High-strength airtight material and method for manufacturing the same

Abstract

The application discloses a preparation method of high-strength air-tight material and belongs to the technical field of composite materials. The preparation method comprises the following steps: pasting on paste on both sides of high-strength mesh cloth, and then drying to obtain high-strength mesh cloth with paste; and then pasting preheated surface film and bottom film on both sides of the preheated high-strength mesh cloth with paste. The temperature of the preheated high-strength mesh cloth with paste is 176-192 DEG C, the pasting temperature is 166-178 DEG C, and the temperature of the preheated high-strength mesh cloth with paste is higher than the pasting temperature. The preparation method increases the preheating temperature of the mesh cloth and reduces the pasting temperature, ensures that air bubbles are expelled without generating new air bubbles, and makes the obtained product have good air tightness, tear resistance and peeling performance, and the surface is smooth and free of air bubble concave holes.

Description

Technical Field

[0001] This invention belongs to the field of composite material technology, specifically relating to a high-strength, airtight material and its preparation method. Background Technology

[0002] Traditional quarrying methods require pre-carving slots to accommodate jacks, which is labor-intensive and resource-intensive, and also poses a safety hazard of stones slipping. Rockfill airbags, with their thin structure, can easily slide into the saw cut to push stones aside, offering safety, saving effort, and ensuring the integrity of the stones. However, this requires materials with high strength and high wear resistance. Currently, the base fabric used in commonly available rockfill airbag materials is not strong enough and is easily damaged by prolonged contact and friction with hard stones. To improve the material's strength and extend its service life, high-strength polyester fiber mesh is used instead of ordinary mesh. However, the mesh woven from high-density yarn is too coarse and dense, and the uneven surface makes it difficult for the paste to penetrate into the mesh gaps, affecting the adhesion between the base fabric and the PVC film. This makes the material surface prone to air bubbles and pores, posing a risk of bursting during subsequent inflation. Summary of the Invention

[0003] The technical problem to be solved by this invention is: how to prepare a high-strength airtight material with a smooth surface and good airtightness, so that it can be used to prepare products with high strength requirements, such as capstone airbags.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: a method for preparing a high-strength, airtight material is provided, comprising the following steps:

[0005] S1. Apply paste to both sides of the high-strength mesh and then dry it to obtain the paste-coated high-strength mesh.

[0006] S2. Preheat the high-strength mesh fabric, face film, and base film, and then attach the preheated face film and base film to both sides of the preheated high-strength mesh fabric.

[0007] The preheating temperature for applying the high-strength mesh is 176–192℃, and the bonding temperature is 166–178℃. The preheating temperature for applying the high-strength mesh is higher than the bonding temperature.

[0008] The beneficial effects of this invention are as follows: The method for preparing the high-strength airtight material provided by this invention uses a high preheating temperature for the mesh fabric to soften the dried and plasticized paste on the surface of the polyester mesh fabric, achieving the effect of preventing air from being trapped during lamination and degassing; at the same time, it uses a lower lamination temperature to avoid the problem of air bubbles being generated again by expansion. No air bubbles are generated during the entire lamination process, and the peel strength and tear strength of the product are improved. The resulting high-strength airtight material has a smooth surface, is free of air bubbles and pores, and has good physical properties. Attached Figure Description

[0009] Figure 1 The image shown is a photograph of a high-strength, airtight material according to an embodiment of the present invention.

[0010] Figure 2 The image shown is a photograph of a high-strength, airtight material according to a specific embodiment of the present invention.

[0011] Figure 3 The diagram shown is a cross-sectional view of the mesh gluing machine according to a specific embodiment of the present invention.

[0012] Label Explanation:

[0013] 1. Glue tank; 2. Upper glue roller assembly; 21. Upper glue roller; 3. Press roller assembly; 31. Press roller; 4. Guide roller. Detailed Implementation

[0014] To explain in detail the technical content, objectives, and effects of the present invention, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0015] A method for preparing a high-strength, airtight material includes the following steps:

[0016] S1. Apply paste to both sides of the high-strength mesh and then dry it to obtain the paste-coated high-strength mesh.

[0017] S2. Preheat the high-strength mesh fabric, face film, and base film, and then attach the preheated face film and base film to both sides of the preheated high-strength mesh fabric.

[0018] The preheating temperature for applying the high-strength mesh is 176–192℃, and the bonding temperature is 166–178℃. The preheating temperature for applying the high-strength mesh is higher than the bonding temperature.

[0019] The preferred temperature for preheating the high-strength mesh fabric is 180-190℃, more preferably 190℃. In specific embodiments, the preheating temperature for the high-strength mesh fabric can be 178℃, 179℃, 180℃, 181℃, 182℃, 183℃, 184℃, 186℃, 187℃, or 188℃.

