A puncture-resistant spunbond nonwoven fabric

Abstract

This application relates to fiber products, specifically disclosing a spunbond nonwoven fabric with penetration resistance, obtained by bonding fiber webs. The fiber webs include at least a first fiber web and a second fiber web. The first fiber web comprises the following parts by weight of raw materials: 100 parts polypropylene, 10-27 parts polyacrylonitrile, and 0.5-1 parts catalyst. The second fiber web comprises the following parts by weight of raw materials: 100 parts polypropylene and 2.2-4.9 parts phenyl dichlorosilane. During the hot rolling of the spunbond nonwoven fabric of this application, the polyacrylonitrile at the molten fiber reacts in a limited manner with the phenyl dichlorosilane in the second fiber web under the catalyst, thereby strengthening the exchange and bonding of substances and molecular chains between the two fibers at the molten area, and thus strengthening the bonding strength between fibers, thereby improving the penetration resistance of the spunbond nonwoven fabric.

Description

Technical Field

[0001] This invention relates to the field of fiber products, and more specifically, to a puncture-resistant spunbond nonwoven fabric. Background Technology

[0002] Nonwoven fabric is made by arranging short textile fibers or filaments in a directional or random manner to form a web structure, and then reinforcing it by mechanical, thermal bonding or chemical methods.

[0003] Due to the manufacturing process and structural characteristics of nonwoven fabrics, when a nonwoven fabric is stretched, the tensile force is parallel to the surface of the nonwoven fabric. The tensile strength of the fibers themselves and the bonding strength between the fibers together resist the tensile force, resulting in good tensile strength resistance of the nonwoven fabric. However, when the nonwoven fabric is subjected to penetrating force, since the force acts perpendicularly to the nonwoven fabric, the resistance is mainly provided by the bonding strength between the fibers and the tensile strength of the fibers at the stress point, with the bonding strength between the fibers being the primary factor. Therefore, the nonwoven fabric is relatively weak in terms of penetration resistance.

[0004] Therefore, when nonwoven fabrics are used in material wrapping and packaging bags, they often fail not due to tensile breakage, but rather due to penetration, which creates a hole, leading to tearing and damage. Thus, the applicant aims to develop a penetration-resistant nonwoven fabric to improve its performance in material wrapping and packaging bags. Summary of the Invention

[0005] To address the problem of poor puncture resistance in nonwoven fabrics, which leads to tearing after perforation, this application provides a puncture-resistant spunbond nonwoven fabric.

[0006] This application provides a puncture-resistant spunbond nonwoven fabric, employing the following technical solution:

[0007] A spunbond nonwoven fabric with penetration resistance is obtained by bonding fiber webs, wherein the fiber webs include at least a first fiber web and a second fiber web;

[0008] The first fiber web comprises the following parts by weight of raw materials:

[0009] 100 parts of polypropylene

[0010] 10-27 parts of polyacrylonitrile,

[0011] Catalyst 0.5 to 1 part;

[0012] The second fiber web comprises the following parts by weight of raw materials:

[0013] 100 parts of polypropylene

[0014] 2.2 to 4.9 parts of phenyl dichlorosilane.

[0015] By adopting the above technical solution, spunbond nonwoven fabric is produced by hot pressing and hot rolling processes. The fiber webs melt and bond together under hot rolling, thereby achieving direct bonding between the fiber webs to form spunbond nonwoven fabric.

[0016] In this application, the amounts of polyacrylonitrile, catalyst, and phenyl dichlorosilane added are small, and the catalyst and phenyl dichlorosilane at this amount have no negative impact on the tensile strength of spunbond nonwoven fabric.

[0017] In this application, the fibers of the first fiber web contain polyacrylonitrile and a catalyst, while the fibers of the second fiber web contain phenyl dichlorosilane. During hot rolling, at the molten junction of the fibers of the first and second fiber webs, the polyacrylonitrile reacts in a limited manner with the phenyl dichlorosilane in the second fiber web under the presence of the catalyst. This enhances the exchange and bonding of substances and molecular chains between the two fibers at the molten junction, thereby strengthening the bond strength between the fibers and improving the puncture resistance of the spunbond nonwoven fabric.

