Preparation method of high-efficiency oil-gas separation filter material

Abstract

The application relates to a preparation method of high-efficiency oil-gas separation filter material and relates to the technical field of filter material processing; the method comprises the steps of preparing modified oil-gas separation inner layer slurry and dispersing the modified oil-gas separation inner layer slurry, the composition ratio of the oil-gas separation inner and outer layer slurries is optimized, the slurry dispersion process and the drying and solidification process are optimized, the problem that the oil-gas separation outer layer slurry is easy to cause hole blocking and leads to the decline of the filtering performance of the oil-gas separation inner layer is solved, the filtering efficiency of 0.3-micron particles is higher, the filtering resistance under the flow rate of 5-20 cm / s is smaller, and therefore the overall filtering performance of the oil-gas separation filter material is improved; and after optimization, the water resistance of the oil-gas separation outer layer reaches level 12, the environmental durability is good, and the use requirement of a more harsh environment can be met.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of glass fiber material processing, and particularly relates to a preparation method of high-efficiency oil-gas separation filter material. BACKGROUND

[0002] Glass fiber is a very good metal material substitute, with the continuous development of national economy, glass fiber has become an indispensable raw material in the construction, transportation, electronics, electrical, chemical, metallurgy, environmental protection, national defense and other industries. The rapid development of China's glass fiber industry in recent years is driven by the pull of domestic and foreign markets. The expansion of the international market is due to both the growth of total demand and the space left for domestic enterprises in the international market after international companies exited the industry due to low profit margins; the growth of the domestic market is due to the rapid development of downstream consumer industries. China's glass fiber industry has grown significantly over the past 50 years. In the long run, the strengthening and renovation of infrastructure in the Middle East and Asia-Pacific region will increase the demand for glass fiber. As the demand for glass fiber in modified plastics, sports equipment, aerospace and other fields continues to grow, the industry has a promising future. Currently, the key technologies for high-end glass fiber filter materials are controlled by a few companies in Europe and the United States. The gap in products is mainly in terms of filtration efficiency, air intake resistance, and service life, etc. This is an innovative system integration work involving papermaking, machinery, aerosol, fluid mechanics, fiber physical chemistry, and high polymer chemistry. Glass fiber filter material is the core material of clean room high-efficiency filters, and is the core foundation support for the development of the electronics industry (integrated circuits, new displays, solar cells, semiconductor lighting, etc.), the medical industry (pharmaceuticals and equipment, and hospitals), food processing, aerospace, and precision manufacturing industries. The total annual demand for air filtration, hydraulic filtration, and oil-gas separation in the field of gas turbine air filtration is 2000-4000 tons, with a product gross profit of about 80%. Taking natural gas terminal sales (gas stations) as an example, there are currently about 32,000 gas stations nationwide. During the process of refueling at gas stations, oil in natural gas has become an industry-wide problem. The market size of oil-gas separation filter cartridges at gas stations is about 300-500 million yuan / year, which corresponds to about 60-80 million yuan / year of glass fiber filter material. This type of sub-market can use the direct production and sales of filter cartridges to maximize scale and profit. SUMMARY

[0003] In view of the deficiencies of the prior art, the present application aims to provide a preparation method of high-efficiency oil-gas separation filter material, which can effectively solve the problem that the outer layer slurry of the oil-gas separation filter material is easy to cause hole blockage and lead to a decrease in the filtration performance of the inner layer of the oil-gas separation filter material, thereby improving the overall filtration performance of the oil-gas separation filter material, and the water resistance of the outer layer of the oil-gas separation filter material reaches level 12, and the environmental durability is good.

[0004] In order to achieve the above object, the technical scheme adopted by the present application is as follows: A preparation method of high-efficiency oil-gas separation filter material, comprising the following steps:

[0005] Step S1, preparation of modified oil-gas separation inner layer slurry:

[0006] Step S11: 50-55 parts by weight of glass fiber with a diameter of 3-5 μm, 40-45 parts by weight of glass fiber with a diameter of 8-10 μm, and 10-15 parts by weight of glass fiber with a diameter of 23-25 μm are mixed uniformly to obtain oil-gas separation inner layer mixed fiber;

[0007] Step S12: the oil-gas separation inner layer mixed fiber is taken and immersed in a first modification liquid for 5-8 h, taken out and dried to obtain the modified oil-gas separation inner layer slurry; the first modification liquid comprises, by weight: water: 100 parts, perfluoropolyether: 4-6 parts, silane coupling agent KH-500: 12-15 parts, silicone oil: 3-5 parts, and polyethylene glycol: 3-5 parts;

[0008] Step S2, dispersion of modified oil-gas separation inner layer slurry: the modified oil-gas separation inner layer slurry is sent to a disperser for beating and dispersion, the concentration of the modified oil-gas separation inner layer slurry is controlled at 6-8 wt%, and the dispersed inner layer slurry is obtained;

[0009] Step S3, preparation of modified oil-gas separation outer layer slurry:

[0010] Step S31: 50-55 parts by weight of sulfate wood pulp, 10-15 parts by weight of sulfite wood pulp, and 3-5 parts by weight of glass fiber with a diameter of 23-25 μm are mixed uniformly to obtain oil-gas separation outer layer slurry;

[0011] Step S32: the oil-gas separation outer layer slurry is taken and immersed in a second modification liquid for 90-110 min, taken out and dried to obtain the modified oil-gas separation outer layer slurry; the second modification liquid comprises, by weight: water: 100 parts, and polytetrafluoroethylene emulsion: 6-8 parts.

