High strength easy clean composite filter bag and method of making same

Abstract

This invention discloses a high-strength, easy-to-clean composite filter bag and its preparation method, belonging to the field of filter bag processing technology. This invention addresses the technical problems of existing filter bags easily forming difficult-to-clean oil and dirt deposits, high cleaning difficulty, and the need for further improvement in the heat resistance and mechanical properties of traditional filter bags. The preparation method of the high-strength, easy-to-clean composite filter bag includes the following steps: adding butyl acrylate, 1,2-epoxy-7-octene, toluene, and a catalyst into a three-necked flask and stirring; raising the temperature of the three-necked flask to 70-80°C and maintaining the reaction temperature for 4-6 hours; and then performing post-treatment to obtain a polyolefin. This invention not only effectively improves the heat resistance and mechanical properties of the composite filter bag but also enhances its hydrophobic and oleophobic properties, preventing the adhesion of large amounts of difficult-to-clean dirt and facilitating cleaning.

Description

Technical Field

[0001] This invention relates to the field of filter bag processing technology, specifically to high-strength, easy-to-clean composite filter bags and their preparation methods. Background Technology

[0002] Filter bags are a crucial component in the operation of baghouse dust collectors. Also known as dust collection bags, dust bags, dust filter bags, dust collection bags, dust collector bags, etc., filter bags are widely used in industrial and environmental applications for solid-liquid separation, particulate matter capture, and pollutant removal.

[0003] Existing filter bags mainly include cellulose-based filter bags and polymer filter bags. In industrial high-pollution production environments, when filtering gases containing oil or water, these oil and water impurities easily adhere to the filter bags, forming difficult-to-clean oil stains. Furthermore, industrial production is usually accompanied by high temperatures, and traditional filter bags have poor heat resistance and are easily deformed in high-temperature environments. Traditional filter bags are also easily damaged under high pressure and high temperature environments, often requiring frequent replacement, which increases operation and maintenance costs.

[0004] To address this technical deficiency, a solution is proposed. Summary of the Invention

[0005] The purpose of this invention is to provide a high-strength, easy-to-clean composite filter bag and its preparation method, in order to solve the technical problems in the prior art where filter bags are used in industrial high-pollution production environments, and pollutants that are difficult to clean are easily formed on the filter bags, making cleaning difficult. In addition, traditional filter bags have poor heat resistance and mechanical properties, are easily damaged under high pressure and high temperature environments, and often need to be replaced frequently, which increases the operating and maintenance costs.

[0006] The objective of this invention can be achieved through the following technical solutions:

[0007] A method for preparing a high-strength, easy-to-clean composite filter bag includes the following steps:

[0008] S1. Add butyl acrylate, 1,2-epoxy-7-octene, toluene and catalyst to a three-necked flask and stir. Raise the temperature of the three-necked flask to 70-80℃ and keep it at that temperature for 4-6 hours. Then, after processing, polyolefin is obtained.

[0009] The principle of polyolefin synthesis reaction is as follows:

[0010]

[0011] S2. Add polybutylene terephthalate, polyolefin and polyethylene glycol to a torque rheometer, set the torque rheometer temperature to 240-250℃, and melt mix for 30-40 minutes to obtain a mixture;

[0012] S3. Transfer the mixture to a melt spinning machine for melt spinning to obtain spun fibers, and then spin the spun fibers into yarn by spinning.

[0013] S4. Immerse the yarn completely in the modified solution at room temperature for 15-20 seconds, then transfer it to a drying oven at 75-85℃ to dry and shape it to obtain the composite yarn.

[0014] S5. Using composite yarn as raw material, a weaving machine is used to weave it into filter bag fabric using a twill weave method. The filter bag fabric is then cut and sewn to prepare composite filter bags.

