Preparation method and application of super-soft and smooth pure cotton non-woven fabric

Abstract

The present application relates to the technical field of non-woven fabrics, and provides a preparation method and application of super-soft and smooth pure cotton non-woven fabric, which solves the problem of poor softness and dryness of the existing ordinary pure cotton non-woven fabric. The preparation method comprises the following steps: S1, preparation of base cloth: taking fine cotton and long cotton as fiber raw materials, and obtaining the base cloth through a water jet process; S2, preparation of coating agent: the coating agent comprises the following raw materials in mass percentage: 72-90% of glycerol, 0.3-0.6% of cationic surfactant, 0.06-0.12% of clove extract, 0.02-0.06% of calendula extract, and the balance is deionized water; S3, post-finishing: the base cloth is post-finished through a multi-roller transfer roller coating process, so that the coating agent is uniformly and accurately coated on the base cloth. The prepared super-soft and smooth pure cotton non-woven fabric can be applied to the surface layer of disposable sanitary products, and excellent softness, dryness and antibacterial property are given to the products.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of non-woven fabric technology, in particular to a preparation method of super-soft and smooth pure cotton non-woven fabric and application thereof. BACKGROUND

[0002] Sanitary napkin is an essential article for women during menstruation, which is used to absorb the menstrual blood flowing out of the vagina during the menstrual period. The structure of the sanitary napkin mainly includes a sanitary napkin body and wings, and the sanitary napkin body generally includes a surface layer, an absorbent core layer and a bottom film layer. During the menstrual period, the local skin is relatively sensitive, and the surface layer of the sanitary napkin, as the material directly contacting the most soft and private part of the female, must consider its softness, comfort and touch.

[0003] The commonly used surface layer of sanitary napkin on the market mainly includes the following three types: (1) dry surface layer. The dry surface layer is composed of a PE film and special micropores, commonly known as PE perforated film, which has good absorbency and is not easy to backflow, and can keep the surface dry. It is easy to cause allergic reactions, and can cause symptoms such as vulvar itching and folliculitis. (2) Soft surface layer. The soft surface layer is a chemical fiber non-woven fabric made of polypropylene particles as raw material, which is processed through a series of processes such as high-temperature melting, spinning, web laying and hot pressing. After chemical processing, it has a soft touch like cotton, is not only soft and breathable, but also has a certain dryness, so it is favored by manufacturers. However, this material also belongs to chemical fiber, which may increase the probability of allergy and has the risk of sensitization. (3) Pure cotton surface layer. The pure cotton surface layer is mainly a pure cotton non-woven fabric made of cotton fibers, which has the characteristics of strong water absorption, good air permeability, skin-friendly and no irritation, and is deeply loved by consumers. Ordinary pure cotton non-woven fabric is made of fine cotton as raw material, which belongs to cellulose fiber. Due to the poor flexibility of cellulose macromolecules, it belongs to relatively rigid macromolecules, so the cotton fiber is relatively hard, and the pure cotton non-woven fabric made of fine cotton is not soft enough. In addition, the cotton fiber molecules contain a large number of hydrophilic groups, which have excellent moisture absorption performance, resulting in poor dryness, and easy to have a large backflow amount, thereby making the private part obviously wet.

[0004] Chinese patent number CN201910585385.5 discloses a sanitary napkin with a non-woven fabric perforated film composite surface layer, comprising a sanitary napkin body and two side wings, the top of the sanitary napkin body is a surface layer, the surface layer is composed of an upper hot air non-woven fabric layer and a lower PE perforated film layer, which creatively uses hot air non-woven fabric and PE perforated film, and the two are compounded into a new double-layer material surface layer to replace the traditional surface layer. Since the hot air non-woven fabric layer is in direct contact with the human body, there is no potential safety risk, and the touch is soft and comfortable, the moisture absorption and permeation performance are good, and the inverted V-shaped holes or inverted W-shaped holes arranged on the PE perforated film layer can effectively prevent backflow and keep the surface layer dry. The female private parts are warm and humid, and the menstrual blood contains rich nutrients, creating a favorable environment for the proliferation of bacteria, and thus triggering a series of gynecological inflammation. The surface layer of the invention does not have antibacterial effect and cannot solve the above problems. SUMMARY

[0005] Therefore, in view of the above, one of the purposes of the present application is to provide a preparation method of super-soft and smooth pure cotton non-woven fabric, which uses long-staple cotton and fine-staple cotton as raw materials, first goes through the processes of opening, mixing, carding, water jet forming to obtain a base cloth, and then is treated by coating reagents to obtain the required super-soft and smooth pure cotton non-woven fabric, solving the problem of poor softness and dryness of existing ordinary pure cotton non-woven fabric.

