Non-woven fabric composite TPU film

Abstract

The utility model provides a non-woven fabric composite TPU (thermoplastic polyurethane) film. The non-woven fabric composite TPU film comprises an upper non-woven fabric layer, a film layer and a lower non-woven fabric layer, the thin film layer is provided with grid lines; the grid lines are formed by repeating units which are regularly arranged and of which the single surfaces are convex; the raw material of the film layer comprises thermoplastic polyurethane; the thickness ratio of the upper non-woven fabric layer to the thin film layer is (3-5): 1; the thickness ratio of the lower non-woven fabric layer to the thin film layer is (3-5): 1; the total thickness of the non-woven fabric composite TPU thin film ranges from 0.50 mm to 0.60 mm. Compared with the prior art, the non-woven fabric composite TPU film provided by the utility model has the advantage of obviously improving the abnormal sound condition of a product, is excellent in flame retardance, ventilation property and mechanical property, low in cost, safe and environment-friendly, has higher market application value, and particularly has extremely wide application in the field of automobile waist supports.

Description

Technical Field

[0001] The utility model relates to the field of thermoplastic polyurethane plastics, in particular to a non-woven fabric composite TPU film. Background Art

[0002] Thermoplastic polyurethane (TPU) is a new multifunctional polymer material with a main chain containing a repeating structural unit of carbamate group (-NH-COO-). For TPU, it can be heated and plasticized. It rarely crosslinks in chemical structure and the molecules are basically linear, but there is a certain amount of physical crosslinking. It is a linear block polymer formed by alternating soft and hard segments, with good mechanical properties and environmental resistance. Among them, polyether TPU has good hydrolysis resistance and is widely used in the automotive field. With the replacement of automotive interior materials, consumers also have higher requirements for the comfort of automotive interiors. However, during use, the car backrest will produce abnormal noise due to friction, and this problem still needs to be solved urgently. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a non-woven composite TPU film in order to overcome the defects of the prior art. The non-woven composite TPU film provided by the utility model has the advantage of being able to significantly improve the abnormal sound of the product, and has excellent flame retardancy, ventilation and air permeability and mechanical properties. At the same time, it is low in cost, safe and environmentally friendly, and has a high market application value, especially in the field of automotive lumbar support. It has extremely wide applications.

[0004] The utility model solves the above technical problems through the following technical solutions:

[0005] The utility model provides a non-woven fabric composite TPU film, the non-woven fabric composite TPU film comprises an upper non-woven fabric layer, a film layer and a lower non-woven fabric layer;

[0006] The film layer has a grid pattern; the grid pattern is formed by regularly arranged, single-sided protruding repeating units;

[0007] The raw material of the film layer includes thermoplastic polyurethane;

[0008] The thickness ratio of the upper non-woven fabric layer to the film layer is (3-5):1;

[0009] The thickness ratio of the lower non-woven fabric layer to the film layer is (3-5):1;

[0010] The total thickness of the non-woven fabric composite TPU film is 0.50-0.60 mm.

[0011] In some preferred embodiments, the bottom surface of the repeating unit is a square.

[0012] In some more preferred embodiments, the side length of the square is 15 - 30 μm.

[0013] In some further preferred embodiments, the side length of the square is 20 μm.

[0014] In some preferred embodiments, the height of the single-sided protrusion of the repeating unit is 5 - 10 μm; the spacing between the repeating units is 1 - 3 μm.

[0015] In some more preferred embodiments, the height of the single-sided protrusion of the repeating unit is 5 μm; the spacing between the repeating units is 1 μm.

[0016] In some preferred embodiments, the thermoplastic polyurethane includes 65A polyether-based polyurethane or 80A polyester-based polyurethane.

[0017] In some preferred embodiments, the upper non-woven fabric layer and the lower non-woven fabric layer are each independently one of spunlace non-woven fabric, needle-punched non-woven fabric, and TPU melt-blown non-woven fabric.

[0018] In some more preferred embodiments, both the upper non-woven fabric layer and the lower non-woven fabric layer are spunlace non-woven fabrics.

[0019] In some preferred embodiments, the upper non-woven fabric layer and the lower non-woven fabric layer are the same; there is an adhesive layer between the upper non-woven fabric layer and the film layer; there is an adhesive layer between the lower non-woven fabric layer and the film layer.

[0020] In some more preferred embodiments, the raw material of the adhesive layer includes water-based acrylic glue.

