CN111346431A - Heat-resistant filter felt, preparation method thereof and composite filter felt prepared from heat-resistant filter felt - Google Patents
Heat-resistant filter felt, preparation method thereof and composite filter felt prepared from heat-resistant filter felt Download PDFInfo
- Publication number
- CN111346431A CN111346431A CN201811581973.3A CN201811581973A CN111346431A CN 111346431 A CN111346431 A CN 111346431A CN 201811581973 A CN201811581973 A CN 201811581973A CN 111346431 A CN111346431 A CN 111346431A
- Authority
- CN
- China
- Prior art keywords
- filter felt
- heat
- polyphenylene sulfide
- resistant filter
- modified polyphenylene
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
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
- B01D39/16—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
- B01D39/1623—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous of synthetic origin
-
- 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
- B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
- B01D2239/02—Types of fibres, filaments or particles, self-supporting or supported materials
- B01D2239/0216—Bicomponent or multicomponent fibres
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2273/00—Operation of filters specially adapted for separating dispersed particles from gases or vapours
- B01D2273/20—High temperature filtration
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Filtering Materials (AREA)
Abstract
The invention relates to a heat-resistant filter felt, a preparation method thereof and a composite filter felt prepared from the heat-resistant filter felt, wherein the preparation method comprises the following steps: and blending the modified polyphenylene sulfide fiber and the polytetrafluoroethylene fiber, and then carrying out needling or spunlace processing to obtain the heat-resistant filter felt, wherein the modified polyphenylene sulfide is the polyphenylene sulfide with each sulfur atom randomly connected with N oxygen atoms, and the molar ratio of the oxygen atoms to the sulfur atoms in the modified polyphenylene sulfide is 1.50-1.77: 1. The tensile strength retention rate of the prepared heat-resistant filter felt is more than 90% after the heat-resistant filter felt is aged for 100 hours under the condition of air at the temperature of 280 ℃. The composite filter felt prepared by the method mainly comprises base cloth and a heat-resistant filter felt compounded with the base cloth. The preparation method of the invention has simple process and low cost; the prepared heat-resistant filter felt has excellent heat resistance; the composite filter felt prepared from the heat-resistant filter felt has excellent heat resistance and mechanical properties, and has great application prospect.
Description
Technical Field
The invention belongs to the technical field of high-performance industrial textile materials, and relates to a heat-resistant filter felt, a preparation method thereof and a composite filter felt prepared from the heat-resistant filter felt, in particular to a filter felt prepared by blending modified polyphenylene sulfide fibers with high glass transition temperature and polytetrafluoroethylene fibers, a preparation method thereof and a composite filter felt prepared from the filter felt.
Background
With the development of society, environmental issues are receiving more and more public attention. The main source of atmospheric pollutants today is the combustion of fossil fuels, with the emissions from coal-fired thermal power plants accounting for a significant proportion. At present, the waste gas is generally treated before the waste gas is discharged by a thermal power station, and dust removal is a key step in the waste gas treatment. At present, a thermal power station mostly adopts a high-temperature flue gas dust removal bag for dust removal, and the high-temperature flue gas dust removal bag is generally made of polyphenylene sulfide fiber felt. Polyphenylene sulfide fiber is a crystalline polymer with a glass transition temperature of 150 ℃, and is used as a high-temperature filter material due to excellent corrosion resistance, radiation resistance and flame retardant properties and balanced physical and mechanical properties.
However, in practical application, the flue gas temperature often exceeds 150 ℃, and the aging problem of the polyphenylene sulfide fiber is aggravated in a high-temperature environment, so that the service life of the polyphenylene sulfide fiber felt is short, and the cost of waste gas treatment is increased. In order to overcome the problem, in patent 201220079645.5, polytetrafluoroethylene fibers are added into polyphenylene sulfide fibers to prepare a polyphenylene sulfide fiber/polytetrafluoroethylene fiber composite felt, which prolongs the service life, but the processing difficulty brought by the characteristics of self-lubricity, creep property and low strength of the surfaces of the polytetrafluoroethylene fibers limits the addition amount of polytetrafluoroethylene, which causes the service life of the composite felt to be difficult to further improve, and meanwhile, the aging problem of the polyphenylene sulfide fibers in the composite felt still influences the overall service life of the composite felt.
