High-performance PP composite material automobile bumper and processing technology thereof

Abstract

The invention discloses a high-performance PP (polypropylene) composite material automobile bumper which comprises the following components in parts by weight: 40-80 parts of PP resin; 12 to 24 parts of glass fiber; 10 to 16 parts of carbon fiber filaments; 8 to 12 parts of titanium diboride powder; 3-6 parts of silicon-zirconium mixed powder; 6-17 parts of a flame retardant; 0.2 to 1.2 parts of an antioxidant; and 0.1-1.5 parts of a release agent. The titanium diboride powder is mixed with the silicon-zirconium mixed powder to enhance the hardness and wear resistance, the PP resin is pre-impregnated with the carbon fibers to enhance the strength of the PP resin, and finally the glass fibers are blended to enhance the heat resistance and mechanical strength, so that the preparation of the automobile bumper is further enhanced, the overall lightweight design is realized, and the thin-wall production requirement can be met.

Description

Technical Field

[0001] The invention belongs to the technical field of bumper materials, and in particular relates to a high-performance PP composite material automobile bumper and a processing technology thereof. Background Art

[0002] The automobile industry is a pillar industry of my country's national economy. Realizing automobile lightweighting has become an important measure for the country to save energy in the development of the automobile industry. Lightweighting of automobiles means reducing the weight of automobiles as much as possible while ensuring the strength, safety and other performance of automobiles, thereby improving the power of automobiles, reducing fuel consumption and reducing exhaust pollution. Statistical studies have shown that for every 10% weight reduction of passenger cars, fuel consumption can be reduced by 6%-8%, and every 1L reduction in gasoline consumption will reduce 2.5Kg of CO2 emissions.

[0003] Plasticization of automotive materials is an important means to achieve lightweighting of automobiles. In developed countries, the use of automotive plastics has exceeded 15% of the total plastic consumption, and the use of plastic composite materials in automobiles has approached 20% of the weight of the entire vehicle, effectively achieving lightweighting and reducing fuel consumption.

[0004] Plastic is a synthetic polymer material. Common types of plastics include polyvinyl chloride (PVC), polyethylene (PE), polypropylene (PP), polystyrene (PS), polyamide (PA), acrylonitrile butadiene styrene copolymer (ABS), etc. Plastics are divided into general plastics and engineering plastics according to their uses. Engineering plastics are plastics that can be used as engineering structural materials and to replace metals to manufacture machine parts, among which PA materials are particularly prominent.

[0005] The automobile bumper is an important part of the automobile exterior protective parts. At present, it is widely made of long fiber reinforced thermoplastic composite materials (PA6+GF30) composed of polyamide (PA) and glass fiber (GF), which is 40%-50% lighter than cast aluminum parts. PA6+GF30 has high mechanical and dimensional stability, good heat resistance and high impact strength, but PA6+GF30 has a large molding shrinkage rate and poor high temperature resistance. The surface of the processed parts is prone to obvious shrinkage and deformation, the scrap rate is high, and the overall weight is relatively heavy, which seriously affects the appearance quality of the parts; in addition, compared with PP materials, the cost is high and the economic benefits are reduced.

[0006] Therefore, the automobile bumper material needs to be further optimized. Summary of the invention

[0007] In view of this, the technical problem to be solved by the present invention is to provide a high-performance PP composite material automobile bumper and its processing technology, so as to avoid the problems of poor molding quality, insufficient lightness and low impact resistance of previous plastic automobile bumpers.

[0008] In order to solve the above technical problems, the present invention discloses a high-performance PP composite material automobile bumper, which comprises, by weight: PP resin 40-80 parts; Glass fiber 12-24 parts; 10-16 parts of carbon fiber filaments; 8-12 parts of titanium diboride powder; 3-6 parts of silicon-zirconium mixed powder; Flame retardant 6-17 parts; Antioxidant 0.2-1.2 parts; Release agent 0.1-1.5 parts.

[0009] According to one embodiment of the present invention, the invention comprises, by weight: PP resin 40 parts; Glass fiber 12 parts; 10 parts of carbon fiber yarn; 8 parts of titanium diboride powder; 3 parts of silicon-zirconium mixed powder; 6 parts of flame retardant; 0.2 parts of antioxidant; 0.1 part of release agent.

