Non-woven composite material, preparation method and application thereof, and production device of non-woven composite material

Abstract

The invention provides a non-woven composite material, a preparation method and application of the non-woven composite material and a production device of the non-woven composite material, and relates to the technical field of layered composite materials. In the non-woven composite material provided by the invention, the middle water absorption layer is the crossed fiber net formed by the core layer preparation raw materials including the chemical fibers and the short fibers, the area of the crossed fiber net accounts for more than 50% of the area of the middle water absorption layer, and the fibers of the middle water absorption layer are not arranged in a single orientation manner, so that the strength of the non-woven composite material is improved. Moreover, the first chemical fiber net layer and the second chemical fiber net layer which are prepared by taking the thermoplastic polymer and the functional master batch as raw materials wrap and protect the middle water absorption layer, so that falling of short fibers of the middle water absorption layer is remarkably reduced, and falling of fluff pulp fibers is also remarkably reduced due to a crossed fiber net of the middle water absorption layer.

Description

Technical Field

[0001] The invention relates to the technical field of layered composite materials, and in particular to a non-woven composite material and a preparation method and application thereof, and a production device for the non-woven composite material. Background Art

[0002] Nonwoven fabrics can be seen everywhere in daily life and industrial production, especially the demand for disposable sanitary products has greatly increased. At present, nonwoven fabrics are mainly prepared by multi-fiber mixed spray-dry web forming process. The multi-fiber mixed spray-dry web forming process is to mix meltblown fibers and fluff pulp fibers. Among them, meltblown fibers have a smaller fiber diameter, a larger specific surface area and a stronger cleaning ability; fluff pulp fibers have good skin affinity and water absorption and water retention. The multi-fiber mixed spray-dry web forming technology can realize the preparation of composite materials with strong water absorption. Obviously, the strength of existing nonwoven fabrics is low. Summary of the invention

[0003] In view of this, an object of the present invention is to provide a non-woven composite material and a preparation method, device and application thereof. The non-woven composite material provided by the present invention has high strength.

[0004] In order to achieve the above object, the present invention provides the following technical solutions:

[0005] The present invention provides a nonwoven composite material, comprising a first chemical fiber web layer, a middle water-absorbing layer and a second chemical fiber web layer stacked in sequence;

[0006] The first chemical fiber web layer is a layered network structure formed by raw materials for preparing the first surface layer; the raw materials for preparing the first surface layer include a first thermoplastic polymer and a first functional masterbatch;

[0007] The second chemical fiber web layer is a layered network structure formed by the raw materials for preparing the second surface layer; the raw materials for preparing the second surface layer include a second thermoplastic polymer and a second functional masterbatch;

[0008] The middle water-absorbing layer is a cross-fiber web structure formed by the raw materials for preparing the core layer, and the raw materials for preparing the core layer include chemical filaments and short fibers; the area of ​​the cross-fiber web accounts for more than 50% of the area of ​​the middle water-absorbing layer.

[0009] Preferably, the average fiber diameter of the first chemical fiber web layer and the second chemical fiber web layer is independently 0.5-10 μm, and the gram weight is independently 0.1-10 gsm;

[0010] The mass fraction of the first thermoplastic polymer in the raw material for preparing the first surface layer is 89.5-95%;

[0011] The mass fraction of the second thermoplastic polymer in the raw material for preparing the second surface layer is 89.5-95%;

[0012] The mass of the first chemical fiber web layer and the second chemical fiber web layer independently accounts for 3 to 20% of the mass of the nonwoven composite material;

[0013] The raw materials for preparing the first surface layer and the raw materials for preparing the second surface layer further include functional additives, and the functional additives include one or more of a water absorbent, a softener and an antibacterial agent; the mass of the functional additives accounts for 0.2 to 8% of the mass of the non-woven composite material;

[0014] The first surface layer preparation raw material and the second surface layer preparation raw material further include an antioxidant.

[0015] Preferably, the chemical filaments include one or more of polypropylene-based fibers, polyethylene-based fibers, polyethylene terephthalate-based fibers, styrene-butadiene-styrene triblock copolymer-based fibers, and ethylene-vinyl acetate copolymer-based fibers;

[0016] The short fibers include one or more of cellulose short fibers, synthetic short fibers and super absorbent short fibers;

[0017] The core layer preparation raw materials also include functional fillers, which include super absorbent fibers, low melting point fibers and super absorbent resins; the melting point of the low melting point fibers is ≤150°C;

[0018] In the nonwoven composite material, the mass fraction of chemical filaments is 6.5-23.2%, and the mass fraction of short fibers is 20-69.6%;

[0019] The number of layers of the intermediate water-absorbing layer is several.

[0020] Preferably, the first thermoplastic polymer and the second thermoplastic polymer independently include one or more of polypropylene, modified polypropylene, polyethylene, modified polyethylene, polyethylene terephthalate, styrene-butadiene-styrene triblock copolymer and ethylene-vinyl acetate copolymer;

[0021] The first functional masterbatch and the second functional masterbatch independently include one or more of a hydrophilic masterbatch, a biodegradable masterbatch, a soft masterbatch and an antibacterial masterbatch.

[0022] The present invention also provides a method for preparing the nonwoven composite material described in the above technical solution, comprising the following steps:

[0023] The raw materials for preparing the first surface layer are heated until they are melted and then first spun to obtain a first chemical fiber web layer; during the first spinning process, first cooling is performed;

[0024] Cross-mixing the raw materials for preparing the core layer, laying a web on the surface of the first chemical fiber mesh layer to form an intermediate water-absorbing layer having a cross fiber mesh, and obtaining a chemical fiber mesh layer-intermediate water-absorbing layer;

[0025] The raw material for preparing the second surface layer is heated until it is melted, and a second chemical fiber mesh layer is formed by second spinning on the surface of the intermediate water-absorbing layer of the chemical fiber mesh layer-intermediate water-absorbing layer to obtain a chemical fiber mesh layer-intermediate water-absorbing layer-chemical fiber mesh layer; and a second cooling is performed during the second spinning process;

[0026] The chemical fiber mesh layer-middle water-absorbing layer-chemical fiber mesh layer are hot-rolled and composited to obtain the non-woven composite material.

[0027] Preferably, the first cooling and the second cooling independently include atomizing spray cooling or cooling with cold air using a cooling liquid; the cooling liquid includes pure water or a functional additive solution; the spraying volume of the cooling liquid is 0 to 200 L / h;

[0028] When the core layer preparation raw materials also include functional fillers, cross-mixing the chemical filaments, short fibers and functional fillers;

[0029] The temperature of the hot rolling composite is 90-160°C.

[0030] The present invention provides the use of the nonwoven composite material described in the above technical solution or the nonwoven composite material prepared by the preparation method described in the above technical solution in disposable sanitary products or wipes.

[0031] The present invention also provides a production device for the nonwoven composite material described in the above technical solution or the method for preparing the nonwoven composite material described in the above technical solution, comprising a first surface layer preparation unit 1, a core layer preparation unit 2, a second surface layer preparation unit 3, a mesh curtain 4 and a hot rolling mill 6;

[0032] The first surface layer preparation unit 1 is provided with a first spinning assembly 11 and a first spraying system 12; the first spinning assembly 11 comprises a coaxial melt-blown spinning assembly or an air knife draft spinning assembly; the first spinning assembly 11 comprises at least one melt cavity, each melt cavity being connected to a spinneret hole;

[0033] The core layer preparation unit 2 is provided with a forming box 21, and the forming box 21 is provided with a raw material inlet 23 and a raw material inlet pipe 25;

[0034] The second surface layer preparation unit 3 includes a third spinning assembly 31 and a second spray system 32; the third spinning assembly 31 includes a coaxial melt-blown spinning assembly or an air knife draft spinning assembly; the third spinning assembly 31 includes at least one melt cavity, each melt cavity is connected to a spinneret hole;

[0035] The mesh material outlets of the first surface layer preparation unit 1, the core layer preparation unit 2, and the second surface layer preparation unit 3 are respectively connected to the mesh curtain 4;

[0036] The mesh curtain 4 is provided with a mesh bottom suction system 41 .

[0037] Preferably, the core layer preparation unit 2 is further provided with a second spinning assembly 22, a raw material adding system 24 and a defibrillation system 26, the fiber outlet of the second spinning assembly 22 is connected to the forming box 21, and the second spinning assembly 22 includes a coaxial melt-blown spinning assembly or an air knife drafting spinning assembly; the second spinning assembly 22 includes at least one melt cavity, each melt cavity is connected to a spinneret hole; the defibrillation system 26 is arranged on the raw material inlet pipe 25; the forming box 21 is connected to the raw material adding system 24;

[0038] The number of the core layer preparation units 2 is several.

[0039] Preferably, the production device further includes a heating device 5 , a quality detection unit 7 and a winding and slitting unit 8 .

[0040] In the nonwoven composite material provided by the present invention, the middle water-absorbing layer is a cross fiber net formed by the raw materials for preparing the core layer including chemical filaments and short fibers, the area of ​​the cross fiber net accounts for more than 50% of the area of ​​the middle water-absorbing layer, and the fibers of the middle water-absorbing layer are not arranged in a single orientation, thereby improving the strength of the nonwoven composite material. Moreover, the first chemical fiber net layer and the second chemical net layer prepared by using thermoplastic polymer and functional masterbatch as raw materials form a coating and protection for the middle water-absorbing layer, significantly reducing the shedding of short fibers in the middle water-absorbing layer, and at the same time, the cross fiber net of the middle water-absorbing layer also significantly reduces the shedding of fluff pulp fibers.

