CN114889271B - Hot-rolled non-woven fabric and preparation method thereof - Google Patents

Hot-rolled non-woven fabric and preparation method thereof Download PDF

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CN114889271B
CN114889271B CN202210489265.7A CN202210489265A CN114889271B CN 114889271 B CN114889271 B CN 114889271B CN 202210489265 A CN202210489265 A CN 202210489265A CN 114889271 B CN114889271 B CN 114889271B
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woven fabric
parts
fabric layer
fiber
hot
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CN114889271A (en
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张亚超
曹鹤
候东辉
程志强
王谜
郭月婷
程东杰
魏福萍
刘寒楚
苗瑞华
侯鹏展
孟洁
李银平
徐会芳
张超
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Henan Super Asia Medical Equipment Co ltd
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Henan Super Asia Medical Equipment Co ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B32B5/022—Non-woven fabric
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/02—Layer formed of wires, e.g. mesh
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/14—Layered products comprising a layer of metal next to a fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/04—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the partial melting of at least one layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/06—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the heating method
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B32B5/08—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer the fibres or filaments of a layer being of different substances, e.g. conjugate fibres, mixture of different fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
    • B32B5/24—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer
    • B32B5/26—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer another layer next to it also being fibrous or filamentary
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/10—Interconnection of layers at least one layer having inter-reactive properties
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F8/00—Chemical modification by after-treatment
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F8/00—Chemical modification by after-treatment
    • C08F8/30—Introducing nitrogen atoms or nitrogen-containing groups
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
    • D04H1/4209—Inorganic fibres
    • D04H1/4234—Metal fibres
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
    • D04H1/425—Cellulose series
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
    • D04H1/4282—Addition polymers
    • D04H1/4291—Olefin series
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
    • D04H1/4282—Addition polymers
    • D04H1/43—Acrylonitrile series
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/54—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by welding together the fibres, e.g. by partially melting or dissolving
    • D04H1/558—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by welding together the fibres, e.g. by partially melting or dissolving in combination with mechanical or physical treatments other than embossing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/20—All layers being fibrous or filamentary
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/02—Synthetic macromolecular fibres
    • B32B2262/0253—Polyolefin fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/02—Synthetic macromolecular fibres
    • B32B2262/0276—Polyester fibres
    • B32B2262/0284—Polyethylene terephthalate [PET] or polybutylene terephthalate [PBT]
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/06—Vegetal fibres
    • B32B2262/062—Cellulose fibres, e.g. cotton
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    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
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    • B32B2262/103—Metal fibres
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    • B32B2307/00—Properties of the layers or laminate
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
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Abstract

The invention belongs to the technical field of non-woven fabric manufacturing, and particularly relates to a hot-rolled non-woven fabric and a preparation method thereof. By firstly carboxylating polyacrylonitrile under an acidic condition and then introducing chlorine atoms into 2-phenylbenzimidazole, benzimidazole groups are successfully introduced into a polyacrylonitrile main chain, so that the prepared non-woven fabric has good antibacterial performance; meanwhile, hydrophilic substances are added into the polypropylene in a molten state and are molten and blended to prepare hydrophilic polypropylene, so that the prepared composite non-woven fabric has good hydrophilic water retention performance.

Description

Hot-rolled non-woven fabric and preparation method thereof
Technical Field
The invention belongs to the technical field of non-woven fabric manufacturing, and particularly relates to a hot-rolled non-woven fabric and a preparation method thereof.
Background
The non-woven fabric is a novel fiber product prepared by using high polymer chips, short fibers or long filaments through various fiber web forming methods and consolidation techniques, and is also called non-woven fabric because spinning and weaving are not required in subsequent processing procedures. Common production processes of non-woven fabrics comprise a hot rolling bonding method, a melt blowing method, a needle punching method, a dipping bonding method, a spunbonding method and the like, and the traditional woven filter material has low filtration efficiency and can not reach the standard due to large gaps. The non-woven fabric filter material has small gaps and high filtering effect, so the non-woven fabric filter material gradually replaces the traditional woven and knitted filter material. The non-woven fabric has the advantages of large specific surface area, wide aperture range, corrosion resistance, low cost, high yield and the like, is widely applied to the fields of environmental protection, buildings, medical treatment, clothes, chemical industry, mining industry, automobiles, aerospace industry and the like, and is increasingly applied to the field of biological medical treatment in recent years.
Chinese patent application No. 201510496144.5 discloses a multifunctional hot-rolled non-woven fabric and a preparation method thereof, the multifunctional hot-rolled non-woven fabric comprises a silk fiber non-woven fabric layer and a composite fiber non-woven fabric layer, the composite fiber non-woven fabric layer is clamped between two silk fiber non-woven fabric layers in a hot-rolled bonding mode, the silk fiber non-woven fabric layer is formed by mixing silk fibers subjected to special dyeing treatment and a small amount of ES bonding fibers, and the composite fiber non-woven fabric layer is formed by mixing chitin fibers, metal fibers, cotton fibers and a small amount of ES bonding fibers; through the mode that has increased multiple heat-sensitive material as the non-woven fabrics top layer with in the dyestuff on silk layer with silk layer, not only increased the comfort level of non-woven fabrics, still increased the aesthetic property and the interest of non-woven fabrics, possessed effects such as antibiotic, antistatic and sweat-absorbing simultaneously.
