High-performance composite glass fiber filter material and preparation method and application thereof

Abstract

This invention discloses a high-performance composite glass fiber filter material, its preparation method, and its application, belonging to the field of filter material technology. The material comprises: a first waterproof nonwoven fabric layer, a first adhesive layer, a glass fiber base fabric layer, a second adhesive layer, and a second waterproof nonwoven fabric layer; both the first and second adhesive layers are polyolefin-based non-pressure-sensitive hot-melt adhesive layers. During preparation, the first adhesive layer is sequentially sprayed onto the first waterproof nonwoven fabric layer, followed by the placement of the glass fiber base fabric layer, then the spraying of the second adhesive layer, and finally the placement of the second waterproof nonwoven fabric layer, followed by hot-pressing lamination. This invention, through its multi-layer design, achieves excellent double-sided waterproof performance without the need for additional waterproofing agents, while significantly improving the material's tensile strength and bending resistance, avoiding the risk of glass fiber detachment, and without increasing filtration resistance. It can be widely used in respiratory protection, air purification, and industrial filtration.

Description

Technical Field

[0001] This invention relates to the field of filtration materials technology, and in particular to a high-performance composite glass fiber filtration material, its preparation method, and its application. Background Technology

[0002] Fiberglass filter materials play a crucial role in industrial filtration due to their core properties such as high temperature resistance, corrosion resistance, and dimensional stability. Their applications are evolving from traditional high-temperature flue gas filtration to more efficient and complex fields.

[0003] Applications in complex and demanding operating conditions mainly focus on the following two areas: First, waste incineration and biomass power generation: the flue gas composition is complex, with high humidity and high dew point. The waterproof and oil-proof properties of membrane-coated fiberglass filter media are indispensable here, effectively preventing bag clogging and achieving stable ultra-low emissions; Second, chemical and non-ferrous smelting: dealing with highly corrosive gases containing sulfur and fluorine. The inherent chemical corrosion resistance of fiberglass, coupled with appropriate surface treatment, makes it a reliable choice.

[0004] In the field of high-precision air purification, it belongs to high-end application scenarios with relatively more stringent requirements. It mainly focuses on high-efficiency air filters (HEPA / ULPA), which utilize the extremely fine fiber diameter and uniform pores of glass fiber filter paper to achieve a filtration efficiency of over 99.97% for particles larger than 0.3 microns. It is the "heart" material for cleanrooms, semiconductors, pharmaceuticals, nuclear industries, and personal protective equipment, as well as other places with extremely high air cleanliness requirements or respiratory protection.

[0005] In the field of personal protective equipment, when fiberglass is used as a basic filtration or reinforcing material, there are a series of significant pain points. These pain points mainly stem from the fundamental contradiction between the inherent properties of the material and ergonomic and safety requirements.

[0006] Pain Point 1: Not resistant to bending and abrasion. Fiberglass is brittle and easily breaks when repeatedly bent or rubbed. This defect leads to the failure of material properties and fiber shedding, resulting in loss of protection and the creation of new hazards (broken fibers falling and being inhaled).

[0007] Pain Point Two: Skin and Respiratory Irritation. Fiberglass monofilaments are typically larger than 4 micrometers in diameter, with a hard surface and potential residue of processing lubricants. If such materials are used in respiratory protective products, fiber breakage and abrasion during use can generate inhalable fibrous dust. Long-term exposure to this dust, whether direct or indirect, can cause itching, redness, and allergies on the skin and respiratory tract (nasal cavity, throat, lungs, etc.), posing a significant health risk. This seriously violates the principle of prioritizing safety in respiratory protective equipment.

