Automobile bumper structure and machining method thereof

Abstract

An automobile bumper structure is used for being installed at the front end and the rear end of an automobile body and used in cooperation with a lamp strip on the surface of the automobile body and comprises a transparent PP bumper body, a transparent primer layer, a laser etching layer, a light-transmitting colored paint layer and a paint film protection layer are sequentially arranged on the surface of the transparent PP bumper body in a stacked mode, and laser etching patterns are arranged on the laser etching layer; the transparent primer layer is prepared from the following components in percentage by weight: 20 to 30 percent of chlorinated polyolefin resin, 1 to 2 percent of polyester phosphate adhesion promoter, 1 to 3 percent of acrylic modified resin, 25 to 30 percent of butyl acetate, 25 to 30 percent of xylene, 13 to 18 percent of cyclohexanone and 0.1 to 0.4 percent of modified polymer flatting agent. The invention further discloses a method for machining the automobile bumper structure.

Description

Technical Field

[0001] The invention relates to the technical field of automobile parts processing, in particular to an automobile bumper structure and a processing method thereof. Background Art

[0002] The car bumper is a rod-shaped object installed at the front and rear ends of the car. It not only has a decorative function, but also serves as a safety device to absorb and buffer external impact forces and protect the car body and occupants. In order to meet the lightweight requirements of the bumper, most car bumpers on the market are made of engineering plastics. At present, the industry mainly uses PP materials to make bumpers to ensure the structural strength of the bumper. In order to improve the decorative function of the car bumper, the bumper is often coated with a layer to provide a specific appearance. However, the existing car bumper coating materials are all single-color, with low recognition, and it is difficult to meet the user's decorative needs. In addition, the common coating materials on the market have insufficient adhesion on the PP substrate, and the coating on the bumper is easy to fall off after a period of use, which affects the appearance of the bumper. Summary of the invention

[0003] Based on this, it is necessary to provide a car bumper structure with strong coating adhesion and capable of displaying a preset pattern and a processing method thereof in order to address the above-mentioned deficiencies.

[0004] A car bumper structure, used to be installed at the front and rear ends of a car body and used in conjunction with a light strip on the surface of the car body, the car bumper structure comprises a transparent PP bumper body, the surface of the transparent PP bumper body is sequentially stacked with a transparent primer layer, a laser engraving layer, a light-transmitting color paint layer and a paint film protective layer, and the laser engraving layer has a laser engraving pattern; The transparent primer layer is composed of the following components in weight fractions: 20-30% chlorinated polyolefin resin, 1-2% polyester phosphate adhesion promoter, 1-3% acrylic modified resin, 25-30% butyl acetate, 25-30% xylene, 13-18% cyclohexanone, and 0.1-0.4% modified polymer leveling agent; The laser carving layer is composed of the following components in weight fractions: 20-35% of modified acrylic polyol resin, 1-2% of chlorinated polyolefin, 40-60% of conductive covering black paste, 3-8% of butyl acetate, 5-15% of xylene, 3-6% of cyclohexanone, and 0-0.8% of laser carving powder; The light-transmitting paint layer is composed of the following components by weight: 40-50% saturated polyester, 2-6% butylated amino resin, 8-13% EVA wax, 1-4% CAB resin, 0.5-2% polyamide wax, 15-20% butyl acetate, 5-10% 3-ethoxyethyl propionate, 0-10% pearl powder, and 5-15% color paste; The paint film protective layer is composed of the following components in weight fractions: 50-65% of hydroxyl acrylic resin, 10-15% of anti-sagging resin, 0-6% of hydroxyl-containing hyperbranched polyester, 2-4% of ethylene glycol butyl ether acetate, 1-4% of diethylene glycol butyl ether acetate, 2-4% of ethyl 3-ethoxypropionate, 5-8% of propylene glycol methyl ether acetate, 8-12% of butyl acetate, 0.8-1% of light stabilizer, 0.6-0.8% of ultraviolet light absorber, 0.1-0.3% of conductive agent, 0.001% of drying agent, 0.08-0.3% of polyether modified polydimethylsiloxane, and 0.3-1% of polyacrylate leveling agent.

[0005] In one embodiment, the laser carving layer is composed of the following components in weight fractions: 20-30% modified acrylic polyol resin, 1-2% chlorinated polyolefin, 50-60% conductive covering black paste, 3-8% butyl acetate, 5-10% xylene, 3-6% cyclohexanone, and 0.3-0.8% laser carving powder; or The laser carving layer is composed of the following components in weight fractions: 25-35% of modified acrylic polyol resin, 1-2% of chlorinated polyolefin, 40-50% of conductive covering black paste, 3-8% of butyl acetate, 10-15% of xylene, and 3-6% of cyclohexanone.

[0006] In one embodiment, the light-transmitting paint layer is composed of the following components in weight fractions: saturated polyester 40-50%, butylated amino resin 2-6%, EVA wax 8-13%, CAB resin 1-4%, polyamide wax 0.5-2%, butyl acetate 15-20%, 3-ethoxyethyl propionate 5-10%, weather-resistant pearl powder 0-5%, metallic effect pearl powder 0-5%, nano color paste 5-15%; or The light-transmitting paint layer is composed of the following components in weight fractions: 40-50% saturated polyester, 2-6% butylated amino resin, 8-13% EVA wax, 1-4% CAB resin, 0.5-2% polyamide wax, 15-20% butyl acetate, 5-10% ethyl 3-ethoxypropionate, 0-5% weather-resistant pearl powder, 0-5% silver powder, and 5-15% weather-resistant color paste.

