CN108893864B - Double-component melt-blown non-woven fabric and preparation process thereof - Google Patents

Double-component melt-blown non-woven fabric and preparation process thereof Download PDF

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CN108893864B
CN108893864B CN201810929055.9A CN201810929055A CN108893864B CN 108893864 B CN108893864 B CN 108893864B CN 201810929055 A CN201810929055 A CN 201810929055A CN 108893864 B CN108893864 B CN 108893864B
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melt
polylactic acid
polyester
bicomponent
blown
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CN108893864A (en
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章云
张贝尼
张娃妮
柯模松
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Zhang Yun
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Jixi Yuandao Agricultural Industrial Technology Co ltd
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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
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D13/00—Complete machines for producing artificial threads
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D5/00—Formation of filaments, threads, or the like
    • D01D5/28—Formation of filaments, threads, or the like while mixing different spinning solutions or melts during the spinning operation; Spinnerette packs therefor
    • D01D5/30—Conjugate filaments; Spinnerette packs therefor
    • 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
    • D04H1/4326—Condensation or reaction polymers
    • D04H1/435—Polyesters
    • 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
    • D04H1/4374—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 using different kinds of webs, e.g. by layering webs
    • 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
    • D04H1/541—Composite fibres, e.g. sheath-core, sea-island or side-by-side; Mixed 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
    • D04H1/54—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
    • D04H1/542—Adhesive fibres
    • D04H1/55—Polyesters
    • 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
    • D06M10/00—Physical treatment of fibres, threads, yarns, fabrics, or fibrous goods made from such materials, e.g. ultrasonic, corona discharge, irradiation, electric currents, or magnetic fields; Physical treatment combined with treatment with chemical compounds or elements
    • D06M10/02—Physical treatment of fibres, threads, yarns, fabrics, or fibrous goods made from such materials, e.g. ultrasonic, corona discharge, irradiation, electric currents, or magnetic fields; Physical treatment combined with treatment with chemical compounds or elements ultrasonic or sonic; Corona discharge
    • D06M10/025—Corona discharge or low temperature plasma
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2401/00—Physical properties
    • D10B2401/06—Load-responsive characteristics
    • D10B2401/061—Load-responsive characteristics elastic
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2401/00—Physical properties
    • D10B2401/06—Load-responsive characteristics
    • D10B2401/062—Load-responsive characteristics stiff, shape retention
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2401/00—Physical properties
    • D10B2401/06—Load-responsive characteristics
    • D10B2401/063—Load-responsive characteristics high strength
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2401/00—Physical properties
    • D10B2401/12—Physical properties biodegradable

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Chemical Or Physical Treatment Of Fibers (AREA)
  • Filtering Materials (AREA)
  • Nonwoven Fabrics (AREA)
  • Multicomponent Fibers (AREA)

Abstract

The invention discloses a bicomponent melt-blown non-woven fabric and a preparation process thereof, belonging to the processing field of non-woven fabrics, the invention firstly adopts a method of combining melt-blown spinning and electret treatment processes to prepare a lactic acid-polyester bicomponent fiber material, then adopts twice melt-blown spinning combined with steam bath stretching and hot rolling to prepare bicomponent melt-blown non-woven fabric, the steam bath stretching utilizes saturated steam to heat fibers, as water molecules can play a good plasticizing role, the fiber stretching stress is greatly reduced, the stretching multiple is improved, the prepared non-woven fabric thickness is favorably reduced, simultaneously the stretching is favorable for promoting the lamella crystal of molecular long chains and crystalline high polymers forming the fibers to be oriented along the axial direction of the fibers, the fiber stretching performance and the wear resistance are favorably improved, the hot rolling process is favorable for improving the glossiness and the adhesiveness of the fabrics, the melt-blown bicomponent non-woven fabric prepared by the invention has good temperature protection performance, and the hand feeling is soft.

