Research On The Separable Plastic Of Solvent Polyvinyl Chloride Resin

Separable plastic, containing plastic as main film components, is a kind of antirust material by isolating corrosive medium. It is used widely in anticorrosion for its excellent antirust ability and no pollution.Research is carried out in accordance with the principle of co-positions on approximate solubility parameters. According to the principle, PVC has been selected as the main materials to form the film, and the mixed solvents have been built between cyclohexanone and tetrahydrofuran. With the combination of the uniform experiment and the orthogonal experiment, the whole process has been designed properly: the primary optimum composition of the product has obtained during the first stage; in the orthogonal experiment better product has been produced. The combination of the two kinds of tests design methods improves the efficiency greatly, and makes the test times decreased enormously. The optimal composing (quality proportion) are as follows: PVC 66-72; DBP 20-22; SBS 2-3; nano active CaCO3 7.5-8.5; corrosion inhibitor 6-7; cyclohexanone 165-180; tetrahydrofuran 132-144.Since the EIS resistance reflects the film's corrosion resistance, the electrochemical impedance spectroscopy (EIS) test was adopted to research the corrosion resistance of the separable plastic. The results obtained by EIS test were accordance with that of the traditional soak tests. The corrosion resistance of the film gets strengthening with the increasing of the film's EIS resistance. 50μm is the optimum thickness of film for the best capability/price Ratio of corrosion resistance and the best corrosion resistance of film is the one which contains 6-7 (quality proportion) multiplex corrosion inhibitor A.The film obtained by mixing 4.35-5(quality proportion), double phenol A and 2.9-3.5(quality proportion) triethyl-phosphite could be peeled of easily after heated 115℃for 6 hours, and the film changes color slightly.The tests of withstanding acid, alkali, salt, damp-heat, low temperature resistance, EIS, polarization curve, fiexility and impact strength of the PVC-separable cold type plastic product show that the product has outstanding resistance of chemical reagent, good insulated effect and great mechanical characters.