CN116747609A - High-temperature-resistant anti-corrosion flame-retardant filter material and preparation method and application thereof - Google Patents
High-temperature-resistant anti-corrosion flame-retardant filter material and preparation method and application thereof Download PDFInfo
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- CN116747609A CN116747609A CN202310656388.XA CN202310656388A CN116747609A CN 116747609 A CN116747609 A CN 116747609A CN 202310656388 A CN202310656388 A CN 202310656388A CN 116747609 A CN116747609 A CN 116747609A
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- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 title claims abstract description 99
- 239000003063 flame retardant Substances 0.000 title claims abstract description 99
- 239000000463 material Substances 0.000 title claims abstract description 84
- 238000005260 corrosion Methods 0.000 title claims abstract description 64
- 238000002360 preparation method Methods 0.000 title abstract description 11
- 239000000835 fiber Substances 0.000 claims abstract description 94
- 239000003365 glass fiber Substances 0.000 claims abstract description 70
- 239000004810 polytetrafluoroethylene Substances 0.000 claims abstract description 56
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims abstract description 56
- 239000004744 fabric Substances 0.000 claims abstract description 54
- -1 polytetrafluoroethylene Polymers 0.000 claims abstract description 30
- 239000004642 Polyimide Substances 0.000 claims abstract description 23
- 229920001721 polyimide Polymers 0.000 claims abstract description 23
- 229920000049 Carbon (fiber) Polymers 0.000 claims abstract description 18
- 239000004917 carbon fiber Substances 0.000 claims abstract description 18
- 230000007797 corrosion Effects 0.000 claims abstract description 18
- 239000000839 emulsion Substances 0.000 claims abstract description 17
- 238000002156 mixing Methods 0.000 claims abstract description 13
- 238000009960 carding Methods 0.000 claims abstract description 9
- 239000007888 film coating Substances 0.000 claims abstract description 9
- 238000009501 film coating Methods 0.000 claims abstract description 9
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000002131 composite material Substances 0.000 claims description 28
- 238000000034 method Methods 0.000 claims description 6
- 238000005520 cutting process Methods 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 4
- 238000009998 heat setting Methods 0.000 claims description 4
- 238000009958 sewing Methods 0.000 claims description 4
- 238000009999 singeing Methods 0.000 claims description 4
- 239000000428 dust Substances 0.000 abstract description 7
- 239000011148 porous material Substances 0.000 abstract description 6
- 239000002585 base Substances 0.000 description 37
- 238000001914 filtration Methods 0.000 description 14
- 230000000052 comparative effect Effects 0.000 description 12
- 239000007789 gas Substances 0.000 description 11
- 239000002253 acid Substances 0.000 description 10
- 239000003513 alkali Substances 0.000 description 10
- 230000000694 effects Effects 0.000 description 8
- 239000011248 coating agent Substances 0.000 description 7
- 238000000576 coating method Methods 0.000 description 7
- 238000005530 etching Methods 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 241000282414 Homo sapiens Species 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
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- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000005191 phase separation Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 239000004753 textile Substances 0.000 description 1
Classifications
-
- 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
- B01D39/20—Other self-supporting filtering material ; Other filtering material of inorganic material, e.g. asbestos paper, metallic filtering material of non-woven wires
- B01D39/2003—Glass or glassy material
- B01D39/2017—Glass or glassy material the material being filamentary or fibrous
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D39/00—Filtering material for liquid or gaseous fluids
- B01D39/14—Other self-supporting filtering material ; Other filtering material
- B01D39/16—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres
- B01D39/1607—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous
-
- 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
- B01D39/20—Other self-supporting filtering material ; Other filtering material of inorganic material, e.g. asbestos paper, metallic filtering material of non-woven wires
- B01D39/2055—Carbonaceous material
- B01D39/2065—Carbonaceous material the material being fibrous
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/0001—Making filtering elements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/0084—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours provided with safety means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/0084—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours provided with safety means
- B01D46/0091—Including arrangements for environmental or personal protection
- B01D46/0093—Including arrangements for environmental or personal protection against fire or explosion
Abstract
The application discloses a high-temperature-resistant anti-corrosion flame-retardant filter material, a preparation method and application thereof, wherein the high-temperature-resistant anti-corrosion flame-retardant filter material comprises glass fiber base cloth and flame-retardant fibers, the glass fiber base cloth comprises alkali-free glass fibers, polyimide fibers and polytetrafluoroethylene fibers, and the high-temperature-resistant anti-corrosion flame-retardant filter material is prepared by carding and forming a net after loosening and mixing; the glass fiber base cloth and the flame-retardant fiber are combined together through needling by a needling machine and then are subjected to PTFE emulsion permeation type film coating treatment; the carbon fiber accounts for not more than 20% of the total weight of the high-temperature-resistant corrosion-resistant flame-retardant filter material. The high-temperature-resistant anti-corrosion flame-retardant filter material comprises alkali-free glass fibers, polyimide fibers, polytetrafluoroethylene fibers and flame-retardant fibers; firstly, alkali-free glass fibers, polyimide fibers and polytetrafluoroethylene fibers are subjected to opening mixing and carding to form a net, so that glass fiber base cloth is prepared, and then flame-retardant fibers are combined in a needling mode. The flame-retardant fiber is combined with the glass fiber base cloth in a needling mode, so that a plurality of pores appear on the surface of the flame-retardant fiber, the porosity is improved, the resistance is small, and the dust removal efficiency exceeds that of the fabric filter material.
