PTFE hollow fiber membrane material for decarbonization of ship exhaust gas

Abstract

The present application relates to the technical field of hollow fiber membrane, and proposes a PTFE hollow fiber membrane material for ship flue gas decarburization, which comprises the following components by weight: 90-100 parts of polytetrafluoroethylene resin powder, 15-30 parts of lubricant, 6-8 parts of sodium dodecyl benzene sulfonate, and 3-4 parts of 3-sulfopropyl methacrylate potassium salt. Through the above technical solution, the problem of low porosity and easy breakage of the PTFE hollow fiber membrane in the prior art is solved.

Description

Technical Field

[0001] This invention relates to the field of hollow fiber membrane technology, specifically to a PTFE hollow fiber membrane material for decarbonization of ship flue gas. Background Technology

[0002] Theoretically, methods for removing carbon dioxide from ship exhaust gas include absorption separation, adsorption, membrane separation, membrane absorption, and cryogenic distillation. Among these, membrane absorption is widely valued for its high efficiency, simplicity, low energy consumption, and pollution-free operation in ship exhaust gas decarbonization. Polytetrafluoroethylene (PTFE) possesses excellent chemical stability, high-temperature resistance, and electrical insulation properties, making it an ideal material in the field of membrane technology.

[0003] Currently, in order to obtain PTFE hollow fiber membranes with high porosity and suitable pore size, the membrane is usually subjected to post-stretching treatment. However, due to the low mechanical properties of the fiber membrane, it is easy to cause the fiber membrane to break. Summary of the Invention

[0004] This invention proposes a PTFE hollow fiber membrane material for decarbonization of ship flue gas, which solves the problems of low porosity and easy breakage of PTFE hollow fiber membranes in related technologies.

[0005] The technical solution of the present invention is as follows: This invention proposes a PTFE hollow fiber membrane material for decarbonizing ship flue gas, comprising the following raw materials in parts by weight: 90-100 parts polytetrafluoroethylene resin powder, 15-30 parts lubricant, 6-8 parts sodium dodecylbenzene sulfonate, and 3-4 parts potassium propyl 3-sulfonate methacrylate.

[0006] As a further technical solution, the raw materials also include 2-3 parts of sodium octylphenol polyether-2 ethanesulfonate.

[0007] As a further technical solution, the mass ratio of potassium propyl methacrylate 3-sulfonate to sodium octylphenol polyether-2-ethanesulfonate is 1~2:1.

[0008] As a further technical solution, the mass ratio of potassium propyl methacrylate 3-sulfonate to sodium octylphenol polyether-2-ethanesulfonate is 1.5:1.

[0009] This invention has found that when the mass ratio of potassium propyl methacrylate 3-sulfonate to sodium octylphenol polyether-2-ethanesulfonate is 1.5:1, the processing performance can be improved, resulting in PTFE hollow fiber membranes with higher porosity, tensile strength, and elongation at break.

[0010] As a further technical solution, the lubricant includes one of liquid paraffin, petroleum ether, and kerosene.

[0011] This invention also includes a method for preparing a PTFE hollow fiber membrane for decarbonization of ship flue gas, comprising the following steps: S1. After mixing the raw materials evenly, let them stand to obtain a mixture; S2. After pressing the mixture into a cylindrical blank, it is extruded to obtain a PTFE hollow tube; S3. After stretching the PTFE hollow tube, shape it to obtain a PTFE hollow fiber membrane.

[0012] As a further technical solution, the temperature for standing in S1 is 30~40℃, and the standing time is 24~30h.

[0013] As a further technical solution, the extrusion temperature in S2 is 100~200℃, and the extrusion speed is 100~300cm / min.

[0014] As a further technical solution, the stretching in S3 is a transverse stretching.

[0015] As a further technical solution, the lateral stretching ratio is 6 to 8.

[0016] As a further technical solution, the setting temperature in S3 is 350~400℃, and the setting time is 60~80s.

[0017] The present invention also includes a PTFE hollow fiber membrane prepared by the method for preparing a PTFE hollow fiber membrane for decarbonization of ship flue gas.

[0018] The working principle and beneficial effects of this invention are as follows: 1. In this invention, the PTFE hollow fiber membrane material is composed of polytetrafluoroethylene resin powder, lubricant, sodium dodecylbenzene sulfonate and potassium propyl 3-sulfonate of methacrylate. The addition of potassium propyl 3-sulfonate of methacrylate improves the porosity, tensile strength and elongation at break of the PTFE hollow fiber membrane.

