A bacteriostatic absorbent core and a method of making the same

Abstract

This invention relates to the field of hygiene products, providing an antibacterial absorbent core and its preparation method, solving the problem that existing antibacterial absorbent cores lack anticoagulant function and that Ag is added during coating. + This facilitates its migration into the human body or the addition of Ag. + The method leads to a relatively poor antibacterial effect; the antibacterial absorbent core includes a lower nonwoven fabric layer, a SAP and modified PET fiber mixture layer, an sizing layer and an upper nonwoven fabric layer stacked from bottom to top; wherein the SAP and modified PET fiber mixture layer is obtained by mixing SAP and modified PET fibers and then negative pressure adsorption, conveying and molding, and the modified PET fibers include the following raw materials: acetone, anhydrous ethanol, PET fibers, sodium periodate, dopamine hydrochloride, N,N-dimethylformamide, propylene glycol methyl ether, silver ammonia solution, azodiol enamine, hydrochloric acid, N,N-dimethylformamide and deionized water.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of sanitary products, in particular to a bacteriostatic absorbent core and a preparation method thereof. BACKGROUND

[0002] Sanitary napkins are designed for women to use during their menstrual period, and their core function is to absorb menstrual blood and keep the private parts dry. With the progress of science and technology, the design and materials of sanitary napkins are constantly being innovated and improved to enhance the comfort of users and the functionality of the products. Among the many improvements, one important direction is to enhance the antibacterial function of sanitary napkins. Sanitary napkins are prone to becoming a culture dish for bacteria during a woman's menstrual period, because menstrual blood contains rich nutrients, combined with the warm and humid environment of the private parts, providing suitable conditions for the growth of bacteria. This function is mainly achieved by adding substances with antibacterial properties to the sanitary napkins. These substances can effectively reduce the growth of bacteria, thereby reducing the risk of infection for the user. Although some sanitary napkins claim to have antibacterial effects, the actual effect may vary from product to product. Some products may not provide sufficient antibacterial protection, or the antibacterial ingredients may cause allergic reactions in some women.

[0003] Metal ions have antibacterial effects on a variety of bacteria, fungi, and viruses, and are a broad-spectrum antibacterial agent. Its antibacterial effect is long-lasting, and it can still maintain a certain antibacterial activity even after long-term use. Silver ions have low toxicity to human cells and do not cause damage to normal cells, so they are highly safe and are widely used in water treatment, skincare products, daily necessities, medical devices, and other fields. For example, the international brand Hakunon has launched antibacterial sanitary napkins that claim to use a silver ion antibacterial system.

[0004] There are generally two ways to add silver ion materials. One is to apply a silver ion antibacterial finishing agent after the fiber material is formed, and the other is to load silver ions or silver nanoparticles onto different substrates to form a composite material to form an antibacterial master batch, which is mixed into the fiber during formation. The first treatment method is a dissolved antibacterial method. If silver ions migrate to the human body and are used repeatedly or in excess, it may cause an increase in the pH value in the human body, leading to electrolyte disorders. In addition, some people may be allergic to silver ions, causing skin redness, itching, and other allergic symptoms; the second treatment method is a non-dissolved antibacterial method. Silver ions or other metal ions are coated in the fibers and cannot fully function, requiring higher addition amounts, and there may still be a dissolution problem in actual application.

[0005] Chinese Patent Application No. 202011636229.6 discloses a kind of high efficiency and quick-acting antibacterial composite fiber and its preparation method, it is a kind of ES skin-core composite fiber, skin layer contains PE non-metallic doped zinc oxide semiconductor antibacterial masterbatch, core layer contains PET or PP metal doped zinc oxide semiconductor antibacterial masterbatch;Two kinds of masterbatch are added to the side of skin layer and core layer melt pipeline respectively, through double screw extrusion, then through composite spinning pack, spray, cooling, oiling, winding, stretching, crimping and shaping process, obtain high efficiency and quick-acting antibacterial composite fiber with good physical properties.But the fiber needs higher antibacterial ion addition amount, and its antibacterial effect is relatively poor under the condition of using the same antibacterial ion addition amount.

[0006] Chinese Patent Application No. 202210238576.6 discloses a kind of nano-silver antibacterial sanitary napkin, which is composed of surface layer, nano-silver chip, absorbing layer, bottom film, release paper layer, envelope and fast and easy paste from top to bottom. The nano-silver chip is obtained by treating non-woven fabric with antibacterial finishing and hydrophilic finishing. Compared with the prior art, the invention uses cocoa bean shell, a byproduct discarded in cocoa processing, as raw material, reducing waste and expanding the application field of cocoa bean shell. The cocoa bean shell extract has good antibacterial and antioxidant effects, and can reduce silver ions to nano-silver particles, which together with nano-silver particles in the sanitary napkin exhibit excellent antibacterial performance. However, the sanitary napkin of the invention does not have anticoagulant function, and the adhesion of the antibacterial finishing liquid on the surface of the non-woven fabric is relatively poor. SUMMARY

[0007] Therefore, to solve the problems of the prior art, the present application provides a kind of antibacterial absorption core and its preparation method, which solves the problem of the prior art that the antibacterial absorption core does not have anticoagulant function, and the coating method of Ag + results in greater cytotoxicity or the coating method of Ag + results in relatively poor antibacterial effect.

