CN110725067A - Nonwoven fabric and method for producing same - Google Patents
Nonwoven fabric and method for producing same Download PDFInfo
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- CN110725067A CN110725067A CN201911152384.8A CN201911152384A CN110725067A CN 110725067 A CN110725067 A CN 110725067A CN 201911152384 A CN201911152384 A CN 201911152384A CN 110725067 A CN110725067 A CN 110725067A
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- 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
- D04H1/4382—Stretched reticular film fibres; Composite fibres; Mixed fibres; Ultrafine fibres; Fibres for artificial leather
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
- D01F6/02—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D01F6/04—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolymers obtained by reactions only involving carbon-to-carbon unsaturated bonds from polyolefins
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
- D01F6/28—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from copolymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D01F6/30—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from copolymers obtained by reactions only involving carbon-to-carbon unsaturated bonds comprising olefins as the major constituent
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M11/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising
- D06M11/73—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with carbon or compounds thereof
- D06M11/76—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with carbon or compounds thereof with carbon oxides or carbonates
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M2101/00—Chemical constitution of the fibres, threads, yarns, fabrics or fibrous goods made from such materials, to be treated
- D06M2101/16—Synthetic fibres, other than mineral fibres
- D06M2101/18—Synthetic fibres consisting of macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D06M2101/20—Polyalkenes, polymers or copolymers of compounds with alkenyl groups bonded to aromatic groups
Abstract
The invention discloses a non-woven fabric and a production method thereof. The non-woven fabric of the invention has ribbon-type fibers which are mutually overlapped, the ribbon-type fibers are distributed in a fluffy manner in the thickness direction of the non-woven fabric, and the cross section of the non-woven fabric is provided with an airflow channel formed by holes with the pore diameter distribution of 0.1-2.5 mu m. The non-woven fabric has good air permeability.
Description
Technical Field
The invention relates to a non-woven fabric and a production method thereof, in particular to a waterproof and breathable non-woven fabric and a production method thereof.
Background
Waterproof breathable materials currently appear in four generations of products: the first generation products are textile materials with waterproof glue covered on the surface; the second generation product is a waterproof breathable material formed by compounding a polyurethane film and a substrate material; the third generation products are thermoplastic polyurethane elastomer films, such as waterproof game clothing fabrics disclosed in CN 108556438A; the fourth generation product is a polytetrafluoroethylene waterproof breathable film formed by biaxially stretching hot bulk polytetrafluoroethylene, such as waterproof breathable garment fabric disclosed in CN 208211551U. The first to third generation waterproof and breathable materials have the problem of poor breathability, the fourth generation waterproof and breathable material is widely applied at present, but the polytetrafluoroethylene waterproof and breathable material is weak in mechanical strength and cannot be used independently, so that the fabric is high in gram weight, complex in process and high in manufacturing cost.
The non-woven fabric is also called non-woven fabric, is formed from directional or random fibre, and possesses the characteristics of moisture-proofing, air-permeability, flexibility, light weight, no combustion-supporting, easy decomposition, non-toxic, non-irritant, rich colour, low cost and can be cyclically used. The non-woven fabric is simple in preparation process and suitable for industrial production.
Disclosure of Invention
An object of the present invention is to provide a nonwoven fabric which is waterproof and has good air permeability. Furthermore, the non-woven fabric has higher mechanical strength. The invention also aims to provide a production method of the non-woven fabric, which is simple in process and suitable for industrial production. The technical scheme is adopted to achieve the purpose.
The invention provides a non-woven fabric, which comprises ribbon type fibers which are mutually overlapped, wherein the ribbon type fibers are distributed in a fluffy manner in the thickness direction of the non-woven fabric, and an airflow channel formed by holes with the pore diameter distribution of 0.1-2.5 mu m is arranged on the cross section of the non-woven fabric.
According to the nonwoven fabric of the present invention, preferably, the thickness of the ribbon-type fibers is 0.2 to 3 μm, and the width thereof is 2 to 25 μm; and the ratio of width to thickness is greater than 2.
According to the non-woven fabric, the gram weight of the non-woven fabric is preferably 30-90 g/m2。
According to the non-woven fabric, the porosity of the non-woven fabric is preferably 68-80%.
According to the nonwoven fabric of the present invention, preferably, the ribbon fiber is selected from one or more of polypropylene fiber, polyethylene fiber, and polyphenylene sulfide fiber.
