Probiotic composite fiber and preparation method thereof, non-woven fabric and sanitary towel

Abstract

The invention relates to the technical field of fiber manufacturing, and discloses a probiotic composite fiber and a preparation method thereof, a non-woven fabric and a sanitary towel. The preparation method comprises the following steps: forming a primary probiotic composite coating layer on the surface of a bare fiber to obtain a first semi-finished product fiber; carrying out tensioning heat treatment on the first semi-finished product fiber to cure the primary probiotic composite coating layer to obtain a second semi-finished product fiber with a probiotic composite coating layer; performing steam heat treatment on the second semi-finished fiber to obtain a third semi-finished fiber; coating the surface of the third semi-finished product fiber with a hydrophilic oil film liquid to form an oil film protection layer on the surface of the fiber so as to obtain a fourth semi-finished product fiber; the four semi-finished product fibers are sequentially crimped, dried and shaped, and the probiotic composite fiber with the probiotic composite coating layer and the oil film coating layer is obtained. The preparation method can be used for preparing the probiotic composite fiber capable of effectively inhibiting the growth of harmful bacteria, and the probiotic composite fiber is beneficial to female health when being applied to sanitary napkins.

Description

Technical Field

[0001] The invention relates to the technical field of fiber manufacturing, and in particular to probiotic composite fiber and a preparation method thereof, a nonwoven fabric and a sanitary napkin. Background Art

[0002] The application of probiotics has begun to be studied in the sanitary napkin field. The current mainstream method is to place probiotics in the absorbent core or surface layer.

[0003] The solution of placing probiotics in the absorbent core has the advantage of simple addition operation, without the need to significantly change the core structure and adjust the production process. However, since the probiotics need to be attached to the human skin to take effect, its disadvantages are also obvious.

[0004] The advantage of placing probiotics on the surface layer is that they are more likely to come into contact with human skin and thus colonize on human skin, thereby inhibiting the growth of harmful bacteria and regulating the microecological environment of women's private parts. However, because probiotics are located on the most accessible surface layer, they are also easily affected during the production process of sanitary napkins or before the sanitary napkin products are used. For example, their activity is affected by storage conditions (such as humidity, temperature or pH value), resulting in a decrease in the inhibitory effect of probiotics on harmful bacteria.

[0005] In view of this, the present invention is proposed. Summary of the invention

[0006] The object of the present invention is to provide probiotic composite fiber and preparation method thereof, non-woven fabric and sanitary napkin, aiming to improve at least one problem mentioned in the background technology.

[0007] The present invention is achieved in that:

[0008] In a first aspect, the present invention provides a method for preparing a probiotic composite fiber, comprising:

[0009] forming a primary probiotic composite coating layer on the surface of the bare fiber to obtain a first semi-finished fiber;

[0010] The first semi-finished fiber is subjected to intense heat setting to solidify the primary probiotic composite coating layer to obtain a second semi-finished fiber having a probiotic composite coating layer;

[0011] The second semi-finished fiber is subjected to steam heat treatment to obtain a third semi-finished fiber;

[0012] A hydrophilic oil film liquid is coated on the surface of the third semi-finished fiber to form an oil film protective layer on the fiber surface, thereby obtaining a fourth semi-finished fiber;

[0013] The four semi-finished fibers are subjected to crimping processing, drying and shaping in sequence to obtain probiotic composite fibers having a probiotic composite coating layer and an oil film coating layer;

[0014] The composite coating layer is formed on the bare fiber surface by coating the probiotic composite coating liquid on the bare fiber surface, wherein the probiotic composite coating liquid includes a first probiotic agent and an adhesive; or, firstly, coating an adhesive liquid on the bare fiber surface to form an adhesive layer, and then coating the first probiotic agent on the surface of the adhesive layer, wherein the adhesive liquid includes an adhesive;

[0015] The hydrophilic oil film liquid includes film-forming substances, which include 30-50 parts of phosphate ester, 25-35 parts of sulfonate and 25-35 parts of succinate salt by weight.