[0018] Furthermore, phenyl dichlorosilane was chosen based on the physical properties of polypropylene, the main organic polymer material of spunbond nonwoven fabric in this application, the reaction conversion rate between phenyl dichlorosilane and polyacrylonitrile, and the process characteristics of spunbond nonwoven fabric. This application has analyzed other silanes, which have problems such as excessively low boiling point, low conversion rate, or easy self-polymerization without catalyst, and cannot achieve the simultaneous strength improvement and compliance with the production requirements of spunbond nonwoven fabric in this application.

[0019] Preferably, it further includes a third fiber web, wherein the first fiber web and the third fiber web are located on opposite sides of the second fiber web.

[0020] By adopting the above technical solution, the spunbond nonwoven fabric of this application is obtained by bonding three layers of fiber webs. Its basic anti-penetration performance is better than that of spunbond nonwoven fabric obtained by bonding two layers of fiber webs. At the same time, the first and third fiber webs are both obtained by reacting polyacrylonitrile with phenyl dichlorosilane under a catalyst, which realizes the strengthening connection between them and the second fiber web, and the anti-penetration performance is further improved.

[0021] In addition, polyacrylonitrile has good weather resistance and sun resistance. The first and third fiber webs containing polyacrylonitrile are located on the outer layer of the second fiber web, ultimately forming the two sides of the spunbond nonwoven fabric, which has better weather resistance and sun resistance.

[0022] Preferably, the catalyst is cuprous oxide.

[0023] By adopting the above technical solution, the catalyst is more stable and less prone to decomposition. Although its effect is slightly weaker than that of cuprous chloride as a catalyst, it is better in terms of safety and waterproof leaching. When it comes to spunbond nonwoven fabric materials that are frequently in contact with people, cuprous oxide is the better choice.

[0024] Preferably, the fiber raw material of the first fiber web further includes 0.8 to 1.6 parts of silane coupling agent, wherein the silane coupling agent does not contain Si-H bonds; the fiber raw material of the second fiber web further includes 10 to 14 parts of inorganic filler.

[0025] By adopting the above technical solution, two aspects of optimization have been achieved in this application:

[0026] First, the silane coupling agent in the first fiber web helps the catalyst to be evenly distributed during the melting process of the fiber raw materials in the first fiber web. During hot rolling, more polyacrylonitrile and phenyl dichlorosilane react at the fiber melting point, further improving the penetration resistance of the spunbond nonwoven fabric.

[0027] Secondly, in this application, the inorganic filler of the second fiber web and the silane coupling agent in the first fiber web, the catalyst with silane surface modification in the first fiber web and the organic polymer chain in the second fiber web, the two groups come into contact and react at the melt point, which strengthens the bonding strength at the melt point and improves the penetration resistance of the spunbond nonwoven fabric.

[0028] This further enhances the puncture resistance of the spunbond nonwoven fabric of this application.

[0029] Preferably, the silane coupling agent is γ-methacryloyloxypropyltrimethoxysilane. (3-aminopropyltriethoxysilane has poor amino aging properties; 3-(2,3-epoxypropoxy)propylmethyldiethoxysilane)

[0030] By adopting the above technical solution, the penetration resistance is significantly improved.

[0031] Preferably, the inorganic filler is calcium carbonate.

[0032] By adopting the above technical solution, the tensile strength of spunbond nonwoven fabric is taken into account, while the puncture resistance is also significantly improved.

[0033] Preferably, the fiber raw material of the second fiber web also includes 1.1 to 1.9 parts of toughening agent.

[0034] By adopting the above technical solutions, the toughness of spunbond nonwoven fabric is improved, thereby improving the puncture resistance of spunbond nonwoven fabric. The effect is more significant when spunbond nonwoven fabric is prepared with three or more fiber webs.

[0035] When the fiber raw material of the second fiber web contains inorganic fillers, the toughening agent compensates for the reduction in fiber toughness after the addition of inorganic fillers, ensuring the original good tensile properties of the spunbond nonwoven fabric.

[0036] Preferably, the toughening agent is EPDM.

[0037] By adopting the above technical solutions, EPDM has both flame retardant and toughening effects, which improves the performance of spunbond nonwoven fabrics in many ways.

[0038] In summary, the present invention has the following beneficial effects:

[0039] 1. During the hot rolling production of the spunbond nonwoven fabric of this application, at the melting point of the fibers of the first fiber web and the fibers of the second fiber web, polyacrylonitrile reacts in a limited manner with phenyl dichlorosilane in the second fiber web under the presence of a catalyst, thereby strengthening the exchange and bonding between the substances and molecular chains between the two fibers at the melting point, thereby strengthening the bonding strength between the fibers and improving the penetration resistance of the spunbond nonwoven fabric.

