Small-diameter cotton sliver and preparation method thereof

Abstract

The invention discloses a small-diameter cotton sliver and a preparation method thereof, and belongs to the technical field of hygienic products. Firstly, modified cotton fibers are carded, stacked, shaped and cut to obtain cotton fiber layers, then non-woven fabric is adopted for wrapping and pressing, then the strip-shaped fiber layers are sewn, fixed and curled into small-diameter cylinders through sewing threads, and the small-diameter cylinders are pressed, formed, compressed and loaded into a guide pipe to obtain the small-diameter cotton sliver. The present invention relates to a small-diameter tampon which can better help low-menstrual-volume women, green hands or sensitive users to smoothly transition to the use of tampons, improving the overall quality of their menstrual life, and which also has a better ability to absorb and secure menstrual blood, despite a reduced diameter, ensures that the tampon still has good ability to absorb and secure menstrual blood, and thus makes it possible to improve the overall quality of their menstrual life. The problem that a small-size cotton sliver possibly has insufficient absorption performance is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of sanitary products, and in particular to a small-diameter tampon and a preparation method thereof. Background Art

[0002] In recent years, with rising health awareness and changing lifestyles among women, demand for tampons, a menstrual care product that replaces traditional sanitary napkins, has steadily grown in both domestic and international markets. Compared to sanitary napkins, tampons offer significant advantages such as portability, comfort, reduced leakage, and ease of use during exercise. Consequently, an increasing number of women are choosing to use tampons during their menstrual period, particularly for special occasions such as swimming, fitness, and travel.

[0003] However, the mainstream tampons currently on the market are mostly developed with a standard diameter (14-18mm), mainly for women with normal menstrual blood flow. This standardized design ignores the needs of some special groups. For example, women with low menstrual flow, adolescent girls experiencing menarche, unmarried women, or people who need small-diameter tampons due to medical needs (such as postpartum recovery period, high vaginal sensitivity, etc.) may experience insertion difficulties, obvious foreign body sensation, or even pain and discomfort when using conventional tampons due to the tampon's large diameter. In addition, for users who try to use tampons for the first time, overly thick tampons can easily cause tension, anxiety, and psychological resistance, thereby affecting their experience and acceptance of the product.

[0004] In practice, even so-called "mini" tampons still have relatively large diameters, failing to fully meet the needs of ultra-low flow and those with extremely high comfort requirements. Therefore, developing a tampon with a smaller diameter, smoother insertion, improved comfort, and excellent absorbency and safety can not only fill the market gap, but also better help women with low menstrual flow, new users, or those with sensitive periods to smoothly transition to tampon use, thereby improving their overall quality of life during menstruation. Summary of the Invention

[0005] The main purpose of the present invention is to propose a small-diameter tampon that can better help women with low menstrual flow, novices or sensitive users to smoothly transition to the use of tampons and improve their overall quality of menstrual life. The small-diameter tampon also has a good ability to absorb and fix menstrual blood.

[0006] To achieve the above object, the present invention provides a small-diameter tampon, and a preparation method thereof comprises the following steps:

[0007] S1, combing the modified cotton fibers, laying them into a single layer of cotton fibers after combing, then stacking and compounding the single layers of cotton fibers, and then cutting them to prepare a cotton fiber layer, wrapping the cotton fiber layer with a non-woven fabric, and then pressing them into a strip-shaped fiber layer;

[0008] S2. Fix the sewing thread at the center of the strip fiber layer, with the tail end of the sewing thread exposed 10-20 cm outside the strip fiber layer, and then curl the sewn strip fiber layer to form a small-diameter cylinder; then press the small-diameter cylinder into shape in a former and perform microwave heating treatment to obtain the tampon body; finally, compress the tampon body into a catheter to obtain a small-diameter tampon.

[0009] Preferably, the weight of the single layer of cotton fiber in step S1 is 12-16 g / m 2 The cotton fiber layer has a gram weight of 120-200 g / m 2 .

[0010] Preferably, the sizes of the small-diameter slivers in step S2 are as follows: the outer diameter of the R code is 10-12 mm, the outer diameter of the S code is 12-15 mm, and the outer diameter of the SP code is 14-17 mm.