[0007] In one embodiment, the paint film protective layer is composed of the following components in weight fractions: 50-60% hydroxyl acrylic resin, 10-15% anti-sagging resin, 3-6% hydroxyl-containing hyperbranched polyester, 2-4% ethylene glycol butyl ether acetate, 2-4% diethylene glycol butyl ether acetate, 2-4% 3-ethoxyethyl propionate, 5-8% propylene glycol methyl ether acetate, 8-12% butyl acetate, 0.8-1% light stabilizer, 0.6-0.8% ultraviolet light absorber, 0.1-0.3% conductive agent, 0.001% drying agent, 0.1-0.3% polyether modified polydimethylsiloxane, and 0.5-1% polyacrylate leveling agent; or The paint film protective layer is composed of the following components in weight fractions: 55-65% of hydroxy acrylic resin, 10-15% of anti-sagging resin, 2-4% of ethylene glycol butyl ether acetate, 1-3% of diethylene glycol butyl ether acetate, 2-4% of ethyl 3-ethoxypropionate, 5-8% of propylene glycol methyl ether acetate, 8-12% of butyl acetate, 0.8-1% of light stabilizer, 0.6-0.8% of ultraviolet light absorber, 0.1-0.3% of conductive agent, 0.001% of drying agent, 0.08-0.2% of polyether modified polydimethylsiloxane, and 0.3-0.8% of polyacrylate leveling agent.

[0008] In one embodiment, another transparent primer layer is provided between the laser engraving layer and the light-transmitting color paint layer.

[0009] The present invention also discloses a method for processing the above-mentioned automobile bumper structure, comprising the following steps: S1. Prepare a transparent PP rod made of PP material; S2. Spray a layer of transparent primer on the surface of the transparent PP rod to form a transparent primer layer, wherein the transparent primer is composed of the following components in weight fractions: 20-30% of chlorinated polyolefin resin, 1-2% of polyester phosphate adhesion promoter, 1-3% of acrylic modified resin, 25-30% of butyl acetate, 25-30% of xylene, 13-18% of cyclohexanone, and 0.1-0.4% of modified polymer leveling agent; S3. Spray a layer of laser engraving primer on the surface of the transparent primer layer to form a laser engraving layer, wherein the laser engraving primer is composed of the following components in weight fractions: 20-35% of modified acrylic polyol resin, 1-2% of chlorinated polyolefin, 40-60% of conductive covering black paste, 3-8% of butyl acetate, 5-15% of xylene, 3-6% of cyclohexanone, and 0-0.8% of laser engraving powder; S4, performing laser engraving on the surface of the laser engraving layer to form a laser engraving pattern; S5. Spraying a translucent paint on the laser engraving layer to form a translucent paint layer, wherein the translucent paint is composed of the following components by weight: 40-50% saturated polyester, 2-6% butylated amino resin, 8-13% EVA wax, 1-4% CAB resin, 0.5-2% polyamide wax, 15-20% butyl acetate, 5-10% ethyl 3-ethoxypropionate, 0-10% pearl powder, and 5-15% color paste; S6. Spray a high-leveling varnish on the light-transmitting color paint layer to form a paint film protective layer, wherein the high-leveling varnish is composed of the following components in weight fractions: 50-65% of hydroxyl acrylic resin, 10-15% of anti-sagging resin, 0-6% of hydroxyl-containing hyperbranched polyester, 2-4% of ethylene glycol butyl ether acetate, 1-4% of diethylene glycol butyl ether acetate, 2-4% of ethyl 3-ethoxypropionate, 5-8% of propylene glycol methyl ether acetate, 8-12% of butyl acetate, 0.8-1% of light stabilizer, 0.6-0.8% of ultraviolet light absorber, 0.1-0.3% of conductive agent, 0.001% of drying agent, 0.08-0.3% of polyether modified polydimethylsiloxane, and 0.3-1% of polyacrylate leveling agent.

[0010] In one embodiment, the laser carving primer is composed of the following components in weight fractions: 20-35% modified acrylic polyol resin, 1-2% chlorinated polyolefin, 40-60% conductive covering black paste, 3-8% butyl acetate, 5-15% xylene, 3-6% cyclohexanone, and 0.5% laser carving powder.

[0011] In one embodiment, after laser engraving is performed on the surface of the laser engraving layer to form a laser engraving pattern, a transparent primer is sprayed on the surface of the laser engraving layer to form a laser engraving protective layer, and the translucent color paint is sprayed on the laser engraving protective layer.

[0012] The automobile bumper structure and processing method thereof of the present invention are implemented by arranging a transparent primer layer on the surface of a transparent PP bumper body, wherein an acrylic modified resin and a chlorinated polyolefin resin are added to the transparent primer layer, and a polyester phosphate adhesion promoter and a modified polymer leveling agent are used at the same time, thereby improving the adhesion and water resistance of the transparent primer layer on the surface of the PP material, and preventing the coating from falling off the surface of the transparent PP bumper body; and arranging a laser engraving pattern on the laser engraving layer, so that when the light strip is turned on, the light passes through the transparent PP bumper body and the laser engraving pattern, and a preset pattern can be displayed to give the bumper a specific appearance, thereby meeting the user's demand for the bumper appearance, and being conducive to improving the market competitiveness of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 A schematic cross-sectional view of a vehicle bumper structure in one embodiment of the present invention; Figure 2 The present invention is a flowchart of a method for processing a vehicle bumper structure in one embodiment of the present invention. DETAILED DESCRIPTION

[0014] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0015] See also Figure 1 The present invention discloses a car bumper structure with strong coating adhesion and capable of displaying a preset pattern, and the car bumper structure is used to be installed at the front and rear ends of the car body and used in conjunction with a light strip on the surface of the car body. In this embodiment, the transparent PP bar body 100 is made of PP material. The PP (Polypropylene) material is a semi-crystalline thermoplastic plastic with high impact resistance, strong mechanical properties, and resistance to corrosion by a variety of organic solvents and acids and alkalis. While ensuring the mechanical strength of the car bumper structure, it is beneficial to extend the service life of the car bumper structure. In addition, by making the main body of the car bumper structure of PP material, the main body of the car bumper structure can have a certain degree of light transmittance. In this way, when the light strip is turned on, the light emitted by the light strip will be emitted through the transparent PP bar body 100, so that the transparent PP bar body 100 has a luminous effect. In addition, according to the size of the transparent PP bar body 100 and the limitations of the processing technology, the transparent PP bar body 100 can be transparent or translucent to ensure that the light emitted by the light strip can pass through the transparent PP bar body 100.

