CN115847963A - Antimony-free low-melting-point reverse osmosis membrane filter screen support and preparation method thereof - Google Patents
Antimony-free low-melting-point reverse osmosis membrane filter screen support and preparation method thereof Download PDFInfo
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Abstract
The invention discloses an antimony-free low-melting-point reverse osmosis membrane filter screen support body and a preparation method thereof, wherein a reverse osmosis membrane filter screen support material is prepared by sequentially arranging an upper layer fiber web, a middle fiber web and a lower layer fiber web from top to bottom through hot pressing treatment; the upper layer fiber web and the lower layer fiber web are spun-bonded non-woven material layers; the spunbond nonwoven layer is made from thermoplastic polymer spunbond filaments; the intermediate web is a polymeric nanofiber film. The preparation method comprises the following steps: preparing a lower layer fiber web and an upper layer fiber web by melt spinning, and preparing a middle layer fiber web by a solution jet spinning method; hot pressing; padding a finishing liquid; drying; and (6) packaging. The preparation method of the antimony-free low-melting-point reverse osmosis membrane filter screen support overcomes the defects of the prior art, and provides the preparation method of the antimony-free low-melting-point reverse osmosis membrane filter screen support which is thin in thickness, smooth in coating surface, high in flatness, high in strength and uniform in hole distribution.
Description
Technical Field
The invention belongs to the technical field of liquid filtering materials and separation manufacturing, and particularly relates to an antimony-free low-melting-point reverse osmosis membrane filter screen support and a preparation method thereof.
Background
Reverse osmosis is a high-efficiency liquid membrane separation technology developed in recent decades, has the advantages of high purification rate, low cost and the like, and is widely applied to the fields of seawater desalination, wastewater treatment, hard water softening, drinking water purification and the like at present. Generally, reverse osmosis membranes are composed of a nonwoven fabric layer, a porous support layer, and a membrane. The support body is the basic part of the reverse osmosis membrane and has the characteristics of high mechanical strength, large pore diameter, large porosity and the like. The reverse osmosis support body has the requirements of uniform fiber distribution, good micropore uniform distribution structure, high longitudinal and transverse tensile strength, low heat shrinkage rate, high air permeability, smooth coating surface, no fluffiness, high porosity, uniform and consistent thickness and the like.
In the reverse osmosis membrane, the preparation of the non-woven fabric support layer is particularly critical, and the non-woven fabric support layer prepared by the preparation method in the prior art also has various problems: if the support layer prepared by the spunbond method is adopted, although the fiber web formed by continuous fibers has high strength and is not easy to fluff, the thickness of the support layer is increased due to overlong fibers and larger surface pore diameters, and the requirement of thinning the reverse osmosis membrane cannot be met; in addition, the non-woven fabric supporting layer prepared by the spunbond method is easy to cause serious leakage problem, and the excessive penetration in some places can be generated to cause print-through when the high molecular polymer solution is delayed, so that film making equipment is polluted; in the wet process, the ratio of the fiber diameter to the fiber length needs to be set within a certain range in order to obtain a material having a good uniformity, and thus the fiber length needs to be shortened, which causes a decrease in the strength of the nonwoven fabric, and also causes a phenomenon that the surface of the web is fluffed, the smoothness is lowered, and the fiber entanglement dispersibility is poor. Therefore, the performance of the support material prepared by the method can not meet the comprehensive requirements of the thinness and high functionality of the reverse osmosis membrane, and the preparation method of the antimony-free low-melting-point reverse osmosis membrane filter screen support body has important significance.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a preparation method of a filter screen support body of a reverse osmosis membrane without antimony and with low melting point, which overcomes the defects in the prior art and has the advantages of thin thickness, smooth coating surface, high flatness, uniform pore distribution and high porosity.
In order to achieve the above purpose, the invention provides the following technical scheme:
the invention provides an antimony-free low-melting-point reverse osmosis membrane filter screen support body, wherein a reverse osmosis membrane filter screen support material is prepared by sequentially arranging an upper layer fiber web, a middle fiber web and a lower layer fiber web from top to bottom through hot pressing; the upper layer fiber web and the lower layer fiber web are spun-bonded non-woven material layers; the spunbond nonwoven layer is made of thermoplastic polymer spunbond filaments; the intermediate web is a polymeric nanofiber film.