The invention also provides a production method of the non-woven fabric, which comprises the following steps:
(1) forming the spinning solution into nascent fiber;
(2) spraying a modifying solution containing particles and a surfactant on the nascent fiber to obtain a modified nascent fiber; d of the particulate matter900.1 to 3 μm;
(3) depositing the modified nascent fibers on a lapping transfer system to form a deposit containing particulate matter and ribbon fibers; the particles and the ribbon-type fibers are arranged in a staggered mode, so that the ribbon-type fibers are distributed in a fluffy mode in the thickness direction of the non-woven fabric, and a large number of holes are formed among the ribbon-type fibers due to the existence of the particles;
(4) and removing the particles in the sediment to obtain the non-woven fabric.
According to the production method of the present invention, preferably, in the step (2), the modification solution is sprayed in the form of aerosol; the solvent of the modified solution is a mixed solution of ethanol and water, and the volume ratio of the ethanol to the water is 1-0.01: 100.
According to the production method of the present invention, preferably, in the step (2), the particulate matter is selected from one or more of titanium dioxide, silica, alumina, silicate, carbonate, polymethyl methacrylate, polyvinylpyrrolidone, polystyrene, polyethylene glycol, polydimethylsiloxane, polylactic acid-glycolic acid copolymer, and chitosan; the content of the particulate matters in the modified solution is 0.1-20 wt%.
According to the production method of the present invention, preferably, in the step (2), the surfactant is one or more selected from the group consisting of polyvinylpyrrolidone, polyethylene oxide, sodium dodecylbenzenesulfonate, sodium hepatocholate, sodium stearyl sulfate, sodium stearate, and quaternary ammonium salts.
According to the production method of the present invention, preferably, in step (4), the deposit is washed with an aqueous solution of an inorganic acid to remove the particulate matter.
The non-woven fabric has the ribbon type fibers which are mutually overlapped, the fibers are distributed in a fluffy manner in the thickness direction of the non-woven fabric, holes are formed among the fibers, and the holes can not allow water to pass through but allow gas to pass through, so that the non-woven fabric has good waterproof and air permeability. According to the preferred technical scheme of the invention, the non-woven fabric has good mechanical property.
Drawings
FIG. 1 is a schematic view of a nonwoven fabric containing particulate matter;
fig. 2 is a schematic structural view of the non-woven fabric containing no particulate matter according to the present invention.
The reference numerals are explained below:
1-ribbon fiber; 2-granules; 3-air flow channel.
Detailed Description
The present invention will be further described with reference to the following specific examples, but the scope of the present invention is not limited thereto.
< nonwoven Fabric >
The nonwoven fabric of the present invention has ribbon-type fibers stacked on each other, the ribbon-type fibers being distributed loosely in the thickness direction of the nonwoven fabric, and the nonwoven fabric having an airflow channel formed by holes in the cross section thereof. In fact, the process of stacking the ribbon fibers on top of each other creates some voids. The presence of particulate matter also creates more voids. Although the particulate matter is removed, some voids remain. The holes are communicated with each other to form an air flow channel. This improves the breathability of the nonwoven.
In the present invention, the pore size distribution of the pores may be 0.1 to 2.5 μm, preferably 0.1 to 2.0 μm, and more preferably 0.5 to 2.0 μm. The pore size distribution refers to the percentage of pore sizes by number or volume of the various stages present in the nonwoven fabric. The pore size distribution of the pores is not strictly limited in the present invention, as long as the pore size of most of the pores is within the above range. For example, the pore diameter of at least 50 vol% of the pores is in the above range; preferably, the pore diameter of at least 70 vol% of the pores is in the above range; more preferably, the pore diameter of at least 90 vol% of the pores is in the above range. Thus, the air permeability and the mechanical property of the non-woven fabric can be considered. The pore size distribution of the pores is controlled in the above range so that they are much smaller than the diameter of the mist (20 μm) but much larger than the diameter of the water vapor (0.0004 μm). Thus, water vapor is permeable, but water is not. Thus, the waterproof breathable non-woven fabric for the clothes is ideal.
