High-strength super-soft non-woven fabric and preparation method thereof

Abstract

The invention relates to the technical field of non-woven fabrics, in particular to a high-strength super-soft non-woven fabric and a preparation method thereof.The high-strength super-soft non-woven fabric is prepared from, by weight, 5%-15% of polyether sulfone, 2%-5% of compatilizer, 1%-3% of softening agent and the balance polypropylene resin; the preparation method of the polyarylether sulfone comprises the following steps: adding 4, 4 '-difluorodiphenyl sulfone, bisphenol fluorene, hydroxyl-terminated hyperbranched polyester and a catalyst into a solvent, taking xylene as a dehydrating agent, and stirring until the materials are dissolved; refluxing at the temperature of 165-175 DEG C to form salt; then heating the reaction system to 180-210 DEG C, continuously stirring and reacting, and removing the solvent after the reaction is finished, so as to obtain polyarylether sulfone; the total molar weight of the bisphenol fluorene and the hydroxyl-terminated hyperbranched polyester is the same as that of the 4, 4 '-difluorodiphenyl sulfone; the method has the advantage of improving the strength of the super-soft non-woven fabric.

Description

Technical Field

[0001] The present application relates to the technical field of non-woven fabrics, and in particular to a high-strength super-soft non-woven fabric and a preparation method thereof. Background Art

[0002] With the development of society and the continuous progress of science and technology, the application scope of non-woven fabrics is getting wider and wider, the variety is getting more and more, and the performance requirements for non-woven fabrics are getting higher and higher. In the current market, the surface layer materials of products such as sanitary napkins, pantiliners, disposable diapers, and baby diapers in disposable hygiene products are all made of non-woven fabrics. For such non-woven fabrics, in addition to permeability and absorbency, their softness and comfort are very important. However, in related technologies, the strength of non-woven fabrics is often ignored. Although their softness is improved, insufficient strength still reduces their usage potential. For example, in the use of baby diapers, if the strength is insufficient, it is easy to cause damage and leakage during wearing or children's activities. Summary of the Invention

[0003] In order to improve the strength of super-soft non-woven fabrics, the present application provides a high-strength super-soft non-woven fabric and a preparation method thereof.

[0004] In a first aspect, the present application provides a high-strength super-soft non-woven fabric, adopting the following technical solution: A high-strength super-soft non-woven fabric, which comprises raw materials with the following weight percentages: 5-15% of polyarylether sulfone, 2-5% of compatibilizer, 1-3% of softener, and the balance is polypropylene resin; The preparation method of the polyarylether sulfone is as follows: In a solvent, 4,4'-difluorodiphenyl sulfone, bisphenol fluorene, hydroxyl-terminated hyperbranched polyester and a catalyst are added, xylene is used as a dehydrating agent, and stirred until dissolved; refluxed at 165-175 °C for salt formation; then the reaction system is heated to 180-210 °C, and stirring reaction is continued. After the reaction is completed, the solvent is removed to obtain polyarylether sulfone; the total molar amount of the bisphenol fluorene and the hydroxyl-terminated hyperbranched polyester is the same as that of the 4,4'-difluorodiphenyl sulfone.

[0005] By adopting the above technical solution, polyarylether sulfone resin generally refers to a class of high molecular polymers whose main chain is composed of sulfone groups, arylene groups and ether bonds. As a plastic, it can utilize the conjugation between its molecules, that is, the van der Waals forces between benzene rings, between sulfone groups and benzene rings, etc., to endow the material with excellent rigidity and hardness. Adding it to non-woven fabrics can greatly improve the strength of non-woven fabrics, but at the same time reduce the softness of non-woven fabrics. The inventor of this application designed the molecular structure of polyarylether sulfone, introduced hyperbranched molecules into its molecular structure, and the hydroxyl groups in the hyperbranched polyester with terminal hydroxyl groups and the hydroxyl groups on bisphenol fluorene both replaced the fluorine atoms in 4,4'-difluorodiphenyl sulfone, and then polycondensation was carried out to obtain polyarylether sulfone containing hyperbranched structure, which can greatly reduce the conjugation within the polyarylether sulfone molecule and is more conducive to the conjugation between its molecules, thereby greatly reducing the rigidity of polyarylether sulfone. And the inventor of this application found that when hyperbranched molecules are introduced into polyarylether sulfone and added to non-woven fabrics, the softness of non-woven fabrics is reduced instead. It is speculated that because hyperbranched molecules are not easy to agglomerate, which is conducive to the dispersion of polyarylether sulfone in the non-woven fabric system, and can be fully combined with polypropylene resin, disrupting the orderly arrangement of polypropylene resin to a certain extent, thus reducing the macroscopic softness of non-woven fabrics, offsetting the problem of reduced softness of non-woven fabrics caused by polyarylether sulfone, and at the same time improving the strength of non-woven fabrics.