The upper layer fiber web is prepared by 70-80 wt% of small-diameter polymer and 30-40 wt% of hot-melt fiber, and the weight of the upper layer fiber web is 20g/m 2 -30g/m 2 ；
The lower layer fiber web is composed of 80-90 wt% of thick-diameter polymer and 20-30 wt% of hot-melt fiber, and the basis weight of the lower layer fiber web is 30g/m 2 -40g/m 2 ；
Preferably, the diameter of the large-diameter polymer is between 12 and 22pm, the diameter of the small-diameter polyester fiber is between 7 and 17 pm, and the dispersing agent is polyoxyethylene.
Preferably, the polymer comprises one or more of polyamide, polyester, polypropylene, polylactic acid and polystyrene; the hot-melt fiber comprises low-melting-point polyvinyl acetate/polyvinyl acetate composite fiber with the fiber melting point of 100-145 ℃, polyethylene fiber or ES composite fiber of polyethylene/polypropylene.
The components of the intermediate fiber web are as follows: 12-16% of polyamide 6 (PA 6), 60-70% of anhydrous formic acid, 10-20% of polyacrylonitrile, 5-9% of cosolvent and 3-6% of catalyst.
Preferably, the cosolvent is N, N-dimethylformamide;
preferably, polyamide 6 and N, N-dimethylformamide are analytically pure with low interfering impurities;
preferably, the anhydrous formic acid has a purity of 99.99%.
Preferably, the catalyst is polyvinylpyrrolidone, has a low melting point, can be melted by heating to 130 ℃ generally, and the main fiber can keep the original shape.
The invention provides a preparation method of the reverse osmosis membrane filter screen support body in the technical scheme, which comprises the following steps:
s1: spinning the thermoplastic polymer by adopting a melt spinning technology to obtain spun-bonded filaments, and carrying out filament dividing and net laying on the spun-bonded filaments to obtain a spun-bonded non-woven material layer serving as a lower-layer fiber web;
s2: spinning a polymer nanofiber membrane on the surface of the lower fiber web by adopting a solution jet spinning method to form a middle fiber web;
s3: spinning a thermoplastic polymer by adopting a melt spinning technology to obtain spun-bonded filaments, and performing filament splitting and net laying on the surfaces of the middle-layer fiber nets to obtain spun-bonded non-woven material layers serving as the middle-layer fiber nets to obtain a layered material;
s4: hot-pressing the obtained layered material by using a hot press to obtain a gray cloth;
s5: preparing finishing liquid, namely placing the hot-pressed gray cloth in a padding device for padding the finishing liquid;
s6: finishing: pre-drying at 100-130 deg.C for 1-3min; baking at 140-150 deg.C for 3-6min; washing with water, washing with cold water for 3-5min, and washing with hot water for 2-4min; drying at 80-100 deg.C to obtain a reverse osmosis membrane filter support;
s7: packaging and coding: winding the reverse osmosis membrane filter support body on a roller made of a paper material, and coding to obtain a finished product roll; recording: and recording the finished product roll and then warehousing.
Preferably, the finishing liquid in the step S5 consists of the following components in parts by weight: 20-30% of polyvinyl acetate, 10-15% of waterborne epoxy curing agent, 8-12% of polyvinyl alcohol and 15-25% of water.
Preferably, the finishing liquid in the step S5 consists of the following components in parts by weight: 20% of polyvinyl acetate, 10% of water-based epoxy curing agent, 8% of polyvinyl alcohol and 15% of water.
Preferably, the finishing liquor in the step S5 consists of the following components in parts by weight: 30% of polyvinyl acetate, 15% of waterborne epoxy curing agent, 12% of polyvinyl alcohol and 25% of water.
The solution jet spinning in the step S2 comprises the following specific preparation steps:
(1) Weighing raw materials: weighing proper amount of polyamide 6, polyacrylonitrile and polyvinylpyrrolidone powder;
(2) Stirring the powder, mixing the raw material powder weighed according to the proportion, putting the mixture into a crushing and stirring tank, continuously crushing and stirring for half an hour, and taking out the mixed raw material;
(3) Preparing a solution, dissolving the mixed powder after crushing and stirring in a proper amount of anhydrous formic acid, and adding a proper amount of N, N-dimethylformamide cosolvent;
(4) Performing hot melting processing, pouring the prepared solution into a hot melting stirrer, heating and stirring at 250 ℃, stirring until the raw materials are completely melted and uniformly mixed, standing to normal temperature, taking out, putting into a double-roller rolling machine, repeatedly rolling, and extruding bubbles;
(5) Preparing spinning, namely putting the uniformly mixed raw material solution into a liquid storage tank, heating at high temperature for drawing, and spraying out the raw material solution from a spinning nozzle to form nano fibers;
(6) Forming yarn, forming the nano fiber into funnel-shaped nano fiber net with oriented structure by a collecting device, and gradually winding and shrinking the fiber at the top of the funnel into nano fiber yarn by the drawing action of a winding roller and the twisting action of a rotating shaft and a receiving disc.
