An oil separation filter paper and its production process

Abstract

The present invention relates to the field of air filtration materials, in particular to an oil separation filter paper and its production process. Among them, the production process of the oil separation filter paper includes: raw material preparation, adding water and inorganic acid to a mixture of alkali-free glass microfiber cotton and alkali-free glass fiber short cut filaments and stirring evenly to make a pulp suspension; crushing and pulping, adding the prepared raw materials into a crusher for beating and dispersing, and filtering the pulp with a filtering device to obtain the pulp; wet forming, transferring the obtained pulp to a storage tank and diluting it to a mass concentration of 0.1-0.3%, and adjusting the pH value to 2.0-3.5, and transporting the pulp in the storage tank to a former for forming to obtain a wet paper; suction dehydration, dehydrating the obtained wet paper to make the moisture content of the wet paper less than 15%; sizing treatment, passing the treated wet paper through an impregnation tank and a spraying section respectively; drying treatment, drying the treated wet paper to obtain a primary glass fiber filter paper; finished product shaping, placing the obtained primary glass fiber filter paper into a mold for stamping and shaping.

Description

Technical Field

[0001] The present invention relates to the field of air filtration materials, and particularly to an oil separation filter paper and its production process. Background Art

[0002] The air compressed by the compressor will carry oil droplets. The large oil droplets will be separated when passing through the oil-gas separation tank body, while the small oil droplets need to be filtered and separated through the set oil-gas separation filter element. The small oil droplets intercepted by the filter element will settle to the bottom of the filter element under the action of pneumatic force and gravity, and then return to the lubrication system through the pipeline at the bottom of the filter element, and are discharged from the compressor, so that the compressor has pure and high-quality compressed air.

[0003] Glass fiber filter material is an air filtration material developed earlier. The glass fiber filter paper obtained the US patent for air filtration in October 1940 for the first time and once occupied the dominant position of high-efficiency filter paper. The electret air filter material has the advantages of low flow resistance, high efficiency, long life, high dust collection ability and energy saving, which makes the research and development of air filters using this as the filter material develop very rapidly. It started in the 1970s and achieved industrialization by the 1990s with the development and utilization of various charging technologies and mixed fiber charging technologies. In recent years, with the development of polymer chemical fibers, the high-efficiency filters and ultra-high-efficiency filters produced by electret fibers have shown a rapid growth trend, seriously affecting the dominant position of glass fiber filter materials. However, in a high-humidity environment, the surface potential of the electret air filter material changes greatly, resulting in a great impact on the filtration performance of the filter material. According to the analysis of the filtration mechanism of the electret air filter material, the electret air filter material cannot be used for a long time in a high-humidity environment. Therefore, in the field of high humidity resistance, the advantages of glass fiber filter materials are very obvious. However, at present, the fiber thickness and diameter ratio of the domestic oil-gas separation filter paper is unreasonable, and the pore size distribution is unreasonable, and it cannot well aggregate and separate oil and water. Therefore, there is an urgent need for a water-absorbing and oil-resistant filter paper to improve the efficiency of oil-gas separation and aggregation. Summary of the Invention

[0004] Aiming at the deficiencies of the existing technology, the purpose of the present invention is to provide an oil separation filter paper and its production process to solve the problems in the background art.

[0005] The technical solution of the present invention is realized as follows: A production process of an oil separation filter paper, preferably, includes the following steps:

[0006] Step 1: Raw material preparation, adding water and inorganic acid to the mixture of alkali-free glass microfiber cotton and alkali-free glass fiber short cut filaments and stirring evenly to make a pulp suspension;

[0007] Step 2: Crushing and pulping, adding the raw materials prepared in Step 1 into a crusher for beating and dispersing, and filtering the pulp with a filtering device to obtain the pulp;

[0008] Step 3: Wet forming. Transfer the slurry obtained in Step 2 to a storage tank and dilute it to a mass concentration of 0.1 - 0.3%, and adjust the pH value to 2.0 - 3.5. Then, convey the slurry in the storage tank to a former for forming to obtain wet paper.

