CN111939650A - Preparation process of boiler air filtering material - Google Patents
Preparation process of boiler air filtering material Download PDFInfo
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- CN111939650A CN111939650A CN202010638869.4A CN202010638869A CN111939650A CN 111939650 A CN111939650 A CN 111939650A CN 202010638869 A CN202010638869 A CN 202010638869A CN 111939650 A CN111939650 A CN 111939650A
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- fiber web
- spunlace
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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
- B01D39/16—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres
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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
- D04H1/4374—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
- D04H1/42—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
- 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
- D04H1/44—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 the fleeces or layers being consolidated by mechanical means, e.g. by rolling
- D04H1/46—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 the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres
- D04H1/48—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 the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres in combination with at least one other method of consolidation
- D04H1/49—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 the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres in combination with at least one other method of consolidation entanglement by fluid jet in combination with another consolidation means
-
- 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
- D04H1/58—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 applying, incorporating or activating chemical or thermoplastic bonding agents, e.g. adhesives
- D04H1/587—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 applying, incorporating or activating chemical or thermoplastic bonding agents, e.g. adhesives characterised by the bonding agents used
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- 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
- B01D2239/04—Additives and treatments of the filtering material
- B01D2239/0407—Additives and treatments of the filtering material comprising particulate additives, e.g. adsorbents
-
- 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
Abstract
The invention discloses a preparation process of a boiler air filtering material, which comprises the following steps: the method comprises the following steps: s1, preparing before spunlace; s2, opening by spunlacing; s3, carrying out spunlace reinforcement; s4, selecting auxiliary materials; s5, preprocessing; s6, secondary treatment; s7, filling; s8, folding and pressing; s9, drying; the preparation process of the boiler air filtering material realizes production through the steps of preparation before spunlacing, spunlace opening, spunlace reinforcement, auxiliary material selection, pretreatment, secondary treatment, material filling, folding, drying and the like, has the advantages of short production flow and convenience in manufacturing, and does not have the step of burning to pollute the atmosphere.
Description
Technical Field
The invention belongs to the field of boilers, and particularly relates to a preparation process of a boiler air filtering material.
Background
Air filtration under complex working conditions such as coal-fired boilers and waste incineration is a technical problem to be solved in the industry, and the preparation of the air filtration material is particularly critical mainly because working conditions such as the coal-fired boilers and the waste incineration have the problems of high temperature, strong corrosivity, strong oxidizability and the like.
The preparation method of the high-performance carbon fiber composite air filter material disclosed in the publication No. CN106237730A comprises the following steps: the method comprises the following steps: a primary mixing step; step two: a secondary mixing procedure; step three: a carding procedure; step four: a lapping process; step five: a needling process; step six: singeing; step seven: a dipping process; step eight: a shaping and drying process; step nine: and (5) film coating.
Although the above-mentioned preparation method of the high-performance carbon fiber composite air filter material can be used for manufacturing the air filter material, it still has some disadvantages, such as: the method has the disadvantages of more harmful substances during production, poor environmental-friendly performance of the adopted steps, expensive used materials, complex manufacturing process, high manufacturing cost and the like.
