A hydrophilic and lipophilic nonwoven fabric, its preparation method and application

Abstract

The present invention relates to a hydrophilic and lipophilic non-woven fabric, its preparation method and application, including a non-woven fabric substrate having a recessive hydrophilic layer after hydrophilic finishing treatment, and then a plurality of recessive lipophilic regions are provided on the surface layer and / or bottom layer of the non-woven fabric substrate. The recessive lipophilic regions divide the hydrophilic layer into several recessive hydrophilic regions, so that recessive lipophilic regions and recessive hydrophilic regions are distributed alternately on the surface layer and / or bottom layer. These recessive lipophilic regions and recessive hydrophilic regions become dominant lipophilic regions and dominant hydrophilic regions after contacting human body fluids, and both will form patterns or appear as patterns, and are realized by the following method: the first rotating screen of the first spraying device is used to implement fixed-point and quantitative oil agent coating on the surface layer of the non-woven fabric substrate, the second rotating screen of the second spraying device is used to implement fixed-point and quantitative oil agent coating on the bottom layer of the non-woven fabric substrate, and the non-woven fabric is applied to fields such as disposable absorbent products.

Description

Technical Field

[0001] The present invention belongs to the field of sanitary materials, and particularly relates to a hydrophilic and lipophilic non-woven fabric, a preparation method thereof and an application thereof. Background Art

[0002] Disposable absorbent articles such as diapers and sanitary napkins all use non-woven fabrics treated with hydrophilic treatment as the surface layer material or the wrapping layer of the absorbent core. However, most of the non-woven fabrics used in disposable absorbent articles only have a simple hydrophilic function.

[0003] Although this hydrophilic non-woven fabric is beneficial to the initial liquid penetration, as the number of absorption times increases, its liquid penetration rate will become slower and slower, and the rewet amount is large. Non-woven fabrics are also widely used in daily necessities such as wiping cloths. However, for traditional wiping cloths, they mostly only have simple hydrophilic or lipophilic functions, and have a poor absorption effect on liquids that are both oily and aqueous. Most of the non-woven fabrics used in disposable absorbent articles only have a simple hydrophilic function.

[0004] In view of the above problems, the prior art with the publication number of CN108130732B discloses a preparation method of a dual-functional non-woven fabric, which is characterized in that the non-woven fabric base layer includes an upper and a lower combined first fiber web layer and a second fiber web layer; the first fiber web layer is composed of PE / PP fibers or PE / PEP fibers, and the fineness of the fibers is 6-12D; the second fiber web layer is composed of fine denier fibers of 1-1.5 D, and the fine denier fibers are of an eccentric structure and are three-dimensionally crimped, and the fine denier fibers are PE / PET fibers; a plurality of hydrophilic regions and a plurality of lipophilic regions are provided on the non-woven fabric base layer, the hydrophilic regions and the lipophilic regions are arranged alternately with each other, the area of each region is 0.5-3 square millimeters, and the number of hydrophilic regions and lipophilic regions per square centimeter is 30-70 respectively, wherein: the hydrophilic regions are formed by impregnating the non-woven fabric in the range of this region with a hydrophilic finishing agent; the lipophilic regions are formed by impregnating the non-woven fabric in the range of this region with a lipophilic finishing agent. In addition, a plurality of through holes are provided on the non-woven fabric base layer, the area of each through hole is 1-3 mm2, the opening rate is 50%-70%, and the shape of the through hole is circular, rectangular or rhombic; the through hole is funnel-shaped, and its aperture becomes smaller along the liquid penetration direction; wherein, each lipophilic region and each hydrophilic region each have at least one of the through holes or are in contact with a through hole.

[0005] The preparation method of the above-mentioned amphiphilic nonwoven fabric comprises the following steps: adopting an impregnation process to impregnate a hydrophilic finishing agent and a lipophilic finishing agent on a nonwoven fabric base layer respectively, forming a plurality of hydrophilic regions and a plurality of lipophilic regions, wherein the lipophilic regions and the hydrophilic regions are arranged alternately. The device used in the impregnation process comprises a first roller brush, a second roller brush, a third roller brush and a fourth roller brush; the first roller brush and the second roller brush have the same structure, and a plurality of convex parts are arranged on their surfaces, and a first printing head is arranged on each of the convex parts, and the first printing head is impregnated with a lipophilic finishing agent; the third roller brush and the fourth roller brush have the same structure, and a plurality of convex parts are arranged on their surfaces, and a second printing head is arranged on each of the convex parts, and the second printing head is impregnated with a hydrophilic finishing agent. The specific steps of the impregnation process are as follows:

[0006] (1) At a temperature of 50-56 °C, a lipophilic finishing agent with a viscosity of 6000-12000 mPa·s is coated on the surface of the nonwoven fabric base layer, and it is allowed to penetrate and enter the interior of the nonwoven fabric base layer to form a lipophilic region. The air humidity during lipophilic finishing is 70%-85%.

[0007] (2) At a temperature of 20-30 °C, a hydrophilic finishing agent with a viscosity of 10000-15000 mPa·s is coated on the surface of the nonwoven fabric base layer, and it is allowed to penetrate and enter the interior of the nonwoven fabric base layer to form a hydrophilic region. The air humidity during hydrophilic finishing is 50%-60%.

[0008] 70%-85%.

[0009] (3) The nonwoven fabric base layer impregnated with the lipophilic finishing agent and the hydrophilic finishing agent is fed into a drying oven at a temperature of 60-80 °C through a guide roller, and the nonwoven fabric is obtained after winding.

[0010] (4) The nonwoven fabric obtained in step (3) is placed in a curing chamber at a temperature of 50-60 °C, and the curing time is 4-6 hours.

[0011] 60%.

[0012] (3) Feed the nonwoven fabric base layer impregnated with the lipophilic finishing agent and the hydrophilic finishing agent into a drying oven at 60-80 °C through a guide roller, and obtain the nonwoven fabric after winding.

[0013] (4) Place the nonwoven fabric obtained in step (3) in a curing chamber at 50-60 °C, and the curing time is 4-6 hours.

[0014] (4) Place the nonwoven fabric obtained in step (3) in a curing chamber at a temperature of 50-60 °C, and the curing time is 4-6 hours.

