Leakage-proof partition edge, telescopic paper diaper and telescopic pull-ups

Abstract

The invention discloses a leakage-proof partition edge, a telescopic paper diaper and a telescopic pull-ups. The leakage-proof partition edge is a composite layer of non-woven fabric, a telescopic film and non-woven fabric; the telescopic film is prepared from the following components in parts by weight: 50 to 60 parts of PTFE (Polytetrafluoroethylene) resin, 18 to 25 parts of filler and 0.5 to 1.2 parts of lubricant; the filler is a hydrophobic modified filler modified by a silane coupling agent. The leakage-proof partition edges have good telescopic performance, high water vapor permeability and hydrostatic pressure resistance, and good ventilation and leakage-proof effects are achieved. Furthermore, the invention further provides a paper diaper and pull-ups based on the leakage-proof partition edge, and a main body of the paper diaper and pull-ups comprises a surface layer, a core body, a bottom film and a bottom layer which are sequentially arranged from top to bottom; the core body comprises a composite core body and a fluff pulp core body, one end, far away from the fluff pulp core body, of the composite core body is fixedly connected with the bottom film, and one end, far away from the composite core body, of the fluff pulp core body is fixedly connected with the bottom film; or a plurality of V-shaped grooves are formed in the surface of the composite core body along the length direction of the core body.

Description

Technical Field

[0001] The present invention belongs to the technical field of nursing products, and more specifically, relates to a leak-proof partition edge and a retractable diaper and pull-up pants. Background Art

[0002] Diapers and pull-up pants are disposable products that can be discarded after one-time use. Compared with traditional diapers, they are more convenient and hygienic, and are increasingly loved by young parents. Diapers are generally made of non-woven fabrics, toilet paper, fluff pulp, polymer absorbent resin, PE film, rubber bands and other materials. Diapers and pull-up pants have certain requirements for stretchability because they are worn on active infants and young children.

[0003] The diaper includes a main body including an absorbent core, a front waist ring, a rear waist ring, and leak-proof edges, etc. Although the front waist ring, the rear waist ring, and the leak-proof edges can be extended and retracted by elastic rubber bands, such as a patent for a comfortable two-piece diaper discloses that a hollow inflatable elastic spacer is arranged in the circumference of the waist to achieve the extension effect, the main structure including the core is still of a fixed length, and there are still few solutions for the extension and retraction of the main structure of diapers.

[0004] The patent "A highly moisture-permeable polyolefin microporous breathable film" has achieved anti-leakage and good air permeability, but it only pursues a small basis weight, and it does not improve the stretching effect; the patent "A method for preparing a composite film composed of a non-woven fabric and a breathable film" uses a composite non-woven fabric to increase the tension and improve the stretching performance, but the process of rolling glue-type non-woven composite breathable film has defects, and the glue will block the micropores of the breathable film, thereby reducing the air permeability. In addition, the existing leak-proof partition edge is not stretchable, and during the stretching process of the core body, the leak-proof partition edge will also be deformed, thereby destroying the internal structure of the leak-proof partition edge, and then causing the liquid to be absorbed to leak from the side of the partition edge, and a good waterproof effect cannot be achieved. Therefore, how to provide a diaper that can be stretched and has excellent waterproof effect has become a technical problem that needs to be solved urgently. Summary of the invention

[0005] In view of the above existing technical problems, the primary purpose of the present invention is to provide a leak-proof partition.

[0006] A second object of the present invention is to provide a stretchable diaper.

[0007] The third object of the present invention is to provide a stretchable pull-up pants.

[0008] In order to achieve the above object, the present invention is implemented by the following technical solutions:

[0009] A leakproof separator, which is a composite layer of non-woven fabric, a stretch film and non-woven fabric; the stretch film comprises, by weight: 50 to 60 parts of PTFE resin, 18 to 25 parts of filler, and 0.5 to 1.2 parts of lubricant; the filler is a hydrophobic modified filler modified by a silane coupling agent.