[0006] Preferably, the molar ratio of the bisphenol fluorene to the hyperbranched polyester with terminal hydroxyl groups is (2-4):1.

[0007] By adopting the above technical solution, the addition amount of the hyperbranched polyester with terminal hydroxyl groups should not be too large or too small, and within this range, non-woven fabrics can have excellent softness and strength.

[0008] Preferably, the average molecular weight of the hyperbranched polyester with terminal hydroxyl groups ranges from 500 to 2400.

[0009] By adopting the above technical solution, the molecular weight of the hyperbranched polyester with terminal hydroxyl groups should not be too large or too small. If the molecular weight is too small, it is not conducive to exerting its function. If the molecular weight is too large, it contains more branched chains and a large amount of terminal hydrogen bonds, which can act as a cross-linking agent during the reaction; after adding polyarylether sulfone to non-woven fabrics, it is not easy to disperse and cannot achieve the expected effect instead.

[0010] Preferably, the weight percentage content of the added polyarylether sulfone is 10%.

[0011] By adopting the above technical solution, when the addition amount of polyarylether sulfone is small, its softness and breaking strength both decrease. When its addition amount is too large, its rigidity gradually becomes obvious. It is considered that due to the excessive addition amount, the conjugation between molecules is strengthened, making its rigidity more obvious. When the addition amount is 10%, the non-woven fabric obtained has the best comprehensive performance.

[0012] Preferably, the catalyst is anhydrous potassium carbonate.

[0013] By adopting the above technical solution, anhydrous potassium carbonate has a good catalytic effect and is cheaper in price.

[0014] Preferably, the solvent is a mixed solution of N,N-dimethylformamide and sulfolane with a volume ratio of 1:1.

[0015] By adopting the above technical solution, the mixed solution of N,N-dimethylformamide and sulfolane can dissolve the reactants well and make the reaction more complete.

[0016] Preferably, the method for removing the solvent is as follows: after adding n-butanol with a volume of one-fifteenth to one-eighth of the solvent volume to the reaction solution, perform reduced pressure distillation to remove the solvent.

[0017] By adopting the above technical solution, adding n-butanol can enhance the azeotropic effect of the system, remove the solvent faster, and save energy.

[0018] In a second aspect, the present application provides a method for preparing a high-strength super-soft non-woven fabric, adopting the following technical solution: A method for preparing a high-strength super-soft non-woven fabric, which comprises the following steps: S1. Stir and mix the raw materials at a stirring speed of 180 - 220 r / min, mix at room temperature for 5 - 15 min, and then stir at a rotation speed of 800 - 1200 r / min for 6 - 15 min to obtain a mixed material; S2. Transfer the mixed material obtained in S1 to a screw extruder, and the temperatures of the screw extruder are: 160 °C in zone 1, 200 °C in zone 2, 215 °C in zone 3, 220 °C in zone 4, 230 °C in zone 5, and 240 °C in zone 6, and obtain a molten slurry through melt extrusion; S3. Filter the molten slurry obtained in S2 through a filter with a heating temperature of 230 - 250 °C, then measure it with a metering pump with a heating temperature of 230 - 250 °C and transfer it to a spinning box. The temperature in the spinning box is 230 - 250 °C, and then perform spinning. The monomer suction flow rate is 4000 - 4200 m 3 / min, the spinning temperature is 220 - 240 °C, the cooling air blowing temperature is 20 - 45 °C, obtain fiber filaments through air cooling and stretching, and uniformly adsorb the fiber filaments onto a conveyor belt to form a fiber web; S4. Hot-roll the fiber web in S3 with a hot-rolling machine to obtain a high-strength super-soft non-woven fabric; among them, the parameters of the hot-rolling machine are controlled as follows: the hot-rolling machine pressure is 4 - 6 N, the suction air volume is 600 - 800 r / min, the cold air volume is 600 - 800 r / min, the temperature of the upper roller is 160 - 180 °C, and the temperature of the lower roller is 150 - 170 °C.

