Special glass fiber air filter material for military civil air defense and preparation method of special glass fiber air filter material

Abstract

The invention belongs to the technical field of papermaking, and particularly relates to a military-grade glass fiber air filter material special for civil air defense and a preparation method thereof. The glass wool is prepared from the following raw materials in parts by mass: 12-18 parts of glass wool of which the diameter is 0.1-0.3 mu m and the beating degree is 54 degrees SR; 35 to 45 parts of glass wool with the diameter of 0.4 to 0.6 mu m and the beating degree of 44 degree SR; 28-34 parts of glass wool with a diameter of 0.9-1.2 [mu] m and a beating degree of 19 DEG SR; 5 to 20 parts of chopped glass fiber filaments; the glass fiber air filter material further comprises a surface sizing glue solution applied to the glass fiber air filter material, and the surface sizing glue solution is a mixture of acrylic resin, a fluoride-free waterproof agent and silicon-based modified acrylate. Through reasonable matching of the raw materials, the filter material is not easy to tear or deform when bearing wind pressure fluctuation, so that the yield of products and the structural integrity of long-term use are ensured, and the service cycle is prolonged.

Description

Technical Field

[0001] This invention belongs to the field of papermaking technology, specifically relating to military-grade civil defense-specific fiberglass air filter material and its preparation method. Background Technology

[0002] As the core functional material of filters, the performance of filter paper directly determines the efficiency and stability of the entire filtration system. Especially in the field of air filtration, and particularly in applications with extremely high safety and reliability requirements such as civil defense projects, air filter paper not only needs to perform excellently under normal conditions but also needs to maintain stable performance under extreme or special environments. Traditional processes using wood pulp fibers or blends of wood pulp and polyester fibers, while used in basic filtration, suffer from a loose structure and uneven fiber distribution, resulting in a lower upper limit for filtration accuracy, typically only reaching F7 level, which is insufficient to meet the demand for efficient interception of ultrafine particles. Furthermore, they exhibit high airflow resistance and poor moisture resistance. Civil defense projects, in particular, have extremely high requirements for filters, demanding both high precision and low resistance. Additionally, in rainy weather with high humidity, ordinary filter paper easily absorbs moisture and deforms, increasing resistance, further necessitating extremely high moisture resistance from the filter paper itself.

[0003] Patent CN117385675A discloses a "high-efficiency, low-resistance, and highly waterproof glass fiber air filter material and its preparation method." This technology represents a significant improvement over traditional wood pulp filter paper and early glass fiber filter materials. This existing technology primarily involves compounding glass wool with three different beating degrees (52-60°SR, 45-51°SR, and 17-21°SR) with specific chopped glass fibers (5μm and 9μm in diameter), and applying a mixture of acrylic resin and a fluorinated waterproofing agent to the surface. The aim is to simultaneously improve the filtration efficiency of the filter material, reduce resistance, and impart waterproof properties. Its preparation method encompasses key processes such as acid pulping, inclined wire papermaking, transfer wire sizing, and three-stage drying. This patent uses 9μm short-cut glass fiber filaments, which are relatively thick and hard. During the folding process, the paper surface is prone to unevenness and fiber burrs, affecting the overall appearance. Civil defense projects are mostly underground enclosed spaces with relatively limited ventilation. The VOCs and harmful volatile substances in fluorinated waterproofing agents can harm the human body and are difficult to disperse quickly, remaining for a long time and affecting the human body.

[0004] Therefore, it is necessary to develop a military-grade fiberglass air filter material with high efficiency, low resistance, good waterproof performance, and high tensile strength to meet the requirements. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a military-grade fiberglass air filter material for civil defense. The resulting air filter material not only ensures high filtration accuracy and low air resistance, but also has excellent waterproof effect, high tensile strength, is easy to process, adapts to high humidity environments, extends the service life of the filter, and meets the air purification needs of civil defense projects.

[0006] The present invention also provides a preparation method that is simple, easy to implement, and suitable for large-scale production.

[0007] The military-grade civil defense-specific fiberglass air filter material of this invention is made from the following raw materials in parts by weight: Glass wool with a diameter of 0.1-0.3μm and a knockout degree of 54°SR: 12-18 parts; Glass wool with a diameter of 0.4-0.6 μm and a knockout degree of 44°SR: 35-45 parts; Glass wool with a diameter of 0.9-1.2μm and a knockout degree of 19°SR: 28-34 parts; Short-cut glass fiber filaments: 5-20 parts; It also includes a surface sizing agent applied to the aforementioned glass fiber air filter material, wherein the surface sizing agent is a mixture of acrylic resin, fluorine-free waterproofing agent, and silicone-modified acrylate.

[0008] The surface sizing adhesive is a mixture of acrylic resin, fluorine-free waterproofing agent, and silicone-modified acrylate in a mass ratio of (3-5):(1-2):(0.2-0.6).

[0009] The application rate of the surface sizing solution is 4-8%. The application rate is the percentage of the total mass of the paper sheet (4-8% sizing and 92-96% fiber per 100g of paper).

[0010] The chopped glass fiber filaments have a chopped length of 6 mm and a diameter of 5 μm.

[0011] The preparation method of the military-grade civil defense-specific fiberglass air filter material of the present invention comprises the following steps: A. Pulping: Add water to a hydrapulper, adjust the pH value to 2.5±0.25 with sulfuric acid, add glass wool with diameters of 0.1-0.3μm, 0.4-0.6μm, and 0.9-1.2μm and pulverize for 2-5 minutes; then add chopped glass fibers and pulverize for 1-5 minutes, controlling the mass concentration at 1-3% to obtain the pulverized pulp. B. Slurry preparation: After crushing, the slurry is uniformly processed through a high-frequency disintegrator without cutting, and then enters the slurry preparation tank to obtain a mixed slurry suspension; C. Flow forming: After diluting the mixed slurry suspension, it is pumped to the inclined wire paper machine for dewatering and forming. The paper is dewatered and formed on the forming wire. Excess wet waste will fall into the wet waste pool. Then the paper passes through the transfer wire and the sizing machine. The surface sizing solution is applied to the transfer wire by spraying. The sizing pH value is controlled between 8 and 11. The lower end of the transfer wire is equipped with a vacuum box. The vacuum box is used to suck the excess sizing solution to the sizing solution recycling system. The vacuum pressure is controlled between -40 and -80 kPa. D. Drying and winding: The wet paper sheets coated with glue are dried in a drying cylinder to obtain the final paper; Dry waste paper generated during the drying and winding stage is fed back into the pulper for further processing to obtain shredded dry waste paper. The shredded dry waste paper and excess wet waste paper are then reused through a wet waste and dry waste paper recycling system.