[0041] Furthermore, the present invention introduces super absorbent fibers into the middle absorbent layer, and the super absorbent fibers are evenly distributed in the middle absorbent layer, which can greatly improve the water absorption performance of the nonwoven composite material. Low melting point chemical fibers are introduced into the middle absorbent layer, and after thermal excitation during the hot rolling composite process, the nonwoven composite material has stronger binding properties on the short fibers, and the anti-flocking performance is significantly improved.

[0042] Furthermore, the present invention introduces a water absorbent into the first chemical fiber mesh layer and / or the second chemical mesh layer to improve the water absorption performance of the non-woven composite material; introduces the softener to improve the softness of the non-woven composite material; introduces an antibacterial agent to improve the antibacterial and mildew-proof properties of the non-woven composite material.

[0043] As shown in the test results of the embodiments, the longitudinal strength of the non-woven composite material provided by the present invention is 12.56-48.3N, the longitudinal elongation is 30.8-58.3%, the transverse strength is 6.43-40.2N, the longitudinal elongation is 50.1-78.4%, the water absorption time is less than 16-36s, the water absorption ratio is 969-8532%, and the lint coefficient is 3.73-4.5, which indicates that the non-woven composite material provided by the present invention has high strength, good anti-lint performance and strong water absorption.

[0044] The present invention provides a method for preparing the non-woven composite material described in the above technical solution. In the process of preparing the first chemical fiber mesh layer and the second chemical fiber mesh layer, the present invention performs cooling during the spinning process, so that the fibers have more excellent strength performance, thereby significantly improving the strength of the non-woven composite material. The intermediate water-absorbing layer prepared by the present invention is a cross-fiber mesh formed by the core layer preparation raw materials including chemical filaments and short fibers. The area of ​​the cross-fiber mesh accounts for more than 50% of the area of ​​the intermediate water-absorbing layer. The fibers of the intermediate water-absorbing layer are not arranged in a single orientation, which improves the strength of the non-woven composite material. The first chemical fiber mesh layer and the second chemical mesh layer form a coating and protection for the intermediate water-absorbing layer, which significantly reduces the fluff pulp fiber (short fiber) shedding of the intermediate water-absorbing layer. At the same time, the cross-fiber mesh of the intermediate water-absorbing layer also significantly reduces the fluff pulp fiber shedding. The present invention performs hot rolling compounding on the chemical fiber mesh layer-intermediate water-absorbing layer-chemical fiber mesh layer, and performs rolling point compounding on the relatively separated fiber layers to improve the bonding strength between the fibers of each layer. Moreover, the preparation method provided by the present invention has simple process, simple operation, low production cost, and is suitable for industrial production.

[0045] Each spinning assembly in the production device adopted by the present invention is equipped with an independent raw material supply device, which is independent of each other and does not interfere with each other. It has a special configuration of multiple raw material input ports and a special structure of the spinning assembly. A variety of raw materials can be used in the production process, and the special spatial structure makes the prepared non-woven composite material have better fluffiness, strength, water absorption and good anti-flocking performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 The present invention is a schematic structural diagram of a production device for preparing a nonwoven composite material, wherein 1 is a first surface layer preparation unit, 11 is a first spinning assembly, 12 is a first spraying system, 2 is a core layer preparation unit, 21 is a forming box, 22 is a second spinning assembly, 23 is a raw material inlet, 24 is a raw material adding system, 25 is a raw material inlet pipe, 26 is a fiber removal system, 3 is a second surface layer preparation unit, 31 is a third spinning assembly, 32 is a second spraying system, 4 is a web curtain, 5 is a heating device, 6 is a hot rolling mill, 7 is a quality inspection unit, and 8 is a winding and slitting unit;

[0047] Figure 2 It is a schematic diagram of the structure of spinning assembly No. 1;

[0048] Figure 3 It is a schematic diagram of the structure of spinning assembly No. 2;

[0049] Figure 4 It is a schematic diagram of the structure of spinning assembly No. 3;

[0050] Figure 5 It is a schematic diagram of the structure of No. 4 spinning assembly;

[0051] Figure 6 It is a schematic diagram of the structure of spinning assembly No. 5;

[0052] Figure 7 It is a schematic diagram of the structure of spinning assembly No. 6;

[0053] Figure 8 is a schematic diagram of the thermal device structure;

[0054] Fig. 9 The schematic diagram of the structure of the nonwoven composite material (two layers of middle water-absorbing layers) prepared by the present invention;

[0055] Fig.10 This is a schematic diagram of the structure of the nonwoven composite material (1 middle water-absorbing layer) prepared in the present invention. DETAILED DESCRIPTION

[0056] The present invention provides a nonwoven composite material, comprising a first chemical fiber web layer, a middle water-absorbing layer and a second chemical fiber web layer stacked in sequence;

[0057] The first chemical fiber web layer is a layered network structure formed by raw materials for preparing the first surface layer; the raw materials for preparing the first surface layer include a first thermoplastic polymer and a first functional masterbatch;

[0058] The second chemical fiber web layer is a layered network structure formed by the raw materials for preparing the second surface layer; the raw materials for preparing the second surface layer include a second thermoplastic polymer and a second functional masterbatch;

[0059] The middle water-absorbing layer is a cross-fiber web structure formed by core layer raw materials, the core layer raw materials include chemical filaments and short fibers; the area of ​​the cross-fiber web accounts for more than 50% of the area of ​​the middle water-absorbing layer; the short fibers include cellulose short fibers.

[0060] In the present invention, the structural schematic diagram of the nonwoven composite material is shown in Fig. 9 , the following combination Fig. 9 The nonwoven composite material is described in detail.

[0061] The nonwoven composite material provided by the present invention comprises a first chemical fiber mesh layer. In the present invention, the first chemical fiber mesh layer is a layered mesh structure formed by raw materials for preparing the first surface layer. In the present invention, the function of the first chemical fiber mesh layer is to coat and protect the middle water-absorbing layer.

[0062] In the present invention, the raw material for preparing the first surface layer includes a first thermoplastic polymer and a first functional masterbatch. In the present invention, the first thermoplastic polymer preferably includes one or more of polypropylene (PP), modified polypropylene, polyethylene (PE), polyethylene terephthalate (PET), styrene-butadiene-styrene triblock copolymer (SBS) and ethylene-vinyl acetate copolymer (EVA). The present invention has no special limitation on the modified polypropylene, and the modified polypropylene well known to those skilled in the art can be used. In the present invention, the melt index of the first thermoplastic polymer is preferably 30 to 1800 g / 10 min, and in specific embodiments may be 30 g / 10 min, 50 g / 10 min, 100 g / 10 min, 200 g / 10 min, 300 g / 10 min, 400 g / 10 min, 500 g / 10 min, 600 g / 10 min, 700 g / 10 min, 800 g / 10 min, 900 g / 10 min, 1000 g / 10 min, 1100 g / 10 min, 1200 g / 10 min, 1300 g / 10 min, 1400 g / 10 min, 1500 g / 10 min, 1600 g / 10 min, 1700 g / 10 min or 1800 g / 10 min.

[0063] In the present invention, the mass fraction of the first thermoplastic polymer in the raw material for preparing the first surface layer is preferably 89.5-95%, and in specific embodiments it can be 89.5%, 90%, 90.5%, 91%, 91.5%, 92%, 92.5%, 93%, 93.5%, 94%, 94.5% or 95%.

[0064] In the present invention, the first functional masterbatch preferably includes one or more of hydrophilic masterbatch, biodegradable masterbatch, soft masterbatch and antibacterial masterbatch. In the present invention, the hydrophilic masterbatch preferably includes one or more of polyether hydrophilic masterbatch, polyamide hydrophilic masterbatch and fatty acid lipid hydrophilic masterbatch. In the present invention, the biodegradable masterbatch preferably includes aerobic biodegradable masterbatch and / or anaerobic biodegradable masterbatch. In the present invention, the soft masterbatch preferably includes amide softener masterbatch. In the present invention, the antibacterial masterbatch preferably includes one or more of nano cuprous oxide, nano zinc oxide and silver ion antibacterial agent.

[0065] In the present invention, the raw materials for preparing the first surface layer preferably also include functional additives, and the functional additives preferably include one or more of a water absorbent, a softener and an antibacterial agent. In the present invention, the mass of the functional additive (commercially available product) preferably accounts for 0.2-8% of the mass of the non-woven composite material, and in specific embodiments it can be 0.2%, 0.5%, 1%, 2%, 3%, 4%, 5%, 6%, 7% or 8%. In the present invention, the addition of the water absorbent can improve the water absorption performance of the non-woven composite material; the addition of the softener can improve the softness of the non-woven composite material; the addition of the antibacterial agent can improve the antibacterial and mildew-proof properties of the non-woven composite material.

[0066] In the present invention, the antibacterial agent preferably includes an organic antibacterial agent, and more preferably includes one or more of a quaternary ammonium salt compound, polyhexamethylene biguanide hydrochloride and polyhexamethylene guanidine hydrochloride; the antibacterial agent is used in the form of an antibacterial agent solution, and the antibacterial agent solution is preferably obtained by diluting a commercially available antibacterial agent stock solution; the concentration of the antibacterial agent solution is preferably 50 to 300 g / L, and in specific embodiments it can be 50 g / L, 100 g / L, 150 g / L, 200 g / L, 250 g / L or 300 g / L; the diluent used for the dilution preferably includes water.