[0009] Step 4: Suction dewatering. Dewater the wet paper obtained in Step 3 to make the moisture content of the wet paper less than 15%.

[0010] Step 5: Sizing treatment. Pass the wet paper treated in Step 4 through an immersion sizing tank and a spray sizing section respectively.

[0011] Step 6: Drying treatment. Dry the wet paper treated in Step 5 to obtain a primary glass fiber filter paper.

[0012] Step 7: Finished product shaping. Place the primary glass fiber filter paper obtained in Step 6 into a mold for stamping and forming.

[0013] Preferably, in Step 1, the inorganic acid is boric acid.

[0014] Preferably, in Step 6, the drying treatment adopts the direct combustion method, and dries at 200 - 240 °C for 4 - 10 min by controlling the flame.

[0015] Preferably, in Step 2, the filtering device includes:

[0016] A tank body, having a feed pipe communicating with its inner cavity at the top;

[0017] A first filter screen, arranged in a ring shape in the tank body, and the top edge thereof is hermetically connected to the inner wall of the tank body;

[0018] A second filter screen, arranged in a ring shape inside the first filter screen, and the bottom thereof is hermetically connected to the bottom of the first filter screen through a sealing plate. Wherein, a filter cavity is formed between the first filter screen and the second filter screen;

[0019] A first discharge pipe, passing through the side wall of the tank body and communicating with the filter cavity;

[0020] A second discharge pipe, arranged on the tank body and communicating with the inner cavity of the tank body;

[0021] A stirring and screening mechanism, including a stirring and screening member arranged in the filter cavity and a driving member for driving the stirring and screening member to rotate;

[0022] Wherein, automatic valves are arranged on both the first discharge pipe and the second discharge pipe.

[0023] Preferably, the stirring and screening member includes:

[0024] A rotating shaft, rotatably arranged in the tank body and coaxially arranged with the tank body;

[0025] A first connecting ring, sleeved outside the rotating shaft and fixedly connected to the rotating shaft;

[0026] A second connecting ring, arranged in the filter cavity;

[0027] The stirring column includes a plurality of column bodies one fixedly arranged on the outer side walls of the first connecting ring and the second connecting ring and column bodies two arranged on the inner side walls of the first connecting ring and the second connecting ring, and the column bodies one and the column bodies two are alternately distributed.

[0028] Preferably, the driving member is a servo motor.

[0029] Preferably, in step 7, the mold includes:

[0030] A main body, which has a plurality of forming grooves thereon;

[0031] A jacking mechanism, arranged in the forming groove for jacking up the primary glass fiber filter paper formed in the forming groove.

[0032] Preferably, the jacking mechanism includes:

[0033] An activity groove, arranged at the bottom of the forming groove;

[0034] A top block, movably embedded in the activity groove and fitting the contour of the activity groove;

[0035] An electric control cylinder, whose output arm is connected to the top block for driving the top block to move;

[0036] An air jet unit, which includes a spray head arranged in the activity groove and an air supply device for supplying air to the spray head.

[0037] Preferably, the air supply device is a compressor.

[0038] An oil separation filter paper is made by using the production process of the oil separation filter paper.

[0039] Beneficial effects:

[0040] First, through the mixing of alkali-free glass microfiber cotton and alkali-free glass fiber short cut filaments, on the one hand, the strength of the finally prepared filter paper is ensured, its service life is improved, and on the other hand, the fibers can be evenly dispersed, thereby ensuring that the pore size distribution in the finally prepared filter paper is uniform, which is beneficial to improving the filtration speed of the filter paper and accelerating its working efficiency;

[0041] Second, the preparation process of the oil separation filter paper is simple and suitable for industrial production;