[0040] 2. The fiber raw materials of the first fiber web also include silane coupling agents, which are beneficial to the uniform distribution of the catalyst during the melting process of the fiber raw materials of the first fiber web. During hot rolling, more polyacrylonitrile and phenyl dichlorosilane react at the fiber melting point, further improving the penetration resistance of spunbond nonwoven fabric.

[0041] 3. The fiber raw materials of the first fiber web also include silane coupling agents, and the fiber raw materials of the second fiber web also include inorganic fillers. In this application, the inorganic fillers of the second fiber web and the silane coupling agents in the first fiber web, the catalyst with silane surface modification in the first fiber web, and the organic polymer chains in the second fiber web come into contact and react at the melt point, which strengthens the bonding strength at the melt point and improves the penetration resistance of the spunbond nonwoven fabric. Detailed Implementation

[0042] Raw material source:

[0043] The polypropylene is Saudi Basel PH838;

[0044] Polyacrylonitrile is a commercially available product from LF, with a molecular weight of 90,000 to 150,000.

[0045] Cuprous chloride is a commercially available product of Wujiang Runtian Fine Chemical Co., Ltd.

[0046] Cuprous oxide is a commercially available product of Jiangsu Taihe Metal Industry Co., Ltd.

[0047] γ-methacryloxypropyltrimethoxysilane, 3-aminopropyltriethoxysilane, and 3-(2,3-epoxypropoxy)propylmethyldiethoxysilane are commercially available products of Anhui Sibao Organosilicon New Materials Co., Ltd.

[0048] Phenylated dichlorosilane is a commercially available product of Anhui Aiyota Silicone Oil Co., Ltd.

[0049] Nano calcium carbonate, nano silica, and nano alumina are commercially available products of Shanghai Huijingya Nanomaterials Co., Ltd.

[0050] The EPDM is Lanxess EPDM 2660 from Germany;

[0051] Styrene-butadiene rubber is Baling Petrochemical YH-796;

[0052] The EVA is DuPont 7350.

[0053] Example 1

[0054] A spunbond nonwoven fabric that is resistant to penetration is obtained by hot pressing and hot rolling of three layers of fiber web.

[0055] The fiber web consists of a first fiber web, a second fiber web, and a third fiber web, which are stacked from the first side to the other side.

[0056] The fiber raw materials for the first fiber web are as follows by weight:

[0057] 100 parts polypropylene, 25 parts polyacrylonitrile, and 0.7 parts catalyst; the catalyst is cuprous oxide.

[0058] The surface density of the first fiber web is 35 g / m². 2 .

[0059] The fiber raw materials for the second fiber web are as follows by weight:

[0060] 100 parts polypropylene, 3.6 parts phenyl dichlorosilane.

[0061] The surface density of the second fiber web is 45 g / m². 2 .

[0062] The fibers in the third fiber web are the same as those in the first fiber web, with an areal density of 35 g / m². 2 .

[0063] The preparation process of spunbond nonwoven fabric is as follows:

[0064] S1: Prepare raw material masterbatch for each fiber by mixing the raw materials according to the fiber ratio of each fiber web, melt extruding, and granulating;

[0065] S2: The raw material masterbatch of each fiber is melt-spun to prepare its own fiber filament;

[0066] S3: A fiber web with individual constituent fibers and corresponding areal density obtained by airflow pulling each fiber filament;

[0067] S4: After the fiber webs are stacked, they are hot-pressed and hot-rolled together.

[0068] In hot pressing, the hot pressing temperature is 104℃, and in hot rolling bonding, the hot rolling pressure is 5MPa and the hot rolling temperature is 147℃, resulting in spunbond nonwoven fabric.

[0069] Example 2

[0070] A puncture-resistant spunbond nonwoven fabric, similar to Example 1, differs in that:

[0071] The fiber raw materials for the first fiber web are as follows by weight:

[0072] 100 parts polypropylene, 10 parts polyacrylonitrile, and 1 part catalyst.

[0073] The fiber raw materials for the second fiber web are as follows by weight:

[0074] 100 parts polypropylene, 2.2 parts phenyl dichlorosilane.

