CN116084088A - Waterproof breathable film for building and processing method thereof - Google Patents
Waterproof breathable film for building and processing method thereof Download PDFInfo
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- CN116084088A CN116084088A CN202210976475.9A CN202210976475A CN116084088A CN 116084088 A CN116084088 A CN 116084088A CN 202210976475 A CN202210976475 A CN 202210976475A CN 116084088 A CN116084088 A CN 116084088A
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- 238000003672 processing method Methods 0.000 title abstract description 12
- 238000009987 spinning Methods 0.000 claims abstract description 56
- 238000001816 cooling Methods 0.000 claims abstract description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 26
- 238000010791 quenching Methods 0.000 claims abstract description 25
- 238000010521 absorption reaction Methods 0.000 claims abstract description 24
- 230000000171 quenching effect Effects 0.000 claims abstract description 24
- 239000000945 filler Substances 0.000 claims abstract description 21
- 238000001704 evaporation Methods 0.000 claims abstract description 19
- 230000008020 evaporation Effects 0.000 claims abstract description 18
- 230000003647 oxidation Effects 0.000 claims abstract description 17
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 17
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 16
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 16
- 239000010439 graphite Substances 0.000 claims abstract description 16
- 238000010438 heat treatment Methods 0.000 claims abstract description 12
- 239000006227 byproduct Substances 0.000 claims abstract description 6
- 238000003490 calendering Methods 0.000 claims abstract description 5
- 238000007731 hot pressing Methods 0.000 claims abstract description 5
- 238000000034 method Methods 0.000 claims description 15
- 239000007788 liquid Substances 0.000 claims description 12
- 238000012545 processing Methods 0.000 claims description 7
- 239000007921 spray Substances 0.000 claims description 4
- 238000010276 construction Methods 0.000 claims description 2
- HGUFODBRKLSHSI-UHFFFAOYSA-N 2,3,7,8-tetrachloro-dibenzo-p-dioxin Chemical compound O1C2=CC(Cl)=C(Cl)C=C2OC2=C1C=C(Cl)C(Cl)=C2 HGUFODBRKLSHSI-UHFFFAOYSA-N 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 239000004753 textile Substances 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 54
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 15
- 239000002904 solvent Substances 0.000 description 9
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 description 8
- 229920000642 polymer Polymers 0.000 description 8
- 230000004323 axial length Effects 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 238000001179 sorption measurement Methods 0.000 description 6
- 210000000214 mouth Anatomy 0.000 description 5
- 238000012546 transfer Methods 0.000 description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- IXCSERBJSXMMFS-UHFFFAOYSA-N hydrogen chloride Substances Cl.Cl IXCSERBJSXMMFS-UHFFFAOYSA-N 0.000 description 3
- 229910000041 hydrogen chloride Inorganic materials 0.000 description 3
- 230000003472 neutralizing effect Effects 0.000 description 3
- 238000005507 spraying Methods 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 239000002023 wood Substances 0.000 description 3
- 239000003463 adsorbent Substances 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000000578 dry spinning Methods 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 230000033001 locomotion Effects 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 239000004745 nonwoven fabric Substances 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- VLIDBBNDBSNADN-UHFFFAOYSA-N 1,1-dichloro-2,2-difluoroethane Chemical compound FC(F)C(Cl)Cl VLIDBBNDBSNADN-UHFFFAOYSA-N 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 239000000110 cooling liquid Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000013618 particulate matter Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- -1 polytetrafluoroethylene Polymers 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 230000029058 respiratory gaseous exchange Effects 0.000 description 1
- 238000000935 solvent evaporation Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- CYRMSUTZVYGINF-UHFFFAOYSA-N trichlorofluoromethane Chemical compound FC(Cl)(Cl)Cl CYRMSUTZVYGINF-UHFFFAOYSA-N 0.000 description 1
- 229940029284 trichlorofluoromethane Drugs 0.000 description 1
Images
Classifications
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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
- D04H1/70—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres
- D04H1/72—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres the fibres being randomly arranged
- D04H1/724—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres the fibres being randomly arranged forming webs during fibre formation, e.g. flash-spinning
