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Wire and cable insulation

A technology of insulating materials and wires, applied in insulators, rubber insulators, organic insulators, etc., can solve problems such as uneconomical wiring of wires

Inactive Publication Date: 2004-05-12
TYCO ELECTRONICS (UK) LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Additionally, it is essential for these uses that the wires withstand contact with all common types of insulating tape (adhesive and non-adhesive), sleeves, connectors, seals, and optionally cable jacketing materials, since mass production It is very uneconomical to use wiring that cannot use these components

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment A

[0011] By weight, the formulation included commercially available polypropylene (ethylene propylene copolymer) containing 5% metal sulphides, 6% of a combination of antioxidants including primary and secondary antioxidants, and 21% of halogen-containing antioxidants. Combustion agent combination, so the composition has a bromine content of about (not exceeding) 13%. The mixture can be mixed using conventional processing equipment such as twin screw mixers or internal mixing mixers. This mixture can then be extruded on a row of bare copper conductors with a thinner wall thickness, eg 0.2mm-0.3mm.

[0012] The samples were exposed to a row of PVC insulating tapes commonly used in common cable distribution applications, and aged at 150°C for 240 hours at an accelerated rate. When no zinc sulfide was added to the formulation, the samples (allowed to cool after leaving the heat aging environment) cracked when bent around a spool with a diameter approximately equal to four times th...

Embodiment B

[0016] The formulation included a polypropylene copolymer containing 20% ​​zinc oxide and 6% of the aforementioned combination of antioxidants, and 21% by weight of a halogen-containing flame retardant combination.

[0017] Samples in contact with PVC insulating tape showed similar improvement in PVC compatibility / heat aging performance as in Example A above after 240 hours of accelerated aging at 150°C. Although zinc oxide is significantly less effective than zinc sulfide, the performance of zinc oxide in contact with PVC casing at 125 °C is also improved, because the samples containing zinc oxide did not show cracks at the contact surface with PVC until after 3000 hours.

Embodiment C

[0019] Blends of polypropylene and EPR (ethylene propylene rubber) were tested at EPR contents between 10% and 30% and polypropylene contents between 40% and 70%. Similar blends of polypropylene and VAE (vinyl acetate / ethylene copolymer) were also tested. The results show similar performance improvements for formulations containing the above levels of zinc sulfide and / or zinc oxide.

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PUM

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Abstract

Wire or cable insulation comprising at least 30 %, preferably at least 40 %, of polypropylene homo- and / or co-polymer, and comprising at least 2 %, preferably at least 4 % zinc sulphide and / or at least 5 %, preferably at least 10 %, zinc oxide, percentages being by weight based on the whole insulation composition. Preferably, the insulation contains little or substantially zero hydrated flame-retardant fillers and substantially zero mercaptobenzimidazole, and a majority by weight or substantially all of any propylene copolymers present are copolymers of propylene with halogen-free co-monomers.

Description

technical field [0001] The present invention relates to the insulation of wires or cables, wherein the insulating material consists of a polymer part which is mainly polypropylene or a copolymer containing propylene, together with additional stabilizers, fillers and other additives, which endows the material with unexpected favorable performance balance. Background technique [0002] In the wire and cable industry, the aim has been to produce a viable high-performance insulating material based on polypropylene. For example, such a material would be particularly useful in automotive manufacturing, where polypropylene's inherent toughness, low cost and reusability are highly desirable properties. An additional strong driving force for this change is the desire to eliminate PVC for environmental reasons. Despite the increasing use of polypropylene in applications such as moulding, it has so far not been widely used as wire insulation in automobiles due to some decisive limita...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01GC08KC08K3/22C08K3/30C08LC08L23/08C08L23/10C08L23/16H01BH01B3/00H01B3/28H01B3/44
CPCH01B3/00C08K3/22C08L23/16C08L2203/202C08K3/30C08L23/0853C08K2003/2296H01B3/44C08K2003/3036C08L23/10C08L2666/04H01B3/30
Inventor G·H·罗维S·C·斯特德曼
Owner TYCO ELECTRONICS (UK) LTD
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