[0016] In this embodiment, the surface of the transparent PP bar body 100 is stacked with a transparent primer layer 200, a laser engraving layer 300, a light-transmitting color paint layer 400 and a paint film protective layer 500 in sequence, and a laser engraving pattern is provided on the laser engraving layer 300. In this way, when the light emitted by the light strip passes through the transparent PP bar body 100 and sequentially penetrates the transparent primer layer 200, the laser engraving layer 300, the light-transmitting color paint layer 400 and the paint film protective layer 500, a pattern with the same shape as the laser engraving pattern will be formed on the side of the paint film protective layer 500 facing away from the transparent PP bar body 100, so as to meet the user's requirements for the appearance of the automobile bumper structure. Further, the transparent primer layer 200 is composed of the following components in weight fractions: the transparent primer layer 200 is composed of the following components in weight fractions: 20-30% chlorinated polyolefin resin, 1-2% polyester phosphate adhesion promoter, 1-3% acrylic modified resin, 25-30% butyl acetate, 25-30% xylene, 13-18% cyclohexanone, and 0.1-0.4% modified polymer leveling agent; the laser carving layer 300 is composed of the following components in weight fractions: 20-35% modified acrylic polyol resin, 1-2% chlorinated polyolefin, 40-60% conductive covering black paste, 3-8% butyl acetate, 5-15% xylene, 3-6% cyclohexanone, and 0-0.8% laser carving powder; The paint layer 400 is composed of the following components in weight fractions: 40-50% saturated polyester, 2-6% butylated amino resin, 8-13% EVA wax, 1-4% CAB resin, 0.5-2% polyamide wax, 15-20% butyl acetate, 5-10% 3-ethoxyethyl propionate, 0-10% pearlescent powder, and 5-15% color paste; the paint film protection layer 500 is used to ensure that the light passing through the laser carving layer 300 and the translucent paint layer 400 can be emitted to the environment, so that users or other personnel can observe the pattern displayed on the car bumper structure when the lights are on. On the other hand, the paint film protection layer 500 is also used to protect the translucent paint layer 400 to ensure the light transmission effect of the translucent paint layer 400. The paint film protective layer 500 is composed of the following components in weight fractions: 50-65% of hydroxyl acrylic resin, 10-15% of anti-sagging resin, 0-6% of hydroxyl-containing hyperbranched polyester, 2-4% of ethylene glycol butyl ether acetate, 1-4% of diethylene glycol butyl ether acetate, 2-4% of ethyl 3-ethoxypropionate, 5-8% of propylene glycol methyl ether acetate, 8-12% of butyl acetate, 0.8-1% of light stabilizer, 0.6-0.8% of ultraviolet light absorber, 0.1-0.3% of conductive agent, 0.001% of drying agent, 0.08-0.3% of polyether modified polydimethylsiloxane, and 0.3-1% of polyacrylate leveling agent. In addition, another transparent primer layer 200 is provided between the laser engraving layer 300 and the translucent paint layer 400. By providing another transparent primer layer 200 between the laser engraving layer 300 and the translucent paint layer 400, while ensuring the smooth emission of light, the laser engraving layer 300 can be protected and the stability of the translucent paint layer 400 adhering to the laser engraving layer 300 can be improved.

[0017] The effect of the automobile bumper structure of the present invention is described below with reference to specific examples.

[0018] Example 1 The automobile bumper structure comprises a transparent PP bumper body 100 , on the surface of which a transparent primer layer 200 , a laser engraving layer 300 , a light-transmitting color paint layer 400 and a paint film protection layer 500 are sequentially stacked, and the laser engraving layer 300 has a laser engraving pattern.

[0019] The transparent primer layer 200 is composed of the following components in weight fractions: 20-30% chlorinated polyolefin resin, 1-2% polyester phosphate adhesion promoter, 1-3% acrylic modified resin, 25-30% butyl acetate, 25-30% xylene, 13-18% cyclohexanone, and 0.1-0.4% modified polymer leveling agent.

[0020] The laser carving layer 300 is composed of the following components in weight fractions: 25-35% of modified acrylic polyol resin, 1-2% of chlorinated polyolefin, 40-50% of conductive covering black paste, 3-8% of butyl acetate, 10-15% of xylene, and 3-6% of cyclohexanone.

[0021] The light-transmitting paint layer 400 is composed of the following components in weight fractions: 40-50% saturated polyester, 2-6% butylated amino resin, 8-13% EVA wax, 1-4% CAB resin, 0.5-2% polyamide wax, 15-20% butyl acetate, 5-10% 3-ethoxyethyl propionate, 0-5% weather-resistant pearl powder, 0-5% silver powder, and 5-15% weather-resistant color paste. Among them, 40-50% saturated polyester includes 35-40% saturated polyester resin and 5-10% anti-sagging saturated polyester; 1-4% CAB resin includes 0.5~2% CAB resin 381-2 and 0.5~2% CAB resin 381-0.1; and polyamide wax is pre-activated polyamide wax.

