High-toughness non-woven fabric and preparation method thereof

Abstract

The invention relates to the technical field of non-woven fabrics, in particular to a high-toughness non-woven fabric and a preparation method thereof.The high-toughness non-woven fabric is prepared from, by weight, 90-110 parts of polypropylene resin, 20-40 parts of polyether sulfone, 1-3 parts of softening agent and 0.3-1.2 parts of antioxidant; the polyether sulphone is prepared by reaction of 4, 4 '-difluorodiphenyl sulfone, micromolecular bisphenol and hydroxyl silicone oil; the non-woven fabric has the advantages that the toughness is improved while the strength of the non-woven fabric is considered.

Description

Technical Field

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

[0002] Non-woven fabrics, also known as nonwovens, are composed of oriented or random fibers and are called cloth because they resemble cloth and possess certain properties. Non-woven fabrics lack warp and weft threads and do not require spinning or weaving. They are widely used in various industries because they are easy to cut and sew, lightweight, and easily shaped. Compared to woven fabrics, non-woven fabrics tend to be weaker. To increase their strength and enhance their potential, research has explored methods such as adding inorganic particles. However, while increasing their strength, this often reduces their toughness, making them hard and brittle, making them difficult to meet practical application requirements. Summary of the Invention

[0003] In order to improve the toughness of non-woven fabrics while taking into account their strength, the present application provides a high-toughness non-woven fabric and a preparation method thereof.

[0004] In the first aspect, the present application provides a high-tenacity non-woven fabric, which adopts the following technical solution: A high-toughness non-woven fabric comprises the following raw materials in parts by weight: 90-110 parts of polypropylene resin, 20-40 parts of polyarylethersulfone, 1-3 parts of softener and 0.3-1.2 parts of antioxidant; The polyarylethersulfone is prepared by reacting 4,4'-difluorodiphenylsulfone, small molecule bisphenol and double-terminated hydroxyl silicone oil.

[0005] By adopting the above technical solution, the present application adds polyarylethersulfone, makes polypropylene resin and polyarylethersulfone melt blend, utilizes the high strength and high toughness of polyarylethersulfone, and improves the strength and toughness of non-woven fabric.The melting point of polyarylethersulfone itself is higher, and due to the similar compatibility principle, its compatibility with polypropylene resin is poor.If ordinary polyarylethersulfone is blended with polypropylene resin, it is at the temperature at which polypropylene resin melts, then polyarylethersulfone cannot be melted, so that it cannot achieve the technical effect of the present application, and its improvement amplitude on the strength and toughness of non-woven fabric is small.The polyarylethersulfone prepared by the present application has double-terminal hydroxyl silicone oil added to its molecular structure, and the silicone oil segment can relax the rigidity of polyarylethersulfone, improve its toughness, and find that the silicone oil segment can reduce the conjugated performance between the aromatic group in the polyarylethersulfone molecule, thereby making its melting temperature significantly reduce, improve its processing properties.And the silicone oil segment makes the compatibility between polypropylene resin and polyarylethersulfone better. Under the preparation method designed in this application, the strength and toughness of the non-woven fabric produced are greatly improved.

[0006] As a preference: the preparation method of the polyarylethersulfone is as follows: A mixed solution of N,N-dimethylformamide and sulfolane is used as a reaction solvent, 4,4'-difluorodiphenyl sulfone, small molecule bisphenol, dihydroxy-terminated silicone oil and anhydrous potassium carbonate are added, xylene is used as a dehydrating agent, a water separator is installed under a nitrogen atmosphere, the temperature is raised to 150-175°C, and a reflux reaction is carried out; the reaction system is then heated to 180-205°C and stirred for reaction; the total molar amount of bisphenol A and dihydroxy-terminated silicone oil is the same as that of the 4,4'-difluorodiphenyl sulfone; and the solvent is removed to obtain polyarylethersulfone.

