Preparation of special hot-melt self-adhesive fiber for hygienic materials

Abstract

The invention discloses a preparation method of a hot-melt self-adhesive fiber special for hygienic materials, and relates to the technical field of fibers. Modified polyurethane and nano activated carbon are used as a skin layer, low-melting-point polyester particles are used as a core layer, melt spinning is carried out through a spinning assembly with triangular spraying holes, and the mechanical strength of the fiber is improved; then the filaments firstly pass through an air layer and then are introduced into a cooling bath, so that liquid crystal macromolecules are in a highly-ordered frozen liquid crystal state, and the tensile strength of the fibers is improved; drafting is conducted through a hot drafting machine, intermolecular acting force is increased, and the tensile strength of the fibers is enhanced; and finally, drying and cutting off to obtain the special hot-melting self-adhesive fiber for the hygienic material. The modified polyurethane is prepared from L-lysine diisocyanate, 2, 3-dihydroxy propyl-trimethyl ammonium chloride and diethanolamine-D4 through condensation polymerization, the hydrophobic performance of the fiber is enhanced, the antibacterial effect is achieved, and meanwhile the modified polyurethane can be mutually neutralized with acidic components in peculiar smell substances to achieve the deodorization effect.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fibers, in particular to the preparation of hot melt self-bonding fibers special for hygiene materials. BACKGROUND

[0002] Non-woven technology is a new field in the textile technology. Compared with traditional weaving, non-woven technology has the advantages of short process flow, high yield, wide raw material sources, various product types, wide application range, etc. In recent years, it has been developing at a high speed. At the same time, with the increasing attention of people to hygiene materials, the demand for hygiene products such as masks and medical protective clothing has increased sharply. The demand for hot melt self-bonding fibers for hygiene materials has also increased due to their good loftiness, elasticity and air and moisture permeability. Developing hot melt self-bonding fibers special for hygiene materials meets the market demand and conforms to the development trend of the industry.

[0003] To achieve high strength, the traditional hot melt self-bonding fibers special for hygiene materials usually focus on the selection of the main fiber material and the optimization of the processing technology. High-strength polymer matrices are usually selected. However, the chemical structure of these high-strength polymers is relatively stable, which is not conducive to the introduction of active groups or components with antibacterial and deodorizing functions. The current mainstream method is to load substances with antibacterial properties onto the fibers. Common methods include attaching nano-silver particles to the surface of the fibers by physical adsorption or chemical bonding, or using quaternary ammonium salt antibacterial agents for coating treatment. However, these operations change the surface energy and chemical environment of the fibers. The introduction of antibacterial agents increases the surface roughness of the fibers and changes the hydrophilicity. In the subsequent hot melt self-bonding process, the bonding effect between the fibers is poor, and the ideal bonding strength cannot be achieved, which affects the overall structural stability of the hygiene materials. SUMMARY

[0004] The present application aims to provide a preparation method of hot melt self-bonding fibers special for hygiene materials to solve the problems in the prior art.

[0005] To solve the above technical problems, the present application provides the following technical scheme: a preparation method of hot melt self-bonding fibers special for hygiene materials, comprising the following preparation steps:

[0006] (1) uniformly mix 1 part of a prepolymer, 24-50 parts of L-lysine diisocyanate, 11-19 parts of 2,3-dihydroxypropyl-trimethylammonium chloride, 14-26 parts of diethanolamine-D4, and 1-3 parts of a chain extender, keep at 90℃ for 30-50 min under a vacuum degree of-0.06 to-0.02 MPa, cool to 70-80℃, add 0.02-0.04 parts of dibutyltin dilaurate, and react for 3-5 h under stirring at 100 rpm, and then stand for 30-50 min under a vacuum degree of-0.08 to-0.1 MPa to obtain a modified polyurethane;

[0007] (2) mixing 55-75 parts of modified polyurethane, 2-4 parts of lubricant, 6-14 parts of nano activated carbon with a particle size of 10 nm uniformly, extruding and cutting by a mixing machine to prepare a sheath layer raw material;

[0008] (3) placing the sheath layer raw material and the core layer raw material in corresponding troughs, respectively, melting and spinning at different temperatures, drawing to a water solution 30 cm away from the nozzle for 5-15 min, and then taking out to prepare a composite monofilament;

[0009] (4) drawing the composite monofilament into a hot drawing machine, drawing to 0.8-3.2 times at 80-100 ℃, placing in a drying room at 30-40 ℃ for 6-24 h, and then cutting to prepare a hot melt self-adhesive fiber special for hygiene materials.