The Chinese patent with the application number of 201811158466.9 discloses a polypropylene spun-bonded non-woven fabric and a preparation process for improving the softness of the polypropylene spun-bonded non-woven fabric, the preparation process comprises pretreatment, die head spinning and hot rolling treatment, and the prepared non-woven fabric is small in hardness, high in softness, not easy to cause abrasion, low in shrinkage rate, stereoscopic in appearance, good in air permeability and capable of improving the anti-rewet performance; the preparation process is simple, convenient to operate and low in energy consumption.
However, when the non-woven fabric is used, the non-woven fabric is often in contact with the outside and contains more dust, bacteria, viruses and the like, so that the non-woven fabric with good anti-bacteria and cleaning effects is urgently needed to be prepared.
Disclosure of Invention
In order to solve the problems, the invention provides a hot-rolled non-woven fabric and a preparation method thereof, which have good dustproof and antibacterial effects and a certain hydrophilic effect.
The technical scheme adopted by the invention for realizing the purpose is as follows:
a hot-rolled non-woven fabric comprises a non-woven fabric composite layer, wherein the non-woven fabric composite layer is formed by sequentially compounding a first non-woven fabric layer, a second non-woven fabric layer and a third non-woven fabric layer;
the first non-woven fabric layer comprises the following components in parts by weight: 60-80 parts of modified polyacrylonitrile fiber and 20-30 parts of ES bonding fiber;
the second non-woven fabric layer comprises the following components in parts by weight: 50-60 parts of polypropylene, 20-30 parts of metal fiber, 20-30 parts of cotton fiber and 20-30 parts of ES bonding fiber;
the third non-woven fabric layer comprises the following components in parts by weight: 30-50 parts of hydrophilic polypropylene and 20-30 parts of ES bonding fiber;
the structural formula of the modified polyacrylonitrile fiber is as follows:
Figure BDA0003630596500000021
further, the preparation method of the modified polyacrylonitrile fiber comprises the following steps:
s1, adding polyacrylonitrile into a dimethylformamide solvent, heating to dissolve, then dropwise adding hydrochloric acid, uniformly stirring, and carrying out reflux reaction to obtain an intermediate I;
s2, adding 2-phenylbenzimidazole into a dimethylformamide solvent, uniformly stirring, adding ferric chloride, uniformly mixing, introducing chlorine, and reacting to obtain an intermediate II;
and S3, mixing the intermediate I and the intermediate II by using triethylamine as a solvent, adding trioctylmethylammonium chloride, uniformly stirring, and performing reflux reaction to obtain the modified polyacrylonitrile fiber.
The invention has the following beneficial effects:
in the preparation process of the composite non-woven fabric, the ES bonding fibers are added in the preparation of each layer of non-woven fabric, and through the hot rolling process, the ES bonding fibers between each layer effectively ensure the bonding strength between each layer and avoid the phenomenon of large thermal shrinkage; in the preparation process of the first non-woven fabric layer, the polyacrylonitrile fiber is modified, the benzimidazole group is successfully grafted to a polyacrylonitrile molecular chain, compared with the preparation method of directly adding 2-phenylbenzimidazole into the raw material, the modified polyacrylonitrile fiber is more favorable for the dispersion of the benzimidazole group in the polyacrylonitrile fiber by using a grafting mode, and the mechanical property of the composite non-woven fabric is effectively improved in the presence of a plurality of rigid groups due to the fact that the plurality of cyclic groups exist in the obtained modified polyacrylonitrile fiber; meanwhile, the benzimidazole group can effectively interfere the splitting process of pathogenic microorganisms, so that the pathogenic microorganisms have better mechanical property and better antibacterial property; the raw materials for preparing the second non-woven fabric layer contain cotton fibers and have good water absorption performance, the raw materials for preparing the third non-woven fabric layer contain hydrophilic polyacrylonitrile and can effectively absorb water, and the second non-woven fabric layer and the third non-woven fabric layer act together, so that the prepared composite non-woven fabric layer has good hydrophilic water retention performance.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The commercially available nonwoven fabric used in the present invention was purchased from composite nonwoven fabric produced by Nantong Jinwei composite Co., ltd; the polyacrylonitrile fibers and polypropylene used in the present invention are purchased from Denaol engineering materials, inc. in salt City.
