CN115245708A - Heat-resistant filter felt based on polyaryl oxadiazole fibers and preparation method thereof - Google Patents
Heat-resistant filter felt based on polyaryl oxadiazole fibers and preparation method thereof Download PDFInfo
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- CN115245708A CN115245708A CN202211154346.8A CN202211154346A CN115245708A CN 115245708 A CN115245708 A CN 115245708A CN 202211154346 A CN202211154346 A CN 202211154346A CN 115245708 A CN115245708 A CN 115245708A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D39/00—Filtering material for liquid or gaseous fluids
- B01D39/08—Filter cloth, i.e. woven, knitted or interlaced material
- B01D39/083—Filter cloth, i.e. woven, knitted or interlaced material of organic material
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- 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
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- 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
- B01D46/02—Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
- B01D2239/06—Filter cloth, e.g. knitted, woven non-woven; self-supported material
- B01D2239/0604—Arrangement of the fibres in the filtering material
- B01D2239/0636—Two or more types of fibres present in the filter material
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- 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
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Abstract
The invention discloses a heat-resistant filter felt based on polyaryl oxadiazole fibers and a preparation method thereof. The heat-resistant filter felt comprises a first fiber web layer, a second fabric reinforcing layer and a third fiber web layer; the second fabric reinforcing layer is a woven fabric made of polyaryl oxadiazole fibers or meta-aramid short fibers; the raw material of the first fiber net layer comprises the following fibers: according to the weight percentage, 20 to 70 percent of first fiber, 15 to 40 percent of polyester staple fiber and 15 to 40 percent of nylon 66 staple fiber; the first fiber comprises one of polyaryl oxadiazole fiber and meta-aramid short fiber; the raw material of the third fiber web layer comprises the following fibers: 20 to 70 percent of polyaryl oxadiazole fiber, 15 to 40 percent of polyester staple fiber and 15 to 40 percent of nylon 66 staple fiber. In the scheme, the prepared heat-resistant filter felt has high use temperature, high instantaneous temperature and high filtering performance, and is particularly suitable for the fields of asphalt mixing plants and mud kilns.
Description
Technical Field
The invention relates to the technical field of heat-resistant filter felts, in particular to a heat-resistant filter felt based on polyaryl oxadiazole fibers and a preparation method thereof.
Background
The use of filter bag filtration is one of the means for reducing air pollution; with the popularization of filter bags in the industry, the domestic air quality also shows the trend of optimization. At the present stage, due to the fact that the operation temperature is high in working conditions of asphalt, a cement kiln and the like, the filter bag is required to have excellent filtering effect and excellent high-temperature resistance and mechanical property.
The polyaryl oxadiazole fiber is called as a Baodelon fiber for short, and has excellent high temperature resistance and wear resistance; but it has poor acid and corrosion resistance. Therefore, in the chinese patent CN106268027A, a high-temperature filter material is prepared by mixing polytetrafluoroethylene fibers and polyaryl oxadiazole fibers, and chemical resistance is increased by introducing the polytetrafluoroethylene fibers, so that the service life is prolonged; however, the density of the polytetrafluoroethylene fiber in the filter material is high, the filtration requirement can be met only by high gram weight, and the cost of the polytetrafluoroethylene fiber is increased, so that the cost is high; meanwhile, after long-term use, the friction coefficient is low, so that the filtering effect is poor, and the service life is influenced. The composite filter material prepared by using the glass fiber and the polyaryl oxadiazole fiber in the Chinese patent CN102836593A has the characteristics of high temperature resistance and low price, but the glass fiber material can weaken the wear resistance of the whole material and influence the service life.
Therefore, it is important to solve the above problems and to prepare a heat resistant filter felt based on polyaryl oxadiazole fibers.
Disclosure of Invention
The invention aims to provide a heat-resistant filter felt based on polyaryl oxadiazole fibers and a preparation method thereof, so as to solve the problems in the background technology.