[0006] Another purpose of the present application is to use the super-soft and smooth pure cotton non-woven fabric as a surface layer material in disposable sanitary products including sanitary napkins.

[0007] To achieve the above purposes, the present application is realized by the following technical solutions:

[0008] A preparation method of super-soft and smooth pure cotton non-woven fabric, comprising the following steps:

[0009] S1, preparation of base cloth: fine-staple cotton and long-staple cotton are used as fiber raw materials of the base cloth, wherein the fine-staple cotton accounts for 65-90% of the total mass of the raw materials, and the long-staple cotton accounts for 10-35% of the total mass of the raw materials. The fiber raw materials are subjected to the processes of opening, mixing, carding, laying, lamination, water jetting, detection, winding and slitting to obtain the base cloth;

[0010] S2, preparation of coating reagent: the coating reagent comprises the following raw materials in the following mass percentages: 72-90% glycerol, 0.3-0.6% cationic surfactant, 0.06-0.12% clove extract, 0.02-0.06% calendula extract, and the balance is deionized water;

[0011] S3, finishing: the base cloth is finished by a multi-roller transfer roller coating process, so that the coating reagent is uniformly and accurately coated on the base cloth.

[0012] Further improvement is that the multi-roller transfer roll coating process comprises a unwinding roller, a winding roller and a coating assembly arranged between the unwinding roller and the winding roller, the coating assembly comprises a homogenizing roller, a coating roller and a pressure roller arranged in sequence along the conveying direction, the unwinding roller and the coating assembly are connected through a front guide roller, the coating assembly and the winding roller are connected through a rear guide roller, the homogenizing roller is provided with a scraping device on the side away from the coating roller, a reagent tank is arranged below the homogenizing roller, the lower end of the homogenizing roller is immersed in the reagent tank, the scraping device uniformly attaches the coating reagent on the homogenizing roller, and then the coating reagent is transferred to the coating roller, a gap for the base fabric to pass through is arranged between the coating roller and the pressure roller, and the speed ratio of the homogenizing roller and the coating roller is 0.35-0.90, and the unwinding speed is 55-100 m / min.

[0013] Further improvement is that the included angle between the line connecting the central axes of the homogenizing roller and the coating roller and the line connecting the central axes of the coating roller and the pressure roller is 90-150°.

[0014] Further improvement is that the cationic surfactant is prepared according to the following steps:

[0015] (1) 4-(2,3-epoxypropane) morpholine and a halogenated alkane are dissolved in an organic solvent, uniformly mixed, heated to 60-80 DEG C, stirred for 48-72 h, cooled to room temperature, and the unreacted halogenated alkane is removed to obtain an intermediate A, wherein the halogenated alkane is a bromide or chloride of a saturated aliphatic hydrocarbon with 4-8 carbon atoms;

[0016] (2) the intermediate A and cyclohexeneethylamine are added to a reactor, a first polymerization inhibitor is added, stirred at 25-45 DEG C for 5-10 h, filtered, washed, concentrated under reduced pressure after the reaction is completed to obtain an intermediate B;

[0017] (3) polymethylhydrogen siloxane, the intermediate B, a second polymerization inhibitor and a catalyst are dissolved in toluene solvent, stirred at 80-100 DEG C for 4-6 h, filtered, washed, concentrated under reduced pressure and extracted after the reaction is completed to obtain the cationic surfactant.

[0018] Further improvement is that the molar ratio of the 4-(2,3-epoxypropane) morpholine and the halogenated alkane is 1:1.2-1.5.

[0019] Further improvement is that the molar ratio of the intermediate A and the cyclohexeneethylamine is 1:1.1-1.3, and the addition amount of the first polymerization inhibitor is 0.08-0.2% of the total mass of the intermediate A and the cyclohexeneethylamine.

[0020] Further improvement is that the molecular weight of the polymethyl hydrogen siloxane is 1200-3000, the hydrogen content is 0.5-1.5wt%, and the molar ratio of the silicon hydrogen bond in the polymethyl hydrogen siloxane to the carbon-carbon double bond of the intermediate B is 1:0.8-1.

