Composite multilayer non-woven fabric and preparation method thereof

Abstract

The invention belongs to the technical field of non-woven materials, and particularly relates to a composite multi-layer non-woven fabric and a preparation method thereof. The composite multi-layer non-woven fabric comprises a first surface layer, a first wood pulp fiber layer, a first absorption outer layer, a second absorption outer layer, a second wood pulp fiber layer and a second surface layer which are sequentially stacked from top to bottom. The composite multi-layer non-woven fabric provided by the invention has more efficient oil and water absorption performance and has retention capacity after water and oil absorption, so that the defect that the traditional non-woven fabric is not easy to absorb water and oil is overcome. The composite multilayer non-woven fabric provided by the invention not only can be used for kitchen waste cleaning, but also can be used for industrial wiping, and can be used for manufacturing wet tissues and dry tissues.

Description

Technical Field

[0001] The invention belongs to the technical field of nonwoven materials, and particularly relates to a composite multi-layer nonwoven fabric and a preparation method thereof. Background Art

[0002] With the development of nonwoven fabric technology and the improvement of people's living standards, people's performance requirements for cleaning nonwoven fabrics are also increasing. As a common product in daily life, nonwoven fabrics have the characteristics of short process flow, high production efficiency, high output, low cost, wide application and multiple sources of raw materials.

[0003] At present, the raw materials of traditional non-woven fabrics are mainly polypropylene, which has the disadvantages of being non-degradable and not easy to absorb water and oil, and is therefore not popular among people. Summary of the Invention

[0004] The present invention aims to provide a composite multi-layer nonwoven fabric and a method for preparing the same. The composite multi-layer nonwoven fabric provided by the present invention is biodegradable and exhibits more efficient oil and water absorption properties, with a unique ability to retain water and oil after absorption, thereby overcoming the shortcomings of conventional nonwoven fabrics, which are limited in their ability to absorb water and oil. The composite multi-layer nonwoven fabric provided by the present invention can be used not only for cleaning kitchen waste but also for industrial wiping, and can be used to produce both wet wipes and dry wipes.

[0005] In order to achieve the above object, the present invention provides the following technical solutions: The present invention provides a composite multi-layer nonwoven fabric, comprising a first surface layer, a first wood pulp fiber layer, a first absorbent outer layer, a second absorbent outer layer, a second wood pulp fiber layer, and a second surface layer, which are sequentially stacked from top to bottom; The first surface layer or the second surface layer is a meltblown fiber web, the meltblown fiber web comprises first meltblown fibers and a functional additive, the raw materials for preparing the first meltblown fibers comprise a first thermoplastic polymer, a first degradable masterbatch and stain removal particles; the functional additive comprises a hydrophilic additive; The first absorbent outer layer or the second absorbent outer layer comprises a second meltblown fiber, and the raw materials for preparing the second meltblown fiber comprise a second thermoplastic polymer, a functional masterbatch and oil-absorbing resin particles, and the functional masterbatch comprises a second degradable masterbatch and a hydrophilic masterbatch.

[0006] Preferably, the stain removal particles include decyl glucoside, fatty alcohol polyoxyethylene ether and propylene glycol; the mass ratio of decyl glucoside, fatty alcohol polyoxyethylene ether and propylene glycol is 1:1:(1~1.5).

[0007] Preferably, the first thermoplastic polymer is a fully degradable thermoplastic polymer; The mass ratio of the first thermoplastic polymer to the first degradable masterbatch is (80-90): (1-3); The mass ratio of the first thermoplastic polymer to the stain removal particles is (80-90):(10-20); The total gram weight of the first surface layer and the second surface layer accounts for 5-25% of the gram weight of the composite multi-layer non-woven fabric.

[0008] Preferably, the raw materials for preparing the first melt-blown fiber further include a soft masterbatch; the mass ratio of the first thermoplastic polymer to the soft masterbatch is (80~90):(1~3).

[0009] Preferably, the functional additives further include an antibacterial additive and / or a softening additive, and the total mass of the functional additives in the first surface layer and the second surface layer accounts for 0.1 to 1.2% of the total mass of the composite multi-layer nonwoven fabric.

[0010] Preferably, the second thermoplastic polymer is a completely degradable thermoplastic polymer; the functional masterbatch further comprises a tackifying masterbatch; the oil-absorbing resin particles comprise polyacrylate oil-absorbing resin particles; The mass ratio of the second thermoplastic polymer to the second degradable masterbatch is (80-90): (1-3); The mass ratio of the second thermoplastic polymer to the hydrophilic masterbatch is (80-90): (5-10); The mass ratio of the second thermoplastic polymer to the tackifying masterbatch is (80-90): (5-10); The mass ratio of the second thermoplastic polymer to the oil absorbing resin particles is (80-90): (5-10); The percentage of the gram weight of the first absorbent outer layer or the gram weight of the second absorbent outer layer to the total gram weight of the composite multi-layer non-woven fabric is 4-12%.

[0011] Preferably, the composite multi-layer non-woven fabric also includes an absorption layer, which is arranged between the first absorption outer layer and the second absorption outer layer; the absorption layer includes natural wood pulp fibers, and the gram weight of the absorption layer accounts for 35~45% of the total gram weight of the composite multi-layer non-woven fabric.

[0012] Preferably, the first wood pulp fiber layer or the second wood pulp fiber layer comprises natural fluff pulp fibers; The percentage of the gram weight of the first wood pulp fiber layer or the gram weight of the second wood pulp fiber layer to the total gram weight of the composite multi-layer non-woven fabric is 10-42%.

[0013] The present invention provides a method for preparing the composite multi-layer nonwoven fabric described in the above technical solution, comprising the following steps: (1) preparing an initial second surface layer by a melt-blowing method, and then spraying and drying the initial second surface layer in sequence to obtain a second surface layer, wherein the spraying treatment uses a spray liquid, and the spray liquid includes a functional additive and water; (2) preparing a second wood pulp fiber layer on the upper surface of the second surface layer; (3) preparing a second absorbent outer layer on the upper surface of the second wood pulp fiber layer by melt-blowing; (4) preparing a first absorbent outer layer on the upper surface of the second absorbent outer layer by meltblowing; (5) preparing a first wood pulp fiber layer on the upper surface of the first absorbent outer layer; (6) preparing an initial first surface layer on the upper surface of the first wood pulp fiber layer by a melt-blowing method, and then spraying and drying the initial first surface layer in sequence to obtain a first surface layer, wherein the spraying treatment uses a spray liquid, and the spray liquid includes a functional additive and water; obtaining a multilayer structure product; (7) Hot rolling the multi-layer structure product to obtain the composite multi-layer nonwoven fabric.