[0008] To achieve the above-mentioned purposes, the present application adopts the following technical solutions:

[0009] An antibacterial absorption core, comprising a lower non-woven fabric layer, a SAP and modified PET fiber mixture layer, a sizing layer and an upper non-woven fabric layer arranged in order from bottom to top; wherein the SAP and modified PET fiber mixture layer is obtained by negative pressure adsorption, transportation and molding of the mixture of SAP and modified PET fiber, and the modified PET fiber comprises the following raw materials: acetone, anhydrous ethanol, PET fiber, sodium periodate, dopamine hydrochloride, N,N-dimethylformamide, propylene glycol methyl ether, silver amide solution, azobenzene diol enamine, hydrochloric acid, N,N-dimethylformamide and deionized water.

[0010] Further, the modified PET fiber has a double helix structure.

[0011] Further, the modified PET fibers constitute a single column from top to bottom, and the volume presents a large-small-large structure in turn.

[0012] Further, the SAP is distributed in peaks and troughs between the upper and lower adjacent layers of the double helix structure.

[0013] Further, the modified PET fibers are in a wave shape.

[0014] A preparation method of a bacteriostatic absorption core, comprising the following steps:

[0015] S1, preparation of P solution: according to the volume ratio of acetone and anhydrous ethanol of 3-4:1, mix acetone and anhydrous ethanol uniformly, then add P powder, and prepare P solution with a concentration of 0.1-1g / ml;

[0016] S2, preparation of modified PET: immerse PET fibers in an ethanol solution with a concentration of 30-45%, ultrasonic treatment for 30-45min, then dry, then immerse the dried PET fibers in the P solution obtained in step S1, add 1-5 parts by weight of sodium metaperiodate, stir for 1-2h, then vacuum dry at 40-45℃ for 10-12h, pour out the supernatant, then dry at 100-120℃ for 1-2h, and obtain modified PET;

[0017] S3, preparation of a bacteriostatic absorption core:

[0018] a, twist the modified PET obtained in step S2 to obtain modified PET fibers with a double helix structure, then control the auxiliary airflow to make the modified PET fibers constitute a single column from top to bottom, and the volume presents a large-small-large structure, roll out the lower non-woven fabric and apply glue to the upper surface of the lower non-woven fabric;

[0019] b, mix SAP and the modified PET fibers, then perform negative pressure adsorption, conveying, and molding, and then composite to the surface of the lower non-woven fabric;

[0020] c, roll out the upper non-woven fabric and apply glue to the lower surface of the upper non-woven fabric, then composite the upper non-woven fabric to the product in step b, and cut to obtain the bacteriostatic absorption core;

[0021] The preparation method of the P powder is as follows:

[0022] I. Under the protection of high-purity nitrogen, dopamine hydrochloride, N,N-dimethylformamide and propylene glycol methyl ether are mixed in a solid-liquid ratio of 3-5:20:20, respectively, and the mixture is stirred for 1-2 hours to dissolve the dopamine hydrochloride, obtaining a first mixed solution;

[0023] II. 1-3 parts of silver amide solution is added to the first mixed solution obtained in step I, and the temperature is raised to 60-70 DEG C, then 10-15 parts of azobisglycol ketone amine is added, and the temperature is raised to 100-120 DEG C, and the reaction is carried out for 48-50 hours, obtaining a second mixed solution;

[0024] III. The second mixed solution obtained in step II is precipitated in hydrochloric acid solution with pH of 1-1.5, and the precipitate is collected and dissolved in N,N-dimethylformamide, then precipitated in hydrochloric acid solution with pH of 1-1.5, and the above process is repeated for 2-3 times, then dialysis treatment is carried out with dialysis bag with molecular weight cut-off of 3000-3500 Da, and then vacuum drying is carried out, obtaining P powder.

[0025] Further, the dialysis treatment is: first dialysis purification in N,N-dimethylformamide solution for 72-75 hours, and then dialysis purification in deionized water for 72-75 hours, and the dialysis solution is replaced every 6-8 hours.

[0026] Further, the twisting treatment is: using air jet spinning machine, high-speed airflow is used to realize twisting, and the twist is 2500-4500T·m -1 , the main airflow speed is 50-200 m / s, and the auxiliary airflow speed is 10-50 m / s.

