Integrated forming device, glass fiber filter material and preparation method and application thereof

Abstract

The application relates to a glass fiber paper / non-woven fabric integrated forming device, a glass fiber filter material and a preparation method and application thereof. The method comprises the following steps: mixing glass fibers, a dispersing agent and water to obtain a glass fiber slurry; spreading PE or PET non-woven fabric on a paper forming net; applying the glass fiber slurry to the non-woven fabric to form a glass fiber paper film, thereby obtaining a non-woven fabric paper film; pressing the non-woven fabric glass fiber paper film; performing primary drying on the pressed non-woven fabric glass fiber paper film, thereby obtaining non-woven fabric glass fiber paper; applying sizing to the obtained dried paper film, and then performing secondary drying and solidification. The technical problem to be solved is that the glass fiber is integrated with the non-woven fabric, the glass fiber cotton is formed by sinking on the non-woven fabric, the non-woven fabric provides strength for the glass fiber filter material, and the production line light and thin glass fiber filter material forming is realized; and the deployment of thick and thin glass fibers is performed, so that the glass fiber filter material is simultaneously realized to be light and thin, high in strength, high in pollution capacity, high in filtering precision and excellent in performance.

Description

Technical Field

[0001] This invention relates to the field of fiber filter material technology, and in particular to an integrated glass fiber paper / nonwoven fabric molding device, glass fiber filter material, its preparation method and application. Background Technology

[0002] Energy conservation and emission reduction policies are guiding various sectors towards rapid development towards high precision and lightweight designs. In the automotive, shipbuilding, heavy-duty vehicle, thermal power, nuclear power, and machining equipment industries, control systems are becoming increasingly sophisticated, leading to increasingly stringent requirements for the purity of lubricating oils, engine oils, and hydraulic oils used in systems such as turbines, generators, and engines. Filter media in filter elements are key materials used to remove metal particles and contaminants from fluid media, protecting the normal operation of machinery and equipment. Excellent filtration accuracy and dirt-holding capacity, along with high strength and lightweight design, represent important future directions for filter media development.

[0003] Currently, filter media mainly focus on plant fiber and metal fiber filter media. Plant fibers can intertwine and are connected by numerous hydrogen bonds, resulting in high wet strength and simple membrane formation, easily achieving thin and lightweight filter paper. However, plant fibers fail due to excessively high ambient temperatures during the filtration of engine oil and hydraulic oil. Metal fiber filter media meet the strength and high-temperature resistance requirements for oil filtration, but the high density of metal materials and the coarse diameter of metal fibers result in heavy filter media with lower filtration accuracy. Glass fiber, due to its low density, high temperature resistance, and filament diameter down to a few hundred nanometers, holds promise as a replacement for traditional plant fiber and metal fiber filter media, achieving breakthroughs in lightweight, high-precision filter media. However, glass fiber lacks abundant functional groups on its surface and has high stiffness, making it difficult to intertwine and form a membrane. Glass fiber-based filter media also has low wet strength, making paper formation difficult. Furthermore, the thickness of glass fiber filter media significantly affects filtration accuracy and dirt-holding capacity; therefore, current glass fiber-based filter media are generally thick and heavy, making it difficult to achieve lightweight requirements. Summary of the Invention

[0004] In view of this, the main objective of the present invention is to provide an integrated glass fiber paper / non-woven fabric molding device, glass fiber filter material, its preparation method and application. The technical problem to be solved is that by integrating glass fiber and non-woven fabric, glass fiber cotton is deposited and formed on the non-woven fabric, and the non-woven fabric provides strength to the glass fiber filter material, realizing the molding of thin and light glass fiber filter material in the production line; furthermore, by adjusting the coarse and fine glass fibers, the glass fiber filter material is simultaneously made thin and light, with high tensile strength, high burst strength, high dirt holding capacity and high filtration accuracy.

