Automobile armrest box covering leather

Abstract

The utility model relates to an automobile handrail box package leather, including base cloth layer, crosslinking polyolefin layer and coating that stack in proper order, the crosslinking degree of crosslinking polyolefin layer is greater than or equal to 30%, does not have plasticizer and other solvent, has realized automobile handrail box package leather low VOC, through the reasonable setting each layer structure, effectively solved the problem that polyolefin package leather abrasion resistance is poor.

Description

Technical Field

[0001] This utility model relates to the field of automotive interiors, specifically to a leather-covered armrest box for automobiles. Background Technology

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

[0003] PVC artificial leather has significant drawbacks in its application to automotive armrest boxes. Its molecular structure contains more than 30% chlorine and phthalate plasticizers, which release dioxins, a Group 1 carcinogen, when burned. PVC has poor low-temperature flexural strength, becoming brittle and cracking at -10℃. Plasticizers continue to leach out during use, potentially causing the surface to become sticky or staining light-colored clothing. Additionally, VOC emissions inside the vehicle may exceed standards over a long period. PVC has a cheap feel and a Shore hardness greater than 75HA.

[0004] PU artificial leather is divided into two types: solvent-based and water-based. Solvent-based PU has a VOC continuous volatilization problem similar to PVC, while water-based PU has reduced wear resistance and increased cost. Both types of PU artificial leather face the problem of hydrolytic aging and are prone to cracking and mildew in humid and hot environments.

[0005] Therefore, there is an urgent need to develop a new type of leather for car armrest boxes that can ensure the wear resistance and softness of the material, solve the problem of small molecule organic matter leaching, and also take into account the environmental protection and environmental friendliness of the material. Utility Model Content

[0006] To address the problems existing in the prior art, this utility model provides a leather-covered car armrest box, comprising a base fabric layer, a cross-linked polyolefin layer, and a coating layer stacked sequentially, wherein the degree of cross-linking of the cross-linked polyolefin layer is greater than or equal to 30%.

[0007] Furthermore, the thickness of the cross-linked polyolefin layer is between 0.2 mm and 1.2 mm.

[0008] Furthermore, the cross-linked polyolefin layer also includes a polyolefin adhesive layer that is closely attached to the base fabric layer.

[0009] 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, and microfiber fabric, with a thickness between 0.1 mm and 1.2 mm.

[0010] Furthermore, the base fabric layer also includes a foam layer with a thickness between 0.1 mm and 0.5 mm.

[0011] Furthermore, 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.

[0012] Furthermore, the coating thickness is between 3 micrometers and 20 micrometers.

[0013] Furthermore, TABER has a wear resistance of more than 3000 cycles.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] This invention uses a cross-linked polyolefin layer as an intermediate layer, which does not contain plasticizers or other solvents, ensuring low VOCs. By controlling the degree of cross-linking to be greater than or equal to 30%, the wear resistance of the material is significantly improved, making the coated leather more durable and extending its service life, effectively solving the problem of poor wear resistance of polyolefin coated leather.

[0016] This invention achieves a good thickness ratio for the entire covered leather by setting a cross-linked polyolefin layer thickness of 0.2 mm to 1.2 mm and a base fabric layer thickness of 0.1 mm to 1.2 mm, which ensures both the softness of the leather and its abrasion resistance.

[0017] This invention further improves the softness and comfort of leather by setting a foam layer in the base fabric layer with a thickness between 0.1 mm and 0.5 mm.

[0018] The cross-linked polyolefin layer of the present invention adopts a uniform or non-uniformly distributed through-pore design, which increases the breathability and softness of the leather while maintaining its strength. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the leather layer structure of the car armrest box in Embodiment 1 of this utility model.

[0020] Figure 2 This is a schematic diagram of the leather layer structure of the car armrest box in Embodiment 2 of this utility model.

[0021] Figure 3 This is a schematic diagram of the leather layer structure of the car armrest box in Embodiment 3 of this utility model.

[0022] 100 — Leather-covered car armrest box;

[0023] 11 — Coating;

[0024] 12—Cross-linked polyolefin layer;

[0025] 121—Polyolefin adhesive layer;

[0026] 13—Base fabric layer;

[0027] 131 – Foam layer; Detailed Implementation

[0028] 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.