[0042] Third, the set filtering equipment can perform hierarchical filtration on the pulp, filter the pulp into different hierarchical finenesses, so as to facilitate the production of filter papers with different filtration grades. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0044] Figure 1 Is a perspective view of the filtering device in a specific embodiment of the present invention;

[0045] Figure 2 Is Figure 1 The top view of;

[0046] Figure 3 Is Figure 2 The cross-sectional view of part A-A in;

[0047] Figure 4 Is a schematic diagram of the stirring mechanism in a specific embodiment of the present invention;

[0048] Figure 5 Is the cross-sectional view of the mold in a specific embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0049] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0050] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0051] In the description of the present invention, "several" means one or more, "multiple" means more than two, and understandings such as "greater than", "less than", and "exceeding" do not include the present number, while understandings such as "above", "below", and "within" include the present number. If there is a description of "first" and "second", it is only for the purpose of distinguishing technical features and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0052] In the description of the present invention, unless otherwise clearly defined, words such as "set", "install", and "connect" should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution.

[0053] For the specific embodiments of the present invention, reference may be specifically made to the figures shown in the specification.

[0054] The present invention discloses a production process of oil separation filter paper. In a specific embodiment of the present invention, it includes the following steps:

[0055] Step 1: Raw material preparation. Add water and inorganic acid to the mixture of alkali-free glass microfiber cotton and alkali-free glass fiber short cut filaments and stir evenly to make a pulp suspension;

[0056] Step 2: Pulverization and pulping. Add the raw materials prepared in Step 1 into a pulverizer for beating and dispersion, and filter the pulp with a filtering device to obtain pulp;

[0057] Step 3: Wet forming. Transfer the pulp obtained in Step 2 to a storage tank and dilute it to a mass concentration of 0.1-0.3%, and adjust the pH value to 2.0-3.5. Then, transport the pulp in the storage tank to a former for forming to obtain wet paper;

[0058] Step 4: Suction dehydration. Dehydrate the wet paper obtained in Step 3 to make the moisture content of the wet paper less than 15%;

[0059] Step 5: Sizing treatment. Pass the wet paper treated in Step 4 through an impregnating bath and a spraying section respectively;

[0060] Step 6: Drying treatment. Dry the wet paper treated in Step 5 to obtain primary glass fiber filter paper;

[0061] Step 7: Finished product shaping. Place the primary glass fiber filter paper obtained in Step 6 into a mold for stamping and forming.

[0062] In a specific embodiment of the present invention, in Step 1, the inorganic acid is boric acid.

[0063] In a specific embodiment of the present invention, in Step 6, the drying treatment adopts the direct combustion method, and dries at 200-240°C for 4-10 min by controlling the flame.

[0064] By adopting the above technical solution, the mixing of alkali-free glass microfiber cotton and alkali-free glass fiber short cut filaments can, on the one hand, ensure the strength of the finally prepared filter paper and improve its service life, and on the other hand, enable the fibers to be evenly dispersed, thereby ensuring uniform pore size distribution in the finally prepared filter paper, which is beneficial to improving the filtration speed of the filter paper and accelerating its working efficiency. The preparation process of this oil filter paper is simple and suitable for industrial production;

[0065] In a specific embodiment of the present invention, in step 2, the filtering device 1 includes:

[0066] A tank body 11, the top of which is provided with a feed pipe 12 communicating with its inner cavity;

[0067] A first filter screen 13, arranged in a ring shape in the tank body 11, and the top edge of which is hermetically connected to the inner wall of the tank body 11;

[0068] A second filter screen 14, arranged in a ring shape inside the first filter screen 13, and the bottom of which is hermetically connected to the bottom of the first filter screen 13 through a sealing plate. Among them, a filter cavity 100 is formed between the first filter screen 13 and the second filter screen 14;

[0069] A first discharge pipe 15, passing through the side wall of the tank body 11 and communicating with the filter cavity 100;

[0070] A second discharge pipe 16, arranged on the tank body 11 and communicating with the inner cavity of the tank body 11;

[0071] A stirring and screening mechanism 17, including a stirring and screening member 171 arranged in the filter cavity 100 and a driving member 172 for driving the stirring and screening member 171 to rotate;

[0072] Among them, automatic valves 200 are provided on both the first discharge pipe 15 and the second discharge pipe 16.