[0012] Step S4, dispersion of modified oil-gas separation outer layer slurry: the modified oil-gas separation outer layer slurry is put into a pulping device, the concentration of the modified oil-gas separation outer layer slurry is controlled at 10-13 wt%, and pulping and dispersion are carried out at a speed of 600-800 rpm for 20-25 min; then pulping is carried out at a speed of 1200-1500 rpm for 30-35 min to obtain dispersed outer layer slurry;

[0013] Step S5, slurry rushing and webbing, and dewatering and forming:

[0014] Step S51: evenly overflow the dispersed inner layer slurry to the wearing surface of the forming wire, and obtain a first wet paper web through first vacuum suction;

[0015] Step S52: apply waterproof and oil-proof sizing agent to the first wet paper web, and obtain a sized first wet paper web through second vacuum suction;

[0016] Step S53: evenly overflow the dispersed outer layer slurry on the surface of the sized first wet paper web, and obtain a wet paper sheet through third vacuum suction until the moisture content reaches 40-45%.

[0017] Step S6: perform a reinforcing modification treatment: freeze the wet paper sheet at -20 to -25°C for 20-24 hours, take it out, and stand it at room temperature, and then perform drying and curing on the wet paper sheet, thereby obtaining the high-efficiency oil-gas separation filter material.

[0018] Further, in step S11, 52-55 parts by weight of glass fibers with a diameter of 3-5 μm, 42-45 parts by weight of glass fibers with a diameter of 8-10 μm, and 13-15 parts by weight of glass fibers with a diameter of 23-25 μm are uniformly mixed to obtain the oil-gas separation inner layer mixed fibers.

[0019] Further, in step S12, the oil-gas separation inner layer mixed fibers are immersed in a first modification liquid for 6-8 hours, taken out, and dried to obtain the modified oil-gas separation inner layer slurry; the first modification liquid comprises, by weight: water: 100 parts, perfluoropolyether: 5-6 parts, silane coupling agent KH-500: 14-15 parts, silicone oil: 4-5 parts, polytetrafluoroethylene emulsion: 7-8 parts, and polyethylene glycol: 4-5 parts.

[0020] Further, in step S2, the modified oil-gas separation inner layer slurry is sent to a disperser for beating and dispersion, and the concentration of the modified oil-gas separation inner layer slurry is controlled at 7-8 wt% to obtain the dispersed inner layer slurry.

[0021] Further, in step S31, 52-55 parts by weight of sulfate wood pulp, 13-15 parts by weight of sulfite wood pulp, and 4-5 parts by weight of glass fibers with a diameter of 23-25 μm are uniformly mixed to obtain the oil-gas separation outer layer slurry.

[0022] Further, in step S32, the oil-gas separation outer layer slurry is immersed in a second modification liquid for 100-110 minutes, taken out, and dried to obtain the modified oil-gas separation outer layer slurry; the second modification liquid comprises, by weight: water: 100 parts, and hydrochloric acid: 7-8 parts.

[0023] Further, in the step S4, the modified oil-gas separation outer layer slurry is put into a pulping device, the concentration of the modified oil-gas separation outer layer slurry is controlled at 11-13wt%, and the pulping dispersion is carried out at a speed of 700-800rpm for 22-25min; then the pulping dispersion is carried out at a speed of 1300-1500rpm for 32-35min, to obtain the dispersed outer layer slurry.

[0024] Further, in the step S52, 100 parts by weight of the acrylic resin, 6-8 parts by weight of the fluorine-containing waterproof and oil-repellent agent, 0.5-0.8 parts by weight of the sulfonate anionic surfactant, and 0.4-0.6 parts by weight of the melamine are uniformly stirred to obtain the waterproof and oil-repellent sizing material.

[0025] Further, in the step S53, the dispersed outer layer slurry is uniformly overflowed on the surface of the sized first wet paper web, and the moisture content is controlled to 43-45% through third vacuum suction, to obtain the wet paper sheet.

[0026] Further, in the step S6, the wet paper sheet is frozen at-22 to-25℃ for 22-24h, taken out, and placed at room temperature, and then the wet paper sheet is dried and solidified, to obtain the high-efficiency oil-gas separation filter material.

