CN108654209B - Spun-bonded base fabric spunlace filter material and preparation method thereof - Google Patents

Spun-bonded base fabric spunlace filter material and preparation method thereof Download PDF

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CN108654209B
CN108654209B CN201810372727.0A CN201810372727A CN108654209B CN 108654209 B CN108654209 B CN 108654209B CN 201810372727 A CN201810372727 A CN 201810372727A CN 108654209 B CN108654209 B CN 108654209B
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layer
base fabric
spun
filter material
spunlace
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CN108654209A (en
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何丽芬
刘建祥
于淼涵
夏前军
陈祥
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Nanjing Jihua 3521 Environmental Protection Technology Co ltd
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Nanjing Jihua 3521 Environmental Protection Technology Co ltd
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    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/12—Layered products comprising a layer of synthetic resin next to a fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/06—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the heating method
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B32B5/022—Non-woven fabric
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/10—Filtering material manufacturing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/20—All layers being fibrous or filamentary
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/02—Synthetic macromolecular fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/02—Synthetic macromolecular fibres
    • B32B2262/0276—Polyester fibres

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Filtering Materials (AREA)
  • Nonwoven Fabrics (AREA)

Abstract

The invention discloses a spun-bonded base fabric spunlace filter material and a preparation method thereof, belonging to the technical field of filter materials and sequentially comprising an upper layer non-woven fabric, a first bonding layer, a spun-bonded base fabric layer, a second bonding layer and a lower layer non-woven fabric from outside to inside, wherein the spun-bonded base fabric layer is made of the following fiber materials: the adhesive layer is made up by using polyester fibre or polyphenyl thioether fibre, adopting size point method to make upper and lower layers of non-woven fabric and spunbonded base fabric layer be bonded together, and adopting size point method to make the hot-melt adhesive powder material and base pulp adjuvant be prepared into the pulp with a certain viscosity, then adopting size point coating machine to make the pulp be applied on the non-woven fabric in the form of point, then adopting high-temp. and solidifying so as to obtain the invented product, and the size point coating formula adopting size point coating machine is: water, emulsifier, polyethylene hot melt adhesive and thickener. The filter material of the invention has better uniformity, smoother surface, higher strength and higher filtering precision.