Description
Technical Field
The application relates to the field of filter materials, in particular to a high-temperature-resistant anti-corrosion flame-retardant filter material, and a preparation method and application thereof.
Background
With the continuous development of industry, the pollution sources of various kinds of dust are inevitably increased, and coal-fired boilers, cement kilns, steel blast furnaces, garbage incinerators and the like can generate gas accompanied with dust, high temperature and corrosiveness in the operation process, so that the smoke dust is one of the atmospheric pollution sources and forms a great threat to the health of human beings. There are two main classes of textile materials currently used for air and gas filtration, i.e. solid/gas phase separation: one type is woven cloth, the other type is non-woven cloth, the using amount of needled cloth is the largest, and the materials are in a three-dimensional structure, have small pores and large porosity and high filtering efficiency, so that the materials are increasingly widely used in recent years.
However, industrial high temperature tail gases mostly contain large amounts of corrosive gases, such as H 2 SO 3 ，H 2 SO 4 、H 2 S and the like, particularly when the temperature of the tail gas exceeds 200 ℃, the corrosiveness of the tail gas on a filtering material is aggravated, so that the problems of incomplete filtering of gas and impurities with high sulfur content, poor acid and alkali resistance, unsatisfactory deep filtering effect, easy blocking and reduction of the service life of equipment exist in the prior art, the requirement of high-temperature dust filtering with complex environment cannot be met, and the application of the tail gas is greatly limited.
Disclosure of Invention
The application aims to provide a high-temperature-resistant anti-corrosion flame-retardant filter material and a preparation method thereof, so as to solve the problem that the acid and alkali resistance of the filter material is poor in a high-temperature environment.
To achieve the purpose, the application adopts the following technical scheme:
the application provides a high-temperature-resistant anti-corrosion flame-retardant filter material, which comprises glass fiber base cloth and flame-retardant fibers, wherein the glass fiber base cloth comprises alkali-free glass fibers, polyimide fibers and polytetrafluoroethylene fibers, and is prepared by carding after opening and mixing; the flame-retardant fiber comprises one or two of a pre-oxidized fiber and a carbon fiber; the glass fiber base cloth and the flame-retardant fiber are combined together through needling by a needling machine and then are subjected to PTFE emulsion permeation type film coating treatment;
the high-temperature-resistant anti-corrosion flame-retardant filter material comprises carbon fibers, wherein the carbon fibers account for not more than 20% of the whole high-temperature-resistant anti-corrosion flame-retardant filter material in percentage by weight.
In the high-temperature-resistant anti-corrosion flame-retardant filter material, the high-temperature-resistant anti-corrosion flame-retardant filter material comprises the following components in percentage by weight:
in the high-temperature-resistant corrosion-resistant flame-retardant filter material, the weight per unit area of the glass fiber base cloth is 300g/m 2 。
The application provides a preparation method of a high-temperature-resistant anti-corrosion flame-retardant filter material, which is used for preparing the high-temperature-resistant anti-corrosion flame-retardant filter material and comprises the following steps:
according to the proportion, the alkali-free glass fiber, polyimide fiber and polytetrafluoroethylene fiber are subjected to loosening and mixing and then are carded into a net, so that glass fiber base cloth is prepared;
according to the proportion, the flame-retardant fibers are paved on the upper surface and the lower surface of the glass fiber base cloth, and are combined together by needling with a needling machine to obtain a composite filter felt;
singeing the composite filter felt;
immersing the composite filter felt in PTFE emulsion to obtain a composite filter felt mixed with PTFE emulsion;
performing film coating treatment on the composite filter felt mixed with the PTFE emulsion, and performing heat setting to ensure that the PTFE film is wrapped on the composite filter felt;
and carrying out digital printing on the composite filter felt wrapped with the PTFE film, drying, and cutting and sewing to obtain the high-temperature-resistant anti-corrosion flame-retardant filter material.
