A high airtight space composite material and its preparation method

Abstract

This invention relates to the field of space fabric structure technology, specifically to a high airtightness space composite material and its preparation method. The preparation method includes the following steps: applying paste to both sides of an intermediate film; attaching two intermediate films to both sides of the space fabric; and then attaching a preheated face film and a bottom film to the two intermediate films; the width of the face film and the bottom film is greater than the width of the intermediate film. This invention's preparation method, without reducing the original basis weight, uses two layers of film, avoiding the semi-perforation abnormalities caused by air spots resulting from calendering and thick film production, thus reducing the risk of air leakage in subsequent finished products. The fact that the width of the face film and the bottom film is greater than the width of the intermediate film allows for complete coverage of the paste-coated intermediate film, preventing the heated paste from overflowing from the edges and adhering to the equipment after extrusion, thereby improving production efficiency and yield.

Description

Technical Field

[0001] This invention relates to the field of space fabric structure technology, specifically to a high airtight space composite material and its preparation method. Background Technology

[0002] The structure of the space fabric includes a top-layer film, a wire mesh fabric (space fabric), and a bottom film layer stacked sequentially from top to bottom. The top and bottom film layers improve the wear resistance and bending resistance of the space fabric surface. Chinese invention patent CN105666963A discloses a method for preparing a wire mesh fabric composite material. It involves mixing diisononyl phthalate or dioctyl phthalate with polyvinyl chloride and a stabilizer to form a coating agent. The coating agent is then applied to both sides of the wire mesh fabric. After plasticizing the coated wire mesh fabric, it is laminated with a PVC film to obtain a high-strength wire mesh fabric composite material. However, during lamination, the coating agent is easily extruded and contaminates the wire mesh fabric layer and the lamination equipment. This not only affects the quality of the space fabric but also reduces the peel strength at the edges, decreasing the usable width of the space fabric and causing it to fail to meet dimensional specifications after cutting, thus reducing product yield. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a spatial composite material that does not overflow at the edges during bonding and its preparation method, which can also avoid the airtightness problem caused by calendering and thick film forming.

[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 airtightness space composite material, comprising the following steps: applying paste to both sides of the middle film, attaching the two middle films to both sides of the space fabric respectively, and then attaching the preheated face film and bottom film to the two middle films respectively.

[0005] The width of both the face mask and the base mask is greater than the width of the middle mask.

[0006] Another technical solution adopted in this invention is: a high airtight space composite material prepared by the above-mentioned method for preparing high airtight space composite materials.

[0007] The beneficial effects of this invention are as follows: The preparation method of this invention sets the width of both the top and bottom films to be greater than the width of the middle film, which can completely cover the paste-coated middle film, preventing the paste from overflowing from the edges and adhering to the equipment after being squeezed out when heated, thus improving production efficiency and yield. This invention, by using two layers of film without reducing the original basis weight, avoids the semi-perforation abnormalities caused by gas spots in thick calendered films, reducing the risk of air leakage in subsequent finished products. Attached Figure Description

[0008] Figure 1The diagram shown is a schematic diagram of the high airtightness space composite material of Embodiment 2 of the present invention;

[0009] Label Explanation:

[0010] 1. Face mask layer; 2. First intermediate film layer; 3. Spatial fabric; 4. Second intermediate film layer; 5. Base film layer; 6. Paste layer. Detailed Implementation

[0011] 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.

[0012] A method for preparing a high airtightness space composite material includes the following steps: applying paste to both sides of the middle film, attaching the two middle films to both sides of the space fabric respectively, and then attaching the preheated face film and bottom film to the two middle films respectively.

[0013] The width of both the face mask and the base mask is greater than the width of the middle mask.

[0014] As described above, the beneficial effects of this invention are as follows: The preparation method of this invention first involves pasting the middle film onto both sides and then laminating it with the space fabric. Then, the preheated top and bottom layers are laminated with the middle film. Traditionally, a single-layer calendered thick film is used for lamination. Calendered thick films are prone to air spot problems, which can easily transform into semi-perforations during lamination due to heat. Some semi-perforations are small or hidden and difficult to detect, increasing the risk of air leakage in the finished product. This invention, without reducing the original basis weight, uses a two-layer lamination method, avoiding the semi-perforation abnormalities caused by air spot problems from calendered thick films, thus reducing the risk of air leakage in subsequent finished products.

