Punched surface cotton sliver and preparation method thereof

Abstract

The invention discloses a perforated surface cotton sliver and a preparation method thereof, and belongs to the technical field of hygienic products. The preparation method comprises the steps that firstly, modified cotton fibers are carded, stacked, shaped and cut to obtain a cotton fiber layer, then non-woven fabric with the surface perforated is adopted for wrapping and pressing, then sewing threads are used for sewing, fixing and curling the strip-shaped fiber layer, and after the strip-shaped fiber layer is loaded into a guide pipe, the perforated surface cotton sliver is obtained; the non-woven fabric with the punched surface can quickly guide liquid to permeate into the cotton fiber layer through the holes, the absorption speed of the liquid is increased, surface staying is reduced, and compared with common non-woven fabric, the phenomenon that the liquid is diffused and gathered on the surface is reduced, so that the overflow condition is avoided, and the non-woven fabric is more suitable for the requirement for absorbing a large amount of liquid.

Description

Technical Field

[0001] The invention relates to the technical field of sanitary products, and in particular to a tampon with a perforated surface and a preparation method thereof. Background Art

[0002] Tampons are an internal sanitary product used by women during menstruation to absorb menstrual blood. They are usually made of soft absorbent material, in strips, and can be inserted into the vagina. Compared with traditional sanitary napkins, tampons have the characteristics of strong concealment and high freedom of movement. They will not be exposed after use, making them more suitable for activities such as swimming and sports; due to their internal placement characteristics, they are not easy to shift or affect activities.

[0003] In the field of feminine hygiene products, tampons are one of the core products for menstrual management, and their surface structure design directly affects the comfort and functionality of use. Traditional tampons are mostly made of non-woven fabrics or cotton materials to wrap the absorbent core, and the surface is usually smooth or simply embossed. The liquid diffuses slowly on the surface and is difficult to quickly penetrate into the internal absorption layer, resulting in low absorption efficiency, especially in scenarios with high absorption requirements. Summary of the invention

[0004] The main purpose of the present invention is to propose a perforated surface tampon and a preparation method thereof, wherein a cotton fiber layer is wrapped with a non-woven fabric with a perforated surface. The non-woven fabric with a perforated surface can quickly guide the liquid to penetrate into the cotton fiber layer through the holes, thereby increasing the absorption rate of the liquid and reducing surface retention. Compared with ordinary non-woven fabrics, the phenomenon of liquid diffusion and aggregation on the surface is reduced, thereby avoiding overflow, and is more suitable for absorbing large amounts of liquid.

[0005] To achieve the above object, the present invention provides a method for preparing a perforated surface tampon, comprising the following steps:

[0006] S1, combing the modified cotton fibers, laying them into a single layer of cotton fibers after combing, then stacking and compounding the single layer of cotton fibers, and then cutting them to prepare a cotton fiber layer, wrapping the cotton fiber layer with a non-woven fabric with holes on the surface, and then pressing them into a strip-shaped fiber layer;

[0007] 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 long cylindrical absorbent body, press it in a former and then perform microwave heating to obtain a tampon body; finally, compress the tampon body into a catheter to obtain a perforated surface tampon.

[0008] Preferably, the weight of the single-layer cotton fiber in step S1 is 12-16 g / m 2 The cotton fiber layer has a gram weight of 120-200 g / m2 。

[0009] Preferably, the basis weight of the non-woven fabric with surface holes in step S1 is 30-50 g / m 2 ; the pore diameter of the holes on the non-woven fabric is 0.5-1 mm, and the spacing between adjacent holes is 1-2 mm.

[0010] Preferably, the temperature of microwave heating in step S2 is 50-65 °C, and the time of microwave heating is 2-8 s.