[0021] Further improvement is that the adding amount of the second polymerization inhibitor is 0.02-0.08% of the total mass of the polymethyl hydrogen siloxane and the intermediate B; and the catalyst is a platinum catalyst, and the adding amount is 50-100ppm of the total mass of the polymethyl hydrogen siloxane and the intermediate B.

[0022] Further improvement is that the first polymerization inhibitor and the second polymerization inhibitor are independently selected from any one of hydroquinone, 2,5-di-tert-butyl hydroquinone and p-hydroxyanisole.

[0023] The application also claims the super-soft and smooth pure cotton non-woven fabric prepared by the above preparation method.

[0024] The application also claims the application of the super-soft and smooth pure cotton non-woven fabric in disposable sanitary products.

[0025] By adopting the above technical scheme, the application has the following beneficial effects:

[0026] 1. The pure cotton spunlace non-woven fabric prepared by the application uses fine cotton and long cotton as raw materials in a specific ratio, and the softness and touch of the pure cotton spunlace non-woven fabric prepared from 100% fine cotton are improved.

[0027] 2、The application adjusts and optimizes the formula of the coating agent, uniformly and accurately coats the coating agent on the base cloth through finishing, improves the softness and dryness of the base cloth, and endows the base cloth with good antibacterial property.The specific action mechanism is as follows:(1) glycerol is mild and non-irritating, has the effect of moisturizing and nourishing, and adding glycerol in the formula of the coating agent can endow the base cloth with a softer touch, and form a protective film on the skin surface during use, thereby playing the role of moisturizing and skin care.(2) the cationic surfactant has a positive charge, while the cotton fiber has a certain negative charge, and through the bonding of positive and negative ions, the coating agent can be adsorbed on the surface of the base cloth.The amino and hydroxyl groups in the molecular structure of the cationic surfactant can interact with the hydroxyl and carboxyl groups on the surface of the cotton fiber, and are further adsorbed on the cotton fiber.Meanwhile, the compound has good permeability, which can promote the penetration and absorption of other raw material components.During the preparation process of the cationic surfactant, first, the quaternary ammonium reaction of 4-(2,3-epoxypropane) morpholine and halogenated alkane is utilized to obtain intermediate A, and the ether bond in the structure of intermediate A can improve the flexibility of the non-woven fabric;then, the ring-opening reaction of intermediate A and cyclohexene ethylamine is utilized to obtain intermediate B containing hydroxyl and amino active groups, and a carbon-carbon double bond is introduced into the molecular structure;finally, the silicon-hydrogen addition reaction of intermediate B and polymethyl hydrogen siloxane is carried out, and the cationic surfactant is obtained.The dimethyl chain and siloxane bond in the polysiloxane high molecular compound can rotate freely around the macromolecular siloxane-silicon chain, and the siloxane-silicon bond angle is large, so that the non-woven fabric can be endowed with excellent softness;but the surface tension of the siloxane is low, so that the water-repellent effect of the non-woven fabric after finishing is excellent, and when used as a surface layer material, the penetration speed of menstrual blood or urine is slow, and the dry and comfortable experience is poor.Through the silicon-hydrogen addition reaction, the hydrophilic group is introduced into the side chain of the siloxane, which well solves the problem that the softness and hydrophilicity of the existing polysiloxane compound cannot be considered.(3) during the use of disposable sanitary products, the humid and hot environment creates favorable conditions for the growth of bacteria, which may cause skin problems or gynecological diseases.The cationic surfactant prepared in the application has a certain bacteriostatic effect, and can inhibit the reproduction and growth of bacteria.During the research process, it is also found that there is a synergistic effect between the cationic surfactant and the two natural plant extracts, and under the same conditions, the antibacterial effect of the compound is better than that of the natural plant extract or the cationic surfactant used alone.(4) the performance test results show that after the base cloth is finished, the standard synthetic liquid diffusion area is greatly reduced, and the penetration time is increased, so it can be seen that coating a specific coating agent on the base cloth can endow the base cloth with good dryness.In addition, when the urine or menstrual blood penetrates, glycerol can form a water-in-oil state with it, thereby reducing the back penetration amount.

