CN106521811B - A kind of water filtering bi-component gradient-structure non-woven cloth and its preparation method and application - Google Patents

A kind of water filtering bi-component gradient-structure non-woven cloth and its preparation method and application Download PDF

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Publication number
CN106521811B
CN106521811B CN201611110671.9A CN201611110671A CN106521811B CN 106521811 B CN106521811 B CN 106521811B CN 201611110671 A CN201611110671 A CN 201611110671A CN 106521811 B CN106521811 B CN 106521811B
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fibre web
layer fibre
copet
filament fiber
layer
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CN106521811A (en
Inventor
王海平
王绪华
张书振
孙晓磊
张静
张泉城
朱绍存
杨会敏
李啟帆
褚菲菲
王敏
刘利防
路红
赵雪峰
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SHANDONG TAIPENG ENVIRONMENTAL PROTECTION MATERIAL Co Ltd
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SHANDONG TAIPENG ENVIRONMENTAL PROTECTION MATERIAL 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
    • D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
    • D04H3/005—Synthetic yarns or filaments
    • D04H3/009—Condensation or reaction polymers
    • D04H3/011—Polyesters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/14—Other self-supporting filtering material ; Other filtering material
    • B01D39/16—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres
    • B01D39/1607—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous
    • B01D39/1623—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous of synthetic origin
    • 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
    • D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
    • D04H3/018—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the shape
    • 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
    • D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
    • D04H3/08—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating
    • D04H3/14—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating with bonds between thermoplastic yarns or filaments produced by welding

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Filtering Materials (AREA)

Abstract

The invention discloses a kind of water filtering bi-component gradient-structure non-woven cloths and preparation method thereof, it is made of the first layer fibre web and second layer fibre web that are bonded together, wherein first layer fibre web and second layer fibre web are made of the trilobal PET filament fiber and circle COPET filament fiber of different fineness；The preparation method is that by sufficiently dry by pre-crystallized PET slice and COPET slice；Overstocked melting, spinning, cooling, drawing-off and sub-wire lapping are carried out by two groups of different filament spinning components, then is superimposed two layers of fibre web of gained to form composite web, most melts reinforcing through hot blast adhesion afterwards and is integrated；Water filtering bi-component gradient-structure non-woven cloth can give full play to the advantage of different fineness filtering inside filter material, it is ensured that filter efficiency effectively prolongs the service life, and in the reasonable scope by the control of pressure drop；Therefore non-woven cloth of the invention rolls the advantages of point, Air permenbility are big, filtering accuracy is high, and pressure drop is small, long service life with non-.

Description

A kind of water filtering bi-component gradient-structure non-woven cloth and its preparation method and application
Technical field
The present invention relates to Nonwovens In Technology field, specifically a kind of water filtering bi-component gradient-structure non-woven cloth And its preparation method and application.
Background technique
Terylene non-weaving cloth is made of polyester filament fiber hot melt adhesive, in adhesion process by itself it is fusible conjunction and It tangles, forms the three-dimensional micropore structure of random disordered arrangements in space, be mainly used as filtering material, which mainly passes through Effect between fiber between aperture and single fiber and particle, i.e., when liquid passes through, larger particles can be by interfibrous aperture blockage Deposition, smaller particle with liquid encounter fiber occur flow direction transformation, particle self gravity and liquid flow direction change under the action of, The surface for being adhered to fibrous material in turn by fiber capturing plays a role in filtering.
