Composite multilayer nonwoven fabric and method for manufacturing the same

Abstract

The present application 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 provided by the present application comprises, from top to bottom, 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. The composite multi-layer non-woven fabric provided by the present application has higher oil absorption and water absorption performance, and has the ability to retain water and oil after absorption, thereby overcoming the shortcomings of traditional non-woven fabrics that are not easy to absorb water and oil. The composite multi-layer non-woven fabric provided by the present application can be used not only for kitchen cleaning, but also for industrial wiping, and can be used not only for the production of wet wipes, but also for the production of dry wipes.

Description

TECHNICAL FIELD

[0001] The present application 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. BACKGROUND

[0002] With the development of non-woven fabric technology and the improvement of people's living standards, people's performance requirements for non-woven fabrics for cleaning are also improving. As a daily necessity, non-woven fabrics have the characteristics of short process flow, high production efficiency, high yield, low cost, wide application, and multiple sources of raw materials.

[0003] At present, the traditional non-woven fabric raw material is mainly polypropylene, which has the disadvantages of non-degradability and poor water and oil absorption, and thus is not favored by people. SUMMARY

[0004] The present application provides a composite multi-layer non-woven fabric and a preparation method thereof. The composite multi-layer non-woven fabric provided by the present application has the characteristics of degradability and higher oil and water absorption performance, and has a unique retention ability after absorbing water and oil, thereby overcoming the shortcomings of traditional non-woven fabrics that are not easy to absorb water and oil. The composite multi-layer non-woven fabric provided by the present application can not only be used for kitchen cleaning, but also can be used for industrial wiping, and can be used for making wet wipes and dry wipes.

[0005] In order to achieve the above-mentioned purpose, the present application provides the following technical scheme:

[0006] The present application provides a composite multi-layer non-woven fabric, which 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 arranged in sequence from top to bottom.

[0007] The first surface layer or the second surface layer is a melt-blown fiber web, which comprises first melt-blown fibers and a functional additive. The preparation raw material of the first melt-blown fibers comprises a first thermoplastic polymer, a first degradable master batch, and a stain removal particle. The functional additive comprises a hydrophilic additive.

[0008] The first absorption outer layer or the second absorption outer layer comprises second melt-blown fibers, and the preparation raw material of the second melt-blown fibers comprises a second thermoplastic polymer, a functional master batch, and oil absorption resin particles. The functional master batch comprises a second degradable master batch and a hydrophilic master batch.

[0009] Preferably, the stain removal particle comprises decyl glucoside, fatty alcohol polyoxyethylene ether, and propylene glycol, and the mass ratio of the decyl glucoside, the fatty alcohol polyoxyethylene ether, and the propylene glycol is 1:1:(1-1.5).

[0010] Preferably, the first thermoplastic polymer is a completely degradable thermoplastic polymer.

[0011] The mass ratio of the first thermoplastic polymer and the first degradable master batch is (80-90):(1-3);

[0012] The mass ratio of the first thermoplastic polymer and the stain-removing particles is (80-90):(10-20);

[0013] The total gram weight of the first surface layer and the second surface layer accounts for 5-25% of the total gram weight of the composite multi-layer nonwoven fabric.

[0014] Preferably, the raw material for preparing the first melt-blown fiber further comprises a soft master batch; the mass ratio of the first thermoplastic polymer and the soft master batch is (80-90):(1-3).

[0015] Preferably, the functional auxiliary agent further comprises an antibacterial auxiliary agent and / or a softening auxiliary agent; the total mass of the functional auxiliary agent 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.

[0016] Preferably, the second thermoplastic polymer is a completely degradable thermoplastic polymer; the functional master batch further comprises a tackifying master batch; the oil-absorbing resin particles comprise polyacrylate oil-absorbing resin particles;

[0017] The mass ratio of the second thermoplastic polymer and the second degradable master batch is (80-90):(1-3);

[0018] The mass ratio of the second thermoplastic polymer and the hydrophilic master batch is (80-90):(5-10);

[0019] The mass ratio of the second thermoplastic polymer and the tackifying master batch is (80-90):(5-10);

[0020] The mass ratio of the second thermoplastic polymer and the oil-absorbing resin particles is (80-90):(5-10);

[0021] The gram weight of the first absorbent outer layer or the second absorbent outer layer accounts for 4-12% of the total gram weight of the composite multi-layer nonwoven fabric.

[0022] Preferably, the composite multi-layer nonwoven fabric further comprises an absorbent layer, which is arranged between the first absorbent outer layer and the second absorbent outer layer; the absorbent layer comprises 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 nonwoven fabric.

[0023] Preferably, the first wood pulp fiber layer or the second wood pulp fiber layer comprises natural fluff pulp fibers;

[0024] The percentage of the gram weight of the first wood pulp fiber layer or the second wood pulp fiber layer in the total gram weight of the composite multi-layer non-woven fabric is 10-42%.

[0025] The application provides a preparation method of the composite multi-layer non-woven fabric.

[0026] (1) An initial second surface layer is prepared by using a melt-blowing method, and then the initial second surface layer is sequentially subjected to spraying treatment and drying to obtain a second surface layer, wherein the spraying treatment uses a spraying liquid, and the spraying liquid comprises a functional additive and water.

[0027] (2) A second wood pulp fiber layer is prepared on the upper surface of the second surface layer.

[0028] (3) A second absorption outer layer is prepared on the upper surface of the second wood pulp fiber layer by using a melt-blowing method.

[0029] (4) A first absorption outer layer is prepared on the upper surface of the second absorption outer layer by using a melt-blowing method.

[0030] (5) A first wood pulp fiber layer is prepared on the upper surface of the first absorption outer layer.

[0031] (6) An initial first surface layer is prepared on the upper surface of the first wood pulp fiber layer by using a melt-blowing method, and then the initial first surface layer is sequentially subjected to spraying treatment and drying to obtain a first surface layer, wherein the spraying treatment uses a spraying liquid, and the spraying liquid comprises a functional additive and water; and a multi-layer structure product is obtained.