In the present invention, a ribbon means an object having a width significantly larger than a thickness, and thus a ribbon-type fiber is different from a general fiber having a circular cross section. The width of the cross section of the ribbon fiber is significantly greater than the thickness. In particular, the ratio of width to thickness is greater than 2, preferably greater than 3, more preferably greater than 5. The ribbon fiber can be obtained by flash evaporation, spun-bonding and other processes. The thickness of the ribbon-type fiber may be 0.2 to 3 μm, preferably 0.5 to 2 μm, and more preferably 1 to 2 μm. The width of the ribbon-type fiber may be 2 to 25 μm, preferably 5 to 20 μm, and more preferably 15 to 20 μm. Thus, proper holes can be formed among the ribbon fibers, and the air permeability and the mechanical strength of the non-woven fabric are ensured.
According to one embodiment of the present invention, the thickness of the ribbon-type fiber is 0.2 to 3 μm, and the width is 2 to 25 μm; and the ratio of width to thickness is greater than 2. According to a preferred embodiment of the present invention, the ribbon fiber has a thickness of 1.25 to 1.5 μm, a width of 12 to 15 μm, and a ratio of the width to the thickness of more than 5.
The ribbon fiber of the present invention may be selected from one or more of polypropylene fiber, polyethylene fiber, and polyphenylene sulfide fiber. Preferably, the ribbon fiber is selected from one or more of polyethylene fiber and polyphenylene sulfide fiber. More preferably, the ribbon fiber is a polyethylene fiber. These fibrous materials can ensure the air permeability and mechanical properties of the nonwoven fabric.
The gram weight of the non-woven fabric is 30-90 g/m2Preferably 50 to 72g/m2More preferably 55 to 65g/m2. The thickness of the nonwoven fabric of the present invention is 0.2 to 0.5. mu.m, preferably 0.2 to 0.4. mu.m, and more preferably 0.2 to 0.3. mu.m. The porosity of the non-woven fabric is 68-80%, preferably 68-72%, and more preferably 70-72%. Thus, the air permeability and mechanical properties of the nonwoven fabric can be ensured. Porosity is the holes formed by the loose distribution of the ribbon-type fibersVolume to nonwoven volume ratio.
< production method >
The production method of the non-woven fabric comprises the following steps: (1) forming the spinning solution into nascent fiber; (2) spraying a modifying solution containing particles and a surfactant on the nascent fiber to obtain a modified nascent fiber; (3) depositing the modified nascent fibers on a lapping transfer system to form a deposit containing particulate matter and ribbon fibers; (4) and removing the particles in the sediment to obtain the non-woven fabric.
In the step (1), the spinning solution is formed into nascent fiber. The "as-spun fiber" of the present invention means a fiber state in which the spinning solution is not yet solidified into a formed fiber after being ejected from the spinneret. Preferably, the dope is formed into a nascent fiber by a flash evaporation process or a spunbond process. More preferably, the nascent fibers of the invention are prepared by flash evaporation. The dope is formed from a fiber-forming polymer and a solvent. The fiber-forming polymer in the spinning solution can be selected from one or more of polypropylene, polyethylene and polyphenylene sulfide. Preferably, the fiber-forming polymer is polyphenylene sulfide or polyethylene. More preferably, the fiber-forming polymer is polyethylene. These polymers are particularly well suited for forming ribbon-type fibers and are prone to hole formation. According to a particular embodiment of the invention, the fiber-forming polymer is a linear polyethylene. The concentration of the fiber-forming polymer in the spinning solution can be 5-25 wt%, preferably 8-20 wt%, and more preferably 10-15 wt%. This facilitates the attachment of the particulate matter to the surface of the nascent fiber. By "attached" is meant that there is a strong bonding force between the two and the particulate matter does not easily fall off the surface of the ribbon fiber.
In the step (1), the solvent in the spinning solution can be one or more of dichloromethane, dichloroethane, n-pentane, fluorodichloromethane, fluorotrichloromethane or n-hexane; preferably dichloromethane or dichloroethane. According to one embodiment of the present invention, the spinning solution is a dichloromethane solution having a linear polyethylene concentration of 5 to 25 wt%. This facilitates the attachment of the particulate matter to the surface of the nascent fiber.
In the step (2), a modifying solution containing particles and a surfactant is sprayed on the nascent fiber to obtain the modified nascent fiber. The modifying solution may be sprayed on the nascent fiber in the form of an aerosol. According to one embodiment of the present invention, the modifying solution is atomized by the atomizing device and sprayed by the carrier gas, so as to obtain the aerosol with good dispersion. And placing a nozzle of the aerosol in a cooling spinning area, and attaching the particulate matters to the nascent fiber in the process of cooling the nascent fiber to obtain the modified nascent fiber.