Current non-woven cloth multiselect terylene circular shaped filaments fiber, in filtering, most of particle is intercepted at filtering layer Surface, and surface void is easy to be filled and its internal voids is not utilized effectively, pressure during the filtration process It rises rapidly by force, prevent filter material is from playing one's part to the full, and service life is short.In addition, circular fibre structure determines Filter efficiency and pressure drop can not get both, and be in particular in: first, more fiber alignments, can make fiber in unit volume Between gap it is smaller, filter efficiency is higher, but the pressure drop inevitably rapid increase in filter process, reduces material Service life；Second, the slower of rising drops in pressure, shows that the hole of material internal is bigger, service life is longer, but unit area The fiber inside rearranged is also fewer, and filter efficiency is lower.And current nonwoven filter be mostly the terylene that has roll a little without Woven fabric, viscose fibre can be played the role of by rolling the fibers melt in a little, but the fiber after melting is completely plugged by duct, reduces The filter area of non-woven cloth filter material.Therefore, single terylene circular shaped filaments fiber filter effect and service life are limited, usually For in the lower filtering environment of filtering requirement.
Summary of the invention
To solve, existing terylene circular shaped filaments nonwoven filter structure is single, service life is short, pressure drop is big, filtering accuracy Low deficiency, the present invention provides a kind of water filtering bi-component gradient-structure non-woven cloths and its preparation method and application.
The present invention to achieve the above object, is achieved through the following technical solutions:
A kind of water filtering bi-component gradient-structure non-woven cloth, it is characterised in that: fine by the first layer being bonded together Net and second layer fibre web composition, wherein first layer fibre web and second layer fibre web by different fineness trilobal PET filament fiber It is formed with round COPET filament fiber；The line density of trilobal PET filament fiber is 2~6D, and the mass ratio for accounting for each layer fibre web is 70~95%, the line density of round COPET filament fiber is 1~4D.
Preferably, aperture is 10~200 μm, and grammes per square metre is 70~200g/m2, with a thickness of 0.3~1.6mm.
Preferably, it is 40~80% that first layer fibre web, which accounts for the weight ratio of water filtering bi-component gradient-structure non-woven cloth,.
Preferably, the line density of trilobal PET filament fiber is greater than trilobal PET in second layer fibre web in first layer fibre web The line density of filament fiber, the line density of circle COPET filament fiber is more than or equal to circle in second layer fibre web in first layer fibre web The line density of shape COPET filament fiber.
It is further preferred that being made of the first layer fibre web and second layer fibre web being bonded together, by what is be bonded together First layer fibre web and second layer fibre web composition, the trilobal PET filament fiber and line that wherein first layer fibre web is 3D by line density The round COPET filament fiber that density is 1.8D forms, and trilobal PET filament fiber accounts for first layer web quality 86%；The round COPET long filament that the trilobal PET filament fiber and line density that second layer fibre web is 2.5D by line density are 1.5D Fiber composition, and trilobal PET filament fiber accounts for the 83% of second layer web quality, and pore diameter range is 10~200 μm, grammes per square metre Range is 140g/m2, with a thickness of 0.55mm, first layer fibre web accounts for the weight ratio of water filtering bi-component gradient-structure non-woven cloth It is 75%.
The invention also includes the water filtering preparation methods of bi-component gradient-structure non-woven cloth, comprising the following steps:
1. PET and COPET is pre-crystallized, it is dry after slice, obtain PET slice and COPET slice；
2. by step 1. gained PET slice and COPET slice by first group of filament spinning component carry out melting overstocked, spinning, Cooling, traction and sub-wire lapping, obtain first layer fibre web；
3. by step 1. gained PET slice and COPET slice by second group of filament spinning component carry out melting overstocked, spinning, Cooling, traction and sub-wire lapping, obtain second layer fibre web；
4. by step 3. gained second layer fibre web be laid in step 2. gained first layer fibre web on, superposition obtain compound fibre Then composite web is obtained water filtering bi-component gradient-structure non-woven cloth by net after hot blast adhesion；Wherein hot blast temperature Between COPET and the fusing point of PET.
Preferably, the fusing point of PET slice is 260~265 DEG C, and the fusing point of COPET slice is 160~240 DEG C.
Preferably, the temperature of hot blast adhesion is 160~255 DEG C.
The invention also discloses the water filtering applications of bi-component gradient-structure non-woven cloth, fixed by coining, glued heat Tubular or flat liquid filter cartridge are made after type.