[0022] The paint film protective layer 500 is composed of the following components in weight fractions: 55-65% hydroxy acrylic resin, 10-15% anti-sagging resin, 2-4% ethylene glycol butyl ether acetate, 1-3% diethylene glycol butyl ether acetate, 2-4% ethyl 3-ethoxypropionate, 5-8% propylene glycol methyl ether acetate, 8-12% butyl acetate, 0.8-1% light stabilizer, 0.6-0.8% ultraviolet light absorber, 0.1-0.3% conductive agent, 0.001% drying agent, 0.08-0.2% polyether modified polydimethylsiloxane, and 0.3-0.8% polyacrylate leveling agent. Among them, the model of the light stabilizer is Tinuvin 292, the model of the ultraviolet light absorber is Tinuvin 400, and the model of the conductive agent is BYK-ES80.

[0023] Example 2 The automobile bumper structure comprises a transparent PP bumper body 100 , on the surface of which a transparent primer layer 200 , a laser engraving layer 300 , a light-transmitting color paint layer 400 and a paint film protection layer 500 are sequentially stacked, and the laser engraving layer 300 has a laser engraving pattern.

[0024] The transparent primer layer 200 is composed of the following components in weight fractions: 20-30% chlorinated polyolefin resin, 1-2% polyester phosphate adhesion promoter, 1-3% acrylic modified resin, 25-30% butyl acetate, 25-30% xylene, 13-18% cyclohexanone, and 0.1-0.4% modified polymer leveling agent.

[0025] The laser carving layer 300 is composed of the following components in weight fractions: 20-30% of modified acrylic polyol resin, 1-2% of chlorinated polyolefin, 50-60% of conductive covering black paste, 3-8% of butyl acetate, 5-10% of xylene, 3-6% of cyclohexanone, and 0.3-0.8% of laser carving powder.

[0026] The light-transmitting paint layer 400 is composed of the following components in weight fractions: 40-50% saturated polyester, 2-6% butylated amino resin, 8-13% EVA wax, 1-4% CAB resin, 0.5-2% polyamide wax, 15-20% butyl acetate, 5-10% 3-ethoxyethyl propionate, 0-5% weather-resistant pearl powder, 0-5% metal effect pearl powder, and 5-15% nano-color paste. Preferably, the nano-color paste is an ultra-fine weather-resistant nano-color paste. Among them, 40-50% saturated polyester includes 35-40% saturated polyester resin and 5-10% anti-sagging saturated polyester; 1-4% CAB resin includes 0.5~2% CAB resin 381-2 and 0.5~2% CAB resin 381-0.1; polyamide wax is pre-activated polyamide wax.

[0027] The paint film protective layer 500 is composed of the following components in weight fractions: 50-60% hydroxy acrylic resin, 10-15% anti-sagging resin, 3-6% hydroxyl-containing hyperbranched polyester, 2-4% ethylene glycol butyl ether acetate, 2-4% diethylene glycol butyl ether acetate, 2-4% ethyl 3-ethoxypropionate, 5-8% propylene glycol methyl ether acetate, 8-12% butyl acetate, 0.8-1% light stabilizer, 0.6-0.8% ultraviolet light absorber, 0.1-0.3% conductive agent, 0.001% drying agent, 0.1-0.3% polyether modified polydimethylsiloxane, and 0.5-1% polyacrylate leveling agent. Among them, the model of the light stabilizer is Tinuvin 292, the model of the ultraviolet light absorber is Tinuvin 400, and the model of the conductive agent is BYK-ES80.

[0028] Comparative Example 1 The automobile bumper structure comprises a transparent PP bumper body 100 , on the surface of which a transparent primer layer 200 , a laser engraving layer 300 , a light-transmitting color paint layer 400 and a paint film protection layer 500 are sequentially stacked, and the laser engraving layer 300 has a laser engraving pattern.

[0029] The transparent primer layer 200 is composed of the following components in weight fractions: 15-20% of chlorinated polyolefin resin, 25-30% of butyl acetate, 35-40% of xylene, 13-18% of cyclohexanone, and 0.1-0.4% of modified polymer leveling agent.

[0030] The laser carving layer 300 is composed of the following components in weight fractions: 20-30% of modified acrylic polyol resin, 1-2% of chlorinated polyolefin, 50-60% of conductive covering black paste, 3-8% of butyl acetate, 5-10% of xylene, 3-6% of cyclohexanone, and 0.3-0.8% of laser carving powder.

[0031] The light-transmitting paint layer 400 is composed of the following components in weight fractions: 40-50% saturated polyester, 2-6% butylated amino resin, 8-13% EVA wax, 1-4% CAB resin, 0.5-2% polyamide wax, 15-20% butyl acetate, 5-10% 3-ethoxyethyl propionate, 0-5% weather-resistant pearl powder, 0-5% metal effect pearl powder, and 5-15% nano-color paste. Preferably, the nano-color paste is an ultra-fine weather-resistant nano-color paste. Among them, 40-50% saturated polyester includes 35-40% saturated polyester resin and 5-10% anti-sagging saturated polyester; 1-4% CAB resin includes 0.5~2% CAB resin 381-2 and 0.5~2% CAB resin 381-0.1; polyamide wax is pre-activated polyamide wax.

[0032] The paint film protective layer 500 is composed of the following components in weight fractions: 50-60% hydroxy acrylic resin, 10-15% anti-sagging resin, 3-6% hydroxyl-containing hyperbranched polyester, 2-4% ethylene glycol butyl ether acetate, 2-4% diethylene glycol butyl ether acetate, 2-4% ethyl 3-ethoxypropionate, 5-8% propylene glycol methyl ether acetate, 8-12% butyl acetate, 0.8-1% light stabilizer, 0.6-0.8% ultraviolet light absorber, 0.1-0.3% conductive agent, 0.001% drying agent, 0.1-0.3% polyether modified polydimethylsiloxane, and 0.5-1% polyacrylate leveling agent. Among them, the model of the light stabilizer is Tinuvin 292, the model of the ultraviolet light absorber is Tinuvin 400, and the model of the conductive agent is BYK-ES80.