[0015] In view of the above problems, the prior art with the publication number CN110801349B discloses an absorbent core, which is characterized in that the absorbent core comprises: an upper spunbond nonwoven fabric, a lower hydroentangled nonwoven fabric, and an absorbent layer disposed between the two nonwoven fabrics; wherein the absorbent layer is composed of alternately arranged high water absorbent resin columns and superabsorbent fiber columns; on the upper spunbond nonwoven fabric, the part corresponding to the high water absorbent resin column is a water-repellent treatment column, and the part corresponding to the superabsorbent fiber column is a hydrophilic treatment column; on the lower hydroentangled nonwoven fabric, the part corresponding to the high water absorbent resin column is a hydrophilic treatment column, and the part corresponding to the superabsorbent fiber column is a water-repellent treatment column; the upper spunbond nonwoven fabric is treated with hydrophilic and water-repellent alternately, the hydrophilic width is 3-5 mm, and the water-repellent width is 4-6 mm; the lower hydroentangled nonwoven fabric is also treated with hydrophilic and water-repellent alternately, the water-repellent width is 3-5 mm, and the hydrophilic width is 4-6 mm; in the hydrophilic part of the upper spunbond nonwoven fabric, the hydrophilic degree is weak in the middle and gradually increases towards both sides; the water-repellent part is strong in the middle and gradually weakens towards both sides; in the hydrophilic part of the lower hydroentangled nonwoven fabric, the hydrophilic strength shows a bimodal distribution, with the strongest hydrophilicity at the 1 / 4 and 3 / 4 positions of the core and the weakest hydrophilicity at the two ends and the middle position; the water-repellent part is completely water-repellent.

[0016] However, although this printing-type roll coating process can roll-coat the oil-affinitive area on the surface layer and / or bottom layer of the hydrophilic nonwoven fabric, it is difficult to implement this process when it is necessary to implement the oil-affinitive coating at a fixed point and quantitatively, especially to implement the oil-affinitive coating quantitatively. The reason lies in that, on the one hand, if it is necessary to re-implement the oil-affinitive coating at a fixed point, the original roller used for roll coating cannot be used, and a new mold needs to be customized, increasing the R & D and production costs. On the other hand, if it is necessary to implement the oil-affinitive coating quantitatively, such as increasing the thickness of the oil-affinitive coating according to the special needs of users, the existing process is completely difficult to achieve. The reason is that the existing roll coating process rolls the coating by impregnating the oil agent on the protrusions on the surface of the roller, and the amount of the oil agent impregnated by the protrusions is limited. When the oil agent completely covers the surface of the protrusions, the oil agent loading cannot be increased anymore.

[0017] For the above reasons, the inventors of the present application have formed a preparation method that can implement the oil-affinitive coating at a fixed point and quantitatively through countless experiments and verifications, and solve the above problems by using a spraying device to perform local coating on the nonwoven fabric substrate that has been treated hydrophilically at a fixed point and quantitatively. Summary of the Invention

[0018] The present application aims to solve the technical problems described in the background art, and provides a preparation method for forming an oil agent coating that can be implemented at a fixed point and quantitatively, so as to achieve local coating on the nonwoven fabric substrate at a fixed point and quantitatively.

[0019] The second problem to be solved in the present application is to obtain a hydrophilic and lipophilic nonwoven fabric by applying an lipophilic coating to a hydrophilic nonwoven fabric substrate using the above method. Since the lipophilic coating reduces the hydrophilic area, the nonwoven fabric can be used in disposable absorbent products while ensuring the liquid penetration rate of the nonwoven fabric. The lipophilic coating can not only improve the flow conduction and diffusion performance, but also inhibit the back-seepage of the liquid, which is beneficial to significantly reduce the back-seepage problem. When used as a wiping cloth, it can absorb both water and oil and has strong practicality.

[0020] The present application is implemented through the following technical scheme: the hydrophilic and oleophilic non-woven fabric comprises a non-woven fabric substrate, the non-woven fabric substrate is subjected to hydrophilic finishing treatment to form a hidden hydrophilic layer, a plurality of hidden oleophilic regions are provided on the surface layer or / and the bottom layer of the non-woven fabric substrate, the hidden oleophilic region divides the hydrophilic layer on the surface layer or / and the bottom layer of the non-woven fabric substrate into a plurality of hidden hydrophilic regions, thereby forming hidden oleophilic regions and hidden hydrophilic regions distributed alternately with each other on the surface layer or / and the bottom layer of the non-woven fabric substrate, such hidden oleophilic regions and hidden hydrophilic regions become explicit oleophilic regions and explicit hydrophilic regions after contacting human body fluids, and the explicit oleophilic regions and explicit hydrophilic regions will form patterns or appear as patterns.

[0021] Preferably, the oleophilic area on the surface of the nonwoven fabric substrate is staggered with the oleophilic area on the bottom layer of the nonwoven fabric substrate, and the total area of ​​the oleophilic area accounts for 5% to 95% of the total area of ​​the surface layer or the bottom layer.

[0022] Preferably, the oleophilic regions are evenly distributed in a rectangular array or evenly distributed in a staggered manner.

[0023] Preferably, the shape of the pattern includes a square, a rectangle, a diamond, a square, a circle, an oval, a star, a flower, a human figure, an animal, a cartoon pattern, a two-dimensional pattern or other patterns.

[0024] Preferably, the nonwoven fabric substrate is selected from cotton nonwoven fabric, or one selected from spunbond nonwoven fabric, hot air nonwoven fabric, hot rolled nonwoven fabric, spunbond / meltblown nonwoven fabric, and chemically bonded nonwoven fabric.

[0025] The present application further provides a method for preparing the non-woven fabric, which mainly includes a spraying device and a non-woven fabric substrate treated by hydrophilic treatment. The spraying device mainly includes a liquid storage tank, a pressure mechanism and a plurality of nozzles. The nozzles are communicated with the liquid storage tank through the pressure mechanism. Among them, the spraying device further includes a rotating screen mechanism, which includes a rotating screen, and a plurality of through holes are provided on the side surface of the rotating screen. The coating jet ejected from the nozzles sprays and coats the non-woven fabric substrate through the through holes. In a specific implementation process, it further includes a feeding device located before the spraying device, and a drying device and a winding device located after the spraying device. The non-woven fabric substrate is output from the feeding device and sequentially passes through the spraying and coating of the spraying device and the drying treatment of the drying device and then enters the winding device.

[0026] Among them, the spraying device includes a first spraying device arranged above the non-woven fabric substrate. The first spraying device uses a first rotating screen mechanism and nozzles to spray and coat the surface layer of the non-woven fabric substrate. The first rotating screen mechanism mainly consists of a first rotating screen and a rotating mechanism. Conical convex through holes are provided on the side wall of the first rotating screen. At the same time, the nozzles are arranged in the inner cavity of the first rotating screen. The conical convex through holes intermittently communicate the nozzles with the non-woven fabric substrate during the rotation of the first rotating screen, so that the coating jet ejected from the nozzles sprays and coats the surface layer of the non-woven fabric substrate at intervals.