[0011] Preferably, the preparation method of the modified cotton fiber includes the following steps:

[0012] (1) Immerse the cotton fiber in an aqueous sodium hydroxide solution, take it out after immersion, wash and dry it, disperse it in water, add epichlorohydrin and polyetheramine, stir and react. After the reaction is completed, separate the cotton fiber, wash and dry it to obtain pretreated cotton fiber;

[0013] (2) Disperse graphene oxide in an aqueous ethanol solution, add vinyltriisopropoxysilane, heat and react to obtain vinyl graphene oxide. Disperse vinyl graphene oxide in water, add allyl-β-cyclodextrin and mix evenly, then add ammonium persulfate, react at a constant temperature. After the reaction is completed, filter, collect the solid product, wash and dry it, add it to dimethyl sulfoxide, add guanidino propionic acid and phosphoric acid, heat and react. After the reaction is completed, filter, wash and dry to obtain modified graphene oxide;

[0014] (3) Stir and mix aqueous polyurethane, sodium dodecyl sulfate, pentaerythritol glycidyl ether, triethylamine and water evenly, then add modified graphene oxide and stir and ultrasonically treat to obtain a mixed solution; place the pretreated cotton fiber in the mixed solution, heat and immerse it. After immersion, separate the cotton fiber, wash it with water and then dry it to obtain modified cotton fiber.

[0015] 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.

[0016] Preferably, in step (2), the mass ratio of graphene oxide, vinyltriisopropoxysilane, allyl-β-cyclodextrin and guanidino propionic acid is 15-25:3-5:8-12:4-6; the heating reaction temperature is 40-70 °C, and the reaction time is 3-5 h; the constant temperature reaction temperature is 60-80 °C, and the reaction time is 4-6 h; the heating reaction temperature is 80-90 °C, and the reaction time is 5-7 h.

[0017] Preferably, in the step (3), the mass ratio of aqueous polyurethane, sodium dodecyl sulfate, pentaerythritol glycidyl ether, triethylamine, water, modified graphene oxide, and pretreated cotton fiber is 1-3:1-5:0.5-1.5:0.5-1:100-150:3-5:15-25; the heating and impregnation temperature is 30-50°C, and the impregnation time is 3-5h.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1) The present invention provides a perforated surface cotton strip and a preparation method thereof, wherein the modified cotton fibers are first combed, stacked, shaped and cut to obtain a cotton fiber layer, and then the perforated surface non-woven fabric is used to wrap and press the cotton strip, and then the strip fiber layer is sewn and fixed with sewing thread, curled, and loaded into a catheter to obtain the perforated surface cotton strip; the perforated surface non-woven fabric can quickly guide liquid to penetrate into the cotton fiber layer through the holes, increase the absorption speed of the liquid, and reduce the surface retention. Compared with ordinary non-woven fabrics, the phenomenon of liquid diffusion and aggregation on the surface is reduced, thereby avoiding overflow, and is more suitable for the demand of absorbing a large amount of liquid;

[0020] 2) The present invention can remove natural impurities in the cotton fiber by treating the cotton fiber with an aqueous sodium hydroxide solution, thereby expanding the internal pore structure of the fiber, improving the moisture absorption and moisture conduction capabilities, and exposing more active sites. Then, the polyetheramine is grafted onto the cotton fiber under the action of epichlorohydrin. The polyether long chain segment of the polyetheramine can effectively improve the softness of the cotton fiber, and the mutual entanglement between the long side chains helps to further form a void structure, enhance the capillary absorption of the cotton fiber, thereby improving the absorption efficiency and storage and fixation performance of blood;

[0021] 3) The present invention treats graphene oxide by vinyl triisopropoxy silane, so that carbon-carbon double bonds can be introduced on its surface, and then allyl-β-cyclodextrin is grafted onto graphene oxide through a reverse addition reaction with allyl-β-cyclodextrin. The grafting of allyl-β-cyclodextrin can improve the hygroscopicity of graphene oxide on the one hand, and the cavity of cyclodextrin has strong adsorption, which can adsorb killed microorganisms and improve the absorption and fixation ability of blood. Finally, guanidine propionic acid is grafted onto graphene oxide, which is beneficial to improve the antibacterial property of modified cotton fiber.

