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Polypropylene material and its preparation method, structural part and its preparation method

A polypropylene material and a production method technology, applied in the field of vibration friction welding, can solve the problems of reduced weld strength and strength retention rate, increased material density, and increased molecular chain orientation.

Active Publication Date: 2022-04-29
江苏沃特新材料科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Polypropylene is a semi-crystalline polymer, and welding requires high amplitude, high welding pressure, and long welding time to melt the welding surface to achieve welding, but this will lead to problems such as reduced weld strength and strength retention
Specifically, when the amplitude is high, the flow rate of the molten material is faster, resulting in an increase in molecular chain orientation, resulting in a large amount of flash and a decrease in weld strength; , reduce the strength of the weld; longer welding time, it is easy to cause local overheating, leakage, resulting in a decrease in the strength of the weld, and the strength retention rate of the weld is extremely low
[0006] The existing vibration friction welding method mainly improves the welding performance by adjusting the external conditions such as the amplitude, frequency, power, welding depth, welding pressure, and adding energy-conducting ribs. The change of these conditions improves the welding efficiency. Pressure to shorten welding time to improve welding efficiency will also lead to weakening of weld strength
In addition, polypropylene is filled with talcum powder, glass fiber and other reinforcing fillers to improve weld strength and strength retention. However, this will increase the density of the material, which is not conducive to the lightweight of the final product. There is also a way to add carbon fiber to reduce the density, but the material cost will be greatly increased

Method used

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  • Polypropylene material and its preparation method, structural part and its preparation method
  • Polypropylene material and its preparation method, structural part and its preparation method
  • Polypropylene material and its preparation method, structural part and its preparation method

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preparation example Construction

[0041] Further, the present invention also provides a preparation method of the polypropylene material of any of the above-mentioned embodiments, the preparation method comprising the following steps:

[0042] Add linear homopolypropylene, ethylene-propylene random copolymer, nucleating agent and heat stabilizer into a screw extruder according to the mass ratio for melt mixing, extrude and granulate.

[0043] Mixing equipment can choose twin-screw extruder. In one of the embodiments, the temperature of each section of the twin-screw extruder is set at 190°C to 240°C. Further, in one of the embodiments, the temperature of each section of the twin-screw extruder is set at 200°C to 220°C.

[0044] Furthermore, the present invention also provides a method for manufacturing a structural member, the method adopts a plurality of parts for vibration friction welding, and the plurality of parts are made of the polypropylene material in any one of the above-mentioned embodiments.

[0...

Embodiment 1

[0053] Linear homopolypropylene with a weight average molecular weight of 2.9×105 and a molecular weight distribution width of 4.1, an ethylene-propylene random copolymer with a weight average molecular weight of 3.3×105, a molecular weight distribution width of 4.8 and an ethylene content of 3.5%, phosphate The nucleating agent and heat stabilizer are mixed according to the mass ratio of 94:5:0.2:0.8, and melted, blended and granulated on a twin-screw extruder. Then, the corresponding mechanical tensile sample and sample A for welding are injection-molded on the injection molding machine, and the sample A is welded under a certain vibration friction welding process to form a sample B, and the sample B is heat-treated at a certain temperature to obtain the final sample c. The process conditions are: extrusion temperature 210°C, injection molding temperature 210°C, vibration welding amplitude 0.6mm, welding depth 1.2mm, welding pressure 40Bar, welding holding pressure 35Bar, we...

Embodiment 2

[0055] Linear homopolypropylene with a weight average molecular weight of 2.9×105 and a molecular weight distribution width of 4.1, an ethylene-propylene random copolymer with a weight average molecular weight of 3.3×105, a molecular weight distribution width of 4.8 and an ethylene content of 3.5%, phosphate The nucleating agent and heat stabilizer are mixed according to the mass ratio of 94:5:0.2:0.8, and melted, blended and granulated on a twin-screw extruder. Then, the corresponding mechanical tensile sample and sample A for welding are injection-molded on the injection molding machine, and the sample A is welded under a certain vibration friction welding process to form a sample B, and the sample B is heat-treated at a certain temperature to obtain the final sample c. The process conditions are: extrusion temperature 210°C, injection molding temperature 210°C, vibration welding amplitude 0.6mm, welding depth 1.2mm, welding pressure 40Bar, welding holding pressure 35Bar, we...

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Abstract

The invention relates to a polypropylene material and its preparation method, a structural part and its preparation method. The polypropylene material is suitable for vibration friction welding, which is achieved by adding a specific ethylene-propylene random copolymer to linear homopolypropylene And nucleating agent, due to the introduction of random copolymers, the polypropylene material only needs a small welding amplitude to melt the polypropylene material rapidly during the vibration melting process, reducing the excess of the polypropylene molecular chain in the vibration direction. Orientation, thereby improving the mechanical properties of the polypropylene material in the direction perpendicular to the vibration, and improving the strength of the welded seam. Moreover, the polypropylene material can be melted rapidly during the vibration melting process, and the set welding depth can be quickly reached, which effectively reduces the welding time. Due to the addition of the nucleating agent, the polypropylene melt has a faster crystal nucleation rate during the cooling process after vibration melting, and more crystal nuclei are formed, thereby improving the crystallinity of the material at the welding seam and ensuring welding seam strength.

Description

technical field [0001] The invention relates to the technical field of vibration friction welding, in particular to a polypropylene material and a preparation method thereof, a structural part and a preparation method thereof. Background technique [0002] Vibration friction welding is a kind of thermal welding with high efficiency and low energy consumption. There is no need to add solvents, adhesives or other auxiliary products during welding, and the welding materials have no surface damage. The operation is simple and it is easy to realize mechanization and automation. [0003] For some polypropylene special-shaped structural parts, such as automotive interior parts, it is difficult to be molded through one-time injection molding. It can be designed into relatively simple multiple parts, and then assembled by vibration friction welding. [0004] The characteristic of polypropylene material is an important factor affecting the efficiency of vibration friction welding. Th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/12C08L23/16C08K3/32B29C65/06
CPCC08L23/12B29C65/06C08L2205/02C08L2205/24C08K2003/321C08L23/14C08K3/32
Inventor 杨兴成陈勇付金鹏帅骥葛洪柱何征吴宪
Owner 江苏沃特新材料科技有限公司
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