[0073] By adopting the above technical solution, the provided filtering device can perform grading filtration on the pulp, filter the pulp into different grading fineness, so as to facilitate the production of filter papers with different filtration grades. The pulp is introduced into the filter cavity through the feed pipe, and the driving member of the stirring and screening mechanism drives the stirring and screening member to rotate, so that the pulp in the filter cavity generates centrifugal force. The pulp smaller than the mesh holes of the first filter screen and the second filter screen penetrates through and is discharged through the second discharge pipe, and the pulp in the filter cavity is discharged through the first pipe, thereby completing the grading screening with high screening efficiency.

[0074] In a specific embodiment of the present invention, the stirring and screening member 171 includes:

[0075] A rotating shaft 1711, rotatably arranged in the tank body 11 and coaxially arranged with the tank body 11;

[0076] The first connecting ring 1712 is sleeved outside the rotating shaft 1711 and fixedly connected to the rotating shaft 1711;

[0077] The second connecting ring 1713 is arranged in the filter chamber 100;

[0078] The stirring column 1714 includes a plurality of column bodies 17141 fixedly arranged on the outer side walls of the first connecting ring 1712 and the second connecting ring 1713, and column bodies 17142 arranged on the inner side walls of the first connecting ring 1712 and the second connecting ring 1713, and the column bodies 17141 and the column bodies 17142 are alternately distributed.

[0079] By adopting the above technical solution, when the rotating shaft is driven to generate a rotating action, the first connecting ring is driven to rotate, and then the second connecting ring and the stirring column rotate, forming a stirring action on the filter chamber. Further, since the column bodies 17141 and the column bodies 17142 are alternately distributed, the stirring efficiency can be greatly improved. At the same time, when the column bodies 17141 and the column bodies 17142 rotate around the rotating shaft, the pulp in the filter chamber will be squeezed towards the first filter screen and the second filter screen, improving the filtering speed. At the same time, the pulp will be guided when passing through the interval between the column bodies 17141 and the column bodies 17142, thus generating an interlaced impact action and being dispersed.

[0080] In a specific embodiment of the present invention, the driving member 1711 is a servo motor.

[0081] In a specific embodiment of the present invention, in step 7, the mold 2 includes:

[0082] The body 21, which has a plurality of molding grooves 211 thereon;

[0083] The jacking mechanism 22 is arranged in the molding groove 211 for jacking up the primary glass fiber filter paper formed in the molding groove 211.

[0084] In a specific embodiment of the present invention, the jacking mechanism 22 includes:

[0085] The movable groove 221 is arranged at the bottom of the molding groove 211;

[0086] The top block 222 is movably embedded in the movable groove 221 and fits the contour of the movable groove 221;

[0087] The electric control cylinder 223, whose output arm is connected to the top block 222 for driving the top block 222 to move;

[0088] The air jet unit 224 includes a nozzle 2241 arranged in the movable groove 221 and an air supply device 2242 (not marked in the figure) for supplying air to the nozzle.

[0089] By adopting the above technical solution, the jacking mechanism arranged in the forming groove can jack up the formed primary glass fiber filter paper, facilitating the removal of the formed product. During operation, the output arm of the electric control cylinder extends to jack up the primary glass fiber filter paper. At the same time, the air supply device operates to supply air to the nozzle, blowing up the bottom surface of the primary glass fiber filter paper.

[0090] In a specific embodiment of the present invention, the air supply device is a compressor.

[0091] An oil separation filter paper is prepared by the production process of the oil separation filter paper.