Example 1
A hot-rolled non-woven fabric comprises a non-woven fabric composite layer, wherein the non-woven fabric composite layer is formed by sequentially compounding a first non-woven fabric layer, a second non-woven fabric layer and a third non-woven fabric layer;
the first non-woven fabric layer comprises the following components in parts by weight: 60 parts of modified polyacrylonitrile fiber and 20 parts of ES bonding fiber; the second non-woven fabric layer comprises the following components in parts by weight: 50 parts of polypropylene, 20 parts of metal fiber, 20 parts of cotton fiber and 20 parts of ES bonding fiber; the third non-woven fabric layer comprises the following components in parts by weight: 30 parts of hydrophilic polypropylene and 20 parts of ES bonding fiber;
the preparation method of the modified polyacrylonitrile fiber comprises the following steps:
s1, adding 65 parts by weight of polyacrylonitrile into 100 parts by weight of dimethylformamide solvent, heating to 35 ℃, stirring for dissolving, slowly dripping 55 parts by weight of hydrochloric acid into the mixture, uniformly stirring, and performing reflux reaction to obtain an intermediate I, wherein the reaction process is as follows:
Figure BDA0003630596500000031
s2, adding 65 parts by weight of 2-phenylbenzimidazole into 100 parts by weight of dimethylformamide solvent, raising the temperature to 40 ℃, uniformly stirring, adding 5 parts by weight of ferric chloride, uniformly mixing, introducing chlorine, and reacting to obtain an intermediate II, wherein the reaction process is as follows:
Figure BDA0003630596500000032
in the reaction process, chlorine molecules are heterolytic under the action of a catalyst, one part of the chlorine attacks a benzene ring, and the other part of the chlorine is combined with the catalyst to complete the reaction.
S3, mixing the obtained intermediate I and the intermediate II by taking 150 parts by weight of triethylamine as a solvent, adding 4 parts by weight of trioctylmethylammonium chloride, keeping the temperature at 15 ℃, uniformly stirring, and performing reflux reaction to obtain the modified polyacrylonitrile fiber, wherein the reaction process is as follows:
Figure BDA0003630596500000041
the preparation method of the water-based polypropylene comprises the following steps: heating polypropylene to a molten state, adding 5 parts by weight of initiator 1, 1-di-tert-butyl peroxy-3, 5-trimethylcyclohexane into 35 parts by weight of polypropylene in the molten state, uniformly mixing, and then sequentially adding 8 parts by weight of sodium dodecyl benzene sulfonate, 6 parts by weight of maleic anhydride and 6 parts by weight of polyethylene glycol octyl phenyl ether for melt blending to obtain the hydrophilic polypropylene.
A preparation method of hot-rolled non-woven fabric comprises the following steps:
t1, preparing a first non-woven fabric layer: weighing raw materials of a first non-woven fabric layer according to parts by weight, uniformly mixing the raw materials, putting the raw materials into a spinning machine, carrying out hot melting and high-pressure extrusion, spinning, air cooling, stretching, immersion, secondary stretching, drying, cutting, adding the raw materials into a fiber opener, carding the non-woven fabric fibers by using a fiber carding machine, processing the fibers into uniform and continuous fibers after carding, continuously processing the fibers by using high-temperature hot air provided by a hot air drying machine, and carrying out hot air melting to bond the fibers with each other to obtain a first non-woven fabric layer; wherein the rotation speed of the carding line is 1300m/min when the fiber carding machine combs; the hot air bonding temperature in hot air processing is 110 ℃, and the hot air bonding speed is 120m/min;
t2, preparing a second non-woven fabric layer: weighing the raw materials of the second non-woven fabric layer according to the parts by weight, mixing and opening the raw materials to prepare mixed fibers, carding the mixed fibers to form a fiber thin web, overlapping 6 fiber thin webs, and pressing the fiber thin webs to form a fiber web through a pressing roller to obtain the second non-woven fabric layer;
t3, preparing a third non-woven fabric layer: weighing the raw materials of the third non-woven fabric layer in parts by weight, and preparing by adopting the process in the step T1 to obtain the third non-woven fabric layer; wherein the rotation speed of the carding line is 1400m/min when the fiber carding machine is carding; the hot air bonding temperature in hot air processing is 120 ℃, and the hot air bonding speed is 125m/min;
t4, hot rollingBonding: respectively putting the prepared first non-woven fabric layer, the second non-woven fabric layer and the third non-woven fabric layer into a hot rolling mill for hot rolling and fusing; wherein the hot rolling fusion conditions are as follows: the temperature of the hot roller is 75 ℃, and the pressure of the hot roller pair is 0.5kg/cm 2 。
T5, winding: and (5) winding the product from the hot rolling mill by edge cutting and length measuring.
