A method for preparing military-grade transparent glass membrane material

Abstract

This invention provides a method for preparing military-grade transparent glass membrane materials, belonging to the field of high-performance composite membrane technology. The invention includes the following steps: S1 heat treatment of the base fabric, S2 coating preparation, and S3 post-treatment. In the coating preparation process, the raw materials used include PTFE emulsion, fluorinated ethylene propylene copolymer, silane coupling agent, glass microspheres, and nonionic fluorinated surfactants. The PTFE coating is prepared through impregnation, drying, baking, sintering, and cooling processes. This invention overcomes the limitation of existing PTFE membrane strength enhancement relying on the addition of a single component through synergistic innovation in formulation and process. By precisely proportioning PTFE emulsion, glass microspheres, and additives, and synergistically optimizing process parameters, a balance of multiple properties—mechanical strength, flame retardancy, flexibility, and environmental adaptability—is achieved, solving the technical pain points in existing technologies such as the incompatibility between high strength and high peelability, and the contradiction between flame retardancy and processability.

Description

Technical Field

[0001] This invention belongs to the field of high-performance composite membrane technology, and relates to a method for preparing a military-grade transparent glass membrane. Background Technology

[0002] High-performance membrane materials play a crucial role in military equipment applications, such as field tents, mobile command posts, and equipment camouflage coverings. These applications typically involve harsh environments, requiring materials with extremely high mechanical properties, excellent durability, and reliable flame retardancy. Currently, commonly used membrane materials in this field mainly include PVC-coated fabrics and silicone-coated fabrics.

[0003] However, these existing membrane materials still have a number of significant shortcomings in meeting the ever-increasing military requirements: First, their mechanical properties are insufficient, making them unable to withstand extreme stress. Many existing membrane materials have limited tensile strength and tear load, and under extreme mechanical conditions such as strong winds, snow accumulation, or accidental impacts, they are prone to tearing of the base fabric or peeling of the coating, leading to overall material failure and making it difficult to guarantee the long-term reliability of military facilities and the safety of personnel and equipment.

[0004] Secondly, durability and weather resistance need to be improved. Traditional membrane materials are prone to problems such as coating chalking, aging, and brittleness after long-term exposure to natural environments such as ultraviolet rays, temperature changes, and rain erosion. This not only affects their protective performance but also significantly reduces their mechanical strength, shortens their service life, and increases the frequency and cost of military logistics maintenance.

[0005] Third, the flame retardant safety rating fails to meet high standards. Military applications have extremely stringent requirements for the flame retardancy of materials (usually requiring a rating of B or higher). Some existing membrane materials have insufficient flame retardant ratings, or although they may meet certain standards, they may produce large amounts of toxic fumes in actual fire situations, posing significant safety hazards and failing to meet high military safety requirements.

[0006] Fourth, balancing functionality and lightweighting is difficult. Achieving high strength often requires increasing the areal density of materials, resulting in bulky membranes that are not conducive to rapid deployment; while pursuing lightweighting often comes at the cost of strength and durability. Existing technologies lack a solution that can achieve the optimal balance between ultimate mechanical performance, long-term durability, high-level flame retardant safety, and controllable weight.

[0007] In summary, the membrane materials currently used in military equipment have significant shortcomings in overall performance, necessitating an innovative, high-performance transparent membrane material that combines ultra-high strength, excellent weather resistance, high flame retardancy, and meets the requirements of special military applications. (Invention Content) The purpose of this invention is to address the aforementioned problems in existing technologies by proposing a method for preparing military-grade transparent glass membrane materials.

[0008] This invention includes the following: a method for preparing a military-grade transparent glass membrane material, specifically comprising the following steps: S1 base fabric heat treatment: The base fabric is heated to remove the sizing agent from the glass fiber weaving process. After the heat treatment is completed, it is cooled. The base fabric is made of glass fiber. Preparation of S2 coating: S2.1 Basic Modification and Flexibility Treatment: The base fabric treated in step S1 is immersed in an impregnation solution containing sub-nanometer PTFE emulsion and fluorinated ethylene propylene copolymer. After impregnation and sizing, it is dried, baked, sintered and cooled in sequence. S2.2 Functional structure layer construction: The base fabric treated in step S2.1 is immersed in an impregnation solution containing sub-nano PTFE emulsion, silane coupling agent and glass microspheres. After impregnation and sizing, drying, baking, sintering and cooling are carried out in sequence. S2.3 Surface treatment: The base fabric treated in step S2.2 is immersed in an impregnation solution containing sub-nano PTFE emulsion and nonionic fluorinated surfactant. After the impregnation and sizing are completed, drying, baking, sintering and cooling are carried out in sequence. S3 Post-processing: The base fabric processed in step S2 is wound up, cut and packaged to obtain military transparent glass film material.

[0009] Preferably, in step S1, the heating temperature is 250-330℃.

[0010] Preferably, in step S2, all drying operations are carried out by natural air drying.

