CN109736136B - Water-absorbing oil-resistant filter paper and preparation method and application thereof - Google Patents
Water-absorbing oil-resistant filter paper and preparation method and application thereof Download PDFInfo
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Abstract
The invention relates to water-absorbing oil-resistant filter paper and a preparation method and application thereof, belonging to the technical field of glass fiber materials, wherein the filter paper consists of medium-alkali glass fibers with the diameter of 0.8-3.5 mu m, chopped glass fibers with the diameter of 5.0-8.0 mu m, water-soluble organic fibers and an adhesive. Wherein the mass ratio of the medium alkali glass fiber to the chopped glass fiber to the water-soluble organic fiber is 12-18:2-4:1-3, and the adhesive comprises 1.0-3.0% of a film-forming agent, 0.5-1.0% of a hydrophilic oil-repellent agent and 96.0-98.5% of a solvent in percentage by mass. The filter paper has the filtering precision of 14-16 mu m and the proportion of 85-95% of the pore size range of 15-20 mu m, has hydrophilic and oil-resistant properties, is beneficial to the separation of oil and water, is used for manufacturing an oil-gas separator, and has wide market prospect. The filter paper has simple preparation process, low cost and suitability for industrial production, and is operated.
Description
Technical Field
The invention belongs to the technical field of glass fiber materials, and particularly relates to water-absorbing oil-resistant filter paper and a preparation method and application thereof.
Background
For a long time, the difficulty in separating tiny liquid drops and oil mist carried in gas is a prominent problem in the production and transportation process of natural gas, and the operation life of a gas transportation process and the operation life of a coating in a large-scale compressor unit and a pipeline are seriously influenced. Researchers at home and abroad continuously and deeply research gas-solid filtration separation, but the researchers for gas-liquid filtration separation are relatively few, and the used filtration sample is mainly of a planar structure. At present, the gas-liquid separation separators in the market mainly comprise a liquid separating tank, a cyclone separator, a baffle type separator, a defoaming net and a high-efficiency coalescence filtering separator. Wherein, the separation effect of the liquid separation tank is poor; the baffle type separator has small regulation ratio, the separation efficiency is reduced when the flow is small, and the equipment investment is large; the regulation ratio of the defoaming net is small, when the gas flow is reduced, the separation efficiency is reduced, and meanwhile, the defoaming net can only effectively separate liquid drops larger than 10 mu m; the high-efficiency coalescence filter separator has the best separation effect, large adjustment ratio, large operation flexibility, low equipment investment and small occupied area, and can effectively separate liquid drops larger than 0.1 mu m, so the high-efficiency coalescence filter separator is a mainstream product for natural gas treatment, and the gas-liquid separation efficiency of the gas-liquid coalescence separator is mainly determined by the coalescence of a coalescence filter element, namely oil-gas filter paper.
The imported filter element is advanced in production process, so that the separation precision and efficiency are high, but the price and cost are correspondingly high. Therefore, in order to solve the problem of high operation cost of the conveying pipeline, filter elements developed and produced in China are tried to be adopted on all large natural gas conveying pipelines. Therefore, the performance detection and comparison of the domestic filter element and the imported filter element are very important. There are many parameters that affect the performance of the filter element, the most important of which are efficiency and resistance. The efficiency is related to whether the use requirement can be met, the resistance is related to the equipment allocation cost, the high efficiency and the low pressure drop are the targets pursued by the filter element, and the localization of the oil gas filter element is not slow. However, at present, domestic oil-gas separation filter paper has unreasonable fiber thickness matching and pore size distribution and cannot well gather and separate oil and water. Therefore, there is a need for a water-absorbing and oil-resistant filter paper to improve the efficiency of oil-gas separation and collection.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a water-absorbing oil-resistant filter paper; the second purpose is to provide a preparation method of the water-absorbing oil-resistant filter paper; the third purpose is to provide the application of the water-absorbing oil-resistant filter paper in an oil-gas separation/coalescence filter.
In order to achieve the purpose, the invention provides the following technical scheme:
1. a water-absorbing oil-resistant filter paper is composed of medium-alkali glass fibers with the diameter of 0.8-3.5 mu m, chopped glass fibers with the diameter of 5.0-8.0 mu m, water-soluble organic fibers and an adhesive; the mass ratio of the medium alkali glass fiber to the chopped glass fiber to the water-soluble organic fiber is 12-18:2-4: 1-3; the adhesive comprises the following components in percentage by mass: 1.0-3.0% of film-forming agent, 0.5-1.0% of hydrophilic oil-resisting agent and 96.0-98.5% of solvent.