[0067] In the present invention, the softener preferably includes a hydrophilic softener, and more preferably includes fatty alcohol polyoxyethylene ether and / or polyether modified dimethyl silicone oil. In the present invention, the water absorbent preferably includes one or more of a polyether water absorbent, a polyamide water absorbent, a fatty acid lipid water absorbent, and a quaternary ammonium salt water absorbent; the polyether water absorbent preferably includes Chuanhua Chemical hydrophilic softener TF-4511, Chuanhua Chemical hydrophilic high-touch silicone oil TF-405, etc.; the polyamide water absorbent preferably includes Chuanhua Chemical hydrophilic soft oil TF-440A, etc.; the fatty acid lipid water absorbent preferably includes Lupert TM W312, Lurui Fine Chemicals non-silicone softener Raysoft CS-N, etc.; the quaternary ammonium salt water absorbent preferably includes Transchem Chemicals high-concentration soft hydrophilic softener TF-4514 and Lurui Fine Chemicals non-silicone softener Raysoft CS-N.

[0068] In the present invention, the raw material for preparing the first surface layer preferably also includes an antioxidant, and the antioxidant preferably includes one or more of 2,6-di-tert-butyl-4-methylphenol (BHT), hindered phenol antioxidants and phosphite antioxidants; the mass of the antioxidant preferably accounts for 0.1-2% of the mass of the raw material for preparing the first surface layer, and in specific embodiments it can be 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9% or 2%.

[0069] In the present invention, the raw material for preparing the first surface layer preferably includes one or more of mixture 1, mixture 2, mixture 3 and mixture 4, and in a specific embodiment, it can be one, two or three of mixture 1, mixture 2, mixture 3 and mixture 4; when the raw material for preparing the first surface layer is two or more of mixture 1, mixture 2, mixture 3 and mixture 4, the first chemical fiber web layer is a mixed fiber web layer formed by fibers of different components, so that the surface strength of the non-woven composite material is further improved; the mass ratio of any two mixtures in the raw material for preparing the first surface layer is preferably 1:0.5-2, and in a specific embodiment, it can be 1:0.5, 1:0.6, 1:0.7, 1:0.8, 1:0.9, 1:10, 1:11, 1:12, 1:13, 1:14, 1:15, 1:16, 1:17, 1:18, 1:19, 1:20, 1:21, 1:22, 1:23, 1:24, 1:25, 1:26, 1:27, 1:28, 1:29, 1:30, 1:31, 1:32, 1:33, 1:34, 1:35 0.9, 1:1, 1:1.1, 1:1.2, 1:1.3, 1:1.4, 1:1.5, 1:1.6, 1:1.7, 1:1.8, 1:1.9 or 1:2; the mass ratio of any three mixtures in the raw materials for preparing the first surface layer is preferably 1:0.5-2:0.5-2, and in a specific embodiment it can be 1:0.5:0.5, 1:0.5:1, 1:0.5:1.5, 1:0.5:2, 1:1:0.5, 1:1:1, 1:1:1.5, 1:1:2, 1:1.5:0.5, 1:1.5:1, 1:1.5:1.5, 1:1.5:2, 1:2:0.5, 1:2:1, 1:2:1.5 or 1:2:2.

[0070] In the present invention, the mixture 1 preferably includes polypropylene particles, hydrophilic masterbatch and biodegradable masterbatch, and the mass ratio of the polypropylene particles, hydrophilic masterbatch and biodegradable masterbatch in the mixture 1 is preferably 94-96:3-5:1, more preferably 94:5:1, 95:4:1 or 96:3:1.

[0071] In the present invention, the mixture 2 preferably includes polypropylene particles and hydrophilic masterbatch, and the mass ratio of the polypropylene particles to the hydrophilic masterbatch in the mixture 2 is preferably 95-97:3-5, and in a specific embodiment can be 95:5, 96:4 or 97:3.

[0072] In the present invention, the mixture 3 preferably includes modified polyethylene particles, hydrophilic masterbatch and styrene-butadiene-styrene triblock copolymer. The mass ratio of the modified polyethylene particles, hydrophilic masterbatch and styrene-butadiene-styrene triblock copolymer in the mixture 3 is preferably 30-89:1-10:10-60, and more preferably 75:5:20.

[0073] In the present invention, the mixture 4 preferably includes EVA resin and antioxidant, and the mass ratio of EVA resin to antioxidant in the mixture 4 is preferably 99.9-98.5:0.1-1.5, more preferably 99:1.

[0074] In the present invention, the average fiber diameter of the first chemical fiber mesh layer is preferably 0.5-10μm, and in specific embodiments, it can be 0.5μm, 1μm, 1.9μm, 2μm, 2.3μm, 2.4μm, 2.6μm, 3μm, 4μm, 5μm, 6μm, 7μm, 8μm, 9μm or 10μm; the gram weight of the first chemical fiber mesh layer is preferably 0.1-10gsm, and in specific embodiments, it can be 0.1gsm, 0.5gsm, 1gsm, 2gsm, 3gsm, 4gsm, 5gsm, 6gsm, 7gsm, 8gsm, 9gsm or 10gsm.

[0075] The nonwoven composite material provided by the present invention comprises a middle water-absorbing layer, and the middle water-absorbing layer is a cross-fiber web structure formed by raw materials for preparing a core layer.

[0076] In the present invention, the number of layers of the intermediate water-absorbing layer is preferably several layers, more preferably 1 to 8 layers, and in specific embodiments it can be 1 layer, 2 layers, 3 layers, 4 layers, 5 layers, 6 layers, 7 layers or 8 layers; the core layer of each intermediate water-absorbing layer is preferably prepared from the same or different raw materials.

[0077] In the present invention, the raw materials for preparing the core layer include chemical filaments and staple fibers; the chemical filaments preferably include one or more of polypropylene-based fibers, polyethylene-based fibers, polyethylene terephthalate-based fibers, styrene-butadiene-styrene triblock copolymer-based fibers, and ethylene-vinyl acetate copolymer-based fibers; the raw materials for preparing the chemical filaments are preferably the same as the optional types of raw materials for preparing the aforementioned first surface layer, which will not be repeated here. In the present invention, the diameter of the chemical filaments is preferably 0.1 to 5 μm, and in specific embodiments it can be 0.1 μm, 0.5 μm, 1 μm, 2 μm, 3 μm, 4 μm, or 5 μm; the present invention does not specifically limit the length of the chemical filaments, and continuous chemical filaments well known to those skilled in the art can be used.

[0078] In the present invention, the staple fibers preferably include one or more of cellulose staple fibers, synthetic staple fibers and super absorbent staple fibers; the staple fibers play a role in absorbing water and conducting water in the material; the length of the staple fibers is preferably 1 to 8 mm, and in specific embodiments may be 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm or 8 mm; the diameter of the staple fibers is preferably 2 to 5 mm, and in specific embodiments may be 2 mm, 3 mm, 4 mm or 5 mm.

[0079] In the present invention, the core layer preparation raw material preferably also includes functional fillers, and the functional fillers preferably include one or more of super absorbent fiber (SAF), low melting point fiber and super absorbent resin (SAP, granular); the super absorbent fiber and super absorbent resin mainly play a role in absorbing water, which can greatly improve the water absorption performance of the non-woven composite material. In the present invention, the melting point of the low melting point fiber is preferably ≤150°C, more preferably 110-150°C, and in specific embodiments it can be 110°C, 115°C, 120°C, 125°C, 130°C, 135°C, 140°C, 145°C or 150°C; the low melting point fiber preferably includes low melting point PE fiber, and the melting point of the low melting point PE fiber is preferably 110°C; the low melting point fiber can play a role in bonding and binding cellulose staple fibers.

[0080] In the present invention, the mass fraction of chemical filaments in the non-woven composite material is preferably 6.5-23.2%, and in specific embodiments it can be 6.5%, 7%, 8%, 9%, 10%, 10.85%, 11%, 12%, 13%, 13.3%, 14%, 15%, 16%, 17.7%, 18%, 19%, 20%, 21%, 22%, 23% or 23.2%; the mass fraction of staple fibers in the non-woven composite material is preferably 20-69.6%, and in specific embodiments it can be 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65% or 69.6%.

[0081] In the present invention, the area of ​​the cross-fiber web accounts for more than 50% of the area of ​​the middle water-absorbing layer, preferably 50-100%, and in specific embodiments can be >50%, >55%, >60%, >65%, >70%, >75%, >80%, >85%, >90%, >95% or 100%. In the present invention, the crossing angles of the fibers in the cross-fiber web are random.

[0082] In the present invention, the mass of the first chemical fiber web layer preferably accounts for 3-20% of the mass of the non-woven composite material. In specific embodiments, it can be 3%, 3.5%, 3.6%, 4%, 4.5%, 5%, 5.45%, 5.5%, 6%, 6.5%, 6.65%, 7%, 7.5%, 8%, 8.35%, 8.5%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19% or 20%.

[0083] In the present invention, the second chemical fiber web layer is a layered network structure formed by the second surface layer preparation raw material; the second surface layer preparation raw material includes a second thermoplastic polymer and a second functional masterbatch. In the present invention, the optional types of the second surface layer preparation raw material of the second chemical fiber web layer, the fiber diameter and the gram weight of the second chemical fiber web layer are preferably the same as those of the first chemical fiber web layer, and they are not described one by one here.

[0084] The present invention also provides a method for preparing the nonwoven composite material described in the above technical solution, comprising the following steps:

[0085] The raw materials for preparing the first surface layer are heated until they are melted and then first spun to obtain a first chemical fiber web layer; during the first spinning process, first cooling is performed;

[0086] Cross-mixing the raw materials for preparing the core layer, laying a web on the surface of the first chemical fiber mesh layer to form an intermediate water-absorbing layer having a cross fiber mesh, and obtaining a chemical fiber mesh layer-intermediate water-absorbing layer;

[0087] The raw material for preparing the second surface layer is heated until it is melted, and a second chemical fiber mesh layer is formed by second spinning on the surface of the intermediate water-absorbing layer of the chemical fiber mesh layer-intermediate water-absorbing layer to obtain a chemical fiber mesh layer-intermediate water-absorbing layer-chemical fiber mesh layer; and a second cooling is performed during the second spinning process;

[0088] The chemical fiber mesh layer-middle water-absorbing layer-chemical fiber mesh layer are hot-rolled and composited to obtain the non-woven composite material.