[0075] Example 3

[0076] A puncture-resistant spunbond nonwoven fabric, similar to Example 1, differs in that:

[0077] The fiber raw materials for the first fiber web are as follows by weight:

[0078] 100 parts polypropylene, 27 parts polyacrylonitrile, 0.5 parts catalyst;

[0079] The fiber raw materials for the second fiber web are as follows by weight:

[0080] 100 parts polypropylene, 4.9 parts phenyl dichlorosilane.

[0081] Comparative Example 1

[0082] A spunbond nonwoven fabric is obtained by hot pressing and hot rolling of three layers of fiber web.

[0083] The fiber web consists of a first fiber web, a second fiber web, and a third fiber web, which are stacked from the first side to the other side.

[0084] The fibers that make up the first, second, and third fiber webs are all polypropylene. The areal density of the first and third fiber webs is 35 g / m². 2 The surface density of the second fiber web is 45 g / m². 2 .

[0085] The preparation process of the spunbond nonwoven fabric in Comparative Example 1 is as follows:

[0086] S1: Prepare raw material masterbatch for each fiber by mixing the raw materials according to the fiber ratio of each fiber web, melt extruding, and granulating;

[0087] S2: The raw material masterbatch of each fiber is melt-spun to prepare its own fiber filament;

[0088] S3: A fiber web with individual constituent fibers and corresponding areal density obtained by airflow pulling each fiber filament;

[0089] S4: After the fiber webs are stacked, they are hot-pressed and hot-rolled together. The hot-pressing temperature during hot-pressing is 104℃, and the hot-rolling pressure during hot-rolling is 5MPa and the hot-rolling temperature is 147℃, to obtain spunbond nonwoven fabric.

[0090] Comparative Example 2

[0091] A spunbond nonwoven fabric, similar to Comparative Example 1, differs in that:

[0092] The fiber raw materials for the first fiber web are as follows by weight:

[0093] 100 parts polypropylene, 25 parts polyacrylonitrile.

[0094] The surface density of the first fiber web is 35 g / m². 2 .

[0095] The fiber raw materials for the second fiber web are as follows by weight:

[0096] 100 parts polypropylene, 3.6 parts phenyl dichlorosilane.

[0097] The surface density of the second fiber web is 45 g / m². 2 .

[0098] The fibers in the third fiber web are the same as those in the first fiber web, with an areal density of 35 g / m². 2 .

[0099] Comparative Example 3

[0100] A spunbond nonwoven fabric, similar to Comparative Example 1, differs in that:

[0101] The fiber raw materials for the first fiber web are as follows by weight:

[0102] 100 parts polypropylene, 0.7 parts catalyst; the catalyst is cuprous oxide.

[0103] The surface density of the first fiber web is 35 g / m². 2 .

[0104] The fiber raw materials for the second fiber web are as follows by weight:

[0105] 100 parts polypropylene, 3.6 parts phenyl dichlorosilane.

[0106] The surface density of the second fiber web is 45 g / m². 2 .

[0107] The fibers in the third fiber web are the same as those in the first fiber web, with an areal density of 35 g / m². 2 .

[0108] Comparative Example 4

[0109] A spunbond nonwoven fabric, similar to Comparative Example 1, differs in that:

[0110] The fiber raw materials for the first fiber web are as follows by weight:

[0111] 100 parts polypropylene, 25 parts polyacrylonitrile, and 0.7 parts catalyst; the catalyst is cuprous oxide.

[0112] The surface density of the first fiber web is 35 g / m². 2 .

[0113] The second fiber web is made of polypropylene and has an areal density of 45 g / m². 2 .

[0114] The fibers in the third fiber web are the same as those in the first fiber web, with an areal density of 35 g / m². 2 .

[0115] Example 4

[0116] A puncture-resistant spunbond nonwoven fabric, similar to Example 1, differs in that the fiber raw materials of the second fiber web are as follows by weight:

[0117] 100 parts polypropylene, 3.6 parts phenyl dichlorosilane, and 1.5 parts toughening agent; the toughening agent is EPDM.

[0118] Example 5

[0119] A spunbond nonwoven fabric with penetration resistance, similar to Example 1, except that the fiber raw materials of the first fiber web, the second fiber web, and the third fiber web are different.

[0120] The fibers that make up the first fiber web are the following raw materials in parts by weight:

[0121] 100 parts polypropylene, 25 parts polyacrylonitrile, 0.7 parts catalyst, and 1.2 parts silane coupling agent; the catalyst is cuprous oxide, and the silane coupling agent is γ-methacryloyloxypropyltrimethoxysilane.