[0033] Comparative Example 2 The automobile bumper structure comprises a transparent PP bumper body 100 , on the surface of which a transparent primer layer 200 , a laser engraving layer 300 , a light-transmitting color paint layer 400 and a paint film protection layer 500 are sequentially stacked, and the laser engraving layer 300 has a laser engraving pattern.

[0034] The transparent primer layer 200 is composed of the following components in weight fractions: 20-30% of chlorinated polyolefin resin, 25-30% of butyl acetate, 25-35% of xylene, 13-18% of cyclohexanone, and 0.1-0.4% of modified polymer leveling agent.

[0035] The laser carving layer 300 is composed of the following components in weight fractions: 20-30% of modified acrylic polyol resin, 1-2% of chlorinated polyolefin, 50-60% of conductive covering black paste, 3-8% of butyl acetate, 5-10% of xylene, 3-6% of cyclohexanone, and 0.3-0.8% of laser carving powder.

[0036] The light-transmitting paint layer 400 is composed of the following components in weight fractions: 40-50% saturated polyester, 2-6% butylated amino resin, 8-13% EVA wax, 1-4% CAB resin, 0.5-2% polyamide wax, 15-20% butyl acetate, 5-10% 3-ethoxyethyl propionate, 0-5% weather-resistant pearl powder, 0-5% metal effect pearl powder, and 5-15% nano-color paste. Preferably, the nano-color paste is an ultra-fine weather-resistant nano-color paste. Among them, 40-50% saturated polyester includes 35-40% saturated polyester resin and 5-10% anti-sagging saturated polyester; 1-4% CAB resin includes 0.5~2% CAB resin 381-2 and 0.5~2% CAB resin 381-0.1; polyamide wax is pre-activated polyamide wax.

[0037] The paint film protective layer 500 is composed of the following components in weight fractions: 50-60% hydroxy acrylic resin, 10-15% anti-sagging resin, 3-6% hydroxyl-containing hyperbranched polyester, 2-4% ethylene glycol butyl ether acetate, 2-4% diethylene glycol butyl ether acetate, 2-4% ethyl 3-ethoxypropionate, 5-8% propylene glycol methyl ether acetate, 8-12% butyl acetate, 0.8-1% light stabilizer, 0.6-0.8% ultraviolet light absorber, 0.1-0.3% conductive agent, 0.001% drying agent, 0.1-0.3% polyether modified polydimethylsiloxane, and 0.5-1% polyacrylate leveling agent. Among them, the model of the light stabilizer is Tinuvin 292, the model of the ultraviolet light absorber is Tinuvin 400, and the model of the conductive agent is BYK-ES80.

[0038] It was found through experiments that in Example 1, the adhesion of the transparent primer layer 200 is level 0; the covering film thickness of the laser engraving operation is 15 μm, that is, the thickness before the laser engraving pattern is set on the laser engraving layer 300 is 15 μm. In this case, the laser engraving removal rate is 90-95%; the transmittance of the translucent color paint layer 400 is less than or equal to 7.5, the light transmission state is uneven, and the translucent color paint layer 400 will produce a cloudy shadow when it is transparent, and there is a granular feeling in the translucent color paint layer 400, which will affect the light emitted through the laser engraving layer 300, and further affect the pattern effect displayed when the car bumper structure is illuminated; the orange peel grade R of the paint film protective layer 500 is 6.5-7.

[0039] In Example 2, the adhesion of the transparent primer layer 200 is level 0; the covering film thickness of the laser engraving operation is 10 μm, that is, the thickness before the laser engraving pattern is set on the laser engraving layer 300 is 10 μm. In this case, the laser engraving removal rate is greater than 98%; the transmittance of the translucent color paint layer 400 is greater than or equal to 7.5, and its light transmission state is uniform without cloudiness; the orange peel grade R of the paint film protective layer 500 is 7~8.

[0040] In Comparative Example 1, the adhesion of the transparent primer layer 200 is level 1-2; the covering film thickness of the laser engraving operation is 10μm, that is, the thickness before the laser engraving pattern is set on the laser engraving layer 300 is 10μm. In this case, the laser engraving removal rate is greater than 98%; the transmittance of the translucent color paint layer 400 is greater than or equal to 7.5, and its light transmission state is uniform without cloudiness; the orange peel grade R of the paint film protective layer 500 is 7~8.

[0041] In Comparative Example 2, the adhesion of the transparent primer layer 200 is level 0-1; the covering film thickness of the laser engraving operation is 10μm, that is, the thickness before the laser engraving pattern is set on the laser engraving layer 300 is 10μm. In this case, the laser engraving removal rate is greater than 98%; the transmittance of the translucent color paint layer 400 is greater than or equal to 7.5, and its light transmission state is uniform without cloudiness; the orange peel grade R of the paint film protective layer 500 is 7~8.