In the preparation method of the high-temperature-resistant corrosion-resistant flame-retardant filter material, the needling depth is 2-15 mm, and the needling density is 200-1000 needles/cm 2 The thickness of the glass fiber base cloth is 0.5-2.0 mm.
The application also provides application of the high-temperature-resistant anti-corrosion flame-retardant filter material in an industrial high-temperature tail gas treatment device as a filter component.
One technical scheme of the application has the following beneficial effects:
the high-temperature-resistant anti-corrosion flame-retardant filter material comprises alkali-free glass fibers, polyimide fibers, polytetrafluoroethylene fibers and flame-retardant fibers; firstly, alkali-free glass fibers, polyimide fibers and polytetrafluoroethylene fibers are subjected to opening mixing and carding to form a net, so that glass fiber base cloth is manufactured, and then flame-retardant fibers are combined together in a needling mode. Because the flame-retardant fiber is combined with the glass fiber base cloth in a needling mode, a plurality of pores generated by needling appear on the surface of the glass fiber base cloth, the porosity is improved, the resistance is small, and the dust removal efficiency exceeds that of the fabric filter material.
Detailed Description
The technical scheme of the application is further described by the following specific embodiments. The present application is described more fully below in order to facilitate an understanding of the present application. This application may be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
The examples are not to be construed as limiting the specific techniques or conditions described in the literature in this field or as per the specifications of the product. The reagents or apparatus used were conventional products commercially available without the manufacturer's attention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
The application provides a high-temperature-resistant anti-corrosion flame-retardant filter material, which comprises glass fiber base cloth and flame-retardant fibers, wherein the glass fiber base cloth comprises alkali-free glass fibers, polyimide fibers and polytetrafluoroethylene fibers, and is prepared by carding after opening and mixing; the flame-retardant fiber comprises one or two of a pre-oxidized fiber and a carbon fiber; the glass fiber base cloth and the flame-retardant fiber are combined together through needling by a needling machine and then are subjected to PTFE emulsion permeation type film coating treatment;
the high-temperature-resistant anti-corrosion flame-retardant filter material comprises carbon fibers, wherein the carbon fibers account for not more than 20% of the whole high-temperature-resistant anti-corrosion flame-retardant filter material in percentage by weight.
The high-temperature-resistant anti-corrosion flame-retardant filter material comprises alkali-free glass fibers, polyimide fibers, polytetrafluoroethylene fibers and flame-retardant fibers; firstly, alkali-free glass fibers, polyimide fibers and polytetrafluoroethylene fibers are subjected to opening mixing and carding to form a net, so that glass fiber base cloth is manufactured, and then flame-retardant fibers are combined together in a needling mode. Because the flame-retardant fiber is combined with the glass fiber base cloth in a needling mode, a plurality of pores generated by needling appear on the surface of the glass fiber base cloth, the porosity is improved, the resistance is small, and the dust removal efficiency exceeds that of the fabric filter material.
The flame-retardant fiber comprises pre-oxidized fiber and carbon fiber, if the pre-oxidized fiber and the carbon fiber are combined with alkali-free glass fiber, polyimide fiber and polytetrafluoroethylene fiber for opening mixing, the density of the high-temperature-resistant corrosion-resistant flame-retardant filter material is high, the whole filter material is not easy to be fluffy, and the filtering effect is affected; the needling mode is selected, the glass fiber base cloth is in a non-directional three-dimensional structure, the internal structure of the fiber layer is in a zigzag path, the pore size is small, the porosity is high, the microporosity and the filtering precision of the filter material are further improved, and the stiffness of the filter material is enhanced. The flame-retardant fibers penetrate into the glass fiber base cloth through needling, so that the surface of the filter material can be flame-retardant, and the polyimide fibers in the glass fiber base cloth are matched, so that the overall flame-retardant effect of the high-temperature-resistant corrosion-resistant flame-retardant filter material is improved.