[0005] The objective of this invention and the technical problem it solves are achieved through the following technical solution. This invention proposes a method for preparing glass fiber filter material, comprising the following steps:

[0006] 1) Mix glass fiber, dispersant and water to obtain glass fiber slurry;

[0007] 2) Lay PE or PET nonwoven fabric on the paper forming mesh;

[0008] 3) Apply the glass fiber slurry obtained in step 1) onto PE or PET nonwoven fabric to form a glass fiber paper film, thereby obtaining a nonwoven paper film;

[0009] 4) Press the non-woven paper film obtained in step 3) to obtain a non-woven glass fiber paper film;

[0010] 5) The nonwoven glass fiber paper film obtained in step 4) is initially dried to obtain nonwoven glass fiber paper.

[0011] 6) Apply sizing to the non-woven fiberglass paper obtained in step 5), and then perform a second drying and curing process to obtain fiberglass filter material.

[0012] Preferably, in the aforementioned method for preparing glass fiber filter material, in step 1), the mass ratio of glass fiber to dispersant is 100:1 to 2000:1.

[0013] Preferably, in the aforementioned method for preparing glass fiber filter material, in step 1), the diameter of the glass fiber is 0.1 μm to 10 μm.

[0014] Preferably, in the aforementioned method for preparing glass fiber filter material, in step 2), the basis weight of the PE or PET nonwoven fabric is 10 g / m². 2 ~40g / m 2 .

[0015] Preferably, in the aforementioned method for preparing glass fiber filter material, in step 3), the concentration of the glass fiber slurry is 0.0001 g / ml to 0.008 g / ml.

[0016] Preferably, in the aforementioned method for preparing glass fiber filter material, in step 3), the rotation speed of the forming mesh is 4m / min to 40m / min.

[0017] Preferably, in the aforementioned method for preparing glass fiber filter material, in step 4), the pressing load is 5N to 80N.

[0018] Preferably, in the aforementioned method for preparing glass fiber filter material, in step 5), the initial drying temperature is 80–150°C.

[0019] Preferably, in the aforementioned method for preparing glass fiber filter material, in step 6), the amount of sizing applied is 5-10 wt% based on the mass of the nonwoven glass fiber paper.

[0020] Preferably, in the aforementioned method for preparing glass fiber filter material, in step 6), the temperature for the secondary drying and curing is 120–210°C.

[0021] The objectives of this invention and the technical problems it solves can be further achieved by the following technical measures. This invention proposes a glass fiber filter material, which includes a glass fiber paper membrane and at least one non-woven fabric layer disposed on the glass fiber paper membrane.

[0022] Preferably, in the aforementioned glass fiber filter material, the thickness of the glass fiber filter material is less than 0.5 mm and the basis weight is less than 60 g / m³. 2 It has a tensile strength greater than 24N, a bursting strength greater than 210MPa, and a temperature resistance greater than or equal to 180℃.

[0023] Preferably, in the aforementioned glass fiber filter material, the glass fiber paper membrane is made of glass fiber.

[0024] Preferably, in the aforementioned glass fiber filter material, the basis weight of the nonwoven fabric layer is 10 g / m². 2 -40g / m 2 .

[0025] Preferably, in the aforementioned glass fiber filter material, the number of layers of the nonwoven fabric layer is one or two.

[0026] Preferably, in the aforementioned glass fiber filter material, the number of layers of the nonwoven fabric layer is two, and the two nonwoven fabric layers are nonwoven fabrics of the same or different densities.

[0027] Preferably, in the aforementioned glass fiber filter material, the glass fiber filter material is prepared by the method described above.

[0028] The objectives of this invention and the technical problems it solves can be further achieved by the following technical measures. This invention proposes a filter material comprising a filter layer, wherein the filter layer is made of the aforementioned glass fiber filter material.

[0029] The objectives of this invention and the solutions to its technical problems can be further achieved by the following technical measures. This invention proposes an integrated glass fiber filter material / non-woven fabric molding device, which includes a feeding unit and a molding unit. The molding unit is placed on one side of the feeding unit. The feeding unit includes a support frame, on which a non-woven fabric feeding roller and a non-woven fabric spreading roller are fixedly supported. The molding unit includes a headbox and a molding net that supports the non-woven fabric and moves together with it.

