JP2001172460A - Vinyl chloride-based resin composition and its use - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a vinyl chloride resin composition having improved abrasion resistance without damaging other characteristics, e.g. flexibility and mechanical strength, of the vinyl chloride resin composition consisting essentially of the vinyl chloride resin. SOLUTION: This vinyl chloride resin composition consists essentially of the vinyl chloride resin, and contains a polyamide, especially nylon 12 in an amount of 15-25 pts.wt. based on 100 pts.wt. of the whole resin components.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vinyl chloride resin composition and a coated electric wire, and more particularly, to a vinyl chloride resin composition suitable for coating an electric wire having improved abrasion resistance and a resin composition formed from the resin composition. And a wire harness protection tube or sheet.

[0002]

2. Description of the Related Art Vinyl chloride resin has been used as a covering material for electric wires including single wires and stranded wires for many years.
In order to impart various properties as a wire covering material, for example, abrasion resistance, flexibility, low temperature resistance (cold resistance), etc., various additives such as plasticizers, stabilizers, fillers, etc. A lubricant and the like are blended.

By the way, in order to cope with the recent tendency to reduce the weight of automobiles, home electric appliances, etc., it is desired to reduce the weight of the coating of the electric wires used for them, and the reduction of halogen is promoted in consideration of environmental measures. However, if the thickness of the vinyl chloride resin coating is reduced for weight reduction and halogen reduction, the required level of abrasion resistance will not be obtained, and it will not be able to function as a protective exterior for electric wires and wire harnesses. Problems arise. In general, in order to improve the wear resistance of a coating material containing a vinyl chloride resin, particularly a soft vinyl chloride resin as a main component, it is known that the amount of a plasticizer is reduced and the resin composition is changed from soft to semi-hard. Have been. However, in order to dramatically improve the level of abrasion resistance, it is necessary to approach the composition of the hard vinyl chloride resin. However, if the amount of the plasticizer is excessively reduced, the coating loses flexibility and becomes hard to expand. Also, impact resistance (including low-temperature brittleness) decreases. Therefore, there is a limit in improving the wear resistance of the vinyl chloride resin wire covering material by reducing the amount of the plasticizer added.

On the other hand, polypropylene resin or hydrogenated SB
It has also been proposed to blend R with a vinyl chloride resin to improve the abrasion resistance, but there is a problem that the heat resistance of the entire resin composition is reduced.

[0005]

SUMMARY OF THE INVENTION The present invention relates to a vinyl chloride resin composition containing a vinyl chloride resin as a main component.
For example, an object of the present invention is to provide a vinyl chloride resin composition having improved wear resistance without impairing flexibility and mechanical strength.

[0006]

Means for Solving the Problems To solve the above problems, a resin composition containing a vinyl chloride resin as a main component, characterized by containing a polyamide, and a vinyl chloride resin composition comprising the same Provided is a protective tube or sheet for a wire harness formed from a resin composition, particularly a wire harness for an automobile.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The vinyl chloride resin may be a vinyl chloride resin used for a conventional wire covering material, and a vinyl chloride resin called soft vinyl chloride is particularly preferable. In the present invention, the wire harness is a conventional wire harness, particularly an automobile wire harness. .

As the polyamide, nylon 11, nylon 12, or a mixture thereof is used. These are preferable because they are excellent in wear resistance and heat resistance. In addition, since the melting point of nylon 12 is 175 ° C., it melts sufficiently at the kneading temperature of the vinyl chloride resin and is well dispersed. Commercially available products include "Daiamide ZL1101" (Daicel Huls Co., Ltd.), Rilsan BESN OF15TL and Rilsan AECNOTL (both manufactured by Toray Industries, Inc.), and Grilamide TR-55 (manufactured by Mitsubishi Chemical Corporation).

The compounding amount of the polyamide is as follows.
It is 15 to 25 parts by weight per 00 parts by weight. If the amount of the polyamide is less than 10 parts by weight, the abrasion resistance cannot be sufficiently improved. On the other hand, if the amount of the polyamide exceeds 25 parts by weight, the abrasion resistance is further improved, but the flexibility of the entire composition may be impaired.

The vinyl chloride resin composition of the present invention may contain various additives conventionally used in vinyl chloride resin compositions, particularly in vinyl chloride resin compositions for wire harness protective coating. The main examples of compounding agents are
Plasticizer (for example, phthalic acid, trimellitic acid, polyester, epoxy plasticizer, etc.), filler (for example, calcium carbonate, clay, etc.), stabilizer for vinyl chloride resin (for example, tribasic lead sulfate) Lead-based, tin-based, calcium-zinc-based, barium-zinc-based stabilizers, etc.). In addition to the above, an antioxidant, an antioxidant, a copper damage inhibitor, a light stabilizer, a lubricant, A fuel and the like can be appropriately added.

[0011]

The present invention will be described more specifically below with reference to examples. Examples 1 to 3 and Comparative Examples 1 to 3 The components shown in Table 1 were blended, a sheet having a thickness shown in Table 1 was formed from each composition, and the abrasion resistance of the sheet was measured by the following method. did. Scraping test: Using the blade (hardened steel) shown in FIG. 1, the blade is pressed against the sample with a load of 7.4 N as shown in FIG. The number of round trips until the sample is completely worn and disappears is recorded. Table 1 shows the results.

[0012]

[Table 1] Note: 1) Average polymerization degree 1300. 2) Daiamide ZL1101 (manufactured by Daicel Huls Co., Ltd.). 3) dinonyl phthalate (DINP). 4) Calcium carbonate. 5) Rup110S (manufactured by Asahi Denka Co., Ltd.).

By adding a polyamide to the vinyl chloride resin, the wear resistance of the vinyl chloride resin composition can be remarkably improved. Therefore, it is possible to cope with the reduction in diameter, weight, and halogen content of electric wires and wire harnesses.
The chlorine content per unit weight of the coating composition can be reduced.

[Brief description of the drawings]

FIG. 1 is a schematic view of a blade used in a scrape test.

FIG. 2 is a diagram showing an arrangement of a blade and a sample in a scrap test.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat ゛ (Reference) H01B 7/00 301 H01B 7/00 301 7/18 17/56 A 17/56 17/58 F 17/58 7/18 BF term (reference) 4J002 BD031 BD041 CL012 GQ01 5G305 AA02 AB18 BA13 CA03 CA20 CA37 5G309 AA09 5G313 AB03 AC02 AD03 AE03 AE05 5G333 AA09 AA13 AB14 AB22 CB01 DA03

Claims (4)

[Claims] 1. A vinyl chloride resin composition comprising a vinyl chloride resin as a main component and comprising at least one polyamide selected from nylon 11 and nylon 12. 2. The vinyl chloride resin composition according to claim 1, wherein the polyamide is nylon 12. 3. The vinyl chloride resin composition according to claim 1, which contains 15 to 25 parts by weight of a polyamide based on 100 parts by weight of all resin components. 4. A wire harness protecting tube or sheet formed from the vinyl chloride resin composition according to claim 1.