In order to solve the technical problems, the invention provides the following technical scheme:
a heat resistant filter felt based on polyaryl oxadiazole fibers comprises a first fiber web layer, a second fabric reinforcing layer and a third fiber web layer; the second fabric reinforcing layer is a woven fabric made of polyaryl oxadiazole fibers or meta-aramid short fibers;
the raw material of the first fiber net layer comprises the following fibers: according to the weight percentage, 20 to 70 percent of first fiber, 15 to 40 percent of polyester staple fiber and 15 to 40 percent of nylon 66 staple fiber; the first fiber comprises one of polyaryl oxadiazole fiber and meta-aramid short fiber;
the raw material of the third fiber web layer comprises the following fibers: 20 to 70 percent of polyaryl oxadiazole fiber, 15 to 40 percent of polyester staple fiber and 15 to 40 percent of nylon 66 staple fiber.
Optimally, the gram weight of the heat-resistant filter felt is 400 to 600g/m 2 (ii) a The gram weight of the second fabric reinforcing layer is 70 to 180g/m 2 (ii) a The gram weight ratio of the first fiber web layer to the third fiber web layer is (50) - (70).
Preferably, the gram weight ratio of the first fiber web layer to the third fiber web layer is (55.
Preferably, more than 2 first fibers exist in any cross section of 100 micrometers multiplied by 100 micrometers in the first fiber net layer; at least 2 aramid fibers are present in any cross section of the third web layer of 100. Mu. M.times.100. Mu.m.
Preferably, in the first fiber web layer, the average fineness of the first fibers is 1.0-2.5D, the average fineness of the polyester staple fibers is 1.2-2.0D, and the average fineness of the nylon 66 staple fibers is 1.5-3.0D; in the third fiber web layer, the average fineness of the polyester staple fibers is 1.5-2.0D; the average fineness of nylon 66 short fibers is 1.5 to 3.0D.
Preferably, the method comprises the following steps:
step 1: respectively mixing, opening, cotton blending, carding and lapping first fibers, polyester staple fibers and nylon 66 staple fibers which are raw materials of the first fiber net layer to obtain a first fiber net layer; respectively mixing, opening, cotton blending, carding and lapping raw materials of the polyaryl oxadiazole fibers, the polyester staple fibers and the nylon 66 staple fibers of the third fiber network layer to obtain a third fiber network layer;
wherein, the cotton blending process is as follows: different fibers are captured regularly and quantitatively through different bale openers according to the process requirement, the different fibers are conveyed to a cotton mixing box through cyclone airflow in a domestic advanced mixing mode, the cotton is fully mixed in the cotton mixing box under the action of the airflow, and the mixing time is 1.6 times of the common cotton mixing time and is about 10 to 15 minutes;
and 2, step: stacking a first fiber net layer, a second fabric reinforced layer and a third fiber net layer in sequence; and (3) carrying out needle punching combination and post-processing to obtain the heat-resistant filter felt.
Optimally, further processing the obtained heat-resistant filter felt to obtain a heat-resistant filter felt B;
the specific process comprises the following steps: placing the heat-resistant filter felt in ferric chloride solution, oscillating, dipping and drying; transferring to sodium hydroxide solution, oscillating, dipping and drying; obtaining a heat-resistant filter felt A;
soaking the heat-resistant filter felt A in polytetrafluoroethylene dispersion liquid, and carrying out oscillation soaking and rolling; transferring to dopamine mixed solution, oscillating, dipping and rolling; drying and shaping to obtain the heat-resistant filter felt B.
Preferably, the ferric chloride solution is a ferric chloride-dichloromethane solution with the concentration of 0.8 to 1.2 wt%; the concentration of the sodium hydroxide solution is 2mol/L; the polytetrafluoroethylene dispersion is a solution of modified polytetrafluoroethylene-deionized water with the concentration of 4-6 wt%; the dopamine mixed solution is obtained by mixing an ethyl silicate-ethanol solution with the volume ratio of 1 to 2 and a dopamine solution with the concentration of 0.28 to 0.32wt%;
preferably, the preparation method of the modified polytetrafluoroethylene comprises the following steps: dispersing a dopamine solution with the concentration of 0.18 to 0.22wt% and a polyethyleneimine solution in deionized water, and adjusting the pH to be 9.7 to 10.2; adding polytetrafluoroethylene, homogenizing, washing and drying; transferring the mixture into phosphorus oxychloride solution, stirring, washing and drying to obtain the modified polytetrafluoroethylene.
Preferably, the application of the heat-resistant filter felt based on the polyaryl oxadiazole fiber is characterized in that: the heat-resistant filter felt is sewn by three needles or hot melt to prepare a filter bag, and is applied to the fields of asphalt mixing plants and cement kilns.
