Tampon with dyed pull rope and preparation method of tampon

Abstract

The invention discloses a tampon with a dyed pull rope and a preparation method thereof.The dyed pull rope is obtained by conducting opening, carding, drawing, combing and blending on modified cotton fibers and modified bamboo fibers and then doubling and twisting the modified cotton fibers and the modified bamboo fibers into double strands, and the dyed pull rope is obtained through the steps that firstly, the bamboo fibers are pretreated through potassium permanganate; the strength and toughness of the bamboo fibers are improved, then the bamboo fibers are endowed with antibacterial performance through grafting treatment of silk fibroin, growth of bacteria and other microorganisms can be effectively inhibited, the hygienic safety of the product is improved, and then a layer of film is formed through dipping treatment of a mixed solution of dye and polyethylene glycol; the method comprises the following steps: adding a pigment into modified bamboo fibers, enhancing the binding force between the pigment and the modified bamboo fibers, improving the color fastness of the dyed bamboo fibers, then reacting cotton fibers with 4, 4 '-diphenyl ether dianhydride and p-phenylenediamine, and meanwhile, forming a polyimide coating film on the surface of the cotton fibers, thereby improving the toughness and antibacterial property of the cotton fibers.

Description

Technical Field

[0001] The present invention relates to the technical field of sanitary products, and particularly relates to a tampon with a dyed drawstring and a preparation method thereof. Background Art

[0002] A tampon (also known as a sanitary tampon or cotton tampon) is a feminine hygiene product widely used for managing menstrual flow. Its core function lies in internal absorption, enabling women to carry out daily activities more comfortably during menstruation and avoiding the inconveniences brought by traditional sanitary pads.

[0003] Modern tampons are usually made of water-absorbent materials (such as cotton, synthetic fibers, etc.), and usually have a waterproof and breathable covering layer on the outer layer to reduce the risk of leakage. The earliest tampons did not consider the antibacterial function, but with the increasing attention to women's health and the understanding of infections and discomfort symptoms during menstruation, existing tampons, on the basis of traditional tampons, aim to reduce bacterial growth and lower the risk of infection by adding antibacterial components. The drawstring is an important part of the tampon, usually made of stretch-resistant materials, enabling the tampon to be conveniently and safely removed when replacement is needed. However, the potential hygienic and safety problems caused by the drawstring of the tampon are often overlooked.

[0004] Currently, the drawstrings of tampons on the market generally use cotton thread material and are in a single white color. Although this design meets the basic usage requirements to a certain extent, from the perspective of actual usage experience and product optimization, there are obvious deficiencies, and the most prominent problem is the lack of identifiability. The white cotton thread drawstring is extremely ordinary in appearance and is difficult to attract the special attention of users in various usage scenarios. This leads to the situation that in some emergency or poor light conditions, users may have difficulty quickly and accurately finding the drawstring, thus increasing the difficulty and time cost of removing the tampon. For example, when getting up at night to change a tampon, if the surrounding light is dim, the white drawstring may blend in with other white parts of the tampon, making it difficult for users to distinguish and causing inconvenience in operation.

[0005] Therefore, how to prepare a tampon that is comprehensively hygienic and safe and has identifiability is an issue that needs to be focused on currently. Summary of the Invention

[0006] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide a tampon with a dyed drawstring and a preparation method thereof, so as to solve the hygienic and safety problems caused by the lack of antibacterial function of the drawstring of current tampons.

[0007] To achieve the above purpose, the present invention adopts the following technical solutions:

[0008] The present invention provides a method for preparing a tampon with a dyed drawstring. The dyed drawstring is obtained by opening, carding, drawing, combing and blending modified cotton fibers and modified bamboo fibers, and then doubling and twisting them into a double-strand thread. The method for preparing the tampon includes the following steps:

[0009] S10. Add cotton fibers to the H 2 O 2 solution, heat for a period of time, wash and dry to obtain pretreated cotton fibers. Then add the pretreated cotton fibers to a zinc chloride solution, react at 60-80°C for 0.5-1 h, filter and dry to obtain antibacterial cotton fibers;

[0010] S20. Card the antibacterial cotton fibers, lay them into a single layer of cotton fibers after carding, stack the single-layer cotton fibers to obtain a cotton web layer, wrap the cotton web layer with non-woven fabric, and then press it into a strip-shaped fiber layer;

[0011] S30. Fix the dyed drawstring at the central part of the strip-shaped fiber layer, with the tail end of the drawstring exposed 10-20 cm outside the strip-shaped fiber layer. Then curl the strip-shaped fiber layer into a long cylindrical absorbent body, press and form it in a former, and then perform microwave heating treatment to obtain the tampon body of the tampon;

[0012] S40. Load the tampon body into a catheter to make a tampon with a dyed drawstring.