[0022] 4) The present invention uses a mixed solution 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 modified graphene oxide and the cotton fiber, enabling the modified graphene oxide 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

[0023] For the sake of brevity, unless otherwise specified, the items used in the following examples are all commercially available products, and the methods used are all conventional methods unless otherwise specified.

[0024] The sources of some raw materials used in the present invention are as follows:

[0025] Graphene oxide, with a diameter of 0.8 - 2 μm and a thickness of 0.6 - 1.2 nm, is purchased from Suzhou Kaifa New Material Technology Co., Ltd.

[0026] Polyetheramine, D400, is purchased from Shanghai Macklin Biochemical Co., Ltd.

[0027] Waterborne polyurethane, with the brand Leasys 3250, is purchased from Shizhong Mingzhi Chemistry (Shanghai) Co., Ltd.

[0028] Example 1

[0029] A preparation method of a perforated surface tampon, comprising the following steps:

[0030] S1. Card the modified cotton fibers, lay them into a single layer of cotton fibers after carding, then stack and compound and shape the single layer of cotton fibers, and then obtain a cotton fiber layer through cutting. Wrap the cotton fiber layer with non-woven fabric with surface perforations, and then press it into a strip-shaped fiber layer; the gram weight of the single layer of cotton fibers is 15 g / m 2 , the gram weight of the cotton fiber layer is 160 g / m 2 ; the gram weight of the non-woven fabric with surface perforations is 40 g / m 2 ; the pore diameter of the pores on the non-woven fabric is 0.8 mm, and the interval between adjacent pores is 1.5 mm;

[0031] S2. Fix the sewing thread at the central position of the strip-shaped fiber layer, with the end of the sewing thread exposed 15 cm outside the strip-shaped fiber layer. Then curl the sewn strip-shaped fiber layer to form a long cylindrical absorber, and press and shape it in a former and then perform microwave heating treatment to obtain the tampon body of the sanitary tampon; the temperature of the microwave heating is 60 °C, and the time of the microwave heating is 5 s; finally, compress the tampon body of the sanitary tampon into a catheter to obtain the perforated surface tampon.

[0032] The preparation method of the modified cotton fibers comprises the following steps:

[0033] (1) Immerse 80 g of cotton fibers in 500 mL of 2 mol / l sodium hydroxide aqueous solution for 3 h. After immersion, take them out, wash and dry them, disperse them in 500 mL of water, add 40 g of epichlorohydrin and 70 g of polyetheramine thereto, and stir and react at 60 °C for 3 h. After the reaction is completed, separate the cotton fibers, wash and dry them to obtain pretreated cotton fibers;

[0034] (2) Disperse 20 g of graphene oxide in 200 mL of 50 wt% ethanol aqueous solution, add 4.2 g of vinyltriisopropoxysilane, heat and react at 50 °C for 4 h, filter, collect the solid, wash and dry to obtain vinyl graphene oxide. Disperse the vinyl graphene oxide in 200 mL of water, add 10 g of allyl-β-cyclodextrin and mix evenly, then add 3 g of ammonium persulfate, react at a constant temperature of 70 °C for 5 h. After the reaction is completed, filter, collect the solid product, wash and dry it, and then add it to 200 mL of dimethyl sulfoxide. Add 5 g of guanidino propionic acid and 0.5 g of phosphoric acid, raise the temperature to 85 °C and react for 6 h. After the reaction is completed, filter, collect the solid, wash and dry to obtain modified graphene oxide;

[0035] (3) Stir and mix evenly 2 g of waterborne polyurethane, 3 g of sodium dodecyl sulfate, 1 g of pentaerythritol glycidyl ether, 0.8 g of triethylamine and 120 g of water, then add 4.2 g of modified graphene oxide and stir and ultrasonically treat to obtain a mixed solution; Place 20 g of pretreated cotton fibers in the mixed solution, heat and impregnate at 40 °C for 4 h. After impregnation, separate the cotton fibers, wash with water and then dry to obtain modified cotton fibers.