[0010] The inventors found through research that when the diaper is stretched, the partition edge is not stretchable, which will cause the partition edge to deform, and then the liquid to be absorbed will leak from the partition edge, and a good waterproof effect cannot be achieved. Therefore, the inventors heat-pressed a layer of stretch film between the elastic non-woven fabrics. The stretch film uses PTFE resin as the base resin, and the prepared film has excellent stretchability and can cooperate with the core part to stretch; in addition, the hydrophobic modified filler helps to improve the air permeability and water resistance of the stretch film, further improving the waterproof and breathable effect of the partition edge.

[0011] Preferably, the hydrophobically modified filler includes hydrophobically modified nano calcium carbonate and / or hydrophobically modified nano silicon dioxide.

[0012] Preferably, the mass ratio of the hydrophobically modified nano-calcium carbonate to the hydrophobically modified nano-silicon dioxide is 1 to 2: 1 to 2. Further preferably, the mass ratio of the hydrophobically modified nano-calcium carbonate to the hydrophobically modified nano-silicon dioxide is 1:1.

[0013] Preferably, the silane coupling agent is selected from one or more of dihydro-3-[3-(trimethoxysilyl)propyl]furan-2,5-dione, 3-(2,3-glycidoxypropyl)triethoxysilane, γ-aminopropyltriethoxysilane or 3-mercaptopropyltriethoxysilane.

[0014] Preferably, the hydrophobically modified filler can be prepared by a conventional hydrophobic modification method in the art. More specifically, in some embodiments, the hydrophobically modified filler is prepared by mixing a filler, a silane coupling agent and a solvent, standing overnight, and drying to obtain the hydrophobically modified filler.

[0015] Preferably, the mass ratio of the filler to the silane coupling agent is 1:1 to 5. Further preferably, the mass ratio of the filler to the silane coupling agent is 1:1 to 3. More preferably, the mass ratio of the filler to the silane coupling agent is 1:1 to 2.

[0016] Preferably, the average particle size of the hydrophobically modified nano-calcium carbonate is 1000-2000 mesh.

[0017] Preferably, the average particle size of the hydrophobically modified nano-silica is 1000-2000 mesh.

[0018] Preferably, the lubricant may be a lubricant commonly used in the art. More specifically, the lubricant includes but is not limited to lubricating oil and the like.

[0019] Preferably, the stretch film comprises, by weight: 53 to 58 parts of PTFE resin, 20 to 24 parts of filler, and 0.8 to 1.0 parts of lubricant.

[0020] Preferably, in the leak-proof partition, the non-woven fabric, the stretch film and the non-woven fabric are composited by heat pressing.

[0021] In some embodiments, the present invention provides a method for preparing a stretch film, which specifically comprises the following steps:

[0022] (1) mixing PTFE resin, filler and lubricant, extruding and granulating to prepare film particles;

[0023] (2) the film layer particles in step (1) are extruded through a casting extruder to form a film blank;

[0024] (3) In step (2), the film blank is longitudinally stretched, the longitudinal stretching temperature is controlled to be 200-250°C, and the longitudinal stretching ratio is 5-10:1; then, it is transversely stretched, the transverse stretching temperature is controlled to be 130-200°C, and the transverse stretching ratio is 25-40:1; after stretching, it is heat-set to obtain a stretch film.

[0025] The inventors have found through research that when the longitudinal stretch ratio and transverse stretch ratio of the stretch film are controlled within a specific range, the direction and degree of molecular chain orientation in the composite breathable film of the PTFE system can be further optimized, the isotropy can be improved, the formation of a complex cross-linked network can be reduced, and the heat shrinkage rate in both the longitudinal and transverse directions can be higher, while the cross-linked structure of the PTFE resin can be improved. Thus, excellent stretching effect and breathability effect can be achieved at the same time.

[0026] In some embodiments, the present invention provides a method for preparing a leakproof partition, which specifically includes the following steps: laminating a non-woven fabric on both sides of a stretch film by hot pressing to prepare a leakproof partition.

[0027] Preferably, in step (1), the temperature of extrusion granulation is 200-250°C.

[0028] Preferably, in step (2), the extrusion is performed through a casting extruder at 160-180°C.

[0029] Preferably, in step (3), heat setting treatment is performed at 250-280°C.

[0030] Furthermore, the present invention provides a retractable diaper, comprising a main body, a front waist ring, a rear waist ring and the above-mentioned leakproof partition edge; one end of the main body is connected to the front waist ring, and the other end is connected to the rear waist ring, and the leakproof partition edge is arranged on both sides of the main body.