[0013] Preferably, the method for preparing the dyed drawstring includes the following steps:

[0014] S1. Add deionized water to a reactor containing bamboo fibers, then add potassium permanganate, stir, filter and dry to obtain pretreated bamboo fibers;

[0015] S2. Add distilled water to a reactor containing silk fibroin to obtain a silk fibroin solution. Then immerse the pretreated bamboo fibers in the silk fibroin solution, add an EDC / NHS mixed solvent, and then heat in a water bath, stir for a period of time and filter. Put the filter residue into an oven for baking to obtain silk fibroin-grafted bamboo fibers;

[0016] S3. Add NaOH and NaS to DMSO 2 O 4 , stir and dissolve, then add pigment powder to obtain a pigment solution. Mix the pigment solution with a polyethylene glycol solution dissolved in DMSO, add ascorbic acid, perform ultrasonic treatment to obtain a mixed solution, then immerse the silk fibroin-grafted bamboo fibers in the mixed solution, perform ultrasonic treatment, filter, wash and dry to obtain dyed modified bamboo fibers;

[0017] S4. Place the cotton fibers in an acidic solution, heat and impregnate for a period of time, then add 4,4'-oxydianiline and p-phenylenediamine, then add a catalyst and an auxiliary agent, heat and stir for a period of time, filter and dry to obtain modified cotton fibers;

[0018] S5. Open and mix the modified cotton fibers and the dyed and modified bamboo fibers in a ratio of (3 - 6):(1 - 2) by mass on an opener to form mixed fibers, then card, draw, comb and blend the mixed fibers, and then twist them into a double-strand thread to obtain a dyed drawstring.

[0019] Preferably, in step S1, the drying temperature is 40 - 50 °C, for example, the drying temperatures are 40 °C, 45 °C, 50 °C.

[0020] Preferably, in step S2, the water bath heating temperature is 50 - 60 °C and the stirring time is 2 - 3 h; the baking step is: keep warm at 70 - 80 °C for 5 - 10 min, then raise the temperature to 140 - 160 °C and bake for 3 - 5 min, for example, keep warm at 70 °C for 5 min, then raise the temperature to 140 °C and bake for 3 min, keep warm at 75 °C for 8 min, then raise the temperature to 150 °C and bake for 4 min, keep warm at 80 °C for 10 min, then raise the temperature to 160 °C and bake for 5 min.

[0021] Preferably, in step S3, the mass ratio of DMSO to the pigment powder is 15 - 25:1, the mass concentration of polyethylene glycol in the polyethylene glycol solution is 5% - 10%, and the volume ratio of the pigment solution to the polyethylene glycol solution is (1 - 3):(16 - 24), for example, the volume ratio of the pigment solution to the polyethylene glycol solution is 1:16, the volume ratio of the pigment solution to the polyethylene glycol solution is 2:20, the volume ratio of the pigment solution to the polyethylene glycol solution is 3:24.

[0022] Preferably, in step S3, the pigment is selected from any one of indigo, madder, β-carotene, sodium copper chlorophyllin, curcumin.

[0023] Preferably, in step S4, the catalyst is p-toluenesulfonic acid and the auxiliary agent is 4-dimethylaminopyridine.

[0024] Preferably, in step S4, the dosage ratio of the cotton fibers, 4,4'-oxydianiline, p-phenylenediamine, catalyst and auxiliary agent is (20 - 30):(0.8 - 1.2):(1.2 - 2):(0.2 - 0.5):(0.05 - 0.1).

[0025] Preferably, in step S10, the heating temperature is 60 - 80°C and the time is 1 - 2 h. For example, the heating temperature is 60°C and the time is 1 h, the heating temperature is 70°C and the time is 1.5 h, the heating temperature is 80°C and the time is 2 h; the grammage of the cotton mesh layer is 400 - 800 g / m 2 .

[0026] Preferably, in step S30, the temperature of the microwave heating treatment is 45 - 55°C and the time is 2 - 10 s. For example, the temperature of the microwave heating treatment is 45°C and the time is 2 s; the temperature of the microwave heating treatment is 50°C and the time is 5 s; the temperature of the microwave heating treatment is 55°C and the time is 10 s.

[0027] The present invention also provides a tampon with a dyed drawstring prepared by the method as described above.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] (1) The tampon provided by the present invention is first treated with H 2 O 2 and zinc chloride, so that the cotton fibers not only have higher hygienic safety, but also improve their physical properties and functionality, meeting the needs of modern consumers for health and environmental protection. Then, bamboo fibers with natural antibacterial properties are used as raw materials to prepare the drawstring, and a fully antibacterial tampon is prepared.

[0030] (2) The present invention heats and treats cotton fibers in an H 2 O 2 solution, which can increase the hydrophilicity and durability of the cotton fibers, making them more efficient in absorbing liquids, able to withstand greater tensile and use pressures, improving the overall water absorption capacity, comfort and mechanical strength of the material. At the same time, it can effectively remove natural oils, waxes and impurities on the surface of the cotton fibers, improving the purity of the fibers, laying a foundation for subsequent antibacterial treatment. After treatment with zinc chloride solution, antibacterial active ingredients will be formed on the surface of the cotton fibers, which can effectively inhibit the growth of bacteria and fungi and reduce the risk of infection.