[0029] For simplicity, this paper only explicitly discloses some numerical ranges. However, any lower limit can be combined with any upper limit to form an unspecified range; and any lower limit can be combined with other lower limits to form an unspecified range, just as any upper limit can be combined with any other upper limit to form an unspecified 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 unspecified range.

[0030] 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.

[0031] This utility model provides a leather-covered car armrest box, comprising a base fabric layer, a cross-linked polyolefin layer and a coating layer stacked sequentially, wherein the degree of cross-linking of the cross-linked polyolefin layer is greater than or equal to 30%.

[0032] 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.

[0033] Polyolefin materials produce very little odorous volatile matter. Compared to solvent-based PU automotive interior leather and PVC automotive interior leather with added plasticizers, the automotive interior leather produced from polyolefin materials 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.

[0034] In some embodiments, the crosslinked polyolefin layer has a crosslinking degree of greater than or equal to 30% and less than or equal to 80%. The crosslinking of the polyolefin layer can be achieved 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.

[0035] 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 the leather being hard and not soft enough in the prior art.

[0036] In some embodiments, the crosslinked polyolefin layer further includes a polyolefin adhesive layer that adheres closely to the base fabric layer. The polyolefin adhesive layer uses a blend of polyolefin and tackifying resin, or a blend of polyolefin and grafted polyolefin, as a substrate.

[0037] In some embodiments, the tackifying resin includes any one or more of rosin, rosin derivatives and terpene resins, C5, C9 and C5 / C9 petroleum resins, dicyclopentadiene resins, coumarone-indene resins, styrene series resins and condensation resins (alkylphenol resins, xylene resins), and sarin resins.

[0038] In some embodiments, the grafting group of the grafted polyolefin is one or more of glycidyl methacrylate, methyl acrylate, acrylic acid, maleic anhydride, and silane.

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

[0040] In some embodiments, in order to achieve sufficient mechanical properties, the total thickness of the cross-linked polyolefin layer and the base fabric layer is not less than 1 mm.

[0041] In some embodiments, the base fabric layer further includes a foam layer, which is preferably a polyolefin foam, such as PP foam, PE foam, or POE foam, and the thickness of the foam layer is between 0.1 mm and 0.5 mm.

[0042] In some embodiments, the armrest box is covered with leather with uniformly or non-uniformly distributed through holes, the shape of which can be one or more of the following: circular, elliptical, triangular, or regular polygonal.

[0043] 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 possesses suitable abrasion resistance, gloss, and adhesion. The coating thickness is between 3 micrometers and 20 micrometers, which can be selected by those skilled in the art according to actual needs.

[0044] In some embodiments, the TABER leather covering the armrest box is abrasion resistant to more than 3,000 cycles.

[0045] Those skilled in the art can prepare the above-mentioned polyolefin leather according to the existing technology, and conduct sample testing according to the following performance testing methods.

[0046] Example

[0047] 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.

[0048] Sample preparation:

[0049] Step 1: Preparation of raw materials for cross-linked polyolefin layer

[0050] 70 parts of POE resin (LC565);

[0051] 30 parts of EPDM rubber (3032PM);

[0052] Other additives required according to the conditions of the embodiments;

[0053] Step 2: Coating

[0054] All the 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 (13) at 120-150℃ and cooled by cold rollers at a pressure of 5-10MPa for 10-30 seconds.

[0055] Step 3: Heating crosslinking

[0056] According to the experimental design, the semi-finished product after coating is thermally crosslinked. The condition for thermal crosslinking is that the crosslinked polyolefin layer contains a peroxide crosslinking agent, such as 0.5 parts of benzoyl peroxide.

[0057] The composite of the polyolefin layer and the base fabric is heated in an oven at 160℃~180℃ and normal pressure to crosslink and cure.

[0058] Step 4: Coating and Embossing

[0059] A PU resin is coated onto the surface of the cross-linked polyolefin layer of the composite layer, and then dried and cured at 120°C to form a coating. After the coating dries, it undergoes an embossing process.

