement, a preliminary nonwoven fabric is obtained. S3. The initial nonwoven fabric is treated at 190℃ for 80s and then air-cooled (15m / s) to below 50℃ to obtain the nonwoven fabric. S4. The nonwoven fabric is post-treated with a working solution containing a finishing agent. During the finishing process, the fabric is dipped and rubbed twice. The dipping and rubbing temperature is 30°C and the liquid rinsing rate is 80%. The fabric is pre-dried at 110°C for 1.5 minutes and then baked at 160°C for 1 minute to obtain an environmentally friendly base fabric based on recycled fibers.

[0038] Example 3 Preparation of recycled polyester fibers The mass ratio of recycled polyester, polybutylene succinate, and chain extender is 1:0.25:0.005, and the chain extender is methyl methacrylate-3,4-epoxycyclohexyl methacrylate.

[0039] Recycled polyester was crushed and mixed with polybutylene succinate. The mixture was vacuum dried at 80°C for 4 hours and then fed into a twin-screw extruder. It was melted and plasticized under the conditions of 180°C in zone 1, 210°C in zone 2, 230°C in zone 3, and 220°C at the die head. A chain extender was injected in the middle and rear of the melting section. The screw speed was 300 rpm and the residence time was 120 s. The mixture was extruded, water-cooled, and pelletized at 30°C to obtain blended particles. The blended particles were fed into a spinning machine and extruded through a spinneret at 240°C. The internal stress was reduced by passing through a 200°C slow cooling zone, and then cooled and solidified by side blowing at a wind speed of 0.4 m / s and a temperature of 20°C. The mixture was wound into filaments at a speed of 3000 m / min to obtain recycled polyester fibers.

[0040] Preparation of environmentally friendly base fabric based on recycled fibers Weigh 60 parts of recycled polyester fiber and 40 parts of cotton fiber; the pre-wetting solution (solvent is water) contains 0.5% antistatic agent and 1% penetrant, the antistatic agent is SN M0A-3PK and the penetrant is JL-FN; the working solution (solvent is water) includes 40 g / L finishing agent and 1.5 g / L penetrant, the pH is 5-5.5, the finishing agent is octadecyl dimethyl (trimethoxysilylpropyl) ammonium chloride and the penetrant is JL-FN.

[0041] S1. Mix and open recycled polyester fiber and cotton fiber, comb them, the cylinder speed of the recycled polyester fiber combing is 280 rpm, the gap between the licker-in roller and the cylinder is 0.18 mm, the cylinder speed of the cotton fiber combing is 355 rpm, the flat sheet linear speed is 266 mm / min, draw them into slivers, and form them into a non-woven airflow web to obtain a fiber web. S2. The fiber web is pre-wetted with a pre-wetting solution at a temperature of 40°C and a roll-off rate of 85%. The moisture content after pre-wetting is 25%. After needle punching and reinforcement, a preliminary nonwoven fabric is obtained. S3. The initial nonwoven fabric is treated with a setting process, and then treated at 180℃ for 90s, followed by air cooling (15m / s) to below 50℃ to obtain the nonwoven fabric. S4. The nonwoven fabric is post-treated with a working solution containing a finishing agent. The finishing process involves two dips and two nips, with a dip and nips temperature of 25°C and a nips ratio of 75%. The fabric is then pre-dried at 105°C for 2 minutes and baked at 155°C for 1.5 minutes to obtain an environmentally friendly base fabric based on recycled fibers.

[0042] Example 4 Example 4 is based on Example 3. The only difference between Example 4 and Example 3 is that the mass ratio of recycled polyester, polybutylene succinate and chain extender in Example 4 is 1:0.25:0.002.

[0043] Example 5 Example 5 is based on Example 3. The only difference between Example 5 and Example 3 is that the mass ratio of recycled polyester, polybutylene succinate and chain extender in Example 5 is 1:0.25:0.008.