Preferably, the water-soluble organic fiber is polyvinyl alcohol fiber.
Preferably, the film forming agent is a low polarity or non-polar film forming agent.
Preferably, the film forming agent is an acrylic emulsion.
Preferably, the hydrophilic oil-repellent agent is a composition of isocyanate and ethyl ester.
2. The preparation method of the water-absorbing oil-resistant filter paper comprises the following steps:
(1) dispersing and pulping: adding medium alkali glass fiber with the diameter of 0.8-3.5 mu m, chopped glass fiber with the diameter of 5.0-8.0 mu m and water-soluble organic fiber into a disperser together, pulping and dispersing to obtain slurry, adjusting the pH value of the slurry to be 2.0-3.0 and the mass concentration to be 1.8-2.4%, then transferring the mixed slurry into a storage tank, adjusting the pH value of the mixed slurry to be 2.5-3.5 and the mass concentration to be 0.2-0.5%;
(2) and (3) wet forming: adding water into the mixed slurry obtained in the step (1) to dilute the mixed slurry to the mass concentration of 0.1-0.3%, adjusting the pH value to 3.5-4.0, and then conveying the mixed slurry to a forming device for forming to obtain wet paper;
(3) suction dehydration: carrying out dehydration treatment on the wet paper obtained in the step (2), and then heating and drying to ensure that the moisture content of the wet paper is less than 50%;
(4) sizing: sizing one surface of the wet paper treated in the step (3) by an overflow sizing method, and vacuumizing the other surface of the wet paper which is not sized;
(5) and (3) drying: and (4) drying the wet paper treated in the step (4) to obtain the water-absorbing oil-resistant filter paper.
Preferably, in the step (3), the dehydration vacuum degree during dehydration treatment is 0.06-0.12 Mpa; the heating drying is infrared heating drying.
Preferably, in the step (4), when an overflow sizing method is adopted, the overflow speed of the adhesive is 1.0-4.0L/min, and the moving speed of the wet paper is 15-25 m/min; the vacuum degree during the vacuum pumping treatment is 0.02-0.08 Mpa.
Preferably, in the step (5), the drying treatment adopts a direct combustion method, and the drying is carried out for 4-10min at the temperature of 200-240 ℃ by controlling flame.
3. The water-absorbing oil-resistant filter paper is applied to an oil-gas separation/coalescence filter.
The invention has the beneficial effects that: the invention provides a water-absorbing oil-resistant filter paper and a preparation method and application thereof, which can ensure the strength of the finally prepared filter paper and prolong the service life of the filter paper by reasonably setting the proportion of thick and thin fibers in the filter paper, can ensure the uniform distribution of pore diameters in the finally prepared filter paper, is beneficial to improving the filtering speed of the filter paper and accelerating the working efficiency of the filter paper, and has the filtering precision of 14-16 mu m and the proportion of 85-95 percent of the pore diameters ranging from 15-20 mu m. In addition, the formula of the adhesive and the process conditions during gluing are optimized, so that the adhesive is more uniformly dispersed in the filter paper, the filter paper is better modified, and the separation of the filter paper from oil and water is favorably improved. The filter paper can be used as a core component of an oil-gas filter element, is used for manufacturing an oil-gas separator, and has wide market prospect. The filter paper is simple in preparation process, low in cost and suitable for industrial production, wherein an inclined wire forming paper machine and a direct combustion method are adopted in the preparation process, the inclined wire forming can accelerate the dehydration speed, improve the production efficiency and enable the filter paper to have good uniformity, and the direct combustion method can excessively recycle hot air, enable the material to be uniformly heated and reduce the energy consumption, so that the technical problem of a production line and the problem of energy consumption reduction are fundamentally solved.
Detailed Description
The preferred embodiments of the present invention will be described in detail below.