[0031] The main body comprises a surface layer, a core body, a bottom film and a bottom layer arranged in sequence from top to bottom;

[0032] The core body comprises a composite core body and a fluff pulp core body, one end of the composite core body away from the fluff pulp core body is fixedly connected to the base film, and one end of the fluff pulp core body away from the composite core body is fixedly connected to the base film, and when the base film is stretched along the length direction of the core body, the composite core body and the fluff pulp core body move in opposite directions; or

[0033] The core body comprises a composite core body, and a plurality of V-shaped grooves are provided on the surface of the composite core body along the length direction of the core body.

[0034] The present invention provides a composite core and a fluff pulp core in the core part, one end of the composite core away from the fluff pulp core is fixedly connected to the bottom film, and the other end is not connected to the bottom film; one end of the fluff pulp core away from the composite core is fixedly connected to the bottom film, and the other end is not connected to the bottom film. When the diaper is stretched along its length, the bottom film will stretch along the length direction of the core, and the composite core and the fluff pulp core with one end fixedly connected to the bottom film will stretch along the length direction with the bottom film, thereby realizing the retractability of the diaper.

[0035] More specifically, the composite core has a 5-layer structure, which includes dust-free paper, super absorbent resin, fluffy non-woven fabric, super absorbent resin and dust-free paper from top to bottom. More specifically, the super absorbent resin can be a polymer absorbent resin conventionally used in the art, including but not limited to Sanya 930, Sumitomo 60S, etc.

[0036] In addition, the present invention also provides another stretchable core structure, in which the surface of the composite core is provided with a plurality of V-shaped grooves along the length direction of the core. When the diaper is stretched along its length direction, the design of the V-shaped grooves will make the composite core follow the stretching in the length direction of the diaper, thereby achieving a stretchable effect. In addition, since the grooves in the core may have a certain impact on the absorption of liquid by the core, the design of the V-shaped grooves in the present application is relative to other grooves (such as transverse rectangular grooves, etc.), and in the process of stretching and retracting, the shape of the V-shaped grooves after stretching is more conducive to the absorption of liquid, and can reduce the impact on the core structure to a lesser extent, thereby avoiding affecting the absorption of liquid.

[0037] Preferably, the composite core and the fluff pulp core are in contact with each other. Furthermore, the composite core and the fluff pulp core are overlapped in the vertical direction.

[0038] Preferably, the number of the V-shaped grooves is 3 to 10. More preferably, the number of the V-shaped grooves is 4 to 6.

[0039] Preferably, the surface layer is an elastic non-woven fabric surface layer. More specifically, the elastic non-woven fabric surface layer can be a perforated elastic non-woven fabric surface layer. When the core is stretched, the elastic non-woven fabric surface layer can cooperate with the core to stretch; in addition, the elastic non-woven fabric is perforated, which can improve the stretching rate on the one hand; on the other hand, it can also allow urine and the like to quickly penetrate to keep the surface layer dry, further improving the comfort of infants and young children.

[0040] Preferably, the surface layer has a grammage of 16 to 25 g / m2.

[0041] Preferably, the base film is selected from cast POE (polyolefin elastomer) film or PTFE film.

[0042] Preferably, the bottom layer is an elastic nonwoven bottom layer. More specifically, the elastic nonwoven bottom layer can be a perforated elastic nonwoven bottom layer.

[0043] Preferably, the rear waist ring is an elastic waist, and adhesive tapes are provided at both ends of the rear waist ring; and the front waist ring is provided with a front waist tape in contact with the adhesive tapes at a position corresponding to the adhesive tapes of the rear waist ring.

[0044] Furthermore, the present invention seeks to protect a stretchable pull-up pants, comprising a main body, a waistline portion and the above-mentioned leak-proof partition edge; the main body is connected to the waistline portion, and the leak-proof partition edge is arranged on both sides of the main body.