[0027] The high-efficiency oil-gas separation filter material prepared by the preparation method has the following main technical indexes:

[0028] No. Property Unit Oil and gas separation inner layer Oil and gas separation outer layer 1 Quantitative g / m2 90 86.7 2 Air permeability mm / s 140 204-210 3 Longitudinal tensile strength kN / m 1.20 1.22 4 Thickness mm 0.43 0.35 5 0.3um filtration efficiency ％ 90.28％ 78.50％ 6 Filtration resistance Pa 88.6 56.8 7 Water resistance level --- 3 level 12 level 8 LOI ％ 5.7 4.7 .

[0029] The preparation method of the high-efficiency oil-gas separation filter material optimizes the composition and ratio of the oil-gas separation inner and outer layer slurries, the slurry dispersion process, and the drying and solidification process, solves the problem that the oil-gas separation outer layer slurry is easy to cause hole blocking and leads to the decline of the oil-gas separation inner layer filtration performance, has higher filtration efficiency for 0.3-micron particles, and has smaller filtration resistance at a flow rate of 5-20cm / s, so that the overall filtration performance of the oil-gas separation filter material is improved; and after optimization, the oil-gas separation outer layer has a water resistance grade of 12, has good environmental durability, and can meet the use requirements in more harsh environments. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 is a microstructure diagram of the inner layer of the high-efficiency oil-gas separation filter material prepared in the application, which is enlarged 1000 times;

[0031] Figure 2 is a microstructure diagram of the outer layer of the high-efficiency oil-gas separation filter material prepared in the application, which is enlarged 1000 times. DETAILED DESCRIPTION

[0032] The following examples can help those skilled in the art to more fully understand the present application, but can not limit the present application in any way.

[0033] The preparation method of the high-efficiency oil-gas separation filter material of the present application is shown in the following table 1.

[0034] Table 1

[0035]

[0036] The preparation method of the high-efficiency oil-gas separation filter material of the present application is shown in the following table 1.

[0037]

[0038]

[0039]

[0040] Example 1

[0041] The preparation method of the high-efficiency oil-gas separation filter material comprises the following steps:

[0042] Step S1, preparation of modified oil-gas separation inner layer slurry:

[0043] Step S11: take 50 parts by weight of glass fiber with a diameter of 3 μm, 40 parts by weight of glass fiber with a diameter of 8 μm, and 10 parts by weight of glass fiber with a diameter of 23 μm, mix uniformly to obtain oil-gas separation inner layer mixed fiber;

[0044] Step S12: take the oil-gas separation inner layer mixed fiber, immerse it in the first modification liquid for 5 h, take it out and dry to obtain the modified oil-gas separation inner layer slurry; the first modification liquid comprises, by weight: water: 100 parts, perfluoropolyether: 4-6 parts, silane coupling agent KH-500: 12 parts, silicone oil: 3 parts, and polyethylene glycol: 3 parts;

[0045] Step S2, dispersion of the modified oil-gas separation inner layer slurry: the modified oil-gas separation inner layer slurry is sent into a disperser for beating and dispersion, and the concentration of the modified oil-gas separation inner layer slurry is controlled at 6 wt%, to obtain the dispersed inner layer slurry;

[0046] Step S3, preparation of modified oil-gas separation outer layer slurry:

[0047] Step S31: take 50 parts by weight of sulfuric acid salt wood pulp, 10 parts by weight of sulfite wood pulp, and 3 parts by weight of glass fiber with a diameter of 23 μm, mix uniformly to obtain oil-gas separation outer layer slurry;

[0048] Step S32: taking the oil-gas separation outer layer slurry, putting it into a second modification liquid, impregnating for 90 min, taking it out, drying, and obtaining the modified oil-gas separation outer layer slurry; the second modification liquid comprises, by weight: water: 100 parts, polytetrafluoroethylene emulsion: 6 parts;

[0049] Step S4, dispersion of the modified oil-gas separation outer layer slurry: putting the modified oil-gas separation outer layer slurry into a pulping device, controlling the concentration of the modified oil-gas separation outer layer slurry at 10 wt%, and pulping and dispersing at a speed of 600 rpm for 20 min; and then pulping at a speed of 1200 rpm for 30 min, to obtain a dispersed outer layer slurry;

[0050] Step S5, flash pulping and webbing, and dewatering and forming:

[0051] Step S51: uniformly overflowing the dispersed inner layer slurry to the wearing surface of the forming wire, and obtaining a first wet paper web through first vacuum suction;

[0052] Step S52: applying waterproof and oil-repellent sizing material to the first wet paper web, and obtaining a sized first wet paper web through second vacuum suction; specifically, taking 100 parts by weight of acrylic resin, 6 parts by weight of fluorine-containing waterproof and oil-repellent agent, 0.5 parts by weight of sulfonate anionic surfactant, and 0.4 parts by weight of melamine, stirring uniformly, and obtaining the waterproof and oil-repellent sizing material;

[0053] Step S53: uniformly overflowing the dispersed outer layer slurry on the surface of the sized first wet paper web, and obtaining a wet paper sheet through third vacuum suction until the moisture content is 40%;

[0054] Step S6, performing a reinforcing modification treatment: freezing the wet paper sheet at -20°C for 20 h, taking it out, and standing to room temperature, and then performing drying and curing on the wet paper sheet, to obtain the high-efficiency oil-gas separation filter material.