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/005—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by heat treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1431—Pretreatment by other processes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/18—Absorbing units; Liquid distributors therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
-
- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
- D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
- D04H1/4282—Addition polymers
- D04H1/4291—Olefin series
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Analytical Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Textile Engineering (AREA)
- Thermal Sciences (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
Abstract
The invention belongs to the technical field of textile production, and relates to a processing method of a waterproof breathable film for a building, which comprises the following steps: carrying out flash spinning on the spinning solution, then carrying out lapping on the flash spinning, and carrying out hot-pressing treatment and calendaring treatment to obtain a waterproof breathable film and a byproduct flash tail gas; introducing the flash evaporation tail gas into an oxidation furnace, and heating for more than 2 seconds at the heating temperature of more than 1200 ℃ to obtain crude tail gas; introducing the crude tail gas into a quenching tower, and passing through a cooling pipe with graphite filler inside the quenching towerCooling to obtain intermediate tail gas; the middle tail gas enters an absorption tower through a pipeline to be absorbed and discharged. The waterproof breathable film for building prepared by the technical scheme has the gram weight of 40g/m 2 The above. No leakage in 2 hours under the condition of 1000mm water column, and the water vapor throughput is 1000 g/(m) 2 24 h) or more. The flash evaporation tail gas is subjected to high-temperature rapid oxidation, so that the flash evaporation tail gas is thoroughly oxidized, dioxin is not generated, and the intermediate tail gas is effectively and rapidly cooled.
Description
Technical Field
The invention belongs to the technical field of textile production, relates to a high polymer waterproof material for buildings, and particularly relates to a waterproof breathable film for buildings and a processing method thereof.
Background
The waterproof and breathable film, also called breathing paper, is a novel polymer waterproof material, and the technical requirement of the waterproof and breathable film is much higher than that of a common waterproof material in terms of the manufacturing process; meanwhile, from the quality, the waterproof breathable film also has the functional characteristics which are not possessed by other waterproof materials. The waterproof breathable film is mainly applied to steel structure and wood structure buildings in the building field, and the working principle of the waterproof breathable film is that water particles are very fine in a water vapor state, and can smoothly permeate into capillaries to the other side according to the principle of capillary motion, so that a vapor permeation phenomenon occurs.
Some prior art solutions for preparing nonwoven fabrics by flash evaporation have resolidified polymers into fibers due to the rapid evaporation of solvents. The dry spinning technology adopted by the flash evaporation method is different from the common dry spinning technology, and is mainly characterized in that the flash evaporation technology adopts lower spinning solution viscosity and ejects the spinning solution from a spinning hole at extremely high pressure and speed. Because of the low viscosity and good fluidity of the solution, the liquid filaments solidify in high speed movement to form very fine fiber filaments, which are finally adsorbed onto a web-forming curtain to form a web directly. In the flash evaporation process, a large amount of solvent volatilizes to form polluted tail gas, which can cause harm to the environment.
For example, chinese patent publication No. CN112609334B discloses a flash evaporation nonwoven fabric and a method for preparing the same, in which the tail gas treatment includes transporting solvent vapor generated by solvent evaporation to a lower section of an adsorption tower through a blower, spraying a liquid adsorbent for adsorbing the solvent vapor from an upper section of the adsorption tower and mixing with the solvent vapor in the adsorption tower, discharging the liquid from a bottom of the adsorption tower after the adsorption is completed, and discharging the gas from a top of the adsorption tower.
In the above technical scheme, although the tail gas is mixed and adsorbed by adopting the liquid adsorbent and the solvent vapor, the need of exhausting partial gas which is not completely adsorbed exists finally.
Disclosure of Invention
The invention aims to solve the problems and provides a waterproof and breathable film for building;
another object of the present invention is to provide a method for processing a waterproof breathable film for construction, which aims at the above problems.