[0031] (3) The preparation method of the dyed drawstring provided by the present invention first pretreats bamboo fibers with potassium permanganate to improve the strength and toughness of the bamboo fibers. Then, the grafting treatment with silk fibroin endows the bamboo fibers with antibacterial properties, which can effectively inhibit the growth of bacteria and other microorganisms and improve the hygienic safety of the product. Subsequently, dipping in a mixed solution of pigment and polyethylene glycol is carried out to form a film, enhancing the binding force between the pigment and the modified bamboo fibers and improving the color fastness of the bamboo fibers after dyeing. Then, cotton fibers are reacted with 4,4'-biphenyl ether dianhydride and p-phenylenediamine, and a polyimide coating film is formed on its surface at the same time to improve the toughness and antibacterial properties of the cotton fibers. The polyethylene glycol film and the polyimide coating film can crosslink and react to form a network space, further enhancing the mechanical properties of the drawstring. Detailed implementation mode

[0032] The present invention will be further described in detail below through specific preferred embodiments, but the present invention is not limited to the following embodiments.

[0033] It should be noted that unless otherwise specified, the chemical reagents involved in the present invention are all purchased through commercial channels.

[0034] Example 1

[0035] A preparation method of a sanitary tampon with a dyed drawstring includes the following steps:

[0036] (10) Add cotton fibers to an H 2 O 2 solution with a mass concentration of 6%, heat at 70°C for 1.5 h, wash and dry to obtain pretreated cotton fibers. Then, add the pretreated cotton fibers to a zinc chloride solution with a molar concentration of 0.5 mol / L, react at 70°C for 40 min, filter and dry to obtain antibacterial cotton fibers;

[0037] (20) Card the antibacterial cotton fibers. After carding, lay them out into a single layer of cotton fibers, stack the single-layer cotton fibers to obtain a cotton web layer. The gram weight of the cotton web layer is 500 g / m 2 , wrap the cotton web layer with non-woven fabric, and then press it into a strip-shaped fiber layer;

[0038] (30) Fix the dyed drawstring at the central part of the strip-shaped fiber layer, with the end of the drawstring exposed 15 cm outside the strip-shaped fiber layer. Then, curl the strip-shaped fiber layer into a long cylindrical absorber, press and form it in a former, and then carry out microwave heating treatment at 50°C for 6 s to obtain the tampon body of the sanitary tampon;

[0039] (40) Put the tampon body into a catheter to make a sanitary tampon with a dyed drawstring;

[0040] Among them, the preparation method of the dyed drawstring includes the following steps:

[0041] (1) Add 200 mL of deionized water to a reactor containing 100 g of bamboo fiber, then add 0.4 g of potassium permanganate, stir, filter, and dry to obtain pretreated bamboo fiber;

[0042] (2) Add 100 mL of distilled water to a reactor containing 50 g of silk fibroin to obtain a silk fibroin solution. Then immerse the 100 g of pretreated bamboo fiber in the silk fibroin solution, add an EDC / NHS mixed solvent, and then heat in a water bath at 55 °C, stir for 2.5 h, filter, put the filter residue into an oven, keep it at 75 °C for 8 min, and then raise the temperature to 150 °C and bake for 4 min to obtain silk fibroin-grafted bamboo fiber;

[0043] (3) Add 0.2 g of NaS 2 O 4 to 20 mL of DMSO, add NaOH to adjust the pH to 10, stir to dissolve, then add 1 g of pigment powder to obtain a pigment solution. Mix 5 mL of the pigment solution with 100 mL of a 5% polyethylene glycol solution (dissolved in DMSO), add 0.1 g of ascorbic acid, ultrasonically treat to obtain a mixed solution, then immerse 50 g of silk fibroin-grafted bamboo fiber in the mixed solution, ultrasonically treat, filter, wash, and dry to obtain dyed and modified bamboo fiber;

[0044] (4) Place 200 g of cotton fiber in a 10% dilute hydrochloric acid solution, heat and soak for a period of time, then add 1 g of 4,4'-biphenyl ether dianhydride and 1.5 g of p-phenylenediamine, then add 0.4 g of toluenesulfonic acid and 0.5 g of 4-dimethylaminopyridine, heat and stir at 160 °C for 30 min, then filter and dry to obtain modified cotton fiber;

[0045] (5) Open and mix the modified cotton fiber and the dyed and modified bamboo fiber in a ratio of 2:1 by mass on an opener to form mixed fiber, then card, draw, comb, and blend the mixed fiber, and then twist it into a double-strand thread to obtain a dyed drawstring.