[0019] By adopting the above technical solution, after adding polyarylethersulfone to the present application, its processing temperature requires a higher temperature than that of the polypropylene resin system. By designing its temperature and other process parameters, non-woven fabrics with the same technical effects as those of the present application can be prepared, and their qualification rates are relatively high, all being above 98.1%.

[0020] In summary, the present application includes at least one of the following beneficial technical effects: 1. Polyarylethersulfone resin generally refers to a class of high molecular polymers whose main chain is composed of sulfone groups, arylene groups and ether bonds. As a plastic, it can utilize the conjugation between its molecules, that is, the van der Waals forces between benzene rings and between sulfone groups and benzene rings, etc., to endow the material with excellent rigidity and hardness. Adding it to non-woven fabrics can greatly improve the strength of non-woven fabrics, but at the same time, it will reduce the softness of non-woven fabrics. The inventor of the present application designed the molecular structure of polyarylethersulfone and introduced hyperbranched molecules into its molecular structure, which can greatly reduce the conjugation within the polyarylethersulfone molecule and is more conducive to the conjugation between its molecules, thereby greatly reducing the rigidity of polyarylethersulfone. And the inventor of the present application found that introducing hyperbranched molecules into polyarylethersulfone and adding it to non-woven fabrics actually reduces the softness of non-woven fabrics. It is speculated that because hyperbranched molecules are not easy to agglomerate, it is beneficial to the dispersion of polyarylethersulfone in the non-woven fabric system, and it can be fully combined with polypropylene resin, disrupting the orderly arrangement of polypropylene resin to a certain extent, thereby reducing the macroscopic softness of non-woven fabrics, thus offsetting the problem of reduced softness of non-woven fabrics brought by polyarylethersulfone.

[0021] 2. The softness of the high-strength super-soft non-woven fabric prepared in the present application is all 10.1 mN and below, and the lowest can reach 8.2 mN. At the same time, its transverse breaking strength is all between 32.0 - 45.3 N, and its longitudinal breaking strength is all between 36.9 - 50.1 N; this shows that the non-woven fabric prepared in the present application has excellent softness and excellent strength, greatly improving the application potential of non-woven fabrics. Detailed Embodiments

[0022] The following further elaborates on the present application in detail in combination with specific content.

[0023] Raw Materials The raw materials of the present application are all purchased commercially. Among them, hydrogen-terminated phenyl silicone oil is purchased from Henan Lavoisier Chemical Products Co., Ltd., with a viscosity of 25 °C, 6 mm 2 / s; the softener is amino-terminated phenyl silicone oil, with a model of HCY-118 and a manufacturer of Guangzhou Haochangyue Chemical Technology Co., Ltd.; the processing grade of polypropylene resin is injection molding grade.

[0024] Preparation Examples Preparation Example 1 A polyarylether sulfone, and its preparation method is as follows: In a mixed solution of 500 g of N,N-dimethylformamide and sulfolane with a volume ratio of 1:1, add 0.4 mol of 4,4'-difluorodiphenyl sulfone, bisphenol fluorene, hydroxyl-terminated hyperbranched polyester, and 0.5 mol of anhydrous potassium carbonate, then add 100 g of xylene as a dehydrating agent, and stir until dissolved; then, under a nitrogen atmosphere, install a water separator, heat up to 170 °C, and reflux for 2.5 h to carry out a sufficient salt-forming reaction; then raise the temperature of the reaction system to 200 °C and stir for 7 h; the total molar amount of bisphenol fluorene and hydroxyl-terminated hyperbranched polyester is 0.4 mol, and the molar ratio of bisphenol fluorene to hydroxyl-terminated hyperbranched polyester is 3:1; the model of the hydroxyl-terminated hyperbranched polyester is HyPer H101, and its average molecular weight is 500. When calculating its molar amount, calculate according to its average molecular weight; add 50 g of n-butanol to the reaction solution, then distill under reduced pressure to remove the solvent to obtain polyarylether sulfone. After GPC detection, its average molecular weight (number-average molecular weight) is between 91,000, and the molecular weight distribution is 1.71.

[0025] Preparation Example 2 A polyarylether sulfone, different from Preparation Example 1 in that the model of its hydroxyl-terminated hyperbranched polyester is HyPerH102, and its average molecular weight is 1100. If the temperature is too low at room temperature during operation and it is difficult to dissolve the reactants, a reaction solvent can be added to make it just completely dissolved, and the remaining steps are the same as those in Preparation Example 1; the average molecular weight and its distribution of the prepared polyarylether sulfone are 92,000, and the molecular weight distribution is 1.73.