[0010] According to one embodiment of the present invention, the method comprises, by weight: PP resin 80 parts; Glass fiber 24 parts; 16 parts of carbon fiber yarn; 12 parts of titanium diboride powder; 6 parts of silicon-zirconium mixed powder; Flame retardant 17 parts; 1.2 parts of antioxidant; 1.5 parts of release agent.

[0011] According to one embodiment of the present invention, the method comprises, by weight: PP resin 60 parts; Glass fiber 18 parts; 13 parts of carbon fiber yarn; 10 parts of titanium diboride powder; 4.5 parts of silicon-zirconium mixed powder; Flame retardant 11.5 parts; 0.5 parts of antioxidant; 0.8 parts of release agent.

[0012] The present invention also discloses a processing technology for a high-performance PP composite material automobile bumper, comprising: Step a. Weigh the PP resin in parts by weight, pre-impregnate it in a mixed powder of carbon fiber filaments, titanium diboride powder and silicon zirconium mixed powder, and epoxy resin solution, dry it at 60-120 ° C for 1-5 hours, and then cool it naturally; Step b. Physically blending the pre-impregnated PP resin and glass fiber, flame retardant, antioxidant, and release agent in a high-speed mixer; Step c. Add water to the mixture and put it into a reactor, replace it with nitrogen 3-5 times, and heat to complete the polymerization reaction; Step d. After the polymerization is completed, the material is discharged, cooled and pelletized to obtain a PP composite material; Step e. Place the PP composite material into an extraction and drying device, extract with boiling water at 100°C for 36 hours, and dry with high-purity nitrogen at 135°C for 36 hours to obtain a high-performance PP composite material; Step f: molding the PP composite material into a car bumper through an injection molding machine and a mold.

[0013] According to one embodiment of the present invention, in step a, titanium diboride powder and silicon zirconium mixed powder are first weighed in a glove box in an argon atmosphere according to a set ratio and loaded into a high-energy ball mill steel tank, and steel balls with diameters of 10 mm, 8 mm, and 6 mm are added according to a ball-to-material ratio of 10:1, and the mass ratio of each steel ball is 6:3:1. 0.1 ml of anhydrous ethanol is added as a dispersant, the ball mill tank is sealed, and then placed on a high-energy ball mill for mixing. The ball mill speed is set to 200 r / min, the mixing time is 2 h, and after mixing, it is sieved through 80 mesh in a glove box in an argon atmosphere. The mixed composite powder is placed in a glove box and allowed to stand for 10 h, and then sintered.

[0014] According to one embodiment of the present invention, the sintering pressure is set to 40 MPa, the sintering temperature is 1000°C, the temperature is increased from room temperature to 571°C at a heating rate of 137°C / min, and then increased from 571°C to 600°C at a heating rate of 7°C / min, and kept at 600°C for 10 min, and then increased from 600°C to the target sintering temperature at a heating rate of 70°C / min and kept for 10 min, then the pressure is unloaded and the temperature is slowly cooled to room temperature to obtain a mixed powder.

[0015] Compared with the prior art, the present invention can achieve the following technical effects: The hardness and wear resistance are enhanced by mixing titanium diboride powder with silicon-zirconium mixed powder, and the strength of the PP resin is enhanced by pre-impregnating carbon fiber filaments into the PP resin. Finally, glass fiber is blended to improve heat resistance and mechanical strength, further enhancing the preparation of automobile bumpers. The overall lightweight design can meet the requirements of thin-wall production.

[0016] Of course, any product implementing the present invention does not necessarily need to achieve all of the above-mentioned technical effects at the same time. DETAILED DESCRIPTION

[0017] The following will describe the implementation methods of the present invention in detail with reference to examples, so that the implementation process of how the present invention applies technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0018] The present invention discloses a high-performance PP composite material automobile bumper, which comprises, by weight: PP resin 40-80 parts; Glass fiber 12-24 parts; 10-16 parts of carbon fiber filaments; 8-12 parts of titanium diboride powder 3-6 parts of silicon-zirconium mixed powder; Flame retardant 6-17 parts; Antioxidant 0.2-1.2 parts; Release agent 0.1-1.5 parts. Example 1

[0019] Weigh by weight 40 parts of PP resin; 12 parts of glass fiber; 10 parts of carbon fiber filaments; 8 parts of titanium diboride powder; 3 parts of silicon-zirconium mixed powder; 6 parts of flame retardant; 0.2 parts of antioxidant; and 0.1 parts of release agent.