Disclosure of Invention
The invention aims to provide a preparation process of a boiler air filtering material, which aims to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a preparation process of a boiler air filter material comprises the following steps:
s1, preparation before hydroentangling: selecting a polypropylene fiber web and a polyethylene terephthalate fiber web as raw materials, flatly paving the polypropylene fiber web and the polyethylene terephthalate fiber web above a platform of a spunlace machine from top to bottom, and prewetting the polypropylene fiber web and the polyethylene terephthalate fiber web to discharge air in the polypropylene fiber web and the polyethylene terephthalate fiber web;
s2, spunlace opening: placing the polypropylene fiber net and the polyethylene terephthalate fiber net subjected to the S1 prewetting into a spunlace region of a spunlace machine, jetting a plurality of water jets by using water jetting holes of a water jetting plate of a spunlace head, and vertically jetting the water jets to the polypropylene fiber net and the polyethylene terephthalate fiber net, wherein the jetting water pressure is controlled to be 90-120 Bar;
s3, hydroentangling and reinforcing: carrying out spunlace reinforcement on the spunlace opening raw material obtained in the step S2 by using a spunlace machine, wherein a drum spunlace reinforcement mode is adopted during the spunlace reinforcement;
s4, selecting auxiliary materials: selecting the following components in parts by weight: polyvinyl alcohol: vinyl amide: epoxy resin: tertiary amine: cyanate ester: catalyst: the glue agent is 5: 4: 5: 3: 5: 1: 0.2: 9;
s5, preprocessing: uniformly mixing the waterborne polyurethane, the polyvinyl alcohol, the vinyl amide, the epoxy resin, the tertiary amine and the cyanate ester in the S4 by using a stirrer, then placing the mixture into a reaction kettle, controlling the temperature in the reaction kettle to be 123-128 ℃, and preserving the temperature for 30-40min to obtain a pretreatment solution;
s6, secondary treatment: cooling the pretreatment liquid obtained in the step S5 to 60-68 ℃, adding a catalyst, and uniformly stirring to obtain a secondary treatment liquid;
s7, filling: placing the fiber web treated in the S3 into the secondary treatment liquid obtained in the S6 for filling;
s8, folding and pressing: folding the filling material fiber web obtained in the step S7, and brushing a layer of the glue in the step S4 on the surface of the filling material fiber web before each folding;
s9, drying: and (3) firstly, carrying out cold drying and then carrying out hot drying on the folded and pressed material of S8.
Preferably, when the S3 is reinforced by the drum spunlace, the spunlace heads are arranged along the circumference of the drum, the polypropylene fiber web and the polyethylene terephthalate fiber web are adsorbed on the drum, the water pressure of the water spray holes on the water spray plate of the spunlace heads is controlled to be 130-150Bar, the drum is arranged to be a metal cylinder perforated structure, and the dewatering device is arranged inside the drum.
Preferably, the catalyst in the S4 selected auxiliary materials is one of DMSO, triethylamine and polyurethane.
Preferably, the adhesive in the selected auxiliary materials of S4 is one or more of a polyethylene hot melt adhesive, a polypropylene hot melt adhesive, a polyester hot melt adhesive, and a polyurethane hot melt adhesive.
Preferably, in the S5 pretreatment, the waterborne polyurethane, the polyvinyl alcohol, the vinyl amide, the epoxy resin, the tertiary amine and the cyanate ester in the S4 are stirred and mixed for 20-30min by a stirrer at the rotation speed of 2000-2300r/min, and the final fineness is controlled to be not more than 80 meshes.
Preferably, in the second treatment of S6, the pretreatment solution obtained in S5 is cooled to 64-66 ℃, and the catalyst is added by means of pump blowing and is stirred uniformly.
Preferably, when the material is filled in the S7 mode, the temperature of the secondary treatment liquid is controlled to be 20-25 ℃, the time for placing the fiber net in the secondary treatment liquid is not shorter than 1min, and the fiber net is immediately placed in a forming chamber with the temperature of 0-4 ℃ for solidification forming after being taken out.
Preferably, when the folding at S8 is performed, the filling material web obtained at S7 is folded, and the thickness of the glue layer brushed on the surface of the filling material web before each folding is 0.3-0.8 mm.
Preferably, when the S9 is dried, a quick freezing step is firstly carried out, the material after the S8 is folded and pressed is placed in a quick freezing machine with a quick freezing temperature of-25 to-45 ℃ for quick freezing, the quick freezing time is 10 to 40 minutes, the freezing air speed is 25 to 50 m/S, then the material is transferred into a hot oven, the temperature in the hot oven is controlled to be 80 to 110 ℃, and the hot drying time is controlled to be 30 to 40 minutes.