[0028] 3、Compared with the direct roll coating process or the immersion process, the application adopts the multi-roll transfer roll coating process, which can more uniformly control the coating amount and oiling rate of the reagent on the pure cotton non-woven fabric. By adjusting the speed ratio of the homogenizing roll and the coating roll and the unwinding speed, the coating amount of the coating reagent can be controlled, while the base fabric is endowed with more excellent comprehensive performance, unnecessary waste is avoided. After coating, there is no need for drying treatment, which avoids the loss of the coating reagent and the possible denaturation caused by high temperature. After drying treatment, the following situations often occur: the combination between cotton fibers becomes weak, the overall strength decreases, the friction resistance performance becomes poor, thereby causing the material to be easily deformed; the multi-roll transfer roll coating process does not affect the combination between fibers, and maintains the excellent performance of the pure cotton spunlace non-woven fabric. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 is the equipment diagram of the multi-roll transfer roll coating process in the application. DETAILED DESCRIPTION

[0030] The embodiments of the application will be described in detail below with specific examples, so that how the application applies technical means to solve technical problems and achieve technical effects can be fully understood and implemented.

[0031] If not specifically indicated, the technical means used in the examples are conventional means known to those skilled in the art, and the reagents and products used are also commercially available. The source, trade name and composition of the reagents used are indicated at the first occurrence.

[0032] Example 1

[0033] A preparation method of a super-soft and smooth pure cotton non-woven fabric, comprising the following steps:

[0034] S1, preparation of base fabric: fine cotton and long cotton are used as fiber raw materials of the base fabric, wherein the fine cotton accounts for 80% of the total mass of the raw materials, and the long cotton accounts for 20% of the total mass of the raw materials; the fiber raw materials are subjected to the processes of opening and mixing, carding, laying, laminating, spunlace, detection, winding and slitting to obtain the base fabric. The preparation method of the base fabric (i.e. the spunlace non-woven fabric) is a known technology, and can be specifically referred to patent No. CN201910082454.0.

[0035] S2, preparation of coating reagent: the coating reagent comprises the following raw materials in mass percentage: 72% glycerol, 0.6% cationic surfactant, 0.06% clove extract, 0.06% calendula extract, and the balance is deionized water;

[0036] The clove extract is prepared as follows: 50 g of clove powder (crushed by a crusher and then passed through a 80-mesh sieve) is added to 500 mL of deionized water in a distillation flask and soaked for 24 h, and the volatile oil is extracted from the heated liquid by water vapor distillation, and the extraction is performed for more than 3 h. The volatile oil is collected in real time during the extraction, and after the distillation is completed, the volatile oils are combined to obtain the clove extract. The cationic surfactant is prepared according to the following steps:

[0037] (1) 4-(2,3-epoxypropane) morpholine and 1-bromobutane are dissolved in toluene at a molar ratio of 1:1.2, and after being uniformly mixed, the temperature is increased to 60°C, and stirring is performed for 72 h. After being cooled to room temperature, the unreacted 1-bromobutane is removed, and an intermediate A is obtained;

[0038] (2) The intermediate A and cyclohexeneethylamine are added to a reactor at a molar ratio of 1:1.1, and 2,5-di-tert-butyl hydroquinone is simultaneously added. After being stirred at room temperature for 10 h, the reaction is completed, and the intermediate B is obtained by filtration, washing, and concentration under reduced pressure. The addition amount of the 2,5-di-tert-butyl hydroquinone is 0.08% of the total mass of the intermediate A and the cyclohexeneethylamine;

[0039] (3) The polymethylhydrogen siloxane, the intermediate B, the hydroquinone, and chloroplatinic acid are dissolved in toluene, and stirring is performed at 80°C for 6 h. After the reaction is completed, the cationic surfactant is obtained by filtration, washing, concentration under reduced pressure, and extraction treatment.

[0040] The molecular weight of the polymethylhydrogen siloxane is 1200, and the hydrogen content is 0.5 wt%. The molar ratio of the silicon-hydrogen bond in the polymethylhydrogen siloxane to the carbon-carbon double bond of the intermediate B is 1:0.8. The addition amount of the hydroquinone is 0.02% of the total mass of the polymethylhydrogen siloxane and the intermediate B. The addition amount of the chloroplatinic acid is 50 ppm of the total mass of the polymethylhydrogen siloxane and the intermediate B.

[0041] S3, finishing: The base fabric is finished by a multi-roller transfer roller coating process, so that the coating reagent is uniformly and accurately coated on the base fabric.