[0012] The adhesive recycling system includes a vacuum chamber connected to a vacuum tank. The bottom of the vacuum tank is connected to a vibrating screen via a first transfer pump, which in turn connects to a transition tank. The transition tank is connected to a return adhesive tank, which is connected to a glue applicator via a second transfer pump. Excess adhesive from the transfer net is drawn into the vacuum tank through the vacuum chamber. The gaseous adhesive liquefies and settles at the bottom of the vacuum tank. The adhesive at the bottom of the vacuum tank flows through a steel wire hose, the first transfer pump, and the vibrating screen to the transition tank, and then to the return adhesive tank. Fresh adhesive and return adhesive mix on the pipeline between the return adhesive tank and the second transfer pump, and are then pumped to the glue applicator for use.

[0013] The wet and dry waste paper recycling system includes a wet waste tank, which is connected to a wet waste preparation tank via a third transfer pump. A dry waste pulp tank is also connected to the wet waste preparation tank. The bottom of the wet waste preparation tank is connected to a wet waste concentration tank. Excess wet waste falls into the wet waste tank, where water is added to adjust the concentration. The wet waste is then pumped into the wet waste preparation tank via the third transfer pump. The shredded dry waste paper is pumped from the dry waste pulp tank into the wet waste preparation tank. After being mixed evenly, the paper is pumped into the wet waste concentration tank to adjust the concentration to 1-1.5%. The shredded paper is then mixed with the shredded pulp obtained in step A at a mass ratio of (0.05-0.1):1.

[0014] The mass concentration of the slurry after disintegration in step A is 1-3%, the mass concentration of the mixed slurry suspension in step B is 1-1.5%, and the mass concentration of the diluted mixed slurry suspension in step C is 0.4-1.0‰.

[0015] Step D, the drying process in the drying cylinder, is specifically divided into three sections: high-temperature section a (130-140℃), high-temperature section b (140-150℃), and high-temperature section c (155-165℃). Compared to steam pressure, temperature monitoring is more effective, as the curing state of the adhesive can be controlled by adjusting the cylinder temperature.

[0016] The basis weight of the paper produced in step D is 72-76 g / m³. 2The production speed is controlled at 85-95m / min.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) This invention uses a blend of three different diameter glass wool fibers. 0.9-1.2 μm fibers form the skeleton of the filter material, ensuring structural bulkiness and large channels, effectively reducing airflow resistance; 0.4-0.6 μm fibers fill the gaps in the skeleton, responsible for capturing medium-sized particles; while 0.1-0.3 μm fibers are densely distributed in the fiber network, specifically for intercepting the most difficult-to-capture submicron-sized ultrafine particles. This "coarse-medium-fine" gradient design forms a three-dimensional filtration network from the surface inwards, from sparse to dense, achieving graded capture of particles of different sizes. This ensures improved filtration efficiency while minimizing initial resistance. The addition of 6 mm long, 5 μm diameter chopped glass fibers effectively overlaps and reinforces the disordered glass wool network, greatly improving the transverse and longitudinal tensile strength of the filter paper. This makes the filter material less prone to tearing or deformation when subjected to wind pressure fluctuations, ensuring product yield and structural integrity for long-term use, and extending the service life.

[0018] (2) Glass fiber itself is an inorganic material and does not absorb moisture, providing an inherent basis for moisture protection. This invention also uses a surface sizing agent formulated with acrylic resin, fluorine-free waterproofing agent, and silicone-modified acrylate in a specific ratio. Among them, fluorosilane can provide extremely low surface tension, giving the filter material excellent hydrophobicity; acrylic resin, as a film-forming agent, firmly fixes the waterproofing agent to the fiber surface; silicone-modified acrylate can enhance the compatibility and bonding strength between the sizing agent and glass fiber, forming a complete and firm hydrophobic protective film on the fiber surface. Even under high ambient humidity, moisture cannot wet the fiber, the filter paper structure does not expand or deform, and the resistance remains stable, solving the problem of "deliquescence failure" of traditional filter paper.

[0019] (3) The present invention adopts a gradient heating and drying process, which avoids the damage to the filter paper structure, bubbling or uneven shrinkage caused by rapid evaporation of moisture. This gentle heating process allows the moisture to be removed smoothly, the adhesive to be fully cured, and finally endows the paper with stable physical properties and consistent basis weight.

[0020] (4) The glue recycling system and wet and dry paper recycling system of the present invention constitute a closed-loop production, which recycles nearly 100% of the excess glue and waste paper generated in the production process. This not only significantly reduces the consumption of raw materials and production costs, but also conforms to the environmental protection concept of green manufacturing. At the same time, it ensures the stability of pulp concentration and indirectly improves the consistency of product quality. Attached Figure Description

[0021] Figure 1This is a schematic diagram of the adhesive recycling system; Figure 2 A schematic diagram of a wet and dry paper recycling system; In the diagram: 1. Vacuum box; 2. Vacuum tank; 3. First transfer pump; 4. Vibrating screen; 5. Transition tank; 6. Return glue tank; 7. Second transfer pump; 8. Wet loss tank; 9. Third transfer pump; 10. Wet loss preparation tank; 11. Dry loss slurry tank; 12. Wet loss thickening tank. Detailed Implementation

[0022] The present invention will be further described below with reference to the embodiments.

[0023] Unless otherwise specified, all raw materials used in the examples were commercially available.