[0007] By adopting the above technical solution, the phenolic hydroxyl groups in the small molecule bisphenol and the hydroxyl groups in the double-terminated hydroxyl silicone oil undergo nucleophilic substitution for the fluorine atoms in 4,4'-difluorodiphenyl sulfone, thereby undergoing a polymerization reaction to prepare polyarylethersulfone.

[0008] Preferably, the molar ratio of the small molecule bisphenol to the dihydroxy-terminated silicone oil is (1-3):1.

[0009] By adopting the above technical solution, when the molar ratio of small molecule bisphenol and dihydroxyl silicone oil is within this range, the comprehensive improvement of the strength and toughness of the non-woven fabric by polyarylethersulfone is better.

[0010] Preferably, the small molecule bisphenol is one or more of bisphenol A, bisphenol Z, and biphenol.

[0011] By adopting the above technical solution, when small molecule bisphenols are selected within this range, polyarylethersulfones with similar molecular structures can be prepared. Although not tested one by one in the examples of this application, in theory, similar technical effects as those of this application can be achieved.

[0012] Preferably, the molecular weight of the dihydroxy-terminated silicone oil is 1000-5000.

[0013] By adopting the above technical solution, the molecular weight of the bihydroxyl silicone oil has a significant impact on the performance of the non-woven fabric. It is speculated that this is because it affects the compatibility between polypropylene resin and polyarylethersulfone. Therefore, the molecular weight of the bihydroxyl silicone oil should not exceed this range.

[0014] Preferably, the added amount of the polyarylethersulfone is 30 parts by weight.

[0015] When the amount of polyarylethersulfone added exceeds 30 parts by weight, the performance of the nonwoven fabric is only slightly improved due to compatibility issues between the polyarylethersulfone and the polypropylene resin.

[0016] Preferably, the softener is amino-terminated phenyl silicone oil.

[0017] By adopting the above technical solution, the amino-terminated phenyl silicone oil can utilize its siloxy bond and polar bond to further improve the compatibility of polyarylethersulfone and polypropylene resin.

[0018] In a second aspect, the present application provides a method that employs the following technical solutions: A method for preparing a high-tenacity non-woven fabric comprises the following steps: S1. Preparation of fiber filaments: extruding and melting polypropylene resin, polypropylene resin, polyarylethersulfone, softener and phenolic antioxidant at 185-195° C., spinning at a flow rate of 0.4-0.7 g / min, and cooling to room temperature to obtain fiber filaments; S2, preparation of fiber web: opening and combing the fiber filaments prepared in S1, and then laying them into a fiber web; S3, preparation of non-woven fabric: the fiber mesh prepared in S2 is 80-120 needles / cm 2 Needle punching is performed at a density of 250-350 needles / cm 2 Needle punching is performed at a density of 750-850 needles / cm 2 Needle punching is performed at a density of 1000 to obtain a high-strength non-woven fabric.

[0019] By adopting the above technical solution, the molecular structure of polyarylethersulfone is designed to effectively reduce its melting temperature, thereby greatly reducing the processing difficulty. In addition to controlling the temperature of melt blending, the preparation method of the present application does not have any technical difficulties and does not require special improvements to the equipment, and is suitable for large-scale production.

[0020] In summary, this application includes at least one of the following beneficial technical effects: 1. The present application adds polyarylethersulfone to melt-blend polypropylene resin and polyarylethersulfone, and utilizes the high strength and high toughness of polyarylethersulfone to improve the strength and toughness of the non-woven fabric. However, the melting point of polyarylethersulfone itself is high, and due to the principle of similar compatibility, its compatibility with polypropylene resin is poor. If ordinary polyarylethersulfone is blended with polypropylene resin, it cannot melt the polyarylethersulfone at the temperature at which the polypropylene resin melts, so that it cannot achieve the technical effect of the present application, and its improvement in the strength and toughness of the non-woven fabric is small. The polyarylethersulfone prepared by the present application has hydroxyl silicone oil added to its molecular structure. The silicone oil segment can relax the rigidity of the polyarylethersulfone and improve its toughness. It is found that the silicone oil segment can reduce the conjugated properties between the aromatic groups in the polyarylethersulfone molecule, thereby significantly reducing its melting temperature and improving its processing performance. In addition, the silicone oil segment improves the compatibility between polypropylene resin and polyarylethersulfone. Under the preparation method designed by the present application, the non-woven fabric obtained has been greatly improved in strength and toughness.

