Automobile seat leather

Abstract

The utility model relates to an automobile seat leather, including base cloth layer, hot melt adhesive layer, crosslinking polyolefin layer and coating that stack in proper order, base cloth layer and crosslinking polyolefin layer are tightly adhered through hot adhesive layer, and the crosslinking degree of crosslinking polyolefin layer is greater than or equal to 30%, effectively solved the problem that crosslinking polyolefin layer and base cloth layer between adhesive force are low.

Description

Technical Field

[0001] This utility model relates to the field of automotive interiors, specifically to a type of automotive seat leather. Background Technology

[0002] With the development of the automotive industry, consumers' demands for in-car comfort are constantly increasing. Among these demands, the soft feel and wear resistance of car seat leather, as the area with the most interaction with the driver, are crucial. Meanwhile, against the backdrop of energy conservation, emission reduction, and improved fuel economy, lightweight design of various automotive components has become an ongoing goal pursued by the industry.

[0003] Polyolefin artificial leather is recognized by the market for its softness and environmental friendliness. However, due to the low polarity of polyolefin materials, it is difficult to bond with the base fabric. The peel strength between the two is usually less than 25N / 5cm. Utility Model Content

[0004] To address the problems existing in the prior art, this utility model provides an automotive seat leather, comprising a base fabric layer, a hot melt adhesive layer, a cross-linked polyolefin layer, and a coating layer stacked sequentially. The base fabric layer and the cross-linked polyolefin layer are tightly bonded together by the hot melt adhesive layer, and the degree of cross-linking of the cross-linked polyolefin layer is greater than or equal to 30%.

[0005] Furthermore, the thickness of the hot melt adhesive layer is between 5 micrometers and 50 micrometers.

[0006] Furthermore, the cross-linked polyolefin layer also includes a polyolefin adhesive layer that is closely attached to the hot melt adhesive layer.

[0007] Furthermore, the polyolefin adhesive layer contains a tackifying resin.

[0008] Furthermore, the cross-linked polyolefin layer is a blend of polyolefin elastomer and EPDM rubber.

[0009] Furthermore, the hot melt adhesive layer is selected from one of thermoplastic polyurethane, ethylene-vinyl acetate copolymer, polyolefin, and polyester.

[0010] Furthermore, the base fabric layer is one or more of the following: knitted fabric, ordinary nonwoven fabric, high-density nonwoven fabric, fiber-reinforced base fabric, woven fabric, microfiber fabric, jacquard fabric, with a thickness between 0.1 mm and 1.2 mm.

[0011] Furthermore, the base fabric layer also includes a foam layer.

[0012] Furthermore, the foam layer has a base yarn.

[0013] Furthermore, the automotive seat leather provided in this application has uniformly or non-uniformly distributed through holes, and the shape of the through holes can be one or more of the following: circular, elliptical, triangular, and regular polygonal.

[0014] The technical solution proposed in this application can solve the problem of poor adhesion between the cross-linked polyolefin layer and the base fabric layer, and the hot melt adhesive layer makes the peel strength between the base fabric layer and the polyolefin layer greater than 50N / 5cm.

[0015] An additional polyolefin adhesive layer is provided on the side where the cross-linked polyolefin layer and the hot melt adhesive layer are tightly bonded. An tackifying resin is added to the adhesive layer to further improve the peel strength between the base fabric layer and the polyolefin layer to greater than 60N / 5cm. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the leather layer structure of the car seat in Embodiment 1 of this utility model.

[0017] Figure 2 This is a schematic diagram of the leather layer structure of the car seat in Embodiment 2 of this utility model.

[0018] Figure 3 This is a schematic diagram of the leather layer structure of the car seat in Embodiment 3 of this utility model.

[0019] 100—Car seat leather;

[0020] 11 — Coating;

[0021] 12—Cross-linked polyolefin layer;

[0022] 121—Polyolefin adhesive layer;

[0023] 13 - Hot melt adhesive layer

[0024] 14—Base fabric layer;

[0025] 141 – Foam layer;

[0026] 142—Base yarn layer; Detailed Implementation

[0027] To make the objectives, technical solutions, and beneficial effects of this invention clearer, the invention will be described in detail below with reference to specific embodiments. It should be understood that the embodiments described in this specification are merely illustrative and not intended to limit the scope of the invention.

[0028] For simplicity, this paper only explicitly discloses some numerical ranges. However, any lower limit can be combined with any upper limit to form an undefined range; and any lower limit can be combined with other lower limits to form an undefined range, just as any upper limit can be combined with any other upper limit to form an undefined range. Furthermore, although not explicitly stated, every point or individual value between the endpoints of a range is included within that range. Therefore, each point or individual value can serve as its own lower or upper limit and be combined with any other point or individual value, or with other lower or upper limits, to form an undefined range.

[0029] In this description, it should be noted that, unless otherwise stated, "above" and "below" include the stated number, and "multiple" in "one or more" means two or more.

[0030] This utility model provides an automotive seat leather, comprising a base fabric layer, a hot melt adhesive layer, a cross-linked polyolefin layer, and a coating layer stacked sequentially.

