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LANXESS Introduces New Polyamides and Polyesters for Laser Transmission Welding - Focus on components for electrified and autonomously driving automobiles - LANXESS.com
LANXESS Introduces New Polyamides and Polyesters for Laser Transmission Welding

 

PRTODAY - Newswire & PRZOOM/ - Cologne, ‎North Rhine-Westphalia, Germany, 10/19/2018 - Focus on components for electrified and autonomously driving automobiles - LANXESS.com.

   
 
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• High transparency in the near infrared wavelength range;
• Flame-retardant, tough, and corrosion-resistant product variants;
• New hydrolysis-stabilized PBT compounds under development.

Laser transmission welding is becoming increasingly established in the series production of complex shaped plastic parts for the automotive, electrical/electronic, IT, and consumer industries. LANXESS is therefore expanding its range of laser-transparent polyamide 6 and polyamide 66 as well as PBT compounds (polybutylene terephthalate) for this forward-looking technology. “With these new products, we are primarily targeting the growing demand for housings for sensors, control units, and display systems, for example, which are needed for electrification of vehicle drives and for applications in driver assistance systems through to autonomous driving,” explains Frank Krause, welding technology expert in the High Performance Materials (HPM) business unit at LANXESS. All new compounds are characterized by a high degree of transparency for the light from the near infrared range that is commonly used in laser transmission welding.

Can be automated, is gentle, flexible, and lint-free
In the procedure, a laser beam is sent through a laser-transparent component and absorbed by a second, often black-pigmented component below. This generates heat that melts the surface of the second component. The surface of the first component also melts through heat conduction, so that a material-joining in the form of a weld is created between the two components. The process has several advantages: Thus, it is easy to automate and, compared to vibration, ultrasonic, and infrared welding it is thermally and mechanically less stressing. It allows the joining of 3D contours and hard/soft material combinations. Depending on the size of the component, the cycle times are considerably less than 30 seconds, and the welding flash is if at all extremely low. In addition, welding seams are created without lint. This means, for example, that welded liquid containers do not have to be washed out for cleaning after production.

Flame-retardant and easy to process
One highlight among the new compounds from LANXESS is the halogen-free flame-retardant Durethan AKV30FN04LT. The light transmission for this polyamide 66 is comparatively high in the wavelength range usual for laser welding at wall thicknesses of up to 1.5 millimeters. “The heat input at the boundary layer is thus fast, so that the joining area also melts quickly, which makes economical production possible,” says Krause. The compound shows a very high tracking resistance and achieves the best classification of V-0 (0.4 millimeters) in flammability testing pursuant to the United States’ UL 94 (Underwriter Laboratories Inc.) standard. Its flame-retardant package is optimized with regard to its thermal stability. Injection molding therefore involves a considerably lower risk of deposits forming on the mold surface. The compound contains a heat stabilization system that does without metals and halides. As a result, it has a low tendency to contact corrosion when in contact with conductive parts. This is important, for example, for components in high-voltage batteries or for safety switches.

Tough and low shrinkage
Three other new polyamides have also been optimized for a low tendency to electrocorrosion. Durethan AKV25H3.0LT is particularly suitable as a material for components with high short-term thermal loads. The polyamide 66 is glass fiber reinforced and thermostabilized with a metal- and halogenide-free heat stabilizer. Durethan B31SKH3.0LT, on the other hand, is an unreinforced polyamide 6 and is predestined for components with high toughness requirements. Durethan BG30XH3.0LT is ideal for components that need to be particularly low in distortion and shrinkage such as filigree electronics housings or connector strips. The polyamide 6 is reinforced with a mixture of glass fibers and microglass beads.

Good laser transparency even with thicker walls
Product innovations in polyesters are Pocan C1202LT and C3230LT. Both materials are blends of PBT and polycarbonate (PC). The proportion of amorphous polycarbonate results in excellent laser transparency even with thicker walls. The strength of the unreinforced Pocan C1202LT is its high toughness and low warpage. It is already being used in the production of a tailgate handle system with waterproof sealed electronics. Pocan C3230LT contains 30 percent by weight of glass fibers and is designed for applications that require good stiffness and strength such as electronic housings. Despite the glass fiber reinforcement, it has low distortion and produces good surface qualities.

In addition, new laser-transparent PBT grades with very good hydrolysis stabilization are well advanced in development. “These materials are a challenge because additives for hydrolysis stabilization usually reduce laser light transparency,” explains Krause. Potential applications for the new products are geometrically complex housings of sensors and control units in the engine compartment that are exposed to moist heat.

Forward-Looking Statements
This company release contains certain forward-looking statements, including assumptions, opinions, expectations and views of the company or cited from third party sources. Various known and unknown risks, uncertainties and other factors could cause the actual results, financial position, development or performance of LANXESS AG to differ materially from the estimations expressed or implied herein. LANXESS AG does not guarantee that the assumptions underlying such forward-looking statements are free from errors nor does it accept any responsibility for the future accuracy of the opinions expressed in this presentation or the actual occurrence of the forecast developments. No representation or warranty (expressed or implied) is made as to, and no reliance should be placed on, any information, estimates, targets and opinions, contained herein, and no liability whatsoever is accepted as to any errors, omissions or misstatements contained herein, and accordingly, no representative of LANXESS AG or any of its affiliated companies or any of such person's officers, directors or employees accept any liability whatsoever arising directly or indirectly from the use of this document.

LANXESS (lanxess.com) is a leading specialty chemicals company with sales of EUR 9.7 billion in 2017 and about 19,200 employees in 25 countries. The company is currently represented at 74 production sites worldwide. The core business of LANXESS is the development, manufacturing and marketing of chemical intermediates, additives, specialty chemicals and plastics. LANXESS is listed in the leading sustainability indices Dow Jones Sustainability Index (DJSI World and Europe) and FTSE4Good.

 
 
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LANXESS Introduces New Polyamides and Polyesters for Laser Transmission Welding

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PBT Compounds | LANXESS
Contact: Michael Fahrig - LANXESS.com 
+49 221 8885 5041 michael.fahrig[.]lanxess.com
 
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