[0036] Example 2

[0037] A preparation method of a perforated surface tampon, comprising the following steps:

[0038] S1. Card the modified cotton fibers. After carding, lay them into a single layer of cotton fibers. Then stack and compound and shape the single layer of cotton fibers, and then cut to obtain a cotton fiber layer. Wrap the cotton fiber layer with non-woven fabric with surface perforations, and then press it into a strip-shaped fiber layer; The gram weight of the single layer of cotton fibers is 12 g / m 2 , and the gram weight of the cotton fiber layer is 120 g / m 2 ; The gram weight of the non-woven fabric with surface perforations is 30 g / m 2 ; The aperture of the holes on the non-woven fabric is 0.5 mm, and the interval between adjacent holes is 1 mm;

[0039] S2. Fix the sewing thread at the center position of the strip-shaped fiber layer, and the tail end of the sewing thread is exposed 10 cm outside the strip-shaped fiber layer. Then curl the sewn strip-shaped fiber layer to form a long strip-shaped cylindrical absorbent body, press and shape it in a former, and then perform microwave heating treatment to obtain the tampon body of the sanitary tampon; The temperature of the microwave heating is 50 °C, and the time of the microwave heating is 8 s; Finally, compress the tampon body of the sanitary tampon into a catheter to obtain a perforated surface tampon.

[0040] The preparation method of the modified cotton fibers comprises the following steps:

[0041] (1) Immerse 80 g of cotton fibers in 500 mL of 2 mol / L sodium hydroxide aqueous solution for 3 h. After immersion, take them out, wash and dry, then disperse them in 500 mL of water. Add 48 g of epichlorohydrin and 96 g of polyetheramine, and stir and react at 50 °C for 4 h. After the reaction is completed, separate the cotton fibers, wash and dry to obtain pretreated cotton fibers;

[0042] (2) Disperse 15 g of graphene oxide in 200 mL of 50 wt% ethanol aqueous solution, add 3 g of vinyltriisopropoxysilane, and heat and react at 40 °C for 5 h. Filter and collect the solid, wash and dry to obtain vinyl graphene oxide. Disperse the vinyl graphene oxide in 200 mL of water, add 8 g of allyl-β-cyclodextrin and mix evenly, then add ammonium persulfate, and react at a constant temperature of 60 °C for 6 h. After the reaction is completed, filter, collect the solid product, wash and dry, and then add it to 200 mL of dimethyl sulfoxide. Add 4 g of guanidino propionic acid and 0.3 g of phosphoric acid, heat up to 60 °C and react for 6 h. After the reaction is completed, filter, collect the solid, wash and dry to obtain modified graphene oxide;

[0043] (3) Stir and mix evenly 1 g of waterborne polyurethane, 1 g of sodium dodecyl sulfate, 0.5 g of pentaerythritol glycidyl ether, 0.5 g of triethylamine and 100 g of water, then add 3 g of modified graphene oxide and stir and ultrasonically treat to obtain a mixed solution. Place 15 g of pretreated cotton fibers in the mixed solution, heat and immerse at 30 °C for 5 h, separate the cotton fibers, wash with water and then dry to obtain modified cotton fibers.

[0044] Example 3

[0045] A preparation method of a perforated surface cotton strip, comprising the following steps:

[0046] S1. Card the modified cotton fibers. After carding, lay them into a single layer of cotton fibers. Then stack and compound and shape the single layer of cotton fibers, and then obtain a cotton fiber layer through cutting. Wrap the cotton fiber layer with a non-woven fabric with surface perforations, and then press it into a strip-shaped fiber layer; the gram weight of the single layer of cotton fibers is 16 g / m 2 , and the gram weight of the cotton fiber layer is 200 g / m 2 ; the gram weight of the non-woven fabric with surface perforations is 50 g / m 2 ; the pore diameter of the holes on the non-woven fabric is 1 mm, and the interval between adjacent holes is 2 mm;

[0047] S2. Fix the sewing thread at the center position of the strip-shaped fiber layer. The end of the sewing thread is exposed 20 cm outside the strip-shaped fiber layer. Then, curl the strip-shaped fiber layer after sewing to form a long cylindrical absorbent body, and perform microwave heating treatment after pressing and forming in a former to obtain the tampon body of the sanitary tampon. The temperature of the microwave heating is 65 °C, and the time of the microwave heating is 2 s. Finally, compress the tampon body of the sanitary tampon into a catheter to obtain a perforated surface tampon.