The present invention has the advantage that compared with prior art
Non-woven cloth of the invention is made of fineness different PET and COPET, and gradient is more, thickness is big；The non-woven cloth According to the characteristic of fiber, multiple structures fibrous layer different with aperture is combined, thicker and fluffy fiber can be in filter material Surface forms biggish aperture, and with absorbed portion bulky grain, and little particle can enter inside filter material, thinner inside filter material The aperture that fiber is formed in banking process is all smaller, can effectively filter molecule；And the larger thickness of material to filter Fiber inside material can sufficiently capture particle, and the design of gradient-structures more in this way can give full play to different inside filter material The advantage of fineness filtering, it is ensured that filter efficiency effectively prolongs the service life, and in the reasonable scope by the control of pressure drop；Therefore Non-woven cloth of the invention rolls the advantages of point, Air permenbility are big, filtering accuracy is high, and pressure drop is small, long service life with non-；
Non-woven cloth of the invention is blended using trefoil fiber and circular fiber progress, makes full use of trefoil fiber Polymorphic structure increases interfibrous contact area, creates more gaps compared with typical round fiber, it is non-to improve bi-component Woven porosity increases the probability collided between fiber and particle, to improve the filter capacity of non-woven cloth；
The aperture of first layer fibre web and second layer fibre web is defined, first layer by currently preferred non-woven cloth Fibre web is crude fibre, large aperture, and second layer fiber is that fine fibre, aperture pass through, and when use uses first layer fibre web for water entering surface, the Two layers of fibre web are the water surface, and so as to form the non-woven cloth of different gradient-structures, wherein the crude fibre of first layer fibre web is played Good structural support effect, biggish aperture trap partial size biggish particle while providing smaller resistance；And second The aperture of layer fibre web is smaller, secondary interception is carried out to the lesser particle of the partial size for flowing into non-woven cloth, so that entire non-woven cloth Turbidity removal rate be more than 95%；
Tack temperature is set in COPET and PET during hot blast adhesion by the preparation method of non-woven cloth of the invention Fusing point between, the selection of the temperature condition is so that low melting point COPET material molten plays cementation in viscosity flow state, and melts Generating state does not change the higher PET fiber of point, while guaranteeing fibre structure and crystallinity integrality, plays skeleton work With；And COPET fiber is evenly distributed in coarse-fibred inside, not only acts as adhesive effect, moreover it is possible to by original biggish hole It is subdivided into more small hole, to improve the filtering accuracy of non-woven cloth；And the preparation side of non-woven cloth of the invention Method can form equally distributed three-dimensional space network structure, which is conducive to liquid, gas passes through, and maintain preferable pressure Poor characteristic, to improve its service life.
Specific embodiment
The object of the present invention is to provide be achieved through the following technical solutions:
A kind of water filtering bi-component gradient-structure non-woven cloth, it is characterised in that: fine by the first layer being bonded together Net and second layer fibre web composition, wherein first layer fibre web and second layer fibre web by different fineness trilobal PET filament fiber It is formed with round COPET filament fiber；The line density of trilobal PET filament fiber is 2~6D, and the mass ratio for accounting for each layer fibre web is 70~95%, the line density of round COPET filament fiber is 1~4D.
Preferably, aperture is 10~200 μm, and grammes per square metre is 70~200g/m2, with a thickness of 0.3~1.6mm.
Preferably, it is 40~80% that first layer fibre web, which accounts for the weight ratio of water filtering bi-component gradient-structure non-woven cloth,.
Preferably, the line density of trilobal PET filament fiber is greater than trilobal PET in second layer fibre web in first layer fibre web The line density of filament fiber, the line density of circle COPET filament fiber is more than or equal to circle in second layer fibre web in first layer fibre web The line density of shape COPET filament fiber.
