Krems an der Donau, Austria
Krems an der Donau, Austria

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Himsel A.,Competence Center for Wood Composites and Wood Chemistry | van Herwijnen H.W.G.,Competence Center for Wood Composites and Wood Chemistry | Moser J.,Metadynea Austria GmbH | Kantner W.,Metadynea Austria GmbH | And 3 more authors.
European Journal of Wood and Wood Products | Year: 2016

A previously developed rheometer-based method to examine undesired cold tack (“sticking”) of aminoplastic resins to machinery parts was further modified to enable climate depending measurements. It could be shown that both relative humidity and temperature influence sticking, resulting in a variation in the extent of sticking as well as in the time window of occurrence. The laboratory method has been successfully applied to explain cases of sticking in a particleboard factory. © 2015, Springer-Verlag Berlin Heidelberg.


Himsel A.,Competence Center for Wood Composites and Wood Chemistry | Moser J.,Metadynea Austria GmbH | Kantner W.,Metadynea Austria GmbH | Mitter R.,Fritz Egger GmbH and Co. OG | And 3 more authors.
Wood Science and Technology | Year: 2015

Changes in formaldehyde emission guidelines led to changes in the resin formulation. These changes include reduced formaldehyde to urea molar ratio which is followed by a change in reactivity of aminoplastic resins. This resulted in an increased occurrence of an undesired type of tack, herein called “sticking”, which causes addition of resinated wood particles onto machine parts in industrial particle board production. Whereas tack measurements for pressure-sensitive adhesives, such as the probe tack test and rolling ball test exist, mature cold tack tests for liquid formaldehyde-based resins are rare. Practical tests such as “finger-dipping” show limitations in terms of reliability and reproducibility. To measure the sticking behaviour, a rheometer test method is enhanced and modified to quantify influencing factors. The test set-up on a Bohlin CVO rheometer consists of a rotating cylinder which runs over a wood surface coated with resin. The established “glue line” dries out and partially cures, while the torque increases up to a maximum point. This change, caused by “sticking”, is accurately measured and recorded. Influences of different surface temperatures can be observed: the higher the temperature, the faster the drying. In addition, resin age significantly contributed to the sticking effect. Although changes in viscosity are only minor, the torque is highly influenced by resin age, both in measuring time and maximum. Besides temperature and resin age, this method might be useful to describe and investigate further factors influencing sticking issues occurring in the board production process, such as humidity, resin composition, material and surface roughness. © 2015, Springer-Verlag Berlin Heidelberg.


Mahrdt E.,Competence Center for Wood Composites and Wood Chemistry | Stockel F.,TU Braunschweig | van Herwijnen H.W.G.,Competence Center for Wood Composites and Wood Chemistry | Muller U.,University of Natural Resources and Life Sciences, Vienna | And 3 more authors.
Wood Science and Technology | Year: 2015

A new procedure to detect urea–formaldehyde adhesive in industrial particle board is presented. The method uses thin sections stained with a visible dye (gentian violet) and a fluorescent dye (brilliant sulphaflavine), respectively, in a two-step procedure. Microscope images of a selected area of interest acquired in visible and fluorescence modes are combined to obtain sufficient contrast, enabling semi-automated detection of adhesive by means of image analysis. No addition of dye prior to particle board production is necessary. © 2015, Springer-Verlag Berlin Heidelberg.


Himsel A.,University of Natural Resources and Life Sciences, Vienna | Muller U.,University of Natural Resources and Life Sciences, Vienna | Kantner W.,Metadynea Austria GmbH | Moser J.,Metadynea Austria GmbH | And 2 more authors.
Forest Products Journal | Year: 2015

"Sticking" of glued particles onto machine parts (blender, conveyor, forming station) during wood panel production increasingly occurs when applying low-emission aminoplastic adhesives. Therefore, a new and reproducible method to investigate sticking effects was developed. With this setup, both drying out of the adhesive and the tendency of particles to adhere onto machinery components can be described. The method consists of a rotating cylinder made out of different materials and of diverse surface roughness in order to simulate machine parts, which runs over a wood surface where resin is applied. The wood surface represents the wood particles. The temperature of the wood surface and the ambient air as well as the relative humidity can be controlled. Before starting the experiment, a defined amount of adhesive is applied onto the wood surface and with this a "glue line" is built up. Drying out of the adhesive causes an increase of the rolling resistance up to a peak value. Afterward, an abrupt or gradual decrease of the rolling resistance is observed. This rolling resistance is accurately measured and recorded. Using the approach described above, influences of different materials, climate conditions, surface temperature and roughness, as well as adhesive properties can be observed. The initial results provide strong evidence that climate conditions of the ambient air as well as material and surface properties of machine parts show a significant contribution to the phenomenon. ©Forest Products Society 2015.


