From the Sector

Reset
4 results
DITF: Biopolymers from bacteria protect technical textiles Photo: DITF
Charging a doctor blade with molten PHA using a hot-melt gun
23.02.2024

DITF: Biopolymers from bacteria protect technical textiles

Textiles for technical applications often derive their special function via the application of coatings. This way, textiles become, for example wind and water proof or more resistant to abrasion. Usually, petroleum-based substances such as polyacrylates or polyurethanes are used. However, these consume exhaustible resources and the materials can end up in the environment if handled improperly. Therefore, the German Institutes of Textile and Fiber Research Denkendorf (DITF) are researching materials from renewable sources that are recyclable and do not pollute the environment after use. Polymers that can be produced from bacteria are here of particular interest.

Textiles for technical applications often derive their special function via the application of coatings. This way, textiles become, for example wind and water proof or more resistant to abrasion. Usually, petroleum-based substances such as polyacrylates or polyurethanes are used. However, these consume exhaustible resources and the materials can end up in the environment if handled improperly. Therefore, the German Institutes of Textile and Fiber Research Denkendorf (DITF) are researching materials from renewable sources that are recyclable and do not pollute the environment after use. Polymers that can be produced from bacteria are here of particular interest.

These biopolymers have the advantage that they can be produced in anything from small laboratory reactors to large production plants. The most promising biopolymers include polysaccharides, polyamides from amino acids and polyesters such as polylactic acid or polyhydroxyalkanoates (PHAs), all of which are derived from renewable raw materials. PHAs is an umbrella term for a group of biotechnologically produced polyesters. The main difference between these polyesters is the number of carbon atoms in the repeat unit. To date, they have mainly been investigated for medical applications. As PHAs products are increasingly available on the market, coatings made from PHAs may also be increasingly used in technical applications in the future.

The bacteria from which the PHAs are obtained grow with the help of carbohydrates, fats and an increased CO2 concentration and light with suitable wavelength.

The properties of PHA can be adapted by varying the structure of the repeat unit. This makes polyhydroxyalkanoates a particularly interesting class of compounds for technical textile coatings, which has hardly been investigated to date. Due to their water-repellent properties, which stem from their molecular structure, and their stable structure, polyhydroxyalkanoates have great potential for the production of water-repellent, mechanically resilient textiles, such as those in demand in the automotive sector and for outdoor clothing.

The DITF have already carried out successful research work in this area. Coatings on cotton yarns and fabrics made of cotton, polyamide and polyester showed smooth and quite good adhesion. The PHA types for the coating were both procured on the open market and produced by the research partner Fraunhofer IGB. It was shown that the molten polymer can be applied to cotton yarns by extrusion through a coating nozzle. The molten polymer was successfully coated onto fabric using a doctor blade. The length of the molecular side chain of the PHA plays an important role in the properties of the coated textile. Although PHAs with medium-length side chains are better suited to achieving low stiffness and a good textile handle, their wash resistance is low. PHAs with short side chains are suitable for achieving high wash and abrasion resistance, but the textile handle is somewhat stiffer.

The team is currently investigating how the properties of PHAs can be changed in order to achieve the desired resistance and textile properties in equal measure. There are also plans to formulate aqueous formulations for yarn and textile finishing. This will allow much thinner coatings to be applied to textiles than is possible with molten PHAs.

Other DITF research teams are investigating whether PHAs are also suitable for the production of fibers and nonwovens.

Source:

Deutsche Institute für Textil- und Faserforschung (DITF)

16.11.2022

AkzoNobel launches sustainable biocide-free range for boaters

Recreational boaters now have an easy way to be more sustainable following the introduction of a new biocide-free (B-Free) fouling control range from AkzoNobel’s Yacht Coatings business.

The first product to be launched from the new B-Free range is B-Free Explore. It features a specially-developed, unique silicone polymer technology which produces an exceptionally smooth and slick hull – helping to reduce drag.

Fouling is controlled by preventing microorganisms such as barnacles, slime and algae from forming strong bonds with the hull of the boat. Any that do adhere can be simply wiped away by hand or water jet.

“We’ve developed high-performance technology which allows boaters to maintain a clean, smooth hull,” explains Simon Parker, Director of AkzoNobel’s Marine and Protective Coatings business. “It’s based on proven technology and exemplifies the restless spirit of innovation which has been the cornerstone of our International brand for more than 140 years.”

