Reinforcing a testliner with supporting chemical materials

Abstract

The simulation of the chemical interaction of amphoteric polymer resin with sucrose having hydroxyl groups that are similar to cellulose were carried out using 13 C NMR spectroscopy. The transformation of azetidine groups of amphoteric polymer resin proved to result in the formation of covalent chemical bonds between the resin molecules and the hydroxyl groups of sucrose. The mechanism of the interaction of amphoteric polymer resin with cellulose macromolecules was confirmed. The effect of the consumption of amphoteric polymer resin on the physical-mechanical properties of a testliner with different composition was investigated. It was determined that there is a significant increase in the cardboard indices of all studied compositions with an increase in the consumption of resin from 1 to 4 kg per ton. A further increase in the consumption of resin does not practically change the strength of the cardboard, and hence is economically unreasonable. It was found that a greater efficiency of the use of amphoteric polymer resin is achieved when the content of a short-fiber fraction cardboard in the composition grows. It was shown that the consumption of resin of 4 kg per ton and the use of 30% short-fiber waste paper in the composition ensure an increase in the burst resistance and the destructive force during the compression of the ring by 23% and 18%, respectively; these parameters being the main indicators of mechanical strength of the cardboard. This, in turn, will reduce the cost of a testliner. The samples of a testliner with different composition were examined by the SEM method, the samples were fabricated without and with the addition of amphoteric polymer resin. The formation of a dense structure of a cardboard in the case of the use of resin and short-fiber waste paper was shown, this led to an increase in the strength of cardboard.