[0027] Further, the ultrasonic treatment is carried out in an ultrasonic cleaner, and the ultrasonic power is 100-120 HZ.

[0028] Further, the shape of the modified PET fiber is wavy.

[0029] By adopting the foregoing technical scheme, the application has the following beneficial effects:

[0030] 1. Dopamine (DA) is a typical catechol compound that inhibits bacterial growth and reproduction. It increases bacterial cell membrane permeability, causing leakage of intracellular proteins and carbohydrates, thus disrupting bacterial metabolism. Using dopamine hydrochloride (DA) as a raw material, under the conditions of adding N,N-dimethylformamide and propylene glycol methyl ether, DA undergoes self-polymerization to form polydopamine (PDA). Silver ions have antibacterial effects against various bacteria, fungi, and viruses, making them a broad-spectrum antibacterial agent with long-lasting antibacterial effects. The catechol groups abundant in PDA form a strong coordination interaction with silver ions, constructing a stable metal-phenolic coordination network, which has a synergistic effect on antibacterial activity, resulting in a more stable and longer-lasting antibacterial effect. Furthermore, the multi-hydroxyl structure of PDA gives it a certain reducing property, enabling it to convert Ag... + Restore to Ag, avoid Ag + It migrates into the human body and produces cytotoxicity.

[0031] 2. PDA also possesses superhydrophilic properties, enabling it to rapidly absorb water and form a water molecule layer on its surface. This water molecule layer effectively blocks direct contact between proteins and the material surface, thereby reducing non-specific adhesion of menstrual blood. Simultaneously, the catechol groups on the PDA form covalent bonds with the electrophilic centers of azodiol enamines (NONOates), achieving chemical bonding and providing anticoagulant properties. This enhances the core's absorption efficiency of menstrual blood. When NONOates encounter menstrual blood, they hydrolyze to generate two molecules of NO. The release of NO is independent of specific metabolic or redox reactions. The generation of NO activates platelets, causing platelet dysfunction, initiating coagulation cascade reactions, and reducing circulating coagulation factor levels, thus triggering coagulation disorders and maintaining menstrual blood fluidity. This mechanism provides an effective anticoagulant strategy for PDA coatings, enhancing the biocompatibility of the material in contact with menstrual blood, thereby increasing the absorption efficiency of menstrual blood by SAP.

[0032] 3. Solution P is Ag +, NONOates respectively after the reaction of PDA to form a mixture, namely P, the effective component of the complex is Ag / NONOates / PDA, the PET fiber is soaked in the P solution, the rich catechol functional group in the PDA can spontaneously form a hydrogen bond with the hydroxyl group on the surface of the PET fiber, and strong adhesion is realized on the surface of the PET fiber, so that Ag / NONOates / PDA and the PET fiber can be firmly bonded without introducing other adhesives, thereby reducing the use of other chemicals, improving the biocompatibility of the core, and reducing the risk of allergy and irritation; meanwhile, the PET fiber adopts a stretch textured yarn, and a wave-shaped microstructure is formed through a pre-stretching technology to improve the adhesion of Ag / NONOates / PDA on the surface of the PET fiber, specifically, in the fiber false twisting process, the yarn is twisted through the interaction between the friction unit and the false twister, and the twisting produces a unique curling shape, and the fiber is soaked in the P solution during the cooling and setting stage, and the modified PET fiber obtained after treatment has hydrophilicity that meets the absorption requirements and does not need to be treated with a hydrophilic oil agent.

[0033] 4、The modified PET fiber after the twisting treatment has a double helix structure, which constitutes a single column with a large-small-large structure from top to bottom, so that the SAP is distributed in the upper and lower adjacent layers in staggered arrangement, uniform dispersion is realized, and the SAP can be fully absorbed when the blood flows in; the double helix structure can improve the bulkiness and resilience of the core, which is helpful for the rapid penetration and diffusion of the menstrual blood, and further improves the absorption efficiency of the core. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 is a structure diagram of a bacteriostatic absorption core in the embodiment of the application;

[0035] Explanation of reference numerals in the drawing: 1-modified PET fiber, 2-SAP. DETAILED DESCRIPTION

[0036] Embodiment 1

[0037] A preparation method of a bacteriostatic absorption core, comprising the following steps:

[0038] (1) Preparation of P solution

[0039] (1-1) Preparation of P powder

[0040] I. Under the protection of high-purity nitrogen, dopamine hydrochloride, N,N-dimethylformamide and propylene glycol methyl ether are mixed in the order of 3:20:20 in the ratio of solid-liquid ratio, and the mixture is stirred for 1 h, so that the dopamine hydrochloride is fully dissolved, and a first mixed solution is obtained;

[0041] II. To the first mixed solution obtained in step I, 1 part by weight of silver amide solution is added, and the temperature is raised to 60°C, then 10 parts by weight of azobenzene diol enamine is added, and the temperature is raised to 100°C, and constant temperature reaction is carried out for 48h, and after the reaction is completed, a second mixed solution is obtained;