[0092] In summary, the present invention provides an oil separation filter paper and its production process with a simple preparation process, suitable for industrial production, and better product performance.

[0093] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A production process of oil separation filter paper, characterized in that, It includes the following steps: Step 1: Raw material preparation. Add water and inorganic acid to the mixture of alkali-free glass microfiber cotton and alkali-free glass fiber short cut filaments, and stir evenly to make a pulp suspension; Step 2: Pulverizing and pulping. Add the raw materials prepared in Step 1 into a pulverizer for beating and dispersing, and filter the pulp with a filtering device to obtain the pulp; Step 3: Wet forming. Transfer the pulp obtained in Step 2 to a storage tank and dilute it to a mass concentration of 0.1 - 0.3%, and adjust the pH value to 2.0 - 3.

5. Then, transport the pulp in the storage tank to a former for forming to obtain wet paper; Step 4: Suction dewatering. Dewater the wet paper obtained in Step 3 to make the moisture content of the wet paper less than 15%; Step 5: Sizing treatment. Pass the wet paper treated in Step 4 through an impregnating tank and a spraying section respectively; Step 6: Drying treatment. Dry the wet paper treated in Step 5 to obtain a primary glass fiber filter paper; Step 7: Finished product shaping. Place the primary glass fiber filter paper obtained in Step 6 into a mold and stamp it into shape; The filtering device includes: A tank body, which has a feed pipe communicating with its inner cavity at the top; A first filter screen, which is arranged in a ring in the tank body, and the top edge thereof is hermetically connected to the inner wall of the tank body; A second filter screen, which is arranged in a ring inside the first filter screen, and its bottom is hermetically connected to the bottom of the first filter screen through a sealing plate. Among them, a filter cavity is formed between the first filter screen and the second filter screen; A first discharge pipe, which passes through the side wall of the tank body and communicates with the filter cavity; A second discharge pipe, which is arranged on the tank body and communicates with the inner cavity of the tank body; A stirring and screening mechanism, which includes a stirring and screening member arranged in the filter cavity and a driving member for driving the stirring and screening member to rotate; Among them, automatic valves are arranged on both the first discharge pipe and the second discharge pipe; The stirring and screening member includes: A rotating shaft, which is rotatably arranged in the tank body and is coaxially arranged with the tank body; A first connecting ring, which is sleeved outside the rotating shaft and is fixedly connected to the rotating shaft; A second connecting ring, which is arranged in the filter cavity; Stirring columns, which include a number of column bodies one fixedly arranged on the outer side walls of the first connecting ring and the second connecting ring and column bodies two arranged on the inner side walls of the first connecting ring and the second connecting ring, and the column bodies one and the column bodies two are alternately distributed; The mold includes: A body, which has a plurality of forming grooves thereon; A jacking mechanism, which is arranged in the forming groove and is used to jack up the primary glass fiber filter paper formed in the forming groove; The jacking mechanism includes: A movable groove, which is arranged at the bottom of the forming groove; A jacking block, which is movably embedded in the movable groove and fits the contour of the movable groove; An electric control cylinder, whose output arm is connected to the jacking block and is used to drive the jacking block to move; An air jet unit, which includes a nozzle arranged in the movable groove and a gas supply device for supplying gas to the nozzle.

2. The production process of an oil separation filter paper according to claim 1, characterized in that, In Step 1, the inorganic acid is boric acid.

3. The production process of an oil separation filter paper according to claim 1, characterized in that In Step 6, the drying treatment adopts the direct combustion method, and dries at 200 - 240 °C for 4 - 10 minutes by controlling the flame.

4. The production process of an oil separation filter paper according to claim 1, characterized in that, The driving member is a servo motor.

5. The production process of an oil separation filter paper according to claim 4, characterized in that, The gas supply device is a compressor.

6. An oil separation filter paper, characterized in that, It is prepared by the production process of the oil filter paper described in any one of claims 1 - 5.

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