[0019] 2. In this invention, sodium octylphenol polyether-2-ethanesulfonate is also added to the PTFE hollow fiber membrane material. The addition of sodium octylphenol polyether-2-ethanesulfonate can not only further improve the porosity, tensile strength and elongation at break of the PTFE hollow fiber membrane, but also further improve the porosity, tensile strength and elongation at break of the PTFE hollow fiber membrane by limiting the mass ratio of sodium octylphenol polyether-2-ethanesulfonate to potassium propyl methacrylate 3-sulfonate. Detailed Implementation

[0020] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. 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 of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0021] In the following embodiments and comparative examples: Polytetrafluoroethylene resin powder: Daikin Japan F-106; Liquid paraffin: Maoming Petrochemical 26#; Petroleum ether: Petroleum ether 60~90, manufacturer: Shandong Rongsheng New Materials Co., Ltd.

[0022] Example 1 A method for preparing a PTFE hollow fiber membrane for decarbonization of ship flue gas includes the following steps: S1. Mix 90 parts of polytetrafluoroethylene resin powder, 15 parts of liquid paraffin, 6 parts of sodium dodecylbenzene sulfonate, and 2 parts of potassium propyl 3-sulfonate of methacrylate evenly, and let stand at 30°C for 30 hours to obtain a mixture. S2. After pressing the mixture into a cylindrical blank on a compactor, it is extruded through a pusher at an extrusion speed of 100cm / min and a temperature of 100℃ to obtain a PTFE hollow tube. S3. After transversely stretching the PTFE hollow tube (stretching ratio 5, stretching rate 300mm / min), place it in an oven at 350℃ for 80s to set, and then cool to obtain a PTFE hollow fiber membrane.

[0023] Example 2 A method for preparing a PTFE hollow fiber membrane for decarbonization of ship flue gas includes the following steps: S1. Mix 95 parts of polytetrafluoroethylene resin powder, 22 parts of petroleum ether, 7 parts of sodium dodecylbenzene sulfonate, and 2.5 parts of potassium propyl 3-sulfonate of methacrylate evenly, and let stand at 35°C for 26 hours to obtain a mixture. S2. After pressing the mixture into a cylindrical blank on a compactor, it is extruded through a pusher at an extrusion speed of 200 cm / min and a temperature of 150°C to obtain a PTFE hollow tube. S3. After transversely stretching the PTFE hollow tube (stretching ratio 6, stretching rate 400mm / min), place it in an oven at 380℃ for 70s to set, and then cool to obtain a PTFE hollow fiber membrane.

[0024] Example 3 A method for preparing a PTFE hollow fiber membrane for decarbonization of ship flue gas includes the following steps: S1. Mix 100 parts of polytetrafluoroethylene resin powder, 30 parts of liquid paraffin, 8 parts of sodium dodecylbenzene sulfonate, and 3 parts of potassium propyl 3-sulfonate of methacrylate evenly, and let stand at 40°C for 24 hours to obtain a mixture. S2. After pressing the mixture into a cylindrical blank on a compactor, it is extruded through a pusher at an extrusion speed of 300 cm / min and a temperature of 200°C to obtain a PTFE hollow tube. S3. After transversely stretching the PTFE hollow tube (stretching ratio 8, stretching rate 500mm / min), place it in an oven at 400℃ for 60s to set, and then cool to obtain a PTFE hollow fiber membrane.

[0025] Example 4 The only difference between this embodiment and Example 3 is that 3 parts of sodium octylphenol polyether-2 ethanesulfonate were added.

[0026] Example 5 The only difference between this embodiment and Example 4 is that the potassium salt of 3-methyl methacrylate is 3.6 parts and the sodium octylphenol polyether-2-ethanesulfonate is 2.4 parts.

[0027] Example 6 The only difference between this embodiment and Example 4 is that the potassium salt of 3-methyl methacrylate is 4 parts and the sodium octylphenol polyether-2-ethanesulfonate is 2 parts.

[0028] Comparative Example 1 The only difference between this comparative example and Example 4 is that potassium propyl 3-sulfonate methacrylate is not added.

[0029] Comparative Example 2 The only difference between this comparative example and Example 1 is that potassium propyl 3-sulfonate methacrylate is not added.