[0016] In an optional embodiment, the first probiotic agent includes inactivated probiotics and fermentation products thereof and prebiotics;

[0017] Alternatively, the first probiotic agent is a probiotic freeze-dried powder;

[0018] Optionally, the probiotic in the first probiotic agent is selected from at least one of Lactobacillus acidophilus, Lactobacillus crispatus, Lactobacillus gestatus, Lactobacillus plantarum, Lactobacillus rhamnosus and Bifidobacterium.

[0019] In an optional embodiment, the probiotic composite coating liquid comprises, by weight: 20 to 50 parts of the first probiotic agent, 30 to 60 parts of an adhesive, and 20 parts of a first solvent;

[0020] Optionally, the first solvent is ultrapure water;

[0021] Alternatively, the glue solution includes 60 to 80 parts of adhesive and 20 to 40 parts of the second solvent, by weight;

[0022] The adhesive is selected from at least one of methylcellulose and polyethylene glycol;

[0023] In an alternative embodiment, the second solvent is selected from ultrapure water.

[0024] In an optional embodiment, the hydrophilic oil film liquid is composed of 30 to 40 parts of a film-forming substance and 20 parts of a third solvent by weight;

[0025] Optionally, the third solvent is selected from ultrapure water.

[0026] Optionally, the hydrophilic oil film liquid further includes a second probiotic agent, and the second probiotic agent is 50 to 40 parts.

[0027] In an optional embodiment, forming a primary probiotic composite coating layer on the bare fiber surface is:

[0028] forming a primary probiotic composite coating layer on the surface of the bare fiber after at least one stretching;

[0029] Alternatively, the surface of the bare fiber is treated during at least one drawing process to form a primary probiotic composite coating layer.

[0030] In an optional embodiment, before forming the primary probiotic composite coating layer on the bare fiber surface, the method further includes:

[0031] Applying an oil agent on the surface of the bare fiber, then drawing the bare fiber coated with the oil agent at least once, and drying the bare fiber in an oven after drawing;

[0032] The oil agent comprises 30-50 parts of phosphate, 25-35 parts of sulfonate and 25-35 parts of succinate by weight;

[0033] Optionally, the phosphate ester is selected from at least one of monoalkyl phosphate ester and alkyl phosphate triethanolamine;

[0034] Optionally, the sulfonate is selected from at least one of sodium alkylbenzene sulfonate and sodium alkyl sulfonate;

[0035] Optionally, the succinate salt is selected from at least one of alkylphenol ether sulfosuccinate sodium salt and succinate sulfonate sodium salt.

[0036] In an optional embodiment, during tense heat setting, the speed ratio is set to 90-99%, the temperature is 90-110° C., and the processing time is 0.2-0.6 min;

[0037] and / or, the steam temperature of the steam heat treatment is 90 to 110° C., and the treatment time is 0.2 to 0.6 min;

[0038] And / or, the mass ratio of the adhesive to the bare fiber is 0.02-0.05:1, the mass ratio of the first probiotic to the bare fiber is 0.01-0.03:1, and the mass ratio of the hydrophilic oil film liquid to the bare fiber is 0.35-0.5:1.

[0039] In a second aspect, the present invention provides a probiotic composite fiber, which is prepared by the preparation method of any one of the aforementioned embodiments.

[0040] In a third aspect, the present invention provides a probiotic non-woven fabric, which is made using the probiotic composite fiber of the aforementioned embodiment.

[0041] In a fourth aspect, the present invention provides a sanitary napkin comprising the probiotic non-woven fabric according to the aforementioned embodiment.