[0021] In some preferred embodiments, the total thickness of the non-woven fabric composite TPU film is 0.55 mm; among them, the thickness of the film layer is 0.05 mm; the thickness of the upper non-woven fabric layer is 0.25 mm; the thickness of the lower non-woven fabric layer is 0.25 mm.

[0022] In the present utility model, first, compared with traditional pure TPU, the non-woven fabric composite TPU film has significantly reduced thickness cost; second, the grid pattern of the film layer therein depends on the pattern of the rubber roller. By selecting a rubber roller with a designed pattern and subjecting it to counter-pressure, a neat and regular film layer can be obtained. The regularity of the film layer at the microscopic level enables the product non-woven fabric composite TPU film to exhibit relatively excellent performance.

[0023] The positive and progressive effects of the present utility model are as follows:

[0024] The non-woven fabric composite TPU film provided by the present utility model has the advantage of being able to significantly improve the abnormal sound of the product, and it has excellent flame retardancy, ventilation and air permeability, and mechanical properties. At the same time, it has low cost, is safe and environmentally friendly, and has high market application value, especially in the field of automotive lumbar supports, where it has extremely wide applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 FIG. is a schematic structural diagram of the non-woven fabric composite TPU film of Embodiment 1 of the present utility model.

[0026] Figure 2 FIG. is a top view schematic diagram of the film layer of the non-woven fabric composite TPU film of Embodiment 1 of the present utility model.

[0027] Figure 3 FIG. is a front view schematic diagram of the film layer of the non-woven fabric composite TPU film of Embodiment 1 of the present utility model.

[0028] DESCRIPTION OF THE REFERENCE NUMERALS:

[0029] Upper non-woven fabric layer 1

[0030] Film layer 2

[0031] Lower non-woven fabric layer 3 DETAILED DESCRIPTION OF THE EMBODIMENTS

[0032] The following is a preferred embodiment, and the present utility model will be described more clearly and completely in conjunction with the accompanying drawings.

[0033] Embodiment 1

[0034] As Figures 1-3 shown, this embodiment provides a non-woven fabric composite TPU film, which includes an upper non-woven fabric layer 1, a film layer 2, and a lower non-woven fabric layer 3;

[0035] In this embodiment, the film layer 2 has a grid pattern; the grid pattern is formed by regularly arranged and single-sided protruding repeating units; the bottom surface of the repeating unit is a square; the side length of the square is 20 μm; the height of the single-sided protrusion of the repeating unit is 5 μm; the spacing between the repeating units is 1 μm.

[0036] In this embodiment, the total thickness of the non-woven fabric composite TPU film is 0.55 mm; among them, the thickness of the film layer 2 is 0.05 mm; the thickness of the upper non-woven fabric layer 1 is 0.25 mm; the thickness of the lower non-woven fabric layer 3 is 0.25 mm.

[0037] In this embodiment, the raw material of the film layer 2 is 65A polyether type polyurethane (model BSF-1165A13WU).

[0038] In this embodiment, both the upper non-woven fabric layer 1 and the lower non-woven fabric layer 3 are spunlace non-woven fabrics.

[0039] In this embodiment, the upper non-woven fabric layer 1 is the same as the lower non-woven fabric layer 3; an adhesive layer is provided between the upper non-woven fabric layer 1 and the film layer 2; an adhesive layer is provided between the lower non-woven fabric layer 3 and the film layer 2.

[0040] In this embodiment, the raw material of the adhesive layer is water-based acrylic glue.

[0041] The preparation process of the non-woven fabric composite TPU film provided in this embodiment is as follows:

[0042] (1) First, fully dry the raw material of the film layer 2, then add it to the extruder for melting, and co-extrude and cast it through the die head to form a thermoplastic polyurethane film; the grid pattern of the thermoplastic polyurethane film is formed under the extrusion of the middle roller, and the middle roller is a special mesh structure rubber roller.

[0043] (2) Take the spunlace non-woven fabric that has been covered with a layer of water-based acrylic glue for interlayer bonding. First, wind the elastic spunlace non-woven fabric on the upper and lower unwinders of the casting machine. Before entering the slit between the front roller and the middle roller, open the two rollers a certain distance, place the spunlace non-woven fabric inside the two rollers, then reduce the roller distance. The thermoplastic polyurethane film is wound on the uppermost unwinder. Subsequently, the upper and lower layers of spunlace non-woven fabric are bonded to the thermoplastic polyurethane film through online attachment. The front roller and the middle roller are pressed against each other, and after cooling and forming, the non-woven fabric composite TPU film is obtained, and finally it is wound up.