[0015] The width of both the face film and the base film is greater than that of the middle film, allowing for complete coverage of the pasted middle film. This prevents the paste from overflowing from the edges and adhering to the equipment during lamination of the face film and base film due to incomplete coverage. This avoids issues like material sticking, frayed edges, and the need for frequent machine stops for cleaning, thus improving production efficiency. It also avoids excessive cutting due to insufficient peel strength at the edges of the space fabric, ensuring that the usable space fabric meets dimensional specifications and increasing yield. Simultaneously, the surface film thickness remains largely unchanged, preserving the material's airtightness and abrasion resistance.

[0016] This invention uses a medium-film paste application method instead of the traditional space cloth paste application method, resulting in a softer composite product that is more suitable for the gymnastics mat field.

[0017] Applying paste to the middle film ensures peel strength and prevents insufficient peeling caused by small areas not being covered with paste or having too little paste, which can lead to delamination when the finished product is inflated.

[0018] Furthermore, the amount of batter applied during the coating process is 60–110 gsm.

[0019] Furthermore, the bonding temperature during the bonding of the middle film with the space fabric is 165–180℃, and the bonding pressure is 15–25 kg.

[0020] Furthermore, the preheating temperature of the face mask is 155–170°C.

[0021] Furthermore, the preheating temperature of the bottom film is 155–170°C.

[0022] Furthermore, the bonding temperature when the face mask and base film are bonded together with the middle film is 175-190℃, and the bonding pressure is 15-25kg.

[0023] As described above, the bonding temperature of the middle film when bonding to the space fabric is relatively low, which serves as a preheating effect, allowing the middle film containing the paste to bond with the mesh fabric. The bonding temperature of the middle film when bonding the front and back films is relatively high is because the bonding of the front and back film layers to the middle film requires pressure and high temperature after the aforementioned layer structures have softened.

[0024] Furthermore, the width of both the face mask and the base mask is 20-30 mm wider than the width of the middle mask.

[0025] As can be seen from the above description, if the width of the face mask and the first base film is too wide, the production cost will increase; if the width is too narrow, it will not be able to completely cover the squeezed paste.

[0026] Furthermore, the width of both the face mask and the base mask is smaller than the width of the space fabric.

[0027] As can be seen from the above description, setting the width of the top and bottom films to be smaller than the width of the space fabric can, on the one hand, prevent the film from sticking to the rollers after being heated, which would make cleaning the machine troublesome; on the other hand, if the width of the film is greater than the width of the space fabric, the bottom film will stick together after heat sealing, and the upper and lower mesh fabrics will be difficult to separate, thus failing to achieve the effect of a three-dimensional structure of the space composite material.

[0028] Furthermore, the width of both the face mask and the base mask is 20-40 mm narrower than the width of the space fabric.

[0029] Furthermore, the thickness of the middle film, the face film, and the base film is all less than 0.45 mm.

[0030] As can be seen from the above description, controlling the thickness of a single layer of membrane material to below 0.45mm reduces gas spots.

[0031] Another technical solution adopted in this invention is: a high airtight space composite material prepared by the above-mentioned method for preparing high airtight space composite materials.

[0032] Embodiment 1 of the present invention is: a method for preparing a high airtightness space composite material, comprising the following steps:

[0033] S1: Both sides of the middle membrane are coated with paste, and the amount of paste on both sides is 80gsm;

[0034] S2: Lay the two middle films onto both sides of the space fabric respectively, with a lamination temperature of 170℃ and a lamination pressure of 20kg;

[0035] S3: Preheat the face mask and base mask. The preheating temperature of the face mask is 160℃, and the preheating temperature of the base mask is 160℃.

[0036] S4: The preheated face film and base film are respectively bonded to two middle films at a bonding temperature of 180℃ and a bonding pressure of 20kg to obtain a high airtight space composite material.

[0037] The face mask, middle mask, and bottom mask are all made of PVC (polyvinyl chloride), and the paste is PVC paste. The width of the fabric is 1920mm; the width of the face mask is 1880mm and the thickness is 0.40mm; the width of the middle mask is 1850mm and the thickness is 0.40mm; and the width of the bottom mask is 1870mm and the thickness is 0.40mm.

[0038] Please refer to Figure 1 The second embodiment of the present invention is as follows: the high airtightness space composite material prepared by the preparation method of the first embodiment includes a top film layer 1, a first middle film layer 2, a space cloth 3, a second middle film layer 4 and a bottom film layer 5, which are stacked in sequence from top to bottom with their center lines aligned. Both sides of the first middle film layer 2 and the second middle film layer 4 are provided with a paste layer 6.