Description

Spun-bonded base fabric spunlace filter material and preparation method thereof
Technical Field
The invention relates to a filter material and a preparation method thereof, in particular to a spun-bonded base fabric spunlace filter material and a preparation method thereof, and belongs to the technical field of filter materials.
Background
The traditional filter material needs to increase the strength of the filter material by adding a layer of woven fabric as base fabric between an upper layer of fiber web and a lower layer of fiber web, but the woven fabric is weak in participating in the filtering capacity and hardly has influence on the filtering precision of the filter material. Therefore, the filter material of the invention replaces the original woven base cloth with the spun-bonded base cloth, the base cloth prepared by the spun-bonded method is a filament non-woven layer, and the fibers are thinner, so the filter precision of the filter material can be obviously improved by adding the spun-bonded base cloth.
In addition, the production cost of enterprises is considered, and under the condition that the filtering precision of the filtering material is met, the addition of the spun-bonded base fabric can reduce the fiber consumption of the upper non-woven layer and the lower non-woven layer, so that the cost is saved.
However, in the processing process, the base fabric is compact in structure, so that the upper and lower layers of non-woven fabrics are difficult to be well hooked together when being reinforced by a needling and spunlace process, and the bonding property between the base fabric and the upper and lower layers of non-woven fabrics is poor, so that the layering of the filter material is easily caused, and the service life of the filter material is influenced.
In order to overcome the defects, polypropylene resin powder is added on the front side and the back side of the spun-bonded base fabric, the upper non-woven fabric layer and the lower non-woven fabric layer are tightly bonded together in a high-temperature hot melting mode, and in addition, the surface of the filter material is more compact and smooth by being matched with spunlace reinforcement, so that the filter material has higher strength and filter precision.
Disclosure of Invention
The invention mainly aims to provide a spun-bonded base fabric spunlace filter material and a preparation method thereof, and the filter material has better uniformity, smoother surface, higher strength and higher filtering precision.
The purpose of the invention can be achieved by adopting the following technical scheme:
the utility model provides a spunbonded base fabric spunlace filter material, includes upper non-woven fabrics, first bond line, spunbonded base fabric layer, second bond line and lower floor's non-woven fabrics in proper order from outer to inner, first bond line sets up upper non-woven fabrics with spunbonded between the base fabric layer, spunbonded base fabric layer sets up first bond line with between the second bond line, the second bond line sets up spunbonded base fabric layer with between the non-woven fabrics of lower floor.
Further, the fiber material of the spunbonded base fabric layer is as follows: polyester fibers or polyphenylene sulfide fibers.
Furthermore, the first adhesive layer and the second adhesive layer respectively bond the upper non-woven fabric layer and the lower non-woven fabric layer with the spunbonded base fabric layer by adopting a slurry dot method.
Furthermore, the paste dotting method is that firstly the hot melt adhesive powder and the bottom paste auxiliary agent are prepared into paste with certain viscosity, then a paste dotting coating machine is adopted to apply the paste to the non-woven fabric in a dotted manner, and then the non-woven fabric is formed through high temperature and solidification.
Further, the slurry point coating formula adopting the slurry point coating machine is as follows: water, emulsifier, polyethylene hot melt adhesive and thickener.
Further, the fiber material of upper non-woven fabrics with the non-woven fabrics of lower floor is: polyester fibers or polyphenylene sulfide fibers.
A preparation method of spun-bonded base fabric spunlace filter materials comprises the following steps:
step 1: polyester fiber or polyphenylene sulfide fiber is subjected to opening, mixing, carding, lapping and grid connection, then added into the spunbonded base fabric, slurry is respectively sprayed between the upper non-woven fabric layer and the spunbonded base fabric layer and between the lower non-woven fabric layer and the spunbonded base fabric layer by a slurry point method, then the outer layer of the fiber web layer is pressurized by a hot melting bonder under certain temperature, pressure and time, and after the slurry is cooled, the slurry is solidified, so that the upper non-woven fabric layer and the lower non-woven fabric layer are bonded together, wherein the pressurizing temperature is 110-;
step 2: putting the fiber web layer prepared in the step 1 into a pre-needling machine for pre-needling, wherein the pre-needling density is 60-100 punches/cm2；
And step 3: carrying out spunlace reinforcement on the pre-needled felt treated in the step 2, and directly drying and heat-setting the pre-needled felt in an oven at the temperature of 150-200 ℃ to obtain a spunlace felt filter material, wherein the spunlace speed is 3-10m/min, and the spunlace pressure is 200-380 bar;
and 4, step 4: and (4) drying and heat setting the spunlace felt filter material obtained in the step (3) to finally obtain the spunlace base fabric filter material.
Further, the preparation method of the spunbonded base fabric comprises the following steps: the spun-bonded base fabric is prepared by taking thermoplastic materials of polyester and polyphenylene sulfide as raw materials and performing melt spinning on a high molecular polymer to form a net, wherein the prepared spun-bonded base fabric fiber material is a filament, and the fineness of the fiber is high<1dtex, the gram weight of the prepared spunbonded base fabric is 100-150g/m2。
