Use of Lignin-Containing Waste of the Pulp and Paper Industry in Obtaining Lign-Epoxy Composite Materials

Abstract

The possibility of processing lignosulfonates to obtain composite materials using ED-20 epoxy resin as a binder was considered. It was shown that powdered lignosulfonates (PLS) play the role of a hardener for epoxy resins and reduce the toxicity of polyethylenepolyamine (PEPA), which is widely used as an industrial hardener, by 50–68 %. The article assesses the possibility of using PLC as a hardener and filler composition. The optimal composition of lignoepoxy compounds was revealed: ED-20 – 60–70 % by weight; PLS – 30–40 % by weight; PEPA – 6–7 % by weight. Biotesting proved that the resulting material does not have toxic properties. It was discovered that these compositions have longterm biostability while maintaining physical and mechanical properties. It was concluded that it is expedient to process powdered lignosulfonates to obtain lignoepoxy compositions suitable as building material and alternatives to wood chip and wood fiber materials.