Example 2
Compared with the embodiment 1, the raw materials of the non-woven fabric layers have different compositions, and the parameters in the preparation process are as follows:
a hot-rolled non-woven fabric comprises a non-woven fabric composite layer, wherein the non-woven fabric composite layer is formed by sequentially compounding a first non-woven fabric layer, a second non-woven fabric layer and a third non-woven fabric layer;
the first non-woven fabric layer comprises the following components in parts by weight: 80 parts of modified polyacrylonitrile fiber and 30 parts of ES bonding fiber; the second non-woven fabric layer comprises the following components in parts by weight: 60 parts of polypropylene, 30 parts of metal fiber, 30 parts of cotton fiber and 30 parts of ES bonding fiber; the third non-woven fabric layer comprises the following components in parts by weight: 50 parts of hydrophilic polypropylene and 30 parts of ES bonding fiber;
the preparation method of the modified polyacrylonitrile fiber comprises the following steps:
s1, adding 85 parts by weight of polyacrylonitrile into 200 parts by weight of dimethylformamide solvent, heating to 45 ℃, stirring for dissolving, slowly dripping 75 parts by weight of hydrochloric acid into the mixture, uniformly stirring, and performing reflux reaction to obtain an intermediate I;
s2, adding 85 parts by weight of 2-phenylbenzimidazole into 200 parts by weight of dimethylformamide solvent, raising the temperature to 45 ℃, uniformly stirring, adding 15 parts by weight of ferric chloride, uniformly mixing, introducing chlorine, and reacting to obtain an intermediate II; in the reaction process, chlorine molecules are heterolytic under the action of the catalyst, one part of the chlorine attacks a benzene ring, and the other part of the chlorine is combined with the catalyst to complete the reaction.
And S3, mixing the obtained intermediate I and the intermediate II by taking 250 parts by weight of triethylamine as a solvent, adding 14 parts by weight of trioctylmethylammonium chloride, keeping the temperature at 15 ℃, uniformly stirring, and performing reflux reaction to obtain the modified polyacrylonitrile fiber.
The preparation method of the water-based polypropylene comprises the following steps: heating polypropylene to a molten state, adding 10 parts by weight of initiator 1, 1-di-tert-butyl peroxy-3, 5-trimethylcyclohexane into 55 parts by weight of polypropylene in the molten state, uniformly mixing, and then sequentially adding 18 parts by weight of sodium dodecyl benzene sulfonate, 16 parts by weight of maleic anhydride and 16 parts by weight of polyethylene glycol octyl phenyl ether for melt blending to obtain the hydrophilic polypropylene.
A preparation method of hot-rolled non-woven fabric comprises the following steps:
t1, preparing a first non-woven fabric layer: weighing raw materials of a first non-woven fabric layer according to parts by weight, uniformly mixing the raw materials, putting the raw materials into a spinning machine, carrying out hot melting and high-pressure extrusion, spinning, air cooling, stretching, immersion, secondary stretching, drying, cutting, adding the raw materials into a fiber opener, carding the non-woven fabric fibers by using a fiber carding machine, processing the fibers into uniform and continuous fibers after carding, continuously processing the fibers by using high-temperature hot air provided by a hot air drying machine, and carrying out hot air melting to bond the fibers with each other to obtain a first non-woven fabric layer; wherein the carding line rotating speed is 1400m/min when the fiber carding machine is carding; the hot air bonding temperature in hot air processing is 120 ℃, and the hot air bonding speed is 125m/min;
t2, preparing a second non-woven fabric layer: weighing raw materials of a second non-woven fabric layer according to the weight parts, mixing and opening the raw materials to prepare mixed fibers, carding the mixed fibers to form a fiber thin web, overlapping 12 fiber thin webs, and pressing the fiber thin webs to form a fiber web through a pressing roller to obtain the second non-woven fabric layer;
t3, preparing a third non-woven fabric layer: weighing the raw materials of the third non-woven fabric layer in parts by weight, and preparing by adopting the process in the step T1 to obtain the third non-woven fabric layer; wherein the carding line rotating speed is 1500m/min when the fiber carding machine is carding; the hot air bonding temperature is 140 ℃ during hot air processing, and the hot air bonding speed is 135m/min;
t4, hot rolling and bonding: respectively putting the prepared first non-woven fabric layer, the second non-woven fabric layer and the third non-woven fabric layer into a hot rolling mill for hot rolling and fusing; wherein the hot rolling fusion conditions are: the temperature of the hot roller is 85 ℃, and the pressure of the hot roller pair is 1.0kg/cm 2 。
T5, winding: and (5) winding the product from the hot rolling mill by edge cutting and length measuring.