The solution jet spinning device for continuously preparing the nanofiber yarns has the working principle that:
the polymer spinning solution flows to a spinning nozzle from a liquid conveying pipe under the action of a feeding pump, is sprayed out from the spinning nozzle to form polymer trickle under the action of solution extrusion pressure and normal-temperature high-speed airflow, and the polymer trickle sprayed by the solution is further stretched and refined under the action of drafting wind of the high-speed airflow and enters a high-temperature spinning box body; the solvent is rapidly volatilized under the high-temperature environment of the box body, the solution trickles and solidifies to form the nano-fibers, and the nano-fibers fall on the receiving net under the action of suction wind to obtain the non-woven nano-fiber felt.
At the beginning of spinning, one end of a yarn withdrawal is tied to the winding rod, and the other end is suspended on the receiving disc through the yarn guide tube for a distance of about 10 cm. The solution is sprayed to generate nano fiber which is firstly received between the yarn guiding disc and the receiving disc, the fiber between the disc and the yarn guiding disc is more and more along with the rotation of the receiving disc, and at a certain moment, the rotating shaft is opened in sequence according to the winding roller, so that the fiber is gradually bunched and twisted into a continuous yarn under the traction force of the winding roller and the twisting force of the yarn guide tube driven by the rotating shaft.
A solution jet spinning device of a antimony-free low-melting-point reverse osmosis membrane filter screen support comprises a liquid storage tank 1, a feed pump 2, a liquid conveying pipe 3, a spinning nozzle 4, a hot air plate 5, a spinning box 6, a receiving net 7, normal temperature air 8, a distribution net 9, a gas storage tank 10, hot air 11, a heater 12 and a fan 13.
The liquid storage tank 1 is connected with one end of the feeding pump 2, the other end of the feeding pump 2 is connected with one end of the liquid conveying pipe 3, so the other end of the liquid conveying pipe 3 is connected with one end of the spinning nozzle 4, the hot air plate 5 is arranged below the spinning nozzle 4, the spinning box 6 is arranged below the hot air plate 5 and tightly attached to the hot air plate 5, the receiving net 7 is arranged below the inner part of the spinning box 6, one end of the normal temperature air 8 is connected with the other end of the spinning nozzle 4, one end of the distribution net 9 is connected with the other end of the normal temperature air 8, and the gas storage tank 10 is connected with the other end of the distribution net 9.
One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:
1. according to the preparation method of the antimony-free low-melting-point reverse osmosis membrane filter screen support body, the environment-friendly antimony-free material is adopted to replace a metal antimony-containing material in the catalyst, so that the problems that a heavy metal antimony compound is harmful to human health and antimony-containing wastewater pollutes the ecological environment are solved.
2. The invention discloses a preparation method of a support body of a filter screen of a antimony-free low-melting-point reverse osmosis membrane, which overcomes the defects of the prior art and provides the preparation method of the support body of the filter screen of the antimony-free low-melting-point reverse osmosis membrane, which has the advantages of thin thickness, smooth coating surface, high flatness, high strength and uniform hole distribution.
3. The preparation method of the antimony-free low-melting-point reverse osmosis membrane filter screen support can obtain continuous nano-fiber yarns, not only can obtain yarns in the traditional sense, but also can realize the multifunction of final products by trying to dope spinning solutions or spinning processes, and obtain multifunctional nano-yarns.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the description below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on the drawings without creative efforts. In the drawings:
FIG. 1 is a schematic flow diagram of the steps for preparing a support for a low melting point reverse osmosis membrane filter screen without antimony;
FIG. 2 is a schematic view of a solution jet spinning apparatus without antimony low melting point RO membrane screen support.
