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Long Glass Fiber Reinforced Polypropylene

10-27

Glass fiber reinforced modified PP

The research and application of glass fiber reinforced modified PP material, especially LGFPP material in automotive components (such as the application of typical components such as front-end module, instrument panel frame, door module, etc.) is one of the research focuses for many years.

LGFPP products refer to three-dimensional structures formed by injection molding and other processes of glass fiber modified PP composites with a length of 10-25mm. The 10~25mm long glass fiber reinforced polymer has higher strength, stiffness, toughness, good dimensional stability and low warpage than the ordinary 4-7mm short glass fiber reinforced polymer. In addition, LGFPP material has better creep resistance than short glass fiber reinforced PP (GFPP), and it will not produce obvious creep even under 100 ℃ high temperature.

Compared with metal materials and thermosetting composites, the density of LG-FPP is low, and the weight of the same parts can be reduced by 20%~50%; LGFPP can provide designers with greater design flexibility, form components with complex shapes, improve the ability to integrate auto parts, save mold costs (generally, the cost of long glass fiber reinforced polymer injection mold is about 20% of the cost of metal stamping mold), reduce energy consumption (the production energy consumption of long glass fiber reinforced polymer is only 60% - 80% of that of steel products, and 35% - 50% of that of aluminum products), and simplify assembly processes. The new product of mineral fiber reinforced PP for automobile parts has the characteristics of high strength, low coefficient of thermal expansion, high temperature resistance, good flame retardancy, low floating fiber, low warpage, low shrinkage, etc.

Foam modified PP

PP foamed material is a kind of low density material made by improving the melt strength of PP, thereby increasing the foaming ratio. It has the advantages of light weight, heat resistance and high temperature resistance.

With the development of automobile lightweight, the selection of PP foam material has become an important way to reduce the weight of automobiles. At present, its application in automobile interiors is also increasing. Among them, the use of PP foam material in various automobiles accounts for 45% of cars, 20% of trucks and engineering machinery vehicles, and 35% of passenger cars and commercial vehicles.

PP foamed materials for automobiles are mainly chemical micro foamed materials. Because the apparent quality of ordinary micro foamed PP products is very poor, it is only suitable for high-end vehicles that need surface coating, which not only increases the manufacturing cost, but also limits the promotion and application of PP foamed materials; Chemical microcellular foaming takes thermoplastic materials as the matrix and chemical foaming agent as the gas source. The self-locking process enables the gas to form a supercritical state. After the gas is injected into the mold cavity, under the effect of diffusion internal pressure, closed microcellular bubbles with a diameter of tens to tens of microns are distributed in the middle of the product, and the ideal cell diameter should be<50 μ m. However, the microcellular diameter of micro foamed PP actually produced in the domestic industry is about 80-350 μ m 。 The microcellular foaming mainly includes injection molding microcellular foaming, blow molding microcellular foaming and extrusion microcellular foaming. Injection molding microcellular foaming is applicable to various automotive interior and exterior trim parts, such as body door panel, tailgate, air duct, etc; Extruded micro foam is suitable for sealing strip, ceiling, etc; Blow molding micro foaming is applicable to automobile air duct, etc.

The use of micro foaming technology can reduce the quality of PP products by about 10%~20%. Compared with traditional materials, it can achieve a maximum weight reduction of 50% on parts, reduce the injection pressure by about 30%~50%, reduce the clamping force by about 20%, and reduce the cycle cycle by 10%~15%. At the same time, it can improve the energy saving of automobiles. Compared with traditional materials, it can achieve a maximum energy saving of 30%, improve the warping deformation of products, and make the design of products and molds more flexible.

With the vigorous development of the automobile industry, all kinds of raw materials for manufacturing automobiles have also been rapidly developed and updated. More and more automobile parts begin to use modified plastics instead of metal parts. The application of plastics in automobiles has a history of nearly 50 years. At present, the use of modified plastics for automobiles has become an important symbol to measure the level of automobile design and manufacturing. The extensive application of plastic trim has promoted the weight reduction and energy saving of automobiles and improved the aesthetic comfort of automobiles.

PP is widely used in automobiles due to its low density, high cost performance, excellent heat resistance, chemical corrosion resistance, rigidity, easy molding and recycling. Recently, there is a trend to unify automotive interior and exterior materials into PP series materials. Because the development and production cycle of high-performance basic resin is long, the investment is huge, the technical requirements are high, and the integrated advanced comprehensive technology with high precision is required, the existing PP resin needs to be modified more widely, more effectively, more economically, and more practically.

Elongation, mechanical strength and fracture resistance

Inorganic filler and elastomer toughen and strengthen PP, which is mainly "three high". It is a composite of toughened elastomers such as PP resin, ethylene propylene diene monomer (EPDM) and ethylene octene copolymer (POE), and inorganic fillers such as talcum powder and calcium carbonate. It is mainly used for injection molding of automobile bumpers, and the modified PP bumper has the advantages of low cost, light weight, easy painting, recyclable use, etc.

Sichuan Langdi new materials Co., Ltd., a wholly-owned independent subsidiary of Zhejiang Langdi Group Co., Ltd. (Stock Code: 603726), is located in Luojiang Economic Development Zone, Deyang City, Sichuan Province, specializing in the R &amp; D, preparation, sales and service of polymer composites. The company has acquired 55 mu of land, a total construction area of 32000 m2, a registered capital of 35 million yuan and a total investment of 200 million yuan. Now it has more than 30 production lines, with an annual production scale of 100000 tons and an annual output value of 1 billion yuan. The company has more than 100 employees, including more than 30 engineering and senior managers.
The company + branch attaches importance to industry university research project cooperation, has long-term technical cooperation and exchange with Sichuan University, and has a municipal material technology research center
The development and Application Engineering Center has advanced equipment and facilities for material analysis and testing at home and abroad. The company has obtained the national high-tech
It has the ability and strength of product independent innovation, independent research and development, detection, analysis and test materials, and has made a number of achievements.

 

Yijiang Zhu

weixiaoxiao6688@gmail.com

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