[0030] By employing the above technical solutions, the glass fiber paper / non-woven fabric integrated molding device, glass fiber filter material, its preparation method, and its application provided by the present invention have at least the following advantages:

[0031] This invention utilizes the direct formation of glass fiber paper membranes on nonwoven fabrics, which is more advanced than the traditional method of preparing glass fiber filter paper. It overcomes the problem that glass fiber paper membranes have low wet strength and cannot be used to make paper. By leveraging the strength of nonwoven fabrics, ultra-thin glass fiber paper can be prepared.

[0032] The glass fiber filter material of this invention has a thickness of less than 0.5 mm and a basis weight of less than 60 g / m³. 2 It has a tensile strength greater than 24N, a bursting strength greater than 210MPa, and a temperature resistance greater than or equal to 180℃.

[0033] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, the preferred embodiments of the present invention are described in detail below. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the integrated glass fiber paper / non-woven fabric forming device of the present invention, wherein: non-woven fabric spreading roller-1; non-woven fabric feeding roller-2; support frame-3; headbox-4; non-woven fabric-5; forming net-6; feeding unit-7; forming unit-8. Detailed Implementation

[0035] To further illustrate the technical means and effects adopted by the present invention to achieve its intended purpose, the following detailed description, in conjunction with preferred embodiments, provides a detailed explanation of the specific implementation methods, structures, features, and effects of the integrated glass fiber paper / non-woven fabric molding device, glass fiber filter material, its preparation method, and applications based on the present invention. In the following description, different "embodiments" or "embodiments" do not necessarily refer to the same embodiment. Furthermore, specific features, structures, or characteristics in one or more embodiments can be combined in any suitable manner.

[0036] like Figure 1 As shown, some embodiments of the present invention provide a glass fiber paper / non-woven fabric integrated molding device, which includes a feeding unit 7 and a molding unit 8. The molding unit 8 is placed on one side of the feeding unit 7. The feeding unit 7 includes two supports 3, on which a non-woven fabric spreading roller 1 and a non-woven fabric feeding roller 2 are respectively fixedly supported. The molding unit 8 includes a headbox 4 and a molding net 6 that supports the non-woven fabric 5 and moves together with the non-woven fabric 5. The headbox 4 is arranged above the molding net 6. This arrangement is beneficial for operation, installation, and maintenance, and also saves space.

[0037] Furthermore, the headbox 4 is equipped with a discharge pipe, which is connected to the feed end of the forming mesh 6 to inject the fiberglass slurry into the feed end of the forming mesh 6. This arrangement helps to improve space utilization and facilitates operation.

[0038] In addition, some embodiments of the present invention provide a method for preparing glass fiber filter material, comprising the following steps:

[0039] 1) Weigh glass fibers and dispersant according to the specified ratio, and add them to a mixing tank with water at a mass ratio of 100:1 to 2000:1. Mix and stir to obtain glass fiber slurry. If the mass ratio is lower than 100:1 or higher than 2000:1, the glass fibers will not be sufficiently dispersed. The diameter of the glass fibers can be 0.1μm to 10μm (including glass fibers prepared by conventional drawing, spinning, and other processes). Coarse fibers can better improve dirt-holding capacity, while fine fibers can effectively improve filtration efficiency. Specifically, the dispersant can be sodium silicate dispersant.

[0040] 2) Lay PE or PET nonwoven fabric on the paper forming wire of the papermaking equipment; the basis weight of the PE or PET nonwoven fabric can be 10 g / m². 2 ~40g / m 2 Less than 10g / m 2 Nonwoven fabrics with too low a thickness are prone to deformation; a thickness greater than 40 g / m² is also acceptable. 2 Excessive thickness and poor air permeability can lead to fiberglass buildup, which is detrimental to paper production.