[0015] Further, in step S1, the ratio of butyl acrylate, 1,2-epoxy-7-octene, toluene, and catalyst is 8g:5g:30mL:0.1g. The catalyst is one of azobisisobutyronitrile and potassium persulfate. The post-treatment operation includes: after the reaction is complete, the temperature of the three-necked flask is lowered to room temperature, purified water is added to the three-necked flask, the mixture is stirred for 20-30 minutes, allowed to stand and separate, the organic phase is transferred to a rotary evaporator, the water bath temperature is set to 80-90℃, and the solvent is removed by vacuum evaporation to obtain polyolefin.

[0016] Furthermore, in step S2, the ratio of polybutylene terephthalate, polyolefin, and polyethylene glycol is 9g:2g:2g.

[0017] Furthermore, in step S3, the nozzle size of the melt spinning machine is 0.3 mm, the melting temperature is set to 255-265℃, the extrusion speed is 2.3-2.9 kg / h, the spinning pressure is 12-14 bar, the traction force is 1.3-1.7 N, the stretching speed is 2600-2800 m / min, and the stretching ratio is 3.4-3.8. The melt spinning machine uses cold air at 15-25℃ for cooling and forming, and the cold air flow rate is 45-55 L / min.

[0018] Furthermore, the modified liquid in step S4 is prepared as follows: tetraethoxysilane, triethoxysilane, heptadecafluorodecyltriethoxysilane and anhydrous ethanol are added to a three-necked flask and stirred evenly. The temperature of the three-necked flask is raised to 55-65℃, an emulsion is added to the three-necked flask, and the reaction is kept at this temperature for 2-3 hours. After post-treatment, the modified liquid is obtained.

[0019] Furthermore, the ratio of tetraethoxysilane, triethoxysilane, heptadecafluorodecyltriethoxysilane, anhydrous ethanol, and emulsion is 5g:2g:1g:15mL:10g. The post-treatment operation includes: after the reaction is complete, keeping the three-necked flask at 55-65℃, removing the ethanol under reduced pressure, and lowering the temperature of the three-necked flask to room temperature to obtain the modified solution.

[0020] Furthermore, the emulsion is composed of purified water, waterborne acrylic resin, emulsifier, stabilizer, and 10wt% ammonia in a dosage ratio of 10mL:3g:1.5g:0.6g:3mL. The emulsifier is composed of sodium dodecyl sulfate and Tween-80 in a dosage ratio of 1g:1g, and the stabilizer is one or more of sodium carboxymethyl cellulose, polyethylene glycol, and sodium polyacrylate.

[0021] A high-strength and easy-to-clean composite filter bag is prepared by weaving composite yarn into filter bag fabric through a spinning machine, and then cutting and sewing the filter bag fabric.

[0022] The composite fiber is prepared by impregnating fibers with a modified liquid.

[0023] The present invention has the following beneficial effects:

[0024] 1. During processing, the composite filter bag of the present invention undergoes a free radical reaction initiated by butyl acrylate and 1,2-epoxy-7-octene catalysts to generate a condensation polymer. This polymer is then mixed with polybutylene terephthalate and polyethylene glycol at high temperature. At high temperature, the active functional groups hydroxyl and carboxyl groups on polybutylene terephthalate and polyethylene glycol can react with the epoxy groups on the polyolefin molecules. Furthermore, in a high-temperature environment, transesterification reactions can occur between the ester groups on polybutylene terephthalate and the hydroxyl groups in polyethylene glycol, forming a stable cross-linked structure in the mixture, increasing the degree of cross-linking, and forming a stable network structure. By optimizing the melt spinning parameters, the mechanical properties and thermal stability of the spun fibers are improved.