Wherein: 1. a liquid storage tank; 2. a feed pump; 3. a transfusion tube; 4. a spinneret; 5. a hot blast plate; 6. a spinning box; 7. receiving a net; 8. normal temperature wind; 9. a distribution network; 10. a gas storage tank; 11. hot air; 12. a heater; 13. fan blower
Detailed Description
The antimony-free low-melting point reverse osmosis membrane filter screen support provided by the invention is described in detail with reference to fig. 1.
Example one
The invention provides an antimony-free low-melting-point reverse osmosis membrane filter screen support body, wherein a reverse osmosis membrane filter screen support material is prepared by sequentially arranging an upper layer fiber web, a middle fiber web and a lower layer fiber web from top to bottom through hot pressing; the upper layer fiber web and the lower layer fiber web are spun-bonded non-woven material layers; the spunbond nonwoven layer is made of thermoplastic polymer spunbond filaments; the intermediate web is a polymeric nanofiber membrane.
The upper layer fiber web is prepared by 70-80 wt% of small-diameter polymer and 30-40 wt% of hot-melt fiber, and the weight of the upper layer fiber web is 20g/m 2 -30g/m 2 ；
The lower layer fiber web is composed of 80-90 wt% of thick-diameter polymer and 20-30 wt% of hot-melt fiber, and the basis weight of the lower layer fiber web is 30g/m 2 -40g/m 2 ；
Preferably, the diameter of the large-diameter polymer is between 12 and 22pm, the diameter of the small-diameter polyester fiber is between 7 and 17 μm, and the dispersing agent is polyethylene oxide.
Preferably, the polymer comprises one or more of polyamide, polyester, polypropylene, polylactic acid and polystyrene; the hot-melt fiber comprises low-melting-point polyvinyl acetate/polyvinyl acetate composite fiber with the fiber melting point of 100-145 ℃, polyethylene fiber or ES composite fiber of polyethylene/polypropylene.
The components of the intermediate fiber web are as follows: 12-16% of polyamide 6 (PA 6), 60-70% of anhydrous formic acid, 10-20% of polyacrylonitrile, 5-9% of cosolvent and 3-6% of catalyst.
Preferably, the cosolvent is N, N-dimethylformamide;
preferably, polyamide 6 and N, N-dimethylformamide are analytically pure and have low interfering impurities;
preferably, the anhydrous formic acid has a purity of 99.99%.
Preferably, the catalyst is polyvinylpyrrolidone, has a low melting point, can be melted by heating to 130 ℃ generally, and the main fiber can keep the original shape.
The invention provides a preparation method of a reverse osmosis membrane filter screen support body in the technical scheme, which comprises the following steps:
s1: spinning the thermoplastic polymer by adopting a melt spinning technology to obtain spun-bonded filaments, and carrying out filament dividing and net laying on the spun-bonded filaments to obtain a spun-bonded non-woven material layer serving as a lower-layer fiber web;
s2: spinning a polymer nanofiber membrane on the surface of the lower fiber web by adopting a solution jet spinning method to form a middle fiber web;
s3: spinning a thermoplastic polymer by adopting a melt spinning technology to obtain spun-bonded filaments, and performing filament splitting and net laying on the surfaces of the middle-layer fiber nets to obtain spun-bonded non-woven material layers serving as the middle-layer fiber nets to obtain a layered material;
s4: hot-pressing the obtained layered material by using a hot press to obtain a gray cloth;
s5: preparing finishing liquid, namely placing the hot-pressed gray cloth in a padding device for padding the finishing liquid;
s6: finishing: pre-drying at 100-130 deg.C for 1-3min; baking at 140-150 deg.C for 3-6min; washing with water, washing with cold water for 3-5min, and washing with hot water for 2-4min; drying at 80-100 deg.C to obtain a reverse osmosis membrane filter support;
s7: packaging and coding: winding the reverse osmosis membrane filter support body on a roller made of a paper material, and coding to obtain a finished product roll; recording: and recording the finished product roll and then warehousing.
Preferably, the finishing liquid in the step S5 consists of the following components in parts by weight: 20-30% of polyvinyl acetate, 10-15% of waterborne epoxy curing agent, 8-12% of polyvinyl alcohol and 15-25% of water.