[0011] Preferably, the temperature of the microwave heating in step S2 is 50-65° C., and the time of the microwave heating is 2-8 s.

[0012] Preferably, the method for preparing the modified cotton fiber comprises the following steps:

[0013] (1) placing cotton fibers in a sodium hydroxide aqueous solution for immersion, taking them out after immersion, washing and drying them, and then dispersing them in water, adding epichlorohydrin and polyetheramine thereto, stirring and reacting them, separating the cotton fibers after the reaction is completed, washing and drying them, and obtaining pretreated cotton fibers;

[0014] (2) dispersing sepiolite in water, then adding silver nitrate aqueous solution and stirring evenly, adding NaOH aqueous solution and stirring, and then transferring to a high-pressure reactor for hydrothermal reaction; after the reaction is completed, cooling and filtering, collecting the solid, washing, drying, calcining, and grinding to obtain a composite powder; adding the composite powder and dopamine to a Tris-HCl aqueous solution, mixing, and reacting in an open container with ultrasonic stirring at room temperature, and centrifuging, washing, and drying the reaction product to obtain a polydopamine-modified composite powder;

[0015] (3) Aqueous polyurethane, sodium lauryl sulfate, pentaerythritol glycidyl ether, triethylamine, and water are stirred and mixed uniformly, and then polydopamine-modified composite powder is added and ultrasonically treated to obtain a mixed slurry; pretreated cotton fibers are placed in the mixed slurry, heated and impregnated, and after impregnation, the cotton fibers are separated, washed with water, and then dried to obtain modified cotton fibers.

[0016] Preferably, in step (1), the mass ratio of cotton fiber, epichlorohydrin, and polyetheramine is 5-10:3-5:6-8; the stirring reaction temperature is 50-60° C., and the reaction time is 2-4 h.

[0017] Preferably, in step (2), the mass ratio of sepiolite to silver nitrate aqueous solution is 7-15:50-100; the hydrothermal reaction temperature is 160-200° C., and the reaction time is 8-10 h; and the mass ratio of the composite powder to dopamine is 1:3-5.

[0018] Preferably, in step (3), the mass ratio of aqueous polyurethane, sodium lauryl sulfate, pentaerythritol glycidyl ether, triethylamine, water, polydopamine-modified composite powder, and pretreated cotton fiber is 2-3:2-5:0.5-1.5:0.5-1:100-150:4-6:12-22; the heating and impregnation temperature is 30-50°C, and the impregnation time is 3-5h.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1) The present invention provides a small-diameter tampon and a preparation method thereof. First, modified cotton fibers are combed, stacked, shaped, and cut to obtain a cotton fiber layer. The fibers are then wrapped and pressed with a non-woven fabric. The strip-shaped fiber layer is then sewn and fixed with sewing thread and curled into a small-diameter cylinder. The small-diameter cylinder is then pressed and molded into a catheter to obtain a small-diameter tampon. The design of the small-diameter tampon can better help women with low menstrual flow, novices, or sensitive users to smoothly transition to the use of tampons, thereby improving their overall quality of life during menstruation. The small-diameter tampon also has a good ability to absorb and fix menstrual blood. Although the diameter is reduced, the tampon still has a good ability to absorb and fix menstrual blood, thereby overcoming the problem of insufficient absorption performance that may exist in small-sized tampons.

[0021] 2) The present invention treats cotton fibers with an aqueous sodium hydroxide solution to remove natural impurities in the cotton fibers, thereby expanding the internal pore structure of the fibers, improving moisture absorption and moisture conduction capabilities, and exposing more active sites. Polyetheramine is then grafted onto the cotton fibers under the action of epichlorohydrin. The long polyether chain segments of the polyetheramine can effectively improve the softness of the cotton fibers, while the intertwining of the long side chains helps to further form a void structure, enhancing the capillary absorption of the cotton fibers, thereby improving the absorption efficiency, storage, and fixation properties of blood.