It is further preferred that being made of the first layer fibre web and second layer fibre web being bonded together, by what is be bonded together First layer fibre web and second layer fibre web composition, the trilobal PET filament fiber and line that wherein first layer fibre web is 3D by line density The round COPET filament fiber that density is 1.8D forms, and trilobal PET filament fiber accounts for first layer web quality 86%；The round COPET long filament that the trilobal PET filament fiber and line density that second layer fibre web is 2.5D by line density are 1.5D Fiber composition, and trilobal PET filament fiber accounts for the 83% of second layer web quality, and pore diameter range is 10~200 μm, grammes per square metre Range is 140g/m2, with a thickness of 0.55mm, first layer fibre web accounts for the weight ratio of water filtering bi-component gradient-structure non-woven cloth It is 75%.
The invention also includes the water filtering preparation methods of bi-component gradient-structure non-woven cloth, comprising the following steps:
1. PET and COPET is pre-crystallized, it is dry after slice, obtain PET slice and COPET slice；
2. by step 1. gained PET slice and COPET slice by first group of filament spinning component carry out melting overstocked, spinning, Cooling, traction and sub-wire lapping, obtain first layer fibre web；
3. by step 1. gained PET slice and COPET slice by second group of filament spinning component carry out melting overstocked, spinning, Cooling, traction and sub-wire lapping, obtain second layer fibre web；
4. by step 3. gained second layer fibre web be laid in step 2. gained first layer fibre web on, superposition obtain compound fibre Then composite web is obtained water filtering bi-component gradient-structure non-woven cloth by net after hot blast adhesion；Wherein hot blast temperature Between COPET and the fusing point of PET.
Preferably, the fusing point of PET slice is 260~265 DEG C, and the fusing point of COPET slice is 160~240 DEG C.
Preferably, the temperature of hot blast adhesion is 160~255 DEG C.
The invention also discloses the water filtering applications of bi-component gradient-structure non-woven cloth, fixed by coining, glued heat Tubular or flat liquid filter cartridge are made after type.
Below in conjunction with specific embodiment, the invention will be further described.
Embodiment 1
A kind of water filtering bi-component gradient-structure non-woven cloth, it is fine by the first layer fibre web and the second layer that are bonded together Net composition, the round COPET long that the trilobal PET filament fiber and line density that wherein first layer fibre web is 6D by line density are 4D Silk fiber composition, and trilobal PET filament fiber accounts for the 70% of first layer web quality；Second layer fibre web is 2D by line density Trilobal PET filament fiber and line density be 1D round COPET filament fiber form, and trilobal PET filament fiber Account for the 70% of second layer web quality.
Embodiment 2
A kind of water filtering bi-component gradient-structure non-woven cloth, it is fine by the first layer fibre web and the second layer that are bonded together Net composition, the round COPET long that the trilobal PET filament fiber and line density that wherein first layer fibre web is 6D by line density are 1D Silk fiber composition, and trilobal PET filament fiber accounts for the 95% of first layer web quality；Second layer fibre web is 6D by line density Trilobal PET filament fiber and line density be 4D round COPET filament fiber form, and trilobal PET filament fiber Account for the 95% of second layer web quality.
Embodiment 3
A kind of water filtering bi-component gradient-structure non-woven cloth, it is fine by the first layer fibre web and the second layer that are bonded together Net composition, the round COPET long that the trilobal PET filament fiber and line density that wherein first layer fibre web is 4D by line density are 1D Silk fiber composition, and trilobal PET filament fiber accounts for the 95% of first layer web quality；Second layer fibre web is 5D by line density Trilobal PET filament fiber and line density be 3D round COPET filament fiber form, and trilobal PET filament fiber Account for the 80% of second layer web quality.
Embodiment 4
A kind of water filtering bi-component gradient-structure non-woven cloth, it is fine by the first layer fibre web and the second layer that are bonded together Net composition, the round COPET long that the trilobal PET filament fiber and line density that wherein first layer fibre web is 6D by line density are 4D Silk fiber composition, and trilobal PET filament fiber accounts for the 70% of first layer web quality；Second layer fibre web is 2D by line density Trilobal PET filament fiber and line density be 1D round COPET filament fiber form, and trilobal PET filament fiber Account for the 70% of second layer web quality.
