Press-resilience-resistant automotive interior thin film and preparation method thereof

Abstract

The invention relates to the technical field of high polymer materials, and particularly discloses an automotive trim film resistant to press resilience and a preparation method thereof. The pressing-resilience-resistant automotive interior film sequentially comprises a foaming layer, a modified PVC surface layer and a surface coating from bottom to top, and the modified PVC surface layer is prepared from the following raw materials in parts by weight: 90-100 parts of PVC resin powder, 10-15 parts of ABS particles, 5-9 parts of an elastomer, 53-84 parts of a plasticizer, 13-30 parts of a stabilizer and 3-9 parts of titanium dioxide; the foaming layer comprises the following raw materials in parts by weight: 55-75 parts of polypropylene and 15-23 parts of a foaming agent. The pressing-resilience-resistant automobile interior thin film can be used for preparing an automobile interior skin wrapping layer, and has the advantages of good texture, pressing resistance, excellent resilience and low preparation cost.

Description

Technical Field

[0001] The present invention relates to the field of polymer material technology, and more specifically, to a compression-resistant and rebound-resistant automotive interior film and a preparation method thereof. Background Art

[0002] With the development of science and technology, polyvinyl chloride (PVC) has been widely used in various industries due to its good plasticity, mechanical properties and recyclability, excellent flame retardancy and moisture resistance and low price, becoming the most widely used environmentally friendly plastic material. PVC products have been widely used in the automotive interior industry, becoming the main component material of automotive dashboards, door panels, roofs, seat cushions, wood grain finishes, sun visors, armrests, gear shift covers and other interior products, and the global demand for PVC is growing year by year.

[0003] At present, high-end automotive interiors use soft materials. The polymer resin used in the surface layer is mostly a blend of reinforced PP, ABS / PC or styrene / maleic anhydride (SMA), and the foam layer mainly uses polyurethane foam layer (PUFoam) or polypropylene foam (PPF). The surface of the hard interior is hard, usually a single-layer structure directly injection molded, mostly using modified PP or TPO materials. The texture is not as good as soft interior, and it is mostly used in trucks, buses and economic cars. Soft interior gives people a sense of comfort and luxury, and also has the function of absorbing collision energy and noise, so it is mostly used in mid-to-high-end cars.

[0004] In recent years, more and more models have adopted soft interiors, and various OEMs also hope to adopt soft interiors in mid- and low-end models, but they are often unable to do so due to cost constraints. In view of the above-mentioned related technologies, the inventors also found that the current soft interior materials still have the disadvantages of weather resistance and unsatisfactory texture, which makes it difficult to meet consumers' requirements for the comfort of automobile interiors. Summary of the invention

[0005] In order to improve the compression resistance and rebound performance of automobile interior and enhance the texture of automobile interior materials, the present application provides a compression-resistant and rebound automobile interior film and a preparation method thereof. In the first aspect, the present application provides a compression-resistant and rebound-resistant automotive interior film, which adopts the following technical solution: A compression-resistant and rebound-resistant automotive interior film comprises, from bottom to top, a foaming layer, a modified PVC skin layer and a surface coating layer. The raw materials of the modified PVC skin layer comprise 90-100 parts of PVC resin powder, 10-15 parts of ABS particles, 5-9 parts of elastomer, 53-84 parts of plasticizer, 13-30 parts of stabilizer and 3-9 parts of titanium dioxide in parts by weight; the raw materials of the foaming layer comprise 55-75 parts of polypropylene and 15-23 parts of foaming agent.

[0006] By adopting the above technical scheme, the automotive interior film of the present application forms a three-layer structure of a polypropylene foam layer, a modified PVC skin layer and a surface coating layer. The polypropylene foam layer gives the film lightness and cushioning properties, the modified PVC skin layer gives the film weather resistance, pressure resistance and rebound properties, and the surface coating layer gives the film good wear resistance and scratch resistance and touch.

