CN115852745A - Preparation method of glass fiber hydraulic filter paper - Google Patents
Preparation method of glass fiber hydraulic filter paper Download PDFInfo
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- CN115852745A CN115852745A CN202211578962.6A CN202211578962A CN115852745A CN 115852745 A CN115852745 A CN 115852745A CN 202211578962 A CN202211578962 A CN 202211578962A CN 115852745 A CN115852745 A CN 115852745A
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Abstract
The invention relates to the technical field of filter paper preparation, in particular to a preparation method of glass fiber hydraulic filter paper. The method comprises the following steps: mixing first glass fibers with the beating degree higher than a first preset value, second glass fibers with the beating degree lower than a second preset value, skeleton fibers and organic fibers, and adding acid liquor to adjust the pH value of the mixture to obtain fiber slurry; dewatering and forming the fiber slurry at a forming net to obtain a wet paper sheet; adding chemicals including a resin solution and an antistatic agent to a wet paper sheet; sequentially carrying out paper sheet dehydration and resin curing on the wet paper sheet added with the chemicals to obtain base paper; and compounding the non-woven fabric and the base paper through chemical glue to obtain the glass fiber hydraulic filter paper. The glass fiber hydraulic filter paper prepared by the invention has certain strength and aging resistance due to the addition of the reinforcing fiber and the aging-resistant fiber, and has antistatic property due to the addition of the antistatic agent in the glass fiber hydraulic filter paper.
Description
Technical Field
The invention relates to the technical field of filter paper preparation, in particular to a preparation method of glass fiber hydraulic filter paper.
Background
The hydraulic system can conveniently realize stepless speed regulation in a larger range, has good low-speed performance and stable work, is easy to realize discontinuous and continuous motion and frequent reversing, can well reduce the impact and vibration phenomena, and is widely applied to various industries. The safety of the hydraulic system is inseparable from the operation safety of the aircraft, 70-80% of faults of the hydraulic system are caused by oil pollution, and the existence of solid particles in the oil can cause abrasion, stripping, contact fatigue, siltation and corrosion of the hydraulic system, thereby seriously affecting the safe operation of the aircraft. Therefore, the removal of the particulate matters in the hydraulic oil is a key link for guaranteeing the normal operation of the airplane, and has great significance.
The glass fiber filter material gradually replaces ceramic fiber filter materials and metal sintering filter materials due to the advantages of corrosion resistance, high temperature resistance and excellent filter performance, occupies a leading position in the hydraulic filter market, and is the research focus in the field of aviation hydraulic filter. In the hydraulic system of the aerospace plane, the strength, aging resistance and antistatic ability of the filter paper are important concerns about stable operation of the hydraulic system of the plane. Therefore, the development of the high-strength, aging-resistant and antistatic glass fiber hydraulic filter paper suitable for the aircraft hydraulic system is very important, and is a problem to be solved at present in China.
Therefore, a method for preparing the glass fiber hydraulic filter paper is needed to solve the above problems.
Disclosure of Invention
One or more embodiments of the invention describe a preparation method of glass fiber hydraulic filter paper, which can be used for preparing high-strength, aging-resistant and antistatic glass fiber hydraulic filter paper suitable for an aircraft hydraulic system.
One embodiment of the present disclosure provides a method for preparing a glass fiber hydraulic filter paper, including:
mixing first glass fibers with the beating degree higher than a first preset value, second glass fibers with the beating degree lower than a second preset value, skeleton fibers and organic fibers, and adding acid liquor to adjust the pH value of the mixture to obtain fiber slurry;
dewatering and forming the fiber slurry at a forming wire to obtain a wet paper sheet;
adding a resin to the wet paper web chemicals of solution and antistatic agent;
sequentially carrying out paper sheet dehydration and resin curing on the wet paper sheet added with the chemicals to obtain base paper;
and compounding the non-woven fabric and the base paper through chemical glue to obtain the glass fiber hydraulic filter paper.