[0060] Step 5: Irradiation crosslinking

[0061] According to the experimental design, the semi-finished product after embossing is subjected to irradiation crosslinking. Irradiation can be performed using ultraviolet crosslinking, high-energy electron beam, gamma rays, or X-rays. The crosslinked polyolefin layer may contain acrylic crosslinking aids, such as 0.1 parts of TAIC.

[0062] Step 6: Punching and Covering

[0063] The polyolefin leather is CNC cut and perforated, and hot melt adhesive is sprayed onto the back; finally, the leather is precisely wrapped onto the surface of the armrest box through mechanical positioning.

[0064] Performance testing:

[0065] 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).

[0066] Abrasion resistance test: ASTM D4060 "General Plastics / Coatings Abrasion Resistance";

[0067] Softness: QB / T 5155-2017 "Test Methods for Artificial Leather and Synthetic Leather - Determination of Softness"

[0068] Example 1

[0069] In Example 1, the leather covering the car armrest box has a softness of 58 mm and an abrasion resistance of 3500 cycles. The structure is as follows: Figure 1 As shown, where:

[0070] Coating 11: Polyurethane (PU) coating, 3 micrometers thick;

[0071] Crosslinked polyolefin layer 12: a blend of peroxide-crosslinked EPDM rubber and ethylene-α-olefin copolymer, 1.2 mm thick, with a crosslinking degree of 70%;

[0072] Base fabric layer 13: Polyester reinforced base fabric, 0.1 mm thick.

[0073] Example 2

[0074] In Example 2, the leather covering the car armrest box has a softness of 58 mm and an abrasion resistance of 3800 cycles. Its structure is as follows: Figure 2 As shown, the difference from Example 1 lies in the following aspects:

[0075] Coating 11: Silicone-acrylate composite coating, 20 micrometers thick;

[0076] Cross-linked polyolefin layer 12: Irradiated cross-linked polypropylene, 0.2 mm thick, 30% cross-linking degree;

[0077] Polyolefin adhesive layer 121: Maleic anhydride-grafted polyolefin layer, 0.1 mm thick;

[0078] Foam layer 131: PE foam layer, 0.2 mm thick;

[0079] Base layer 13: Microfiber cloth, 0.1 mm thick.

[0080] Example 3

[0081] In Example 2, the leather covering the car armrest box has a softness of 50 mm and an abrasion resistance of 3600 cycles. Its structure is as follows: Figure 3 As shown, the difference between Example 3 and Example 1 is as follows: The difference between Example 3 and Example 2 is as follows:

[0082] Coating 11: Polyurethane composite coating, total thickness 10 micrometers;

[0083] Crosslinked polyolefin layer 12: an irradiated crosslinked POE and EPDM blend system, 0.5 mm thick, with a crosslinking degree of 50%;

[0084] Polyolefin adhesive layer 121: a terpene resin blended polyolefin layer with a thickness of 0.2 mm;

[0085] Base fabric layer 13: Polyester fabric, 0.5 mm thick.

[0086] 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 car armrest box covering leather, characterized by, It comprises a base fabric layer, a cross-linked polyolefin layer and a coating layer stacked sequentially, wherein the degree of cross-linking of the cross-linked polyolefin layer is greater than or equal to 30% and less than or equal to 80%.

2. The automotive armrest box covering leather according to claim 1, characterized in that, The thickness of the cross-linked polyolefin layer is between 0.2 mm and 1.2 mm.

3. The automotive armrest box covering leather according to claim 2, characterized in that, The cross-linked polyolefin layer also includes a polyolefin adhesive layer that is closely attached to the base fabric layer.

4. The automotive armrest box covering 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, and microfiber fabric, with a thickness between 0.1 mm and 1.2 mm.

5. The automotive armrest box covering leather according to claim 4, characterized in that, The base fabric layer also includes a foam layer, the thickness of which is between 0.1 mm and 0.5 mm.

6. The automotive armrest box covering 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.

7. The automotive armrest box covering leather according to claim 1, characterized in that, The coating thickness is between 3 micrometers and 20 micrometers.

8. The automotive armrest box covering leather according to claim 1, characterized in that, The coating has a wear resistance of more than 3000 cycles on one side.

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