Recreational boaters now have an easy way to be more sustainable following the introduction of a new biocide-free (B-Free) fouling control range from AkzoNobel’s Yacht Coatings business.

The first product to be launched from the new B-Free range is B-Free Explore. It features a specially-developed, unique silicone polymer technology which produces an exceptionally smooth and slick hull – helping to reduce drag.

Fouling is controlled by preventing microorganisms such as barnacles, slime and algae from forming strong bonds with the hull of the boat. Any that do adhere can be simply wiped away by hand or water jet.

“We’ve developed high-performance technology which allows boaters to maintain a clean, smooth hull,” explains Simon Parker, Director of AkzoNobel’s Marine and Protective Coatings business. “It’s based on proven technology and exemplifies the restless spirit of innovation which has been the cornerstone of our International brand for more than 140 years.”

Adds Jemma Lampkin, Global Commercial Director for AkzoNobel’s Yacht Coatings business: “Boaters are becoming more aware of the impact they can have on the environment, but they still require technologies that deliver high-performance fouling control. B-Free Explore provides a stand-out solution for both of these challenges.”

Specially crafted for the leisure boat market, B-Free Explore is the culmination of a five-year development program. It can be applied to new hulls or directly to existing antifouling, without the need for the removal of the previous antifouling coating. This makes it simple for boaters to upgrade from their traditional coatings to the new technology.

The new product is also better for the marine ecosystem. Being biocide-free, it provides a smooth surface for improved hull efficiencies, which can lead to a reduced carbon footprint.

Currently being introduced in Northern Europe, B-Free Explore will be rolled out across Germany, the Netherlands, Norway and Sweden in January 2023.

More information:
AkzoNobel Coatings Polymere
Source:

AkzoNobel

MaruHachi/AMAC: High-temperature thermoplastic tapes and laminates (c) MaruHachi
16.02.2021

MaruHachi/AMAC: High-temperature thermoplastic tapes and laminates

With their recently installed high-temperature unidirectional tape line, Japan-based composites manufacturer MaruHachi enables new opportunities for high-end applications in demanding market segments like aerospace, automotive or others outperforming traditional materials based on PP and PA which are already widely available.

In the first phase, MaruHachi will produce up to 40 tons/year and focuses now specifically on high-temperature thermoplastic uni-directional (UD) tapes and multi-layer sheet laminates. The material is based on high-performance fibers like carbon, aramid, glass or natural fibers and the matrix can be high-performance polymers like PPS, PEEK or other higher temperature polymers, which are much tougher than epoxies and easy to recycle. With a width of 500 mm, a specific weight from 60 to 350 g/m2, depending on the chosen material, the lines can operate under temperatures up to 420 degrees Celsius. Working under these extremely high temperatures allows for better material properties of the final application, higher performance, increased resistance and integrated high-performance functionalities e.g. by overmoulding.

With their recently installed high-temperature unidirectional tape line, Japan-based composites manufacturer MaruHachi enables new opportunities for high-end applications in demanding market segments like aerospace, automotive or others outperforming traditional materials based on PP and PA which are already widely available.

In the first phase, MaruHachi will produce up to 40 tons/year and focuses now specifically on high-temperature thermoplastic uni-directional (UD) tapes and multi-layer sheet laminates. The material is based on high-performance fibers like carbon, aramid, glass or natural fibers and the matrix can be high-performance polymers like PPS, PEEK or other higher temperature polymers, which are much tougher than epoxies and easy to recycle. With a width of 500 mm, a specific weight from 60 to 350 g/m2, depending on the chosen material, the lines can operate under temperatures up to 420 degrees Celsius. Working under these extremely high temperatures allows for better material properties of the final application, higher performance, increased resistance and integrated high-performance functionalities e.g. by overmoulding.

Since 2017, MaruHachi Group is active in the European market in cooperation with Dr. Michael Effing,the CEO of AMAC GmbH, who advises and supports the company strategically. The established, family-owned MaruHachi Group has a strong history in automotive and medical textiles and has been active in the innovative composites market for more than 15 years.

Toshi Sugahara, CEO of MaruHachi: “For many years, we have already been cooperating with domestic and international partners on high-demand applications and therefore, MaruHachi decided now to invest over 1 million EUR in this new line in phase 1, including a funding participation from the Japanese government NEDO. New developments in phase 2 will be be undertaken by end of 2021 on the downstream technologies like the automated preforming and consolidation. With our new products, we want to contribute to significant weight reductions of the final products, thus improve energy efficiency while offering a cost-efficient and high-quality solution.”