[0048] The preparation method of the modified cotton fiber includes the following steps:

[0049] (1) Immerse 80 g of cotton fiber in 500 mL of 2 mol / l sodium hydroxide aqueous solution for 3 h. After immersion, take it out, wash and dry it, disperse it in 500 mL of water, add 40 g of epichlorohydrin and 64 g of polyetheramine, and stir and react at 60 °C for 2 h. After the reaction is completed, separate the cotton fiber, wash and dry it to obtain pretreated cotton fiber.

[0050] (2) Disperse 25 g of graphene oxide in 200 mL of 50 wt% ethanol aqueous solution, add 5 g of vinyltriisopropoxysilane, heat and react at 70 °C for 3 h, filter, collect the solid, wash and dry it to obtain vinyl graphene oxide. Disperse the vinyl graphene oxide in 200 mL of water, add 12 g of allyl-β-cyclodextrin and mix evenly, then add 3 g of ammonium persulfate, and react at 80 °C for 4 h. After the reaction is completed, filter, collect the solid product, wash and dry it, and add it to 200 mL of dimethyl sulfoxide. Add 6 g of guanidino propionic acid and 0.5 g of phosphoric acid, raise the temperature to 90 °C and react for 5 h. After the reaction is completed, filter, collect the solid, wash and dry it to obtain modified graphene oxide.

[0051] (3) Stir and mix evenly 3 g of waterborne polyurethane, 5 g of sodium dodecyl sulfate, 1.5 g of pentaerythritol glycidyl ether, 1 g of triethylamine and 150 g of water, then add 5 g of modified graphene oxide and stir and ultrasonically treat to obtain a mixed solution. Place 25 g of pretreated cotton fiber in the mixed solution, heat and immerse it at 50 °C for 3 h. After immersion, separate the cotton fiber, wash it with water and dry it to obtain modified cotton fiber.

[0052] Comparative Example 1

[0053] A preparation method of a perforated surface tampon includes the following steps:

[0054] S1. Card the modified cotton fiber. After carding, lay it into a single layer of cotton fiber. Then stack and compound and shape the single layer of cotton fiber, and cut it to obtain a cotton fiber layer. Wrap the cotton fiber layer with a non-woven fabric with surface holes, and then press it into a strip-shaped fiber layer. The gram weight of the single layer of cotton fiber is 15 g / m 2, the grammage of the cotton fiber layer is 160 g / m 2 ; the grammage of the non-woven fabric with surface perforations is 40 g / m 2 ; the aperture of the holes on the non-woven fabric is 0.8 mm, and the interval between adjacent holes is 1.5 mm;

[0055] S2. Fix the sewing thread at the central position of the strip-shaped fiber layer, with the tail end of the sewing thread exposed 15 cm outside the strip-shaped fiber layer. Then curl the completed strip-shaped fiber layer to form a long cylindrical absorbent body, and after pressing and forming in a former, perform microwave heating treatment to obtain the tampon body of the sanitary tampon; the temperature of the microwave heating is 60 °C, and the time of the microwave heating is 5 s; finally, compress the tampon body of the sanitary tampon into a catheter to obtain the perforated surface tampon.

[0056] The preparation method of the modified cotton fiber is similar to that of Example 1, the difference being that the cotton fiber is not grafted with polyetheramine, and specifically includes the following steps:

[0057] (1) Immerse 80 g of cotton fiber in 500 mL of 2 mol / l sodium hydroxide aqueous solution for 3 h. After immersion, take it out, wash and dry to obtain pretreated cotton fiber;

