Method for recycling waste PPS-PTFE filter material

Abstract

The application discloses a PPS / PTFE waste filter material recycling method and belongs to the filter material recycling field. The application discloses a PPS / PTFE waste filter material recycling method for manufacturing high-performance equipment structural members. The PPS / PTFE waste filter material is melted by using a hot melting method, and the melted PPS / PTFE material is processed to obtain a high-performance equipment structural member. The price of the equipment structural member is lower than that of the current product.

Description

Technical Field

[0001] This invention relates to the field of filter media recycling, and specifically to a method for recycling and utilizing waste PPS-PTFE filter media. Background Technology

[0002] PPS (polyphenylene sulfide) and PTFE (polytetrafluoroethylene) dust collector bags are favored by many industrial manufacturers due to their filtration efficiency of up to 99.99% for micron-sized dust, and are widely used in industries such as steel, cement, metallurgy, and chemicals. However, both PTFE and PPS materials are relatively expensive, resulting in a high price for these dust collector bags. To reduce production costs, recycling used dust collector bags is essential. However, PTFE is difficult to process in recycling technology; it is commonly known as the "King of Plastics" and remains unchanged even when boiled in aqua regia. Therefore, due to PTFE's exceptionally high chemical stability, current technologies cannot recycle it, and the only option is to store the used dust collector bags. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention proposes a method for recycling and utilizing waste PPS-PTFE filter media.

[0004] The objective of this invention can be achieved through the following technical solutions: A method for recycling PPS / PTFE filter media includes: The collected filter media is then washed. Dry the cleaned filter media to a moisture content of less than 5% (by weight); The polyphenylene sulfide and polytetrafluoroethylene blended filter media were pulverized using a fiber pulverizer to obtain the mixture; Stir 10 parts by weight of the mixture and 30-40 parts by weight of the separation liquid for 1-2 hours, then pour the mixture into a centrifuge for centrifugal separation. Pure PPS material after hot melt separation; waste PPS / PTFE mixed waste that cannot be separated by hot melt separation; The molten PPS / PTFE composite material was thoroughly stirred, and various raw materials were added to the melt as additives. The thoroughly mixed PPS / PTFE composite material is extruded to prepare the equipment structural parts required by the design. After immersing the structural component in 108 into the hot-melt PPS liquid, it is taken out and cooled to obtain a high-performance equipment structural component.

[0005] Optionally, the density of the separation liquid is greater than 1.36 g / m³. 3 And less than 2.22g / m 3 .

[0006] Optionally, the separation liquid includes dimethylformamide, acetone, sodium chloride, ionic surfactant, and water.

[0007] Optionally, the weight ratio of dimethylformamide, acetone, sodium chloride, and ionic surfactant in the separation liquid is (8-15):(2-4):(30-50):(9-15).

[0008] Optionally, the various raw materials are selected from BN, SiC, MoS2, PTFE, carbon fiber, glass beads, hollow glass beads, glass fiber, fly ash, carbon particles, and graphite.

[0009] Optionally, the cleaning solution may be agitated during the cleaning process.

[0010] Optionally, the pulverized particle size is less than 100 micrometers.

[0011] The beneficial effects of this invention are: By processing and reprocessing waste PPS / PTFE dust collector bags, high-performance structural components that meet design requirements are prepared, thus achieving the recycling of waste PPS / PTFE dust collector bags. The polymer composite prepared by this method exhibits high elongation at break. Attached Figure Description

[0012] The invention will now be further described with reference to the accompanying drawings.

[0013] Figure 1 A flowchart illustrating the method for utilizing PPS / PTFE waste filter media to fabricate high-performance equipment structural components for this application. Detailed Implementation

[0014] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. 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.

