Session 24: Biobased Coatings
Chair: Dr. Sonja Schulte, Vincentz Network, DEBooming energy prices coupled with rising awareness for climate change, CO2 footprinting, material, resource, and energy efficiency are challenging the coatings industry. Use of renewable resources is one option to face this challenge. This session provides examples on what the coatings industry has in store for this increasingly important issue, for instance biobased additives, powder coatings, dispersions and adhesives.
| << Previous Session | Next Session >> |
Wednesday Afternoon 14.00 – 17.30 h
Room Istanbul
24.1 14.00 – 14.30 h Green additives and performance - A contradiction? Heinz-Günther Schulte, Cognis, DE Back in history the first coatings men invented were based on natural materials. This did not change until the development of industrial chemistry in the first decades of the last century when synthetic polymers, resins and binders were developed. These new materials performed better in many aspects like adhesion, durability, corrosion protection or what was not less important during the industrialization: speed of application. Since then many petrochemical products substituted natural materials. But chemical raw materials based on petrochemical resources are limited. A set of new additives was developed based on renewable resources, namely defoamers, coalescents and dispersants. This paper compares the naturally derived products to well established petrochemical counterparts and demonstrates that new naturally derived products can even bring technical and environmental advantages to modern coating systems.  | ||
| 24.2 14.30 – 15.00 h Leveraging fundamental structure-property relationships to develop solutions for compliant coating systems Deepanjan Bhattacharya, Eastman Chemical, US Volatile organic compound (VOC) regulations are driving changes in coating formulations to waterborne technology or to higher solids in solventborne systems. Environmental awareness is leading to pressure to develop ?green? or ?sustainable? products for the coatings industry. The focus of this effort was to gain an understanding of the structure-property-performance relationships of cellulosic additives in waterborne and high solids solventborne coatings in order to better tailor these materials to address ongoing needs in compliant systems. This paper will demonstrate how modification of additive properties such as acid number in waterborne systems, or glass transition temperature (Tg) in solventborne systems lead to corresponding differences in basic properties such as solubility, compatibility, and VOC requirement and how these parameters relate to application, property development, and appearance in a variety of end-use applications including waterborne and solventborne automotive OEM and refinish basecoats. In waterborne systems, acid number correlated strongly with compatibility and solubility, while in solventborne systems, Tg was linked with dry-to-touch and appearance. | ||
| 24.3 15.00 – 15.30 h Toughening of epoxy coating systems with novel biobased materials Erwin Honcoop, Croda, NL The market is looking for possibilities to reduce weight by reduction of the thickness of metal sheets and maintain the protective properties. To meet these needs, there is a demand for more flexible, but tough systems without compromising on the other properties. Epoxy systems have found widespread use in coatings, sealants and adhesives applications. These systems provide hard, highly crosslinked coatings with excellent protective properties. Croda has developed new biobased polyester diacids, which can be grafted on the epoxy. The products induce phase separation, which leads to morphology with low Tg micro-segments, homogeneously distributed inside a rigid matrix, resulting in hard and at the same time tough epoxy systems. Next to bringing good toughening performance, the bulk properties are not sacrificed. Additionally, reduced moisture diffusion has been found which is interesting with respect to water barrier properties. Coating properties in relation with a range of hardeners have been investigated 15.30 – 16.00 h Networking: Refreshments & Coffee Break | ||
| 24.4 16.00 – 16.30 h Bio-based powder coatings Andrea Capra, Hexion Speciality Chemicals, IT Powder Coatings are used in sectors such Architectural, appliances and transportation, they are easy to use, ecologically sound and cost effective. There is a great interest to replace petrochemicals with biobased feedstocks in a wide range of application areas. Hexion developed and is bringing to market a bio-based solution for powder coatings based on renewable resources such as soybeans and corn with the goal of matching or exceeding quality and performance. This technology represents a significant achievement in reducing the petroleum impact and provides a technical advantage in low temperature cure applications. It meets the need of a durable, cost-effective, low temperature thermally cured powder coating suitable not only for metals but also for heat sensitive substrates. The development was focused on creating advantages and efficiencies in the low temperature cure applications without sacrificing appearance and coating performance. Technical success has been demonstrated for chemical and physical properties. | ||
| 24.5 16.30 – 17.00 h High performance waterborne polyurethane dispersions based on natural oil polyoils for wood coating applications Dr. Emile Trottier, Dow Coating Solutions, US Aliphatic polyester polyols have been produced from seed oil with high renewable content and unique properties that enable the formulation of water borne and high solids solvent borne coatings with low volatile organic compounds (VOC) content. Water borne polyurethane dispersions (PUDs) have been developed from anionically stabilized prepolymers of aliphatic isocyanates and natural oil polyols (NOP). The NOP based PUDs are N-methylpyrrolidone (NMP) free and provide coatings with good mechanical properties including hardness, flexibility and abrasion resistance and superior end-use performance attributes including hydrophobicity, hydrolytic stability, acid etch and water resistance compared to adipate and caprolactone based PUDs. This presentation describes the performance benefits of neat and lightly crosslinked NOP PUDs and blends with acrylic latex for wood coating applications in comparison to conventional PUD based systems. | ||
| 24.6 17.00 – 17.30 h Novel amine-functional dimer technology allowing new chemistry for sustainable coatings and adhesives Dr. Angela Smits, Croda, NL Dimerised fatty acids are used in coatings and adhesives, where the low Tg and hydrophobic nature induce flexibility, hydrolytic resistance and adhesion to a wide range of substrates. Croda (former Uniqema) has developed new bio-based, amine-functional building blocks, extending the range of dimer acids, dimer diol and dimer-based polyester polyols. This new technology brings benefits in many applications. In Polyamide hot-melts, the use of dimer diamine extends freedom in formulating, allowing wider melting point adjustment, while improving hydrophobicity. In Epoxy coatings, amine-functional dimer and trimer are low-volatile low-viscosity curatives, allowing high-solids formulations with good flexibility, hydrophobicity, pigment wetting, and excellent durability. In Polyurea coatings, amine-functional dimer and trimer curatives bring about smoother coatings with enhanced impact resistance and outdoor stability, extending both hydrolytic and thermo-oxidative stability. The new amine-functional materials broaden application possibilities and additionally bring clear environmental benefits, through their renewable nature, low volatility and durable applications. | ||
| << Previous Session | Next Session >> |