[0014] Preferably, in step (1) or step (6), the mass percentage of the functional additive in the spray liquid is 0.5-6%; the spraying volume of the spray liquid is 80-200 L / H; In step (1) or step (6), the drying is hot air drying, and the conditions of the hot air drying include: the hot air temperature is 200~260℃, and the hot air volume is 2000~5500m³ / h.

[0015] The present invention provides a composite multi-layer non-woven fabric, comprising a first surface layer, a first wood pulp fiber layer, a first absorbent outer layer, a second absorbent outer layer, a second wood pulp fiber layer, and a second surface layer stacked in sequence from top to bottom; the first surface layer or the second surface layer is a meltblown fiber web, the meltblown fiber web comprises first meltblown fibers and a functional additive, the raw materials for preparing the first meltblown fibers comprise a first thermoplastic polymer, a first degradable masterbatch, and stain removal particles, and the functional additive comprises a hydrophilic additive; the first absorbent outer layer or the second absorbent outer layer comprises second meltblown fibers, the raw materials for preparing the second meltblown fibers comprise a second thermoplastic polymer, a functional masterbatch, and oil-absorbing resin particles, and the functional masterbatch comprises a second degradable masterbatch and a hydrophilic masterbatch. The present invention adds stain removal particles and hydrophilic additives to the first surface layer and the second surface layer. The stain removal particles can emulsify the oil-water mixture that is difficult to absorb on the surface, quickly disintegrate the stains on the contact surface, effectively promote the maximum absorption of the stains, and further reduce the amount of debris falling during the wiping process. By combining the stain removal particles and the hydrophilic additives, the two surface layers of the composite multi-layer non-woven fabric can have more efficient oil and water absorption properties; the present invention arranges a wood pulp fiber layer (a first wood pulp fiber layer and a second wood pulp fiber layer) between the surface layer (the first surface layer and the second surface layer) and the absorbent outer layer (the first absorbent outer layer and the second absorbent outer layer). The wood pulp fiber layer can not only serve as a bridge connecting the surface layer and the absorbent outer layer, but also the wood pulp fiber layer utilizes its high porosity to absorb the oil and water. The characteristics can further promote the oil and water absorption characteristics of the composite multi-layer non-woven fabric. At the same time, due to the porosity of the wood pulp fiber layer, the wood pulp fiber layer also has a unique retention capacity after absorbing water and oil. The present invention adds oil-absorbing resin particles and hydrophilic masterbatch in the first absorption outer layer and the second absorption outer layer. The hydrophilic masterbatch can further enhance the water absorption and diffusion capacity from the surface layer to the inner layer. At the same time, the oil-absorbing resin particles achieve the purpose of oil absorption through the van der Waals force generated between the lipophilic group and the oil molecules. Its oil absorption mechanism is the solvation process of the polymer chain segment. When the oil-absorbing resin contacts the oil film, the initial stage is molecular diffusion control. After absorbing a certain amount of oil, a stable physical bond is formed between the oil molecules and the polymer chain segments, which has the characteristics of multiple oil absorption types, large oil absorption amount, and strong oil retention capacity. In addition, the composite multi-layer non-woven fabric provided by the present invention contains a first degradable masterbatch and a second degradable masterbatch, and the resulting composite multi-layer non-woven fabric has degradable characteristics. In summary, the composite multi-layer nonwoven fabric provided by the present invention is biodegradable and has more efficient oil and water absorption properties. It also has a unique ability to retain water and oil after absorption, thus overcoming the shortcomings of traditional nonwoven fabrics that are not easily absorbed by water and oil. The composite multi-layer nonwoven fabric provided by the present invention can be used not only for household kitchen waste but also for industrial wiping, and can be used to produce both wet wipes and dry wipes.

[0016] Furthermore, in the present invention, the functional masterbatch also includes a tackifying masterbatch. The present invention further adds a tackifying masterbatch to the first absorbent outer layer and the second absorbent outer layer. The tackifying masterbatch added to the absorbent outer layer strengthens the bonding ability between the absorbent outer layer and the wood pulp fiber layer, making the absorbent outer layer and the wood pulp fiber layer firmly bonded without affecting the absorption performance between the layers. At the same time, it also reduces the looseness or unevenness of the inner layer fibers during the meltblowing process of the absorbent outer layer, further reduces the uneven absorption caused by the displacement of the wood pulp fiber layer fibers due to friction deformation during the wiping process, and further reduces the generation of debris during the wiping process.

[0017] Furthermore, in the present invention, the composite multi-layer nonwoven fabric further includes an absorbent layer, disposed between the first and second absorbent outer layers; the absorbent layer comprises natural wood pulp fibers. When the composite multi-layer nonwoven fabric provided by the present invention further includes an absorbent layer, the absorbent outer layer acts as a bridge connecting the wood pulp fiber layer and the absorbent layer, more fully directing oil and water released from the absorbent outer layer into the absorbent layer, thereby effectively increasing the composite multi-layer nonwoven fabric's oil and water absorption capacity and improving its oil and water absorption efficiency. Furthermore, by providing the absorbent layer, the present invention can increase the overall thickness of the product, enhance the product's sense of heaviness, and improve the consumer experience.

[0018] Furthermore, in the present invention, the raw materials for preparing the first meltblown fiber also include softening masterbatch. By adding softening masterbatch to the meltblown fiber web on both surfaces, the present invention can significantly improve the softness of the product and give the product surface a soft and dry feel. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of the distribution of each layer of the cross-section of the composite multi-layer nonwoven fabric provided in Examples 1 and 2 of the present invention; Figure 2 A schematic diagram of the distribution of each layer of the cross-section of the composite multi-layer nonwoven fabric provided in Example 3 of the present invention; Figure 3 Schematic diagram of an enlarged cross section of the outer three layers of the composite multi-layer nonwoven fabric provided in Examples 1 to 3 of the present invention; Figure 4 A schematic diagram of the structures of the spraying system and hot air drying system provided by the present invention; Figure 5 Schematic diagram of the structure of the absorption layer and the absorption outer layer of the present invention; In the figure: 1 is the first surface layer; 2 is the first wood pulp fiber layer; 3 is the first absorbent outer layer; 4 is the absorbent layer; 5 is the second absorbent outer layer; 6 is the second wood pulp fiber layer; 7 is the second surface layer; 8 is the oil-absorbing resin particles; 9 is the oil-absorbing resin aggregate; 10 is the mesh curtain, 11 is the first spray head, 12 is the second spray head, 13 is the hot air hole, 14 is the hot air drying system, 15 is natural wood pulp fiber, and 16 is hot air. DETAILED DESCRIPTION