[0024] The acrylic emulsion is brand name KH-6266, manufactured by Shandong Kunhan New Material Technology Co., Ltd. The fluorine-free waterproofing agent is brand XF-5007, manufactured by Daikin Fluorochemicals (China) Co., Ltd. The silane-modified waterborne acrylic resin is brand name KRN212, manufactured by Heshan Jinrunna New Material Co., Ltd. TSY-54 glass wool with a diameter of 0.1-0.3μm and a knockout degree of 54°SR was purchased from Yulin Tianshengyuan Glass Fiber Technology Co., Ltd. TSY-44 glass wool with a diameter of 0.4-0.6μm and a knockout degree of 44°SR was purchased from Yulin Tianshengyuan Glass Fiber Technology Co., Ltd. TSY-19 glass wool with a diameter of 0.9-1.2μm and a knockout degree of 19°SR was purchased from Yulin Tianshengyuan Glass Fiber Technology Co., Ltd. The chopped glass fiber filaments, T437F, were purchased from Taishan Glass Fiber Co., Ltd.

[0025] Example 1 The preparation method of the military-grade civil defense-specific fiberglass air filter material is as follows: Materials preparation: By weight, prepare 12 parts of glass wool with a diameter of 0.1-0.3μm and a beating degree of 54°SR, 45 parts of glass wool with a diameter of 0.4-0.6μm and a beating degree of 44°SR, 34 parts of glass wool with a diameter of 0.9-1.2μm and a beating degree of 19°SR, and 9 parts of short glass fiber filaments with a chopped length of 6mm and a diameter of 5μm. A. Pulping: Water is added to a hydrapulper, and the pH value is adjusted to 2.55 with sulfuric acid. Glass wool with a diameter of 0.1-0.3μm and a beating degree of 54°SR, glass wool with a diameter of 0.4-0.6μm and a beating degree of 44°SR, and glass wool with a diameter of 0.9-1.2μm and a beating degree of 19°SR are added and pulverized for 3 minutes. Then, chopped glass fibers with a length of 6mm and a diameter of 5μm are added and pulverized for 2 minutes. Finally, the mass concentration of fibers in water is controlled at 1.5%, and the pulverized pulp is obtained. B. Slurry preparation: After dispersion, the mixture is uniformly passed through a high-frequency disintegrator without cutting, and then enters the slurry preparation tank. The slurry concentration is controlled at 1% to obtain a mixed slurry suspension. C. Flow forming: The mixed pulp suspension is pumped to the inclined wire paper machine at a concentration of 0.4‰ for dewatering and forming on the forming wire. Excess wet loss falls into the wet loss tank 8. Then, the paper passes through the transfer wire and the sizing machine. The surface sizing solution is applied to the transfer wire by spraying, and the sizing pH value is controlled at 11. The vacuum pressure of the vacuum box 1 at the lower end of the transfer wire is controlled at -80kPa. The vacuum box 1 is used to suck the excess sizing solution to the sizing solution recycling system. The surface sizing solution is composed of acrylic resin, fluorine-free waterproofing agent and silicone-modified acrylate. The mass ratio of acrylic resin: fluorine-free waterproofing agent: silicone-modified acrylate is 5:2:0.2, and the overall coating amount is controlled at 8%. D. Drying and winding: The wet paper sheet coated with glue is dried in a drying cylinder to obtain the final paper. The drying process is divided into three stages: high-temperature stage A at 130℃, high-temperature stage B at 140℃, and high-temperature stage C at 155℃. The paper basis weight is 76 g / m³. 2 The paper is produced at a speed controlled at 85m / min.

[0026] Dry waste paper generated during the drying and winding stage is fed back into the pulper for further processing to obtain shredded dry waste paper. The shredded dry waste paper and excess wet waste paper are then reused through a wet waste and dry waste paper recycling system.

[0027] like Figure 1 As shown, the adhesive recycling system includes a vacuum chamber 1, which is connected to a vacuum tank 2. The bottom of the vacuum tank 2 is connected to a vibrating screen 4 via a first transfer pump 3, which is connected to a transition tank 5 via the vibrating screen 4. The transition tank 5 is connected to a return adhesive tank 6, which is connected to a glue applicator via a second transfer pump 7. Excess adhesive from the transfer net is drawn into the vacuum tank 2 through the vacuum chamber 1. The gaseous adhesive liquefies and settles at the bottom of the vacuum tank 2. The adhesive at the bottom of the vacuum tank 2 flows through a steel wire hose, the first transfer pump 3, and the vibrating screen 4 to the transition tank 5. Fresh adhesive and return adhesive are mixed in the pipeline between the return adhesive tank 6 and the second transfer pump 7 (fresh adhesive: return adhesive mass ratio is 1.5:1), and then sent to the glue applicator for use via the second transfer pump 7.

[0028] like Figure 2 As shown, the wet and dry waste paper recycling system includes a wet waste tank 8, which is connected to a wet waste preparation tank 10 via a third transfer pump 9. A dry waste pulp tank 11 is connected to the wet waste preparation tank 10, and a wet waste concentration tank 12 is connected to the bottom of the wet waste preparation tank 10. Excess wet waste falls into the wet waste tank 8, and water is added to adjust the concentration to 1%. Then, it is pumped into the wet waste preparation tank 10 via the third transfer pump 9. The shredded dry waste paper is pumped from the dry waste pulp tank 11 into the wet waste preparation tank 10. After being mixed evenly at a mass ratio of 5% dry waste and 95% wet waste, it is pumped into the wet waste concentration tank 12 to adjust the concentration to 1%. Then, it is mixed with the shredded pulp obtained in step A at a mass ratio of 0.05:1 for use.