[0032] (7) The multi-layer structure product is subjected to hot rolling to obtain the composite multi-layer non-woven fabric.

[0033] Preferably, in step (1) or step (6), the mass percentage content of the functional additive in the spraying liquid is 0.5-6%, and the spraying amount of the spraying liquid is 80-200 L / H.

[0034] In step (1) or step (6), the drying is hot air drying, and the conditions of the hot air drying include that the hot air temperature is 200-260 ℃, and the hot air flow rate is 2000-5500 m³ / h.

[0035] The application provides a composite multi-layer non-woven fabric, comprising 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 first surface layer or the second surface layer is a melt-blown fiber web, the melt-blown fiber web comprises first melt-blown fibers and a functional additive, the raw material of the first melt-blown fibers comprises a first thermoplastic polymer, a first degradable master batch and stain removal particles, and the functional additive comprises a hydrophilic additive; the first absorption outer layer or the second absorption outer layer comprises second melt-blown fibers, the raw material of the second melt-blown fibers comprises a second thermoplastic polymer, a functional master batch and oil absorption resin particles, and the functional master batch comprises a second degradable master batch and a hydrophilic master batch. The application adds stain removal particles and a hydrophilic additive in the first surface layer and the second surface layer, the stain removal particles can emulsify the oil-water mixture which 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 number of chippings in the wiping process; through the cooperation of the stain removal particles and the hydrophilic additive, the two surface layers of the composite multi-layer non-woven fabric have higher oil absorption and water absorption performance; the application sets the wood pulp fiber layer (the first wood pulp fiber layer and the second wood pulp fiber layer) between the surface layer (the first surface layer and the second surface layer) and the absorption outer layer (the first absorption outer layer and the second absorption outer layer), the wood pulp fiber layer not only serves as a bridge connecting the surface layer and the absorption outer layer, but also further promotes the oil absorption and water absorption performance of the composite multi-layer non-woven fabric by virtue of the high porosity of the wood pulp fiber layer; the application adds oil absorption resin particles and a hydrophilic master batch in the first absorption outer layer and the second absorption outer layer, the hydrophilic master batch can further enhance the water absorption and diffusion capacity from the surface layer to the inner layer, and the oil absorption resin particles realize the oil absorption purpose through the Van der Waals force generated between the lipophilic groups and oil molecules, the oil absorption mechanism is the solvation process of the high molecular chain segment, when the oil absorption resin contacts the oil film, the molecular diffusion control is in the initial stage; after a certain amount of oil is absorbed, the oil molecules and the high molecular chain segment form a stable physical combination, and the oil absorption resin particles have the characteristics of multiple oil absorption types, large oil absorption capacity and strong oil retention capacity. In addition, the composite multi-layer non-woven fabric provided by the application contains the first degradable master batch and the second degradable master batch, and the obtained composite multi-layer non-woven fabric has the degradable characteristic. In summary, the composite multi-layer non-woven fabric provided by the application has the degradable characteristic, higher oil absorption and water absorption performance, and the unique retention capacity after water absorption and oil absorption, thereby overcoming the shortcomings of the traditional non-woven fabric that is not easy to absorb water and oil. The composite multi-layer non-woven fabric provided by the application can be used not only for kitchen life, but also for industrial wiping, and can be used for the production of wet wipes and dry wipes.

[0036] Further, in the present application, the functional master batch further comprises a tackifying master batch. The present application further adds a tackifying master batch in the first and second absorbent outer layers. The tackifying master batch added in the absorbent outer layer strengthens the bonding capacity between the absorbent outer layer and the wood pulp fiber layer, firmly bonds the absorbent outer layer and the wood pulp fiber layer, does not affect the absorption performance between the layers, reduces the loose or uneven condition of the inner layer fiber in the melt-blown process of the absorbent outer layer, further reduces the uneven absorption caused by the fiber displacement of the wood pulp fiber layer due to the friction deformation in the wiping process, and further reduces the generation of debris in the wiping process.

[0037] Further, in the present application, the composite multi-layer non-woven fabric further comprises an absorbent layer, which is arranged between the first and second absorbent outer layers; the absorbent layer comprises natural wood pulp fiber. When the composite multi-layer non-woven fabric provided by the present application further comprises an absorbent layer, the absorbent outer layer serves as a bridge connecting the wood pulp fiber layer and the absorbent layer, and the oil and water removed by the absorbent outer layer are more fully introduced into the absorbent layer, thereby effectively increasing the oil and water absorption capacity of the composite multi-layer non-woven fabric and improving the oil and water absorption efficiency of the composite multi-layer non-woven fabric. At the same time, by arranging the absorbent layer, the overall thickness of the product can be made larger, the thickness of the product can be increased, and the use experience of consumers can be improved.

[0038] Further, in the present application, the preparation raw material of the first melt-blown fiber further comprises a soft master batch. By adding a soft master batch in the melt-blown fiber web of the two surface layers, the softness of the product can be significantly improved, and the product surface can be endowed with soft and dry hand feeling. BRIEF DESCRIPTION OF DRAWINGS

[0039] Figure 1 The cross-sectional layer distribution schematic diagram of the composite multi-layer non-woven fabric provided by the embodiments 1-2 of the present application is shown in the figure;

[0040] Figure 2 The cross-sectional layer distribution schematic diagram of the composite multi-layer non-woven fabric provided by the embodiment 3 of the present application is shown in the figure;

[0041] Figure 3 The enlarged cross-sectional schematic diagram of the outer three layers of the composite multi-layer non-woven fabric provided by the embodiments 1-3 of the present application is shown in the figure;

[0042] Figure 4 The structure schematic diagram of the spraying system and the hot air drying system provided by the present application is shown in the figure;

[0043] Figure 5 The structure schematic diagram of the absorbent layer and the absorbent outer layer provided by the present application is shown in the figure;

[0044] In the figure: 1 is a first surface layer; 2 is a first wood pulp fiber layer; 3 is a first absorption outer layer; 4 is an absorption layer; 5 is a second absorption outer layer; 6 is a second wood pulp fiber layer; 7 is a second surface layer; 8 is an oil-absorbing resin particle; 9 is an oil-absorbing resin polymer group; 10 is a netting curtain; 11 is a first shower head; 12 is a second shower head; 13 is a hot air hole; 14 is a hot air drying system; 15 is a natural wood pulp fiber; and 16 is hot air. DETAILED DESCRIPTION

[0045] The present application provides a composite multi-layer non-woven fabric, comprising 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.