[0044] Example 6 Example 6 is based on Example 3. The only difference between Example 6 and Example 3 is that the chain extender 3,4-epoxycyclohexyl methyl methacrylate in Example 6 is modified. It is prepared using the following steps: The mass ratio of methyl methacrylate-3,4-epoxycyclohexyl ester to N-phenylmaleimide is 1:0.8, the solvent is N,N-dimethylformamide, and the initiator is azobisisobutyronitrile.

[0045] 3,4-epoxycyclohexyl methyl methacrylate and N-phenylmaleimide were added to a solvent with a solid content of 20%. An initiator accounting for 1% of the total monomer mass was added. Under a nitrogen atmosphere, the mixture was heated to 80°C and stirred at 200 rpm for 6 hours. After cooling, ethanol was added to terminate the reaction. The mixture was filtered, washed with 50% ethanol aqueous solution, and dried under vacuum at 60°C to constant weight to obtain the modified chain extender.

[0046] Example 7 Example 7 is based on Example 6. The only difference between Example 7 and Example 6 is that in Example 7, the mass ratio of methyl methacrylate-3,4-epoxycyclohexyl ester and N-phenylmaleimide is 1:1.

[0047] Example 8 Example 8 is based on Example 6. The only difference between Example 8 and Example 6 is that the mass ratio of methyl methacrylate-3,4-epoxycyclohexyl ester and N-phenylmaleimide in Example 8 is 1:0.9.

[0048] Example 9 Example 9 is based on Example 6. The only difference between Example 9 and Example 6 is that in Example 9, the mass ratio of methyl methacrylate-3,4-epoxycyclohexyl ester and N-phenylmaleimide is 1:0.6.

[0049] Example 10 Example 10 is based on Example 6. The only difference between Example 10 and Example 6 is that in Example 10, the mass ratio of methyl methacrylate-3,4-epoxycyclohexyl ester and N-phenylmaleimide is 1:1.2.

[0050] Example 11 Example 11 is based on Example 3. The only difference between Example 11 and Example 3 is that the pre-wetting conditions in step S2 of Example 11 are a temperature of 30°C, a roll yield of 75%, and a moisture content of 15% after pre-wetting.

[0051] Example 12 Example 12 is based on Example 3. The only difference between Example 12 and Example 3 is that in Example 12, the pre-wetting conditions in step S2 are 50°C, 95% roll residue, and 35% moisture content after pre-wetting.

[0052] Example 13 Example 13 is based on Example 3. The only difference between Example 13 and Example 3 is that the shaping treatment in step S3 of Example 13 is performed at 160°C for 120 seconds.

[0053] Example 14 Example 14 is based on Example 3. The only difference between Example 14 and Example 3 is that the shaping treatment in step S3 of Example 14 is performed at 200°C for 70 seconds.

[0054] Example 15 Example 15 is based on Example 3. The only difference between Example 15 and Example 3 is that in Example 15, during the post-treatment in step S4, the process involves two dips and two rolls, with a dip and roll temperature of 15°C, a roll yield of 65%, pre-drying at 90°C for 3.5 min, and baking at 140°C for 3 min.

[0055] Example 16 Example 16 is based on Example 3. The only difference between Example 16 and Example 3 is that in Example 16, during the post-treatment in step S4, the process involves two dips and two rolls with a dip and roll temperature of 35°C, a roll yield of 85%, pre-drying at 120°C for 1 min, and baking at 170°C for 0.5 min.

[0056] Comparative Example 1 Comparative Example 1 is based on Example 3. The only difference between Comparative Example 1 and Example 3 is that no chain extender is added when preparing the recycled polyester fiber in Comparative Example 1.

[0057] Preparation of recycled polyester fibers The mass ratio of recycled polyester fiber, polybutylene succinate, and chain extender is 1:0.25.