[0044] Example 2

[0045] In this embodiment, the raw material of the film layer 2 is 80A polyester-based polyurethane (model HF-3H80AL-1).

[0046] Other conditions are the same as those in Example 1.

[0047] Comparative Example 1

[0048] Except that the film layer 2 is not provided with a grid pattern, other conditions are the same as those in Example 1.

[0049] Comparative Example 2

[0050] Except that the film layer 2 is not provided with a grid pattern, other conditions are the same as those in Example 2.

[0051] Effect Example 1

[0052] Friction abnormal sound test

[0053] (1) Test method

[0054] The utility model conducts friction tests on the products of Examples 1-2 and Comparative Examples 1-2 according to the test standard GB 10006-88. The two identical test surfaces are placed flat together, and under a certain contact pressure, the two surfaces are relatively moved, and noise signals are collected during this process. Specifically: the test surface of one specimen is upward and fixed flat on the horizontal test bench, and the length direction of the specimen is parallel to that of the test bench. The test surface of the other specimen is downward, covering the slider, and the upper specimen is fixed with ordinary double-sided tape. A fixed force value of 10 N is given to the slider, and it slides relatively at a speed of 100 mm / min. At the same time, a decibel meter is used to record the decibel value and loudness value during the process.

[0055] Test instruments: BSWA Prestige 308 decibel meter of Beijing Hengchuang Bomo Electronics Technology Co., Ltd., and friction coefficient tester LY-239M.

[0056] (2) Test results

[0057] The test results are shown in Table 1.

[0058] Table 1

[0059] Number Temperature (°C) Humidity (R.H.) Decibel value (dBA) N10 Loudness value (sone) Example 1 23 50 32.23 2.41 Example 2 23 50 34.67 3.02 Comparative Example 1 23 50 35.25 2.98 Comparative Example 2 23 50 37.19 3.26

[0060] As can be seen from Table 1, the decibel value and loudness value of Example 1 are lower than those of Comparative Example 1. At the same time, the decibel value and loudness value of Example 2 are lower than those of Comparative Example 2. This shows that the grid pattern set in the non-woven fabric composite TPU film provided by the utility model has the excellent effect of significantly reducing noise and improving abnormal noise.

Claims

1. A non-woven fabric composite TPU film, characterized in that: The non-woven fabric composite TPU film comprises an upper non-woven fabric layer, a film layer and a lower non-woven fabric layer; The film layer has a grid pattern; the grid pattern is formed by regularly arranged, single-sided protruding repeating units; The raw material of the film layer includes thermoplastic polyurethane; The thickness ratio of the upper non-woven fabric layer to the film layer is (3-5):1; The thickness ratio of the lower non-woven fabric layer to the film layer is (3-5):1; The total thickness of the non-woven fabric composite TPU film is 0.50-0.60 mm.

2. The non-woven fabric composite TPU film according to claim 1, characterized in that: The bottom surface of the repeating unit is a square.

3. The non-woven fabric composite TPU film according to claim 2, characterized in that: The side length of the square is 15 to 30 μm.

4. The non-woven fabric composite TPU film according to claim 3, characterized in that: The side length of the square is 20 μm.

5. The non-woven fabric composite TPU film according to claim 1, characterized in that: The height of the single-sided protrusion of the repeating unit is 5 to 10 μm; The spacing between the repeating units is 1 to 3 μm.

6. The non-woven fabric composite TPU film according to claim 5, characterized in that: The height of the single-sided protrusion of the repeating unit is 5 μm; The spacing between the repeating units is 1 μm.

7. The nonwoven composite TPU film according to claim 1, characterized in that: The thermoplastic polyurethane includes 65A polyether polyurethane or 80A polyester polyurethane.

8. The nonwoven fabric composite TPU film according to claim 1, characterized in that: The upper non-woven fabric layer and the lower non-woven fabric layer are independently one of spunlace non-woven fabric, needle-punched non-woven fabric and TPU melt-blown non-woven fabric.

9. The non-woven fabric composite TPU film according to claim 1, characterized in that: The upper nonwoven fabric layer is the same as the lower nonwoven fabric layer; An adhesive layer is provided between the upper non-woven fabric layer and the film layer; An adhesive layer is provided between the lower non-woven fabric layer and the film layer.

10. The non-woven fabric composite TPU film according to claim 1, characterized in that: The total thickness of the non-woven composite TPU film is 0.55 mm; wherein, The thickness of the film layer is 0.05 mm; The thickness of the upper non-woven fabric layer is 0.25 mm; The thickness of the lower non-woven fabric layer is 0.25 mm.

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