[0041] 3) The glass fiber slurry in the mixing tank is drawn into the distributor. The glass fiber slurry concentration is in the range of 0.0001 g / ml to 0.008 g / ml, and the forming wire rotation speed is in the range of 4 m / min to 40 m / min. The wire density and speed are adjusted using the controller of conventional papermaking equipment. Glass fiber paper film is formed on the nonwoven fabric from step 2), resulting in a nonwoven paper film. The drawing can be done using any existing method for glass fiber slurry drawing, and this invention is not specifically limited to it. The concentration of glass fiber slurry and the rotation speed of the forming wire are adjusted in coordination. If the concentration is less than 0.0001 g / ml, the glass fiber slurry concentration is too low; if the speed is greater than 40 m / min, the forming wire speed is too fast, and continuous paper cannot be formed. If the concentration is greater than 0.008 g / ml, the glass fiber slurry concentration is too high; if the speed is less than 4 m / min, the forming wire speed is too low, which will lead to glass fiber accumulation.

[0042] 4) Press the non-woven paper film obtained in step 3) with a load of 5N to 80N to obtain a non-woven glass fiber paper film; if the load is higher than 80N, it will be too high and crush the glass fiber; if the load is lower than 5N, it will be too low and cannot effectively squeeze out the moisture in the paper film and cannot guarantee the flatness of the paper.

[0043] 5) The nonwoven glass fiber paper film obtained in step 4) is initially dried at 80-150℃ to obtain nonwoven glass fiber paper. If the temperature is below 80℃, it is too low to dry; if the temperature is above 150℃, it is too high and will result in wasted energy.

[0044] 6) Apply 5-10 wt% (based on the mass of the nonwoven fiberglass paper) of adhesive to the nonwoven fiberglass paper obtained in step 5), and then perform a secondary drying and curing at 120-210℃ to obtain the fiberglass filter material. If the adhesive application is less than 5 wt%, the adhesive content is too low and will not stabilize the fibers of the fiberglass paper; if the adhesive application is greater than 10 wt%, the adhesive content is too high and will clog the pores. Considering the curing of the adhesive, a temperature range of 120-210℃ is selected; if the temperature is below 120℃, the adhesive will not cure and the strength of the filter material will not be improved; if the temperature is above 210℃, the temperature is too high, wasting resources and damaging the adhesive. Through secondary drying and curing, the glass fibers are less likely to be scattered, the nonwoven fabric and fiberglass paper are more firmly bonded, and the overall strength of the filter material is higher.

[0045] In addition, some embodiments of the present invention also provide a glass fiber filter material, the glass fiber filter material comprising a glass fiber paper membrane and at least one non-woven fabric layer disposed on the glass fiber paper membrane; the thickness of the glass fiber filter material is less than 0.5 mm, and the basis weight is less than 60 g / m³. 2 It has a tensile strength higher than 24N, a bursting strength higher than 210MPa, and a temperature resistance greater than or equal to 180℃. The fiberglass paper film is composed of glass fibers. The nonwoven fabric has a basis weight of 10g / m². 2 -40 g / m 2 The fiberglass filter material is prepared by the method described above. For example, the number of nonwoven fabric layers can be one or two, depending on the magnitude of all external forces acting on the filter material during use. The two nonwoven fabric layers can be nonwoven fabrics of the same or different densities.

[0046] Furthermore, some embodiments of the present invention also provide a filter material comprising a filter layer, wherein the filter layer is made of the aforementioned glass fiber filter material.

[0047] The present invention will be further described below with reference to specific embodiments, but this should not be construed as a limitation on the scope of protection of the present invention. Some non-essential improvements and adjustments made by those skilled in the art based on the above description of the present invention still fall within the scope of protection of the present invention.

[0048] Unless otherwise specified, all materials and reagents mentioned below are commercially available products well known to those skilled in the art; unless otherwise specified, all methods described are methods known in the art. Unless otherwise defined, the technical or scientific terms used should have the ordinary meaning understood by those skilled in the art to which this invention pertains.

[0049] Example 1

[0050] This embodiment provides a method for preparing glass fiber filter material, including the following steps:

[0051] 1) Take 20 kg of glass fiber with a diameter of 7 μm and 10 kg of glass fiber with a diameter of 3 μm, and put them together with 0.1 kg of sodium silicate dispersant into a mixing tank and stir and mix with water to prepare a glass fiber slurry with a density of 0.007 g / mL for later use.