[0042] The present invention has the following beneficial effects:

[0043] The preparation method of the probiotic composite fiber provided by the present invention is to coat the probiotic composite coating layer on the fiber surface, and the fiber can be used to manufacture non-woven fabrics used in the surface layer of sanitary napkins, so that the sanitary napkins can play a role in improving the microecological environment of the female genitals during menstruation. Considering that the probiotic composite coating layer may fall off due to insufficient adhesion of the probiotic composite coating layer during the process of manufacturing the non-woven fabric, the process of manufacturing the non-woven fabric into the sanitary napkin, and the storage of the sanitary napkin, or the probiotic agent may be inactivated due to the processing environment being unfavorable for maintaining the activity of the probiotic agent, an oil film coating layer is coated on the surface of the probiotic composite coating layer. The provision of the oil film coating layer can protect the probiotic composite coating layer, on the one hand, preventing the probiotic composite coating layer from falling off, and on the other hand, preventing the probiotic agent from becoming ineffective. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention clearer, the technical scheme in the embodiments of the present invention will be described clearly and completely below. If the specific conditions are not specified in the embodiments, they are carried out according to conventional conditions or conditions recommended by the manufacturer. If the manufacturer of the reagents or instruments used is not specified, they are all conventional products that can be purchased commercially.

[0045] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0046] The present invention provides a method for preparing a probiotic composite fiber, comprising:

[0047] forming a primary probiotic composite coating layer on the surface of the bare fiber to obtain a first semi-finished fiber;

[0048] The first semi-finished fiber is subjected to intense heat treatment to solidify the primary probiotic composite coating layer to obtain a second semi-finished fiber having a probiotic composite coating layer;

[0049] The second semi-finished fiber is subjected to steam heat treatment to obtain a third semi-finished fiber;

[0050] A hydrophilic oil film liquid is coated on the surface of the third semi-finished fiber to form an oil film protective layer on the fiber surface, thereby obtaining a fourth semi-finished fiber;

[0051] The four semi-finished fibers are crimped and dried in sequence to obtain probiotic composite fibers having a probiotic composite coating layer and an oil film coating layer;

[0052] The composite coating layer is formed on the bare fiber surface by coating the probiotic composite coating liquid on the bare fiber surface, wherein the probiotic composite coating liquid includes a first probiotic agent and an adhesive; or, firstly, coating an adhesive liquid on the bare fiber surface to form an adhesive layer, and then coating the first probiotic agent on the surface of the adhesive layer, wherein the adhesive liquid includes an adhesive;

[0053] The hydrophilic oil film liquid includes film-forming substances, which include 30-50 parts of phosphate ester, 25-35 parts of sulfonate and 25-35 parts of succinate salt by weight.

[0054] The preparation method of the probiotic composite fiber provided in the embodiment of the present invention is to coat the probiotic composite coating layer on the surface of the fiber. The fiber can be used to manufacture non-woven fabrics used in the surface layer of sanitary napkins, so that the sanitary napkins can play a role in improving the microecological environment of the female genitals during menstruation. Considering that the probiotic composite coating layer may fall off due to insufficient adhesion of the probiotic composite coating layer during the process of manufacturing the non-woven fabric, the process of manufacturing the non-woven fabric into the sanitary napkin, and the storage of the sanitary napkin, or the probiotic agent may be inactivated due to the processing environment being not conducive to maintaining the activity of the probiotic agent, an oil film coating layer is coated on the surface of the probiotic composite coating layer. The setting of the oil film coating layer can protect the probiotic composite coating layer, on the one hand, it can prevent the probiotic composite coating layer from falling off, and on the other hand, it can prevent the probiotic agent from becoming ineffective.

[0055] Specifically, the preparation method is:

[0056] S1. Bare fiber preparation

[0057] The PET masterbatch and the PE masterbatch are melted separately, and then composite spinning is performed to obtain bare fibers of the PET and PE composite material.

[0058] It should be noted that PET and PE composite fibers are only one material selected for the present invention, and other fiber materials conventionally used in manufacturing non-woven fabrics are also applicable in this application.

[0059] S2. Oiling

[0060] The surface of the bare fiber is coated with an oil agent, which comprises, by weight, 30 to 50 parts of phosphate ester, 25 to 35 parts of sulfonate, 25 to 35 parts of succinate salt, and 20 parts of ultrapure water.

[0061] The functions of phosphate esters and sulfonates in oils are to achieve emulsification and antistatic properties, while the function of succinate esters is to act as lubricants.