[0010] Further, the preparation step of the prepolymer in step (1) is: keeping 5-13 parts of diethanolamine-D4 at a vacuum degree of -0.06 to -0.02 MPa and 100 ℃ for 30-50 min, cooling to room temperature, adding 12-26 parts of L-lysine diisocyanate and 4-10 parts of 2,3-dihydroxypropyl-trimethylammonium chloride, and reacting at 70-80 ℃ under stirring at 80 rpm for 1-2 h, and then naturally cooling to room temperature to prepare the prepolymer.

[0011] Further, the chain extender in step (1) is any one or a mixture of multiple of 1,4-butanediol, ethylene glycol and ethylenediamine.

[0012] Further, the lubricant in step (2) is any one of oleic acid amide and butyl stearate.

[0013] Further, the parameters of the mixing machine in step (2) are: a material head temperature of 180-200 ℃, a screw rotation speed of 160-190 r / min, an extrusion pressure of 8-14 MPa, and a shearing rate of 150-220 s -1 .

[0014] Further, the core layer raw material in step (3) is polyethylene terephthalate particles with a melting point of 120-150 ℃.

[0015] Further, the different temperatures in step (3) are a core layer spinning screw temperature of 130-160 ℃ and a sheath layer spinning screw temperature of 180-220 ℃.

[0016] Further, the conditions of the melt spinning in step (3) are: a triangular-shaped hole spinneret plate is used, a spinning pressure is 5-15 MPa, and a spinning speed is 1000-2000 m / min.

[0017] Further, the winding speed of the drawing machine in step (4) is 1200-2400 m / min.

[0018] Further, the diameter of the special hot-melt self-adhesive fiber for sanitary materials is 10-30 microns.

[0019] Compared with the prior art, the present application has the following advantages:

[0020] The present application first uses modified polyurethane and nano activated carbon as the skin layer, low-melting polyester particles as the core layer, and a triangular-shaped jet orifice spinning assembly for melt spinning. When the fiber is impacted by external force, the skin layer can absorb part of the energy through its own deformation, and at the same time, the remaining energy is transmitted to the core layer, further dissipating the energy to prevent fiber breakage, thereby achieving high strength. On this basis, the triangular geometry enables it to better resist deformation when subjected to bending external forces, thereby enhancing the mechanical strength of the fiber. Then the yarn is first passed through an air layer, at which point the high molecules are in a liquid crystal state, improving internal stress and enhancing tensile strength. Then it is introduced into a cooling bath, causing the liquid crystal macromolecules to be in a highly ordered frozen liquid crystal state, with the macromolecules being more closely arranged, thereby enhancing the intermolecular interaction force and further improving the tensile strength of the fiber. Then it is stretched by a hot drawing machine, and the molecular chains are regularly arranged under the action of the drawing force, more amorphous regions are converted into crystalline regions, the crystallinity is increased, the intermolecular force is increased, and the tensile strength of the fiber is further enhanced. Finally, drying and cutting are performed to achieve the effects of antibacterial, deodorization and high strength.

[0021] The modified polyurethane is prepared by polycondensation reaction of L-lysine diisocyanate, 2,3-dihydroxypropyl-trimethylammonium chloride and diethanolamine-D4. The long-chain ester group introduced by L-lysine diisocyanate enhances the hydrophobic properties of the fiber, effectively preventing liquid with bacteria from adhering to the surface, thereby achieving antibacterial effect. 2,3-dihydroxypropyl-trimethylammonium chloride can destroy the structure of bacteria to achieve antibacterial performance, and at the same time, can perform ion exchange with nano activated carbon to improve the dispersion effect of activated carbon in the fiber skin layer, and the amino group in diethanolamine-D4 can neutralize the acidic components in odor substances to form neutral substances, thereby reducing the intensity of odor and achieving deodorization effect. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present application will be clearly and completely described below in combination with the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0023] In order to more clearly illustrate the method provided by the present application, the following embodiments are described in detail. In the following embodiments, the test methods of various indexes of the special hot-melt self-adhesive fiber for sanitary materials are as follows:

[0024] Tensile strength: the same weight of examples and comparative examples was taken, and tensile test was carried out according to GB / T 16603-2017, and the tensile rate was 10 mm / min.