Example 3
Compared with the embodiment 1, the raw materials of the non-woven fabric layers are different in composition, and the parameters in the preparation process are different, specifically:
a hot-rolled non-woven fabric comprises a non-woven fabric composite layer, wherein the non-woven fabric composite layer is formed by sequentially compounding a first non-woven fabric layer, a second non-woven fabric layer and a third non-woven fabric layer;
the first non-woven fabric layer comprises the following components in parts by weight: 70 parts of modified polyacrylonitrile fiber and 25 parts of ES bonding fiber; the second non-woven fabric layer comprises the following components in parts by weight: 55 parts of polypropylene, 25 parts of metal fiber, 25 parts of cotton fiber and 25 parts of ES bonding fiber; the third non-woven fabric layer comprises the following components in parts by weight: 45 parts of hydrophilic polypropylene and 22 parts of ES bonding fiber;
the preparation method of the modified polyacrylonitrile fiber comprises the following steps:
s1, adding 75 parts by weight of polyacrylonitrile into 150 parts by weight of dimethylformamide solvent, heating to 40 ℃, slowly dripping 65 parts by weight of hydrochloric acid after stirring and dissolving, uniformly stirring, and carrying out reflux reaction to obtain an intermediate I;
s2, adding 75 parts by weight of 2-phenylbenzimidazole into 150 parts by weight of dimethylformamide solvent, raising the temperature to 45 ℃, uniformly stirring, adding 10 parts by weight of ferric chloride, uniformly mixing, introducing chlorine, and reacting to obtain an intermediate II; in the reaction process, chlorine molecules are heterolytic under the action of a catalyst, one part of the chlorine attacks a benzene ring, and the other part of the chlorine is combined with the catalyst to complete the reaction.
And S3, mixing the obtained intermediate I and the intermediate II by using 200 parts by weight of triethylamine as a solvent, adding 10 parts by weight of trioctylmethylammonium chloride, keeping the temperature at 15 ℃, uniformly stirring, and performing reflux reaction to obtain the modified polyacrylonitrile fiber.
The preparation method of the water-based polypropylene comprises the following steps: heating polypropylene to a molten state, adding 8 parts by weight of 1, 1-di-tert-butyl peroxy-3, 5-trimethylcyclohexane serving as an initiator into 50 parts by weight of polypropylene in the molten state, uniformly mixing, and then sequentially adding 12 parts by weight of sodium dodecyl benzene sulfonate, 10 parts by weight of maleic anhydride and 10 parts by weight of polyethylene glycol octyl phenyl ether for melt blending to obtain the hydrophilic polypropylene.
A preparation method of hot-rolled non-woven fabric comprises the following steps:
t1, preparing a first non-woven fabric layer: weighing raw materials of a first non-woven fabric layer according to parts by weight, uniformly mixing the raw materials, putting the raw materials into a spinning machine, carrying out hot melting and high-pressure extrusion, spinning, air cooling, stretching, immersion, secondary stretching, drying, cutting, adding the raw materials into a fiber opener, carding the non-woven fabric fibers by using a fiber carding machine, processing the fibers into uniform and continuous fibers after carding, continuously processing the fibers by using high-temperature hot air provided by a hot air drying machine, and carrying out hot air melting to bond the fibers with each other to obtain a first non-woven fabric layer; wherein the rotation speed of the carding line is 1300m/min when the fiber carding machine combs; the hot air bonding temperature in hot air processing is 110 ℃, and the hot air bonding speed is 120m/min;
t2, preparing a second non-woven fabric layer: weighing raw materials of a second non-woven fabric layer according to the weight parts, mixing and opening the raw materials to prepare mixed fibers, carding the mixed fibers to form a fiber thin web, overlapping 8 layers of the fiber thin webs, and pressing the fiber thin webs to form a fiber web through a pressing roller to obtain the second non-woven fabric layer;
t3, preparing a third non-woven fabric layer: weighing the raw materials of the third non-woven fabric layer in parts by weight, and preparing by adopting the process in the step T1 to obtain the third non-woven fabric layer; wherein the rotation speed of the carding line is 1400m/min when the fiber carding machine is carding; the hot air bonding temperature is 120 ℃ during hot air processing, and the hot air bonding speed is 125m/min;
t4, hot rolling and bonding: respectively putting the prepared first non-woven fabric layer, the second non-woven fabric layer and the third non-woven fabric layer into a hot rolling mill for hot rolling and fusing; wherein the hot rolling fusion conditions are as follows: the temperature of the hot roller is 80 ℃, and the pressure of the hot roller pair is 1.2kg/cm 2 。
T5, winding: and (5) winding the product from the hot rolling mill by edge cutting and length measuring.
Comparative example 1
Compared with the example 3, in the first non-woven fabric layer, the modacrylic fiber is replaced by the intermediate I, the other conditions are not changed, and the specific raw materials and the preparation method refer to the example 3.
Comparative example 2
Compared with example 3, in the first nonwoven fabric layer, the polyacrylonitrile fiber is not modified, and the commercially available polyacrylonitrile fiber is directly used, and the other conditions are not changed, and the specific raw materials and the preparation method refer to example 3.
Comparative example 3
In comparison with example 3, in the third nonwoven fabric layer, commercially available polypropylene was used as it is without hydrophilic modification, and the specific raw materials and preparation method were as in example 3 except that the conditions were not changed.
Comparative example 4
Compared with example 3, in the first nonwoven fabric layer, the commercially available polyacrylonitrile fiber was directly used without modifying the polyacrylonitrile fiber, and in the third nonwoven fabric layer, the commercially available polypropylene was directly used without hydrophilic modification of the polypropylene, and the specific raw materials and preparation method were as in example 3.