[0011] Preferably, in step S2.1, the impregnation solution contains 0.5-6% fluorinated ethylene propylene copolymer and 25-60% PTFE emulsion; the baking temperature is 120-200℃; and the sintering temperature is 300-380℃.

[0012] In step S2.2, the impregnation solution contains 2.5-8% silane coupling agent, 25-60% PTFE emulsion and 2-17% glass microspheres; the baking temperature is 120-200℃; and the sintering temperature is 300-380℃.

[0013] In step S2.3, the impregnation solution contains 0.5-2% nonionic fluorinated surfactant and 25-60% PTFE emulsion; the baking temperature is 120-200℃; and the sintering temperature is 300-380℃.

[0014] Preferably, the particle size D50 of the glass microspheres is 2-40 micrometers.

[0015] Preferably, the sub-nano PTFE emulsion is FR303A type emulsion or D210 type emulsion; the silane coupling agent is any one of KH-550, KH-560, and KH-570; and the nonionic fluorinated surfactant is any one of 3MFC-4430, 3MFC-4432, FS-3100, and FS-30 type surfactants.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. Breakthrough Improvement in Mechanical Properties to Meet High-Intensity Military Application Requirements: This invention achieves synergistic enhancement of the membrane's mechanical properties by optimizing the PTFE coating's compounding system and production process parameters. By compounding glass microspheres of a specific particle size with PTFE emulsion, the glass microspheres form a rigid support network within the coating, filling the gaps between PTFE molecules. Combined with a segmented sintering process, this promotes interfacial fusion between the coating and the glass fiber substrate, resulting in a membrane with a warp and weft tensile strength of ≥10000N / 5cm, a tear load of ≥1000N, and a peel strength of ≥100N. Compared to existing military-grade PTFE / glass fiber membranes, this significantly improves mechanical strength, enabling it to withstand the high tensile, tearing, and complex assembly stresses required in military scenarios, effectively preventing coating peeling and substrate breakage during use.

[0017] 2. Balancing Flame Retardancy and Practicality, Adaptable to Complex Military Environments: While ensuring ultra-high mechanical properties, this invention achieves Class B flame retardancy as specified in GB / T30161 standard through the synergistic optimization of the flame-retardant properties of the PTFE emulsion and the formulation system. It does not produce toxic or harmful gases upon contact with fire and leaves no dripping residue after combustion, meeting the fire safety regulations for military facilities. Simultaneously, the heat treatment process removes residual impurities and stress from the base fabric, and the appropriate ratio of softener ensures that the membrane maintains good flexibility while possessing high strength. This facilitates cutting, folding, transportation, and on-site installation in military settings, solving the problems of excessive rigidity and poor processing adaptability commonly found in existing high-strength membrane materials.

[0018] 3. Strong environmental adaptability, extending the service life of military equipment: This invention optimizes coating uniformity through surfactants and enhances the compatibility of glass microspheres and PTFE emulsion through dispersants, forming a dense and uniform protective layer on the membrane surface. This layer possesses excellent resistance to high and low temperatures, damp heat, and UV aging. It can adapt to various extreme military environments such as field, marine, and high-temperature environments, effectively extending the service life of military equipment and reducing maintenance and replacement costs.

[0019] In summary, this invention overcomes the limitations of existing PTFE membranes that rely on the addition of a single component for strength enhancement through synergistic innovation in formulation and process. By precisely proportioning PTFE emulsion, glass microspheres, and additives, and synergistically optimizing process parameters, it achieves a balance of multiple properties, including mechanical strength, flame retardancy, flexibility, and environmental adaptability. This solves the technical pain points of existing technologies, such as the incompatibility between high strength and high peel strength, and the contradiction between flame retardancy and processability. Its unique ingredient combination and segmented sintering process constitute a significant technical barrier that is difficult to replace, providing a superior and more reliable technical solution for military-grade transparent glass membranes. Attached Figure Description Figure 1 This is a schematic diagram of the process flow for the preparation method of the military transparent glass membrane material of the present invention. Detailed Implementation

[0020] The following are specific embodiments and accompanying drawings of the present invention, which further describe the technical solutions of the present invention, but the present invention is not limited to these embodiments.

[0021] Product Specifications: 1. Coating type: limited to PTFE coating; base fabric type: limited to glass fiber.

[0022] 2. Unit mass area, base fabric thickness: 2000±100g / ㎡, coating thickness: 1.2±0.2mm (reference standard: FZ / T01003).

[0023] 3. Flame retardant performance: Class B (Reference test standard: GB / T30161).

[0024] 4. Tensile strength (N / 5cm): Warp ≥10000, Weft ≥10000 (Reference test standards: GB / T30161, GB / T3923.1).

[0025] 5. Tear load (N): Warp ≥1000, Weft ≥1000 (Reference test standards: GB / T30161, GB / T3917.3).

[0026] 6. Peel strength (N): ≥100 (Reference test standard: FZ / T60039).