The polyimide fiber has high temperature resistance and flame retardance, and can be combined with alkali-free glass fiber and polytetrafluoroethylene fiber to effectively improve the acid-base resistance and the folding resistance of the glass fiber base cloth and further improve the high temperature performance of the glass fiber base cloth.
The high-temperature-resistant anti-corrosion flame-retardant filter material is also subjected to PTFE emulsion permeation type film coating treatment, PTFE is polytetrafluoroethylene, and the characteristics of acid and alkali resistance, oxidation resistance, high temperature resistance, weather resistance, high lubrication, non-adhesion and non-toxic are utilized to protect the filter material from acid and alkali corrosion, further hydrolysis can be prevented, any resistance of the filter material can not be increased, and the treated high-temperature-resistant anti-corrosion flame-retardant filter material can be used for a long time in a high-temperature high-corrosion state, can completely meet various complex working conditions, and has long service life.
In the specific embodiment of the application, the carbon fiber accounts for not more than 20% of the weight of the whole high-temperature-resistant anti-corrosion flame-retardant filter material; when the proportion of the carbon fibers exceeds 20%, the flame retardant effect is not obviously improved, the needling process of the carbon fibers is longer, and the fibers of the glass fiber base cloth are more easily damaged in the needling process; meanwhile, the proportion of the carbon fibers is increased, the proportion of other components in the high-temperature-resistant anti-corrosion flame-retardant filter material can be reduced, and the filtering effect of the high-temperature-resistant anti-corrosion flame-retardant filter material is reduced.
Specifically, the high-temperature-resistant anti-corrosion flame-retardant filter material comprises the following components in percentage by weight:
in a specific embodiment of the application, the high-temperature-resistant anti-corrosion flame-retardant filter material comprises 60% alkali-free glass fiber, 20% pre-oxidized fiber, 10% polyimide fiber and 10% polytetrafluoroethylene fiber, and by adopting the components, the polytetrafluoroethylene fiber is contained in the glass fiber base cloth, so that the integral bonding strength between the polytetrafluoroethylene coating and the filter material is improved, the falling-off speed of the polytetrafluoroethylene coating is delayed, and the service life of the filter material is prolonged.
When the filter material is coated with the corrosion-resistant coating, the overall bonding strength between the polytetrafluoroethylene coating and the filter material is not high, the elongation resistance of the coating is poor, and the polytetrafluoroethylene coating is accelerated to fall off, so that the overall corrosion resistance and the service life are affected. Therefore, the glass fiber base cloth adopts polytetrafluoroethylene fibers to enhance the integral bonding strength between the polytetrafluoroethylene coating and the filter material.
In one embodiment of the application, the glass fiber base cloth has a weight per unit area of 300g/m 2 。
The application also provides a preparation method of the high-temperature-resistant anti-corrosion flame-retardant filter material, which is used for preparing the high-temperature-resistant anti-corrosion flame-retardant filter material and comprises the following steps:
according to the proportion, the alkali-free glass fiber, polyimide fiber and polytetrafluoroethylene fiber are subjected to loosening and mixing and then are carded into a net, so that glass fiber base cloth is prepared;
according to the proportion, the flame-retardant fibers are paved on the upper surface and the lower surface of the glass fiber base cloth, and are combined together by needling with a needling machine to obtain a composite filter felt;
singeing the composite filter felt;
immersing the composite filter felt in PTFE emulsion to obtain a composite filter felt mixed with PTFE emulsion;
performing film coating treatment on the composite filter felt mixed with the PTFE emulsion, and performing heat setting to ensure that the PTFE film is wrapped on the composite filter felt;
and carrying out digital printing on the composite filter felt wrapped with the PTFE film, drying, and cutting and sewing to obtain the high-temperature-resistant anti-corrosion flame-retardant filter material.
By adopting the preparation method, the glass fiber base cloth is in a non-directional three-dimensional structure, the internal structure of the fiber layer is in a zigzag path, the pore size is small, the porosity is high, the microporosity and the filtering precision of the filter material are improved, and the stiffness of the filter material is enhanced.
Specifically, the needling depth is 2-15 mm, and the needling density is 200-1000 needles/cm 2 The thickness of the glass fiber base cloth is 0.5-2.0 mm.