The method of preparing the modified solution is not particularly limited. The modifying solution comprises particles, a solvent and a surfactant. And uniformly mixing the particles, the solvent and the surfactant to obtain the modified solution. The order of mixing the particulate matter, the solvent and the surfactant is not particularly limited.
In the step (2), D of modifying the particles in the solution90Can be 0.1 to 3 μm. Preferably, D of particulate matter900.5 to 2 μm. More preferably, D of particulate matter 901 to 2 μm. D90The particle size of the sample is indicated by the cumulative particle size distribution of 90%. The nonwoven fabric thus obtained has good air permeability and mechanical properties. The particulate matter of the present invention may be screened by a cyclonic ion separation device or screen.
The particles of the present invention may be selected from organic particles or inorganic particles. Examples of inorganic particulates include, but are not limited to, titanium dioxide, silica, alumina, silicates, carbonates. The silicate may be calcium silicate, magnesium silicate, potassium silicate or sodium silicate. The carbonate may be calcium carbonate or magnesium carbonate. Examples of organic particulates include, but are not limited to, polymethyl methacrylate, polyvinylpyrrolidone, polystyrene, polyethylene glycol, polydimethylsiloxane, polylactic-co-glycolic acid, chitosan. Preferably, the particulate matter is at least one of a silicate or a carbonate. More preferably, the particulate material is calcium carbonate. In this way, the particulate matter can be both well attached to the primary fibers and removed by specific treatments.
The content of the particulate matter in the modification solution can be 0.1-20 wt%. Preferably, the content of the particulate matter is 0.5 to 10 wt%. More preferably, the content of the particulate matter is 0.5 to 1.5 wt%. Therefore, the air permeability of the non-woven fabric can be enhanced, and the mechanical strength of the non-woven fabric is ensured.
The solvent in the modification solution may be alcohol and/or water. The alcohol may be selected from one or more of methanol, ethanol, propanol or isopropanol; preferably ethanol, water, or a mixture of ethanol and water; more preferably a mixture of ethanol and water. In the mixed liquid of ethanol and water, the volume ratio of ethanol to water can be 1-0.01: 100, preferably 1-0.1: 10, and more preferably 1-1: 5. This facilitates dispersion of the particulate matter and its attachment to the nascent fiber.
Examples of surfactants in the modification solution include, but are not limited to, one or more of polyvinylpyrrolidone, polyethylene oxide, sodium dodecylbenzenesulfonate, sodium hepatocholate, sodium stearyl sulfate, sodium stearate, quaternary ammonium salts. The quaternary ammonium salt can be one or more selected from alkyl trimethyl ammonium salt, dialkyl dimethyl ammonium salt and pyridinium salt. Preferably, the surfactant is selected from one or more of polyvinylpyrrolidone, polyethylene oxide, and sodium dodecylbenzenesulfonate. More preferably, the surfactant is polyvinylpyrrolidone. The amount of the surfactant is a conventional amount and will not be described herein. This facilitates dispersion of the particulate matter and its attachment to the nascent fiber.
According to one embodiment of the present invention, in the step (2), the modifying solution is sprayed in the form of aerosol; the solvent of the modified solution is a mixed solution of ethanol and water, and the volume ratio of the ethanol to the water is 1-0.01: 100.
According to an embodiment of the present invention, in the step (2), the particulate matter is selected from one or more of titanium dioxide, silicon dioxide, aluminum oxide, silicate, carbonate, polymethyl methacrylate, polyvinylpyrrolidone, polystyrene, polyethylene glycol, polydimethylsiloxane, polylactic acid-glycolic acid copolymer, and chitosan; in the solution containing the particles, the content of the particles in the modified solution is 0.1-20 wt%.
In step (3), the modified nascent fibers are deposited on a lapping transfer system to form a deposit containing particulate matter and ribbon fibers. The modified nascent fibers are deposited on a laydown transfer system under the direction of a spinning gas stream. On the laydown transfer system, the as-spun fibers form ribbon fibers and are superimposed on each other. The particles and the ribbon-type fibers are arranged in a staggered mode, so that the ribbon-type fibers are distributed in a fluffy mode in the thickness direction of the non-woven fabric, and a large number of holes are formed among the ribbon-type fibers due to the existence of the particles.