[0020] The bonding temperature is preferably 171-176℃, more preferably 173℃, and in specific embodiments the bonding temperature can be 167℃, 168℃, 169℃, 170℃, 172℃, 174℃, 175℃, 177℃, or 178℃.

[0021] As can be seen from the above description, the beneficial effects of this invention are as follows: Compared with general mesh fabric lamination, by increasing the preheating temperature of the mesh fabric and decreasing the lamination temperature, it ensures that air bubbles are expelled while preventing the generation of new air bubbles, thus eliminating the problem of uneven lamination and air bubbles during the entire lamination process. The resulting product has good airtightness, tear resistance, and peel resistance, and has a smooth surface without air bubbles or pores.

[0022] Furthermore, the high-strength mesh is a high-strength polyester fiber mesh woven from 6000D to 12000D yarn. This yarn has high strength, and the tensile strength of the mesh woven from it can reach 8000N / 5CM to 20000N / 5CM.

[0023] Furthermore, the amount of paste applied is 300-350 gsm. In specific embodiments, it can be 310 gsm, 320 gsm, 330 gsm, or 340 gsm.

[0024] As described above, the inventors discovered that mesh fabric woven from high-fiber yarns is too coarse and dense. This results in an uneven surface and difficulty for the adhesive to penetrate the mesh, leading to an increased adhesive application rate. Consequently, a large number of air bubbles remain on the mesh surface, causing surface air bubbles and pits during final lamination. Therefore, it is necessary to reduce the adhesive application rate. Under suitable conditions, a smooth, air bubble-free lamination can be achieved within the above-mentioned range. Slightly higher or lower application rates within this range will not affect the smoothness of the lamination and can be adjusted according to the required product weight.

[0025] Furthermore, a mesh fabric pasting machine is used for pasting;

[0026] The mesh fabric gluing machine includes a glue tank 1, a gluing roller group 2, and a counter-pressure roller group 3; the gluing roller group 2 is located at the bottom of the glue tank 1, and the counter-pressure roller group 3 is located at the opening of the glue tank 1.

[0027] Furthermore, there are two sets of pressure rollers 3. Each set of pressure rollers 3 includes two pressure rollers 31 located on the same horizontal plane and axially parallel to each other; the distance between the two pressure rollers 31 is adjustable.

[0028] Furthermore, the paste roller assembly 2 includes at least three paste rollers 21 arranged side by side.

[0029] Currently, commonly used gluing equipment struggles to control the gluing amount below 400 gsm when applied to mesh fabrics woven from high-density yarns (6000D-12000D), resulting in persistent problems with air bubbles and pinholes. Through improvements to the overall structure of the gluing machine, a mesh fabric gluing machine with a wider and more precise control range for gluing amount has been developed. This allows the gluing amount to be controlled below 400 gsm when applying gluing to mesh fabrics woven from high-density yarns (6000D-12000D), and can even reach 300-350 gsm, thus overcoming the problem of surface air bubbles and pinholes.

[0030] Further, the temperature of the preheated face mask and base film is 150–170°C. Preferably, the temperature of the preheated face mask is higher than the temperature of the preheated base film. In specific embodiments, the temperatures of the preheated face mask and base film can be 150°C, 151°C, 153°C, 154°C, 156°C, 157°C, 158°C, 159°C, 161°C, 162°C, 164°C, 166°C, 167°C, 168°C, or 169°C.

[0031] Furthermore, the method includes the step of: S0, ironing the high-strength mesh fabric at a temperature less than 100°C, preferably 70-100°C, and more preferably 80-100°C. In specific embodiments, the ironing temperature can be 72°C, 75°C, 81°C, 84°C, 85°C, 89°C, 90°C, 92°C, 93°C, 94°C, 95°C, 96°C, 97°C, 98°C, or 99°C.

[0032] Furthermore, the ironing process involves three ironing rollers. Specifically, the fabric is passed sequentially through three ironing rollers, with the temperature difference between the three rollers being less than 5°C, preferably less than 2°C. Ideally, the temperatures of the three ironing rollers should be identical; however, in actual control, due to the influence of the surrounding environment, it is difficult to ensure that the three rollers are completely identical, and the temperature difference between them should be minimized.

[0033] Furthermore, the drying in S1 is a two-stage drying process, with the drying temperature of the first stage being lower than that of the second stage. Preferably, the temperature difference between the first and second stages is 4–10°C, more preferably 4–6°C. The drying temperatures of the first and second stages are 164–174°C. Using a two-stage drying process where the second stage temperature is lower than the first stage helps to further avoid the generation of a small number of bubbles during the drying process.