Comparative example 5
Compared with the example 3, in the preparation process of the modified polyacrylonitrile of the first non-woven fabric layer, wherein in the preparation process of the intermediate II, the chlorine gas is replaced by the liquid bromine, and the other conditions are not changed, the specific raw materials and the preparation method refer to the example 3.
Comparative example 6
Compared with the example 3, the raw materials of the first non-woven fabric layer are changed into: 75 parts of polyacrylonitrile fiber, 75 parts of 2-phenylbenzimidazole and 25 parts of ES bonding fiber; in the preparation process, the polyacrylonitrile fiber, the 2-phenylbenzimidazole and the ES adhesive fiber are directly mixed without modifying the polyacrylonitrile fiber. The remaining conditions were unchanged, and the specific starting materials and preparation were as in example 3.
And (4) relevant performance test:
1. testing the hydrostatic pressure by using a hydrostatic pressure tester;
2. test of dust-proof effect
The nonwoven fabrics (1 m × 1m in size) prepared in examples 1 to 3 and comparative examples 1 to 6 were placed in an empty room, wherein the content of respirable particles ≧ 0.2 μm in the room was controlled to 0.068mg/m 3 The room area was 10m × 10m, and the surface dust deposition was observed after standing for 24 hours, 48 hours, and 72 hours, respectively.
The relevant test performance is shown in table 1.
TABLE 1
Figure BDA0003630596500000071
Figure BDA0003630596500000081
As can be seen from the data in the table, the hydrostatic pressures of examples 1-3 and comparative example 3 are greater than those of comparative examples 1-2 and comparative examples 4-6, which shows that the strength of the nonwoven fabrics prepared by examples 1-3 and comparative example 3 is large, and the test data of comparative example 3 and example 3 can show that the existence of the modified polyacrylonitrile can effectively increase the strength of the nonwoven fabrics; as can be seen from the results of the tests of the molding rate and the defective rate, examples 1 to 3 and comparative examples 1 to 5 were high in molding rate and not high in defective rate as a whole, indicating that each of the schemes had a high material utilization rate during the preparation process, while comparative example 6 had the largest defective rate, which was probably due to the fact that 2-phenylbenzimidazole could not be well fused with polyacrylonitrile fibers and ES binder fibers after directly mixing the 2-phenylbenzimidazole therewith, resulting in an increase in defective rate; the dust-proof effect of the embodiments 1-3 and the comparative example 3 is obviously better than that of the comparative example 2 and the comparative example 4, which shows that the existence of the modified polyacrylonitrile enables the prepared non-woven fabric to have good dust-proof effect, the comparative examples 5-6 have poorer dust-proof effect compared with the embodiments 1-3, in the comparative example 5, in the preparation process of the intermediate II, chlorine gas is replaced by liquid bromine to form bromophenyl benzimidazole, and because the bromine atom has larger atomic radius and larger steric hindrance compared with the chlorine atom, steric hindrance is formed, so that two adjacent atoms form overlapped electron clouds when reacting with the carboxylated polyacrylonitrile, repulsive force is formed to mutually repel, and the intermolecular reaction is influenced. When the chlorophenyl benzimidazole is adopted to react with the carboxylated polyacrylonitrile, the atomic radius of a chlorine atom is relatively small, so that the chlorophenyl benzimidazole has small steric hindrance, and can effectively react with the carboxylated polyacrylonitrile, so that the finally prepared modified polyacrylonitrile has better performance; in comparative example 6, polyacrylonitrile, 2-phenylbenzimidazole, and ES binder fiber were directly mixed without modifying polyacrylonitrile in the process of preparing the first nonwoven fabric layer, and the presence of unevenly distributed 2-phenylbenzimidazole reduced the dust-proof effect of the nonwoven fabric.
3. Test of antibacterial Property
The antibacterial performance of the prepared non-woven fabric is detected by adopting an AATCC100 antibacterial textile evaluation method, and the detected strains are escherichia coli and staphylococcus aureus.
Sample preparation: the nonwoven fabrics prepared in examples 1 to 3 and comparative examples 1 to 6 were cut into disks having a diameter of about 4.5cm, which were sequentially placed in a petri dish subjected to high-temperature sterilization treatment, and marked for future use. A plain nonwoven fabric was prepared as a blank control in the same manner.
The experimental process comprises the following steps: respectively activating Escherichia coli and Staphylococcus aureus with TSB culture medium, streaking into beef extract solid culture medium, diluting with 0.85% frozen normal saline (0-4 deg.C), inoculating strain from about 10% 8 ～10 9 Dilution to 1X 10 cfu/mL 5 ～2×10 5 cfu/mL, preparing an inoculation bacterial liquid, sucking 1.0mL of the inoculation bacterial liquid by a suction pipe, slowly inoculating the inoculation bacterial liquid on a sterile sample to ensure that the inoculation bacterial liquid is uniformly distributed and fully absorbed, and counting after culturing for 18 hours in a constant-temperature incubator at 37 ℃, wherein the calculation formula of the bacteriostasis rate is as follows:
bacteriostatic rate (%) = (blank control group viable bacteria count after 18 h-sample viable bacteria count after 18 h)/control group viable bacteria count after 18h x 100%.