[0046] The first surface layer or the second surface layer is a melt-blown fiber net, which comprises first melt-blown fibers and a functional additive, the raw material of the first melt-blown fibers comprises a first thermoplastic polymer, a first degradable master batch, and a stain-removing particle, and the functional additive comprises a hydrophilic additive.

[0047] The first absorption outer layer or the second absorption outer layer comprises second melt-blown fibers, the raw material of the second melt-blown fibers comprises a second thermoplastic polymer, a functional master batch, and an oil-absorbing resin particle, and the functional master batch comprises a second degradable master batch and a hydrophilic master batch.

[0048] In the present application, all the raw materials / components are commercially available products which are well known to those skilled in the art, unless otherwise specified.

[0049] The composite multi-layer non-woven fabric provided by the present application comprises a first surface layer. In the present application, the first surface layer comprises first melt-blown fibers and a functional additive. The raw material of the first melt-blown fibers comprises a first thermoplastic polymer, a first degradable master batch, and a stain-removing particle. The functional additive comprises a hydrophilic additive. The first thermoplastic polymer is preferably a completely degradable thermoplastic polymer. The completely degradable thermoplastic polymer preferably comprises one or more of polypropylene, polylactic acid (PLA), and polybutylene succinate (PBS); in the embodiments, it can be polypropylene and polylactic acid. The first degradable master batch is preferably a master batch of the completely degradable first thermoplastic polymer. When the completely degradable thermoplastic polymer is any two of the above-mentioned substances, the mass ratio of the above-mentioned any two substances is preferably 50:33.

[0050] In the present application, the mass ratio of the first thermoplastic polymer and the first degradable master batch is preferably (80-90):(1-3), and in the embodiments, it can be 83:2 or 81:2.

[0051] In the present application, the stain-removing particles preferably comprise decyl glucoside (APG), fatty alcohol polyoxyethylene ether and propylene glycol; the mass ratio of the decyl glucoside, the fatty alcohol polyoxyethylene ether and the propylene glycol is preferably 1:1:(1~1.5), and in the embodiments, it can be 1:1:1.2. The mass ratio of the first thermoplastic polymer and the stain-removing particles is preferably (80~90):(10~20), and in the embodiments, it can be 83:15 or 81:15.

[0052] In the present application, the stain-removing particles play a role in quickly disintegrating the stains on the contact surface, effectively promoting the maximum absorption of the stains, and further reducing the amount of chipping during wiping.

[0053] In the present application, the raw material for preparing the first melt-blown fiber preferably further comprises a soft master batch. The mass ratio of the first thermoplastic polymer and the soft master batch is preferably (80~90):(1~3), and in the embodiments, it can be 81:2. In the present application, the addition of the soft master batch in a low amount can significantly improve the softness of the product, giving the product a soft and dry touch on the surface.

[0054] In the present application, the diameter of the first melt-blown fiber is preferably 1.2~8.5μm.

[0055] In the present application, the functional auxiliary agent comprises a hydrophilic auxiliary agent. The hydrophilic auxiliary agent can effectively reduce the surface tension of water molecules when the first surface layer contacts the water molecules, accelerate the diffusion of water molecules on the surface of the first surface layer, effectively improve the water absorption performance of the chemical fibers in the first surface layer, and quickly penetrate into the first wood pulp fiber layer, so that the water absorption characteristics of the first wood pulp fiber layer are maximized. The functional auxiliary agent preferably further comprises an antibacterial auxiliary agent and / or a softening auxiliary agent. When the functional auxiliary agent is two or three, the present application does not have special requirements for the mass ratio of the two or three functional auxiliary agents.

[0056] In the present application, the percentage of the mass of the functional auxiliary agent in the first surface layer in the total mass of the composite multi-layer non-woven fabric is preferably equal to the percentage of the mass of the functional auxiliary agent in the second surface layer in the total mass of the composite multi-layer non-woven fabric.

[0057] In the present application, the total mass of the functional auxiliary agent 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 non-woven fabric, and in the embodiments, it can be 0.5%.

[0058] In the present application, the first surface layer is preferably a fiber web formed by the first melt-blown fiber, and the fiber web formed by the first melt-blown fiber is distributed with the functional auxiliary agent.

[0059] In the present application, 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 the examples, it can be 8 gsm, 5 gsm or 4 gsm.

[0060] In the present application, the gram weight of the first surface layer and the second surface layer is the same.

[0061] In the present application, the total gram weight of the first surface layer and the second surface layer accounts for 5-25% of the total gram weight of the composite multi-layer non-woven fabric, more preferably 8-12%, and in the examples, it can be 16.7%, 10.2% or 8.2%.

[0062] The present application increases the gram weight ratio of the first surface layer and the second surface layer in the composite multi-layer non-woven fabric, enhances the friction resistance during wiping, strengthens the ability to remove stubborn stains, effectively reduces the problem of surface layer damage during wiping, and at the same time, the first surface layer and the second surface layer are arranged on the outermost layer, which plays a role in coating and protecting the inner structure layer, preventing liquid from seeping out after absorbing water and oil.

[0063] The composite multi-layer non-woven fabric provided by the present application comprises a first wood pulp fiber layer arranged on the lower surface of the first surface layer. In the present application, the first wood pulp fiber layer preferably comprises natural fluff pulp fibers.

