Stable adult paper diaper and preparation method thereof

Abstract

The invention discloses a stable adult paper diaper and a preparation method thereof, and relates to the technical field of adult paper diapers. A stable adult paper diaper comprises a flow guide layer formed by compositing a diffusion layer and a slow permeation layer through a spunlace method, the diffusion layer is of a composite non-woven fabric base structure formed by compositing hydrophilic ES fibers, PLA fibers and modal fibers, and the slow permeation layer is of a high-fluffiness composite cotton core structure formed by compositing natural cotton and fluff pulp. The liquid adopted by the diversion layer in the spunlace compounding process is modified finishing liquid, and the modified finishing liquid is prepared by mixing soft water, a surfactant and a nano-porous filler. According to the technical scheme, the fiber flow guide structure of the flow guide layer can be effectively improved, the flow guide layer has higher flow guide performance and anti-back-seepage performance, and the phenomena of liquid accumulation, side leakage or waterlogging back-seepage and the like of the adult paper diaper can be prevented.

Description

Technical Field

[0001] The present invention relates to the field of adult diapers, and in particular to a stable adult diaper and a preparation method thereof. Background Art

[0002] The structure of an adult diaper mainly consists of a surface layer, a diversion layer, an absorption core layer, and a leak-proof bottom film. Among them, as Figure 1 shown, generally, an adult diaper will compound the two sides of the surface layer 1, the diversion layer 2, and the bottom film by hot pressing, ultrasonic bonding, or adhesive bonding, and bury the absorption core layer 3 between the diversion layer 2 and the bottom film to form a four-layer structure.

[0003] When the diaper absorbs urine, the urine will penetrate through the surface layer 1 and be transported to the diversion layer 2. Then, the urine is absorbed by the diversion layer 2 and guided to spread along the longitudinal direction and both sides of the diaper. While the urine is spreading and diverting, it continues to penetrate in the direction of the absorption core layer 3 and is finally fully absorbed by the absorption core layer 3. At the same time, the diversion layer 2 can also play a certain anti-backflow effect, which can prevent urine from backflowing out of the absorption core layer 3 and into the surface layer 1 before the absorption core layer 3 fully absorbs the urine, so as to ensure the wearing comfort of the diaper.

[0004] At present, the diversion ability and anti-backflow ability of the diversion layer 2 material of some adult diapers on the market are not good. When encountering a large amount of urine, the diffusion speed of urine in the diversion layer 2 is slow, which easily leads to excessive accumulation of urine at local positions of the absorption core layer 3. This not only affects the uniform liquid absorption of the absorption core layer 3 and the low utilization rate of the absorption core layer 3, but also the accumulated urine may cause phenomena such as side leakage or flooding backflow, and the liquid absorption stability is not high, seriously affecting the wearing experience. Summary of the Invention

[0005] In order to improve the diversion layer structure of adult diapers, enhance the diversion ability and anti-backflow ability of the diversion layer, prevent phenomena such as liquid accumulation, side leakage, or flooding backflow in adult diapers, and improve the liquid absorption stability of adult diapers, the present application provides a stable adult diaper and a preparation method thereof.

[0006] In the first aspect, a stable adult diaper provided by the present application adopts the following technical solution: A stable adult diaper includes a surface layer, a diversion layer, an absorption core layer, and a breathable bottom film arranged in sequence. The diversion layer is compounded by a diffusion layer and a slow-permeation layer through a hydrospinning method, and the diffusion layer is located on the side of the slow-permeation layer close to the surface layer; Among them, the diffusion layer is a composite non-woven fabric-based structure, which is composed of hydrophilic ES fibers, modal fibers, and PLA fibers after being opened and carded. The mass ratio of the hydrophilic ES fibers, the PLA fibers, and the modal fibers is (2 - 3.5):(6 - 7):(0.5 - 1); Among them, the slow seepage layer is a high-fluff composite cotton core structure, which is composed of natural cotton and fluff pulp after being opened and carded. The mass ratio of the cotton fibers to the fluff pulp is 1:(0.4 - 0.8); Among them, the liquid used in the spunlace composite process of the diversion layer is a modified finishing liquid, which is prepared by mixing soft water, a surfactant, and nano-porous fillers.

