JPH0129501B2 - - Google Patents

Description

[Detailed description of the invention]

[Technical Field] The present invention relates to a resin composition, and more specifically to an ethylene-vinyl acetate copolymer (hereinafter referred to as EVA).
Or it relates to a resin composition whose main component is an ethylene-ethyl acrylate copolymer (hereinafter referred to as EEA). [Prior art] Ethylene-based polymers or ethylene-ethyl acrylate copolymers (EEA) have excellent electrical insulation properties, and can be used for various crosslinking methods such as radiation crosslinking, organic peroxide crosslinking, and silane crosslinking using silane compounds. It has been widely used in various fields including electrical insulation materials because it has the advantage of being able to crosslink by appropriately employing it and improve various physical properties. However, recently the technological level in various fields has improved,
In various fields such as electrical equipment, vehicles, and automobiles, insulated wires, especially electronic wires, are required to have more advanced characteristics, such as oil resistance, processability during insulated wire manufacturing, and flame retardancy. , high-temperature dielectric strength (cut throgh property), etc. have become more demanding. [Objective and summary of the invention] The present inventor has been researching EVA or EEA compositions for a long time, and has particularly developed EVA or EEA compositions with particularly excellent physical properties in accordance with recent technological advances.
We have continued our research to develop EEA compositions. Particularly, in this research, it was discovered that an EVA or EEA resin composition having a specific composition as shown below can achieve the desired purpose, and the present invention has now been completed. That is, the present invention comprises 100 parts by weight of ethylene-vinyl acetate copolymer or (and) ethylene-ethyl acrylate copolymer, 5 to 120 parts by weight of linear polyethylene, 20 to 80 parts by weight of brominated flame retardant, and Sb ₂ O. _3. This relates to a resin composition containing 5 to 50 parts by weight. [Effects of the Invention] In the present invention, by adding and blending the three types of compounds mentioned above to EVA or (and) EEA, the resulting composition, among others, by crosslinking this composition, It has the advantage of being significantly superior in oil resistance, workability during wire manufacturing, flame retardancy, and high-temperature insulation strength. [Configuration of the Invention] The present invention provides 100 parts by weight of EVA or (and) EEA,
5 to 120 parts by weight of linear polyethylene, preferably 20
~80 parts by weight, 20 to 80 parts by weight of a brominated flame retardant, preferably 30 to 50 parts by weight, and 5 to 50 parts by weight _{of Sb2O3} , preferably 10 to 30 parts by weight. The EVA used in this case has a vinyl acetate content of 20% by weight or less, preferably 15% by weight or less, and its melt index also
A value of about 0.2 to 5 is preferable. EEA also has ethyl acrylate content of 20% by weight or less, MI of 0.2 to 1.0
is preferred. In addition, linear polyethylene has a low density, for example, a density of 0.92 to 0.93g/
A preferable example is one on the order of cm ³ .
Another preferable example is that the number of carbon atoms in the side chain is 4 to 8.
I can list some things. Any of the conventionally used brominated flame retardants can be used effectively, and specific examples include decabromodiphenyl oxide (for example, Planelon DB-100 from Mitsui Toatsu Fine Co., Ltd.), poly(tribromodiphenyl oxide), ) Styrene (Pyrocheck 68PB from Nissan Ferro Organic Chemical Co., Ltd.), ethylene glycol bis(pentabromophenyl) ether (Nissan Ferro Organic Chemical Co., Ltd.)
Co., Ltd.'s Pyrocheck 77B), screws (1, 2, 5,
An example may be 6-hexachlorodicyclopenteno)cyclooctane (Dechlorane Plus 25 from Hooker Chemicals and Plastic Co.). The composition of the present invention may further contain various other conventional additives, if necessary. Other additives in this case include, for example, other flame retardants, various anti-aging agents, inorganic fillers, etc., and crosslinking agents, crosslinking aids, etc. can also be used. EXAMPLES The present invention will be explained in more detail with reference to Examples below. However, in the following examples, "parts" means parts by weight. Examples 1 to 7 and Comparative Examples 1 to 2 Predetermined amounts of each component were mixed and sufficiently kneaded in the proportions shown in Table 1 to form compositions. An electric wire was produced from this composition according to a conventional method, and crosslinked by irradiation with an electron beam dose of 30 Mrad. Various physical properties were measured. The results are shown in Table 2. However, the physical properties were measured by the following methods. <Oil resistance> After being immersed in ASTM No. 2 oil at 100℃ for 96 hours, it is left at room temperature, and it is considered to pass if the residual tensile strength is 50% or more of the initial strength and the residual elongation is 65% or more. <Flame retardance> According to CU1581, after applying a certain amount of flame from a burner at a certain slope to a horizontal electric wire for 15 seconds.
Remove the flame for 15 seconds and repeat this 5 times. The test is passed if a certain amount of the wire does not burn abnormally or if ash does not drip and spread to the cotton placed underneath. <Workability> When the compound is coated on copper wire using a 30mmφ extruder, if the extruded surface appearance is smooth, the product is passed. Examples 8 to 12 and Comparative Examples 3 to 4 Predetermined amounts of each component were blended in the predetermined ratios shown in Tables 3 and 4 and thoroughly kneaded to form compositions. The physical properties of this composition were measured in the same manner as in Example 1. The results are shown in Table 5. Examples 13 to 15 and Comparative Examples 5 to 8 Each component shown in Table 6 was blended in a predetermined ratio and thoroughly kneaded to form a composition. Various dynamics were measured for each of these compositions. However, in this measurement, each of the above compositions was coated on a 0.5 mm ^two- strand copper body by high-speed extrusion at a wire speed of 200 m/min to a thickness of 0.2 mm, and cross-linked by irradiation with an electron beam of 30 Mrad. We used electric wire manufactured by In addition, the workability was measured using the above-mentioned method of measuring workability. When each composition was coated on a 0.5 mm ^two- stranded wire steel body by high-speed extrusion at a wire speed of 200 m/min at a thickness of 0.2 mm, the extrusion appearance was observed with the naked eye. This is what I did.

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Claims (1)

[Claims] 1. Ethylene-vinyl acetate copolymer or (and)
A resin composition comprising 100 parts by weight of an ethylene-ethyl acrylate copolymer, 5 to 120 parts by weight of linear polyethylene, 20 to 80 parts by weight of a brominated flame retardant, and 5 to 50 parts by weight of Sb ₂ O ₃ .