Patent
Metadynea Austria GmbH | Date: 2015-02-27

A method for producing compounds of formula (I) in which the radical R^(1 )is selected from NH_(2), NH_(2-z )Az, and monovalent alkyl and aryl radicals, the radicals A are selected in each case independently of one another from the phosphoryl radicals DOPO, DPhPO and DPhOPO, and the indices x, y and z, in each case independently of one another, stand for 0 or 1, wherein at least one of the indices is 0, by reacting, in a first step, melamine or, when R^(1 )is an alkyl or aryl radical, the corresponding alkyl or aryl guanamine, with one or more of the corresponding phosphinyl chlorides DOPCI, DPhPCl and DPhOPCI, in order to bond one or more phosphinyl radicals to the amino groups(s) of the melamine or guanamine, and in a second step oxidising the phsophinyl radical(s) by reaction with an oxidising agent to give the corresponding phosphoryl radical(s).


PubMed | Vienna University of Technology and Metadynea Austria GmbH
Type: Journal Article | Journal: Analytical and bioanalytical chemistry | Year: 2016

On-line monitoring of key chemicals in an industrial production plant ensures economic operation, guarantees the desired product quality, and provides additional in-depth information on the involved chemical processes. For that purpose, rapid, rugged, and flexible measurement systems at reasonable cost are required. Here, we present the application of a flexible mid-IR filtometer for industrial gas sensing. The developed prototype consists of a modulated thermal infrared source, a temperature-controlled gas cell for absorption measurement and an integrated device consisting of a Fabry-Prot interferometer and a pyroelectric mid-IR detector. The prototype was calibrated in the research laboratory at TU Wien for measuring methanol and methyl formate in the concentration ranges from 660 to 4390 and 747 to 4610ppmV. Subsequently, the prototype was transferred and installed at the project partner Metadynea Austria GmbH and linked to their Process Control System via a dedicated micro-controller and used for on-line monitoring of the process off-gas. Up to five process streams were sequentially monitored in a fully automated manner. The obtained readings for methanol and methyl formate concentrations provided useful information on the efficiency and correct functioning of the process plant. Of special interest for industry is the now added capability to monitor the start-up phase and process irregularities with high time resolution (5s).


News Article | November 10, 2016
Site: www.eurekalert.org

We frequently encounter polyurethane (PU) foams in everyday life: they are in the insulation in house façades and refrigerators, in car seats, in living room sofas and in shoe soles. PU mostly consists of carbon, hydrogen, nitrogen and oxygen atoms. As the air trapped in the foam's pores also contains oxygen, the foam is highly flammable like most organic polymers and a flame retardant has to be incorporated in it to reduce the risk of fire. In recent decades, foam manufacturers usually used chlorinated phosphate as a flame retardant - a cost-effective additive that doesn't disrupt the production process. However, many of these chlorinated fire retardants are toxic and can evaporate from the foam over time and get into the ambient air. Consequently, these substances are already forbidden in many countries. The industry is urgently looking for environment friendly and non-toxic alternatives. Additionally, the PU foam market is huge: almost 20 million tons of PU foam are produced worldwide every year, the majority of which needs flame retardant additives. Sabyasachi Gaan and his research team patented a family of derivatives based on DOPO (9,10-dihydro-10-oxa-phosphaphenanthrene oxide) which offers the desired properties. In particular, 6,6'-(ethane-1,2-diylbis(azanediyl))bis(6H-dibenzo[c,e][1,2]oxaphosphinine-6-oxide) (EDA-DOPO) fulfills technical, economic and environmental criteria. The PU foams containing EDA-DOPO achieves the highest flame retardant classification in the UL 94 HB. Being a solid at room temperature, it is unable to evaporate from the foam later on and thus offers an excellent solution for transportation sector. The powder also blends in well with the PU foam production process: it mixes very well with polyol, a base material for PU foam, and forms a stable dispersion, which can then be processed easily. The end result is foam where the solid flame retardant EDA-DOPO is finely distributed in the PU cell walls. The prize-winning research project began in June 2013 and was financed with EU/ Swiss (CTI) research funds. Metadynea Austria GmbH and Foampartner Fritz Nauer AG in Wolfhausen were industrial partners. EDA-DOPO is currently produced on a 100-kilogram scale and under REACH Registration process.

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