[0042] Reference Figure 1The multi-roll transfer roll coating process comprises a unwinding roll 1, a winding roll 2 and a coating assembly arranged between the unwinding roll 1 and the winding roll 2, the coating assembly comprises a uniform pulp roll 3, a coating roll 4 and a pressure roll 5 arranged in sequence along a conveying direction, the unwinding roll 1 and the coating assembly are connected through a front guide roll 6, the coating assembly and the winding roll 2 are connected through a rear guide roll 7, the side of the uniform pulp roll away from the coating roll is provided with a scraping device 8, the scraping device 8 is a doctor blade, and other scraping assemblies can also be used, a reagent tank 9 is arranged below the uniform pulp roll 3, the lower end of the uniform pulp roll 3 is immersed in the reagent tank 9, a gap for the base cloth to pass through is arranged between the coating roll 4 and the pressure roll 5, and the included angle α between the connecting line of the central axes of the uniform pulp roll 3 and the coating roll 4 and the connecting line of the central axes of the coating roll 4 and the pressure roll 5 is 90-150°, and α is equal to 120° in the embodiment.

[0043] In work, the base cloth is wound on the unwinding roll, the unwinding roll drives the material through the driving device, and the base cloth continuously transmits forward through the guiding action of the front guide roll and the rear guide roll. The coating reagent is injected into the reagent tank, the scraping device uniformly attaches the coating reagent to the uniform pulp roll, and then transfers to the coating roll rotating in a different direction. When the base cloth passes between the coating roll and the pressure roll, the coating reagent is coated on the surface of the base cloth by the coating roll, and the pressure roll applies a certain pressure to the base cloth, so that the coating reagent is quickly absorbed by the base cloth, and at the same time, the coating amount on the surface of the base cloth can be prevented from being too much.

[0044] Embodiment 2

[0045] A preparation method of a super-soft and smooth pure cotton non-woven fabric comprises the following steps:

[0046] S1, preparation of the base cloth: fine cotton and long cotton are used as fiber raw materials of the base cloth, the fine cotton accounts for 65% of the total mass of the raw materials, and the long cotton accounts for 35% of the total mass of the raw materials, and the fiber raw materials are subjected to the processes of opening and mixing, carding, laying, laminating, water jetting, detection, winding and slitting to obtain the base cloth;

[0047] S2, preparation of the coating reagent: the coating reagent comprises the following raw materials in mass percentage: 80% of glycerol, 0.5% of a cationic surfactant, 0.09% of clove extract, 0.04% of calendula extract, and the balance is deionized water;

[0048] The cationic surfactant is prepared according to the following steps:

[0049] (1) 4-(2,3-epoxypropane) morpholine and 1-chlorohexane are dissolved in an organic solvent at a molar ratio of 1:1.3, uniformly mixed, heated to 70°C, stirred for 60 h, cooled to room temperature, and the unreacted 1-chlorohexane is removed to obtain an intermediate A;

[0050] (2) adding intermediate A, cyclohexene ethylamine in a molar ratio of 1:1.2 into the reactor, adding p-hydroxyanisole at the same time, stirring and reacting at 35℃ for 8h, filtering, washing, and concentrating under reduced pressure after the reaction to obtain intermediate B, the addition amount of p-hydroxyanisole is 0.15% of the total mass of intermediate A and cyclohexene ethylamine;

[0051] (3) dissolving polymethylhydrosiloxane, intermediate B, p-hydroxyanisole, and a catalyst in toluene, stirring and reacting at 90℃ for 5h, filtering, washing, concentrating under reduced pressure, and extracting after the reaction to obtain the cationic surfactant;

[0052] The molecular weight of the polymethylhydrosiloxane is 2000, the hydrogen content is 0.75wt%, the molar ratio of the silicon-hydrogen bond in the polymethylhydrosiloxane to the carbon-carbon double bond in intermediate B is 1:0.9; the addition amount of p-hydroxyanisole is 0.05% of the total mass of polymethylhydrosiloxane and intermediate B; the catalyst is Karstedt catalyst, and the addition amount is 80ppm of the total mass of polymethylhydrosiloxane and intermediate B;

[0053] S3, post-treatment: post-treatment of the base fabric through a multi-roller transfer roller coating process to uniformly and accurately coat the coating agent on the base fabric.