[0122] The second fiber web is composed of the following raw materials in parts by weight:

[0123] The composition consists of 100 parts polypropylene, 3.6 parts phenyl dichlorosilane, 12.5 parts inorganic filler, and 1.5 parts toughening agent; the inorganic filler is nano-calcium carbonate, and the toughening agent is EPDM.

[0124] The surface density of the second fiber web is 45 g / m². 2 .

[0125] The fibers that make up the third fiber web are the same as those that make up the first fiber web.

[0126] Example 6

[0127] A spunbond nonwoven fabric with penetration resistance, similar to Example 2, except that the fiber raw materials of the first fiber web, the second fiber web, and the third fiber web are different.

[0128] The first fiber web is composed of the following raw materials in parts by weight:

[0129] 100 parts polypropylene, 10 parts polyacrylonitrile, 1 part catalyst, and 0.8 parts silane coupling agent; the catalyst is cuprous oxide, and the silane coupling agent is γ-methacryloyloxypropyltrimethoxysilane.

[0130] The second fiber web is composed of the following raw materials in parts by weight:

[0131] The composition consists of 100 parts polypropylene, 2.2 parts phenyl dichlorosilane, 10 parts inorganic filler, and 1.1 parts toughening agent; the inorganic filler is nano-calcium carbonate, and the toughening agent is EPDM.

[0132] The surface density of the second fiber web is 45 g / m². 2 .

[0133] The fibers that make up the third fiber web are the same as those that make up the first fiber web.

[0134] Example 7

[0135] A spunbond nonwoven fabric with penetration resistance, similar to Example 3, except that the fiber raw materials of the first fiber web, the second fiber web, and the third fiber web are different.

[0136] The first fiber web is composed of the following raw materials in parts by weight:

[0137] 100 parts polypropylene, 27 parts polyacrylonitrile, 0.5 parts catalyst, and 1.6 parts silane coupling agent; the catalyst is cuprous oxide, and the silane coupling agent is γ-methacryloyloxypropyltrimethoxysilane.

[0138] The second fiber web is composed of the following raw materials in parts by weight:

[0139] The composition consists of 100 parts polypropylene, 4.9 parts phenyl dichlorosilane, 14 parts inorganic filler, and 1.9 parts toughening agent; the inorganic filler is nano-calcium carbonate, and the toughening agent is EPDM.

[0140] The surface density of the second fiber web is 45 g / m². 2 .

[0141] Examples 8-12

[0142] A spunbond nonwoven fabric with penetration resistance is similar to that in Example 5, except that the amount of fiber raw materials used in the first fiber web, the second fiber web, and the third fiber web are different. The specific differences are shown in Table 1 below.

[0143] Table 1. Fiber raw material usage in Examples 1-12 and Comparative Examples 1-4

[0144]

[0145]

[0146] Example 13

[0147] A puncture-resistant spunbond nonwoven fabric, similar to Example 10, except that the toughening agent in the fiber raw material of the second fiber web is EVA.

[0148] Example 14

[0149] A spunbond nonwoven fabric with penetration resistance, similar to Example 10, except that the toughening agent in the fiber raw material of the second fiber web is styrene-butadiene rubber.

[0150] Example 15

[0151] A spunbond nonwoven fabric with penetration resistance, similar to Example 1, except that the catalyst in the fiber raw material of the first fiber web is cuprous chloride.

[0152] Example 16

[0153] A spunbond nonwoven fabric with penetration resistance, similar to Example 5, except that the catalyst in the fiber raw material of the first fiber web is cuprous chloride.

[0154] Example 17

[0155] A spunbond nonwoven fabric with penetration resistance, similar to Example 5, except that the silane coupling agent in the fiber raw material of the first fiber web is 3-aminopropyltriethoxysilane.

[0156] Example 18

[0157] A spunbond nonwoven fabric with penetration resistance, similar to Example 5, except that the silane coupling agent in the fiber raw material of the first fiber web is 3-(2,3-epoxypropoxy)propylmethyldiethoxysilane.

[0158] Example 19

[0159] A spunbond nonwoven fabric with penetration resistance, similar to Example 5, except that the filler in the fiber raw material of the second fiber web is nano-silica.