[0020] Step a. Weigh the PP resin in parts by weight, pre-impregnate it in a mixed powder of carbon fiber filaments, titanium diboride powder and silicon zirconium mixed powder, and epoxy resin solution, dry it at 60-120 ° C for 1-5 hours, and then cool it naturally; Step b. Physically blending the pre-impregnated PP resin and glass fiber, flame retardant, antioxidant, and release agent in a high-speed mixer; Step c. Add water to the mixture and put it into a reactor, replace it with nitrogen 3-5 times, and heat to complete the polymerization reaction; Step d. After the polymerization is completed, the material is discharged, cooled and pelletized to obtain a PP composite material; Step e. Place the PP composite material into an extraction and drying device, extract with boiling water at 100°C for 36 hours, and dry with high-purity nitrogen at 135°C for 36 hours to obtain a high-performance PP composite material; Step f: molding the PP composite material into a car bumper through an injection molding machine and a mold.

[0021] In step a, titanium diboride powder and silicon zirconium mixed powder are first weighed in a glove box with an argon atmosphere according to a set ratio and loaded into a high-energy ball mill steel jar, and steel balls with diameters of 10 mm, 8 mm, and 6 mm are added according to a ball-to-material ratio of 10:1, and the mass ratio of each steel ball is 6:3:1. 0.1 ml of anhydrous ethanol is added as a dispersant, and the ball mill jar is sealed. Then, the mixture is placed on a high-energy ball mill for mixing, and the ball mill speed is set to 200 r / min. The mixing time is 2 h. After mixing, the mixture is sieved through 80 mesh in a glove box with an argon atmosphere. The mixed composite powder is placed in a glove box and allowed to stand for 10 h, and then sintered. The sintering pressure was set to 40 MPa, the sintering temperature was 1000 °C, the temperature was increased from room temperature to 571 °C at a heating rate of 137 °C / min, the temperature was increased from 571 °C to 600 °C at a heating rate of 7 °C / min, and the temperature was kept at 600 °C for 10 min. The temperature was increased from 600 °C to the target sintering temperature at a heating rate of 70 °C / min and kept for 10 min. Then the pressure was unloaded and the temperature was slowly cooled to room temperature to obtain a mixed powder. Example 2

[0022] Weigh 80 parts of PP resin, 24 parts of glass fiber, 16 parts of carbon fiber filaments, 12 parts of titanium diboride powder, 6 parts of silicon-zirconium mixed powder, 17 parts of flame retardant, 1.2 parts of antioxidant and 1.5 parts of release agent according to weight.

[0023] Step a. Weigh the PP resin in parts by weight, pre-impregnate it in a mixed powder of carbon fiber filaments, titanium diboride powder and silicon zirconium mixed powder, and epoxy resin solution, dry it at 60-120 ° C for 1-5 hours, and then cool it naturally; Step b. Physically blending the pre-impregnated PP resin and glass fiber, flame retardant, antioxidant, and release agent in a high-speed mixer; Step c. Add water to the mixture and put it into a reactor, replace it with nitrogen 3-5 times, and heat to complete the polymerization reaction; Step d. After the polymerization is completed, the material is discharged, cooled and pelletized to obtain a PP composite material; Step e. Place the PP composite material into an extraction and drying device, extract with boiling water at 100°C for 36 hours, and dry with high-purity nitrogen at 135°C for 36 hours to obtain a high-performance PP composite material; Step f: molding the PP composite material into a car bumper through an injection molding machine and a mold.

[0024] In step a, titanium diboride powder and silicon zirconium mixed powder are first weighed in a glove box with an argon atmosphere according to a set ratio and loaded into a high-energy ball mill steel jar, and steel balls with diameters of 10 mm, 8 mm, and 6 mm are added according to a ball-to-material ratio of 10:1, and the mass ratio of each steel ball is 6:3:1. 0.1 ml of anhydrous ethanol is added as a dispersant, and the ball mill jar is sealed. Then, the mixture is placed on a high-energy ball mill for mixing, and the ball mill speed is set to 200 r / min. The mixing time is 2 h. After mixing, the mixture is sieved through 80 mesh in a glove box with an argon atmosphere. The mixed composite powder is placed in a glove box and allowed to stand for 10 h, and then sintered. The sintering pressure was set to 40 MPa, the sintering temperature was 1000 °C, the temperature was increased from room temperature to 571 °C at a heating rate of 137 °C / min, the temperature was increased from 571 °C to 600 °C at a heating rate of 7 °C / min, and the temperature was kept at 600 °C for 10 min. The temperature was increased from 600 °C to the target sintering temperature at a heating rate of 70 °C / min and kept for 10 min. Then the pressure was unloaded and the temperature was slowly cooled to room temperature to obtain a mixed powder. Example 3