[0052] 2) The weight is 25g / m 2 The nonwoven fabric is laid on the paper forming wire of the papermaking equipment. By controlling the speed of the nonwoven fabric feeding roller and the forming wire, the speed of the nonwoven fabric and the forming wire are the same, both at 10m / min.

[0053] 3) The glass fiber slurry in the mixing tank of step 1) is extracted into the headbox, the head concentration is adjusted to 0.002 g / mL and the machine speed is 10 m / min, and the glass fiber paper film is formed on the nonwoven fabric to obtain the nonwoven paper film.

[0054] 4) The nonwoven paper film obtained in step 3) is pressed with a 10N load by a pressing device to obtain a nonwoven glass fiber paper film.

[0055] 5) The nonwoven glass fiber paper film obtained in step 4) is initially dried at 100°C for 2 minutes using a drying device to obtain nonwoven glass fiber paper.

[0056] 6) Apply adhesive (specifically, a commercially available water-soluble resin adhesive) to the nonwoven fiberglass paper obtained in step 5) at a rate of 8 wt% of the paper's weight. Then, perform a secondary drying and curing process at 180°C for 30 minutes. Weigh the sample to obtain a basis weight of 45 g / m². 2 The fiberglass filter material, wherein the basis weight of the fiberglass paper membrane is 20g / m³. 2 .

[0057] Example 2

[0058] This embodiment provides a method for preparing glass fiber filter material, including the following steps:

[0059] 1) Take 10 kg of 5 μm glass fiber, 20 kg of 3 μm glass fiber and 0.1 kg of sodium silicate dispersant and put them into a mixing tank with water to mix and prepare a glass fiber slurry with a density of 0.007 g / mL for later use.

[0060] 2) The weight is 25g / m 2 The nonwoven fabric is laid on the paper forming wire of the papermaking equipment. By controlling the speed of the nonwoven fabric feeding roller and the forming wire, the speed of the nonwoven fabric and the forming wire are the same, both at 10m / min.

[0061] 3) The glass fiber slurry in the mixing tank of step 1) is extracted into the headbox, the head concentration is adjusted to 0.002 g / mL and the machine speed is 10 m / min, and the glass fiber paper film is formed on the nonwoven fabric to obtain the nonwoven paper film.

[0062] 4) The nonwoven paper film obtained in step 3) is pressed with a 15N load by a pressing device to obtain a nonwoven glass fiber paper film.

[0063] 5) The nonwoven glass fiber paper film obtained in step 4) is initially dried at 100°C for 2 minutes using a drying device to obtain nonwoven glass fiber paper.

[0064] 6) Apply sizing (specifically, a commercially available water-soluble resin adhesive) to the nonwoven fiberglass paper obtained in step 5) at a sizing rate of 8 wt% of the paper mass. Then, perform a secondary drying and curing process at 180°C for 30 minutes. Weigh the sample to obtain a basis weight of 42 g / m². 2 The fiberglass filter material, in which the fiberglass paper membrane has a basis weight of 17 g / m³. 2 .

[0065] Example 3

[0066] This embodiment provides a method for preparing glass fiber filter material, including the following steps:

[0067] 1) Take 10 kg of glass fiber with a diameter of 2 μm, 10 kg of glass fiber with a diameter of 1 μm, and 0.06 kg of sodium silicate dispersant and put them into a mixing tank for stirring and mixing to prepare a glass fiber slurry with a density of 0.007 g / mL for later use.

[0068] 2) The weight is 25g / m 2 The nonwoven fabric is laid on the paper forming wire of the papermaking equipment. By controlling the speed of the nonwoven fabric feeding roller and the forming wire, the speed of the nonwoven fabric and the forming wire are the same, both at 10m / min.

[0069] 3) The glass fiber slurry in the mixing tank of step 1) is extracted into the headbox, the head concentration is adjusted to 0.002 g / mL and the machine speed is 10 m / min, and the glass fiber paper film is formed on the nonwoven fabric to obtain the nonwoven paper film.

[0070] 4) The nonwoven paper film obtained in step 3) is pressed with a 20N load by a pressing device to obtain a nonwoven glass fiber paper film.