Therefore, the problem that the polyphenylene sulfide fiber is poor in heat resistance is solved fundamentally, and the development of the filter felt with excellent heat resistance is of great practical significance.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, provides a filter felt with excellent heat resistance and a preparation method thereof, and simultaneously prepares a composite filter felt from the filter felt with excellent heat resistance. According to the invention, oxygen atoms are grafted on sulfur atoms of polyphenylene sulfide through electron irradiation, so that each sulfur atom is randomly connected with 0-2 oxygen atoms, the glass transition temperature (heat resistance) of modified polyphenylene sulfide is improved, the glass transition temperature of the modified polyphenylene sulfide reaches above 410 ℃, after the modified polyphenylene sulfide is prepared into fibers, the fibers are blended with polytetrafluoroethylene fibers and then subjected to needling or spunlacing processing to prepare the heat-resistant filter felt, the modified polyphenylene sulfide fibers and the polytetrafluoroethylene fibers in the heat-resistant filter felt are excellent in heat resistance, are not easy to age at high temperature and long in service life, and then the heat-resistant filter felt and base cloth are compounded to prepare the composite filter felt, wherein the composite filter felt inherits the excellent performance of the heat-resistant filter felt.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a heat-resistant filter felt mainly comprises modified polyphenylene sulfide fibers and polytetrafluoroethylene fibers, wherein the modified polyphenylene sulfide is polyphenylene sulfide in which each sulfur atom is randomly connected with N oxygen atoms, N corresponding to all the sulfur atoms is a random number in an interval [0,2], the random number is a clear mathematical concept, namely the number of the oxygen atoms connected with the sulfur atoms in the polyphenylene sulfide is 0, 1 or 2, at least one sulfur atom is connected with 0 oxygen atom, at least one sulfur atom is connected with 2 oxygen atoms, the molar ratio of the oxygen atoms to the sulfur atoms in the modified polyphenylene sulfide is 1.50-1.77: 1, and technicians in the field can adjust the molar ratio of the oxygen atoms to the sulfur atoms within a certain range, but the adjustment range is not too large, and the molar ratio is too large, so that the strength of the polyphenylene sulfide is influenced; the molar ratio is too small, oxygen atom grafting is insufficient, and the heat resistance is not obviously improved; the molar ratio is the range of molar ratio which is obviously improved on the heat resistance after the research of the invention; according to the invention, the heat resistance of the modified polyphenylene sulfide is greatly improved by modifying the polyphenylene sulfide, the fiber is prepared from the modified polyphenylene sulfide, and is blended with the polytetrafluoroethylene fiber with good heat resistance to prepare the filter felt, the filter felt inherits the excellent heat resistance of the modified polyphenylene sulfide and the polytetrafluoroethylene, and meanwhile, the addition of the polytetrafluoroethylene fiber also endows the filter felt with good surface self-cleaning performance.
As a preferred technical scheme:
according to the heat-resistant filter felt, after the heat-resistant filter felt is aged for 100 hours by thermal oxidation under the air condition with the temperature of 280 ℃, the tensile strength retention rate is more than 90 percent; the tensile strength retention rate of the filter felt (composed of unmodified polyphenylene sulfide fibers and polytetrafluoroethylene fibers) in the prior art is less than or equal to 40% under the same condition; according to the invention, the polyphenylene sulfide is modified to prepare the filter felt, so that the heat resistance of the filter felt is greatly improved;
the heat-resistant filter felt is a needle felt or a spunlace felt, and the areal gram weight is 500-800 g/m2(ii) a The larger the gram weight of the fabric is, the higher the tensile strength of the fabric is, and the poorer the air permeability of the fabric is;
the content of the modified polyphenylene sulfide fibers in the heat-resistant filter felt is 60-80 wt%, the mechanical strength is insufficient when the content of the modified polyphenylene sulfide fibers in the filter felt is too small, and the excessive filtering performance is not ideal;
the titer of modified polyphenylene sulfide fibers or polytetrafluoroethylene fibers in the heat-resistant filter felt is 1.0-5.0 denier, the fiber titer is too small, the processing difficulty is large, and the titer is too large, so that the filtering performance of the filter felt is influenced.