[0025] Bacteriostatic rate: the same weight of examples and comparative examples was taken, and the same specification of composite fiber non-woven fabric (400 g / m 2 ) was prepared by the same process (hot rolling process), and the test was carried out according to GB / T 20944.3.

[0026] Deodorization performance test method: the same weight of examples and comparative examples was taken, and was sprayed into a closed container with a known odor (H2S, NH3) concentration C0, and was placed for 60 min, and then the odor (H2S, NH3) concentration C1 in the closed instrument was tested by detection instrument, and the odor removal rate (%) = (C0-C1) / C0 was calculated, wherein C0 was the initial concentration of odor (H2S, NH3) in the closed container, and C1 was the concentration of odor (H2S, NH3) in the closed container after adding the antibacterial and deodorizing functional fiber.

[0027] Example 1: (1) 5 parts of diethanolamine-D4 were kept at a vacuum degree of-0.06 MPa and 100°C for 30 min, cooled to room temperature, 12 parts of L-lysine diisocyanate, 4 parts of 2,3-dihydroxypropyl-trimethylammonium chloride were added, and reacted at 70°C under stirring at 80 rpm for 1 h, and naturally cooled to room temperature to prepare a prepolymer;

[0028] (2) 1 part of the prepolymer, 24 parts of L-lysine diisocyanate, 11 parts of 2,3-dihydroxypropyl-trimethylammonium chloride, 14 parts of diethanolamine-D4, and 1 part of 1,4-butanediol were uniformly mixed, kept at a vacuum degree of-0.06 MPa and 90°C for 30 min, cooled to 70°C, 0.02 parts of dibutyltin dilaurate was added, reacted at 100 rpm for 3 h, and kept at a vacuum degree of-0.08 MPa for 30 min to prepare a modified polyurethane;

[0029] (3) 55 parts of the modified polyurethane, 2 parts of oleic acid amide, and 6 parts of nano activated carbon with a particle size of 10 nm were uniformly mixed, and the material head temperature was 180°C, the screw rotation speed was 160 r / min, the extrusion pressure was 8 MPa, and the shear rate was 150 s -1 , to prepare a skin layer raw material;

[0030] (4) The skin layer raw material and polyethylene terephthalate particles with a melting point of 120°C were placed in the corresponding hopper, and the composite filaments were prepared by melt spinning with a triangular-shaped orifice spinneret as the jet orifice, a jet spinning pressure of 5 MPa, a spinning speed of 1000 m / min, and drawing into an aqueous solution 30 cm away from the jet orifice for 5 min, and then taken out;

[0031] (5) The composite filaments were drawn into a hot-drawing machine with a winding speed of 1200 m / min, and drawn to 0.8 times at 80°C, and then placed in a drying room at 30°C for 6 h, and then cut to obtain the hot melt self-adhesive fiber for sanitary materials; the diameter of the hot melt self-adhesive fiber for sanitary materials was 10 μm.

[0032] Example 2: (1) 9 parts of diethanolamine-D4 were kept at a vacuum degree of -0.04 MPa and 100°C for 40 min, cooled to room temperature, and then 19 parts of L-lysine diisocyanate, 7 parts of 2,3-dihydroxypropyl-trimethylammonium chloride were added, and reacted at 75°C under stirring at 80 rpm for 1.5 h, and then naturally cooled to room temperature to obtain a prepolymer;

[0033] (2) 1 part of the prepolymer, 37 parts of L-lysine diisocyanate, 15 parts of 2,3-dihydroxypropyl-trimethylammonium chloride, 20 parts of diethanolamine-D4, and 2 parts of ethylene glycol were uniformly mixed, kept at a vacuum degree of -0.04 MPa and 90°C for 40 min, cooled to 75°C, and then 0.03 parts of dibutyltin dilaurate was added, and reacted under stirring at 100 rpm for 4 h, and then kept at a vacuum degree of -0.09 MPa for 40 min to obtain a modified polyurethane;