[0160] Example 20

[0161] A spunbond nonwoven fabric with penetration resistance, similar to Example 5, except that the filler in the fiber raw material of the second fiber web is nano-alumina.

[0162] Example 21

[0163] A spunbond nonwoven fabric with penetration resistance, similar to that of Example 10, except that the spunbond nonwoven fabric of Example 21 is obtained by simply laminating, hot pressing and hot rolling a first fiber web and a second fiber web.

[0164] Example 22

[0165] A spunbond nonwoven fabric with penetration resistance, similar to that of Example 11, except that the spunbond nonwoven fabric of Example 22 is obtained by simply laminating, hot pressing and hot rolling a first fiber web and a second fiber web.

[0166] Example 23

[0167] A spunbond nonwoven fabric with penetration resistance, similar to that of Example 12, except that the spunbond nonwoven fabric of Example 23 is obtained by simply laminating, hot pressing and hot rolling a first fiber web and a second fiber web.

[0168] The spunbond nonwoven fabrics obtained in Examples 1-23 and Comparative Examples 1-4 were tested for tensile properties and breaking strength according to the strip method in GB / T 24218.3-2010.

[0169] The spunbond nonwoven fabrics obtained in Examples 1-23 and Comparative Examples 1-4 were tested for mechanical penetration resistance and bursting strength according to GB / T 24218.5-2010.

[0170] The test results are shown in Table 2 below.

[0171] Table 2. Tensile properties and penetration test results of Examples 1-23 and Comparative Examples 1-4

[0172] Fracture strength (N / 5cm) <![CDATA[Bursting strength / (N / cm 2 )]]> Example 1 8.8 462 Example 2 8.6 454 Example 3 8.9 465 Comparative Example 1 8.2 386 Comparative Example 2 8.6 401 Comparative Example 3 8.2 386 Comparative Example 4 8.6 405 Example 4 9 475 Example 5 9.1 485 Example 6 9 475 Example 7 9.3 494 Example 8 9 437 Example 9 9 470 Example 10 9.2 502 Example 11 9.1 492 Example 12 9.5 507 Example 13 9.1 496 Example 14 9 483 Example 15 8.9 479 Example 16 9.1 497 Example 17 9 481 Example 18 9.2 478 Example 19 9.2 477 Example 20 9.1 482 Example 21 6.5 381 Example 22 6.3 362 Example 23 6.6 394

[0173] Based on Tables 1 and 2, comparing Examples 1-3 with Comparative Example 1, the bursting strength of the spunbond nonwoven fabrics of Examples 1-3 is significantly better than that of Comparative Example 1.

[0174] Comparing Example 1 with Comparative Examples 2-4, it can be seen that the improvement in the bursting strength of the spunbond nonwoven fabric in Examples 1-3 is achieved by the synergistic effect of polyacrylonitrile in the fiber raw material of the first fiber web, the catalyst, and phenyl dichlorosilane in the fiber raw material of the second fiber web. During the hot rolling process of the spunbond nonwoven fabric production process of this application, at the melting point of the fibers of the first fiber web and the second fiber web, polyacrylonitrile reacts with phenyl dichlorosilane in the second fiber web in a limited manner under the catalyst, thereby strengthening the exchange and bonding between the substances and molecular chains between the two fibers at the melting point, and thus strengthening the bonding strength between the fibers, thereby improving the penetration resistance of the spunbond nonwoven fabric.

[0175] Comparing Example 1 and Example 8, it can be seen that in Example 8, inorganic filler was only added to the second fiber web. Since inorganic filler was added alone when the fibers in the second fiber web were combined with the fibers in the first fiber web, the addition of inorganic filler would make the joint more prone to breakage if inorganic filler was present at the joint. Therefore, although the breaking strength was improved, the bursting strength was reduced.

[0176] Comparing Examples 1 and 9, it can be seen that in Example 9, coupling agents were only added to the fibers of the first and third fiber webs. The bursting strength of the spunbond nonwoven fabric in Example 9 was improved because the silane coupling agent in the first fiber web facilitated the uniform distribution of the catalyst during the melting process of the fiber raw materials in the first fiber web. During hot rolling, more polyacrylonitrile and phenyl dichlorosilane reacted at the fiber melting points, thus improving the puncture resistance of the spunbond nonwoven fabric.