[0021] 2. The transverse breaking strength of the non-woven fabric prepared in this application is between 70.8-86.2N, the longitudinal breaking strength is between 75.1-91.3N, and its impact toughness can reach 73.5J / cm 2 and above, up to 84.0J / cm 2 ; It shows that the non-woven fabric prepared in this application can take into account both strength and toughness properties, greatly improving the application potential of the non-woven fabric. DETAILED DESCRIPTION

[0022] The following is a further detailed description of this application in conjunction with the specific content.

[0023] raw material The raw materials used in the preparation examples and embodiments of the present application were all purchased from commercial sources. Among them, the hydroxy silicone oil is a bihydroxy silicone oil, which is customized by Jiashan Jiangnan Textile Materials Co., Ltd.; the softener is an amino-terminated phenyl silicone oil, model HCY-118, produced by Guangzhou Haochangyue Chemical Technology Co., Ltd.; the processing grade of the polypropylene resin is injection molding grade.

[0024] Preparation Example Preparation Example 1 A polyarylethersulfone, the preparation method of which is as follows: In a 500 g mixed solution of N,N-dimethylformamide and cyclopentane in a volume ratio of 1:1, 0.4 mol of 4,4'-difluorodiphenyl sulfone, bisphenol A, hydroxy silicone oil and 0.5 mol of anhydrous potassium carbonate were added, and then 100 g of xylene was added as a dehydrating agent and stirred until dissolved; then, under a nitrogen atmosphere, a water separator was installed, the temperature was raised to 170°C, and the reaction was refluxed for 2.5 hours to carry out a sufficient salt-forming reaction; then, the reaction system was heated to 200°C and stirred for 7 hours; the total molar amount of bisphenol A and hydroxy silicone oil was 0.4 mol, and the molar ratio of bisphenol A to hydroxy silicone oil was 2:1; the average molecular weight of the hydroxy silicone oil was 1000, and its molar amount was calculated according to its average molecular weight; 50 g of n-butanol was added to the reaction solution, and then the solvent was removed by distillation under reduced pressure to obtain polyarylethersulfone; GPC analysis showed that the average molecular weight (number average molecular weight) was 90,000 and the molecular weight distribution was 1.68.

[0025] Preparation Example 2 A polyaryl ether sulfone, which differs from Preparation Example 1 in that the average molecular weight of its hydroxy silicone oil is 3000, and the remaining steps are the same as Preparation Example 1; GPC detection shows that the average molecular weight (number average molecular weight) of the polyaryl ether sulfone is 91000, and the molecular weight distribution is 1.74.

[0026] Preparation Example 3 A polyaryl ether sulfone, which differs from Preparation Example 1 in that the average molecular weight of its hydroxy silicone oil is 5000, and the remaining steps are the same as Preparation Example 1; GPC detection shows that the average molecular weight (number average molecular weight) of the polyaryl ether sulfone is 92000, and the molecular weight distribution is 1.75. Example

[0027] Example 1 A high-tenacity non-woven fabric, the raw materials and the amounts of the raw materials are shown in Table 1, and the preparation method is as follows: S1. Preparation of fiber filaments: extruding and melting polypropylene resin, polypropylene resin, polyarylethersulfone, softener, and phenolic antioxidant at 190° C., stirring for 1.5 hours, and then spinning at a flow rate of 0.5 g / min, and cooling to room temperature to obtain fiber filaments; S2, preparation of fiber web: opening and combing the fiber filaments prepared in S1, and then laying them into a fiber web; S3, preparation of nonwoven fabric: the fiber mesh prepared in S2 was 2 Needle punching was performed at a density of 300 needles / cm 2 Needle punching is performed at a density of 800 needles / cm 2 Needle punching is performed at a density of 1000 to obtain a high-strength non-woven fabric.