[0034] The following examples and comparative examples all use paste application. Figure 3 The fabric gluing machine shown is used for gluing;

[0035] The mesh fabric gluing machine includes a glue tank 1, a gluing roller group 2, two sets of counter-pressure roller groups 3, and a guide roller 4; the gluing roller group 2 is located at the bottom of the glue tank 1, and the counter-pressure roller group 3 is located at the opening of the glue tank 1.

[0036] Two sets of pressure roller groups 3 are arranged sequentially from top to bottom. The pressure roller group 3 includes two pressure rollers 31 located on the same horizontal plane and parallel to each other in the axial direction; the upper paste roller group 2 includes three upper paste rollers 21 arranged side by side.

[0037] When applying the paste, the glue tank is filled with paste, which completely submerges the pressure roller 31. The mesh is pulled by the guide roller 4 and passes around the three pressure rollers 31 in sequence to achieve the application of paste. Then it passes through two sets of pressure roller groups 3 in sequence. When passing through the pressure roller groups 3, it passes between the two pressure rollers 31. The excess paste is squeezed out by the pressure rollers 31, thus achieving precise control of the amount of paste applied.

[0038] Example 1:

[0039] A method for preparing a high-strength, airtight material includes the following steps:

[0040] S0. Iron the high-strength mesh fabric. Ironing is done by passing the mesh fabric through three ironing rollers in sequence. The temperatures of the three ironing rollers are 86℃, 88℃, and 87℃, respectively.

[0041] S1. Apply paste to both sides of the high-strength mesh fabric with a paste amount of 326gsm, and then dry it to obtain the paste-coated high-strength mesh fabric; the drying process is to pass it through two vertical dryers in sequence, with the temperature of the first vertical dryer being 168℃ and the temperature of the second vertical dryer being 173℃.

[0042] S2. Preheat the high-strength mesh fabric, the face film, and the bottom film using preheating rollers respectively. The temperature of the preheating roller for the high-strength mesh fabric is 190℃, the temperature of the preheating roller for the face film is 165℃, and the temperature of the preheating roller for the bottom film is 155℃.

[0043] S3. The preheated face film, the preheated high-strength mesh fabric, and the preheated base film are simultaneously sent to the lamination cylinder (hot roller) at 171°C to laminate the preheated face film and base film onto both sides of the preheated high-strength mesh fabric.

[0044] S4. After embossing, cooling, and winding, a high-strength and airtight material is obtained.

[0045] The high-strength, airtight material obtained in Example 1 is shown in [reference needed]. Figure 1 As shown, the material surface is smooth and flat, without bubbles or pores.

[0046] Example 2:

[0047] A method for preparing a high-strength, airtight material includes the following steps:

[0048] S0. Iron the high-strength mesh fabric. Ironing is done by passing the mesh fabric through three ironing rollers in sequence. The temperatures of the three ironing rollers are 80℃, 83℃, and 82℃, respectively.

[0049] S1. Apply paste to both sides of the high-strength mesh fabric with a paste amount of 349 gsm, and then dry it to obtain the paste-coated high-strength mesh fabric. The drying process involves passing the fabric through two vertical dryers in sequence. The temperature of the first vertical dryer is 170℃, and the temperature of the second vertical dryer is 174℃.

[0050] S2. Preheat the high-strength mesh fabric, the face film, and the bottom film using preheating rollers respectively. The temperature of the preheating roller for the high-strength mesh fabric is 185℃, the temperature of the preheating roller for the face film is 170℃, and the temperature of the preheating roller for the bottom film is 163℃.

[0051] S3. The preheated face film, the preheated high-strength mesh fabric, and the preheated base film are simultaneously sent to the lamination cylinder (hot roller) at 176°C to laminate the preheated face film and base film onto both sides of the preheated high-strength mesh fabric.

[0052] S4. After embossing, cooling, and winding, a high-strength and airtight material is obtained.

[0053] Example 3:

[0054] A method for preparing a high-strength, airtight material includes the following steps:

[0055] S0. Iron the high-strength mesh fabric. Ironing is done by passing the mesh fabric through three ironing rollers in sequence. The temperatures of the three ironing rollers are 90℃, 91℃, and 91℃, respectively.

[0056] S1. Apply paste to both sides of the high-strength mesh fabric with a paste amount of 311 gsm, and then dry it to obtain the paste-coated high-strength mesh fabric. The drying process involves passing the fabric through two vertical dryers in sequence. The temperature of the first vertical dryer is 169℃, and the temperature of the second vertical dryer is 175℃.