[0046] Example 2

[0047] A method for preparing a tampon with a dyed drawstring, comprising the following steps:

[0048] (10) Add cotton fiber to a 6% H 2 O 2 solution, heat at 60 °C for 2 h, then wash and dry to obtain pretreated cotton fiber. Then add the pretreated cotton fiber to a zinc chloride solution with a molar concentration of 0.5 mol / L, react at 60 °C for 60 min, then filter and dry to obtain antibacterial cotton fiber;

[0049] (20) Card the antibacterial cotton fibers. After carding, lay them into a single layer of cotton fibers, stack the single-layer cotton fibers to obtain a cotton web layer, and the gram weight of the cotton web layer is 500 g / m 2 , wrap the cotton web layer with non-woven fabric, and then press it into a strip-shaped fiber layer;

[0050] (30) Fix the dyed drawstring at the central part of the strip-shaped fiber layer. The tail end of the drawstring is exposed 15 cm outside the strip-shaped fiber layer. Then curl the strip-shaped fiber layer to form a long cylindrical absorbent body, and after pressing and forming in a former, perform microwave heating treatment at 45 °C for 6 s to obtain the tampon body of the sanitary tampon;

[0051] (40) Load the tampon body into a catheter to make a sanitary tampon with a dyed drawstring;

[0052] Among them, the preparation method of the dyed drawstring includes the following steps:

[0053] (1) Add 200 mL of deionized water to a reactor containing 100 g of bamboo fibers, then add 0.4 g of potassium permanganate, stir, filter, and dry to obtain pretreated bamboo fibers;

[0054] (2) Add 100 mL of distilled water to a reactor containing 50 g of silk fibroin to obtain a silk fibroin solution. Then immerse the 100 g of pretreated bamboo fibers in the silk fibroin solution, add an EDC / NHS mixed solvent, and then perform water bath heating at 55 °C, stir for 2.5 h, filter, put the filter residue into an oven, keep it warm at 75 °C for 8 min, and then raise the temperature to 150 °C and bake for 4 min to obtain silk fibroin-grafted bamboo fibers;

[0055] (3) Add 0.2 g of NaS to 20 mL of DMSO 2 O 4 , add NaOH to adjust the pH to 10, stir and dissolve, then add 1 g of pigment powder to obtain a pigment solution. Mix 5 mL of the pigment solution with 100 mL of a 5% polyethylene glycol solution (dissolved in DMSO), add 0.1 g of ascorbic acid, perform ultrasonic treatment to obtain a mixed solution, then immerse 50 g of silk fibroin-grafted bamboo fibers in the mixed solution, perform ultrasonic treatment, filter, wash, and dry to obtain dyed and modified bamboo fibers;

[0056] (4) Place 200 g of cotton fibers in a 10% dilute hydrochloric acid solution, heat and soak for a period of time, then add 1 g of 4,4'-biphenyl ether dianhydride and 1.5 g of p-phenylenediamine, then add 0.4 g of toluenesulfonic acid and 0.5 g of 4-dimethylaminopyridine, heat and stir at 160 °C for 30 min, then filter and dry to obtain modified cotton fibers;

[0057] (5) Open and mix the modified cotton fibers and dyed modified bamboo fibers in a mass ratio of 3:2 on an opener to form mixed fibers, then card, draw, comb, and blend the mixed fibers, and then twist them into a double-strand thread to obtain a dyed drawstring.

[0058] Example 3

[0059] A method for preparing a tampon with a dyed drawstring, comprising the following steps:

[0060] (10) Add cotton fibers to an H 2 O 2 solution with a mass concentration of 6%, heat at 80 °C for 1 h, wash and dry to obtain pretreated cotton fibers, then add the pretreated cotton fibers to a zinc chloride solution with a molar concentration of 0.5 mol / L, react at 80 °C for 30 min, filter and dry to obtain antibacterial cotton fibers;

[0061] (20) Card the antibacterial cotton fibers, lay them into a single layer of cotton fibers after carding, stack the single-layer cotton fibers to obtain a cotton web layer, the gram weight of the cotton web layer is 500 g / m 2 , wrap the cotton web layer with non-woven fabric, and then press it into a strip-shaped fiber layer;

[0062] (30) Fix the dyed drawstring at the center of the strip-shaped fiber layer, with the end of the drawstring exposed 15 cm outside the strip-shaped fiber layer, then curl the strip-shaped fiber layer into a long cylindrical absorber, press and form it in a former, and then perform microwave heating treatment at 55 °C for 6 s to obtain the tampon body of the tampon;

[0063] (40) Load the tampon body into a catheter to make a tampon with a dyed drawstring;

[0064] Among them, the preparation method of the dyed drawstring includes the following steps:

[0065] (1) Add 200 mL of deionized water to a reactor containing 100 g of bamboo fibers, then add 0.4 g of potassium permanganate, stir, filter, and dry to obtain pretreated bamboo fibers;

[0066] (2) Add 100 mL of distilled water to a reactor containing 50 g of silk fibroin to obtain a silk fibroin solution, then immerse the 100 g of pretreated bamboo fibers in the silk fibroin solution, add an EDC / NHS mixed solvent, and then heat in a water bath at 55 °C, stir for 2.5 h, filter, put the filter residue into an oven, keep it warm at 75 °C for 8 min, and then raise the temperature to 150 °C and bake for 4 min to obtain silk fibroin-grafted bamboo fibers;