[0027] Preferably, the rotating mechanism includes a rotating shaft and a bracket for supporting the rotating shaft. The rotating shaft is fixedly connected to one end side of the first rotating screen to drive the first rotating screen to rotate. The other end side of the first rotating screen has an opening, and an arc-shaped end cover is arranged circumferentially along the opening. The arc-shaped end cover is fixedly connected to the first rotating screen, so that a first liquid collecting tank is formed in the first rotating screen. The first liquid collecting tank returns to the liquid storage tank through the pressure mechanism;

[0028] The nozzles are vertically arranged below the rotating shaft and can be intermittently aligned and communicated with the conical convex through holes during the rotation of the first rotating screen.

[0029] Preferably, the conical convex through holes have conical side surfaces, and the cone tips are arranged towards the axis of the first rotating screen. The excess coating oil agent flows back and converges into the first liquid collecting tank through the conical side surfaces.

[0030] The method for coating the surface layer of the non-woven fabric substrate by using the above spraying device in the present application includes a non-woven fabric substrate treated by hydrophilic treatment, and then using a first spraying device to coat the surface layer of the non-woven fabric substrate, including the following steps:

[0031] Step 1: After the non-woven fabric substrate is output by the unwinding device, it enters the spray coating area. In this spray coating area, the rotating mechanism of the first spray device drives the first rotating screen to rotate at the production line speed. There are a plurality of conical convex through holes on the first rotating screen.

[0032] Step 2: The oil-loving finishing agent in the liquid storage tank is transported to the nozzle through the pressure mechanism and pipeline to form a downward coating jet. During the rotation of the first rotating screen, when the coating jet is aligned and communicated with the conical convex through hole, the coating jet passes through the conical convex through hole and is sprayed on the surface layer of the non-woven fabric substrate at fixed points and in a quantitative manner at intervals.

[0033] At the same time, the excess oil-loving finishing agent flows back through the conical side and is collected in the first liquid collection tank, and the oil-loving finishing agent is returned to the liquid storage tank through the pressure mechanism.

[0034] Step 3: After the coating treatment in Step 2, a plurality of oil-loving areas are formed on the surface layer of the non-woven fabric substrate, and the non-woven fabric A with an oil-loving coating on the surface layer is obtained.

[0035] Step 4: The non-woven fabric A is dried in the drying device and then wound by the winding device, or first subjected to slitting treatment and then wound by the winding device to obtain the finished product of the non-woven fabric A with an oil-loving coating on the surface layer.

[0036] The recessive oil-loving areas of the non-woven fabric A product separate the recessive hydrophilic layer on the surface layer of the non-woven fabric substrate into several recessive hydrophilic areas, so that recessive oil-loving areas and recessive hydrophilic areas are distributed alternately on the surface layer.

[0037] Among them, the spray device includes a second spray device arranged below the non-woven fabric substrate. The second spray device uses a second rotating screen mechanism and a nozzle to perform spray coating treatment on the bottom layer of the non-woven fabric substrate. The second rotating screen mechanism is mainly composed of a second rotating screen and a rotating mechanism. There are through holes on the side wall of the second rotating screen. At the same time, the nozzle is arranged in the inner cavity of the second rotating screen. The through holes are intermittently communicated with the nozzle and the non-woven fabric substrate during rotation, so that the coating jet ejected by the nozzle performs spray coating treatment on the bottom layer of the non-woven fabric substrate at intervals.

[0038] Preferably, a second liquid collection tank is arranged below the second rotating screen, and the oil-loving finishing agent in the second liquid collection tank is returned to the liquid storage tank.

[0039] Preferably, the rotating mechanism includes a rotating shaft and a bracket for supporting the rotating shaft. The rotating shaft is fixedly connected to one end side of the second rotating screen to drive the second rotating screen to rotate, and the other end side of the second rotating screen has an opening; the nozzle is vertically arranged above the rotating shaft and can be intermittently aligned and communicated with the through hole during the rotation of the second rotating screen.

[0040] The method of coating the bottom layer of the non-woven fabric substrate using the above-mentioned spraying device in this application includes a non-woven fabric substrate that has undergone a hydrophilic treatment, and then using a second spraying device to perform a coating treatment on the bottom layer of the non-woven fabric substrate, including the following steps:

[0041] Step 1: After the non-woven fabric substrate is output by the feeding device, it enters the spraying and coating area. In this spraying and coating area, the rotating mechanism of the second spraying device drives the second rotating screen to rotate at the production line speed. A plurality of through holes are provided in the second rotating screen.

[0042] Step 2: The lipophilic finishing agent in the liquid storage tank is transported to the nozzle through the pressure mechanism and pipeline to form an upward coating jet. During the rotation of the second rotating screen, when the coating jet is aligned and communicated with the through holes, the coating jet is sprayed onto the bottom layer of the non-woven fabric substrate at fixed points and in a quantitative manner at intervals through the through holes.

[0043] At the same time, the excess lipophilic finishing agent gathers in the second liquid collection tank and then flows back into the liquid storage tank.

[0044] Step 3: After the coating treatment in Step 2, a plurality of lipophilic areas are formed on the bottom layer of the non-woven fabric substrate to obtain a non-woven fabric B with a lipophilic coating treatment on the bottom layer.

[0045] Step 4: The non-woven fabric B is dried in the drying device and then wound by the winding device, or first subjected to a slitting treatment and then wound by the winding device to obtain a finished product of the non-woven fabric B with a lipophilic coating treatment on the bottom layer.

[0046] The recessed lipophilic areas of the non-woven fabric B product separate the hydrophilic layer on the bottom layer of the non-woven fabric substrate into several recessed hydrophilic areas, thereby forming recessed lipophilic areas and recessed hydrophilic areas that are alternately distributed on the bottom layer.

[0047] Preferably, the hole shape of the through holes includes a square, rectangle, rhombus, square, circle, ellipse, star, flower shape, human figure, animal figure, cartoon pattern, second-generation pattern or other patterns, and their distribution methods can adopt a rectangular array with evenly spaced intervals or staggered and evenly distributed.

[0048] In addition to the aforementioned spraying method, this application can also use a printing-type online roll coating process to roll coat the lipophilic finishing agent on the surface layer and / or bottom layer of the non-woven fabric substrate.

[0049] Finally, this application continues to provide the application of the hydrophilic and lipophilic non-woven fabric described in this application in disposable absorbent products or daily necessities. The disposable absorbent products include baby diapers, adult diapers, baby pull-ups or sanitary napkins, and the daily necessities include wiping cloths.

[0050] The beneficial effects achieved by the present invention are as follows:

[0051] 1. The spraying device of the present invention can perform oil agent coating on the non-woven fabric substrate at fixed points and in a quantitative manner. Among them, through the first spraying device, the surface layer of the non-woven fabric substrate can be coated with oil agent at fixed points and in a quantitative manner, and through the second spraying device, the bottom layer of the non-woven fabric substrate can be coated with oil agent at fixed points and in a quantitative manner.

