Preparation method of ultrasonic-bondable degradable anti-pilling spunlace nonwoven fabric

Abstract

The application provides a preparation method of ultrasonic-bondable degradable water-jet non-woven fabric, and relates to the technical field of non-woven fabric preparation.The method comprises the following steps: uniformly mixing low-melting-point polybutylene succinate, polyphosphate and tributyl citrate to obtain material A; melting material A and high-melting-point polylactic acid by two screws of a two-component spinning machine respectively, spinning to obtain PLA / PBS composite fibers with a core-sheath structure, drying, and then cutting into PLA / PBS composite short fibers with a core-sheath structure; mixing the obtained composite short fibers with cellulose fibers, and using a web former to form a fiber web; treating the obtained fiber web by a high-pressure water-jet machine to obtain a water-jet fiber web; and drying to obtain the degradable water-jet non-woven fabric.The application uses the core-sheath PLA / PBS composite fibers, and the ultrasonic-bondable characteristic of the fibers can effectively bond the cellulose fibers and the bio-based fiber together, so that a new type of non-woven fabric with high strength, low labor cost and ultrasonic-bondability is formed.

Description

Technical Field

[0001] This invention provides a method for preparing a biodegradable, anti-pilling, spunlace nonwoven fabric that can be ultrasonically bonded, relating to the field of nonwoven fabric preparation technology. Background Technology

[0002] With increasing global environmental awareness and the demand for sustainable resource utilization, the application of biodegradable materials is receiving growing attention. Nonwoven fabrics, as an important textile material, are widely used in various fields such as medical, hygiene, packaging, and agriculture due to their low cost, rapid production, and versatility. However, most nonwoven fabrics currently use non-degradable synthetic polymers, such as polypropylene and polyester. These synthetic materials are difficult to degrade naturally in the environment, causing serious plastic pollution problems and long-term negative impacts on ecosystems.

[0003] To address this issue, cellulose fibers, as a renewable resource with enormous potential, are receiving increasing attention. Cellulose fibers are not only widely available and inexpensive, but also possess excellent biodegradability and renewability, making them an ideal alternative to traditional petroleum-based fibers (such as polypropylene and polyester). Using cellulose fibers to prepare nonwoven products can reduce dependence on non-degradable plastics, thereby reducing environmental pollution, promoting green and low-carbon development, and enhancing market competitiveness in environmental protection.

[0004] However, the application of cellulose fibers in nonwoven fabric production currently faces several technical challenges. Because cellulose fibers themselves lack adhesive properties, they require the use of glue or manual sewing to prepare nonwoven fabrics. This not only increases production costs but also potentially introduces pollution problems from chemical adhesives. This limits the widespread application of cellulose fibers in efficient and environmentally friendly production. Therefore, developing new cellulose fiber bonding technologies, such as hydroentangling, thermal bonding, or enhancing bonding performance through modified fibers, has become a current research hotspot and direction. The introduction of these innovative processes will further enhance the performance and market application potential of cellulose-based nonwoven fabrics, providing a greener and more sustainable solution to the plastic pollution problem. Through technological innovation and market promotion, cellulose fibers are expected to play a more important role in the future nonwoven fabric industry, driving the global textile industry towards a more environmentally friendly and sustainable direction. Summary of the Invention

[0005] To address the problem of ineffective bonding of cellulose fibers, this study proposes an innovative solution: by introducing core-sheath bicomponent PLA / PBS fibers, and utilizing their ultrasonic bonding properties, cellulose fibers and bio-based fibers can be effectively bonded together, forming a novel nonwoven fabric with high strength, low labor costs, and ultrasonic bonding capability. The specific solution is as follows:

[0006] A method for preparing an ultrasonically bondable, biodegradable, anti-pilling spunlace nonwoven fabric includes the following steps:

[0007] S1. Take low-melting-point polybutylene succinate (PBS), polyphosphate (PPE), and high-melting-point polylactic acid (PLA) granules and dry them.

[0008] S2. Mix low-melting-point polybutylene succinate (PBS) with polyphosphate (PPE) and tributyl citrate (TBC) until homogeneous to obtain material A;

[0009] S3. Material A and high-melting-point polylactic acid (PLA) are melted separately by two screws of a two-component spinning machine. The two melts are spun through a core-sheath spinning assembly to obtain core-sheath PLA / PBS composite fiber.

[0010] S4. The obtained sheath-core PLA / PBS composite fibers are dried and then cut into sheath-core PLA / PBS composite short fibers. The obtained sheath-core PLA / PBS composite short fibers are mixed with cellulose fibers and then formed into a web using a web forming machine to obtain a fiber web. The obtained fiber web is treated by a high-pressure hydroentangling machine to obtain a hydroentangled fiber web. After drying, a biodegradable anti-pilling hydroentangled nonwoven fabric is obtained.

[0011] Preferably, the drying in step S1 is carried out under vacuum at 45-65°C for 8-12 hours, and the moisture content of the low-melting-point polybutylene succinate (PBS), polyphosphate (PPE), and high-melting-point polylactic acid (PLA) granules after drying is less than 50 ppm.