[0071] 5) The nonwoven glass fiber paper film obtained in step 4) is initially dried at 100°C for 2 minutes using a drying device to obtain nonwoven glass fiber paper.

[0072] 6) Apply sizing (specifically, a commercially available water-soluble resin adhesive) to the nonwoven fiberglass paper obtained in step 5) at an application rate of 8 wt% of the paper mass. Then, perform a secondary drying and curing process at 180°C for 30 minutes. Take a sample, weigh it, and obtain a basis weight of 40 g / m². 2 The fiberglass filter material, wherein the basis weight of the fiberglass paper membrane is 15g / m³. 2 .

[0073] Example 4

[0074] The difference between this embodiment and Embodiment 1 is that in step 3) of this embodiment, the concentration of the feedstock is adjusted to 0.001 g / mL and the feed speed is 5 m / min, resulting in a weight of 45 g / mL. 2 The fiberglass filter material, wherein the basis weight of the fiberglass paper membrane is 20g / m³. 2 .

[0075] Example 5

[0076] The difference between this embodiment and Embodiment 2 is that in step 1), 15 kg of glass fiber with a diameter of 5 μm and 15 kg of glass fiber with a diameter of 3 μm are placed together with 0.1 kg of sodium silicate dispersant in a mixing tank and mixed with water to prepare a glass fiber slurry with a density of 0.007 g / mL; in step 4), the nonwoven paper film is pressed under a 12 N load using a pressing device to obtain a basis weight of 45 g / m². 2 The fiberglass filter material, wherein the basis weight of the fiberglass paper membrane is 20g / m³. 2 .

[0077] Example 6

[0078] The difference between this embodiment and Embodiment 1 is that in step 6) of this embodiment, the dried paper film is sizing at an application rate of 6 wt% of the paper mass (specifically, a commercially available resin adhesive) to obtain a basis weight of 45 g / m³. 2 The fiberglass filter material, wherein the basis weight of the fiberglass paper membrane is 20g / m³. 2 .

[0079] Example 7

[0080] The difference between this embodiment and Embodiment 3 is that in step 1) of this embodiment, 20 kg of 1 μm glass fiber and 0.06 kg of sodium silicate dispersant are placed together in a mixing tank and stirred to prepare a glass fiber slurry with a basis weight of 0.007 g / mL, resulting in a basis weight of 37 g / mL. 2 The fiberglass filter material, wherein the basis weight of the fiberglass paper membrane is 12g / m³. 2 .

[0081] Example 8

[0082] The difference between this embodiment and embodiment 7 is that in step 3) of this embodiment, the vehicle speed is increased to 13 m / min, resulting in a weight of 35 g / m. 2 The fiberglass filter material, wherein the basis weight of the fiberglass paper membrane is 10g / m³. 2 .

[0083] Example 9

[0084] The difference between this embodiment and embodiment 1 is that the basis weight of the nonwoven fabric in step 2) of this embodiment is 30 g / m². 2 The yield was 50 g / m³. 2 The fiberglass filter material, wherein the basis weight of the fiberglass paper membrane is 20g / m³. 2 .

[0085] Comparative Example 1

[0086] 1) Take 20 kg of glass fiber with a diameter of 7 μm, 10 kg of glass fiber with a diameter of 3 μm, and 0.1 kg of sodium silicate dispersant and put them into a mixing tank with water to mix and prepare a glass fiber slurry with a density of 0.007 g / mL for later use.

[0087] 2) The glass fiber slurry in the mixing tank in step 1) is extracted into the headbox, the head concentration is adjusted to 0.002 g / mL and the machine speed is 10 m / min, and the glass fiber paper film is formed on the forming wire of the papermaking equipment to obtain the non-woven paper film.

[0088] In this comparative example, no nonwoven fabric was added. It can be clearly seen that the glass fiber paper has very low strength after leaving the forming wire and cannot be transferred to the pressing device and the downstream drying device, resulting in the failure of glass fiber filter material preparation.