The invention has the beneficial technical effects that: according to the spun-bonded base fabric spunlace filter material and the preparation method thereof, the spun-bonded base fabric spunlace filter material and the preparation method thereof provided by the invention have the advantages that the original woven base fabric is replaced by the spun-bonded base fabric, the base fabric prepared by the spun-bonded method is a filament non-woven layer, the fibers are finer, the filtering precision and strength of the filter material can be obviously improved, in addition, the common filter material is often influenced to use due to the fact that the warp strength does not reach the standard, and the warp strength of the spun-bonded base fabric is greater than the weft strength, so that the filter material can be reinforced. In addition, the pore diameter among fibers in the filter material can be reduced by adopting the spunlace reinforcement, the surface of the filter material is more compact and smooth, the strength is high, the filtering precision is high, and the method is suitable for dust removal working conditions with fine dust particle size and high emission requirements.
Drawings
Figure 1 is a cross-sectional view of a preferred embodiment of a spunbond base web spunlace filter material according to the invention.
In the figure: 1-upper non-woven fabric, 2-first adhesive layer, 3-spun-bonded base fabric layer, 4-second adhesive layer and 5-lower non-woven fabric.
Detailed Description
In order to make the technical solutions of the present invention more clear and definite for those skilled in the art, the present invention is further described in detail below with reference to the examples and the accompanying drawings, but the embodiments of the present invention are not limited thereto.
Example 1:
as shown in fig. 1, the spun-bonded base fabric spunlace filter material provided in this embodiment 1 is characterized by sequentially comprising an upper layer of non-woven fabric 1, a first adhesive layer 2, a spun-bonded base fabric layer 3, a second adhesive layer 4 and a lower layer of non-woven fabric 5 from outside to inside, wherein the first adhesive layer 2 is disposed between the upper layer of non-woven fabric 1 and the spun-bonded base fabric layer 3, the spun-bonded base fabric layer 3 is disposed between the first adhesive layer 2 and the second adhesive layer 4, and the second adhesive layer 4 is disposed between the spun-bonded base fabric layer 3 and the lower layer of non-woven fabric 5.
In this example 1, as shown in fig. 1, the fiber material of the spunbond base layer 3 is: polyester fibers or polyphenylene sulfide fibers; the first adhesive layer 2 and the second adhesive layer 4 are used for respectively bonding the upper non-woven fabric 1 and the lower non-woven fabric 5 with the spun-bonded base fabric layer 3 by adopting a slurry point method; the paste point method is that firstly, the hot melt adhesive powder and the bottom paste auxiliary agent are prepared into paste with certain viscosity, then a paste point coating machine is adopted to apply the paste to the non-woven fabric in a point manner, and then the non-woven fabric is formed by high temperature and solidification; the slurry point coating formula adopting the slurry point coating machine is as follows: water, emulsifier, polyethylene hot melt adhesive and thickener.
In this embodiment 1, the preparation method of the spun-bonded base fabric spunlace filter material provided in this embodiment 1 replaces the base fabric added in the non-woven layer with the spun-bonded base fabric from the conventional woven fabric, and includes the following steps:
(1) preparation of spunbonded base fabric: polyester is used as a raw material, a high molecular polymer is heated and melted, and is uniformly distributed to each spinning position through a melt pipeline, a filter, a spinning pump and the like. And then the fiber is sprayed out from a spinneret orifice, the filament tows are uniformly laid on a condensing net curtain after being cooled and drafted by airflow, and the formed filament fiber net is subjected to low-temperature pressureless hot rolling to prepare the fiber net material by the spunbond method. The spun-bonded base fabric is a filament non-woven layer, the fineness of the fiber is 1dtex, and the gram weight is 130g/m2；
(2) Preparing a spun-bonded base fabric spunlace filter material:
step 1: polyester fibers are subjected to opening, mixing, carding, lapping and grid connection and then added into a spunbonded base fabric, slurry is respectively sprayed between an upper layer of non-woven fabric and the spunbonded base fabric and between a lower layer of non-woven fabric and the spunbonded base fabric by a slurry point method, then the outer layer of the fiber web is pressurized by a hot melting bonder under certain temperature, pressure and time, and the slurry is solidified after being cooled, so that the upper and lower layers of non-woven fabrics and the spunbonded base fabric are bonded together, wherein the pressurizing temperature is 110 ℃, the pressure is 80N/cm, and the time is 1 min;
step 2: putting the fiber web layer prepared in the step 1 into a pre-needling machine for pre-needling, wherein the pre-needling density is 60 spines/cm2；
And step 3: carrying out spunlace reinforcement on the pre-needled felt treated in the step 2, and then directly drying and heat setting the pre-needled felt in an oven at the temperature of 150 ℃ to obtain a spunlace felt filter material, wherein the spunlace speed is 5m/min, and the spunlace pressure is 200 bar;
and 4, step 4: and (4) drying and heat setting the spunlace felt filter material obtained in the step (3) to finally obtain the spunlace base fabric filter material.
