Abstract:
A process for devulcanizing fluoroelastomers having a fluorine content between 62% and 74% by weight vulcanized by ionic systems, preferably selected from bisphenol A and bisphenol AF, i.e. 2,2-bis(4-hydroxyphenyl)hexafluoropropane, said process being characterized in that it comprises a step of heating said vulcanized fluoroelastomers in the presence of a hydrolysis composition consisting of one or more chemical selected from water, water soluble alcohols, water soluble glycols and mixtures thereof, at a temperature from 350°C to 430°C. Fluoroelastomers obtainable by said process and their use for the preparation of compounds and vulcanized compositions are also described.
Abstract:
A method for extraction of a polyester polymer composed of a complex mixture of interesterified, long-chain ω-hydroxy acid with typically a 16- or 18-carbon skeleton from the waste of tomato peels. The method provides a thermal treatment of the tomatoes peels, in which tomato peels are immerged in an alkaline solution; a filtration phase, for separating solid residue by liquid; then the liquid is kept for a step of acidification adding an inorganic acid until the solution changes its color so that the pH of the solution after the color changing is comprises in the interval 5-6. Follow a centrifugation phase, in which the solution is centrifuged at a range of 10000-14000 rpm for 15-20 minutes; after the centrifugation the supernatant is discarded or reintroduced in the process for another extraction, while the solid residue is kept and centrifuged with water DDW from 1 to 3 times in the same conditions; these further steps having the scope of washed/cleaned the solid residue.
Abstract:
La présente invention concerne un dispositif de traitement de matériau solide composite, composé par exemple de fibres de carbone solidifié par de la résine. L'invention permet notamment de séparer la résine des fibres afin ensuite de les réutiliser. Les pièces à traiter sont mises dans un panier qui est placé dans un réacteur du dispositif. Le réacteur est ensuite fermé et un solvant est injecté. Des moyens de montée en température du réacteur et en pression s'appliquent dans ladite enceinte de nature à provoquer une réaction de solvolyse ou de dissolution du matériau pendant une durée déterminée. Un moyen d'oscillation déplace le réacteur afin d'exercer un déplacement du matériau solide composite au sein du réacteur pendant la durée déterminée. De cette manière, les éléments placés dans le réacteur sont brassés de façon à présenter un contenu homogène tout au long du traitement.
Abstract:
The invention relates to techniques for processing organic waste and can be used in the chemical and rubber industry for producing fuel analogues and ingredients for rubber blends from petrochemical feedstock waste. The method for processing scrap rubber involves feeding scrap into a reactor, thermally decomposing the scrap in the reactor in the presence of a heat transfer medium, passed through the scrap layer, to form a gas phase and a solid phase, removing the gas phase from the reactor, removing the solid phase from the reactor by moving a container with the solid phase therein from the reactor into a first chamber upon completion of the thermal decomposition process, unloading the solid phase and subjecting same to electromagnetic treatment, separating a liquid phase from the gas phase by cooling the latter, separating water from the liquid phase, combusting the gas phase and subsequently repeating the process with scrap being fed into the reactor in a movable container from a second chamber. The container is moved from the reactor into the second chamber upon completion of the thermal decomposition process. The invention makes it possible to reduce energy expenditure and to reduce harmful emissions into the environment during organic waste processing, and also to improve the quality of the products obtained.
Abstract:
A process for devulcanizing fluoroelastomers having a fluorine content between 62% and 74% by weight vulcanized by ionic systems, preferably selected from bisphenol A and bisphenol AF, i.e. 2,2-bis(4-hydroxyphenyl)hexafluoropropane, said process being characterized in that it comprises a step of heating said vulcanized fluoroelastomers in the presence of a hydrolysis composition consisting of one or more chemical selected from water, water soluble alcohols, water soluble glycols and mixtures thereof, at a temperature from 350°C to 430°C. Fluoroelastomers obtainable by said process and their use for the preparation of compounds and vulcanized compositions are also described.
Abstract:
An amorphous copolyester comprising the reaction product of (a) a monomer of formula (I) wherein R 1 , R 2 , R 3 , and R 5 are each independently a C 1-3 alkyl group, a is 0-1, b is 0-4, c is 0- 4 and d is 0-3, and each R 4 is independently hydrogen or a C 1-3 alkyl group; (b) a terephthalyl component selected from terephthalic acid, a di(C 1-3 alkyl) terephthalate, and combinations thereof, derived from a terephthalyl-containing polyester; and (c) 1,4-cyclohexane dimethanol; wherein the monomer (a) units are present in an amount from 7 to less than 12 mole% of the copolyester based on the total moles of repeat units in the copolyester; and the copolyester has a glass transition temperature of at least 107C, an intrinsic viscosity of at least 0.7 dl/g, and a molded sample has a Notched Izod value of at least 290 J/m determined in accordance with ASTM D256.
Abstract:
A barrier packaging material containing a composite which comprises i) a cellulosic layer; ii) at least one metal layer which will dissolve under alkaline conditions; and iii) at least one polymer layer, in which the polymer is hydrolysable under alkaline conditions. The invention also relates to articles comprising the barrier packaging material. Further, the invention concerns the use of a polymer, which is hydrolysable under alkaline conditions, as a protective layer in barrier packaging products. In addition the present application is also concerned with a method for recycling the aforementioned barrier packaging products. Specifically the barrier packaging products are initially taken in an aqueous wastepaper suspension which is either pulped in an alkaline medium and/or treated in an alkaline medium in a deinking process and in which the metal and polymer are then separated from the cellulosic fibres contained in the cellulosic layer.
Abstract:
Disclosed herein are methods of reforming or recycling infusible, insoluble alkyd resins into new shapes and forms. The insoluble alkyd resins that are reformed or recycled can include pellets, powders, chips, chunks, scraps, pulverized articles, and mixtures thereof. Also disclosed herein are alkyd resins that have been reformed into shaped articles that have traditionally been made with thermoplastics. The shapes of the reformed alkyd resins can include pellets, films, sheets, fibers, nonwovens, and molded articles.
Abstract:
The invention relates to a method for the hydrolysis of at least one isocyanate adduct, with a hydrolyzing agent, characterized in that the hydrolyzing agent contains water and at least one imidazole of the following structural formula, where R1 is a alkyl group having 1 to 5 carbon atoms, preferably 1 to 3 carbon atoms, more preferably 1 to 2 carbon atoms, and most preferably having one carbon atom, and R2, R3 and R4 independently of each other are hydrogen (H) or are alkyl groups having 1 to 5 carbon atoms, preferably 1 to 3 carbon atoms, more preferably 1 to 2 carbon atoms, and most preferably having one carbon atom. The invention further relates to the use of starting substances for the described method.