[0089] Comparative Example 2

[0090] 1) Take 10 kg of glass fiber with a diameter of 2 μm, 10 kg of glass fiber with a diameter of 1 μm, and 0.06 kg of sodium silicate dispersant and put them into a mixing tank for stirring and mixing to prepare a glass fiber slurry with a concentration of 0.007 g / mL for later use.

[0091] 2) The weight is 45g / m 2 The nonwoven fabric is laid on the paper forming wire of the papermaking equipment. By controlling the speed of the nonwoven fabric feeding roller and the forming wire, the speed of the nonwoven fabric and the forming wire are the same, both at 10m / min.

[0092] 3) Pump the glass fiber slurry from the mixing tank in step 1) into the headbox, adjust the head concentration to 0.002 g / mL and the machine speed to 10 m / min, and form a glass fiber paper film on the nonwoven fabric to obtain a nonwoven paper film.

[0093] During the operation of this comparative example, it was found that due to the excessive thickness and poor air permeability of the nonwoven fabric, the glass fibers agglomerated and were unevenly distributed on the nonwoven fabric. A large number of glass fiber clumps appeared on the glass fiber paper, resulting in the failure of the preparation of glass fiber filter material.

[0094] The fiberglass filter materials obtained in Examples 1-9 were subjected to thickness, tensile strength, burst strength, and temperature resistance tests, and the test results are shown in Table 1. The thickness and basis weight were tested according to GB / T451; the tensile strength was tested according to GB / T453; the burst strength was tested according to GB / T454; and the temperature resistance test procedure was as follows: the fiberglass filter material sample was placed in a heating chamber at 180°C and kept at that temperature for 1 hour, then observed for any ablation.

[0095] Table 1. Summary of the performance of the glass fiber filter media obtained in Examples 1-9

[0096] Example Thickness (mm) <![CDATA[Grammage (g / m 2 )]]> Tensile strength (N) Bursting strength (kPa) Temperature resistance (°C) Example 1 0.20mm 45 28N 270kPa ≥180℃ Example 2 0.17mm 42 27N 302kPa ≥180℃ Example 3 0.15mm 40 27N 272kPa ≥180℃ Example 4 0.21mm 45 29N 269kPa ≥180℃ Example 5 0.18mm 45 26N 262kPa ≥180℃ Example 6 0.21mm 45 24N 258kPa ≥180℃ Example 7 0.12mm 37 29N 278kPa ≥180℃ Example 8 0.10mm 35 26N 267kPa ≥180℃ Example 9 0.23mm 50 32N 313kPa ≥180℃

[0097] As can be seen from the data in Table 1, the thickness of the materials described in Examples 1-9 of this invention is 0.10 mm to 0.23 mm, and the basis weight is 35 g / m³. 2 ~50g / m 2 It has a tensile strength of 24N to 32N, a bursting strength of 258MPa to 313kPa, and a temperature resistance of ≥180℃.

[0098] Comparing Examples 1, 2, and 3, it can be seen that with the same nonwoven fabric and the same amount of sizing, as the basis weight of the glass fiber filter material gradually decreases and the average filament diameter of the mixed fibers decreases, the thickness tends to decrease. However, the tensile strength and bursting strength do not show a decreasing trend. As the filament diameter of the glass fibers decreases, the glass fibers are more tightly packed during the paper-forming process, resulting in a smaller thickness. The overall basis weight of the glass fibers decreases, and the volume decreases, so the thickness tends to decrease. However, the finer the glass fibers, the more complex the winding, and the tighter the packing, the more it promotes the improvement of the tensile strength and bursting strength of the glass fiber filter material.

[0099] Comparing Examples 1 and 4, it can be seen that with the same glass fiber ratio, the machine speed needs to be reduced to produce paper of the same basis weight when the fiber slurry concentration is reduced. Under the same glass fiber ratio, same basis weight, and same sizing amount, the performance of glass fiber filter materials is similar.

[0100] Comparing Examples 2 and 5, it can be seen that under the same fiber slurry concentration, filter media with the same basis weight can be prepared by increasing the ratio of coarse fibers to fine fibers. Since the proportion of coarse fibers increases, the thickness of the filter media increases slightly, and the proportion of fine fibers decreases, so the strength of the glass fiber filter media decreases.