[0020] The present invention provides a composite multi-layer nonwoven fabric, comprising a first surface layer, a first wood pulp fiber layer, a first absorbent outer layer, a second absorbent outer layer, a second wood pulp fiber layer, and a second surface layer, which are sequentially stacked from top to bottom; The first surface layer or the second surface layer is a meltblown fiber web, the meltblown fiber web comprises first meltblown fibers and a functional additive, the raw materials for preparing the first meltblown fibers comprise a first thermoplastic polymer, a first degradable masterbatch and stain removal particles, and the functional additive comprises a hydrophilic additive; The first absorbent outer layer or the second absorbent outer layer comprises a second meltblown fiber, and the raw materials for preparing the second meltblown fiber comprise a second thermoplastic polymer, a functional masterbatch and oil-absorbing resin particles, and the functional masterbatch comprises a second degradable masterbatch and a hydrophilic masterbatch.

[0021] In the present invention, unless otherwise specified, all preparation raw materials / components are commercially available products well known to those skilled in the art.

[0022] The composite multi-layer nonwoven fabric provided by the present invention includes a first surface layer. In the present invention, the first surface layer includes a first meltblown fiber and a functional additive. The raw materials for preparing the first meltblown fiber include a first thermoplastic polymer, a first degradable masterbatch, and stain removal particles. The functional additive includes a hydrophilic additive. The first thermoplastic polymer is preferably a fully degradable thermoplastic polymer. The fully degradable thermoplastic polymer preferably includes one or more of polypropylene, polylactic acid (PLA), and polybutylene succinate (PBS); in embodiments, polypropylene and polylactic acid can be used. The first degradable masterbatch is preferably a masterbatch of the first thermoplastic polymer that can fully degrade. When the fully degradable thermoplastic polymer is preferably any two of the above substances, the mass ratio of the above two substances is preferably 50:33.

[0023] In the present invention, the mass ratio of the first thermoplastic polymer to the first degradable masterbatch is preferably (80-90):(1-3), and in embodiments may be 83:2 or 81:2.

[0024] In the present invention, the stain removal particles preferably include decyl glucoside (APG), fatty alcohol polyoxyethylene ether, and propylene glycol; the mass ratio of decyl glucoside, fatty alcohol polyoxyethylene ether, and propylene glycol is preferably 1:1:(1-1.5), and in embodiments, it can be 1:1:1.2. The mass ratio of the first thermoplastic polymer to the stain removal particles is preferably (80-90):(10-20), and in embodiments, it can be 83:15 or 81:15.

[0025] In the present invention, the stain removal particles play a role in rapidly breaking down stains on the contact surface, effectively promoting maximum absorption of the stains, and further reducing the amount of debris falling during the wiping process.

[0026] In the present invention, the raw materials used to prepare the first meltblown fiber preferably also include a softening masterbatch. The mass ratio of the first thermoplastic polymer to the softening masterbatch is preferably (80-90):(1-3), and in some embodiments, it can be 81:2. In the present invention, the addition of the softening masterbatch in a relatively low mass significantly improves the softness of the product, imparting a soft, dry feel to the surface.

[0027] In the present invention, the diameter of the first melt-blown fibers is preferably 1.2 to 8.5 μm.

[0028] In the present invention, the functional additives include a hydrophilic additive. The hydrophilic additive can effectively reduce the surface tension of water molecules when the first surface layer comes into contact with water molecules, accelerate the diffusion of water molecules on the surface of the first surface layer, effectively improve the water absorption properties of the chemical fibers in the first surface layer, and quickly penetrate into the first wood pulp fiber layer, maximizing the water absorption properties of the first wood pulp fiber layer. The functional additives preferably also include an antimicrobial additive and / or a softening additive. When two or three functional additives are present, the present invention has no specific requirements for the mass ratio of the two or three functional additives.

[0029] In the present invention, the percentage of the mass of the functional additive in the first surface layer to the total mass of the composite multi-layer nonwoven fabric is preferably equal to the percentage of the mass of the functional additive in the second surface layer to the total mass of the composite multi-layer nonwoven fabric.

[0030] In the present invention, the total mass of the functional additives in the first surface layer and the second surface layer accounts for preferably 0.1-1.2% of the total mass of the composite multi-layer nonwoven fabric, and in an embodiment may be 0.5%.

[0031] In the present invention, the first surface layer is preferably a fiber web formed by first melt-blown fibers, and a functional additive is distributed in the fiber web formed by the first melt-blown fibers.

[0032] In the present invention, the gram weight of the first surface layer or the second surface layer is preferably 3.5-12.5 gsm, more preferably 4-10 gsm, and in embodiments may be 8 gsm, 5 gsm or 4 gsm.

[0033] In the present invention, the first surface layer and the second surface layer have the same gram weight.

[0034] In the present invention, the total gram weight of the first surface layer and the second surface layer preferably accounts for 5-25% of the gram weight of the composite multi-layer nonwoven fabric, more preferably 8-12%, and in embodiments may be 16.7%, 10.2% or 8.2%.

[0035] The present invention increases the weight ratio of the first surface layer and the second surface layer in the composite multi-layer non-woven fabric, thereby enhancing its friction resistance during the wiping process, strengthening its ability to remove stubborn stains, and effectively reducing the problem of surface damage during the wiping process. At the same time, the first surface layer and the second surface layer are arranged on the outermost layer, which covers and protects the inner structural layer to prevent liquid seepage after absorbing water and oil.

[0036] The composite multi-layer nonwoven fabric provided by the present invention comprises a first wood pulp fiber layer disposed on the lower surface of the first surface layer. In the present invention, the first wood pulp fiber layer preferably comprises natural fluff pulp fibers.

[0037] In the present invention, the gram weight of the first wood pulp fiber layer is preferably 10-40 gsm, and in embodiments may be 10 gsm, 20 gsm or 35 gsm.

[0038] In the present invention, the grammage of the first wood pulp fiber layer and the grammage of the second wood pulp fiber layer are preferably equal.

[0039] In the present invention, the percentage of the gram weight of the first wood pulp fiber layer or the gram weight of the second wood pulp fiber layer to the total gram weight of the composite multi-layer non-woven fabric is preferably 10-42%, more preferably 10-36%, and in embodiments may be 10.4%, 20.4% or 35.7%.