[0045] The main body comprises a surface layer, a core body, a bottom film and a bottom layer arranged in sequence from top to bottom;

[0046] The core body comprises a composite core body and a fluff pulp core body, one end of the composite core body away from the fluff pulp core body is fixedly connected to the base film, and one end of the fluff pulp core body away from the composite core body is fixedly connected to the base film, and when the base film is stretched along the length direction of the core body, the composite core body and the fluff pulp core body move in opposite directions; or

[0047] The core body comprises a composite core body, and a plurality of V-shaped grooves are provided on the surface of the composite core body along the length direction of the core body.

[0048] Compared with the prior art, the present invention has the following beneficial effects:

[0049] The present invention provides a leakproof edge, and a diaper and a pull-up pants prepared based on the leakproof edge. By setting a core body retractable structure and optimizing the leakproof edge, the main body of the diaper has good retractability, and the leakproof edge can be retracted in coordination with the core body. In addition, the leakproof edge also has a high water vapor permeability and hydrostatic pressure resistance, and has good air permeability and anti-leakage effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 This is a schematic structural diagram of the main body of the stretchable diaper of Example 1.

[0051] Figure 2 This is a schematic structural diagram of the main body of the stretchable diaper of Example 6.

[0052] Figure 3 This is a top view of the composite core in Example 6.

[0053] Among them, 1-surface layer, 2-fluff pulp core, 3-composite core, 31-V-shaped groove, 4-bottom film, 5-bottom layer. DETAILED DESCRIPTION

[0054] The present invention is further described below in conjunction with the specification and specific examples, but the examples do not limit the present invention in any form. Unless otherwise specified, the reagents, methods and equipment used in the present invention are conventional reagents, methods and equipment in the art.

[0055] Embodiment 1 A stretchable diaper

[0056] A retractable diaper comprises a main body, a front waist ring, a rear waist ring, and leak-proof edges, wherein one end of the main body is connected to the front waist ring, and the other end is connected to the rear waist ring, and the leak-proof edges are arranged on both sides of the main body.

[0057] The main body includes a surface layer 1, a core body, a bottom film 4 and a bottom layer 5 which are arranged in sequence from top to bottom; the core body includes a composite core body 3 and a fluff pulp core body 2; one end of the composite core body 3 away from the fluff pulp core body 2 is fixedly connected to the bottom film 4, and one end of the fluff pulp core 2 away from the composite core body 3 is fixedly connected to the bottom film 4, and when the bottom film 4 is stretched along the length direction, the composite core body 3 and the fluff pulp core 2 move in opposite directions.

[0058] In this embodiment, the composite core 3 has a five-layer structure, which includes, from top to bottom, dust-free paper, highly absorbent resin Sandaya 930, fluffy non-woven fabric, highly absorbent resin Sumitomo 60S and dust-free paper.

[0059] In this embodiment, the leakproof partition is a composite layer of non-woven fabric, stretch film and non-woven fabric.

[0060] The stretch film comprises, by weight: 55 parts of PTFE resin (DISP 40LX, DuPont), 10 parts of hydrophobically modified nano calcium carbonate, 10 parts of hydrophobically modified nano silicon dioxide, and 1.0 part of lubricating oil.

[0061] In this embodiment, the surface layer is a perforated elastic non-woven fabric surface layer, the bottom film is a cast POE film, and the bottom layer is a perforated elastic non-woven fabric bottom layer.

[0062] In this embodiment, the preparation method of hydrophobically modified nano-calcium carbonate is: nano-calcium carbonate, dihydro-3-[3-(trimethoxysilyl)propyl]furan-2,5-dione and toluene are mixed (the mass ratio of nano-calcium carbonate and dihydro-3-[3-(trimethoxysilyl)propyl]furan-2,5-dione is 1:2), left to stand overnight, and dried to obtain hydrophobically modified nano-calcium carbonate. The preparation of hydrophobically modified nano-silicon dioxide refers to the preparation of the above-mentioned hydrophobically modified nano-calcium carbonate.

