Water-miscible pigments from tire pyrolysis residues: preparation and physico-chemical characterisation
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PETUHOV, Oleg, TIMBALIUC, Nina, VITIU (BOLDIŞOR), Aliona, CEBAN (GÎNSARI), Irina, CEBOTARI, Irina. Water-miscible pigments from tire pyrolysis residues: preparation and physico-chemical characterisation. In: Achievements and perspectives of modern chemistry, 9-11 octombrie 2019, Chişinău. Chisinau, Republic of Moldova: Tipografia Academiei de Ştiinţe a Moldovei, 2019, p. 185. ISBN 978-9975-62-428-2.
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Achievements and perspectives of modern chemistry 2019
Conferința "International Conference "Achievements and perspectives of modern chemistry""
Chişinău, Moldova, 9-11 octombrie 2019

Water-miscible pigments from tire pyrolysis residues: preparation and physico-chemical characterisation


Pag. 185-185

Petuhov Oleg1, Timbaliuc Nina1, Vitiu (Boldişor) Aliona12, Ceban (Gînsari) Irina1, Cebotari Irina1
 
1 Institute of Chemistry,
2 Institute of Applied Physics
 
 
Disponibil în IBN: 11 noiembrie 2019


Rezumat

pyrolysis lead to the formation of three components: fuel fraction which being subjected to purification to yield gasoline and diesel fuel, steel wire which is recycled and carbon black that is accumulated contaminating the thus environment.This is explained by the specific properties of carbon black: small, hydrophobic particles that easily disperse and pollute the environment, is a possible carcinogen for humans; short-term exposure to high concentrations can cause discomfort in the upper respiratory tract. At the same time, the carbon black obtained from tire pyrolysis, contains a significant amount of fuel and is not miscible in polar solvents such as water.This makes the field of use of carbon black is narrow –it is necessary remove adsorbed fuel from particles and render them hydrophilic properties,thus obtaining a black pigment, the fields of use of which substantially increase:pigment for the production of pavement, decorative mortar, lacquers and paints, supplement for construction and repair of road. Investigated tire pyrolysis residue is a homogeneous, finely dispersed, water-immiscible black mixture. In order to assess the thermal stability of the residue, thermal analysis was performed in a dynamic air atmosphere. Based on the results of the thermal analysis, preventive degassing of the soot at 200-250oC is recommended for evacuate volatile substances for preventing their accumulation and explosion. To obtain a homogeneous product oxidation with air is recommended to be carried out at 350-400oC by continuous mixing. An important parameter of pigments and additives is the specific surface of adsorption. Having a high specific surface area, the pigment better interacts with components of the mixture, contributing to greater homogeneity and stability of mixture. The nitrogen adsorption isotherms at 77K were measured for the initial and oxidized sample. The results of the measurements showed that the specific surface increases significantly from 20 m2/g to 60 m2/g.