OPTIMIZATION OF LOW FLAMMABLE POLYCARBONATE BASED ON POLYMERIC COMPOSITION FOR MOLTEN THREAD 3D-PRINTING TECHNOLOGY

For citation:Platonov M.M., Petrova G.N., Larionov S.A., Barbotko S.L. Optimization of low flammable polycarbonate based on polymeric composition for molten thread 3D-printing technology. Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol. 2017. V. 60. N 1. P. 87-94.This article contains results of composition optimization of thermoplastic polymeric mixture for the development of new low flammable material for molten thread 3D-printing technology. In order to receive qualitive polycarbonate - main material for aviation purpose functional products- a couple of tasks were solved – namely decreasing of polycarbonate melt viscosity and flammability characteristics. On the first step polybutylene terephthalate (PBT) and ABS-plastic were used for decreasing in polymeric melt viscosity. Both PBT and ABS have low viscosity melts. Incorporation of these substances into polycarbonate leads to decreasing in effective viscosity and consequently in processing temperature. On a second step the influence of halogenated fire retardant decabrombiphenyl oxide (DBDFO) in amount of 3-10% on flammability characteristics (combustibility, smoke generation, oxygen index, heat release intensity) of researched mixtures was investigated. Fire retardant incorporation allows decreasing the duration of residual burning from 22 to 1-3 s and thus, transfering material from burning to self-extinguishing type. Investigation of smoke generation shows that all mixtures belong to III group of medium fumed materials with smoke generation properties not exceeding upper level (for this group) – 200 units. Besides, it has been shown that incorporation of DBDFO permits to decrease maximum velocity of heat liberation, 18-40% reduce total amount of liberated heat during first two minutes and 26-40% increase in the time of maximum reaching. It has been figured out that increasing in fire retardant amount leads to insignificant increasing in strength properties, decreasing in tensile strength and deformation characteristics. This may be explained by the presence of fire retardant fractions having lower level strength and deformation properties. In this way basing on the conducted studies it has been shown that polycarbonate mixture comprising rheology modifier and fire retardant possesses viscosity similar as 3D-printing suitable materials (ABS, Nylon-618) and advanced flammability characteristics. Investigation results may be used for creating of aviation interior functional products satisfying to Aviation Rules standards for fire hazard and capable for recycling by 3D-printing technology.