From the Sector

Textiles are a given in civil engineering: they stabilize water protection dams, prevent runoff containing pollutants from landfills, facilitate the revegetation of slopes at risk of erosion, and even make asphalt layers of roads thinner. Until now, textiles made of highly resistant synthetic fibers have been used for this purpose, which have a very long lifetime. For some applications, however, it would not only be sufficient but even desirable for the auxiliary textile to degrade in the soil when it has done its job. Environmentally friendly natural fibers, on the other hand, often decompose too quickly. The German Institutes of Textile and Fiber Research Denkendorf (DITF) are developing a bio-based protective coating that extends their service life.

Depending on humidity and temperature, natural fiber materials can degrade in the soil in a matter of months or even a few days. In order to significantly extend the degradation time and make them suitable for geotextiles, the Denkendorf team researches a protective coating. This coating, based on lignin, is itself biodegradable and does not generate microplastics in the soil. Lignin is indeed biodegradable, but this degradation takes a very long time in nature.

Together with cellulose, Lignin forms the building materials for wood and is the "glue" in wood that holds this composite material together. In paper production, usually only the cellulose is used, so lignin is produced in large quantities as a waste material. So-called kraft lignin remains as a fusible material. Textile production can deal well with thermoplastic materials. All in all, this is a good prerequisite for taking a closer look at lignin as a protective coating for geotextiles.

Lignin is brittle by nature. Therefore, it is necessary to blend the kraft lignin with softer biomaterials. These new biopolymer compounds of brittle kraft lignin and softer biopolymers were applied to yarns and textile surfaces in the research project via adapted coating systems. For this purpose, for example, cotton yarns were coated with lignin at different application rates and evaluated. Biodegradation testing was carried out using soil burial tests both in a climatic chamber with temperature and humidity defined precisely according to the standard and outdoors under real environmental conditions. With positive results: the service life of textiles made of natural fibers can be extended by many factors with a lignin coating: The thicker the protective coating, the longer the protection lasts. In the outdoor tests, the lignin coating was still completely intact even after about 160 days of burial.

Textile materials coated with lignin enable sustainable applications. For example, they have an adjustable and sufficiently long service life for certain geotextile applications. In addition, they are still biodegradable and can replace previously used synthetic materials in some applications, such as revegetation of trench and stream banks.

Thus, lignin-coated textiles have the potential to significantly reduce the carbon footprint: They reduce dependence on petroleum-based products and avoid the formation of microplastics in the soil.

Further research is needed to establish lignin, which was previously a waste material, as a new valuable material in industrial manufacturing processes in the textile industry.

The research work was supported by the Baden-Württemberg Ministry of Food, Rural Areas and Consumer Protection as part of the Baden-Württemberg State Strategy for a Sustainable Bioeconomy.

Avgol, an Indorama Ventures company and manufacturer of high-performance nonwoven fabric solutions, will be showcasing its latest work in biotransformation technology for polyolefin fibers and nonwoven fabrics at this year’s Hygienix™ event.

Nick Carter, Vice President, Nonwovens Marketing at Avgol, will be a guest speaker at the event, giving a presentation alongside Dr. DeeAnn Nelson, R&D and Innovation Manager with Avgol in North America, on ‘Biotransformation Technology in Polyolefin Fibers and Nonwoven Fabrics, Focus on Fugitive Used Articles’. “Today, the word “sustainability” does not have a unified meaning in the industries we serve,” said Nick. “Perform a regional analysis on any given customer or consumer, delve into a legislative body or advocacy group’s positioning and you will find each are likely to use the word ‘sustainable’ with varying interpretations, implementations, and implications.

The Avgol presentation, part of the Product & Process Innovation in AHPs series, will take place at 2pm on Tuesday, November 16.

From their base at the tabletop event, Nick and the Avgol team will be discussing the global challenge of eliminating incineration, chemical treatment, landfill, dumping and, in particular, fugitive material pollution from non-woven products.

“Following our recent success at Index 20, we will be sharing insight to our research and development strategy with Hygienix attendees, addressing the degradation performance of our products and the path forward for the industry in terms of the use of new bio-colorants, biosurfactants and new technologies. Of course, we will also be demonstrating our latest Forward Innovative Thinking (FITTM) range of hygiene materials too, including natureFITTM”, says Nick Carter.

natureFIT™ is the newest innovation in the Avgol™ technology platform, designed to imbue nonwoven fabrics with additional qualities and benefits that anticipate the shifting demands of the consumer-led retail space. The suite of fabric solutions is focused on replacing elements of spun melt fabric design, where possible, with natural alternatives. The advanced technology affords product designers a significant reduction in polymer consumption to reduce environmental impact while simultaneously enhancing softness and conformability.