[0042] III. The second mixed solution obtained in step II is precipitated once in a hydrochloric acid solution with a pH of 1, the precipitate is collected, the precipitate is dissolved in N,N-dimethylformamide, and then precipitated twice in a hydrochloric acid aqueous solution with a pH of 1, the above process is repeated 3 times, then dialysis treatment is carried out using a dialysis bag with a molecular weight cut-off of 3000 Da, first dialysis purification in N,N-dimethylformamide solution for 72h, then dialysis purification in deionized water for 72h, the dialysate is replaced every 6h, and then vacuum drying is carried out, to obtain P powder;

[0043] (1-2) Preparation of P solution

[0044] The acetone and anhydrous ethanol are mixed uniformly according to a volume ratio of 3:1 of acetone to anhydrous ethanol, then the P powder is added, and a P solution with a concentration of 0.1g / ml is prepared;

[0045] (2) Preparation of modified PET

[0046] The PET fiber is immersed in an ethanol solution with a concentration of 30%, ultrasonic treatment is carried out in an ultrasonic cleaner, the ultrasonic power is 100HZ, the time is 30min, and then drying is carried out, the dried PET fiber is immersed in the P solution obtained in step (1), 1 part by weight of sodium periodate is added, stirring reaction is carried out for 1h, then vacuum drying is carried out at 40°C for 10h, the supernatant is poured out, and then drying is carried out at 100°C for 1h, to obtain modified PET;

[0047] (3) Preparation of antibacterial absorption core

[0048] (3-1) The modified PET obtained in step (2) is twisted to obtain modified PET fiber with double helix structure, and auxiliary air flow control is used to make the modified PET fiber form a single column with a large-small-large structure from top to bottom, the twisting treatment is carried out using an air jet spinning machine, high-speed airflow is used to realize twisting, and the twist is 2500T·m -1 , the main airflow speed is 50m / s, the auxiliary airflow speed is 10m / s, and the shape of the modified PET fiber is wavy, the lower non-woven fabric is unwound and transported, and glue is applied to the upper surface of the lower non-woven fabric;

[0049] (3-2) The SAP and the modified PET fiber are mixed, then negative pressure adsorption, transportation and molding are carried out, and then the composite is formed on the surface of the lower non-woven fabric;

[0050] (3-3) The upper non-woven fabric is unwound and transported, and sizing is applied to the lower surface of the upper non-woven fabric, and then the upper non-woven fabric is combined with the product in step (3-2), and after slitting, the antibacterial absorbent core body is obtained.

[0051] The antibacterial absorbent core body comprises, from bottom to top, a lower non-woven fabric layer, an SAP and modified PET fiber mixture layer, a sizing layer and an upper non-woven fabric layer; wherein the SAP and modified PET fiber mixture layer is obtained by mixing SAP and modified PET fibers under negative pressure adsorption, transportation and molding, and the modified PET fiber comprises the following raw materials: acetone, anhydrous ethanol, PET fiber, sodium periodate, dopamine hydrochloride, N,N-dimethylformamide, propylene glycol methyl ether, silver ammine solution, azo glycol enamine, hydrochloric acid, N,N-dimethylformamide, deionized water;

[0052] The modified PET fiber has a double helix structure, and the modified PET fiber forms a single column with a volume that presents a large-small-large structure from top to bottom, the SAP is distributed in peaks and valleys between adjacent layers of the double helix structure, and the modified PET fiber has a wave shape.

[0053] Example 2

[0054] A method for preparing an antibacterial absorbent core body comprises the following steps:

[0055] (1) Preparation of P solution

[0056] (1-1) Preparation of P powder

[0057] I. Under the protection of high-purity nitrogen, dopamine hydrochloride, N,N-dimethylformamide and propylene glycol methyl ether were mixed in a solid-liquid ratio of 1:5:5, and the mixture was stirred for 1.5 h to make the dopamine hydrochloride fully dissolved, to obtain a first mixture;

[0058] II. 2 parts by weight of silver ammine solution was added to the first mixture obtained in step I, and the temperature was raised to 65°C, then 12 parts by weight of azo glycol enamine was added, and the temperature was raised to 110°C, and the reaction was kept at this temperature for 49 h, and then a second mixture was obtained.