The solution jet spinning in the step S2 comprises the following specific preparation steps:
(1) Weighing raw materials: weighing appropriate amount of polyamide 6, polyacrylonitrile and polyvinylpyrrolidone powder;
(2) Stirring the powder, mixing the raw material powder weighed according to the proportion, putting the mixture into a crushing and stirring tank, continuously crushing and stirring for half an hour, and taking out the mixed raw material;
(3) Preparing a solution, dissolving the mixed powder after crushing and stirring in a proper amount of anhydrous formic acid, and adding a proper amount of N, N-dimethylformamide cosolvent;
(4) Performing hot melting processing, pouring the prepared solution into a hot melting stirrer, heating and stirring at 250 ℃, stirring until the raw materials are completely melted and uniformly mixed, standing to normal temperature, taking out, putting into a double-roller rolling machine, repeatedly rolling, and extruding bubbles;
(5) Preparing spinning, namely putting the uniformly mixed raw material solution into a liquid storage tank, heating at high temperature for drawing, and spraying out the raw material solution from a spinning nozzle to form nano fibers;
(6) The method comprises the following steps of yarn forming, forming the nanofiber into a funnel-shaped nanofiber net with an oriented structure through a collecting device, and gradually winding and shrinking the fibers at the top of the funnel into nanofiber yarns through the drawing action of a winding roller and the twisting action of a rotating shaft and a receiving disc.
Example two
The antimony-free low-melting-point reverse osmosis membrane filter screen support is characterized in that a reverse osmosis membrane filter screen support material is prepared by sequentially arranging an upper layer fiber web, a middle fiber web and a lower layer fiber web from top to bottom through hot pressing treatment; the upper layer fiber web and the lower layer fiber web are spun-bonded non-woven material layers; the spunbond nonwoven layer is made of thermoplastic polymer spunbond filaments; the intermediate web is a polymeric nanofiber film.
The upper layer fiber web is prepared by 70 weight percent of small-diameter polymer and 30 weight percent of hot melt fiber, and the basis weight of the upper layer fiber web is 20g/m 2 ；
The lower layer fiber web is composed of 80-20 wt% of thick-diameter polymer and 20 wt% of hot-melt fiber, and the basis weight of the lower layer fiber web is 30g/m 2 ；
Preferably, the diameter of the large-diameter polymer is 16 μm, the diameter of the small-diameter polyester fiber is 10 μm, and the dispersant is polyethylene oxide.
Preferably, the polymer comprises one or more of polyamide, polyester, polypropylene, polylactic acid and polystyrene; the hot-melt fiber comprises low-melting-point polyvinyl acetate/polyvinyl acetate composite fiber with the fiber melting point of 100-145 ℃, polyethylene fiber or ES composite fiber of polyethylene/polypropylene.
The components of the intermediate fiber web are as follows: 12% of polyamide 6 (PA 6), 60% of anhydrous formic acid, 10% of polyacrylonitrile, 5% of cosolvent and 3% of catalyst. The cosolvent is N, N-dimethylformamide; the polyamide 6 and the N, N-dimethylformamide are analytically pure and have low interfering impurities; the purity of the anhydrous formic acid is 99.99%. The catalyst is polyvinylpyrrolidone, has low melting point, can be melted when being heated to 130 ℃, and the main fiber can keep the original shape.
The preparation method of the reverse osmosis membrane filter screen support comprises the following steps:
s1: spinning the thermoplastic polymer by adopting a melt spinning technology to obtain spun-bonded filaments, and carrying out filament dividing and net laying on the spun-bonded filaments to obtain a spun-bonded non-woven material layer serving as a lower-layer fiber web;
s2: spinning a polymer nanofiber membrane on the surface of the lower fiber web by adopting a solution jet spinning method to form a middle fiber web;
s3: spinning a thermoplastic polymer by adopting a melt spinning technology to obtain spun-bonded filaments, and performing filament splitting and net laying on the surfaces of the middle-layer fiber nets to obtain spun-bonded non-woven material layers serving as the middle-layer fiber nets to obtain a layered material;
s4: hot-pressing the obtained layered material by using a hot press to obtain a gray cloth;
s5: preparing finishing liquid, namely placing the hot-pressed gray cloth in a padding device for padding the finishing liquid;
s6: finishing: pre-baking at 110 deg.C for 2min; baking at 140 deg.C for 4min; washing with water, washing with cold water for 4min, and washing with hot water for 3min; drying at 90 ℃ to obtain a reverse osmosis membrane filtration support body;
s7: packaging and coding: winding the reverse osmosis membrane filter support body on a roller made of a paper material, and coding to obtain a finished product roll; recording: and recording the finished product roll and then warehousing.