In a specific embodiment of the application, the thickness of the glass fiber base cloth is 0.5-2.0 mm, so that the thickness of the high-temperature-resistant corrosion-resistant flame-retardant filter material is thicker, and the optional range of the needling depth is wider. By adopting the needling depth and needling density, the high-temperature-resistant corrosion-resistant flame-retardant filter material can be fluffier.
The application also provides application of the high-temperature-resistant anti-corrosion flame-retardant filter material in an industrial high-temperature tail gas treatment device as a filter component.
Example group A
A preparation method of a high-temperature-resistant anti-corrosion flame-retardant filter material is used for preparing the high-temperature-resistant anti-corrosion flame-retardant filter material and comprises the following steps:
according to the proportion in the table 1, the alkali-free glass fiber, polyimide fiber and polytetrafluoroethylene fiber are subjected to opening mixing and then carding to form a net, so as to prepare glass fiber base cloth;
according to the proportion in the table 1, the flame-retardant fibers are paved on the upper surface and the lower surface of the glass fiber base cloth, and are needled and combined together by a needling machine to obtain a composite filter felt;
singeing the composite filter felt;
immersing the composite filter felt in PTFE emulsion to obtain a composite filter felt mixed with PTFE emulsion;
performing film coating treatment on the composite filter felt mixed with the PTFE emulsion, and performing heat setting to ensure that the PTFE film is wrapped on the composite filter felt;
and carrying out digital printing on the composite filter felt wrapped with the PTFE film, drying, and cutting and sewing to obtain the high-temperature-resistant anti-corrosion flame-retardant filter material.
TABLE 1 component proportions of high temperature resistant anticorrosion flame retardant filter materials
| Component (%) | Example 1 | Example 2 | Example 3 |
| Alkali-free glass fiber | 62 | 60 | 65 |
| Polyimide fiber | 8 | 10 | 12 |
| Polytetrafluoroethylene fiber | 12 | 10 | 8 |
| Flame retardant fiber | 18 | 20 | 15 |
Wherein the weight per unit area of the glass fiber base cloth is 300g/m 2 . The flame retardant fiber of example 1 is a carbon fiber; the flame retardant fiber of example 2 is a pre-oxidized fiber; the flame retardant fiber of example 3 was a pre-oxidized fiber. The needling depth of example 1 was 2mm and the needling density was 1000 needles/cm 2 The thickness of the glass fiber base cloth was 0.5mm, the needling depth of example 2 was 10mm, and the needling density was 800 needles/cm 2 The thickness of the glass fiber base cloth was 1.5mm, the needling depth of example 3 was 15mm, and the needling density was 200 needles/cm 2 The thickness of the glass fiber base cloth is 2.0mm.
Comparative example 1
The composition of comparative example 1 was the same as that of example 2 except that the high temperature resistant, corrosion resistant and flame retardant filter material was prepared by carding a web after the alkali-free glass fiber, polyimide fiber, polytetrafluoroethylene fiber and flame retardant fiber were loosely mixed.
Comparative example 2
The preparation method of comparative example 2 was the same as that of example group a, and the components of comparative example 2 were 50% alkali-free glass fiber, 35% pre-oxidized fiber, 7% polyimide fiber and 8% polytetrafluoroethylene fiber.
According to GB/T14656-2009 standard, vertical burning tests are carried out on the high-temperature-resistant anti-corrosion flame-retardant filter materials prepared in examples 1-3 and comparative examples 1 and 2 respectively; the high temperature resistant, corrosion resistant and flame retardant filter materials prepared in examples 1 to 3 and comparative examples 1 and 2 were tested for initial resistance, filtration efficiency and acid and alkali resistance according to the HJ/T324-2006 standard. The acid and alkali resistance comprises an acid resistance test and an alkali resistance test, wherein the acid resistance test is the strength retention rate after 24 hours of acid etching at 85 ℃, and the alkali resistance test is the strength retention rate after 24 hours of alkali etching at 85 ℃. The test results are shown in Table 2.