The invention creatively provides a processing method of a waterproof and breathable film for a building, which is characterized by comprising the following steps of:
carrying out flash spinning on the spinning solution, then carrying out lapping on the flash spinning, and carrying out hot-pressing treatment and calendaring treatment to obtain a waterproof breathable film and a byproduct flash tail gas;
introducing the flash evaporation tail gas into an oxidation furnace, and heating for more than 2 seconds at the heating temperature of more than 1200 ℃ to obtain crude tail gas;
introducing the crude tail gas into a quenching tower, and cooling by a cooling pipe with graphite filler in the quenching tower to obtain intermediate tail gas;
the middle tail gas enters an absorption tower through a pipeline to be absorbed and discharged.
The flash evaporation tail gas is subjected to high-temperature rapid oxidation, so that the flash evaporation tail gas is thoroughly oxidized, dioxin is not generated, and graphite filler is used as cooling pipe filler, so that the intermediate tail gas is effectively and rapidly cooled, the gas-liquid heat and mass transfer is enhanced, and the tail gas is absorbed while being cooled, so that the outlet temperature is lower than 120 ℃.
In the processing method of the waterproof and breathable film for the building, the filling amount of the graphite filler in the cooling pipe is more than 60% of the total volume of the cooling pipe.
By increasing the graphite filler to more than 60% of the total volume, the cooling efficiency of the cooling pipe to the intermediate tail gas is greatly improved, and the gas-liquid heat and mass transfer is further enhanced.
In the above processing method of the waterproof and breathable film for building, the oxidation furnace is of a U-shaped structure, the top of the oxidation furnace is connected with the top of the quenching tower, and the bottom of the quenching tower is connected with the bottom of the absorption tower, so that the flowing direction of the tail gas is in an arch shape.
The oxidation furnace, the quenching tower and the absorption tower form an arc-shaped tail gas treatment channel so as to ensure the residence time of the tail gas, reasonably utilize the space and optimize the effect of tail gas treatment.
In the above processing method of a waterproof breathable film for a building, the quenching tower and the absorption tower respectively perform in-tower spray circulation with absorption liquid.
The absorption liquid is a warm liquid, and an alkali solution, such as sodium hydroxide solution, can be selected for neutralizing the hydrogen chloride gas in the exhaust gas.
In the processing method of the waterproof and breathable film for the building, the spinning solution is obtained by dissolving a polymer in a spinning solvent, wherein the polymer comprises PE and/or PP, and the spinning solvent comprises one or more than two of dichloromethane, trichlorofluoromethane, 1-dichloro-2, 2-trifluoroethane (HC-123), 1, 2-dichloro-1, 2-trifluoroethane (HC-123 a) and 1, 1-dichloro-2, 2-difluoroethane (HC-132 a).
In the processing method of the waterproof and breathable film for the building, the mass fraction of the polymer in the spinning solution is 8% -16%.
In the processing method of the waterproof breathable film for the building, the spinning temperature of flash spinning is 200-220 ℃, the temperature of hot pressing treatment is 110-115 ℃, and the temperature of calendaring treatment is 110-115 ℃.
By using the components as spinning solution components and using corresponding control conditions, a waterproof breathable film with excellent waterproof and breathable properties can be prepared, and the obtained by-product flash evaporation tail gas can be thoroughly purified by using the tail gas treatment method disclosed by the invention, so that secondary pollutants are not generated.
The waterproof and breathable film for building prepared by the technical scheme further limits the gram weight of the waterproof and breathable film to 40g/m 2 The above. No leakage in the condition of 1000mm water column and no water vapor passing throughThe amount was 1000 g/(m) 2 24 h) or more.
In the waterproof and breathable film for building, the gram weight of the waterproof and breathable film is 50-60 g/m 2 。
In the waterproof and breathable film for building, the gram weight of the waterproof and breathable film is 60-70 g/m 2 。
In the waterproof and breathable film for building, the water vapor throughput of the waterproof and breathable film is 1000-2000 g/(m) 2 ·24h)。
In the waterproof and breathable film for building, the water vapor throughput of the waterproof and breathable film is 2000-3000 g/(m) 2 ·24h)。
The waterproof breathable film can be better suitable for waterproof breathable materials of steel structure and wood structure buildings.