[0040] In the present invention, a first wood pulp fiber layer is fixedly connected between the first surface layer and the first absorbent outer layer, thereby improving the overall softness of the composite multi-layer nonwoven fabric, making it fluffier and thicker than comparable specifications at a given total weight. Furthermore, the first wood pulp fiber layer has excellent water and oil absorption properties, reducing the absorption time from the first surface layer to the first absorbent outer layer.

[0041] The composite multi-layer nonwoven fabric provided by the present invention includes a first absorbent outer layer disposed on the lower surface of the first wood pulp fiber layer. In the present invention, the first absorbent outer layer includes a second meltblown fiber. The raw materials for preparing the second meltblown fiber include a second thermoplastic polymer, a functional masterbatch, and oil-absorbing resin particles. The functional masterbatch includes a second degradable masterbatch and a hydrophilic masterbatch. In the present invention, the second thermoplastic polymer is preferably a fully degradable thermoplastic polymer. The fully degradable thermoplastic polymer preferably includes one or more of polypropylene (PP), polylactic acid (PLA), and polybutylene succinate (PBS), and in embodiments, may be polypropylene and polylactic acid. When the fully degradable thermoplastic polymer is preferably any two of the above substances, the mass ratio of the above two substances is preferably 50:33.

[0042] In the present invention, the functional masterbatch includes a second degradable masterbatch and a hydrophilic masterbatch, and the second degradable masterbatch is preferably a masterbatch that can completely degrade the second thermoplastic polymer.

[0043] In the present invention, the mass ratio of the second thermoplastic polymer to the second degradable masterbatch is preferably (80-90):(1-3), and in an embodiment can be 83:2.

[0044] In the present invention, the hydrophilic masterbatch can further enhance the water absorption and diffusion capacity between the first surface layer and the first absorbent outer layer. In the present invention, the mass ratio of the second thermoplastic polymer to the hydrophilic masterbatch is preferably (80-90): (5-10), and in an embodiment, it can be 83:5.

[0045] In the present invention, the functional masterbatch preferably also includes a tackifying masterbatch. The tackifying masterbatch further strengthens the bonding between the first wood pulp fiber layer, the first absorbent outer layer, and the absorbent layer, ensuring a firm bond without affecting the absorption performance of the layers. This reduces loose or uneven fibers in the inner layer during the meltblowing process when preparing the first absorbent outer layer. It also further reduces uneven absorption caused by frictional deformation during wiping, which shifts the wood pulp fibers within the first absorbent outer layer and further reduces the generation of debris during wiping. In the present invention, the mass ratio of the second thermoplastic polymer to the tackifying masterbatch is preferably (80-90):(5-10), and in embodiments it can be 83:5.

[0046] In the present invention, the oil-absorbing resin particles preferably include polyacrylate-based oil-absorbing resin particles, more preferably polyacrylate-based high-absorbency resin particles with a low three-dimensional network chemical crosslinking structure. These oil-absorbing resin particles achieve oil absorption through van der Waals forces generated between lipophilic groups and oil molecules. The oil absorption mechanism is a solvation process involving polymer segments. When the oil-absorbing resin particles come into contact with an oil film, molecular diffusion control is initially employed. After absorbing a certain amount of oil, stable physical bonds are formed between the oil molecules and the polymer segments. These particles possess the advantages of absorbing a wide variety of oil types, absorbing large amounts of oil, and maintaining strong oil retention. In the present invention, the mass ratio of the second thermoplastic polymer to the oil-absorbing resin particles is preferably (80-90):(5-10), and in embodiments, it can be 83:10 or 83:5.

[0047] In the present invention, the mass of the second melt-blown fibers is preferably 1.2 to 8.5 μm.

[0048] In the present invention, the first absorbent outer layer is preferably a fiber web formed by the second meltblown fibers. The first absorbent outer layer preferably has a grammage of 1.5 to 10.5 gsm, and in embodiments may be 10 gsm or 4 gsm.

[0049] In the present invention, the grammage of the first absorbent outer layer and the grammage of the second absorbent outer layer are preferably equal.

[0050] In the present invention, the percentage of the gram weight of the first absorbent outer layer or the gram weight of the second absorbent outer layer to the total gram weight of the composite multi-layer nonwoven fabric is preferably 4-12%, and in embodiments may be 4.2% or 10.4%.

[0051] The composite multi-layer nonwoven fabric provided by the present invention preferably includes an absorbent layer disposed on the lower surface of the first absorbent outer layer. In the present invention, the absorbent layer is preferably disposed between the first absorbent outer layer and the second absorbent outer layer. The absorbent layer preferably includes natural wood pulp fibers.

[0052] In the present invention, the weight of the absorbent layer is preferably 30-100 gsm, more preferably 35-45 gsm, and in the embodiment, 40 gsm.

[0053] In the present invention, the percentage of the gram weight of the absorbent layer to the total gram weight of the composite multi-layer nonwoven fabric is preferably 35-45%, and in embodiments may be 41.7% or 40.8%.

[0054] The composite multi-layer nonwoven fabric provided by the present invention includes a second absorbent outer layer provided on the first absorbent outer layer or the lower surface of the absorbent layer. In the present invention, the preferred range of the second absorbent outer layer is the same as that of the first absorbent outer layer, which will not be repeated here.

[0055] The composite multi-layer nonwoven fabric provided by the present invention includes a second wood pulp fiber layer disposed on the lower surface of the second absorbent outer layer. In the present invention, the preferred range of the second wood pulp fiber layer is the same as that of the first wood pulp fiber layer, which will not be repeated here.

[0056] The composite nonwoven fabric provided by the present invention includes a second surface layer disposed on the lower surface of the second wood pulp fiber layer. In the present invention, the preferred range of the second surface layer is the same as the preferred range of the first surface layer, which will not be repeated here.

[0057] As one or more embodiments of the present invention, the composite multi-layer nonwoven fabric includes a first surface layer, a first wood pulp fiber layer, a first absorbent outer layer, a second absorbent outer layer, a second wood pulp fiber layer, and a second surface layer stacked in sequence from top to bottom.

[0058] As one or more embodiments of the present invention, the composite multi-layer nonwoven fabric includes a first surface layer, a first wood pulp fiber layer, a first absorbent outer layer, an absorbent layer, a second absorbent outer layer, a second wood pulp fiber layer, and a second surface layer stacked in sequence from top to bottom.