Compared with the prior art, the invention has the beneficial effects that:
(1) the main raw materials adopted by the invention are polypropylene fiber net and polyethylene terephthalate fiber net which are easily obtained raw materials, and other auxiliary materials such as waterborne polyurethane, polyvinyl alcohol, vinyl amide, epoxy resin, tertiary amine, cyanate ester and the like are also relatively cheap and easily obtained materials, so the cost of the raw materials for manufacturing the fiber is relatively low, and the pollution is relatively small.
(2) The invention realizes production through the steps of preparation before spunlace, spunlace opening, spunlace reinforcement, auxiliary material selection, pretreatment, secondary treatment, material filling, folding, pressing, drying and the like, has the advantages of short production process, optimized process and favorable transition between the process and the process, and has no link of atmosphere pollution caused by burning.
Drawings
FIG. 1 is a block flow diagram of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the embodiment of the present invention is as follows:
example 1
A preparation process of a boiler air filter material comprises the following steps:
s1, preparation before hydroentangling: selecting a polypropylene fiber web and a polyethylene terephthalate fiber web as raw materials, flatly paving the polypropylene fiber web and the polyethylene terephthalate fiber web above a platform of a spunlace machine from top to bottom, and prewetting the polypropylene fiber web and the polyethylene terephthalate fiber web to discharge air in the polypropylene fiber web and the polyethylene terephthalate fiber web;
s2, spunlace opening: placing the polypropylene fiber net and the polyethylene terephthalate fiber net subjected to the S1 prewetting into a spunlace region of a spunlace machine, jetting a plurality of water jets by using water jetting holes of a water jetting head water jetting plate, vertically jetting the water jets to the polypropylene fiber net and the polyethylene terephthalate fiber net, and controlling the jetting water pressure to be 90 Bar;
s3, hydroentangling and reinforcing: carrying out spunlace reinforcement on the spunlace opening raw material obtained in the step S2 by using a spunlace machine, wherein a drum spunlace reinforcement mode is adopted during the spunlace reinforcement;
s4, selecting auxiliary materials: selecting the following components in parts by weight: polyvinyl alcohol: vinyl amide: epoxy resin: tertiary amine: cyanate ester: catalyst: the glue agent is 5: 4: 5: 3: 5: 1: 0.2: 9;
s5, preprocessing: uniformly mixing the waterborne polyurethane, the polyvinyl alcohol, the vinyl amide, the epoxy resin, the tertiary amine and the cyanate ester in the S4 by using a stirrer, then placing the mixture into a reaction kettle, controlling the temperature in the reaction kettle to be 123 ℃, and preserving the temperature for 30min to obtain a pretreatment solution;
s6, secondary treatment: cooling the pretreatment liquid obtained in the step S5 to 60 ℃, adding a catalyst, and uniformly stirring to obtain a secondary treatment liquid;
s7, filling: placing the fiber web treated by the S3 into the secondary treatment liquid obtained by the S6 for filling;
s8, folding and pressing: folding the filling material fiber web obtained in the step S7, and brushing a layer of glue in the step S4 on the surface of the filling material fiber web before each folding;
s9, drying: and (5) firstly, carrying out cold drying and then carrying out hot drying on the folded and pressed material of S8.
In this embodiment, preferably, when the S3 is reinforced by hydroentangling with a drum, the hydroentangling heads are arranged along the circumference of the drum, the polypropylene fiber web and the polyethylene terephthalate fiber web are adsorbed on the drum, the water pressure of the water jet holes on the water jet plate of the hydroentangling head is controlled to be 130Bar, the drum is set to be a metal cylinder perforated structure, and a dewatering device is arranged in the drum.
In this embodiment, it is preferable that the catalyst in the adjuvant selected in S4 is DMSO.
In this embodiment, preferably, the adhesive in the auxiliary materials selected in S4 is a polyethylene hot melt adhesive.