Compared with the prior art, the invention has the advantages that:
1) The flash evaporation tail gas is subjected to high-temperature rapid oxidation, so that the flash evaporation tail gas is thoroughly oxidized, dioxin is not generated, and graphite filler is used as cooling pipe filler, so that the intermediate tail gas is effectively and rapidly cooled, the gas-liquid heat and mass transfer is enhanced, and the tail gas is absorbed while being cooled, so that the outlet temperature is lower than 120 ℃.
2) According to the invention, the graphite filler is added to more than 60% of the total volume, so that the cooling efficiency of the cooling pipe on the intermediate tail gas is greatly improved, the gas-liquid heat and mass transfer is further enhanced, and the tail gas treatment efficiency is improved by matching with the oxidation furnace.
3) According to the invention, specific components are used as spinning solution components, and corresponding control conditions are used, so that a waterproof breathable film with excellent waterproof and breathable properties can be prepared, and the obtained by-product flash evaporation tail gas can be thoroughly purified by using the tail gas treatment method disclosed by the invention, so that secondary pollutants are not generated, and sustainable development is realized.
4) The waterproof breathable film can be better suitable for waterproof breathable materials of steel structure and wood structure buildings.
Drawings
Fig. 1 is a schematic diagram of a tail gas treatment device in a processing process of a waterproof and breathable film for a building.
Fig. 2 is a schematic structural view of a nozzle according to the present invention.
Fig. 3 is a schematic structural view of another nozzle according to the present invention.
In the figure: oxidizing furnace 1, quench tower 2, graphite packing 201, cooling tube 202, absorber 3, nozzle body 4, spinning solution inlet chamber 420, conical section 421, circular arc section 422, spinning nozzle 430, and bell mouth 440.
Detailed Description
Further illustrated by the following specific examples;
in the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than as described herein, and therefore the present invention is not limited to the specific embodiments disclosed below.
Example 1
As shown in fig. 1, the tail gas treatment equipment in the waterproof and breathable film processing process for the building is characterized in that the oxidation furnace 1 is of a U-shaped structure, the top of the oxidation furnace 1 is connected with the top of the quenching tower 2, and the bottom of the quenching tower 2 is connected with the bottom of the absorption tower 3, so that the flowing direction of the tail gas is in an arch shape.
The inner surface of the quenching tower 2 is coated with a polytetrafluoroethylene resin layer. Cooling pipes 202 are longitudinally arranged inside the quenching tower 2, and the cooling pipes 202 are filled with graphite filler 201 accounting for 60% of the total volume of the cooling pipes 202. The bottom of the quenching tower 2 contains a sodium hydroxide warm solution, the warm solution is 30-50 ℃, and the sodium hydroxide warm solution is sprayed downwards from the top and the bottom of the cooling pipe 202 through a circulating pump to form the spray circulation in the quenching tower 2. The absorption tower 3 is internally provided with absorption filler, the absorption filler is specifically graphite filler, sodium hydroxide solution is contained at the bottom of the absorption filler, and sodium hydroxide warm solution is sprayed downwards from the top of the absorption filler of the absorption tower through a circulating pump to form spray circulation in the absorption tower 3.
The processing method of the waterproof and breathable film for the building comprises the following steps of:
step 1) taking PP as a polymer and dichloromethane as a spinning solvent to prepare a spinning solution, wherein the mass fraction of the polymer in the spinning solution is 8%. Flash spinning is carried out on the spinning solution, the spinning temperature of the flash spinning is 200 ℃, then the flash spinning is paved, and a waterproof breathable film and a byproduct flash tail gas are obtained through 110 ℃ hot pressing treatment and 110 ℃ calendaring treatment;
step 2), introducing the flash evaporation tail gas into an oxidation furnace 1, and heating for 2 seconds at the temperature of 1200 ℃ to obtain crude tail gas;
step 3) introducing the crude tail gas into a quenching tower 2, circulating the crude tail gas in a cooling pipe 202 with graphite filler 201 inside the quenching tower 2 through cooling liquid, cooling the crude tail gas to obtain intermediate tail gas, and neutralizing hydrogen chloride gas in a spraying circulation in the quenching tower 2;
and 4) enabling the intermediate tail gas to enter an absorption tower 3 through a pipeline, carrying out absorption treatment through an absorption filler, and further neutralizing hydrogen chloride gas in the spraying circulation in the absorption tower 3 to obtain the tail gas capable of being discharged.