And (4) removing the particles in the sediment to obtain the non-woven fabric. Specifically, the deposit is washed with water or an aqueous solution of an inorganic acid to remove the particulate matter. The inorganic acid of the inorganic acid aqueous solution may be hydrochloric acid, sulfuric acid, or nitric acid. Preferably, the aqueous mineral acid is hydrochloric acid. The pH value of the hydrochloric acid can be 1-3; preferably 1-2; more preferably 1. Thus, the particle removal is facilitated, and the mechanical property of the non-woven fabric is ensured. After the particles are removed from the ribbon-type fibers, partial holes still remain among the ribbon-type fibers, and new holes are formed after the particles are removed. After being cleaned, the non-woven fabric is softer and is more suitable for being used as a garment material.
The production method of the present invention may further comprise the steps of washing with water and drying. The water washing is carried out by a conventional operation to remove the remaining washing liquid. The drying temperature can be 60-95 ℃, preferably 70-90 ℃, and more preferably 75-85 ℃.
The test methods of the following examples and comparative examples are illustrated below:
gram weight: the measurement was carried out by using GB/T24218.1-2009.
Radial tensile strength: the measurement was carried out by GB/T24218.3-2010.
Weft tensile strength: the test was carried out using GB/T24218.3-2010.
Tear strength: the test is carried out by GB/T3917.3-2009.
Thickness: the assay was performed using EN 20534.
Density: the density is calculated from the grammage and thickness data of the nonwoven fabric.
Porosity: the porosity (fiber material density-nonwoven density)/fiber material density is calculated from the density of the nonwoven fabric and the density of the fiber material.
Water vapor transmission amount: testing was performed using ASTM F1249.
The maximum bearable hydrostatic pressure: test according to AATCC TM 127Example 1
Mixing calcium carbonate particles (D)902 μm) was dispersed in a mixed solution of ethanol and water (volume ratio of ethanol to water was 1:3), followed by addition of polyvinylpyrrolidone and ultrasonic dispersion to obtain a calcium carbonate particle solution (content of calcium carbonate was 2 wt%, content of polyvinylpyrrolidone was 0.1 wt%).
Linear polyethylene was mixed with dichloromethane to form a polyethylene dope (linear polyethylene concentration 10 wt%). Forming the polyethylene spinning solution into nascent fiber by adopting a flash evaporation method, forming the calcium carbonate particle solution into aerosol, spraying the aerosol on the surface of the nascent fiber, and forming the nascent fiber attached with the calcium carbonate particles in a cooling process.
The nascent fiber with attached calcium carbonate particles was deposited on a lapping transfer system to form a ribbon fiber (thickness 1.5 μm, width 15 μm) containing calcium carbonate particles. As shown in fig. 1, the ribbon fibers 1 are stacked one on another, and the particulate matter 2 is arranged in a staggered manner with the ribbon fibers 1, so that the ribbon fibers 1 are fluffy distributed in the thickness direction of the nonwoven fabric, thereby forming holes in the stacked cross section of the ribbon fibers 1.
Cleaning the ribbon fiber containing calcium carbonate particles in hydrochloric acid with the pH value of 1 to remove the calcium carbonate particles, then washing the residual hydrochloric acid by water, and drying at 80 ℃ to obtain the non-woven fabric. After the calcium carbonate particles are removed, partial holes are left and new holes are generated, and the hole diameter distribution of the holes is 0.1-2.5 mu m. The properties of the nonwoven fabric are shown in tables 4 and 5.
Fig. 2 is a schematic structural view of the nonwoven fabric of the present invention. The ribbon-type fibers 1 are stacked one on another, and the ribbon-type fibers 1 are distributed loosely in the thickness direction of the nonwoven fabric, so that holes are formed in the stacked cross section of the ribbon-type fibers 1, and these holes form the airflow passages 3.
Examples 2 to 4
In addition to calcium carbonate particles D90And the diameter of the holeThe distribution is shown in Table 1, and the rest of the parameters are the same as those in example 1. The properties of the nonwoven fabric are shown in tables 4 and 5.
TABLE 1
Examples 5 to 7
The parameters were the same as in example 1 except that the thickness and width of the ribbon fiber were as shown in table 2. The properties of the nonwoven fabric are shown in tables 4 and 5.