[0026] Preparation Example 3 A polyarylether sulfone, different from Preparation Example 1 in that the model of its hydroxyl-terminated hyperbranched polyester is HyPerH103, and its average molecular weight is 2400. If the temperature is too low at room temperature during operation and it is difficult to dissolve the reactants, a reaction solvent can be added to make it just completely dissolved, and the remaining steps are the same as those in Preparation Example 1; the average molecular weight and its distribution of the prepared polyarylether sulfone are 94,000, and the molecular weight distribution is 1.69.

[0027] Preparation Example 4 A polyarylether sulfone, different from Preparation Example 2 in that the molar ratio of bisphenol fluorene to hydroxyl-terminated hyperbranched polyester is 2:1, and the remaining steps are the same as those in Preparation Example 2; the average molecular weight and its distribution of the prepared polyarylether sulfone are 82,000, and the molecular weight distribution is 1.63.

[0028] Preparation Example 5 A polyarylether sulfone, different from Preparation Example 2 in that the molar ratio of bisphenol fluorene to hydroxyl-terminated hyperbranched polyester is 4:1, and the remaining steps are the same as those in Preparation Example 2; the average molecular weight and its distribution of the prepared polyarylether sulfone are 74,000, and the molecular weight distribution is 1.70. Example

[0029] Example 1 A high-strength and super-flexible non-woven fabric, the raw materials and their dosages are shown in Table 1, and its preparation method is as follows: S1. Weigh each raw material according to the dosage in Table 1, then stir and mix them. The stirring speed is 200 r / min, and mix at room temperature for 10 min, then stir at a speed of 1000 r / min for 10 min to obtain a mixed material; among them, polyarylether sulfone comes from Preparation Example 1; the compatibilizer is hydrogen-terminated phenyl silicone oil; S2. Transfer the mixed material obtained in S1 to a screw extruder. The temperatures of the screw extruder are as follows: Zone 1 is 160 °C, Zone 2 is 200 °C, Zone 3 is 215 °C, Zone 4 is 220 °C, Zone 5 is 230 °C, and Zone 6 is 240 °C. After melting and extrusion, a molten slurry is obtained; S3. Filter the molten slurry obtained in S2 through a filter with a heating temperature of 240 °C, and then transfer it to the spinning box after metering by a metering pump with a heating temperature of 240 °C. The temperature in the spinning box is 240 °C, and then carry out spinning. The monomer suction flow rate is 4100 m 3 / min, the spinning temperature is 230 °C, the cooling air blowing temperature is 30 °C, and fiber filaments are obtained by air cooling and stretching. The fiber filaments are evenly adsorbed onto the conveyor belt to form a fiber web; S4. Hot-roll the fiber web in S3 by a hot-rolling machine to obtain a high-strength and super-flexible non-woven fabric; among them, the parameters of the hot-rolling machine are controlled as follows: the pressure of the hot-rolling machine is 5 N, the suction air volume is 700 r / min, the cold air volume is 700 r / min, the temperature of the upper roller is 170 °C, and the temperature of the lower roller is 160 °C.

[0030] Table 1 Raw materials and their dosages (kg) of Example 1 Polypropylene resin 85 Polyarylethersulfone 10 Compatibilizer 3.5 Softener 1.5 Example 2 A high-strength and super-flexible non-woven fabric, which is different from Example 1 in that its polyarylether sulfone comes from Preparation Example 2, and the remaining steps are the same as those in Example 1.

[0031] Example 3 A high-strength and super-flexible non-woven fabric, which is different from Example 1 in that its polyarylether sulfone comes from Preparation Example 3, and the remaining steps are the same as those in Example 1.

[0032] Example 4 A high-strength and super-flexible non-woven fabric, which is different from Example 1 in that its polyarylether sulfone comes from Preparation Example 4, and the remaining steps are the same as those in Example 1.

[0033] Example 5 A high-strength and super-flexible non-woven fabric, which is different from that of Example 1 in that its polyarylether sulfone is from Preparation Example 5, and the remaining steps are the same as those of Example 1.

[0034] Example 6 A high-strength and super-flexible non-woven fabric, which is different from that of Example 2 in that the addition amount of its polyarylether sulfone is 5 kg and the addition amount of polypropylene resin is 90 kg, and the remaining steps are the same as those of Example 2.