[0055] Example 2

[0056] A method for preparing a high-efficiency oil-gas separation filter material, comprising the following steps:

[0057] Step S1, preparation of a modified oil-gas separation inner layer slurry:

[0058] Step S11: taking 55 parts by weight of glass fibers with a diameter of 5 μm, 45 parts by weight of glass fibers with a diameter of 10 μm, and 15 parts by weight of glass fibers with a diameter of 25 μm, mixing uniformly, and obtaining oil-gas separation inner layer mixed fibers;

[0059] Step S12: take the oil-gas separation inner layer mixed fiber, immerse it in the first modification liquid for 8h, take it out, dry, and obtain the modified oil-gas separation inner layer slurry; the first modification liquid comprises, by weight fraction: water: 100 parts, perfluoropolyether: 6 parts, silane coupling agent KH-500: 15 parts, silicone oil: 5 parts, and polyethylene glycol: 5 parts;

[0060] Step S2, dispersion of the modified oil-gas separation inner layer slurry: the modified oil-gas separation inner layer slurry is sent into a disperser for beating and dispersion, the concentration of the modified oil-gas separation inner layer slurry is controlled at 8wt%, and a dispersed inner layer slurry is obtained;

[0061] Step S3, preparation of the modified oil-gas separation outer layer slurry:

[0062] Step S31: take 55 parts by weight of sulfate wood pulp, 15 parts by weight of sulfite wood pulp, and 5 parts by weight of glass fiber with a diameter of 25μm, mix uniformly, and obtain an oil-gas separation outer layer slurry;

[0063] Step S32: take the oil-gas separation outer layer slurry, immerse it in the second modification liquid for 110min, take it out, dry, and obtain the modified oil-gas separation outer layer slurry; the second modification liquid comprises, by weight fraction: water: 100 parts, and polytetrafluoroethylene emulsion: 8 parts;

[0064] Step S4, dispersion of the modified oil-gas separation outer layer slurry: the modified oil-gas separation outer layer slurry is put into a pulping device, the concentration of the modified oil-gas separation outer layer slurry is controlled at 13wt%, and beating and dispersion are performed at a speed of 800rpm for 25min; then beating and dispersion are performed at a speed of 1500rpm for 35min, and a dispersed outer layer slurry is obtained;

[0065] Step S5, jetting and webbing, and dewatering and forming:

[0066] Step S51: uniformly overflow the dispersed inner layer slurry to the wearing surface of a forming net, perform first vacuum suction, and obtain a first wet paper web;

[0067] Step S52: apply waterproof and oil-proof sizing material to the first wet paper web, perform second vacuum suction, and obtain a sized first wet paper web; specifically, take 100 parts by weight of acrylic resin, 8 parts by weight of fluorine-containing waterproof and oil-proof agent, 0.8 parts by weight of sulfonate anionic surfactant, and 0.6 parts by weight of melamine, stir uniformly, and obtain the waterproof and oil-proof sizing material;

[0068] Step S53: uniformly overflow the dispersed outer layer slurry on the surface of the sized first wet paper web, perform third vacuum suction to a moisture content of 45%, and obtain a wet paper sheet;

[0069] Step S6, performing an enhanced modification treatment: freezing the wet paper sheet at -25℃ for 24h, taking it out, standing to room temperature, and then drying and curing the wet paper sheet, to obtain the high-efficiency oil-gas separation filter material.

[0070] Example 3

[0071] A preparation method of a high-efficiency oil-gas separation filter material, comprising the following steps:

[0072] Step S1, preparation of a modified oil-gas separation inner layer slurry:

[0073] Step S11: taking 52 parts by weight of glass fibers with a diameter of 5μm, 42 parts by weight of glass fibers with a diameter of 10μm, and 13 parts by weight of glass fibers with a diameter of 25μm, and mixing uniformly to obtain oil-gas separation inner layer mixed fibers;

[0074] Step S12: taking the oil-gas separation inner layer mixed fibers, immersing them in a first modification liquid for 6h, taking them out, and drying to obtain the modified oil-gas separation inner layer slurry; the first modification liquid comprises, by weight: water: 100 parts, perfluoropolyether: 5 parts, silane coupling agent KH-500: 14 parts, silicone oil: 4 parts, and polyethylene glycol: 4 parts;