In the technical scheme, the heat resistance of the heat-resistant filter felt is improved by adopting the polyaryl oxadiazole fiber (POD fiber) with heat resistance, and meanwhile, the polyester short fiber and the nylon 66 short fiber with wear resistance are introduced, so that the mechanical property and the acid resistance are improved while the cost is reduced, and the service life is prolonged. The prepared heat-resistant filter felt has high use temperature, high instantaneous temperature and high filtering performance. Because of good temperature resistance and low cost, the material can be widely used in places such as waste incineration, asphalt mixing plant, steel, glass kiln, cement and the like, and is particularly suitable for the fields of asphalt mixing plant and mud kiln.
(1) The first fiber net layer is a facing layer and is composed of three fibers, wherein the first fiber is one of POD (polyethylene glycol terephthalate) fiber or meta-aramid short fiber, the average titer is 1.0-2.5D, the titer determines the filtering effect of the heat-resistant filter felt, and when the filtering performance is up to 10mg/Nm 3 When the content is within the range, fibers of 1.0 to 1.3D are used; when the filtration performance is to reach the discharge of 20mg/Nm 3 When the discharge is not required, the fiber is used for 1.3 to 1.7D, and when the fiber is thinner, the cost of the raw material is higher, so that the fiber is used for more than 1.7D; however, when the fiber fineness is 2.5D or more, the strength of the whole web after web formation is reduced because of the decrease in inter-fiber entanglement, and therefore, it is necessary to control the average fineness.
Wherein, the polyester staple fiber is introduced, the price is low, but the heat resistance is poor, and if the filter felt is prepared by pure polyester fiber, the long-term use temperature is 130 ℃. When the introduced amount is not more than 50wt%, the long-term use temperature is 180 ℃ and the maximum instantaneous use temperature is 220 ℃ due to the presence of heat-resistant POD fibers or meta-aramid short fibers in the filter felt. In the scheme, the introduction amount of the polyester fiber is controlled to be not less than 20wt% due to the consideration requirements of cost, mechanical property and corrosion resistance, and the more optimal scheme is the introduction amount of 25 to 35wt%. In addition, the selection of the polyester staple fibers corresponds to the first fiber, and the finer the fiber, the more the fiber can correspond to the low emission requirement.
The nylon 66 short fiber is introduced, the heat resistance of the nylon 66 short fiber is between that of the first fiber and that of the polyester short fiber, the nylon 66 short fiber has extremely high strength, the overall strength of the filter felt can be increased, and the nylon 66 short fiber also has the characteristics of alkali resistance and low cost.
Therefore, the three fibers are combined, optimized and complemented, and can correspond to high temperature and corrosive environment while reducing cost.
(2) The third fiber net layer is a non-head-on layer and consists of POD fibers, polyester staple fibers and nylon 66 staple fibers. Since POD fibers are not lower in heat resistance than meta-aramid staple fibers, but superior in abrasion resistance and low cost to meta-aramid staple fibers, POD fibers are used instead of aramid fibers for friction resistance in the contact between the third fiber web layer and the keel. Similarly, the amount of the three fibers to be incorporated is controlled in consideration of the combination of temperature resistance, wear resistance, corrosion resistance, and the like.
(3) The first fiber net layer and the third fiber net layer are complementary, the first fiber net layer provides a filtering effect, and the third fiber net layer provides strength to protect the second fabric reinforcing layer; therefore, on the basis that the first fiber web layer and the third fiber web layer are similar in structure and on the premise that the total gram weight is the same, the more the first fiber web layer is, the better the filtering effect is, and therefore the proportion of the first fiber web layer is required to be more than 50 wt%; in order to prevent the third fiber net layer from rubbing against the keel to cause abrasion, so that the strength is reduced and the third fiber net layer is damaged, the ratio of the third fiber net layer is required to be more than 30wt%, and therefore, the gram weight ratio of the first fiber net layer to the third fiber net layer is (55) - (65).
In addition, the second fabric reinforcing layer is woven fabric and is made of polyester staple fiber or meta-aramid staple fiber; mainly provides radial strong force, and the gram weight of the radial strong force is 70 to 180g/m 2 The gram weight of the total heat-resistant filter felt is 400 to 600g/m 2 The gram weight of the second fabric layer is cut, and the gram weights of the first fiber web layer and the third fiber web layer are more than or equal to 300g/m 2 Otherwise, the desired filtering effect is difficult to achieve and the weft-wise force is low.
