Chinese Journal of Applied Chemistry ›› 2020, Vol. 37 ›› Issue (1): 32-39.DOI: 10.11944/j.issn.1000-0518.2020.01.190152

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Effect of Polyvinyl Chloride Skin Composition on Vulcanization of Additive Silicone Rubber

WANG Xiaoweia,FU Zhileia,LIU Fanga,PAN Gea,XU Donghhuaa*(),GUAN Dongbob,DOU Yanlib,SHI Tongfeia,YAO Weiguob*()   

  1. aState Key Laboratory of Polymer Physics and Chemistry,Changchun Institute ofApplied Chemistry, Chinese Academy of Sciences,Changchun 130022,China
    b Key Laboratory of Automobile Materials,Ministry of Education,College ofMaterials Science and Engineering,Jilin University,Changchun 130025,China
  • Received:2019-05-24 Accepted:2019-08-28 Published:2020-01-08 Online:2020-01-08
  • Contact: XU Donghhua,YAO Weiguo
  • Supported by:
    Supprted by Changchun Science and Technology Plan Science and Technology Innovation “Double Ten” Project Major Science and Technology Projects(No.17SS016), and the Technology Development Program of Jilin Province Science and Technology Department(No.20190302092GX)

Abstract:

In this paper, the curing kinetics of two-component addition silicone rubber on different polyvinyl chloride (PVC) skins was studied with rheological method. The components of PVC skins were analyzed to determine the mechanism of uncuring of two-component addition silicone rubber by using Fourier transform infrared spectrometer (FTIR), nuclear magnetic resonance (NMR), and inductively coupled plasma mass spectrometer (ICP-MS). The results show that phosphorus (P) is the main element in the PVC skin that causes the difficulty in curing of silicone rubber. At the fixed silicone rubber thickness of 1 mm, when the content(mass fraction) of P element in the PVC is below 3×10-3%, the two-component addition silicone rubber casted on the PVC skin can still be solidified completely; when the content of P in the PVC skin exceeds about 2.4×10-2%, although the intermediate layer of two-component addition silicone rubber can be cured, the layer contacting PVC skins fails to cure, and the thickness of the uncured layer increases with the content of P. Besides, reducing the thickness of silicone rubber to micron on the skin of PVC with P element content less than 3×10-3%, especially less than 2 μm, the silicone rubber can not cure completely. The consequences mentioned above indicate that the curing behavior of two-component addition silicone rubber on the surface of PVC skin containing P element is mainly influenced by the total content of platinum catalyst in silicone rubber and the content of P element in PVC skin, while the reaction rate of two-component addition silicone rubber and diffusion rates of platinum catalyst and P element in the silicone rubber have ffects as well.

Key words: polyvinyl chloride, silicone rubber, mold, rheology