[0075] Step S2, dispersion of the modified oil-gas separation inner layer slurry: feeding the modified oil-gas separation inner layer slurry into a disperser for beating and dispersion, and controlling the concentration of the modified oil-gas separation inner layer slurry at 7wt% to obtain a dispersed inner layer slurry;

[0076] Step S3, preparation of a modified oil-gas separation outer layer slurry:

[0077] Step S31: taking 52 parts by weight of kraft wood pulp, 13 parts by weight of sulfite wood pulp, and 4 parts by weight of glass fibers with a diameter of 25μm, and mixing uniformly to obtain an oil-gas separation outer layer slurry;

[0078] Step S32: taking the oil-gas separation outer layer slurry, immersing it in a second modification liquid for 100min, taking it out, and drying to obtain the modified oil-gas separation outer layer slurry; the second modification liquid comprises, by weight: water: 100 parts, and polytetrafluoroethylene emulsion: 7 parts;

[0079] Step S4, dispersion of the modified oil-gas separation outer layer slurry: feeding the modified oil-gas separation outer layer slurry into a pulping device, controlling the concentration of the modified oil-gas separation outer layer slurry at 11wt%, and pulping and dispersing at a speed of 700rpm for 22min; and then pulping at a speed of 1300rpm for 32min to obtain a dispersed outer layer slurry;

[0080] Step S5, slurry punching and webbing, and dehydration and forming:

[0081] Step S51: evenly overflow the dispersed inner layer slurry to the wearing surface of the forming wire, and obtain a first wet paper web through first vacuum suction;

[0082] Step S52: apply waterproof and oil-proof sizing agent to the first wet paper web, and obtain a sized first wet paper web through second vacuum suction; specifically, 100 parts by weight of acrylic resin, 7 parts by weight of fluorine-containing waterproof and oil-proof agent, 0.6 parts by weight of sulfonate anionic surfactant, and 0.5 parts by weight of melamine are uniformly stirred to obtain the waterproof and oil-proof sizing agent;

[0083] Step S53: evenly overflow the dispersed outer layer slurry on the surface of the sized first wet paper web, and obtain a wet paper sheet through third vacuum suction until the water content is 42%;

[0084] Step S6: perform enhancement modification treatment: freeze the wet paper sheet at -22℃ for 22h, take it out, and stand until room temperature, and then perform drying and curing on the wet paper sheet to obtain the high-efficiency oil-gas separation filter material.

[0085] Comparative Example 1

[0086] A preparation method of a high-efficiency oil-gas separation filter material, comprising the following steps:

[0087] Step S1: preparation of modified oil-gas separation inner layer slurry:

[0088] Step S11: put glass fibers with a diameter of 5μm into a first modification liquid for 6h of immersion, take out and dry to obtain the modified oil-gas separation inner layer slurry; the first modification liquid comprises, by weight: water: 100 parts, perfluoropolyether: 5 parts, silane coupling agent KH-500: 14 parts, silicone oil: 4 parts, and polyethylene glycol: 4 parts;

[0089] Step S2: dispersion of modified oil-gas separation inner layer slurry: put the modified oil-gas separation inner layer slurry into a disperser for beating and dispersion, and control the concentration of the modified oil-gas separation inner layer slurry at 7wt% to obtain dispersed inner layer slurry;

[0090] Step S3: preparation of modified oil-gas separation outer layer slurry:

[0091] Step S31: uniformly mix 52 parts by weight of sulfate wood pulp and 4 parts by weight of glass fibers with a diameter of 25μm to obtain oil-gas separation outer layer slurry;

[0092] Step S32: put the oil-gas separation outer layer slurry into a second modification liquid for 100min of immersion, take out and dry to obtain the modified oil-gas separation outer layer slurry; the second modification liquid comprises, by weight: water: 100 parts, and polytetrafluoroethylene emulsion: 7 parts;

[0093] Step S4, dispersion of the modified oil-gas separation outer layer slurry: the modified oil-gas separation outer layer slurry is put into a pulping device, the concentration of the modified oil-gas separation outer layer slurry is controlled at 11wt%, and pulping dispersion is performed at a speed of 700rpm for 22min; pulping dispersion is performed at a speed of 1300rpm for 32min to obtain the dispersed outer layer slurry;

[0094] Step S5, web formation by pulp rushing:

[0095] Step S51: the dispersed inner layer slurry is uniformly overflowed onto the wearing surface of the forming wire, and a first wet paper web is obtained through first vacuum suction;

[0096] Step S52: waterproof and oil-repellent sizing is performed on the first wet paper web, and a sized first wet paper web is obtained through second vacuum suction; specifically, 100 parts by weight of an acrylic resin, 7 parts by weight of a fluorine-containing waterproof and oil-repellent agent, 0.6 parts by weight of a sulfonate anionic surfactant, and 0.5 parts by weight of melamine are uniformly stirred to obtain the waterproof and oil-repellent sizing;

[0097] Step S53: the dispersed outer layer slurry is uniformly overflowed on the surface of the sized first wet paper web, and a wet paper sheet is obtained through third vacuum suction to a water content of 42%;

[0098] Step S6, enhancement modification treatment: the wet paper sheet is frozen at -22℃ for 22h, taken out, and left to room temperature, and then the wet paper sheet is dried and cured to obtain the high-efficiency oil-gas separation filter material.