[0067] (3) Add 0.2 g of NaS2O4 to 20 mL of DMSO, add NaOH to adjust the pH to 10, stir to dissolve, then add 1 g of pigment powder to obtain a pigment solution. Mix 5 mL of the pigment solution with 100 mL of a 5% polyethylene glycol solution (dissolved in DMSO), add 0.1 g of ascorbic acid, and perform ultrasonic treatment to obtain a mixed solution. Then immerse 50 g of silk fibroin grafted bamboo fibers in the mixed solution, perform ultrasonic treatment, filter, wash, and dry to obtain dyed and modified bamboo fibers;

[0068] (4) Place 200 g of cotton fibers in a 10% dilute hydrochloric acid solution, heat and immerse for a period of time, then add 1 g of 4,4'-biphenyl ether dianhydride and 1.5 g of p-phenylenediamine, then add 0.4 g of toluene sulfonic acid and 0.5 g of 4-dimethylaminopyridine. After heating and stirring at 160 °C for 30 min, filter and dry to obtain modified cotton fibers;

[0069] (5) Open and mix the modified cotton fibers and the dyed and modified bamboo fibers in a ratio of 3:1 by mass on an opener to form mixed fibers, then card, draw, comb, and blend the mixed fibers, and then twist them into a double-strand thread to obtain a dyed drawstring.

[0070] Comparative Example 1

[0071] A preparation method of a tampon with a dyed drawstring, comprising the following steps:

[0072] (10) Add cotton fibers to a solution of H 2 O 2 with a mass concentration of 6%, heat at 70 °C for 1.5 h, then wash and dry to obtain pretreated cotton fibers;

[0073] (20) Card the pretreated cotton fibers, after carding, lay them into a single layer of cotton fibers, stack the single layer of cotton fibers to obtain a cotton web layer, the gram weight of the cotton web layer is 500 g / m 2 , wrap the cotton web layer with non-woven fabric, and then press it into a strip-shaped fiber layer;

[0074] (30) Fix the dyed drawstring at the center of the strip-shaped fiber layer, with the end of the drawstring exposed 15 cm outside the strip-shaped fiber layer. Then curl the strip-shaped fiber layer into a long cylindrical absorbent body, press and form it in a former, and then perform microwave heating treatment at 50 °C for 6 s to obtain the tampon body of the tampon;

[0075] (40) Place the tampon body into a catheter to make a tampon with a dyed drawstring;

[0076] Among them, the preparation method of the dyed drawstring includes the following steps:

[0077] (1) Add 200 mL of deionized water to a reactor containing 100 g of bamboo fiber, then add 0.4 g of potassium permanganate, stir, filter, and dry to obtain pretreated bamboo fiber;

[0078] (2) Add 100 mL of distilled water to a reactor containing 50 g of silk fibroin to obtain a silk fibroin solution. Then immerse the 100 g of pretreated bamboo fiber in the silk fibroin solution, add an EDC / NHS mixed solvent, and then heat in a water bath at 55 °C, stir for 2.5 h, filter, put the filter residue into an oven, keep it at 75 °C for 8 min, and then raise the temperature to 150 °C and bake for 4 min to obtain silk fibroin-grafted bamboo fiber;

[0079] (3) Add 0.2 g of NaS2O4 to 20 mL of DMSO, add NaOH to adjust the pH to 10, stir to dissolve, then add 1 g of pigment powder to obtain a pigment solution. Mix 5 mL of the pigment solution with 100 mL of a 5% polyethylene glycol solution (dissolved in DMSO), add 0.1 g of ascorbic acid, perform ultrasonic treatment to obtain a mixed solution, then immerse 50 g of silk fibroin-grafted bamboo fiber in the mixed solution, perform ultrasonic treatment, filter, wash, and dry to obtain dyed and modified bamboo fiber;

[0080] (4) Place 200 g of cotton fiber in a 10% dilute hydrochloric acid solution, heat and impregnate for a period of time, then add 1 g of 4,4'-biphenylene ether dianhydride and 1.5 g of p-phenylenediamine, then add 0.4 g of toluenesulfonic acid and 0.5 g of 4-dimethylaminopyridine, heat and stir at 160 °C for 30 min, then filter and dry to obtain modified cotton fiber;

[0081] (5) Open and mix the modified cotton fiber and the dyed and modified bamboo fiber in a ratio of 2:1 on an opener to form a mixed fiber, then card, draw, comb, and blend the mixed fiber, and then twist it into a double-strand thread to obtain a dyed drawstring.

[0082] In Comparative Example 1 compared with Example 1, the pretreated cotton fiber was not impregnated with a zinc chloride solution.