[0059] In the present invention, the total gram weight of the composite multi-layer nonwoven fabric is preferably 30-221 gsm, more preferably 80-200 gsm, further preferably 90-100 gsm, and in embodiments may be 96 gsm or 98 gsm.

[0060] In the present invention, the total mass content of the thermoplastic polymer in the composite multi-layer nonwoven fabric is preferably 20-80%. The total mass content of the wood pulp fiber in the composite multi-layer nonwoven fabric is preferably 20-80%. The sum of the mass of the thermoplastic polymer and the wood pulp fiber is less than 100%.

[0061] The composite multi-layer nonwoven fabric provided by the present invention preferably uses wood pulp fibers, adds stain removal particles, hydrophilic additives, oil-absorbing resin particles, and hydrophilic masterbatch, and is simultaneously matched with softening masterbatch and tackifying masterbatch. It can have more efficient oil and water absorption performance. The unique porosity of wood pulp fibers makes the product thicker and has a unique retention ability after absorbing water and oil. Compared with traditional nonwoven fabrics, the composite multi-layer nonwoven fabric product provided by the present invention has a more velvety surface. By adding degradable masterbatch and wood pulp fibers, the present invention can make the product biodegradable. The product can be used not only for kitchen waste life, but also for industrial wiping. It can be used for the production of wet wipes or dry wipes, which is more in line with the current demand for green and light living.

[0062] The present invention provides a method for preparing the composite multi-layer nonwoven fabric described in the above technical solution, comprising the following steps: (1) preparing an initial second surface layer by a melt-blowing method, and then spraying and drying the initial second surface layer in sequence to obtain a second surface layer, wherein the spraying treatment uses a spray liquid, and the spray liquid includes a functional additive and water; (2) preparing a second wood pulp fiber layer on the upper surface of the second surface layer; (3) preparing a second absorbent outer layer on the upper surface of the second wood pulp fiber layer by melt-blowing; (4) preparing a first absorbent outer layer on the upper surface of the second absorbent outer layer by meltblowing; (5) preparing a first wood pulp fiber layer on the upper surface of the first absorbent outer layer; (6) preparing an initial first surface layer on the upper surface of the first wood pulp fiber layer by a melt-blowing method, and then spraying and drying the initial first surface layer in sequence to obtain a first surface layer, wherein the spraying treatment uses a spray liquid, and the spray liquid includes a functional additive and water; obtaining a multilayer structure product; (7) Hot rolling the multi-layer structure product to obtain the composite multi-layer nonwoven fabric.

[0063] The present invention uses a meltblowing method to prepare an initial second surface layer, and then sequentially sprays and dries the initial second surface layer to obtain a second surface layer. The spraying method uses a spray liquid comprising a functional additive and water. The present invention has no special requirements for the meltblowing method. In the present invention, the spraying method preferably uses an online spraying method. The spraying method preferably uses a spraying system, and the drying method preferably uses a hot air drying system. The hot air drying system is preferably located above the mesh curtain. The spraying systems are preferably located upstream and downstream of the hot air drying system. The height of the spraying system from the mesh curtain is less than the height of the hot air drying system from the mesh curtain, and the vertical distance between the spraying system and the hot air drying system is 10 to 40 cm. The hot air from the hot air drying system is ejected vertically downward. The angle between the ejection direction of the spraying system and the ejection direction of the hot air from the hot air drying system is preferably 80 to 150 degrees. The water mist sprayed out by the spray system through the nozzle is preferably fan-shaped, so that it is evenly sprayed into the initial second surface layer, ensuring the maximum area of ​​the melt-blown mesh layer covered, reducing the temperature after meshing, and improving the strength of the melt-blown fiber. The mass percentage of the functional additive in the spray liquid is preferably 0.5~6%. The spray volume of the spray liquid is preferably 80~200L / H. In the present invention, the drying is preferably hot air drying, and the conditions for the hot air drying preferably include: the hot air temperature is preferably 200~260℃, and the hot air volume is preferably 2000~5500m³ / h. The present invention ensures temperature uniformity and production efficiency by controlling the temperature and time of hot air drying, which can effectively dry the residual moisture on the surface of the material, improve the bonding between the layers of the composite multi-layer non-woven fabric, and improve the mechanical properties.

[0064] After obtaining the second surface layer, the present invention prepares a second wood pulp fiber layer on the upper surface of the second surface layer. The present invention has no special requirements on the preparation method of the second wood pulp fiber layer.

[0065] After obtaining the second wood pulp fiber layer, the present invention uses a melt-blowing method to prepare a second absorbent outer layer on the upper surface of the second wood pulp fiber layer. The present invention has no special requirements for the melt-blowing method.

[0066] After obtaining the second outer absorbent layer, the present invention preferably prepares an absorbent layer on the upper surface of the second outer absorbent layer. The present invention has no special requirements on the preparation method of the absorbent layer.

[0067] After obtaining the second absorbent outer layer or absorbent layer, the present invention uses a melt-blowing method to prepare the first absorbent outer layer on the upper surface of the second absorbent outer layer or absorbent layer. The present invention has no special requirements for the melt-blowing method.

[0068] After obtaining the first absorbent outer layer, the present invention prepares a first wood pulp fiber layer on the upper surface of the first absorbent outer layer. The present invention has no special requirements on the preparation method of the first wood pulp fiber layer.

[0069] After obtaining the first wood pulp fiber layer, the present invention uses a meltblowing method to prepare an initial first surface layer on the upper surface of the first wood pulp fiber layer. The initial first surface layer is then sprayed and dried in sequence to obtain a first surface layer. The spraying treatment uses a spray liquid comprising a functional additive and water to obtain a multilayer structure product. The preparation method of the first surface layer is the same as the preparation method of the second surface layer and will not be repeated here.

[0070] After obtaining the multilayer structure product, the present invention performs hot rolling on the multilayer structure product to obtain the composite multilayer nonwoven fabric. The present invention has no special requirements on the specific implementation of the hot rolling, and conventional operating temperature and time well known to those skilled in the art can be used.

[0071] In order to further illustrate the present invention, the technical solutions provided by the present invention are described in detail below in conjunction with the embodiments, but they should not be construed as limiting the scope of protection of the present invention.