Embodiment 5
A kind of water filtering bi-component gradient-structure non-woven cloth, it is fine by the first layer fibre web and the second layer that are bonded together Net composition, the round COPET long that the trilobal PET filament fiber and line density that wherein first layer fibre web is 6D by line density are 4D Silk fiber composition, and trilobal PET filament fiber accounts for the 70% of first layer web quality；Second layer fibre web is 2D by line density Trilobal PET filament fiber and line density be 1D round COPET filament fiber form, and trilobal PET filament fiber The 70% of second layer web quality is accounted for, pore diameter range is 10~200 μm, the grammes per square metre scope 70g/m2, with a thickness of 0.3mm, first The weight ratio that layer fibre web accounts for water filtering bi-component gradient-structure non-woven cloth is 40%.
Embodiment 6
A kind of water filtering bi-component gradient-structure non-woven cloth, it is fine by the first layer fibre web and the second layer that are bonded together Net composition, the round COPET long that the trilobal PET filament fiber and line density that wherein first layer fibre web is 6D by line density are 1D Silk fiber composition, and trilobal PET filament fiber accounts for the 95% of first layer web quality；Second layer fibre web is 6D by line density Trilobal PET filament fiber and line density be 4D round COPET filament fiber form, and trilobal PET filament fiber The 95% of second layer web quality is accounted for, pore diameter range is 10~200 μm, the grammes per square metre scope 200g/m2, with a thickness of 1.6mm, first The weight ratio that layer fibre web accounts for water filtering bi-component gradient-structure non-woven cloth is 80%.
Embodiment 7
A kind of water filtering bi-component gradient-structure non-woven cloth, it is fine by the first layer fibre web and the second layer that are bonded together Net composition, the circle that the trilobal PET filament fiber and line density that wherein first layer fibre web is 3.5D by line density are 1.6D COPET filament fiber composition, and trilobal PET filament fiber accounts for the 82% of first layer web quality；Second layer fibre web is by line The round COPET filament fiber composition that the trilobal PET filament fiber and line density that density is 2.8D are 1.2D, and trilobal PET filament fiber accounts for the 75% of second layer web quality, and pore diameter range is 10~200 μm, the grammes per square metre scope 180g/m2, thickness For 0.75mm, the weight ratio that first layer fibre web accounts for water filtering bi-component gradient-structure non-woven cloth is 75%.
Embodiment 8
A kind of water filtering bi-component gradient-structure non-woven cloth, it is fine by the first layer fibre web and the second layer that are bonded together Net composition, the circle that the trilobal PET filament fiber and line density that wherein first layer fibre web is 3.5D by line density are 1.5D COPET filament fiber composition, and trilobal PET filament fiber accounts for the 80% of first layer web quality；Second layer fibre web is by line The round COPET filament fiber composition that the trilobal PET filament fiber and line density that density is 2.2D are 1.2D, and trilobal PET filament fiber accounts for the 85% of second layer web quality, and pore diameter range is 10~200 μm, the grammes per square metre scope 100g/m2, thickness For 0.23mm, the weight ratio that first layer fibre web accounts for water filtering bi-component gradient-structure non-woven cloth is 75%.
Embodiment 9
A kind of water filtering bi-component gradient-structure non-woven cloth,
It is made of the first layer fibre web and second layer fibre web that are bonded together, wherein first layer fibre web is 3D's by line density The round COPET filament fiber that trilobal PET filament fiber and line density are 1.8D forms, and trilobal PET filament fiber Account for the 86% of first layer web quality；The trilobal PET filament fiber and line density that second layer fibre web is 2.5D by line density be The round COPET filament fiber of 1.5D forms, and trilobal PET filament fiber accounts for the 83% of second layer web quality, aperture Range is 10~200 μm, the grammes per square metre scope 140g/m2, with a thickness of 0.55mm, first layer fibre web accounts for water filtering bi-component gradient The weight ratio of structure non-woven cloth is 75%.