[0062] Optionally, the phosphate ester is selected from at least one of monoalkyl phosphate ester and alkyl phosphate triethanolamine;

[0063] Optionally, the sulfonate is selected from at least one of sodium alkylbenzene sulfonate and sodium alkyl sulfonate;

[0064] Optionally, the succinate salt is selected from at least one of alkylphenol ether sulfosuccinate sodium salt and succinate sulfonate sodium salt.

[0065] The applied oil can act as a lubricant and has good lubrication properties. It can reduce the friction between fibers and between fibers and equipment parts, making the fibers smoother during processing and reducing the generation of lint and broken ends.

[0066] Optionally, the ratio of the amount of the oil to the mass of the bare fiber is 0.01 to 0.05:1 (eg, 0.01:1, 0.03:1 or 0.05:1).

[0067] S3, Drafting

[0068] The oiled fibers are drafted at least once, and the fibers can reach a target fineness through drafting.

[0069] Optionally, the number of stretching times can be adjusted according to the target fineness to be achieved. If the target fineness is smaller, the number of stretching times can be increased, and if the target fineness is larger, the number of stretching times can be reduced.

[0070] For example, the target fineness is usually 0.8 to 8 denier, and the number of drafting times is two or three times.

[0071] The operating speed ratio parameter during each draft is 90%.

[0072] S4. Drying

[0073] Since the fiber surface is coated with oil, which contains a lot of water, if the first probiotic agent is directly coated on the surface, it will cause problems such as difficulty in adhesion. Therefore, the fiber surface needs to be dried.

[0074] The drying operation method is specifically to dry the moisture in the degreasing agent in an oven at high temperature.

[0075] S5. Forming a primary probiotic composite coating layer

[0076] There are two ways to form the primary probiotic composite coating layer:

[0077] (1) coating a probiotic composite coating liquid on the surface of the bare fiber to form a primary probiotic composite coating layer, wherein the probiotic composite coating liquid includes a first probiotic agent and an adhesive.

[0078] Optionally, the probiotic composite coating liquid comprises, by weight: 20 to 50 parts of the first probiotic agent, 30 to 60 parts of an adhesive, and 20 parts of a first solvent;

[0079] Optionally, the adhesive is selected from at least one of water-based adhesives such as methylcellulose and polyethylene glycol. These types of adhesives are non-irritating to human skin and have high safety.

[0080] Optionally, the first solvent is selected from ultrapure water.

[0081] (2) Firstly, a glue solution is coated on the surface of the bare fiber to form a glue layer, and then a first probiotic agent is coated on the surface of the glue layer to form a primary probiotic composite coating layer, wherein the glue solution includes an adhesive.

[0082] Optionally, the first probiotic may be applied by applying a dry powder of the first probiotic, or by dispersing the first probiotic in water and then applying the powder.

[0083] Optionally, the glue solution includes 60 to 80 parts of an adhesive and 20 to 40 parts of a second solvent.

[0084] Optionally, the adhesive is selected from at least one of methylcellulose and polyethylene glycol. These types of adhesives are non-irritating to human skin and have high safety.

[0085] Optionally, the second solvent is selected from ultrapure water.

[0086] The first probiotic agent used in the above two methods of forming the primary probiotic composite coating layer includes inactivated probiotics and their fermentation products and prebiotics. The fermentation product can be understood as the product obtained after the probiotics are fermented in a liquid culture medium for a period of time and the bacteria and water are removed therefrom; or, the first probiotic agent is a probiotic freeze-dried powder.

[0087] Optionally, the probiotics in the first probiotic are selected from at least one of Lactobacillus acidophilus, Lactobacillus crispatus, Lactobacillus formatus, Lactobacillus plantarum, Lactobacillus rhamnosus and Bifidobacterium. Optionally, to ensure that the first probiotic has a suitable loading, the mass ratio of the amount of the first probiotic to the bare fiber is 0.005 to 0.03:1 (e.g., 0.005:1, 0.01:1, 0.02:1 or 0.03:1); to ensure that the first probiotic can be firmly coated on the surface of the bare fiber, the mass ratio of the amount of the adhesive to the bare fiber is 0.02 to 0.05:1 (e.g., 0.02:1, 0.03:1, 0.04:1 or 0.05:1).