The heat-resistant filter felt has the advantages that the glass transition temperature of the modified polyphenylene sulfide is more than or equal to 410 ℃, the LOI is more than or equal to 32%, and no molten drop is generated during combustion. The performance parameters of the modified polyphenylene sulfide prepared by the present invention are not limited thereto, and only some of the performance parameters of the modified polyphenylene sulfide prepared by the present invention are listed here. The LOI of common polyphenylene sulfide is less than 32%, and molten drops are generated during combustion. The invention overcomes the defect of molten drop generation during combustion by modifying the polyphenylene sulfide, and obviously improves the flame retardant property of the polyphenylene sulfide.
The preparation method of the modified polyphenylene sulfide of the heat-resistant filter felt comprises the following steps: under the action of catalyst, atomic oxygen in ozone is grafted to sulfur atom of polyphenylene sulfide through electron irradiation. According to the invention, an electron irradiation method is selected as a modification method, so that the reaction time is short, and energy can be accurately and rapidly provided; meanwhile, ozone is selected as an oxygen atom raw material, the oxidation activity of the ozone is high, and the oxidation grafting rate can be controlled more accurately by adjusting the flow of the ozone. In addition, the grafting oxidation process of the invention does not influence the excellent acid resistance of the polyphenylene sulfide.
The preparation steps of the modified polyphenylene sulfide of the heat-resistant filter felt are as follows:
(1) dipping polyphenylene sulfide into an aqueous solution of a catalyst;
(2) continuously introducing ozone into the system in the step (1), fully mixing, and simultaneously irradiating the system in the step (1) by using a high-energy electron beam with energy of 0.1-10 Mev to perform grafting reaction until the weight of the system is increased by 22-26 wt%; under the action of a catalyst, through high-energy electron radiation, a part of oxygen atoms provided by ozone react with polyphenylene sulfide to graft oxygen atoms on sulfur atoms in polyphenylene sulfide molecules, the form of grafting the oxygen atoms on the polyphenylene sulfide is a random order state, and the intensity of the polyphenylene sulfide is influenced due to the overlarge energy of high-energy electron beams; the energy of the high-energy electron beam is too small, so that oxygen atoms are difficult to be grafted on sulfur atoms of polyphenylene sulfide sufficiently, and the heat resistance is not obviously improved;
(3) and taking out the reaction product, and washing and drying to obtain the modified polyphenylene sulfide.
The heat-resistant filter felt is characterized in that the polyphenylene sulfide is in the form of fibers; the concentration of the aqueous solution of the catalyst is 0.1 wt% -0.5 wt%, and the concentration of the aqueous solution of the catalyst can be adjusted within a certain range by a person skilled in the art, but the adjustment range is not too large, and the concentration is too large, so that the waste of the catalyst is caused, and the cost is increased; the concentration is too low, oxygen atoms are difficult to be sufficiently grafted on sulfur atoms of polyphenylene sulfide, and the heat resistance is not obviously improved; the catalyst is potassium permanganate or sodium perborate; the mass ratio of the adding amount of the polyphenylene sulfide to the adding amount of the catalyst in the system in the step (1) is 100-200: 1, and a person skilled in the art can adjust the mass ratio within a certain range, but the adjusting range is not too large, the mass ratio is too large, oxygen atoms are difficult to be grafted on sulfur atoms of the polyphenylene sulfide sufficiently, and the heat resistance is not obviously improved; the mass ratio is too small, namely the adding amount of the catalyst is too much, so that the waste of the catalyst is caused, and the cost is increased; the flow of the ozone is Mg/min, M is 1-2 times of the mass of the polyphenylene sulfide in the step (1), the oxidation grafting rate can be accurately controlled by controlling the flow of the ozone, so that the performance of a product is controlled, the flow of the ozone can be adjusted within a proper range, but the flow of the ozone is not too high, and the strength of the polyphenylene sulfide is influenced due to overlarge flow of the ozone; the flow of ozone is too small, the grafting of oxygen atoms is insufficient, and the heat resistance is not obviously improved.
The invention also provides a method for preparing the heat-resistant filter felt, which is to mix the modified polyphenylene sulfide fiber and the polytetrafluoroethylene fiber and then carry out needling or spunlace processing. The prior filter felt processing technology only comprises a needling method or a water needling method, so the invention only lists the two processing technologies, but the protection scope of the filter felt is not limited to the two processing technologies, and other technologies capable of processing the filter felt can also be suitable for the invention.
The invention also provides a composite filter felt prepared from the heat-resistant filter felt, which mainly comprises base cloth and the heat-resistant filter felt compounded with the base cloth. The heat-resistant filter felt and the base cloth are compounded, so that the good heat resistance of the filter felt is ensured, and the mechanical property of the filter felt is obviously improved.