[0022] 3) The present invention uses porous sepiolite to load silver oxide. On the one hand, the silver oxide particles can be evenly dispersed on the surface and in the pores of the sepiolite, effectively preventing particle agglomeration and facilitating the improvement of the antibacterial properties of the cotton fiber. On the other hand, the high specific surface area and abundant pores of the sepiolite can efficiently absorb and store liquids, thereby improving the absorption and fixation of menstrual blood. By in situ polymerizing polydopamine on the surface of the composite powder, the polydopamine molecule contains a large number of hydrophilic groups, amino and hydroxyl groups, which further improves the cotton fiber's ability to absorb menstrual blood.

[0023] 4) The present invention uses a mixed slurry to treat the modified cotton fiber, and pentaerythritol glycidyl ether can undergo a cross-linking reaction with the amino group, hydroxyl group and modified graphene oxide on the cotton fiber, thereby improving the bonding strength between the composite powder and the cotton fiber, enabling the composite powder to be firmly attached to the cotton fiber, and further improving the antibacterial and blood absorption and fixation capabilities of the modified cotton fiber. DETAILED DESCRIPTION

[0024] To avoid redundancy, the items used in the following examples are all commercially available products unless otherwise specified, and the methods used are all conventional methods unless otherwise specified.

[0025] The sources of some raw materials used in the present invention are as follows:

[0026] Polyetheramine, D400, was purchased from Shanghai MacLean Biochemical Technology Co., Ltd.

[0027] Waterborne polyurethane, brand Leasys 3250, was purchased from Shizhong Mingzhi Chemical (Shanghai) Co., Ltd.

[0028] Sepiolite, 400 μm, was purchased from Neixiang Xinglei Sepiolite Co., Ltd.

[0029] Example 1

[0030] A small-diameter tampon and a preparation method thereof, comprising the following steps:

[0031] S1. Comb the modified cotton fibers and lay them into a 14g / m 2 The single layer of cotton fiber is then stacked, composited and shaped, and then cut to obtain a single layer of cotton fiber with a gram weight of 178g / m 2 The cotton fiber layer is wrapped with a non-woven fabric and then pressed into a strip-shaped fiber layer;

[0032] S2. Fix the sewing thread at the center of the strip fiber layer, with the tail end of the sewing thread exposed 16 cm outside the strip fiber layer, and then curl the sewn strip fiber layer to form a small-diameter cylinder; then press the small-diameter cylinder into shape in a former and perform microwave heating treatment at a microwave heating temperature of 60°C and a heating time of 5 seconds to obtain the tampon body; finally, compress the tampon body into a catheter to obtain a small-diameter tampon with an outer diameter of 11 mm.

[0033] The preparation method of the modified cotton fiber comprises the following steps:

[0034] (1) 78 g of cotton fiber was immersed in 200 mL of 2 mol / L sodium hydroxide aqueous solution for 2.5 h. After the immersion was completed, the fiber was taken out, washed and dried, and then dispersed in 200 mL of water. 40.2 g of epichlorohydrin and 69.8 g of polyetheramine were added thereto. The mixture was stirred and reacted at 60 ° C for 3 h. After the reaction was completed, the cotton fiber was separated, washed and dried to obtain pretreated cotton fiber.

[0035] (2) 20 g of sepiolite was dispersed in 200 mL of water, and then 160 g of a 2 mol / L silver nitrate aqueous solution was added and mixed and stirred evenly, and 20 mL of a 2 mol / L NaOH aqueous solution was added and mixed, and then the mixture was transferred to a high-pressure reactor for hydrothermal reaction at a temperature of 200 ° C and a reaction time of 10 h. After the reaction was completed, the mixture was cooled and filtered, and the solid matter was collected, washed, dried, and calcined at 700 ° C for 2 h, and ground to obtain a composite powder. 10 g of the composite powder and 40 g of dopamine were added to 300 mL of Tris-HCl aqueous solution and mixed, and the mixture was ultrasonically stirred in an open container at room temperature for 2 h. The reaction product was centrifuged, washed, and dried to obtain a polydopamine-modified composite powder.