[0088] Optionally, the coating method is spraying or roller coating.

[0089] S6, heat tension setting

[0090] The fiber coated with the primary probiotic composite coating layer is subjected to heat tension setting. During the heat tension setting, the speed ratio is set to 90-99% (for example, 90%, 95% or 99%), the temperature is set to 90-110°C (for example, 90°C, 100°C or 110°C), and the processing time is 0.2-0.6min (for example, 0.2min, 0.4min or 0.6min).

[0091] The heat tension setting here can achieve the setting of the fiber, promote the rapid reaction and curing of the adhesive, and improve the adhesion strength between the first probiotic agent and the fiber.

[0092] S7. Steam heat treatment

[0093] The steam temperature is set to 90-110° C. (eg, 90° C., 100° C. or 110° C.), and the fibers are subjected to steam heat treatment for 0.2-0.6 min (eg, 0.2 min, 0.4 min or 0.6 min).

[0094] Steam heat treatment can increase the temperature of the fiber to a state suitable for subsequent processing. This is very important for ensuring the performance and quality of the fiber in subsequent processes. At the same time, steam heat treatment helps to evenly distribute the hydrophilic oil on the fiber, thereby improving the hydrophilicity and feel of the fiber.

[0095] S8, coating hydrophilic oil film liquid

[0096] The hydrophilic oil film liquid is applied to the fiber surface after steam heat treatment. Due to the steam treatment in the previous step, the film-forming substances in the hydrophilic oil film liquid can be stably attached to the fiber surface to achieve stable coating.

[0097] Optionally, the hydrophilic oil film liquid is composed of 30-40 parts of a film-forming substance and 20 parts of a third solvent by weight, wherein the film-forming substance includes 30-50 parts of a phosphate ester, 25-35 parts of a sulfonate, and 25-35 parts of a succinate salt.

[0098] Optionally, the phosphate ester is selected from at least one of monoalkyl phosphate ester and alkyl phosphate triethanolamine;

[0099] Optionally, the sulfonate is selected from at least one of sodium alkylbenzene sulfonate and sodium alkyl sulfonate;

[0100] Optionally, the succinate ester is selected from at least one of alkylphenol ether sulfosuccinate sodium salt and succinate sulfonate sodium salt.

[0101] Optionally, the third solvent is selected from ultrapure water.

[0102] Optionally, in order to achieve better coating of the fiber and ensure the comfort of the fiber, the mass ratio of the hydrophilic oil film liquid to the bare fiber is 0.35 to 0.5:1 (eg, 0.35:1, 0.4:1, 0.45:1 or 0.5:1).

[0103] Optionally, the hydrophilic oil film liquid further includes a second probiotic agent, which is 40 to 50 parts. The second probiotic agent is added to the hydrophilic oil film liquid so that the probiotic agent still exists in the outermost coating layer of the fiber, which can increase the loading amount of the probiotic agent.

[0104] Optionally, the second probiotic is the same as the first probiotic.

[0105] S9, post-processing

[0106] The fibers coated with the hydrophilic oil film liquid are curled, dried and shaped.

[0107] The curling process of composite spinning can mainly increase the cohesion between fibers, improve the elasticity and fluffiness of fibers, and improve the spinnability of fibers and the fullness of fabrics. Drying and shaping is to remove moisture or solvent on the fiber surface and shape the fibers.

[0108] Optionally, the drying temperature is 90-110° C. (eg, 90° C., 100° C. or 110° C.).

[0109] The probiotic composite fiber provided by the embodiment of the present invention is prepared by the preparation method provided by the present invention.

[0110] The probiotic non-woven fabric provided in the embodiment of the present invention is made by using the probiotic composite fiber provided by the present invention.