The gram weight of the obtained waterproof breathable film is 50g/m 2 The water vapor throughput was 1000 g/(m) without leakage in 2 hours under the condition of 1000mm water column 2 24 h) or more.
Example 2
This embodiment is the same as embodiment 1 except that:
step 2) heating to 1250 ℃ to obtain crude tail gas.
Example 3
This embodiment is the same as embodiment 1 except that:
and 2) heating to 1300 ℃ to obtain crude tail gas.
The nozzle for spinning in the flash spinning process in the above embodiments 1-3 is shown in fig. 2, and comprises a nozzle body 4, wherein the nozzle body 4 is provided with a spinning solution inlet cavity 420 and a spinning nozzle 430, the spinning solution inlet cavity 420 and the spinning nozzle 430 are axially opposite, the spinning solution inlet cavity 420 and the spinning nozzle 430 are mutually communicated and penetrate through two ends of the nozzle body 4, the spinning solution inlet cavity 420 is provided with a conical section 421 with gradually reduced outer diameter to inner diameter and a circular arc section 422 connected with the inner end of the conical section 421, the diameter of the inner end of the spinning nozzle 430 is smaller than the minimum diameter of the conical section 421, and the inner end of the conical section 421 is in transitional connection with the inner end of the spinning nozzle 430 through the circular arc section 422. The outlet of the outer end of the spinning nozzle 430 is connected with a flare 440 with a diameter expanding from inside to outside.
The angle θ between the two side walls of the longitudinal section of the conical section 421 is 15 °. The angle α between the two side walls of the longitudinal section of the flare 440 is 85 °.
The minimum diameter D1 of the conical section 421 is 0.8cm, the maximum diameter D2 of the conical section 421 is 1.0cm, the axial length L1 of the dope inlet chamber 420 is 0.8cm, the diameter D0 of the spinneret 430 is 0.16cm, the axial length L2 of the spinneret 430 is 0.2cm, and the axial length L3 of the bell mouth 440 is 0.35cm.
Through this nozzle, can set up convex guide structure through spinning solution oral cavity and spinneret orifice hookup location, avoid the dead angle under the circumstances of guaranteeing the spinneret speed, avoid the flaw that leads to because piece and reunion phenomenon to make even ventilated membrane, improved the gas permeability of ventilated membrane.
Example 4
This embodiment is the same as embodiment 1 except that:
the nozzle for spinning in the flash spinning process is shown in fig. 3, and comprises a nozzle body 4a, wherein the nozzle body 4a is provided with a spinning solution inlet cavity 420a and a spinning nozzle 430a, the spinning solution inlet cavity 420a and the spinning nozzle 430a are axially opposite, the spinning solution inlet cavity 420a and the spinning nozzle 430a are mutually communicated and penetrate through two ends of the nozzle body 4a, the spinning solution inlet cavity 420a is a conical section 421a with gradually reduced diameter from outside to inside, the diameter of the inner end of the spinning nozzle 430a is smaller than the minimum diameter of the conical section 421a, and the inner end of the conical section 421a is directly connected with the inner end of the spinning nozzle 430. The outlet of the outer end of the spinning nozzle 430a is connected with a flare 440a having a diameter enlarged from inside to outside.
The angle θ between the two side walls of the longitudinal section of the conical section 421a is 15 °. The angle α between the two side walls of the longitudinal section of the flare 440a is 85 °.
The maximum diameter D2 of the conical section 421a is 1.0cm, the axial length L1 of the dope inlet chamber 420a is 0.8cm, the diameter D0 of the spinneret 430a is 0.16cm, the axial length L2 of the spinneret 430a is 0.2cm, and the axial length L3 of the bell mouth 440a is 0.35cm.
The breathable films prepared in examples 1-4 were used for the water vapor throughput test, respectively.
Table 1 product performance test table of examples
The results show that the breathable films prepared in examples 1-3 of the present invention have significantly higher water vapor throughput than example 4, indicating that the nozzles of examples 1-3 of the present invention achieve better breathable results.