[0059] III. The second mixed solution obtained in step II is precipitated once in a hydrochloric acid solution with a pH of 1.2, the precipitate is collected, the precipitate is dissolved in N,N-dimethylformamide, and then precipitated twice in a hydrochloric acid aqueous solution with a pH of 1.2, the above process is repeated 3 times, and then dialysis treatment is performed using a dialysis bag with a molecular weight cut-off of 3200 Da, first dialysis purification in an N,N-dimethylformamide solution for 73 h, then dialysis purification in deionized water for 73 h, the dialysate is replaced every 7 h, and then vacuum drying is performed to obtain P powder;

[0060] (1-2) Preparation of P solution

[0061] The P solution with a concentration of 0.5 g / ml is prepared by mixing acetone and anhydrous ethanol in a volume ratio of 3.5:1, and then adding the P powder;

[0062] (2) Preparation of modified PET

[0063] The PET fiber is immersed in an ethanol solution with a concentration of 30%, and ultrasonic treatment is performed in an ultrasonic cleaner with an ultrasonic power of 110 HZ for 35 min, and then dried. The dried PET fiber is immersed in the P solution obtained in step (1), 3 parts by weight of sodium periodate is added, and stirring reaction is performed for 1.5 h, and then vacuum drying is performed at 42°C for 11 h, the supernatant is poured out, and then drying is performed at 110°C for 1.5 h to obtain the modified PET;

[0064] (3) Preparation of antibacterial absorption core

[0065] (3-1) The modified PET obtained in step (2) is twisted to obtain a modified PET fiber with a double helix structure, and the modified PET fiber is formed into a single column with a large-small-large structure from top to bottom by controlling the auxiliary air flow. The twisting treatment is performed by using an air jet spinning machine to realize twisting by high-speed air flow, and the twist is 3000 T·m -1 , the main air flow speed is 100 m / s, the auxiliary air flow speed is 30 m / s, and the shape of the modified PET fiber is wavy. The lower non-woven fabric is unwound and transported, and glue is applied to the upper surface of the lower non-woven fabric;

[0066] (3-2) The SAP and the modified PET fiber are mixed, and then subjected to negative pressure adsorption, transportation, and molding, and then compounded onto the surface of the lower non-woven fabric;

[0067] (3-3) The upper non-woven fabric is unwound and transported, and glue is applied to the lower surface of the upper non-woven fabric, and then the upper non-woven fabric is compounded onto the product in step (3-2), and then cut to obtain the antibacterial absorption core.

[0068] The bacteriostatic absorption core comprises, from bottom to top, a lower non-woven fabric layer, a SAP and modified PET fiber mixture layer, a sizing layer and an upper non-woven fabric layer; wherein the SAP and modified PET fiber mixture layer is obtained by negative pressure adsorption, transportation and molding of the mixture of SAP and modified PET fiber, and the modified PET fiber comprises the following raw materials: acetone, anhydrous ethanol, PET fiber, sodium periodate, dopamine hydrochloride, N,N-dimethylformamide, propylene glycol methyl ether, silver amide solution, azobisglycol amine, hydrochloric acid, N,N-dimethylformamide and deionized water.

[0069] The modified PET fiber is a double helix structure, the modified PET fiber forms a single column with a volume that presents a large-small-large structure from top to bottom, the SAP is distributed in peaks and valleys between the upper and lower adjacent layers of the double helix structure, and the shape of the modified PET fiber is wavy.

[0070] Embodiment 3

[0071] A preparation method of a bacteriostatic absorption core comprises the following steps:

[0072] (1) Preparation of P solution

[0073] (1-1) Preparation of P powder

[0074] I. Under high-purity nitrogen protection, dopamine hydrochloride, N,N-dimethylformamide and propylene glycol methyl ether are mixed in a solid-liquid ratio of 1:4:4, and the mixture is stirred for 2 hours to make the dopamine hydrochloride fully dissolved, to obtain a first mixed solution;

[0075] II. 3 parts by weight of silver amide solution is added to the first mixed solution obtained in step I, and the temperature is raised to 70°C, then 15 parts by weight of azobisglycol amine is added, the temperature is raised to 120°C, and the reaction is kept at a constant temperature for 50 hours, to obtain a second mixed solution;

[0076] III. The second mixed solution obtained in step II is precipitated once in a hydrochloric acid solution with a pH of 1.5, the precipitate is collected, the precipitate is dissolved in N,N-dimethylformamide, and then precipitated twice in a hydrochloric acid aqueous solution with a pH of 1.5, the above process is repeated for 3 times, then the dialysis bag with a molecular weight cut-off of 3500 Da is used for dialysis treatment, first dialysis purification in N,N-dimethylformamide solution for 75 hours, then dialysis purification in deionized water for 75 hours, the dialysis liquid is replaced every 8 hours, and then vacuum drying is performed, to obtain P powder;

[0077] (1-2) Preparation of P solution

[0078] The P powder is added into a mixture of acetone and anhydrous ethanol in a volume ratio of 4:1 to prepare a P solution with a concentration of 1 g / ml;

[0079] (2) Preparation of modified PET

[0080] The PET fiber is immersed in an ethanol solution with a concentration of 30%, and then is subjected to ultrasonic treatment in an ultrasonic cleaner at an ultrasonic power of 120 HZ for 45 min. The treated PET fiber is then dried and immersed in the P solution obtained in step (1). 5 parts by weight of sodium periodate is added, and the mixture is stirred for 2 h. The mixture is then dried at 45°C under vacuum for 12 h. The supernatant is poured out, and the mixture is dried at 120°C for 2 h to obtain the modified PET.