According to the above embodiment, the first preset value is 30 ° SR, and the second preset value is 20 ° SR.
According to the above embodiment, the skeleton fibers are opener filaments; and/or the presence of a gas in the gas,
the organic fiber comprises at least one of PET/PP bi-component fiber, aramid fiber, polyimide and polyester cellulose.
According to the above embodiment, the proportions of the first glass fiber, the second glass fiber, the skeleton fiber and the organic fiber are, in this order, 10 to 30%, 20 to 50%, 5 to 20% and 1 to 5%.
According to the above embodiment, when dewatering forming is performed, two vacuum suction slits are respectively provided at the forming wire, wherein the pressure of one vacuum suction slit is 0.02 to 0.04MPa, and the pressure of the other vacuum suction slit is 0.01 to 0.02MPa.
According to the above embodiment, the resin in the resin solution includes at least one of acrylic resin, phenol resin, melamine resin, epoxy resin, urea resin, and polyvinyl acetate.
According to the above embodiment, the antistatic agent includes at least one of a radical sulfonic acid, a phosphoric acid, a dithiocarbamic acid, an ethoxylated alkylamine, an ethoxylated lauryl amine, and glycerol monostearate.
According to the above embodiment, the concentration of the chemical is 4 to 6%, and the concentration of the antistatic agent is 0.05 to 1.5%.
According to the embodiment, the resin is cured in a partitioned and/or segmented mode, and the curing temperature is 100-150 ℃.
According to the above embodiment, the chemical adhesive is a hot melt adhesive in a type including at least one of an ethylene-vinyl acetate copolymer type, a polyamide type, a polyester type, and a polyurethane type, or a pressure-sensitive adhesive in a type including at least one of a solvent type, an emulsion type, and a hot melt type.
According to the preparation method of the glass fiber hydraulic filter paper provided by the embodiment of the invention, the reinforcing fiber and the anti-aging fiber are added in the formula, so that the glass fiber hydraulic filter paper has certain strength and anti-aging capability, the antistatic agent is added in the glass fiber hydraulic filter paper, the glass fiber hydraulic filter paper has the anti-static capability, the glass fiber hydraulic filter paper also has the high temperature resistance, the 5-micron filtration ratio is more than 500, the filtering assembly requirements of a hydraulic system are met, and the preparation method has a wide application prospect.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 shows a schematic flow diagram of a method for making fiberglass hydraulic filter paper according to one embodiment;
FIG. 2 is a schematic structural diagram of the glass fiber hydraulic filter paper prepared according to the process shown in FIG. 1;
FIG. 3 is a graph showing the longitudinal strength change of the glass fiber hydraulic filter paper prepared according to the process shown in FIG. 1;
FIG. 4 shows a cross-sectional electron micrograph of the glass fiber hydraulic filter paper prepared according to the process shown in FIG. 1.
Reference numerals:
1-an upper support layer;
2-a substrate layer;
3-a chemical glue layer;
4-lower support layer.
Detailed Description
The scheme provided by the invention is described below by combining the accompanying drawings.
Fig. 1 shows a schematic flow diagram of a method for preparing glass fiber hydraulic filter paper according to an embodiment.
As shown in fig. 1, the preparation method of the glass fiber hydraulic filter paper comprises the following steps:
100, blending first glass fibers with the beating degree higher than a first preset value, second glass fibers with the beating degree lower than a second preset value, skeleton fibers and organic fibers, and adding acid liquor to adjust the pH value of the blended materials to obtain fiber slurry;
104, adding chemicals comprising a resin solution and an antistatic agent to the wet paper sheet;
and 108, compounding the non-woven fabric and the base paper through chemical glue to obtain the glass fiber hydraulic filter paper.
In the embodiment, the reinforced fiber and the anti-aging fiber are added in the formula, so that the fiber has certain strength and anti-aging capability, the antistatic agent added in the fiber has the antistatic capability, the glass fiber also has high temperature resistance, the 5-micron filtration ratio is more than 500, the filtering and assembling requirements of a hydraulic system are met, and the fiber has a wide application prospect.
