The use of nanoadditives in polyvinylchloride compositions in construction

One of the most common polymers is polyvinylchloride (PVC), which is on the third place after polyethylene and polypropylene in the world in overall production. High demand for PVC is caused by the possibility of its modification and production of wide range of materials and articles with improved properties as well as by cost-advantageous price - performance ratio, availability of raw materials, saving natural resources. Along with many advantages PVC has a serious drawback: abnormally low stability. The observed thermal aging of PVC begins at 100oC, especially intensively the polymer decomposes during processing in the range of 160-180oC. Therefore, to obtain high-quality products based on PVC one needs effective stabilization of polymer, that provides high technology in the processing and long service life without deterioration of consumer properties. An effective way to improve the efficiency of stabilizer is to add available, well-known secondary stabilizers, which action mechanisms are different, namely dipentaerythritol (DPET) that acts as an acceptor of HCI, and dinonylphenol (phosphite NF), that inhibits thermal degradation of PVC interaction with unstable carbonrally groups. The paper presents the results of development of complex stabilizer containing not only heat stabilizer and lubricant but also nanoadditives that are secondary stabilizers dipentaerythritol and phosphite NF. The influence of nanoadditives on the technological properties of PVC-materials has been studied. It is shown that the secondary stabilizers can significantly improve the efficiency of multifunctional stabilizer to provide thermal stability and color stability of PVC- compositions for construction purposes. Testings of friction lubricant with content of multistabilizer taken in dosage of 0.02 wt.h. - phosphite NF, 0.03 wt.h - DPAT 100 wt.h. PVC, in the PVC formulas of the upper and intermediate layers of linoleum and layered linoleum have been performed. It has been determined that the use of a complex stabilizer in the formulas of PVC films favours improvement of operational characteristics of the finished product - a multi-layer polyvinylchloride linoleum, and it contributes to the reduction of specific surface electrical resistance, the absolute residual deformation, abrasion, and changes in linear dimensions.