[0081] (3) Preparation of the antibacterial absorbent core

[0082] (3-1) The modified PET obtained in step (2) is twisted to obtain a modified PET fiber with a double helix structure. The modified PET fiber is formed into a single column with a large-small-large structure from top to bottom by controlling the auxiliary airflow. The twisting is performed using an air jet spinning machine at a high speed airflow with a twist of 4500 T·m -1 , a main airflow speed of 200 m / s, and an auxiliary airflow speed of 50 m / s. The modified PET fiber has a wave shape. The lower non-woven fabric is unwound and transported, and glue is applied to the upper surface of the lower non-woven fabric.

[0083] (3-2) The SAP and the modified PET fiber are mixed, and then are subjected to negative pressure adsorption, transportation, and molding. The mixture is then compounded onto the surface of the lower non-woven fabric.

[0084] (3-3) The upper non-woven fabric is unwound and transported, and glue is applied to the lower surface of the upper non-woven fabric. The upper non-woven fabric is then compounded onto the product obtained in step (3-2). After being cut, the antibacterial absorbent core is obtained.

[0085] The antibacterial absorbent core comprises, from bottom to top, a lower non-woven fabric layer, a mixture layer of SAP and modified PET fiber, a glue application layer, and an upper non-woven fabric layer. The mixture layer of SAP and modified PET fiber is obtained by mixing the SAP and the modified PET fiber, and then subjecting the mixture to negative pressure adsorption, transportation, and molding. The modified PET fiber comprises the following raw materials: acetone, anhydrous ethanol, PET fiber, sodium periodate, dopamine hydrochloride, N,N-dimethylformamide, propylene glycol methyl ether, silver ammine solution, azobisglycol amine, hydrochloric acid, N,N-dimethylformamide, and deionized water.

[0086] The modified PET fiber is a double helix structure, the modified PET fiber forms a single column from top to bottom, and the volume of the structure presents a large-small-large structure in turn, the SAP is distributed in the upper and lower adjacent layers of the double helix structure, and the shape of the modified PET fiber is a wave shape.

[0087] Example 4

[0088] The modified PET fiber obtained in Example 1 is carded by a non-woven fabric machine, and a modified PET non-woven fabric is prepared by a hot air process.

[0089] Example 5

[0090] The modified PET fiber obtained in Example 2 is carded by a non-woven fabric machine, and a modified PET non-woven fabric is prepared by a hot air process.

[0091] Example 6

[0092] The modified PET fiber obtained in Example 3 is carded by a non-woven fabric machine, and a modified PET non-woven fabric is prepared by a hot air process.

[0093] Comparative Example 1

[0094] The PET fiber is immersed in a bacteriostatic finishing liquid for 60 min, the bacteriostatic finishing liquid includes the following raw materials by weight: 30 parts by weight of silver nitrate, 1000 parts of deionized water; then the PET fiber is baked at 60℃ for 2 min, and then the PET fiber is carded by a non-woven fabric machine, and a dissolving bacteriostatic non-woven fabric is prepared by a hot air process.

[0095] Comparative Example 2

[0096] The PET fiber is immersed in a bacteriostatic finishing liquid for 60 min, the bacteriostatic finishing liquid includes the following raw materials by weight: 50 parts by weight of silver nitrate, 1000 parts of deionized water; then the PET fiber is baked at 60℃ for 2 min, and then the PET fiber is carded by a non-woven fabric machine, and a dissolving bacteriostatic non-woven fabric is prepared by a hot air process.

[0097] Comparative Example 3

[0098] The PET fiber is immersed in a bacteriostatic finishing liquid for 60 min, the bacteriostatic finishing liquid includes the following raw materials by weight: 80 parts by weight of silver nitrate, 1000 parts of deionized water; then the PET fiber is baked at 60℃ for 2 min, and then the PET fiber is carded by a non-woven fabric machine, and a dissolving bacteriostatic non-woven fabric is prepared by a hot air process.

[0099] Comparative Example 4

[0100] Take 30 parts by weight of PET particles, 30 parts by weight of silver ions, after melting the PET particles, add the silver ions, stir with a stirrer, make antibacterial material master batch, according to the weight ratio of antibacterial material master batch and PET particles is 3:97, melt the antibacterial material master batch and PET particles, stir with a stirrer, make antibacterial fiber through fiber drawing machine, make non-dissolved antibacterial non-woven fabric through hot air process after carding the antibacterial fiber into a net through non-woven fabric machine.