[0052] 2. Since the present application applies a lipophilic coating (hydrophobic layer) to the surface layer or / and bottom layer of the non-woven fabric treated by hydrophilic treatment, this lipophilic coating reduces the hydrophilic area. When it is used in disposable absorbent articles, this lipophilic coating promotes the penetration speed of liquid due to improving the liquid diversion and diffusion performance. At the same time, this lipophilic coating can not only inhibit the reverse seepage of liquid, but also can greatly reduce the reverse seepage problem and improve the dryness. When used as a wiping cloth, it can absorb both water and oil, and has strong practicability. Description of the Drawings

[0053] Figure 1 It is a schematic diagram of the lipophilic area provided on the non-woven fabric substrate.

[0054] Figure 2 It is a Figure 1 Schematic structural diagram of the C-C sectional view.

[0055] Figure 3 It is a Figure 1 Another schematic structural diagram of the C-C sectional view.

[0056] Figure 4 It is a schematic structural diagram of the first spraying device.

[0057] Figure 5 It is a Figure 4 Schematic structural diagram of the B-B sectional view.

[0058] Figure 6 It is a schematic structural diagram of the conical convex through hole.

[0059] Figure 7 It is a schematic structural diagram of the second spraying device.

[0060] Figure 8 It is a Figure 7 Schematic structural diagram of the A-A sectional view. Detailed Embodiments

[0061] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are the preferred embodiments of the present invention and should not be regarded as excluding other embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts fall within the protection scope of the present invention.

[0062] In the claims, the description and the above-mentioned drawings of the present invention, unless otherwise clearly defined, when using terms such as "first", "second" or "third", etc., are used to distinguish different objects and not for describing a specific order.

[0063] In the claims, the description and the above-mentioned drawings of the present invention, unless otherwise clearly defined, for orientation terms, when using terms such as "center", "lateral", "longitudinal", "horizontal", "vertical", "top", "bottom", "inner", "outer", "upper", "lower", "front", "rear", "left", "right", "clockwise", "counterclockwise", etc. to indicate the orientation or position relationship, it is based on the orientation and position relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, so it cannot be understood as limiting the specific protection scope of the present invention.

[0064] In the claims, the description and the above-mentioned drawings of the present invention, unless otherwise clearly defined, when using the terms "fixed connection" or "fixedly connected", it should be understood in a broad sense, that is, any connection method without displacement relationship and relative rotation relationship between the two, that is, including non-detachable fixed connection, detachable fixed connection, being integrated into one body, and being fixed connected through other devices or elements.

[0065] In the claims, the description and the above-mentioned drawings of the present invention, when using terms such as "comprising", "having" and their variants, are intended to mean "including but not limited to".

[0066] Please also refer to the attached Figure 1-8 , the hydrophilic and lipophilic non-woven fabric described in the present invention includes a non-woven fabric substrate 1, and the non-woven fabric substrate 1 has been subjected to hydrophilic finishing treatment. Its structural feature is that a plurality of recessive lipophilic regions 2 are provided on the surface layer 11 or / and the bottom layer 12 of the non-woven fabric substrate. The recessive lipophilic regions 2 divide the recessive hydrophilic layer on the surface layer 11 or / and the bottom layer 12 of the non-woven fabric substrate into several recessive hydrophilic regions, so as to form recessive lipophilic regions 2 distributed alternately with each other on the surface layer or / and the bottom layer of the non-woven fabric substrate, and recessive hydrophilic regions outside the recessive lipophilic regions 2 (not shown in the figure). Such recessive lipophilic regions and recessive hydrophilic regions become dominant lipophilic regions and dominant hydrophilic regions after contacting human body fluids, and the dominant lipophilic regions and dominant hydrophilic regions will form patterns or appear in patterns.

[0067] Specifically, in the specific implementation manner, the recessive lipophilic region 2 can be provided on the surface layer 11 of the non-woven fabric substrate, or on the bottom layer 12, or on both the surface layer 11 and the bottom layer 12 simultaneously. Preferably, the lipophilic region on the surface layer of the non-woven fabric substrate and the recessive lipophilic region on the bottom layer of the non-woven fabric substrate are arranged in a staggered manner.

[0068] Specifically, the distribution form of the recessive lipophilic region 2 can be a rectangular array with uniform intervals between each other, or a staggered and uniform distribution.

[0069] Specifically, this application does not specifically limit the pattern shape of the dominant lipophilic region, but preferably the shape of the pattern includes a square, rectangle, rhombus, square shape, circle, ellipse, star, flower shape, human figure, animal figure, cartoon pattern, second-generation pattern or other patterns. Similarly, the dominant hydrophilic region can also be presented in the form of a square, rectangle, rhombus, square shape, circle, ellipse, star, flower shape, human figure, animal figure, cartoon pattern, second-generation pattern or other patterns. At the same time, the size of the lipophilic region is not specifically limited, and those skilled in the art can make a reasonable selection according to specific needs.

[0070] Specifically, the material of the non-woven fabric substrate 1 can be selected as cotton non-woven fabric, or one of spunbond non-woven fabric, thermal bonding non-woven fabric, hot rolling non-woven fabric, spunbond / meltblown non-woven fabric, and chemical bonding non-woven fabric.

[0071] In the method for preparing the hydrophilic and lipophilic non-woven fabric of this application, the raw material is the non-woven fabric substrate 1 that has been hydrophilically treated.

[0072] To obtain this hydrophilic and lipophilic non-woven fabric, a lipophilic finishing agent can be used to achieve it through a printing-type on-line roll coating process, that is: roll-coat the lipophilic finishing agent on the surface layer or / and the bottom layer of the non-woven fabric substrate. It should be noted that this application does not specifically limit the hydrophilic oil agent and the lipophilic finishing agent, and the lipophilic finishing agents commonly used in the art are applicable to this application. For example, a two-component lipophilic finishing agent includes additive A, such as fluoropolymer / silicon polymer, and additive B, such as surfactant. Those skilled in the art can also obtain it from commercially available products.

[0073] In addition, this printing-type on-line roll coating process is an existing process and has been familiarized and mastered by those skilled in the art. Those skilled in the art can also refer to the implementation manners disclosed in the prior art, such as the impregnation process and its implementation manners disclosed in the prior art with the publication numbers of CN110801349B and CN108130732B to implement the printing-type on-line roll coating process of this application.

