JP2010138375A - Resin composition and coated electric wire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a non-halogen (polypropylene) resin composition excellent in weather resistance, and a coated electric wire having a coating layer formed using the resin composition. <P>SOLUTION: The resin composition comprises: 100 pts.wt. olefin base resin comprising ≥30 and ≤70 pts.wt. polypropylene resin and the balance being an olefinic thermoplastic elastomer; a ≥67 and ≤120 pts.wt. inorganic flame retardant; a ≥1 and ≤10 pts.wt. hindered phenolic antioxidant; and a ≥5 and ≤10 pts.wt. zinc oxide. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a coated electric wire excellent in durability even when used outdoors, for example, in automobile applications, particularly in a high-humidity and high-temperature environment such as an automobile engine room, and the coating of such an electric wire. The present invention relates to a resin composition particularly suitable for forming a layer.

  JP-A-6-200089 (Patent Document 1) and JP-A-Hei 6 (1990) and JP-A-Hei 6 (1990) disclose a resin composition that does not generate harmful gases such as dioxin at the time of combustion and is optimal for use in an automobile or the like. No. 9-31267 (Patent Document 2) and the like.

  In these prior arts, a high temperature in the engine room is assumed, and there is also an excellent resin composition having high durability even in such a high temperature environment.

  However, considering the actual engine room environment, it is necessary to evaluate the durability in consideration of not only the high temperature but also all elements of the weather, that is, the total effects of heat, oxygen, ultraviolet rays, water (humidity), etc. However, in the above prior art, attention is not paid to properties other than high temperature, and when the resin composition according to the above prior art is actually studied, only an unsatisfactory result can be obtained regarding weather resistance. understood.

Japanese Patent Laid-Open No. 6-200089 JP-A-9-31267

  The present invention provides a non-halogen (polypropylene) resin composition that improves the above-described conventional problems, that is, excellent weather resistance, and a coated electric wire having a coating layer formed of such a resin composition. The purpose is to do.

  In order to solve the above problems, the resin composition of the present invention is an olefin base resin comprising a polypropylene resin in an amount of 30 parts by weight to 70 parts by weight and the remainder of the olefin thermoplastic elastomer as described in claim 1. 67 parts by weight or more and 120 parts by weight or less of inorganic flame retardant, 1 part by weight or more and 10 parts by weight or less of hindered phenolic antioxidant, and 5 parts by weight or more and 10 parts by weight of zinc oxide with respect to 100 parts by weight Hereinafter, it is a resin composition characterized by blending each.

  The covered electric wire of the present invention is a covered electric wire having a coating layer made of the resin composition according to claim 1 as described in claim 2.

  According to the resin composition of the present invention, it is excellent in flame retardancy, and no harmful gas such as dioxin is generated even by combustion. Further, since it is excellent in weather resistance and wear resistance, it is highly humid at high temperature. Since it has sufficient durability even in environments exposed to ultraviolet rays as well as the environment, it is not only used in the engine room of automobiles but also covered in automobile wires, a field where wear due to vibration is likely to occur. It can also be suitably used as a resin composition for forming a layer.

  Since the coated wire of the present invention has a coating layer composed of the resin composition according to the present invention as described above, it is also suitable as a coated wire used outdoors and an automotive wire used in an automobile engine room. Can be used.

  The resin composition of the present invention is 30 parts by weight or more and 70 parts by weight or less of polypropylene resin, and 100 parts by weight of olefin base resin consisting of the remainder of olefin thermoplastic elastomer and / or styrene thermoplastic elastomer. 67 to 120 parts by weight of inorganic flame retardant, 1 to 10 parts by weight of hindered phenolic antioxidant, and 5 to 10 parts by weight of zinc oxide, respectively. .

  Polypropylene resins used in the olefin base resin of the present invention include E-100GV (manufactured by Prime Polymer), E-150GK (manufactured by Prime Polymer), J-784HV (manufactured by Prime Polymer), Polybond 3200 ( Chemtura Japan), Umex 1001 (manufactured by Sanyo Chemical Industries), and the like.