[0089] In the present invention, the raw materials for preparing the first surface layer are heated to be melted and then subjected to first spinning to obtain a first chemical fiber mesh layer; and a first cooling process is performed during the first spinning process.

[0090] In the present invention, the heating to melt is preferably carried out by heating and melting through single-screw extrusion, twin-screw extrusion or multi-screw extrusion equipment, and chemical fibers of the same or different components can be sprayed out simultaneously. When chemical fibers of different components are sprayed out simultaneously, a first chemical fiber web is formed in a mixed fiber manner, thereby further improving the surface strength of the non-woven composite material.

[0091] In the present invention, the first cooling preferably includes atomizing spray cooling or cold wind cooling using a cooling liquid; the cooling liquid preferably includes pure water or a functional additive solution. In the present invention, the functional additive and concentration in the functional additive solution are the same as those of the aforementioned functional additive, and are not repeated here. In the present invention, the spraying amount of the cooling liquid is preferably 0 to 200 L / h, and in a specific embodiment it can be 10 L / h, 20 L / h, 30 L / h, 40 L / h, 50 L / h, 60 L / h, 70 L / h, 80 L / h, 90 L / h, 100 L / h, 110 L / h, 120 L / h, 130 L / h, 140 L / h, 150 L / h, 160 L / h, 170 L / h, 180 L / h, 190 L / h or 200 L / h. In the present invention, the angle between the cooling liquid sprayed by the atomized spray cooling and the direction of the fiber spray movement is preferably 90 to 180°, and in specific embodiments it can be 90°, 100°, 110°, 120°, 130°, 140°, 150°, 160°, 170° or 180°. In the present invention, the cold air temperature of the cold air cooling is preferably 5 to 30°C. The present invention performs the first cooling in the first spinning process, so that the fiber has better strength performance, thereby significantly improving the strength of the non-woven composite material. In the present invention, the temperature of the fiber after the first cooling is preferably ≤150°C, more preferably ≤100°C.

[0092] After the first spinning is completed, the present invention preferably further comprises subjecting the obtained fiber to a first stretching; during the first stretching process, the drafting air volume of each spinneret hole is preferably 0.1 to 1 m 3 / h, in a specific embodiment, it can be 0.1m 3 / h、0.2m 3 / h、0.3m 3 / h、0.4m 3 / h、0.5m 3 / h、0.6m 3 / h、0.7m 3 / h、0.8m 3 / h、0.9m 3 / h or 1m 3 / h; the first stretching preferably includes surrounding air outlet stretching, middle air outlet pipe stretching or two side slit stretching.

[0093] After obtaining the first chemical fiber mesh layer, the present invention cross-mixes the raw materials for preparing the core layer, lays a mesh on the surface of the first chemical fiber mesh layer to form an intermediate water-absorbing layer with a cross fiber mesh, and obtains a chemical fiber mesh layer-intermediate water-absorbing layer.

[0094] In the present invention, the chemical filament is preferably obtained by a third spinning process of a third thermoplastic polymer and a third functional masterbatch. In the present invention, the third spinning process is not cooled. In the present invention, the optional types of the third thermoplastic polymer, the optional types of the third functional masterbatch, the third thermoplastic polymer, the mass fraction of the third thermoplastic polymer and the third functional masterbatch in the chemical filament are preferably the same as the corresponding preparation conditions of the chemical fiber web layer, which will not be repeated here. In the present invention, the third spinning preferably includes melt blowing.

[0095] After the third spinning is completed, the present invention preferably further comprises performing a second drafting on the obtained fiber to obtain chemical filaments. In the present invention, the second drafting method is preferably the same as the first drafting method, which will not be described in detail herein.

[0096] In the present invention, when the raw materials for preparing the core layer further include functional fillers, the present invention preferably cross-mixes the chemical filaments, the short fibers and the functional fillers.

[0097] In the present invention, the web laying is preferably carried out on a web-forming curtain, and the air suction at the bottom of the net can be adjusted by separately setting wind shields with different mesh sizes to achieve the adjustment of the suction size at the corresponding position, that is, the degree of mixing and cross-mixing of raw materials in the forming box can be controlled according to the combination of wind shields with different mesh sizes, and at the same time, the forming area of ​​the outer layer of chemical fibers in the web-forming curtain can be fine-tuned.

[0098] In the present invention, the intermediate water-absorbing layer is preferably prepared once or twice. When the intermediate water-absorbing layer is prepared twice, the second intermediate water-absorbing layer is preferably prepared on the surface of the intermediate water-absorbing layer prepared for the first time.

[0099] After obtaining the chemical fiber mesh layer-intermediate water-absorbing layer, the raw material for preparing the second surface layer is heated to be melted, and a second spinning is performed on the surface of the intermediate water-absorbing layer of the chemical fiber mesh layer-intermediate water-absorbing layer to form a second chemical fiber mesh layer, thereby obtaining a chemical fiber mesh layer-intermediate water-absorbing layer-chemical fiber mesh layer; a second cooling is performed during the second spinning process. In the present invention, the preparation method of the second chemical fiber mesh layer is preferably the same as the preparation method of the first chemical fiber mesh layer, and will not be repeated here.

[0100] After obtaining the chemical fiber mesh layer-middle water-absorbing layer-chemical fiber mesh layer, the present invention performs hot rolling compounding on the chemical fiber mesh layer-middle water-absorbing layer-chemical fiber mesh layer to obtain the non-woven composite material.

[0101] In the present invention, the hot rolling composite is preferably not subjected to heat treatment or subjected to heat treatment. When the core layer preparation raw material contains low-melting-point chemical fibers, heat treatment is preferably performed. In the present invention, the temperature of the heat treatment is preferably 90-180°C, and in specific embodiments, it can be 90°C, 100°C, 110°C, 120°C, 130°C, 140°C, 150°C, 160°C, 170°C or 180°C; the baking treatment is preferably performed in an oven. In the present invention, the purpose of the heat treatment is to remove moisture in the material and to stimulate the low-melting-point chemical fibers. Under the action of heat (such as hot air), the low-melting-point chemical fibers partially melt, so that they play a bonding role on the cellulose staple fibers; at the same time, due to the action of heat and moisture in the material, the hydrogen bonds between the cellulose fibers in the material are opened to form a non-woven composite material with a more fluffy structure. The present invention can give the non-woven composite material a permanent pattern through the pattern on the hot rolling roller, and the pattern shape has diversity.

[0102] In the present invention, the temperature of the hot rolling compound is preferably 90-160°C, and in specific embodiments, it can be 90°C, 100°C, 110°C, 115°C, 120°C, 125°C, 130°C, 140°C, 150°C or 160°C; the pressure of the hot rolling compound is preferably 25-85bar, and in specific embodiments, it can be 20bar, 30bar, 40bar, 50bar, 60bar, 65bar, 70bar, 75bar, 80bar or 85bar; the hot rolling compound is preferably a round roller rotating hot rolling compound, and preferably a round roller embossing machine is used for hot rolling compounding. The present invention has no special limitation on the pattern on the round roller used for the hot rolling compound, and it can be determined according to actual needs.

[0103] After the hot-rolled composite is completed, the present invention preferably further comprises the step of inspecting the obtained hot-rolled composite material for metal, gram weight, and appearance defects by an automatic quality inspection unit, and then slitting and rolling the hot-rolled composite material to obtain a non-woven composite material product.

[0104] The present invention provides the use of the nonwoven composite material described in the above technical solution or the nonwoven composite material prepared by the preparation method described in the above technical solution in disposable sanitary products or wipes.

[0105] The present invention also provides a production device for the nonwoven composite material described in the above technical solution or the method for preparing the nonwoven composite material described in the above technical solution, comprising a first surface layer preparation unit 1, a core layer preparation unit 2, a second surface layer preparation unit 3, a mesh curtain 4 and a hot rolling mill 6;

[0106] The first surface layer preparation unit 1 is provided with a first spinning assembly 11 and a first spraying system 12; the first spinning assembly 11 comprises a coaxial melt-blown spinning assembly or an air knife draft spinning assembly; the first spinning assembly 11 comprises at least one melt cavity, each melt cavity being connected to a spinneret hole;

[0107] The core layer preparation unit 2 is provided with a forming box 21, and the forming box 21 is provided with a raw material inlet 23 and a raw material inlet pipe 25;

[0108] The second surface layer preparation unit 3 includes a third spinning assembly 31 and a second spray system 32; the third spinning assembly 31 includes a coaxial melt-blown spinning assembly or an air knife draft spinning assembly; the third spinning assembly 31 includes at least one melt cavity, each melt cavity is connected to a spinneret hole;

[0109] The mesh material outlets of the first surface layer preparation unit 1 , the core layer preparation unit 2 and the second surface layer preparation unit 3 are respectively connected to a mesh forming curtain 4 ; the mesh forming curtain 4 is provided with a mesh bottom suction system 41 .

[0110] In the present invention, the structural schematic diagram of the production device is as follows Figure 1 As shown below, combined Figure 1 The production device is described in detail.

[0111] The production device provided by the present invention includes a first surface layer preparation unit 1, which is provided with a first spinning component 11 and a first spray system 12; the first spinning component 11 includes a coaxial melt-blown spinning component or a wind knife drawing spinning component; the first spinning component 11 includes at least one melt cavity, and each melt cavity is connected to a spinneret hole.

