Termooxidaition destruction of butadiene-nitrile rubbers and industrial waste-Reference-Cited by-同舟云学术

Termooxidaition destruction of butadiene-nitrile rubbers and industrial waste

Published:2022-01-17 Issue:4 Volume:83 Page:308-314
ISSN:2310-1202
Container-title:Proceedings of the Voronezh State University of Engineering Technologies
language:
Short-container-title:Vestn. Voronež. gos. univ. inž. tehnol.

Author:

Shehavtsova T. N.¹^ORCID,Shatalov G. V.²^ORCID,Papkov V. N.¹^ORCID,Karmanova O. V.²^ORCID

Affiliation:

1. Voronezh Department of S.V. Lebedev Research Institute of Synthetic Rubber

2. Voronezh State University of Engineering Technologies

Abstract

The process of thermooxidation destruction of industrial butadiene-nitrile copolymers of the grades SKN-18, SKN-26 and substandard products is investigated. The process is carried out in aromatic solvents (toluene in the xylene) under the influence of air oxygen in the presence of an adduct of the radical initiator azodiisobutyronitrile with N-metilpirrolidone. The mass-average molecular weights of the resulting products were determined by gel permeation chromatography, and molecular weight distribution calculations were performed. The influence of the temperature and the content of the initiator on the change in the intrinsic viscosity of solutions of the resulting degradation products, depending on the time of the process, is considered. Based on a comparative analysis of the destruction parameters using toluene and xylene at 80 °C and an initiator concentration of 0.8% by weight. It was found that the type of solvent and the time of destruction practically do not affect the process of thermooxidative destruction with the production of low molecular weight polymers with a molecular weight of 40 ? 103. It is shown that in the course of the destruction of industrial rubbers differing in the content of acrylonitrile, the process proceeds with the formation of higher molecular weight compounds in rubbers with a higher content of acrylonitrile units. When carrying out the destruction of substandard rubber SKN-26SNT with high Defoe hardness, it is necessary to increase the concentration of the initiator to 1.1% of the mass. and temperature. The mechanism of thermooxidative destruction of the studied polymers is considered. According to the data of IR spectroscopy and chemical analysis, it was found that the products of thermooxidative destruction of nitrile butadiene rubbers contain oxygen-containing functional groups. Thus, a simple commercially method for producing low-molecular-weight butadiene-nitrile polymers based on special-purpose rubbers and substandard product with functional hydroxyl, carboxyl and epoxy groups has been developed.

Publisher

FSBEI HE Voronezh State University of Engineering Technologies

Subject

General Agricultural and Biological Sciences

Reference20 articles.

1. Chernaya A.N., Nikulin S.S. Modification of petroleum polymer resin from the C9 fraction with maleic acid and its use for the protective treatment of wood. Chemical industry today. 2009. no. 4. pp. 28–33. (in Russian).

2. Papkov V.N., Gusev Yu.K., Rivin E.M., Blinov E.V. Butadiene-nitrile rubbers. Voronezh, FGBOU VPO "Voronezh State University of Engineering Technologies", 2014. 218 p. (in Russian).

3. Lonshakova T.I., Chernykh K.A., Utilin I.V. Thermal-oxidative destruction of diene rubbers by molecular oxygen in solution initiated by polymer oxidates. Chemistry and Computer Modeling. Butler messages. 2004. vol. 5. no. 2. pp. 63–67. (in Russian).

4. Tikhomirov S.G., Semenov M.E., Khaustov I.A., Bityukov V.K. et al. Control and prediction of quality parameters of polymers in the process of their destruction in solution. Theoretical foundations of chemical technology. 2018. vol. 52. no. 4. pp. 466–472. (in Russian).

5. Obrecht W., Muller Ju.M., Nuyken O. Process for the metathetic degradation of nitrile rubber. Patent US, no. US 2009076227 A1, 2009.