[0029] Example 2 The preparation method of the military-grade civil defense-specific fiberglass air filter material is as follows: Materials preparation: By weight, prepare 18 parts of glass wool with a diameter of 0.1-0.3μm and a beating degree of 54°SR, 35 parts of glass wool with a diameter of 0.4-0.6μm and a beating degree of 44°SR, 28 parts of glass wool with a diameter of 0.9-1.2μm and a beating degree of 19°SR, and 19 parts of short glass fiber filaments with a chopped length of 6mm and a diameter of 5μm. A. Pulping: Water is added to a hydrapulper, and the pH value is adjusted to 2.6 with sulfuric acid. Glass wool with a diameter of 0.1-0.3μm and a beating degree of 54°SR, glass wool with a diameter of 0.4-0.6μm and a beating degree of 44°SR, and glass wool with a diameter of 0.9-1.2μm and a beating degree of 19°SR are added and pulverized for 4 minutes. Then, short glass fibers with a length of 6mm and a diameter of 5μm are added and pulverized for 3 minutes. Finally, the mass concentration of fibers in water is controlled at 3%, and the pulp is obtained. B. Slurry preparation: After dispersion, the mixture is uniformly passed through a high-frequency disintegrator without cutting, and then enters the slurry preparation tank. The slurry concentration is controlled at 1.5% to obtain a mixed slurry suspension. C. Forming and Dewatering: The mixed slurry suspension is pumped to an inclined wire paper machine at a concentration of 0.4‰ for dewatering and forming on the forming wire. Excess wet loss falls into the wet loss tank 8, and then passes through a transfer wire and a sizing machine. The surface sizing agent is applied to the transfer wire by spraying, with the sizing pH value controlled at 8. The vacuum pressure of the vacuum box 1 at the lower end of the transfer wire is controlled at -70 kPa. The vacuum box 1 is used to suck the excess sizing agent to the sizing agent recycling system. The surface sizing agent is composed of acrylic resin, fluorine-free waterproofing agent, and silicone-modified acrylate. The mass ratio of acrylic resin: fluorine-free waterproofing agent: silicone-modified acrylate is 5:2:0.6, and the overall coating amount is controlled at 8%. D. Drying and winding: The wet paper sheets coated with adhesive are dried in a drying cylinder to obtain the final paper. The drying process is divided into three stages: high-temperature stage A at 140℃, high-temperature stage B at 150℃, and high-temperature stage C at 165℃. The paper basis weight is 72 g / m³. 2 The paper is produced at a speed controlled at 85m / min.

[0030] Dry waste paper generated during the drying and winding stage is fed back into the pulper for further processing to obtain shredded dry waste paper. The shredded dry waste paper and excess wet waste paper are then reused through a wet waste and dry waste paper recycling system.

[0031] like Figure 1 As shown, the adhesive recycling system includes a vacuum chamber 1, which is connected to a vacuum tank 2. The bottom of the vacuum tank 2 is connected to a vibrating screen 4 via a first transfer pump 3, which is connected to a transition tank 5 via the vibrating screen 4. The transition tank 5 is connected to a return adhesive tank 6, which is connected to a glue applicator via a second transfer pump 7. Excess adhesive from the transfer net is drawn into the vacuum tank 2 through the vacuum chamber 1. The gaseous adhesive liquefies and settles at the bottom of the vacuum tank 2. The adhesive at the bottom of the vacuum tank 2 flows through a steel wire hose, the first transfer pump 3, and the vibrating screen 4 to the transition tank 5. Fresh adhesive and return adhesive are mixed in the pipeline between the return adhesive tank 6 and the second transfer pump 7 (fresh adhesive: return adhesive mass ratio is 1.5:1), and then sent to the glue applicator for use via the second transfer pump 7.

[0032] like Figure 2 As shown, the wet and dry waste paper recycling system includes a wet waste tank 8, which is connected to a wet waste preparation tank 10 via a third transfer pump 9. A dry waste pulp tank 11 is also connected to the wet waste preparation tank 10. The bottom of the wet waste preparation tank 10 is connected to a wet waste concentration tank 12. Excess wet waste falls into the wet waste tank 8, where water is added to adjust the concentration to 1.5%. The wet waste is then pumped into the wet waste preparation tank 10 via the third transfer pump 9. The shredded dry waste paper is pumped from the dry waste pulp tank 11 into the wet waste preparation tank 10. After being mixed evenly at a mass ratio of 5% dry waste and 95% wet waste, the mixture is pumped into the wet waste concentration tank 12 to adjust the concentration to 1.5%. Finally, it is mixed with the shredded pulp obtained in step A at a mass ratio of 0.1:1 for use.

[0033] Example 3 The preparation method of the military-grade civil defense-specific fiberglass air filter material is as follows: Materials preparation: By weight, prepare 16 parts of glass wool with a diameter of 0.1-0.3μm and a beating degree of 54°SR, 45 parts of glass wool with a diameter of 0.4-0.6μm and a beating degree of 44°SR, 34 parts of glass wool with a diameter of 0.9-1.2μm and a beating degree of 19°SR, and 5 parts of short glass fiber filaments with a chopped length of 6mm and a diameter of 5μm. A. Pulping: Water is added to a hydrapulper, and the pH value is adjusted to 2.5 with sulfuric acid. Glass wool with a diameter of 0.1-0.3μm and a beating degree of 54°SR, glass wool with a diameter of 0.4-0.6μm and a beating degree of 44°SR, and glass wool with a diameter of 0.9-1.2μm and a beating degree of 19°SR are added and pulverized for 4 minutes. Then, short glass fibers with a length of 6mm and a diameter of 5μm are added and pulverized for 3 minutes. Finally, the mass concentration of fibers in water is controlled at 1%, and the pulp is obtained. B. Slurry preparation: After dispersion, the mixture is uniformly passed through a high-frequency disintegrator without cutting, and then enters the slurry preparation tank. The slurry concentration is controlled at 1% to obtain a mixed slurry suspension. C. Forming and Dewatering: The mixed slurry suspension is pumped to an inclined wire paper machine at a concentration of 0.4‰ for dewatering and forming on the forming wire. Excess wet loss falls into the wet loss tank 8, and then passes through a transfer wire and a sizing machine. The surface sizing agent is applied to the transfer wire by spraying, with the sizing pH value controlled at 11. The vacuum pressure of the vacuum box 1 at the lower end of the transfer wire is controlled at -80 kPa. The vacuum box 1 is used to suck the excess sizing agent to the sizing agent recycling system. The surface sizing agent is composed of acrylic resin, fluorine-free waterproofing agent, and silicone-modified acrylate. The mass ratio of acrylic resin: fluorine-free waterproofing agent: silicone-modified acrylate is 5:2:0.6, and the overall coating amount is controlled at 4%. D. Drying and winding: The wet paper sheets coated with adhesive are dried in a drying cylinder to obtain the final paper. The drying process is divided into three stages: high-temperature stage A at 135℃, high-temperature stage B at 145℃, and high-temperature stage C at 160℃. The paper basis weight is 76 g / m³. 2 The paper is produced at a speed controlled at 95m / min.