[0028] Table 1 Raw materials and amounts of raw materials used in Example 1 (kg) Polypropylene resin 100 Polyarylethersulfone 30 softener 1.5 Phenolic antioxidant 264 0.7 Example 2 A high-tenacity non-woven fabric is different from Example 1 in that the polyarylethersulfone is prepared from Preparation Example 2, and the remaining steps are the same as those of Example 1.

[0029] Example 3 A high-tenacity non-woven fabric is different from Example 1 in that the polyarylethersulfone is prepared from Preparation Example 3, and the remaining steps are the same as those of Example 1.

[0030] Example 4 A high-tenacity non-woven fabric is different from Example 2 in that the amount of polyarylethersulfone added is 20 kg, and the remaining steps are the same as Example 2.

[0031] Example 5 A high-tenacity non-woven fabric, which is different from Example 2 in that the added amount of polyarylethersulfone is 40kg, and the remaining steps are the same as Example 2.

[0032] Example 6 A high-toughness non-woven fabric is different from Example 2 in that, during the preparation of the polyarylethersulfone, the molar ratio of bisphenol A to hydroxy silicone oil is 1:1, the average molecular weight of the hydroxy silicone oil is 3000, and the remaining steps are the same as Example 2.

[0033] Example 7 A high-toughness non-woven fabric, which differs from Example 2 in that, during the preparation of its polyarylethersulfone, the molar ratio of bisphenol A to hydroxy silicone oil is 3:1, the average molecular weight of the hydroxy silicone oil is 3000, and the remaining steps are the same as Example 2.

[0034] Comparative Example Comparative Example 1 A high-toughness non-woven fabric is different from Example 2 in that the added polyarylethersulfone is replaced by an equal amount of polypropylene resin, and the remaining steps are the same as Example 2.

[0035] Comparative Example 2 A high-toughness non-woven fabric is different from Example 2 in that the added polyarylethersulfone is prepared by replacing the hydroxy silicone oil with an equal molar amount of bisphenol A, and the remaining steps are the same as Example 2.

[0036] Performance testing Detection method / test method Non-woven fabrics were prepared according to the preparation methods of Examples 1-7 and Comparative Examples 1-2, and then the following tests were performed. The breaking strength was measured according to the non-woven fabric breaking strength determination standard FZ / T6005-91 using a YG065 electronic fabric strength tester with a sample size of 50 mm × 200 mm. The test results are shown in Table 2.

[0037] Table 2 Test results of Examples 1-7 and Comparative Examples 1-2 It can be seen from the test data of Examples 1-7 and Comparative Examples 1-2, as well as Table 2, that the transverse breaking strength of the nonwoven fabric prepared in this application is between 70.8-86.2N, the longitudinal breaking strength is between 75.1-91.3N, and the impact toughness can reach 73.5J / cm 2 and above, up to 84.0J / cm 2 ; It shows that the non-woven fabric prepared in this application can take into account both strength and toughness properties, which greatly improves the application potential of the non-woven fabric.

[0038] The present application adds polyarylethersulfone to melt-blend polypropylene resin and polyarylethersulfone, and utilizes the high strength and high toughness of polyarylethersulfone to improve the strength and toughness of non-woven fabrics. However, the melting point of polyarylethersulfone itself is high, and due to the principle of similar compatibility, its compatibility with polypropylene resin is poor. If ordinary polyarylethersulfone is blended with polypropylene resin, it cannot melt the polyarylethersulfone at the temperature at which the polypropylene resin melts, so that it cannot achieve the technical effect of the present application, and its improvement in the strength and toughness of the non-woven fabric is small. The polyarylethersulfone prepared by the present application has hydroxyl silicone oil added to its molecular structure. The silicone oil segment can relax the rigidity of the polyarylethersulfone and improve its toughness. It is found that the silicone oil segment can reduce the conjugated properties between the aromatic groups in the polyarylethersulfone molecule, thereby significantly reducing its melting temperature and improving its processing performance. In addition, the silicone oil segment makes the compatibility between polypropylene resin and polyarylethersulfone better. Under the preparation method designed by the present application, the non-woven fabric obtained has been significantly improved in strength and toughness. This can be verified by the test data of Examples 1-3 and Comparative Examples 1-2.