[0058] Recycled polyester was crushed and mixed with polybutylene succinate. The mixture was vacuum dried at 80°C for 4 hours and then fed into a twin-screw extruder. The mixture was melt-plasticized under the following conditions: zone 1 180°C, zone 2 210°C, zone 3 230°C, and die head 220°C. The screw speed was 300 rpm and the residence time was 120 s. The mixture was extruded, water-cooled, and pelletized at 30°C to obtain blended particles. The blended particles were fed into a spinning machine and extruded through a spinneret at 240°C. The internal stress was reduced by passing through a 200°C slow cooling zone, and then the mixture was cooled and solidified by side blowing at a speed of 0.4 m / s and a temperature of 20°C. The mixture was then wound into filaments at a speed of 3000 m / min to obtain recycled polyester fibers.

[0059] Performance testing (1) Select GB / T 3923.1-2013 Textiles - Tensile properties of fabrics - Part 1: Determination of breaking strength and elongation at break (strip method) as the standard, test and calculate the tensile strength of the specimen. Prepare three samples for each specimen, take the average value after measurement, and record the results in Table 1.

[0060] (2) Select GB / T 21196.2-2007 Textiles Martindale Method for the determination of abrasion resistance of fabrics - Part 2: Determination of sample breakage as the standard, rub the sample, record the number of revolutions when the sample breaks, prepare three samples for each sample, take the average value after measurement, and record the results in Table 1.

[0061] Table 1. Test results of tensile and abrasion resistance of environmentally friendly base fabric. As shown in Table 1, the tensile strength of Examples 1-3 is greater than 47.7 MPa and the number of revolutions when the hole is broken is greater than 22658 r, which shows that the environmentally friendly base fabric based on recycled fiber prepared in this application has good tensile properties and wear resistance.

[0062] As shown in Table 1, the only difference between Examples 4 and 5 and Example 3 is that the proportion of components in the recycled polyester fiber was disrupted in Examples 4 and 5. Compared with Example 3, the performance of Examples 4 and 5 was reduced. This is because too much or too little chain extender will affect the performance of the recycled polyester fiber, resulting in insufficient molecular chain repair or excessive crosslinking density and increased brittleness, thus reducing the performance of the base fabric.

[0063] As shown in Table 1, the only difference between Examples 6-10 and Example 3 is that Examples 6-8 modified methyl methacrylate-3,4-epoxycyclohexyl ester under a limited composition ratio to enhance the intermolecular forces of the recycled polyester fiber, resulting in improved performance of Examples 6-8; Examples 9 and 10 disrupted the optimal ratio, resulting in decreased performance.

[0064] As shown in Table 1, the only difference between Examples 11 and 12 and Example 3 is that the pre-wetting conditions were changed in Examples 11 and 12. Compared with Example 3, the performance of Examples 11 and 12 has decreased. This is because the destruction of the limiting conditions will lead to insufficient fiber softening, weakening of entanglement, or excessive swelling of cotton fibers, resulting in a loose structure and thus a decrease in the performance of the base fabric.

[0065] As shown in Table 1, the only difference between Examples 13 and 14 and Example 3 is that the conditions for the shaping treatment were disrupted in Examples 13 and 14. Compared with Example 3, the performance of Examples 13 and 14 decreased. This is because changing the shaping treatment conditions will lead to insufficient crystallization, low molecular chain orientation or slight degradation, resulting in a loss of toughness and thus a decrease in performance.

[0066] As shown in Table 1, the only difference between Examples 15 and 16 and Example 3 is that the post-treatment conditions were changed in Examples 15 and 16. Compared with Example 3, the performance of Examples 15 and 16 decreased. This is because changing the post-treatment conditions can lead to insufficient cross-linking reaction or excessive cross-linking and surface hardening, thus resulting in a decrease in performance.

[0067] As shown in Table 1, the only difference between Comparative Example 1 and Example 3 is that no chain extender was added when preparing the recycled polyester fiber in Comparative Example 1. Compared with Example 3, the performance of Comparative Example 1 is significantly reduced. This is because without the chain extender, the molecular chain breakage in the recycled polyester is not repaired, the phase separation phenomenon is serious, the performance of the recycled polyester fiber is reduced, and thus the performance of the base fabric is significantly reduced.