[0099] Comparative Example 2

[0100] A method for preparing a high-efficiency oil-gas separation filter material, comprising the following steps:

[0101] Step S1, preparation of a modified oil-gas separation inner layer slurry:

[0102] Step S11: 52 parts by weight of glass fibers with a diameter of 5μm, 42 parts by weight of glass fibers with a diameter of 10μm, and 13 parts by weight of glass fibers with a diameter of 25μm are uniformly mixed to obtain oil-gas separation inner layer mixed fibers;

[0103] Step S12: the oil-gas separation inner layer mixed fibers are put into a first modification liquid for impregnation for 6h, taken out, and dried to obtain the modified oil-gas separation inner layer slurry; the first modification liquid comprises, by weight: water: 100 parts, perfluoropolyether: 5 parts, silane coupling agent KH-500: 14 parts, silicone oil: 4 parts, and polyethylene glycol: 4 parts;

[0104] Step S2, dispersion of the modified oil-gas separation inner layer slurry: the modified oil-gas separation inner layer slurry is sent into a disperser for dispersion, the concentration of the modified oil-gas separation inner layer slurry is controlled at 7wt%, and a dispersed inner layer slurry is obtained;

[0105] Step S3, preparation of the modified oil-gas separation outer layer slurry:

[0106] Step S31: 52 parts by weight of kraft wood pulp, 13 parts by weight of sulfite wood pulp, and 4 parts by weight of glass fibers with a diameter of 25 μm are uniformly mixed to obtain an oil-gas separation outer layer slurry;

[0107] Step S32: the oil-gas separation outer layer slurry is taken and placed into a second modification liquid for impregnation for 100 min, taken out, and dried to obtain the modified oil-gas separation outer layer slurry; the second modification liquid comprises, by weight: water: 100 parts, and polytetrafluoroethylene emulsion: 7 parts;

[0108] Step S4, dispersion of the modified oil-gas separation outer layer slurry: the modified oil-gas separation outer layer slurry is put into a pulping device, the concentration of the modified oil-gas separation outer layer slurry is controlled at 11wt%, and pulping dispersion is performed at a speed of 700 rpm for 22 min and at a speed of 1300 rpm for 32 min, to obtain a dispersed outer layer slurry;

[0109] Step S5, slurry rushing and webbing, and dewatering and forming:

[0110] Step S51: the dispersed inner layer slurry is uniformly overflowed onto the wearing surface of a forming wire, and a first wet paper web is obtained through first vacuum suction;

[0111] Step S52: waterproof and oil-repellent sizing is performed on the first wet paper web, and a sized first wet paper web is obtained through second vacuum suction; specifically, 100 parts by weight of an acrylic resin, 7 parts by weight of a fluorine-containing waterproof and oil-repellent agent, 0.6 parts by weight of a sulfonate anionic surfactant, and 0.5 parts by weight of melamine are uniformly stirred to obtain the waterproof and oil-repellent sizing;

[0112] Step S53: the dispersed outer layer slurry is uniformly overflowed on the surface of the sized first wet paper web, and the wet paper web is subjected to drying and curing through third vacuum suction, to obtain the high-efficiency oil-gas separation filter material.

[0113] Comparative Example 3

[0114] A method for preparing a high-efficiency oil-gas separation filter material, comprising the following steps:

[0115] Step S1, preparation of the modified oil-gas separation inner layer slurry:

[0116] Step S11: Take 52 parts by weight of glass fibers with a diameter of 5 μm, 42 parts by weight of glass fibers with a diameter of 10 μm, and 13 parts by weight of glass fibers with a diameter of 25 μm, mix uniformly, and obtain the oil-gas separation inner layer mixed fibers;

[0117] Step S12: Take the oil-gas separation inner layer mixed fibers, immerse them in the first modification liquid for 6 h, take them out, and dry them to obtain the modified oil-gas separation inner layer slurry; the first modification liquid comprises, by weight: water: 100 parts, perfluoropolyether: 5 parts, silane coupling agent KH-500: 14 parts, silicone oil: 4 parts, and polyethylene glycol: 4 parts;

[0118] Step S2, dispersion of the modified oil-gas separation inner layer slurry: the modified oil-gas separation inner layer slurry is sent to a disperser for beating and dispersion, the concentration of the modified oil-gas separation inner layer slurry is controlled at 7 wt%, and a dispersed inner layer slurry is obtained;