[0035] Example 7 A high-strength and super-flexible non-woven fabric, which is different from that of Example 2 in that the addition amount of its polyarylether sulfone is 15 kg and the addition amount of polypropylene resin is 80 kg, and the remaining steps are the same as those of Example 2.

[0036] Comparative Example Comparative Example 1 A high-strength and super-flexible non-woven fabric, which is different from that of Example 2 in that its polyarylether sulfone is replaced with polypropylene resin of equal mass, and the remaining steps are the same as those of Example 2.

[0037] Comparative Example 2 A high-strength and super-flexible non-woven fabric, which is different from that of Example 2 in that when preparing its polyarylether sulfone, the hydroxyl-terminated hyperbranched polyester is replaced with an equimolar amount of bisphenol fluorene, and the remaining steps are the same as those of Example 2.

[0038] Comparative Example 3 A high-strength and super-flexible non-woven fabric, which is different from that of Example 2 in that its compatibilizer is replaced with polypropylene resin of equal mass, and the remaining steps are the same as those of Example 2.

[0039] Performance Detection Test Detection Method / Test Method Prepare high-loudness super-flexible non-woven fabrics according to the preparation methods of Examples 1-7 and Comparative Examples 1-3 respectively, and then detect them according to the following detection methods. The detection results are shown in Table 2.

[0040] Softness: Detect according to the detection method of EDANA WSP 90.3.(05), and the number of layers is 1 layer during detection; Tensile strength: Determine according to the standard for the determination of the tensile strength of non-woven fabrics FZ / T6005-91, and use a YG065 type electronic fabric strength tester for determination. The specimen size is 50 mm×200 mm; The greater the tensile strength, the better the mechanical properties. Heavy metal content: Detect according to the standard of GB / T9758-1988. Through detection, no heavy metals such as Cd, Pb, Hg, Cr, etc. were detected in the non-woven fabrics of Examples 1-7 and Comparative Examples 1-2 of this application.

[0041] Table 2 Detection Results of Examples 1-7 and Comparative Examples 1-3 From Examples 1-7, Comparative Examples 1-2, and the detection data in Table 2, it can be seen that the softness of the high-strength super-soft non-woven fabric prepared in this application is all 10.1 mN or less, and the lowest can reach 8.2 mN. At the same time, its transverse breaking strength is between 32.0 - 45.3 N, and its longitudinal breaking strength is between 36.9 - 50.1 N. This shows that the non-woven fabric prepared in this application has excellent softness and excellent strength, greatly improving the application potential of the non-woven fabric.

[0042] Polyarylether sulfone resin generally refers to a class of high molecular polymers whose main chain is composed of sulfone groups, arylene groups, and ether bonds. As a plastic, it can utilize the conjugation between its molecules, that is, the van der Waals forces between benzene rings and between sulfone groups and benzene rings, to endow the material with excellent stiffness and hardness. Adding it to the non-woven fabric can greatly improve the strength of the non-woven fabric, but at the same time, it will reduce the softness of the non-woven fabric. The inventors of this application designed the molecular structure of polyarylether sulfone and introduced hyperbranched molecules into its molecular structure, which can greatly reduce the conjugation within the polyarylether sulfone molecule and is more conducive to the conjugation between its molecules, thereby greatly reducing the rigidity of polyarylether sulfone. And the inventors of this application found that when hyperbranched molecules are introduced into polyarylether sulfone and added to the non-woven fabric, the softness of the non-woven fabric is instead reduced. It is speculated that because hyperbranched molecules are not easy to agglomerate, which is conducive to the dispersion of polyarylether sulfone in the non-woven fabric system and can be fully combined with polypropylene resin, disrupting the orderly arrangement of polypropylene resin to a certain extent, thus reducing the softness of the non-woven fabric macroscopically. This can be verified by the detection data of Example 2 and Comparative Examples 1-2. Combining with Comparative Example 3, by adding a compatibilizer, the compatibility between polyarylether sulfone and the system can also be greatly improved, and the addition of the compatibilizer further reduces the softness of the non-woven fabric, further offsetting the increase in the rigidity of the non-woven fabric brought by polyarylether sulfone.

[0043] From the detection data of Examples 1-3, it can be seen that the molecular weight of the hydroxyl-terminated hyperbranched polyester should not be too large or too small. If the molecular weight is too small, it is not conducive to playing its role. If the molecular weight is too large, it contains more branches and a larger content of terminal hydrogen bonds, which can act as a cross-linking agent during the reaction; when polyarylether sulfone is added to the non-woven fabric, it is not easy to disperse and cannot achieve the expected effect. By the same principle, combining Examples 4-5, the addition amount of the hydroxyl-terminated hyperbranched polyester should also not be too large or too small.