[0072] The polypropylene (PP) particles used in the following examples were purchased from LyondellBasell Industries. The hydrophilic additive was purchased from Lurui Fine Chemicals Co., Ltd. The biodegradable masterbatch was purchased from Indoramaventures. The soft masterbatch was purchased from Jiangsu Pleco Hongmei Color Masterbatch Co., Ltd. The hydrophilic masterbatch was purchased from Changzhou Wangyi New Material Technology Co., Ltd. The tackifying masterbatch was purchased from Changzhou Wangyi New Material Technology Co., Ltd. The oil-absorbing resin particles, which are highly oil-absorbing polyacrylic resin particles with a low three-dimensional network chemical cross-linking structure, were purchased from Changzhou Wangyi New Material Technology Co., Ltd. Polylactic acid (PLA) was purchased from Changzhou Wangyi New Material Technology Co., Ltd.

[0073] Example 1: refer to Figure 1 As shown in the structure, this embodiment provides a composite multi-layer non-woven fabric. The structure of the composite multi-layer non-woven fabric provided in this embodiment is, from top to bottom, a first surface layer 1, a first wood pulp fiber layer 2, a first absorbent outer layer 3, an absorbent layer 4, a second absorbent outer layer 5, a second wood pulp fiber layer 6, and a second surface layer 7.

[0074] In this embodiment, the first surface layer 1 has a weight of 8 gsm. The first wood pulp fiber layer 2 has a weight of 10 gsm. The first absorbent outer layer 3 has a weight of 10 gsm. The absorbent layer 4 has a weight of 40 gsm. The second absorbent outer layer 5 has a weight of 10 gsm. The second wood pulp fiber layer 6 has a weight of 10 gsm. The second surface layer 7 has a weight of 8 gsm. The total weight of the composite multi-layer nonwoven fabric provided in this embodiment is 96 gsm.

[0075] In this embodiment, the first and second surface layers 1 and 7 are meltblown fiber webs comprising meltblown fibers and a hydrophilic additive. The meltblown fibers of the first and second surface layers 1 and 7 are meltblown by mixing polypropylene particles, polylactic acid, stain-removing particles, and a degradable masterbatch in a mass ratio of 50:33:15:2. The fibers of the first and second surface layers 1 and 7 have a diameter ranging from 1.2 to 3.5 μm. The stain-removing particles are composed of decyl glucoside, fatty alcohol polyoxyethylene ether, and propylene glycol in a mass ratio of 1:1:1.2.

[0076] In this embodiment, the first wood pulp fiber layer 2 and the second wood pulp fiber layer 6 are composed of natural fluff pulp fibers.

[0077] In this embodiment, the first and second absorbent outer layers 3 and 5 are meltblown fiber webs formed by meltblowing a mixture of polypropylene particles, polylactic acid, a degradable masterbatch, a hydrophilic masterbatch, and oil-absorbing resin particles in a mass ratio of 50:33:2:5:10. The fibers in the first and second absorbent outer layers 3 and 5 have a diameter ranging from 2.2 to 4.5 μm.

[0078] In this embodiment, the absorbent layer 4 is made of natural fluff pulp fibers. The high-weight absorbent layer 4 in this embodiment greatly increases the thickness of the composite multi-layer nonwoven fabric product provided by this embodiment.

[0079] The preparation method of the composite multi-layer nonwoven fabric provided in this embodiment specifically includes: An initial second surface layer is prepared on a mesh curtain using a meltblowing method. This initial second surface layer is then sprayed and dried to obtain a second surface layer. The spraying is performed using a spray system with a spray liquid containing a hydrophilic additive and water. The hydrophilic additive content of the spray liquid is 6% by weight, and the spray volume is 160 L / H. After spraying the hydrophilic additive, a hot air drying system is used for hot air drying at a temperature of 230°C and a hot air volume of 3000 m³ / h.

[0080] After obtaining the second surface layer, in this embodiment, a second wood pulp fiber layer is prepared on the upper surface of the second surface layer.

[0081] After obtaining the second wood pulp fiber layer, in this embodiment, a second absorbent outer layer is prepared on the upper surface of the second wood pulp fiber layer by melt-blowing.

[0082] After obtaining the second outer absorbent layer, the present invention prepares an absorbent layer on the upper surface of the second outer absorbent layer.

[0083] After obtaining the absorbent layer, in this embodiment, a first absorbent outer layer is prepared on the upper surface of the absorbent layer by a melt-blowing method.

[0084] After obtaining the first absorbent outer layer, in this embodiment, a first wood pulp fiber layer is prepared on the upper surface of the first absorbent outer layer.

[0085] After obtaining the first wood pulp fiber layer, in this embodiment, an initial first surface layer was prepared on the upper surface of the first wood pulp fiber layer using a meltblowing method. The initial first surface layer was then sprayed and dried in sequence to obtain the first surface layer. The spraying was performed using a spray system using a spray liquid comprising a hydrophilic additive and water. The mass content of the hydrophilic additive in the spray liquid was 6%, and the spray volume was 160 L / H. After spraying the hydrophilic additive, hot air drying was performed using a hot air drying system at a temperature of 230°C and a hot air volume of 3000 m³ / h.

[0086] In this embodiment, the total mass of the hydrophilic additives in the first surface layer and the second surface layer accounts for 0.5% of the total mass of the composite multi-layer non-woven fabric.

[0087] After obtaining the multi-layer structure product, in this embodiment, the multi-layer structure product is hot-rolled to obtain a composite multi-layer non-woven fabric.

[0088] Example 2: refer to Figure 1 As shown in the structure, this embodiment provides a composite multi-layer non-woven fabric. The structure of the composite multi-layer non-woven fabric provided in this embodiment is, from top to bottom, a first surface layer 1, a first wood pulp fiber layer 2, a first absorbent outer layer 3, an absorbent layer 4, a second absorbent outer layer 5, a second wood pulp fiber layer 6, and a second surface layer 7.

[0089] In this embodiment, the first surface layer 1 has a weight of 5 gsm. The first wood pulp fiber layer 2 has a weight of 20 gsm. The first absorbent outer layer 3 has a weight of 4 gsm. The absorbent layer 4 has a weight of 40 gsm. The second absorbent outer layer 5 has a weight of 4 gsm. The second wood pulp fiber layer 6 has a weight of 20 gsm. The second surface layer 7 has a weight of 5 gsm. The total weight of the composite multi-layer nonwoven fabric provided in this embodiment is 98 gsm.

[0090] In this embodiment, the first and second surface layers 1 and 7 are meltblown fiber webs comprising meltblown fibers and a hydrophilic additive. The meltblown fibers of the first and second surface layers 1 and 7 are meltblown by mixing polypropylene particles, polylactic acid, a degradable masterbatch, stain-removing particles, and a softening masterbatch in a mass ratio of 50:31:2:15:2. The fiber diameters of the first and second surface layers 1 and 7 range from 1.2 to 3.5 μm. The stain-removing particles are composed of decyl glucoside, fatty alcohol polyoxyethylene ether, and propylene glycol in a mass ratio of 1:1:1.2.