[0025] 2. During the processing of the composite filter bag of the present invention, tetraethoxysilane, triethoxysilane, and heptadecafluorodecyltriethoxysilane react in an alkaline emulsifying environment. After the siloxane bonds on the molecules break to form silanol groups, they condense to generate a molecular additive with siloxane-silicon crosslinking. This additive is uniformly dispersed in the emulsifying environment and uniformly mixed with water-based acrylic resin to prepare a modified liquid. By impregnating the yarn with the modified liquid, the crosslinking degree of the multi-strand spinning fibers that make up the yarn can be improved, thereby improving the mechanical properties of spinning. At the same time, the heptadecafluorodecyl modification additive has good hydrophobic and oleophobic properties, which can effectively improve the surface oleophobic and hydrophobic properties of the composite fiber. This helps the yarn maintain good performance in a humid environment, reduces the adhesion of oily substances, and thus improves the anti-fouling performance of the composite filter bag, making it easier to clean the filter bag. Detailed Implementation

[0026] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] Example 1

[0028] This embodiment provides a method for preparing a high-strength, easy-to-clean composite filter bag, comprising the following steps:

[0029] S1. Weigh out 40g of butyl acrylate, 25g of 1,2-epoxy-7-octene, 150mL of toluene, and 0.5g of azobisisobutyronitrile and add them to a three-necked flask. Stir the mixture and raise the temperature of the three-necked flask to 70℃. Keep the mixture at this temperature for 4 hours. Then lower the temperature of the three-necked flask to room temperature, add purified water to the flask, stir for 20 minutes, let it stand and separate the liquids. Transfer the organic phase to a rotary evaporator, set the water bath temperature to 80℃, and remove the solvent under reduced pressure to obtain polyolefin.

[0030] S2. Weigh out 450g of polybutylene terephthalate, 100g of polyolefin and 100g of polyethylene glycol (PEG-200) and add them to the torque rheometer. Set the torque rheometer temperature to 240℃ and melt mix for 30min to obtain the mixture.

[0031] The mixture is transferred to a melt spinning machine with a nozzle size of 0.3 mm, a melting temperature of 255℃, an extrusion speed of 2.3 kg / h, a spinning pressure of 12 bar, a traction force of 1.3 N, a stretching speed of 2600 m / min, and a stretching ratio of 3.4. The melt spinning machine uses 15℃ cold air for cooling and molding, with a cold air flow rate of 45 L / min. The melt spinning process yields spun fibers, which are then spun into yarn through spinning.

[0032] S3. Weigh out 40 mL of purified water, 12 g of water-based acrylic resin, 3 g of sodium dodecyl sulfate, 3 g of Tween-80, 2.4 g of sodium carboxymethyl cellulose, and 12 mL of 10 wt% ammonia water. Add them to a beaker and mix well to obtain an emulsion.

[0033] Weigh out 20g of tetraethoxysilane, 8g of triethoxysilane, 4g of heptadecafluorodecyltriethoxysilane, and 60mL of anhydrous ethanol and add them to a three-necked flask. Stir well and raise the temperature of the three-necked flask to 55℃. Add 40g of emulsion to the three-necked flask and keep it at this temperature for 2 hours. Keep the temperature of the three-necked flask at 55℃ and remove the ethanol under reduced pressure. Lower the temperature of the three-necked flask to room temperature to obtain the modified solution.

[0034] S4. Immerse the yarn completely in the modified solution at room temperature for 15 seconds, then transfer it to a drying oven at 75°C to dry and shape it to obtain the composite yarn.

[0035] S5. Using composite yarn as raw material, a weaving machine is used to weave it into filter bag fabric using a twill weave method. The filter bag fabric is then cut and sewn to prepare composite filter bags.

[0036] Example 2

[0037] This embodiment provides a method for preparing a high-strength, easy-to-clean composite filter bag, comprising the following steps:

[0038] S1. Weigh 40g of butyl acrylate, 25g of 1,2-epoxy-7-octene, 150mL of toluene, and 0.5g of potassium persulfate into a three-necked flask and stir. Raise the temperature of the three-necked flask to 75℃ and keep it at that temperature for 5h. Then lower the temperature of the three-necked flask to room temperature, add purified water to the three-necked flask, stir for 25min, let it stand and separate the liquids. Transfer the organic phase to a rotary evaporator, set the water bath temperature to 85℃, and remove the solvent under reduced pressure to obtain polyolefin.