Embodiment 10
The water filtering of embodiment 1 preparation method of bi-component gradient-structure non-woven cloth, comprising the following steps:
1. PET and COPET is pre-crystallized, it is dry after slice, obtain PET slice and COPET slice；
2. by step 1. gained PET slice and COPET slice by first group of filament spinning component carry out melting overstocked, spinning, Cooling, traction and sub-wire lapping, obtain first layer fibre web；
3. by step 1. gained PET slice and COPET slice by second group of filament spinning component carry out melting overstocked, spinning, Cooling, traction and sub-wire lapping, obtain second layer fibre web；
4. by step 3. gained second layer fibre web be laid in step 2. gained first layer fibre web on, superposition obtain compound fibre Then composite web is obtained water filtering bi-component gradient-structure non-woven cloth by net after hot blast adhesion；Wherein hot blast temperature It is 160 DEG C.
The water filtering of embodiment 2~9 preparation method reference implementation example 10 of bi-component gradient-structure non-woven cloth, hot wind Temperature is between COPET and the fusing point of PET.
Comparative example 1
It will be sufficiently dry by pre-crystallized PET slice；Then, by the melting of filament spinning component overstock, spinning, cooling, Drawing-off and sub-wire lapping, most through flower roll hot-rolling mill, hot pressing is obtained under the conditions of 220 DEG C/205 DEG C of temperature, line pressure 80N afterwards.Fiber It is PET circular shaped filaments fiber, line density 2D.The grammes per square metre of made one-component non-woven cloth is 140g/m2, with a thickness of 0.47mm.Water filtration filter element is made in the cutting of one pack system non-woven cloth, folding and sizing.
The water filtering of Examples 1 to 9 is detected with bi-component gradient-structure non-woven cloth, specific testing standard is thickness Degree test uses GB/T3820-1997 standard；Permeability test uses ASTM D737 standard；Ultimate strength and extension at break are adopted With 4595 testing standard of ASTMD；Filter element filtering performance test, with reference to GB/T18853-2002, carrier is water；Opening size test is adopted With platen press is steeped, performance indexes is as shown in table 1.
The testing result of the non-woven cloth of 1 Examples 1 to 9 of table
Embodiment 9 is compared with comparative example 1 it can be seen from the test result of table 1, is 140g/m2 condition in same grammes per square metre Under, bi-component gradient-structure non-woven cloth of the invention rolls the ultimate strength of a non-woven cloth than traditional PET circular shaped filaments and breaks Splitting elongation has large increase, and air penetrability is twice of conventional method non-woven cloth, and thickness is conventional method non-woven cloth By about one time, it means that under identical operating condition, bi-component gradient-structure non-woven cloth of the invention is guaranteeing big permeable amount While, water carrier flow and contact area are increased, that is, smaller, filter effect drops in pressure under same working environment Also more preferable, therefore the turbidity removal rate under equal conditions improves 30% compared with comparative example 1.
Bubble platen press opening size test shows that the minimum-value aperture of prepared 140g two-component non-woven cloth filter material in embodiment 9 is 19 μm, and aperture size is distributed in 19-101 μm, and most probable pore size is 58 μm, structure distribution, filters filter core for water in gradient It can be achieved to the multistage filtering of sizes particle, it can be achieved that filtration efficiency, the purpose of multistage filtering.Prepared by comparative example 1 The minimum-value aperture that PET circular shaped filaments roll a non-woven cloth is 26 μm, big compared with product in embodiment 1, and aperture size integrated distribution At 26 μm or so, maximum diameter of hole is only 51 μm, and aperture size span is non-woven much smaller than the more gradients of two-component prepared by embodiment 1 Cloth, the table that this traditional single structure filtering material can make most of particulate matter be intercepted at filtering layer during the filtration process Face, thus surface layer hole is easy to be filled and its internal voids, the pressure drop in filter process rise rapidly so that filter material without Method gives full play to the service life that effectiveness thereby reduces filter material.
