A colorful TPO interior floor mat skin and its preparation method

Abstract

The present invention discloses a multi-colored TPO interior floor mat surface and a preparation method thereof, relating to the technical field of automobile interior decoration. The surface functional layer of the present invention is used to improve wear resistance, the multi-colored pattern layer is used to present visual effects, and the side of the bottom structure away from the substrate layer is a 3D mesh structure. The surface functional layer includes a matte water-based PUD resin, a matte water-based PUA resin, a wear-resistant additive, a cross-linking agent, and a diluent. The multi-colored pattern layer includes a water-based or solvent-based polycarbonate type polyurethane resin, a water-based or solvent-based color paste, and additives. The substrate layer includes a modified TPO resin, nano-calcium carbonate, a light-stabilizing additive, and a pigment. The bottom structure includes a modified TPE, an AC foaming agent, and a DCP cross-linking agent. The present invention achieves lightweight and personalized upgrades to the floor mat surface on the basis of meeting functional requirements through innovations such as a composite structure, a multi-colored pattern layer design, an environmentally friendly TPO substrate, and a mesh bottom structure.

Description

Technical Field

[0001] The invention relates to the technical field of automobile interior decoration, in particular to a colorful TPO interior foot pad surface and a preparation method thereof. Background Art

[0002] Leather floor mats are an indispensable part of today's car interiors. They can provide car users with anti-slip, sound insulation, shockproof, beautiful appearance, dirt resistance and other aspects of the car experience.

[0003] At present, the PVC foot pad leather that is widely used in the market has problems such as plasticizer migration, low-temperature embrittlement and difficulty in recycling, strong odor, and poor emission performance. Therefore, the industry is trying to use other materials to replace PVC foot pad leather.

[0004] The patent, CN118185327B, is titled "A Wear-Resistant Matte TPE Floor Mat and Its Preparation Method." It discloses improving the wear resistance of TPE floor mats by modifying molybdenum disulfide and improving the density and mechanical properties of the mats by filling the gaps between the materials with modified vermiculite. However, TPE materials have certain drawbacks in wear resistance and heat resistance. Even if these are improved to a certain extent through additives, they still differ from materials with superior inherent performance. While partial substitution, combining TPE with PVC, can improve other mechanical properties, it not only fails to completely address the shortcomings of PVC, but also requires glue to bond the two materials, which introduces other environmentally unfriendly factors. This combination of TPE and PVC is a very common automotive interior floor mat material on the market.

[0005] In addition, traditional floor mats have a high density and a single surface color pattern, which makes it difficult to meet people's increasing demand for lightweight and personalized floor mats. Summary of the Invention

[0006] TPO material is lightweight, low in odor, low in VOC content, and offers excellent heat, light, and low-temperature resistance. It is also more environmentally friendly than PVC. However, while TPO is stronger than TPE, its surface hardness is still insufficient compared to PVC, leading to wear and tear and a shorter service life. Furthermore, TPO material struggles to balance slip resistance, stain resistance, and tactile comfort. In summary, the present invention aims to provide a multicolored TPO interior floor mat cover and its preparation method, thereby enabling the production of interior floor mat covers that better meet market demand.

[0007] To achieve the above objectives, the present invention provides the following technical solutions: a multi-colored TPO interior floor mat surface, which is composed of a surface functional layer, a multi-colored pattern layer, a base material layer, and a bottom layer structure from the outside to the inside. The surface functional layer is used to improve wear resistance, the multi-colored pattern layer is used to present a visual effect, and the bottom layer structure has a 3D mesh structure on the side away from the base material layer.

[0008] The components of the surface functional layer are calculated by weight, including 40-80 parts of matte water-based PUD resin, 5-20 parts of matte water-based PUA resin, 1-10 parts of wear-resistant additive, 5-8 parts of cross-linking agent, and 0-30 parts of diluent;

[0009] The components of the multi-colored pattern layer are calculated by weight, including 80-95 parts of water-based or solvent-based polycarbonate type polyurethane resin, 3-10 parts of water-based or solvent-based color paste, and 0-2 parts of additives;

[0010] The components of the substrate layer are calculated by weight, including 80-95 parts of modified TPO resin, 5-10 parts of nano calcium carbonate, 0.1-4 parts of light stabilizing agent, and 2-4 parts of pigment;

[0011] The components of the bottom structure are calculated by weight and include 90-95 parts of modified TPE, 1-4 parts of AC foaming agent, and 1-4 parts of DCP cross-linking agent.