In this embodiment, preferably, in the pretreatment of S5, the aqueous polyurethane, polyvinyl alcohol, vinyl amide, epoxy resin, tertiary amine, and cyanate ester in S4 are stirred and mixed by a stirrer at 2000r/min for 20min, and the final fineness is controlled to 60 mesh.
In this example, it is preferable that, in the second treatment of S6, the pretreatment liquid obtained in S5 is cooled to 64 ℃, and the catalyst is added by pumping and stirred uniformly.
In this embodiment, preferably, when filling in S7, the temperature of the secondary treatment liquid is controlled to 20 ℃, the time for placing the fiber web in the secondary treatment liquid is 2min, and the fiber web is immediately placed in the forming chamber at a temperature of 0 ℃ for solidification forming after being taken out.
In this embodiment, preferably, when folding at S8, the filling material web obtained at S7 is folded, and the thickness of the glue layer brushed on the surface before each folding is 0.3 mm.
In this embodiment, preferably, in the step of drying at S9, a quick freezing step is performed, in which the material after being folded at S8 is placed in a quick freezer at a quick freezing temperature of-25 ℃ for quick freezing for 10 minutes at a freezing air speed of 25 m/S, and then transferred to a hot oven at a temperature of 80 ℃ for 30 minutes.
Example 2
A preparation process of a boiler air filter material comprises the following steps:
s1, preparation before hydroentangling: selecting a polypropylene fiber web and a polyethylene terephthalate fiber web as raw materials, flatly paving the polypropylene fiber web and the polyethylene terephthalate fiber web above a platform of a spunlace machine from top to bottom, and prewetting the polypropylene fiber web and the polyethylene terephthalate fiber web to discharge air in the polypropylene fiber web and the polyethylene terephthalate fiber web;
s2, spunlace opening: placing the polypropylene fiber net and the polyethylene terephthalate fiber net subjected to the S1 prewetting into a spunlace region of a spunlace machine, jetting a plurality of water jets by using water jetting holes of a water jetting plate of a spunlace head, and vertically jetting the water jets to the polypropylene fiber net and the polyethylene terephthalate fiber net, wherein the jetting water pressure is controlled to be 120 Bar;
s3, hydroentangling and reinforcing: carrying out spunlace reinforcement on the spunlace opening raw material obtained in the step S2 by using a spunlace machine, wherein a drum spunlace reinforcement mode is adopted during the spunlace reinforcement;
s4, selecting auxiliary materials: selecting the following components in parts by weight: polyvinyl alcohol: vinyl amide: epoxy resin: tertiary amine: cyanate ester: catalyst: the glue agent is 5: 4: 5: 3: 5: 1: 0.2: 9;
s5, preprocessing: uniformly mixing the waterborne polyurethane, the polyvinyl alcohol, the vinyl amide, the epoxy resin, the tertiary amine and the cyanate ester in the S4 by using a stirrer, then placing the mixture into a reaction kettle, controlling the temperature in the reaction kettle to be 128 ℃, and preserving the temperature for 30min to obtain a pretreatment solution;
s6, secondary treatment: cooling the pretreatment liquid obtained in the step S5 to 68 ℃, adding a catalyst, and uniformly stirring to obtain a secondary treatment liquid;
s7, filling: placing the fiber web treated by the S3 into the secondary treatment liquid obtained by the S6 for filling;
s8, folding and pressing: folding the filling material fiber web obtained in the step S7, and brushing a layer of glue in the step S4 on the surface of the filling material fiber web before each folding;
s9, drying: and (5) firstly, carrying out cold drying and then carrying out hot drying on the folded and pressed material of S8.
In this embodiment, preferably, when the S3 is reinforced by hydroentangling with a drum, the hydroentangling heads are arranged along the circumference of the drum, the polypropylene fiber web and the polyethylene terephthalate fiber web are adsorbed on the drum, the water pressure of the water jet holes on the water jet plate of the hydroentangling head is controlled to be 150Bar, the drum is set to be a metal cylinder perforated structure, and a dewatering device is arranged in the drum.