The test results are shown in table 2.
TABLE 2
Figure BDA0003630596500000091
The test result of the blank control group is as follows: the Escherichia coli content is 2.0 × 10 7 cfu/mL, 3.8X 10 Staphylococcus aureus 6 cfu/mL。
As can be seen from the test results, the non-woven fabrics prepared in the examples 1 to 3 and the comparative example 3 have the antibacterial rate of over 99 percent on escherichia coli and staphylococcus aureus, and have a good antibacterial effect. The bacteriostatic effect of the comparative examples 1-2 and 5 is relatively poor, the bacteriostatic effect of the comparative example 4 is the worst, and the test results of the comparative examples 1-2, 4 and 3 show that the bacteriostatic effect can be effectively improved due to the modified polyacrylonitrile, compared with the example 3, in the preparation process of the modified polyacrylonitrile, the bacteriostatic effect is reduced after the chlorine is replaced by the liquid bromine in the comparative example 5; compared with example 33, the 2-phenylbenzimidazole is directly mixed with other raw materials, so that the 2-phenylbenzimidazole cannot be uniformly distributed easily, and the bacteriostatic effect is reduced.
4. Test of hydrophilic Water Retention Performance
The nonwoven fabrics prepared in examples 1 to 3 and comparative examples 1 to 6 were immersed in distilled water under the same conditions to conduct the hydrophilic water retention property test, and the test results are shown in table 3.
TABLE 3
Figure BDA0003630596500000101
The test data show that the non-woven fabrics prepared in the examples 1-3 and the comparative examples 1-2 and 5 have better hydrophilic performance and still maintain higher water retention rate within 30min, while the hydrophilic performance of the comparative examples 3-4 and the comparative example 6 is poorer, which indicates that the modified polypropylene has better hydrophilic performance, and the hydrophilic water retention performance of the non-woven fabrics is reduced due to the uneven distribution and poor fusion of all substances in the raw materials.
5. Mechanical Property test
The nonwoven fabrics prepared in examples 1 to 3 and comparative examples 1 to 6 were subjected to mechanical property tests, in which the bending length and bending rigidity were measured in accordance with GB/T18318.1-2009, and the sample size was 25mm × 200mm (width × length), the shorter the bending length, the smaller the bending rigidity, indicating the better softness of the nonwoven fabric; the breaking strength and elongation at break were measured in accordance with GB/T3923.1-2013, and the results are shown in Table 4.
TABLE 4
Figure BDA0003630596500000111
As can be seen from the above test results, the nonwoven fabrics prepared in examples 1 to 3 are superior to those prepared in comparative examples 1 to 6 in both bending length and bending rigidity, indicating that the nonwoven fabrics prepared in the present invention have superior softness; and the breaking strength and the breaking elongation of the non-woven fabrics prepared in examples 1 to 3 are superior to those of the comparative example, which shows that the non-woven fabrics prepared in examples 1 to 3 have stronger mechanical properties.
The ES bonding fiber is a thermal bonding composite fiber, has good bonding performance after being heated, has small thermal shrinkage rate, and can still maintain the porosity in the fiber layer after hot rolling.
The polyacrylonitrile is obtained by monomer acrylonitrile through free radical polymerization reaction, and has the characteristics of good weather resistance and good sun resistance, the polyacrylonitrile is carboxylated under an acidic condition, chlorine is introduced into 2-phenylbenzimidazole, chlorine molecules are subjected to heterolysis under the action of ferric trichloride, one part of the chlorine attacks a benzene ring, chlorine atoms are successfully introduced into the 2-phenylbenzimidazole, benzimidazole groups are successfully introduced into a polyacrylonitrile main chain under the action of trioctylmethylammonium chloride, and the existence of the benzimidazole groups can effectively interfere the mitosis process of pathogenic microorganisms, inhibit the formation of spindles and influence the cell division process of the pathogenic microorganisms, so that the prepared non-woven fabric has good antibacterial performance; if the 2-phenylbenzimidazole is directly mixed with the polyacrylonitrile fibers and the ES bonding fibers, the mechanical performance of the prepared non-woven fabric is greatly reduced because the 2-phenylbenzimidazole is difficult to uniformly disperse in the blend of the polyacrylonitrile fibers and the ES bonding fibers, and meanwhile, the antibacterial performance is also influenced and the antibacterial effect is reduced because the 2-phenylbenzimidazole is not uniformly distributed; on the other hand, due to the existence of a plurality of cyclic groups in the modified polyacrylonitrile fiber, the prepared modified polyacrylonitrile forms a network structure, the cross-linking effect among molecules is enhanced, and meanwhile, due to the existence of more cyclic groups as the cyclic groups are rigid groups, the mechanical property of the synthetic substance is effectively improved, and the synthetic substance has a certain self-cleaning effect; in the preparation process of the intermediate II, chlorine is adopted to modify 2-phenylbenzimidazole to obtain chlorophenyl benzimidazole, and compared with bromine atom, the chlorine atom has smaller atomic radius, smaller steric hindrance and smaller steric hindrance, so that the reaction rate can be effectively improved, the reaction with carboxylated polyacrylonitrile is facilitated, benzimidazole groups are uniformly present among polyacrylonitrile molecular chains, and the benzimidazole groups have better antibacterial performance;
in addition, in the preparation process of the third non-woven fabric layer, hydrophilic substances are added into polypropylene in a molten state and are melted and blended to prepare hydrophilic polypropylene, so that the prepared composite non-woven fabric has better hydrophilic water retention performance, when the composite non-woven fabric is in contact with a human body, sweat or breath of the human body can be absorbed and kept dry in time, and the use experience of people is improved.
