Alcohol-resistant automobile interior TPO (Thermoplastic Polyolefin) skin

Abstract

The invention discloses an alcohol-resistant automobile interior TPO skin, and relates to the technical field of artificial leather. The alcohol-resistant automobile interior TPO skin comprises a coating, a TPO surface layer and a foaming layer from top to bottom, wherein the coating comprises a surface layer and a bottom coating; the surface layer is prepared from the following raw materials in a mass ratio: a matte water-based polycarbonate polyurethane emulsion, a bright water-based polycarbonate polyurethane emulsion, a curing agent, a slipping agent and a defoaming agent in a mass ratio of 3: 1: (0.24-0.48): (0.24-0.4): (0.012-0.016); the bottom coating comprises the following raw materials: waterborne polyurethane resin and a carbodiimide curing agent in a mass ratio of 100: (4-6). The alcohol-resistant automobile interior TPO skin has the effect of good alcohol resistance, and the problem that an existing automobile interior TPO skin is poor in alcohol resistance is solved.

Description

Technical Field

[0001] The invention relates to the technical field of artificial leather, in particular to an alcohol-resistant TPO surface skin for automobile interior decoration. Background Art

[0002] With the development of economy and the continuous improvement of people's lives, cars have become an indispensable tool for mass travel, and cars are increasingly used in people's lives. TPO skin for automotive interiors is recognized as one of the best automotive interior materials in this century due to its simple processing technology, low cost, stable process, good weather resistance, and low odor.

[0003] The automotive interior TPO skin usually includes a functional coating, a TPO surface layer and a foaming layer from top to bottom. The functional coating is covered on the surface of the TPO surface layer to enhance the scratch resistance, wear resistance, alcohol resistance, heat resistance and anti-fouling properties of the automotive interior TPO skin. At present, conventional functional coatings are usually water-based polyurethane coatings or oil-based solvent-based coatings. In actual use, people have found that the alcohol resistance of water-based polyurethane coatings and oil-based solvent-based coatings is weak. After wiping the surface of the functional coating with alcohol, alcohol has super permeability, and alcohol easily penetrates the functional coating and penetrates between the TPO surface layer and the functional coating. Because of the heat generated during wiping, alcohol will dissolve or soften the functional coating, resulting in damage to the functional coating, or even causing the entire functional coating to peel off, exposing the TPO surface layer, causing the surface of the automotive interior TPO skin to turn white, thereby seriously affecting the use effect of the automotive interior TPO skin. Therefore, it is urgent to develop a automotive interior TPO skin with good alcohol resistance. Summary of the invention

[0004] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide an alcohol-resistant automobile interior TPO skin, which has good alcohol resistance and solves the problem that the existing TPO skin for automobile interior has weak alcohol resistance.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] An alcohol-resistant automobile interior TPO skin comprises a coating, a TPO surface layer and a foaming layer from top to bottom, wherein the coating comprises a surface layer and a base coating in sequence from top to bottom;

[0007] The raw materials of the surface layer include matte water-based polycarbonate polyurethane emulsion, glossy water-based polycarbonate polyurethane emulsion, curing agent, lubricant and defoaming agent; wherein the mass ratio of the matte water-based polycarbonate polyurethane emulsion, the glossy water-based polycarbonate polyurethane emulsion, the curing agent, the lubricant and the defoaming agent is 3:1:(0.24-0.48):(0.24-0.4):(0.012-0.016);

[0008] The raw materials of the primer layer include waterborne polyurethane resin and carbodiimide curing agent; wherein the mass ratio of the waterborne polyurethane resin to the carbodiimide curing agent is 100:(4-6);

[0009] The waterborne polyurethane resin is produced by Japan Dainichi Seika Co., Ltd., and its model is D-2305M.

[0010] The raw material of the TPO surface layer includes ultra-high molecular weight polysiloxane, wherein the mass ratio of the ultra-high molecular weight polysiloxane in the TPO surface layer is 0.05% to 0.2%.

[0011] The ultra-high molecular weight polysiloxane has a weight average molecular weight of 1,000,000 to 2,000,000 and is produced by Leuven, Germany, with a model number of MB150.

[0012] Preferably, the primer layer comprises a first primer layer and a second primer layer;

[0013] The raw materials of the first primer layer include waterborne polyurethane resin and carbodiimide curing agent, wherein the mass ratio of the waterborne polyurethane resin to the carbodiimide curing agent is 100:(4-6);

[0014] The raw materials of the second primer layer include waterborne polyurethane resin and carbodiimide curing agent, wherein the mass ratio of the waterborne polyurethane resin to the carbodiimide curing agent is 100:(4-6);

[0015] The waterborne polyurethane resins used in the first primer layer and the second primer layer are both produced by Japan Dainichi Seika Co., Ltd., with a model number of D-2305M.

[0016] Preferably, in the first primer layer and the second primer layer, the mass ratio of the waterborne polyurethane resin to the carbodiimide curing agent is 100:5, respectively.

[0017] Preferably, the carbodiimide curing agents used in the first primer layer and the second primer layer are both produced by Dainichi Seika Co., Ltd. of Japan, with model number D-501C.

[0018] Preferably, in the surface layer, the mass ratio of the matte water-based polycarbonate polyurethane emulsion, the glossy water-based polycarbonate polyurethane emulsion, the curing agent, the lubricant and the defoaming agent is 3:1:0.4:0.26:0.014.

[0019] Preferably, in the surface layer, the curing agent is an aliphatic isocyanate curing agent, the lubricant is an organosilicon lubricant, and the defoaming agent is a silicon-free defoaming agent.

[0020] Preferably, in the surface layer, the matte water-based polycarbonate polyurethane emulsion is produced by Stahl Company of Germany, model number WF-77-648;

[0021] The bright water-based polycarbonate polyurethane emulsion is produced by Stahl, Germany, and its model is RU-13-085;

[0022] The aliphatic isocyanate curing agent is produced by Stahl Company of Germany, model number is XR-28-404;

[0023] The organosilicon lubricant is produced by Stahl, Germany, and its model is HM-13-678;

[0024] The silicon-free defoamer is produced by Stahl AG of Germany and its model number is DF-2459.

[0025] Preferably, the surface layer is provided with multiple layers.

[0026] The technical solution provided by the embodiments of the present application may have the following beneficial effects:

[0027] 1. The raw materials of the primer layer of the technical solution include a water-based polyurethane resin and a carbodiimide curing agent in a mass ratio of 100: (4-6), and the water-based polyurethane resin is a water-based polyurethane resin of model D-2305M produced by Dainichi Seika Co., Ltd. of Japan. The technical solution can effectively improve the adhesion between the primer layer and the TPO surface layer through a special combination of raw materials, so that the entire coating is not easy to break and fall off, thereby effectively improving the tolerance of the coating to alcohol solvents and improving the alcohol resistance of the TPO surface of the automotive interior. At the same time, through the synergistic effect of the raw materials in the surface layer of the technical solution, it can effectively improve The uniform leveling property of the coating surface makes the coating surface smoother and reduces the friction between the coating surface and alcohol when wiping; the raw materials of the TPO surface layer include 0.05% to 0.2% ultra-high molecular weight polysiloxane with PP or PE as the carrier, and the ultra-high molecular weight polysiloxane is produced by Germany's Lei Fuss Company, model MB150. By using ultra-high molecular weight polysiloxane with PP or PE as the carrier, the oil precipitation of the TPO surface layer can be suppressed, and the precipitated oil can penetrate between the TPO surface layer and the base coating, which reduces the adhesion of the base coating and causes the coating to fall off when wiping with alcohol. When wiping with alcohol, the damage of alcohol to the coating is further reduced to further improve the alcohol resistance. The automotive interior TPO surface of the present technical solution was wiped 10 times with 99.5% alcohol at a force of 9N. There was no abnormal phenomenon such as whitening or damage on the surface of the automotive interior TPO surface, and the color change was ≥ level 4 and the color staining was ≥ level 4. It can be seen that the automotive interior TPO surface of the present technical solution has good alcohol resistance.

[0028] 2. This technical solution can significantly improve the alcohol resistance of the automotive interior TPO surface through the synergistic effect of the surface layer, the base coat and the TPO surface layer. If the surface of the automotive interior TPO surface of this technical solution is dirty during the product assembly and after-sales process, you can safely use alcohol to wipe and clean the surface dirt, and you can also safely use alcohol to disinfect the interior of the car without affecting the appearance of the product. At the same time, the coating of this technical solution abandons the previous solvent-based middle layer, and the main raw materials used in the surface layer and the base coat are water-based polyurethane materials, which makes the automotive interior TPO surface have lower VOC volatility and lower odor emission, effectively improving the air quality in the car. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a rendering of the alcohol-resistant automotive interior TPO surface of Example 1 of the present invention after alcohol resistance testing;

[0030] Figure 2 This is a rendering of the automotive interior TPO surface of Comparative Example 1 after alcohol resistance testing;

[0031] Figure 3This is a picture showing the effect of the automotive interior TPO surface of Comparative Example 2 after the alcohol resistance test. DETAILED DESCRIPTION

[0032] In order to facilitate the understanding of the present invention, the present invention is described more fully below. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0033] If no specific techniques or conditions are specified in the examples, the techniques or conditions described in the literature in the field or the product instructions are used. Raw materials used without specifying the manufacturer are all conventional products that can be obtained through commercial purchase.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0035] The technical solution of the present invention is further explained below in conjunction with specific implementation methods.

[0036] An alcohol-resistant automobile interior TPO skin comprises a coating, a TPO surface layer and a foaming layer from top to bottom, wherein the coating comprises a surface layer and a base coating in sequence from top to bottom;

[0037] The raw materials of the surface layer include matte water-based polycarbonate polyurethane emulsion, glossy water-based polycarbonate polyurethane emulsion, curing agent, lubricant and defoaming agent; wherein the mass ratio of the matte water-based polycarbonate polyurethane emulsion, the glossy water-based polycarbonate polyurethane emulsion, the curing agent, the lubricant and the defoaming agent is 3:1:(0.24-0.48):(0.24-0.4):(0.012-0.016);

[0038] The raw materials of the primer layer include waterborne polyurethane resin and carbodiimide curing agent; wherein the mass ratio of the waterborne polyurethane resin to the carbodiimide curing agent is 100:(4-6);

[0039] The waterborne polyurethane resin is produced by Japan Dainichi Seika Co., Ltd., and its model is D-2305M.

[0040] It is worth noting that the raw materials of the base coat of the present technical solution include a water-based polyurethane resin and a carbodiimide curing agent in a mass ratio of 100: (4-6), and the water-based polyurethane resin is a water-based polyurethane resin produced by Dainichi Seika Co., Ltd. of Japan, model D-2305M. The present technical solution can effectively improve the adhesion between the base coat and the TPO surface layer through a special combination of raw materials, so that the entire coating is not easy to be damaged and fall off, thereby effectively improving the coating's tolerance to alcohol solvents and improving the alcohol resistance of the automotive interior TPO surface. At the same time, through the synergistic effect of the raw materials in the surface layer of the present technical solution, the uniform leveling of the coating surface can be effectively improved, making the coating surface smoother, reducing the friction between the coating surface and the alcohol when wiping, and further reducing the damage of alcohol to the coating when wiping with alcohol, so as to achieve the effect of further improving the alcohol resistance. The automotive interior TPO surface of the present technical solution was wiped 10 times with 99.5% alcohol at a force of 9N. There was no abnormal phenomenon such as whitening or damage on the surface of the automotive interior TPO surface, and the color change was ≥ level 4 and the color staining was ≥ level 4. It can be seen that the automotive interior TPO surface of the present technical solution has good alcohol resistance.

[0041] The raw material of the TPO surface layer includes ultra-high molecular weight polysiloxane, wherein the mass ratio of the ultra-high molecular weight polysiloxane in the TPO surface layer is 0.05% to 0.2%.

[0042] The ultra-high molecular weight polysiloxane has a weight average molecular weight of 1,000,000 to 2,000,000 and is produced by Leuven, Germany, with a model number of MB150.

[0043] The raw materials of the TPO surface layer of the technical solution include 0.05% to 0.2% of ultra-high molecular weight polysiloxane with PP or PE as carrier, and the ultra-high molecular weight polysiloxane is produced by Germany's Lei Fuss Company, model MB150. By using ultra-high molecular weight polysiloxane with PP or PE as carrier, the oil precipitation of the TPO surface layer can be suppressed, and the precipitated oil can penetrate between the TPO surface layer and the base coat, so that the adhesion of the base coat decreases, and the coating falls off when wiped with alcohol, thereby improving the alcohol resistance of the TPO surface of the automotive interior. If the molecular weight of the polysiloxane used is less than 1000000, the TPO surface layer will still have the problem of oil precipitation. If the molecular weight of the polysiloxane used is greater than 2000000, it will lead to poor compatibility between materials and uneven plasticization.

[0044] This technical solution can significantly improve the alcohol resistance of the automotive interior TPO surface through the synergistic effect of the surface layer, the base coat and the TPO surface layer. Therefore, during the product assembly and after-sales process, if the surface of the automotive interior TPO surface of this technical solution is dirty, you can safely use alcohol to wipe and clean the surface dirt, and you can also safely use alcohol to disinfect the interior of the car without affecting the appearance of the product. At the same time, the coating of this technical solution abandons the previous solvent-based middle layer, and the main raw materials used in the surface layer and the base coat are water-based polyurethane materials, which makes the automotive interior TPO surface have lower VOC volatility and lower odor emission, effectively improving the air quality in the car.

[0045] Further explanation, in the base coating of the present technical solution, the mass ratio of the waterborne polyurethane resin and the carbodiimide curing agent is 100: (4-6). Within this ratio, the adhesion between the base coating and the TPO surface layer can be significantly improved, so that the entire coating is not easy to be damaged or fall off after being wiped with alcohol, thereby improving the alcohol resistance of the TPO surface of the automotive interior. If the proportion of the carbodiimide curing agent in the base coating is too small, the base coating curing rate will slow down or even fail to fully cure, resulting in waste; if the proportion of the carbodiimide curing agent in the base coating is too large, the coating will easily harden and crack in the later stage, resulting in a decrease in alcohol resistance.

[0046] Specifically, in the technical scheme, the mass ratio of the matte water-based polycarbonate polyurethane emulsion, the glossy water-based polycarbonate polyurethane emulsion, the curing agent, the lubricant and the defoaming agent in the surface layer is 3:1: (0.24-0.48): (0.24-0.4): (0.012-0.016), the matte water-based polycarbonate polyurethane emulsion is the main agent of the matte slurry in the surface layer, and the glossy water-based polycarbonate polyurethane emulsion is the glossy slurry in the surface layer. By controlling the mass ratio of the matte water-based polycarbonate polyurethane emulsion and the glossy water-based polycarbonate polyurethane emulsion to 3:1, the matteness of the surface layer can be controlled, so that the surface glossiness of the prepared automotive interior TPO skin product is better. The addition limit of lubricant in the surface layer can avoid the increase of dryness in the surface layer, loss of smoothness on contact, and avoid affecting the leveling effect of the product; the addition limit of defoaming agent in the surface layer can ensure the defoaming effect and ensure that it will not cause erosion to the equipment.

[0047] It should be noted that the TPO surface layer and foaming layer of the present technical solution are prepared by using conventional formulas and processes in the art, and therefore this solution is not further limited.

[0048] Further explanation, the primer layer includes a first primer layer and a second primer layer;

[0049] The raw materials of the first primer layer include waterborne polyurethane resin and carbodiimide curing agent, wherein the mass ratio of the waterborne polyurethane resin to the carbodiimide curing agent is 100:(4-6);

[0050] The raw materials of the second primer layer include waterborne polyurethane resin and carbodiimide curing agent, wherein the mass ratio of the waterborne polyurethane resin to the carbodiimide curing agent is 100:(4-6);

[0051] The waterborne polyurethane resins used in the first primer layer and the second primer layer are both produced by Japan Dainichi Seika Co., Ltd., with a model number of D-2305M.

[0052] It is worth noting that the primer layer of the present technical solution is provided with two layers, namely the first primer layer and the second primer layer. The raw material composition and ratio of the first primer layer and the second primer layer are the same. By providing two layers of primer layers, the adhesion between the TPO surface layer and the primer layer can be further improved, thereby improving the tolerance of the entire coating to alcohol and improving the alcohol resistance of the TPO surface of the automotive interior.

[0053] Preferably, the coating amount of each primer layer is 15-25 g / ㎡, and the thickness is 8-16 μm. The technical solution forms two primer layers by coating twice respectively, and makes each primer layer thinner by controlling the coating amount and thickness. The thin and multi-layer coating can ensure the elasticity of the cured coating and the high elongation of the cured coating. If a single-layer thick coating is used for coating, the coating will have insufficient elasticity after curing, resulting in cracks when the coating is deformed.

[0054] More preferably, the coating amount of the first primer layer and the second primer layer are both 18 g / ㎡, and the thickness are both 12 μm.

[0055] Further explanation, in the first primer layer and the second primer layer, the mass ratio of the waterborne polyurethane resin to the carbodiimide curing agent is 100:5 respectively.

[0056] Preferably, in an optimal embodiment of the present invention, the mass ratio of the waterborne polyurethane resin to the carbodiimide curing agent is 100:5. Under this ratio, the adhesion between the primer layer and the TPO surface layer is strong, and the curing rate of the primer layer is fast.

[0057] Further explanation: the carbodiimide curing agents used in the first primer layer and the second primer layer are both produced by Dainichi Seika Co., Ltd. of Japan, with the model number being D-501C.

[0058] Specifically, in one embodiment of the present invention, the carbodiimide curing agent is selected from Japan Dainichi Chemical Co., Ltd., model D-501C, which is used as a base coating curing agent. D-501C has low viscosity, is strongly alkaline, has a harder texture, and can promote the rapid curing of waterborne polyurethane resin (D-2305M).

[0059] Further description, in the surface layer, the mass ratio of the matte water-based polycarbonate polyurethane emulsion, the glossy water-based polycarbonate polyurethane emulsion, the curing agent, the lubricant and the defoaming agent is 3:1:0.4:0.26:0.014.

[0060] Preferably, in an optimal embodiment of the present invention, the mass ratio of the matte water-based polycarbonate polyurethane emulsion, the glossy water-based polycarbonate polyurethane emulsion, the curing agent, the lubricant and the defoaming agent is 3:1:0.4:0.26:0.014. The surface layer obtained by adopting this ratio has high flatness and good wear resistance.

[0061] Further description, in the surface layer, the curing agent is an aliphatic isocyanate curing agent, the lubricant is an organic silicon lubricant, and the defoaming agent is a silicon-free defoaming agent.

[0062] Further explanation, in the surface layer, the matte water-based polycarbonate polyurethane emulsion is produced by Stahl Company of Germany, model number WF-77-648;

[0063] The bright water-based polycarbonate polyurethane emulsion is produced by Stahl, Germany, and its model is RU-13-085;

[0064] The aliphatic isocyanate curing agent is produced by Stahl Company of Germany, model number is XR-28-404;

[0065] The organosilicon lubricant is produced by Stahl, Germany, and its model is HM-13-678;

[0066] The silicon-free defoamer is produced by Stahl AG of Germany and its model number is DF-2459.

[0067] It is worth noting that this technical solution can effectively improve the uniformity and leveling of the coating layer after coating through the combination of specific raw materials, so that the unevenness of the microscopic lower layer surface is more uniform, the coating surface is smoother, and the friction of the flat surface is reduced, so that the loss of the protruding part after friction is as small as possible, so as to achieve the effect of improving alcohol resistance, and at the same time, it can effectively improve the wear resistance of the coating. The wear resistance test was carried out under the test conditions of 500g load, CS10 grinding wheel and 500 rpm / 1000 rpm. The results show that the wear resistance of the coating surface of this solution is OK (that is, there are no cracks on the surface after the wear resistance test, no damage to the surface coating, and other undesirable phenomena, and it meets the color fastness rating of level 4 in the GB / T 250 standard).

[0068] The matte water-based polycarbonate polyurethane emulsion of this technical solution is the main agent of the matte slurry in the surface layer. This technical solution uses WF-77-648 from Germany's Stahl Company, which can adjust the comprehensive performance of the product, such as the glossiness, moldability of the coating during production, and smoothness after film formation. The bright water-based polycarbonate polyurethane emulsion is the main agent of the glossy slurry of the surface layer. This technical solution uses RU-13-085 from Germany's Stahl Company, which can adjust the glossiness of the product when used with WF-77-648. The aliphatic isocyanate curing agent in the surface layer uses XR-28-404 from Germany's Stahl Company, which can help the surface layer to cure quickly and effectively improve production efficiency. The silicone lubricant in the surface layer of this technical solution uses HM-13-678 from Germany's Stahl Company, which can enhance the smoothness of the coating surface. The silicon-free defoaming agent in the surface layer of this technical solution uses DF-2459 from Germany's Stahl Company, which can eliminate bubbles in the slurry during the production process and avoid abnormal problems caused by bubbles in the production process.

[0069] As a further explanation, the surface layer is provided with multiple layers, and the multiple surface layers are formed by coating multiple times in sequence.

[0070] Preferably, the technical solution can significantly improve the flatness of the coating surface by providing two surface layers, thereby achieving the effect of further improving alcohol resistance and wear resistance.

[0071] In one embodiment of the present invention, a method for preparing an alcohol-resistant automotive interior TPO skin comprises the following steps: heating and mixing the raw materials of the TPO surface layer evenly, producing the TPO surface layer by a calendering method; mixing the raw materials of the surface layer and the base coating layer respectively to obtain a surface layer slurry and a base coating layer slurry respectively, and coating the base coating layer slurry and the surface layer slurry evenly on the TPO membrane in sequence by roller coating to obtain a surface layer and a base coating layer; printing a pattern on the TPO surface layer by high-temperature extrusion, and heat-sealing the TPO surface layer and the foaming layer together to obtain an alcohol-resistant automotive interior TPO skin.

[0072] Example 1

[0073] An alcohol-resistant automobile interior TPO skin comprises, from top to bottom, a coating, a TPO surface layer and a foaming layer, wherein the coating comprises, from top to bottom, a surface layer and a primer layer, wherein the surface layer and the primer layer are respectively provided with two layers, the two surface layers are respectively a first surface layer and a second surface layer, and the two primer layers are respectively a first primer layer and a second primer layer, that is, the alcohol-resistant automobile interior TPO skin of this embodiment comprises, from top to bottom, a first surface layer, a second surface layer, a first primer layer, a second primer layer, a TPO surface layer and a foaming layer;

[0074] The raw material composition and proportion of the first surface layer and the second surface layer are the same. The raw materials of the first surface layer and the second surface layer respectively include matte water-based polycarbonate polyurethane emulsion (Stahl WF-77-648), glossy water-based polycarbonate polyurethane emulsion (Stahl RU-13-085), aliphatic isocyanate curing agent (Stahl XR-28-404), silicone lubricant (Stahl HM-13-678) and silicone-free defoaming agent (Stahl DF-2459), wherein the mass ratio of matte water-based polycarbonate polyurethane emulsion, glossy water-based polycarbonate polyurethane emulsion, aliphatic isocyanate curing agent, silicone lubricant and silicone-free defoaming agent is 3:1:0.4:0.26:0.014;

[0075] The raw material composition and ratio of the first primer layer and the second primer layer are the same. The raw materials of the first primer layer and the second primer layer respectively include water-based polyurethane resin (Dainichi Chemical D-2305M), carbodiimide curing agent (Dainichi Chemical D-501C) and ultra-high molecular weight polysiloxane (Levos MB150); wherein the mass ratio of the water-based polyurethane resin to the carbodiimide curing agent is 100:5;

[0076] The raw materials of the TPO surface layer include TPV, RTPO, polyethylene, RPP and ultra-high molecular weight polysiloxane (LEVOSS MB150); among them, the mass ratio of TPV, RTPO, polyethylene, RPP and ultra-high molecular weight polysiloxane is 60:20:5:14:1.

[0077] The foaming layer is a cross-linked polyolefin foam.

[0078] Example 2

[0079] An alcohol-resistant automobile interior TPO skin comprises, from top to bottom, a coating, a TPO surface layer and a foaming layer, wherein the coating comprises, from top to bottom, a surface layer and a primer layer, wherein the surface layer and the primer layer are respectively provided with two layers, the two surface layers are respectively a first surface layer and a second surface layer, and the two primer layers are respectively a first primer layer and a second primer layer, that is, the alcohol-resistant automobile interior TPO skin of this embodiment comprises, from top to bottom, a first surface layer, a second surface layer, a first primer layer, a second primer layer, a TPO surface layer and a foaming layer;

[0080] The raw material composition and proportion of the first surface layer and the second surface layer are the same. The raw materials of the first surface layer and the second surface layer respectively include matte water-based polycarbonate polyurethane emulsion (Stahl WF-77-648), glossy water-based polycarbonate polyurethane emulsion (Stahl RU-13-085), aliphatic isocyanate curing agent (Stahl XR-28-404), silicone lubricant (Stahl HM-13-678) and silicone-free defoaming agent (Stahl DF-2459), wherein the mass ratio of matte water-based polycarbonate polyurethane emulsion, glossy water-based polycarbonate polyurethane emulsion, aliphatic isocyanate curing agent, silicone lubricant and silicone-free defoaming agent is 3:1:0.48:0.32:0.016;

[0081] The raw material composition and ratio of the first primer layer and the second primer layer are the same. The raw materials of the first primer layer and the second primer layer respectively include water-based polyurethane resin (Dainichi Seika D-2305M) and carbodiimide curing agent (Dainichi Seika D-501C); wherein the mass ratio of the water-based polyurethane resin to the carbodiimide curing agent is 100:6;

[0082] The raw materials of the TPO surface layer include TPV, RTPO, polyethylene, RPP and ultra-high molecular weight polysiloxane (LEVOSS MB150); among them, the mass ratio of TPV, RTPO, polyethylene, RPP and ultra-high molecular weight polysiloxane is 60:20:5:14:1.

[0083] The foaming layer is radiation cross-linked polypropylene foam.

[0084] Example 3

[0085] An alcohol-resistant automobile interior TPO skin comprises, from top to bottom, a coating, a TPO surface layer and a foaming layer, wherein the coating comprises, from top to bottom, a surface layer and a primer layer, wherein the surface layer and the primer layer are respectively provided with two layers, the two surface layers are respectively a first surface layer and a second surface layer, and the two primer layers are respectively a first primer layer and a second primer layer, that is, the alcohol-resistant automobile interior TPO skin of this embodiment comprises, from top to bottom, a first surface layer, a second surface layer, a first primer layer, a second primer layer, a TPO surface layer and a foaming layer;

[0086] The raw material composition and proportion of the first surface layer and the second surface layer are the same. The raw materials of the first surface layer and the second surface layer respectively include matte water-based polycarbonate polyurethane emulsion (Stahl WF-77-648), glossy water-based polycarbonate polyurethane emulsion (Stahl RU-13-085), aliphatic isocyanate curing agent (Stahl XR-28-404), silicone lubricant (Stahl HM-13-678) and silicone-free defoaming agent (Stahl DF-2459), wherein the mass ratio of matte water-based polycarbonate polyurethane emulsion, glossy water-based polycarbonate polyurethane emulsion, aliphatic isocyanate curing agent, silicone lubricant and silicone-free defoaming agent is 3:1:0.24:0.24:0.012;

[0087] The raw material composition and ratio of the first primer layer and the second primer layer are the same. The raw materials of the first primer layer and the second primer layer respectively include water-based polyurethane resin (Dainichi Seika D-2305M) and carbodiimide curing agent (Dainichi Seika D-501C); wherein the mass ratio of the water-based polyurethane resin to the carbodiimide curing agent is 100:4;

[0088] The raw materials of the TPO surface layer include TPV, RTPO, polyethylene, RPP and ultra-high molecular weight polysiloxane (LEVOSS MB150); among them, the mass ratio of TPV, RTPO, polyethylene, RPP and ultra-high molecular weight polysiloxane is 60:20:5:14:1.

[0089] The foaming layer is radiation cross-linked polypropylene foam.

[0090] Comparative Example 1

[0091] The comparative example automobile interior TPO skin comprises, from top to bottom, a first surface layer, a second surface layer, a first primer layer, a second primer layer, a TPO surface layer and a foaming layer;

[0092] The raw material of the second primer layer is HM-21-643 from Stahl Company of Germany;

[0093] The raw materials and proportions of the first primer layer are as follows: surface matte paste main agent (Stahl WD-78-643): surface gloss paste main agent (Stahl RU-13-648): surface feel agent (Stahl HM-13-678): surface defoamer (Stahl DF-2459): surface leveling agent (Stahl LA-91-120): surface curing agent (Stahl XR-28-404): surface polycarbonate curing agent (Stahl XR-5580) = 80:20:6.5:0.3:1:10:3 (mass ratio);

[0094] The raw materials and proportions of the second surface layer are as follows: surface matte paste main agent (Stahl WD-78-643): surface gloss paste main agent (Stahl RU-13-648): surface feel agent (Stahl HM-13-678): surface defoamer (Stahl DF-2459): surface leveling agent (Stahl LA-91-120): surface curing agent (Stahl XR-28-404): surface polycarbonate curing agent (Stahl XR-5580) = 80:20:6.5:0.3:1:10:3 (mass ratio);

[0095] The raw materials and proportions of the first surface layer are as follows: surface matte paste main agent (Stahl WD-78-643): surface gloss paste main agent (Stahl RU-13-648): surface feel agent (Stahl HM-13-678): surface defoamer (Stahl DF-2459): surface leveling agent (Stahl LA-91-120): surface curing agent (Stahl XR-28-404): surface polycarbonate curing agent (Stahl XR-5580) = 90:10:6.5:0.3:1:10:3;

[0096] The raw materials of the TPO surface layer include TPV, RTPO, polyethylene and RPP; among them, the mass ratio of TPV, RTPO, polyethylene, RPP and ultra-high molecular weight polysiloxane is 60:20:5:15.

[0097] The foaming layer is radiation cross-linked polypropylene foam.

[0098] Comparative Example 2

[0099] The comparative example automobile interior TPO skin comprises, from top to bottom, a first surface layer, a second surface layer, a first primer layer, a second primer layer, a TPO surface layer and a foaming layer;

[0100] The raw material composition and ratio of the first primer layer and the second primer layer are the same. The raw materials of the first primer layer and the second primer layer respectively include water-based polyurethane resin (Dainichi Seika D-2305M) and carbodiimide curing agent (Dainichi Seika D-501C); wherein the mass ratio of the water-based polyurethane resin to the carbodiimide curing agent is 100:5;

[0101] The raw material composition and proportion of the first surface layer are as follows: main agent of matte paste of surface layer (Dainichi Seika D-5519M): main agent of gloss paste of surface layer (Dainichi Seika D-5520SG): hard curing agent of surface layer (Dainichi Seika D-501C): soft curing agent of surface layer (Dainichi Seika D-59C) = 10:1:0.297:0.242; the raw material composition and proportion of the second surface layer are the same as those of the first surface layer;

[0102] The raw materials of the TPO surface layer include TPV, RTPO, polyethylene and RPP; among them, the mass ratio of TPV, RTPO, polyethylene, RPP and ultra-high molecular weight polysiloxane is 60:20:5:15.

[0103] The foaming layer is radiation cross-linked polypropylene foam.

[0104] Specifically, the alcohol-resistant automobile interior TPO skins of Examples 1-3 and the automobile interior TPO skins of Comparative Examples 1-2 were subjected to alcohol resistance tests and abrasion resistance tests, respectively.

[0105] Among them, according to the ISO 105-X12-2016 textile color fastness test standard - automotive interior door panel instrument panel alcohol resistance requirements, the test requirements are as follows:

[0106] Sample size: 50mm×200mm

[0107] Fabric: 50mm×50mm 3# white cotton cloth

[0108] Load: 9N

[0109] Stroke: 100mm

[0110] Number of times: 10 times

[0111] Alcohol concentration: ≥99.5% alcohol.

[0112] The wear resistance test method is as follows: use a CS10 grinding wheel to grind the surface of the epidermis for 500 turns under a load of 500g. If there are no cracks on the surface of the TPO epidermis, the surface coating is not damaged, and there is no obvious change in the surface texture, color and gloss after the wear resistance test, it is judged to be OK in wear resistance; if any of the following defects appear on the TPO epidermis after the wear resistance test, it is judged to be NG in wear resistance: cracks, coating damage, obvious changes in surface texture, color or gloss.

[0113] The adhesion test method is carried out in accordance with GB / T 9286-2021, and the grading standard of the adhesion test results is as follows: "0" corresponds to a completely smooth cutting edge without any peeling; "1" corresponds to a small amount of coating peeling off at the intersection of the cuts, but the affected cross-cut area cannot be significantly greater than 5%; "2" corresponds to coating peeling off at the intersection of the cuts and / or along the edges of the cuts, and the affected cross-cut area is significantly greater than 5%, but not significantly greater than 15%; "3" corresponds to partial or complete peeling of the coating in large fragments along the cutting edge, and / or partial or complete peeling off at different parts of the grid, and the affected cross-cut area is significantly greater than 15%, but not significantly greater than 35%.

[0114] The test results of Examples 1-3 and Comparative Examples 1-2 are shown in Table 1 below:

[0115] Table 1 Test results

[0116]

[0117] At the same time, the results of alcohol resistance test of Example 1, Comparative Example 1 and Comparative Example 2 are shown as follows: Figure 1 , Figure 2 and Figure 3 shown.

[0118] From Table 1 and Figure 1-3 It can be seen from the test results that the alcohol-resistant automotive interior TPO epidermis of Examples 1-3 has good alcohol resistance. After wiping with 99.5% alcohol 10 times, there is no abnormal phenomenon such as whitening and damage on the surface of the epidermis, the discoloration is ≥ level 4, and the staining is ≥ level 4. In addition, Example 1 has the best alcohol resistance, with a discoloration of level 4.5 and a staining of level 5. At the same time, the alcohol-resistant automotive interior TPO epidermis of Examples 1-3 has good wear resistance. After the wear resistance test, there are no cracks on the surface of the TPO epidermis, the coating is not damaged, and the surface texture, color and glossiness have no obvious changes.

[0119] From Table 1 and Figure 2 It can be seen from the test results that the alcohol resistance of the automotive interior TPO surface of Comparative Example 1 is very poor. After wiping with 99.5% alcohol for 10 times, the surface coating is severely damaged and the surface is severely whitened. Although LA-90-120 (leveling agent) is added to the coating system of Comparative Example 1, and its components are an acrylate homopolymer and copolymer, silicone-modified acrylate polymer, etc., and although LA-90-120 (leveling agent) is added to the coating to make the coating surface smoother, the treatment agent used in the second primer layer of Comparative Example 1 is an existing conventional substrate bonding treatment agent, so that the adhesion between the second primer layer and the TPO surface layer is insufficient. Since alcohol is a solvent-type substance, it can penetrate the first surface layer, the second surface layer and the first primer layer, and reach the second primer layer, thereby dissolving or softening the second primer layer, so the coating begins to be damaged internally, causing the coating to be damaged and peeled off, resulting in whitening.

[0120] From the test results of comparative example 2, it can be seen that the alcohol resistance of the automotive interior TPO skin of comparative example 2 is also good, but the wear resistance of comparative example 2 is poor. Therefore, from the above performance test results, it can be seen that the alcohol resistance mainly depends on the base coating. When the adhesion of the base coating is strong, the alcohol resistance of the automotive interior TPO skin is good.

[0121] The technical principle of the present invention is described above in conjunction with specific embodiments. These descriptions are only for explaining the principle of the present invention and cannot be interpreted as limiting the scope of protection of the present invention in any way. Based on the explanations herein, those skilled in the art can associate other specific implementations of the present invention without paying creative labor, and these methods will fall within the scope of protection of the present invention.

Claims

1. An alcohol-resistant automotive interior TPO skin, characterized in that: It includes a coating layer, a TPO surface layer and a foaming layer from top to bottom, wherein the coating layer includes a surface layer and a base coating layer from top to bottom in sequence; The raw materials of the surface layer include matte water-based polycarbonate polyurethane emulsion, glossy water-based polycarbonate polyurethane emulsion, curing agent, lubricant and defoaming agent; wherein the mass ratio of the matte water-based polycarbonate polyurethane emulsion, the glossy water-based polycarbonate polyurethane emulsion, the curing agent, the lubricant and the defoaming agent is 3:1:(0.24-0.48):(0.24-0.4):(0.012-0.016); The raw materials of the primer layer include waterborne polyurethane resin and carbodiimide curing agent; wherein the mass ratio of the waterborne polyurethane resin to the carbodiimide curing agent is 100:(4-6).

2. The alcohol-resistant automotive interior TPO skin according to claim 1, characterized in that: The waterborne polyurethane resin is produced by Japan Dainichi Seika Co., Ltd., and its model is D-2305M.

3. The alcohol-resistant automotive interior TPO skin according to claim 1, characterized in that: The raw material of the TPO surface layer includes ultra-high molecular weight polysiloxane, wherein the mass ratio of the ultra-high molecular weight polysiloxane in the TPO surface layer is 0.05% to 0.2%.

4. The alcohol-resistant automotive interior TPO skin according to claim 3, characterized in that: The ultra-high molecular weight polysiloxane has a weight average molecular weight of 1,000,000 to 2,000,000 and is produced by Leuven, Germany, with a model number of MB150.

5. The alcohol-resistant automotive interior TPO skin according to claim 1, characterized in that: The primer layer includes a first primer layer and a second primer layer; The raw materials of the first primer layer include waterborne polyurethane resin and carbodiimide curing agent, wherein the mass ratio of the waterborne polyurethane resin to the carbodiimide curing agent is 100:(4-6); The raw materials of the second primer layer include waterborne polyurethane resin and carbodiimide curing agent, wherein the mass ratio of the waterborne polyurethane resin to the carbodiimide curing agent is 100:(4-6); The waterborne polyurethane resins used in the first primer layer and the second primer layer are both produced by Japan Dainichi Seika Co., Ltd., with a model number of D-2305M.

6. The alcohol-resistant automotive interior TPO skin according to claim 3, characterized in that: In the first primer layer and the second primer layer, the mass ratio of the waterborne polyurethane resin to the carbodiimide curing agent is 100:5 respectively; The carbodiimide curing agents used in the first primer layer and the second primer layer are both produced by Dainichi Seika Co., Ltd. of Japan, with the model number being D-501C.

7. The alcohol-resistant automotive interior TPO skin according to claim 3, characterized in that: The coating amounts of the first primer layer and the second primer layer are 15 to 25 g / ㎡, and the thicknesses are 8 to 16 μm, respectively.

8. The alcohol-resistant automotive interior TPO skin according to claim 1, characterized in that: In the surface layer, the mass ratio of the matte water-based polycarbonate polyurethane emulsion, the glossy water-based polycarbonate polyurethane emulsion, the curing agent, the lubricant and the defoaming agent is 3:1:0.4:0.26:0.

014.

9. The alcohol-resistant automotive interior TPO skin according to claim 1, characterized in that: In the surface layer, the curing agent is an aliphatic isocyanate curing agent, the lubricant is an organic silicon lubricant, and the defoaming agent is a silicon-free defoaming agent; In the surface layer, the matte water-based polycarbonate polyurethane emulsion is produced by Stahl Company of Germany, with the model number of WF-77-648; The bright water-based polycarbonate polyurethane emulsion is produced by Stahl, Germany, and its model is RU-13-085; The aliphatic isocyanate curing agent is produced by Stahl Company of Germany, model number is XR-28-404; The organosilicon lubricant is produced by Stahl, Germany, and its model is HM-13-678; The silicon-free defoamer is produced by Stahl AG of Germany and its model number is DF-2459.

10. The alcohol-resistant automotive interior TPO skin according to claim 1, characterized in that: The surface layer is provided with multiple layers.

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