[0044] From the test data of Example 2 and Examples 6-7, it can be seen that when the addition amount of polyarylether sulfone is small, its softness and breaking strength both decrease. When its addition amount is too large, its rigidity gradually becomes obvious. It is considered that due to the too large addition amount, the conjugation between molecules is strengthened, thus making its rigidity more obvious.

[0045] This specific embodiment is only an explanation of the present invention, and it is not a limitation of the present invention. After reading this specification, those skilled in the art can make modifications to this embodiment without creative contributions as needed, but as long as it is within the scope of the claims of the present invention, it is protected by the patent law.

Claims

1. A high-strength and ultra-flexible non-woven fabric, characterized in that: It comprises raw materials with the following weight percentages: 5-15% of polyarylether sulfone, 2-5% of compatibilizer, 1-3% of softener, and the balance is polypropylene resin; The preparation method of the polyarylether sulfone is as follows: In a solvent, 4,4'-difluorodiphenyl sulfone, bisphenol fluorene, hydroxyl-terminated hyperbranched polyester and a catalyst are added, and xylene is used as a dehydrating agent, and stirred until dissolved; refluxed at 165-175 °C for salt formation; then the reaction system is heated to 180-210 °C, and stirring reaction is continued. After the reaction is completed, the solvent is removed to obtain polyarylether sulfone; the total molar amount of the bisphenol fluorene and the hydroxyl-terminated hyperbranched polyester is the same as that of the 4,4'-difluorodiphenyl sulfone.

2. The high-strength and super-flexible non-woven fabric according to claim 1, characterized in that: The molar ratio of the bisphenol fluorene to the hydroxyl-terminated hyperbranched polyester is (2-4):

1.

3. The high-strength and super-flexible non-woven fabric according to claim 1, wherein: The range of the average molecular weight of the hydroxyl-terminated hyperbranched polyester is 500-2400.

4. A high-strength and super-flexible non-woven fabric according to claim 1, characterized in that: The added weight percentage of the polyarylether sulfone is 10%.

5. The high-strength and ultra-flexible non-woven fabric according to claim 1, wherein: The catalyst is anhydrous potassium carbonate.

6. The high-strength and super-flexible non-woven fabric according to claim 1, characterized in that: The solvent is a mixed solution of N,N-dimethylformamide and sulfolane with a volume ratio of 1:

1.

7. The high-strength and super-flexible non-woven fabric according to claim 1, characterized in that: The method for removing the solvent is as follows: After adding n-butanol with a volume of one-fifteenth to one-eighth of the solvent volume to the reaction solution, vacuum distillation is carried out to remove the solvent.

8. A method for preparing the high-strength super-flexible non-woven fabric according to any one of claims 1-7, characterized in that: It comprises the following steps: S1. Stir and mix the raw materials at a stirring speed of 180-220 r / min, mix at room temperature for 5-15 min, and then stir at a rotation speed of 800-1200 r / min for 6-15 min to obtain a mixed material; S2. Transfer the mixed material prepared in S1 to a screw extruder. The temperatures of the screw extruder are: zone 1 at 160 °C, zone 2 at 200 °C, zone 3 at 215 °C, zone 4 at 220 °C, zone 5 at 230 °C, and zone 6 at 240 °C, and melt extrusion is carried out to obtain a molten slurry; S3. Filter the molten slurry prepared in S2 through a filter with a heating temperature of 230 - 250°C, then transfer it to the spinning box after metering by a metering pump with a heating temperature of 230 - 250°C. The temperature in the spinning box is 230 - 250°C, and then carry out spinning. The monomer suction flow rate is 4000 - 4200 m 3 / min, the spinning temperature is 220 - 240°C, the cooling air blowing temperature is 20 - 45°C, and fiber filaments are obtained through air cooling and stretching. The fiber filaments are evenly adsorbed onto the conveyor belt to form a fiber web; S4. Hot-roll the fiber web of S3 by a hot-rolling machine to obtain a high-strength and super-soft non-woven fabric; wherein, the parameters of the hot-rolling machine are controlled as follows: the pressure of the hot-rolling machine is 4-6 N, the air suction volume is 600-800 r / min, the cold air volume is 600-800 r / min, the temperature of the upper roller is 160-180 °C, and the temperature of the lower roller is 150-170 °C.

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