(4) In the scheme, the radial strength of the prepared heat-resistant filter felt is more than or equal to 800N/5cm, and the latitudinal strength is more than or equal to 1000N/5cm; the significance of the mechanical property is that the prepared filter felt can be stably used in a dust remover for a long time, and the filter felt needs to have excellent radial strength and weft strength because the blowing action can generate certain pressure to the warp and weft directions of the filter felt.
In addition, the density of the heat-resistant filter felt is 0.25 to 0.45g/cm 2 (ii) a When it is less than 0.25g/cm 2 In time, the fibers are too sparse and fluffy, and the holes are large, so that a high filtering effect cannot be achieved. And > 0.45g/cm 2 In time, the compression is too tight, resulting in increased pressure without increasing filtration efficiency.
(5) In the scheme, more than 2 first fibers exist in any cross section of 100 micrometers multiplied by 100 micrometers in the first fiber net layer; the third web layer has at least 2 aramid fibers in any cross section of 100. Mu. M.times.100. Mu.m. The purpose is to ensure the dispersibility of the heat-resistant fibers (the first fibers and the polyaryl oxadiazole fibers) so as to ensure the overall heat resistance.
Taking the first fiber web layer as an example, the total amount of fibers existing in a cross section of any 100 micrometers multiplied by 100 micrometers is about 6 to 40, and if the distribution of the first fibers in the area is less than 2, the distribution of the first fibers in the whole fiber web is very uneven, and the local degradation and breakage can occur in the filtering process.
In addition, in order to ensure the uniformity of the heat-resistant fibers, a composite cotton mixing method is adopted, and the mixing method is preferably selected from the group consisting of path difference cotton mixing, time difference cotton mixing and tumbling cotton mixing but is not limited to at least two of the three modes. And the cotton mixing time is more than 1.6 times of the common cotton mixing time to ensure that the target is reached. Because the general cotton blending technology can not completely ensure that more than 2 objects exist in any cross section of 100 mu m multiplied by 100 mu m.
(6) In application, the heat-resistant filter felt is sewn by three needles to prepare a filter bag. Three-needle suture can more effectively improve the strength of the suture compared with double-needle suture. Attention is required in the manufacture of the filter felt, if the discharge requirement is lower than 10mg/Nm 3 Special treatment processing is required at the seam, for example, heat-resistant glue is used to block the seam.
(7) In order to further improve the corrosion resistance, the mechanical property and the wear resistance of the heat-resistant filter felt, in the scheme, the heat-resistant filter felt B is obtained by further carrying out multi-step dipping treatment.
The one-step impregnation is carried out in ferric chloride solution and sodium hydroxide solutionThe treatment process of (2) utilizes the oxadiazole ring containing nitrogen and oxygen in the polyaryl oxadiazole fiber or the amino group in the meta-position aramid fiber and ferric trichloride FeCl 3 Coordination, followed by conversion of ferric chloride to ferric hydroxide Fe (OH) in NaOH solution 3 (ii) a Firstly, can improve surface hydroxyl group and iron ion to utilize the flooding and the adhesion of follow-up coating, the iron hydroxide on surface simultaneously can effectively improve fibrous resistant ultraviolet performance, improves polyaryl oxadiazole fibrous anti-light performance. At the same time, the formation of ferric hydroxide improves its alkali resistance. But because ferric hydroxide is easily reacted with H under acidic condition + The reaction, and therefore the protocol, further impregnation process improves acid resistance.
The two-step dipping treatment is carried out in polytetrafluoroethylene dispersion liquid, and polytetrafluoroethylene is loaded on the surface of the dispersion liquid. In the prior art, because the polytetrafluoroethylene has poor dispersibility in water and is easy to aggregate, the polytetrafluoroethylene is emulsified to form polytetrafluoroethylene emulsion for impregnation treatment, so that the dispersibility is improved; however, polytetrafluoroethylene in the dip coating is not strong in adhesion and is easy to fall off. Therefore, in the technical scheme, polytetrafluoroethylene is subjected to modification treatment, and is coated with a polydopamine-polyethyleneimine layer in a cross-linking manner on the surface of the polytetrafluoroethylene in a solution of low-concentration dopamine and polyethyleneimine, so that the surface charge of the polytetrafluoroethylene is changed from negative charge to positive charge, and the dispersibility of the polytetrafluoroethylene is improved; at the same time, it is placed in phosphorus oxychloride. The metal ion chelate can react with amino groups of a polydopamine-polyethyleneimine layer, and is phosphorylated, so that the chelation of the surface of the polydopamine-polyethyleneimine layer and metal ions is improved, and the adhesion of the polydopamine-polyethyleneimine layer and a heat-resistant filter felt containing an iron hydroxide surface after one-time treatment is enhanced; the corrosion resistance is effectively improved through the uniform loading of the surface of the polytetrafluoroethylene.