Preferably, the finishing liquid in the step S5 consists of the following components in parts by weight: 20% of polyvinyl acetate, 10% of water-based epoxy curing agent, 8% of polyvinyl alcohol and 15% of water.
The solution jet spinning in the step S2 comprises the following specific preparation steps:
the solution jet spinning device for continuously preparing the nanofiber yarns has the working principle that:
the polymer spinning solution flows to a spinning nozzle from a liquid conveying pipe under the action of a feeding pump, is sprayed out from the spinning nozzle to form polymer trickle under the action of solution extrusion pressure and normal-temperature high-speed airflow, and the polymer trickle sprayed by the solution is further stretched and refined under the action of drafting wind of the high-speed airflow and enters a high-temperature spinning box body; the solvent is rapidly volatilized under the high-temperature environment of the box body, the solution trickles and solidifies to form the nano-fibers, and the nano-fibers fall on the receiving net under the action of suction wind to obtain the non-woven nano-fiber felt.
At the start of spinning, one end of a yarn guide is tied to the winding roller and the other end is suspended on the receiving disc through the yarn guide tube for a distance of about 10 cm. The solution is sprayed to generate nano fiber which is firstly received between the yarn guiding disc and the receiving disc, the fiber between the disc and the yarn guiding disc is more and more along with the rotation of the receiving disc, and at a certain moment, the rotating shaft is opened in sequence according to the winding roller, so that the fiber is gradually bunched and twisted into a continuous yarn under the traction force of the winding roller and the twisting force of the yarn guide tube driven by the rotating shaft.
Example three:
referring to fig. 2, the present embodiment provides a solution jet spinning apparatus for a filter screen support of an antimony-free low-melting point reverse osmosis membrane, which includes a liquid storage tank 1, a supply pump 2, a liquid transport pipe 3, a spinneret 4, a hot air plate 5, a spinning box 6, a receiving net 7, normal temperature air 8, a distribution net 9, an air storage tank 10, hot air 11, a heater 12, and a fan 13.
The liquid storage tank 1 is connected with one end of the feeding pump 2, the other end of the feeding pump 2 is connected with one end of the liquid conveying pipe 3, so the other end of the liquid conveying pipe 3 is connected with one end of the spinning nozzle 4, the hot air plate 5 is arranged below the spinning nozzle 4, the spinning box 6 is arranged below the hot air plate 5 and tightly attached to the hot air plate 5, the receiving net 7 is arranged below the inner part of the spinning box 6, one end of the normal temperature air 8 is connected with the other end of the spinning nozzle 4, one end of the distribution net 9 is connected with the other end of the normal temperature air 8, and the gas storage tank 10 is connected with the other end of the distribution net 9.
The embodiments of the present invention are described in detail with reference to the drawings, and the embodiments are implemented on the premise of the technical solution of the present invention, and the detailed embodiments and the specific operation procedures are given, but the scope of the present invention is not limited to the following embodiments, and those skilled in the art can modify and decorate the embodiments without changing the spirit and content of the present invention.
Claims (10)
1. The antimony-free low-melting-point reverse osmosis membrane filter screen support is characterized in that the reverse osmosis membrane filter screen support is prepared by sequentially arranging an upper layer fiber web, a middle fiber web and a lower layer fiber web from top to bottom through hot pressing; the upper layer fiber web and the lower layer fiber web are spun-bonded non-woven material layers; the spunbond nonwoven layer is made of thermoplastic polymer spunbond filaments; the intermediate web is a polymeric nanofiber film.
2. The antimony-free low melt reverse osmosis membrane screen support of claim 1, wherein the upper web is formed from a fine diameter meshThe polymer and the hot melt fiber, wherein the weight percentage and quantitative ratio of the small-diameter polymer to the hot melt fiber are respectively 70% -80%:30% -40% of water and 20g/m 2 -30g/m 2 ：20g/m 2 -30g/m 2 (ii) a The lower layer fiber web consists of a large-diameter polymer and hot-melt fibers, and the weight percentage and quantitative ratio of the large-diameter polymer to the hot-melt fibers are respectively 80% -90%:20% -30%,30g/m 2 -40g/m 2 ：30g/m 2 -40g/m 2 。
3. The antimony-free low melt reverse osmosis membrane screen support of claim 1 wherein the intermediate web comprises the following weight percent ratios: polyamide 6 (PA 6): anhydrous formic acid: polyacrylonitrile: cosolvent: catalyst =12-16%:60-70%:10-20%:5-9%:3 to 6 percent.