[0074] However, although the printing type on-line roll coating process can roll coat the oil-loving area (hidden oil-loving area) on the surface layer or / and bottom layer of the hydrophilic non-woven fabric, it is difficult to implement this process when it is necessary to apply the oil-loving coating at a fixed point and in a fixed quantity, especially to apply the oil-loving coating quantitatively. The reason lies in that, on the one hand, if it is necessary to re-implement the oil-loving coating at a fixed point, the original roller used for roll coating cannot be used and a new mold needs to be customized, increasing the R & D and production costs. On the other hand, if it is necessary to apply the oil-loving coating quantitatively, such as increasing the thickness of the oil-loving coating according to the special needs of users, the existing process is completely difficult to achieve. The reason is that the existing roll coating process rolls the coating by impregnating the oil agent on the protrusions on the surface of the roller, and the amount of the oil agent impregnated by the protrusions is limited. When the oil agent completely covers the surface of the protrusions, the oil agent loading cannot be increased any more.

[0075] In the process methods for surface coating or bottom coating of non-woven fabric substrates in this field, the equipment devices mainly include a feeding device, a spraying device, a drying device, a slitting device and a winding device, among which: the spraying device mainly includes a liquid storage tank, a pressure mechanism and a plurality of nozzles, and the nozzles are communicated with the liquid storage tank through the pressure mechanism. Obviously, these equipment devices and their processes are all existing equipment and existing processes, and those skilled in the art can be familiar with and master them. The process is as follows: the non-woven fabric substrate is output from the feeding device and sequentially passes through the coating by the spraying device and the drying treatment by the drying device in the production line direction and then enters the winding device.

[0076] However, the existing spraying device can only coat the non-woven fabric substrate as a whole (the whole piece), and still cannot perform local coating on the non-woven fabric substrate at a fixed point and in a fixed quantity.

[0077] For the above reasons, the applicant of this application has carried out technical transformation and innovative design on the existing spraying device to form a spraying device with a new structure, and through countless tests and verifications, a preparation method that can implement the oil-loving coating at a fixed point and in a fixed quantity is formed. Through this spraying device, the non-woven fabric substrate treated by hydrophilic treatment can be locally coated at a fixed point and in a fixed quantity to solve the above problems. Its structural feature is that the spraying device includes a rotating mesh mechanism, the rotating mesh mechanism includes a rotating mesh, and a plurality of through holes are arranged on the side surface of the rotating mesh, and the coating jet ejected by the nozzle sprays and coats the non-woven fabric substrate through the through holes.

[0078] Obviously, in the specific implementation process, it also includes a feeding device before the spraying device, and a drying device and a winding device after the spraying device. The non-woven fabric substrate is output from the feeding device and sequentially passes through the coating by the spraying device and the drying treatment by the drying device in the production line direction and then enters the winding device.

[0079] The preparation method of the nonwoven fabric described in this application mainly includes a spraying device and a nonwoven fabric substrate treated by hydrophilic treatment. The spraying device mainly includes a liquid storage tank, a pressure mechanism, and a plurality of nozzles. The nozzles are connected to the liquid storage tank through the pressure mechanism. Among them, the spraying device also includes a rotating mesh mechanism. The rotating mesh mechanism includes a rotating mesh. A number of through holes are provided on the side surface of the rotating mesh. During the rotation of the rotating mesh, the coating jets ejected by the nozzles are intermittently aligned with the through holes, and then the nonwoven fabric substrate is subjected to fixed-point and quantitative spraying and coating treatment through the through holes. Among them:

[0080] (1) Use the first spraying device 4 to perform coating treatment on the surface layer of the nonwoven fabric substrate 1, and achieve it through the following methods:

[0081] The spraying device includes a first spraying device 4 arranged above the nonwoven fabric substrate. The first spraying device 4 uses a first rotating mesh mechanism and a nozzle 43 to perform spraying and coating treatment on the surface layer of the nonwoven fabric substrate. The first rotating mesh mechanism mainly consists of a first rotating mesh 41 and a rotating mechanism. Conical protruding through holes 42 are provided on the side wall of the first rotating mesh 41. At the same time, the nozzle 43 is arranged in the inner cavity of the first rotating mesh 41. The conical protruding through holes 42 intermittently communicate the nozzle with the nonwoven fabric substrate during rotation, so that the coating jets ejected by the nozzle 43 perform spraying and coating treatment on the surface layer 11 of the nonwoven fabric substrate 1 at intervals.

[0082] In the specific implementation manner, the rotating mechanism includes a rotating shaft and a bracket for supporting the rotating shaft (not shown in the figure). The rotating shaft can be directly driven by a motor or transmitted through a belt or gear, which is familiar to those skilled in the art.

[0083] The rotating shaft is fixedly connected to one end side of the first rotating mesh 41 to drive the first rotating mesh to rotate. The other end side of the first rotating mesh 41 has an opening, and an arc-shaped end cover 46 is provided circumferentially along the opening. The arc-shaped end cover 46 is fixedly connected to the first rotating mesh 41, so that a first liquid collection tank is constructed inside the first rotating mesh. The first liquid collection tank returns to the liquid storage tank 61 through the pressure mechanism 64 and the pipeline 65. Specifically, a support rod 44 is fixedly arranged on the bracket, and then the nozzle 43 is vertically arranged below the rotating shaft, that is, suspended and fixed below the rotating shaft in the manner of the support rod 44, so that the nozzle of the nozzle 43 always faces the surface layer 11 of the nonwoven fabric substrate and can be intermittently aligned and communicated with the conical protruding through holes 42 during the rotation of the first rotating mesh.

[0084] In the specific implementation manner, the conical raised through-hole 42 is processed to have not only the through-hole 411 but also a conical side surface 412, and its cone tip is arranged towards the axis line of the first rotating screen. The excess coating agent flows back through the conical side surface 412 and converges into the first liquid collecting tank.

[0085] The method for coating the surface layer 11 of the non-woven fabric substrate 1 treated by hydrophilic treatment by using the above-mentioned first spraying device 4 includes the following steps:

[0086] Step 1: After the non-woven fabric substrate 1 is output by the feeding device, it enters the spraying and coating area. In this spraying and coating area, the rotating mechanism of the first spraying device 4 drives the first rotating screen 41 to rotate at the production line speed. A plurality of conical raised through-holes 42 are provided on the first rotating screen 41.

[0087] Step 2: The lipophilic finishing agent (also called hydrophobic oil agent) in the liquid storage tank 61 is transported to the nozzle 43 through the pressure mechanism 62 and the pipeline 63 to form a downward coating jet. During the rotation of the first rotating screen, when the coating jet is aligned and communicated with the through-hole 411 of the conical raised through-hole 41, the coating jet sprays on the surface layer 11 of the non-woven fabric substrate at intervals through the conical raised through-hole.

