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Issue 05/2016

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  • Bioplastics
  • Biobased
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  • Renewable
  • Properties
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Polyurethanes &

Polyurethanes & Elastomers Bio-TPU A big step forward in the performance of biobased thermoplastic polyurethanes Figure 1: Density comparison between biobased and petroleum-based TPUs Density ( gr/cc 3 ) 1,24 1,22 1,2 Regular Petroleum-based TPUs 1,18 1,16 1,14 1,12 Pearlthane TM ECO range 1,1 78 80 82 84 86 88 90 92 94 96 Hardness (ShoreA) Recent technological achievements have made the use of renewable raw materials more economically feasible in the plastics industry, including polyurethanes in particular. Now, innovation has been unleashed: new raw materials, adequately formulated, can originate new renewable thermoplastic polyurethane (TPU) with improved performance compared to conventional products. In 2007, Lubrizol (headquartered in Wickliffe, Ohio, USA), the inventor of TPU, was a pioneer as well in the industrial production of biobased TPU. Since then, Lubrizol has continued to advance innovation to develop a full range of biobased solutions. The portfolio of Bio TPU by Lubrizol, commercialized as Pearlthane ECO 12Txx TPU for elastomers, covers a broad range of hardnesses with a biobased content from 30 to 46 % as certified under ASTM D-6866. The distinct composition of Bio TPU by Lubrizol provides important improvements in properties compared to conventional or petroleum-based TPU, including: • Low Density: lower than that of comparable petroleumsourced TPU based on adipates or polycaprolactone copolyester. Bio TPU by Lubrizol is about 10-15% lighter, saving energy and weight. Figure 2: Density comparison between new bio aliphatic development and petroleum-based Aliphatic TPU Density (gr/cc 3 ) 1,15 1,14 Regular Petroleum-based Aliphatic TPUs 1,13 1,12 1,11 1,1 bio-aliphatic TPU range 1,09 1,08 1,07 76 78 80 82 84 86 88 90 Hardness (ShoreA) • Improved Hydrolysis Resistance: this TPU material is more hydrophobic than petroleum-based TPUs and results in an improved hydrolysis resistance. This provides more phase-separate lity of this Bio TPU range is excellent, with d TPUs, thereby lowering the glass transition which strongly improves flexibility at low temperatures. The more phase-separated TPUs are also more crystalline in general, so the injection mouldability of this Bio-TPU range is excellent, with shorter cycle times compared to conventional TPUs. • Good Staining Resistance: because of its more crystalline and hydrophobic nature, generally it has less superficial interaction as compared to conventional TPU. Lab tests were performed based on ASTM D-543, attacking the surface of the TPU with different agents known to be challenging to plastic surfaces, including coffee, vinegar, mustard, sunscreen and lip gloss. These tests confirmed the good results of Bio TPU. • Adhesion: adhesion to polyamides, especially to PA11 and PA12, is much better than that of conventional petroleum-based TPUs. This is because Bio TPU has a similar composition to polyamides. This improved adhesion has been confirmed in numerous industrial applications, including footwear and automotive interiors. The other characteristic properties of Bio TPU, such as mechanical behaviour, colour, transparency and UV-, 56 bioplastics MAGAZINE [05/16] Vol. 11

Polyurethanes & Elastomers temperature- and abrasion resistance are of the same high standard as typically found in high quality TPUs. Further research and development in recent years has resulted in the addition of aliphatic innovation in the Bio TPU product portfolio. The new aliphatic Bio TPU shows the same high performance and similar benefits of the aromatic Bio TPU described above, such as low density (see Fig. 2), plus the additional benefits that follow: • Excellent weatherability and colour stability, providing final applications that stay as beautiful as on the first day, ideal for use in outdoor and other UV-exposed environments. • High transparency with end uses that span from transparent films for paint protection and optical use in automotive, to performance footwear and sports and recreational goods, as well as consumer electronics components such as powder cords, watchbands and mobile device cases. • Excellent haptic features, making them a perfect choice for consumer-facing applications due to their soft, pleasanttouch. Lubrizol complements its Bio TPU offering with Pearlbond ECO 590 TPU for adhesives which has a 67 % biobased content according to ASTM D-6866. This product is suitable for hot melt adhesives such as HMPUR (RHM) and provides higher temperature resistance (higher softening and melting point), better adhesion to polyolefins and a faster crystallization speed which promotes a faster increase of the HMPUR’s cohesive strength. Automotive interior parts, furniture, textile and footwear are the main applications. Bio TPU by Lubrizol is a revolutionary product line of highperforming biobased TPU made with renewable materials, and offering improved hydrolysis and stain resistance, lower density and better adhesion compared to petroleum-based TPU. With a lasting commitment to the responsible use of natural resources and innovations in technologies derived from renewable sources, Lubrizol provides the support needed to ensure better applications outcomes in technically demanding market segments embracing biobased polymers. With decades of experience in polymer and material science, and an efficient global network, today’s material engineers and product designers no longer have to face a trade-off between performance and sustainability. 6A23 By: Daniel Salvatella Strategic Technology Manager Lubrizol Engineered Polymers Montmelo, Barcelona, Spain Table 1: Main properties of Pearlthane ECO range *Food contact grades may be available upon request. High Performance Biobased TPU Shore hardness % Biobased content (according ASTM D-6866) Pearlthane ECO D12T80* 82 A 42 Pearlthane ECO D12T85 85 A 46 Pearlthane ECO D12T90* 91 A 38 Pearlthane ECO 12T95 95 A 32 Pearlthane ECO D12T55D 55 D 29 Table 2: Peel Adhesion (N/cm) at speed of 100 mm/min Polymer TPU Polymer Pearlthane ECO 12T95 Standard TPU 95 Shore A Standard TPU 98 Shore A PA11 25 13 3 bioplastics MAGAZINE [05/16] Vol. 11 57

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