[0007] With PVC as the base material and ABS as the reinforcement, an elastomer is added to adjust the flexibility, promote the absorption and dispersion of external impact force, and form a PVC-ABS-elastomer ternary modified PVC epidermis, which effectively combines the weather resistance of PVC, the strength of ABS and the flexibility of the elastomer, giving the automotive interior film material excellent compression resistance and resilience. The raw material cost of this application is relatively low, which can significantly reduce the production cost, and the finished product has a low odor, which can meet the odor requirements of the main engine factory.

[0008] Optionally, the plasticizer includes 45-60 parts of epoxy stearate, 3-9 parts of diethyl phthalate and 5-15 parts of epoxy soybean oil, based on parts by weight.

[0009] By adopting the above technical scheme, octyl epoxy stearate, diethyl phthalate and natural plasticizer epoxy soybean oil all have good compatibility with the PVC matrix. All three have low odor and can effectively improve the flexibility and ductility of the automotive interior film, while helping to reduce the odor of the automotive interior film.

[0010] Optionally, the foaming agent includes 10-15 parts of azobisformamide and 5-8 parts of diethyl azodicarboxylate, based on weight parts.

[0011] By adopting the above technical scheme, the mixed use of azobisformamide and diethyl azodicarboxylate can optimize the performance of the foaming system, reduce the emission of harmful gases, improve the foaming quality, and be more environmentally friendly and gentle.

[0012] Optionally, the stabilizer includes 10-30 parts of calcium carbonate whiskers and 3-8 parts of calcium sulfate whiskers in parts by weight.

[0013] By adopting the above technical solution, the whisker is a one-dimensional material with high strength and modulus, which can be evenly dispersed in the composite material to effectively improve the mechanical properties of the composite material. Calcium carbonate whiskers and calcium sulfate whiskers are both needle-shaped materials, which make up for the weakness of high cost of traditional reinforcement materials. At the same time, they have excellent strength and heat-resistant and heat-insulating properties, and can effectively improve the stability and heat resistance of the modified PVC surface layer.

[0014] Optionally, the elastomer is a thermoplastic polyurethane elastomer.

[0015] Optionally, the surface coating is formed by a finishing agent, and the finishing agent is a polycarbonate material selected from Polycarbonate polyol TBC1000.

[0016] By adopting the above technical solution, the polycarbonate material has excellent wear resistance. It is used as a coating agent to prepare a surface coating, which helps to improve the surface texture and touch of the automotive interior film material, while ensuring the strong bonding between the surface coating and the modified PVC epidermis and excellent wear resistance and scratch resistance.

[0017] In a second aspect, the present application provides a method for preparing a compression-resistant and rebound-resistant automotive interior film, which adopts the following technical solution: A method for preparing a compression-resistant and rebound-resistant automotive interior film comprises the following steps: S1: Weigh PVC resin powder, ABS particles, elastomer, plasticizer, stabilizer and titanium dioxide according to weight parts, mix, melt extrude, cast into film, and cool and shape to obtain a modified PVC skin layer; S2: Blending polypropylene and a foaming agent, and then performing melt extrusion foaming, molding, and cooling to obtain a foaming layer, and then bonding the modified PVC skin layer and the foaming layer with a binder; S3: coating the finishing agent on the side of the modified PVC skin layer away from the foaming layer in the form of roller coating, and forming a surface coating layer after drying.

[0018] By adopting the above technical scheme, the preparation process of the present application is simple, combining the weather resistance of PVC, the strength of ABS and the flexibility of elastomers, as well as the lightness and cushioning performance of the foaming layer, so that the finally prepared automotive interior film has excellent comprehensive performance and can be produced on a large scale, which helps to improve production efficiency and reduce production costs.

[0019] By bonding the modified PVC skin layer to the foam layer through a glue, a firm bond between the two layers can be ensured while maintaining overall flexibility and durability.

[0020] Optionally, the thickness of the foaming layer is 2.5-3 mm, the thickness of the modified PVC skin layer is 0.8-1.6 mm, and the thickness of the surface coating layer is 0.01-0.05 mm.

[0021] By adopting the above technical solutions, precise control of the thickness of each layer helps to ensure the pressure resistance, resilience and appearance texture of the automotive interior film material.

[0022] Optionally, the adhesive is selected from Huirui PP adhesive HR-735.