Comparative example 1
This comparative example is identical to example 1, except that:
step 2) heating to 1100 ℃ to obtain crude tail gas.
Comparative example 2
This comparative example is identical to example 1, except that:
step 2) introducing the flash tail gas into an oxidation furnace 1 and heating for 1 second.
Comparative example 3
This comparative example is identical to example 1, except that:
the cooling tube 202 is filled with graphite filler 201 accounting for 50% of the total volume of the cooling tube 202.
Table 2 tail gas test table at different heating temperatures
The result shows that the method adopts the temperature of more than 1200 ℃ and stays for 2s, so that the flash evaporation tail gas can be thoroughly oxidized, and the DCM concentration, the dioxin concentration and the particulate matter concentration in the tail gas are greatly reduced.
Table 3 exhaust cooling effect test table at inlet and outlet of exhaust treatment equipment
The results show that when the volume of the graphite filler in the cooling pipe is higher than 60%, the cooling effect in the quenching tower can be effectively improved.
The specific embodiments described herein are offered by way of example only to illustrate the spirit of the invention. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions thereof without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.
Although terms such as the oxidation furnace 1, the quenching tower 2, the graphite packing 201, the cooling pipe 202, the absorption tower 3, the nozzle body 4, the dope inlet chamber 420, the cone section 421, the circular arc section 422, the spinning nozzle 430, the bell mouth 440, etc. are used more herein. These terms are only used to more conveniently describe and explain the nature of the invention and should be construed in a manner consistent with their spirit and scope.
Claims (10)
1. A waterproof breathable film, characterized in that the gram weight of the waterproof breathable film is 40g/m 2 The above; no leakage occurs within 2 hours under the condition of 1000mm water column; the water vapor throughput was 1000 g/(m) 2 24 h) or more.
2. A water-resistant breathable film according to claim 1, characterized in that the gram weight of the water-resistant breathable film is 50-60 g/m 2 。
3. A water-resistant breathable film according to claim 1, characterized in that the gram weight of the water-resistant breathable film is 60-70 g/m 2 。
4. A water-resistant breathable film according to claim 1, characterized in that the gram weight of the water-resistant breathable film is 70-80 g/m 2 。
5. A water-resistant breathable film according to claim 1, characterized in that the water vapor throughput of the water-resistant breathable film is 1000-2000 g/(m) 2 ·24h)。
6. A water-resistant breathable film according to claim 1, characterized in that the water vapor throughput of the water-resistant breathable film is 2000-3000 g/(m) 2 ·24h)。
7. A method of processing a waterproof and breathable film for construction according to any one of claims 1 to 6, comprising the steps of:
carrying out flash spinning on the spinning solution, then carrying out lapping on the flash spinning, and carrying out hot-pressing treatment and calendaring treatment to obtain a waterproof breathable film and a byproduct flash tail gas;
introducing the flash evaporation tail gas into an oxidation furnace (1) and heating for more than 2 seconds, wherein the heating temperature is more than 1200 ℃ to obtain crude tail gas;
introducing the crude tail gas into a quenching tower (2), and cooling by a cooling pipe (202) with graphite filler (201) in the quenching tower (2) to obtain intermediate tail gas;
the middle tail gas enters an absorption tower (3) through a pipeline to be absorbed and discharged.
8. The method for processing the waterproof and breathable film for the building according to claim 7, wherein the method comprises the following steps of: the filling amount of the graphite filler (201) in the cooling pipe (202) is more than 60% of the total volume of the cooling pipe (202).
9. The method for processing the waterproof and breathable film for the building according to claim 7, wherein the method comprises the following steps of: the oxidation furnace (1) is of a U-shaped structure, the top of the oxidation furnace (1) is connected with the top of the quenching tower (2), and the bottom of the quenching tower (2) is connected with the bottom of the absorption tower (3), so that the flow direction of tail gas is in a shape of an arc.
10. The method for processing the waterproof and breathable film for the building according to claim 7, wherein the method comprises the following steps of: the quenching tower (2) and the absorption tower (3) are respectively in spray circulation with absorption liquid in the tower.
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