Pressure drop the result shows that, embodiment 9 reach same pressure drop the time required to be the comparative example time three times it is more, I Can be inferred that the service life of two-component nonwoven filter prepared by embodiment 9 is that typical round long filament is non-in comparative example 1 The water filtering of 3 times for weaving filter material, the application has longer service life with bi-component gradient-structure non-woven cloth.

Claims (7)

1. a kind of water filtering bi-component gradient-structure non-woven cloth, it is characterised in that: by the first layer fibre web being bonded together Formed with second layer fibre web, wherein first layer fibre web and second layer fibre web by different fineness trilobal PET filament fiber and Round COPET filament fiber composition；The line density of trilobal PET filament fiber is 2~6D, and the mass ratio for accounting for each layer fibre web is 70 ~95%, the line density of round COPET filament fiber is 1~4D；It is non-that first layer fibre web accounts for water filtering bi-component gradient-structure The weight ratio of woven cloths is 40~80%；The line density of trilobal PET filament fiber is greater than second layer fibre web in first layer fibre web The line density of middle trilobal PET filament fiber, the line density of circle COPET filament fiber is more than or equal to second in first layer fibre web The line density of circle COPET filament fiber in layer fibre web.
2. water according to claim 1 filtering bi-component gradient-structure non-woven cloth, it is characterised in that: aperture is 10~ 200 μm, grammes per square metre is 70~200g/m2, with a thickness of 0.3~1.6mm.
3. water filtering bi-component gradient-structure non-woven cloth according to claim 1, it is characterised in that: by being bonded in one First layer fibre web and the second layer fibre web composition risen, is made of the first layer fibre web and second layer fibre web that are bonded together, wherein The round COPET filament fiber group that the trilobal PET filament fiber and line density that first layer fibre web is 3D by line density are 1.8D At, and trilobal PET filament fiber accounts for the 86% of first layer web quality；Three leaves that second layer fibre web is 2.5D by line density The round COPET filament fiber that shape PET filament fiber and line density are 1.5D forms, and trilobal PET filament fiber accounts for the The 83% of two layers of web quality, pore diameter range are 10~200 μm, the grammes per square metre scope 140g/m2, with a thickness of 0.55mm, first layer The weight ratio that fibre web accounts for water filtering bi-component gradient-structure non-woven cloth is 75%.
4. the preparation method that bi-component gradient-structure non-woven cloth is used in water filtering described in claim 1, it is characterised in that: including Following steps:
1. PET and COPET is pre-crystallized, it is dry after slice, obtain PET slice and COPET slice；
2. by step 1. gained PET slice and COPET slice by first group of filament spinning component carry out melting overstocked, spinning, cooling, Traction and sub-wire lapping, obtain first layer fibre web；
3. by step 1. gained PET slice and COPET slice by second group of filament spinning component carry out melting overstocked, spinning, cooling, Traction and sub-wire lapping, obtain second layer fibre web；
4. by step 3. gained second layer fibre web be laid in step 2. gained first layer fibre web on, superposition obtain composite web, so Composite web is obtained to water filtering bi-component gradient-structure non-woven cloth after hot blast adhesion afterwards；Wherein hot blast temperature exists Between COPET and the fusing point of PET.
5. the preparation method that bi-component gradient-structure non-woven cloth is used in water filtering according to claim 4, it is characterised in that: The fusing point of PET slice is 260~265 DEG C, and the fusing point of COPET slice is 160~240 DEG C.
6. the preparation method that bi-component gradient-structure non-woven cloth is used in water filtering according to claim 4, it is characterised in that: Step 4. in hot blast adhesion temperature be 160~255 DEG C.
7. the application that bi-component gradient-structure non-woven cloth is used in water filtering described in claim 1, it is characterised in that: through over-voltage Tubular or flat liquid filter cartridge is made after print, glued thermal finalization.
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