[0012] Preferably, the low-melting-point polybutylene succinate mentioned in step S1 has a melting point of 105-130°C, and the high-melting-point polylactic acid has a melting point of 155°C-175°C.

[0013] Preferably, in material A described in step S2, the mass ratio of low-melting-point polybutylene succinate to polyphosphate and tributyl citrate is (80-100):(10-15):(3-5).

[0014] Preferably, the mass ratio of the high-melting-point polylactic acid in step S3 to the low-melting-point polybutylene succinate in material A is (10-90):(10-90).

[0015] Preferably, the melting temperature of material A in step S3 is controlled at 110-135℃; the melting temperature of the high-melting-point polylactic acid is controlled at 160-180℃.

[0016] Preferably, in step S3, the spinning temperature is 155-170℃, the winding speed is 700-1300m / min, the drawing temperature is 60-90℃, and the drawing ratio is 2.5-4.5 times.

[0017] Preferably, the drying in step S4 is carried out by hot air drying at 80-130°C, and the length of the core-sheath PLA / PBS composite short fiber is 3-100 mm.

[0018] Preferably, the cellulose fiber in step S4 includes one or more of viscose fiber, cotton, linen, bamboo fiber, and regenerated cellulose fiber.

[0019] Preferably, the cellulose fibers described in step S4 have a length of 30-50 mm.

[0020] Preferably, the mass ratio of the core-sheath PLA / PBS composite short fibers to cellulose fibers in step S4 is (1.25-7):(3-5).

[0021] Preferably, the web formation in step S4 is achieved using airflow, with an airflow intensity of 0.5-1.0 m / s.

[0022] Preferably, in step S4, the hydroentangling pressure is 80-150 bar, the number of hydroentangling cycles is 2-4, and the speed of the fiber web passing through the hydroentangling machine is 10-30 m / min; the drying is carried out by hot air drying at a temperature of 80-100℃.

[0023] The beneficial effects of this invention are as follows:

[0024] This invention introduces a core-sheath bicomponent PLA / PBS fiber, which utilizes its ultrasonic bonding properties to effectively bond cellulose fibers and bio-based fibers together, forming a novel nonwoven fabric with high strength, low labor costs, and ultrasonic bonding capability.

[0025] This nonwoven fabric utilizes the properties of PBS, which has a much lower melting point than conventional PLA and stronger adhesion, increasing the adhesion between PLA / PBS fibers and cellulose fibers and suppressing fuzzing. Secondly, the good flexibility of PBS gives the PLA / PBS composite fibers a soft touch, helping to reduce friction between electronic devices and nonwoven packaging.

[0026] Furthermore, in the molten state, the viscosity and flowability of PLA and PBS need to be coordinated to a certain extent; otherwise, inconsistent stretching and winding behaviors of the two materials during spinning will occur, affecting the integrity and uniformity of the core-sheath structure. During stretching, the PBS sheath is overstretched while the PLA core is understretched, ultimately affecting the mechanical properties and appearance of the fiber. During winding and drawing, the core and sheath materials need to have a certain degree of mechanical property matching. If the mechanical properties of PLA and PBS differ too much, delamination or interfacial slippage between the core and sheath will occur during winding and drawing, leading to a decrease in the overall strength of the fiber. This is especially true when PBS is used as the sheath, which can cause cracks or breakage during spinning. Although PLA and PBS serve as the core and sheath of the core-sheath structure, respectively, the interfacial interaction between them is still important during spinning. Traditional methods struggle to ensure good interfacial adhesion, leading to sheath delamination or fuzzing during drawing and subsequent processing. In our research and development, we found that simply controlling the melt temperature in a traditional manner cannot solve the above-mentioned problems in the core-sheath bicomponent PLA / PBS fiber of this invention. This invention solves these problems by adding two special components to PBS. This improves the overall mechanical properties and appearance of the nonwoven fabric. Furthermore, we found that adding these two special components to the core-sheath bicomponent fibers also enhanced the ultrasonic bonding properties of the resulting nonwoven fabric.

[0027] Therefore, the core-sheath PLA / PBS fiber and cellulose fiber nonwoven fabric materials of the present invention have important significance and application prospects in terms of environmental protection, sustainable resource utilization and cost reduction. Detailed Implementation

[0028] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those familiar to those skilled in the art. Furthermore, any methods and materials similar to or equivalent to those described herein may be applied to this invention. The preferred embodiments and materials described herein are for illustrative purposes only and do not limit the scope of this application.

[0030] Unless otherwise specified, the experimental methods used in the following examples are conventional methods, and the experimental materials used in the following examples are all purchased from commercial channels.

[0031] Preparation of a biodegradable anti-pilling spunlace nonwoven fabric that can be ultrasonically bonded:

[0032] S1. Take low-melting-point polybutylene succinate (PBS), polyphosphate (PPE), and high-melting-point polylactic acid (PLA) granules and dry them.