[0036] (3) 2.5 g of aqueous polyurethane, 3 g of sodium lauryl sulfate, 1 g of pentaerythritol glycidyl ether, 0.8 g of triethylamine, and 120 g of water were stirred and mixed evenly, and then 5 g of polydopamine-modified composite powder was added and ultrasonically treated to obtain a mixed slurry; 18 g of pretreated cotton fiber was placed in the mixed slurry, heated and immersed at 40°C for 4 h. After the immersion was completed, the cotton fiber was separated, washed with water, and then dried to obtain modified cotton fiber.

[0037] Example 2

[0038] A small-diameter tampon and a preparation method thereof, comprising the following steps:

[0039] S1. Comb the modified cotton fibers and lay them into a 12g / m 2 The single layer of cotton fiber is then stacked, composited and shaped, and then cut to obtain a gram weight of 120g / m 2The cotton fiber layer is wrapped with a non-woven fabric and then pressed into a strip-shaped fiber layer;

[0040] S2. Fix the sewing thread at the center of the strip fiber layer, with the tail end of the sewing thread exposed 10 cm outside the strip fiber layer, and then curl the sewn strip fiber layer to form a small-diameter cylinder; then press the small-diameter cylinder into shape in a former and perform microwave heating treatment at a microwave heating temperature of 50°C and a heating time of 8 seconds to obtain the tampon body; finally, compress the tampon body into a catheter to obtain a small-diameter tampon with an outer diameter of 12 mm.

[0041] The preparation method of the modified cotton fiber comprises the following steps:

[0042] (1) 50 g of cotton fiber was immersed in 200 mL of 2 mol / L sodium hydroxide aqueous solution for 2.5 h. After the immersion was completed, the fiber was taken out, washed and dried, and then dispersed in 200 mL of water. 30.5 g of epichlorohydrin and 60 g of polyetheramine were added thereto. The mixture was stirred at 50 ° C. for 4 h. After the reaction was completed, the cotton fiber was separated, washed and dried to obtain the pretreated cotton fiber.

[0043] (2) 14 g of sepiolite was dispersed in 200 mL of water, and then 100 g of a 2 mol / L silver nitrate aqueous solution was added and mixed and stirred evenly, and 10 mL of a 2 mol / L NaOH aqueous solution was added and mixed, and then the mixture was transferred to a high-pressure reactor for hydrothermal reaction at a temperature of 180 ° C and a reaction time of 10 h. After the reaction was completed, the mixture was cooled and filtered, and the solid matter was collected, washed, dried, and calcined at 700 ° C for 2 h, and ground to obtain a composite powder. 10 g of the composite powder and 30 g of dopamine were added to 300 mL of Tris-HCl aqueous solution and mixed, and the mixture was ultrasonically stirred in an open container at room temperature for 2 h. The reaction product was centrifuged, washed, and dried to obtain a polydopamine-modified composite powder.

[0044] (3) 2 g of aqueous polyurethane, 2 g of sodium lauryl sulfate, 0.5 g of pentaerythritol glycidyl ether, 0.5 g of triethylamine, and 100 g of water were stirred and mixed uniformly, and then 4 g of polydopamine-modified composite powder was added and ultrasonically treated to obtain a mixed slurry; 12 g of pretreated cotton fiber was placed in the mixed slurry, heated and immersed at 40°C for 4 h. After the immersion was completed, the cotton fiber was separated, washed with water, and then dried to obtain modified cotton fiber.

[0045] Example 3

[0046] A small-diameter tampon and a preparation method thereof, comprising the following steps:

[0047] S1. Comb the modified cotton fibers and lay them into a 16g / m 2The single layer of cotton fiber is then stacked, composited and shaped, and then cut to obtain a 200g / m 2 The cotton fiber layer is wrapped with a non-woven fabric and then pressed into a strip-shaped fiber layer;

[0048] S2. Fix the sewing thread at the center of the strip fiber layer, with the tail end of the sewing thread exposed 20 cm outside the strip fiber layer, and then curl the sewn strip fiber layer to form a small-diameter cylinder; then press the small-diameter cylinder into shape in a former and perform microwave heating treatment at a microwave heating temperature of 65°C and a heating time of 2s to obtain the tampon body; finally, compress the tampon body into a catheter to obtain a small-diameter tampon with an outer diameter of 10 mm.