[0119] Step S3, preparation of the modified oil-gas separation outer layer slurry:

[0120] Step S31: Take 52 parts by weight of kraft wood pulp, 13 parts by weight of sulfite wood pulp, and 4 parts by weight of glass fibers with a diameter of 25 μm, mix uniformly, and obtain the oil-gas separation outer layer slurry;

[0121] Step S32: Take the oil-gas separation outer layer slurry, immerse it in the second modification liquid for 100 min, take it out, and dry it to obtain the modified oil-gas separation outer layer slurry; the second modification liquid comprises, by weight: water: 100 parts, and polytetrafluoroethylene emulsion: 7 parts;

[0122] Step S4, dispersion of the modified oil-gas separation outer layer slurry: the modified oil-gas separation outer layer slurry is put into a pulping device, the concentration of the modified oil-gas separation outer layer slurry is controlled at 11 wt%, and beating and dispersion are performed at a speed of 700 rpm for 22 min; an alkali adjusting solution is added to adjust the pH to 9.2, and beating and dispersion are further performed at a speed of 1300 rpm for 32 min, and a dispersed outer layer slurry is obtained;

[0123] Step S5, slurry rushing and webbing, and dewatering and forming:

[0124] Step S51: The dispersed inner layer slurry is uniformly overflowed onto the wearing surface of the forming wire, and a first wet paper web is obtained through first vacuum suction;

[0125] Step S52: The first wet paper web is applied with a waterproof and oil-repellent sizing agent, and a sized first wet paper web is obtained through second vacuum suction; specifically, 100 parts by weight of an acrylic resin, 7 parts by weight of a fluorine-containing waterproof and oil-repellent agent, 0.6 parts by weight of a sulfonate anionic surfactant, and 0.5 parts by weight of melamine are uniformly stirred to obtain the waterproof and oil-repellent sizing agent;

[0126] Step S53: evenly overflow the dispersed outer layer slurry on the surface of the sized first wet paper web, pass through a third vacuum suction, and then dry and solidify the wet paper web to obtain the high-efficiency oil-gas separation filter material.

[0127] I. Test the performance of the high-efficiency oil-gas separation filter material prepared in the above Examples 1-3 and Comparative Examples 1-3: the test results are shown in the following table.

[0128]

[0129]

[0130] From the above test results, it can be seen that the preparation method of the high-efficiency oil-gas separation filter material optimizes the composition ratio of the oil-gas separation inner and outer layer slurry, the slurry dispersion process, and the drying and solidification process, solves the problem that the oil-gas separation outer layer slurry is easy to cause hole blocking and leads to the decline of the oil-gas separation inner layer filtration performance, has higher filtration efficiency for 0.3-micron particles, and has smaller filtration resistance at a flow rate of 5-20 cm / s, thereby improving the overall filtration performance of the oil-gas separation filter material; and after optimization, the oil-gas separation outer layer has a water resistance grade of 12, good environmental durability, and can meet the use requirements in more harsh environments.

[0131] Although the present application has been described in detail in the foregoing description, it will be understood by those skilled in the art that various modifications and improvements can be made to the present application without departing from the spirit of the present application. Therefore, these modifications and improvements made on the basis of the present application without departing from the spirit of the present application shall all fall within the scope of the present application.