Description

Double-component melt-blown non-woven fabric and preparation process thereof
Technical Field
The invention belongs to the technical field of non-woven fabrics, and particularly relates to a double-component melt-blown non-woven fabric and a preparation process thereof.
Background
Nonwoven materials are also known as nonwovens, non-woven fabrics, and the like. The non-woven technology is a new and emerging field of a novel multidisciplinary intersection, which is originated from the textile industry but surpasses the material processing technology of the textile industry. The non-woven technology combines four processing technologies of flexible materials such as paper making, textile, leather, plastics and the like, and the non-woven technology gradually becomes a necessary means for providing novel fiber structure materials. The technology is widely applied to the fields of environmental protection treatment, aerospace, medical care, agricultural technology and the like and the fields of daily life of people and the like. New nonwoven materials have become an increasingly popular and important product. The nonwoven industry is therefore also known as the sunrise industry in the textile industry. Melt-blown nonwoven technology has been rapidly developed due to its short processing and low production cost, and its products have applications in many fields with considerable market demand. The raw material used in the prior melt-blown non-woven technology is mainly polypropylene, which belongs to non-renewable resources and has poor biodegradability, and the single-component melt-blown material has single function and cannot meet the requirements of the current life production on the performance of non-woven fabrics.
Disclosure of Invention
According to the defects of the prior art, the technical problem to be solved by the invention is to provide the double-component melt-blown non-woven fabric and the preparation process thereof, wherein polyester fibers and polylactic acid fibers are selected as raw materials, and the defects of single function and poor biodegradability of the single-component melt-blown non-woven fabric in the prior art are overcome by controlling melt-blowing conditions and electret treatment process parameters.
In order to solve the technical problems, the invention adopts the technical scheme that:
a double-component melt-blown non-woven fabric comprises a polylactic acid fiber layer, a polylactic acid-polyester double-component fiber layer and a polyester fiber layer from top to bottom in sequence, wherein the polylactic acid-polyester double-component fiber layer is prepared by adopting a melt-blowing process and an electret treatment process, and the mass percentage of polylactic acid fibers is 85-95%.
A preparation process of a double-component melt-blown non-woven fabric comprises the following specific steps:
1) and (3) drying: drying the polylactic acid and the polyester chips by adopting a hot air drying process, wherein the drying parameters are as follows: the initial heating temperature of the temperature rise stage is 60-70 ℃, the temperature of the heat preservation stage is 110-; the temperature rising section heats the wet slices, pre-crystallization occurs, the softening point is improved, and the temperature preservation stage further removes the moisture in the slices and improves the crystallinity, thereby being beneficial to improving the softening point of the slices, preventing the slices from adhesion and simultaneously improving the drying rate;
2) and (3) melt-blowing process: respectively carrying out hot melting on the dried polylactic acid and polyester chips, filtering the melt, carrying out ultrasonic radiation treatment for 15-25min, and finally carrying out melt-blown spinning on the mixed melt and cooling to obtain a polylactic acid-polyester bicomponent fiber material;
3) an electret treatment process: placing a polylactic acid-polyester double-component fiber material on a polar plate of a corona device, and carrying out electret treatment process treatment, wherein the electret voltage is 12-15Kv, the electret time is 1-3s, and the electret distance is 45-60mm, and charged particles are adsorbed on the charged non-woven fabric due to the electrostatic action, so that the adhesion of subsequent melt-blown fibers is facilitated, and the cohesiveness of the non-woven fabric is improved;
4) compounding: and (3) taking the dried polylactic acid and polyester chips, respectively spinning polylactic acid and polyester on the upper surface and the lower surface of the polylactic acid-polyester bicomponent fiber material by adopting a melt-blown process, then carrying out steam bath stretching, and finally carrying out hot rolling and drying to obtain the bicomponent melt-blown non-woven fabric.
Preferably, the work density of the ultrasonic radiation is 100-150W/cm2The cavitation effect and the mechanical effect of the ultrasonic are more beneficial to the mixing of the polylactic acid and the polyester, and the fusion property and the orientation property of the two components are improved.
Preferably, the hot melt of polylactic acid: the temperature of the feeding section is 170-190 ℃, the temperature of the melting section is 200-220 ℃, and the temperature of the homogenizing section is 190-210 ℃; polyester hot melting: the temperature of the feeding section is 180-.