As a preferred technical scheme:
according to the composite filter felt, the warp-wise strength of the composite filter felt is more than or equal to 800N, and the weft-wise strength of the composite filter felt is more than or equal to 800N.
The composite filter felt has the base cloth with the area weight of 80-150 g/m2The base cloth is woven by yarns, and the yarns are spun by modified polyphenylene sulfide fibers or polytetrafluoroethylene fibers.
The invention mechanism is as follows:
the invention prepares the filter felt with excellent heat resistance by blending modified polyphenylene sulfide and polytetrafluoroethylene fiber with excellent heat resistance after preparing the fiber, the modified polyphenylene sulfide is prepared by selecting an electron irradiation method as a modification method and modifying the polyphenylene sulfide by taking ozone as an oxygen atom raw material, the reaction time of the electron irradiation method is short and can accurately and quickly provide energy, the oxidation activity of the ozone is high, the oxidation grafting rate can be controlled more accurately by adjusting the flow of the ozone, the oxygen atom is grafted on the polyphenylene sulfide, the electron cloud density of a benzene ring is reduced by the conjugation effect formed by a sulfur-oxygen bond, the vitrification temperature is obviously improved, the heat resistance of the polyphenylene sulfide is further improved, meanwhile, the grafting of the oxygen atom also improves the flame retardant property of the polyphenylene sulfide, and because the modified polyphenylene sulfide and the polytetrafluoroethylene which are main components in the filter felt have excellent heat resistance, therefore, the heat resistance of the filter felt is excellent, in addition, the addition of the polytetrafluoroethylene fiber also endows the filter felt with good surface self-cleaning performance, and the filter felt can be compounded with base cloth to prepare a composite filter felt which further enhances the mechanical performance.
Has the advantages that:
(1) the preparation method of the heat-resistant filter felt has the advantages of simple process and low cost;
(2) the heat-resistant filter felt disclosed by the invention is excellent in heat resistance, long in high-temperature service life, good in flame retardant property, good in surface self-cleaning property and good in application prospect;
(3) the composite filter felt prepared from the heat-resistant filter felt has excellent heat resistance and good mechanical property.
Detailed Description
The invention will be further illustrated with reference to specific embodiments. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
Example 1
A preparation method of a heat-resistant filter felt comprises the following steps:
(1) preparing modified polyphenylene sulfide;
(1.1) 500kg of a polyphenylene sulfide fiber having a fineness of 1.5 denier and a length of 51 mm was immersed in 1000kg of a 0.5 wt% aqueous solution of potassium permanganate.
(1.2) continuously introducing ozone into the system in the step (1.1), fully mixing, and simultaneously adopting a high-energy electron beam with energy of 10Mev to irradiate the system in the step (1.1) for grafting reaction until the weight of the system is increased by 25 wt%, wherein the flow rate of the ozone is 800 kg/min;
(1.3) taking out the reaction product, washing and drying to prepare modified polyphenylene sulfide;
the glass transition temperature of the prepared modified polyphenylene sulfide is 425 ℃, the LOI is 37%, no molten drop is generated during combustion, each sulfur atom in the modified polyphenylene sulfide molecule is randomly connected with N oxygen atoms, the random is that N corresponding to all the sulfur atoms is a random number in an interval [0,2], and the molar ratio of the oxygen atoms to the sulfur atoms in the modified polyphenylene sulfide is 1.70: 1;
(2) preparing a heat-resistant filter felt;
and (2) blending the modified polyphenylene sulfide fiber obtained in the step (1) with polytetrafluoroethylene fiber with the fineness of 1.0 denier and the length of 51 mm in a mass ratio of 80:20, and then carrying out needling processing to obtain the heat-resistant filter felt.
The obtained heat-resistant filter felt has an area gram weight of 600 g/m2(ii) a The retention of tensile strength after 100 hours of thermo-oxidative aging in air at a temperature of 280 ℃ was 98%.
Mixing the heat-resistant filter felt with an area weight of 150 g/m2The base cloth is compounded to prepare the composite filter felt, the base cloth is woven by yarns, and the yarns are spun by polytetrafluoroethylene fibers.
The warp strength of the finally prepared composite filter felt is 1000N, and the weft strength is 1000N.