[0023] By adopting the above technical solution, Huirui PP adhesive HR-735 has a high bonding strength between PP and PVC as an adhesive. After curing, it is tough and not hard and resistant to falling. It can provide good bonding effect and meet environmental protection requirements, ensuring the close bonding of the foaming layer and the modified PVC surface layer, and improving the stability and durability of the overall material.

[0024] In summary, this application has the following beneficial effects: 1. The present application adopts a three-layer composite structure of a polypropylene foam layer, a modified PVC skin layer and a polycarbonate material surface coating layer, which combines the lightness and cushioning properties of the polypropylene foam layer, the weather resistance of PVC, the strength of ABS and the flexibility of the elastomer, and the wear resistance and scratch resistance of the polycarbonate material. The formed automotive interior film has a flexible feel and good press rebound effect, and has good weather resistance. When applied to automotive interiors such as dashboards, door panels, and door panel mountings, it can improve the hard surface of plastic dashboards and protective panels used alone, giving people a comfortable and high-end feeling.

[0025] 2. The raw materials used in this application have low costs and low odor, and can be widely produced and used, which makes up for the shortcomings of traditional soft interior materials that cannot be widely used due to cost constraints. At the same time, it can meet the requirements of major OEMs for the odor and emission of automobile interiors. DETAILED DESCRIPTION

[0026] The following examples further illustrate the present application in detail.

[0027] raw material Unless otherwise specified, the raw materials used in the examples and comparative examples of the present application are all commercially available products, specifically: PVC resin powder, with a degree of polymerization of 1300; ABS particles, selected from PetroChina, 0215E; Thermoplastic polyurethane elastomer, selected from Wanhua Chemical, WHT-6290; Epoxy stearate, selected from Guangzhou Shanshui Chemical Co., Ltd., Lankroflex ED6; Epoxidized soybean oil, selected from Fengyi New Materials, PVC plasticizer 001; Polypropylene, selected from Sinopec Maoming, HT9025NX; Azobisformamide, selected from Wuhan Kanosi Technology Co., Ltd., CAS: 123-77-3; Diethyl azodicarboxylate, selected from Hubei Fangde New Materials Co., Ltd., CAS: 1972-28-7; Calcium carbonate whiskers, purity ≥98%, length 30±5μm, aspect ratio 25±5; Calcium carbonate particles, purity ≥99%, average particle size 200 mesh; Calcium sulfate whiskers, purity ≥98%, length 200±20μm, aspect ratio 20±5; Calcium sulfate particles, purity ≥99%, average particle size 200 mesh; Adhesive, selected from Huirui PP adhesive, HR-735; Water-based polyurethane finishing agent, selected from Ruilin, RL-63012A; The finishing agent is a polycarbonate material selected from Polycarbonate polyol TBC1000. Example

[0028] Example 1 A compression-resistant and rebound-resistant automotive interior film comprises, from bottom to top, a foaming layer, a modified PVC skin layer and a surface coating layer. The raw materials and amounts of the foaming layer and the modified PVC skin layer are shown in Table 1, wherein the elastomer is a thermoplastic polyurethane elastomer; and the surface coating layer is formed by a polycarbonate material coating agent.

[0029] Table 1 The method for preparing the above-mentioned compression-resistant and rebound-resistant automotive interior film comprises the following steps: S1: PVC resin powder, ABS particles, elastomer, plasticizer, stabilizer and titanium dioxide were weighed respectively according to weight parts, blended, melt-extruded, cast into films, and cooled and formed to obtain a modified PVC epidermis with a thickness of 1.3 mm; S2: Blending polypropylene and a foaming agent, and then performing melt extrusion foaming, molding, and cooling to obtain a foaming layer with a thickness of 2.6 mm, and then bonding the modified PVC skin layer and the foaming layer with a binder; S3: coating a polycarbonate coating agent on the side of the modified PVC skin layer away from the foaming layer by roller coating, and forming a surface coating layer after drying, with a thickness of 0.01 mm, to obtain an automobile interior film which comprises a foaming layer, a modified PVC skin layer and a surface coating layer from bottom to top.