[0015] like Figure 1 As shown, the present invention provides a method for utilizing PPS / PTFE waste filter media to manufacture high-performance equipment structural components, comprising the following steps: 101: Collection, collecting and sorting used dust bags; 102: Cleaning, clean the collected dust bags; 103: Drying: Dry the cleaned dust bags until the moisture content is below 5% (by weight); 104: Crushing, the waste polyphenylene sulfide and polytetrafluoroethylene blended dust collector bags are crushed using a fiber crusher to obtain a mixture; 105: Centrifugal separation. Mix 10 parts by weight of the mixture and 30-40 parts by weight of the separation liquid for 1-2 hours, then pour into a centrifuge and centrifuge for 2-3 hours. The density of the separation liquid should be greater than 1.36 g / m³. 3 And less than 2.22g / m 3 The separation solution is prepared by mixing dimethylformamide, acetone, sodium chloride, ionic surfactant and water, and the weight ratio of dimethylformamide, acetone, sodium chloride and ionic surfactant in the separation solution is (8-15):(2-4):(30-50):(9-15). 106: Hot melt, pure PPS material after hot melt separation at 280℃; waste PPS / PTFE mixed waste that cannot be separated by hot melt at 330℃-350℃.

[0016] 107: Stirring process, the molten PPS / PTFE composite material is thoroughly stirred, and various raw materials are added to the melt as additives. The various raw materials are selected from BN, SiC, MoS2, PTFE, carbon fiber, glass beads, hollow glass beads, glass fiber, coal ash, carbon particles and graphite.

[0017] 108: Extrusion molding: The fully mixed PPS / PTFE composite material is extruded to prepare the equipment structural parts required by the design.

[0018] 109: Immerse the structural component from step 108 in the hot-melt PPS liquid, then remove and cool it to obtain a high-performance equipment structural component.

[0019] Under normal conditions, PPS has a melting point of 281℃ and PTFE has a melting point of 327℃. At 330℃-350℃, both PPS and PTFE are in a molten state.

[0020] Multiple raw materials are added to the PPS / PTFE melt to ensure thorough mixing of the melt and filler.

[0021] In the extrusion molding stage, select the mold of the designed model, and the extruded product meets the design requirements.

[0022] The tensile properties of textile fabrics are tested using the strip method for determining breaking strength and elongation at break, GB / T 3923.1-2013.

[0023] The elongation at break of the extruded samples was tested, and the results are as follows: The purpose of the above cleaning is to remove dust adhering to the dust bag; this can be done using distilled water. The purpose of pulverizing is to make the powder easier to heat-melt. During cleaning, the cleaning solution can be shaken to ensure a more thorough cleaning.

[0024] 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.

[0025] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A method for recycling PPS / PTFE filter media, characterized in that, include: The collected filter media is then washed; Dry the cleaned filter media to a moisture content of less than 5% by weight. The polyphenylene sulfide and polytetrafluoroethylene blended filter media were pulverized using a fiber pulverizer to obtain a mixture with a particle size of less than 100 micrometers. After stirring 10 parts by weight of the mixture and 30-40 parts by weight of the separation liquid for 1-2 hours, pour the mixture into a centrifuge for centrifugal separation. Pure PPS material after hot melt separation at 280℃; waste PPS / PTFE mixed waste that cannot be separated by hot melt at 330℃-350℃; The molten PPS / PTFE composite material was thoroughly stirred, and various raw materials were added to the melt as additives. The thoroughly mixed PPS / PTFE composite material is extruded to prepare the equipment structural parts required by the design. The extruded structural component is immersed in hot-melt PPS liquid and then cooled to obtain a high-performance equipment structural component.

2. The method for recycling PPS / PTFE waste filter media according to claim 1, characterized in that, The separation liquid includes dimethylformamide, acetone, sodium chloride, ionic surfactant, and water.

3. The method for recycling PPS / PTFE waste filter media according to claim 1, characterized in that, The weight ratio of dimethylformamide, acetone, sodium chloride, and ionic surfactant in the separation liquid is (8-15):(2-4):(30-50):(9-15).

4. The method for recycling PPS / PTFE waste filter media according to claim 1, characterized in that, The various raw materials are selected from BN, SiC, MoS2, PTFE, carbon fiber, hollow glass beads, glass fiber, fly ash, carbon particles and graphite.

5. The method for recycling PPS / PTFE waste filter media according to claim 1, characterized in that, In the step of cleaning the collected filter media, the cleaning solution is agitated during the cleaning process.

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