In this embodiment, preferably, the catalyst in the auxiliary material selected in S4 is triethylamine.
In this embodiment, preferably, the adhesive in the auxiliary materials selected in S4 is a polypropylene hot melt adhesive.
In this embodiment, preferably, in the pretreatment of S5, the aqueous polyurethane, polyvinyl alcohol, vinyl amide, epoxy resin, tertiary amine, and cyanate ester in S4 are stirred and mixed by a stirrer at 2300r/min for 20min, and the final fineness is controlled to 65 mesh.
In this example, it is preferable that, in the second treatment of S6, the pretreatment liquid obtained in S5 is cooled to 66 ℃, and the catalyst is added by pumping and stirred uniformly.
In this embodiment, preferably, when filling in S7, the temperature of the secondary treatment liquid is controlled to be 25 ℃, the time for placing the fiber web in the secondary treatment liquid is 3min, and the fiber web is immediately placed in the forming chamber at a temperature of 4 ℃ for solidification forming after being taken out.
In this embodiment, preferably, when folding at S8, the filling material web obtained at S7 is folded, and the thickness of the glue layer brushed on the surface before each folding is 0.8 mm.
In this embodiment, preferably, in the step of drying at S9, a quick freezing step is performed, in which the material after being folded at S8 is placed in a quick freezer at a quick freezing temperature of-45 ℃ for quick freezing at a freezing air speed of 25 m/S for 10 minutes, and then transferred to a hot oven at a temperature of 110 ℃ for 40 minutes.
Example 3
A preparation process of a boiler air filter material comprises the following steps:
s1, preparation before hydroentangling: selecting a polypropylene fiber web and a polyethylene terephthalate fiber web as raw materials, flatly paving the polypropylene fiber web and the polyethylene terephthalate fiber web above a platform of a spunlace machine from top to bottom, and prewetting the polypropylene fiber web and the polyethylene terephthalate fiber web to discharge air in the polypropylene fiber web and the polyethylene terephthalate fiber web;
s2, spunlace opening: placing the polypropylene fiber net and the polyethylene terephthalate fiber net subjected to the S1 prewetting into a spunlace region of a spunlace machine, jetting a plurality of water jets by using water jetting holes of a water jetting head water jetting plate, vertically jetting the water jets to the polypropylene fiber net and the polyethylene terephthalate fiber net, and controlling the jetting water pressure to be 100 Bar;
s3, hydroentangling and reinforcing: carrying out spunlace reinforcement on the spunlace opening raw material obtained in the step S2 by using a spunlace machine, wherein a drum spunlace reinforcement mode is adopted during the spunlace reinforcement;
s4, selecting auxiliary materials: selecting the following components in parts by weight: polyvinyl alcohol: vinyl amide: epoxy resin: tertiary amine: cyanate ester: catalyst: the glue agent is 5: 4: 5: 3: 5: 1: 0.2: 9;
s5, preprocessing: uniformly mixing the waterborne polyurethane, the polyvinyl alcohol, the vinyl amide, the epoxy resin, the tertiary amine and the cyanate ester in the S4 by using a stirrer, then placing the mixture into a reaction kettle, controlling the temperature in the reaction kettle to be 125 ℃, and preserving the temperature for 40min to obtain a pretreatment solution;
s6, secondary treatment: cooling the pretreatment liquid obtained in the step S5 to 68 ℃, adding a catalyst, and uniformly stirring to obtain a secondary treatment liquid;
s7, filling: placing the fiber web treated by the S3 into the secondary treatment liquid obtained by the S6 for filling;
s8, folding and pressing: folding the filling material fiber web obtained in the step S7, and brushing a layer of glue in the step S4 on the surface of the filling material fiber web before each folding;
s9, drying: and (5) firstly, carrying out cold drying and then carrying out hot drying on the folded and pressed material of S8.