Hygienix™ runs from 15 – 18 November 2021 at the Westin Kierland Resort in Scottsdale, Arizona, USA.

•    New, sustainable, ready-to-use solutions for plastic auto parts to support China’s electric vehicle boom
•    Stronger, softer nylon polyamide fibers plus fast processing for clothes, carpets & industrial applications
•    AddWorks blends lower total cost of ownership & reduce production complexity while enhancing performance

Muttenz, May 3, 2018 – Clariant, a world leader in specialty chemicals, introduced new additive solutions for plastics materials at Chinaplas 2018.

“Our innovations focus on higher performance at better convenience for a sustainable future,” says Stephan Lynen, Head of Clariant BU Additives. “At Chinaplas 2018 we demonstrated our technical and market capabilities around the theme of e-mobility. The immense changes in mobility call for lighter, safer and smarter vehicles. We offer new additive solutions, such as AddWorks, and technical capabilities to respond to this demand. We are accompanying this with a series of investments such as new production facilities in China.”

Clariant’s new AddWorks solutions – AddWorksATR 146, AddWorks LXR 568 and AddWorks TFB 117 – are specifically aimed at improving performance and efficiency of plastics materials for compounders, polymer and fiber producers in China’s major plastics manufacturing segments. All three solutions are part of the globally available portfolio.

The full AddWorks portfolio consists of differentiated market-specific synergistic additive blends that streamline production processes and create value for customers while enhancing performance. Each solution is customized to specific market needs, underlined by broader considerations such as emission reduction, and less energy and resource usage.

Sustainability and performance for the world’s largest auto market
To support the significant investment in electric vehicles in China, Clariant launched two additive innovations that improve the lifetime of lightweight automotive parts and under-the-hood applications and reduce VOC emissions in an easy to use single solution.

AddWorks ATR 146 is a new low dosage, sulfur-free heat and light stabilizer for filled polypropylene (TPO) compounds used in interior applications. Its exceptional heat and light stability and long term color retention offers the automotive industry unmatched performance. It shows no surface cracking after 700 hours at 150°C, which enables dashboards, instrument panels, door panels and pillars to maintain their aesthetics longer than with traditional stabilizers. It also contributes to reducing blooming and VOC emissions, supporting the common effort to make automotive interiors healthier and odorless.

AddWorks LXR 568 is a high performance processing stabilizer that helps to prevent plastic resins, especially polyolefins, from degradation at high processing temperatures. For the automotive industry, this reduces the tendency of injection molded polypropylene interior car parts to turn brittle during heat exposure, enabling them to maintain a defect-free surface. It also has low migration and low fogging that support healthier in-cab environments.

AddWorks LXR 568 combines outstanding color and melt flow protection with good resistance to hydrolysis and high thermal stability. This makes it ideal for interior and under-the-hood powertrains and wider application areas such as packaging films. It is available in free-flowing pills and micro-pills which are easy and convenient to use.

Softer, stronger polyamide fibers for clothes, carpets and industrial applications
Within the next three years, China is expected to account for 40% of the world’s nylon production and more than 30% of the nylon resin consumed globally[1]. The new AddWorks TFB 117 offers a number of benefits to help stabilize and smoothen fiber production processes, protect color, and improve heat stability and mechanical properties of fibers. AddWorks TFB 117 ensures smooth spinnability with less filaments breakage, even at low processing temperatures and at high speed spinning up to 5,500 m/min.

Martin P. J. John, Head of BL Performance Additives at Clariant, comments: “AddWorks solutions are an ideal fit with China’s priority of achieving more sustainable production. They save time and reduce complexity along the production process, with easy to use formats that reduce health risk and chemical waste. Our new state-of-the-art production facility in Zhenjiang, China, which opens later this year, is dedicated to the manufacturing of AddWorks to deliver innovative solutions tailored to the needs of the market. Made for China in China.

In addition to AddWorks, Clariant presented Exolit® OP 1400, a highly stable non-halogenated flame retardant enhancing safety during the charging process. It also provides outstanding thermal stability for under the hood applications. Exolit OP 1400 has been awarded the Clariant EcoTain® label for outstanding sustainability and performance.  

Clariant also introduced two ranges of performance waxes that smoothen the production of automotive plastics for under the hood applications, Licowax® and Licocare® RBW. The recently launched Licocare RBW is a series of multi-purpose additives based on crude rice bran wax. They offer better shaping flexibility, better mechanical properties and enhanced surface finish, which results in a reduced rejection rate and a more effective dosage.