[0088] Meanwhile, the excess lipophilic finishing agent flows back through the conical side surface 412 and converges into the first liquid collecting tank. The lipophilic finishing agent flows back to the liquid storage tank 61 through the pressure mechanism 64 and the pipeline 65.

[0089] Step 3: After the coating treatment in Step 2, a plurality of recessed lipophilic areas 2 are formed on the surface layer 11 of the non-woven fabric substrate 1, and the non-woven fabric A with a surface layer treated by lipophilic coating is obtained.

[0090] Step 4: The non-woven fabric A is dried in a drying device at 110 - 130 °C and then wound by a winding device, or is first slit and then wound by a winding device to obtain the finished product of the non-woven fabric A with a lipophilic coating on the surface layer.

[0091] The recessed lipophilic areas 2 of the non-woven fabric A product separate the recessed hydrophilic layer on the surface layer of the non-woven fabric substrate into several recessed hydrophilic areas, so that recessed lipophilic areas and recessed hydrophilic areas are distributed alternately on the surface layer.

[0092] (2) The bottom layer 12 of the non-woven fabric substrate 1 is coated by using the second spraying device 3, and the implementation is carried out in the following manner:

[0093] The spray device includes a second spray device 3 disposed below the non-woven fabric substrate. The second spray device 3 uses a second rotary screen mechanism and a nozzle 33 to perform spray coating treatment on the bottom layer 12 of the non-woven fabric substrate. The second rotary screen mechanism mainly consists of a second rotary screen 31 and a rotating mechanism. Through holes 32 are provided on the side wall of the second rotary screen 31. At the same time, the nozzle 33 is disposed in the inner cavity of the second rotary screen 31. The through holes 32 intermittently communicate the nozzle 33 with the non-woven fabric substrate 1 during the rotation of the second rotary screen 31, so that the coating jets ejected from the nozzle 33 perform fixed-point and quantitative spray coating treatment on the bottom layer 12 of the non-woven fabric substrate at intervals.

[0094] In a specific embodiment, a second liquid collection tank 54 is provided below the second rotary screen, and the oil-loving finishing agent in the second liquid collection tank 54 is refluxed to the liquid storage tank 51.

[0095] In a specific embodiment, similarly, in specific implementation, the rotating mechanism is provided with brackets. The rotating mechanism includes a rotating shaft and brackets 35, 36 for supporting the rotating shaft. The rotating shaft is fixedly connected to one end side of the second rotary screen 31, thereby driving the second rotary screen 31 to rotate, and the other end side of the second rotary screen 31 has an opening. A support rod 34 is fixedly provided on the bracket, and the nozzle 33 is vertically arranged above the rotating shaft, that is, suspended and fixed above the rotating shaft in the form of the support rod 34, so that the nozzle of the nozzle 33 always faces the bottom layer 12 of the non-woven fabric substrate and can be intermittently aligned and communicated with the through hole 32 during the rotation of the second rotary screen 31.

[0096] The method for coating the bottom layer of the non-woven fabric substrate treated by hydrophilic treatment by using the above-mentioned second spray device 3 in this application includes the following steps:

[0097] Step 1: After the non-woven fabric substrate 1 is output by the feeding device, it enters the spray coating area. In this spray coating area, the rotating mechanism of the second spray device 4 drives the second rotary screen 31 to rotate at the production line speed. A plurality of through holes 32 are provided on the second rotary screen 31.

[0098] Step 2: The oil-loving finishing agent in the liquid storage tank 51 is transported to the nozzle 33 through the pressure mechanism 52 and the pipeline 53 to form an upward coating jet. During the rotation of the second rotary screen 31, when the coating jet is aligned and communicated with the through hole 32, the coating jet is sprayed on the bottom layer 12 of the non-woven fabric substrate at intervals through the through hole.

[0099] At the same time, the excess oil-loving finishing agent is collected in the second liquid collection tank 54 and then refluxed to the liquid storage tank 51 through the pipeline 55.

[0100] Step 3: After the coating treatment in Step 2, a plurality of lipophilic regions 2 are coated and formed on the bottom layer 12 of the nonwoven fabric substrate to obtain the nonwoven fabric B with the bottom layer subjected to lipophilic coating treatment.

[0101] Step 4: After drying the nonwoven fabric B in a drying device, it is wound by a winding device, or first subjected to slitting treatment and then wound by the winding device to obtain the finished product of the nonwoven fabric B with the bottom layer subjected to lipophilic coating treatment.

[0102] The recessive lipophilic regions 2 of the nonwoven fabric B product separate the hydrophilic layer on the bottom layer of the nonwoven fabric substrate into several recessive hydrophilic regions, thereby forming recessive lipophilic regions and recessive hydrophilic regions that are alternately distributed on the bottom layer.

[0103] In the specific implementation manner, the shapes of the through holes and the tapered raised through holes 42 can all adopt square, rectangular, rhombic, square, circular, oval, star-shaped, flower-shaped, human-shaped, animal-shaped, cartoon patterns or other patterns, and their distribution methods can adopt a rectangular array with uniform intervals from each other, or staggered and evenly distributed.

[0104] In addition to the aforementioned spraying method, the present application can also adopt a printing type on-line roll coating process to roll coat the lipophilic finishing agent on the surface layer and / or bottom layer of the nonwoven fabric substrate.

[0105] Obviously, the spraying device described in the present application can also be used for the fixed-point and quantitative hydrophilic coating treatment of the nonwoven fabric substrate. Note that the "fixed-point" expression described herein is only a concept of relative position, that is, the oil agent coating is continuously implemented on the nonwoven fabric substrate along the production line direction in the same distribution method and interval method (such as the designed distribution method).

[0106] Finally, the present application continues to provide the application of the hydrophilic and lipophilic nonwoven fabric described in the present application in disposable absorbent articles or daily necessities. The disposable absorbent articles include baby diapers, adult diapers, baby pull-ups or sanitary napkins. For example, the hydrophilic and lipophilic nonwoven fabric can be used as the surface layer of the disposable absorbent article, or as the surface covering layer of the absorbent core, and can also be used as a diversion layer; in the daily necessities, it can be used as a wiping cloth.

[0107] Performance Test

[0108] 1. The absorption performance is tested under the conditions specified in GB / T 28004-2021.

[0109] 2. Test samples:

[0110] (1) A certain brand of diaper, which uses a composite absorbent core as the absorbent core, size L, a commercially available product. This product is used as the comparative sample 1.

[0111] (2) The hydrophilic non-woven fabric (thermal bonded non-woven fabric), used as the surface layer of the diaper, is a commercially available product. By the method of manual sample preparation, the surface layer in Comparative Sample 1 was replaced with this hydrophilic non-woven fabric to obtain Comparative Sample 2. Those skilled in the art are familiar with the method of manual sample preparation.