[0057] S2. Preheat the high-strength mesh fabric, the face film, and the bottom film using preheating rollers respectively. The temperature of the preheating roller for the high-strength mesh fabric is 176℃, the temperature of the preheating roller for the face film is 160℃, and the temperature of the preheating roller for the bottom film is 152℃.

[0058] S3. The preheated face film, the preheated high-strength mesh fabric, and the preheated base film are simultaneously sent to the lamination cylinder (hot roller) at 173°C, where the preheated face film and base film are laminated to both sides of the preheated high-strength mesh fabric.

[0059] S4. After embossing, cooling, and winding, a high-strength and airtight material is obtained.

[0060] Comparative Example 1:

[0061] A method for preparing a high-strength, airtight material includes the following steps:

[0062] S0. Iron the high-strength mesh fabric. Ironing is done by passing the mesh fabric through three ironing rollers in sequence. The temperatures of the three ironing rollers are 112℃, 113℃, and 111℃, respectively.

[0063] S1. Apply paste to both sides of the high-strength mesh fabric with a paste amount of 328gsm, and then dry it to obtain the paste-coated high-strength mesh fabric. The drying process involves passing the fabric through two vertical dryers in sequence. The temperature of the first vertical dryer is 168℃, and the temperature of the second vertical dryer is 173℃.

[0064] S2. Preheat the high-strength mesh fabric, the face film, and the bottom film using preheating rollers respectively. The temperature of the preheating roller for the high-strength mesh fabric is 190℃, the temperature of the preheating roller for the face film is 165℃, and the temperature of the preheating roller for the bottom film is 155℃.

[0065] S3. The preheated face film, the preheated high-strength mesh fabric, and the preheated base film are simultaneously sent to the lamination cylinder (hot roller) at 171°C to laminate the preheated face film and base film onto both sides of the preheated high-strength mesh fabric.

[0066] S4. After embossing, cooling, and winding, a high-strength and airtight material is obtained.

[0067] Comparative Example 2:

[0068] A method for preparing a high-strength, airtight material includes the following steps:

[0069] S0. Iron the high-strength mesh fabric. Ironing is done by passing the mesh fabric through three ironing rollers in sequence. The temperatures of the three ironing rollers are 86℃, 88℃, and 87℃, respectively.

[0070] S1. Apply paste to both sides of the high-strength mesh fabric with a paste amount of 431 gsm, and then dry it to obtain the paste-coated high-strength mesh fabric. The drying process involves passing the fabric through two vertical dryers in sequence. The temperature of the first vertical dryer is 168℃, and the temperature of the second vertical dryer is 173℃.

[0071] S2. Preheat the high-strength mesh fabric, the face film, and the bottom film using preheating rollers respectively. The temperature of the preheating roller for the high-strength mesh fabric is 190℃, the temperature of the preheating roller for the face film is 165℃, and the temperature of the preheating roller for the bottom film is 155℃.

[0072] S3. The preheated face film, the preheated high-strength mesh fabric, and the preheated base film are simultaneously sent to the lamination cylinder (hot roller) at 171°C to laminate the preheated face film and base film onto both sides of the preheated high-strength mesh fabric.

[0073] S4. After embossing, cooling, and winding, a high-strength and airtight material is obtained.

[0074] The high-strength, airtight material obtained in Comparative Example 2 is shown below. Figure 2As shown, Figure 2 The locations of the air bubbles and pores are circled in red, showing that the material surface has a large number of air bubbles and pores.

[0075] Comparative Example 3:

[0076] A method for preparing a high-strength, airtight material includes the following steps:

[0077] S0. Iron the high-strength mesh fabric. Ironing is done by passing the mesh fabric through three ironing rollers in sequence. The temperatures of the three ironing rollers are 86℃, 88℃, and 87℃, respectively.

[0078] S1. Apply paste to both sides of the high-strength mesh fabric with a paste amount of 324 gsm, and then dry it to obtain the paste-coated high-strength mesh fabric. The drying process involves passing the fabric through two vertical dryers in sequence. The temperature of the first vertical dryer is 168℃, and the temperature of the second vertical dryer is 173℃.

[0079] S2. Preheat the high-strength mesh fabric, the face film, and the bottom film using preheating rollers respectively. The temperature of the preheating roller for the high-strength mesh fabric is 190℃, the temperature of the preheating roller for the face film is 165℃, and the temperature of the preheating roller for the bottom film is 155℃.

[0080] S3. The preheated face film, the preheated high-strength mesh fabric, and the preheated base film are simultaneously sent to the lamination cylinder (hot roller) at 181°C to laminate the preheated face film and base film onto both sides of the preheated high-strength mesh fabric.