It can be known that, through the process shown in fig. 1, the glass fiber hydraulic filter paper suitable for the aircraft hydraulic system with high strength, aging resistance and antistatic property can be prepared (see fig. 2 for a specific structure). As shown in fig. 2, the structure of the filter paper includes a substrate layer 2 (hereinafter, referred to as base paper), an upper support layer 1 (hereinafter, referred to as non-woven fabric) disposed on an upper surface of the substrate layer 2, a lower support layer 4 (hereinafter, referred to as non-woven fabric) disposed on a lower surface of the substrate layer 2, and chemical glue layers 3 (hereinafter, referred to as chemical glue) disposed between the substrate layer 2 and the upper support layer 1 and between the substrate layer 2 and the lower support layer 4. The substrate layer 2 of the glass fiber filter paper is prepared with a surface chemical modification solution and added with reinforcing fibers to obtain filter paper base paper with a specific function; the upper support layer 1 and the lower support layer 4 are both nonwoven fabric layers, and may be any of nonwoven fabrics such as meltblown, wet laid, spunbond, and the like, for example. The glass fiber hydraulic filter paper can have a double-layer or multi-layer structure according to requirements, and is not limited herein.
The above steps are sequentially described in the following order.
With respect to step 100:
in one embodiment of the present invention, the first preset value is 30 ° SR and the second preset value is 20 ° SR. For example, the first glass fibers may have a freeness of 35 ° SR, 40 ° SR, 45 ° SR, and 50 ° SR, but may have other values higher than 30 ° SR, and the freeness of the first glass fibers is not limited herein. Similarly, the freeness of the second glass fiber may be 10 ° SR, 12 ° SR, 14 ° SR, 16 ° SR, 18 ° SR, or may be other values lower than 20 ° SR, and the freeness of the second glass fiber is not limited herein.
In one embodiment of the invention, the skeletal fibers are open-end filaments.
In one embodiment of the present invention, the organic fiber includes at least one of PET/PP bicomponent fiber, aramid fiber, polyimide, and polyester cellulose.
In this embodiment, the PET/PP bicomponent fiber may be sheath-core type or embedded type, etc., and the addition of the PET/PP bicomponent fiber can reduce the tightness of the filter paper to increase the porosity of the filter paper; in addition, due to the fact that the melting points of the two-component organic fibers are different, after high-temperature treatment, the fibers can be used as a recessive adhesive in the filter paper when the fibers are molten, and therefore the strength of the filter paper is improved and the temperature resistance of the filter paper is guaranteed by adding the organic fibers.
In one embodiment of the present invention, the proportions of the first glass fiber, the second glass fiber, the skeleton fiber and the organic fiber are, in order, 10 to 30%, 20 to 50%, 5 to 20% and 1 to 5%.
With respect to step 102:
when the wet paper sheet is formed, the internal structure distribution of the fibers can be adjusted according to the requirement, and the moisture content of the formed wet paper sheet of the filter paper is 20-40%. The gram weight of the filter paper base paper is 70-85 gsm.
In one embodiment of the invention, two vacuum suction slits are respectively arranged at the forming wire when dewatering and forming are carried out, wherein the pressure of one vacuum suction slit is 0.02-0.04 MPa, and the pressure of the other vacuum suction slit is 0.01-0.02 MPa. By the arrangement, the fiber density of the filter paper base paper can be increased regularly in the longitudinal direction, and the resistance of the filter paper can be reduced while the filtering precision is ensured.
In some embodiments, the forming wire may be a three-dimensional woven structure having a high fiber retention.
With respect to step 104:
the resin solution is usually added after the wet paper sheet is formed to make entanglement between fibers in the filter paper stronger. In one embodiment of the present invention, the resin in the resin solution includes at least one of acrylic resin, phenol resin, melamine resin, epoxy resin, urea resin, and polyvinyl acetate.