[0112] In the present invention, the coaxial melt-blown spinning assembly is preferably provided with a spinneret, a melt cavity, a melt channel, a hot air channel, a hot air cavity, an outer air plate and an inner air plate; the spinneret preferably includes a plate body and a spinneret hole; each melt cavity is connected to the spinneret hole; the number of the melt cavities is preferably 1 to 5, and in a specific embodiment can be 1, 2, 3, 4 or 5.

[0113] In the present invention, the coaxial melt-blown spinning assembly preferably comprises Figure 2 The spinning assembly No. 1 of the structure shown has a melt chamber and multiple rows of spinnerets.

[0114] In the present invention, the coaxial melt-blown spinning assembly preferably comprises Figure 3 The No. 2 spinning assembly of the structure shown has two melt chambers and multiple rows of spinnerets, and the two melt chambers are melt chamber 1 and melt chamber 2.

[0115] In the present invention, the coaxial melt-blown spinning assembly preferably comprises Figure 4The No. 3 spinning assembly of the structure shown has three melt chambers and multiple rows of spinnerets, and the three melt chambers are melt chamber 1, melt chamber 2 and melt chamber 3.

[0116] In the present invention, the coaxial melt-blown spinning assembly preferably comprises Figure 5 The No. 4 spinning assembly shown has two melt cavities and multiple rows of spinnerets. The two melt cavities are melt cavity 1 and melt cavity 2, and the two melt cavities are distributed up and down.

[0117] In the present invention, the air knife stretch spinning assembly is preferably provided with a melt cavity 1, a melt cavity 2, a spinneret, a spinneret hole, a melt channel, a hot air channel and an air knife; each melt cavity is connected to a spinneret hole; the number of the melt cavities is preferably 1 to 2, and in a specific embodiment, it can be 1 or 2. In the present invention, the air knife stretch spinning assembly preferably includes a Figure 6 Spinning assembly No. 5 of the structure shown or Figure 7 Spinning pack No. 6 of the structure shown.

[0118] In the present invention, the stretching of the first spinning component 11 preferably includes surrounding air outlet stretching, middle air outlet stretching or two-side slit stretching; the surrounding air outlet stretching is preferably: each spinneret corresponds to an surrounding air outlet, and a stretching airflow with process temperature is sprayed around the spinneret to stretch the sprayed melt, and the surrounding air outlet stretching component has no special requirements on the number of spinneret rows; the middle air outlet stretching is preferably: the melt ejection channel is located around the air outlet pipe, and when the melt is ejected, the middle air outlet pipe sprays a stretching airflow to stretch it, and the middle air outlet stretching has no special requirements on the number of spinneret rows; the two-side slit stretching is preferably: the stretching airflow is sprayed in the slits on both sides of the spinneret to stretch the melt; when the two-side slit stretching component is used, the number of spinneret rows is 1 to 2 rows. In the present invention, the first spinning assembly 11 preferably uses a single cavity with two rows of spinnerets in parallel, a single cavity with two rows of spinnerets in staggered relation, or a double cavity with one row of spinnerets. The present invention preferably realizes the simple switching of different spinning assemblies by completing the disassembly and assembly of the fixing bolts.

[0119] In the present invention, the first spray system 12 is preferably provided with a water tank, a pressurized water pump, a flow control valve, a transmission pipeline and an atomizing spray head. The first spray system 12 is preferably located at a range of 5 to 50 cm below the spinneret, and in a specific embodiment, it can be located at a range of 5 cm, 10 cm, 15 cm, 20 cm, 25 cm, 30 cm, 35 cm, 40 cm, 45 cm or 50 cm below the spinneret; the angle between the first spray system 12 and the direction of chemical fiber ejection movement is preferably 90 to 180°, and in a specific embodiment, it can be 90°, 100°, 110°, 120°, 130°, 140°, 150°, 160°, 170° or 180°.

[0120] The production device provided by the present invention comprises a core layer preparation unit 2 ; the core layer preparation unit 2 is provided with a forming box 21 , and the forming box 21 is provided with a raw material inlet 23 and a raw material inlet pipe 25 .

[0121] In the present invention, the fibrous raw material is preferably transported to the molding box 21 through the raw material inlet pipe 25 , and the granular raw material is preferably transported to the molding box 21 through the raw material adding system 24 .

[0122] In the present invention, the material of the molding box 21 preferably includes one or more of metal, hard polymer and glass; the metal preferably includes steel; the hard polymer preferably includes polycarbonate. In the present invention, during the preparation of the intermediate water-absorbing layer, chemical fibers and short fibers (or chemical fibers, short fibers and super absorbent fibers) are mixed and crossed in the molding box 21.

[0123] In the present invention, the core layer preparation unit 2 is preferably further provided with a second spinning component 22, a raw material adding system 24 and a fiber defibration system 26, the fiber outlet of the second spinning component 22 is connected to the molding box 21, and the second spinning component 22 includes a coaxial melt-blown spinning component or a wind knife drawing spinning component; the second spinning component 22 includes at least one melt cavity, and each melt cavity is connected to a spinneret hole; the fiber defibration system 26 is arranged on the raw material inlet pipe 25; the molding box 21 is connected to the raw material adding system 24; the number of the second spinning components 22 is 1 or 2, and the two spinning components can be opened at the same time, any one of them can be opened, or closed at the same time, without interfering with or affecting each other; the structural composition of the second spinning component 22 is preferably the same as that of the first spinning component 11, which will not be repeated here.

[0124] In the present invention, the raw material adding system 24 is preferably provided with a raw material transmission pipe, the inner wall of which is smooth and has no edges and corners, so that the super absorbent fibers will not remain. The super absorbent fibers are evenly distributed in the CD direction through the raw material adding system 24 and transmitted to the molding box 21 through the transmission pipe.

[0125] In the present invention, the number of the core layer preparation units 2 is preferably several, and the number of the core layer preparation units 2 is preferably the same as the number of the intermediate water-absorbing layers.

[0126] The production device provided by the present invention further comprises a second surface layer preparation unit 3, which comprises a third spinning assembly 31 and a second spray system 32. In the present invention, the structural composition of the second surface layer preparation unit 3 is preferably the same as that of the first surface layer preparation unit 1, and will not be described one by one here.

[0127] The production device provided by the present invention also includes a web-forming curtain 4, and the web-forming curtain 4 is provided with a web-bottom suction system 41; the web material outlets of the first surface layer preparation unit 1, the core layer preparation unit 2, and the second surface layer preparation unit 3 are respectively connected to the web-forming curtain 4. In the present invention, under the action of the web-bottom suction system 41, each fiber web is laid on the web-forming curtain 4; the web-bottom suction system 41 can adjust the suction size of the corresponding position by separately setting wind shields with different mesh sizes, that is, the degree of mixing, overlapping and crossing of the raw materials in the forming box 21 can be controlled according to the matching of wind shields with different mesh sizes, and at the same time, the first chemical fiber web layer and the second chemical fiber web layer can be fine-tuned in the forming area of ​​the web-forming curtain 4.

[0128] The production device provided by the present invention preferably also includes a thermal device 5, which preferably adopts a hot air penetration drying method. Two motor-driven active rollers are respectively configured above and below, which can better match the high-speed movement of the material and avoid the phenomenon of cloth breakage as much as possible; two tension adjustment rollers that can move laterally are configured in the middle to adjust the tightness of the material.

[0129] In the present invention, the thermal device 5 preferably includes a drying chamber, and a porous distribution plate is preferably provided in the drying chamber, and the porous distribution plate preferably includes a distribution plate 1 and a distribution plate 2, and the distribution plate 1 and the distribution plate 2 are both provided with cloth guide rods, and a tension adjustment rod is provided on the connecting line between the cloth guide rod on the distribution plate 1 and the cloth guide rod on the distribution plate 2; the drying chamber is preferably provided with a hot air inlet and an air outlet. In the present invention, the distribution plate 1 is used to evenly disperse the hot air blown in by the hot air blower and then enter the drying chamber, and the hot air penetrates the materials distributed in the drying chamber along the M shape, and is extracted by the exhaust fan through the distribution plate 2; the main function of the distribution plate 1 and the distribution plate 2 is to disperse the hot air flow, ensure that the airflow entering the drying chamber is uniform, and prevent damage to the local position of the fabric or uneven force on the fabric surface due to uneven distribution of the airflow.

[0130] The production device provided by the present invention includes a hot rolling mill 6. In the present invention, the hot rolling mill 6 is preferably provided with a working pattern roller and a spare pattern roller, and the spare pattern roller can be disassembled, assembled, repaired, etc. without stopping the machine, which can minimize the impact on product production. The hot rolling mill 6 used in the present invention can realize the rapid switching of the pattern roller, and can be a "Y" type automatic roller changer.

[0131] The production device provided by the present invention is preferably further provided with a quality detection unit 7 and a winding and slitting unit 8 .

[0132] Combine the following Figure 1 The preparation of the nonwoven composite material is described in detail.

[0133] The raw material for preparing the first surface layer is heated to be molten, and then the raw material is spun through the first spinning assembly 11, and then the raw material is first drawn onto the mesh curtain 4 to obtain the first chemical fiber mesh layer; during the first spinning process, the first cooling is performed by the first spraying system 12;

[0134] The raw materials for preparing the core layer are cross-mixed in a forming box 21, and are laid on the surface of the first chemical fiber mesh layer through a mesh curtain 4 to form an intermediate water-absorbing layer with a cross-fiber mesh, thereby obtaining a chemical fiber mesh layer-intermediate water-absorbing layer; the area of ​​the cross-fiber mesh is controlled to account for more than 50% of the area of ​​the intermediate water-absorbing layer through a mesh bottom suction system 41; the chemical fiber in the raw materials for preparing the core layer is preferably obtained by a third thermoplastic polymer and a third functional masterbatch through a third spinning process through a second spinning assembly 22;

[0135] The raw material for preparing the second surface layer is heated to be melted, and the second spinning is performed on the surface of the intermediate water-absorbing layer of the chemical fiber mesh layer-intermediate water-absorbing layer through the third spinning assembly 31 to form a second chemical fiber mesh layer, and the second stretching is performed to the surface of the intermediate water-absorbing layer on the mesh curtain 4 to obtain a chemical fiber mesh layer-intermediate water-absorbing layer-chemical fiber mesh layer; and the second spinning process is performed through the second spraying system 32 for second cooling;

[0136] The chemical fiber mesh layer-middle water-absorbing layer-chemical fiber mesh layer are hot-rolled and compounded in a hot rolling mill 6 to obtain the non-woven composite material.