[0081] S4. After embossing, cooling, and winding, a high-strength and airtight material is obtained.

[0082] Comparative Example 4:

[0083] A method for preparing a high-strength, airtight material includes the following steps:

[0084] S0. Iron the high-strength mesh fabric. Ironing is done by passing the mesh fabric through three ironing rollers in sequence. The temperatures of the three ironing rollers are 86℃, 88℃, and 87℃, respectively.

[0085] S1. Apply paste to both sides of the high-strength mesh fabric, with a paste amount of 320gsm, and then dry it to obtain the paste-coated high-strength mesh fabric; the drying process is to pass it through two vertical dryers in sequence, with the temperature of the first vertical dryer being 168℃ and the temperature of the second vertical dryer being 173℃.

[0086] S2. Preheat the high-strength mesh fabric, the face film, and the bottom film using preheating rollers respectively. The temperature of the preheating roller for the high-strength mesh fabric is 160℃, the temperature of the preheating roller for the face film is 165℃, and the temperature of the preheating roller for the bottom film is 155℃.

[0087] S3. The preheated face film, the preheated high-strength mesh fabric, and the preheated base film are simultaneously sent to the lamination cylinder (hot roller) at 171°C to laminate the preheated face film and base film onto both sides of the preheated high-strength mesh fabric.

[0088] S4. After embossing, cooling, and winding, a high-strength and airtight material is obtained.

[0089] The pastes used in Examples 1-3 and Comparative Examples 1-4 were exactly the same.

[0090] The physical properties of the 10500D high-strength airtight materials obtained in Example 1 and Comparative Examples 1-4 were tested, and the results are shown in Table 1. The testing standards for thickness and basis weight were DIN EN ISO 2286-2; tensile strength was tested according to ISO 1421:2016 Method 1; peel strength was tested according to ISO 2411; and tear strength was tested according to GB / T 16578.

[0091] Table 1

[0092]

[0093]

[0094] It can be seen that by using high ironing temperature, controlling the amount of paste with a new paste applicator, and combining it with lower bonding temperature and higher preheating temperature, the problem of air bubbles and pores in the finished product can be significantly improved. At the same time, the peel strength and tear strength of the product can be further improved, making it more airtight and durable.

[0095] In summary, the high-strength, airtight material obtained by the preparation method provided by this invention has a smooth surface without bubbles, and its physical properties include a warp tensile strength of up to 16200 N / 5 cm, a weft tensile strength of up to 17500 N / 5 cm, a surface peel strength of up to 505 N / 5 cm, a bottom peel strength of up to 530 N / 5 cm, and a tear strength of 4618 N in the warp and 5134 N in the weft, meeting the physical property indicators.

[0096] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent modifications made based on the content of the present invention specification and drawings, or direct or indirect applications in related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A method for preparing a high-strength, airtight material, characterized in that, Includes the following steps: S0. Iron the high-strength mesh fabric flat at a temperature of less than 100℃. S1. Apply paste to both sides of the high-strength mesh fabric, with a paste amount of 300~350gsm, and then dry it to obtain the paste-coated high-strength mesh fabric; the high-strength mesh fabric is a polyester fiber mesh fabric woven from 6000D~12000D yarn. S2. Preheat the high-strength mesh fabric, face film, and base film, and then attach the preheated face film and base film to both sides of the preheated high-strength mesh fabric. The preheating temperature for applying the high-strength mesh is 176~192℃, and the bonding temperature is 166~178℃. The preheating temperature for applying the high-strength mesh is higher than the bonding temperature.

2. The method for preparing the high-strength, airtight material according to claim 1, characterized in that, A mesh fabric gluing machine is used for gluing; the mesh fabric gluing machine includes a glue tank, a gluing roller group and a counter-pressure roller group; the gluing roller group is located at the bottom of the glue tank, and the counter-pressure roller group is located at the opening of the glue tank.

3. The method for preparing the high-strength, airtight material according to claim 1, characterized in that, The temperature of the face mask and base mask is preheated to 150~170℃.

4. The method for preparing the high-strength, airtight material according to claim 1, characterized in that, The ironing process involves three irons.

5. The method for preparing the high-strength, airtight material according to claim 1, characterized in that, The drying process in S1 is a two-stage drying process, with the drying temperature of the first stage being lower than that of the second stage.

6. The method for preparing the high-strength, airtight material according to claim 5, characterized in that, The temperature difference between the drying temperature of the first stage and the drying temperature of the second stage is 5~10℃.

7. A high-strength, airtight material prepared by the preparation method according to any one of claims 1 to 6.

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