[0030] Example 2 A compression-resistant and rebound-resistant automotive interior film, which is different from Example 1 in that the raw materials and amounts of the foaming layer and the modified PVC surface layer are as shown in Table 1.

[0031] The method for preparing the above-mentioned compression-resistant and rebound-resistant automotive interior film comprises the following steps: S1: PVC resin powder, ABS particles, elastomer, plasticizer, stabilizer and titanium dioxide were weighed respectively according to weight parts, blended, melt-extruded, cast into films, and cooled to obtain a modified PVC epidermis with a thickness of 1.6 mm; S2: Blending polypropylene and a foaming agent, and then performing melt extrusion foaming, molding, and cooling to obtain a foaming layer with a thickness of 2.5 mm, and then bonding the modified PVC skin layer and the foaming layer with a binder; S3: coating a polycarbonate coating agent on the side of the modified PVC skin layer away from the foaming layer by roller coating, and forming a surface coating layer after drying, with a thickness of 0.03 mm, to obtain an automobile interior film which comprises a foaming layer, a modified PVC skin layer and a surface coating layer from bottom to top.

[0032] Example 3 A compression-resistant and rebound-resistant automotive interior film, which is different from Example 1 in that the raw materials and amounts of the foaming layer and the modified PVC surface layer are as shown in Table 1.

[0033] The method for preparing the above-mentioned compression-resistant and rebound-resistant automotive interior film comprises the following steps: S1: PVC resin powder, ABS particles, elastomer, plasticizer, stabilizer and titanium dioxide were weighed respectively according to weight parts, blended, melt-extruded, cast into films, and cooled and formed to obtain a modified PVC epidermis with a thickness of 3 mm; S2: Blending polypropylene and a foaming agent, and then performing melt extrusion foaming, molding, and cooling to obtain a foaming layer with a thickness of 1 mm, and then bonding the modified PVC skin layer and the foaming layer with a binder; S3: A coating agent of a polycarbonate material is applied by roller coating on the side of the modified PVC skin layer away from the foaming layer, and a surface coating layer is formed after drying with a thickness of 0.04 mm, so as to obtain an automobile interior film which comprises a foaming layer, a modified PVC skin layer and a surface coating layer from bottom to top.

[0034] Example 4 A compression-resistant and rebound-resistant automotive interior film, which is different from Example 1 in that the raw materials and amounts of the foaming layer and the modified PVC surface layer are as shown in Table 1.

[0035] The method for preparing the above-mentioned compression-resistant and rebound-resistant automotive interior film comprises the following steps: S1: PVC resin powder, ABS particles, elastomer, plasticizer, stabilizer and titanium dioxide were weighed respectively according to weight parts, blended, melt-extruded, cast into films, and cooled and formed to obtain a modified PVC epidermis with a thickness of 0.8 mm; S2: Blending polypropylene and a foaming agent, and then performing melt extrusion foaming, molding, and cooling to obtain a foaming layer with a thickness of 2.7 mm, and then bonding the modified PVC skin layer and the foaming layer with a binder; S3: coating a polycarbonate coating agent on the side of the modified PVC skin layer away from the foaming layer by roller coating, and forming a surface coating layer after drying, with a thickness of 0.05 mm, to obtain an automobile interior film which comprises a foaming layer, a modified PVC skin layer and a surface coating layer from bottom to top.

[0036] Example 5 A car interior film with compression resistance and rebound performance is disclosed. The difference from Example 1 is that the raw material plasticizer of the modified PVC surface layer is only octyl epoxy stearate, and the other steps are the same as those of Example 1.

[0037] Example 6 A car interior film with compression resistance and rebound performance is different from Example 1 in that the raw material plasticizer of the modified PVC surface layer is only diethyl phthalate, and the other steps are the same as those of Example 1.

[0038] Example 7 A car interior film with compression resistance and rebound performance is different from Example 1 in that the raw material plasticizer of the modified PVC surface layer is only epoxy soybean oil, and the other steps are the same as those of Example 1.

[0039] Example 8 A car interior film that is resistant to compression and rebounds, which differs from Example 1 in that the calcium carbonate whiskers in the raw material stabilizer of the modified PVC epidermis are replaced by calcium carbonate particles of equal mass, and the calcium sulfate whiskers are replaced by calcium sulfate particles of equal mass, and the other steps are the same as Example 1.