Example 2
A preparation method of a heat-resistant filter felt comprises the following steps:
the modified polyphenylene sulfide fiber obtained in example 1 and polytetrafluoroethylene fiber with fineness of 2.0 denier and length of 51 mm were mixed in a mass ratio of 60:40 and subjected to spunlace processing to obtain a heat-resistant filter felt.
The obtained heat-resistant filter felt has an area gram weight of 500 g/m2(ii) a The retention rate of tensile strength after thermo-oxidative aging for 100 hours under the air condition with the temperature of 280 ℃ is 92 percent.
Mixing the heat-resistant filter felt with an area weight of 80 g/m2The base cloth is compounded to prepare the composite filter felt, the base cloth is woven by yarns, and the yarns are spun by polytetrafluoroethylene fibers.
The warp strength of the finally prepared composite filter felt is 800N, and the weft strength is 800N.
Example 3
A preparation method of a heat-resistant filter felt comprises the following steps:
the modified polyphenylene sulfide fiber obtained in example 1 and a polytetrafluoroethylene fiber having a fineness of 3.0 denier and a length of 51 mm were blended at a mass ratio of 70:30 and subjected to a needle punching process to obtain a heat-resistant filter felt.
The obtained heat-resistant filter felt has an area gram weight of 600 g/m2(ii) a The tensile strength retention rate after 100 hours of thermo-oxidative aging under the air condition with the temperature of 280 ℃ is 94 percent.
Mixing the heat-resistant filter felt with an area weight of 100 g/m2The base cloth was woven with yarns spun from the modified polyphenylene sulfide fiber produced in example 1.
The warp strength of the finally prepared composite filter felt is 980N, and the weft strength is 980N.
Example 4
A preparation method of a heat-resistant filter felt comprises the following steps:
the modified polyphenylene sulfide fiber obtained in example 1 and a polytetrafluoroethylene fiber having a fineness of 1.5 denier and a length of 51 mm were blended at a mass ratio of 80:20 and subjected to a needle punching process to obtain a heat-resistant filter felt.
The obtained heat-resistant filter felt has an area gram weight of 600 g/m2(ii) a The retention rate of tensile strength after thermo-oxidative aging for 100 hours under the air condition of 280 ℃ is 99%.
Mixing the heat-resistant filter felt with an area weight of 150 g/m2The base cloth was woven with yarns spun from the modified polyphenylene sulfide fiber produced in example 1.
The warp strength of the finally prepared composite filter felt is 1100N, and the weft strength is 1100N.
Example 5
A preparation method of a heat-resistant filter felt comprises the following steps:
(1) preparing modified polyphenylene sulfide;
(1.1) 101kg of a polyphenylene sulfide fiber having a fineness of 2.0 denier and a length of 65 mm was immersed in 1000kg of a 0.1 wt% aqueous solution of potassium permanganate.
(1.2) continuously introducing ozone into the system in the step (1.1), fully mixing, and simultaneously irradiating the system in the step (1.1) by using a high-energy electron beam with energy of 0.1Mev to carry out grafting reaction until the weight of the system is increased by 22 wt%, wherein the flow rate of the ozone is 101 kg/min;
(1.3) taking out the reaction product, washing and drying to prepare modified polyphenylene sulfide;
the glass transition temperature of the prepared modified polyphenylene sulfide is 410 ℃, the LOI is 32%, no molten drop is generated during combustion, each sulfur atom in the modified polyphenylene sulfide molecule is randomly connected with N oxygen atoms, the random is that N corresponding to all the sulfur atoms is a random number in an interval [0,2], and the molar ratio of the oxygen atoms to the sulfur atoms in the modified polyphenylene sulfide is 1.50: 1;
(2) preparing a heat-resistant filter felt;
and (2) blending the modified polyphenylene sulfide fiber obtained in the step (1) with polytetrafluoroethylene fiber with the fineness of 2.0 denier and the length of 65 mm in a mass ratio of 70:30, and then carrying out needling processing to obtain the heat-resistant filter felt.
The obtained heat-resistant filter felt has an areal gram weight of 700 g/m2(ii) a The retention rate of tensile strength after thermo-oxidative aging for 100 hours under the air condition with the temperature of 280 ℃ is 92 percent.
Mixing the heat-resistant filter felt with an area weight of 100 g/m2The base cloth is compounded to prepare the composite filter felt, the base cloth is woven by yarns, and the yarns are spun by polytetrafluoroethylene fibers.