[0034] Dry waste paper generated during the drying and winding stage is fed back into the pulper for further processing to obtain shredded dry waste paper. The shredded dry waste paper and excess wet waste paper are then reused through a wet waste and dry waste paper recycling system.

[0035] like Figure 1 As shown, the adhesive recycling system includes a vacuum chamber 1, which is connected to a vacuum tank 2. The bottom of the vacuum tank 2 is connected to a vibrating screen 4 via a first transfer pump 3, which is connected to a transition tank 5 via the vibrating screen 4. The transition tank 5 is connected to a return adhesive tank 6, which is connected to a glue applicator via a second transfer pump 7. Excess adhesive from the transfer net is drawn into the vacuum tank 2 through the vacuum chamber 1. The gaseous adhesive liquefies and settles at the bottom of the vacuum tank 2. The adhesive at the bottom of the vacuum tank 2 flows through a steel wire hose, the first transfer pump 3, and the vibrating screen 4 to the transition tank 5. Fresh adhesive and return adhesive are mixed in the pipeline between the return adhesive tank 6 and the second transfer pump 7 (fresh adhesive: return adhesive mass ratio is 1.5:1), and then sent to the glue applicator for use via the second transfer pump 7.

[0036] like Figure 2 As shown, the wet and dry waste paper recycling system includes a wet waste tank 8, which is connected to a wet waste preparation tank 10 via a third transfer pump 9. A dry waste pulp tank 11 is connected to the wet waste preparation tank 10, and a wet waste concentration tank 12 is connected to the bottom of the wet waste preparation tank 10. Excess wet waste falls into the wet waste tank 8, and water is added to adjust the concentration to 1%. Then, it is pumped into the wet waste preparation tank 10 via the third transfer pump 9. The shredded dry waste paper is pumped from the dry waste pulp tank 11 into the wet waste preparation tank 10. After being mixed evenly at a mass ratio of 5% dry waste and 95% wet waste, it is pumped into the wet waste concentration tank 12 to adjust the concentration to 1%. Then, it is mixed with the shredded pulp obtained in step A at a mass ratio of 0.05:1 for use.

[0037] Example 4 The preparation method of the military-grade civil defense-specific fiberglass air filter material is as follows: Materials preparation: By weight, prepare 17 parts of glass wool with a diameter of 0.1-0.3μm and a beating degree of 54°SR, 35 parts of glass wool with a diameter of 0.4-0.6μm and a beating degree of 44°SR, 28 parts of glass wool with a diameter of 0.9-1.2μm and a beating degree of 19°SR, and 20 parts of short glass fiber filaments with a chopped length of 6mm and a diameter of 5μm. A. Pulping: Water is added to a hydrapulper, and the pH value is adjusted to 2.5 with sulfuric acid. Glass wool with a diameter of 0.1-0.3μm and a beating degree of 54°SR, glass wool with a diameter of 0.4-0.6μm and a beating degree of 44°SR, and glass wool with a diameter of 0.9-1.2μm and a beating degree of 19°SR are added and pulverized for 4 minutes. Then, chopped glass fibers with a length of 6mm and a diameter of 5μm are added and pulverized for 3 minutes. Finally, the mass concentration of fibers in water is controlled at 1.5%, and the pulverized pulp is obtained. B. Slurry preparation: After dispersion, the mixture is uniformly passed through a high-frequency disintegrator without cutting, and then enters the slurry preparation tank. The slurry concentration is controlled at 1% to obtain a mixed slurry suspension. C. Forming and Dewatering: The mixed slurry suspension is pumped to an inclined wire paper machine at a concentration of 0.4‰ for dewatering and forming on the forming wire. Excess wet loss falls into the wet loss tank 8, and then passes through a transfer wire and a sizing machine. The surface sizing agent is applied to the transfer wire by spraying, with the sizing pH value controlled at 11. The vacuum pressure of the vacuum box 1 at the lower end of the transfer wire is controlled at -80 kPa. The vacuum box 1 is used to suck the excess sizing agent to the sizing agent recycling system. The surface sizing agent is composed of acrylic resin, fluorine-free waterproofing agent, and silicone-modified acrylate. The mass ratio of acrylic resin: fluorine-free waterproofing agent: silicone-modified acrylate is 5:2:0.6, and the overall coating amount is controlled at 6%. D. Drying and winding: The wet paper sheet coated with glue is dried in a drying cylinder to obtain the final paper. The drying process is divided into three stages: high-temperature stage A at 140℃, high-temperature stage B at 150℃, and high-temperature stage C at 165℃. The paper basis weight is 76 g / m³. 2 The paper is produced at a speed controlled at 95m / min.

[0038] Dry waste paper generated during the drying and winding stage is fed back into the pulper for further processing to obtain shredded dry waste paper. The shredded dry waste paper and excess wet waste paper are then reused through a wet waste and dry waste paper recycling system.

[0039] like Figure 1 As shown, the adhesive recycling system includes a vacuum chamber 1, which is connected to a vacuum tank 2. The bottom of the vacuum tank 2 is connected to a vibrating screen 4 via a first transfer pump 3, which is connected to a transition tank 5 via the vibrating screen 4. The transition tank 5 is connected to a return adhesive tank 6, which is connected to a glue applicator via a second transfer pump 7. Excess adhesive from the transfer net is drawn into the vacuum tank 2 through the vacuum chamber 1. The gaseous adhesive liquefies and settles at the bottom of the vacuum tank 2. The adhesive at the bottom of the vacuum tank 2 flows through a steel wire hose, the first transfer pump 3, and the vibrating screen 4 to the transition tank 5. Fresh adhesive and return adhesive are mixed in the pipeline between the return adhesive tank 6 and the second transfer pump 7 (fresh adhesive: return adhesive mass ratio is 1.5:1), and then sent to the glue applicator for use via the second transfer pump 7.

