Kinetic parameters and predicted terms of destruction of lignin-carbohydrate materials based on wood raw materials in relation to the soil

This work determined kinetic parameters and predicted terms of destruction of lignin-carbohydrate materials based on wood raw materials in relation to the soil. The prediction was performed using an extrapolation method based on the rate of change in the properties of the material (bending strength) at elevated temperature (50 °C). As a result of the work performed by the method of flat hot pressing in closed molds, plastic without resins (PWR) based on pine sawdust was obtained, their physical and mechanical properties were evaluated. The obtained samples of PWR were tested for biodegradability under normal (20 °C) and extreme (at elevated temperature) conditions. The biodegradability was assessed by the loss of mass of the studied samples during exposure in the ground. There is a general decrease in the mass s of samples according to the results of holding samples in the ground at a temperature of 20 °C for 30 days.

The total weight reduction for 30 days was 15.4 %. Dependences of changes in physical and mechanical properties (bending strength) were established PWR under normal and extreme conditions of biodegradation tests. The activation energy of the biodestruction process of this material was determined using experimental data. Based on the activation energy, it was revealed that the destruction of PWR occurs due to hydrolysis and decomposition of existing bonds of wood raw materials, mainly lignin-carbohydrate complex. Based on the data obtained, the possible terms of biodegradability of PWR based on wood raw materials were predicted. The predicted terms of biodegradability in real conditions for the warm period of the year at a conditionally average annual temperature in Russia is up to 1.2 years without taking into account external natural factors.

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