[0083] Comparative Example 2

[0084] A method for preparing a tampon with a dyed drawstring, comprising the following steps:

[0085] (10) Add cotton fiber to a solution of H 2 O 2 with a mass concentration of 6%, heat at 70 °C for 1.5 h, wash and dry to obtain pretreated cotton fiber, then add the pretreated cotton fiber to a zinc chloride solution with a molar concentration of 0.5 mol / L, react at 70 °C for 40 min, filter and dry to obtain antibacterial cotton fiber;

[0086] (20) Card the antibacterial cotton fibers. After carding, lay them into a single layer of cotton fibers, stack the single-layer cotton fibers to obtain a cotton web layer, and the gram weight of the cotton web layer is 500 g / m 2 , wrap the cotton web layer with non-woven fabric, and then press it into a strip-shaped fiber layer;

[0087] (30) Fix the dyed drawstring at the central part of the strip-shaped fiber layer, with the end of the drawstring exposed 15 cm outside the strip-shaped fiber layer. Then curl the strip-shaped fiber layer to form a long cylindrical absorber, and press and form it in a former, followed by microwave heating treatment at 50 °C for 6 s to obtain the tampon body of the sanitary tampon;

[0088] (40) Load the tampon body into a catheter to make a sanitary tampon with a dyed drawstring;

[0089] Among them, the preparation method of the dyed drawstring includes the following steps:

[0090] (1) Add 200 mL of deionized water to a reactor containing 100 g of bamboo fibers, then add 0.4 g of potassium permanganate, stir, filter, and dry to obtain pretreated bamboo fibers;

[0091] (2) Add 0.2 g of NaS to 20 mL of DMSO 2 O 4 , and add NaOH to adjust the pH to 10, stir and dissolve, then add 1 g of pigment powder to obtain a pigment solution. Mix 5 mL of the pigment solution with 100 mL of a 5% polyethylene glycol solution (dissolved in DMSO), add 0.1 g of ascorbic acid, perform ultrasonic treatment to obtain a mixed solution, then immerse 50 g of pretreated bamboo fibers in the mixed solution, perform ultrasonic treatment, filter, wash, and dry to obtain dyed and modified bamboo fibers;

[0092] (3) Place 200 g of cotton fibers in a 10% dilute hydrochloric acid solution, heat and soak for a period of time, then add 1 g of 4,4'-biphenylene ether dianhydride and 1.5 g of p-phenylenediamine, then add 0.4 g of toluenesulfonic acid and 0.5 g of 4-dimethylaminopyridine, heat and stir at 160 °C for 30 min, then filter and dry to obtain modified cotton fibers;

[0093] (4) Open and mix the modified cotton fibers and modified bamboo fibers in a ratio of 2:1 by mass on an opener, then card, draw, comb, and blend the mixed fibers, and then twist them into a double-strand thread to obtain the dyed drawstring.

[0094] Compared with Example 1, the pretreated cotton fibers in Comparative Example 2 were not grafted with silk fibroin.

[0095] Comparative Example 3

[0096] A method for preparing a tampon with a dyed drawstring, comprising the following steps:

[0097] (10) Add cotton fibers to an H 2 O 2 solution with a mass concentration of 6%, heat at 70 °C for 1.5 h, wash and dry to obtain pretreated cotton fibers. Then add the pretreated cotton fibers to a zinc chloride solution with a molar concentration of 0.5 mol / L, react at 70 °C for 40 min, filter and dry to obtain antibacterial cotton fibers;

[0098] (20) Card the antibacterial cotton fibers, lay them out as a single layer of cotton fibers after carding, stack the single-layer cotton fibers to obtain a cotton web layer with a grammage of 500 g / m 2 , wrap the cotton web layer with non-woven fabric, and then press it into a strip-shaped fiber layer;

[0099] (30) Fix the dyed drawstring at the central part of the strip-shaped fiber layer, with the end of the drawstring exposed 15 cm outside the strip-shaped fiber layer. Then curl the strip-shaped fiber layer into a long cylindrical absorber, press and form it in a former, and then perform microwave heating treatment at 50 °C for 6 s to obtain the tampon body of the tampon;

[0100] (40) Load the tampon body into a catheter to make a tampon with a dyed drawstring;

[0101] Among them, the preparation method of the dyed drawstring includes the following steps:

[0102] (1) Add 200 mL of deionized water to a reactor containing 100 g of bamboo fibers, then add 0.4 g of potassium permanganate, stir, filter and dry to obtain pretreated bamboo fibers;

[0103] (2) Add 100 mL of distilled water to a reactor containing 50 g of silk fibroin to obtain a silk fibroin solution. Then immerse the 100 g of pretreated bamboo fibers in the silk fibroin solution, add an EDC / NHS mixed solvent, and then heat in a water bath at 55 °C, stir for 2.5 h, filter, put the filter residue into an oven, keep it warm at 75 °C for 8 min, and then raise the temperature to 150 °C and bake for 4 min to obtain silk fibroin-grafted bamboo fibers;

[0104] (3) Add 0.2 g of NaS to 20 mL of DMSO 2 O 4, and add NaOH to adjust the pH to 10, stir to dissolve, then add 1 g of pigment powder to obtain a pigment solution. Add 0.1 g of ascorbic acid to 5 mL of the pigment solution, and perform ultrasonic treatment to obtain a mixed solution. Then immerse 50 g of silk fibroin-grafted bamboo fibers in the mixed solution, perform ultrasonic treatment, filter, wash, and dry to obtain dyed and modified bamboo fibers;

[0105] (4) Place 200 g of cotton fibers in a 10% by mass dilute hydrochloric acid solution, heat and impregnate for a period of time, then add 1 g of 4,4'-biphenyl ether dianhydride and 1.5 g of p-phenylenediamine, then add 0.4 g of toluenesulfonic acid and 0.5 g of 4-dimethylaminopyridine. After heating and stirring at 160 °C for 30 min, filter and dry to obtain modified cotton fibers;

[0106] (5) Open and mix the modified cotton fibers and the dyed and modified bamboo fibers in a carding machine at a mass ratio of 2:1 to form mixed fibers. Then card, draw, comb, and blend the mixed fibers, and then twist them into a double-strand thread to obtain a dyed drawstring.