[0049] The preparation method of the modified cotton fiber comprises the following steps:

[0050] (1) 100 g of cotton fiber was immersed in 200 mL of 2 mol / L sodium hydroxide aqueous solution for 2.5 h. After the immersion was completed, the fiber was taken out, washed and dried, and then dispersed in 200 mL of water. 50 g of epichlorohydrin and 80 g of polyetheramine were added thereto. The mixture was stirred and reacted at 60 ° C for 4 h. After the reaction was completed, the cotton fiber was separated, washed and dried to obtain the pretreated cotton fiber.

[0051] (2) 15 g of sepiolite was dispersed in 200 mL of water, and then 100 g of a 2 mol / L silver nitrate aqueous solution was added and mixed and stirred evenly, and 10 mL of a 2 mol / L NaOH aqueous solution was added and mixed, and then the mixture was transferred to a high-pressure reactor for hydrothermal reaction at a temperature of 200 ° C and a reaction time of 10 h. After the reaction was completed, the mixture was cooled and filtered, and the solid matter was collected, washed, dried, and calcined at 700 ° C for 2 h, and ground to obtain a composite powder. 10 g of the composite powder and 50 g of dopamine were added to 300 mL of Tris-HCl aqueous solution and mixed, and the mixture was ultrasonically stirred in an open container at room temperature for 2 h. The reaction product was centrifuged, washed, and dried to obtain a polydopamine-modified composite powder.

[0052] (3) 3 g of aqueous polyurethane, 5 g of sodium lauryl sulfate, 1 g of pentaerythritol glycidyl ether, 1 g of triethylamine, and 150 g of water were stirred and mixed evenly, and then 6 g of polydopamine-modified composite powder was added and ultrasonically treated to obtain a mixed slurry; 22 g of pretreated cotton fiber was placed in the mixed slurry, heated and immersed at 40°C for 4 h. After the immersion was completed, the cotton fiber was separated, washed with water, and then dried to obtain modified cotton fiber.

[0053] Comparative Example 1

[0054] A small-diameter tampon and a preparation method thereof, comprising the following steps:

[0055] S1. Comb the modified cotton fibers and lay them into a 14g / m 2 The single layer of cotton fiber is then stacked, composited and shaped, and then cut to obtain a single layer of cotton fiber with a gram weight of 178g / m 2 The cotton fiber layer is wrapped with a non-woven fabric and then pressed into a strip-shaped fiber layer;

[0056] S2. Fix the sewing thread at the center of the strip fiber layer, with the tail end of the sewing thread exposed 16 cm outside the strip fiber layer, and then curl the sewn strip fiber layer to form a small-diameter cylinder; then press the small-diameter cylinder into shape in a former and perform microwave heating treatment at a microwave heating temperature of 60°C and a heating time of 5 seconds to obtain the tampon body; finally, compress the tampon body into a catheter to obtain a small-diameter tampon with an outer diameter of 11 mm.

[0057] The preparation method of the modified cotton fiber is similar to that of Example 1, except that the composite powder is not modified with polydopamine, and specifically comprises the following steps:

[0058] (1) 78 g of cotton fiber was immersed in 200 mL of 2 mol / L sodium hydroxide aqueous solution for 2.5 h. After the immersion was completed, the fiber was taken out, washed and dried, and then dispersed in 200 mL of water. 40.2 g of epichlorohydrin and 69.8 g of polyetheramine were added thereto. The mixture was stirred and reacted at 60 ° C for 3 h. After the reaction was completed, the cotton fiber was separated, washed and dried to obtain pretreated cotton fiber.

[0059] (2) 20 g of sepiolite was dispersed in 200 mL of water, and then 160 g of a 2 mol / L silver nitrate aqueous solution was added and mixed and stirred uniformly. 20 mL of a 2 mol / L NaOH aqueous solution was added and mixed, and then the mixture was transferred into a high-pressure reactor for a hydrothermal reaction at a temperature of 200° C. for 10 h. After the reaction was completed, the mixture was cooled and filtered, and the solid was collected, washed, dried, and calcined at 700° C. for 2 h, and ground to obtain a composite powder.