TABLE 2
| Numbering | Example 5 | Example 6 | Example 7 |
| Thickness (μm) | 1.7 | 1 | 1.2 |
| Width (mum) | 20 | 18 | 15 |
Examples 8 to 10
The parameters were the same as in example 1 except that the calcium carbonate content in the calcium carbonate particle solution was as shown in Table 3. The properties of the nonwoven fabric are shown in tables 4 and 5.
TABLE 3
| Numbering | Example 8 | Example 9 | Example 10 |
| Calcium carbonate content (wt%) | 1.5 | 1.0 | 0.5 |
Comparative example
Linear polyethylene was mixed with methylene chloride to form a polyethylene dope having a linear polyethylene concentration of 10 wt%. And forming the polyethylene spinning solution into nascent fibers by adopting a flash evaporation method, and depositing the nascent fibers on a lapping and transferring system to obtain the polyethylene non-woven fabric. The ribbon-type fibers in the polyethylene nonwoven fabric are stacked, and the thickness of the ribbon-type fibers is 2 μm and the width of the ribbon-type fibers is 9 μm. The properties of the polyethylene nonwoven fabric are shown in tables 4 and 5.
TABLE 4
TABLE 5
The present invention is not limited to the above-described embodiments, and any variations, modifications, and substitutions which may occur to those skilled in the art may be made without departing from the spirit of the invention.
Claims (10)
1. A nonwoven fabric characterized by comprising ribbon fibers stacked on each other, the ribbon fibers being distributed in a bulky manner in the thickness direction of the nonwoven fabric, and the nonwoven fabric having, in its cross section, an airflow channel formed by holes having a pore size distribution of 0.1 to 2.5 [ mu ] m.
2. The nonwoven fabric according to claim 1, wherein the thickness of the ribbon-type fibers is 0.2 to 3 μm and the width is 2 to 25 μm; and the ratio of width to thickness is greater than 2.
3. The nonwoven fabric of claim 1, wherein the nonwoven fabric has a grammage of 30 to 90g/m2。
4. The nonwoven fabric of claim 1, wherein the nonwoven fabric has a porosity of 68-80%.
5. The nonwoven fabric of claim 1, wherein the ribbon fiber is selected from one or more of polypropylene fiber, polyethylene fiber, and polyphenylene sulfide fiber.
6. A method for producing a nonwoven fabric according to any of claims 1 to 5, comprising the steps of:
(1) forming the spinning solution into nascent fiber;
(2) spraying a modifying solution containing particles and a surfactant on the nascent fiber to obtain a modified nascent fiber; d of the particulate matter900.1 to 3 μm;
(3) depositing the modified nascent fibers on a lapping transfer system to form a deposit containing particulate matter and ribbon fibers; the particles and the ribbon-type fibers are arranged in a staggered mode, so that the ribbon-type fibers are distributed in a fluffy mode in the thickness direction of the non-woven fabric, and a large number of holes are formed among the ribbon-type fibers due to the existence of the particles;
(4) and removing the particles in the sediment to obtain the non-woven fabric.
7. The production method according to claim 6, wherein in the step (2), the modifying solution is sprayed in the form of aerosol; the solvent of the modified solution is a mixed solution of ethanol and water, and the volume ratio of the ethanol to the water is 1-0.01: 100.
8. The method according to claim 6, wherein in the step (2), the particles are selected from one or more of titanium dioxide, silicon dioxide, aluminum oxide, silicate, carbonate, polymethyl methacrylate, polyvinylpyrrolidone, polystyrene, polyethylene glycol, polydimethylsiloxane, polylactic acid-glycolic acid copolymer, and chitosan; the content of the particulate matters in the modified solution is 0.1-20 wt%.
9. The production method according to claim 6, wherein in the step (2), the surfactant is one or more selected from polyvinylpyrrolidone, polyethylene oxide, sodium dodecylbenzenesulfonate, sodium hepatocholate, sodium stearyl sulfate, sodium stearate, and quaternary ammonium salts.
10. The production method according to any one of claims 6 to 9, wherein in the step (4), the deposit is washed with an aqueous solution of an inorganic acid to remove the particulate matter.
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| CN113417076A (en) * | 2021-06-23 | 2021-09-21 | 海南欣龙无纺股份有限公司 | Wormwood finishing melt-blown fabric and preparation method and application thereof |
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