  Moreover, as an olefin type thermoplastic elastomer, R110E (made by Prime Polymer Co., Ltd.) etc. are mentioned.

  The olefin base resin is prepared from the material as described above. At this time, the olefin thermoplastic elastomer is made so that the polypropylene resin is 30 parts by weight or more and 70 parts by weight or less and the total part by weight is 100 parts by weight. The remaining portion is sufficiently kneaded using a Banbury mixer, roll mill, kneader, twin screw extruder or the like.

  Here, when the blending amount of the polypropylene resin with respect to 100 parts by weight of the olefin base resin is less than 30 parts by weight, sufficient wear resistance against wear caused by vibrations when applied to a coating layer of an automobile electric wire. When the amount exceeds 70 parts by weight, sufficient flexibility satisfying the satisfactory routing required when applied to a coating layer of an automobile electric wire cannot be obtained.

  An inorganic flame retardant, a hindered phenol antioxidant, and zinc oxide are blended with such an olefin base resin to obtain a resin composition according to the present invention.

  Examples of the inorganic flame retardant include magnesium hydroxide, zinc borate, calcium hydroxide and the like.

  Examples of the hindered phenol antioxidant include Irganox 1010 (Ciba Specialty Chemicals).

  As zinc oxide (zinc white), those generally sold as two types of zinc oxide can be used as they are.

  With respect to 100 parts by weight of the olefin base resin as described above, the inorganic flame retardant is 67 to 120 parts by weight, the hindered phenol antioxidant is 1 to 5 parts by weight, and Zinc oxide is blended so as to be 5 parts by weight or more and 10 parts by weight or less, and kneaded sufficiently using, for example, a kneader or a twin screw extruder to obtain the resin composition of the present invention.

  When the blending amount of the inorganic flame retardant with respect to 100 parts by weight of the olefin base resin is less than 67 parts by weight, sufficient flame retardancy cannot be obtained, and when it exceeds 120 parts by weight, the coating layer of the electric wire for automobiles is used. Sufficient wear resistance cannot be obtained against wear caused by vibrations when applied.

  Further, if the blending amount of zinc oxide with respect to 100 parts by weight of the olefin base resin is less than 5 parts by weight, sufficient weather resistance cannot be obtained, and if it is added in excess of 10 parts by weight, foaming tends to occur. Productivity deteriorates.

  Here, in addition to the above essential components, calcium carbonate, polyamide and the like can be added to the resin composition of the present invention in an appropriate amount as long as the effects of the present invention are not impaired.

  Such a resin composition of the present invention is used as a molded product after being molded by an appropriate molding method such as extrusion molding and molding as an electric wire coating layer, depending on the field where high weather resistance is required.

The resin composition of the present invention will be described more specifically with reference to examples.
Table 1 shows materials used in Examples and Comparative Examples.

<Example 1>
70 parts by weight of the polypropylene resin (A agent) and 30 parts by weight of an olefin thermoplastic elastomer (B agent) were kneaded uniformly using a kneader to obtain an olefin base resin I.

  67 parts by weight of magnesium hydroxide (C agent), 2.5 parts by weight of hindered phenol antioxidant (D agent), and zinc oxide (G agent) with respect to 100 parts by weight of olefin base resin I Was blended to 5 parts by weight and uniformly kneaded using a kneader to obtain a resin composition (Example 1) according to the present invention.

<Examples 2 to 11 and Comparative Examples 1 to 9>
Similar to the resin composition according to Example 1, except that the raw materials and the blending amounts thereof are changed as shown in Tables 2 and 3, and the resin compositions 2 to 11 according to Examples and Comparative Examples are applied. Resin compositions 1 to 9 were obtained.

  About the said resin composition, the weather resistance, a flame retardance, abrasion resistance, and productivity were evaluated.