[0033] S2. Mix low-melting-point polybutylene succinate (PBS) with polyphosphate (PPE) and tributyl citrate (TBC) until homogeneous to obtain material A;

[0034] S3. Material A and high-melting-point polylactic acid (PLA) are melted separately by two screws of a two-component spinning machine. The two melts are spun through a core-sheath spinning assembly to obtain core-sheath PLA / PBS composite fiber.

[0035] S4. The obtained sheath-core PLA / PBS composite fibers are dried and then cut into sheath-core PLA / PBS composite short fibers. The obtained sheath-core PLA / PBS composite short fibers are mixed with cellulose fibers and then formed into a web using a web forming machine to obtain a fiber web. The obtained fiber web is treated by a high-pressure hydroentangling machine to obtain a hydroentangled fiber web. After drying, a biodegradable anti-pilling hydroentangled nonwoven fabric is obtained.

[0036] The drying process described in step S1 involves vacuum drying at 45-65°C for 8-12 hours. After drying, the moisture content of the low-melting-point polybutylene succinate (PBS), polyphosphate (PPE), and high-melting-point polylactic acid (PLA) granules is less than 50 ppm.

[0037] The low-melting-point polybutylene succinate mentioned in step S1 has a melting point of 105-130℃, and the high-melting-point polylactic acid has a melting point of 155℃-175℃.

[0038] In step S2, the mass ratio of low-melting-point polybutylene succinate to polyphosphate and tributyl citrate in material A is (80-100):(10-15):(3-5).

[0039] The mass ratio of high-melting-point polylactic acid in step S3 to low-melting-point polybutylene succinate in material A is (10-90):(10-90).

[0040] In step S3, the melting temperature of material A is controlled at 110-135℃; the melting temperature of high-melting-point polylactic acid is controlled at 160-180℃.

[0041] In step S3, the spinning temperature is 155-170℃, the winding speed is 700-1300m / min, the drawing temperature is 60-90℃, and the drawing ratio is 2.5-4.5 times.

[0042] The drying process described in step S4 involves hot air drying at 80-130℃, wherein the length of the core-sheath PLA / PBS composite short fibers is 3-100mm.

[0043] The cellulose fibers mentioned in step S4 include one or more of viscose fiber, cotton, linen, bamboo fiber, and regenerated cellulose fiber.

[0044] The cellulose fibers described in step S4 have a length of 30-50 mm.

[0045] In step S4, the mass ratio of the core-sheath PLA / PBS composite short fiber to the cellulose fiber is (1.25-7):(3-5).

[0046] The web formation described in step S4 is achieved using airflow, with an airflow intensity of 0.5-1.0 m / s.

[0047] In step S4, the hydroentangling pressure is 80-150 bar, the number of hydroentangling cycles is 2-4, and the speed of the fiber web passing through the hydroentangling machine is 10-30 m / min; the drying is carried out by hot air drying at a temperature of 80-100℃.

[0048] Example 1: Preparation of a biodegradable, anti-pilling, spunlace nonwoven fabric that can be ultrasonically bonded:

[0049] S1. Take low-melting-point polybutylene succinate (PBS), polyphosphate (PPE), and high-melting-point polylactic acid (PLA) granules and dry them.

[0050] S2. Mix low-melting-point polybutylene succinate (PBS) with polyphosphate (PPE) and tributyl citrate (TBC) until homogeneous to obtain material A;

[0051] S3. Material A and high-melting-point polylactic acid (PLA) are melted separately by two screws of a two-component spinning machine. The two melts are spun through a core-sheath spinning assembly to obtain core-sheath PLA / PBS composite fiber.

[0052] S4. The obtained sheath-core PLA / PBS composite fibers are dried and then cut into sheath-core PLA / PBS composite short fibers. The obtained sheath-core PLA / PBS composite short fibers are mixed with cellulose fibers and then formed into a web using a web forming machine to obtain a fiber web. The obtained fiber web is treated by a high-pressure hydroentangling machine to obtain a hydroentangled fiber web. After drying, a biodegradable anti-pilling hydroentangled nonwoven fabric is obtained.

[0053] The drying process described in step S1 involves vacuum drying at 45°C for 12 hours. After drying, the moisture content of the low-melting-point polybutylene succinate (PBS), polyphosphate (PPE), and high-melting-point polylactic acid (PLA) granules is less than 50 ppm.

[0054] The low-melting-point polybutylene succinate mentioned in step S1 has a melting point of 105-130℃, and the high-melting-point polylactic acid has a melting point of 155℃-175℃.

[0055] In material A described in step S2, the mass ratio of low-melting-point polybutylene succinate to polyphosphate and tributyl citrate is 100:10:3.

[0056] The mass ratio of high-melting-point polylactic acid in step S3 to low-melting-point polybutylene succinate in material A is 90:10.

[0057] In step S3, the melting temperature of material A is controlled at 110°C; the melting temperature of high-melting-point polylactic acid is controlled at 160°C.

[0058] In step S3, the spinning temperature is 155°C, the winding speed is 700 m / min, the drawing temperature is 60°C, and the drawing ratio is 2.5 times.

[0059] The drying process described in step S4 involves hot air drying at 80°C, where the core-sheath PLA / PBS composite short fibers have a length of 30 mm.

