The incomprehensible relationship between polyolefins and automobiles
Automotive polyolefin plastic parts are divided into three categories: interior parts, exterior parts and functional parts. This article mainly introduces the application of polyolefin from the aspects of interior and exterior. It can be said that the application of polyolefin in new models has become another popular trend in the automotive industry.
Polyolefin foam material
As everyone in the plastics industry knows, foams have so far been used to a large extent for sound insulation and insulation, surface materials, seals and bumpers. Rigid foam panels range in thickness from 1 to 5 mm and are 50% to 70% lighter than conventional materials, including injection molded rigid plastics.
Swiss polyolefin foam manufacturer Sekisui Alveo has launched Alveocel LPF, a rigid foam board for the automotive industry. This plastic sheet made of closed cell PP foam has a density of 200-600 kg/m3.
According to Sekisui Alveo, this rigid foam sheet can be used to replace larger surface areas, such as hard plastic covers, and can also be used as an outer layer in a three-layer composite assembly.
The standard sizes of plastic sheets produced by Sekisui Alveo are available in two sizes: 1200x1000 mm and 1200x2200 mm, available in other sizes as needed.
Sekisui Alveo found that there is still a lot of potential for this material: tire lining to protect the car body from road scraps; it is a surface covering for automotive interiors by combining it with a suitable fabric or foil cover; One-to-one replacement for deep drawing or stamping parts.
Rigid foam plastic panels are gradually showing their outstanding characteristics in the plastics industry. AlveocelLPF rigid foam plastic sheets have a heat resistance of 140 ° C, 100% recyclable, can be manufactured by compression molding and vacuum forming, and are used as laminated covers. Substrate.
Reinforcing agent makes polyolefins no longer "hidden"
Milliken Chemical Company has introduced a high performance polyolefin reinforcement additive, Hyperform HPR-803. The product is said to reduce weight by 15% compared to conventional mineral filling systems while maintaining a good balance between stiffness and impact strength.
Milliken's new polyolefin reinforcements achieve the same surface quality as talc-filled composites, which is not possible with chopped glass. By replacing short-cut glass with Hyperform HPR-803, processors can expand the range of applications for PP and other polyolefins without being limited to current "hidden" automotive structural components for use in many visible parts such as bumpers and body panels. .
Thermoplastic polyolefin
In recent years, the application of thermoplastic polyolefins in new models has become another trend.
Currently, Nissan's 2014 Rogue models use this material in the trunk lid of the car. The new car cover has superior performance and high-end design. For this reason, it has also won the “2014 Automotive Innovation Award†from the American Society of Plastics Engineers.
It is reported that the trunk lid of the car is made of a new thermoplastic polyolefin PP resin. Painted Class A exterior door panels are manufactured by LyondellBasell with high melt flow, high stiffness, high impact properties, mineral filler filled thermoplastic polyolefin (TPO) grades (reported to be the first in North America for external lift) This material is used in the door). This cover is not only light in weight (net weight is 70% of the same volume of conventional composite materials), but also has great improvements in performance.
Among the many newly developed engineering plastics jointly developed by Borealis and Borouge, Fibremod TMW E380HP and Daplen TMEE058AI are representative. Fibremod WE380HP is a new type of PP composite material. It incorporates 20% glass reinforced fiber and 10% mineral filler based on PP. It has excellent heat resistance, good dimensional stability and more Sub-deep processing, can be widely used in automotive structural parts.
Among them, Daplen TMEE189HP not only has strong impact resistance, but also has excellent UV and scratch resistance. As an upgraded version of Daplen TMEE189HP, thermoplastic polyolefin Daplen EE058AI is produced by patentstripe-free patent technology, effectively avoiding the use of traditional polyolefins. Spotted streaks will appear shortly after, affecting the appearance of the product.
A new grade of thermoplastic polyolefin (TPO) material for automotive interior and exterior parts from the Dow Chemical Company - ENGAGE XLT polyolefin elastomers for composites manufacturers, molded product manufacturers, automotive manufacturers and Consumers bring a variety of performance advantages. Thanks to superior impact efficiency, composite manufacturers can reduce the amount of elastomer used in TPO production and ensure excellent impact resistance. The reduction in the amount of elastomer helps to increase the strength and melt flow of the TPO, while also reducing the wall thickness of the part and reducing the weight of the finished part, thereby improving the fuel economy of the car.
Computer simulations show that using ENGAGE XLT to create parts can reduce overall weight by up to 10%. Simulation tests have also demonstrated that the reduction in wall thickness of the part helps to shorten the molding cycle. The actual part forming experiments prove superior release and finished product quality.
Dave Mitchell, marketing manager for Dow Elastomers, said: "ENGAGE XLT can help users produce lighter, larger parts in less time, allowing composite manufacturers and automakers to sacrifice product quality without sacrificing product quality. Next, create safe, fuel-efficient automotive products at a more cost-effective price."
ENGAGE XLT products are available in free-flowing granular form for easy use in large-scale continuous compound operations.
High performance polyolefin
The Exxtral high performance polyolefin from ExxonMobil Chemical was selected for the rear bumper panel of the new Chevrolet Camaro. Exxtral H1725 polyolefins are used in all models of Comalo, which are already available.
Exxtral H1725 was chosen because of its good processing properties, high hardness and impact strength, and low shrinkage. The grade also has good dimensional tolerance accuracy to meet the technical requirements of components and vehicles.
Exxtral H1725 polyolefins have high impact strength at low temperatures, have a good balance of stiffness and toughness required for bumper panels, low linear coefficient of thermal expansion (CLTE) and excellent paint application properties. It is also used in automotive exterior products to impart excellent coating properties.
Exxtral H1725 polyolefin has a high melt flow rate and optimized formulation, so the processing conditions are wide, and the product has a good appearance. It does not produce "flow marks" and "tiger skin" for in-mold colored exterior products. problem.
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