In this embodiment, preferably, when the S3 is reinforced by hydroentangling with a drum, the hydroentangling heads are arranged along the circumference of the drum, the polypropylene fiber web and the polyethylene terephthalate fiber web are adsorbed on the drum, the water pressure of the water jet holes on the water jet plate of the hydroentangling head is controlled to be 140Bar, the drum is set to be a metal cylinder perforated structure, and a dewatering device is arranged in the drum.
In this embodiment, preferably, the catalyst in the auxiliary material selected in S4 is polyurethane.
In this embodiment, preferably, the adhesive in the S4-selected auxiliary material is a polyethylene hot melt adhesive, a polypropylene hot melt adhesive, a polyester hot melt adhesive, and a polyurethane hot melt adhesive in a weight ratio of 1: 1: 1: 1.
In this embodiment, preferably, in the pretreatment of S5, the aqueous polyurethane, polyvinyl alcohol, vinyl amide, epoxy resin, tertiary amine, and cyanate ester in S4 are stirred and mixed by a stirrer at 2300r/min for 20min, and the final fineness is controlled to 65 mesh.
In this example, it is preferable that, in the second treatment of S6, the pretreatment liquid obtained in S5 is cooled to 66 ℃, and the catalyst is added by pumping and stirred uniformly.
In this embodiment, preferably, when filling in S7, the temperature of the secondary treatment liquid is controlled to be 25 ℃, the time for placing the fiber web in the secondary treatment liquid is 3min, and the fiber web is immediately placed in the forming chamber at a temperature of 4 ℃ for solidification forming after being taken out.
In this embodiment, preferably, when folding at S8, the filling material web obtained at S7 is folded, and the thickness of the glue layer brushed on the surface before each folding is 0.8 mm.
In this embodiment, preferably, in the step of drying at S9, a quick freezing step is performed, in which the material after being folded at S8 is placed in a quick freezer at a quick freezing temperature of-45 ℃ for quick freezing at a freezing air speed of 25 m/S for 10 minutes, and then transferred to a hot oven at a temperature of 110 ℃ for 40 minutes.
Example 4
A preparation process of a boiler air filter material comprises the following steps:
s1, preparation before hydroentangling: selecting a polypropylene fiber web and a polyethylene terephthalate fiber web as raw materials, flatly paving the polypropylene fiber web and the polyethylene terephthalate fiber web above a platform of a spunlace machine from top to bottom, and prewetting the polypropylene fiber web and the polyethylene terephthalate fiber web to discharge air in the polypropylene fiber web and the polyethylene terephthalate fiber web;
s2, spunlace opening: placing the polypropylene fiber net and the polyethylene terephthalate fiber net subjected to the S1 prewetting into a spunlace region of a spunlace machine, jetting a plurality of water jets by using water jetting holes of a water jetting head water jetting plate, vertically jetting the water jets to the polypropylene fiber net and the polyethylene terephthalate fiber net, and controlling the jetting water pressure to be 100 Bar;
s3, hydroentangling and reinforcing: carrying out spunlace reinforcement on the spunlace opening raw material obtained in the step S2 by using a spunlace machine, wherein a drum spunlace reinforcement mode is adopted during the spunlace reinforcement;
s4, selecting auxiliary materials: selecting the following components in parts by weight: polyvinyl alcohol: vinyl amide: epoxy resin: tertiary amine: cyanate ester: catalyst: the glue agent is 5: 4: 5: 3: 5: 1: 0.2: 9;
s5, preprocessing: uniformly mixing the waterborne polyurethane, the polyvinyl alcohol, the vinyl amide, the epoxy resin, the tertiary amine and the cyanate ester in the S4 by using a stirrer, then placing the mixture into a reaction kettle, controlling the temperature in the reaction kettle to be 125 ℃, and preserving the temperature for 40min to obtain a pretreatment solution;
s6, secondary treatment: cooling the pretreatment liquid obtained in the step S5 to 68 ℃, adding a catalyst, and uniformly stirring to obtain a secondary treatment liquid;
s7, filling: placing the fiber web treated by the S3 into the secondary treatment liquid obtained by the S6 for filling;
s8, folding and pressing: folding the filling material fiber web obtained in the step S7, and brushing a layer of glue in the step S4 on the surface of the filling material fiber web before each folding;
s9, drying: and (5) firstly, carrying out cold drying and then carrying out hot drying on the folded and pressed material of S8.