[0039] Embodiment 3 of the present invention is: a method for preparing a high airtightness space composite material, comprising the following steps:

[0040] S1: Both sides of the middle membrane are coated with paste, and the amount of paste on both sides is 60gsm;

[0041] S2: Lay the two middle films onto both sides of the space fabric respectively, with a lamination temperature of 165℃ and a lamination pressure of 25kg;

[0042] S3: Preheat the face mask and base mask. The preheating temperature of the face mask is 155℃, and the preheating temperature of the base mask is 155℃.

[0043] S4: The preheated face film and base film are respectively bonded to the two middle films at a bonding temperature of 175℃ and a bonding pressure of 25kg to obtain a high airtight space composite material.

[0044] The face mask, middle mask, and bottom mask are all made of PVC (polyvinyl chloride), and the paste is PVC paste. The width of the fabric is 1920mm; the width of the face mask is 1880mm and the thickness is 0.30mm; the width of the middle mask is 1850mm and the thickness is 0.30mm; and the width of the bottom mask is 1870mm and the thickness is 0.30mm.

[0045] Embodiment four of the present invention is: a method for preparing a high airtightness space composite material, comprising the following steps:

[0046] S1: Both sides of the middle membrane are coated with paste, and the amount of paste on both sides is 110gsm;

[0047] S2: Lay the two middle films onto both sides of the space fabric respectively, with a lamination temperature of 180℃ and a lamination pressure of 15kg;

[0048] S3: Preheat the face mask and base mask. The preheating temperature of the face mask is 170℃, and the preheating temperature of the base mask is 170℃.

[0049] S4: The preheated face film and base film are respectively bonded to the two middle films at a bonding temperature of 190℃ and a bonding pressure of 15kg to obtain a high airtight space composite material.

[0050] The face mask, middle mask, and bottom mask are all made of PVC (polyvinyl chloride), and the paste is PVC paste. The width of the fabric is 1920mm; the width of the face mask is 1880mm and the thickness is 0.40mm; the width of the middle mask is 1850mm and the thickness is 0.40mm; and the width of the bottom mask is 1870mm and the thickness is 0.40mm.

[0051] In summary, the high airtightness space composite material and its preparation method provided by this invention have the following advantages:

[0052] 1. This invention replaces the original basis weight with a two-layer film, which avoids the semi-perforation abnormalities caused by air spots resulting from thick calendering film production, and reduces the risk of air leakage in subsequent finished products.

[0053] 2. The width of both the face film and the bottom film is greater than that of the middle film, which can completely cover the middle film that has been coated with paste. This prevents the paste from overflowing from the edges and adhering to the equipment (large cylinder) after being squeezed out when the film is applied, thus improving production efficiency and yield. At the same time, the thickness of the surface film layer is not significantly changed, so it does not affect the airtightness, wear resistance and other properties of the material.

[0054] 3. Apply paste to the middle film to standardize the paste coating area and improve the peel strength of the space fabric.

[0055] 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 of making a high-gas-barrier spatial composite material, characterized in that, It comprises the following steps: The two sides of the middle film are pasted with paste, and the two middle films are respectively attached to the two sides of the space cloth, and then the preheated surface film and the bottom film are respectively attached to the two middle films; The width of the surface film and the bottom film is greater than the width of the middle film; The width of the surface film and the bottom film is less than the width of the space cloth; The attachment temperature of the surface film and the bottom film to the middle film is 175-190℃, and the attachment pressure is 15-25kg; The material of the surface film, the middle film and the bottom film is PVC, and the paste is PVC paste.

2. The method of claim 1, wherein the high-gas-barrier space composite is prepared by a method comprising: The paste amount during pasting is 60-110gsm.

3. The method of claim 1, wherein the high-gas-barrier space composite is prepared by a method comprising: The attachment temperature of the middle film to the space cloth is 165-180℃, and the attachment pressure is 15-25kg.

4. The method of claim 1, wherein the high-gas-barrier space composite is prepared by a method comprising: The preheating temperature of the surface film is 155-170℃.

5. The method of claim 1, wherein the high-gas-barrier spatial composite is prepared by a process comprising: The preheating temperature of the bottom film is 155-170℃.

6. The method of claim 1, wherein the high-gas-barrier spatial composite is prepared by a process comprising: The width of the surface film and the bottom film is 20-30mm wider than the width of the middle film.

7. The method of claim 1, wherein the high-gas-barrier spatial composite is prepared by a process comprising: The width of the surface film and the bottom film is 20-40mm narrower than the width of the space cloth.

8. The high air-tightness space composite material prepared by the preparation method of any one of claims 1-7.

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