[0060] (3) 2.5 g of aqueous polyurethane, 3 g of sodium lauryl sulfate, 1 g of pentaerythritol glycidyl ether, 0.8 g of triethylamine, and 120 g of water were stirred and mixed evenly, and then 5 g of the composite powder was added and ultrasonically treated to obtain a mixed slurry; 18 g of pretreated cotton fiber was placed in the mixed slurry, heated and immersed at 40°C for 4 h. After the immersion was completed, the cotton fiber was separated, washed with water, and then dried to obtain modified cotton fiber.

[0061] Comparative Example 2

[0062] A small-diameter tampon and a preparation method thereof, comprising the following steps:

[0063] S1. Comb the modified cotton fibers and lay them into a 14g / m 2 The single layer of cotton fiber is then stacked, composited and shaped, and then cut to obtain a single layer of cotton fiber with a gram weight of 178g / m 2 The cotton fiber layer is wrapped with a non-woven fabric and then pressed into a strip-shaped fiber layer;

[0064] S2. Fix the sewing thread at the center of the strip fiber layer, with the tail end of the sewing thread exposed 16 cm outside the strip fiber layer, and then curl the sewn strip fiber layer to form a small-diameter cylinder with a diameter of 7 mm; then press the small-diameter cylinder into shape in a former and perform microwave heating treatment at a microwave heating temperature of 60°C and a heating time of 5 seconds to obtain the tampon body; finally, compress the tampon body into a catheter to obtain a small-diameter tampon with an outer diameter of 11 mm.

[0065] The preparation method of the modified cotton fiber is similar to that of Example 1, except that the sepiolite is not loaded with silver oxide, and specifically comprises the following steps:

[0066] (1) 78 g of cotton fiber was immersed in 200 mL of 2 mol / L sodium hydroxide aqueous solution for 2.5 h. After the immersion was completed, the fiber was taken out, washed and dried, and then dispersed in 200 mL of water. 40.2 g of epichlorohydrin and 69.8 g of polyetheramine were added thereto. The mixture was stirred and reacted at 60 ° C for 3 h. After the reaction was completed, the cotton fiber was separated, washed and dried to obtain pretreated cotton fiber.

[0067] (2) 10 g of sepiolite and 40 g of dopamine were added to 300 mL of Tris-HCl aqueous solution and mixed. The mixture was stirred with ultrasonic waves in an open container at room temperature for 2 h. The reaction product was centrifuged, washed, and dried to obtain polydopamine-modified sepiolite.

[0068] (3) 2.5 g of aqueous polyurethane, 3 g of sodium lauryl sulfate, 1 g of pentaerythritol glycidyl ether, 0.8 g of triethylamine, and 120 g of water were stirred and mixed evenly, and then 5 g of polydopamine-modified sepiolite was added and ultrasonically treated to obtain a mixed slurry; 18 g of pretreated cotton fiber was placed in the mixed slurry, heated and immersed at 40°C for 4 h. After the immersion was completed, the cotton fiber was separated, washed with water, and then dried to obtain modified cotton fiber.

[0069] Performance Testing

[0070] The tampons prepared in Examples 1-3 and Comparative Examples 1-2 were randomly selected, with 10 tampons in each group, and the absorption capacity was tested. The test results were averaged. The test results are shown in Table 1 below.

[0071] Table 1 Statistical results of cotton strip absorption

[0072]

[0073]

[0074] Antibacterial performance test: The modified cotton fibers obtained in Examples 1-3 and Comparative Examples 1-2 were twisted and woven into fabrics with a gram weight of 205±5 g / m 2 The test standard refers to GB / T20944.3-2008; the tested bacteria are Staphylococcus aureus (ATCC 6538) and Escherichia coli (ATCC 25922), and the action time is 3 hours. The test results are shown in Table 2:

[0075] Table 2 Antibacterial performance test results of fabrics

[0076]

[0077] It can be seen from the experimental data in Table 1 and Table 2 that the small-diameter tampon prepared by the present invention has good absorption and antibacterial properties.