In order to improve the wear resistance and long-term use, the solution is further placed in a mixed solution of dopamine and tetraethyl silicate, and the tetraethyl silicate is hydrolyzed into silicon dioxide with abundant hydroxyl groups in an alkaline environment. The hydrophilic silica can be co-deposited on the polytetrafluoroethylene surface by dopamine assistance. The sliding property between the silicon dioxide and the polytetrafluoroethylene is utilized; the high-temperature wear resistance is increased, thereby enhancing the long-term service temperature. Meanwhile, the acid resistance is improved by the aid of polytetrafluoroethylene.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the following examples, the purchased sources of fiber are:
the baodelon fiber was purchased from Jiangsu Baodede New Material Co., ltd, the PTFE fiber was purchased from Nanjing Yinsrude Polymer materials Co., ltd, the nylon 66 fiber was purchased from Weifang Bofite New Material Co., ltd, the aramid fiber was purchased from Imperial aramid trade (Shanghai) Co., ltd, the PTFE emulsion was purchased from Shandong Dongye Polymer materials Co., ltd, and the second fabric reinforcing layer was purchased from Weieke Industrial textile (Jiaxing) Co., ltd.
The preparation processes of the examples 1 to 7 and the comparative examples 1 to 3 are as follows:
step 1: respectively mixing, opening, cotton mixing and carding and lapping first fibers (polyaryl oxadiazole fibers or meta-aramid short fibers), polyester short fibers and nylon 66 short fibers which are used as raw materials of the first fiber net layer to obtain a first fiber net layer; respectively mixing, opening, cotton mixing, carding and lapping the raw materials of the polyaroxadiazole fibers, the polyester staple fibers and the nylon 66 staple fibers of the third fiber net layer to obtain a third fiber net layer;
wherein, the cotton blending process is as follows: different fibers are captured regularly and quantitatively through different bale openers according to the setting of process requirements, are conveyed to a cotton mixing box through cyclone airflow in a domestic advanced mixing mode, and are fully mixed in the cotton mixing box under the action of the airflow, wherein the cotton mixing time is 15 minutes;
step 2: stacking a first fiber net layer, a second fabric reinforcing layer and a third fiber net layer in sequence; and (3) carrying out needle punching combination and post-processing to obtain the heat-resistant filter felt.
And 3, step 3: and (4) sewing the heat-resistant filter felt by three needles without using glue to seal needle holes to obtain the filter bag.
Specific parameters of examples 1 to 7 and comparative examples 3 are shown in the following table. In addition, the preparation process of comparative example 3 is slightly different, step 3: and (4) sewing three needles of the heat-resistant filter felt, and then sealing needle holes by using glue to obtain the filter bag.