[0039] The test data from Examples 1-3 demonstrate that the molecular weight of the hydroxy silicone oil significantly impacts the performance of the nonwoven fabric. This is presumably due to its influence on the compatibility between the polypropylene resin and the polyarylethersulfone. Furthermore, in conjunction with Examples 4-5, when the polyarylethersulfone addition exceeds 30 kg, the performance improvements of the nonwoven fabric are minimal. This is believed to be due to compatibility issues between the polyarylethersulfone and the polypropylene resin.

[0040] It can be seen from the test data of Example 2 and Examples 6-7 that when the molar ratio of bisphenol A to hydroxy silicone oil is 2:1, polyarylethersulfone has a better comprehensive improvement on the strength and toughness of the non-woven fabric.

[0041] This specific embodiment is merely an explanation of the present invention and is not intended to limit the present invention. After reading this specification, those skilled in the art may make non-creative modifications to this embodiment as needed. However, as long as such modifications are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. A high-tenacity non-woven fabric, characterized by: The method comprises the following raw materials in parts by weight: 90-110 parts of polypropylene resin, 20-40 parts of polyarylethersulfone, 1-3 parts of softener and 0.3-1.2 parts of antioxidant; The polyarylethersulfone is prepared by reacting 4,4'-difluorodiphenylsulfone, small molecule bisphenol and double-terminated hydroxyl silicone oil.

2. The high-tenacity nonwoven fabric according to claim 1, characterized in that: The preparation method of the polyarylethersulfone is as follows: A mixed solution of N,N-dimethylformamide and sulfolane is used as a reaction solvent, 4,4'-difluorodiphenyl sulfone, small molecule bisphenol, dihydroxy-terminated silicone oil and anhydrous potassium carbonate are added, xylene is used as a dehydrating agent, a water separator is installed under a nitrogen atmosphere, the temperature is raised to 150-175°C, and a reflux reaction is carried out; the reaction system is then heated to 180-205°C and stirred for reaction; the total molar amount of bisphenol A and dihydroxy-terminated silicone oil is the same as that of the 4,4'-difluorodiphenyl sulfone; and the solvent is removed to obtain polyarylethersulfone.

3. The high-tenacity nonwoven fabric according to claim 2, characterized in that: The molar ratio of the small molecule bisphenol to the dihydroxy-terminated silicone oil is (1-3):

1.

4. The high-tenacity nonwoven fabric according to claim 2, characterized in that: The small molecule bisphenol is one or more of bisphenol A, bisphenol Z, and biphenol.

5. The high-tenacity nonwoven fabric according to claim 2, characterized in that: The molecular weight of the bihydroxyl silicone oil is 1000-5000.

6. The high-tenacity nonwoven fabric according to claim 1, characterized in that: The added amount of the polyarylethersulfone is 30 parts by weight.

7. The high-tenacity nonwoven fabric according to claim 1, characterized in that: The softener is amino-terminated phenyl silicone oil.

8. A method for preparing the high-tenacity nonwoven fabric according to any one of claims 1 to 7, characterized in that: It includes the following steps: S1. Preparation of fiber filaments: extruding and melting polypropylene resin, polypropylene resin, polyarylethersulfone, softener and phenolic antioxidant at 185-195° C., spinning at a flow rate of 0.4-0.7 g / min, and cooling to room temperature to obtain fiber filaments; S2, preparation of fiber web: opening and combing the fiber filaments prepared in S1, and then laying them into a fiber web; S3, preparation of non-woven fabric: the fiber mesh prepared in S2 is 80-120 needles / cm 2 Needle punching is performed at a density of 250-350 needles / cm 2 Needle punching is performed at a density of 750-850 needles / cm 2 Needle punching is performed at a density of 1000 to obtain a high-strength non-woven fabric.

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