[0177] Furthermore, based on Examples 1 and 5-7, it can be seen that, on the basis of Examples 1-3, coupling agents were added to the fibers of the first and third fiber webs in Examples 5-7, and inorganic fillers were added to the fibers of the second fiber web. The bursting strength of Examples 5-7 is greater than that of Examples 1-3, and the bursting strength improvement of Example 5 is better than that of Example 9.

[0178] The coupling agent that enhances the bursting strength in the first / second fiber web and the inorganic filler that degrades the bursting strength in the second fiber web, when added simultaneously, can have a synergistic effect, resulting in an improvement in spunbond nonwoven fabric that exceeds that achieved by only adding the coupling agent. This is because the inorganic filler in the second fiber web and the silane coupling agent in the first fiber web, the silane surface-modified catalyst in the first fiber web, and the organic polymer chains in the second fiber web, all come into contact and react at the molten site, strengthening the bonding strength at the molten site and improving the puncture resistance of the spunbond nonwoven fabric.

[0179] Comparing Examples 1, 4, and 10-14, it can be seen that adding a toughening agent to the fibers of the second fiber web in this application can improve the bursting strength of the spunbond nonwoven fabric of this application, and the toughening agent can be EVA, EPDM, or styrene-butadiene rubber, with EPDM being the preferred toughening agent.

[0180] Comparing Examples 1, 15, and 16, it can be seen that cuprous oxide and cuprous chloride can be used as catalysts in this application. Cuprous chloride has a better catalytic effect, resulting in spunbond nonwoven fabric with better penetration resistance. The spunbond nonwoven fabric obtained using cuprous oxide has slightly lower penetration resistance, but its safety and applicability are wider.

[0181] Comparing Examples 1, 17, and 18, it can be seen that the inorganic filler in this application can also be 3-aminopropyltriethoxysilane or 3-(2,3-epoxypropoxy)propylmethyldiethoxysilane.

[0182] Comparing Examples 1, 19, and 20, it can be seen that the inorganic filler in this application can also be nano-silica or nano-alumina, with nano-calcium carbonate being preferred.

[0183] As can be seen from Comparative Example 1, Example 21, Example 22, and Example 23, the spunbond nonwoven fabric of this application can also be made by laminating, hot pressing, and hot rolling two layers of fiber webs. The spunbond nonwoven fabric prepared by the two-layer fiber web of this application, after improving its penetration resistance, is comparable to the conventional spunbond nonwoven fabric prepared by three-layer fiber webs.

[0184] This specific embodiment is merely an explanation of the present invention and is not intended to limit the invention. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A penetration resistant, spunbonded nonwoven fabric, characterized in that, The fiber web is obtained by lamination, and the fiber web comprises a first fiber web, a second fiber web and a third fiber web; The first fiber web and the third fiber web are respectively located on two sides of the second fiber web; The first fiber web comprises the following raw materials in mass fraction: Polypropylene 100 parts, Polyacrylonitrile 10-27 parts, Catalyst 0.5-1 part; The second fiber web comprises the following raw materials in mass fraction: Polypropylene 100 parts, Phenyl dichlorosilane 2.2-4.9 parts; The catalyst is cuprous oxide or cuprous chloride; After the lamination of the fiber webs, heat pressing lamination and hot rolling adhesion are performed to produce a spun-bond nonwoven fabric; during the hot rolling, the fibers of the first fiber web and the fibers of the second fiber web melt, and the polyacrylonitrile reacts with the phenyl dichlorosilane in the second fiber web under the catalysis of the catalyst.

2. The puncture resistant, spunbond nonwoven fabric of claim 1, wherein: The catalyst is cuprous oxide.

3. The penetration resistant, spunbond nonwoven fabric of claim 1, wherein: The fiber raw material of the first fiber web further comprises a silane coupling agent 0.8-1.6 parts, and the silane coupling agent does not contain Si-H bond; the fiber raw material of the second fiber web further comprises an inorganic filler 10-14 parts.

4. The puncture resistant, spunbond nonwoven of claim 3, wherein: The silane coupling agent is γ-methacryloyloxypropyl trimethoxysilane.

5. The puncture resistant, spunbond nonwoven of claim 4, wherein: The inorganic filler is calcium carbonate.

6. The penetration resistant, spunbond nonwoven fabric of claim 1 or 4, wherein: The fiber raw material of the second fiber web further comprises a toughening agent 1.1-1.9 parts.

7. The puncture resistant, spunbond nonwoven of claim 6, wherein: The toughening agent is EPDM.

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