[0025] Weigh 60 parts of PP resin, 18 parts of glass fiber, 13 parts of carbon fiber filaments, 10 parts of titanium diboride powder, 4.5 parts of silicon-zirconium mixed powder, 11.5 parts of flame retardant, 0.5 parts of antioxidant and 0.8 parts of release agent according to weight.

[0026] Step a. Weigh PP resin according to weight proportions, pre-impregnate it in a mixed powder of carbon fiber filaments, titanium diboride powder and silicon zirconium mixed powder, and epoxy resin solution, dry it at 60-120° C. for 1-5 hours, and then cool it naturally; pre-impregnation allows the carbon fiber filaments mixed with alloy powder to adhere to the surface of the PP resin, which can improve the strength and mechanical properties of the PP resin.

[0027] Step b. Physically blending the pre-impregnated PP resin and glass fiber, flame retardant, antioxidant, and release agent in a high-speed mixer; Step c. Add water to the mixture and put it into a reactor, replace it with nitrogen 3-5 times, and heat to complete the polymerization reaction; Step d. After the polymerization is completed, the material is discharged, cooled and pelletized to obtain a PP composite material; Step e. Place the PP composite material into an extraction and drying device, extract with boiling water at 100°C for 36 hours, and dry with high-purity nitrogen at 135°C for 36 hours to obtain a high-performance PP composite material; Step f: molding the PP composite material into a car bumper through an injection molding machine and a mold.

[0028] In step a, titanium diboride powder and silicon zirconium mixed powder are first weighed in a glove box with an argon atmosphere according to a set ratio and loaded into a high-energy ball mill steel jar, and steel balls with diameters of 10 mm, 8 mm, and 6 mm are added according to a ball-to-material ratio of 10:1, and the mass ratio of each steel ball is 6:3:1. 0.1 ml of anhydrous ethanol is added as a dispersant, and the ball mill jar is sealed. Then, the mixture is placed on a high-energy ball mill for mixing, and the ball mill speed is set to 200 r / min. The mixing time is 2 h. After mixing, the mixture is sieved through 80 mesh in a glove box with an argon atmosphere. The mixed composite powder is placed in a glove box and allowed to stand for 10 h, and then sintered. The sintering pressure was set to 40 MPa, the sintering temperature was 1000 °C, the temperature was increased from room temperature to 571 °C at a heating rate of 137 °C / min, the temperature was increased from 571 °C to 600 °C at a heating rate of 7 °C / min, and the temperature was kept at 600 °C for 10 min. The temperature was increased from 600 °C to the target sintering temperature at a heating rate of 70 °C / min and kept for 10 min. Then the pressure was unloaded and the temperature was slowly cooled to room temperature to obtain a mixed powder.

[0029] After testing and comparison, the pressure strength of the automobile bumper in Example 3 is 150KPa, while that of Example 1 and Example 2 are both less than 100KPa, and the temperature resistance of Example 3 reaches 200°C, and the air tightness and corrosion resistance are qualified. The overall design can be thinner-walled and lightweight to meet production needs, while the temperature resistance of Example 1 and Example 2 cannot reach 200°C, and the lightweight design cannot meet the needs.

[0030] In summary, the present invention enhances hardness and wear resistance by mixing titanium diboride powder with silicon zirconium mixed powder, and pre-impregnates carbon fiber into PP resin to enhance the strength of PP resin, and finally blends glass fiber to improve heat resistance and mechanical strength, further enhancing the preparation of automobile bumpers, and the overall lightweight design can meet the thin-wall production requirements.