[0039] S2. Weigh out 450g of polybutylene terephthalate, 100g of polyolefin and 100g of polyethylene glycol (PEG-200) and add them to the torque rheometer. Set the torque rheometer temperature to 245℃ and melt mix for 35 minutes to obtain the mixture.

[0040] The mixture is transferred to a melt spinning machine with a nozzle size of 0.3 mm, a melting temperature of 260℃, an extrusion speed of 2.6 kg / h, a spinning pressure of 13 bar, a traction force of 1.5 N, a stretching speed of 2700 m / min, and a stretch ratio of 3.6. The melt spinning machine uses 20℃ cold air for cooling and molding, with a cold air flow rate of 50 L / min. The melt spinning process yields spun fibers, which are then spun into yarn through spinning.

[0041] S3. Weigh out: 40 mL of purified water, 12 g of water-based acrylic resin, 3 g of sodium dodecyl sulfate, 3 g of Tween-80, 2.4 g of polyethylene glycol, and 12 mL of 10 wt% ammonia water. Add them to a beaker and mix well to obtain an emulsion.

[0042] Weigh out 20g of tetraethoxysilane, 8g of triethoxysilane, 4g of heptadecafluorodecyltriethoxysilane, and 60mL of anhydrous ethanol and add them to a three-necked flask. Stir well and raise the temperature of the three-necked flask to 60℃. Add 40g of emulsion to the three-necked flask and keep the reaction at this temperature for 2.5h. Keep the temperature of the three-necked flask at 60℃ and remove the ethanol under reduced pressure. Lower the temperature of the three-necked flask to room temperature to obtain the modified solution.

[0043] S4. Immerse the yarn completely in the modified solution at room temperature for 17 seconds, then transfer it to a drying oven at 80°C to dry and shape it to obtain the composite yarn.

[0044] S5. Using composite yarn as raw material, a weaving machine is used to weave it into filter bag fabric using a twill weave method. The filter bag fabric is then cut and sewn to prepare composite filter bags.

[0045] Example 3

[0046] This embodiment provides a method for preparing a high-strength, easy-to-clean composite filter bag, comprising the following steps:

[0047] S1. Weigh out 40g of butyl acrylate, 25g of 1,2-epoxy-7-octene, 150mL of toluene, and 0.5g of azobisisobutyronitrile and add them to a three-necked flask. Stir the mixture and raise the temperature of the three-necked flask to 80℃. Keep the mixture at this temperature for 6 hours. Then lower the temperature of the three-necked flask to room temperature, add purified water to the flask, stir for 30 minutes, let it stand and separate the liquids. Transfer the organic phase to a rotary evaporator, set the water bath temperature to 90℃, and remove the solvent under reduced pressure to obtain polyolefin.

[0048] S2. Weigh out 450g of polybutylene terephthalate, 100g of polyolefin and 100g of polyethylene glycol (PEG-200) and add them to the torque rheometer. Set the torque rheometer temperature to 250℃ and melt mix for 40min to obtain the mixture.

[0049] The mixture is transferred to a melt spinning machine with a nozzle size of 0.3 mm, a melting temperature of 265℃, an extrusion speed of 2.9 kg / h, a spinning pressure of 14 bar, a traction force of 1.7 N, a stretching speed of 2800 m / min, and a stretch ratio of 3.8. The melt spinning machine uses 25℃ cold air for cooling and molding, with a cold air flow rate of 55 L / min. The melt spinning process yields spun fibers, which are then spun into yarn through spinning.

[0050] S3. Weigh out 40 mL of purified water, 12 g of water-based acrylic resin, 3 g of sodium dodecyl sulfate, 3 g of Tween-80, 2.4 g of sodium polyacrylate, and 12 mL of 10 wt% ammonia water. Add them to a beaker and mix well to obtain an emulsion.