[0007] By adopting the above technical solution, a diversion layer is formed by compounding a diffusion layer with a composite non-woven fabric-based structure and a slow seepage layer with a composite cotton core structure. In combination with the spunlace composite process using a modified finishing liquid, it can effectively improve the fiber diversion structure of the diversion layer, making the diversion layer have higher diversion performance and anti-backflow performance, which is beneficial to preventing phenomena such as liquid accumulation, side leakage, or backflow of soaking in adult diapers, and has higher liquid absorption stability. In addition, due to the additional addition of nano-porous fillers in the modified finishing liquid, the nano-porous fillers can be fully dispersed on the surface of the fibers of the diversion layer with the modified finishing liquid in the spunlace composite process, and through the porous structure, the diversion layer can achieve other effects such as auxiliary water absorption, antibacterial, and deodorization, which is beneficial to further improving the overall functional effect of the diversion layer.

[0008] Optionally, the modified finishing liquid is prepared by mixing the following raw materials in parts by weight: Soft water: 100 parts; Modified polyether siloxane phosphate: 12 - 20 parts; Sodium dodecyl sulfonate: 3 - 8 parts; Nano-porous fillers: 10 - 15 parts; Among them, the nano-porous fillers are at least one of nano-porous carbon powder, nano-montmorillonite, and nano-diatomite.

[0009] By adopting the above technical solution, using modified polyether siloxane phosphate and sodium dodecyl sulfonate as surface modifiers can not only endow the fibers in the diffusion layer and the slow-permeation layer with excellent softness, antistatic property and hydrophilicity, which is beneficial to enabling the diversion layer to have better diversion performance and permeability, realizing the rapid diffusion and penetration of urine into the absorption core layer within a unit time and preventing urine backflow, but also, with the mutual cooperation of modified polyether siloxane phosphate and sodium dodecyl sulfonate, can further optimize the film-forming effect of the modified finishing liquid on the surface of the fibers in the diversion layer, which is beneficial to improving the modification effect of the modified finishing liquid. In addition, using at least one of nano-porous carbon powder, nano-montmorillonite and nano-diatomite as nano-porous fillers to be distributed in the diversion layer along with the modified finishing liquid can all achieve effects such as auxiliary water absorption, antibacterial and odor removal through their respective porous structures, and nano-montmorillonite and nano-diatomite can also form colloids in soft water, which is beneficial to further improving the film-forming effect and adhesion ability of the modified finishing liquid.

[0010] Optionally, the preparation method of the modified polyether siloxane phosphate includes the following steps: Pre-mix the terminal hydrogen-containing silicone oil and allyl glycidyl ether, add a platinum catalyst, then heat to 65 - 72 °C and start stirring and reacting for 150 - 200 min, and then add a phosphating agent, where the molar ratio of allyl glycidyl ether to the phosphating agent is (2.5 - 4):1, maintain the temperature and continue stirring and reacting for 60 - 90 min, and cool to obtain the modified polyether siloxane phosphate.

[0011] By adopting the above technical solution, the preparation process is simple and does not require too many complex devices, which is not only beneficial to self-preparation during subsequent use, but also beneficial to reducing the preparation cost of the modified finishing liquid.

[0012] Optionally, the fiber carding structure of the diffusion layer adopts parallel carding and is parallel to the longitudinal extension direction of the diaper; the fiber carding structure of the slow-permeation layer adopts random carding.

[0013] By adopting the above technical solution, it can effectively enable urine to quickly divert and spread along the longitudinal extension direction of the diaper when it penetrates into the diffusion layer, and enable urine to achieve uniform circumferential diffusion when it penetrates into the slow-permeation layer. Since urine has a larger longitudinal diffusion area in the diffusion layer, expanding the lateral diversion range of urine in the slow-permeation layer, it can effectively increase the diffusion area of urine within a unit time, which is beneficial to improving the diversion ability of the diversion layer.

[0014] Optionally, in the diffusion layer, the hydrophilic ES fiber is a core-sheath type PE / PP composite fiber with a fiber fineness of 1.5D - 2D after hydrophilic treatment, the fiber fineness of the PLA fiber is 1.3D - 1.5D, the fiber fineness of the modal fiber is 1.2D - 1.5D, and the fiber lengths of the hydrophilic ES fiber, the PLA fiber, and the modal fiber are all 36 - 40 mm; In the slow seepage layer, the fiber fineness of the natural cotton is 4D - 6D, and the fiber length is 40 - 60 mm.

[0015] By adopting the above technical solution, using fibers with a smaller fineness to form a diffusion layer can make the diffusion layer form uniform dense pores, which is beneficial to enhancing the capillary force, promoting the full diffusion of urine in the diffusion layer, and preventing local liquid accumulation saturation and back-seepage. In addition, using coarser natural cotton and fluff pulp to form a slow seepage layer can keep the slow seepage layer in a highly fluffy state and not easily collapse, and with the water retention capacity of both, the slow seepage layer can slow down the vertical seepage speed of urine to a certain extent, so that urine can further diffuse in the slow seepage layer. When encountering sudden large amounts of urination, the diversion layer can also fully divert and buffer, preventing local oversaturation of the absorbent core layer and resulting in urine accumulation or back-seepage.