[0031] The above description shows and describes several preferred embodiments of the present invention, but as mentioned above, it should be understood that the present invention is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the invention concept described herein through the above teachings or the technology or knowledge of the relevant field. Changes and variations made by those skilled in the art do not depart from the spirit and scope of the present invention, and should be within the scope of protection of the claims attached to the present invention.

Claims

1. A high-performance PP composite material automobile bumper, characterized in that: The parts by weight include: PP resin 40-80 parts; Glass fiber 12-24 parts; 10-16 parts of carbon fiber filaments; 8-12 parts of titanium diboride powder; 3-6 parts of silicon-zirconium mixed powder; Flame retardant 6-17 parts; Antioxidant 0.2-1.2 parts; Release agent 0.1-1.5 parts.

2. The high-performance PP composite automobile bumper according to claim 1, characterized in that: The parts by weight include: PP resin 40 parts; Glass fiber 12 parts; 10 parts of carbon fiber yarn; 8 parts of titanium diboride powder 3 parts of silicon-zirconium mixed powder; 6 parts of flame retardant; 0.2 parts of antioxidant; 0.1 part of release agent.

3. The high-performance PP composite material automobile bumper according to claim 1, characterized in that: The parts by weight include: PP resin 80 parts; Glass fiber 24 parts; 16 parts of carbon fiber yarn; 12 parts of titanium diboride powder; 6 parts of silicon-zirconium mixed powder; Flame retardant 17 parts; 1.2 parts of antioxidant; 1.5 parts of release agent.

4. The high-performance PP composite automobile bumper according to claim 1, characterized in that: The parts by weight include: PP resin 60 parts; Glass fiber 18 parts; 13 parts of carbon fiber yarn; 10 parts of titanium diboride powder; 4.5 parts of silicon-zirconium mixed powder; Flame retardant 11.5 parts; 0.5 parts of antioxidant; 0.8 parts of release agent.

5. A processing technology for a high-performance PP composite material automobile bumper as claimed in claim 1, characterized in that: include: Step a. Weigh the PP resin in parts by weight, pre-impregnate it in a mixed powder of carbon fiber filaments, titanium diboride powder and silicon zirconium mixed powder, and epoxy resin solution, dry it at 60-120 ° C for 1-5 hours, and then cool it naturally; Step b. Physically blending the pre-impregnated PP resin and glass fiber, flame retardant, antioxidant, and release agent in a high-speed mixer; Step c. Add water to the mixture and put it into a reactor, replace it with nitrogen 3-5 times, and heat to complete the polymerization reaction; Step d. After the polymerization is completed, the material is discharged, cooled and pelletized to obtain a PP composite material; Step e. Place the PP composite material into an extraction and drying device, extract with boiling water at 100°C for 36 hours, and dry with high-purity nitrogen at 135°C for 36 hours to obtain a high-performance PP composite material; Step f: molding the PP composite material into a car bumper through an injection molding machine and a mold.

6. The processing technology of the high-performance PP composite material automobile bumper according to claim 5 is characterized in that: In the step a, the titanium diboride powder and the silicon zirconium mixed powder are first weighed in a glove box with an argon atmosphere according to a set ratio and loaded into a high-energy ball mill steel jar, and steel balls with diameters of 10 mm, 8 mm, and 6 mm are added according to a ball-to-material ratio of 10:1, and the mass ratio of each steel ball is 6:3:

1. 0.1 ml of anhydrous ethanol is added as a dispersant, and the ball mill jar is sealed. Then, the mixture is placed on a high-energy ball mill for mixing, and the ball mill speed is set to 200 r / min. The mixing time is 2 h. After the mixing is completed, the mixture is sieved through 80 mesh in a glove box with an argon atmosphere. The mixed composite powder is placed in a glove box and allowed to stand for 10 h, and then sintered.

7. The processing technology of the high-performance PP composite material automobile bumper according to claim 6 is characterized in that: The sintering pressure is set to 40 MPa, the sintering temperature is 1000 °C, the temperature is increased from room temperature to 571 °C at a heating rate of 137 °C / min, the temperature is increased from 571 °C to 600 °C at a heating rate of 7 °C / min, and the temperature is kept at 600 °C for 10 min. The temperature is increased from 600 °C to the target sintering temperature at a heating rate of 70 °C / min and then kept for 10 min. Then the pressure is unloaded and the temperature is slowly cooled to room temperature to obtain a mixed powder.