[0027] like Figure 1 As shown, the specific manufacturing process of the product is as follows: A method for preparing a military-grade transparent glass membrane material includes the following steps: Heat treatment of the base fabric: High-temperature removal of the sizing agent from the glass fiber weaving process, temperature 300℃, machine speed 0.8m / min, time 1.5h; Impregnation and sizing (3 times): The heat-treated base fabric is impregnated with sub-nano PTFE emulsion (concentration 45%) + 3% softener (fluorinated ethylene propylene copolymer) for 40 min at a speed of 0.8 m / min; the sub-nano PTFE emulsion is FR303A type emulsion; Drying: The surface is rolled to remove air bubbles and then air-dried; Baking: 180℃; 1.5h; Sintering: 350℃; 40 min; Impregnation and sizing (5 times): The base fabric after the above impregnation is impregnated with sub-nano PTFE emulsion (concentration 45%) + 5% silane coupling agent KH-550 + 12% glass microspheres (D50: 2-40 microns) for 340 min at a speed of 0.8 m / min. Drying: The surface is rolled to remove air bubbles and then air-dried; Baking: 180℃; 1.5h; Sintering: 350℃; 40 min; Impregnation and sizing (2 times): The base fabric after the above impregnation is impregnated with sub-nano PTFE emulsion (concentration 45%) + 1.5% nonionic fluorinated surfactant (FS-30) for 40 min at a speed of 0.8 m / min. Drying: Remove air bubbles by rolling the surface and air dry; Baking: 180℃; 1.5h; Sintering: 350℃; 40min; Finally, the product is cooled, rolled up, cut, and packaged.

[0028] The prepared membrane material was subjected to performance testing, and the test results are shown in Table 1:

[0029] The specific embodiments described herein are merely illustrative examples illustrating the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or substitute them with similar methods, without departing from the spirit of the invention or exceeding its defined scope. Although the invention has been detailed and described in the accompanying drawings and foregoing description, such descriptions are considered illustrative or exemplary rather than restrictive. It should be understood that changes and modifications can be made by those skilled in the art within the scope of the following claims.

Claims

1. A method for preparing a military-grade transparent glass membrane material, characterized in that, Includes the following steps: S1 base fabric heat treatment: The base fabric is heated to remove the sizing agent from the glass fiber weaving process. After the heat treatment is completed, it is cooled. The base fabric is made of glass fiber. Preparation of S2 coating: S2.1 Basic Modification and Flexibility Treatment: The base fabric treated in step S1 is immersed in an impregnation solution containing sub-nanometer PTFE emulsion and fluorinated ethylene propylene copolymer. After impregnation and sizing, it is dried, baked, sintered and cooled in sequence. S2.2 Functional structure layer construction: The base fabric treated in step S2.1 is immersed in an impregnation solution containing sub-nano PTFE emulsion, silane coupling agent and glass microspheres. After impregnation and sizing, drying, baking, sintering and cooling are carried out in sequence. S2.3 Surface treatment: The base fabric treated in step S2.2 is immersed in an impregnation solution containing sub-nano PTFE emulsion and nonionic fluorinated surfactant. After the impregnation and sizing are completed, drying, baking, sintering and cooling are carried out in sequence. S3 Post-processing: The base fabric processed in step S2 is wound up, cut and packaged to obtain military transparent glass film material.

2. The method for preparing military-grade transparent glass membrane material as described in claim 1, characterized in that, In step S1, the heating temperature is 250-330℃.

3. The method for preparing military-grade transparent glass membrane material as described in claim 1, characterized in that, In step S2, all drying operations are carried out by natural air drying.

4. The method for preparing military-grade transparent glass membrane material as described in claim 1, characterized in that, In step S2.1, the impregnation solution contains 0.5-6% fluorinated ethylene propylene copolymer and 25-60% PTFE emulsion; the baking temperature is 120-200℃; and the sintering temperature is 300-380℃.

5. The method for preparing military-grade transparent glass membrane material as described in claim 1, characterized in that, In step S2.2, the impregnation solution contains 2.5-8% silane coupling agent, 25-60% PTFE emulsion and 2-17% glass microspheres; the baking temperature is 120-200℃; and the sintering temperature is 300-380℃.

6. The method for preparing military-grade transparent glass membrane material as described in claim 1, characterized in that, In step S2.3, the impregnation solution contains 0.5-2% nonionic fluorinated surfactant and 25-60% PTFE emulsion; the baking temperature is 120-200℃; and the sintering temperature is 300-380℃.

7. The method for preparing military-grade transparent glass membrane material as described in claim 1, characterized in that, The particle size D50 of the glass microspheres is 2-40 micrometers.

8. The method for preparing military-grade transparent glass membrane material as described in claim 1, characterized in that, The sub-nanometer PTFE emulsion is either FR303A or D210 type emulsion; the silane coupling agent is any one of KH-550, KH-560, or KH-570; and the nonionic fluorinated surfactant is any one of 3MFC-4430, 3MFC-4432, FS-3100, or FS-30 type surfactants.

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