Example 8: carrying out subsequent treatment on the basis of the heat-resistant filter felt prepared in the embodiment 1; the following were used:
(1) Dissolving dopamine with different masses in Tri-HCl buffer solution with the pH =8.5 to obtain dopamine solution A with the concentration of 0.2wt% and dopamine solution B with the concentration of 0.3 wt%; dispersing polyethyleneimine in deionized water to obtain 1wt% polyethyleneimine solution; dispersing phosphorus oxychloride in acetonitrile, to obtain a phosphorus oxychloride solution having a concentration of 25% v/v; dispersing ferric chloride in dichloromethane to obtain a 1wt% ferric chloride solution;
(2) Preparing modified polytetrafluoroethylene: dispersing 200mg of dopamine solution A and 1g of polyethyleneimine solution in 100mL of deionized water, and adding ammonia water to adjust the pH to be =10.1; adding 100mg of polytetrafluoroethylene, homogenizing at room temperature for 30 minutes, washing and drying; transferring the polytetrafluoroethylene into 50mL of phosphorus oxychloride solution, setting the temperature at 2 ℃, stirring for 30 minutes, stirring for 2 hours at room temperature, washing and drying to obtain modified polytetrafluoroethylene;
weighing modified polytetrafluoroethylene, and dispersing the modified polytetrafluoroethylene in deionized water to obtain 5wt% of polytetrafluoroethylene dispersion for later use;
(3) Dispersing 0.5g of ethyl silicate in 50mL of ethanol solution, and stirring for 15 minutes to obtain an ethyl silicate solution; adding the mixture into 100mL of dopamine solution B, and stirring for 30 minutes to obtain dopamine mixed solution;
(4) Placing the heat-resistant filter felt prepared in the example 1 into an iron chloride solution at a bath ratio of 1 (20 to 30), vibrating and soaking at room temperature for 4 hours, and drying; transferring the mixture into a sodium hydroxide solution with the concentration of 2mol/L, wherein the bath ratio is 1; drying to obtain a heat-resistant filter felt A;
soaking the heat-resistant filter felt A in a polytetrafluoroethylene dispersion solution at a bath ratio of 1; soaking at room temperature for 2 hr under vibration, and rolling under 0.5 MPa; transferring to a dopamine mixed solution, carrying out oscillation dipping for 1 hour at room temperature with a bath ratio of 1;
(5) And (4) sewing the three needles of the heat-resistant filter felt B without using glue to seal needle holes to obtain the filter bag.
Comparative example 4: using polytetrafluoroethylene emulsion (PTFE emulsion) with solid content of 60wt%, diluting the polytetrafluoroethylene emulsion to 5wt% by using deionized water for impregnation treatment; the rest was the same as in example 1.
Specifically, the method comprises the following steps: adding the heat-resistant filter felt prepared in the example 1 into polytetrafluoroethylene emulsion at a bath ratio of 1; oscillating and dipping for 2 hours at room temperature, and rolling under 0.5 Mpa; drying and shaping at 100 ℃ to obtain a heat-resistant filter felt B;
comparative example 5: in the process of modifying the polytetrafluoroethylene, phosphorus oxychloride solution is not used for modification treatment; the rest is the same as in example 8.
Comparative example 6: the impregnation process of ferric chloride and sodium hydroxide is not used; the rest is the same as in example 8.
Comparative example 7: ethyl silicate is not introduced into the dopamine mixed solution; the rest was the same as in example 8.
Experiment: the materials in the examples and the comparative examples are subjected to related performance detection, and the specific steps are as follows:
(1) Average fineness of fiber: the cross section of the filter material is tested by a Scanning Electron Microscope (SEM), 10 points are randomly extracted on the cross section for sample preparation test, the magnification of each point is 100-500 times, and the diameters of 10 meta-aramid short fibers or polyaryl oxadiazole fibers, 10 polyester fibers and 10 nylon 66 fibers are respectively marked on each point. The total number of fibers is at least 100, and the average value is used to calculate the fineness by the diameter and the density.
(2) Number of 100 μm × 100 μm regio-meta-aramid staple fibers or polyaradiazole fibers: and (3) testing the section of the filter material by using a Scanning Electron Microscope (SEM), randomly extracting 10 points on the section to perform sample preparation test, wherein the magnification of each test point is 600-700 times, taking a 100-micron multiplied by 100-micron area in a picture, and finding out the total number of the aramid short fibers or the polyaryl oxadiazole fibers in the area.
(3) Gram weight: cutting the material into a shape of 20cm multiplied by 20cm by adopting the GB/T4669-2008 standard, respectively weighing at least 5 blocks, then calculating the gram weight of the filter material, and taking the average value.
(4) Density: the thickness was measured based on HG/T2014-2009 standard and the density was calculated by dividing the grammage by the thickness.
(5) Strength: the tensile strength of the samples was tested according to the standard GB/T3923.1-2013 spline method. The sample was taken in the warp and weft directions, respectively, and the sample size was 20cm × 5cm, and the stretching speed was 10 cm/min. The collet spacing was 10cm.
(6) Corrosion resistance: based on the requirement of GB/T6719-2009 filter material for corrosion resistance test, the filter material is soaked in H with the mass fraction of 60 percent and the temperature of 85 DEG C 2 SO 4 Neutralizing for 24 hours; and taking out, fully rinsing by using clear water, drying, and testing the breaking strength and the retention rate according to GB/T3923.1.