[0111] The sanitary napkin provided by the embodiment of the present invention comprises the probiotic non-woven fabric provided by the embodiment of the present invention.

[0112] Example 1

[0113] The PET masterbatch and the PE masterbatch were melted separately, and then composite spinning was performed to obtain bare fibers of a composite material with a PET:PE ratio of 60:40.

[0114] The surface of the bare fiber is coated with an oil agent, which includes 40 parts of phosphate (alkyl phosphate triethanolamine), 30 parts of sulfonate (alkyl sodium sulfonate), 30 parts of succinate (alkylphenol ether sulfosuccinate sodium salt) and 20 parts of ultrapure water. The ratio of the coating amount to the bare fiber is 0.02:1.

[0115] The oiled fiber was drawn twice to obtain a fiber with a fineness of 1.5 denier.

[0116] The drawn fibers are dried to remove moisture.

[0117] The probiotic composite coating liquid is sprayed on the dried fiber surface. The probiotic composite coating liquid contains 50 parts of adhesive (methylcellulose), 30 parts of the first probiotic agent and 20 parts of solvent (ultrapure water) by weight. The first probiotic agent is Lactobacillus acidophilus (LA88) and its fermentation product and prebiotics. The ratio of adhesive to bare fiber in the sprayed probiotic composite coating liquid is 0.02:1.

[0118] The fiber was tensioned at a speed ratio of 95%, and the temperature was raised to 100° C. to perform heat treatment on the fiber for 0.2 min.

[0119] The heat-treated fibers were subjected to steam heat treatment, with the steam temperature being 95° C. and the treatment time being 0.2 min.

[0120] The steam-treated fiber surface is sprayed with a hydrophilic oil film liquid, which contains 40 parts of film-forming substances (including alkyl phosphate diethanolamine, alkyl sodium sulfonate and alkylphenol ether sulfosuccinate sodium salt in a mass ratio of 4:3:3) and 60 parts of solvent (ultrapure water) by weight. The mass ratio of the sprayed hydrophilic oil film liquid to the bare fiber is 0.035:1.

[0121] The fiber sprayed with the hydrophilic oil film liquid was curled and dried at 98°C to obtain the probiotic composite fiber.

[0122] Example 2

[0123] The PET masterbatch and the PE masterbatch were melted separately, and then composite spinning was performed to obtain bare fibers of a composite material with a PET:PE ratio of 60:40.

[0124] An oil agent is coated on the surface of the bare fiber. The formula of the oil agent is the same as that in Example 1, and the ratio of the coating amount to the bare fiber is 0.02:1.

[0125] The oiled fiber was drawn twice to obtain a fiber with a fineness of 1.5 denier.

[0126] The drawn fibers are dried to remove moisture.

[0127] The glue liquid is sprayed on the dried fiber surface to form a glue layer, and the glue liquid contains 60 parts of adhesive (methyl cellulose) and 40 parts of solvent (ultrapure water) by weight. The ratio of the adhesive in the sprayed glue liquid to the bare fiber is 0.02:1.

[0128] After spraying the glue, the first probiotic is evenly sprayed into the glue layer, wherein the first probiotic is freeze-dried powder of Lactobacillus acidophilus (LA88), and the ratio of the spraying amount of the first probiotic to the bare fiber is less than 0.008:1.

[0129] The fiber was tensioned at a speed ratio of 95%, and the temperature was raised to 100° C. to perform heat treatment on the fiber for 0.2 min.

[0130] The heat-treated fibers were subjected to steam heat treatment, with the steam temperature being 95° C. and the treatment time being 0.2 min.

[0131] The steam-treated fiber surface was sprayed with a hydrophilic oil film liquid, which contained 40 parts of film-forming substances by weight (the formula was the same as in Example 1). The mass ratio of the sprayed hydrophilic oil film liquid to the bare fiber was 0.035:1.

[0132] The fiber sprayed with the hydrophilic oil film liquid was curled and dried at 98°C to obtain the probiotic composite fiber.