[0137] In the present invention, taking the intermediate water-absorbing layer as two layers as an example, after forming the intermediate water-absorbing layer with a cross fiber web, the present invention preferably also includes preparing a second intermediate water-absorbing layer on the area of ​​the intermediate water-absorbing layer. Specifically, when preparing the second intermediate water-absorbing layer, the core layer preparation raw material is used to prepare the second intermediate water-absorbing layer in the second core layer preparation unit to obtain a chemical fiber mesh layer-intermediate water-absorbing layer; the area of ​​the cross fiber web is controlled to account for more than 50% of the area of ​​the intermediate water-absorbing layer through the net bottom suction system 41; the chemical fiber in the core layer preparation raw material is preferably obtained by the fourth spinning of the third thermoplastic polymer and the third functional masterbatch through the third spinning component 31.

[0138] In order to further illustrate the present invention, the scheme of the present invention is described in detail below in conjunction with the accompanying drawings and embodiments, but they should not be understood as limiting the protection scope of the present invention.

[0139] In the following examples, the hydrophilic masterbatch was purchased from Changzhou Wangyi New Material Technology Co., Ltd., and the biodegradable masterbatch was purchased from Chuanhua Chemical Group. The length of the short fiber is 1 to 8 mm. Except for the short fiber and the super absorbent resin, the other fibers in the first chemical fiber mesh layer, the middle water-absorbing layer and the second chemical fiber mesh layer are all continuous long fibers.

[0140] Example 1

[0141] The nonwoven composite material comprises, from bottom to top, a first chemical fiber mesh layer, a middle water-absorbing layer (two layers) and a second chemical fiber mesh layer.

[0142] (1) Polypropylene particles, hydrophilic masterbatch, and biodegradable masterbatch are mixed in a mass ratio of 94:5:1, and are sprayed out through a first spinning assembly 11 (spinning assembly No. 1) using a single screw extruder, and are stretched on a web curtain 4 using an enveloping air outlet drafting airflow to obtain a first chemical fiber web layer. During the spraying process, a first spraying system 12 disposed 20 cm below the spinneret hole sprays pure water mist for cooling, and the spraying amount is 150 L / h; the average fiber diameter of the first chemical fiber web layer is 2-3 μm, and the gram weight is 2 gsm;.

[0143] (2) Polypropylene particles, hydrophilic masterbatch and biodegradable masterbatch are mixed in a mass ratio of 96:3:1, and the resulting mixture is melt-blown through a second spinning assembly 22 (spinning assembly No. 1), and stretched by an outer ring stretching airflow of a spinneret to obtain chemical filaments; the chemical filaments are cross-mixed with cellulose staple fibers in a metal forming box 21, and the area of ​​the cross-fiber web is controlled to account for more than 75% of the area of ​​the middle water-absorbing layer through a net bottom suction system 41, and the cross-fiber web is formed on a net curtain 4 below the forming box 21 to form an middle water-absorbing layer.

[0144] (3) Using the second core layer preparation unit, repeat the operation of step (2) on the surface of the middle water-absorbing layer to obtain a chemical fiber mesh layer-middle water-absorbing layer.

[0145] (4) Using the second surface layer preparation unit 3, the operation of step (1) is repeated on the surface of the chemical fiber mesh layer-intermediate water-absorbing layer to obtain a chemical fiber mesh layer-intermediate water-absorbing layer-chemical fiber mesh layer.

[0146] (5) The web is transported to the hot rolling mill 6 through the web curtain 4 for hot rolling compounding (temperature 125°C, pressure 75 bar), the pattern is designed to contain animal cartoon elements, and the non-woven composite material is cut and rolled after passing through the automatic quality inspection unit for metal, weight, and appearance defects. The non-woven composite material has a weight of 55 gsm, a total content of two chemical fiber web layers of 7.2wt%, a content of chemical filaments of 23.2wt%, and a content of cellulose staple fibers of 69.6wt%.

[0147] Example 2

[0148] The nonwoven composite material comprises, from bottom to top, a first chemical fiber mesh layer, a middle water-absorbing layer (two layers) and a second chemical fiber mesh layer.

[0149] (1) Polypropylene particles with a melt index of 35 g / 10 min and hydrophilic masterbatch are mixed in a mass ratio of 95:5, and are ejected through a first spinning assembly 11 using a single screw extruder. The filaments are adsorbed on a web curtain 4 by a slit drafting method to obtain a first chemical fiber web layer. During the ejection process, cold air (5 to 30° C.) is used to cool the fibers; the average fiber diameter of the first chemical fiber web layer is 7.8 μm, and the gram weight is 10 gsm.

[0150] (2) Polypropylene particles with a melt index of 1200 g / 10 min and hydrophilic masterbatch are mixed in a mass ratio of 97:3, ejected from the melt cavity 1 of the second spinning assembly 22 (spinning assembly No. 2), and stretched by an outer ring stretching airflow of the spinneret hole to obtain chemical filament 1; at the same time, polypropylene particles with a melt index of 500 g / 10 min and hydrophilic masterbatch are mixed in a mass ratio of 97:3, ejected from the melt cavity 2 of the second spinning assembly 22 (spinning assembly No. 2), and stretched by an outer ring stretching airflow of the spinneret hole to obtain chemical filament 2; the chemical filaments 1 and 2 are cross-mixed with cellulose staple fibers and super absorbent resin (SAP) in a metal forming box 21, and the area of ​​the cross-fiber web is controlled to account for more than 75% of the area of ​​the intermediate water-absorbing layer by a net bottom suction system 41, and the chemical filaments are formed on a net curtain 4 below the forming box 21 to form an intermediate water-absorbing layer. Among them, the chemical fiber web formed near the middle layer uses low melt index polypropylene particles, and the formed fibers have higher strength, stronger adhesion, and a fluffier spatial structure, so that the fluff pulp fibers and SAF can be better bound. In addition, the part close to the surface layer uses polypropylene particles with a higher melt index, and the formed fibers are finer, the formed pores are smaller, and the fiber web is denser, which can form a better wrapping property for the fluff pulp and SAF.

[0151] (3) Using the second core layer preparation unit, repeat the operation of step (2) on the surface of the middle water-absorbing layer to obtain a chemical fiber mesh layer-middle water-absorbing layer.

[0152] (4) Using the second surface layer preparation unit 3, the operation of step (1) is repeated on the surface of the chemical fiber mesh layer-intermediate water-absorbing layer to obtain a chemical fiber mesh layer-intermediate water-absorbing layer-chemical fiber mesh layer.

[0153] (5) The nonwoven composite material is transported to the hot rolling mill 6 through the web curtain 4 for hot rolling compounding (temperature 125°C, pressure 75 bar). In order to avoid the influence of hot rolling on the SAP effect, the pattern is designed as a sesame dot pattern. After passing through the automatic quality inspection unit, the metal, weight, and appearance defects are inspected and then slitting and rolling are performed to obtain a nonwoven composite material. The nonwoven composite material has a weight of 120 gsm, a total content of two layers of chemical fiber mesh layers of 16.7 wt%, a content of SAP of 50 wt%, a content of cellulose staple fibers of 20 wt%, and a content of chemical filament 1 and chemical filament 2 of 6.65 wt%.

[0154] Example 3

[0155] The nonwoven composite material comprises, from bottom to top, a first chemical fiber mesh layer, a middle water-absorbing layer (two layers) and a second chemical fiber mesh layer.

[0156] (1) Modified PE particles, hydrophilic masterbatch, and styrene-butadiene-styrene triblock copolymer elastomer are mixed in a mass ratio of 75:5:20 to form a first mixed raw material, polypropylene particles and hydrophilic masterbatch are mixed in a mass ratio of 95:5 to form a second mixed raw material; EVA resin and antioxidant BHT are mixed in a mass ratio of 99:1 to form a third mixed raw material; the three mixed raw materials are melted by separate screw extruders in a mass ratio of 1:1:1, transported to three adjacent melt cavities in the first spinning assembly 11 (spinning assembly No. 3), sprayed out through corresponding spinnerets, and stretched on the web curtain 4 using spinneret outer ring drafting airflow, and the three fibers are crossed to form a fiber web, thereby obtaining a first chemical fiber web layer. Among them, the first mixed raw material is sprayed out through the outermost spinneret, the second mixed raw material is sprayed out through the middle spinneret, and the third mixed raw material is sprayed out through the innermost spinneret. During the spraying process, the first spraying system 12 disposed 20 cm below the spinneret hole sprays pure water for cooling, with a spraying volume of 120 L / h; the average fiber diameter of the first chemical fiber web layer is 2.3 μm, and the gram weight is 9 gsm.

[0157] (2) EVA is ejected through the second spinning assembly 22 (spinning assembly No. 1) and stretched by an outer ring stretching airflow of the spinneret to obtain chemical filaments; the chemical filaments are cross-mixed with cellulose staple fibers and super absorbent resin (SAP) in a metal molding box 21, and the area of ​​the cross-fiber web is controlled to account for more than 75% of the area of ​​the middle water-absorbing layer through the net bottom suction system 41, and the cross-fiber web is formed on the net curtain 4 below the molding box 21 to form an middle water-absorbing layer.