[0016] Optionally, the surface layer and the diversion layer are composite by hot pressing and form grid grooves, the grid grooves extend along the longitudinal direction of the diaper, and raised three-dimensional diversion parts are formed between the composite and adjacent grid grooves.

[0017] By adopting the above technical solution, since the hot pressing composite process will thermally press and melt the fibers at the positions of the diffusion layer corresponding to the grid grooves, resulting in a higher fiber density at the positions of the diffusion layer corresponding to the grid grooves than that of the three-dimensional diversion parts, when urine flows through the grid grooves, it will be subject to a certain lateral damping, and at this time the urine will quickly diffuse along the three-dimensional diversion parts with less resistance, so as to cover a longer longitudinal area. In addition, although the grid grooves slow down the lateral diffusion speed of urine in the diversion layer to a certain extent, when urine seeps from the diffusion layer into the slow seepage layer, since the composition of the slow seepage layer does not contain thermally sticky fibers, the slow seepage layer will not form a lateral damping like the diffusion layer, and urine can diffuse laterally in the slow seepage layer at a normal speed. Since urine covers a longer longitudinal area in the diffusion layer, expanding the lateral diversion range of urine, it is beneficial to increase the diffusion area of urine per unit time.

[0018] Optionally, the grid grooves are wavy, adjacent grid grooves are parallel to each other, and continuous wavy three-dimensional diversion parts are formed between adjacent grid grooves.

[0019] By adopting the above technical solution, since the three-dimensional flow guiding part has a wavy structure similar to that of the grid grooves, when urine rapidly longitudinally diffuses along the three-dimensional flow guiding part with less resistance, it can achieve uniform lateral diffusion through the guidance of the wavy three-dimensional flow guiding part. This not only helps to promote the rapid diffusion of urine, but also the wavy three-dimensional flow guiding part can appropriately expand the diffusion range of urine, which is beneficial to slightly improving the utilization rate and liquid absorption efficiency of the absorbent core layer.

[0020] Optionally, the grid grooves are wavy, adjacent grid grooves are symmetrical to each other and do not intersect, and a plurality of spindle-shaped three-dimensional flow guiding parts are formed between adjacent grid grooves.

[0021] By adopting the above technical solution, since adjacent grid grooves do not intersect, the spindle-shaped three-dimensional flow guiding parts in the same column are interconnected. Urine can not only rapidly longitudinally diffuse along the interconnected three-dimensional flow guiding parts, but also the uniformly distributed three-dimensional flow guiding parts can increase the absorption specific surface area of the surface layer and the flow guiding layer, which is beneficial to improving the surface absorption efficiency of adult diapers, shortening the urine seepage time, and making the user feel more comfortable.

[0022] Optionally, the grid grooves are arc-shaped, the arc-shaped openings of the grid grooves face both sides of the diaper, and the grid grooves on both sides are symmetrically arranged along the central axis of the diaper, and arc-shaped three-dimensional flow guiding parts are formed between adjacent grid grooves.

[0023] By adopting the above technical solution, since the three-dimensional flow guiding part has an arc-shaped structure, when urine rapidly longitudinally diffuses along the three-dimensional flow guiding part with less resistance, it can achieve directional lateral diffusion through the guidance of the arc-shaped bending position of the three-dimensional flow guiding part. Therefore, it is not only beneficial to promote the rapid diffusion of urine, but also can make the urine have a larger diffusion range through directional guidance, fully utilize the absorbent core layer far from the center point for liquid absorption, and is beneficial to improving the utilization rate and liquid absorption efficiency of the absorbent core layer.

[0024] In a second aspect, a stable adult diaper provided by the present application adopts the following technical solution: A preparation method of a stable adult diaper includes the following steps: S1. Blend hydrophilic ES fibers, PLA fibers and modal fibers in proportion, and successively go through processes such as feeding, opening and carding to form a web structure, and then form a diffusion layer by hot air composite method; blend cotton fibers and fluff pulp in proportion, and successively go through processes such as feeding, opening and carding to form a web structure, and then form a slow seepage layer by needle punching composite method; lay the diffusion layer above the slow seepage layer, and perform hydroentangling composite from one side of the diffusion layer, and obtain a flow guiding layer after sufficient drying; S2. Lay the diversion layer above the surface layer, and perform hot pressing lamination on the surface layer and the diversion layer from one side of the diversion layer, and form grid grooves on the surface layer and the diversion layer through a specific hot pressing die. S3. Keep the diversion layer above the surface layer, then apply glue on both sides of the surface layer and the diversion layer, lay the absorbent core layer and the breathable bottom film in sequence, and fully dry after hot pressing to obtain a stable adult diaper.