The warp strength of the finally prepared composite filter felt is 1250N, and the weft strength is 1250N.
Example 6
A preparation method of a heat-resistant filter felt comprises the following steps:
(1) preparing modified polyphenylene sulfide;
(1.1) 600kg of a polyphenylene sulfide fiber having a fineness of 5.0 denier and a length of 76 mm was immersed in 1000kg of a 0.3 wt% aqueous solution of potassium permanganate.
(1.2) continuously introducing ozone into the system in the step (1.1), fully mixing, and simultaneously irradiating the system in the step (1.1) by using a high-energy electron beam with energy of 9.5Mev to carry out grafting reaction until the weight of the system is increased by 26 wt%, wherein the flow rate of the ozone is 1200 kg/min;
(1.3) taking out the reaction product, washing and drying to prepare modified polyphenylene sulfide;
the glass transition temperature of the prepared modified polyphenylene sulfide is 430 ℃, the LOI is 39%, no molten drop is generated during combustion, each sulfur atom in the modified polyphenylene sulfide molecule is randomly connected with N oxygen atoms, the random is that N corresponding to all the sulfur atoms is a random number in an interval [0,2], and the molar ratio of the oxygen atoms to the sulfur atoms in the modified polyphenylene sulfide is 1.77: 1;
(2) preparing a heat-resistant filter felt;
and (2) blending the modified polyphenylene sulfide fiber obtained in the step (1) with polytetrafluoroethylene fiber with the fineness of 5.0 denier and the length of 76 mm in a mass ratio of 80:20, and then carrying out needling processing to obtain the heat-resistant filter felt.
The obtained heat-resistant filter felt has an area gram weight of 800 g/m2(ii) a The retention rate of tensile strength after thermo-oxidative aging for 100 hours under the air condition of 280 ℃ is 99%.
Mixing the heat-resistant filter felt with an area weight of 150 g/m2The base cloth is compounded to prepare the composite filter felt, the base cloth is woven by yarns, and the yarns are spun by polytetrafluoroethylene fibers.
The warp strength of the finally prepared composite filter felt is 1500N, and the weft strength is 1500N.
Claims (10)
1. A heat-resistant filter felt is characterized in that: the modified polyphenylene sulfide is formed by randomly connecting each sulfur atom with N oxygen atoms, N corresponding to all the sulfur atoms is a random number in an interval [0,2], and the molar ratio of the oxygen atoms to the sulfur atoms in the modified polyphenylene sulfide is 1.50-1.77: 1.
2. The heat-resistant filter felt according to claim 1, wherein the heat-resistant filter felt has a tensile strength retention rate of 90% or more after being subjected to thermo-oxidative aging for 100 hours under an air condition at a temperature of 280 ℃;
the heat-resistant filter felt is a needle felt or a spunlace felt, and the areal gram weight is 500-800 g/m2；
The content of the modified polyphenylene sulfide fibers in the heat-resistant filter felt is 60-80 wt%;
the fineness of the modified polyphenylene sulfide fibers or polytetrafluoroethylene fibers in the heat-resistant filter felt is 1.0-5.0 denier.
3. The heat resistant filter felt according to claim 1, wherein the modified polyphenylene sulfide has a glass transition temperature of 410 ℃ or higher, an LOI of 32% or higher, and no generation of molten droplets during combustion.
4. The heat-resistant filter felt according to claim 1, wherein the preparation method of the modified polyphenylene sulfide comprises the following steps: under the action of catalyst, atomic oxygen in ozone is grafted to sulfur atom of polyphenylene sulfide through electron irradiation.
5. The heat resistant filter felt according to claim 4, wherein the modified polyphenylene sulfide is prepared by the following steps:
(1) dipping polyphenylene sulfide into an aqueous solution of a catalyst;
(2) continuously introducing ozone into the system in the step (1), fully mixing, and simultaneously irradiating the system in the step (1) by using a high-energy electron beam with energy of 0.1-10 Mev to perform grafting reaction until the weight of the system is increased by 22-26 wt%;
(3) and taking out the reaction product, and washing and drying the reaction product.
6. A heat resistant filter felt according to claim 5, wherein the polyphenylene sulfide is in the form of fibers; the concentration of the aqueous solution of the catalyst is 0.1-0.5 wt%; the catalyst is potassium permanganate or sodium perborate; the mass ratio of the adding amount of the polyphenylene sulfide to the adding amount of the catalyst in the system in the step (1) is 100-200: 1; the flow rate of the ozone is M g/min, and M is 1-2 times of the mass of the polyphenylene sulfide in the step (1).