[0034] (3) 65 parts of the modified polyurethane, 3 parts of butyl stearate, and 10 parts of nano-activated carbon with a particle size of 10 nm were uniformly mixed, and then extruded and cut by a mixer to obtain a skin layer raw material, with a material head temperature of 190°C, a screw rotation speed of 175 r / min, an extrusion pressure of 11 MPa, and a shear rate of 185 s -1

[0035] (4) The skin layer raw material and polyethylene terephthalate particles with a melting point of 135°C were placed in the corresponding hopper, and the composite filaments were prepared by melt spinning with a triangular-shaped orifice spinneret as the jet orifice, a jet spinning pressure of 10 MPa, a spinning speed of 1500 m / min, and drawing into an aqueous solution 30 cm away from the jet orifice for 10 min, and then taken out;

[0036] ​(5) The composite monofilament is drawn into a thermal drawing machine with a winding speed of 1800 m / min, drawn to 2.0 times at 90°C, dried at 35°C for 15 h, and cut to obtain the sanitary material special hot melt self-adhesive fiber; the diameter of the sanitary material special hot melt self-adhesive fiber is 20 μm.

[0037] Example 3: (1) 13 parts of diethanolamine-D4 are kept at a vacuum degree of -0.02 MPa and 100°C for 50 min, cooled to room temperature, 26 parts of L-lysine diisocyanate, 10 parts of 2,3-dihydroxypropyl-trimethylammonium chloride are added, and reacted at 80°C under stirring at 80 rpm for 2 h, and naturally cooled to room temperature to obtain a prepolymer;

[0038] (2) 1 part of the prepolymer, 50 parts of L-lysine diisocyanate, 19 parts of 2,3-dihydroxypropyl-trimethylammonium chloride, 26 parts of diethanolamine-D4, and 3 parts of ethylenediamine are uniformly mixed, kept at a vacuum degree of -0.02 MPa and 90°C for 50 min, cooled to 80°C, 0.04 parts of dibutyltin dilaurate is added, and reacted at 100 rpm for 5 h, and kept at a vacuum degree of -0.1 MPa for 50 min to obtain a modified polyurethane;

[0039] (3) 75 parts of the modified polyurethane, 4 parts of oleic acid amide, and 14 parts of nano activated carbon with a particle size of 10 nm are uniformly mixed, and extruded and cut by a mixer to obtain a sheath raw material, with a material head temperature of 200°C, a screw rotation speed of 190 r / min, an extrusion pressure of 14 MPa, and a shear rate of 220 s -1 ;

[0040] (4) The sheath raw material and polyethylene terephthalate particles with a melting point of 150°C are respectively placed in corresponding grooves, and melt blown with a triangular special-shaped hole spinneret as a jet hole, a spinning pressure of 15 MPa, and a spinning speed of 2000 m / min at a core layer spinning screw temperature of 160°C and a sheath spinning screw temperature of 220°C, and drawn into an aqueous solution 30 cm away from the jet hole and kept for 15 min, and then taken out to obtain a composite monofilament;

[0041] (5) The composite monofilament is drawn into a thermal drawing machine with a winding speed of 2400 m / min, drawn to 3.2 times at 100°C, dried at 40°C for 24 h, and cut to obtain the sanitary material special hot melt self-adhesive fiber; the diameter of the sanitary material special hot melt self-adhesive fiber is 30 μm.

[0042] Comparative Example 1: The difference between Comparative Example 1 and Example 2 is that no nano activated carbon is added. The remaining steps are the same as those of Example 2.

[0043] Comparative Example 2: The difference between Comparative Example 2 and Example 2 is that there is no core layer. The remaining steps are the same as those of Example 2.

[0044] Comparative Example 3: The difference between Comparative Example 3 and Example 2 is that the spinneret is directly immersed in the aqueous solution. The remaining steps are the same as Example 2.

[0045] Comparative Example 4: The difference between Comparative Example 4 and Example 2 is that the aqueous solution is not introduced and the stretching step is directly performed. The remaining steps are the same as Example 2.

[0046] Comparative Example 5: The difference between Comparative Example 5 and Example 2 is that L-lysine diisocyanate is not added during the preparation of the prepolymer and the modified polyurethane. The remaining steps are the same as in Example 2.