Claims

1. A method of making a high efficiency oil and gas separation filter material, characterized by, The method comprises the following steps: Step S1, preparation of modified oil-gas separation inner layer slurry: Step S11: 50-55 parts by weight of glass fibers with a diameter of 3-5 μm, 40-45 parts by weight of glass fibers with a diameter of 8-10 μm, and 10-15 parts by weight of glass fibers with a diameter of 23-25 μm are mixed uniformly to obtain oil-gas separation inner layer mixed fibers; Step S12: the oil-gas separation inner layer mixed fibers are taken and immersed in a first modification liquid for 5-8 hours, taken out and dried to obtain the modified oil-gas separation inner layer slurry; the first modification liquid comprises, by weight: water 100 parts, perfluoropolyether 4-6 parts, silane coupling agent KH-500 12-15 parts, silicone oil 3-5 parts, and polyethylene glycol 3-5 parts; Step S2, dispersion of the modified oil-gas separation inner layer slurry: the modified oil-gas separation inner layer slurry is sent to a disperser for beating and dispersion, the concentration of the modified oil-gas separation inner layer slurry is controlled at 6-8 wt%, and a dispersed inner layer slurry is obtained; Step S3, preparation of modified oil-gas separation outer layer slurry: Step S31: 50-55 parts by weight of sulfite wood pulp, 10-15 parts by weight of sulfite wood pulp, and 3-5 parts by weight of glass fibers with a diameter of 23-25 μm are mixed uniformly to obtain oil-gas separation outer layer slurry; Step S32: the oil-gas separation outer layer slurry is taken and immersed in a second modification liquid for 90-110 minutes, taken out and dried to obtain the modified oil-gas separation outer layer slurry; the second modification liquid comprises, by weight: water 100 parts and polytetrafluoroethylene emulsion 6-8 parts; Step S4, dispersion of the modified oil-gas separation outer layer slurry: the modified oil-gas separation outer layer slurry is put into a pulping device, the concentration of the modified oil-gas separation outer layer slurry is controlled at 10-13 wt%, and beating and dispersion are performed at a speed of 600-800 rpm for 20-25 minutes; then beating is performed at a speed of 1200-1500 rpm for 30-35 minutes, and a dispersed outer layer slurry is obtained; Step S5, slurry rushing and webbing, and dewatering and forming: Step S51: the dispersed inner layer slurry is uniformly overflowed onto the wearing surface of a forming net, and a first wet paper web is obtained through first vacuum suction; Step S52: waterproof and oil-proof sizing material is applied to the first wet paper web, and a sized first wet paper web is obtained through second vacuum suction; Step S53: the dispersed outer layer slurry is uniformly overflowed on the surface of the sized first wet paper web, and the moisture content is controlled to 40-45% through third vacuum suction, and a wet paper sheet is obtained; Step S6, enhancement and modification treatment: the wet paper sheet is frozen at-20 to-25 ℃ for 20-24 hours, taken out and placed at room temperature, and then the wet paper sheet is dried and cured, and the high-efficiency oil-gas separation filter material is obtained; In step S52, 100 parts by weight of acrylic resin, 6-8 parts by weight of fluorine-containing waterproof and oil-proof agent, 0.5-0.8 parts by weight of sulfonate anionic surfactant, and 0.4-0.6 parts by weight of melamine are stirred uniformly to obtain the waterproof and oil-proof sizing material.

2. The method for preparing a high-efficiency oil-gas separation and filtration material according to claim 1, characterized in that, In the step S11, 52-55 parts by weight of glass fibers with a diameter of 3-5 μm, 42-45 parts by weight of glass fibers with a diameter of 8-10 μm, and 13-15 parts by weight of glass fibers with a diameter of 23-25 μm are mixed to obtain the inner layer mixed fibers for oil and gas separation.

3. The method for preparing a high-efficiency oil-gas separation and filtration material according to claim 1, characterized in that, In the step S12, the inner layer mixed fibers for oil and gas separation are immersed in the first modification liquid for 6-8 h, taken out, and dried to obtain the modified inner layer slurry for oil and gas separation; the first modification liquid comprises, by weight fraction: water 100 parts, perfluoropolyether 5-6 parts, silane coupling agent KH-500 14-15 parts, silicone oil 4-5 parts, and polyethylene glycol 4-5 parts.

4. The method for preparing a high-efficiency oil-gas separation and filtration material according to claim 1, characterized in that, In the step S2, the modified inner layer slurry for oil and gas separation is sent to a disperser for beating and dispersing, and the concentration of the modified inner layer slurry for oil and gas separation is controlled at 7-8 wt% to obtain the dispersed inner layer slurry.

5. The method for preparing a high-efficiency oil-gas separation and filtration material according to claim 1, characterized in that, In the step S31, 52-55 parts by weight of kraft pulp, 13-15 parts by weight of sulfite pulp, and 4-5 parts by weight of glass fibers with a diameter of 23-25 μm are mixed to obtain the outer layer slurry for oil and gas separation.

6. The method for preparing a high-efficiency oil-gas separation and filtration material according to claim 1, characterized in that, In the step S32, the outer layer slurry for oil and gas separation is immersed in the second modification liquid for 100-110 min, taken out, and dried to obtain the modified outer layer slurry for oil and gas separation; the second modification liquid comprises, by weight fraction: water 100 parts and polytetrafluoroethylene emulsion 6-8 parts.

7. The method for preparing a high-efficiency oil-gas separation and filtration material according to claim 1, characterized in that, In the step S4, the modified outer layer slurry for oil and gas separation is put into a pulping device, the concentration of the modified outer layer slurry for oil and gas separation is controlled at 11-13 wt%, and the pulping and dispersing are performed at a speed of 700-800 rpm for 22-25 min, and then at a speed of 1300-1500 rpm for 32-35 min to obtain the dispersed outer layer slurry.

8. The method for preparing a high-efficiency oil-gas separation and filtration material according to claim 1, characterized in that, In the step S53, the dispersed outer layer slurry is uniformly overflowed on the surface of the sized first wet paper web, and the moisture content is controlled to 43-45% by third vacuum suction to obtain a wet paper sheet.

9. The method for preparing a high-efficiency oil-gas separation and filtration material according to claim 1, characterized in that, In the step S6, the wet paper sheet is frozen at -22 to -25 °C for 22-24 h, taken out, and left to room temperature, and then the wet paper sheet is dried and solidified to obtain the high-efficiency oil and gas separation filter material.

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