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Insulated wire and cable

A technology for insulated wires and insulated cables, which is applied in the direction of organic insulators, plastic/resin/wax insulators, etc. It can solve the problems of polyolefins, such as difficulty in producing dispersed phases, difficulties, oil resistance and reduced flame retardancy, etc., and achieves excellent oil resistance and flammability. The effect of flexibility or flame retardancy

Inactive Publication Date: 2008-12-03
HITACHI CABLE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] However, it is difficult to make the dispersed phase with poor miscibility fine when mixing polyolefins with different properties
[0012] For example, for the simple mixing type of ①, since the dispersed phase in the matrix phase is an extremely dispersed sea-island structure; in addition, for the dynamic cross-linking type of ②, although the aggregation of the dispersed phase is prevented by applying cross-linking, the dispersed phase The diameter of the polyolefin is made very small, but because the dispersed phase is too dispersed in the matrix phase, the properties of the polyolefin in the matrix phase become dominant and it is difficult to produce the characteristics of the dispersed phase
In addition, for the reaction mixing type of ③, since it is produced by a multi-stage polymerization method, compared with ① and ②, although the dispersed phase composed of amorphous polyolefin can be dispersed more finely in the matrix composed of, for example, crystalline polyolefin However, in the mixture of conventional reactive mixing thermoplastic elastomers, it is difficult to finely disperse the dispersed phase to achieve both the oil resistance of crystalline polyolefin and the flexibility of amorphous polyolefin. degree of full consideration
[0013] In addition, in the conventional halogen-free thermoplastic elastomers, since the reduction of oil resistance due to non-crosslinking and the reduction of flame retardancy due to non-halogenation are greatly affected, it is difficult to achieve both oil resistance and flame retardancy. aspect
Therefore, in order to obtain a thermoplastic elastomer excellent in both oil resistance and flame retardancy, although blending with a polymer excellent in oil resistance and combined use with a flame retardant has been carried out, sufficient oil resistance and flame retardancy have not yet been obtained. Flammable halogen-free thermoplastic elastomer

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0064] Hereinafter, examples will be described.

[0065] Figure 4 It is a graph showing the composition and characteristic evaluation test results of an insulator (resin composition) having excellent oil resistance and flexibility in an example of the first embodiment, Figure 5 It is a graph showing the composition and characteristic evaluation test results of an insulator (resin composition) in a comparative example of the first embodiment.

[0066] Figure 6 It is a graph showing the composition and characteristic evaluation test results of an insulator (resin composition) having excellent oil resistance and flame retardancy in an example of the second embodiment, Figure 7 It is a graph showing the composition and characteristic evaluation test results of an insulator (resin composition) in a comparative example of the second embodiment.

[0067] The samples used in the evaluation test are the Figure 4 and Figure 6 The resin composition of the composition shown in ...

no. 1 approach

[0081] Flame retardant (first embodiment: non-removable brominated flame retardant; second embodiment: magnesium hydroxide, average particle size: 1.0 μm)

[0082] Antioxidant (phenolic antiaging agent)

[0083] Lubricants (Fatty Acid Amides)

[0084] in addition, Figure 4-Figure 7 The evaluation method of is determined by the following method.

[0085] (1) Initial tensile strength and tensile elongation test

[0086] The tensile strength test was performed at a speed of 500 mm / min using a plate-shaped sample having a thickness of 2 mm according to JIS C-3005. The target value of initial tensile strength is 13 MPa or more, and the target value of tensile elongation is 300% or more.

[0087] Tensile elongation was calculated by the following formula (a).

[0088] (a) Tensile elongation (%) = (length of sample after tensile test - length of sample before tensile test) × 100 / length before tensile test

[0089] (2) Heat resistance test

[0090] The sample used in the above...

Embodiment 1-7

[0103] Such as Figure 4 As shown, 20 parts by weight of a flame retardant and 1 part by weight of an antioxidant were added to the composition of Examples 1-7 with respect to 100 parts by weight of the polyolefin-based polymer.

[0104] Examples 1-3 used only reaction-mixing thermoplastic resins containing 51-85 mol% of crystalline polypropylene in monomer units.

[0105] In Examples 4 and 5, two kinds of reaction mixing thermoplastic resins of 51-85 mole % crystalline polypropylene were used in terms of monomer units. For example, in Example 4, 50 parts by weight of reactive mixing type TPO-A and 50 parts by weight of reactive mixing type TPO-B were blended.

[0106] In Examples 6 and 7, a mixture of a reactive mixing thermoplastic resin of 51 to 85 mol % of crystalline polypropylene and other olefin-based polymers was used in terms of monomer units.

[0107] Comparative Examples 1-9 of the First Embodiment

[0108] Such as Figure 5 As shown, in the compositions of Comp...

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Abstract

A metallic conductor and an insulator provided at an outer periphery of the metallic conductor for coating the metallic conductor constitutes an insulated wire or cable. The insulator has a reactor blended type polyolefin-based thermoplastic resin containing 51-85 mol % per monomer unit of the crystalline polypropylene. In the insulator used in a non-halogen flame retardant wire or cable, 40 to 300 pbw of a metallic hydroxide is added to 100 pbw of a blended composition. In the blended composition, the reactor blended type polyolefin-based thermoplastic resin containing 51-85 mol % per monomer unit of the crystalline polypropylene is greater than 50 pbw and less than 100 pbw, and a polyolefin is greater than 0 pbw and not greater than 50 pbw.

Description

technical field [0001] The present invention relates to an insulated wire and an insulated cable, and more particularly relates to an insulated wire and an insulated cable having excellent oil resistance and flexibility (or flame retardancy). Background technique [0002] For electric wires and cables, oil resistance and flame retardancy (or flexibility) are required. Therefore, cross-linked chloroprene rubber is used as an insulator coated on wires and cables. Cross-linked chloroprene rubber has excellent oil resistance, especially mineral oil resistance, due to its composition containing highly polar chlorine. In addition, since the cross-linked chloroprene rubber releases chlorine during combustion and suppresses the combustion of the insulator, it is also excellent in flame retardancy. Therefore, cross-linked chloroprene rubber is used as oil-resistant and flame-retardant rubber. [0003] In recent years, due to increased environmental concerns, electric wires and cab...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B3/44
Inventor 福地胜一反町正美
Owner HITACHI CABLE