[0047] Comparative Example 6: The difference between Comparative Example 6 and Example 2 is that 2,3-dihydroxypropyl-trimethylammonium chloride is not added during the preparation of the prepolymer and the modified polyurethane. The remaining steps are the same as in Example 2.

[0048] Comparative Example 7: The difference between Comparative Example 7 and Example 2 is that diethanolamine-D4 is not added during the preparation of the prepolymer and the modified polyurethane. The remaining steps are the same as in Example 2.

[0049] Comparative Example 8: The difference between Comparative Example 8 and Example 2 is that the hot stretching step is not performed, and the product is directly dried after being removed from the aqueous solution. The remaining steps are the same as those of Example 2.

[0050] Effect Examples

[0051] Table 1 below shows the performance analysis results of the hot-melt self-adhesive fibers for sanitary materials using Examples 1 to 3 of the present invention and Comparative Examples 1 to 8.

[0052] Table 1

[0053] Tensile strength / MPa Bacteriostatic rate / % [NH3 removal rate / %] H2S removal rate / %<!-- 4 --> Example 1 86.5 99.9 95.8 75.9 Example 2 88.1 99.9 96.1 76.1 Example 3 87.8 99.9 96.0 76.2 Comparative Example 1 80.6 99.7 87.2 68.4 Comparative Example 2 70.3 99.5 94.4 73.8 Comparative Example 3 72.4 99.6 94.7 73.6 Comparative Example 4 72.8 99.4 93.6 72.7 Comparative Example 5 81.2 87.6 90.3 71.5 Comparative Example 6 80.1 80.2 91.9 69.8 Comparative Example 7 79.5 98.8 81.2 60.3 Comparative Example 8 69.9 99.5 92.5 73.4

[0054] From the experimental data comparison of examples 1, 2, 3 and comparative examples 1, 5, 6, 7, it can be found that the modified polyurethane prepared by polycondensation reaction of L-lysine diisocyanate, 2, 3-dihydroxypropyl-trimethylammonium chloride and diethanolamine-D4 introduces long chain ester groups, enhances the hydrophobic properties of the fiber, effectively avoids the adhesion of liquid with bacteria on the surface, realizes the antibacterial effect, and cooperates with 2, 3-dihydroxypropyl-trimethylammonium chloride to destroy the structure of bacteria, realizes the antibacterial performance, at the same time, can carry out ion exchange with nano activated carbon, improve the dispersion effect of activated carbon in the fiber skin layer, assist the amino group in diethanolamine-D4 to neutralize the acidic components in odor substances, form neutral substances, thereby reducing the intensity of odor, achieving the deodorization effect; From the experimental data comparison of examples 1, 2, 3 and comparative example 2, it can be found that the modified polyurethane and nano activated carbon are used as the skin layer, the low-melting-point polyester particles are used as the core layer, and the melt spinning is carried out by using the triangular-shaped spinneret assembly, when the fiber is impacted by external force, the skin layer can absorb part of the energy through its own deformation, and at the same time, the remaining energy is transmitted to the core layer, further dissipating the energy, preventing the fiber from breaking, realizing the effect of high strength, and cooperating with the triangular geometry to better resist deformation when subjected to bending external force, enhancing the mechanical strength of the fiber; From the experimental data comparison of examples 1, 2, 3 and comparative examples 3, 4, it can be found that the yarn is first introduced into the air layer, at this time the polymer is in a liquid crystal state, improving the internal stress and enhancing the tensile strength, and then introduced into the cooling bath, so that the liquid crystal macromolecules are in a highly ordered frozen liquid crystal state, the macromolecular arrangement is more compact, the intermolecular interaction force is enhanced, and the tensile strength of the fiber is improved; From the experimental data comparison of examples 1, 2, 3 and comparative example 8, it can be found that when the fiber is stretched by the heat drawing machine, the molecular chains are regularly arranged under the action of the drawing force, more amorphous regions are converted into crystalline regions, the crystallinity is increased, the intermolecular force is increased, and the tensile strength of the fiber is enhanced.

[0055] It is obvious to those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, but can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be considered in all aspects as exemplary and non-limiting, and the scope of the present application is defined by the appended claims rather than the above description, and it is intended to encompass all changes falling within the meaning and scope of the equivalent elements of the claims. Any mark in the claims should not be considered as limiting the involved claims.