[0158] (3) Using the second core layer preparation unit, repeat the operation of step (2) on the surface of the middle water-absorbing layer to obtain a chemical fiber mesh layer-middle water-absorbing layer.

[0159] (4) Using the second surface layer preparation unit 3, the operation of step (1) is repeated on the surface of the chemical fiber mesh layer-intermediate water-absorbing layer to obtain a chemical fiber mesh layer-intermediate water-absorbing layer-chemical fiber mesh layer.

[0160] (5) The nonwoven composite material is transported to the heat device 5 through the web curtain 4 for heat drying (the drying temperature is set to 130°C), and then transported to the hot rolling mill 6 for hot rolling compounding (temperature 125°C, pressure 75bar). In order to avoid the influence of hot rolling on the SAP effect, the pattern is designed as a sesame dot pattern. After passing through the automatic quality inspection unit, the metal, gram weight, and appearance defects are inspected, and then the nonwoven composite material is cut and rolled to obtain the nonwoven composite material. The gram weight of the nonwoven composite material is 120gsm, the total content of the two layers of chemical fiber mesh is 15wt%, the content of SAP is 50wt%, the content of cellulose staple fibers is 20wt%, and the content of chemical filaments is 15wt%.

[0161] This embodiment is subjected to heat baking treatment by a heat device, which can stimulate the bonding effect of EVA fibers, reduce the shedding of fluff pulp and SAP of the non-woven composite material, and can increase the strength performance of the non-woven composite material to a certain extent.

[0162] Example 4

[0163] The nonwoven composite material comprises, from bottom to top, a first chemical fiber mesh layer, a middle water-absorbing layer (two layers) and a second chemical fiber mesh layer.

[0164] (1) Modified PE particles, hydrophilic masterbatch, and styrene-butadiene-styrene triblock copolymer elastomer are mixed in a mass ratio of 75:5:20 to form a first mixed raw material, and polypropylene particles and hydrophilic masterbatch are mixed in a mass ratio of 95:5 to form a second mixed raw material; the two mixed raw materials are melted by separate screw extruders in a mass ratio of 1:1, transported to two upper and lower melt cavities in the first spinning assembly 11 (spinning assembly No. 4), and ejected through corresponding spinnerets. On the web curtain 4, the two fibers cross each other to form a fiber web, thereby obtaining a first chemical fiber web layer. During the ejection process, the first spray system 12 disposed 20 cm below the spinneret is used to spray pure water for cooling, and the spraying volume is 180 L / h; the average fiber diameter of the first chemical fiber web layer is 2.6 μm, and the gram weight is 4 gsm; the drafting method is spinneret outer ring drafting airflow drafting.

[0165] (2) Polypropylene fibers are ejected through the second spinning assembly 22 (spinning assembly No. 1) and stretched by an outer ring stretching airflow through the spinneret hole to obtain chemical filaments; the chemical filaments are cross-mixed with cellulose staple fibers and SAF in a metal forming box 21, and the area of ​​the cross-fiber web is controlled to account for a proportion of more than 75% of the area of ​​the middle water-absorbing layer through the net bottom suction system 41, and are formed on the net curtain 4 below the forming box 21 to form an middle water-absorbing layer.

[0166] (3) Using the second core layer preparation unit, repeat the operation of step (2) on the surface of the middle water-absorbing layer to obtain a chemical fiber mesh layer-middle water-absorbing layer.

[0167] (4) Using the second surface layer preparation unit 3, the operation of step (1) is repeated on the surface of the chemical fiber mesh layer-intermediate water-absorbing layer to obtain a chemical fiber mesh layer-intermediate water-absorbing layer-chemical fiber mesh layer.

[0168] (5) The nonwoven composite material is transported to the hot rolling mill 6 through the web curtain 4 for hot rolling compounding (temperature 115°C, pressure 65 bar). In order to avoid the influence of hot rolling on the SAF effect, the pattern is designed as geometric pattern lines. After passing through the automatic quality inspection unit, the metal, weight, and appearance defects are inspected and then enter the slitting and rolling process to obtain a nonwoven composite material. The nonwoven composite material has a weight of 60 gsm, a total content of two chemical fiber web layers of 13.3wt%, a content of SAF of 10.85wt%, a content of cellulose staple fibers of 65wt%, and a content of chemical filaments of 10.85wt%.

[0169] Example 5

[0170] The nonwoven composite material comprises, from bottom to top, a first chemical fiber mesh layer, a middle water-absorbing layer (two layers) and a second chemical fiber mesh layer.

[0171] (1) Modified PE particles, hydrophilic masterbatch, and styrene-butadiene-styrene triblock copolymer elastomer are mixed in a mass ratio of 75:5:20 to form a first mixed raw material, and polypropylene particles and hydrophilic masterbatch are mixed in a mass ratio of 95:5 to form a second mixed raw material; the two mixed raw materials are melted by separate screw extruders in a mass ratio of 1:1, transported to two adjacent melt cavities in the first spinning assembly 11 (spinning assembly No. 5), and ejected through corresponding spinnerets, and the ejected fibers are drawn onto the web curtain 4 by the hot air flow ejected from the gaps of the wind knives on both sides, and the two fibers are crossed to form a fiber web, thereby obtaining a first chemical fiber web layer. During the ejection process, the first spray system 12 disposed 20 cm below the spinneret is used to spray pure water for cooling, and the spraying amount is 150 L / h; the average fiber diameter of the first chemical fiber web layer is 2.4 μm, and the gram weight is 4 gsm.

[0172] (2) The polypropylene fibers are ejected from the second spinning assembly 22 (spinning assembly No. 1) and are drawn by the spinneret outer ring drafting airflow to obtain chemical filaments; the chemical filaments are cross-mixed with cellulose staple fibers and low-melting-point PE staple fibers (melting point is 110° C.) in the metal forming box 21, and the cross-fiber web area is controlled to account for more than 75% of the area of ​​the middle water-absorbing layer by the net bottom suction system 41, and the middle water-absorbing layer is formed on the net curtain 4 below the forming box 21. The drawing method is the spinneret outer ring drafting airflow drawing.

[0173] (3) Using the second core layer preparation unit, repeat the operation of step (2) on the surface of the middle water-absorbing layer to obtain a chemical fiber mesh layer-middle water-absorbing layer.

[0174] (4) Using the second surface layer preparation unit 3, the operation of step (1) is repeated on the surface of the chemical fiber mesh layer-intermediate water-absorbing layer to obtain a chemical fiber mesh layer-intermediate water-absorbing layer-chemical fiber mesh layer.

[0175] (5) The nonwoven composite material is transported to the heat device 5 through the web curtain 4 for heat drying (the drying temperature is set to 120°C), and then transported to the hot rolling mill 6 for hot rolling compounding (temperature 115°C, pressure 65bar). The pattern is designed as cartoon character pattern lines. After passing through the automatic quality inspection unit, the metal, gram weight, and appearance defects are inspected and then cut and rolled to obtain a nonwoven composite material. The nonwoven composite material has a gram weight of 60gsm, a total content of two layers of chemical fiber mesh layers of 13.3wt%, a content of low melting point PE short fibers of 13.35wt%, a content of cellulose short fibers of 60wt%, and a content of chemical filaments of 13.35wt%.

[0176] This embodiment is subjected to heat baking treatment by a heat device, which can stimulate the bonding effect of the low-melting-point PE fibers, reduce the phenomenon of fluff pulp shedding of the non-woven composite material, and can increase the strength performance of the non-woven composite material to a certain extent.

[0177] Example 6

[0178] The nonwoven composite material comprises, from bottom to top, a first chemical fiber mesh layer, a middle water-absorbing layer (two layers) and a second chemical fiber mesh layer.

[0179] (1) The polypropylene particles and the hydrophilic masterbatch are melted by separate screw extruders at a mass ratio of 95:5, and transported to the first spinning assembly 11 (spinning assembly No. 6) to be ejected through the spinneret. The ejected fibers are drawn by the hot air flow ejected from the gap between the wind knives on both sides, and the two fibers are cross-mixed with each other to form a first chemical fiber mesh layer on the mesh curtain 4. During the ejection process, the first spray system 12 arranged 20 cm below the spinneret is used to spray pure water for cooling, and the spraying volume is 120L / h; the average fiber diameter of the first chemical fiber mesh layer is 1.9μm and the gram weight is 3gsm. Since the fiber mesh ejected by this type of spinning assembly has a higher density, it can better wrap the middle water-absorbing layer to prevent the material in the middle water-absorbing layer from falling. On the other hand, it can increase the density of the fiber mesh and enhance the cleaning effect of the non-woven material.

[0180] (2) Polypropylene particles, hydrophilic masterbatch and biodegradable masterbatch are mixed in a mass ratio of 96:3:1, and the resulting mixture is melt-blown through a second spinning assembly 22 (spinning assembly No. 1), and is stretched by an outer ring stretching method of a spinneret to obtain chemical filaments; the chemical filaments are cross-mixed with cellulose staple fibers in a metal forming box 21, and the area of ​​the cross-fiber web is controlled to account for more than 75% of the area of ​​the middle water-absorbing layer through a net bottom suction system 41, and the cross-fiber web is formed on a net curtain 4 below the forming box 21 to form an middle water-absorbing layer.

[0181] (3) Using the second core layer preparation unit, repeat the operation of step (2) on the surface of the middle water-absorbing layer to obtain a chemical fiber mesh layer-middle water-absorbing layer.