[0042] It can be seen that compared with the composition of Comparative Examples 1 and 2, when the transparent primer layer 200 of Example 1 and Example 2 is used, polyester phosphate adhesion promoter and acrylic modified resin are added, which improves the adhesion performance of the coating, and the transparent primer layer 200 has stronger adhesion on the transparent PP bumper body 100 of PP material, which can prevent the coating on the surface of the automobile bumper structure from falling off to maintain the product appearance. In Example 2, by adding laser engraving powder, the effect of laser engraving patterns on the laser engraving layer 300 can be improved, and the burrs on the parts of the laser engraving layer 300 after laser engraving can be avoided, and the laser engraving removal rate of the laser engraving operation can be improved. Furthermore, compared with Example 1, Example 2 uses metal effect pearl powder instead of silver powder, and replaces ordinary weather-resistant color paste with nano color paste, which can improve the light transmittance and light transmission effect of the light-transmitting paint layer 400. After adopting the above-mentioned composition of the light-transmitting paint layer 400, the light transmittance of the light-transmitting paint layer 400 is greater than or equal to 7.5, and its light transmission state is uniform and non-cloudy. In this way, the light-transmitting paint layer 400 can have high hiding power when there is no light, and high transmittance when exposed to light. In this way, when the light strip is turned off during the day, the color of the surface coating of the automobile bumper structure is visually consistent; when the light strip is turned on at night, the light passes through the light-transmitting paint in the laser-engraved pattern area and shows different laser-engraved patterns, thereby improving the appearance of the automobile bumper structure. In addition, the use of metallic effect pearlescent powder and nano-color paste can solve the defect of cloudiness when light is transmitted due to the color paste clumping in the light-transmitting paint layer 400. In addition, compared with Example 1, Example 2 adds a hydroxyl-containing hyperbranched polyester and adjusts the proportion of the polyacrylate leveling agent, which can improve the leveling performance of the raw materials of the paint film protective layer 500 on the surface of the translucent color paint layer 400, thereby improving the orange peel grade of the paint film protective layer 500, thereby making the automobile bumper structure have a high-leveling, high-fullness, and high-hardness appearance coating.

[0043] Please combine Figure 1 and Figure 2 The present invention also discloses a method for processing the above-mentioned automobile bumper structure, which comprises the following steps: S1. Prepare a transparent PP rod body 100 made of PP material.

[0044] S2. Spray a layer of transparent primer on the surface of the transparent PP rod body 100 to form a transparent primer layer 200. The transparent primer is composed of the following components in weight fraction: 20-30% chlorinated polyolefin resin, 1-2% polyester phosphate adhesion promoter, 1-3% acrylic modified resin, 25-30% butyl acetate, 25-30% xylene, 13-18% cyclohexanone, and 0.1-0.4% modified polymer leveling agent.

[0045] S3. Spray a layer of laser engraving primer on the surface of the transparent primer layer 200 to form a laser engraving layer 300. The laser engraving primer is composed of the following components by weight: 20-35% modified acrylic polyol resin, 1-2% chlorinated polyolefin, 40-60% conductive covering black paste, 3-8% butyl acetate, 5-15% xylene, 3-6% cyclohexanone, and 0-0.8% laser engraving powder. Preferably, the laser engraving primer is composed of the following components by weight: 20-30% modified acrylic polyol resin, 1-2% chlorinated polyolefin, 50-60% conductive covering black paste, 3-8% butyl acetate, 5-10% xylene, 3-6% cyclohexanone, and 0.3-0.8% laser engraving powder. Further preferably, in the embodiment, the laser engraving primer is composed of the following components in weight fractions: 20-35% modified acrylic polyol resin, 1-2% chlorinated polyolefin, 40-60% conductive covering black paste, 3-8% butyl acetate, 5-15% xylene, 3-6% cyclohexanone, and 0.5% laser engraving powder. By adding laser engraving powder to the laser engraving layer 300, the effect of laser engraving patterns on the laser engraving layer 300 can be improved, burrs can be avoided on the parts of the laser engraving layer 300 after laser engraving, and the laser engraving removal rate of the laser engraving operation can be improved.

[0046] S4, performing laser engraving on the surface of the laser engraving layer 300 to form a laser engraving pattern.

[0047] S5. Spraying translucent paint on the laser carving layer 300 to form a translucent paint layer 400. The translucent paint is composed of the following components in weight fractions: 40-50% saturated polyester, 2-6% butylated amino resin, 8-13% EVA wax, 1-4% CAB resin, 0.5-2% polyamide wax, 15-20% butyl acetate, 5-10% 3-ethoxyethyl propionate, 0-10% pearl powder, and 5-15% color paste. It should be noted that after spraying the translucent paint on the surface of the laser carving layer 300, the contour of the side of the translucent paint layer 400 formed that contacts the laser carving layer 300 is adapted to the contour of the surface of the laser carving layer 300, so as to fill the concave and convex parts on the laser carving pattern, which is conducive to the refraction of light when it is transmitted at the interface where the laser carving pattern part contacts the translucent paint, so as to display the pattern. Further preferably, the light-transmitting paint is composed of the following components in weight fractions: 40-50% saturated polyester, 2-6% butylated amino resin, 8-13% EVA wax, 1-4% CAB resin, 0.5-2% polyamide wax, 15-20% butyl acetate, 5-10% 3-ethoxyethyl propionate, 0-5% weather-resistant pearlescent powder, 0-5% metal effect pearlescent powder, and 5-15% nano-color paste. The use of weather-resistant pearlescent powder and metal effect pearlescent powder, as well as nano-color paste, can improve the light transmittance and light transmittance effect of the light-transmitting paint layer 400, so that the light transmittance of the light-transmitting paint layer 400 is greater than or equal to 7.5, and its light transmittance state is uniform and non-cloudy. In this way, the light-transmitting paint layer 400 can have high hiding power when there is no light, and high transmittance when exposed to light, so as to improve the appearance of the automobile bumper structure under different light.