Preferably, the spinneret orifices of the melt-blown spinning are hyperbolic, the melt flow is 3-6mg/s, the air speed is 200-300m/s, the diameter of the spinneret orifices is 0.2-0.8mm, and the receiving distance is 20-30 cm.
Preferably, saturated steam is adopted for steam bath stretching, the stretching multiple is 4-7 times, the saturated steam is used for heating the fibers, water molecules can play a good plasticizing role, so that the tensile stress of the fibers is greatly reduced, the stretching multiple is improved, the thickness of the prepared non-woven fabric is favorably reduced, and meanwhile, the stretching is favorable for promoting the orientation of platelets of molecular long chains and crystalline high polymers forming the fibers along the axial direction of the fibers, so that the stretching performance and the wear resistance of the fibers are favorably improved.
Preferably, the rolling pressure of the hot rolling is 15-25Mpa, the temperature is 130-145 ℃, and the rolling speed is 5-8m/min, so that the glossiness and the adhesiveness of the cloth are improved.
Preferably, the thickness of the polylactic acid fiber layer is 0.5-1.5mm, the thickness of the polylactic acid-polyester bicomponent fiber layer is 3.5-6mm, and the thickness of the polyester fiber layer is 0.5-1.5 mm.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention adopts polylactic acid and polyester as raw materials, adopts a method of combining melt-blowing process and electret treatment to prepare the polylactic acid-polyester bicomponent fiber material, the polylactic acid has good biodegradability, physical characteristics similar to those of polyester fiber, high crystallinity and the same transparency, and has high heat resistance and high strength due to the high crystallinity and the high orientation degree, special equipment and operation process are not needed, spinning can be carried out by applying the conventional processing process, the polyester fiber has good wrinkle resistance and shape retention, higher strength and elastic recovery capability, the two are combined, the upper color difference of the polyester fiber is overcome, the strength of the polylactic acid fiber is improved, the melt-blowing process has good fiber web uniformity, soft hand feeling, simple process equipment, and electret treatment enables charged particles to be adsorbed on charged non-woven fabric, the adhesive is beneficial to the adhesion of the subsequent melt-blown fiber and improves the cohesiveness of the non-woven fabric.
2. The invention adopts a sectional type hot air drying process, the temperature rising section heats the wet sheet to generate pre-crystallization, the softening point is improved, the temperature preservation section further removes the moisture in the sheet and improves the crystallinity, the improvement of the softening point of the sheet is facilitated, the adhesion of the sheet is prevented, and the drying speed is improved.
3. The invention adopts three times of melt-blown spinning combined with steam bath drawing and hot rolling to prepare the double-component melt-blown non-woven fabric, saturated steam is utilized for heating the fibers in the steam bath drawing, water molecules can play a good plasticizing role, so that the tensile stress of the fibers is greatly reduced, the drawing multiple is improved, the thickness of the prepared non-woven fabric is favorably reduced, meanwhile, the drawing is favorable for promoting the orientation of molecular long chains and crystalline high polymer platelets forming the fibers along the axial direction of the fibers, the drawing performance and the wear resistance of the fibers are favorably improved, and the hot rolling process is favorable for improving the glossiness and the adhesiveness of the fabric.
Drawings
1. FIG. 1 is a schematic view of the structure of the bicomponent meltblown nonwoven fabric of this example.
1. The double-component melt-blown non-woven fabric comprises a double-component melt-blown non-woven fabric layer 11, a polylactic acid fiber layer 12, a polylactic acid-polyester double-component fiber layer 13 and a polyester fiber layer.
Detailed Description
The present invention is further described in detail in the following description of embodiments thereof, so as to help those skilled in the art to more fully, accurately and deeply understand the inventive concept and technical solutions of the present invention.
Example 1
A double-component melt-blown non-woven fabric 1 comprises a 1mm polylactic acid fiber layer 11, a 4mm polylactic acid-polyester double-component fiber layer 12 and a 1mm polyester fiber layer 13 from top to bottom in sequence, wherein the polylactic acid-polyester double-component fiber layer is prepared by a melt-blown process and an electret treatment process, and the mass percentage of polylactic acid fibers is 90%.
A preparation process of a double-component melt-blown non-woven fabric comprises the following specific steps:
1) and (3) drying: drying the polylactic acid and the polyester chips by adopting a hot air drying process, wherein the drying parameters are as follows: the initial heating temperature of the heating stage is 65 ℃, when the temperature reaches 65 ℃, the slices are put into the heating stage, the heating rate is 4 ℃/min, then the temperature is continuously increased to 130 ℃, the vacuum degree is kept at 1.5Mpa, and the heat preservation time is 20 min; the temperature rising section heats the wet slices, pre-crystallization occurs, the softening point is improved, and the temperature preservation stage further removes the moisture in the slices and improves the crystallinity, thereby being beneficial to improving the softening point of the slices, preventing the slices from adhesion and simultaneously improving the drying rate;
2) and (3) melt-blowing process: respectively carrying out hot melting on the dried polylactic acid and the dried polyester slices, wherein the hot melting of the polylactic acid is as follows: the temperature of the feeding section is 180 ℃, the temperature of the melting section is 210 ℃, and the temperature of the homogenizing section is 200 ℃; polyester hot melting: the temperature of a feeding section is 190 ℃, the temperature of a melting section is 260 ℃, the temperature of a homogenizing section is 225 ℃, barrier-shaped screws are adopted as the screws, the length-diameter ratio of the screws is 24, then melts are respectively filtered by a 150-mesh screen, ultrasonic radiation with the power density of 150W/L is adopted for treating for 20min, the ultrasonic cavitation effect and the mechanical effect are more beneficial to mixing polylactic acid and polyester, the fusion property and the orientation of two components are improved, finally the mixed melts are subjected to melt-blown spinning, the spinneret orifice of the melt-blown spinning is hyperbolic, the melt flow is 4mg/s, the air speed is 250m/s, the diameter of the orifice is 0.65mm, the receiving distance is 25cm, and the polylactic acid-polyester two-component fiber material is obtained after cooling;
3) an electret treatment process: placing a polylactic acid-polyester double-component fiber material on a polar plate of an external corona device, aligning an upper polar plate and a lower polar plate which are provided with a multi-needle electrode, then spreading the polylactic acid-polyester double-component fiber material on the lower polar plate, opening a high-voltage electrostatic generator, generating local corona discharge by air near the needle point of the electrode, enabling a sample to carry charges to carry out electret treatment process treatment, wherein the electret voltage is 13Kv, the electret time is 2s, and the electret distance is 55 mm;
4) compounding: taking dried polylactic acid and polyester chips, respectively spinning polylactic acid and polyester on the upper and lower surfaces of a polylactic acid-polyester bicomponent fiber material by adopting a melt-blowing process, then carrying out steam bath stretching, finally carrying out hot rolling, wherein the rolling pressure of the hot rolling is 20Mpa, the temperature is 140 ℃, the rolling speed is 7m/min, the gloss and the adhesiveness of the cloth are favorably improved, drying is carried out, the two-component melt-blown non-woven fabric is obtained, saturated steam is adopted for steam bath stretching, the stretching multiple is 5 times, the saturated steam is used for heating the fiber, because the water molecules can play a good plasticizing role, the tensile stress of the fiber is greatly reduced, the stretching multiple is improved, the thickness of the prepared non-woven fabric is favorably reduced, meanwhile, the drawing is favorable for promoting the molecular long chains forming the fibers and the lamella crystal of the crystalline high polymer to be oriented along the axial direction of the fibers, and is favorable for improving the drawing performance and the wear resistance of the fibers.
Example 2
This example is the same as example 1, except that the polylactic acid is hot-melted in the hot-melting in this example: the temperature of the feeding section is 170 ℃, the temperature of the melting section is 200 ℃, and the temperature of the homogenizing section is 190 ℃; polyester hot melting: the temperature of the feeding section is 180 ℃, the melting section is 257 ℃, the homogenizing section is 220 ℃, and the length-diameter ratio of the screw is 23.
Example 3
This example is the same as example 1 except that the melt flow rate in this example was 4mg/s, the air velocity was 200m/s, the orifice diameter was 0.2mm, and the take-up distance was 20 cm.
Example 4
This example is the same as example 1 except that the melt flow rate in this example was 6mg/s, the air velocity was 300m/s, the orifice diameter was 0.8mm, and the take-up distance was 30 cm.
Example 5
This example is the same as example 2 except that the melt flow rate in this example was 4mg/s, the air velocity was 200m/s, the orifice diameter was 0.2mm, and the take-up distance was 20 cm.
Example 6
This example is the same as example 2 except that the melt flow rate in this example was 6mg/s, the air velocity was 300m/s, the orifice diameter was 0.8mm, and the take-up distance was 30 cm.
The invention has been described in an illustrative manner, and it is to be understood that the invention is not limited to the precise form disclosed, and that various insubstantial modifications of the inventive concepts and solutions, or their direct application to other applications without such modifications, are intended to be covered by the scope of the invention. The protection scope of the present invention shall be subject to the protection scope defined by the claims.