[0025] By adopting the above technical solutions, the preparation method is simple, which is beneficial to the subsequent large-scale production in factories.

[0026] To sum up, the technical solution of the present application has at least any one of the following beneficial effects: 1. By using a diffusion layer with a composite non-woven fabric base structure and a slow seepage layer with a composite cotton core structure to form a diversion layer, and cooperating with a hydroentangling composite process using a modified finishing liquid, the fiber diversion structure of the diversion layer can be effectively improved, so that the diversion layer has higher diversion performance and anti-backflow performance, which is beneficial to preventing phenomena such as liquid accumulation, side leakage or backflow of flooding in adult diapers, and has higher liquid absorption stability.

[0027] 2. By adding nano-porous fillers to the modified finishing liquid, the diversion layer can effectively achieve other effects such as auxiliary water absorption, antibacterial and odor removal, which is beneficial to further improving the overall functional effect of the diversion layer.

[0028] 3. By using modified polyether siloxane phosphate and sodium dodecyl sulfonate as surface modifiers in the modified finishing agent, not only can the fibers in the diffusion layer and the slow seepage layer be given excellent softness, antistatic property and hydrophilicity, but also the film-forming effect of the modified finishing liquid on the surface of the diversion layer fibers can be further optimized, which is beneficial to improving the modification effect of the modified finishing liquid. Description of the Drawings

[0029] Figure 1 It is a cross-sectional view of one side edge of an existing adult diaper.

[0030] Figure 2 It is a cross-sectional view of a stable adult diaper in Embodiment 1 of the present application.

[0031] Figure 3 It is a front view of one side of the surface layer of a stable adult diaper in Embodiment 1 of the present application.

[0032] Figure 4 It is a front view of one side of the surface layer of a stable adult diaper in Embodiment 4 of the present application.

[0033] Figure 5 It is a front view of one side of the surface layer of a stable adult diaper in Embodiment 5 of the present application.

[0034] Figure 6 This is the front view of one side of the surface layer of a stable adult diaper in Comparative Example 3 of the present application.

[0035] Explanation of the reference numerals in the drawings: 1. Surface layer; 2. Diversion layer; 21. Diffusion layer; 22. Slow seepage layer; 3. Absorbent core layer; 4. Breathable bottom film; 5. Grid groove; 6. Three-dimensional diversion part. Detailed implementation manners

[0036] The present application will be further described in detail below with reference to the drawings, preparation examples, examples and comparative examples.

[0037] The terminal hydrogen-containing silicone oil is selected from the Qingfeng segment polydimethylsiloxane of Runhe Materials, with the brand number RH-H6, and the hydrogen content of this brand is 0.1% - 0.12%.

[0038] Allyl glycidyl ether is selected from Kelong Chemical Industry, with the brand number KL-11B, its relative average molecular weight is 500, and the epoxy value ≥ 0.17 eq / 100g.

[0039] The hydrophilic ES fiber and PLA fiber are both selected from Haining Xinneng Textile, the modal fiber is selected from Hangzhou Youbiao Textile, and the fluff pulp is selected from the untreated (ultra-soft) fluff pulp of International Paper Company. The specific specifications of the above fibers are customized according to requirements.

[0040] Preparation examples

Preparation Example 1-1

[0041]

Preparation Example 1-2

[0042]

Preparation Example 2-1

[0043] Among them, in this preparation example, the modified polyether siloxane phosphate is specifically selected as a modified polyether siloxane phosphate prepared in [Preparation Example 1-1], and the nanoporous filler is specifically selected as nanoporous carbon powder with a particle size of 50 nm.

[0044]

Preparation Example 2-2

[0045] Among them, in this preparation example, the modified polyether siloxane phosphate is specifically selected as a modified polyether siloxane phosphate prepared in [Preparation Example 1-2], and the nanoporous filler is specifically selected as nano-diatomite with a particle size of 100 nm.