[0091] In this embodiment, the first wood pulp fiber layer 2 and the second wood pulp fiber layer 6 are composed of natural fluff pulp fibers.

[0092] In this embodiment, the first absorbent outer layer 3 and the second absorbent outer layer 5 are meltblown fiber webs. The meltblown fiber webs are formed by meltblowing polypropylene particles, polylactic acid, a degradable masterbatch, a hydrophilic masterbatch, a tackifying masterbatch, and oil-absorbing resin particles in a mass ratio of 50:33:2:5:5:5. The polypropylene particles are composed of low-melt index polypropylene particles. The fibers produced by blending low-melt index polypropylene particles with the tackifying masterbatch have high fiber strength and better adhesion to the absorbent layer, effectively trapping liquid absorbed by the absorbent layer and further reducing fluff pulp fiber shedding from the inner layer. The fiber diameters of the first absorbent outer layer 3 and the second absorbent outer layer 5 range from 2.2 to 4.5 μm.

[0093] In this embodiment, the absorbent layer 4 is made of natural fluff pulp fibers. The high-weight absorbent layer 4 in this embodiment greatly increases the thickness of the composite multi-layer nonwoven fabric product provided by this embodiment.

[0094] The preparation method of the composite multi-layer nonwoven fabric provided in this embodiment is the same as that in Example 1. In this embodiment, the total mass of the hydrophilic additives in the first surface layer and the second surface layer accounts for 0.5% of the total mass of the composite multi-layer nonwoven fabric.

[0095] Example 3: refer to Figure 2 As shown in the structure, this embodiment provides a composite multi-layer non-woven fabric. The structure of the composite multi-layer non-woven fabric provided in this embodiment is, from top to bottom, a first surface layer 1, a first wood pulp fiber layer 2, a first absorbent outer layer 3, a second absorbent outer layer 5, a second wood pulp fiber layer 6, and a second surface layer 7.

[0096] In this embodiment, the first surface layer 1 has a weight of 4 gsm. The first wood pulp fiber layer 2 has a weight of 35 gsm. The first absorbent outer layer 3 has a weight of 10 gsm. The second absorbent outer layer 5 has a weight of 10 gsm. The second wood pulp fiber layer 6 has a weight of 35 gsm. The second surface layer 7 has a weight of 4 gsm. The total weight of the composite multi-layer nonwoven fabric provided in this embodiment is 98 gsm.

[0097] In this embodiment, the first and second surface layers 1 and 7 are meltblown fiber webs comprising meltblown fibers and a hydrophilic additive. The meltblown fibers of the first and second surface layers 1 and 7 are meltblown by mixing polypropylene particles, polylactic acid, a degradable masterbatch, stain-removing particles, and a softening masterbatch in a mass ratio of 50:31:2:15:2. The fiber diameters of the first and second surface layers 1 and 7 range from 1.2 to 3.5 μm. The stain-removing particles are composed of decyl glucoside, fatty alcohol polyoxyethylene ether, and propylene glycol in a mass ratio of 1:1:1.2.

[0098] In this embodiment, the first wood pulp fiber layer 2 and the second wood pulp fiber layer 6 are made of natural fluff pulp fibers. In this embodiment, the weight ratio of the first wood pulp fiber layer 2 and the second wood pulp fiber layer 6 is increased, and the absorbent layer is replaced by two high-weight wood pulp fiber layers.

[0099] In this embodiment, the first and second absorbent outer layers 3 and 5 are meltblown fiber webs formed by meltblowing polypropylene particles, polylactic acid, a degradable masterbatch, a hydrophilic masterbatch, a tackifying masterbatch, and oil-absorbing resin particles in a mass ratio of 50:33:2:5:5:5. The fibers produced by meltblowing the polypropylene particles and the tackifying masterbatch have high strength and better adhesion to the first and second wood pulp fiber layers 2 and 6. This allows for better all-around confinement of liquid absorbed by the first and second absorbent outer layers 3 and 5, while further reducing fluff pulp fiber shedding from the first and second absorbent outer layers 3 and 5. The fiber diameters of the first and second absorbent outer layers 3 and 5 range from 2.2 to 4.5 μm.

[0100] The preparation method of the composite multi-layer nonwoven fabric provided in this embodiment is substantially the same as that of Example 1, except that the preparation of the absorbent layer is omitted, and the spray rate is 170 L / H. In this embodiment, the total mass of the hydrophilic additive in the first and second surface layers accounts for 0.5% of the total mass of the composite multi-layer nonwoven fabric.

[0101] Test example: (1) Absorption test-absorption time Test Method: Spread the sample on a tabletop. Use a rubber-tipped dropper to drop a drop approximately 1 cm from the fabric surface. Start timing and stop when the droplet is absorbed and the specular reflection disappears. The results are shown in Table 1.

[0102] Table 1 Absorption test results

[0103] (2) Comparison of liquid absorption rate Test method: Soak the sample in pure water for 60 seconds, hang it to drain for 90 seconds, and calculate the liquid absorption capacity (LAC) of each test sample (or combined test sample) according to formula (1); Formula (1); In formula (1): m n is the mass of the test sample after liquid absorption, in grams (g); m k is the mass of the test sample after humidity adjustment, in grams (g); The average value of liquid absorption and its standard deviation of the five test samples were calculated. The test results are shown in Table 2.

[0104] Table 2 Comparison of liquid absorption rate

[0105] (3) Oil adsorption test Add 70 g of peanut oil to a 1000 mL beaker. Gently place a 2 g nonwoven fabric sample on the surface of the oil. After standing for 15 minutes, remove the nonwoven fabric sample and let it stand for 5 minutes. Then, weigh the nonwoven fabric sample. The oil absorption capacity of the nonwoven fabric can be calculated using formula (2): Formula (2); In formula (2), q represents the material's oil absorption capacity, expressed in g oil / g oil-absorbing material, i.e., the mass of oil absorbed per gram of material; St represents the total weight of the sample after oil absorption, expressed in g; and So represents the original mass of the oil-absorbing material, expressed in g. The test results are shown in Table 3.

[0106] Table 3 Oil adsorption test results

[0107] From the above examples, it can be seen that the composite multi-layer nonwoven fabric provided by the present invention has strong water and oil absorption capacity and cleaning ability and is biodegradable.