[0048] S6. Spray high-leveling varnish on the light-transmitting color paint layer 400 to form a paint film protective layer 500. The high-leveling varnish is composed of the following components in weight fraction: 50-65% hydroxyl acrylic resin, 10-15% anti-sagging resin, 0-6% hydroxyl-containing hyperbranched polyester, 2-4% ethylene glycol butyl ether acetate, 1-4% diethylene glycol butyl ether acetate, 2-4% ethyl 3-ethoxypropionate, 5-8% propylene glycol methyl ether acetate, 8-12% butyl acetate, 0.8-1% light stabilizer, 0.6-0.8% ultraviolet light absorber, 0.1-0.3% conductive agent, 0.001% drying agent, 0.08-0.3% polyether modified polydimethylsiloxane, and 0.3-1% polyacrylate leveling agent. Further preferably, the high leveling varnish is composed of the following components in weight fractions: 50-60% hydroxyl acrylic resin, 10-15% anti-sagging resin, 3-6% hydroxyl-containing hyperbranched polyester, 2-4% ethylene glycol butyl ether acetate, 2-4% diethylene glycol butyl ether acetate, 2-4% ethyl 3-ethoxypropionate, 5-8% propylene glycol methyl ether acetate, 8-12% butyl acetate, 0.8-1% light stabilizer, 0.6-0.8% ultraviolet light absorber, 0.1-0.3% conductive agent, 0.001% drying agent, 0.1-0.3% polyether modified polydimethylsiloxane, and 0.5-1% polyacrylate leveling agent. By adding hydroxyl-containing hyperbranched polyester to the high-leveling varnish and adjusting the proportion of the polyacrylate leveling agent, the leveling performance of the raw materials of the paint film protective layer 500 on the surface of the translucent color paint layer 400 can be improved, and the orange peel grade of the paint film protective layer 500 can be improved, thereby making the automobile bumper structure have a high-leveling, high-fullness, and high-hardness appearance coating.

[0049] In one embodiment, after laser engraving is performed on the surface of the laser engraving layer 300 to form a laser engraving pattern, a transparent primer is sprayed on the surface of the laser engraving layer 300 to form a laser engraving protective layer, and the translucent color paint is sprayed on the laser engraving protective layer. In other words, another transparent primer layer 200 is provided between the laser engraving layer 300 and the translucent color paint layer 400. By providing another transparent primer layer 200 between the laser engraving layer 300 and the translucent color paint layer 400, while ensuring the smooth emission of light, the laser engraving layer 300 can be protected and the stability of the translucent color paint layer 400 adhering to the laser engraving layer 300 can be improved.

[0050] The above-mentioned automobile bumper structure and processing method thereof are as follows: a transparent primer layer 200 is arranged on the surface of a transparent PP bumper body 100, and acrylic modified resin and chlorinated polyolefin resin are added to the transparent primer layer 200, and polyester phosphate adhesion promoter and modified polymer leveling agent are used at the same time, so as to improve the adhesion and water resistance of the transparent primer layer 200 on the surface of the PP material, and prevent the coating from falling off the surface of the transparent PP bumper body 100; a laser engraving pattern is arranged on the laser engraving layer 300, so that when the light strip is turned on, the light passes through the transparent PP bumper body and the laser engraving pattern, and a preset pattern can be displayed to give the bumper a specific appearance, thereby meeting the user's demand for the bumper appearance and helping to enhance the market competitiveness of the product.

[0051] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0052] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A car bumper structure, used to be installed at the front and rear ends of a car body and used in conjunction with a light strip on the surface of the car body, the car bumper structure comprising a transparent PP bumper body, the surface of which is sequentially stacked with a transparent primer layer, a laser engraving layer, a light-transmitting color paint layer and a paint film protective layer, and the laser engraving layer has a laser engraving pattern; The transparent primer layer is composed of the following components in weight fractions: Chlorinated polyolefin resin 20-30%, polyester phosphate adhesion promoter 1-2%, acrylic modified resin 1-3%, butyl acetate 25-30%, xylene 25-30%, cyclohexanone 13-18%, modified polymer leveling agent 0.1-0.4%; The laser carving layer is composed of the following components in weight fractions: 20-35% of modified acrylic polyol resin, 1-2% of chlorinated polyolefin, 40-60% of conductive covering black paste, 3-8% of butyl acetate, 5-15% of xylene, 3-6% of cyclohexanone, and 0-0.8% of laser carving powder; The light-transmitting paint layer is composed of the following components by weight: 40-50% saturated polyester, 2-6% butylated amino resin, 8-13% EVA wax, 1-4% CAB resin, 0.5-2% polyamide wax, 15-20% butyl acetate, 5-10% 3-ethoxyethyl propionate, 0-10% pearl powder, and 5-15% color paste; The paint film protective layer is composed of the following components in weight fractions: 50-65% of hydroxyl acrylic resin, 10-15% of anti-sagging resin, 0-6% of hydroxyl-containing hyperbranched polyester, 2-4% of ethylene glycol butyl ether acetate, 1-4% of diethylene glycol butyl ether acetate, 2-4% of ethyl 3-ethoxypropionate, 5-8% of propylene glycol methyl ether acetate, 8-12% of butyl acetate, 0.8-1% of light stabilizer, 0.6-0.8% of ultraviolet light absorber, 0.1-0.3% of conductive agent, 0.001% of drying agent, 0.08-0.3% of polyether modified polydimethylsiloxane, and 0.3-1% of polyacrylate leveling agent.

2. The automobile bumper structure according to claim 1, characterized in that: The laser carving layer is composed of the following components in weight fractions: 20-30% modified acrylic polyol resin, 1-2% chlorinated polyolefin, 50-60% conductive covering black paste, 3-8% butyl acetate, 5-10% xylene, 3-6% cyclohexanone, and 0.3-0.8% laser carving powder; or The laser carving layer is composed of the following components in weight fractions: 25-35% of modified acrylic polyol resin, 1-2% of chlorinated polyolefin, 40-50% of conductive covering black paste, 3-8% of butyl acetate, 10-15% of xylene, and 3-6% of cyclohexanone.