The antistatic agent can be added into the resin solution according to the proportion to chemically modify the filter paper, and the adding concentration is usually 0.05-1.5%; or the solution can be independently sprayed on the surface of the filter paper base paper. In one embodiment of the present invention, the antistatic agent comprises at least one of a radical sulfonic acid, phosphoric acid, dithiocarbamic acid, ethoxylated alkylamine, ethoxylated lauryl tyramine, and glycerol monostearate.
In one embodiment of the present invention, the concentration of the chemical is 4 to 6% and the concentration of the antistatic agent is 0.05 to 1.5%.
For step 106:
the wet paper applied with chemicals firstly needs vacuum suction to make the internal glue solution more uniform and play a certain dewatering role, and then is further dried by an oven or a drying cylinder, and then the internal chemicals need to be solidified. The chemicals need to be crosslinked at a suitable temperature to complete the curing, and in one embodiment of the present invention, the resin curing is performed in a zoned and/or segmented manner, and the curing temperature is 100-150 ℃.
For step 108:
in one embodiment of the present invention, the chemical adhesive is a hot melt adhesive in a form of at least one of an ethylene-vinyl acetate copolymer type, a polyamide type, a polyester type and a polyurethane type, or a pressure-sensitive adhesive in a form of at least one of a solvent type, an emulsion type and a hot melt type. The chemical glue is usually applied on the non-woven fabric, when the glass fiber filter paper base paper is compounded, the temperature of a hot roller is set to be 100-200 ℃, the speed is 10-20 m/min, and the compounding pressure is 10-20 Psi.
In conclusion, the technical scheme of the invention can prepare the high-strength glass fiber hydraulic filter paper with certain ageing resistance, high temperature resistance and antistatic capacity.
The technical solution of the present invention is described below with reference to two embodiments.
Example 1:
preparing glass fiber hydraulic filter paper base paper: the 49 DEG SR glass fiber, the 19 DEG SR glass fiber, the 0.3DPET fiber, the polyester cellulose fiber and the 7 mu m 6mm glass fiber open-cut filament are respectively mixed according to the proportion of 30 percent, 50 percent, 2 percent, 3 percent and 15 percent, and sulfuric acid is added during beating to adjust the pH value to be 2 to 3. The slurry is dewatered at a forming wire to form a wet sheet. The dehydration department sets up two vacuum suction seams respectively, and first vacuum suction pressure sets up to 0.04MPa, and second vacuum suction pressure sets up to 0.02MPa, can make filter paper base paper fiber density present the regularity and increase gradually trend in longitudinal direction like this, reduces the filter paper resistance when guaranteeing filtration accuracy.
Preparing chemicals: the surface of the base paper is treated by using acrylic emulsion, two resins of thermosetting resin and thermoplastic resin are commonly used in a compounding way, the solid content of the thermosetting resin is 45-50%, the solid content of the thermoplastic resin is 40-45%, the proportion of the thermosetting resin to the thermoplastic resin is 20, in addition, 2% of antistatic agent is added, and the selected antistatic agent is ethoxylated alkylamine. The concentration of the total chemical treatment solution is 5%, the prepared solution is uniformly sprayed on the surface of the base paper through a spray header, and then the chemical solution on the surface is sucked into the base paper through vacuum suction.
Curing the resin: the method adopts a partition/sectional curing mode, and totally sets five temperature areas, wherein the temperature settings from front to back are respectively 100 ℃, 110 ℃, 120, 130 and 140 ℃.
The gram weight of the product is 70g/m 2 Glass fiber hydraulic filter paper base paper.
The composite paper is characterized in that 18g of melt-blown non-woven fabric and glass fiber hydraulic filter paper base paper are compounded, the upper layer and the lower layer are non-woven fabric layers, a bonding layer of the non-woven fabric layers and the base paper is a chemical glue layer, and PA glue is preferably selected as the chemical glue layer. The hot roll temperature was set at 160 deg.C, the vehicle speed 15m/min, and the composite pressure 15Psi. Successfully prepare the high-strength, aging-resistant and antistatic glass fiber hydraulic filter paper as shown in figure 2.