[0046]

Preparation Example 2-3

[0047] Among them, in this preparation example, the modified polyether siloxane phosphate is specifically selected as a modified polyether siloxane phosphate prepared in [Preparation Example 1-2], and the nanoporous filler is specifically selected as nano-montmorillonite with a particle size of 100 nm. Examples

[0048]

Example 1

[0049] In this embodiment, the diffusion layer 21 is a composite non-woven fabric base structure, which is specifically composed of hydrophilic ES fibers, PLA fibers, and modal fibers that are opened, parallel carded, and then compounded. Among them, the hydrophilic ES fiber is a hydrophilic-treated core-shell PE / PP composite fiber with a fiber fineness of 1.5 D and a fiber length of 38 mm. The PLA fiber has a fiber fineness of 1.3 D and a fiber length of 36 mm, and the modal fiber has a fiber fineness of 1.2 D and a fiber length of 40 mm. The mixing mass ratio of the hydrophilic ES fiber, PLA fiber, and modal fiber is 2:7:1. In addition, the carding direction of the diffusion layer 21 is parallel to the longitudinal extension direction of the diaper.

[0050] In this embodiment, the slow-permeation layer 22 is a highly fluffy composite cotton core structure, which is specifically composed of natural cotton and fluff pulp that are opened and randomly carded and then compounded. Among them, the natural cotton has a fiber fineness of 4 D and a fiber length of 80 mm, and the fluff pulp has a fiber fineness of 20 μm and a fiber length of 5 mm. The mixing mass ratio of natural cotton and fluff pulp is 1:0.4.

[0051] A preparation method of a stable adult diaper includes the following steps: S1. Blend hydrophilic ES fibers, PLA fibers, and modal fibers in proportion, and successively pass through processes such as feeding, opening, and parallel carding to form a web structure with a thickness of 0.4 mm, and then form the diffusion layer 21 by hot air composite method; blend cotton fibers and fluff pulp in proportion, and successively pass through processes such as feeding, opening, and random carding to form a web structure with a thickness of 3 mm, and then form the slow-permeation layer 22 by needle punching composite method; lay the diffusion layer 21 above the slow-permeation layer 22, and perform hydroentangling composite from one side of the diffusion layer 21, and obtain the diversion layer 2 after sufficient drying; Among them, the liquid used for hydroentangling composite is a modified finishing liquid prepared in [Preparation Example 2-1].

[0052] S2. Lay the diversion layer 2 above the surface layer 1, perform hot pressing composite on the surface layer 1 and the diversion layer 2 from one side of the diversion layer 2, and form grid grooves 5 on the surface layer 1 and the diversion layer 2 through a specific hot pressing die; Among them, as Figure 3 shown, the grid grooves 5 are wavy, adjacent grid grooves 5 are parallel to each other, and a continuous wavy three-dimensional diversion part 6 is formed between adjacent grid grooves 5.

[0053] S3. Keep the diversion layer 2 above the surface layer 1, then apply glue on both sides of the surface layer 1 and the diversion layer 2, lay the absorption core layer 3 and the breathable bottom film 4 in sequence, and perform hot pressing and then sufficient drying to obtain a stable adult diaper.

[0054]

Example 2

[0055] In this embodiment, the diffusion layer 21 is a composite non-woven fabric base structure, and is specifically composed of hydrophilic ES fibers, PLA fibers and modal fibers after being opened, parallel carded and then compounded. Among them, the hydrophilic ES fiber is a hydrophilic-treated core-shell type PE / PP composite fiber with a fiber fineness of 2D and a fiber length of 38 mm, the PLA fiber has a fiber fineness of 1.5D and a fiber length of 36 mm, and the modal fiber has a fiber fineness of 1.2D and a fiber length of 40 mm. The mixing mass ratio of the hydrophilic ES fiber, PLA fiber and modal fiber is 3.5:6:0.5. In addition, the carding direction of the diffusion layer 21 is parallel to the longitudinal extension direction of the diaper.

[0056] In this embodiment, the slow permeation layer 22 is a highly fluffy composite cotton core structure, and is specifically composed of natural cotton and fluff pulp after being opened and randomly carded and then compounded. Among them, the natural cotton has a fiber fineness of 6D and a fiber length of 60 mm, the fluff pulp has a fiber fineness of 20μm and a fiber length of 5 mm, and the mixing mass ratio of natural cotton and fluff pulp is 1:0.8.

[0057] A preparation method of a stable adult diaper, comprising the following steps: S1. Blend the hydrophilic ES fibers, PLA fibers and modal fibers in proportion, and successively pass through processes such as feeding, opening, and parallel carding to form a web structure with a thickness of 0.4 mm, and then form the diffusion layer 21 by hot air composite method; Blend cotton fibers and fluff pulp in proportion, and successively pass through processes such as feeding, opening, and random carding to form a web structure with a thickness of 3 mm, and then form the slow permeation layer 22 by needle punching composite method; Lay the diffusion layer 21 above the slow permeation layer 22, and perform hydrospinning composite from one side of the diffusion layer 21, and obtain the diversion layer 2 after sufficient drying; Among them, the liquid used for hydrospinning composite is a modified finishing liquid prepared in [Preparation Example 2-2].