[0133] Example 3

[0134] This embodiment is substantially the same as the embodiment 1, except that the hydrophilic oil film liquid further contains 30 portions of a second probiotic additive (the same as the first probiotic additive).

[0135] Comparative Example 1

[0136] This comparative example is basically the same as Example 1, except that no hydrophilic oil film liquid is applied.

[0137] Comparative Example 2

[0138] This comparative example is substantially the same as Example 1, except that no steam heat treatment was performed.

[0139] Comparative Example 3

[0140] This comparative example is substantially the same as Example 1, except that no heat tension setting treatment is performed before the steam heat treatment.

[0141] Comparative Example 4

[0142] This comparative example is basically the same as Example 1, except that no probiotic composite coating liquid is sprayed and no hydrophilic oil film liquid is sprayed.

[0143] Experimental example

[0144] The fibers prepared in each embodiment and comparative example were tested according to the carrier antibacterial test method in GB 15979E.6.3, and the test results were recorded in Table 1.

[0145] Table 1 Statistics of experimental results of various embodiments and comparative examples

[0146]

[0147] It can be seen from the data in Table 1 that the growth of harmful bacteria on the nonwoven fabrics prepared in each embodiment of the present invention is significantly worse than that in Comparative Example 4. This indicates that the fibers in the embodiments of the present invention have a significant inhibitory effect on harmful bacteria.

[0148] Comparing Comparative Example 1 with Example 1, the growth of harmful bacteria in Comparative Example 1 is significantly greater than that in Example 1, indicating that if the oil film is not wrapped in the outermost layer, the inhibitory effect on harmful bacteria will be weakened due to the inactivation of the efficacy of the probiotic agent.

[0149] Comparing Comparative Example 2 with Example 1, the growth of harmful bacteria in Comparative Example 2 is significantly greater than that in Example 1, indicating that if steam heat treatment is not performed, the oil film coating stability is poor, resulting in poor protection of the probiotics, and the inhibitory effect on harmful bacteria is weakened due to the inactivation of the efficacy of the probiotics.

[0150] Comparing Comparative Example 3 with Example 1, the growth of harmful bacteria in Comparative Example 2 is significantly greater than that in Example 1, indicating that if the intense heat setting treatment is not performed, the adhesive will not be set, and the subsequent steam heat treatment will cause the probiotics to fall off, thereby reducing the antibacterial effect.

[0151] In summary, the preparation method of the probiotic composite fiber provided by the present invention, by coating the probiotic composite coating layer on the surface of the fiber, the fiber can be used to manufacture non-woven fabrics used in the surface layer of sanitary napkins, so that the sanitary napkins can play a role in improving the microecological environment of the female genitals during menstruation. Considering that the probiotic composite coating layer may fall off due to insufficient adhesion of the probiotic composite coating layer during the process of manufacturing the non-woven fabric, the process of manufacturing the non-woven fabric into the sanitary napkin, and the storage of the sanitary napkin, or the probiotic agent may be inactivated due to the processing environment being not conducive to maintaining the efficacy and activity of the probiotic agent, an oil film coating layer is coated on the surface of the probiotic composite coating layer. The setting of the oil film coating layer can protect the probiotic composite coating layer, on the one hand, it can prevent the probiotic composite coating layer from falling off, and on the other hand, it can prevent the probiotic agent from becoming ineffective.

[0152] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for preparing a probiotic composite fiber, characterized in that: include: forming a primary probiotic composite coating layer on the surface of the bare fiber to obtain a first semi-finished fiber; The first semi-finished fiber is subjected to intense heat setting to solidify the primary probiotic composite coating layer to obtain a second semi-finished fiber having a probiotic composite coating layer; The second semi-finished fiber is subjected to steam heat treatment to obtain a third semi-finished fiber; Applying a hydrophilic oil film liquid on the surface of the third semi-finished fiber to form an oil film protective layer on the fiber surface to obtain a fourth semi-finished fiber; The four semi-finished fibers are subjected to curling processing, drying and shaping in sequence to obtain probiotic composite fibers having the probiotic composite coating layer and the oil film coating layer; The composite coating layer is formed on the bare fiber surface by coating a probiotic composite coating liquid on the bare fiber surface, wherein the probiotic composite coating liquid includes a first probiotic agent and an adhesive; or, firstly, coating an adhesive liquid on the bare fiber surface to form an adhesive layer, and then coating the first probiotic agent on the surface of the adhesive layer, wherein the adhesive liquid includes an adhesive; The hydrophilic oil film liquid includes a film-forming substance, which includes 30 to 50 parts of phosphate, 25 to 35 parts of sulfonate and 25 to 35 parts of succinate salt by weight.