[0012] Preferably, the components of the modified TPO resin in the substrate layer include, by weight, 20-60 parts of TPV particles, 10-30 parts of LLDPE particles, 10-30 parts of PP particles, and 5-20 parts of POE particles.

[0013] Preferably, the components of the modified TPE in the bottom layer structure include, by weight, 30-70 parts of SEBS particles, 10-20 parts of PP particles, 20-40 parts of halogen-free flame retardant, and 5-20 parts of white oil.

[0014] Preferably, in the surface functional layer, the matte water-based PUD resin adopts water-based polyurethane with a solid content of 25-40%; the matte water-based PUA resin adopts water-based polyurethane acrylate with a solid content of 25-35%; the wear-resistant additive adopts ultra-high molecular weight polysiloxane dispersion with a solid content of 60-85%; the cross-linking agent adopts polycarbodiimide cross-linking agent; and the diluent adopts distilled water.

[0015] Preferably, when adding additives to the colorful pattern layer, one or both of a dispersant and a leveling agent are used.

[0016] Preferably, the thickness of the substrate layer is 0.4-0.8 mm; the density of the bottom layer is 0.3-0.6 g / cm 3 , thickness is 1.0-2.5mm.

[0017] Another technical solution provided by the present invention is a method for preparing a multi-colored TPO interior floor mat surface, comprising the following steps:

[0018] Step 1: The substrate layer and the underlying structure are co-extruded in multiple layers. The raw materials of the substrate layer components and the underlying structure components are fed into the extruder through an automatic feeding system according to the proportion, and the cast film is extruded through a double-layer co-extrusion twin-screw extruder; the substrate layer is on the top and the underlying structure is on the bottom. The gap and pressure foaming are adjusted according to the process requirements;

[0019] Step 2: The bottom structure surface of the cast film passes through a patterned back roller with a 3D mesh structure, and is extruded and cooled to form a bottom 3D mesh structure;

[0020] Step 3: The semi-finished substrate layer in step 2 is subjected to a printing machine overlay process, and a mesh roller with different patterns is used to evenly apply the color-adjusted colorful pattern layer slurry, and then heat-treated to form a colorful pattern layer;

[0021] Step 4: Use a finishing machine to evenly apply the surface functional layer slurry to the surface of the semi-finished colorful pattern layer produced in step 3, and form a surface functional layer after heat treatment.

[0022] Preferably, the temperature of the multilayer co-extrusion in step 1 is controlled at 160-210°C, the back roll gap is set at 60%-70% of the total thickness of the product, the back roll pressure is 5±1 MPa, and the heat treatment in steps 3 and 4 is respectively heated at 100-130°C for 2-3 minutes.

[0023] Preferably, before loading the printing machine in step 3, an online surface corona plasma treatment is first performed to enhance the interlayer bonding strength between the colorful pattern layer and the substrate layer.

[0024] Preferably, the power of the online surface corona plasma treatment is 1.4-3.5 kW.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. The surface of the colorful TPO interior floor mat uses environmentally friendly recyclable TPO as the base material, and the underlying structure uses foamed TPE, which can provide a soft texture and shock-absorbing effect. The two are thermally bonded in one step. The present invention takes into account lightweight design through material selection and the mesh structure of the underlying structure. The mesh structure also improves the anti-slip performance. The composite multi-layer structure adopted realizes a gradient distribution of functions and improves the wear resistance of the surface, which can meet users' demand for a high-end sense of interior floor mats for cars.

[0027] 2. The colorful TPO interior floor mat surface is innovatively designed with a colorful pattern layer, which does not affect the functions of the TPO layer and the surface functional layer. On the basis of meeting the wear resistance, weather resistance, flame retardancy, low odor and other performance requirements of the interior floor mat surface, the colorful pattern layer can further meet the personalized and technological needs of the vehicle interior, and get rid of the shortcomings of traditional floor mat leather with a single color and no pattern on the surface.

[0028] 3. The preparation method of the colorful TPO interior floor mat surface has fewer adjustments to the overall equipment and process based on the existing technology. The method is simple and easy to operate, has a low implementation cost, is easy to directly improve on the existing basis, and has a wide range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 Schematic diagram of the positional relationship of the layered structure of the present invention.

[0030] In the figure: 1. Surface functional layer; 2. Colorful pattern layer; 3. Base material layer; 4. Bottom layer. DETAILED DESCRIPTION

[0031] In order to prepare a car mat that can meet the growing needs of users in more aspects, the present invention designs a colorful TPO interior mat surface. Figure 1 , which is composed of a surface functional layer, a colorful pattern layer, a substrate layer, and a bottom layer structure from the outside to the inside. This composite structure can achieve functional gradient distribution. The surface functional layer can improve wear resistance while taking into account anti-slip properties, stain resistance and tactile comfort. The colorful pattern layer can present visual effects, such as colorful patterns, etc. The innovative design of this layer can meet the needs of personalized and technological sense of automobile interiors, get rid of the shortcomings of traditional floor mat leather with a single color and no surface patterns, and is well integrated into the multi-layer structure of the interior floor mat of the present invention without interfering with adjacent layer materials. The substrate layer uses TPO material as the main material, which is environmentally friendly and recyclable and can meet ELV regulations. The bottom layer structure is 3D mesh structure away from the substrate layer, which can reduce shock and prevent slipping. At the same time, the mesh is conducive to lightweight. The substrate layer can also play a role in supporting the transition between the 3D mesh structure and the colorful pattern layer. The specific raw material components of each layer are as follows:

[0032] The components of the surface functional layer are calculated by weight, including 40-80 parts of matte water-based PUD resin, 5-20 parts of matte water-based PUA resin, 1-10 parts of wear-resistant additive, 5-8 parts of cross-linking agent, and 0-30 parts of diluent;

[0033] The components of the multi-colored pattern layer, in parts by weight, include 80-95 parts of a water-based or solvent-based polycarbonate type polyurethane resin, 3-10 parts of a water-based or solvent-based color paste, and 0-2 parts of an additive. More preferably, the additive is one or both of a dispersant and a leveling agent, which are selected based on the color requirements of the pattern.

[0034] The components of the substrate layer are calculated by weight, including 80-95 parts of modified TPO resin, 5-10 parts of nano calcium carbonate, 0.1-4 parts of light stabilizing agent, and 2-4 parts of pigment;

[0035] The components of the bottom structure are calculated by weight and include 90-95 parts of modified TPE, 1-4 parts of AC foaming agent, and 1-4 parts of DCP cross-linking agent.

[0036] In a preferred embodiment, the components of the modified TPO resin in the substrate layer include, by weight, 20-60 parts of TPV particles, 10-30 parts of LLDPE particles, 10-30 parts of PP particles, and 5-20 parts of POE particles.

[0037] In a preferred embodiment, the components of the modified TPE in the bottom layer structure include, by weight, 30-70 parts of SEBS particles, 10-20 parts of PP particles, 20-40 parts of halogen-free flame retardant, and 5-20 parts of white oil.

[0038] In a preferred embodiment, in the surface functional layer, the matte water-based PUD resin adopts water-based polyurethane with a solid content of 25-40%; the matte water-based PUA resin adopts water-based polyurethane acrylate with a solid content of 25-35%; the wear-resistant additive adopts ultra-high molecular weight polysiloxane dispersion with a solid content of 60-85%; the cross-linking agent adopts polycarbodiimide cross-linking agent; and the diluent adopts distilled water.

[0039] The selection of the above raw materials can also refer to the following examples.

[0040] In order to better achieve the effect of the above-mentioned multi-layer structure, for reference, the thickness of the substrate layer can be controlled at 0.4-0.8mm to provide sufficient support; the density of the bottom layer structure should be 0.3-0.6 g / cm 3 , the thickness can be controlled at 1.0-2.5mm;

[0041] The specific preparation method of the interior floor mat surface of the present invention can refer to the following steps:

[0042] Step 1: The substrate layer and the underlying structure adopt a multi-layer co-extrusion process. The raw materials of the substrate layer components and the raw materials of the underlying structure components are fed into the extruder through an automatic feeding system according to the proportion, and the cast film is extruded through a double-layer co-extrusion twin-screw extruder. When adding the raw materials, the four components of the modified TPO resin and the modified TPE are added to the extruder corresponding to each layer respectively, without the need for separate preparation; the substrate layer is on the top and the underlying structure is on the bottom, and the gap and pressure foaming are adjusted according to the process requirements; for reference, the temperature of the multi-layer co-extrusion can be controlled at 160-210°C, the back roller gap is set at 60%-70% of the total thickness of the product, and the back roller pressure can be 5±1MPa;

[0043] Step 2: The bottom structure surface of the cast film passes through a patterned back roller with a 3D mesh structure, and is extruded and cooled to form a bottom 3D mesh structure, which can play a role in laminating and preventing slipping;

[0044] Step 3: The semi-finished substrate layer in step 2 is passed through a printing machine (synthetic leather surface printing machine) through a patterning process. A mesh roller with different patterns is used to evenly apply the color-adjusted colorful pattern layer slurry. After heat treatment, a colorful pattern layer is formed. The heat treatment conditions can be heating at 100-130°C for 2-3 minutes. In addition, before loading the printing machine, an online surface corona plasma treatment can be used. The power can be further selected to be 1.4-3.5kw. This treatment can further improve the interlayer bonding strength between the colorful pattern and the substrate layer (the specific interlayer bonding strength improvement results can be referred to as peeling force ≥ 25 N / cm);

[0045] Step 4: Use a finishing machine to evenly apply the surface functional layer slurry on the surface of the semi-finished colorful pattern layer made in step 3, and form a surface functional layer after heat treatment. The heat treatment conditions can be heating at 100-130°C for 2-3 minutes.

[0046] In the following embodiments, the raw materials of the surface functional layer are selected as follows: the matte water-based PUD resin is Siluoke 3247, the matte water-based PUA resin is Siluoke 1951, the wear-resistant additive is Siluoke 5289P, and the cross-linking agent is Siluoke ET-558; since the colorful pattern layer does not provide performance effects, the raw materials do not need to be specially selected; in the modified TPO resin of the substrate layer, TPV particles are ExxonMobil TPV 8281, LLDPE particles are Dow LLDPE 2607G, PP particles are ExxonMobil PP 4772, and POE particles are Dow POE 58705; in the modified TPE of the underlying structure, SEBS particles are Iracon G418.A60.N, and PP particles are ExxonMobil PP 4772.

[0047] Example 1

[0048] Substrate layer formula: 90 parts of modified TPO resin (including 50 parts of TPV particles, 15 parts of LLDPE particles, 20 parts of PP particles, and 5 parts of POE particles), 6 parts of nano-calcium carbonate, 2 parts of light stabilizing agent, and 2 parts of pigment;

[0049] Bottom layer structure formula: 94 parts of modified TPE (including 54 parts of SEBS particles, 10 parts of PP particles, 20 parts of halogen-free flame retardant, 10 parts of white oil), 3 parts of AC foaming agent, and 3 parts of DCP cross-linking agent;

[0050] Formula for the colorful pattern layer: 95 parts of polyurethane resin, 3 parts of color paste, 1 part of dispersant, and 1 part of leveling agent;

[0051] Surface functional layer formula: 80 parts of polyurethane resin (matt water-based PUD resin: matt water-based PUA resin = 8:2), 5 parts of wear-resistant additive, 5 parts of cross-linking agent, 10 parts of distilled water;

[0052] Step 1: The substrate layer and the underlying structure adopt a multi-layer co-extrusion process. The raw materials of the substrate layer components and the underlying structure components are fed into the extruder through an automatic feeding system according to the proportion (the four components of the modified TPO resin and the modified TPE are added to the extruder corresponding to each layer separately, without the need for separate preparation). The cast film is extruded through a double-layer co-extrusion twin-screw extruder; the substrate layer is on the top and the underlying structure is on the bottom. The gap and pressure are adjusted according to the process requirements for foaming; the temperature of the multi-layer co-extrusion is 195°C, the back roller gap is set at 60% of the total thickness of the product, the back roller pressure is 4MPa, the thickness of the substrate layer is 0.5mm, and the thickness of the foamed bottom layer is 2.0mm;

[0053] Step 2: The bottom structure surface of the cast film passes through a patterned back roller with a 3D mesh structure, and is extruded and cooled to form a bottom 3D mesh structure;

[0054] Step 3: The semi-finished substrate layer in step 2 is treated with online surface corona plasma at a power of 2 kW. Then, the printed pattern is evenly coated with the color-adjusted multi-color pattern layer slurry using a mesh roller required for the design pattern. The multi-color pattern layer is formed after heating at 120°C for 2 minutes.

[0055] Step 4: Use a finishing machine to evenly apply the surface functional layer slurry on the surface of the semi-finished colorful pattern layer made in step 3, and heat it at 120°C for 3 minutes to form a surface functional layer to obtain a colorful TPO interior floor mat surface.

[0056] Example 2

[0057] Substrate layer formula: 85 parts of modified TPO resin (including 50 parts of TPV particles, 10 parts of LLDPE particles, 15 parts of PP particles, and 10 parts of POE particles), 8 parts of nano-calcium carbonate, 4 parts of light stabilizing agent, and 3 parts of pigment;

[0058] Bottom layer structure formula: modified TPE 95 parts (including SEBS particles 50 parts, PP particles 15 parts, halogen-free flame retardant 20 parts, white oil 10 parts), AC foaming agent 2 parts, DCP cross-linking agent 3 parts;

[0059] Formula for the colorful pattern layer: 90 parts polyurethane resin, 8 parts color paste, 2 parts dispersant;

[0060] Surface functional layer formula: 85 parts of polyurethane resin (matt water-based PUD resin: matt water-based PUA resin = 8:2), 1 part of wear-resistant additive, 6 parts of cross-linking agent, and 8 parts of distilled water;

[0061] Step 1: The substrate layer and the underlying structure adopt a multi-layer co-extrusion process. The raw materials of the substrate layer components and the underlying structure components are fed into the extruder through an automatic feeding system according to the proportion (the four components of the modified TPO resin and the modified TPE are added to the extruder corresponding to each layer respectively, and no separate preparation is required). The cast film is extruded through a double-layer co-extrusion twin-screw extruder; the substrate layer is on the top and the underlying structure is on the bottom. The gap and pressure are adjusted according to the process requirements for foaming; the temperature of the multi-layer co-extrusion is 170°C, the back roller gap is set at 65% of the total product thickness, the back roller pressure is 5MPa, the thickness of the substrate layer is 0.6mm, and the thickness of the foamed bottom layer is 1.5mm;

[0062] Step 2: The bottom structure surface of the cast film passes through a patterned back roller with a 3D mesh structure, and is extruded and cooled to form a bottom 3D mesh structure;

[0063] Step 3: The semi-finished substrate layer in step 2 is treated with online surface corona plasma at a power of 3kw. Then, the printed pattern is evenly coated with the color-adjusted multi-color pattern layer slurry using a mesh roller required for the design pattern. The multi-color pattern layer is formed after heating at 100℃ for 3 minutes.

[0064] Step 4: Use a finishing machine to evenly apply the surface functional layer slurry on the surface of the semi-finished colorful pattern layer made in step 3, and heat it at 120°C for 2 minutes to form a surface functional layer to obtain a colorful TPO interior floor mat surface.

[0065] Example 3

[0066] Substrate layer formula: 80 parts of modified TPO resin (including 20 parts of TPV particles, 20 parts of LLDPE particles, 20 parts of PP particles, and 20 parts of POE particles), 10 parts of nano-calcium carbonate, 0.5 parts of light stabilizing agent, and 2 parts of pigment;

[0067] Bottom layer structure formula: modified TPE 90 parts (including SEBS particles 35 parts, PP particles 15 parts, halogen-free flame retardant 20 parts, white oil 20 parts), AC foaming agent 4 parts, DCP cross-linking agent 2 parts;

[0068] Formula for the colorful pattern layer: 80 parts of polyurethane resin and 5 parts of color paste;

[0069] Surface functional layer formula: 50 parts of matte water-based PUD resin, 10 parts of matte water-based PUA resin, 8 parts of wear-resistant additive, 5 parts of cross-linking agent, and 5 parts of distilled water;

[0070] Step 1: The substrate layer and the underlying structure adopt a multi-layer co-extrusion process. The raw materials of the substrate layer components and the underlying structure components are fed into the extruder through an automatic feeding system according to the proportion (the four components of the modified TPO resin and the modified TPE are added to the extruder corresponding to each layer respectively, without the need for separate preparation). The cast film is extruded through a double-layer co-extrusion twin-screw extruder; the substrate layer is on the top and the underlying structure is on the bottom. The gap and pressure are adjusted according to the process requirements for foaming; the temperature of the multi-layer co-extrusion is 200℃, the back roller gap is set at 60% of the total thickness of the product, the back roller pressure is 4MPa, the thickness of the substrate layer is 0.5mm, and the thickness of the foamed bottom layer is 2mm;

[0071] Step 2: The bottom structure surface of the cast film passes through a patterned back roller with a 3D mesh structure, and is extruded and cooled to form a bottom 3D mesh structure;

[0072] Step 3: The semi-finished substrate layer in step 2 is treated with online surface corona plasma at a power of 3kw. Then, the printed pattern is evenly coated with the color-adjusted multi-color pattern layer slurry using a mesh roller required for the design pattern. The multi-color pattern layer is formed after heating at 120℃ for 2 minutes.

[0073] Step 4: Use a finishing machine to evenly apply the surface functional layer slurry on the surface of the semi-finished colorful pattern layer made in step 3, and heat it at 120°C for 2 minutes to form a surface functional layer to obtain a colorful TPO interior floor mat surface.

[0074] Example 4

[0075] Substrate layer formula: 95 parts of modified TPO resin (including 60 parts of TPV particles, 10 parts of LLDPE particles, 20 parts of PP particles, 5 parts of POE particles), 5 parts of nano-calcium carbonate, 1 part of light stabilizing agent, and 2 parts of pigment;

[0076] Bottom layer structure formula: modified TPE 90 parts (including SEBS particles 30 parts, PP particles 10 parts, halogen-free flame retardant 30 parts, white oil 20 parts), AC foaming agent 2 parts, DCP cross-linking agent 2 parts;

[0077] Formula for the colorful pattern layer: 90 parts of polyurethane resin, 10 parts of color paste, 1 part of dispersant, and 1 part of leveling agent;

[0078] Surface functional layer formula: 80 parts of matte water-based PUD resin, 20 parts of matte water-based PUA resin, 2 parts of wear-resistant additive, 8 parts of cross-linking agent, and 20 parts of distilled water;

[0079] Step 1: The substrate layer and the underlying structure adopt a multi-layer co-extrusion process. The raw materials of the substrate layer components and the underlying structure components are fed into the extruder through an automatic feeding system according to the proportion (the four components of the modified TPO resin and the modified TPE are added to the extruder corresponding to each layer respectively, and no separate preparation is required). The cast film is extruded through a double-layer co-extrusion twin-screw extruder; the substrate layer is on the top and the underlying structure is on the bottom. The gap and pressure are adjusted according to the process requirements for foaming; the temperature of the multi-layer co-extrusion is 190°C, the back roller gap is set at 70% of the total thickness of the product, the back roller pressure is 6MPa, the thickness of the substrate layer is 0.5mm, and the thickness of the foamed bottom layer is 1.5mm;

[0080] Step 2: The bottom structure surface of the cast film passes through a patterned back roller with a 3D mesh structure, and is extruded and cooled to form a bottom 3D mesh structure;

[0081] Step 3: The semi-finished substrate layer in step 2 is treated with online surface corona plasma at a power of 2 kW. Then, the printed pattern is evenly coated with the color-adjusted multi-color pattern layer slurry using a mesh roller required for the design pattern. The multi-color pattern layer is formed after heating at 120°C for 2 minutes.

[0082] Step 4: Use a finishing machine to evenly apply the surface functional layer slurry on the surface of the semi-finished colorful pattern layer made in step 3, and heat it at 120°C for 3 minutes to form a surface functional layer to obtain a colorful TPO interior floor mat surface.

[0083] Each embodiment was tested for performance according to the following method, and the test results were excellent:

[0084] Wear resistance QB / T 2726, Taber test, H18, 500g, 2000 abrasions, mass loss ≤1%;

[0085] Weather resistance GB / T 32088-2015 A-1, no cracking, powdering, stickiness or other abnormalities after 600h;

[0086] Flame retardancy GB8410, ≤100mm / min;

[0087] Odor PV3900, ≤3.5 level;

[0088] Nebulization DIN75201 B method, ≤2mg;

[0089] Total carbon VDA277, ≤20ugc / g.

[0090] The specific test results are shown in Table 1:

[0091] Table 1 Test results of the embodiment

[0092]

[0093] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection defined by the claims.

[0094] Any matters not described in detail in the present invention are well-known technologies to those skilled in the art.

Claims

1. A colorful TPO interior floor mat surface, characterized by: From the outside to the inside, it consists of a surface functional layer, a colorful pattern layer, a base material layer, and a bottom structure. The surface functional layer is used to improve wear resistance, the colorful pattern layer is used to present visual effects, and the bottom structure is a 3D mesh structure on the side away from the base material layer. The components of the surface functional layer are calculated by weight, including 40-80 parts of matte water-based PUD resin, 5-20 parts of matte water-based PUA resin, 1-10 parts of wear-resistant additive, 5-8 parts of cross-linking agent, and 0-30 parts of diluent. The matte water-based PUD resin is Siluoke 3247, the matte water-based PUA resin is Siluoke 1951, the wear-resistant additive is Siluoke 5289P, and the cross-linking agent is Siluoke ET-558. The components of the multi-colored pattern layer are calculated by weight, including 80-95 parts of water-based or solvent-based polycarbonate type polyurethane resin, 3-10 parts of water-based or solvent-based color paste, and 0-2 parts of additives; The components of the substrate layer are calculated by weight, including 80-95 parts of modified TPO resin, 5-10 parts of nano calcium carbonate, 0.1-4 parts of light stabilizing agent, and 2-4 parts of pigment; The components of the bottom structure are calculated by weight, including 90-95 parts of modified TPE, 1-4 parts of AC foaming agent, and 1-4 parts of DCP cross-linking agent; The modified TPO resin in the substrate layer comprises, by weight, 20-60 parts of TPV particles, 10-30 parts of LLDPE particles, 10-30 parts of PP particles, and 5-20 parts of POE particles, wherein the TPV particles are ExxonMobil TPV 8281, the LLDPE particles are Dow LLDPE 2607G, the PP particles are ExxonMobil PP 4772, and the POE particles are Dow POE 58705; The modified TPE components in the bottom layer structure include, by weight, 30-70 parts of SEBS particles, 10-20 parts of PP particles, 20-40 parts of halogen-free flame retardant, and 5-20 parts of white oil, wherein the SEBS particles are Iratron G418.A60.N and the PP particles are ExxonMobil PP 4772. The method for preparing the interior trim mat surface comprises the following steps: Step 1: The substrate layer and the underlying structure are co-extruded in multiple layers. The raw materials of the substrate layer components and the underlying structure components are fed into the extruder through an automatic feeding system according to the proportion, and the cast film is extruded through a double-layer co-extrusion twin-screw extruder; the substrate layer is on the top and the underlying structure is on the bottom. The gap and pressure foaming are adjusted according to the process requirements; Step 2: The bottom structure surface of the cast film passes through a patterned back roller with a 3D mesh structure, and is extruded and cooled to form a bottom 3D mesh structure; Step 3: The semi-finished substrate layer in step 2 is subjected to a printing machine overlay process, and a mesh roller with different patterns is used to evenly apply the color-adjusted colorful pattern layer slurry, and then heat-treated to form a colorful pattern layer; Step 4: Use a finishing machine to evenly apply the surface functional layer slurry to the surface of the semi-finished colorful pattern layer produced in step 3, and form a surface functional layer after heat treatment.

2. The multi-colored TPO interior floor mat surface according to claim 1, characterized in that: In the surface functional layer, distilled water is used as the diluent.

3. The multi-colored TPO interior floor mat surface according to claim 1, characterized in that: When adding auxiliary agents to the colorful pattern layer, one or both of dispersants and leveling agents are used.

4. The multi-colored TPO interior floor mat surface according to claim 1, characterized in that: The thickness of the substrate layer is 0.4-0.8 mm; the density of the bottom layer structure is 0.3-0.6 g / cm 3 , thickness is 1.0-2.5mm.

5. The multi-colored TPO interior floor mat surface according to claim 1, characterized in that: In step 1, the temperature of the multi-layer co-extrusion is controlled at 160-210° C., the back roller gap is set at 60%-70% of the total thickness of the product, the back roller pressure is 5±1 MPa, and the heat treatment in steps 3 and 4 is respectively heated at 100-130° C. for 2-3 minutes.

6. The multi-colored TPO interior floor mat surface according to claim 5, characterized in that: In step 3, before loading the printing machine, an online surface corona plasma treatment is first performed to enhance the interlayer bonding strength between the colorful pattern layer and the substrate layer.

7. The multi-colored TPO interior floor mat surface according to claim 6, characterized in that: The power of the online surface corona plasma treatment is 1.4-3.5 kW.

Images