[0031] In some embodiments, the polyolefin may be selected from one or more of polyethylene, ethylene-α-olefin copolymers, polypropylene, propylene-α-olefin copolymers, and ethylene propylene diene monomer (EPDM) rubber copolymers.

[0032] Polyolefin materials produce very little odorous volatile matter. Compared to solvent-based PU car seat leather and PVC car seat leather with added plasticizers, the resulting car seat leather has a lower odor and the production process has better environmental performance, thus meeting the requirements of occasions with higher odor and environmental protection requirements.

[0033] In some embodiments, the crosslinked polyolefin layer is a blend of a polyolefin elastomer and ethylene propylene diene monomer (EPDM) rubber. In some embodiments, the crosslinked polyolefin layer has a crosslinking degree of ≥30% and ≤80%. The polyolefin layer can be crosslinked by one or more of thermal crosslinking and radiation crosslinking; to achieve the target crosslinking degree, a peroxide crosslinking agent and a crosslinking aid containing reactive double bonds can be added to the polyolefin layer.

[0034] In some embodiments, the thickness of the cross-linked polyolefin layer is set between 0.2 mm and 1.2 mm, so that the entire covered leather has a good thickness ratio, which not only ensures the softness of the leather, but also improves its wear resistance, effectively solving the problem of insufficient softness of leather in the prior art.

[0035] In some embodiments, the cross-linked polyolefin layer further includes a polyolefin adhesive layer that adheres closely to the hot melt adhesive layer.

[0036] In some embodiments, the polyolefin adhesive layer further comprises a tackifying resin, with a blend of polyolefin and tackifying resin, or polyolefin and grafted polyolefin, as the substrate.

[0037] In some embodiments, the adhesive layer thickness is 10 micrometers to 300 micrometers.

[0038] In some embodiments, the hot melt adhesive layer is selected from thermoplastic polyurethane, ethylene-vinyl acetate copolymer, polyolefin, and polyester, and the thickness of the hot melt adhesive layer is between 5 micrometers and 50 micrometers.

[0039] In some embodiments, the base fabric layer is one or more of the following: knitted fabric, ordinary nonwoven fabric, high-density nonwoven fabric, fiber-reinforced base fabric, woven fabric, microfiber fabric, jacquard fabric, with a thickness between 0.1 mm and 1.2 mm.

[0040] In some embodiments, the base fabric layer further includes a foam layer disposed on the side of the base fabric layer away from the seat frame. The foam layer is made of at least one of polyolefin foam, polyurethane foam, or PVC foam, and its thickness is not limited, providing cushioning support.

[0041] In some embodiments, a base fabric layer covers the outside of the foam layer, and the base fabric layer has a thickness of 0.1 mm to 1.2 mm.

[0042] In some implementations, when the foam layer thickness is greater than 10 mm, a through-hole structure may be provided in the foam layer to improve the air permeability of the thick foam.

[0043] In some embodiments, the foam layer has a base yarn layer, preferably polyester, with a fiber diameter ranging from 8 to 15 μm, and the pore size is controlled to be ≤5 μm by electrospinning process: directly contacting the seat frame.

[0044] In some embodiments, the car seat leather has uniformly or non-uniformly distributed through holes, and the shape of the through holes can be one or more of the following: circular, elliptical, triangular, or regular polygonal.

[0045] In some implementations, a coating is applied to the outer surface of the cross-linked polyolefin layer, with a thickness of 2 to 20 micrometers, to optimize the tactile feel and provide surface abrasion resistance.

[0046] In some embodiments, the coating may be made of coating materials known in the art for leather, including one or more of polyurethane coatings, acrylic coatings, or silicone coatings. The coating typically has suitable abrasion resistance, gloss, and adhesion, and a thickness of 2 to 20 micrometers, which can be selected by those skilled in the art according to actual needs.

[0047] In some implementations, a plurality of vent holes are provided on one side of the coating surface, which are uniformly or non-uniformly distributed, and the vent holes penetrate the coating, the cross-linked polyolefin layer and the base fabric layer.

[0048] In some implementations, the vent is columnar, and its cross-section is one or more of the following: circular, elliptical, triangular, or regular polygonal.

[0049] Example

[0050] The following examples describe the disclosure of this invention in more detail. These examples are merely illustrative, as various modifications and variations will be apparent to those skilled in the art within the scope of this disclosure. Unless otherwise stated, all parts, percentages, and ratios reported in the following examples are based on weight, and the reagents and instruments used in the examples are commercially available.

[0051] Sample preparation:

[0052] Step 1: Lay the hot melt adhesive layer 13 and the base fabric layer 14;

[0053] Step 2: Preparation of polyolefin leather raw materials

[0054] The raw materials for the cross-linked polyolefin layer are as follows:

[0055] 70 parts of POE resin (LC565);

[0056] 30 parts of EPDM rubber (3032PM);

[0057] 0.5 parts benzoyl peroxide;

[0058] Step 3: Coating and Lamination

[0059] All raw materials of the cross-linked polyolefin layer are added to the coating machine and mixed thoroughly. The polyolefin layer is then coated onto the base fabric layer 14, which has been pre-layered with hot melt adhesive layer 13, at 120-150°C. The mixture is then cooled by cold rollers at a pressure of 5-10 MPa for 10-30 seconds.