All data are shown in tables 1 to 6 below:
table 1:
table 2:
table 3:
table 4:
table 5:
table 6:
and (4) conclusion: the data for the above examples and comparative examples show that: the data in tables 1 to 4 show that: by optimizing the proportion and parameters of various fibers, the cost can be reduced, and the high-temperature performance and the mechanical property of the wool heat filter felt can be effectively improved. The data in tables 5 to 6 show that: the acid resistance can be effectively improved by further dipping treatment. In the comparative example 1, the long-term service temperature is low due to the fact that the content of the aramid short fibers in the middle of the first fiber net layer is low; the long-term service temperature of comparative example 2 was the same as that of example 4, but the cost thereof was higher than that of example 4. In comparison example 3, the cost is increased compared with example 5, and a large amount of neps are generated in the process, so that the production performance is reduced. In comparative example 4, although modified with polytetrafluoroethylene emulsion, the adhesion was poor and the release was easy with long-term use, so the performance was weaker than that of example 8; in the comparative example 5, the mechanical property and the acid resistance are slightly reduced because the modified part of the phosphorus oxychloride solution is not used; in comparative example 6, since iron ions were not introduced, the thermal properties and chelation were decreased, so that the properties were decreased; in comparative example 7, since ethyl silicate was not introduced, the high-temperature wear resistance and the acid resistance were lowered.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A heat-resisting filter felt based on polyaryl oxadiazole fiber is characterized in that: the heat-resistant filter felt comprises a first fiber mesh layer, a second fabric reinforcing layer and a third fiber mesh layer; the second fabric reinforcing layer is a woven fabric made of polyaryl oxadiazole fibers or meta-aramid short fibers;
the raw material of the first fiber web layer comprises the following fibers: according to the weight percentage, 20 to 70 percent of first fiber, 15 to 40 percent of polyester staple fiber and 15 to 40 percent of nylon 66 staple fiber; the first fiber comprises one of polyaryl oxadiazole fiber and meta-aramid short fiber;
the raw material of the third fiber web layer comprises the following fibers: 20 to 70 percent of polyaryl oxadiazole fiber, 15 to 40 percent of polyester staple fiber and 15 to 40 percent of nylon 66 staple fiber in percentage by weight.
2. The heat resistant filter felt based on polyaryl oxadiazole fibers of claim 1, wherein: the gram weight of the heat-resistant filter felt is 400 to 600g/m 2 (ii) a The gram weight of the second fabric reinforcing layer is 70 to 180g/m 2 (ii) a The gram weight ratio of the first fiber web layer to the third fiber web layer is (50) - (70).
3. The heat resistant filter felt based on polyaryl oxadiazole fibers of claim 2, wherein: the first fiber web layer and the third fiber web layer have a gram weight ratio of (55) - (65).
4. The heat resistant filter felt based on polyaryl oxadiazole fibers of claim 1, wherein: more than 2 first fibers exist in any cross section of 100 micrometers multiplied by 100 micrometers in the first fiber net layer; the third web layer has at least 2 aramid fibers in any cross section of 100. Mu. M.times.100. Mu.m.
5. The heat resistant filter felt based on polyaryl oxadiazole fibers of claim 1, wherein: in the first fiber web layer, the average fineness of the first fibers is 1.0-2.5D, the average fineness of the polyester staple fibers is 1.2-2.0D, and the average fineness of the nylon 66 staple fibers is 1.5-3.0D; in the third fiber net layer, the average fineness of the polyester staple fibers is 1.5 to 2.0D; the average fineness of nylon 66 short fibers is 1.5 to 3.0D.
6. The method of claim 1, wherein the method comprises the steps of: the method comprises the following steps:
step 1: respectively mixing, opening, cotton blending, carding and lapping first fibers, polyester staple fibers and nylon 66 staple fibers which are raw materials of the first fiber net layer to obtain a first fiber net layer; respectively mixing, opening, cotton mixing, carding and lapping the raw materials of the polyaroxadiazole fibers, the polyester staple fibers and the nylon 66 staple fibers of the third fiber net layer to obtain a third fiber net layer;
and 2, step: stacking a first fiber net layer, a second fabric reinforcing layer and a third fiber net layer in sequence; and (3) carrying out needle punching combination and post-processing to obtain the heat-resistant filter felt.