Example 1
Preparation of Water-absorbing oil-resistant Filter paper
(1) Dispersing and pulping: adding medium alkali glass fibers with the diameter of 0.8-3.5 microns, chopped glass fibers with the diameter of 6.0 microns and polyvinyl alcohol fibers into a disperser filled with sulfuric acid aqueous solution, pulping and dispersing for 3min at the pulping degree of 20 DEG SR to obtain slurry, adjusting the pH value of the slurry to be 2.5 and the mass concentration to be 2.0%, then transferring the mixed slurry into a storage tank, and adjusting the pH value of the mixed slurry to be 3.0 and the mass concentration to be 0.3%; the mass ratio of the alkali glass fibers, the chopped glass fibers and the polyvinyl alcohol fibers in the mixed slurry is 15:3: 2;
(2) and (3) wet forming: adding water into the mixed slurry obtained in the step (1) to dilute the mixed slurry until the mass concentration is 0.2%, adjusting the pH value to 3.5, and then conveying the mixed slurry to an inclined wire forming paper machine for forming to obtain wet paper;
(3) suction dehydration: performing suction dehydration treatment on the wet paper obtained in the step (2) under the vacuum degree of 0.08Mpa, and then performing infrared heating drying to ensure that the moisture content of the wet paper is less than 50%;
(4) sizing: sizing one surface of the wet paper treated in the step (3) by using an overflow sizing method, wherein the overflow speed of the adhesive is 2L/min, the moving speed of the wet paper is 20m/min, and simultaneously, vacuumizing the other surface of the wet paper, which is not sized, under the vacuum degree of 0.04 Mpa; wherein the adhesive comprises 1.5 percent of acrylic emulsion, 0.5 percent of isocyanate and ethyl ester composite and 98 percent of water by mass percentage,
(5) and (3) drying: and (4) drying the wet paper treated in the step (4) by adopting a direct combustion method, and drying for 6min at 220 ℃ by controlling flame to prepare the water-absorbing oil-resistant filter paper.
Example 2
Preparation of Water-absorbing oil-resistant Filter paper
(1) Dispersing and pulping: adding medium alkali glass fibers with the diameter of 0.8-3.5 microns, chopped glass fibers with the diameter of 5.0 microns and polyvinyl alcohol fibers into a disperser filled with sulfuric acid aqueous solution, pulping and dispersing for 4min at the pulping degree of 18 DEG SR to obtain slurry, adjusting the pH value of the slurry to be 3.0 and the mass concentration to be 1.8%, then transferring the mixed slurry into a storage tank, and adjusting the pH value of the mixed slurry to be 3.5 and the mass concentration to be 0.2%; the mass ratio of the alkali glass fibers, the chopped glass fibers and the polyvinyl alcohol fibers in the mixed slurry is 12:3: 3;
(2) and (3) wet forming: adding water into the mixed slurry obtained in the step (1) to dilute the mixed slurry to a mass concentration of 0.1%, adjusting the pH value to 4.0, and then conveying the mixed slurry to an inclined wire forming paper machine for forming to obtain wet paper;
(3) suction dehydration: performing suction dehydration treatment on the wet paper obtained in the step (2) under the vacuum degree of 0.06Mpa, and then performing infrared heating drying to ensure that the moisture content of the wet paper is less than 50%;
(4) sizing: sizing one surface of the wet paper treated in the step (3) by using an overflow sizing method, wherein the overflow speed of the adhesive is 3L/min, the moving speed of the wet paper is 15m/min, and simultaneously, vacuumizing the other surface of the wet paper, which is not sized, under the vacuum degree of 0.02 Mpa; wherein the adhesive comprises 3.0 percent of acrylic emulsion, 0.8 percent of isocyanate and ethyl ester composite and 96.2 percent of water in percentage by mass,
(5) and (3) drying: and (4) drying the wet paper treated in the step (4) by adopting a direct combustion method, and drying for 10min at 200 ℃ by controlling flame to obtain the water-absorbing oil-resistant filter paper.