7. A method of making a heat resistant filter felt according to any one of claims 1 to 6, wherein: and blending the modified polyphenylene sulfide fiber and the polytetrafluoroethylene fiber and then carrying out needling or spunlace processing.
8. A composite filter felt made from the heat resistant filter felt according to any one of claims 1 to 6, wherein: mainly comprises base cloth and a heat-resistant filter felt compounded with the base cloth.
9. The composite filter felt according to claim 8, wherein the composite filter felt has a warp strength of 800N or greater and a weft strength of 800N or greater.
10. The composite filter felt according to claim 8, wherein the area weight of the base cloth is 80 to 150 g/m2The base cloth is woven by yarns, and the yarns are spun by modified polyphenylene sulfide fibers or polytetrafluoroethylene fibers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811581973.3A CN111346431B (en) | 2018-12-24 | 2018-12-24 | Heat-resistant filter felt, preparation method thereof and composite filter felt prepared from heat-resistant filter felt |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811581973.3A CN111346431B (en) | 2018-12-24 | 2018-12-24 | Heat-resistant filter felt, preparation method thereof and composite filter felt prepared from heat-resistant filter felt |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111346431A true CN111346431A (en) | 2020-06-30 |
| CN111346431B CN111346431B (en) | 2021-08-24 |
Family
ID=71191969
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811581973.3A Active CN111346431B (en) | 2018-12-24 | 2018-12-24 | Heat-resistant filter felt, preparation method thereof and composite filter felt prepared from heat-resistant filter felt |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111346431B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114432792A (en) * | 2022-01-26 | 2022-05-06 | 江苏奥凯环境技术有限公司 | High-temperature-resistant corrosion-resistant multilayer filter material |
| CN114474930A (en) * | 2022-01-26 | 2022-05-13 | 江苏奥凯环境技术有限公司 | Multilayer filter material used in severe environment |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0345634A (en) * | 1989-07-13 | 1991-02-27 | Toray Ind Inc | Preparation of high-modulus polyarylene sulfide |
| CN1989177A (en) * | 2004-07-23 | 2007-06-27 | 东丽株式会社 | Polyarylene sulfide oxide, solid article and process for producing the same |
| CN202460299U (en) * | 2012-03-06 | 2012-10-03 | 必达福环境技术(无锡)有限公司 | Polyphenylene sulfide and polytetrafluoroethylene fiber high-temperature resistance teflon permeation film needling filter felt |
| DE102012004227A1 (en) * | 2012-03-06 | 2013-09-12 | Carl Freudenberg Kg | Producing polymer fibers, preferably e.g. nonwoven fabric, comprises extruding polymer melt using spinning nozzle arrangement to obtain polymer fibers in free jet, stretching fibers using primary gas stream, and cooling and tempering fibers |
| CN104771958A (en) * | 2015-03-25 | 2015-07-15 | 浙江华基环保科技有限公司 | Polyphenylene sulfide-polytetrafluoroethylene composite needle felt and making method thereof |
| CN105498363A (en) * | 2015-12-22 | 2016-04-20 | 苏州协泰科技有限公司 | Production technology for modified PPS fiber filtering material |
| CN105854419A (en) * | 2016-05-11 | 2016-08-17 | 安徽元琛环保科技股份有限公司 | Production method of electret compound filter material |
| CN106390594A (en) * | 2016-10-25 | 2017-02-15 | 骆华军 | Highly tenacious nylon monofilament filter cloth modified by radiation grafting of nanocarbon sol and nanographite and preparation method thereof |
-
2018
- 2018-12-24 CN CN201811581973.3A patent/CN111346431B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0345634A (en) * | 1989-07-13 | 1991-02-27 | Toray Ind Inc | Preparation of high-modulus polyarylene sulfide |
| CN1989177A (en) * | 2004-07-23 | 2007-06-27 | 东丽株式会社 | Polyarylene sulfide oxide, solid article and process for producing the same |
| CN202460299U (en) * | 2012-03-06 | 2012-10-03 | 必达福环境技术(无锡)有限公司 | Polyphenylene sulfide and polytetrafluoroethylene fiber high-temperature resistance teflon permeation film needling filter felt |
| DE102012004227A1 (en) * | 2012-03-06 | 2013-09-12 | Carl Freudenberg Kg | Producing polymer fibers, preferably e.g. nonwoven fabric, comprises extruding polymer melt using spinning nozzle arrangement to obtain polymer fibers in free jet, stretching fibers using primary gas stream, and cooling and tempering fibers |