[0060] The cellulose fibers mentioned in step S4 include cotton fibers.

[0061] The cellulose fibers described in step S4 have a fineness of 1.5-4.5 tex and a length of 30 mm.

[0062] In step S4, the mass ratio of the core-sheath PLA / PBS composite short fibers to cellulose fibers is 7:3.

[0063] The web formation described in step S4 is achieved using airflow with an airflow intensity of 0.5 m / s.

[0064] In step S4, the hydroentangling is performed at a pressure of 80 bar, with two hydroentangling cycles, and the fiber web passes through the hydroentangling machine at a speed of 10 m / min. The drying process is carried out using hot air at a temperature of 80°C.

[0065] Example 2: Preparation of a biodegradable anti-pilling spunlace nonwoven fabric that can be ultrasonically bonded:

[0066] S1. Take low-melting-point polybutylene succinate (PBS), polyphosphate (PPE), and high-melting-point polylactic acid (PLA) granules and dry them.

[0067] S2. Mix low-melting-point polybutylene succinate (PBS) with polyphosphate (PPE) and tributyl citrate (TBC) until homogeneous to obtain material A;

[0068] S3. Material A and high-melting-point polylactic acid (PLA) are melted separately by two screws of a two-component spinning machine. The two melts are spun through a core-sheath spinning assembly to obtain core-sheath PLA / PBS composite fiber.

[0069] S4. The obtained sheath-core PLA / PBS composite fibers are dried and then cut into sheath-core PLA / PBS composite short fibers. The obtained sheath-core PLA / PBS composite short fibers are mixed with cellulose fibers and then formed into a web using a web forming machine to obtain a fiber web. The obtained fiber web is treated by a high-pressure hydroentangling machine to obtain a hydroentangled fiber web. After drying, a biodegradable anti-pilling hydroentangled nonwoven fabric is obtained.

[0070] The drying process described in step S1 involves vacuum drying at 65°C for 12 hours. After drying, the moisture content of the low-melting-point polybutylene succinate (PBS), polyphosphate (PPE), and high-melting-point polylactic acid (PLA) granules is less than 50 ppm.

[0071] The low-melting-point polybutylene succinate mentioned in step S1 has a melting point of 105-130℃, and the high-melting-point polylactic acid has a melting point of 155℃-175℃.

[0072] In material A described in step S2, the mass ratio of low-melting-point polybutylene succinate to polyphosphate and tributyl citrate is 100:15:5.

[0073] The mass ratio of high-melting-point polylactic acid in step S3 to low-melting-point polybutylene succinate in material A is 90:90.

[0074] In step S3, the melting temperature of material A is controlled at 135°C; the melting temperature of high-melting-point polylactic acid is controlled at 180°C.

[0075] In step S3, the spinning temperature is 170℃, the winding speed is 700m / min, the drawing temperature is 60℃, and the drawing ratio is 2.5 times.

[0076] The drying process described in step S4 involves hot air drying at 80°C, where the core-sheath PLA / PBS composite short fibers have a length of 30 mm.

[0077] The cellulose fibers mentioned in step S4 include cotton fibers.

[0078] The cellulose fibers described in step S4 have a fineness of 1.5-4.5 tex and a length of 30 mm.

[0079] In step S4, the mass ratio of the core-sheath PLA / PBS composite short fibers to cellulose fibers is 7:3.

[0080] The web formation described in step S4 is achieved using airflow with an airflow intensity of 0.5 m / s.

[0081] In step S4, the hydroentangling is performed at a pressure of 150 bar, with two hydroentangling cycles, and the fiber web passes through the hydroentangling machine at a speed of 30 m / min. The drying process is carried out using hot air at a temperature of 100°C.

[0082] Example 3: Preparation of a biodegradable anti-pilling spunlace nonwoven fabric that can be ultrasonically bonded:

[0083] S1. Take low-melting-point polybutylene succinate (PBS), polyphosphate (PPE), and high-melting-point polylactic acid (PLA) granules and dry them.

[0084] S2. Mix low-melting-point polybutylene succinate (PBS) with polyphosphate (PPE) and tributyl citrate (TBC) until homogeneous to obtain material A;

[0085] S3. Material A and high-melting-point polylactic acid (PLA) are melted separately by two screws of a two-component spinning machine. The two melts are spun through a core-sheath spinning assembly to obtain core-sheath PLA / PBS composite fiber.

[0086] S4. The obtained sheath-core PLA / PBS composite fibers are dried and then cut into sheath-core PLA / PBS composite short fibers. The obtained sheath-core PLA / PBS composite short fibers are mixed with cellulose fibers and then formed into a web using a web forming machine to obtain a fiber web. The obtained fiber web is treated by a high-pressure hydroentangling machine to obtain a hydroentangled fiber web. After drying, a biodegradable anti-pilling hydroentangled nonwoven fabric is obtained.

[0087] The drying process described in step S1 involves vacuum drying at 65°C for 8 hours. After drying, the moisture content of the low-melting-point polybutylene succinate (PBS), polyphosphate (PPE), and high-melting-point polylactic acid (PLA) granules is less than 50 ppm.