[0064] In the present application, the gram weight of the first wood pulp fiber layer is preferably 10-40 gsm, and in the examples, it can be 10 gsm, 20 gsm or 35 gsm.

[0065] In the present application, the gram weight of the first wood pulp fiber layer is equal to the gram weight of the second wood pulp fiber layer.

[0066] In the present application, the gram weight of the first wood pulp fiber layer or the gram weight of the second wood pulp fiber layer accounts for 10-42% of the total gram weight of the composite multi-layer non-woven fabric, more preferably 10-36%, and in the examples, it can be 10.4%, 20.4% or 35.7%.

[0067] In the present application, the first wood pulp fiber layer is fixedly connected between the first surface layer and the first absorbent outer layer, which improves the overall softness of the composite multi-layer non-woven fabric, makes the overall composite multi-layer non-woven fabric more fluffy, and has a larger thickness under the same total gram weight. At the same time, the first wood pulp fiber layer has good water absorption and oil absorption properties, reducing the absorption time between the first surface layer and the first absorbent outer layer.

[0068] The composite multi-layer nonwoven fabric provided by the present application comprises a first absorption outer layer arranged on the lower surface of the first wood pulp fiber layer. In the present application, the first absorption outer layer comprises second melt-blown fibers. The raw material of the second melt-blown fibers comprises a second thermoplastic polymer, a functional master batch and oil-absorbing resin particles. The functional master batch comprises a second degradable master batch and a hydrophilic master batch. In the present application, the second thermoplastic polymer is preferably a completely degradable thermoplastic polymer. The completely degradable thermoplastic polymer preferably comprises one or more of polypropylene (PP), polylactic acid (PLA) and polybutylene succinate (PBS), and in the embodiments, can be polypropylene and polylactic acid. When the completely degradable thermoplastic polymer is any two of the above-mentioned substances, the mass ratio of the any two substances is preferably 50:33.

[0069] In the present application, the functional master batch comprises a second degradable master batch and a hydrophilic master batch, and the second degradable master batch is preferably a master batch of a completely degradable second thermoplastic polymer.

[0070] In the present application, the mass ratio of the second thermoplastic polymer and the second degradable master batch is preferably (80-90):(1-3), and in the embodiments, can be 83:2.

[0071] In the present application, the hydrophilic master batch can further enhance the water absorption and diffusion capacity between the first surface layer and the first absorption outer layer. In the present application, the mass ratio of the second thermoplastic polymer and the hydrophilic master batch is preferably (80-90):(5-10), and in the embodiments, can be 83:5.

[0072] In the present application, the functional master batch preferably further comprises a tackifying master batch. The tackifying master batch further enhances the bonding capacity between the first wood pulp fiber layer, the first absorption outer layer and the absorption layer, so that they are firmly bonded, and does not affect the absorption performance between the layers, reduces the loose or uneven condition of the inner layer fibers during the melt-blown process when the first absorption outer layer is prepared, further reduces the uneven absorption caused by the displacement of the wood pulp fibers in the first absorption outer layer during the rubbing process due to the friction deformation, and further reduces the generation of chippings during the rubbing process. In the present application, the mass ratio of the second thermoplastic polymer and the tackifying master batch is preferably (80-90):(5-10), and in the embodiments, can be 83:5.

[0073] In the present application, the oil-absorbing resin particles preferably include polyacrylate oil-absorbing resin particles, and more preferably polyacrylate high oil-absorbing resin particles with low three-dimensional network chemical cross-linking structure. The oil-absorbing resin particles achieve the purpose of oil absorption through the Van der Waals force generated between lipophilic groups and oil molecules, and the oil absorption mechanism is the solvation process of polymer chain segments. When the oil-absorbing resin particles contact the oil film, the initial stage is molecular diffusion control; after absorbing a certain amount of oil, stable physical combination is formed between the oil molecules and the polymer chain segments, and the oil-absorbing resin particles have the characteristics of multiple oil-absorbing types, large oil-absorbing amount, and strong oil-retaining capacity. In the present application, the mass ratio of the second thermoplastic polymer to the oil-absorbing resin particles is preferably (80-90):(5-10), and in the examples, it can be 83:10 or 83:5.

[0074] In the present application, the mass of the second melt-blown fiber is preferably 1.2-8.5 μm.

[0075] In the present application, the first absorbing outer layer is preferably a fiber web formed by the second melt-blown fiber. The grammage of the first absorbing outer layer is preferably 1.5-10.5 gsm, and in the examples, it can be 10 gsm or 4 gsm.

[0076] In the present application, the grammage of the first absorbing outer layer is preferably equal to the grammage of the second absorbing outer layer.

[0077] In the present application, the percentage of the grammage of the first absorbing outer layer or the grammage of the second absorbing outer layer in the total grammage of the composite multi-layer non-woven fabric is preferably 4-12%, and in the examples, it can be 4.2% or 10.4%.

[0078] The composite multi-layer non-woven fabric provided by the present application preferably includes an absorbing layer arranged on the lower surface of the first absorbing outer layer. In the present application, the absorbing layer is preferably arranged between the first absorbing outer layer and the second absorbing outer layer. The absorbing layer preferably includes natural wood pulp fibers.

[0079] In the present application, the grammage of the absorbing layer is preferably 30-100 gsm, and more preferably 35-45 gsm, and in the examples, it is 40 gsm.

[0080] In the present application, the percentage of the grammage of the absorbing layer in the total grammage of the composite multi-layer non-woven fabric is preferably 35-45%, and in the examples, it can be 41.7% or 40.8%.

[0081] The composite multi-layer non-woven fabric provided by the present application includes a second absorbing outer layer arranged on the lower surface of the first absorbing outer layer or the absorbing layer. In the present application, the preferred range of the second absorbing outer layer is the same as the preferred range of the first absorbing outer layer, which is not repeated here.