In this embodiment 1, the comparison of the performances of the spun-bonded base fabric spunlace filter material and the ordinary needle-punched filter material is shown in table 1, and through the comparison, it can be found that the warp and weft strength and the filtering accuracy of the spun-bonded base fabric spunlace filter material are superior to those of the conventional woven base fabric needle-punched filter material under the condition of the same gram weight.
TABLE 1 comparison of the Performance of polyester spun-bonded base cloth spunlace filter materials and polyester ordinary needled filter materials
Figure BDA0001638769920000051
Example 2:
as shown in fig. 1, the spun-bonded base fabric spunlace filter material provided in this embodiment 2 is characterized by sequentially comprising an upper layer of non-woven fabric 1, a first adhesive layer 2, a spun-bonded base fabric layer 3, a second adhesive layer 4 and a lower layer of non-woven fabric 5 from outside to inside, wherein the first adhesive layer 2 is disposed between the upper layer of non-woven fabric 1 and the spun-bonded base fabric layer 3, the spun-bonded base fabric layer 3 is disposed between the first adhesive layer 2 and the second adhesive layer 4, and the second adhesive layer 4 is disposed between the spun-bonded base fabric layer 3 and the lower layer of non-woven fabric 5.
In this example 2, as shown in fig. 1, the fiber material of the spunbond base layer 3 is: polyester fibers or polyphenylene sulfide fibers; the first adhesive layer 2 and the second adhesive layer 4 are used for respectively bonding the upper non-woven fabric 1 and the lower non-woven fabric 5 with the spun-bonded base fabric layer 3 by adopting a slurry point method; the paste point method is that firstly, the hot melt adhesive powder and the bottom paste auxiliary agent are prepared into paste with certain viscosity, then a paste point coating machine is adopted to apply the paste to the non-woven fabric in a point manner, and then the non-woven fabric is formed by high temperature and solidification; the slurry point coating formula adopting the slurry point coating machine is as follows: water, emulsifier, polyethylene hot melt adhesive and thickener.
In this embodiment 2, in the spun-bonded base fabric spunlace filter material and the preparation method thereof provided in this embodiment 2, the base fabric added in the non-woven layer is replaced by the spun-bonded base fabric from the conventional woven fabric, which includes the following steps:
(1) preparation of spunbonded base fabric: polyester is used as a raw material, a high molecular polymer is heated and melted, and is uniformly distributed to each spinning position through a melt pipeline, a filter, a spinning pump and the like. And then the fiber is sprayed out from a spinneret orifice, the filament tows are uniformly laid on a condensing net curtain after being cooled and drafted by airflow, and the formed filament fiber net is subjected to low-temperature pressureless hot rolling to prepare the fiber net material by the spunbond method. The spun-bonded base fabric is a filament non-woven layer, the fineness of the fiber is 1dtex, and the gram weight is 130g/m2；
(2) Preparing a spun-bonded base fabric spunlace filter material:
step 1: polyester fibers are subjected to opening, mixing, carding, lapping and grid connection and then added into a spunbonded base fabric, slurry is respectively sprayed between an upper layer of non-woven fabric and the spunbonded base fabric and between a lower layer of non-woven fabric and the spunbonded base fabric by a slurry point method, then the outer layer of the fiber web is pressurized by a hot melting bonder under certain temperature, pressure and time, and the slurry is solidified after being cooled, so that the upper and lower layers of non-woven fabrics and the spunbonded base fabric are bonded together, wherein the pressurizing temperature is 110 ℃, the pressure is 100N/cm, and the time is 2 min;
step 2: putting the fiber web layer prepared in the step 1 into a pre-needling machine for pre-needling, wherein the pre-needling density is 80 punches/cm2；
And step 3: carrying out spunlace reinforcement on the pre-needled felt treated in the step 2, and then directly drying and heat setting the pre-needled felt in an oven at the temperature of 150 ℃ to obtain a spunlace felt filter material, wherein the spunlace speed is 8m/min, and the spunlace pressure is 300 bar;
and 4, step 4: and (4) drying and heat setting the spunlace felt filter material obtained in the step (3) to finally obtain the spunlace base fabric filter material.
In this embodiment 2, the comparison of the performances of the polyester spun-bonded base fabric spunlace filter material and the polyester ordinary needled filter material is shown in table 2, and through the comparison, it can be found that, under the condition of the same gram weight, the warp and weft strength and the filtration precision of the polyester spun-bonded base fabric spunlace filter material are superior to those of the polyester ordinary woven base fabric needled filter material, and the filtration precision can reach 99.998%.
TABLE 2 comparison of the Performance of polyester spun-bonded base cloth spunlace filter material and polyester ordinary needled filter material
Figure BDA0001638769920000071
Example 3:
as shown in fig. 1, the spun-bonded base fabric spunlace filter material provided in this embodiment 3 is characterized by sequentially comprising an upper layer of non-woven fabric 1, a first adhesive layer 2, a spun-bonded base fabric layer 3, a second adhesive layer 4 and a lower layer of non-woven fabric 5 from outside to inside, wherein the first adhesive layer 2 is disposed between the upper layer of non-woven fabric 1 and the spun-bonded base fabric layer 3, the spun-bonded base fabric layer 3 is disposed between the first adhesive layer 2 and the second adhesive layer 4, and the second adhesive layer 4 is disposed between the spun-bonded base fabric layer 3 and the lower layer of non-woven fabric 5.