[0051] Weigh out 20g of tetraethoxysilane, 8g of triethoxysilane, 4g of heptadecafluorodecyltriethoxysilane, and 60mL of anhydrous ethanol and add them to a three-necked flask. Stir well and raise the temperature of the three-necked flask to 65℃. Add 40g of emulsion to the three-necked flask and keep it at this temperature for 3 hours. Keep the temperature of the three-necked flask at 65℃ and remove the ethanol under reduced pressure. Lower the temperature of the three-necked flask to room temperature to obtain the modified solution.

[0052] S4. Immerse the yarn completely in the modified solution at room temperature for 20 seconds, then transfer it to a drying oven at 85°C to dry and shape it to obtain the composite yarn.

[0053] S5. Using composite yarn as raw material, a weaving machine is used to weave it into filter bag fabric using a twill weave method. The filter bag fabric is then cut and sewn to prepare composite filter bags.

[0054] Comparative Example 1

[0055] The difference between this comparative example and Example 1 is that step S1 is omitted and polyolefin is not added in step S2.

[0056] Comparative Example 2

[0057] The difference between this comparative example and Example 1 is that step S3 is omitted, and the composite yarn in step S4 is replaced by the yarn obtained in step S2.

[0058] Comparative Example 3

[0059] The difference between this comparative example and Example 1 is that heptadecafluorodecyltriethoxysilane was not added in step S3.

[0060] Performance testing:

[0061] The strength, stain resistance, and high-temperature resistance of the composite filter bags prepared in Examples 1-3 and Comparative Examples 1-3 were tested. The strength was tested according to standard GB / T 3923.1-2013 "Textiles - Tensile Properties of Fabrics - Part 1: Determination of Breaking Strength and Elongation at Break (Strip Method)". The stain resistance was tested according to standard DB44 / T1872-2016 "Determination of Surface Wetting Properties of Textiles - Contact Angle Method" by measuring the static contact angle between the samples and water and oil. The high-temperature resistance test involved placing the samples in an oven at 150℃ for 30 minutes and measuring their dimensional change rate. The specific test results are as follows:

[0062]

[0063] Data Analysis:

[0064] By comparing and analyzing the data in the table above, we can see that:

[0065] 1) The composite filter bag prepared by the present invention has a tensile strength of 970.3 N, a breaking elongation of 12.8%, and a dimensional change rate of 0.5%, indicating that the composite filter bag prepared by the present invention has excellent tensile strength, mechanical stability, and high temperature resistance.

[0066] 2) The composite filter bag prepared by the present invention has a static contact angle of 135.9° with water and a contact angle of 142.8° with oil, indicating that the composite filter bag prepared by the present invention has excellent oleophobic and hydrophobic properties, which can effectively reduce the adhesion of oily or watery substances on the composite filter bag, improve its own anti-fouling performance, and facilitate cleaning.

[0067] 3) The test data of Examples 1-3 of the present invention are all better than the test data of Comparative Examples 1-3, and the test data of the composite filter bags prepared in Examples 1-3 of the present invention are stable, indicating that the preparation method of the composite filter bags of the present invention is stable and improves the mechanical properties and oil-resistant and hydrophobic properties of the composite filter bags.

[0068] The above description is merely an example and illustration of the structure of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described, or use similar methods to replace them, as long as they do not deviate from the structure of the invention or exceed the scope defined in the claims, all of which should fall within the protection scope of the present invention.