[0101] Comparative example 5

[0102] Take 30 parts by weight of PET particles, 30 parts by weight of silver ions, after melting the PET particles, add the silver ions, stir with a stirrer, make antibacterial material master batch, according to the weight ratio of antibacterial material master batch and PET particles is 3:97, melt the antibacterial material master batch and PET particles, stir with a stirrer, make antibacterial fiber through fiber drawing machine, make non-dissolved antibacterial non-woven fabric through hot air process after carding the antibacterial fiber into a net through non-woven fabric machine.

[0103] Comparative example 6

[0104] Take 30 parts by weight of PET particles, 30 parts by weight of silver ions, after melting the PET particles, add the silver ions, stir with a stirrer, make antibacterial material master batch, according to the weight ratio of antibacterial material master batch and PET particles is 3:97, melt the antibacterial material master batch and PET particles, stir with a stirrer, make antibacterial fiber through fiber drawing machine, make non-dissolved antibacterial non-woven fabric through hot air process after carding the antibacterial fiber into a net through non-woven fabric machine.

[0105] The test data of example 4 to example 6, comparative example 1 to comparative example 6 are shown in table 1. Among them, the E. coli inhibition rate is > 26%, the product has antibacterial effect; the cell viability value is > 70%, the product has no cytotoxicity.

[0106] Table 1

[0107]

[0108] As can be seen from table 1, the modified PET non-woven fabric prepared according to the technical scheme of the present application has an antibacterial rate of more than 99.6%, good antibacterial effect, and good cell activity, which is mild and non-irritating to the human body.

[0109] From the comparative example 1 to comparative example 3, the cell viability of the dissolution antibacterial nonwoven fabric is the highest of 60%, and the antibacterial rate is only 59.5% at this time; by increasing the silver ion content in the antibacterial finishing liquid, the antibacterial rate is increased to 72.3%, and the cell viability is reduced to 53%; when the antibacterial rate is increased to 91.5%, the cell viability is reduced to 33%, and the product has cytotoxicity, which indicates that after the fiber material is formed, the method of coating the silver ion antibacterial finishing agent has greater cytotoxicity.

[0110] From the comparative example 4 to comparative example 6, the cell viability of the non-dissolution antibacterial nonwoven fabric is the highest of 93%, but the antibacterial rate is only 3% at this time, and the product has no antibacterial effect; by increasing the content of the antibacterial material master batch in the PET particles, the antibacterial rate is increased to 13%, and the cell viability is reduced to 80%, and the product has no antibacterial effect; when the antibacterial rate is increased to 30%, the cell viability is reduced to 59%, and the product has a certain antibacterial effect, but the product has cytotoxicity, which indicates that the silver ion cannot be fully played by the way of being coated in the fiber, and the antibacterial effect is poor.

[0111] Although the present application is specifically shown and described in connection with preferred embodiments, it will be clear to those skilled in the art that various changes in form and details can be made therein without departing from the spirit and scope of the application as defined in the appended claims.

Claims

1. A bacteriostatic absorbent core, characterized in that, The absorbent core comprises, from bottom to top, a lower non-woven fabric layer, a SAP and modified PET fiber mixture layer, a sizing layer, and an upper non-woven fabric layer; the SAP and modified PET fiber mixture layer is obtained by negative pressure adsorption, transportation and molding of the mixture of SAP and modified PET fiber; the modified PET fiber comprises the following raw materials: acetone, anhydrous ethanol, PET fiber, sodium periodate, dopamine hydrochloride, N,N-dimethylformamide, propylene glycol methyl ether, silver amide solution, azo glycol enamine, hydrochloric acid, N,N-dimethylformamide, and deionized water; and the preparation process of the antibacterial absorbent core is as follows: S1, preparation of P solution: uniformly mix acetone and anhydrous ethanol according to a volume ratio of 3-4:1, then add P powder to prepare a P solution with a concentration of 0.1-1 g / ml; S2, preparation of modified PET: immerse PET fiber in an ethanol solution with a concentration of 30-45%, ultrasonically treat for 30-45 min, then dry, immerse the dried PET fiber in the P solution obtained in step S1, add 1-5 parts by weight of sodium periodate, stir for 1-2 h, then vacuum dry at 40-45°C for 10-12 h, pour out the supernatant, then dry at 100-120°C for 1-2 h to obtain modified PET; S3, preparation of antibacterial absorbent core: twist the modified PET obtained in step S2 to obtain modified PET fiber with a double helix structure, control the auxiliary airflow to make the modified PET fiber form a single column with a structure of large-small-large from top to bottom, feed the lower non-woven fabric, and apply sizing on the upper surface of the lower non-woven fabric; mix SAP and the modified PET fiber, then perform negative pressure adsorption, transportation and molding, and then composite the mixture onto the surface of the lower non-woven fabric; feed the upper non-woven fabric, apply sizing on the lower surface of the upper non-woven fabric, and then composite the upper non-woven fabric onto the product in step b, and cut to obtain the antibacterial absorbent core; The preparation method of the P powder is as follows: under high-purity nitrogen protection, mix dopamine hydrochloride, N,N-dimethylformamide and propylene glycol methyl ether according to a solid-liquid ratio of 3-5:20:20, stir for 1-2 h to make the dopamine hydrochloride fully dissolved, and obtain a first mixture; add 1-3 parts by weight of silver amide solution to the first mixture obtained in step I, heat to 60-70°C, then add 10-15 parts by weight of azo glycol enamine, increase the temperature to 100-120°C, and react at constant temperature for 48-50 h to obtain a second mixture. The second mixed solution obtained in step II is precipitated once in a hydrochloric acid solution with a pH of 1-1.5, the precipitate is collected, the precipitate is dissolved in N,N-dimethylformamide, and then precipitated twice in a hydrochloric acid aqueous solution with a pH of 1-1.5, the above process is repeated 2-3 times, then the dialysis treatment is carried out using a dialysis bag with a molecular weight cut-off of 3000-3500 Da, and then vacuum drying is carried out to obtain P powder.