2. The preparation method according to claim 1, characterized in that: The first probiotic agent includes inactivated probiotics and fermentation products thereof and prebiotics; Alternatively, the first probiotic agent is a probiotic freeze-dried powder; Optionally, the probiotics in the first probiotic agent are selected from at least one of Lactobacillus acidophilus, Lactobacillus crispatus, Lactobacillus gestatus, Lactobacillus plantarum, Lactobacillus rhamnosus and Bifidobacterium.

3. The preparation method according to claim 1, characterized in that: The probiotic composite coating liquid comprises, by weight: 20 to 50 parts of a first probiotic agent, 30 to 60 parts of an adhesive, and 20 parts of a first solvent; Optionally, the first solvent is ultrapure water; Alternatively, the glue solution comprises 60 to 80 parts of the adhesive and 20 to 40 parts of the second solvent, in parts by weight; The adhesive is selected from at least one of methylcellulose and polyethylene glycol; Optionally, the second solvent is selected from ultrapure water.

4. The preparation method according to claim 1, characterized in that: The hydrophilic oil film liquid is composed of 30 to 40 parts of the film-forming substance and 20 parts of a third solvent by weight; Optionally, the third solvent is selected from ultrapure water; Optionally, the hydrophilic oil film liquid further includes a second probiotic agent, and the second probiotic agent is 50 to 40 parts.

5. The preparation method according to claim 1, characterized in that: The primary probiotic composite coating layer formed on the bare fiber surface is: forming a primary probiotic composite coating layer on the surface of the bare fiber after at least one stretching; Alternatively, the bare fiber surface is treated during at least one drawing process to form a primary probiotic composite coating layer.

6. The preparation method according to claim 1, characterized in that: Before forming the primary probiotic composite coating layer on the bare fiber surface, the process also includes: Applying an oil agent on the surface of the bare fiber, then drawing the bare fiber coated with the oil agent at least once, and performing an oven drying treatment on the bare fiber after drawing; The oil agent comprises, by weight, 30 to 50 parts of phosphate, 25 to 35 parts of sulfonate, 25 to 35 parts of succinate, and 20 parts of water; Optionally, the phosphate ester is selected from at least one of monoalkyl phosphate ester and alkyl phosphate triethanolamine; Optionally, the sulfonate is selected from at least one of sodium alkylbenzene sulfonate and sodium alkyl sulfonate; Optionally, the succinate salt is selected from at least one of alkylphenol ether sulfosuccinate sodium salt and succinate sulfonate sodium salt.

7. The preparation method according to claim 1, characterized in that: During intense heat setting, set the speed ratio to 90-99%, the temperature to 90-110°C, and the processing time to 0.2-0.6min; and / or, the steam temperature of the steam heat treatment is 90 to 110° C., and the treatment time is 0.2 to 0.6 min; And / or, the mass ratio of the adhesive to the bare fiber is 0.02-0.05:1, the mass ratio of the first probiotic to the bare fiber is 0.01-0.03:1, and the mass ratio of the hydrophilic oil film liquid to the bare fiber is 0.35-0.5:

1.

8. A probiotic composite fiber, characterized in that: The method is as described in any one of claims 1 to 7.

9. A probiotic non-woven fabric, characterized in that: It is prepared by using the probiotic composite fiber as claimed in claim 8.

10. A sanitary napkin, characterized in that: It comprises the probiotic non-woven fabric as claimed in claim 9.

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