[0040] like Figure 2 As shown, the wet and dry waste paper recycling system includes a wet waste tank 8, which is connected to a wet waste preparation tank 10 via a third transfer pump 9. A dry waste pulp tank 11 is connected to the wet waste preparation tank 10, and a wet waste concentration tank 12 is connected to the bottom of the wet waste preparation tank 10. Excess wet waste falls into the wet waste tank 8, and water is added to adjust the concentration to 1%. Then, it is pumped into the wet waste preparation tank 10 via the third transfer pump 9. The shredded dry waste paper is pumped from the dry waste pulp tank 11 into the wet waste preparation tank 10. After being mixed evenly at a mass ratio of 5% dry waste and 95% wet waste, it is pumped into the wet waste concentration tank 12 to adjust the concentration to 1%. Then, it is mixed with the shredded pulp obtained in step A at a mass ratio of 0.05:1 for use.

[0041] Example 5 The preparation method of the military-grade civil defense-specific fiberglass air filter material is as follows: Materials preparation: By weight, prepare 12 parts of glass wool with a diameter of 0.1-0.3μm and a beating degree of 54°SR, 45 parts of glass wool with a diameter of 0.4-0.6μm and a beating degree of 44°SR, 34 parts of glass wool with a diameter of 0.9-1.2μm and a beating degree of 19°SR, and 9 parts of short glass fiber filaments with a chopped length of 6mm and a diameter of 5μm. A. Pulping: Water is added to a hydrapulper, and the pH value is adjusted to 2.55 with sulfuric acid. Glass wool with a diameter of 0.1-0.3μm and a beating degree of 54°SR, glass wool with a diameter of 0.4-0.6μm and a beating degree of 44°SR, and glass wool with a diameter of 0.9-1.2μm and a beating degree of 19°SR are added and pulverized for 3 minutes. Then, chopped glass fibers with a length of 6mm and a diameter of 5μm are added and pulverized for 2 minutes. Finally, the mass concentration of fibers in water is controlled at 1.5%, and the pulverized pulp is obtained. B. Slurry preparation: After dispersion, the mixture is uniformly passed through a high-frequency disintegrator without cutting, and then enters the slurry preparation tank. The slurry concentration is controlled at 1% to obtain a mixed slurry suspension. C. Flow forming: The mixed pulp suspension is pumped to the inclined wire paper machine at a concentration of 0.4‰ for dewatering and forming on the forming wire. Excess wet loss falls into the wet loss tank 8. Then, the paper passes through the transfer wire and the sizing machine. The surface sizing solution is applied to the transfer wire by spraying, and the sizing pH value is controlled at 11. The vacuum pressure of the vacuum box 1 at the lower end of the transfer wire is controlled at -80kPa. The vacuum box 1 is used to suck the excess sizing solution to the sizing solution recycling system. The surface sizing solution is composed of acrylic resin, fluorine-free waterproofing agent and silicone-modified acrylate. The mass ratio of acrylic resin: fluorine-free waterproofing agent: silicone-modified acrylate is 6:0.5:0.1, and the overall coating amount is controlled at 8%. D. Drying and winding: The wet paper sheet coated with glue is dried in a drying cylinder to obtain the final paper. The drying process is divided into three stages: high-temperature stage A at 130℃, high-temperature stage B at 140℃, and high-temperature stage C at 155℃. The paper basis weight is 76 g / m³. 2 The paper is produced at a speed controlled at 85m / min.

[0042] Dry waste paper generated during the drying and winding stage is fed back into the pulper for further processing to obtain shredded dry waste paper. The shredded dry waste paper and excess wet waste paper are then reused through a wet waste and dry waste paper recycling system.

[0043] like Figure 1 As shown, the adhesive recycling system includes a vacuum chamber 1, which is connected to a vacuum tank 2. The bottom of the vacuum tank 2 is connected to a vibrating screen 4 via a first transfer pump 3, which is connected to a transition tank 5 via the vibrating screen 4. The transition tank 5 is connected to a return adhesive tank 6, which is connected to a glue applicator via a second transfer pump 7. Excess adhesive from the transfer net is drawn into the vacuum tank 2 through the vacuum chamber 1. The gaseous adhesive liquefies and settles at the bottom of the vacuum tank 2. The adhesive at the bottom of the vacuum tank 2 flows through a steel wire hose, the first transfer pump 3, and the vibrating screen 4 to the transition tank 5. Fresh adhesive and return adhesive are mixed in the pipeline between the return adhesive tank 6 and the second transfer pump 7 (fresh adhesive: return adhesive mass ratio is 1.5:1), and then sent to the glue applicator for use via the second transfer pump 7.

[0044] like Figure 2 As shown, the wet and dry waste paper recycling system includes a wet waste tank 8, which is connected to a wet waste preparation tank 10 via a third transfer pump 9. A dry waste pulp tank 11 is connected to the wet waste preparation tank 10, and a wet waste concentration tank 12 is connected to the bottom of the wet waste preparation tank 10. Excess wet waste falls into the wet waste tank 8, and water is added to adjust the concentration to 1%. Then, it is pumped into the wet waste preparation tank 10 via the third transfer pump 9. The shredded dry waste paper is pumped from the dry waste pulp tank 11 into the wet waste preparation tank 10. After being mixed evenly at a mass ratio of 5% dry waste and 95% wet waste, it is pumped into the wet waste concentration tank 12 to adjust the concentration to 1%. Then, it is mixed with the shredded pulp obtained in step A at a mass ratio of 0.05:1 for use.

