XLPE compound for fast cable line speed

Abstract. In this study, thermal, mechanical and fire retardant properties of silane-crosslinked low-density polyethylene (XLPE) containing ethylene-vinylacetate (EVA) copolymer, alumina trihydrate (ATH) and antimony trioxide (Sb2O3) have been studied. Samples were prepared in a single-screw extruder and the silane type was vinyltrimethoxy silane (VTMOS). Incorporation of ATH and Sb2O3 into polyethylene at sufficiently high loading introduces good fire retardancy expressed by limiting oxygen index (LOI). However, some tensile properties decreased. These limitations could be overcome by silane crosslinking. By incorporation of EVA into XLPE gel content increased and curing time decreased. Differential scanning calorimetric (DSC) analysis indicated the existence of two distinct melting endothermic peaks corresponding to two different crystalline phases. Results from mechanical properties showed that mechanical properties of XLPE/EVA blends improve by increasing EVA content up to 15 wt%.

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“…The polyethylene used was low density polyethylene (LDPE) with trade name of poliran-LF0200 (melt index = 1.6 g/10 min, d = 0.923 g/cm 3 …”

Section: Methodsmentioning

confidence: 99%

“…Crosslinking is then an obvious alternative and it is used today on large commercial scale in wire and cable and pipe industries [1][2][3][4]. In cable jacketing, however, in many occasions especially for low-voltage application (<10 kV) the mechanical and thermalendurance properties become more important than electrical properties.…”

Section: Introductionmentioning

confidence: 99%

Silane crosslinking of polyethylene: the effects of EVA, ATH and Sb2O3 on properties of the production in continuous grafting of LDPE

Azizi

Barzin²,

Morshedian³

2007

Express Polym. Lett.

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“…As a polymer material, the rheological property of LDPE melt is influenced significantly by its molecular weight and branch structure 34 . Therefore, the oscillatory shear rheological test could be used for further characterization of the similarity between PE1 and PE2.…”

Section: Resultsmentioning

confidence: 99%

“…As a polymer material, the rheological property of LDPE melt is influenced significantly by its molecular weight and branch structure. 34 Therefore, the oscillatory shear rheological test could be used for further characterization of the similarity between PE1 and PE2. The storage modulus G', loss modulus G 00 , complex viscosity [η*], and loss factor tanδ = G 00 /G' of PE1 and PE2 are shown in Figure 6.…”

Section: Chain Structurementioning

confidence: 99%

Comparative study on matrix resins in two low‐density polyethylene based cable insulation materials with different voltage grades

Huang,

Zhao,

Wei

et al. 2024

J of Applied Polymer Sci

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In industry, crosslinked polyethylene (XLPE) cable insulation is usually produced from crosslinkable compounds consisting of low‐density polyethylene (LDPE) and additives, which known as “cable materials”. Considering that in addition to additives, the structure of matrix resin is a key factor in determining the property of XLPE, it is worthy to study the structure requirements of matrix resin for the development of cable materials with different voltage grades. In this work, the structure of matrix resins of a high voltage grade and an extra high voltage grade cable material were comparatively investigated. Interestingly, it was found that the matrix resins have no significant difference in chain structure parameters including molecular weight and its distribution and vinyl content between two samples, and their crystalline structure as well as the melt rheology and melting crystallization behavior are also very similar. These results suggest that these matrix resins may not substantially differ. Our work shows that cable materials with different voltage grades are not necessarily diverge in terms of matrix resin structure, and it could be possible to develop higher grade cable materials using the same matrix resin as lower grade counterparts.

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“…The T 10 -time for the LDPE containing 2.0% dicumyl peroxide, but no antioxidant, is 37 minutes. Another type of LDPE having an increased amount of double bonds have been described 18,19) . For this polymer a substantially higher peroxide response has been measured, when compared to the polymer used in this work.…”

Section: Resultsmentioning

confidence: 99%