[0101] Comparing Examples 1 and 6, it can be seen that, with the fiber ratio and nonwoven fabric processes remaining unchanged, reducing the amount of adhesive increases the thickness, while decreasing the tensile strength and bursting strength. Reduced adhesive content results in a looser fiber structure, decreasing the bond strength between fibers and thus reducing the strength of the fiberglass filter material.

[0102] Comparing Examples 3 and 7, it can be seen that adjusting the two fiber sizes to a single fiber size and reducing the fiber diameter results in a decrease in the basis weight and thickness of the glass fiber filter material. However, its strength does not decrease; in fact, it increases. This indicates that a single fiber size and a finer fiber diameter lead to more complex intertwining, and a slight decrease in basis weight does not lead to a decrease in strength. This further demonstrates that reducing the fiber diameter is an important factor in enhancing the strength of the filter material.

[0103] Comparing Examples 7 and 8, it can be seen that under the same process conditions, reducing only the basis weight of glass fiber will result in a decrease in the thickness and strength of the glass fiber filter material.

[0104] Comparing Examples 1 and 9, it can be seen that increasing the basis weight of the nonwoven fabric can also improve the strength and thickness of the glass fiber filter material. This indicates that changes in the nonwoven fabric are an important factor affecting the strength of the glass fiber filter material.

[0105] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0106] The numerical range described in this invention includes all values ​​within this range, and also includes any range value composed of any two values ​​within this range. Different values ​​of the same indicator appearing in all embodiments of this invention can be arbitrarily combined to form a range value.

[0107] The technical features in the claims and / or specification of this invention can be combined, and the combination is not limited to the combinations obtained through reference in the claims. Technical solutions obtained by combining the technical features in the claims and / or specification are also within the scope of protection of this invention.

[0108] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A method for preparing a glass fiber filter material, characterized in that, Includes the following steps: 1) Glass fiber, dispersant and water are stirred and mixed to obtain glass fiber slurry; the mass ratio of glass fiber to dispersant is 100:1 to 2000:1; the diameter of glass fiber is 0.1μm to 10μm; 2) Lay PET nonwoven fabric on a paper forming mesh; the basis weight of the PET nonwoven fabric is 10 g / m². 2 ~25g / m 2 ; 3) Apply the glass fiber slurry obtained in step 1) onto the PET nonwoven fabric to form a glass fiber paper film, thereby obtaining a nonwoven paper film; the concentration of the glass fiber slurry is 0.0001 g / ml to 0.008 g / ml; 4) Press the nonwoven paper film obtained in step 3) to obtain a nonwoven glass fiber paper film; the pressing load is 5N to 20N; 5) The nonwoven glass fiber paper film obtained in step 4) is initially dried to obtain nonwoven glass fiber paper. The initial drying temperature is 80~150℃; 6) Apply sizing to the non-woven fiberglass paper obtained in step 5), and then perform a second drying and curing process to obtain fiberglass filter material; The glass fiber filter material has a thickness of less than 0.5 mm and a basis weight of less than 60 g / m³. 2 Tensile strength is higher than 24N, bursting strength is higher than 210MPa, and temperature resistance is greater than or equal to 180℃; The fiberglass filter material is manufactured using a fiberglass filter material / nonwoven fabric integrated molding device. The integrated molding device includes a feeding unit and a molding unit, with the molding unit placed on one side of the feeding unit. The feeding unit includes a support frame, on which a nonwoven fabric feeding roller and a nonwoven fabric spreading roller are fixedly supported. The molding unit includes a headbox and a molding net that supports the nonwoven fabric and moves together with it. The headbox is positioned above the molding net.

2. The method for preparing glass fiber filter material as described in claim 1, characterized in that, In step 3), the rotation speed of the forming mesh is 4m / min to 40m / min.

3. In the method for preparing the glass fiber filter material as described in claim 1, the characteristic is that, In step 6), the amount of adhesive applied is 5-10 wt% based on the mass of the nonwoven fiberglass paper; the temperature for the secondary drying and curing is 120-210℃.

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