[0045] Example 6 The preparation method of the military-grade civil defense-specific fiberglass air filter material is as follows: Materials preparation: By weight, prepare 12 parts of glass wool with a diameter of 0.1-0.3μm and a beating degree of 54°SR, 45 parts of glass wool with a diameter of 0.4-0.6μm and a beating degree of 44°SR, 34 parts of glass wool with a diameter of 0.9-1.2μm and a beating degree of 19°SR, and 9 parts of short glass fiber filaments with a chopped length of 6mm and a diameter of 9μm. A. Pulping: Water is added to a hydrapulper, and the pH value is adjusted to 2.55 with sulfuric acid. Glass wool with a diameter of 0.1-0.3μm and a beating degree of 54°SR, glass wool with a diameter of 0.4-0.6μm and a beating degree of 44°SR, and glass wool with a diameter of 0.9-1.2μm and a beating degree of 19°SR are added and pulverized for 3 minutes. Then, short glass fibers with a length of 6mm and a diameter of 9μm are added and pulverized for 2 minutes. Finally, the mass concentration of fibers in water is controlled at 1.5%, and the pulverized pulp is obtained. B. Slurry preparation: After dispersion, the mixture is uniformly passed through a high-frequency disintegrator without cutting, and then enters the slurry preparation tank. The slurry concentration is controlled at 1% to obtain a mixed slurry suspension. C. Flow forming: The mixed pulp suspension is pumped to the inclined wire paper machine at a concentration of 0.4‰ for dewatering and forming on the forming wire. Excess wet loss falls into the wet loss tank 8. Then, the paper passes through the transfer wire and the sizing machine. The surface sizing solution is applied to the transfer wire by spraying, and the sizing pH value is controlled at 11. The vacuum pressure of the vacuum box 1 at the lower end of the transfer wire is controlled at -80kPa. The vacuum box 1 is used to suck the excess sizing solution to the sizing solution recycling system. The surface sizing solution is composed of acrylic resin, fluorine-free waterproofing agent and silicone-modified acrylate. The mass ratio of acrylic resin: fluorine-free waterproofing agent: silicone-modified acrylate is 5:2:0.2, and the overall coating amount is controlled at 8%. D. Drying and winding: The wet paper sheet coated with glue is dried in a drying cylinder to obtain the final paper. The drying process is divided into three stages: high-temperature stage A at 130℃, high-temperature stage B at 140℃, and high-temperature stage C at 155℃. The paper basis weight is 76 g / m³. 2 The paper is produced at a speed controlled at 85m / min.

[0046] Dry waste paper generated during the drying and winding stage is fed back into the pulper for further processing to obtain shredded dry waste paper. The shredded dry waste paper and excess wet waste paper are then reused through a wet waste and dry waste paper recycling system.

[0047] like Figure 1 As shown, the adhesive recycling system includes a vacuum chamber 1, which is connected to a vacuum tank 2. The bottom of the vacuum tank 2 is connected to a vibrating screen 4 via a first transfer pump 3, which is connected to a transition tank 5 via the vibrating screen 4. The transition tank 5 is connected to a return adhesive tank 6, which is connected to a glue applicator via a second transfer pump 7. Excess adhesive from the transfer net is drawn into the vacuum tank 2 through the vacuum chamber 1. The gaseous adhesive liquefies and settles at the bottom of the vacuum tank 2. The adhesive at the bottom of the vacuum tank 2 flows through a steel wire hose, the first transfer pump 3, and the vibrating screen 4 to the transition tank 5. Fresh adhesive and return adhesive are mixed in the pipeline between the return adhesive tank 6 and the second transfer pump 7 (fresh adhesive: return adhesive mass ratio is 1.5:1), and then sent to the glue applicator for use via the second transfer pump 7.

[0048] like Figure 2 As shown, the wet and dry waste paper recycling system includes a wet waste tank 8, which is connected to a wet waste preparation tank 10 via a third transfer pump 9. A dry waste pulp tank 11 is connected to the wet waste preparation tank 10, and a wet waste concentration tank 12 is connected to the bottom of the wet waste preparation tank 10. Excess wet waste falls into the wet waste tank 8, and water is added to adjust the concentration to 1%. Then, it is pumped into the wet waste preparation tank 10 via the third transfer pump 9. The shredded dry waste paper is pumped from the dry waste pulp tank 11 into the wet waste preparation tank 10. After being mixed evenly at a mass ratio of 5% dry waste and 95% wet waste, it is pumped into the wet waste concentration tank 12 to adjust the concentration to 1%. Then, it is mixed with the shredded pulp obtained in step A at a mass ratio of 0.05:1 for use.

[0049] Comparative Example 1 Everything else is the same as in Example 1, except that: No glass wool with a diameter of 0.1-0.3μm and a percussion solubility of 54°SR was added.

[0050] Comparative Example 2 Everything else is the same as in Example 1, except that: No chopped glass fiber filaments were added.

[0051] Comparative Example 3 Everything else is the same as in Example 1, except that: It contains no fluorine-free waterproofing agent or silicone-modified acrylate.

[0052] Comparative Example 4 Everything else is the same as in Example 1, except that: No silicone-modified acrylate was added.

[0053] Comparative Example 5 Everything else is the same as in Example 1, except that: No fluorine-free waterproofing agent was added.

[0054] Comparative Example 6 Everything else is the same as in Example 1, except that: No acrylic resin was added.

[0055] The products prepared in Examples 1-6 and Comparative Examples 1-6 were tested, and the results are shown in Table 1.

[0056] Resistance and efficiency were tested according to EN1822-2009 standard, using a TSI8130A testing equipment. Stiffness testing was performed using a CF-520 Göller stiffness tester, and the applicable standards are as follows: ASTM D6125-97 (American Society for Testing and Materials); Water absorption was tested using a hydrostatic pressure tester according to GB / T 4744-1997; The longitudinal and transverse tensile forces were tested using a tensile strength tester according to GB / T12914-2008; The thickness was measured using a 100 kPa thickness gauge in accordance with GB / T 451.3-2002 "Determination of the thickness of paper and paperboard".

[0057] Table 1 Test Results

[0058] Example 5: Acrylic resin: fluorine-free waterproofing agent: silicone-modified acrylate = 6:0.5:0.1. The amount of acrylic resin is large, while the proportions of fluorine-free waterproofing agent and silicone-modified acrylate are small. The waterproofing is worse than in Examples 1-4. In addition, the longitudinal and transverse tensile strength is slightly higher than in Examples 1-4 because the acrylic resin itself also increases the strength of the material.

[0059] Example 6 uses short glass fiber filaments with a chopped length of 6mm and a diameter of 9μm. The most significant change in the data is that the stiffness is significantly increased. In addition, the resistance efficiency is slightly reduced. The increased stiffness makes it difficult for customers to fold paper, making it easy to fray, and the surface is uneven, which affects the appearance.