  A material test piece based on JIS K7262 No. 3 dumbbell (0.2 mm thickness) was prepared from each of the above resin compositions. 63 ± 3 ° C, rain time is set to 12 minutes per hour), and a tensile test (test speed: 200 mm / min, load: 100 N) of each test piece is performed every 20 hours. The change with time was examined.

  At this time, when the elongation was less than 100% at the test time of 60 hours, the weather resistance was insufficient, and “x”, the elongation was less than 100% after the test time of 60 hours to less than 140 hours. If the test time is 140 hours or more and less than 160 hours and the elongation is less than 100%, it is assumed that the elongation is less than 100%. If the test time is 160 hours, the elongation is 100. % Was evaluated as “◎” as sufficient. The results are also shown in Table 2 and Table 3.

  The 60-hour test period of the accelerated weathering test is sufficient for use as a coating layer for an actual automobile covered wire, not only in a high-temperature and high-humidity environment but also in an environment exposed to ultraviolet rays. It is judged that it corresponds to a condition having durability, and since it is considered that the elongation is required to be 100% or more in order to satisfy the weather resistance sufficiently at this stage, the elongation at the test time of 140 hours is less than 100%. In some cases, it was judged that the weather resistance was insufficient.

  Flame retardancy conforms to ISO6722, “○” indicates that the flame is extinguished within 70 seconds in a 15-second indirect flame, and “◯” indicates that the flame is not extinguished within 70 seconds. It was evaluated as “×” and listed in Table 2 and Table 3 together.

  Abrasion resistance is a manufacturing method that is particularly necessary when applied to automobile wires that are expected to wear due to vibration. This test is conducted in accordance with ISO 6722 and has a wear resistance of 300 or more scrapes. If it was sufficient, it was evaluated as “◯”, if it had a wear resistance of 250 or more and less than 300 times, “Δ”, and if it was less than 250 times, evaluated as “x”. These are also shown in Table 2 and Table 3.

  Regarding the productivity, when the kneader could not be kneaded in the preparation of the resin composition, “x” (we did not evaluate weather resistance, flame retardancy, and abrasion resistance at this time) and kneaded. The case was evaluated as “◯” and listed in Table 2 and Table 3.

  According to Tables 2 and 3, 67 parts by weight of the inorganic flame retardant with respect to 100 parts by weight of the olefin-based base resin composed of 30 parts by weight or more and 70 parts by weight or less of the polypropylene-based resin and the balance of the olefin-based thermoplastic elastomer. The resin composition according to the present invention comprising 120 parts by weight or less, 1 part by weight or more and 10 parts by weight or less of a hindered phenolic antioxidant, and 5 parts by weight or more and 10 parts by weight or less of zinc oxide. According to the report, no harmful gas such as dioxin is generated by combustion, and it is excellent in weather resistance, wear resistance, and productivity, so it is exposed to ultraviolet rays as well as high temperature and humidity. However, since it has sufficient durability, it is also suitably used as a resin composition for forming a coating layer of an automobile electric wire used in an engine room of an automobile. It can be seen that it is theft.

  Furthermore, using the resin compositions according to Examples 1 to 12 and Comparative Example 9 above, an automotive covered electric wire (based on JIS K6722) was actually produced and routed in the actual automobile engine room. When used as a wiring, it was confirmed that the electric wire having the resin composition according to Examples 1 to 12 as a coating layer was easy to route and further excellent in terms of durability, but was a comparative example. In the electric wire having the resin composition according to No. 9 as a coating layer, sufficient flexibility was not obtained and wiring was not possible.

Claims (2)

With respect to 100 parts by weight of the olefin-based base resin composed of 30 parts by weight or more and 70 parts by weight or less of the polypropylene-based resin and the remainder of the olefin-based thermoplastic elastomer,
67 to 120 parts by weight of inorganic flame retardant, 1 to 10 parts by weight of hindered phenolic antioxidant, and 5 to 10 parts by weight of zinc oxide, respectively. The resin composition characterized by the above-mentioned.   A coated electric wire having a coating layer comprising the resin composition according to claim 1.