[0078] The above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of the present invention.

Claims

1. A method for preparing a small diameter tampon, characterized in that: The steps include: S1, combing the modified cotton fibers, laying them into a single layer of cotton fibers after combing, then stacking and compounding the single layers of cotton fibers, and then cutting them to prepare a cotton fiber layer, wrapping the cotton fiber layer with a non-woven fabric, and then pressing them into a strip-shaped fiber layer; S2. Fix the sewing thread at the center of the strip fiber layer, with the tail end of the sewing thread exposed 10-20 cm outside the strip fiber layer, and then curl the sewn strip fiber layer to form a small-diameter cylinder; then press the small-diameter cylinder into shape in a former and perform microwave heating treatment to obtain the tampon body; finally, compress the tampon body into a catheter to obtain a small-diameter tampon.

2. The preparation method according to claim 1, wherein: The weight of the single layer of cotton fiber in step S1 is 12-16 g / m 2 The cotton fiber layer has a gram weight of 120-200 g / m 2 .

3. The preparation method according to claim 1, characterized in that The sizes of the small diameter cotton strips are as follows: the outer diameter of the R code is 10-12 mm, the outer diameter of the S code is 12-15 mm, and the outer diameter of the SP code is 14-17 mm.

4. The preparation method according to claim 1, characterized in that The preparation method of the modified cotton fiber comprises the following steps: (1) placing cotton fibers in a sodium hydroxide aqueous solution for immersion, taking them out after immersion, washing and drying them, and then dispersing them in water, adding epichlorohydrin and polyetheramine thereto, stirring and reacting them, separating the cotton fibers after the reaction is completed, washing and drying them, and obtaining pretreated cotton fibers; (2) dispersing sepiolite in water, then adding silver nitrate aqueous solution and stirring evenly, adding NaOH aqueous solution and stirring, and then transferring to a high-pressure reactor for hydrothermal reaction; after the reaction is completed, cooling and filtering, collecting the solid, washing, drying, calcining, and grinding to obtain a composite powder; adding the composite powder and dopamine to a Tris-HCl aqueous solution, mixing, and reacting in an open container with ultrasonic stirring at room temperature, and centrifuging, washing, and drying the reaction product to obtain a polydopamine-modified composite powder; (3) mixing waterborne polyurethane, sodium lauryl sulfate, pentaerythritol glycidyl ether, triethylamine, and water uniformly, then adding polydopamine modified composite powder and ultrasonically treating to obtain a mixed slurry; The pretreated cotton fibers are placed in a mixed pulp, heated and impregnated, and after the impregnation is completed, the cotton fibers are separated, washed with water and then dried to obtain modified cotton fibers.

5. The preparation method according to claim 4, characterized in that: In the step (1), the mass ratio of cotton fiber, epichlorohydrin, and polyetheramine is 5-10:3-5:6-8; the stirring reaction temperature is 50-60° C., and the reaction time is 2-4 hours.

6. The preparation method according to claim 4, characterized in that: In the step (2), the mass ratio of sepiolite to silver nitrate aqueous solution is 7-15:50-100.

7. The preparation method according to claim 4, characterized in that: The hydrothermal reaction temperature in step (2) is 160-200° C., and the reaction time is 8-10 h.

8. The preparation method according to claim 4, characterized in that In the step (2), the mass ratio of the composite powder to dopamine is 1:3-5.

9. The preparation method according to claim 4, characterized in that In the step (3), the mass ratio of aqueous polyurethane, sodium lauryl sulfate, pentaerythritol glycidyl ether, triethylamine, water, polydopamine-modified composite powder, and pretreated cotton fiber is 2-3:2-5:0.5-1.5:0.5-1:100-150:4-6:12-22; the heating and impregnation temperature is 30-50°C, and the impregnation time is 3-5h.

10. A small diameter tampon, characterized by: The compound is prepared by the preparation method according to any one of claims 1 to 9.

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