[0058] S2. Lay the diversion layer 2 above the surface layer 1, and perform hot pressing composite on the surface layer 1 and the diversion layer 2 from one side of the diversion layer 2, and make the surface layer 1 and the diversion layer 2 form grid grooves 5 through a specific hot pressing die; Among them, as Figure 3 shown, the grid grooves 5 are wavy, adjacent grid grooves 5 are parallel to each other, and a continuous wavy three-dimensional diversion part 6 is formed between adjacent grid grooves 5.

[0059] S3. Keep the diversion layer 2 above the surface layer 1, then apply glue on both sides of the surface layer 1 and the diversion layer 2, lay the absorbent core layer 3 and the breathable bottom film 4 in sequence, and fully dry after hot pressing to obtain a stable adult diaper.

[0060]

Example 3

Example 1

[0061] In step S1 of the preparation method, the liquid used for the hydrospinning composite of the diversion layer 2 is a modified finishing liquid prepared in

Preparation Example 2-3

[0062]

Example 4

Example 1

[0063] In step S2 of the preparation method, the grid groove 5 structure formed after the surface layer 1 and the diversion layer 2 are composite by hot pressing is different. Specifically, as Figure 4 shown, the grid groove 5 is wavy, adjacent grid grooves 5 are symmetrical to each other and do not intersect, and several spindle-shaped three-dimensional diversion parts 6 are formed between adjacent grid grooves 5.

[0064]

Example 5

Example 1

[0065] In step S2 of the preparation method, the grid groove 5 structure formed after the surface layer 1 and the diversion layer 2 are composite by hot pressing is different. Specifically, as Figure 5 shown, the grid groove 5 is arc-shaped, the arc-shaped opening of the grid groove 5 faces both sides of the diaper, and the grid grooves 5 on both sides are symmetrically arranged along the central axis of the diaper, and arc-shaped three-dimensional diversion parts 6 are formed between adjacent grid grooves 5.

[0066] Comparative Example

Comparative Example 1

[0067]

Comparative Example 2

Example 1

[0068] In step S1 of the preparation method, the liquid used for the hydrospinning composite of the diversion layer 2 is soft water.

[0069]

Comparative Example 3

Example 1

[0070] In step S2 of the preparation method, as Figure 6 shown, the surface layer 1 and the diversion layer 2 are compounded by hot pressing. The specific hot pressing position is around the diversion layer 2, so as to keep the middle part of the surface layer 1 and the diversion layer 2 flat, without grid grooves 5 and three-dimensional diversion parts 6.

[0071] Performance test data 1. Diversion performance test: After cutting off the elastic bands (including three-dimensional side guards) on both sides of the adult diapers prepared in each example and comparative example, place them flat on a horizontal panel with the surface layer facing up, and then fix the specimens with four stainless steel clips. The stainless steel clips shall not interfere with the flow of the solution. Then, set up a liquid outlet funnel above the center point of the absorbent core layer. The liquid intake is 60 ml, and the solution is blue physiological saline. During the test, quickly open the funnel, and quickly measure and record the longitudinal maximum length (cm) and transverse maximum length (cm) of the solution penetrating the diaper at this time 5 s after the solution has flowed out, accurate to 0.1 cm.

[0072] 2. Sliding seepage absorption performance test: Refer to A.1 and A.2 in Appendix A of "28004-2011 Diapers (Sheets, Pads)" for testing. Specifically, the effective width of the diaper to be tested (the effective width of the absorbent core layer after the diaper is laid flat) is 200 mm, the liquid intake is 150 ml, the solution is blue physiological saline, and the inclination angle is 30°. After the test, measure and record the volume (ml) of the solution not absorbed in the beaker.

[0073] 3. Anti-backflow performance test: Refer to A.3 in Appendix A of "28004-2011 Diapers (Sheets, Pads)" for testing. Specifically, the liquid intake is 150 ml, the solution is blue physiological saline, and after the test, measure and record the leakage amount (g) of each example and comparative example.

[0074] Table 1 Partial performance test data of adult diapers Combining Examples 1-3 and Comparative Example 1 and the data in Table 1, it can be seen that the adult diapers prepared by the present application using the double-layer structure diversion layer 2 compounded by the hydrospinning method have higher longitudinal and transverse diffusion speeds compared with the existing commercially available diapers, and the sliding seepage performance and anti-backflow performance are significantly improved, which is beneficial to improving the liquid absorption rate of the diaper per unit time, and thus can effectively prevent phenomena such as liquid accumulation, side leakage or backflow of soaking in the process of using the diaper.