4. The antimony-free low-melting reverse osmosis membrane screen support according to claim 2, wherein the diameter of the large-diameter polymer is 12 μm to 22pm, and the diameter of the small-diameter polyester fiber is 7 μm to 17 μm.
5. The antimony-free low-melting reverse osmosis membrane screen support of claim 2, wherein the small-diameter polymer and the large-diameter polymer respectively comprise one or more of polyamide, polyester, polypropylene, polylactic acid and polystyrene; the hot-melt fiber comprises one or more of low-melting-point polyvinyl acetate/polyvinyl acetate composite fiber with the fiber melting point of 100-145 ℃, polyethylene fiber and ES composite fiber of polyethylene/polypropylene.
6. The antimony-free low-melting reverse osmosis membrane screen support of claim 3, wherein the co-solvent is N, N-dimethylformamide; the polyamide 6 is analytically pure N, N-dimethylformamide; the anhydrous formic acid accounts for 99.99 percent; the catalyst is polyvinylpyrrolidone.
7. The preparation method of the antimony-free low-melting-point reverse osmosis membrane filter screen support is characterized by comprising the following steps of:
s1: spinning the thermoplastic polymer of claim 1 using a melt spinning technique to obtain spunbond filaments, dividing the spunbond filaments for layering to obtain a spunbond nonwoven layer as a lower web;
s2: spinning a polymer nanofiber membrane on the surface of the lower layer fiber web by adopting a solution jet spinning method to form a middle layer fiber web;
s3: spinning a thermoplastic polymer by adopting a melt spinning technology to obtain spun-bonded filaments, and performing filament splitting and net laying on the surfaces of the middle-layer fiber nets to obtain spun-bonded non-woven material layers serving as the middle-layer fiber nets to obtain a layered material;
s4: utilizing a hot press to carry out hot pressing on the obtained layered material to obtain a gray cloth;
s5: preparing finishing liquid, namely placing the hot-pressed gray cloth in a padding device for padding the finishing liquid;
s6: finishing: pre-baking at 100-130 deg.C for 1-3min; baking at 140-150 deg.C for 3-6min; washing with water, washing with cold water for 3-5min, and washing with hot water for 2-4min;
drying at 80-100 deg.C to obtain a reverse osmosis membrane filter support;
s7: packaging and coding: winding the reverse osmosis membrane filter support body on a roller made of a paper material, and coding to obtain a finished product roll; recording: and recording the finished product roll and then warehousing.
8. The method for preparing the antimony-free low-melting-point reverse osmosis membrane screen support according to claim 7, wherein the finishing liquid in the step S5 is prepared from polyvinyl acetate: aqueous epoxy curing agent: polyvinyl alcohol: water =20-30%:10-15%:8-12%:15-25% of the composition.
9. The method for preparing the filter screen support of the antimony-free low-melting reverse osmosis membrane according to claim 7, wherein a solution jet spinning device of the filter screen support of the antimony-free low-melting reverse osmosis membrane is further used, and the solution jet spinning device comprises a liquid storage tank 1, a feed pump 2, a liquid conveying pipe 3, a spinning nozzle 4, a hot air plate 5, a spinning box 6, a receiving net 7, normal temperature air 8, a distribution net 9, an air storage tank 10, hot air 11, a heater 12 and a fan 13.
10. The solution jet spinning device of antimony-free low-melting-point reverse osmosis membrane filter screen support according to claim 7, wherein the liquid storage tank 1 is connected to one end of the feed pump 2, the other end of the feed pump 2 is connected to one end of the liquid transport tube 3, so the other end of the liquid transport tube 3 is connected to one end of the spinneret 4, the hot air plate 5 is disposed below the spinneret 4, the spinning box 6 is disposed below the hot air plate 5 and closely attached to the hot air plate 5, the receiving net 7 is disposed below the inside of the spinning box 6, one end of the normal temperature air 8 is connected to the other end of the spinneret 4, one end of the distribution net 9 is connected to the other end of the normal temperature air 8, and the air storage tank 10 is connected to the other end of the distribution net 9.
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