In this example 3, as shown in fig. 1, the fiber material of the spunbond base layer 3 is: polyester fibers or polyphenylene sulfide fibers; the first adhesive layer 2 and the second adhesive layer 4 are used for respectively bonding the upper non-woven fabric 1 and the lower non-woven fabric 5 with the spun-bonded base fabric layer 3 by adopting a slurry point method; the paste point method is that firstly, the hot melt adhesive powder and the bottom paste auxiliary agent are prepared into paste with certain viscosity, then a paste point coating machine is adopted to apply the paste to the non-woven fabric in a point manner, and then the non-woven fabric is formed by high temperature and solidification; the slurry point coating formula adopting the slurry point coating machine is as follows: water, emulsifier, polyethylene hot melt adhesive and thickener.
In this embodiment 3, in the spun-bonded base fabric spunlace filter material and the preparation method thereof provided in this embodiment 3, the base fabric added in the non-woven layer is replaced by the spun-bonded base fabric from the conventional woven fabric, which includes the following steps:
(1) preparation of spunbonded base fabric: polyphenylene sulfide is used as a raw material, a high molecular polymer is heated and melted, and is uniformly distributed to each spinning position through a melt pipeline, a filter, a spinning pump and the like. And then the fiber is sprayed out from a spinneret orifice, the filament tows are uniformly laid on a condensing net curtain after being cooled and drafted by airflow, and the formed filament fiber net is subjected to low-temperature pressureless hot rolling to prepare the fiber net material by the spunbond method. The spun-bonded base fabric is a filament non-woven layer, the fineness of the fiber is 1dtex, and the gram weight is 150g/m2；
(2) Preparing a spun-bonded base fabric spunlace filter material:
step 1: the method comprises the steps of opening, mixing, carding, lapping and grid-connection of polyphenylene sulfide fibers, adding the polyphenylene sulfide fibers into a spunbonded base fabric, spraying slurry between an upper layer of non-woven fabric and the spunbonded base fabric and between a lower layer of non-woven fabric and the spunbonded base fabric respectively by a slurry point method, pressurizing the outer layer of a fiber web layer by a hot-melt bonder at certain temperature, pressure and time, cooling the slurry, and solidifying to bond the upper and lower layers of non-woven fabrics and the spunbonded base fabric together, wherein the pressurizing temperature is 120 ℃, the pressure is 150N/cm, and the time is 3 min;
step 2: putting the fiber web layer prepared in the step 1 into a pre-needling machine for pre-needling, wherein the pre-needling density is 100 spines/cm2；
And step 3: carrying out spunlace reinforcement on the pre-needled felt treated in the step 2, and then directly drying and heat setting the pre-needled felt in an oven at the temperature of 150 ℃ to obtain a spunlace felt filter material, wherein the spunlace speed is 5m/min, and the spunlace pressure is 380 bar;
and 4, step 4: and (4) drying and heat setting the spunlace felt filter material obtained in the step (3) to finally obtain the spunlace base fabric filter material. In this embodiment 3, the performance comparison between the polyphenylene sulfide spun-bonded base fabric spunlace filter material and the polyphenylene sulfide common needle-punched filter material is shown in table 3, and through the comparison, it can be found that, under the same gram weight, the warp and weft strength and the filtering accuracy of the polyphenylene sulfide spun-bonded base fabric spunlace filter material are superior to those of the polyphenylene sulfide common woven base fabric spunlace filter material, but the filter material has a larger gram weight, and the performance difference between the filter material and the conventional woven base fabric spunlace filter material is not great.
TABLE 3 comparison of the performance of the spun-bonded polyphenylene sulfide base fabric spunlace filter material and the common polyphenylene sulfide needled filter material
Figure BDA0001638769920000091
In summary, in this embodiment, according to the spun-bonded base fabric spunlace filter material and the preparation method thereof of this embodiment, the spun-bonded base fabric spunlace filter material and the preparation method thereof provided by this embodiment replace the original woven base fabric with the spun-bonded base fabric, since the base fabric prepared by the spun-bonded method is a filament non-woven layer and the fibers are thinner, the filtration precision and strength of the filter material can be significantly improved, in addition, the use of the common filter material is often affected due to the warp strength not meeting the standard, and the warp strength of the spun-bonded base fabric is greater than the weft strength, which can reinforce the filter material. In addition, the pore diameter among fibers in the filter material can be reduced by adopting the spunlace reinforcement, the surface of the filter material is more compact and smooth, the strength is high, the filtering precision is high, and the method is suitable for dust removal working conditions with fine dust particle size and high emission requirements.
The above description is only for the purpose of illustrating the present invention and is not intended to limit the scope of the present invention, and any person skilled in the art can substitute or change the technical solution of the present invention and its conception within the scope of the present invention.