[0075] Combining Example 1 and Comparative Example 2 and the data in Table 1, it can be seen that by using the self-made modified finishing liquid to prepare the diversion layer 2 by hydrospinning composite, compared with the traditional hydrospinning composite using soft water, the adult diaper prepared has higher longitudinal and transverse diffusion rates, and has better wicking and anti-backflow properties. This may be because in addition to adding nano-porous fillers that are beneficial for water absorption, antibacterial, and odor removal to the modified finishing liquid, surface modifiers such as modified polyether siloxane phosphate and sodium dodecyl sulfonate are additionally added. As a result, the modified finishing liquid can fully modify the surfaces of both the diffusion layer 21 and the slow-permeation layer 22 during the hydrospinning composite process. Among them, the modified polyether siloxane phosphate can not only endow the fibers in the diffusion layer 21 and the slow-permeation layer 22 with excellent softness and antistatic properties, but also the polyether chain segments can further improve the hydrophilicity of the surfaces of the fibers in the diffusion layer 21 and the slow-permeation layer 22. Thus, the diversion layer 2 can have better permeability, which is beneficial for the solution infiltrating into the diversion layer 2 to achieve rapid diffusion and penetration per unit time. In addition, sodium dodecyl sulfonate can assist the modified polyether siloxane phosphate to be uniformly dispersed in the modified finishing liquid, further optimizing its film-forming effect on the surfaces of the fibers in the diffusion layer 21 and the slow-permeation layer 22, which is beneficial for improving the modification effect of the modified finishing liquid.

[0076] Combining Example 1, Examples 4-5 and Comparative Example 3 and the data in Table 1, it can be seen that by using a specific mold to thermocompression bond the surface layer 1 and the diversion layer 2 to form specific grid grooves 5 and a three-dimensional diversion part 6 with a specific shape. Under the condition that the surface layer 1 and the absorbent core layer 3 are the same, compared with the flat surface layer 1 and the diversion layer 2 without grooves, the longitudinal diffusion rate of the solution in the diaper is significantly increased. Although the transverse diffusion rate slows down, it has a larger diffusion area in the same time.

[0077] This may be because when the grid grooves 5 are formed by thermocompression, the fiber density at the position of the diffusion layer 21 corresponding to the grid grooves 5 is larger than that of the three-dimensional diversion part 6 due to thermal bonding. As a result, the grid grooves 5 form a damping zone for the transverse diffusion of the solution in the diffusion layer 21. When the solution infiltrates into the diffusion layer 21, due to the transverse damping of the grid grooves 5 and in cooperation with the longitudinally extended fiber combing structure, the solution can quickly diffuse along the three-dimensional diversion part 6 with less resistance, so as to cover a longer longitudinal area. At this time, not only can the transverse diversion range of the solution be further expanded, but also the absorbent core layer 3 can uniformly absorb and expand along the longitudinal diffusion path, preventing local saturation absorption of the absorbent core layer 3. However, in Comparative Example 3, due to the lack of the transverse damping of the grid grooves 5, relying only on the longitudinal combing of the diffusion zone, the solution will still uniformly diffuse in all directions at a faster longitudinal and slower transverse speed. At the same time, because circular diffusion needs to overcome the resistance in all directions and the energy is dispersed over a 360° range, the diffusion rate of the solution per unit distance will be reduced and the diffusion area of the solution in the same time will be reduced.

[0078] This specific implementation manner is only an interpretation of the present application and does not limit the present application. After reading this specification, those skilled in the art can make modifications without creative contributions to this specific implementation manner as needed, but as long as it is within the scope of the claims of the present application, it is protected by the patent law.

Claims

1. A stable adult diaper, characterized in that: It comprises a surface layer (1), a guide layer (2), an absorbent core layer (3) and a breathable bottom film (4) which are arranged in sequence, wherein the guide layer (2) is formed by compounding a diffusion layer (21) and a slow seepage layer (22) by a hydroentanglement method, and the diffusion layer (21) is located on a side of the slow seepage layer (22) close to the surface layer (1); The diffusion layer (21) is a composite non-woven fabric-based structure, and is formed by opening and combing hydrophilic ES fibers, modal fibers, and PLA fibers, wherein the mass ratio of the hydrophilic ES fibers, the PLA fibers, and the modal fibers is (2-3.5): (6-7): (0.5-1); The slow permeation layer (22) is a high-fluff composite cotton core structure, and is formed by opening and combing natural cotton and fluff pulp, wherein the mass ratio of the cotton fiber to the fluff pulp is 1:(0.4-0.8); The liquid used in the water-jet composite of the guide layer (2) is a modified finishing liquid, which is prepared by mixing soft water, a surfactant and a nanoporous filler.