[0008] Pain Point 3: The contradiction between waterproofing and breathability / moisture permeability; When high-efficiency filtration fiberglass materials are applied to dustproof breathing products, their dense structure leads to higher breathing resistance than ordinary fiberglass filter materials; In actual application scenarios such as splashing water, high ambient moisture content, and high breathing humidity, fiberglass itself is not waterproof, and untreated fiberglass will experience a significant increase in resistance after becoming wet, to the point of making breathing impossible; at the same time, its structural strength will also decrease, and it may exacerbate fiber shedding, thus posing a greater health threat. Summary of the Invention

[0009] The present invention aims to solve the above-mentioned technical problems existing in the existing glass fiber filter materials, and to provide a high-performance composite glass fiber filter material with excellent waterproof performance, tensile strength, bending resistance and low filtration resistance, as well as its preparation method and application.

[0010] To achieve the above objectives, the present invention adopts the following technical solution: A high-performance composite fiberglass filter material includes: a first waterproof nonwoven fabric layer, a first adhesive layer, a fiberglass base fabric layer, a second adhesive layer, and a second waterproof nonwoven fabric layer; wherein, The first adhesive layer is disposed between the first waterproof nonwoven fabric layer and the fiberglass base fabric layer, and the first waterproof nonwoven fabric layer and the fiberglass base fabric layer are fixedly connected by the first adhesive layer disposed between them; the second adhesive layer is disposed between the fiberglass base fabric layer and the second waterproof nonwoven fabric layer, and the fiberglass base fabric layer and the second waterproof nonwoven fabric layer are fixedly connected by the second adhesive layer disposed between them. The first and second adhesive layers are polyolefin-based non-pressure-sensitive hot melt adhesive layers or acrylic adhesive layers.

[0011] In a preferred embodiment, the acrylate adhesive layer uses an adhesive from the Nipol LX series.

[0012] Furthermore, the first waterproof nonwoven fabric layer and the second waterproof nonwoven fabric layer are each independently selected from at least one of PP, PE, PET, or a composite material of PP and PE.

[0013] Furthermore, the basis weights of the first waterproof nonwoven fabric layer and the second waterproof nonwoven fabric layer are independently 15 gsm-60 gsm.

[0014] Furthermore, the basis weight of the fiberglass base layer is 40 gsm-120 gsm.

[0015] This invention also provides a method for preparing the above-mentioned high-performance composite glass fiber filter material, comprising the following steps: S1. Provide the first waterproof non-woven fabric layer; S2. Spray the first adhesive layer onto the upper part of the first waterproof nonwoven fabric layer. The unit area of ​​the first adhesive layer sprayed with a weight of 2gsm-10gsm is 2gsm-10gsm. S3. Place a fiberglass base layer on the first adhesive layer; S4. Spray a second adhesive layer onto the upper part of the fiberglass base fabric layer. The unit area of ​​the first adhesive layer sprayed with a basis weight of 2gsm-10gsm is 2gsm-10gsm. S5. Place a second waterproof nonwoven fabric layer on the first adhesive layer.

[0016] The present invention also provides an application of the above-mentioned high-performance composite glass fiber filter material in respiratory protection, air purification or industrial filtration.

[0017] The present invention adopts the above technical solution and has the following technical effects compared with the prior art: This invention eliminates the need for additional waterproofing agents for surface treatment. After multi-layer composite, it successfully solves the problems of only one-sided waterproofing and poor splash resistance, greatly improving the overall waterproof performance of composite fiberglass filter materials and their chemical safety in the field of respiratory protection.

[0018] It significantly improves the tensile strength and bending resistance of the original glass fiber material, making it well applicable to the production of pleated filter media. It avoids wear and breakage of glass fiber filter media during the production process and significantly reduces the risk of inhalation during use.

[0019] Compared with the original fiberglass substrate, the resistance of composite fiberglass does not increase significantly, or even remains unchanged, and the stability of filtration efficiency is improved. Attached Figure Description

[0020] Figure 1 This is a cross-sectional structural diagram of the present invention. Explanation of reference numerals in the attached drawings: 1-First waterproof nonwoven fabric layer; 2-First adhesive layer; 3-Fiberglass base fabric layer; 4-Second adhesive layer; 5-Second waterproof nonwoven fabric layer. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0023] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the scope of the invention.