[0058] (2) Disperse 20 g of graphene oxide in 200 mL of 50 wt% ethanol aqueous solution, add 4.2 g of vinyltriisopropoxysilane, heat and react at 50 °C for 4 h, filter, collect the solid matter, wash and dry to obtain vinyl graphene oxide. Disperse the vinyl graphene oxide in 200 mL of water, add 10 g of allyl-β-cyclodextrin and mix evenly, then add 3 g of ammonium persulfate, and react at 70 °C for 5 h. After the reaction is completed, filter, collect the solid product, wash and dry, and then add it to 200 mL of dimethyl sulfoxide, add 5 g of guanidino propionic acid and 0.5 g of phosphoric acid, heat up to 85 °C and react for 6 h. After the reaction is completed, filter, collect the solid matter, wash and dry to obtain modified graphene oxide;

[0059] (3) Stir and mix evenly 2 g of waterborne polyurethane, 3 g of sodium dodecyl sulfate, 1 g of pentaerythritol glycidyl ether, 0.8 g of triethylamine and 120 g of water, then add 4.2 g of modified graphene oxide and stir and ultrasonically treat to obtain a mixed solution; place 20 pretreated cotton fibers in the mixed solution, heat and immerse at 40 °C for 4 h. After immersion, separate the cotton fibers, wash with water and dry to obtain modified cotton fibers.

[0060] Comparative Example 2

[0061] A preparation method of a perforated surface tampon includes the following steps:

[0062] S1. Card the modified cotton fibers. After carding, lay them into a single layer of cotton fibers. Then stack and composite the single-layer cotton fibers and cut them to obtain a cotton fiber layer. Wrap the cotton fiber layer with non-woven fabric with surface holes, and then press it into a strip-shaped fiber layer. The gram weight of the single-layer cotton fiber is 15 g / m 2 , and the gram weight of the cotton fiber layer is 160 g / m 2 ; The gram weight of the non-woven fabric with surface holes is 40 g / m 2 ; The aperture of the holes on the non-woven fabric is 0.8 mm, and the interval between adjacent holes is 1.5 mm;

[0063] S2. Fix the sewing thread at the center position of the strip-shaped fiber layer. The tail end of the sewing thread is exposed 15 cm outside the strip-shaped fiber layer. Then curl the sewn strip-shaped fiber layer to form a long strip-shaped cylindrical absorbent body, press and shape it in a former, and then perform microwave heating treatment to obtain the tampon body of the sanitary tampon. The temperature of the microwave heating is 60 °C, and the time of the microwave heating is 5 s. Finally, compress the tampon body of the sanitary tampon into a catheter to obtain a cotton tampon with a perforated surface.

[0064] The preparation method of the modified cotton fibers is similar to that of Example 1, except that graphene oxide is not modified, and it specifically includes the following steps:

[0065] (1) Immerse 80 g of cotton fibers in 500 mL of 2 mol / l sodium hydroxide aqueous solution for 3 h. After immersion, take them out, wash and dry them, disperse them in 500 mL of water, add 40 g of epichlorohydrin and 70 g of polyetheramine, stir and react at 60 °C for 3 h. After the reaction is completed, separate the cotton fibers, wash and dry them to obtain pretreated cotton fibers;

[0066] (2) Stir and mix 2 g of waterborne polyurethane, 3 g of sodium dodecyl sulfate, 1 g of pentaerythritol glycidyl ether, 0.8 g of triethylamine, and 120 g of water evenly, and then add 4.2 g of graphene oxide and stir and ultrasonically treat to obtain a mixed solution; Place 20 g of pretreated cotton fibers in the mixed solution, heat and immerse them at 40 °C for 4 h, separate the cotton fibers, wash them with water and then dry them to obtain modified cotton fibers.