[0040] Example 9 A car interior film with compression resistance and rebound performance is disclosed. The difference from Example 1 is that the surface coating layer is formed by a water-based polyurethane coating agent, and the other steps are the same as those of Example 1.

[0041] Comparative Example Comparative Example 1 A car interior film with compression resistance and rebound performance is disclosed. The difference from Example 1 is that the ABS particles in the modified PVC surface layer raw material are replaced with PVC resin powder of equal mass, and the other steps are the same as those of Example 1.

[0042] Comparative Example 2 A car interior film with compression resistance and rebound performance is disclosed. The difference from Example 1 is that the elastomer in the modified PVC surface layer raw material is replaced by PVC resin powder of equal mass, and the other steps are the same as those of Example 1.

[0043] Comparative Example 3 A compression-resistant and rebound-resistant automotive interior film, which is different from the embodiment 1 in that its preparation method comprises the following steps: S1: Blending polypropylene and a foaming agent, and then performing melt extrusion foaming, molding, and cooling to obtain a foaming layer with a thickness of 2.6 mm; S2: PVC resin powder, ABS particles, elastomer, plasticizer, stabilizer and titanium dioxide were weighed respectively according to weight parts, melt-extruded and cast into films after blending, and cooled and formed to obtain a modified PVC skin layer with a thickness of 1.3 mm, and the foaming layer was thermally composited with one side of the modified PVC skin layer to form a substrate composited with the foaming layer and the modified PVC skin layer; S3: coating a polycarbonate coating agent on the side of the modified PVC skin layer away from the foaming layer by roller coating, and forming a surface coating layer after drying, with a thickness of 0.01 mm, to obtain an automobile interior film which comprises a foaming layer, a modified PVC skin layer and a surface coating layer from bottom to top.

[0044] Performance testing The following relevant performance test tests were performed on the compression-resistance and rebound-resistant automotive interior films obtained in Examples 1-9 and Comparative Examples 1-3. Each test was performed 3 times, and the average value was taken as the final result and recorded in Table 2.

[0045] 1. Peel strength: Refer to the standards and regulations of ISO 2411 to test the peel strength of the foam layer and modified PVC skin layer of the above-mentioned automotive interior film at room temperature, after environmental cycle and after heat resistance treatment. The qualified standards are as follows: Room temperature peel strength: ≥10N / 5cm or 100% foam tearing; Peel strength after environmental cycling: ≥8N / 5cm or 100% foam tearing; Peel strength after heat treatment: ≥8N / 5cm or 100% foam tearing.

[0046] 2. Odor: Refer to the standards and regulations of PV3900 to test the odor level of the above-mentioned automotive interior films.

[0047] 3. Scratch resistance: The above-mentioned automotive interior film was subjected to a cross-hatch test with reference to the German Volkswagen PV3952 standard. The sample size was 50mm×50mm×3.2mm and the load was 10N. The color difference L value change ΔL before and after the cross-hatch area test was measured with a colorimeter. The smaller the ΔL value, the better the scratch resistance of the surface material.

[0048] 4. Resilience: The rebound rate of the above-mentioned automotive interior film was tested with reference to the relevant standards and regulations of GB / T 6670.

[0049] 5. Tensile strength: The tensile strength of the above-mentioned automotive interior film was tested with reference to the relevant standards and regulations of GB / T 1040.

[0050] Table 2 According to the performance test results in Table 2, it can be seen that the compression-resistant and rebound automobile interior film of the present application has good resilience and excellent mechanical properties, and the odor meets the standards. It has good wear resistance and scratch resistance, and can be used as a softening material in the preparation of surface wrapping materials for high-end automobile interiors. It can give the automobile interior a better texture and durability to meet consumers' requirements for the comfort of automobile interior use.

[0051] At the same time, the raw materials used in this application are of low cost and can be widely produced and applied, making up for the shortcomings of traditional soft interior materials that cannot be widely used due to cost constraints.