Example 3
Preparation of Water-absorbing oil-resistant Filter paper
(1) Dispersing and pulping: adding medium alkali glass fibers with the diameter of 0.8-3.5 mu m, chopped glass fibers with the diameter of 8.0 mu m and polyvinyl alcohol fibers into a disperser filled with sulfuric acid aqueous solution, pulping and dispersing for 3min at the pulping degree of 20 DEG SR to obtain slurry, adjusting the pH value of the slurry to be 2.0 and the mass concentration to be 2.2%, then transferring the mixed slurry into a storage tank, and adjusting the pH value of the mixed slurry to be 2.5 and the mass concentration to be 0.5%; the mass ratio of the alkali glass fibers, the chopped glass fibers and the polyvinyl alcohol fibers in the mixed slurry is 18:2: 2;
(2) and (3) wet forming: adding water into the mixed slurry obtained in the step (1) to dilute the mixed slurry until the mass concentration is 0.3%, adjusting the pH value to 4.0, and then conveying the mixed slurry to an inclined wire forming paper machine for forming to obtain wet paper;
(3) suction dehydration: performing suction dehydration treatment on the wet paper obtained in the step (2) under the vacuum degree of 0.12Mpa, and then performing infrared heating drying to ensure that the moisture content of the wet paper is less than 50%;
(4) sizing: sizing one surface of the wet paper treated in the step (3) by using an overflow sizing method, wherein the overflow speed of the adhesive is 4.0L/min, the moving speed of the wet paper is 25m/min, and simultaneously, vacuumizing the other surface of the wet paper, which is not sized, under the vacuum degree of 0.08 Mpa; wherein the adhesive comprises 1.0 percent of acrylic emulsion, 1.0 percent of isocyanate and ethyl ester composite and 98 percent of water by mass percentage,
(5) and (3) drying: and (4) drying the wet paper treated in the step (4) by adopting a direct combustion method, and drying for 4min at 240 ℃ by controlling flame to prepare the water-absorbing oil-resistant filter paper.
The water-absorbing and oil-repellent filter paper prepared in examples 1 to 3 and the conventional medium effect glass fiber filter (control group) were tested for pore size distribution, oil repellency, hydrophilicity, and strength, and the test results are shown in table 1.
TABLE 1
As can be seen from Table 1, the water-absorbing and oil-repellent filter paper of the present invention has not only higher mechanical strength, but also superior hydrophilic and oil-repellent properties, as compared to conventional medium-efficiency glass fiber filter materials.
Finally, it is noted that the above-mentioned preferred embodiments illustrate rather than limit the invention, and that, although the invention has been described in detail with reference to the above-mentioned preferred embodiments, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the scope of the invention as defined by the appended claims.
Claims (10)
1. The water-absorbing oil-resistant filter paper is characterized by comprising medium-alkali glass fibers with the diameter of 0.8-3.5 mu m, chopped glass fibers with the diameter of 5.0-8.0 mu m, water-soluble organic fibers and an adhesive; the mass ratio of the medium alkali glass fiber to the chopped glass fiber to the water-soluble organic fiber is 12-18:2-4: 1-3; the adhesive comprises the following components in percentage by mass: 1.0-3.0% of film-forming agent, 0.5-1.0% of hydrophilic oil-resisting agent and 96.0-98.5% of solvent; the water-absorbing oil-resistant filter paper is prepared by the following method:
(1) dispersing and pulping: adding medium alkali glass fiber with the diameter of 0.8-3.5 mu m, chopped glass fiber with the diameter of 5.0-8.0 mu m and water-soluble organic fiber into a disperser together, pulping and dispersing to obtain slurry, adjusting the pH value of the slurry to be 2.0-3.0 and the mass concentration to be 1.8-2.4%, then transferring the mixed slurry into a storage tank, adjusting the pH value of the mixed slurry to be 2.5-3.5 and the mass concentration to be 0.2-0.5%;
(2) and (3) wet forming: adding water into the mixed slurry obtained in the step (1) to dilute the mixed slurry to the mass concentration of 0.1-0.3%, adjusting the pH value to 3.5-4.0, and then conveying the mixed slurry to a forming device for forming to obtain wet paper;
(3) suction dehydration: carrying out dehydration treatment on the wet paper obtained in the step (2), and then heating and drying to ensure that the moisture content of the wet paper is less than 50%;
(4) sizing: sizing one surface of the wet paper treated in the step (3) by an overflow sizing method, and vacuumizing the other surface of the wet paper which is not sized;
(5) and (3) drying: and (4) drying the wet paper treated in the step (4) to obtain the water-absorbing oil-resistant filter paper.
2. The water-absorbing oil-repellent filter paper as claimed in claim 1, wherein the water-soluble organic fiber is polyvinyl alcohol fiber.
3. The water-absorbing oil-resistant filter paper as claimed in claim 1, wherein the film forming agent is a low-polarity or non-polar film forming agent.