[0088] The low-melting-point polybutylene succinate mentioned in step S1 has a melting point of 105-130℃, and the high-melting-point polylactic acid has a melting point of 155℃-175℃.

[0089] In material A mentioned in step S2, the mass ratio of low-melting-point polybutylene succinate to polyphosphate and tributyl citrate is 80:15:5.

[0090] The mass ratio of high-melting-point polylactic acid in step S3 to low-melting-point polybutylene succinate in material A is 10:30.

[0091] In step S3, the melting temperature of material A is controlled at 135°C; the melting temperature of high-melting-point polylactic acid is controlled at 160°C.

[0092] In step S3, the spinning temperature is 160℃, the winding speed is 700m / min, the drawing temperature is 60℃, and the drawing ratio is 2.5 times.

[0093] The drying process described in step S4 involves hot air drying at 80°C, where the core-sheath PLA / PBS composite short fibers have a length of 30 mm.

[0094] The cellulose fiber wrapped in cotton fiber described in step S4.

[0095] The cellulose fibers described in step S4 have a fineness of 1.5-4.5 tex and a length of 30 mm.

[0096] In step S4, the mass ratio of the core-sheath PLA / PBS composite short fibers to cellulose fibers is 7:3.

[0097] The web formation described in step S4 is achieved using airflow with an airflow intensity of 0.8 m / s.

[0098] In step S4, the hydroentangling pressure is 100 bar, the hydroentangling is performed twice, and the speed of the fiber web passing through the hydroentangling machine is 10 m / min; the drying is carried out by hot air drying at a temperature of 80°C.

[0099] Example 4: Preparation of a biodegradable anti-pilling spunlace nonwoven fabric that can be ultrasonically bonded:

[0100] S1. Take low-melting-point polybutylene succinate (PBS), polyphosphate (PPE), and high-melting-point polylactic acid (PLA) granules and dry them.

[0101] S2. Mix low-melting-point polybutylene succinate (PBS) with polyphosphate (PPE) and tributyl citrate (TBC) until homogeneous to obtain material A;

[0102] S3. Material A and high-melting-point polylactic acid (PLA) are melted separately by two screws of a two-component spinning machine. The two melts are spun through a core-sheath spinning assembly to obtain core-sheath PLA / PBS composite fiber.

[0103] S4. The obtained sheath-core PLA / PBS composite fibers are dried and then cut into sheath-core PLA / PBS composite short fibers. The obtained sheath-core PLA / PBS composite short fibers are mixed with cellulose fibers and then formed into a web using a web forming machine to obtain a fiber web. The obtained fiber web is treated by a high-pressure hydroentangling machine to obtain a hydroentangled fiber web. After drying, a biodegradable anti-pilling hydroentangled nonwoven fabric is obtained.

[0104] The drying process described in step S1 involves vacuum drying at 65°C for 8 hours. After drying, the moisture content of the low-melting-point polybutylene succinate (PBS), polyphosphate (PPE), and high-melting-point polylactic acid (PLA) granules is less than 50 ppm.

[0105] The low-melting-point polybutylene succinate mentioned in step S1 has a melting point of 105-130℃, and the high-melting-point polylactic acid has a melting point of 155℃-175℃.

[0106] In material A mentioned in step S2, the mass ratio of low-melting-point polybutylene succinate to polyphosphate and tributyl citrate is 80:15:5.

[0107] The mass ratio of high-melting-point polylactic acid in step S3 to low-melting-point polybutylene succinate in material A is 10:30.

[0108] In step S3, the melting temperature of material A is controlled at 135°C; the melting temperature of high-melting-point polylactic acid is controlled at 160°C.

[0109] In step S3, the spinning temperature is 160℃, the winding speed is 700m / min, the drawing temperature is 90℃, and the drawing ratio is 2.5 times.

[0110] The drying process described in step S4 involves hot air drying at 100°C, wherein the core-sheath PLA / PBS composite short fibers have a length of 30 mm.

[0111] The cellulose fiber wrapped in cotton fiber described in step S4.

[0112] The cellulose fibers described in step S4 have a fineness of 1.5-4.5 tex and a length of 40 mm.

[0113] In step S4, the mass ratio of the core-sheath PLA / PBS composite short fibers to cellulose fibers is 1.25:5.

[0114] The web formation described in step S4 is achieved using airflow with an airflow intensity of 0.8 m / s.

[0115] In step S4, the hydroentangling pressure is 100 bar, the hydroentangling is performed twice, and the speed of the fiber web passing through the hydroentangling machine is 10 m / min; the drying is carried out by hot air drying at a temperature of 80°C.

[0116] The difference between Comparative Example 1 and Example 3 is that material A does not contain polyphosphate (PPE).

[0117] S1. Take low-melting-point polybutylene succinate (PBS) and high-melting-point polylactic acid (PLA) granules and dry them.