[0069] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0070] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to specific implementations. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A method for preparing a high-strength, easy-to-clean composite filter bag, characterized in that, Includes the following steps: S1. Add butyl acrylate, 1,2-epoxy-7-octene, toluene and catalyst to a three-necked flask and stir. Raise the temperature of the three-necked flask to 70-80℃ and keep it at that temperature for 4-6 hours. Then, after processing, polyolefin is obtained. S2. Add polybutylene terephthalate, polyolefin and polyethylene glycol to a torque rheometer, set the torque rheometer temperature to 240-250℃, and melt mix for 30-40 minutes to obtain a mixture; S3. Transfer the mixture to a melt spinning machine for melt spinning to obtain spun fibers, and then spin the spun fibers into yarn by spinning. S4. Completely immerse the yarn in the modification solution at room temperature for 15-20 seconds, then transfer it to a drying oven at 75-85℃ for drying and shaping to obtain composite yarn. The modification solution is prepared by adding tetraethoxysilane, triethoxysilane, heptadecafluorodecyltriethoxysilane and anhydrous ethanol to a three-necked flask and stirring until homogeneous. The temperature of the three-necked flask is raised to 55-65℃, and an emulsion is added to the three-necked flask. The reaction is maintained at this temperature for 2-3 hours, and then post-treated to obtain the modified solution. S5. Using composite yarn as raw material, a weaving machine is used to weave it into filter bag fabric using a twill weave method. The filter bag fabric is then cut and sewn to prepare composite filter bags.

2. The method for preparing the high-strength, easy-to-clean composite filter bag according to claim 1, characterized in that, In step S1, the ratio of butyl acrylate, 1,2-epoxy-7-octene, toluene, and catalyst is 8g:5g:30mL:0.1g. The catalyst is one of azobisisobutyronitrile and potassium persulfate. The post-treatment includes: after the reaction is complete, the temperature of the three-necked flask is lowered to room temperature, purified water is added to the three-necked flask, the mixture is stirred for 20-30 minutes, allowed to stand and separate, the organic phase is transferred to a rotary evaporator, the water bath temperature is set to 80-90℃, and the solvent is removed by vacuum evaporation to obtain polyolefin.

3. The method for preparing the high-strength, easy-to-clean composite filter bag according to claim 1, characterized in that, In step S2, the ratio of polybutylene terephthalate, polyolefin, and polyethylene glycol is 9g:2g:2g.

4. The method for preparing the high-strength, easy-to-clean composite filter bag according to claim 1, characterized in that, In step S3, the nozzle size of the melt spinning machine is 0.3 mm, the melting temperature is set to 255-265℃, the extrusion speed is 2.3-2.9 kg / h, the spinning pressure is 12-14 bar, the traction force is 1.3-1.7 N, the stretching speed is 2600-2800 m / min, and the stretching ratio is 3.4-3.

8. The melt spinning machine uses cold air at 15-25℃ for cooling and forming, and the cold air flow rate is 45-55 L / min.

5. The method for preparing the high-strength, easy-to-clean composite filter bag according to claim 1, characterized in that, The ratio of tetraethoxysilane, triethoxysilane, heptadecafluorodecyltriethoxysilane, anhydrous ethanol, and emulsion is 5g:2g:1g:15mL:10g. The post-treatment includes: after the reaction is complete, keeping the three-necked flask at 55-65℃, removing the ethanol under reduced pressure, and lowering the temperature of the three-necked flask to room temperature to obtain the modified solution.

6. The method for preparing the high-strength, easy-to-clean composite filter bag according to claim 1, characterized in that, The emulsion is composed of purified water, water-based acrylic resin, emulsifier, stabilizer, and 10wt% ammonia in a ratio of 10mL:3g:1.5g:0.6g:3mL. The emulsifier is composed of sodium dodecyl sulfate and Tween-80 in a ratio of 1g:1g. The stabilizer is one or more of sodium carboxymethyl cellulose, polyethylene glycol, and sodium polyacrylate.

7. A high-strength, easy-to-clean composite filter bag, prepared by the method for preparing a high-strength, easy-to-clean composite filter bag as described in any one of claims 1-6, characterized in that, Composite filter bags are made by weaving composite yarns into filter bag fabric using a spinning machine, and then cutting and sewing the filter bag fabric. The composite yarn is prepared by spinning yarn from spun fibers and then modifying it by impregnation with a modified liquid.

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