3. The automobile bumper structure according to claim 1, characterized in that: The light-transmitting paint layer is composed of the following components by weight: 40-50% saturated polyester, 2-6% butylated amino resin, 8-13% EVA wax, 1-4% CAB resin, 0.5-2% polyamide wax, 15-20% butyl acetate, 5-10% ethyl 3-ethoxypropionate, 0-5% weather-resistant pearl powder, 0-5% metallic effect pearl powder, and 5-15% nano color paste; or The light-transmitting paint layer is composed of the following components in weight fractions: 40-50% saturated polyester, 2-6% butylated amino resin, 8-13% EVA wax, 1-4% CAB resin, 0.5-2% polyamide wax, 15-20% butyl acetate, 5-10% ethyl 3-ethoxypropionate, 0-5% weather-resistant pearl powder, 0-5% silver powder, and 5-15% weather-resistant color paste.

4. The automobile bumper structure according to claim 1, characterized in that: The paint film protective layer is composed of the following components in weight fractions: 50-60% hydroxyl acrylic resin, 10-15% anti-sagging resin, 3-6% hydroxyl-containing hyperbranched polyester, 2-4% ethylene glycol butyl ether acetate, 2-4% diethylene glycol butyl ether acetate, 2-4% ethyl 3-ethoxypropionate, 5-8% propylene glycol methyl ether acetate, 8-12% butyl acetate, 0.8-1% light stabilizer, 0.6-0.8% ultraviolet light absorber, 0.1-0.3% conductive agent, 0.001% drying agent, 0.1-0.3% polyether modified polydimethylsiloxane, and 0.5-1% polyacrylate leveling agent; or The paint film protective layer is composed of the following components in weight fractions: 55-65% of hydroxy acrylic resin, 10-15% of anti-sagging resin, 2-4% of ethylene glycol butyl ether acetate, 1-3% of diethylene glycol butyl ether acetate, 2-4% of ethyl 3-ethoxypropionate, 5-8% of propylene glycol methyl ether acetate, 8-12% of butyl acetate, 0.8-1% of light stabilizer, 0.6-0.8% of ultraviolet light absorber, 0.1-0.3% of conductive agent, 0.001% of drying agent, 0.08-0.2% of polyether modified polydimethylsiloxane, and 0.3-0.8% of polyacrylate leveling agent.

5. The automobile bumper structure according to claim 1, characterized in that: Another transparent primer layer is arranged between the laser engraving layer and the light-transmitting color paint layer.

6. A method for processing the automobile bumper structure according to any one of claims 1 to 5, characterized in that: The following steps are involved: S1. Prepare a transparent PP rod made of PP material; S2. Spray a layer of transparent primer on the surface of the transparent PP rod to form a transparent primer layer, wherein the transparent primer is composed of the following components in weight fractions: 20-30% of chlorinated polyolefin resin, 1-2% of polyester phosphate adhesion promoter, 1-3% of acrylic modified resin, 25-30% of butyl acetate, 25-30% of xylene, 13-18% of cyclohexanone, and 0.1-0.4% of modified polymer leveling agent; S3. Spray a layer of laser engraving primer on the surface of the transparent primer layer to form a laser engraving layer, wherein the laser engraving primer is composed of the following components in weight fractions: 20-35% of modified acrylic polyol resin, 1-2% of chlorinated polyolefin, 40-60% of conductive covering black paste, 3-8% of butyl acetate, 5-15% of xylene, 3-6% of cyclohexanone, and 0-0.8% of laser engraving powder; S4, performing laser engraving on the surface of the laser engraving layer to form a laser engraving pattern; S5. Spraying a translucent paint on the laser engraving layer to form a translucent paint layer, wherein the translucent paint is composed of the following components by weight: 40-50% saturated polyester, 2-6% butylated amino resin, 8-13% EVA wax, 1-4% CAB resin, 0.5-2% polyamide wax, 15-20% butyl acetate, 5-10% ethyl 3-ethoxypropionate, 0-10% pearl powder, and 5-15% color paste; S6. Spray a high-leveling varnish on the light-transmitting color paint layer to form a paint film protective layer, wherein the high-leveling varnish is composed of the following components in weight fractions: 50-65% of hydroxyl acrylic resin, 10-15% of anti-sagging resin, 0-6% of hydroxyl-containing hyperbranched polyester, 2-4% of ethylene glycol butyl ether acetate, 1-4% of diethylene glycol butyl ether acetate, 2-4% of ethyl 3-ethoxypropionate, 5-8% of propylene glycol methyl ether acetate, 8-12% of butyl acetate, 0.8-1% of light stabilizer, 0.6-0.8% of ultraviolet light absorber, 0.1-0.3% of conductive agent, 0.001% of drying agent, 0.08-0.3% of polyether modified polydimethylsiloxane, and 0.3-1% of polyacrylate leveling agent.

7. The method according to claim 6, characterized in that The laser carving primer is composed of the following components in weight fractions: 20-35% of modified acrylic polyol resin, 1-2% of chlorinated polyolefin, 40-60% of conductive covering black paste, 3-8% of butyl acetate, 5-15% of xylene, 3-6% of cyclohexanone and 0.5% of laser carving powder.

8. The method according to claim 6, characterized in that After laser engraving is performed on the surface of the laser engraving layer to form a laser engraving pattern, a transparent primer is sprayed on the surface of the laser engraving layer to form a laser engraving protective layer, and the translucent color paint is sprayed on the laser engraving protective layer.

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