[0112] (3) By using the method of the present application, a plurality of rhombus-shaped recessive oleophilic regions are provided on the surface layer of the hydrophilic non-woven fabric. The recessive oleophilic regions in adjacent columns are evenly distributed in a staggered manner. The total area of the oleophilic regions accounts for 45% of the total area of the surface layer of the hydrophilic non-woven fabric, forming the hydrophilic and oleophilic non-woven fabric A. Among them, the thickness of the oleophilic coating is the conventional thickness of the oil agent coating in the art. By the method of manual sample preparation, the surface layer in Comparative Sample 1 was replaced with this hydrophilic and oleophilic non-woven fabric A to obtain Test Sample 1.

[0113] By using the method of the present application, a plurality of rhombus-shaped recessive oleophilic regions are provided on the surface layer of the hydrophilic non-woven fabric. At the same time, a number of recessive oleophilic regions are also provided on the bottom layer of the hydrophilic non-woven fabric. The recessive oleophilic regions on the bottom layer and the recessive oleophilic regions on the surface layer are arranged in a staggered manner in space. The total area of the recessive oleophilic regions accounts for 40% of the total area of the surface layer of the hydrophilic non-woven fabric, forming the hydrophilic and oleophilic non-woven fabric B. By the method of manual sample preparation, the surface layer in Comparative Sample 1 was replaced with this hydrophilic and oleophilic non-woven fabric B to obtain Test Sample 2.

[0114] Test Results (1):

[0115]

[0116] The above test data show that since the surface layer of the non-woven fabric of Test Sample 1 is provided with an oleophilic coating (hydrophobic layer), and the surface layer and the bottom layer of the non-woven fabric of Test Sample 2 are respectively provided with an oleophilic coating (hydrophobic layer), the commonality of the two is that the oleophilic coating reduces the hydrophilic area. When it is used in a disposable absorbent article, the oleophilic coating improves the liquid guiding and diffusing performance, and thus also promotes the liquid penetration speed. At the same time, the oleophilic coating can not only inhibit the liquid rewet, but also can greatly reduce the rewet problem and improve the dryness.

[0117] In addition, such recessive oleophilic regions and recessive hydrophilic regions become dominant oleophilic regions after contacting the test liquid to form dominant oleophilic regions and dominant hydrophilic regions. Among them, the dominant oleophilic regions appear in a rhombus pattern.

[0118] The foregoing description illustrates and describes preferred embodiments of the present invention. As previously mentioned, it should be understood that the present invention is not limited to the forms disclosed herein, should not be construed as excluding other embodiments, but can be used in various other combinations, modifications, and environments, and can be altered within the scope of the inventive concept described herein through the above teachings or the skills or knowledge in the relevant field. Any alterations and variations made by those skilled in the art without departing from the spirit and scope of the present invention shall fall within the protection scope of the appended claims of the present invention.

Claims

1. A preparation method of a hydrophilic and lipophilic non-woven fabric, including a non-woven fabric substrate, the non-woven fabric substrate is subjected to hydrophilic finishing treatment to form a recessive hydrophilic layer, and a plurality of recessive lipophilic regions are provided on the surface layer and / or bottom layer of the non-woven fabric substrate. The recessive lipophilic regions divide the recessive hydrophilic layer on the surface layer and / or bottom layer of the non-woven fabric substrate into several recessive hydrophilic regions, so as to form recessive lipophilic regions and recessive hydrophilic regions that are alternately distributed on the surface layer and / or bottom layer of the non-woven fabric substrate. These recessive lipophilic regions and recessive hydrophilic regions become dominant lipophilic regions and dominant hydrophilic regions after contacting human body fluids, and the dominant lipophilic regions and dominant hydrophilic regions will form patterns or appear in patterns. It is characterized in that: It mainly includes a spraying device, and the spraying device mainly includes a liquid storage tank, a first pressure mechanism, a plurality of nozzles, and a rotating net mechanism, where: The rotating net mechanism includes a rotating net, and a number of conical raised through-holes are provided on the side surface of the rotating net. The conical raised through-holes have conical side surfaces, and their cone tips are arranged towards the axis line of the rotating net. At the same time, the nozzles are arranged in the inner cavity of the rotating net, and the spray ports of the nozzles are aligned with the surface layer or the bottom layer of the non-woven fabric substrate. The nozzles are communicated with the liquid storage tank through the first pressure mechanism; The conical raised through-holes intermittently communicate the nozzles with the non-woven fabric substrate during the rotation of the rotating net, so that the coating jets ejected by the nozzles perform fixed-point and quantitative spraying and coating treatment on the non-woven fabric substrate at intervals during the rotation of the rotating net through the conical raised through-holes; A liquid collecting tank is constructed in the rotating net, and the excess coating oil agent flows back and converges into the liquid collecting tank through the conical side surface, and the liquid collecting tank flows back to the liquid storage tank through the second pressure mechanism.

2. The preparation method according to claim 1, characterized in that: It further includes a feeding device located before the spraying device, and a drying device and a winding device located after the spraying device. The non-woven fabric substrate is output from the feeding device and sequentially passes through the spraying and coating of the spraying device and the drying treatment of the drying device and then enters the winding device according to the production line direction.

3. The preparation method according to claim 1, characterized in that: The spraying device includes a first spraying device arranged above the non-woven fabric substrate. The first spraying device uses a first rotating net mechanism and nozzles to perform spraying and coating treatment on the surface layer of the non-woven fabric substrate. The first rotating net mechanism is mainly composed of a first rotating net and a rotating mechanism. Conical raised through-holes are provided on the side wall of the first rotating net. At the same time, the nozzles are arranged in the inner cavity of the first rotating net. The conical raised through-holes intermittently communicate the nozzles with the non-woven fabric substrate during the rotation of the first rotating net, so that the coating jets ejected by the nozzles perform fixed-point and quantitative spraying and coating treatment on the surface layer of the non-woven fabric substrate at intervals.

4. The preparation method according to claim 3, characterized in that: The rotating mechanism includes a rotating shaft and a bracket for supporting the rotating shaft. The rotating shaft is fixedly connected to one end side of the rotating net to drive the rotating net to rotate. The other end side of the rotating net has an opening, and an arc-shaped end cover is arranged circumferentially along the opening. The arc-shaped end cover is fixedly connected to the rotating net, so that a first liquid collecting tank is constructed in the rotating net. The first liquid collecting tank flows back to the liquid storage tank through the second pressure mechanism; The nozzles are vertically arranged below the rotating shaft and can be intermittently aligned and communicated with the conical raised through-holes during the rotation of the first rotating net.