2. The bacteriostatic absorbent core according to claim 1, characterized in that The SAP is distributed in peaks staggered between the upper and lower layers of the double helix structure.

3. The bacteriostatic absorbent core according to claim 1, characterized in that The modified PET fiber has a wave shape.

4. A method of making a bacteriostatic absorbent core, characterized by The method comprises the following steps: S1, P solution preparation: uniformly mix acetone and anhydrous ethanol according to a volume ratio of 3-4:1, then add P powder to prepare a P solution with a concentration of 0.1-1 g / ml; S2, preparation of modified PET: immerse PET fibers in an ethanol solution with a concentration of 30-45%, perform ultrasonic treatment for 30-45 min, then dry, immerse the dried PET fibers in the P solution obtained in step S1, add 1-5 parts by weight of sodium metaperiodate, stir for 1-2 h, then vacuum dry at 40-45°C for 10-12 h, pour out the supernatant, then dry at 100-120°C for 1-2 h to obtain modified PET; S3, preparation of antibacterial absorption core: Twist the modified PET obtained in step S2 to obtain modified PET fibers with a double helix structure, and control the auxiliary airflow to make the modified PET fibers form a single column with a large-small-large structure from top to bottom, wind and deliver the lower non-woven fabric, and apply glue to the upper surface of the lower non-woven fabric; Mix the SAP and the modified PET fibers, then perform negative pressure adsorption, delivery, and molding, and then composite the SAP and the modified PET fibers onto the surface of the lower non-woven fabric; Wind and deliver the upper non-woven fabric, apply glue to the lower surface of the upper non-woven fabric, and then composite the upper non-woven fabric onto the product in step b, and cut to obtain the antibacterial absorption core. The preparation method of the P powder is as follows: Under high-purity nitrogen protection, uniformly mix dopamine hydrochloride, N,N-dimethylformamide, and propylene glycol methyl ether according to a solid-liquid ratio of 3-5:20:20, respectively, add dopamine hydrochloride into N,N-dimethylformamide and propylene glycol methyl ether, stir for 1-2 h to make dopamine hydrochloride fully dissolved, and obtain a first mixed solution; Add 1-3 parts by weight of silver amide solution to the first mixed solution obtained in step I, heat to 60-70°C, then add 10-15 parts by weight of azobenzene diol enamine, increase the temperature to 100-120°C, and react for 48-50 h to obtain a second mixed solution. The second mixed solution obtained in step II is precipitated once in a hydrochloric acid solution with pH of 1-1.5, the precipitate is collected, the precipitate is dissolved in N,N-dimethylformamide, and then precipitated twice in a hydrochloric acid aqueous solution with pH of 1-1.5, the above process is repeated for 2-3 times, then the dialysis treatment is performed using a dialysis bag with a molecular weight cut-off of 3000-3500 Da, and then vacuum drying is performed to obtain P powder.

5. The method of claim 4, wherein the bacteriostatic absorbent core is prepared by the steps of: The dialysis treatment is that the dialysis purification is performed in N,N-dimethylformamide solution for 72-75 h, and then in deionized water for 72-75 h, and the dialysate is replaced every 6-8 h.

6. The method of claim 4, wherein the bacteriostatic absorbent core is prepared by the steps of: The twisting treatment is: using air jet spinning machine, using high speed airflow to realize twisting, twist is 2500-4500T·m -1 , main airflow speed is 50-200m / s, auxiliary airflow speed is 10-50m / s.

7. The method of claim 4, wherein the bacteriostatic absorbent core is prepared by the steps of: The ultrasonic treatment is performed in an ultrasonic cleaner, and the ultrasonic power is 100-120 HZ.

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