[0030] Test case The porosity of the PTFE hollow fiber membranes in Examples 1-6 and Comparative Examples 1-2 was determined according to the determination method in HY / T065-2002 "Polyvinylidene Fluoride Microporous Filter Membranes"; and the tensile strength and elongation at break were determined at room temperature using a SNAS CMT4204 microcomputer-controlled electronic universal testing machine with a clamping distance of 50 mm and a tensile rate of 10 mm / min. The test results are shown in Table 1.

[0031] Table 1. Performance test results of PTFE hollow fiber membranes in Examples 1-6 and Comparative Examples 1-2

[0032] Compared with Example 1, Comparative Example 2 did not add potassium propyl 3-sulfonate methacrylate. As a result, the porosity, tensile strength and elongation at break of the PTFE hollow fiber membrane in Comparative Example 2 were all lower than those in Example 1, indicating that adding potassium propyl 3-sulfonate methacrylate can improve the porosity, tensile strength and elongation at break of the PTFE hollow fiber membrane in this invention.

[0033] Compared with Example 4, Example 1 did not add sodium octylphenol polyether-2-ethanesulfonate, Comparative Example 1 did not add potassium propyl 3-methyl methacrylate, and Comparative Example 2 did not add potassium propyl 3-methyl methacrylate and sodium octylphenol polyether-2-ethanesulfonate. The results showed that the porosity, tensile strength, and elongation at break of the PTFE hollow fiber membranes in Example 1 and Comparative Examples 1-2 were all lower than those in Example 4. This indicates that adding sodium octylphenol polyether-2-ethanesulfonate can improve the porosity, tensile strength, and elongation at break of the PTFE hollow fiber membrane. Furthermore, the simultaneous addition of sodium octylphenol polyether-2-ethanesulfonate and potassium propyl 3-methyl methacrylate can further improve the porosity, tensile strength, and elongation at break of the PTFE hollow fiber membrane.

[0034] Compared with Example 4, Examples 5 and 6 changed the mass ratio of potassium propyl 3-sulfonate methacrylate and sodium octylphenol polyether-2-ethanesulfonate. The results showed that the porosity, tensile strength and elongation at break of the PTFE hollow fiber membrane in Example 5 were higher than those in Examples 4 and 6. This indicates that when the mass ratio of potassium propyl 3-sulfonate methacrylate to sodium octylphenol polyether-2-ethanesulfonate is 1.5:1, the porosity, tensile strength and elongation at break of the PTFE hollow fiber membrane can be further improved.

[0035] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for preparing a PTFE hollow fiber membrane for decarbonization of ship flue gas, characterized in that, Includes the following steps: S1. After mixing the raw materials for PTFE hollow fiber membrane for decarbonizing ship flue gas evenly, let it stand to obtain a mixture; S2. After pressing the mixture into a cylindrical blank, it is extruded to obtain a PTFE hollow tube; S3. After stretching the PTFE hollow tube, shape it to obtain a PTFE hollow fiber membrane. The stretching in S3 is a transverse stretching; The lateral stretching ratio is 6 to 8; The raw materials for the PTFE hollow fiber membrane material used for ship flue gas decarbonization include the following components by weight: 90-100 parts polytetrafluoroethylene resin powder, 15-30 parts lubricant, 6-8 parts sodium dodecylbenzene sulfonate, and 3-4 parts potassium propyl 3-sulfonate methacrylate.

2. The method for preparing a PTFE hollow fiber membrane material for ship flue gas decarbonization according to claim 1, characterized in that, The lubricant includes one of liquid paraffin, petroleum ether, and kerosene.

3. The method for preparing a PTFE hollow fiber membrane for decarbonization of ship flue gas according to claim 1, characterized in that, The settling temperature in S1 is 30~40℃, and the settling time is 24~30h.

4. The method for preparing a PTFE hollow fiber membrane for decarbonization of ship flue gas according to claim 1, characterized in that, The extrusion temperature in S2 is 100~200℃, and the extrusion speed is 100~300cm / min.

5. The method for preparing a PTFE hollow fiber membrane for decarbonization of ship flue gas according to claim 1, characterized in that, The setting temperature in S3 is 350~400℃, and the setting time is 60~80s.

6. The PTFE hollow fiber membrane material for ship flue gas decarbonization prepared by the preparation method according to any one of claims 1 to 5, characterized in that, The raw materials also include 2-3 parts of sodium octylphenol polyether-2 ethanesulfonate.

Images