[0024] Example 1 This embodiment provides a high-performance composite glass fiber filter material, the structure of which includes a first waterproof non-woven fabric layer 1, a first adhesive layer 2, a glass fiber base fabric layer 3, a second adhesive layer 4, and a second waterproof non-woven fabric layer 5 stacked sequentially. The first waterproof non-woven fabric layer 1 and the second waterproof non-woven fabric layer 5 are both made of PP material with a weight of 60gsm. The fiberglass base layer 3 uses fiberglass filter paper with a basis weight of 40 gsm; In this embodiment, both the first adhesive layer 2 and the second adhesive layer 4 are polyolefin-based non-pressure-sensitive hot melt adhesive layers, and the spray weight per unit area is 5 gsm.

[0025] The above-mentioned method for preparing a high-performance composite glass fiber filter material: S1. Provide the first waterproof non-woven fabric layer 1; S2. Spray the first adhesive layer 2 evenly on its upper surface, with a weight of 5gsm; S3. Lay the fiberglass base fabric layer 3 flat on the first adhesive layer 2; S4. Spray the second adhesive layer 4 evenly on the upper surface of the fiberglass base fabric layer 3, with a basis weight of 5 gsm; S5. The second waterproof nonwoven fabric layer 5 is covered on the second adhesive layer 4 and then hot-pressed to obtain the final product.

[0026] Performance testing: The resulting composite material has a basis weight of 170 gsm, a filter resistance of <110 Pa, a penetration rate of <15%, a longitudinal tensile strength of >2.3 kN / m, a transverse tensile strength of >1.0 kN / m, and a water repellency of >120 kPa. Compared with ordinary fiberglass materials, it has significant improvements in both strength and water resistance.

[0027] Example 2 This embodiment provides a high-performance composite glass fiber filter material, which has the same structure as in Embodiment 1, and the parameters of each layer are as follows: The first waterproof non-woven fabric layer 1 and the second waterproof non-woven fabric layer 5 are both made of PE material with a weight of 15gsm. The fiberglass base layer 3 uses fiberglass filter paper with a basis weight of 75 gsm; In this embodiment, both the first adhesive layer 2 and the second adhesive layer 4 are polyolefin-based non-pressure-sensitive hot melt adhesives, and the spray weight per unit area is 2 gsm.

[0028] Preparation method: Same as in Example 1.

[0029] Performance testing: The resulting composite material has a basis weight of 109 gsm, a filter media resistance of <325 Pa, a penetration rate of <0.03%, a longitudinal tensile strength of >1.6 kN / m, a transverse tensile strength of >0.6 kN / m, and a water repellency of >80 kPa, making it suitable for high-efficiency filtration applications.

[0030] Example 3 This embodiment provides a high-performance composite glass fiber filter material, which has the same structure as in Embodiment 1, and the parameters of each layer are as follows: The first waterproof non-woven fabric layer 1 and the second waterproof non-woven fabric layer 5 are both made of PET non-woven fabric with a weight of 30gsm. The fiberglass base layer 3 uses fiberglass filter paper with a basis weight of 90 gsm; The first adhesive layer 2 and the second adhesive layer 4 are both polyolefin-based non-pressure-sensitive hot melt adhesives, with a spray weight of 4 gsm per unit area.

[0031] Preparation method: Same as in Example 1.

[0032] Performance testing: The resulting composite material has a basis weight of 158 gsm, a filter media resistance of <360 Pa, a penetration rate of <0.03%, a longitudinal tensile strength of >2.5 kN / m, a transverse tensile strength of >1.2 kN / m, and a water repellency of >100 kPa, exhibiting excellent comprehensive performance.

[0033] Example 4 This embodiment provides a high-performance composite glass fiber filter material, which has the same structure as in Embodiment 1, and the parameters of each layer are as follows: The first waterproof nonwoven fabric layer 1 and the second waterproof nonwoven fabric layer 5 are both made of PP / PE composite nonwoven fabric with a basis weight of 20gsm. The fiberglass base layer 3 uses fiberglass filter paper with a basis weight of 120 gsm; The first adhesive layer 2 and the second adhesive layer 4 are both polyolefin-based non-pressure-sensitive hot melt adhesives, with a spray weight of 3 gsm per unit area.