[0182] (4) Using the second surface layer preparation unit 3, the operation of step (1) is repeated on the surface of the chemical fiber mesh layer-intermediate water-absorbing layer to obtain a chemical fiber mesh layer-intermediate water-absorbing layer-chemical fiber mesh layer.

[0183] (5) The web is transported to a hot rolling mill 6 through a web curtain 4 for hot rolling (temperature 125°C, pressure 75 bar), the pattern is a flower pattern line containing animal cartoon elements, and after passing through an automatic quality inspection unit, metal, weight, and appearance defect inspections are performed, and then the web is cut and rolled to obtain a nonwoven composite material. The nonwoven composite material has a weight of 55 gsm, a total content of two chemical fiber web layers of 10.9 wt%, a content of cellulose short fibers of 78.3 wt%, and a content of chemical filaments of 10.8 wt%.

[0184] Table 1 Performance test results of nonwoven composite materials prepared in Examples 1 to 6 and similar commercial products

[0185]

[0186]

[0187] Among them, similar products on the market were purchased from wet toilet paper products produced by Fujian Yifa Care Products Co., Ltd.

[0188] It can be seen from the data in Table 1 that the longitudinal strength of the non-woven composite material provided by the present invention is 12.56-48.3N, the longitudinal elongation is 30.8-58.3%, the transverse strength is 6.43-40.2N, the longitudinal elongation is 50.1-78.4%, the water absorption time is less than 16-36s, the water absorption ratio is 969-8532%, and the lint coefficient is 3.73-4.5, which shows that the non-woven composite material provided by the present invention has high strength, good anti-lint performance and strong water absorption.

[0189] The preparation method provided by the present invention has a production device with a special configuration of multiple raw material input ports and a special structure of a spinning assembly. A variety of raw materials can be used in the production process, and a special spatial structure allows the prepared non-woven composite material to have better fluffiness, strength, water absorption performance, and good anti-flocking performance. For example, in Example 2 and Example 3, SAP is added to the middle water-absorbing layer, so that the water absorption rate of the non-woven composite material is increased by 10 times compared with the commercially available product, and the coaxial melt-blown spinning assembly is used to give the non-woven composite material a better spatial structure. Combined with the density of the surface chemical fiber layer (the first chemical fiber mesh layer and the second chemical fiber mesh layer) and the various types of raw materials, the non-woven composite material has a significant increase in strength and a significant reduction in fluffing.

[0190] By comparing Example 4 and Example 5 with the same gram weight as commercial products, it can be concluded that the thickness of the non-woven composite material prepared by the present invention is increased by about 20%, and the change in the use of raw materials has greatly improved the strength and elongation. The use of SAF in Example 4 increases the water absorption rate of the non-woven composite material by about 3 times. In addition, the dense structure of the first chemical fiber mesh layer and the second chemical fiber mesh layer reduces the falling fluff to a certain extent. The use of low-melting-point fibers in Example 4 makes the non-woven composite material more binding to the cellulose staple fibers, and the anti-falling performance is significantly improved.

[0191] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A nonwoven composite material, characterized in that It comprises a first chemical fiber mesh layer, a middle water-absorbing layer and a second chemical fiber mesh layer which are stacked in sequence; The first chemical fiber web layer is a layered network structure formed by raw materials for preparing the first surface layer; the raw materials for preparing the first surface layer include a first thermoplastic polymer and a first functional masterbatch; The second chemical fiber web layer is a layered network structure formed by the raw materials for preparing the second surface layer; the raw materials for preparing the second surface layer include a second thermoplastic polymer and a second functional masterbatch; The middle water-absorbing layer is a cross-fiber web structure formed by the raw materials for preparing the core layer, and the raw materials for preparing the core layer include chemical filaments and short fibers; the area of ​​the cross-fiber web accounts for more than 50% of the area of ​​the middle water-absorbing layer.

2. The nonwoven composite material according to claim 1, characterized in that The average diameter of the fibers in the first chemical fiber web layer and the second chemical fiber web layer are independently 0.5 to 10 μm, and the gram weight is independently 0.1 to 10 gsm; The mass fraction of the first thermoplastic polymer in the raw material for preparing the first surface layer is 89.5-95%; The mass fraction of the second thermoplastic polymer in the raw material for preparing the second surface layer is 89.5-95%; The mass of the first chemical fiber web layer and the second chemical fiber web layer independently accounts for 3 to 20% of the mass of the nonwoven composite material; The raw materials for preparing the first surface layer and the raw materials for preparing the second surface layer further include functional additives, and the functional additives include one or more of a water absorbent, a softener and an antibacterial agent; the mass of the functional additives accounts for 0.2 to 8% of the mass of the non-woven composite material; The first surface layer preparation raw material and the second surface layer preparation raw material further include an antioxidant.

3. The nonwoven composite material according to claim 1, characterized in that The chemical filaments include one or more of polypropylene-based fibers, polyethylene-based fibers, polyethylene terephthalate-based fibers, styrene-butadiene-styrene triblock copolymer-based fibers, and ethylene-vinyl acetate copolymer-based fibers; The short fibers include one or more of cellulose short fibers, synthetic short fibers and super absorbent short fibers; The core layer preparation raw materials also include functional fillers, which include one or more of super absorbent fibers, low melting point fibers and super absorbent resins; the melting point of the low melting point fibers is ≤150°C; In the nonwoven composite material, the mass fraction of chemical filaments is 6.5-23.2%, and the mass fraction of short fibers is 20-69.6%; The number of layers of the intermediate water-absorbing layer is several.

4. The nonwoven composite material according to claim 1 or 3, characterized in that: The first thermoplastic polymer and the second thermoplastic polymer independently include one or more of polypropylene, modified polypropylene, polyethylene, modified polyethylene, polyethylene terephthalate, styrene-butadiene-styrene triblock copolymer and ethylene-vinyl acetate copolymer; The first functional masterbatch and the second functional masterbatch independently include one or more of a hydrophilic masterbatch, a biodegradable masterbatch, a soft masterbatch and an antibacterial masterbatch.

5. The method for preparing the nonwoven composite material according to any one of claims 1 to 4, characterized in that: The following steps are involved: The raw materials for preparing the first surface layer are heated until they are melted and then spun for the first time to obtain a first chemical fiber web layer; Performing a first cooling process during the first spinning process; Cross-mixing the raw materials for preparing the core layer, laying a web on the surface of the first chemical fiber mesh layer to form an intermediate water-absorbing layer having a cross fiber mesh, and obtaining a chemical fiber mesh layer-intermediate water-absorbing layer; The raw material for preparing the second surface layer is heated until it is melted, and a second chemical fiber mesh layer is formed by spinning on the surface of the intermediate water-absorbing layer of the chemical fiber mesh layer-intermediate water-absorbing layer to obtain a chemical fiber mesh layer-intermediate water-absorbing layer-chemical fiber mesh layer; Performing a second cooling process during the second spinning process; The chemical fiber mesh layer-middle water-absorbing layer-chemical fiber mesh layer are hot-rolled and composited to obtain the non-woven composite material.

6. The preparation method according to claim 5, characterized in that: The first cooling and the second cooling independently include atomizing spray cooling or cooling with cold air using a cooling liquid; the cooling liquid includes pure water or a functional additive solution; the spraying volume of the cooling liquid is 0 to 200 L / h; When the core layer preparation raw materials also include functional fillers, cross-mixing the chemical filaments, short fibers and functional fillers; The temperature of the hot rolling composite is 90-160°C.

7. Use of the nonwoven composite material according to any one of claims 1 to 4 or the nonwoven composite material prepared by the preparation method according to any one of claims 5 to 6 in disposable sanitary products or wipes.

8. A production device for the method for preparing the nonwoven composite material according to any one of claims 1 to 4 or the nonwoven composite material according to any one of claims 5 to 6, comprising a first surface layer preparation unit (1), a core layer preparation unit (2), a second surface layer preparation unit (3), a mesh curtain (4) and a hot rolling mill (6); The first surface layer preparation unit (1) is provided with a first spinning assembly (11) and a first spraying system (12); the first spinning assembly (11) comprises a coaxial melt-blown spinning assembly or an air knife draft spinning assembly; the first spinning assembly (11) comprises at least one melt cavity, each melt cavity being connected to a spinneret hole; The core layer preparation unit (2) is provided with a forming box (21); the forming box (21) is provided with a raw material inlet (23) and a raw material inlet pipe (25); The second surface layer preparation unit (3) comprises a third spinning assembly (31) and a second spray system (32); the third spinning assembly (31) comprises a coaxial melt-blown spinning assembly or an air knife draft spinning assembly; the third spinning assembly (31) comprises at least one melt cavity, each melt cavity being connected to a spinneret hole; The mesh material outlets of the first surface layer preparation unit (1), the core layer preparation unit (2) and the second surface layer preparation unit (3) are respectively connected to the mesh curtain (4); The mesh curtain (4) is provided with a mesh bottom air suction system (41).

9. The production device according to claim 8, characterized in that: The core layer preparation unit (2) is further provided with a second spinning assembly (22), a raw material adding system (24) and a defibrillation system (26); the fiber outlet of the second spinning assembly (22) is connected to the forming box (21); the second spinning assembly (22) comprises a coaxial melt-blown spinning assembly or an air knife drafting spinning assembly; the second spinning assembly (22) comprises at least one melt cavity, each melt cavity being connected to a spinneret hole; the defibrillation system (26) is arranged on the raw material inlet pipe (25); the forming box (21) is connected to the raw material adding system (24); the number of the second spinning assemblies (22) is 1 or 2; The number of the core layer preparation units (2) is several.

10. The production device according to claim 8 or 9, characterized in that: The production device also includes a heating device (5), a quality detection unit (7) and a winding and slitting unit (8).

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