TABLE 2 test results
| Test item | Example 1 | Example 5 | Example 3 | Comparative example 1 | Comparative example 2 |
| Combustion time(s) | 0 | 0 | 0 | 0 | 0 |
| Initial resistance (Pa) | 54.21 | 53.24 | 55.86 | 69.21 | 65.63 |
| Filtration efficiency (%) | 99.54 | 99.24 | 99.43 | 95.11 | 96.18 |
| Acid resistance | 61 | 59 | 63 | 60 | 61 |
| Alkali resistance | 59 | 60 | 58 | 61 | 59 |
According to the test results of examples 1-3 and comparative example 1, the combination of the pre-oxidized fiber and the carbon fiber with the alkali-free glass fiber, the polyimide fiber and the polytetrafluoroethylene fiber for open mixing can result in higher density of the high-temperature-resistant, corrosion-resistant and flame-retardant filter material, and the whole filter material is not easy to be fluffy, so that the filtering effect is affected.
According to the test results of examples 1-3 and comparative example 2, the flame retardant effect of comparative example 2 is not obviously improved, and the proportion of flame retardant fibers is too high, so that the proportion of other components in the high-temperature-resistant, corrosion-resistant and flame-retardant filter material can be reduced, and the filtering effect of the high-temperature-resistant, corrosion-resistant and flame-retardant filter material is reduced.
The technical principle of the present application is described above in connection with the specific embodiments. The description is made for the purpose of illustrating the general principles of the application and should not be taken in any way as limiting the scope of the application. Other embodiments of the application will occur to those skilled in the art from consideration of this specification without the exercise of inventive faculty, and such equivalent modifications and alternatives are intended to be included within the scope of the application as defined in the claims.
Claims (6)
1. The high-temperature-resistant anti-corrosion flame-retardant filter material is characterized by comprising glass fiber base cloth and flame-retardant fibers, wherein the glass fiber base cloth comprises alkali-free glass fibers, polyimide fibers and polytetrafluoroethylene fibers, and is prepared by carding after opening and mixing; the flame-retardant fiber comprises one or two of a pre-oxidized fiber and a carbon fiber; the glass fiber base cloth and the flame-retardant fiber are combined together through needling by a needling machine and then are subjected to PTFE emulsion permeation type film coating treatment;
the high-temperature-resistant anti-corrosion flame-retardant filter material comprises carbon fibers, wherein the carbon fibers account for not more than 20% of the whole high-temperature-resistant anti-corrosion flame-retardant filter material in percentage by weight.
2. The high-temperature-resistant anti-corrosion flame-retardant filter material according to claim 1, wherein the high-temperature-resistant anti-corrosion flame-retardant filter material comprises, by weight:
60 to 65 percent of alkali-free glass fiber
8 to 12 percent of polyimide fiber
8 to 12 percent of polytetrafluoroethylene fiber
15-20% of flame-retardant fiber.
3. The high-temperature-resistant corrosion-resistant flame-retardant filter material according to claim 1, wherein the glass fiber base cloth has a weight per unit area of 300g/m 2 。
4. A method for preparing the high-temperature-resistant anti-corrosion flame-retardant filter material, which is used for preparing the high-temperature-resistant anti-corrosion flame-retardant filter material as claimed in any one of claims 1 to 3, and is characterized by comprising the following steps:
according to the proportion, the alkali-free glass fiber, polyimide fiber and polytetrafluoroethylene fiber are subjected to loosening and mixing and then are carded into a net, so that glass fiber base cloth is prepared;
according to the proportion, the flame-retardant fibers are paved on the upper surface and the lower surface of the glass fiber base cloth, and are combined together by needling with a needling machine to obtain a composite filter felt;
singeing the composite filter felt;
immersing the composite filter felt in PTFE emulsion to obtain a composite filter felt mixed with PTFE emulsion;
performing film coating treatment on the composite filter felt mixed with the PTFE emulsion, and performing heat setting to ensure that the PTFE film is wrapped on the composite filter felt;
and carrying out digital printing on the composite filter felt wrapped with the PTFE film, drying, and cutting and sewing to obtain the high-temperature-resistant anti-corrosion flame-retardant filter material.
5. The method for preparing the high-temperature-resistant corrosion-resistant flame-retardant filter material according to claim 4, wherein the needling depth is 2-15 mm, and the needling density is 200-1000 needles/cm 2 The thickness of the glass fiber base cloth is 0.5-2.0 mm.
6. Use of the high temperature resistant corrosion resistant flame retardant filter material according to any one of claims 1 to 5 as a filter element in an industrial high temperature tail gas treatment device.
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| CN202310656388.XA CN116747609A (en) | 2023-06-05 | 2023-06-05 | High-temperature-resistant anti-corrosion flame-retardant filter material and preparation method and application thereof |
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