5. The preparation method according to claim 4, including a non-woven fabric substrate subjected to hydrophilic treatment, and then using a first spraying device to perform coating treatment on the surface layer of the non-woven fabric substrate, including the following steps: Step 1: After the non-woven fabric substrate is output from the feeding device, it enters the spraying and coating area. In this spraying and coating area, the rotating mechanism of the first spraying device drives the first rotating net to rotate at the production line speed. A plurality of conical raised through-holes are provided on the first rotating net; Step 2: The lipophilic finishing agent in the liquid storage tank is transported to the nozzle through the first pressure mechanism and pipeline to form a downward coating jet. During the rotation of the first rotating screen, when the coating jet is aligned and communicated with the through holes of the conical protrusions, the coating jet passes through the through holes of the conical protrusions and is sprayed onto the surface layer of the nonwoven fabric substrate at fixed points and in a quantitative manner at intervals. Meanwhile, the excess lipophilic finishing agent flows back and converges into the first liquid collection tank through the conical side, and the lipophilic finishing agent is returned to the liquid storage tank through the second pressure mechanism. Step 3: After the coating treatment in Step 2, a plurality of recessive lipophilic regions are formed on the surface layer of the nonwoven fabric substrate, and the nonwoven fabric A with a lipophilic-coated surface layer is obtained. Step 4: The nonwoven fabric A is dried in the drying device and then wound by the winding device, or is first slit and then wound by the winding device to obtain the finished product of the nonwoven fabric A with a lipophilic-coated surface layer. The recessive lipophilic regions of the nonwoven fabric A product divide the recessive hydrophilic layer on the surface layer of the nonwoven fabric substrate into several recessive hydrophilic regions, thereby forming recessive lipophilic regions and recessive hydrophilic regions that are alternately distributed on the surface layer.

6. The preparation method according to claim 1, characterized in that: The spraying device includes a second spraying device disposed below the nonwoven fabric substrate. The second spraying device uses a second rotating screen mechanism and a nozzle to perform spraying and coating treatment on the bottom layer of the nonwoven fabric substrate. The second rotating screen mechanism mainly consists of a second rotating screen and a rotating mechanism. Conical protrusion through holes are provided on the side wall of the second rotating screen. At the same time, the nozzle is disposed in the inner cavity of the second rotating screen. The conical protrusion through holes intermittently communicate the nozzle with the nonwoven fabric substrate during the rotation of the second rotating screen, so that the coating jet ejected from the nozzle performs fixed-point and quantitative spraying and coating treatment on the bottom layer of the nonwoven fabric substrate at intervals.

7. The preparation method according to claim 6, characterized in that: A second liquid collection tank is disposed below the second rotating screen, and the lipophilic finishing agent in the second liquid collection tank is returned to the liquid storage tank.

8. The preparation method according to claim 7, characterized in that: The rotating mechanism includes a rotating shaft and a bracket for supporting the rotating shaft. The rotating shaft is fixedly connected to one end side of the second rotating screen to drive the rotating screen to rotate, and the other end side of the second rotating screen has an opening; the nozzle is vertically disposed above the rotating shaft and can be intermittently aligned and communicated with the conical protrusion through holes during the rotation of the second rotating screen.

9. The preparation method according to claim 8, including a nonwoven fabric substrate that has been hydrophilized, and then using a second spraying device to perform coating treatment on the bottom layer of the nonwoven fabric substrate, including the following steps: Step 1: After the nonwoven fabric substrate is output by the unwinding device, it enters the spraying and coating area. In the spraying and coating area, the rotating mechanism of the second spraying device drives the second rotating screen to rotate at the production line speed. A plurality of conical protrusion through holes are provided on the second rotating screen. Step 2: The lipophilic finishing agent in the liquid storage tank is transported to the nozzle through the first pressure mechanism and pipeline to form an upward coating jet. During the rotation of the second rotating screen, when the coating jet is aligned and communicated with the conical protrusion through holes, the coating jet passes through the conical protrusion through holes and is sprayed onto the bottom layer of the nonwoven fabric substrate at fixed points and in a quantitative manner at intervals. Meanwhile, the redundant lipophilic finishing agent converges into the second liquid collecting tank and then flows back into the liquid storage tank; Step 3: After the coating treatment in Step 2, a plurality of recessive lipophilic areas are coated and formed on the bottom layer of the non-woven fabric substrate to obtain a non-woven fabric B with the bottom layer subjected to lipophilic coating treatment; Step 4: The non-woven fabric B is dried in a drying device and then wound by a winding device, or is first slit and then wound by a winding device to obtain a finished non-woven fabric B with the bottom layer subjected to lipophilic coating treatment; The recessive lipophilic areas of the non-woven fabric B product separate the recessive hydrophilic layer on the bottom layer of the non-woven fabric substrate into several recessive hydrophilic areas, thereby forming recessive lipophilic areas and recessive hydrophilic areas that are alternately distributed on the bottom layer.

10. The preparation method according to any one of claims 1-4, 6-8, characterized in that: The hole shape of the conical raised through hole includes a square, a rectangle, a rhombus, a square shape, a circle, an ellipse, a star shape, a flower shape, a human shape, an animal shape or a cartoon pattern, and its distribution pattern can be evenly distributed at intervals in a rectangular array or evenly distributed in a staggered manner.

11. The preparation method according to any one of claims 1-4, 6-8, characterized in that: The recessive lipophilic areas are evenly distributed at intervals in a rectangular array or evenly distributed in a staggered manner, and the total area of the recessive lipophilic areas accounts for 5%-95% of the total area of the surface layer or the bottom layer.

12. According to the preparation method described in any one of claims 1-4, 6-8, it is characterized in that: The pattern shape includes a square, a rectangle, a rhombus, a square shape, a circle, an ellipse, a star shape, a flower shape, a human shape, an animal shape, a cartoon pattern or a second-generation pattern.

13. According to the preparation method described in any one of claims 1-4, 6-8, it is characterized in that: The recessive lipophilic areas on the surface layer of the non-woven fabric substrate are distributed in a staggered manner with the recessive lipophilic areas on the bottom layer of the non-woven fabric substrate.

14. According to the preparation method described in any one of claims 1-4, 6-8, it is characterized in that: The non-woven fabric substrate is made of cotton non-woven fabric or selected from one of spunbond non-woven fabric, thermal bonded non-woven fabric, hot-rolled non-woven fabric, spunbond / meltblown non-woven fabric, and chemically bonded non-woven fabric.

15. Application of a hydrophilic and lipophilic non-woven fabric manufactured by the manufacturing method described in any one of 1-4, 6-8 in a disposable absorbent article or a daily necessity, wherein the disposable absorbent article includes a baby diaper, an adult diaper, a baby pull-up diaper or a sanitary napkin, and the daily necessity includes a wiping cloth.

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