2. A stable adult diaper according to claim 1, characterized in that: The modified finishing liquid is prepared by mixing the following raw materials in parts by weight: Soft water: 100 parts; Modified polyether siloxane phosphate: 12-20 parts; Sodium dodecyl sulfate: 3-8 parts; Nanoporous filler: 10-15 parts; Wherein, the nanoporous filler is at least one of nanoporous carbon powder, nano-montmorillonite and nano-diatomaceous earth.

3. A stable adult diaper according to claim 2, characterized in that: The preparation method of the modified polyether siloxane phosphate comprises the following steps: The terminal hydrogen-containing silicone oil and allyl glycidyl ether are preliminarily mixed, a platinum catalyst is added, and then heated to 65-72°C and stirred for reaction for 150-200 minutes, and then a phosphating agent is added, wherein the molar ratio of allyl glycidyl ether to the phosphating agent is (2.5-4):1, the temperature is maintained and the stirring reaction is continued for 60-90 minutes, and the modified polyether siloxane phosphate is obtained after cooling.

4. A stable adult diaper according to claim 1, characterized in that: The fiber combing structure of the diffusion layer (21) adopts parallel combing and is parallel to the longitudinal extension direction of the diaper; the fiber combing structure of the slow permeation layer (22) adopts random combing.

5. The stable adult diaper according to claim 1, characterized in that: In the diffusion layer (21), the hydrophilic ES fiber is a hydrophilic treated core-skin PE / PP composite fiber with a fiber fineness of 1.5D-2D, the fiber fineness of the PLA fiber is 1.3D-1.5D, the fiber fineness of the modal fiber is 1.2D-1.5D, and the fiber lengths of the hydrophilic ES fiber, the PLA fiber, and the modal fiber are all 36-40 mm. In the slow seepage layer (22), the fiber fineness of the natural cotton is 4D-6D, and the fiber length is 40-60 mm.

6. A stable adult diaper according to claim 1, characterized in that: The surface layer (1) and the guide layer (2) are composited by hot pressing to form grid grooves (5), the grid grooves (5) extending in the longitudinal direction of the diaper, and raised three-dimensional guide portions (6) are formed between the composite and adjacent grid grooves (5).

7. A stable adult diaper according to claim 6, characterized in that: The grid grooves (5) are wavy in shape, adjacent grid grooves (5) are parallel to each other, and continuous wavy three-dimensional flow guide portions (6) are formed between adjacent grid grooves (5).

8. A stable adult diaper according to claim 6, characterized in that: The grid grooves (5) are wavy in shape, adjacent grid grooves (5) are symmetrical to each other and do not intersect each other, and a plurality of spindle-shaped three-dimensional flow guide portions (6) are formed between adjacent grid grooves (5).

9. The stable adult diaper according to claim 6, characterized in that: The grid grooves (5) are arc-shaped, the arc-shaped openings of the grid grooves (5) are oriented toward two sides of the diaper, and the grid grooves (5) on both sides are symmetrically arranged along the central axis of the diaper, and arc-shaped three-dimensional guide portions (6) are formed between adjacent grid grooves (5).

10. A method for preparing a stable adult diaper, used for preparing a stable adult diaper according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1, blending hydrophilic ES fiber, PLA fiber and modal fiber in proportion, and sequentially subjecting them to processes such as feeding, opening and combing to form a web structure, and then compounding them by hot air method to form a diffusion layer (21); blending cotton fiber and fluff pulp in proportion, and sequentially subjecting them to processes such as feeding, opening and combing to form a web structure, and then compounding them by needle punching method to form a slow seepage layer (22); laying the diffusion layer (21) on top of the slow seepage layer (22), and performing hydroentanglement compounding from one side of the diffusion layer (21), and obtaining a guide layer (2) after sufficient drying; S2, laying the guide layer (2) on the surface layer (1), performing hot pressing on the surface layer (1) and the guide layer (2) from one side of the guide layer (2), and forming grid grooves (5) on the surface layer (1) and the guide layer (2) by a hot pressing mold; S3, keeping the guide layer (2) above the surface layer (1), then applying glue on both sides of the surface layer (1) and the guide layer (2), laying the absorbent core layer (3) and the breathable bottom film (4) in sequence, hot pressing and fully drying, to obtain a stable adult diaper.

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