[0054] Example 3

[0055] A preparation method of a super-soft and smooth pure cotton non-woven fabric, comprising the following steps:

[0056] S1, preparation of base fabric: fine cotton and long cotton are used as fiber raw materials of the base fabric, wherein the fine cotton accounts for 90% of the total mass of the raw materials, and the long cotton accounts for 10% of the total mass of the raw materials; the fiber raw materials are subjected to opening and mixing, carding, web laying, lamination, water jet, detection, winding, and slitting processes to obtain the base fabric;

[0057] S2, preparation of coating agent: the coating agent comprises the following raw materials in mass percentage: 90% glycerol, 0.3% cationic surfactant, 0.12% clove extract, 0.02% calendula extract, and the balance is deionized water;

[0058] The cationic surfactant is prepared by the following steps:

[0059] (1) dissolving 4-(2,3-epoxypropane) morpholine and 1-chlorooctane in an organic solvent in a molar ratio of 1:1.5, uniformly mixing, heating to 80℃, stirring and reacting for 48h, cooling to room temperature, and removing the unreacted 1-chlorooctane to obtain intermediate A;

[0060] (2) adding intermediate A, cyclohexene ethylamine ammonium in a molar ratio of 1:1.3 into the reactor, adding hydroquinone at the same time, stirring and reacting at 45°C for 5h, filtering, washing and concentrating under reduced pressure after the reaction to obtain intermediate B, the added amount of hydroquinone being 0.2% of the total mass of intermediate A and cyclohexene ethylamine;

[0061] (3) dissolving polymethyl hydrogen siloxane, intermediate B, p-hydroxy anisole and a catalyst in toluene solvent, stirring and reacting at 100°C for 4h, filtering, washing, concentrating under reduced pressure and extracting after the reaction to obtain the cationic surfactant;

[0062] The molecular weight of the polymethyl hydrogen siloxane is 3000, the hydrogen content is 1.5wt%, the molar ratio of the silicon hydrogen bond in the polymethyl hydrogen siloxane to the carbon-carbon double bond of intermediate B is 1:1; the added amount of p-hydroxy anisole is 0.08% of the total mass of polymethyl hydrogen siloxane and intermediate B; the catalyst is chloroplatinic acid, and the added amount is 100ppm of the total mass of polymethyl hydrogen siloxane and intermediate B;

[0063] S3, finishing: finishing the base fabric through a multi-roll transfer roller coating process to make the coating reagent uniformly and accurately coated on the base fabric.

[0064] Performance test

[0065] The super-soft and smooth pure cotton non-woven fabric prepared in Examples 1-3 was tested for antibacterial property, permeability, diffusion property, and slip-permeability, with the base fabric without post-finishing as a control group I, and the test results are shown in Table 1. The permeability test method is as follows: ① cut the non-woven fabric material of appropriate width and length as a group of experiments, and the non-woven fabric material is not allowed to have obvious creases and defects; ② place the standard core on the test table, and place the test sample closely on the standard core to ensure the test surface is flat; ③ take a certain amount of standard synthetic liquid, and drop it vertically on the test sample surface, and record the standard synthetic liquid disappearance time on the test sample surface; ④ repeat the above steps to complete the permeability test. The shorter the downward penetration time, the worse the dryness. The diffusion property test method is as follows: ① lay a layer of test sample on the standard core, with the use surface of the test sample facing up and keeping flat above the filter paper; ② measure a certain amount of standard synthetic liquid, and drop it at the same position in the middle of the filter paper. After a period of time, measure the maximum diffusion length (L) and the maximum diffusion width (W) of the test sample surface layer; ③ repeat the above steps for testing, and take the average value as the test result. The slip-permeability test method is as follows: ① adjust the test instrument angle, adjust the funnel lower opening position and height, and make the funnel lower opening face the operator, pour an appropriate amount of test solution into the funnel, and rinse the funnel twice; ② place the standard core on the inclined plane, and place the test sample on the standard core with the use surface facing up; ③ accurately take a certain amount of test solution in the funnel with a pipette, then quickly open the funnel gate to the maximum, and make the solution flow freely onto the surface of the test sample and flow down along the inclined plane, and after the flow is completed, close the funnel gate, and collect the flowed-out liquid with a beaker, weigh and record the slip-out amount; ⑤ repeat the above steps, and take the average value of 5 test samples as the test result.

[0066] Table 1

[0067]

[0068] Note: - represents no antibacterial effect.

[0069] Comparative Example 1

[0070] The difference from Example 3 is that no cationic surfactant is added in the coating agent, and the contents of clove extract and marigold extract are increased in proportion, and the total mass remains unchanged. The super-soft and smooth pure cotton non-woven fabric prepared in this comparative example was tested for antibacterial property, and the results showed that the antibacterial rate against Escherichia coli was 84.5%, the antibacterial rate against Staphylococcus aureus was 83.9%, and the antibacterial rate against Candida albicans was 81.7%.