[0118] S2. Mix low-melting-point polybutylene succinate (PBS) and tributyl citrate (TBC) evenly to obtain material A;

[0119] S3. Material A and high-melting-point polylactic acid (PLA) are melted separately by two screws of a two-component spinning machine. The two melts are spun through a core-sheath spinning assembly to obtain core-sheath PLA / PBS composite fiber.

[0120] S4. The obtained core-sheath PLA / PBS composite fibers are dried and then cut into core-sheath PLA / PBS composite short fibers. The obtained core-sheath PLA / PBS composite short fibers are mixed with cellulose fibers and then formed into a web using a web forming machine to obtain a fiber web. The obtained fiber web is treated by a high-pressure hydroentangling machine to obtain a hydroentangled fiber web. After drying, a biodegradable hydroentangled nonwoven fabric is obtained.

[0121] The drying process described in step S1 involves vacuum drying at 65°C for 8 hours. After drying, the moisture content of the low-melting-point polybutylene succinate (PBS) and high-melting-point polylactic acid (PLA) granules is less than 50 ppm.

[0122] The low-melting-point polybutylene succinate mentioned in step S1 has a melting point of 105-130℃, and the high-melting-point polylactic acid has a melting point of 155℃-175℃.

[0123] In material A mentioned in step S2, the mass ratio of low-melting-point polybutylene succinate to tributyl citrate is 80:5.

[0124] The mass ratio of high-melting-point polylactic acid in step S3 to low-melting-point polybutylene succinate in material A is 10:30.

[0125] In step S3, the melting temperature of material A is controlled at 135°C; the melting temperature of high-melting-point polylactic acid is controlled at 160°C.

[0126] In step S3, the spinning temperature is 160℃, the winding speed is 700m / min, the drawing temperature is 60℃, and the drawing ratio is 2.5 times.

[0127] The drying process described in step S4 involves hot air drying at 80°C, where the core-sheath PLA / PBS composite short fibers have a length of 30 mm.

[0128] The cellulose fiber wrapped in cotton fiber described in step S4.

[0129] The cellulose fibers described in step S4 have a fineness of 1.5-4.5 tex and a length of 30 mm.

[0130] In step S4, the mass ratio of the core-sheath PLA / PBS composite short fibers to cellulose fibers is 7:3.

[0131] The web formation described in step S4 is achieved using airflow with an airflow intensity of 0.8 m / s.

[0132] In step S4, the hydroentangling pressure is 100 bar, the hydroentangling is performed twice, and the speed of the fiber web passing through the hydroentangling machine is 10 m / min; the drying is carried out by hot air drying at a temperature of 80°C.

[0133] The difference between Comparative Example 2 and Example 3 is that material A does not contain tributyl citrate (TBC).

[0134] S1. Take low-melting-point polybutylene succinate (PBS), polyphosphate (PPE), and high-melting-point polylactic acid (PLA) granules and dry them.

[0135] S2. Mix low-melting-point polybutylene succinate (PBS) and polyphosphate (PPE) evenly to obtain material A;

[0136] S3. Material A and high-melting-point polylactic acid (PLA) are melted separately by two screws of a two-component spinning machine. The two melts are spun through a core-sheath spinning assembly to obtain core-sheath PLA / PBS composite fiber.

[0137] S4. The obtained core-sheath PLA / PBS composite fibers are dried and then cut into core-sheath PLA / PBS composite short fibers. The obtained core-sheath PLA / PBS composite short fibers are mixed with cellulose fibers and then formed into a web using a web forming machine to obtain a fiber web. The obtained fiber web is treated by a high-pressure hydroentangling machine to obtain a hydroentangled fiber web. After drying, a biodegradable hydroentangled nonwoven fabric is obtained.

[0138] The drying process described in step S1 involves vacuum drying at 65°C for 8 hours. After drying, the moisture content of the low-melting-point polybutylene succinate (PBS), polyphosphate (PPE), and high-melting-point polylactic acid (PLA) granules is less than 50 ppm.

[0139] The low-melting-point polybutylene succinate mentioned in step S1 has a melting point of 105-130℃, and the high-melting-point polylactic acid has a melting point of 155℃-175℃.

[0140] In material A described in step S2, the mass ratio of low-melting-point polybutylene succinate to polyphosphate is 80:15.

[0141] The mass ratio of high-melting-point polylactic acid in step S3 to low-melting-point polybutylene succinate in material A is 10:30.

[0142] In step S3, the melting temperature of material A is controlled at 135°C; the melting temperature of high-melting-point polylactic acid is controlled at 160°C.

[0143] In step S3, the spinning temperature is 160℃, the winding speed is 700m / min, the drawing temperature is 60℃, and the drawing ratio is 2.5 times.

[0144] The drying process described in step S4 involves hot air drying at 80°C, where the core-sheath PLA / PBS composite short fibers have a length of 30 mm.

[0145] The cellulose fiber wrapped in cotton fiber described in step S4.

[0146] The cellulose fibers described in step S4 have a fineness of 1.5-4.5 tex and a length of 30 mm.

[0147] In step S4, the mass ratio of the core-sheath PLA / PBS composite short fibers to cellulose fibers is 7:3.

