The Experts below are selected from a list of 24 Experts worldwide ranked by ideXlab platform
Sergei V. Levchik - One of the best experts on this subject based on the ideXlab platform.
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Commercial flame retardancy of unsaturated polyester and Vinyl Resins: review
Journal of Fire Sciences, 2004Co-Authors: Edward D. Weil, Sergei V. LevchikAbstract:Chlorendic acid-based and tetrabromophthalate polyesters are major flame-retardant polyester Resins, often used with antimony trioxide. For translucency, colloidal antimony pentoxide is preferred. ...
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Commercial Flame Retardancy of Unsaturated Polyester and Vinyl Resins: Review
2003Co-Authors: Edward D. Weil, Sergei V. LevchikAbstract:ABSTRACT: Chlorendic acid-based and tetrabromophthalate polyesters are major flame-retardant polyester Resins, often used with antimony trioxide. For translucency, colloidal antimony pentoxide is preferred. Brominated diols are occasionally used. In the Vinyl ester group, the adducts of acrylic or methacrylic acid with the diglycidyl ether of tetrabromobisphenol A are prodominant, and the styrene-cured Resins often have advantageous physical properties and hydrolytic stability. Low styrene versions have air pollution advantages. Hydrated mineral fillers, notably ATH, are widely used at high loadings. ATH tend to reduce smoke, as does use of MMA instead of styrene. Oligourethane unsaturated Resins, cured with MMA, also favor low smoke. Triethyl phosphate and dimethyl methylphosphonate enable viscosity reduc-tion and enhance flame retardancy. Red phosphorus, ammonium polyphosphate and a char-forming organophosphate have also found niches. Phosphorus-containing reactives have been largely unsuccessful. In situ melamine phosphate shows promise. Protective veils offer an alternative to flame retarding the resin itself. KEY WORDS: review, polyester Resins, Vinyl ester Resins, halogenated Resins, phosphorus-containing Resins, alumina trihydrate, ammonium polyphosphate, veils. *Author to whom correspondence should be addressed
Edward D. Weil - One of the best experts on this subject based on the ideXlab platform.
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Commercial flame retardancy of unsaturated polyester and Vinyl Resins: review
Journal of Fire Sciences, 2004Co-Authors: Edward D. Weil, Sergei V. LevchikAbstract:Chlorendic acid-based and tetrabromophthalate polyesters are major flame-retardant polyester Resins, often used with antimony trioxide. For translucency, colloidal antimony pentoxide is preferred. ...
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Commercial Flame Retardancy of Unsaturated Polyester and Vinyl Resins: Review
2003Co-Authors: Edward D. Weil, Sergei V. LevchikAbstract:ABSTRACT: Chlorendic acid-based and tetrabromophthalate polyesters are major flame-retardant polyester Resins, often used with antimony trioxide. For translucency, colloidal antimony pentoxide is preferred. Brominated diols are occasionally used. In the Vinyl ester group, the adducts of acrylic or methacrylic acid with the diglycidyl ether of tetrabromobisphenol A are prodominant, and the styrene-cured Resins often have advantageous physical properties and hydrolytic stability. Low styrene versions have air pollution advantages. Hydrated mineral fillers, notably ATH, are widely used at high loadings. ATH tend to reduce smoke, as does use of MMA instead of styrene. Oligourethane unsaturated Resins, cured with MMA, also favor low smoke. Triethyl phosphate and dimethyl methylphosphonate enable viscosity reduc-tion and enhance flame retardancy. Red phosphorus, ammonium polyphosphate and a char-forming organophosphate have also found niches. Phosphorus-containing reactives have been largely unsuccessful. In situ melamine phosphate shows promise. Protective veils offer an alternative to flame retarding the resin itself. KEY WORDS: review, polyester Resins, Vinyl ester Resins, halogenated Resins, phosphorus-containing Resins, alumina trihydrate, ammonium polyphosphate, veils. *Author to whom correspondence should be addressed
Padilla Caluña, Alex Patricio - One of the best experts on this subject based on the ideXlab platform.