[0071] Comparative Example 2

[0072] The difference from Example 3 is that the clove extract is not added in the coating agent, and the contents of the cationic surfactant and the marigold extract are increased in proportion, and the total mass remains unchanged. The antibacterial property test of the super-soft and smooth pure cotton non-woven fabric prepared in this comparative example shows that the antibacterial rate against Escherichia coli is 85.6%, the antibacterial rate against Staphylococcus aureus is 86.2%, and the antibacterial rate against Candida albicans is 84.8%.

[0073] Comparative Example 3

[0074] The difference from Example 3 is that the marigold extract is not added in the coating agent, and the contents of the cationic surfactant and the clove extract are increased in proportion, and the total mass remains unchanged. The antibacterial property test of the super-soft and smooth pure cotton non-woven fabric prepared in this comparative example shows that the antibacterial rate against Escherichia coli is 82.1%, the antibacterial rate against Staphylococcus aureus is 81.4%, and the antibacterial rate against Candida albicans is 80.3%.

[0075] Comparative Example 4

[0076] The difference from Example 3 is that the marigold extract is replaced by thyme extract. The antibacterial property test of the super-soft and smooth pure cotton non-woven fabric prepared in this comparative example shows that the antibacterial rate against Escherichia coli is 84.4%, the antibacterial rate against Staphylococcus aureus is 86.1%, and the antibacterial rate against Candida albicans is 83.0%.

[0077] Comparative Example 5

[0078] The difference from Example 3 is that the clove extract is replaced by thyme extract. The antibacterial property test of the super-soft and smooth pure cotton non-woven fabric prepared in this comparative example shows that the antibacterial rate against Escherichia coli is 91.9%, the antibacterial rate against Staphylococcus aureus is 91.2%, and the antibacterial rate against Candida albicans is 90.4%.

[0079] Comparative Example 6

[0080] The difference from Example 3 is that the clove extract and the marigold extract are both replaced by thyme extract. The antibacterial property test of the super-soft and smooth pure cotton non-woven fabric prepared in this comparative example shows that the antibacterial rate against Escherichia coli is 90.6%, the antibacterial rate against Staphylococcus aureus is 92.1%, and the antibacterial rate against Candida albicans is 89.9%.

[0081] Comparative Example 7

[0082] The difference from Example 3 is that the clove extract and marigold extract are all replaced by the cationic surfactant. The antibacterial test of the super-soft and smooth pure cotton non-woven fabric prepared in the present comparative example shows that the antibacterial rate against Escherichia coli is 79.8%, the antibacterial rate against Staphylococcus aureus is 81.1%, and the antibacterial rate against Candida albicans is 78.4%.

[0083] As can be seen from the comparison between Example 3 and Comparative Examples 1-7, the cationic surfactant, the clove extract, and the marigold extract all have antibacterial properties, and the combination of them produces a synergistic effect, and the antibacterial effect is significantly enhanced. In the case of the same total amount of addition, the antibacterial effect will decrease if any of the components is absent. Replacing the two natural plant extracts with thyme extract with stronger antibacterial activity will weaken the antibacterial effect, which indicates that the thyme extract does not have a synergistic antibacterial effect with the cationic surfactant and the clove extract or the marigold extract, or the synergistic antibacterial effect is relatively weak.

[0084] Application Example

[0085] The super-soft and smooth pure cotton non-woven fabric prepared in Examples 1-3 is used as the surface layer of sanitary napkins. The base fabric without post-treatment is used as the surface layer material, and the sanitary napkin prepared therefrom is used as the control group II. The re-bleeding amount of the prepared sanitary napkin is detected, and the detection method refers to GB / T 28004-2011. The test results are shown in Table 2.

[0086] Table 2

[0087] Example 1 Example 2 Example 3 Control II Reabsorption / g 1.72 1.65 1.67 2.86

[0088] As can be seen from Table 2, the super-soft and smooth pure cotton non-woven fabric prepared in the present application has a small re-bleeding amount when applied to sanitary napkins, and can ensure the dryness of the surface of the sanitary napkin.

[0089] The above description is only an embodiment of the use of the technical content of the present application. Any modification or change made by those skilled in the art using the present application is within the scope of the patent claimed by the present application, and is not limited to the embodiments disclosed.