[0060] Step 4: Crosslinking and Curing

[0061] The material is hot-pressed and cross-linked under conditions of 160℃ and 0.8MPa to form a composite layer consisting of a cross-linked polyolefin layer 12, a hot melt adhesive layer 13, and a base fabric layer 14.

[0062] Step 5: Coating and Cutting

[0063] PU resin is coated on the surface of the cross-linked polyolefin layer of the composite layer and cured in a 120°C oven to form coating 11.

[0064] Cut into a predetermined shape and then use a laser to drill holes.

[0065] Step 6: Composite foam layer

[0066] On the side of the base fabric layer facing away from the PU coating, a precisely controlled flame is used to instantly melt one side of the foam layer. The flame temperature is less than 1300℃. A hot press roller is used to press and cool the molten foam layer 141 and the bottom yarn layer 142 together to form a three-layer integrated composite structure without adhesive.

[0067] Performance testing:

[0068] Crosslinking degree: Tested by xylene extraction method as specified in GB / T29848-2018 "Ethylene-vinyl acetate copolymer (EVA) film for photovoltaic module encapsulation" (5.5.3).

[0069] Peel strength: Tested in accordance with GB / T 8808.

[0070] Example 1

[0071] Soft car seat cover structure such as Figure 1 As shown, where:

[0072] Coating 11 is a 5μm thick polyurethane; cross-linked polyolefin layer 12 is a 0.5mm thick copolymer of EPDM rubber and POE with a cross-linking degree of 30%; hot melt adhesive layer 13 is a 5-micron thick polyurethane hot melt adhesive; base fabric layer 14 is a 0.5mm thick woven fabric.

[0073] Example 2

[0074] The soft car seat cover structure in Example 2 is as follows: Figure 2 As shown, the difference from Example 1 is that the cross-linked polyolefin layer 12 is attached to one side of the hot melt adhesive layer and is provided with a polyolefin adhesive layer 121 by double-layer co-extrusion or hot composite technology. The polyolefin adhesive layer 121 is composed of 80 parts POE, 10 parts EPDM and 10 parts terpene resin.

[0075] Example 3

[0076] The structure of Example 3 is as follows Figure 3 As shown, the difference from Example 2 is that the base fabric layer 14 has a foam layer 141 and a bottom yarn layer 142 on the side facing away from the hot melt adhesive layer 13. The foam layer 141 is a 20mm thick polyolefin foam, and the bottom yarn layer 142 is a 10μm polyester electrospun mesh (4μm pore size) with a thickness of 0.03mm.

[0077] Example 4

[0078] The structure of Example 4 is as follows Figure 3 As shown, the difference between Example 4 and Example 3 is that the seat leather coating has circular ventilation holes with a diameter of 0.5 mm, evenly distributed at 50 holes / cm². 2 .

[0079] Finally, it should be noted that the above embodiments are only used to illustrate the embodiments of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the embodiments described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding embodiments to deviate from the scope of the embodiments of the present invention.

Claims

1. A type of automotive seat leather, characterized in that, It includes a base fabric layer, a hot melt adhesive layer, a cross-linked polyolefin layer and a coating layer stacked in sequence. The base fabric layer and the cross-linked polyolefin layer are tightly bonded together by the hot melt adhesive layer, and the degree of cross-linking of the cross-linked polyolefin layer is greater than or equal to 30%.

2. The automotive seat leather according to claim 1, characterized in that, The thickness of the hot melt adhesive layer is between 5 micrometers and 50 micrometers.

3. The automotive seat leather according to claim 1, characterized in that, The cross-linked polyolefin layer also includes a polyolefin adhesive layer that is closely attached to the hot melt adhesive layer.

4. The automotive seat leather according to claim 3, characterized in that, The polyolefin adhesive layer contains a tackifying resin.

5. The automotive seat leather according to claim 1, characterized in that, The cross-linked polyolefin layer is a blend of polyolefin elastomer and EPDM rubber.

6. The automotive seat leather according to claim 1, characterized in that, The hot melt adhesive layer is selected from one of thermoplastic polyurethane, ethylene-vinyl acetate copolymer, polyolefin, and polyester.

7. The automotive seat leather according to claim 1, characterized in that, The base fabric layer is one or more of the following: knitted fabric, ordinary nonwoven fabric, high-density nonwoven fabric, fiber-reinforced base fabric, woven fabric, microfiber fabric, and jacquard fabric, with a thickness between 0.1 mm and 1.2 mm.

8. The automotive seat leather according to claim 1, characterized in that, The base fabric layer also includes a foam layer.

9. The automotive seat leather according to claim 8, characterized in that, The foam layer has a base yarn.

10. The automotive seat leather according to claim 1, characterized in that, It has through holes that are uniformly or non-uniformly distributed, and the shape of the through holes can be one or more of the following: circular, elliptical, triangular, or regular polygonal.

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