[0034] Preparation method: Same as in Example 1.

[0035] Performance testing: The resulting composite material has a basis weight of 166 gsm, a filter media resistance of <390 Pa, a penetration rate of <0.03%, a longitudinal tensile strength of >2.6 kN / m, a transverse tensile strength of >1.4 kN / m, and a water repellency of >110 kPa. It is suitable for harsh working environments such as high-strength and high-humidity conditions.

[0036] Comparative Example To better illustrate the beneficial effects of the present invention, comparative examples 1-4 are provided, corresponding to the ordinary fiberglass base fabric (without composite waterproof nonwoven fabric layer) used in examples 1-4, respectively. Their performance data can be found in the "Ordinary Fiberglass" row of the performance test table 1 of each example.

[0037] Table 1

[0038] As can be seen from the above embodiments and comparative examples, the present invention significantly improves the tensile strength, bending resistance and waterproof performance of materials through a multi-layer composite structure, while maintaining low filtration resistance, making it suitable for multiple fields such as respiratory protection, air purification and industrial filtration.

[0039] The above description of the present invention is merely a preferred embodiment of the present invention and does not limit the implementation and protection scope of the present invention. Those skilled in the art should realize that any equivalent substitutions and obvious changes made based on the description and illustrations of the present invention should be included within the protection scope of the present invention.

Claims

1. A high-performance composite glass fiber filter material, characterized in that, include: The first waterproof nonwoven fabric layer (1), the first adhesive layer (2), the fiberglass base fabric layer (3), the second adhesive layer (4), and the second waterproof nonwoven fabric layer (5); The first adhesive layer (2) is disposed between the first waterproof nonwoven fabric layer (1) and the fiberglass base fabric layer (3), and the first waterproof nonwoven fabric layer (1) and the fiberglass base fabric layer (3) are fixedly connected by the first adhesive layer (2) disposed between them. The second adhesive layer (4) is disposed between the fiberglass base fabric layer (3) and the second waterproof nonwoven fabric layer (5), and the fiberglass base fabric layer (3) and the second waterproof nonwoven fabric layer (5) are fixedly connected by the second adhesive layer (4) disposed between them; The first adhesive layer (2) and the second adhesive layer (4) are polyolefin-based non-pressure-sensitive hot melt adhesive layers or acrylate adhesive layers.

2. The high-performance composite glass fiber filter material according to claim 1, characterized in that, The first waterproof nonwoven fabric layer (1) and the second waterproof nonwoven fabric layer (5) are each independently selected from at least one of PP, PE, PET, or a composite material of PP and PE.

3. The high-performance composite glass fiber filter material according to claim 1, characterized in that, The basis weights of the first waterproof nonwoven fabric layer (1) and the second waterproof nonwoven fabric layer (5) are 15 gsm-60 gsm, respectively.

4. The high-performance composite glass fiber filter material according to claim 1, characterized in that, The basis weight of the fiberglass base fabric layer (3) is 40 gsm-120 gsm.

5. A method for preparing a high-performance composite glass fiber filter material as described in any one of claims 1-4, characterized in that the step include: S1. Provide the first waterproof nonwoven fabric layer (1); S2. Spray the first adhesive layer (2) onto the upper part of the first waterproof nonwoven fabric layer (1), and the unit area of ​​the first adhesive layer (2) is sprayed with a weight of 2gsm-10gsm. S3. Place the fiberglass base fabric layer (3) on the first adhesive layer (2); S4. Spray the second adhesive layer (4) onto the upper part of the fiberglass base fabric layer (3), wherein the unit area of ​​the first adhesive layer (4) is sprayed with a basis weight of 2gsm-10gsm. S5. Place the second waterproof nonwoven fabric layer (5) on the first adhesive layer (4).

6. The application of a high-performance composite glass fiber filter material as described in any one of claims 1-5 in respiratory protection, air purification or industrial filtration.

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