[0063] In this embodiment, the method for preparing the above-mentioned stretch film specifically includes the following steps:

[0064] (1) mixing PTFE resin, filler and lubricant, and extruding and granulating at 220° C. to prepare film particles;

[0065] (2) the film layer particles in step (1) are extruded through a casting extruder at 170° C., and the melt is extruded through the die lip gap of the T-die head of the casting machine to form a film blank;

[0066] (3) In step (2), the film blank is longitudinally stretched, the longitudinal stretching temperature is controlled to be 220° C., and the longitudinal stretching ratio is 5:1; then, the film blank is transversely stretched, the transverse stretching temperature is controlled to be 150° C., and the transverse stretching ratio is 25:1; after stretching, the film blank is heat-set at 260° C. to obtain a stretch film;

[0067] (4) The non-woven fabric is laminated on both sides of the stretch film by hot pressing to prepare a leak-proof partition.

[0068] Embodiment 2 A stretchable diaper

[0069] The difference between this embodiment and embodiment 1 is that in the method for preparing the stretch film, the longitudinal stretching ratio is 8:1; and the transverse stretching ratio is 40:1.

[0070] Embodiment 3 A stretchable diaper

[0071] The difference between this embodiment and embodiment 1 is that in the method for preparing the stretch film, the longitudinal stretching ratio is 10:1; and the transverse stretching ratio is 35:1.

[0072] Example 4: A stretchable diaper

[0073] The difference between this embodiment and embodiment 1 is that, by weight, the stretch film comprises: 55 parts of PTFE resin, 20 parts of hydrophobically modified nano-calcium carbonate, and 1.0 part of lubricating oil.

[0074] Example 5: A stretchable diaper

[0075] The difference between this embodiment and embodiment 1 is that, by weight, the stretch film comprises: 55 parts of PTFE resin, 20 parts of hydrophobically modified nano-silicon dioxide, and 1.0 part of lubricating oil.

[0076] Example 6: A stretchable diaper

[0077] The difference between this embodiment and the first embodiment is that the core body comprises a composite core body 3 , and the surface of the composite core body 3 is provided with six V-shaped grooves 31 along the length direction of the core body.

[0078] Comparative Example 1

[0079] The difference between this comparative example and Example 1 is that in the method for preparing the stretch film, the longitudinal stretching ratio is 6:1; and the transverse stretching ratio is 65:1.

[0080] Comparative Example 2

[0081] The difference between this comparative example and Example 1 is that in the preparation method of the stretch film, the longitudinal stretching ratio is 2:1; and the transverse stretching ratio is 28:1.

[0082] Comparative Example 3

[0083] The difference between this comparative example and Example 1 is that, by weight, the stretch film comprises: 55 parts of PTFE resin, 10 parts of nano-calcium carbonate, 10 parts of nano-silicon dioxide, and 1.0 part of lubricating oil.

[0084] Test Case

[0085] The performance tests were conducted on the leakproof partitions prepared in the examples of the present invention and the comparative examples, wherein the elongation at break was measured according to GB / T 1040-1992, the tensile speed was 50 mm / min, and the test results were averaged for 5 times. The water vapor transmission rate was tested according to GB / T1037. The hydrostatic pressure resistance was tested according to GB / T 4744. The test results are shown in Table 1 below.

[0086] Table 1

[0087] Example 1 Example 2 Example 3 Example 4 Example 5 Comparative Example 1 Comparative Example 2 Comparative Example 3 Elongation at break, % 25.4 26.5 25.8 21.3 22.1 19.8 19.5 25.0 <![CDATA[WVTR,g / m 2 *24h]]> 7880 7920 7820 7210 7280 6840 6804 7280 <![CDATA[Hydrostatic pressure resistance, mmH2O]]> 754 742 751 697 704 678 672 692

[0088] It can be seen from the above examples that the leak-proof partition prepared by the present invention has good elongation at break, water vapor permeability and hydrostatic pressure resistance.

[0089] It can be seen from Example 1, Comparative Example 1 and Comparative Example 2 that when the longitudinal stretch ratio and the transverse stretch ratio are within a specific range, the leakproof separator prepared has a more excellent elongation at break, water vapor permeability and hydrostatic pressure resistance. It can be seen from Example 1 and Comparative Example 3 that when nano-calcium carbonate and nano-silicon dioxide are hydrophobically modified, the leakproof separator prepared has a more excellent water vapor permeability and hydrostatic pressure resistance.