[0148] The web formation described in step S4 is achieved using airflow with an airflow intensity of 0.8 m / s.

[0149] In step S4, the hydroentangling pressure is 100 bar, the hydroentangling is performed twice, and the speed of the fiber web passing through the hydroentangling machine is 10 m / min; the drying is carried out by hot air drying at a temperature of 80°C.

[0150] The difference between Comparative Example 3 and Example 3 is that material A does not contain polyphosphate (PPE) and tributyl citrate (TBC).

[0151] S1. Take low-melting-point polybutylene succinate (PBS) and high-melting-point polylactic acid (PLA) granules and dry them.

[0152] S2. Take low-melting-point polybutylene succinate (PBS) as material A;

[0153] S3. Material A and high-melting-point polylactic acid (PLA) are melted separately by two screws of a two-component spinning machine. The two melts are spun through a core-sheath spinning assembly to obtain core-sheath PLA / PBS composite fiber.

[0154] S4. The obtained core-sheath PLA / PBS composite fibers are dried and then cut into core-sheath PLA / PBS composite short fibers. The obtained core-sheath PLA / PBS composite short fibers are mixed with cellulose fibers and then formed into a web using a web forming machine to obtain a fiber web. The obtained fiber web is treated by a high-pressure hydroentangling machine to obtain a hydroentangled fiber web. After drying, a biodegradable hydroentangled nonwoven fabric is obtained.

[0155] The drying process described in step S1 involves vacuum drying at 65°C for 8 hours. After drying, the moisture content of the low-melting-point polybutylene succinate (PBS) and high-melting-point polylactic acid (PLA) granules is less than 50 ppm.

[0156] The low-melting-point polybutylene succinate mentioned in step S1 has a melting point of 105-130℃, and the high-melting-point polylactic acid has a melting point of 155℃-175℃.

[0157] The mass ratio of high-melting-point polylactic acid to material A in step S3 is 10:30.

[0158] In step S3, the melting temperature of material A is controlled at 135°C; the melting temperature of high-melting-point polylactic acid is controlled at 160°C.

[0159] In step S3, the spinning temperature is 160℃, the winding speed is 700m / min, the drawing temperature is 60℃, and the drawing ratio is 2.5 times.

[0160] The drying process described in step S4 involves hot air drying at 80°C, where the core-sheath PLA / PBS composite short fibers have a length of 30 mm.

[0161] The cellulose fiber wrapped in cotton fiber described in step S4.

[0162] The cellulose fibers described in step S4 have a fineness of 1.5-4.5 tex and a length of 30 mm.

[0163] In step S4, the mass ratio of the core-sheath PLA / PBS composite short fibers to cellulose fibers is 7:3.

[0164] The web formation described in step S4 is achieved using airflow with an airflow intensity of 0.8 m / s.

[0165] In step S4, the hydroentangling pressure is 100 bar, the hydroentangling is performed twice, and the speed of the fiber web passing through the hydroentangling machine is 10 m / min; the drying is carried out by hot air drying at a temperature of 80°C.

[0166] The samples prepared in the above embodiments and comparative examples were subjected to the following tests:

[0167] 1. Tensile strength test: GB / T 24218.2-2018 "Textiles - Nonwovens - Test methods - Part 2: Determination of breaking strength and elongation at break"

[0168] Testing method: Tensile testing is performed using a tensile testing machine. Sampling: Standard size (50mm wide specimen). Testing speed: 300mm / min. Testing direction: Both longitudinal and transverse directions are tested.

[0169] Test results: Record the maximum tensile strength (N) and the corresponding elongation at break (%).

[0170] 2. Tear strength test: GB / T 3917.3-2009 "Textiles - Tear Properties of Fabrics - Part 3: Single-Latch Tear Test"

[0171] Testing method: Using an Elmendorf tear strength tester. Sampling: Standard size (100mm x 63mm specimen). Testing direction: Both longitudinal and transverse directions are tested.

[0172] Test results: Record the tear strength (N).

[0173] 3. Ultrasonic welding strength test: GB / T 24218.3-2018 "Textiles - Test Methods for Nonwoven Fabrics - Part 3: Determination of Ultrasonic Welding Strength"

[0174] Testing Method: Ultrasonic welding strength tester. Sampling: Place the cut non-woven fabric sample (25mm wide) in the welding area of ​​the ultrasonic welding machine according to the standard size. Ensure that the two samples are stacked on top of each other and the contact surfaces are neatly aligned. Start the ultrasonic welding machine, causing the two layers of non-woven fabric to generate heat through high-frequency vibration to achieve the welding effect. The frequency is 30kHz, and the welding time is 1 second. After welding, allow the sample to cool to room temperature to ensure that the adhesive strength of the welded area reaches a stable state. Testing Speed: 300mm / min.

[0175] Test results: Record the maximum weld strength (N / 25mm). The test results are shown in Table 1.