[0067] Comparative Example 3

[0068] A preparation method of a cotton tampon with a perforated surface includes the following steps:

[0069] S1. Card the modified cotton fibers. After carding, lay them into a single layer of cotton fibers. Then stack and composite the single-layer cotton fibers and cut them to obtain a cotton fiber layer. Wrap the cotton fiber layer with non-woven fabric with surface holes, and then press it into a strip-shaped fiber layer. The gram weight of the single-layer cotton fiber is 15 g / m 2, the grammage of the cotton fiber layer is 160 g / m 2 ; the grammage of the non-woven fabric with surface perforations is 40 g / m 2 ; the aperture of the holes on the non-woven fabric is 0.8 mm, and the interval between adjacent holes is 1.5 mm;

[0070] S2. Fix the sewing thread at the central position of the strip-shaped fiber layer. The end of the sewing thread is exposed 15 cm outside the strip-shaped fiber layer. Then curl the sewn strip-shaped fiber layer to form a long cylindrical absorbent body, and after pressing and forming in a former, perform microwave heating treatment to obtain the tampon body of the sanitary tampon. The temperature of the microwave heating is 60 °C, and the time of the microwave heating is 5 s. Finally, compress the tampon body of the sanitary tampon into the catheter to obtain the perforated surface tampon.

[0071] The preparation method of the modified cotton fiber is similar to that of Example 1, except that pentaerythritol glycidyl ether is not added, and specifically includes the following steps:

[0072] (1) Immerse 80 g of cotton fiber in 500 mL of 2 mol / l sodium hydroxide aqueous solution for 3 h. After immersion, take it out, wash and dry it, and disperse it in 500 mL of water. Add 40 g of epichlorohydrin and 70 g of polyetheramine, and stir and react at 60 °C for 3 h. After the reaction is completed, separate the cotton fiber, wash and dry it to obtain pretreated cotton fiber;

[0073] (2) Disperse 20 g of graphene oxide in 200 mL of 50 wt% ethanol aqueous solution, add 4.2 g of vinyltriisopropoxysilane, heat and react at 50 °C for 4 h, filter, collect the solid matter, wash and dry it to obtain vinyl graphene oxide. Disperse the vinyl graphene oxide in 200 mL of water, add 10 g of allyl-β-cyclodextrin and mix evenly, then add 3 g of ammonium persulfate, and react at 70 °C for 5 h. After the reaction is completed, filter, collect the solid product, wash and dry it, and add it to 200 mL of dimethyl sulfoxide. Add 5 g of guanidino propionic acid and 0.5 g of phosphoric acid, heat up to 85 °C and react for 6 h. After the reaction is completed, filter, collect the solid matter, wash and dry it to obtain modified graphene oxide;

[0074] (3) Stir and mix evenly 2 g of waterborne polyurethane, 3 g of sodium dodecyl sulfate, 0.8 g of triethylamine and 120 g of water, then add 4.2 g of modified graphene oxide and stir and ultrasonically treat to obtain a mixed solution. Place 20 g of pretreated cotton fiber in the mixed solution, heat and immerse it at 40 °C for 4 h. After immersion, separate the cotton fiber, wash it with water and dry it to obtain modified cotton fiber.

[0075] Performance test

[0076] Randomly select the tampons prepared in Examples 1-3 and Comparative Examples 1-3, with 10 in each group, test the absorption capacity, and take the average value of the test results. The test results are shown in Table 1 below;

[0077] Table 1 Statistical results of the absorption capacity of tampons

[0078] Group Absorption amount Example 1 10.96 Example 2 10.88 Example 3 10.98 Comparative Example 1 9.36 Comparative Example 2 9.08 Comparative Example 3 8.54

[0079] Antibacterial performance test: Twist and weave the modified cotton fibers obtained in Examples 1-3 and Comparative Examples 1-3 into fabrics, and the fabric weight per unit area is 205±5 g / m 2 , and the detection standard refers to GB / T20944.3-2008; among them, the test bacteria are Staphylococcus aureus (ATCC 6538) and Escherichia coli (ATCC 25922), and the action time is 3 h. The test results are shown in Table 2:

[0080] Table 2 Test results of the antibacterial performance of fabrics

[0081]

[0082] It can be seen from the experimental data in Table 1 and Table 2 that the perforated surface tampons prepared by the present invention have good absorption and antibacterial properties.

[0083] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the patent protection scope of the present invention.