[0068] This specific embodiment is merely an explanation of this application and is not intended to limit it. Based on the above description, those skilled in the art can make various changes and modifications without departing from the technical concept of this application. The technical scope of this application is not limited to the contents of the specification but must be determined according to the scope of the claims.

Claims

1. An environmentally friendly base fabric based on recycled fibers, characterized in that: The raw materials for preparation include the following components in parts by weight: 50-70 parts recycled polyester fiber 30-50 parts cotton fiber; The recycled polyester fiber is prepared using the following steps: The recycled polyester is crushed, mixed with polybutylene succinate and dried, melt-plasticized, and a chain extender is added. After reaction, it is extruded and pelletized to obtain blended particles. The blended particles are spun and extruded, cooled and solidified, and wound into filaments to obtain recycled polyester fibers. The raw materials used in the preparation also include finishing agents, antistatic agents, and penetrants.

2. The environmentally friendly base fabric based on recycled fibers according to claim 1, characterized in that: The mass ratio of the recycled polyester, polybutylene succinate, and chain extender is 1:0.25:(0.004-0.006).

3. The environmentally friendly base fabric based on recycled fibers according to claim 2, characterized in that: The chain extender includes methyl methacrylate-3,4-epoxycyclohexyl methacrylate.

4. The environmentally friendly base fabric based on recycled fibers according to claim 3, characterized in that: The methyl methacrylate-3,4-epoxycyclohexyl methacrylate was modified and prepared using the following steps: 3,4-epoxycyclohexyl methyl methacrylate and N-phenylmaleimide were added to a solvent, an initiator was added, and the reaction was heated and stirred under a protective atmosphere. The reaction was terminated after cooling, and the product was filtered, washed, and dried to obtain the modified chain extender.

5. The environmentally friendly base fabric based on recycled fibers according to claim 4, characterized in that: The mass ratio of methyl methacrylate-3,4-epoxycyclohexyl ester to N-phenylmaleimide is 1:(0.8-1).

6. The environmentally friendly base fabric based on recycled fibers according to claim 1, characterized in that: The finishing agent includes octadecyl dimethyl (trimethoxysilylpropyl) ammonium chloride.

7. A method for preparing an environmentally friendly base fabric based on recycled fibers as described in any one of claims 1-6, characterized in that: Includes the following steps: S1. Mix, open, comb, draw, and form a web of recycled polyester fiber and cotton fiber to obtain a fiber web; S2. After pre-wetting the fiber web and reinforcing it with needle punch, a preliminary nonwoven fabric is obtained. S3. The initial nonwoven fabric is shaped to obtain a nonwoven fabric; S4. The nonwoven fabric is post-treated with a working solution containing a finishing agent to obtain an environmentally friendly base fabric based on recycled fibers.

8. The method for preparing the environmentally friendly base fabric based on recycled fibers according to claim 7, characterized in that: In step S2, the pre-wetting treatment uses a pre-wetting solution, which includes an antistatic agent and a penetrant. The pre-wetting conditions are a temperature of 35-45°C, a roll residue of 80-90%, and a moisture content of 20-30% after pre-wetting.

9. The method for preparing the environmentally friendly base fabric based on recycled fibers according to claim 7, characterized in that: The shaping process in step S3 is performed at 170-190℃ for 80-100 seconds, followed by air cooling.

10. The method for preparing the environmentally friendly base fabric based on recycled fibers according to claim 7, characterized in that: In step S4, the working solution includes 30-50 g / L finishing agent and 1-2 g / L penetrant, with a pH of 5-5.

5. During finishing, the process involves two dips and two nips, with a dip and nips temperature of 20-30°C and a nips-to-liquid ratio of 70-80%. The solution is then pre-dried at 100-110°C for 1.5-2.5 min and baked at 150-160°C for 1-2 min.

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