[0176]

[0177] In existing technologies, PPE is mainly used as a flame retardant to modify and improve the flame retardant properties of materials, while TBC improves the flexibility and processing properties of materials through plasticizing modification. There are no reports of applying either of these to PBS to improve material properties. In this invention, as shown in the above results, the specific formulation provided by this invention effectively suppresses the pilling phenomenon of nonwoven fabrics and significantly improves the mechanical properties of nonwoven fabrics. PPE may form hydrogen bonds or ionic bonds with the hydroxyl or carboxyl groups on the PBS molecular chain through its phosphate ester groups, thereby enhancing the intermolecular interaction forces, making the overall structure of the composite material more compact, and thus improving tensile strength and tear strength. PPE may also act as a nucleating agent, promoting the crystallization of PBS and forming a more complete crystal structure, which also helps to improve the strength and toughness of the material. TBC, as a plasticizer, may insert into the PBS molecular chains, increasing the mobility of chain segments, thereby reducing the rigidity of the material to a certain extent and improving its flexibility. However, in this composite system, an appropriate amount of TBC may reduce inter-fiber friction and wear through its intermolecular lubrication, thereby reducing burr formation. TBC may also promote the compatibility between PBS and PLA to some extent, making the core-sheath structure more stable, reducing interfacial defects, and thus improving the overall performance of the composite fiber. The addition of PPE and TBC may improve the surface properties of PBS, making it easier to form a strong bond with other materials during ultrasonic welding. In particular, the phosphate ester groups of PPE may enhance the interfacial interaction forces, while the plasticizing effect of TBC may help to achieve a tight fit at the welding interface. The core-sheath structure of the composite fiber may also contribute to the ultrasonic welding strength. PLA as the core layer may provide good rigidity and wear resistance, while PBS as the sheath layer provides good flexibility and processability. This structure may more easily form a uniform welding interface during ultrasonic welding, thereby improving the welding strength.

[0178] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

[0179] The present invention and its embodiments have been described above. This description is not restrictive, but merely one embodiment of the present invention, and the actual application is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar methods and embodiments without departing from the spirit of the present invention, they should all fall within the protection scope of the present invention.

Claims

1. A method for preparing a biodegradable, anti-pilling, spunlace nonwoven fabric that can be ultrasonically bonded, characterized in that: Includes the following steps: S1. Take low-melting-point polybutylene succinate, polyphosphate ester, and high-melting-point polylactic acid granules and dry them. S2. Mix low-melting-point polybutylene succinate, polyphosphate, and tributyl citrate evenly to obtain material A. S3. Material A and high-melting-point polylactic acid are melted separately by two screws of a two-component spinning machine. The two melts are spun through a core-sheath spinning assembly to obtain core-sheath PLA / PBS composite fiber, wherein the sheath is low-melting-point polybutylene succinate and the core is high-melting-point PLA. S4. The obtained sheath-core PLA / PBS composite fibers are dried and then cut into sheath-core PLA / PBS composite short fibers. The obtained PLA / PBS composite short fibers were mixed with cellulose fibers and then formed into a web using a web forming machine to obtain a fiber web. The obtained fiber web was then treated by a high-pressure hydroentangling machine to obtain a hydroentangled fiber web. After drying, a biodegradable anti-pilling hydroentangled nonwoven fabric was obtained. In material A mentioned in step S2, the mass ratio of low-melting-point polybutylene succinate to polyphosphate and tributyl citrate is (80-100):(10-15):(3-5); in step S4, the web is formed by airflow with an airflow intensity of 0.5-1.0 m / s; in step S4, the hydroentangling is performed at a pressure of 80-150 bar, with 2-4 hydroentangling cycles, and the fiber web passes through the hydroentangling machine at a speed of 10-30 m / min; the drying is performed by hot air drying at a temperature of 80-100℃. In step S3, the mass ratio of high-melting-point polylactic acid to low-melting-point polybutylene succinate in material A is (10-90):(10-90); the melting temperature of material A in step S3 is controlled at 110-135℃; the melting temperature of the high-melting-point polylactic acid is controlled at 160-180℃; in step S3, the spinning temperature is 155-170℃, the winding speed is 700-1300m / min, the drawing temperature is 60-90℃, and the drawing ratio is 2.5-4.5 times; the cellulose fiber in step S4 includes viscose fiber, One or more of cotton, linen, and bamboo fiber; the cellulose fiber in step S4 has a length of 30-50 mm; the mass ratio of the sheath-core PLA / PBS composite short fiber to the cellulose fiber in step S4 is (1.25-7):(3-5); the drying in step S4 is carried out by hot air drying at 80-130℃, and the sheath-core PLA / PBS composite short fiber has a length of 3-100 mm; the low-melting-point polybutylene succinate in step S1 has a melting point of 105-130℃, and the high-melting-point polylactic acid has a melting point of 155℃-175℃.

2. The method for preparing ultrasonically bondable, biodegradable, anti-pilling, spunlace nonwoven fabric according to claim 1, characterized in that: The drying process described in step S1 involves vacuum drying at 45-65°C for 8-12 hours. After drying, the moisture content of the low-melting-point polybutylene succinate, polyphosphate, and high-melting-point polylactic acid granules is less than 50 ppm.

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