In this embodiment, preferably, when the S3 is reinforced by hydroentangling with a drum, the hydroentangling heads are arranged along the circumference of the drum, the polypropylene fiber web and the polyethylene terephthalate fiber web are adsorbed on the drum, the water pressure of the water jet holes on the water jet plate of the hydroentangling head is controlled to 145Bar, the drum is set to be a metal cylinder perforated structure, and a dewatering device is arranged inside the drum.
In this embodiment, preferably, the catalyst in the auxiliary material selected in S4 is polyurethane.
In this embodiment, preferably, the adhesive in the S4-selected auxiliary material is a polyethylene hot melt adhesive, a polypropylene hot melt adhesive, and a polyester hot melt adhesive in a weight ratio of 1: 2: 1.
In this embodiment, preferably, in the pretreatment of S5, the aqueous polyurethane, polyvinyl alcohol, vinyl amide, epoxy resin, tertiary amine, and cyanate ester in S4 are stirred and mixed by a stirrer at 2300r/min for 20min, and the final fineness is controlled to 65 mesh.
In this example, it is preferable that, in the second treatment of S6, the pretreatment liquid obtained in S5 is cooled to 66 ℃, and the catalyst is added by pumping and stirred uniformly.
In this embodiment, preferably, when filling in S7, the temperature of the secondary treatment liquid is controlled to be 25 ℃, the time for placing the fiber web in the secondary treatment liquid is 3min, and the fiber web is immediately placed in the forming chamber at a temperature of 4 ℃ for solidification forming after being taken out.
In this embodiment, preferably, when folding at S8, the filling material web obtained at S7 is folded, and the thickness of the glue layer brushed on the surface before each folding is 0.6 mm.
In this embodiment, preferably, in the step of drying at S9, a quick freezing step is performed, in which the material after being folded at S8 is placed in a quick freezer at a quick freezing temperature of-30 ℃ for quick freezing at a freezing air speed of 25 m/S for 10 minutes, and then transferred to a hot oven at a temperature of 100 ℃ for 40 minutes.
The filter materials obtained in examples 1 to 4 were subjected to tests of top filtration capacity, crushing strength and compression strength, and it was found that the air filter material obtained in example 3 was the most preferable, so that example 3 was the most preferable example.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. A preparation process of a boiler air filter material is characterized by comprising the following steps: the method comprises the following steps:
s1, preparation before hydroentangling: selecting a polypropylene fiber web and a polyethylene terephthalate fiber web as raw materials, flatly paving the polypropylene fiber web and the polyethylene terephthalate fiber web above a platform of a spunlace machine from top to bottom, and prewetting the polypropylene fiber web and the polyethylene terephthalate fiber web to discharge air in the polypropylene fiber web and the polyethylene terephthalate fiber web;
s2, spunlace opening: placing the polypropylene fiber net and the polyethylene terephthalate fiber net subjected to the S1 prewetting into a spunlace region of a spunlace machine, jetting a plurality of water jets by using water jetting holes of a water jetting plate of a spunlace head, and vertically jetting the water jets to the polypropylene fiber net and the polyethylene terephthalate fiber net, wherein the jetting water pressure is controlled to be 90-120 Bar;
s3, hydroentangling and reinforcing: carrying out spunlace reinforcement on the spunlace opening raw material obtained in the step S2 by using a spunlace machine, wherein a drum spunlace reinforcement mode is adopted during the spunlace reinforcement;
s4, selecting auxiliary materials: selecting the following components in parts by weight: polyvinyl alcohol: vinyl amide: epoxy resin: tertiary amine: cyanate ester: catalyst: the glue agent is 5: 4: 5: 3: 5: 1: 0.2: 9;
s5, preprocessing: uniformly mixing the waterborne polyurethane, the polyvinyl alcohol, the vinyl amide, the epoxy resin, the tertiary amine and the cyanate ester in the S4 by using a stirrer, then placing the mixture into a reaction kettle, controlling the temperature in the reaction kettle to be 123-128 ℃, and preserving the temperature for 30-40min to obtain a pretreatment solution;
s6, secondary treatment: cooling the pretreatment liquid obtained in the step S5 to 60-68 ℃, adding a catalyst, and uniformly stirring to obtain a secondary treatment liquid;
s7, filling: placing the fiber web treated in the S3 into the secondary treatment liquid obtained in the S6 for filling;
s8, folding and pressing: folding the filling material fiber web obtained in the step S7, and brushing a layer of the glue in the step S4 on the surface of the filling material fiber web before each folding;
s9, drying: and (3) firstly, carrying out cold drying and then carrying out hot drying on the folded and pressed material of S8.