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Diseño de un reactor para la fabricación de resinas vinílicas utilizadas en la elaboración de colas blancas en la Empresa Pintuglobal del cantón Mocha.
'Escuela Superior Politecnica de Chimborazo', 2017Co-Authors: Padilla Caluña, Alex PatricioAbstract:La presente investigación es diseñar un reactor para la fabricación de resinas vinílicas utilizadas en la elaboración de colas blancas en la empresa pintuglobal del Cantón Mocha provincia de Tungurahua, en donde se ha utilizado el método inductivo que nos permitió realizar determinaciones de laboratorio donde se obtuvieron los parámetros específicos requeridos (temperatura y concentración), los cuales van a convertirse en nuestro punto de partida para el dimensionamiento del reactor, también utilizamos el método experimental para explicar cómo se obtuvo la resina vinílica por el método de Adición, en el cual vamos a especificar las concentraciones de los reactivos a utilizarse, la capacidad real y teórica del reactor y las temperaturas adecuadas para poder controlar la reacción de polimerización y por último el tiempo necesario que requiere la reacción para polimerizar, en función de ensayos y un banco de pruebas mediante el proceso de simulación se obtuvieron datos experimentales como: velocidad de agitación de 60 rpm, temperatura de reacción 55 o C, flujo de adición de monómero 0,3cm 3 /min, flujo de adición de persulfato de potasio 0,2cm 3 /min y el tiempo necesario para la polimerización total del monómero que es de 6 horas, por lo tanto concluimos con la validación del diseño de ingeniería para el reactor Tipo Batch mediante ensayos de laboratorio, y se obtuvieron los siguientes datos: porcentaje de solidos a 105°C de 36,80%, viscosidad de 37050 cP y un pH de 4,3, dichos parámetros están dentro de lo contemplado en la norma de la empresa pintuglobal y también está sustentada en la norma NTE INEN-ISO 3219, una vez puesto en marcha la investigación, se recomienda a la empresa pintuglobal realizar una matriz de riesgos, identificando como principal riesgo la manipulación de reactivos químicos como el monómero vinil acetato (VAM) y el Persulfato de Potasio.The present research deals with the design of a reactor to make Vinyl Resins used in the production of white glues at the company Pintuglobal, Canton Mocha, Province of Tungurahua, where the inductive method was used to make laboratory determinations obtaining specific parameters required: temperature and concentration, which became the starting point to dimension the reactor, also the experimental method was used to explain how the Vinyl resin was obtained. By the Add method, the reagent concentrations of reactives, the actual and theoretical capacity of the reactor and the temperatures suitable for controlling the polymerization reaction were specified; and finally, the time required for the reaction to polymerize. In the function of tests and a test bench, through the simulation process, the experimental data were obtained as: stirring speed of 60rpm, reaction temperature 55 o C, flow of monometer addition, 0,3cm xvi 3 /min, flow of addition of Potassium persulphate 0,2cm 3 /min and the time required for polymerization; total of the monometer 6hs, therefore, it concluded with the validation of the engineering design for the Type Batch reactor by means of laboratory tests, and they were obtained: percentage of solids at 150 o C of 36,80%, viscosity of 37050 cP and a pH Of 4.3; These parameters are within the contemplated in the standard of the company Pintuglobal and based on NTE INEN-ISO 3219 norm. Once the research is started, Pintuglobal is recommended to perform a risk matrix, identifying the manipulation of reagents such as the Vinyl acetate monomer (VAM) and Potassium Persulfate
E Pereira - One of the best experts on this subject based on the ideXlab platform.