[0107] Compared with Example 1, in Comparative Example 3, the silk fibroin-grafted bamboo fibers were not impregnated with the polyethylene glycol mixed solution.

[0108] Comparative Example 4

[0109] A method for preparing a tampon with a dyed drawstring, comprising the following steps:

[0110] (10) Add cotton fibers to an H 2 O 2 solution with a mass concentration of 6%, heat at 70 °C for 1.5 h, wash and dry to obtain pretreated cotton fibers. Then add the pretreated cotton fibers to a zinc chloride solution with a molar concentration of 0.5 mol / L, react at 70 °C for 40 min, filter and dry to obtain antibacterial cotton fibers;

[0111] (20) Card the antibacterial cotton fibers. After carding, lay them out into a single layer of cotton fibers, stack the single-layer cotton fibers to obtain a cotton web layer. The gram weight of the cotton web layer is 500 g / m 2 , wrap the cotton web layer with non-woven fabric, and then press it into a strip-shaped fiber layer;

[0112] (30) Fix the dyed drawstring at the center of the strip-shaped fiber layer, with the tail end of the drawstring exposed 15 cm outside the strip-shaped fiber layer. Then curl the strip-shaped fiber layer into a long cylindrical absorber, press and form it in a former, and perform microwave heating treatment at 50 °C for 6 s to obtain the tampon body of the tampon;

[0113] (40) Load the tampon body into a catheter to make a tampon with a dyed drawstring;

[0114] Among them, the preparation method of the dyed drawstring includes the following steps:

[0115] (1) Add 200 mL of deionized water to a reactor containing 100 g of bamboo fiber, then add 0.4 g of potassium permanganate, stir, filter, and dry to obtain pretreated bamboo fiber;

[0116] (2) Add 100 mL of distilled water to a reactor containing 50 g of silk fibroin to obtain a silk fibroin solution. Then immerse the 100 g of pretreated bamboo fiber in the silk fibroin solution, add an EDC / NHS mixed solvent, and then heat in a water bath at 55 °C, stir for 2.5 h, filter, put the filter residue into an oven, keep it warm at 75 °C for 8 min, and then raise the temperature to 150 °C and bake for 4 min to obtain silk fibroin grafted bamboo fiber;

[0117] (3) Add 0.2 g of NaS2O4 to 20 mL of DMSO, add NaOH to adjust the pH to 10, stir to dissolve, then add 1 g of pigment powder to obtain a pigment solution. Mix 5 mL of the pigment solution with 100 mL of a 5% polyethylene glycol solution (dissolved in DMSO), add 0.1 g of ascorbic acid, and perform ultrasonic treatment to obtain a mixed solution. Then immerse 50 g of silk fibroin grafted bamboo fiber in the mixed solution, perform ultrasonic treatment, filter, wash, and dry to obtain dyed and modified bamboo fiber;

[0118] (4) Open and mix cotton fiber and dyed and modified bamboo fiber in a mass ratio of 2:1 on an opener to form mixed fiber, then card, draw, comb, and blend the mixed fiber, and then twist it into a double-strand thread to obtain a dyed drawstring.

[0119] Compared with Example 1, in Comparative Example 4, the cotton fiber was not subjected to modification treatment.

[0120] The antibacterial properties of the tampons with dyed drawstrings prepared in Examples 1 to 3 and Comparative Examples 1 to 4 were detected. The specific detection method refers to the national standard GB / T 20944.3-2008. The detection results are shown in Table 1.

[0121] Table 1 Antibacterial property test of tampons with dyed drawstrings prepared in Examples 1 to 3 and Comparative Examples 1 to 4

[0122]

[0123]

[0124] The breaking strength of the tampons with dyed drawstrings prepared in Examples 1 to 3 and Comparative Examples 1 to 4 was tested. The test results are shown in Table 2.

[0125] Table 2 Mechanical property results of the dyed drawstring

[0126] Breaking strength (cN / dtex) Elongation at break (%) Example 1 7.25 13.3 Example 2 6.97 13.1 Example 3 7.18 12.7 Comparative Example 1 6.53 9.85 Comparative Example 2 5.87 8.52 Comparative Example 3 4.95 8.24 Comparative Example 4 4.76 7.58

[0127] As can be seen from Table 1 and Table 2 above, compared with the tampons prepared in Comparative Examples 1 to 4, the tampons with dyed drawstrings prepared in the present invention have more excellent antibacterial properties, and their drawstrings have stronger mechanical properties.