The prepared high-strength, aging-resistant and antistatic glass fiber hydraulic filter paper gradually tends to be stable in longitudinal strength change along with the increase of time under the condition of hot oil at 150 ℃, and the final strength is higher than that of ordinary filter paper, as shown in figure 2. The internal structure of the filter paper is shown in figure 3, and the test proves that the 5 micron filtration ratio is more than or equal to 500, and the pollutant holding capacity is 115g/m 2 。
Example 2:
preparing glass fiber hydraulic filter paper base paper: the preparation method comprises the steps of respectively mixing 49-degree SR glass fiber, 19-degree SR glass fiber, 0.5D aramid fiber and 7-micron 6-mm glass fiber opener according to the proportion of 40%, 42%, 3% and 15%, and adding sulfuric acid to adjust the pH value to be 2-3 during pulping. The 49 DEG SR glass fiber is separately arranged in a slurry tank A; the 19 DEG SR glass fiber and other raw materials are placed in another pulp tank, B pulp tank. The slurry is distributed by two slurry distributors to form a filter paper layer with larger difference on the forming net, fine fibers are sucked into the coarse fiber framework by vacuum suction to form a compact structure, the pressure of the first vacuum suction is set to be 0.04MPa, and the pressure of the second vacuum suction is set to be 0.02MPa.
Preparing chemicals: the chemical is made of aging-resistant water-based phenolic resin, 2% of antistatic agent and ethoxy lauryl tyramine are added, the chemical application concentration is 5%, the chemical is uniformly applied to the surface of paper sheets through a spraying device, and then the chemical solution on the surface is sucked into the paper sheets through vacuum suction.
Curing the resin: the method adopts a partition/sectional curing mode, totally sets five temperature areas, and the temperature settings from front to back are respectively 100 ℃, 120 ℃, 140 ℃, 160 ℃ and 160 ℃.
The glass fiber hydraulic filter paper base paper with the gram weight of 75g/m < 2 > is prepared according to the steps.
The method is characterized in that 18g of melt-blown non-woven fabric and glass fiber hydraulic filter paper base paper are compounded, the upper layer and the lower layer are non-woven fabric layers, the bonding layer of the non-woven fabric layers and the base paper is a chemical glue layer, and PA glue is preferably selected as the chemical glue layer. The hot roll temperature was set at 160 deg.C, the vehicle speed 15m/min, and the composite pressure 15Psi.
The average longitudinal strength of the prepared high-strength, aging-resistant and antistatic glass fiber hydraulic filter paper is 2.1N/mm, the strength is reduced to 1.5KN/m after the filter paper is soaked in hot oil at 150 ℃ for 24 hours, and the strength is still maintained in an appreciable range. The test shows that the 5 micron filtration ratio is 587, and the pollutant holding capacity is 143g/m 2 。
The foregoing description of specific embodiments of the present invention has been presented. Other embodiments are within the scope of the following claims. In some cases, the actions or steps recited in the claims can be performed in a different order than in the embodiments and still achieve desirable results. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some embodiments, multitasking and parallel processing may also be possible or may be advantageous.
The embodiments of the present invention are described in a progressive manner, and the same and similar parts among the embodiments can be referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, as for the apparatus embodiment, since it is substantially similar to the method embodiment, the description is relatively simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
The above-mentioned embodiments, objects, technical solutions and advantages of the present invention are further described in detail, it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made on the basis of the technical solutions of the present invention should be included in the scope of the present invention.