It should be noted that, in this document, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present application have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the application, the scope of which is defined in the appended claims and their equivalents.

Claims (3)

1. A hot-rolled non-woven fabric comprises a non-woven fabric composite layer, and is characterized in that the non-woven fabric composite layer is formed by sequentially compounding a first non-woven fabric layer, a second non-woven fabric layer and a third non-woven fabric layer;
the first non-woven fabric layer comprises the following components in parts by weight: 60-80 parts of modified polyacrylonitrile fiber and 20-30 parts of ES bonding fiber;
the second non-woven fabric layer comprises the following components in parts by weight: 50-60 parts of polypropylene, 20-30 parts of metal fiber, 20-30 parts of cotton fiber and 20-30 parts of ES bonding fiber;
the third non-woven fabric layer comprises the following components in parts by weight: 30-50 parts of hydrophilic polypropylene and 20-30 parts of ES bonding fiber;
the structural formula of the modified polyacrylonitrile fiber is as follows:
Figure 755703DEST_PATH_IMAGE002
；
the preparation method of the modified polyacrylonitrile fiber comprises the following steps:
s1, adding polyacrylonitrile into a dimethylformamide solvent, heating to dissolve, then dropwise adding hydrochloric acid into the solvent, uniformly stirring, and carrying out reflux reaction to obtain an intermediate I;
s2, adding 2-phenylbenzimidazole into a dimethylformamide solvent, uniformly stirring, adding ferric chloride, uniformly mixing, introducing chlorine, and reacting to obtain an intermediate II;
s3, mixing the intermediate I and the intermediate II by using triethylamine as a solvent, adding trioctylmethylammonium chloride, uniformly stirring, and performing reflux reaction to obtain modified polyacrylonitrile fibers;
the structural formula of the intermediate I is as follows:
Figure 594215DEST_PATH_IMAGE004
；
the structural formula of the intermediate II is as follows:
Figure 46056DEST_PATH_IMAGE006
；
the preparation method of the hydrophilic polypropylene comprises the following steps: under the molten state, 1-di-tert-butyl peroxy-3, 5-trimethylcyclohexane is added into polypropylene, after being uniformly mixed, sodium dodecyl benzene sulfonate, maleic anhydride and polyethylene glycol octyl phenyl ether are sequentially added for melt blending, and hydrophilic polypropylene is obtained.
2. The method for preparing a hot-rolled non-woven fabric according to claim 1, wherein the preparation process comprises the following steps:
t1, preparing a first non-woven fabric layer: weighing the raw materials of the first non-woven fabric layer according to the parts by weight, uniformly mixing the raw materials, feeding the mixture into a spinning machine, performing hot melting and high-pressure extrusion, spinning, air cooling, stretching, immersion, secondary stretching, drying, cutting off, adding the mixture into a fiber opener, carding, processing into uniform and continuous fibers, and performing hot air melting by using a hot air dryer to obtain a first non-woven fabric layer;
t2, preparing a second non-woven fabric layer: weighing the raw materials of the second non-woven fabric layer according to the parts by weight, mixing and opening the raw materials to prepare mixed fibers, carding the mixed fibers to form a fiber thin web, and pressing the fiber thin web into a fiber web by a pressing roller to obtain a second non-woven fabric layer;
t3, preparing a third non-woven fabric layer: weighing the raw materials of the third non-woven fabric layer in parts by weight, and preparing by adopting the process in the step T1 to obtain the third non-woven fabric layer;
t4, hot rolling and bonding: respectively putting the prepared first non-woven fabric layer, the second non-woven fabric layer and the third non-woven fabric layer into a hot rolling mill for hot rolling and fusing;
t5, winding: and (5) winding the product from the hot rolling mill by edge cutting and length measuring.
3. The method for preparing a hot-rolled non-woven fabric according to claim 2, wherein the conditions for the hot-rolling fusion in the step T4 are as follows: the temperature of the hot roller is 75-85 ℃, and the pressure of the hot roller pair is 0.5-1.0kg/cm 2 。
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