[0128] Finally, it should be noted that the above embodiments do not limit the present invention in any form. For those skilled in the art, based on the present invention, some modifications and improvements can be made. Therefore, any modification or improvement made without departing from the spirit of the present invention falls within the scope of protection required by the present invention.

Claims

1. A method for preparing a tampon with a dyed drawstring, characterized in that: The dyed drawstring is prepared by opening, carding, drawing, combing and blending modified cotton fiber and modified bamboo fiber, and then twisting them into double-stranded yarns to obtain the dyed drawstring. The preparation method of the tampon comprises the following steps: S10, adding cotton fiber to H2O2 solution, heating for a period of time, washing and drying to obtain pretreated cotton fiber, then adding the pretreated cotton fiber to zinc chloride solution, reacting at 60-80°C for 0.5-1h, filtering and drying to obtain antibacterial cotton fiber; S20, combing the antibacterial cotton fibers, laying them into a single layer of cotton fibers after combing, stacking the single layers of cotton fibers to obtain a cotton mesh layer, wrapping the cotton mesh layer with a non-woven fabric, and then pressing them into a strip-shaped fiber layer; S30, fixing the dyed drawstring at the center of the strip fiber layer, with the tail end of the drawstring exposed 10-20 cm outside the strip fiber layer, then curling the strip fiber layer to form a long cylindrical absorbent body, pressing and molding in a former, and then performing microwave heating treatment to obtain a tampon body; S40, placing the tampon body into the catheter to produce a tampon with a dyed drawstring.

2. The method for preparing a tampon with a dyed drawstring according to claim 1, characterized in that: The preparation method of the dyed drawstring comprises the following steps: S1, adding deionized water to a reactor containing bamboo fibers, then adding potassium permanganate, stirring, filtering, and drying to obtain pretreated bamboo fibers; S2, adding distilled water to the reactor containing silk fibroin to obtain a silk fibroin solution, then immersing the pretreated bamboo fiber in the silk fibroin solution, adding EDC / NHS mixed solvent, then heating in a water bath, stirring for a period of time and filtering, placing the filter residue in an oven for baking, and obtaining silk fibroin grafted bamboo fiber; S3, adding NaOH and NaS2O4 to DMSO, stirring to dissolve, then adding pigment powder to obtain a pigment solution, mixing the pigment solution with a polyethylene glycol solution dissolved in DMSO, adding ascorbic acid, ultrasonically treating to obtain a mixed solution, then immersing the silk fibroin-grafted bamboo fiber in the mixed solution, ultrasonically treating, filtering, washing, and drying to obtain a dyed modified bamboo fiber; S4, placing the cotton fiber in an acidic solution, heating and soaking for a period of time, then adding 4,4'-biphenyl ether dianhydride and p-phenylenediamine, then adding a catalyst and an auxiliary agent, heating and stirring for a period of time, filtering, and drying to obtain modified cotton fiber; S5. Modified cotton fiber and dyed modified bamboo fiber are opened and mixed in a mass ratio of (3-6): (1-2) on an opening machine to form mixed fibers, and then the mixed fibers are carded, drawn, combed and blended, and then twisted into two-ply yarns to obtain dyed draw ropes.

3. The method for preparing a tampon with a dyed drawstring according to claim 2, characterized in that: In step S1, the drying temperature is 40-50°C.

4. The method for preparing a tampon with a dyed drawstring according to claim 2, characterized in that: In step S2, the water bath heating temperature is 50-60°C, and the stirring time is 2-3h; the baking step is: keeping warm at 70-80°C for 5-10min, and then heating to 140-160°C and baking for 3-5min.

5. The method for preparing a tampon with a dyed drawstring according to claim 2, characterized in that: In step S3, the mass ratio of DMSO to pigment powder is 15-25:1, the mass concentration of polyethylene glycol in the polyethylene glycol solution is 5%-10%, and the volume ratio of the pigment solution to the polyethylene glycol solution is (1-3):(16-24).

6. The method for preparing a tampon with a dyed drawstring according to claim 2, characterized in that: In step S4, the catalyst is p-toluenesulfonic acid, and the auxiliary agent is 4-dimethylaminopyridine.

7. The method for preparing a tampon with a dyed drawstring according to claim 2, characterized in that: In step S4, the usage ratio of the cotton fiber, 4,4'-biphenyl ether dianhydride, p-phenylenediamine, catalyst and auxiliary agent is (20-30): (0.8-1.2): (1.2-2): (0.2-0.5): (0.05-0.1).

8. The method for preparing a tampon with a dyed drawstring according to claim 1, characterized in that: In step S10, the heating temperature is 60-80°C for 1-2 hours; the weight of the cotton mesh layer is 400-800 g / m 2 .

9. The method for preparing a tampon with a dyed drawstring according to claim 1, characterized in that: In step S30, the microwave heating treatment is performed at a temperature of 45 to 55°C and for a time of 2 to 10 seconds.

10. A tampon with a dyed drawstring prepared by the method according to any one of claims 1 to 9.

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