Claims (7)

1. A double-component melt-blown non-woven fabric is characterized by comprising a polylactic acid fiber layer, a polylactic acid-polyester double-component fiber layer and a polyester fiber layer from top to bottom in sequence, wherein the polylactic acid-polyester double-component fiber layer is prepared by a melt-blowing process and an electret treatment process, and the mass percentage of polylactic acid fibers is 85-95%; the preparation process of the bicomponent melt-blown non-woven fabric comprises the following specific steps:
(1) and (3) drying: drying the polylactic acid and the polyester chips by adopting a hot air drying process, wherein the drying parameters are as follows: the initial heating temperature of the temperature rise stage is 60-70 ℃, the temperature of the heat preservation stage is 110-;
(2) and (3) melt-blowing process: respectively carrying out hot melting on the dried polylactic acid and polyester chips, filtering the melt, carrying out ultrasonic radiation treatment for 15-25min, and finally carrying out melt-blown spinning on the mixed melt and cooling to obtain a polylactic acid-polyester bicomponent fiber material;
(3) an electret treatment process: placing polylactic acid-polyester double-component fiber material on a polar plate of a corona device, and carrying out electret treatment process treatment, wherein the electret voltage is 12-15Kv, the electret time is 1-3s, and the electret distance is 45-60 mm;
(4) compounding: and (3) taking the dried polylactic acid and polyester chips, respectively spinning the polylactic acid and the polyester on the upper surface and the lower surface of the polylactic acid-polyester bicomponent fiber material by adopting a melt-blown process, then carrying out steam bath stretching, and finally carrying out hot rolling and drying to obtain the bicomponent melt-blown non-woven fabric.
2. The bicomponent meltblown nonwoven fabric according to claim 1, wherein the work density of the ultrasonic radiation is 100-150W/cm2。
3. The bicomponent melt-blown nonwoven fabric according to claim 1, wherein the hot melt of polylactic acid: the temperature of the feeding section is 170-190 ℃, the temperature of the melting section is 200-220 ℃, and the temperature of the homogenizing section is 190-210 ℃; polyester hot melting: the temperature of the feeding section is 180-.
4. The bicomponent meltblown nonwoven according to claim 1, wherein the spinneret holes of the meltblown filaments are hyperbolic, the melt flow is 3-6mg/s, the air velocity is 200-300m/s, the diameter of the spinneret holes is 0.2-0.8mm, and the receiving distance is 20-30 cm.
5. The bicomponent meltblown nonwoven according to claim 1, characterized in that the steam bath stretching uses saturated steam with a stretching ratio of 4 to 7.
6. The bicomponent melt-blown nonwoven fabric according to claim 1, wherein the hot rolling is carried out at a roll pressure of 15-25Mpa, a temperature of 130-145 ℃ and a roll speed of 5-8 m/min.
7. The bicomponent melt-blown nonwoven fabric according to claim 1, wherein the thickness of the polylactic acid fiber layer is 0.5-1.5mm, the thickness of the polylactic acid-polyester bicomponent fiber layer is 3.5-6mm, and the thickness of the polyester fiber layer is 0.5-1.5 mm.
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