2. The preparation process of the boiler air filter material according to claim 1, wherein the preparation process comprises the following steps: when S3 is reinforced by adopting the spunlace of the rotary drum, the spunlace heads are arranged along the circumference of the rotary drum, the polypropylene fiber web and the polyethylene terephthalate fiber web are adsorbed on the rotary drum, the water pressure of the water spray holes on the water spray plate of the spunlace heads is controlled to be 130-.
3. The preparation process of the boiler air filter material according to claim 1, wherein the preparation process comprises the following steps: the catalyst in the S4 selected auxiliary materials is one of DMSO, triethylamine and polyurethane.
4. The preparation process of the boiler air filter material according to claim 1, wherein the preparation process comprises the following steps: and S4, selecting one or more of polyethylene hot melt adhesive, polypropylene hot melt adhesive, polyester hot melt adhesive and polyurethane hot melt adhesive as the adhesive in the auxiliary materials.
5. The preparation process of the boiler air filter material according to claim 1, wherein the preparation process comprises the following steps: in the S5 pretreatment, the waterborne polyurethane, the polyvinyl alcohol, the vinyl amide, the epoxy resin, the tertiary amine and the cyanate ester in the S4 are stirred and mixed for 20-30min by a stirrer at the rotating speed of 2000-2300r/min, and the final fineness is controlled to be not more than 80 meshes.
6. The preparation process of the boiler air filter material according to claim 1, wherein the preparation process comprises the following steps: and in the S6 secondary treatment, the pretreatment liquid obtained in the S5 is cooled to 64-66 ℃, and a catalyst is added in a pump blowing mode and is uniformly stirred.
7. The preparation process of the boiler air filter material according to claim 1, wherein the preparation process comprises the following steps: and when the S7 is filled, controlling the temperature of the secondary treatment liquid to be 20-25 ℃, placing the fiber web in the secondary treatment liquid for not less than 1min, and immediately placing the fiber web in a forming chamber with the temperature of 0-4 ℃ for solidification forming after taking out the fiber web.
8. The preparation process of the boiler air filter material according to claim 1, wherein the preparation process comprises the following steps: and when the S8 is folded, folding the filling material fiber web obtained in the S7, wherein the thickness of the glue layer brushed on the surface of the filling material fiber web before each folding is 0.3-0.8 mm.
9. The preparation process of the boiler air filter material according to claim 1, wherein the preparation process comprises the following steps: when the S9 is dried, firstly, a quick freezing step is carried out, the material folded and pressed in the S8 mode is placed in a quick freezing machine with a quick freezing temperature of-25 ℃ to-45 ℃ for quick freezing, the quick freezing time is 10-40 minutes, the freezing air speed is 25-50 m/S, then the material is transferred into a hot oven, the temperature in the hot oven is controlled to be 80-110 ℃, and the hot drying time is controlled to be 30-40 min.
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