7. The method of claim 6 for making a heat resistant filter felt based on polyaryl oxadiazole fibers comprising: further processing the obtained heat-resistant filter felt to obtain a heat-resistant filter felt B;
the specific process comprises the following steps: placing the heat-resistant filter felt in ferric chloride solution, oscillating, dipping and drying; transferring to sodium hydroxide solution, oscillating, dipping and drying; obtaining a heat-resistant filter felt A;
soaking the heat-resistant filter felt A in polytetrafluoroethylene dispersion liquid, and carrying out oscillation soaking and rolling; transferring to dopamine mixed solution, oscillating, dipping and rolling; drying and shaping to obtain the heat-resistant filter felt B.
8. The method of claim 7 for making a heat resistant filter felt based on polyaryl oxadiazole fibers comprising: the ferric chloride solution is a ferric chloride-dichloromethane solution with the concentration of 0.8 to 1.2 wt%; the concentration of the sodium hydroxide solution is 2mol/L; the polytetrafluoroethylene dispersion liquid is a solution of modified polytetrafluoroethylene-deionized water with the concentration of 4-6 wt%; the dopamine mixed solution is obtained by mixing an ethyl silicate-ethanol solution with the volume ratio of 1 to 0.28 to 0.32wt% of dopamine solution.
9. The method of making a heat resistant filter mat based on polyaryl oxadiazole fibers of claim 8, wherein: the preparation method of the modified polytetrafluoroethylene comprises the following steps: dispersing a dopamine solution with the concentration of 0.18 to 0.22wt% and a polyethyleneimine solution in deionized water, and adjusting the pH to be 9.7 to 10.2; adding polytetrafluoroethylene, homogenizing, washing and drying; and transferring the mixture into a phosphorus oxychloride solution, stirring, washing and drying to obtain the modified polytetrafluoroethylene.
10. The use of a heat resistant filter felt based on polyaryl oxadiazole fibers according to any one of claims 1 to 9, wherein the heat resistant filter felt comprises: the heat-resistant filter felt is sewn by three needles or hot melt to prepare a filter bag, and is applied to the fields of asphalt mixing plants and cement kilns.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203075755U (en) * | 2012-12-31 | 2013-07-24 | 上海博格工业用布有限公司 | PODLON fiber high-temperature-resistant filtered punched felt |
| CN103933784A (en) * | 2014-04-09 | 2014-07-23 | 东华大学 | Preparation method of durable oil-repellant fiber filtration material |
| CN103949115A (en) * | 2014-05-22 | 2014-07-30 | 福州大学 | Method for generating denitration catalyst on filter material in situ |
| CN111974090A (en) * | 2020-08-19 | 2020-11-24 | 闽江学院 | Preparation method of static-free high-efficiency filter fiber material |
| CN112973284A (en) * | 2021-02-26 | 2021-06-18 | 冯阳 | High-temperature-resistant filtering material |
| CN113329802A (en) * | 2018-11-16 | 2021-08-31 | 日铁矿业株式会社 | Coating liquid |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203075755U (en) * | 2012-12-31 | 2013-07-24 | 上海博格工业用布有限公司 | PODLON fiber high-temperature-resistant filtered punched felt |
| CN103933784A (en) * | 2014-04-09 | 2014-07-23 | 东华大学 | Preparation method of durable oil-repellant fiber filtration material |
| CN103949115A (en) * | 2014-05-22 | 2014-07-30 | 福州大学 | Method for generating denitration catalyst on filter material in situ |
| CN113329802A (en) * | 2018-11-16 | 2021-08-31 | 日铁矿业株式会社 | Coating liquid |
| CN111974090A (en) * | 2020-08-19 | 2020-11-24 | 闽江学院 | Preparation method of static-free high-efficiency filter fiber material |
| CN112973284A (en) * | 2021-02-26 | 2021-06-18 | 冯阳 | High-temperature-resistant filtering material |
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Denomination of invention: A Heat-resistant Filter Felt Based on Polyaryloxadiazole Fiber and Its Preparation Method Effective date of registration: 20230627 Granted publication date: 20221230 Pledgee: Bank of Jiangsu Co.,Ltd. Taizhou Branch Pledgor: JIANGSU AOKAI ENVIRONMENT TECHNOLOGY Co.,Ltd. Registration number: Y2023980045798 |