[0082] The composite multi-layer nonwoven fabric provided by the present application comprises a second wood pulp fiber layer arranged on the lower surface of the second absorbent outer layer. In the present application, 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.

[0083] The composite nonwoven fabric provided by the present application comprises a second surface layer arranged on the lower surface of the second wood pulp fiber layer. In the present application, the preferred range of the second surface layer is the same as that of the first surface layer, which will not be repeated here.

[0084] As one or more embodiments of the present application, the composite multi-layer nonwoven fabric comprises 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 arranged in order from top to bottom.

[0085] As one or more embodiments of the present application, the composite multi-layer nonwoven fabric comprises 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 arranged in order from top to bottom.

[0086] In the present application, the total basis weight of the composite multi-layer nonwoven fabric is preferably 30-221 gsm, more preferably 80-200 gsm, and further preferably 90-100 gsm, which can be 96 gsm or 98 gsm in the embodiments.

[0087] In the present application, the total mass content of thermoplastic polymers in the composite multi-layer nonwoven fabric is preferably 20-80%. The total mass content of wood pulp fibers in the composite multi-layer nonwoven fabric is preferably 20-80%. And the sum of the mass of the thermoplastic polymers and the wood pulp fibers is <100%.

[0088] The composite multi-layer nonwoven fabric provided by the present application preferably uses wood pulp fibers, adds stain removal particles, hydrophilic aids, oil-absorbing resin particles, and hydrophilic masterbatch, while also using soft masterbatch and tackifying masterbatch, which can have higher oil-absorbing and water-absorbing performance. The unique porosity of wood pulp fibers makes the product thicker, and has a unique retention capacity after absorbing water and oil. Compared with traditional nonwoven fabrics, the surface of the composite multi-layer nonwoven fabric provided by the present application is more velvety. The addition of biodegradable masterbatch and wood pulp fibers in the present application can make the product biodegradable, which can not only be used for kitchen and daily life, but also be used for industrial wiping, and can be used for making wet wipes and dry wipes, which is more in line with the current demand for green and light life.

[0089] The present application provides a preparation method of the composite multi-layer nonwoven fabric described in the above technical solution, which comprises the following steps:

[0090] (1) an initial second surface layer is prepared by melt-blowing, and then the initial second surface layer is sequentially subjected to spraying treatment and drying to obtain a second surface layer, wherein the spraying treatment uses a spraying liquid, and the spraying liquid comprises a functional additive and water;

[0091] (2) a second wood pulp fiber layer is prepared on the upper surface of the second surface layer;

[0092] (3) a second absorbent outer layer is prepared on the upper surface of the second wood pulp fiber layer by melt-blowing;

[0093] (4) a first absorbent outer layer is prepared on the upper surface of the second absorbent outer layer by melt-blowing;

[0094] (5) a first wood pulp fiber layer is prepared on the upper surface of the first absorbent outer layer;

[0095] (6) an initial first surface layer is prepared on the upper surface of the first wood pulp fiber layer by melt-blowing, and then the initial first surface layer is sequentially subjected to spraying treatment and drying to obtain a first surface layer, wherein the spraying treatment uses a spraying liquid, and the spraying liquid comprises a functional additive and water; a multi-layer structure product is obtained;

[0096] (7) the multi-layer structure product is subjected to hot rolling to obtain the composite multi-layer nonwoven fabric.

[0097] The present application adopts a melt-blown method to prepare an initial second surface layer, and then performs spraying treatment and drying on the initial second surface layer in sequence to obtain a second surface layer, wherein the spraying treatment uses a spraying liquid, and the spraying liquid comprises a functional additive and water. The present application does not have special requirements for the melt-blown method. In the present application, the spraying treatment preferably adopts online spraying treatment. The spraying treatment is preferably performed by using a spraying system, and the drying is preferably performed by using a hot air drying system. The hot air drying system is preferably located above the webbing curtain. The spraying system is preferably distributed upstream and downstream of the hot air drying system. The height of the spraying system from the webbing curtain is less than the height of the hot air drying system from the webbing curtain, and the vertical distance between the spraying system and the hot air drying system is 10-40 cm. The hot air blowing direction of the hot air drying system is vertically downward. The included angle between the blowing direction of the spraying system and the hot air blowing direction of the hot air drying system is preferably 80-150°. The water mist sprayed by the spraying system through a nozzle is preferably fan-shaped, so as to be uniformly sprayed into the initial second surface layer, to ensure the maximum area of the melt-blown web layer, to reduce the temperature after webbing, and to improve the strength performance of the melt-blown fiber. The mass percentage content of the functional additive in the spraying liquid is preferably 0.5-6%. The spraying amount of the spraying liquid is preferably 80-200 L / H. In the present application, the drying is preferably hot air drying, and the conditions of the hot air drying preferably include that the hot air temperature is preferably 200-260℃, and the hot air flow is preferably 2000-5500 m³ / h. By controlling the temperature and time of the hot air drying, the temperature uniformity and production efficiency are ensured, the residual moisture on the surface of the material can be effectively dried, the binding property between the layers of the composite multi-layer non-woven fabric is improved, and the mechanical property is improved.

[0098] After obtaining the second surface layer, the present application prepares a second wood pulp fiber layer on the upper surface of the second surface layer. The present application does not have special requirements for the preparation method of the second wood pulp fiber layer.

[0099] After obtaining the second wood pulp fiber layer, the present application prepares a second absorption outer layer on the upper surface of the second wood pulp fiber layer by using a melt-blown method. The present application does not have special requirements for the melt-blown method.

[0100] After obtaining the second absorption outer layer, the present application preferably prepares an absorption layer on the upper surface of the second absorption outer layer. The present application does not have special requirements for the preparation method of the absorption layer.

[0101] After obtaining the second absorption outer layer or the absorption layer, the present application prepares a first absorption outer layer on the upper surface of the second absorption outer layer or the absorption layer by using a melt-blown method. The present application does not have special requirements for the melt-blown method.

[0102] After obtaining the first absorbent outer layer, the present application prepares a first wood pulp fiber layer on the upper surface of the first absorbent outer layer. The present application has no special requirements for the preparation method of the first wood pulp fiber layer.

[0103] After obtaining the first wood pulp fiber layer, the present application uses a melt blowing method to prepare an initial first surface layer on the upper surface of the first wood pulp fiber layer, and then performs spraying treatment and drying on the initial first surface layer in sequence to obtain a first surface layer, wherein the spraying treatment uses a spraying liquid, and the spraying liquid comprises a functional additive and water; thereby obtaining a multi-layer structure product. The preparation method of the first surface layer is the same as that of the second surface layer, which will not be described here.

[0104] After obtaining the multi-layer structure product, the present application hot-rolls the multi-layer structure product to obtain the composite multi-layer nonwoven fabric. The present application has no special requirements for the specific implementation of the hot-rolling, and the conventional operation temperature and time known to those skilled in the art can be used.

[0105] In order to further illustrate the present application, the technical solutions provided by the present application will be described in detail below in combination with examples, but they should not be understood as limiting the scope of protection of the present application.

[0106] The polypropylene (PP) particles used in the following examples were purchased from Lyondellbasell. The hydrophilic additive was purchased from Lurui Fine Chemical Co., Ltd. The degradable masterbatch was purchased from Indoramaventures. The soft masterbatch was purchased from Jiangsu Plastek Hongmei Masterbatch Co., Ltd. The hydrophilic masterbatch was purchased from Changzhou Wang Yixin Material Technology Co., Ltd. The tackifying masterbatch was purchased from Changzhou Wang Yixin Material Technology Co., Ltd. The oil-absorbing resin particles were polyacrylic acid high oil-absorbing resin particles with low three-dimensional network chemical crosslinking structure, purchased from Changzhou Wang Yixin Material Technology Co., Ltd. The polylactic acid (PLA) was purchased from Changzhou Wang Yixin Material Technology Co., Ltd.

[0107] Example 1:

[0108] Reference Figure 1 As shown in the structure, the present embodiment provides a composite multi-layer nonwoven fabric, and the structure of the composite multi-layer nonwoven fabric provided by the present embodiment is sequentially 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.

[0109] In this embodiment: the first surface layer 1 has a grammage of 8 gsm. The first wood pulp fiber layer 2 has a grammage of 10 gsm. The first absorbent outer layer 3 has a grammage of 10 gsm. The absorbent layer 4 has a grammage of 40 gsm. The second absorbent outer layer 5 has a grammage of 10 gsm. The second wood pulp fiber layer 6 has a grammage of 10 gsm. The second surface layer 7 has a grammage of 8 gsm. The total grammage of the composite multi-layer non-woven fabric provided in this embodiment is 96 gsm.

[0110] In this embodiment: the first surface layer 1 and the second surface layer 7 are melt-blown fiber webs, which include melt-blown fibers and hydrophilic additives. The melt-blown fibers of the first surface layer 1 and the second surface layer 7 are formed by melt-blown polypropylene particles, polylactic acid, stain-removing particles, and degradable masterbatch at a mass ratio of 50:33:15:2. The fiber diameter of the first surface layer 1 and the second surface layer 7 ranges between 1.2 and 3.5 μm. The stain-removing particles are composed of decyl glucoside, fatty alcohol polyoxyethylene ether, and propylene glycol at a mass ratio of 1:1:1.2.

[0111] 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.

[0112] In this embodiment: the first absorbent outer layer 3 and the second absorbent outer layer 5 are melt-blown fiber webs, which are formed by melt-blown polypropylene particles, polylactic acid, degradable masterbatch, hydrophilic masterbatch, and oil-absorbing resin particles at a mass ratio of 50:33:2:5:10. The fiber diameter of the first absorbent outer layer 3 and the second absorbent outer layer 5 ranges between 2.2 and 4.5 μm.

[0113] In this embodiment: the absorbent layer 4 is composed of natural fluff pulp fibers. The high grammage of the absorbent layer 4 in this embodiment greatly improves the thickness of the composite multi-layer non-woven fabric product provided in this embodiment.

[0114] The method for preparing the composite multi-layer non-woven fabric provided in this embodiment specifically includes:

[0115] The initial second surface layer is prepared by melt-blown on the webbing curtain, and then the initial second surface layer is subjected to spraying treatment and drying in sequence to obtain the second surface layer. The spraying treatment is performed by using a spraying system, and the spraying treatment uses a spraying liquid. The spraying liquid includes hydrophilic additives and water. The mass content of the hydrophilic additives in the spraying liquid is 6%, and the spraying amount is 160 L / H. After the spraying of the hydrophilic additives, hot air drying is performed by using a hot air drying system. The hot air drying temperature is 230°C, and the hot air flow rate is 3000 m³ / h.

[0116] After the second surface layer is obtained, the second wood pulp fiber layer is prepared on the upper surface of the second surface layer.

[0117] 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.

[0118] After obtaining the second outer absorbent layer, the present invention prepares an absorbent layer on the upper surface of the second outer absorbent layer.

[0119] 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.

[0120] 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.

[0121] 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.

[0122] 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.

[0123] 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.

[0124] Example 2:

[0125] 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.

[0126] 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.

[0127] In the embodiment: the first surface layer 1 and the second surface layer 7 are melt-blown fiber webs, the melt-blown fiber webs comprise melt-blown fibers and hydrophilic aids, the melt-blown fibers of the first surface layer 1 and the second surface layer 7 are formed by melt-blown of polypropylene particles, polylactic acid, degradable masterbatch, stain-removing particles, soft masterbatch according to a mass ratio of 50:31:2:15:2, and the fiber diameter of the first surface layer 1 and the second surface layer 7 ranges between 1.2-3.5 μm. The stain-removing particles are composed of decyl glucoside, fatty alcohol polyoxyethylene ether and propylene glycol, and the mass ratio of decyl glucoside, fatty alcohol polyoxyethylene ether and propylene glycol is 1:1:1.2.

[0128] In the embodiment: the first wood pulp fiber layer 2 and the second wood pulp fiber layer 6 are composed of natural fluff pulp fibers.

[0129] In the embodiment: the first absorption outer layer 3 and the second absorption outer layer 5 are melt-blown fiber webs, the melt-blown fiber webs are formed by melt-blown of polypropylene particles, polylactic acid, degradable masterbatch, hydrophilic masterbatch, tackifying masterbatch and oil-absorbing resin particles according to a mass ratio of 50:33:2:5:5:5, and the polypropylene particles are composed of low-melt-index polypropylene particles. The fiber strength of the melt-blown fibers mixed with the tackifying masterbatch is high, the adhesion with the absorption layer is better, the liquid absorbed by the absorption layer can be better bound in all directions, and the fluff pulp fiber shedding of the inner layer is further reduced. The fiber diameter of the first absorption outer layer 3 and the second absorption outer layer 5 ranges between 2.2-4.5 μm.

[0130] In the embodiment: the absorption layer 4 is composed of natural fluff pulp fibers. In the embodiment, the high-grammage absorption layer 4 greatly improves the thickness of the composite multi-layer nonwoven fabric product provided by the embodiment.

[0131] The preparation method of the composite multi-layer nonwoven fabric provided by the embodiment is the same as that of embodiment 1. In the embodiment, the total mass of the hydrophilic aids 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.

[0132] Embodiment 3:

[0133] Reference Figure 2 As shown in the structure, the embodiment provides a composite multi-layer nonwoven fabric, and the structure of the composite multi-layer nonwoven fabric provided by the embodiment is sequentially the first surface layer 1, the first wood pulp fiber layer 2, the first absorption outer layer 3, the second absorption outer layer 5, the second wood pulp fiber layer 6 and the second surface layer 7 from top to bottom.

[0134] In this embodiment: the first surface layer 1 has a grammage of 4gsm. The first wood pulp fiber layer 2 has a grammage of 35gsm. The first absorbent outer layer 3 has a grammage of 10gsm. The second absorbent outer layer 5 has a grammage of 10gsm. The second wood pulp fiber layer 6 has a grammage of 35gsm. The second surface layer 7 has a grammage of 4gsm. The total grammage of the composite multi-layer nonwoven fabric provided in this embodiment is 98gsm.

[0135] In this embodiment: the first surface layer 1 and the second surface layer 7 are melt-blown fiber webs, which include melt-blown fibers and hydrophilic additives. The melt-blown fibers of the first surface layer 1 and the second surface layer 7 are formed by melt-blown polypropylene particles, polylactic acid, degradable masterbatch, stain-removing particles, and soft masterbatch at a mass ratio of 50:31:2:15:2. The fiber diameter of the first surface layer 1 and the second surface layer 7 ranges between 1.2-3.5μm. The stain-removing particles are composed of decyl glucoside, fatty alcohol polyoxyethylene ether, and propylene glycol at a mass ratio of 1:1:1.2.

[0136] 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. This embodiment increases the proportion of the grammage of the first wood pulp fiber layer 2 and the second wood pulp fiber layer 6, and replaces the absorbent layers with two high-grammage wood pulp fiber layers.

[0137] In this embodiment: the first absorbent outer layer 3 and the second absorbent outer layer 5 are melt-blown fiber webs, which are formed by mixing polypropylene particles, polylactic acid, degradable masterbatch, hydrophilic masterbatch, tackifying masterbatch, and oil-absorbing resin particles at a mass ratio of 50:33:2:5:5:5. The fiber strength of the polypropylene particles and the tackifying masterbatch is high, and the adhesion between the first wood pulp fiber layer 2 and the second wood pulp fiber layer 6 is better, which can better bind the liquid absorbed by the first absorbent outer layer 3 and the second absorbent outer layer 5 in all directions, and further reduces the fluff pulp fiber shedding of the first absorbent outer layer 3 and the second absorbent outer layer 5. The fiber diameter of the first absorbent outer layer 3 and the second absorbent outer layer 5 ranges between 2.2-4.5μm.

[0138] The preparation method of the composite multi-layer nonwoven fabric provided in this embodiment is basically the same as that of Embodiment 1, and the preparation of the absorbent layer is omitted. The spraying amount is 170L / H. 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.

[0139] Test Example:

[0140] (1) Absorbency Test - Absorption Time

[0141] Test method: The sample was laid on the table. A dropper was used to drop the sample at a distance of about 1 cm from the cloth. Timing was started and stopped when the mirror surface reflection disappeared. The results are shown in Table 1.

[0142] Table 1. Results of the absorption test

[0143]

[0144] (2) Comparison of liquid absorption ratio

[0145] Test method: The sample was placed in pure water for 60 seconds, and then hung for 90 seconds. The liquid absorption of each test sample (or combination test sample) was calculated according to formula (1);

[0146] Formula (1);

[0147] In formula (1), m n is the mass of the test sample after absorption, in grams (g); m k is the mass of the test sample after conditioning, in grams (g);

[0148] The average liquid absorption of 5 test samples and its standard deviation were calculated. The test results are shown in Table 2.

[0149] Table 2. Comparison of liquid absorption ratio results

[0150]

[0151] (3) Oil absorption test

[0152] In a 1000 mL beaker, 70 g of peanut oil was added. A nonwoven fabric sample with a mass of 2 g was gently placed on the surface of the oil. After 15 minutes, the nonwoven fabric sample was removed and left to stand for 5 minutes. Then, the nonwoven fabric sample was weighed. The oil absorption capacity of the nonwoven fabric could be calculated by formula (2):

[0153] Formula (2);

[0154] In formula (2), q represents the oil absorption capacity of the material, in g oil / g oil-absorbing material, i.e. the mass of oil that can be absorbed by each gram of material, St represents the total weight of the test sample after oil absorption, in g, and So represents the original mass of the oil-absorbing material, in g. The test results are shown in Table 3.

[0155] Table 3. Results of the oil absorption test

[0156]

[0157] The composite multi-layer non-woven fabric provided by the application has strong water absorption and oil absorption capacity, cleaning capacity and biodegradability.

[0158] The application solves the problems of traditional paper towel, such as poor water absorption and oil absorption, and oil leakage under external pressure after oil absorption, and good thermal stability by the combination of hydrophilic agent (hydrophilic auxiliary agent and hydrophilic master batch) and oil absorption resin particles. The application adds decontamination particles to the first surface layer and the second surface layer, the decontamination particles have emulsifying effect on the oil-water mixture difficult to be absorbed on the surface, which is beneficial to the cleaning effect of the product. The application adds soft master batch, which can significantly improve the softness of the product, and endows the product with soft and dry hand feeling.

[0159] Although the above embodiments have made a detailed description of the application, it is only a part of the embodiments of the application, not all the embodiments, and other embodiments can be obtained under the premise of no creativity according to the embodiments, which all belong to the protection scope of the application.

Claims

1. A composite multi-layer nonwoven fabric, characterized by, The first surface layer, the first wood pulp fiber layer, the first absorption outer layer, the second absorption outer layer, the second wood pulp fiber layer and the second surface layer are sequentially stacked from top to bottom. The first surface layer and the second surface layer are melt-blown fiber webs, the melt-blown fiber web comprises first melt-blown fibers and functional additives, the preparation raw materials of the first melt-blown fibers comprise a first thermoplastic polymer, a first degradable master batch and stain removal particles, the first thermoplastic polymer is a completely degradable thermoplastic polymer, the stain removal particles comprise decyl glucoside, fatty alcohol polyoxyethylene ether and propylene glycol, and the functional additives comprise hydrophilic additives. The first absorption outer layer and the second absorption outer layer comprise second melt-blown fibers, the preparation raw materials of the second melt-blown fibers comprise a second thermoplastic polymer, a functional master batch and oil-absorbing resin particles, the second thermoplastic polymer is a completely degradable thermoplastic polymer, the functional master batch comprises a second degradable master batch and a hydrophilic master batch, and the oil-absorbing resin particles comprise polyacrylate oil-absorbing resin particles.

2. The composite multi-layer nonwoven fabric according to claim 1, wherein The mass ratio of the decyl glucoside, the fatty alcohol polyoxyethylene ether and the 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 mass ratio of the first thermoplastic polymer and the first degradable master batch is (80-90):(1-3). The mass ratio of the first thermoplastic polymer and 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 total gram weight of the composite multi-layer non-woven fabric.

4. The composite multi-layer nonwoven fabric according to claim 1, wherein The preparation raw materials of the first melt-blown fibers further comprise a soft master batch, and the mass ratio of the first thermoplastic polymer and the soft master batch is (80-90):(1-3).

5. The composite multi-layer nonwoven fabric according to claim 1, wherein The functional additives further comprise antibacterial additives and / or softening additives, and 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 non-woven fabric.

6. The composite multi-layer nonwoven fabric according to claim 1, wherein The functional master batch further comprises a tackifying master batch. The mass ratio of the second thermoplastic polymer and the second degradable master batch is (80-90):(1-3). The mass ratio of the second thermoplastic polymer and the hydrophilic master batch is (80-90):(5-10). The mass ratio of the second thermoplastic polymer and the tackifying master batch is (80-90):(5-10). The mass ratio of the second thermoplastic polymer and the oil-absorbing resin particles is (80-90):(5-10). The gram weight of the first absorption outer layer or the second absorption outer layer accounts for 4-12% of the total gram weight of the composite multi-layer non-woven fabric.

7. The composite multi-layer nonwoven fabric according to claim 1, wherein The composite multi-layer non-woven fabric further comprises an absorption layer, the absorption layer is arranged between the first absorption outer layer and the second absorption outer layer, the absorption layer comprises 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.

8. The composite multi-layer nonwoven fabric according to claim 1, wherein The first wood pulp fiber layer or the second wood pulp fiber layer comprises natural fluff pulp fibers. The gram weight of the first wood pulp fiber layer or the second wood pulp fiber layer accounts for 10-42% of the total gram weight of the composite multi-layer non-woven fabric.

9. The method of producing a composite multi-layer nonwoven fabric according to any one of claims 1 to 8, characterized in that, The method comprises the following steps: (1) an initial first surface layer is prepared by using a melt-blowing method, and then the initial first surface layer is sequentially subjected to a spraying treatment and drying to obtain a first surface layer, wherein the spraying treatment uses a spraying liquid, and the spraying liquid comprises a functional additive and water; (2) a second wood pulp fiber layer is prepared on the upper surface of the second surface layer; (3) a second absorption outer layer is prepared on the upper surface of the second wood pulp fiber layer by using a melt-blowing method; (4) a first absorption outer layer is prepared on the upper surface of the second absorption outer layer by using a melt-blowing method; (5) a first wood pulp fiber layer is prepared on the upper surface of the first absorption outer layer; (6) an initial first surface layer is prepared on the upper surface of the first wood pulp fiber layer by using a melt-blowing method, and then the initial first surface layer is sequentially subjected to a spraying treatment and drying to obtain a first surface layer, wherein the spraying treatment uses a spraying liquid, and the spraying liquid comprises a functional additive and water; a multi-layer structure product is obtained; (7) the multi-layer structure product is subjected to hot rolling to obtain the composite multi-layer nonwoven fabric.

10. The method of claim 9, wherein, In step (1) or step (6), the mass percentage content of the functional additive in the spraying liquid is 0.5-6%; and the spraying amount of the spraying 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 that the hot air temperature is 200-260 ℃, and the hot air flow rate is 2000-5500 m³ / h.

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