Dr. Effing, CEO of AMAC GmbH confirms: „The focus on the niche of high-temperature products based on PPS and PEEK allows MaruHachi on very demanding high-end applications such as structural frames on space and aircrafts, aircraft seats or engine components etc. The tapes are fully recyclable and can be processed e.g. with high-speed with laser-based tape placement machines and robots.”

Source:

AMAC GmbH

21.01.2021

Toray Industries, Inc: Textil inspiriert von japanischem Papier

Ein neu entwickeltes Gewebe des Materialtechnologiekonzerns Toray verbindet Haptik und Struktur von handgeschöpftem japanischem Papier mit moderner Funktionalität.

Mit Camifu präsentiert Toray Industries, Inc. ein neuartiges Polyester-Filamentgewebe inspiriert von der Optik und Haptik japanischen Papiers. Das Material basiert auf dem patentierten Mehrkomponenten-Spinnverfahren NANODESIGN, das es Toray erlaubt, unterschiedliche Polymere innerhalb einer Faser präzise anzuordnen und zu formen. Die resultierende Struktur mit ihren feinen Unebenheiten ist der von handgeschöpftem Papier nachempfunden, weist jedoch zugleich die Weichheit und den Komfort synthetischer Fasern auf.

Mithilfe des NANODESIGN-Verfahrens entwickelte Toray eine Faser mit einer flachen, C-förmigen Querschnittstruktur, die drei unterschiedliche Polymere miteinander verbindet. In der Fasermitte befindet sich ein lösliches Polymer, rechts und links davon sind Polymere mit unterschiedlichen Wärmeschrumpfungseigenschaften angeordnet. Eines der Polymere wurde dabei aus recycelten Folienresten hergestellt, um die Nachhaltigkeit von Camifu zu erhöhen.

Ein neu entwickeltes Gewebe des Materialtechnologiekonzerns Toray verbindet Haptik und Struktur von handgeschöpftem japanischem Papier mit moderner Funktionalität.

Mit Camifu präsentiert Toray Industries, Inc. ein neuartiges Polyester-Filamentgewebe inspiriert von der Optik und Haptik japanischen Papiers. Das Material basiert auf dem patentierten Mehrkomponenten-Spinnverfahren NANODESIGN, das es Toray erlaubt, unterschiedliche Polymere innerhalb einer Faser präzise anzuordnen und zu formen. Die resultierende Struktur mit ihren feinen Unebenheiten ist der von handgeschöpftem Papier nachempfunden, weist jedoch zugleich die Weichheit und den Komfort synthetischer Fasern auf.

Mithilfe des NANODESIGN-Verfahrens entwickelte Toray eine Faser mit einer flachen, C-förmigen Querschnittstruktur, die drei unterschiedliche Polymere miteinander verbindet. In der Fasermitte befindet sich ein lösliches Polymer, rechts und links davon sind Polymere mit unterschiedlichen Wärmeschrumpfungseigenschaften angeordnet. Eines der Polymere wurde dabei aus recycelten Folienresten hergestellt, um die Nachhaltigkeit von Camifu zu erhöhen.

Werden diese angrenzenden Polymere wärmebehandelt, verbiegen sie sich entsprechend ihrer jeweiligen Wärmeeigenschaften entlang der Faser. In Verbindung mit der flachen Querschrittstruktur erzeugt dies eine einzigartige Verdrehung und Ausdehnung.
So entstehen Faserbündel mit unregelmäßigen Hohlräumen, die für die charakteristische Unebenheit des Materials sorgen.

Der hohe Anteil an Hohlräumen verleiht dem Gewebe eine leichte und zugleich robuste Haptik, die der von japanischem Papier entspricht. Auch optisch folgt Camifu diesem Vorbild: Die Fasern enthalten unterschiedlich eingefärbte oder einfärbbare Polymere, die sich nicht aneinander ausrichten.

Camifu eignet sich damit für Anwendungen in der Herren- und Damenoberbekleidung, darunter Hemden, Blusen, geschnittene und genähte Kleidungsstücke. Das Unternehmen plant, Camifu ab Frühjahr/Sommer 2022 auf den Markt zu bringen

Source:

Storymaker GmbH