Influence of binary combined systems of antioxidants on the stabilization of peroxide‐cured low‐density polyethylene

Abstract

The secondary antioxidants Irganox 168 and 242 and dilaurylthiodipropionate (didodecyl-3,3 0 -thiodipropionate) (DLTP) were chosen to be combined with the primary phenol antioxidants Irganox 300, 1010, 1035, and 1076, and the effects of the binary combined systems of antioxidants on the peroxide curing reaction and the long-term stability of crosslinked low-density polyethylene (XLPE) were studied through isothermal dynamic rheological and mechanical testing. The results show that the primary phenol antioxidants with lower melting points had better resistance to scorching and exhibited good synergistic effects with the secondary antioxidants. Irganox 168 had little resistance to scorching, whereas Irganox DLTP had moderate resistance, and Irganox 242 had the greatest resistance. Irganox 168 and DLTP guaranteed the mechanical properties well, whereas Irganox 242 reduced the tensile strength obviously. Irganox 300 and 1035 combined with secondary antioxidants performed poorly in longterm thermal aging test, whereas Irganox 1076 in combination with secondary antioxidants displayed a moderate effect of aging resistance, and Irganox 1010 showed the best effect.

Broadband FIR absorption spectra of low‐density polyethylene sheets containing six different antioxidants and estimation of their contents by chemometric analysis

“…However, if organic polymers are used under a harsh environment or they are processed at high temperatures for a long time, degradation resulting from oxidation would occur [4,5]. In many cases, antioxidants are added to polymeric insulating materials to suppress such oxidative degradation [6][7][8][9][10]. Here, a problem for users of polymeric insulation is that the details of antioxidant added to the polymer are seldom disclosed.…”

Effect of magnesium hydroxide and graphene nanoplatelets on the properties of peroxide cross‐linked linear low‐density polyethylene nanocomposite

“…It was reported that Irganox 1010 had achieved better synergistic effects on the stabilization of peroxide-cured LDPE for long-term aging tests. 43 The FR additive used was MAH, a white powder with purity 95%-100.5%, density of 2.36 g/cm 3 , and catalogue number 12367 was supplied by Alfa Aesar Company. GNPs with purity of 99.5%, particle size of 25 μm, and thickness of 6-8 nm were supplied by Carbon Nanotubes Plus Company.…”

Electrical tree degradation in high‐voltage cable insulation: progress and challenges

“…Some development perspectives of modification by the organic additives include the following: (i) Only the appropriate content of organic additives can suppress the electrical tree propagation. It is promising to investigate the synergistic effect of organic additives on suppressing electrical tree in insulation materials. (ii) The organic additives with macromolecules can increase the interaction between organic additives and molecular chains to reduce their volatilisation, migration and precipitation, such as antioxidants 1035, 1076, 1010 [113]. (iii) The influences of organic additives on the electrical degradation of polymers should be further verified considering the long‐term period and high temperature operation conditions. …”