[0090] The foregoing examples are merely illustrative and are used to explain some features of the method of the present invention. The appended claims are intended to require the widest possible range that can be imagined, and the embodiments presented herein are demonstrated by the applicant's actual test results. Therefore, the applicant's intention is that the appended claims are not limited by the selection of examples that illustrate the features of the present invention. Some numerical ranges used in the claims also include sub-ranges therein, and changes in these ranges should also be interpreted as being covered by the appended claims where possible.

Claims

1. A leakproof partition, characterized in that: The leakproof partition is a composite layer of non-woven fabric, a stretch film and non-woven fabric; the stretch film comprises, by weight: 50 to 60 parts of PTFE resin, 18 to 25 parts of filler, and 0.5 to 1.2 parts of lubricant; the filler is a hydrophobic modified filler modified by a silane coupling agent.

2. The leakproof partition according to claim 1, characterized in that: The hydrophobically modified filler includes hydrophobically modified nano calcium carbonate and / or hydrophobically modified silicon dioxide.

3. The leakproof partition according to claim 2, characterized in that: The mass ratio of the hydrophobically modified nano calcium carbonate to the hydrophobically modified silicon dioxide is 1-2:1-2.

4. The leakproof partition according to claim 2, characterized in that: The average particle size of the hydrophobically modified nano calcium carbonate is 1000-2000 meshes; the average particle size of the hydrophobically modified silicon dioxide is 1000-2000 meshes.

5. The leakproof partition according to claim 1, characterized in that: The silane coupling agent is selected from one or more of dihydro-3-[3-(trimethoxysilyl)propyl]furan-2,5-dione, 3-(2,3-glycidoxypropyl)triethoxysilane, γ-aminopropyltriethoxysilane or 3-mercaptopropyltriethoxysilane.

6. The leakproof partition according to claim 1, characterized in that: The preparation method of the stretch film comprises the following steps: (1) mixing PTFE resin, filler and lubricant, extruding and granulating to prepare film particles; (2) the film layer particles in step (1) are extruded through a casting extruder to form a film blank; (3) In step (2), the film blank is longitudinally stretched, the longitudinal stretching temperature is controlled to be 200-250°C, and the longitudinal stretching ratio is 5-10:1; then, it is transversely stretched, the transverse stretching temperature is controlled to be 130-200°C, and the transverse stretching ratio is 25-40:1; after stretching, it is heat-set to obtain a stretch film.

7. A stretchable diaper, comprising a main body, a front waist ring, a rear waist ring and the leak-proof partition edge according to any one of claims 1 to 6; one end of the main body is connected to the front waist ring, and the other end is connected to the rear waist ring, and the leak-proof partition edge is arranged on both sides of the main body, characterized in that: The main body comprises a surface layer, a core body, a bottom film and a bottom layer arranged in sequence from top to bottom; The core body comprises a composite core body and a fluff pulp core body, one end of the composite core body away from the fluff pulp core body is fixedly connected to the base film, and one end of the fluff pulp core body away from the composite core body is fixedly connected to the base film, and when the base film is stretched along the length direction of the core body, the composite core body and the fluff pulp core body move in opposite directions; or The core body comprises a composite core body, and a plurality of V-shaped grooves are provided on the surface of the composite core body along the length direction of the core body.

8. The diaper according to claim 7, characterized in that: The composite core body and the fluff pulp core body are in abutment with each other.

9. The diaper according to claim 7, characterized in that: The surface layer is an elastic non-woven fabric surface layer; the bottom film is selected from a cast POE film or a PTFE film; and the bottom layer is an elastic non-woven fabric bottom layer.

10. A stretchable pull-up pants, comprising a main body, a waistline portion and the leak-proof partition edge according to any one of claims 1 to 6, wherein the main body is connected to the waistline portion, and the leak-proof partition edge is arranged on both sides of the main body, characterized in that: The main body comprises a surface layer, a core body, a bottom film and a bottom layer arranged in sequence from top to bottom; The core body comprises a composite core body and a fluff pulp core body, one end of the composite core body away from the fluff pulp core body is fixedly connected to the base film, and one end of the fluff pulp core body away from the composite core body is fixedly connected to the base film, and when the base film is stretched along the length direction of the core body, the composite core body and the fluff pulp core body move in opposite directions; or The core body comprises a composite core body, and a plurality of V-shaped grooves are provided on the surface of the composite core body along the length direction of the core body.

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