Claims

1. A method for preparing a perforated surface tampon, characterized in that, It includes the following steps: S1. Card the modified cotton fibers. After carding, lay them into a single layer of cotton fibers. Then stack and compound the single-layer cotton fibers and cut them after shaping to obtain a cotton fiber layer. Wrap the cotton fiber layer with a non-woven fabric with holes on the surface, and then press it into a strip-shaped fiber layer. S2. Fix the sewing thread at the center position of the strip-shaped fiber layer. The tail end of the sewing thread is exposed 10 - 20 cm outside the strip-shaped fiber layer. Then curl the sewn strip-shaped fiber layer to form a long cylindrical absorber, press and shape it in a former, and then perform microwave heating treatment to obtain the tampon body of the sanitary tampon. Finally, compress the tampon body of the sanitary tampon into a catheter to obtain a tampon with a perforated surface.

2. The preparation method according to claim 1, wherein: In the step S1, the gram weight of the single-layer cotton fiber is 12-16 g / m 2 , and the gram weight of the cotton fiber layer is 120-200 g / m 2 ; in the step S1, the gram weight of the non-woven fabric with holes on the surface is 30-50 g / m 2 ; the aperture of the holes on the non-woven fabric is 0.5-1 mm, and the interval between adjacent holes is 1-2 mm; in the step S2, the temperature of the microwave heating is 50-65 °C, and the time of the microwave heating is 2-8 s.

3. The preparation method according to claim 1, wherein, The preparation method of the modified cotton fibers includes the following steps: (1) Immerse the cotton fibers in an aqueous sodium hydroxide solution. After immersion, take them out, wash, dry, and disperse them in water. Add epichlorohydrin and polyetheramine to it, stir and react. After the reaction is completed, separate the cotton fibers, wash and dry them to obtain pretreated cotton fibers. (2) Disperse graphene oxide in an ethanol aqueous solution, add vinyltriisopropoxysilane, and heat and react to obtain vinyl graphene oxide. Disperse vinyl graphene oxide in water, add allyl-β-cyclodextrin and mix evenly, then add ammonium persulfate, and react at a constant temperature. After the reaction is completed, filter, collect the solid product, wash and dry it, add it to dimethyl sulfoxide, add guanidino propionic acid and phosphoric acid, heat and react. After the reaction is completed, filter, wash, and dry to obtain modified graphene oxide. (3) Stir and mix aqueous polyurethane, sodium dodecyl sulfate, pentaerythritol glycidyl ether, triethylamine, and water evenly, and then add modified graphene oxide and stir and ultrasonically treat to obtain a mixed solution. Place the pretreated cotton fibers in the mixed solution, heat and immerse them. After immersion, separate the cotton fibers, wash them with water and dry them to obtain modified cotton fibers.

4. The preparation method according to claim 3, characterized in that: In the step (1), the mass ratio of cotton fibers, epichlorohydrin, and polyetheramine is 5 - 10:3 - 5:6 - 8.

5. The preparation method according to claim 3, characterized in that, In the step (1), the stirring reaction temperature is 50 - 60 °C, and the reaction time is 2 - 4 h.

6. The preparation method according to claim 3, characterized in that: In the step (2), the mass ratio of graphene oxide, vinyltriisopropoxysilane, allyl-β-cyclodextrin, and guanidino propionic acid is 15 - 25:3 - 5:8 - 12:4 - 6.

7. The preparation method according to claim 3, characterized in that, It includes the following steps: In the step (2), the heating reaction temperature is 40 - 70 °C, and the reaction time is 3 - 5 h.

8. The preparation method according to claim 3, characterized in that: In the step (2), the temperature rising reaction temperature is 80 - 90 °C, and the reaction time is 5 - 7 h.

9. The preparation method according to claim 3, characterized in that: In the step (3), the mass ratio of aqueous polyurethane, sodium dodecyl sulfate, pentaerythritol glycidyl ether, triethylamine, water, modified graphene oxide, and pretreated cotton fibers is 1 - 3:1 - 5:0.5 - 1.5:0.5 - 1:100 - 150:3 - 5:15 - 25.

10. A perforated surface tampon, characterized in that: Prepared by the preparation method according to any one of claims 1 - 9.

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