Claims

1. A method for preparing hot-melt self-adhesive fibers for sanitary materials, characterized in that: The method comprises the following preparation steps: (1) 1 part of prepolymer, 24-50 parts of L-lysine diisocyanate, 11-19 parts of 2,3-dihydroxypropyl-trimethylammonium chloride, 14-26 parts of diethanolamine-D4, and 1-3 parts of chain extender are mixed uniformly, maintained at 90°C for 30-50 minutes under a vacuum degree of -0.06 to -0.02 MPa, cooled to 70-80°C, added with 0.02-0.04 parts of dibutyltin dilaurate, reacted for 3-5 hours under stirring at 100 rpm, and allowed to stand for 30-50 minutes under a vacuum degree of -0.08 to -0.1 MPa to obtain a modified polyurethane; (2) 55-75 parts of modified polyurethane, 2-4 parts of lubricant, and 6-14 parts of nano-activated carbon with a particle size of 10 nm are mixed uniformly, and the mixture is extruded and pelletized in a mixer to obtain a raw material for the skin layer; (3) placing the skin layer raw material and the core layer raw material in corresponding troughs, melting and spinning at different temperatures, pulling them into an aqueous solution 30 cm away from the nozzle and letting them stand for 5 to 15 minutes, then fishing them out to obtain composite monofilaments; (4) The composite monofilament is drawn into a hot drawing machine, drawn to 0.8 to 3.2 times at 80 to 100° C., dried at 30 to 40° C. for 6 to 24 hours, and cut to obtain a hot-melt self-adhesive fiber for sanitary materials.

2. The method for preparing a hot-melt self-adhesive fiber for sanitary materials according to claim 1, characterized in that: The preparation steps of the prepolymer in step (1) are as follows: 5 to 13 parts of diethanolamine-D4 are maintained at 100°C for 30 to 50 minutes under a vacuum degree of -0.06 to -0.02 MPa, cooled to room temperature, 12 to 26 parts of L-lysine diisocyanate and 4 to 10 parts of 2,3-dihydroxypropyl-trimethylammonium chloride are added, and the mixture is reacted at 70 to 80°C and 80 rpm under stirring for 1 to 2 hours, and naturally cooled to room temperature to obtain a prepolymer.

3. The method for preparing a hot-melt self-adhesive fiber for sanitary materials according to claim 1, characterized in that: The chain extender in step (1) is a mixture of any one or more of 1,4-butanediol, ethylene glycol, and ethylenediamine.

4. The method for preparing a hot-melt self-adhesive fiber for sanitary materials according to claim 1, characterized in that: The lubricant in step (2) is any one of oleamide and butyl stearate.

5. The method for preparing a hot-melt self-adhesive fiber for sanitary materials according to claim 1, characterized in that: The parameters of the mixer in step (2) are: head temperature of 180-200°C, screw speed of 160-190 r / min, extrusion pressure of 8-14 MPa, shear rate of 150-220 s -1 .

6. The method for preparing a hot-melt self-adhesive fiber for sanitary materials according to claim 1, characterized in that: The core layer raw material in step (3) is polyethylene terephthalate particles with a melting point of 120 to 150°C.

7. The method for preparing a special hot-melt self-adhesive fiber for sanitary materials according to claim 1, characterized in that: The different temperatures in step (3) are 130-160°C for the core layer spinning screw and 180-220°C for the skin layer spinning screw.

8. The method for preparing a hot-melt self-adhesive fiber for sanitary materials according to claim 1, characterized in that: The conditions for the melt spinning in step (3) are: a triangular-shaped spinneret with a spinning hole, a spinning pressure of 5 to 15 MPa, and a spinning speed of 1000 to 2000 m / min.

9. The method for preparing a hot-melt self-adhesive fiber for sanitary materials according to claim 1, characterized in that: The winding speed of the drawing machine in step (4) is 1200 to 2400 m / min.

10. The method for preparing a special hot-melt self-adhesive fiber for sanitary materials according to claim 1, characterized in that: The diameter of the special hot-melt self-adhesive fiber for sanitary materials is 10 to 30 μm.