Claims (5)

1. A spun-bonded base fabric spunlace filter material is characterized by sequentially comprising an upper layer of non-woven fabric (1), a first bonding layer (2), a spun-bonded base fabric layer (3), a second bonding layer (4) and a lower layer of non-woven fabric (5) from outside to inside, wherein the first bonding layer (2) is arranged between the upper layer of non-woven fabric (1) and the spun-bonded base fabric layer (3), the spun-bonded base fabric layer (3) is arranged between the first bonding layer (2) and the second bonding layer (4), and the second bonding layer (4) is arranged between the spun-bonded base fabric layer (3) and the lower layer of non-woven fabric (5); the first adhesive layer (2) and the second adhesive layer (4) are respectively bonded with the upper non-woven fabric (1) and the lower non-woven fabric (5) and the spunbonded base fabric layer (3) by adopting a size point method, the size point method is to prepare a sizing agent with certain viscosity from hot melt adhesive powder and a bottom sizing agent, then to apply the sizing agent to the non-woven fabric in a point shape by adopting a size point coating machine, and then to form the adhesive layer through high temperature and solidification, and the size point coating formula of the size point coating machine is as follows: water, emulsifier, polyethylene hot melt adhesive and thickener.
2. A spun-bonded base fabric spunlace filter material as claimed in claim 1, wherein the fiber material of the spun-bonded base fabric layer (3) is: polyester fibers or polyphenylene sulfide fibers.
3. A spun-bonded base fabric spunlace filter material as claimed in claim 1, wherein the fiber materials of the upper layer non-woven fabric (1) and the lower layer non-woven fabric (5) are as follows: polyester fibers or polyphenylene sulfide fibers.
4. A method for preparing a spun-bonded base fabric spunlace filter material according to any one of claims 1 to 3, which is characterized by comprising the following steps:
step 1: polyester fiber or polyphenylene sulfide fiber is subjected to opening, mixing, carding, lapping and grid connection, then added into the spunbonded base fabric, slurry is respectively sprayed between the upper non-woven fabric layer and the spunbonded base fabric layer and between the lower non-woven fabric layer and the spunbonded base fabric layer by a slurry point method, then the obtained fiber net layer is subjected to pressurization on the outer layer of the fiber net layer by a hot melting bonder under certain temperature, pressure and time, and after the slurry is cooled, the obtained fiber net layer is solidified, so that the upper non-woven fabric layer and the lower non-woven fabric layer are bonded together with the spunbonded base fabric layer, wherein the pressurization temperature is 110-;
step 2: putting the fiber web layer prepared in the step 1 into a pre-needling machine for pre-needling, wherein the pre-needling density is 60-100 punches/cm2；
And step 3: carrying out spunlace reinforcement on the pre-needled felt treated in the step 2, and directly drying and heat-setting the pre-needled felt in an oven at the temperature of 150-200 ℃ to obtain a spunlace felt filter material, wherein the spunlace speed is 3-10m/min, and the spunlace pressure is 200-380 bar;
and 4, step 4: and (4) drying and heat setting the spunlace felt filter material obtained in the step (3) to finally obtain the spunlace base fabric filter material.
5. The method for preparing a spun-bonded base fabric spunlace filter material as claimed in claim 4, wherein the step of preparing the spun-bonded base fabric comprises the following steps: the spun-bonded base fabric is prepared by taking thermoplastic materials of polyester and polyphenylene sulfide as raw materials and performing melt spinning on a high molecular polymer to form a net, wherein the prepared spun-bonded base fabric fiber material is a filament, and the fineness of the fiber is high<1dtex, the gram weight of the prepared spunbonded base fabric is 100-150g/m2。
CN201810372727.0A 2018-04-24 2018-04-24 Spun-bonded base fabric spunlace filter material and preparation method thereof Active CN108654209B (en)

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CN111139597A (en) * 2019-11-28 2020-05-12 徐州顺天工业用布有限公司 Polyester laying cloth and preparation method and application thereof
CN111939650A (en) * 2020-07-02 2020-11-17 无锡华南钢结构环保有限公司 Preparation process of boiler air filtering material
CN113174695B (en) * 2021-04-22 2022-09-16 杭州海滤新材料科技有限公司 High-water-absorption high-wear-resistance spunlace non-woven fabric and preparation method thereof

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