4. The water-absorbing oil-resistant filter paper as claimed in claim 3, wherein the film-forming agent is an acrylic emulsion.
5. The water and oil absorbent filter paper as claimed in claim 1, wherein the hydrophilic oil-repellent agent is a composition of isocyanate and ethyl ester.
6. The method for preparing the water-absorbing and oil-resisting filter paper as claimed in any one of claims 1 to 5, wherein the method comprises the following steps:
(1) dispersing and pulping: adding medium alkali glass fiber with the diameter of 0.8-3.5 mu m, chopped glass fiber with the diameter of 5.0-8.0 mu m and water-soluble organic fiber into a disperser together, pulping and dispersing to obtain slurry, adjusting the pH value of the slurry to be 2.0-3.0 and the mass concentration to be 1.8-2.4%, then transferring the mixed slurry into a storage tank, adjusting the pH value of the mixed slurry to be 2.5-3.5 and the mass concentration to be 0.2-0.5%;
(2) and (3) wet forming: adding water into the mixed slurry obtained in the step (1) to dilute the mixed slurry to the mass concentration of 0.1-0.3%, adjusting the pH value to 3.5-4.0, and then conveying the mixed slurry to a forming device for forming to obtain wet paper;
(3) suction dehydration: carrying out dehydration treatment on the wet paper obtained in the step (2), and then heating and drying to ensure that the moisture content of the wet paper is less than 50%;
(4) sizing: sizing one surface of the wet paper treated in the step (3) by an overflow sizing method, and vacuumizing the other surface of the wet paper which is not sized;
(5) and (3) drying: and (4) drying the wet paper treated in the step (4) to obtain the water-absorbing oil-resistant filter paper.
7. The method according to claim 6, wherein in the step (3), the degree of vacuum for dehydration is 0.06-0.12 MPa; the heating drying is infrared heating drying.
8. The method of claim 6, wherein in the step (4), when the overflow type sizing method is adopted, the overflow speed of the adhesive is 1.0-4.0L/min, and the moving speed of the wet paper is 15-25 m/min; the vacuum degree during the vacuum pumping treatment is 0.02-0.08 MPa.
9. The method as claimed in claim 6, wherein in the step (5), the drying treatment is performed by direct combustion, and drying is performed at 240 ℃ for 4-10min by controlling flame.
10. Use of a water-absorbing oil-repellent filter paper according to any one of claims 1 to 5 in an oil-gas separation/coalescence filter.
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| CN109594404A (en) * | 2019-01-22 | 2019-04-09 | 重庆纤维研究设计院股份有限公司 | High-effective water-proof glass fiber material and preparation method thereof |
| CN111962328A (en) * | 2020-08-25 | 2020-11-20 | 重庆再升科技股份有限公司 | High-efficiency oil-gas separation filter material and manufacturing method thereof |
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| CN101934172A (en) * | 2004-11-05 | 2011-01-05 | 唐纳森公司 | Filter medium and structure |
| CN103691238A (en) * | 2013-12-17 | 2014-04-02 | 成都展望能源机械有限公司 | Spiral oil-gas separator for natural gas |
| CN106413836A (en) * | 2014-05-15 | 2017-02-15 | 霍林斯沃思和沃斯有限公司 | Surface modified filter media |
| CN106968135A (en) * | 2017-04-24 | 2017-07-21 | 重庆再升科技股份有限公司 | A kind of primary glass fiber filter paper and preparation method thereof |
| CN107735155A (en) * | 2015-06-26 | 2018-02-23 | 唐纳森公司 | Complex media for The fuel stream |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US10625196B2 (en) * | 2016-05-31 | 2020-04-21 | Hollingsworth & Vose Company | Coalescing filter media |
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| CN101934172A (en) * | 2004-11-05 | 2011-01-05 | 唐纳森公司 | Filter medium and structure |
| CN103691238A (en) * | 2013-12-17 | 2014-04-02 | 成都展望能源机械有限公司 | Spiral oil-gas separator for natural gas |
| CN106413836A (en) * | 2014-05-15 | 2017-02-15 | 霍林斯沃思和沃斯有限公司 | Surface modified filter media |
| CN107735155A (en) * | 2015-06-26 | 2018-02-23 | 唐纳森公司 | Complex media for The fuel stream |
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