Claims (10)
1. The preparation method of the glass fiber hydraulic filter paper is characterized by comprising the following steps:
mixing first glass fibers with the beating degree higher than a first preset value, second glass fibers with the beating degree lower than a second preset value, skeleton fibers and organic fibers, and adding acid liquor to adjust the pH value of the mixture to obtain fiber slurry;
dewatering and forming the fiber slurry at a forming wire to obtain a wet paper sheet;
adding chemicals including a resin solution and an antistatic agent to the wet paper sheet;
sequentially carrying out paper sheet dehydration and resin curing on the wet paper sheet added with the chemicals to obtain base paper;
and compounding the non-woven fabric and the base paper through chemical glue to obtain the glass fiber hydraulic filter paper.
2. The method for preparing the glass fiber hydraulic filter paper according to claim 1, wherein the first preset value is 30 ° SR, and the second preset value is 20 ° SR.
3. The method for preparing the glass fiber hydraulic filter paper according to claim 1, wherein the skeleton fiber is a cutter opening filament; and/or the presence of a gas in the gas,
the organic fiber comprises at least one of PET/PP bi-component fiber, aramid fiber, polyimide and polyester cellulose.
4. The method for preparing the glass fiber hydraulic filter paper according to claim 1, wherein the proportions of the first glass fiber, the second glass fiber, the skeleton fiber and the organic fiber are 10-30%, 20-50%, 5-20% and 1-5% in sequence.
5. The method for preparing the glass fiber hydraulic filter paper according to claim 1, wherein two vacuum suction slits are respectively arranged at the forming wire during the dehydration forming, wherein the pressure of one vacuum suction slit is 0.02-0.04 MPa, and the pressure of the other vacuum suction slit is 0.01-0.02 MPa.
6. The method for preparing the glass fiber hydraulic filter paper as claimed in claim 1, wherein the resin in the resin solution comprises at least one of acrylic resin, phenolic resin, melamine resin, epoxy resin, urea resin and polyvinyl acetate.
7. The method for preparing the glass fiber hydraulic filter paper according to claim 1, wherein the antistatic agent comprises at least one of radical sulfonic acid, phosphoric acid, dithiocarbamic acid, ethoxylated alkylamine, ethoxylated lauryl tyramine and glycerol monostearate.
8. The method for preparing the glass fiber hydraulic filter paper according to claim 1, wherein the concentration of the chemical is 4-6%, and the concentration of the antistatic agent is 0.05-1.5%.
9. The preparation method of the glass fiber hydraulic filter paper as claimed in claim 1, wherein the resin is cured in a partitioned and/or segmented manner, and the curing temperature is 100-150 ℃.
10. The method for preparing the glass fiber hydraulic filter paper according to any one of claims 1 to 9, wherein the chemical adhesive is a hot melt adhesive or a pressure sensitive adhesive, the type of the hot melt adhesive comprises at least one of ethylene-vinyl acetate copolymer type, polyamide type, polyester type and polyurethane type, and the type of the pressure sensitive adhesive comprises at least one of solvent type, emulsion type and hot melt type.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110820423A (en) * | 2019-09-29 | 2020-02-21 | 中材科技股份有限公司 | Glass fiber filter paper with gradient structure and preparation method and application thereof |
| CN114086425A (en) * | 2021-11-23 | 2022-02-25 | 上海邀加科技有限公司 | Novel glass fiber net construction method |
| CN115300996A (en) * | 2022-08-19 | 2022-11-08 | 山东仁丰特种材料股份有限公司 | High-temperature-resistant hydraulic composite glass fiber filter material, preparation process thereof and composite device |
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- 2022-12-05 CN CN202211578962.6A patent/CN115852745A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110820423A (en) * | 2019-09-29 | 2020-02-21 | 中材科技股份有限公司 | Glass fiber filter paper with gradient structure and preparation method and application thereof |
| CN114086425A (en) * | 2021-11-23 | 2022-02-25 | 上海邀加科技有限公司 | Novel glass fiber net construction method |
| CN115300996A (en) * | 2022-08-19 | 2022-11-08 | 山东仁丰特种材料股份有限公司 | High-temperature-resistant hydraulic composite glass fiber filter material, preparation process thereof and composite device |
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