Abstract
As a modifying additive in PVC-compositions, silicates produced by means of rice husk processing are of practical interest. Rice husk ash obtained by burning at 350°C, along with synthetic and naturally occurring wollastonite, significantly reduce plasticizer’s migration from the PVC-composition due to their porosity. This is due to the fact that the part of hydroxyl components of the plasticizer EDOS has adsorbed on the surface or retained by the silicates pores. Along with that, Miwoll 10-97 ensures a greater decrease in plasticizer’s migration than synthetic calcium silicate on the base of rice husk ash. When all the researched silicates are modified by the rice husk and naturally occurring wollastonite, heat stability of PVC-compositions grows. This is preconditioned by the alkaline origin of the surface of filling compounds that allows their possible reaction with chlorine hydride released from PVC during thermal decomposition. Synthetic and naturally occurring wollastonite enhance strain-strength properties of PVC-compositions whereas silicates on the case of rice husk reduce these parameters.
Highlights
Polyvinylchloride is one of the most wide spread large-tonnage synthetic polymers applied in the various spheres of national economy [1]
The analysis of the experimental results gives an evidence that rice husk ash obtained by burning at 350°С, due to its high porosity, lowers migration of a plasticizer from the PVC-composition at a greater extent
Experimental data have shown that ash obtained at the temperature of rice husk burning 350°С, as well as naturally occurring and synthetic wollastonite downgrade the migration of a plasticizer contacting in the polyvinylchloride composition
Summary
Polyvinylchloride is one of the most wide spread large-tonnage synthetic polymers applied in the various spheres of national economy [1]. Low temperatures of the start of individual PVC-decomposition and the mechanism of its thermal breakdown determine the necessity of application of plasticizers and modifiers or fillers in the composition of materials. The former lower the temperature of processing and increase elasticity, whereas the latter perform as heat stabilizers and anti-oxidizing agents [2]. Rice husk represents protective coating of rice grains that are dehusked and separated in the milling process. This is an abundantly available by-product of the rice-processing industry and contains about 30÷50% of organic carbon. Bulk density of rice husk is low and lies in the range 90–150 kg/m3
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