[0052] It can be seen from the performance test results of Examples 1-4, Example 9 and Comparative Examples 1-3 that the present application adopts a three-layer composite structure of a polypropylene foam layer, a modified PVC skin layer and a polycarbonate material surface coating layer, which combines the lightness and cushioning properties of the polypropylene foam layer, the weather resistance of PVC, the strength of ABS, the flexibility of the elastomer and the wear resistance and scratch resistance of the polycarbonate material. The formed automotive interior film has a flexible feel and good press rebound effect, and has excellent mechanical properties and is more durable.

[0053] Compared with the thermal lamination method, the bonding strength between the non-polar polypropylene foam layer and the modified PVC surface layer is significantly improved by laminating with a specific adhesive, thereby ensuring the normal use of the product.

[0054] According to the performance test results of Examples 1-4 and Examples 5-8, it can be seen that octyl epoxystearate, diethyl phthalate and natural plasticizer epoxy soybean oil have good compatibility with the PVC matrix and have low odor. When used in combination, they can effectively improve the flexibility and ductility of the automotive interior film, while improving the mechanical properties of the film and minimizing the odor of the film.

[0055] The use of one-dimensional whisker-shaped calcium carbonate and calcium sulfate can more effectively improve the mechanical properties and wear and scratch resistance of automotive interior films compared to granular materials. As stabilizers, they ensure the weather resistance and stability of the modified PVC surface layer and avoid the migration of plasticizers and other raw materials.

[0056] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A car interior film resistant to compression and rebound, characterized in that: The invention comprises, from bottom to top, a foaming layer, a modified PVC skin layer and a surface coating layer. The raw materials of the modified PVC skin layer include, by weight, 90-100 parts of PVC resin powder, 10-15 parts of ABS particles, 5-9 parts of elastomer, 53-84 parts of plasticizer, 13-30 parts of stabilizer and 3-9 parts of titanium dioxide. The raw materials of the foaming layer include 55-75 parts of polypropylene and 15-23 parts of foaming agent.

2. The automotive interior film resistant to compression and rebound according to claim 1, characterized in that: In parts by weight, the plasticizer includes 45-60 parts of epoxy stearate octyl ester, 3-9 parts of diethyl phthalate and 5-15 parts of epoxy soybean oil.

3. The automotive interior film resistant to compression and rebound according to claim 1, characterized in that: In parts by weight, the foaming agent includes 10-15 parts of azobisformamide and 5-8 parts of diethyl azodicarboxylate.

4. The automotive interior film resistant to compression and rebound according to claim 1, characterized in that: In parts by weight, the stabilizer includes 10-30 parts of calcium carbonate whiskers and 3-8 parts of calcium sulfate whiskers.

5. The automotive interior film resistant to compression and rebound according to claim 1, characterized in that: The elastomer is a thermoplastic polyurethane elastomer.

6. The automotive interior film resistant to compression and rebound according to claim 1, characterized in that: The surface layer is formed by a finishing agent, and the finishing agent is a polycarbonate material selected from Mofltive® polycarbonate polyol TBC1000.

7. The method for preparing a compression-resistant and rebound-resistant automotive interior film according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1: Weigh PVC resin powder, ABS particles, elastomer, plasticizer, stabilizer and titanium dioxide according to weight parts, mix, melt extrude, cast into film, and cool and shape to obtain a modified PVC skin layer; S2: Blending polypropylene and a foaming agent, and then performing melt extrusion foaming, molding, and cooling to obtain a foaming layer, and then bonding the modified PVC skin layer and the foaming layer with a binder; S3: coating the finishing agent on the side of the modified PVC skin layer away from the foaming layer in the form of roller coating, and forming a surface coating layer after drying.

8. The method for preparing the compression-resistant and rebound-resistant automotive interior film according to claim 7, characterized in that: The thickness of the foaming layer is 2.5-3 mm, the thickness of the modified PVC skin layer is 0.8-1.6 mm, and the thickness of the surface coating layer is 0.01-0.05 mm.

9. The method for preparing the compression-resistant and rebound-resistant automotive interior film according to claim 7, characterized in that: The adhesive is selected from Huirui PP adhesive HR-735.

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