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metal ion binding properties of synthetic Vinyl Resins
Angewandte Makromolekulare Chemie, 1994Co-Authors: Bernabe L Rivas, H A Maturana, E PereiraAbstract:The synthesis of a water-insoluble chelating resin was carried out by radical copolymerization of 4-Vinylpyridine and N-hydroxymethyl acrylamide with subsequent crosslinking. Both the crosslinked reference homopolymers of 4-Vinylpyridine and N-hydroxymethyl acrylamide were also synthesized. The Resins were characterized by elemental analyses and FT-IR spectroscopy. The ability of these Resins to bind copper(II), iron(II), iron(III) and uranyl ions as well as the elution of the metal ions from the loaded Resins were studied. For uranyl ions, pH 1 was the optimum sorption pH value for all the Resins. Sorption selectivity from the binary mixture Cu(II) + U(VI) was studied at the optimum sorption pH value. Finally, the uranium(VI) sorption isotherms, binding constants, and ΔG°, ΔH° and ΔS° corresponding to the uranium(VI) sorption process were calculated. Ein wasserunlosliches chelatisierendes Polymerharz wurde durch radikalische Copolymerisation von 4-Vinylpyridin und N-Hydroxymethylacrylamid und anschliesende Vernetzung hergestellt. Die beiden ebenfalls vernetzten Homopolymeren von 4-Vinylpyridin bzw. N-Hydroxymethylacrylamid wurden ebenfalls synthetisiert. Die Polymeren wurden mittels Elementaranalyse und FT-IR Spektroskopie charakterisiert. Die Adsorptionseigenschaften dieser Harze fur Cu(II)-, Fe(II)-, Fe(III)- und U(VI)-Ionen und die Elution dieser Metallionen von den beladenen Harzen wurde untersucht. Der optimale pH-Wert fur die Aufnahme von Uranylionen liegt bei 1. Bei diesem pH-Wert wurde die Selektivitat der Harze fur die Aufnahme der Ionen aus der binaren Mischung Cu(II)/U(VI) untersucht. Fur die Sorption von Uranylionen wurden die Adsorptionsisothermen, die Bindungskonstanten sowie ΔG°-, ΔH°- und ΔS°-Werte bestimmt.
Bernabe L Rivas - One of the best experts on this subject based on the ideXlab platform.
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metal ion binding properties of synthetic Vinyl Resins
Angewandte Makromolekulare Chemie, 1994Co-Authors: Bernabe L Rivas, H A Maturana, E PereiraAbstract:The synthesis of a water-insoluble chelating resin was carried out by radical copolymerization of 4-Vinylpyridine and N-hydroxymethyl acrylamide with subsequent crosslinking. Both the crosslinked reference homopolymers of 4-Vinylpyridine and N-hydroxymethyl acrylamide were also synthesized. The Resins were characterized by elemental analyses and FT-IR spectroscopy. The ability of these Resins to bind copper(II), iron(II), iron(III) and uranyl ions as well as the elution of the metal ions from the loaded Resins were studied. For uranyl ions, pH 1 was the optimum sorption pH value for all the Resins. Sorption selectivity from the binary mixture Cu(II) + U(VI) was studied at the optimum sorption pH value. Finally, the uranium(VI) sorption isotherms, binding constants, and ΔG°, ΔH° and ΔS° corresponding to the uranium(VI) sorption process were calculated. Ein wasserunlosliches chelatisierendes Polymerharz wurde durch radikalische Copolymerisation von 4-Vinylpyridin und N-Hydroxymethylacrylamid und anschliesende Vernetzung hergestellt. Die beiden ebenfalls vernetzten Homopolymeren von 4-Vinylpyridin bzw. N-Hydroxymethylacrylamid wurden ebenfalls synthetisiert. Die Polymeren wurden mittels Elementaranalyse und FT-IR Spektroskopie charakterisiert. Die Adsorptionseigenschaften dieser Harze fur Cu(II)-, Fe(II)-, Fe(III)- und U(VI)-Ionen und die Elution dieser Metallionen von den beladenen Harzen wurde untersucht. Der optimale pH-Wert fur die Aufnahme von Uranylionen liegt bei 1. Bei diesem pH-Wert wurde die Selektivitat der Harze fur die Aufnahme der Ionen aus der binaren Mischung Cu(II)/U(VI) untersucht. Fur die Sorption von Uranylionen wurden die Adsorptionsisothermen, die Bindungskonstanten sowie ΔG°-, ΔH°- und ΔS°-Werte bestimmt.