Claims

1. A method for preparing an ultra-soft and smooth pure cotton nonwoven fabric, characterized in that: Includes the following steps: S1. Preparation of base fabric: The base fabric is made of fine cotton and long-staple cotton, with fine cotton accounting for 65-90% of the total mass of the raw materials and long-staple cotton accounting for 10-35% of the total mass of the raw materials. The fiber raw materials are subjected to opening and mixing, carding, web laying, lamination, hydroentangling, testing, winding and slitting processes to obtain the base fabric. S2. Preparation of coating reagent: The coating reagent comprises the following raw materials in the following mass percentages: 72-90% glycerol, 0.3-0.6% cationic surfactant, 0.06-0.12% clove extract, 0.02-0.06% calendula extract, and the balance being deionized water; S3. Finishing: The base fabric is finished by a multi-roller transfer coating process to ensure that the coating agent is evenly and accurately coated on the base fabric.

2. The method for preparing an ultra-soft and smooth pure cotton nonwoven fabric according to claim 1, characterized in that: The multi-roller transfer coating process includes an unwinding roll, a take-up roll, and a coating assembly disposed between the unwinding roll and the take-up roll. The coating assembly includes a slurry roller, a coating roll, and a pressure roll arranged sequentially along the conveying direction. The unwinding roll and the coating assembly are connected by a front guide roller, and the coating assembly and the take-up roll are connected by a rear guide roller. A scraping device is provided on the side of the slurry roller away from the coating roll. A reagent tank is provided below the slurry roller, and the lower end of the slurry roller is immersed in the reagent tank. The scraping device evenly adheres the coating reagent to the slurry roller and then transfers it to the coating roll. A gap is provided between the coating roll and the pressure roll for the base fabric to pass through.

3. The method for preparing an ultra-soft and smooth pure cotton nonwoven fabric according to claim 2, characterized in that: The angle between the line connecting the central axes of the homogenizing roller and the coating roller and the line connecting the central axes of the coating roller and the pressure roller is 90° to 150°.

4. The method for preparing an ultra-soft and smooth pure cotton nonwoven fabric according to claim 1, characterized in that: The cationic surfactant is prepared according to the following steps: (1) Dissolve 4-(2,3-epoxypropane)morpholine and haloalkane in an organic solvent, mix them evenly, heat to 60-80℃, stir and react for 48-72h, cool to room temperature, remove unreacted haloalkane, and obtain intermediate A. The haloalkane is a bromide or chloride of a saturated aliphatic hydrocarbon with 4-8 carbon atoms. (2) Add intermediate A and cyclohexene ethylamine to the reactor, and add the first polymerization inhibitor at the same time. Stir the reaction at 25-45°C for 5-10 hours. After the reaction is completed, filter, wash and concentrate under reduced pressure to obtain intermediate B. (3) Dissolve polymethylhydrosiloxane, intermediate B, second polymerization inhibitor and catalyst in toluene solvent, stir and react at 80-100℃ for 4-6 hours, and after the reaction is completed, filter, wash, concentrate under reduced pressure and extract to obtain cationic surfactant.

5. The method for preparing an ultra-soft and smooth pure cotton nonwoven fabric according to claim 4, characterized in that: The molar ratio of 4-(2,3-epoxypropane)morpholine to haloalkane is 1:1.2 to 1.

5.

6. The method for preparing an ultra-soft and smooth pure cotton nonwoven fabric according to claim 4, characterized in that: The molar ratio of intermediate A to cyclohexene ethylamine is 1:1.1 to 1.3, and the amount of the first polymerization inhibitor added is 0.08 to 0.2% of the total mass of intermediate A and cyclohexene ethylamine.

7. The method for preparing an ultra-soft and smooth pure cotton nonwoven fabric according to claim 4, characterized in that: The polymethylhydrosiloxane has a molecular weight of 1200-3000 and a hydrogen content of 0.5-1.5 wt%. The molar ratio of the silicon-hydrogen bond in the polymethylhydrosiloxane to the carbon-carbon double bond in intermediate B is 1:0.8-1.

8. The method for preparing an ultra-soft and smooth pure cotton nonwoven fabric according to claim 4, characterized in that: The amount of the second polymerization inhibitor added is 0.02 to 0.08% of the total mass of polymethylhydrosiloxane and intermediate B; the catalyst is a platinum catalyst, and the amount added is 50 to 100 ppm of the total mass of polymethylhydrosiloxane and intermediate B.

9. The ultra-soft and smooth pure cotton nonwoven fabric prepared by the preparation method according to any one of claims 1 to 8.

10. The application of the ultra-soft and smooth pure cotton nonwoven fabric as described in claim 9 in disposable hygiene products.

Images