[0108] This invention overcomes the drawbacks of traditional paper towels, which absorb water but not oil, and have poor water and oil absorption, by combining a hydrophilic agent (hydrophilic additive and hydrophilic masterbatch) with oil-absorbing resin particles. After oil absorption, the paper towel does not leak under external pressure and exhibits excellent thermal stability. Decontamination particles are added to the first and second surface layers to emulsify oil-water mixtures that are difficult to absorb on the surface, enhancing the product's cleansing properties. The addition of a softening masterbatch significantly improves the product's softness, imparting a soft, dry feel to the surface. Compared to other cellulosic materials, the first and second wood pulp fiber layers utilize natural fluff pulp, which has long, coarse fibers, high fiber strength, and excellent softness. Furthermore, the absorbent layer, composed of natural wood pulp fibers, is compact, soft, and thick, low-cost, recyclable, and exhibits excellent water and oil absorption properties.

[0109] Although the above embodiment provides a detailed description of the present invention, it is only a part of the embodiments of the present invention, not all of the embodiments. Other embodiments can be obtained based on this embodiment without creativity, and these embodiments all fall within the scope of protection of the present invention.

Claims

1. A composite multi-layer nonwoven fabric, characterized in that, The first surface layer, the first wood pulp fiber layer, the first absorbent outer layer, the second absorbent outer layer, the second wood pulp fiber layer, and the second surface layer are sequentially stacked from top to bottom; The first surface layer or the second surface layer is a meltblown fiber web, the meltblown fiber web comprises first meltblown fibers and a functional additive, the raw materials for preparing the first meltblown fibers comprise a first thermoplastic polymer, a first degradable masterbatch and stain removal particles, and the functional additive comprises a hydrophilic additive; The first absorbent outer layer or the second absorbent outer layer comprises a second meltblown fiber, and the raw materials for preparing the second meltblown fiber comprise a second thermoplastic polymer, a functional masterbatch and oil-absorbing resin particles, and the functional masterbatch comprises a second degradable masterbatch and a hydrophilic masterbatch.

2. The composite multi-layer nonwoven fabric according to claim 1, characterized in that The stain removal particles include decyl glucoside, fatty alcohol polyoxyethylene ether and propylene glycol; the mass ratio of decyl glucoside, fatty alcohol polyoxyethylene ether and propylene glycol is 1:1:(1-1.5).

3. The composite multi-layer nonwoven fabric according to claim 1 or 2, characterized in that: The first thermoplastic polymer is a fully degradable thermoplastic polymer; The mass ratio of the first thermoplastic polymer to the first degradable masterbatch is (80-90): (1-3); The mass ratio of the first thermoplastic polymer to the stain removal particles is (80-90):(10-20); The total gram weight of the first surface layer and the second surface layer accounts for 5-25% of the gram weight of the composite multi-layer non-woven fabric.

4. The composite multi-layer nonwoven fabric according to claim 1, characterized in that The raw materials for preparing the first melt-blown fiber also include a soft masterbatch; the mass ratio of the first thermoplastic polymer to the soft masterbatch is (80~90): (1~3).

5. The composite multi-layer nonwoven fabric according to claim 1, characterized in that: The functional additives further include antibacterial additives and / or softening additives. The total mass of the functional additives in the first surface layer and the second surface layer accounts for 0.1-1.2% of the total mass of the composite multi-layer nonwoven fabric.

6. The composite multi-layer nonwoven fabric according to claim 1, characterized in that: The second thermoplastic polymer is a completely degradable thermoplastic polymer; the functional masterbatch further comprises a tackifying masterbatch; the oil-absorbing resin particles comprise polyacrylate oil-absorbing resin particles; The mass ratio of the second thermoplastic polymer to the second degradable masterbatch is (80-90): (1-3); The mass ratio of the second thermoplastic polymer to the hydrophilic masterbatch is (80-90): (5-10); The mass ratio of the second thermoplastic polymer to the tackifying masterbatch is (80-90): (5-10); The mass ratio of the second thermoplastic polymer to the oil absorbing resin particles is (80-90): (5-10); The percentage of the gram weight of the first absorbent outer layer or the gram weight of the second absorbent outer layer to the total gram weight of the composite multi-layer non-woven fabric is 4-12%.

7. The composite multi-layer nonwoven fabric according to claim 1, characterized in that: The composite multi-layer non-woven fabric also includes an absorbent layer, which is arranged between the first absorbent outer layer and the second absorbent outer layer; the absorbent layer includes natural wood pulp fibers, and the gram weight of the absorbent layer accounts for 35~45% of the total gram weight of the composite multi-layer non-woven fabric.

8. The composite multi-layer nonwoven fabric according to claim 1, characterized in that: The first wood pulp fiber layer or the second wood pulp fiber layer comprises natural fluff pulp fibers; The percentage of the gram weight of the first wood pulp fiber layer or the gram weight of the second wood pulp fiber layer to the total gram weight of the composite multi-layer non-woven fabric is 10-42%.

9. The method for preparing the composite multi-layer nonwoven fabric according to any one of claims 1 to 8, characterized in that: The following steps are involved: (1) preparing an initial second surface layer by a melt-blowing method, and then spraying and drying the initial second surface layer in sequence to obtain a second surface layer, wherein the spraying treatment uses a spray liquid, and the spray liquid includes a functional additive and water; (2) preparing a second wood pulp fiber layer on the upper surface of the second surface layer; (3) preparing a second absorbent outer layer on the upper surface of the second wood pulp fiber layer by melt-blowing; (4) preparing a first absorbent outer layer on the upper surface of the second absorbent outer layer by meltblowing; (5) preparing a first wood pulp fiber layer on the upper surface of the first absorbent outer layer; (6) preparing an initial first surface layer on the upper surface of the first wood pulp fiber layer by a melt-blowing method, and then spraying and drying the initial first surface layer in sequence to obtain a first surface layer, wherein the spraying treatment uses a spray liquid, and the spray liquid includes a functional additive and water; A multilayer structure product is obtained; (7) Hot rolling the multi-layer structure product to obtain the composite multi-layer nonwoven fabric.

10. The preparation method according to claim 9, characterized in that In step (1) or step (6), the mass percentage of the functional additive in the spray liquid is 0.5-6%; the spraying volume of the spray liquid is 80-200 L / h; In step (1) or step (6), the drying is hot air drying, and the conditions of the hot air drying include: the hot air temperature is 200~260℃, and the hot air volume is 2000~5500m³ / h.

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