[0060] Comparative Example 1 did not use glass wool with a diameter of 0.1-0.3μm and a percussion degree of 54°SR, resulting in a significant reduction in resistance efficiency, which failed to meet the efficiency requirements of the paper. Comparative Example 2 did not include chopped glass fiber filaments, resulting in a significant reduction in stiffness, which did not meet the stiffness requirements of the air-resistant paper, and the tensile strength was also slightly reduced; Comparative Example 3 did not contain fluorine-free waterproofing agent and silicone-modified acrylate, resulting in a significant reduction in waterproofing, failing to meet the waterproofing requirements of civil defense paper, causing it to absorb moisture and soften after the filter was installed, leading to collapse. Comparative Example 4 did not contain silicone-modified acrylate, so its waterproofness was lower than that of human-proof paper. Over time, the filter would also soften due to moisture absorption and collapse. Comparative Example 5 did not contain a fluorine-free waterproofing agent, so its waterproofing is also lower than that of human-proof paper. Over time, the filter will soften due to moisture absorption and collapse. Comparative Example 6, which did not contain acrylic resin, showed a significant decrease in tensile strength, failing to meet the tensile strength requirements of the paper. As a result, the paper was prone to deformation and collapse when the airflow increased after the filter was installed.

Claims

1. A military-grade fiberglass air filter material specifically for civil defense, characterized in that, It is prepared from the following parts by weight of raw materials: Glass wool with a diameter of 0.1-0.3μm and a knockout degree of 54°SR: 12-18 parts; Glass wool with a diameter of 0.4-0.6 μm and a knockout degree of 44°SR: 35-45 parts; Glass wool with a diameter of 0.9-1.2μm and a knockout degree of 19°SR: 28-34 parts; Short-cut glass fiber filaments: 5-20 parts; It also includes a surface sizing agent applied to the aforementioned glass fiber air filter material, wherein the surface sizing agent is a mixture of acrylic resin, fluorine-free waterproofing agent, and silicone-modified acrylate.

2. The military-grade civil defense-specific fiberglass air filter material according to claim 1, characterized in that, The surface sizing adhesive is a mixture of acrylic resin, fluorine-free waterproofing agent, and silicone-modified acrylate in a mass ratio of (3-5):(1-2):(0.2-0.6).

3. The military-grade civil defense-specific fiberglass air filter material according to claim 2, characterized in that, The application rate of the surface sizing adhesive is 4-8%.

4. The military-grade civil defense-specific fiberglass air filter material according to claim 1, characterized in that, The chopped glass fiber filaments have a chopped length of 6 mm and a diameter of 5 μm.

5. A method for preparing military-grade civil defense-specific fiberglass air filter material according to any one of claims 1-4, characterized in that, It is prepared by the following steps: A. Pulping: Add water to the pulper, adjust the pH, add glass wool with a diameter of 0.1-0.3μm, glass wool with a diameter of 0.4-0.6μm and glass wool with a diameter of 0.9-1.2μm for pulping; then add short glass fiber filaments for pulping, and control the mass concentration at 1-3% to obtain the pulped slurry; B. Slurry preparation: After crushing, the slurry is uniformly processed through a high-frequency disintegrator without cutting, and then enters the slurry preparation tank to obtain a mixed slurry suspension; C. Flow forming: After diluting the mixed slurry suspension, it is pumped to the inclined wire paper machine for papermaking and dewatering. It is dewatered and formed on the forming wire. Excess wet waste will fall into the wet waste pool (8). Then the paper passes through the transfer wire and the sizing machine. The surface sizing liquid is applied to the transfer wire by the glue spraying method. The lower end of the transfer wire is equipped with a vacuum box (1). The vacuum box (1) is used to suck the excess glue liquid to the glue liquid recycling system. D. Drying and winding: The wet paper sheets coated with glue are dried in a drying cylinder to obtain the final paper; Dry waste paper generated during the drying and winding stage is fed back into the pulper for further processing to obtain shredded dry waste paper. The shredded dry waste paper and excess wet waste paper are then reused through a wet waste and dry waste paper recycling system.

6. The method for preparing military-grade civil defense-specific fiberglass air filter material according to claim 5, characterized in that, The adhesive recycling system includes a vacuum box (1), which is connected to a vacuum tank (2). The bottom of the vacuum tank (2) is connected to a vibrating screen (4) via a first transfer pump (3). The vibrating screen (4) is connected to a transition tank (5). The transition tank (5) is connected to a return adhesive tank (6). The return adhesive tank (6) is connected to a glue applicator via a second transfer pump (7). Excess adhesive from the transfer net is drawn into the vacuum tank (2) through the vacuum box (1). The gaseous adhesive is liquefied and deposited at the bottom of the vacuum tank (2). The adhesive at the bottom of the vacuum tank (2) flows through a steel wire hose, through the first transfer pump (3), and through the vibrating screen (4) to the transition tank (5). Fresh adhesive is transported to the transition tank (5) through the fresh adhesive pipeline for mixing, and then sent to the return adhesive tank (6). The fresh adhesive and the return adhesive are mixed on the pipeline between the return adhesive tank (6) and the second transfer pump (7) and then sent to the glue applicator for use by the second transfer pump (7).

7. The method for preparing military-grade civil defense-specific fiberglass air filter material according to claim 5, characterized in that, The wet and dry paper recycling system includes a wet waste tank (8), which is connected to a wet waste preparation tank (10) via a third transfer pump (9). A dry waste pulp tank (11) is connected to the wet waste preparation tank (10). The bottom of the wet waste preparation tank (10) is connected to a wet waste concentration tank (12). Excess wet waste falls into the wet waste tank (8), and after adding water to adjust the concentration, it is pumped into the wet waste preparation tank (10) via the third transfer pump (9). The shredded dry waste paper is pumped from the dry waste pulp tank (11) into the wet waste preparation tank (10), mixed evenly, and then pumped into the wet waste concentration tank (12) to adjust the concentration and mix with the shredded pulp obtained in step A for use.

8. The method for preparing military-grade civil defense-specific fiberglass air filter material according to claim 5, characterized in that, The pH value for applying the sizing in step C is 8-11.

9. The method for preparing military-grade civil defense-specific fiberglass air filter material according to claim 5, characterized in that, Step D involves drying the drying cylinder in three sections: high temperature section a (130-140℃), high temperature section b (140-150℃), and high temperature section c (155-165℃).

10. The method for preparing military-grade civil defense-specific fiberglass air filter material according to claim 5, characterized in that, In step D, the paper basis weight is 72-76 g / m³. 2 The production speed is controlled at 85-95m / min.

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