| CN104771958A (en) * | 2015-03-25 | 2015-07-15 | 浙江华基环保科技有限公司 | Polyphenylene sulfide-polytetrafluoroethylene composite needle felt and making method thereof |
| CN105498363A (en) * | 2015-12-22 | 2016-04-20 | 苏州协泰科技有限公司 | Production technology for modified PPS fiber filtering material |
| CN105854419A (en) * | 2016-05-11 | 2016-08-17 | 安徽元琛环保科技股份有限公司 | Production method of electret compound filter material |
| CN106390594A (en) * | 2016-10-25 | 2017-02-15 | 骆华军 | Highly tenacious nylon monofilament filter cloth modified by radiation grafting of nanocarbon sol and nanographite and preparation method thereof |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114432792A (en) * | 2022-01-26 | 2022-05-06 | 江苏奥凯环境技术有限公司 | High-temperature-resistant corrosion-resistant multilayer filter material |
| CN114474930A (en) * | 2022-01-26 | 2022-05-13 | 江苏奥凯环境技术有限公司 | Multilayer filter material used in severe environment |
| CN114432792B (en) * | 2022-01-26 | 2022-12-13 | 江苏奥凯环境技术有限公司 | High-temperature-resistant corrosion-resistant multilayer filter material |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111346431B (en) | 2021-08-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111346431B (en) | Heat-resistant filter felt, preparation method thereof and composite filter felt prepared from heat-resistant filter felt | |
| CN100503912C (en) | Preparation method of flame-proof algae fiber material | |
| CN111996798B (en) | LBL method expansion type flame-retardant cotton fabric coating and coating method thereof | |
| Tian et al. | The effect of zinc ion content on flame retardance and thermal degradation of alginate fibers | |
| CN103252214A (en) | Active carbon fiber and graded porous Ni-Ni3P/active carbon fiber composite material as well as preparation and application of two | |
| CN106758169A (en) | A kind of method for sorting of anti-flammability real silk fabric and its application | |
| CN114214750A (en) | Flame-retardant polyacrylonitrile composite fiber and preparation method and application thereof | |
| CN103418187A (en) | Filter material for dust removal and low-temperature denitration and application thereof | |
| JP2024535404A (en) | Coke making and flue gas treatment system and method | |
| CN116532084A (en) | Nd-doped Bi 2 WO 6 Preparation and application of nanoflower-biomass porous carbon material | |
| CN114534373B (en) | Nano SiO 2 Modified polytetrafluoroethylene dust-removing filter bag and preparation method thereof | |
| CN111350098B (en) | Thermal stability paper material with excellent chemical corrosion resistance and preparation method thereof | |
| CN111349981B (en) | Low-toxicity low-smoke flame-retardant polyester fiber and preparation method thereof | |
| CN111774029B (en) | Preparation of PM from biomass ash2.5Method for producing adsorbent, product and application thereof | |
| CN1540047A (en) | Method for producing Nano fire resistant and fire retardant fiber | |
| CN111349240B (en) | Modified polyphenylene sulfide with high glass transition temperature and preparation method thereof | |
| CN108837598B (en) | A kind of Static Spinning polyimide nano-fiber high-temperature-resistant filtering material | |
| CN105013246A (en) | Filtering material possessing mercury removing efficacy and preparation method thereof | |
| CN1178854C (en) | Method for producing active carbon from coal water mixture | |
| CN118704109A (en) | Fireproof flame-retardant fiber and preparation method thereof | |
| CN115245708B (en) | Heat-resistant filter felt based on polyaryl oxadiazole fibers and preparation method thereof | |
| CN110639282A (en) | High-temperature-resistant flame-retardant filter material and preparation method thereof | |
| CN117987999A (en) | Polyimide/ZIF-8 composite nanofiber membrane containing imidazole ring, and preparation method and application thereof | |
| Jin et al. | Single overall ‘H-shaped’multifunctional compound achieves fire safety, durability, enhanced strength, and smoke suppression of cotton fabrics | |
| CN103170185A (en) | Filter material for coal-fired boilers and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |