High hiding power PP conductive and light-transmitting primer coating and preparation method and application thereof

Abstract

The application discloses a high-hiding PP conductive and light-transmitting primer coating and a preparation method and application thereof. The acrylic modified polyolefin resin and the acrylic resin in the primer coating have hydrophilic polar groups, the hydrophilic polar groups migrate to the non-polar PP substrate surface after spraying, the polarity, contact angle and surface energy of the PP substrate surface are changed, the adhesion between the primer coating and the PP substrate is increased, meanwhile, the modified chlorinated polyolefin main chain is engaged with the PP substrate through dispersion force and has a strong interaction with the acrylic resin, thereby good adhesion and flexibility are provided, the conductive carbon black has conductive and light-absorbing properties, high hiding power is provided based on the refractive effect of titanium dioxide and fillers, the acrylic resin can effectively wrap the conductive carbon black, titanium dioxide and fillers, the resin compatibility is improved, the pigment coating is uniformly dispersed in the primer coating, and thus good adhesion and laser engraving performance are provided.

Description

Technical Field

[0001] This invention relates to the field of coating technology, and in particular to a high-coverage PP conductive and transparent primer coating, its preparation method, and its application. Background Technology

[0002] In existing technologies, new energy vehicles differ from traditional vehicles. New energy vehicles rely entirely on electricity for propulsion and no longer use grilles for heat dissipation. Therefore, their exterior design no longer considers heat dissipation grilles. To achieve auxiliary signal lights or autonomous driving voice communication, light signals need to be integrated into other parts of the vehicle, such as the bumper. Integrating light elements into the bumper not only meets these requirements but also maintains the overall aesthetics of the vehicle. However, traditional bumpers are made of black polypropylene, which contains many fillers, thus failing to achieve light transmission and preventing direct light intake. Therefore, if light needs to be integrated into the bumper, a translucent material, such as transparent PP, must be selected. In view of this, this application provides a high-opacity conductive and translucent PP primer coating, which can not only meet the output of different light source signals on transparent PP bumpers but also be applied to other similar scenarios, possessing broad market prospects. Summary of the Invention

[0003] To address the aforementioned technical problems, this invention provides a high-coverage PP conductive and translucent primer coating, comprising the following components by weight percentage:

[0004] Acrylic-modified polyolefin resin 20-40%

[0005] 10-20% acrylic resin

[0006] Adhesion promoter 2-6%

[0007] Titanium dioxide 15-30%

[0008] Conductive carbon black 1-4%

[0009] Wetting and dispersing agent 1-4%

[0010] Anti-settling agent 0.2-0.8%

[0011] Leveling agent 0.2-0.6%

[0012] Solvent 20-40%,

[0013] The acrylic resin is one of 2-phenoxyethyl acrylate, ethoxyethoxy acrylate and ethoxybisphenol A dimethacrylate, the adhesion promoter is a modified chlorinated polyolefin and a polysiloxane-free polymer compound, and the solvent is a mixture of toluene, xylene, propylene glycol methyl ether acetate, ethyl ethoxypropionate and butyl acetate.

[0014] Preferably, the solvent comprises the following components by weight percentage: 3-8% toluene, 5-15% xylene, 3-8% propylene glycol methyl ether acetate, 3-6% ethyl ethoxypropionate, and 3-6% butyl acetate.

[0015] Preferably, the modified chlorinated polyolefin is at least one of F-2P, 526P, CP343-3 and CP730-1, and the polysiloxane-free polymer is APC.

[0016] Preferably, the conductive carbon black is at least one of XE2B and XC72.

[0017] Preferably, the titanium dioxide is at least one of R996, R818, R706, R902 and FT-3000.

[0018] Preferably, the wetting and dispersing agent is at least one of EFKA-4310, BYK163, BYK161, EFKA-4010, and BYK-104S.

[0019] Preferably, the anti-settling agent is at least one of R972, H2000, R974 and A200.

[0020] Preferably, the leveling agent is at least one of BYK306, BYK358N, EFKA-FL3777, and AFCONA-3700.

[0021] This invention also provides a method for preparing a high-coverage PP conductive and translucent primer coating. The method, used to prepare the aforementioned high-coverage PP conductive and translucent primer coating, includes at least the following steps:

[0022] S1. Add acrylic modified polyolefin resin, acrylic resin, xylene and wetting and dispersing agent to a dispersion container and disperse evenly to obtain mixture A, wherein the dispersion speed is 500-600 rpm;

[0023] S2. Add conductive carbon black, titanium dioxide and anti-settling agent to the mixture A in sequence, and stir and disperse during the addition process. After uniform dispersion, grind the mixture to a fineness of less than 10μm using a sand mill to obtain mixture B, wherein the dispersion speed is 800-1200 rpm.

[0024] S3. Under the condition of a rotation speed of 300-500 rpm, add the adhesion promoter, toluene and leveling agent to the mixture B in sequence and disperse them. After the addition is completed, increase the dispersion speed to 800-1000 rpm until the dispersion is uniform, and a high hiding power PP conductive and light-transmitting primer coating is obtained.

[0025] This invention also provides an application of a high-opacity PP conductive and translucent primer coating. The high-opacity PP conductive and translucent primer coating or the high-opacity PP conductive and translucent primer coating prepared above is applied to a light-emitting bumper of a new energy vehicle to obtain a light-emitting bumper coating product. The specific application process includes:

[0026] S100. Pre-treatment of PP substrate bumpers for new energy vehicles to remove impurities from the substrate surface, wherein the pre-treatment includes water washing, alkaline water treatment, water washing after alkaline water treatment, drying and flame treatment.

[0027] S200. Spray a high-coverage PP conductive and light-transmitting primer onto the pretreated PP substrate bumper of a new energy vehicle. The thickness of the primer layer is 15-20μm, and it is surface dry in 10-15 minutes after spraying.

[0028] S300, mix the paint that matches the body of the new energy vehicle and spray it onto the primer layer. Then bake the paint layer for 40-60 minutes and remove it and cool it to room temperature. The paint layer film thickness is 15-35μm and the baking temperature is 60-90℃.

[0029] S400, Laser engraving is performed on the paint layer and the laser engraved micro-hole pattern is transferred to the material to form a light-transmitting part. After the laser engraving is completed, post-processing is performed to remove surface impurities. The post-processing includes water washing, alkaline water treatment, water washing after alkaline water treatment, drying, and flame treatment.

[0030] S500: After post-treatment, a clear topcoat is sprayed onto the colored paint layer to complete the application of high-coverage PP conductive and transparent primer coating on the PP substrate bumper of new energy vehicles, resulting in a finished luminous bumper coating.

[0031] Compared with existing technologies, the high-coverage PP conductive and transparent primer coating, its preparation method, and its application proposed in this invention address the challenge of forming a film on the surface of PP substrate, which is a non-polar molecule with high crystallinity, low surface energy, and poor wettability. This primer coating utilizes acrylic-modified polyolefin resin and acrylic resin containing hydrophilic polar groups (hydroxyl, carboxyl, and carbonyl). After spraying this primer coating onto the PP substrate surface, the hydrophilic polar groups migrate to the PP substrate surface, causing changes in the polarity, contact angle, and surface energy of the PP substrate surface, thus effectively reducing the film thickness of PP substrates. The surface energy of the substrate increases the adhesion between the primer and the PP substrate. Furthermore, because the acrylic-modified polyolefin resin contains chlorinated polyolefins, it introduces polar "chlorine" groups into the polyolefin. These polar groups are miscible with the coating resin and compatible with the PP plastic substrate, thus wetting the surface of the PP plastic substrate and improving the adhesion between the primer and the PP substrate. Simultaneously, the acrylic-modified polyolefin resin can introduce special functional groups such as hydroxyl, carboxyl, or carbonyl groups into the formed coating. Based on the structure of these special functional groups, dipentene seeds can be pre-synthesized. By introducing a certain proportion of methyl methacrylate, butyl acrylate, and styrene, the "branching" of the PP substrate structure is increased, allowing it to adhere to the polyolefin surface. Therefore, the acrylic-modified polyolefin resin is similarly miscible with the PP substrate, promoting the compatibility of the primer coating with the PP substrate. Simultaneously, the modified chlorinated polyolefin is used as an adhesion promoter. The modified chlorinated polyolefin main chain interlocks with the PP substrate due to van der Waals forces, increasing the contact area between the primer coating and the PP substrate, further enhancing the adhesion between them. The modified chlorinated polyolefin can also... The strong interaction between acrylic resins gives it excellent flexibility. Titanium dioxide possesses optimal whiteness and excellent hiding power, while conductive carbon black, a high-pigment carbon black, also exhibits high hiding power and good light refraction. By incorporating titanium dioxide and conductive carbon black, this primer coating can provide high hiding power and dry film resistance even with a relatively low film thickness. The acrylic resin in this primer coating can encapsulate the conductive carbon black, titanium dioxide, and other fillers, improving resin compatibility and allowing for uniform distribution of pigments and fillers, thus resulting in excellent laser engraving performance. Therefore, this high-hiding-power conductive and translucent PP primer coating can be applied to PP substrate bumpers in new energy vehicles and meets the output requirements of different light source signals. Attached Figure Description

[0032] Figure 1 This is a flowchart illustrating the preparation method of the high-coverage PP conductive and translucent primer coating of this invention.

[0033] Figure 2 This is a flowchart illustrating the application of the high-coverage PP conductive and translucent primer coating in this invention. Detailed Implementation

[0034] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0035] The present invention provides a high-coverage PP conductive and translucent primer coating, which comprises the following components by weight percentage:

[0036] Acrylic-modified polyolefin resin 20-40%

[0037] 10-20% acrylic resin

[0038] Adhesion promoter 2-6%

[0039] Titanium dioxide 15-30%

[0040] Conductive carbon black 1-4%

[0041] Wetting and dispersing agent 1-4%

[0042] Anti-settling agent 0.2-0.8%

[0043] Leveling agent 0.2-0.6%

[0044] Solvent 20-40%,

[0045] The acrylic resin is one of 2-phenoxyethyl acrylate, ethoxyethoxy acrylate and ethoxybisphenol A dimethacrylate, the adhesion promoter is a modified chlorinated polyolefin and a polysiloxane-free polymer compound, and the solvent is a mixture of toluene, xylene, propylene glycol methyl ether acetate, ethyl ethoxypropionate and butyl acetate.

[0046] In this embodiment, the acrylic-modified polyolefin resin is XCS1516 TS-45, Nippon Paper 350S, Mitsui Chemicals UNISTOLE A-1000, and Outa CP833 are among the following: the acrylic resin is one of 2-phenoxyethyl acrylate, ethoxyethoxy acrylate, and ethoxybisphenol A dimethacrylate. The acrylic-modified polyolefin resin is mainly used to increase the adhesion between the primer and the PP substrate, and the acrylic resin is mainly used to provide flexibility to enhance the interlayer adhesion between the primer and the topcoat. The modified chlorinated polyolefin is at least one of F-2P, 526P, CP343-3, and CP730-1. The polysiloxane-free polymer compound is APC. The conductive carbon black is... The titanium dioxide is at least one of XE2B and XC72, the titanium dioxide is at least one of R996, R818, R706, R902 and FT-3000, the wetting and dispersing agent is at least one of EFKA-4310, BYK163, BYK161, EFKA-4010 and BYK-104S, the anti-settling agent is at least one of R972, H2000, R974 and A200, and the leveling agent is at least one of BYK306, BYK358N, EFKA-FL3777 and AFCONA-3700.

[0047] In this embodiment, since the PP substrate is a non-polar molecule with high crystallinity, low surface energy, and poor wettability, it is difficult to form a film on its surface. The primer coating uses an acrylic-modified polyolefin resin and an acrylic resin containing hydrophilic polar groups (hydroxyl, carboxyl, and carbonyl). After the primer coating is sprayed onto the PP substrate surface, the hydrophilic polar groups migrate to the PP substrate surface, causing changes in the polarity, contact angle, and surface energy of the PP substrate surface. This effectively reduces the surface energy of the PP substrate and increases the adhesion between the primer coating and the PP substrate. Furthermore, since the acrylic-modified polyolefin resin is similarly miscible with the PP substrate, it further promotes the compatibility between the primer coating and the PP substrate. Simultaneously, a modified chlorinated polyolefin is selected as an adhesion promoter. The modified chlorinated polyolefin mainly... The chains interlock with the PP substrate due to van der Waals forces, increasing the contact area between the primer and the PP substrate and further enhancing the adhesion between them. The modified chlorinated polyolefin also exhibits strong interaction with the acrylic resin, giving it good flexibility. Since titanium dioxide has optimal whiteness and excellent hiding power, and conductive carbon black is a high-pigment carbon black with high hiding power, and titanium dioxide also has good light refraction, the addition of titanium dioxide and conductive carbon black allows the primer to provide high hiding power and dry film resistance even with a relatively low film thickness. The acrylic resin in the primer can encapsulate the conductive carbon black, titanium dioxide, and other fillers, helping to improve resin compatibility and allowing the pigments and fillers in the primer to spread evenly, thus exhibiting good laser engraving performance.

[0048] like Figure 1 As shown, the present invention also provides a method for preparing a high-opacity PP conductive and translucent primer coating. The method for preparing the aforementioned high-opacity PP conductive and translucent primer coating includes at least the following steps:

[0049] S1. Acrylic-modified polyolefin resin, acrylic resin, xylene, and wetting and dispersing agent are added to a dispersion container and dispersed evenly to obtain mixture A. The dispersion speed is 500-600 rpm. In this step, xylene is added to reduce the resin viscosity, providing favorable conditions for the subsequent dispersion of materials. Viscosities that are too high or too low are not suitable for sand milling dispersion. At the same time, the wetting and dispersing agent is added to disperse the pigments and fillers added later, ensuring that the added pigments, fillers, and additives are effectively dispersed.

[0050] S2. Add conductive carbon black, titanium dioxide and anti-settling agent to the mixture A in sequence, and stir and disperse during the addition process. After uniform dispersion, grind the mixture to a fineness of less than 10μm using a sand mill to obtain mixture B, wherein the dispersion speed is 800-1200 rpm.

[0051] S3. Under a rotation speed of 300-500 rpm, add the adhesion promoter, toluene, and leveling agent sequentially to the mixture B and disperse them. After the addition is complete, increase the dispersion speed to 800-1000 rpm until the dispersion is uniform, thus obtaining a high-coverage PP conductive and translucent primer coating. In this step, toluene is added to adjust the viscosity of the entire primer coating system to match the actual application.

[0052] In this embodiment, the technical effects of the prepared high-coverage PP conductive and light-transmitting primer coating have been described in detail above, and will not be repeated here.

[0053] like Figure 2 As shown, this invention also provides an application of a high-opacity PP conductive and translucent primer coating. The high-opacity PP conductive and translucent primer coating or the high-opacity PP conductive and translucent primer coating prepared above is applied to a PP substrate bumper of a new energy vehicle to obtain a luminous bumper coating product. The specific application process includes:

[0054] S100. Pre-treatment of PP substrate bumpers for new energy vehicles to remove impurities from the substrate surface, wherein the pre-treatment includes water washing, alkaline water treatment, water washing after alkaline water treatment, drying and flame treatment.

[0055] In this step, since the PP substrate is a high-transparency polyolefin material, it needs to be pretreated before spraying the primer. Pretreatment of the PP substrate surface can effectively remove all impurities, including dust, debris, oil stains and grease, from the substrate surface, thus ensuring the subsequent spraying.

[0056] S200. Spray a high-coverage PP conductive and light-transmitting primer onto the pretreated PP substrate bumper of a new energy vehicle. The thickness of the primer layer is 15-20μm, and it is surface dry in 10-15 minutes after spraying.

[0057] In this step, the high-coverage PP conductive and light-transmitting primer is first mixed according to the mixing ratio, and then the mixed primer is sprayed onto the pretreated PP substrate bumper of the new energy vehicle in one go.

[0058] S300, mix the paint that matches the body of the new energy vehicle and spray it onto the primer layer. Then bake the paint layer for 40-60 minutes and remove it and cool it to room temperature. The paint layer film thickness is 15-35μm and the baking temperature is 60-90℃.

[0059] In this step, firstly, a matching paint is formulated according to the color of the new energy vehicle body. Then, the paint is sprayed onto the surface of the primer coating layer and baked. After baking, it is removed and cooled. The paint uses a special acrylic resin with a Tg of 40-70℃. If the Tg is too high, the paint film will be too brittle and prone to powdering. If the Tg is too low, the paint film will be sticky and the film-forming effect will be poor. At the same time, the acrylic resin can also increase the compatibility with pigments, fillers and laser engraving additives, so that the pigments and fillers are evenly spread, thereby providing good adhesion and laser engraving performance.

[0060] S400, Laser engraving is performed on the paint layer and the laser engraved micro-hole pattern is transferred to the material to form a light-transmitting part. After the laser engraving is completed, post-processing is performed to remove surface impurities. The post-processing includes water washing, alkaline water treatment, water washing after alkaline water treatment, drying, and flame treatment.

[0061] In this step, the post-processing of the laser-engraved paint layer is similar to the aforementioned pre-processing of the PP substrate surface, both aimed at removing surface impurities to ensure quality in subsequent processes. Based on the light-emitting requirements of the automotive PP substrate bumper, a laser engraving process is used to laser-engrave corresponding micro-perforation patterns onto the PP substrate bumper to form light-transmitting areas. Specifically, during the laser engraving of the micro-perforation patterns, the laser penetrates through the paint layer and the primer layer onto the PP substrate bumper. Non-laser-engraved areas achieve light blocking due to the high opacity of the primer layer, and the paint layer matches the vehicle body color.

[0062] S500: After post-treatment, a clear topcoat is sprayed onto the colored paint layer to complete the application of high-coverage PP conductive and transparent primer coating on the PP substrate bumper of new energy vehicles, resulting in a finished luminous bumper coating.

[0063] In this embodiment, the clear varnish is a commercially available topcoat clear varnish, which will not be described in detail here. Applying the aforementioned high-opacity PP conductive and translucent primer coating or the high-opacity PP conductive and translucent primer coating prepared above to the PP substrate bumper of a new energy vehicle, as described in the above description of the beneficial technical effects of the high-opacity PP conductive and translucent primer coating, this primer coating has super strong adhesion and flexibility to the PP substrate. At the same time, this primer coating can provide high opacity, dry film resistance value, and laser engraving capability. Therefore, spraying the aforementioned high-opacity PP conductive and translucent primer coating layer onto the PP substrate bumper of a new energy vehicle can meet the requirements for outputting different light source signals on the transparent PP substrate bumper of a new energy vehicle, solving the technical problems existing in current new energy vehicles.

[0064] To further understand the working principle and effective technical effects of the present invention, the following describes the preparation of high-coverage PP conductive and light-transmitting primer coatings and the performance tests based on four embodiments.

[0065] Example 1

[0066] The weight percentages of each component in this embodiment are as follows: 26% acrylic modified polyolefin resin, 12% acrylic resin, 2% adhesion promoter (APC), 2.5% adhesion promoter (526P), 1.5% conductive carbon black (XE2B), 19% titanium dioxide (R706), 5% titanium dioxide (FE-3000), 2.5% wetting and dispersing agent (EFKA-4310), 0.4% anti-settling agent (R972), 5% toluene, 8% xylene, 5% propylene glycol methyl ether acetate, 4.8% ethoxypropionate, 6% butyl acetate, and 0.3% leveling agent (EFKA-FL3777). The high-opacity PP conductive transparent primer coating was prepared based on the preparation method of the high-opacity PP conductive transparent primer coating.

[0067] Example 2

[0068] The weight percentages of each component in this embodiment are as follows: 28% acrylic modified polyolefin resin, 10% acrylic resin, 3% adhesion promoter (APC), 2% adhesion promoter (526P), 2% conductive carbon black (XE2B), 21% titanium dioxide (R706), 5% titanium dioxide (FE-3000), 2.3% wetting and dispersing agent (EFKA-4310), 0.3% anti-settling agent (R972), 6% toluene, 9.15% xylene, 4% propylene glycol methyl ether acetate, 3% ethyl ethoxypropionate, 4% butyl acetate, and 0.25% leveling agent (EFKA-FL3777). The high-opacity PP conductive transparent primer coating was prepared based on the preparation method of the high-opacity PP conductive transparent primer coating.

[0069] Example 3

[0070] The weight percentages of each component in this embodiment are as follows: 24% acrylic modified polyolefin resin, 13% acrylic resin, 2.5% adhesion promoter (APC), 3% adhesion promoter (526P), 2.5% conductive carbon black (XE2B), 24% titanium dioxide (R706), 4% titanium dioxide (FE-3000), 2.8% wetting and dispersing agent (EFKA-4310), 0.35% anti-settling agent (R972), 4% toluene, 10.15% xylene, 3% propylene glycol methyl ether acetate, 3.4% ethoxypropionate, 3% butyl acetate, and 0.3% leveling agent (EFKA-FL3777). The high-opacity PP conductive transparent primer coating was prepared based on the preparation method of high-opacity PP conductive transparent primer coating.

[0071] Example 4

[0072] The weight percentages of each component in this embodiment are as follows: 27% acrylic modified polyolefin resin, 11% acrylic resin, 2.7% adhesion promoter (APC), 2.3% adhesion promoter (526P), 1.8% conductive carbon black (XE2B), 24.62% titanium dioxide (R706), 3% titanium dioxide (FE-3000), 3% wetting and dispersing agent (EFKA-4310), 0.32% anti-settling agent (R972), 6.88% toluene, 5.5% xylene, 3.5% propylene glycol methyl ether acetate, 3% ethyl ethoxypropionate, 5% butyl acetate, and 0.38% leveling agent (EFKA-FL3777). The high-opacity PP conductive transparent primer coating was prepared based on the preparation method of high-opacity PP conductive transparent primer coating.

[0073] The high-coverage PP conductive and transparent primers prepared in Examples 1-4 were subjected to performance tests, and the corresponding performance test results are shown in Table 1.

[0074] Table 1: Performance Test Results of High Opacity PP Conductive Transparent Primer Coatings Prepared in Examples 1-4

[0075]

[0076]

[0077] As can be seen from Table 1, the high-opacity PP conductive and translucent primer coating appears normal in the container and is easy to apply. At the same time, its adhesion, water resistance, and moisture resistance all meet the test requirements. That is, the high-opacity PP conductive and translucent primer coating provided by the present invention has both excellent adhesion and high opacity, which can solve the technical problems of PP substrate bumpers for new energy vehicles in the prior art, that is, it can meet the needs of outputting different light source signals on transparent PP substrate bumpers for new energy vehicles.

[0078] The above provides a detailed description of a high-coverage PP conductive and translucent primer coating, its preparation method, and its application. Specific examples have been used to illustrate the principles and implementation methods of the invention. These examples are merely illustrative of the core ideas of the invention. It should be noted that those skilled in the art can make various improvements and modifications to the invention without departing from its principles, and these improvements and modifications also fall within the scope of protection of the claims.

Claims

1. A high-coverage PP conductive and translucent primer coating, characterized in that, Includes the following components by weight percentage: Acrylic-modified polyolefin resin 20-40% 10-20% acrylic resin Adhesion promoter 2-6% Titanium dioxide 15-30% Conductive carbon black 1-4% Wetting and dispersing agent 1-4% Anti-settling agent 0.2-0.8% Leveling agent 0.2-0.6% Solvent 20-40%; The acrylic resin is one of 2-phenoxyethyl acrylate and bisphenol A dimethacrylate; The adhesion promoter is a modified chlorinated polyolefin and a polysiloxane-free polymer compound. The modified chlorinated polyolefin is at least one of F-2P, 526P, CP343-3 and CP730-1, and the polysiloxane-free polymer compound is APC. The solvent is a mixture of toluene, xylene, propylene glycol methyl ether acetate, ethyl ethoxypropionate, and butyl acetate. The weight percentages of each component in the solvent in the primer coating are as follows: toluene 3-8%, xylene 5-15%, propylene glycol methyl ether acetate 3-8%, ethyl ethoxypropionate 3-6%, and butyl acetate 3-6%. The titanium dioxide is at least one of R996, R818, R706, R902, and FT-3000; The PP substrate is a transparent PP substrate.

2. The high-coverage PP conductive and translucent primer coating as described in claim 1, characterized in that, The conductive carbon black is at least one of XE2B and XC72.

3. The high-coverage PP conductive and translucent primer coating as described in claim 2, characterized in that, The wetting and dispersing agent is at least one of EFKA-4310, BYK163, BYK161, EFKA-4010, and BYK-104S.

4. The high-coverage PP conductive and translucent primer coating as described in claim 3, characterized in that, The anti-settling agent is at least one of R972, H2000, R974 and A200.

5. The high-coverage PP conductive and translucent primer coating as described in claim 4, characterized in that, The leveling agent is at least one of BYK306, BYK358N, EFKA-FL3777, and AFCONA-3700.

6. A method for preparing a high-coverage PP conductive and translucent primer coating, characterized in that, The method is used to prepare the high-coverage PP conductive and light-transmitting primer coating according to any one of claims 1-5, and includes at least the following steps: S1. Add acrylic modified polyolefin resin, acrylic resin, xylene and wetting and dispersing agent to a dispersion container and disperse evenly to obtain mixture A, wherein the dispersion speed is 500-600 rpm; S2. Add conductive carbon black, titanium dioxide and anti-settling agent to the mixture A in sequence, and stir and disperse during the addition process. After uniform dispersion, grind the mixture to a fineness of less than 10μm using a sand mill to obtain mixture B, wherein the dispersion speed is 800-1200 rpm. S3. Under the condition of a rotation speed of 300-500 rpm, add the adhesion promoter, toluene and leveling agent to the mixture B in sequence and disperse them. After the addition is completed, increase the dispersion speed to 800-1000 rpm until the dispersion is uniform, and a high hiding power PP conductive and light-transmitting primer coating is obtained.

7. The application of a high-coverage PP conductive and translucent primer coating, characterized in that, The high-opacity PP conductive and translucent primer coating according to any one of claims 1-5 or the high-opacity PP conductive and translucent primer coating prepared by the method described in claim 6 is applied to the luminous bumper of a new energy vehicle to obtain a luminous bumper coating product. The specific application process includes: S100. Pre-treatment of PP substrate bumpers for new energy vehicles to remove impurities from the substrate surface, wherein the pre-treatment includes water washing, alkaline water treatment, water washing after alkaline water treatment, drying and flame treatment. S200. Spray a high-coverage PP conductive and light-transmitting primer onto the pretreated PP substrate bumper of a new energy vehicle. The thickness of the primer layer is 15-20μm, and it is surface dry in 10-15 minutes after spraying. S300, mix the paint that matches the body of the new energy vehicle and spray it onto the primer layer. Then bake the paint layer for 40-60 minutes and remove it and cool it to room temperature. The paint layer film thickness is 15-35μm and the baking temperature is 60-90℃. S400, Laser engraving is performed on the paint layer and the laser engraved micro-hole pattern is transferred to the material to form a light-transmitting part. After the laser engraving is completed, post-processing is performed to remove surface impurities. The post-processing includes water washing, alkaline water treatment, water washing after alkaline water treatment, drying, and flame treatment. S500: After post-treatment, a clear topcoat is sprayed onto the colored paint layer to complete the application of high-coverage PP conductive and transparent primer coating on the PP substrate bumper of new energy vehicles, resulting in a finished luminous bumper coating.

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