JP2001288319A - Vinyl chloride resin composition and its use - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a vinyl chloride resin composition capable of actualizing lightening and reduction in halogen by thinning without decreasing the abrasion resistance of a vinyl chloride resin in the case of forming the vinyl chloride resin composition into a tube or a sheet for wiring harness protection. SOLUTION: This vinyl chloride resin composition comprises 10-100 pts.wt. of an acetonitrile-butadiene rubber based on 100 pts.wt. of a vinyl chloride resin.

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 its use, and more particularly, to a vinyl chloride resin composition having improved abrasion resistance and suitable for covering electric wires 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.

[0004]

SUMMARY OF THE INVENTION According to the present invention, when molded into a wire harness protection tube or sheet, weight reduction and halogen reduction can be realized without reducing the abrasion resistance of the vinyl chloride resin. It is an object to provide a vinyl chloride resin composition.

[0005]

Means for Solving the Problems To solve the above-mentioned problems, a vinyl chloride resin composition containing 10 to 100 parts by weight of acrylonitrile-butadiene rubber (NBR) per 100 parts by weight of vinyl chloride resin, and this vinyl chloride resin Provided is a protective tube or sheet for a wire harness formed from the composition, particularly a wire harness for an automobile.

[0006]

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.

[0007] The NBR may also be a conventional NBR commercially available. The amount of NBR is 10 to 100 parts by weight, preferably 10 to 40 parts by weight, per 100 parts by weight of the vinyl chloride resin. If the amount of NBR is less than 10 parts by weight, the abrasion resistance cannot be sufficiently improved. On the other hand, if the amount of NBR exceeds 100 parts by weight, the resin composition becomes too soft.

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
Plasticizers such as diisononyl phthalate (DIN
P), phthalic acid-based plasticizers such as diisodecyl phthalate (DIDP), dioctyl phthalate (DOP), trimellitic acid-based plasticizers, polyester-based plasticizers, epoxy-based plasticizers, etc.), and fillers (eg, calcium carbonate, clay) And stabilizers for vinyl chloride resins (for example, lead-based, such as tribasic lead sulfate, tin-based, calcium-zinc-based, barium-zinc-based stabilizers).

[0009] The amount of these additives is 100 parts by weight of the total of the vinyl chloride resin and NBR, and
Parts by weight, preferably 0 to 45 parts by weight, 0 to 70 parts by weight of a filler, preferably 0 to 10 parts by weight, 0 to 30 parts by weight of a stabilizer, preferably 0 to 10 parts by weight. In addition to the above,
Antioxidants, antioxidants, copper damage inhibitors, light stabilizers, lubricants, flame retardants and the like can be added as appropriate.

The resin composition of the present invention can be molded in the same manner as a conventional vinyl chloride resin composition, and can be formed into a wire harness, particularly a protective tube or sheet for a wire harness for automobiles. The wall thickness of such a protective tube or the thickness of the sheet can be made thinner than that formed using a vinyl chloride resin composition not containing NBR, and even if the thickness is small, it has the same abrasion resistance. Therefore, when covering the same wire harness, the total weight and the amount of halogen (chlorine) of the tube or sheet can be reduced.

[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. Tape abrasion resistance: Wound around a metal round bar having a diameter of 10 mm so as to have an overlap width of 10 to 15 mm, and wrapped the sheet with a load of 45 against a 150-AA mesh wear tape.
Press with 0gf. The abrasion tape is run at a speed of 2.5 cm / sec along a circumference of a 17 mm diameter cylinder so as to form an angle of 30 ° with the pressed sheet, and the sheet is worn to expose a metal round bar. Measure the length of the wear tape up to. Note that the metal round bar around which the sheet is wound and the bar through which the wear tape runs are arranged so as to be orthogonal to each other. 150 cm or more passes. Scraping test: Using the blade shown in FIG. 1 (hardened steel), the blade is pressed against the sample with a load of 7.4 N as shown in FIG. 2 and reciprocated once a second at a temperature of 23 ° C. and an amplitude of 10 mm at a temperature of 23 ° C. The number of round trips until the sample is completely worn and disappears is recorded. 500 or more passes. Table 1 shows the results
Shown in

[0012]

[Table 1] Note: 1) Average polymerization degree 1300. 2) Made by JSR Corporation. 3) Diisononyl phthalate (DINP). 4) Calcium carbonate. 5) Ca-Zn-based vinyl chloride resin stabilizer (Rup110S manufactured by Asahi Denka Co., Ltd.). 6) Reduction rate of the sheet mass of each example having the same area with respect to the sheet mass of Comparative Example 1 (calculated assuming that the sheet has a tube shape with an outer diameter of 10 mm). 7) Percentage reduction in the amount of chlorine contained in the sheet of each example having the same area as the amount of chlorine contained in the sheet of Comparative Example 1 (calculated assuming that the sheet was formed into a tube having an outer diameter of 10 mm).

If the thickness of the vinyl chloride resin sheet is simply reduced by half as in Comparative Example 2, the abrasion resistance is significantly reduced. Moreover, even if the compounding amount of NBR is too small as in Comparative Example 3, the wear resistance cannot be sufficiently improved. On the other hand, as understood from the results of Examples 1 to 3, when NBR is blended at the ratio specified in the present invention, the wear resistance of the vinyl chloride resin composition is greatly improved and the weight of the product is reduced. And low halogenation can be achieved.

According to the present invention, NBR is added to vinyl chloride resin.
By adding, it is possible to greatly improve the abrasion resistance of the vinyl chloride resin composition while achieving weight reduction and halogen reduction. 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 scrape test.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H01B 17/58 H01B 17/58 FF Term (Reference) 4J002 AC07X BD04W FD020 FD20X GN00 GQ00 5G305 AA02 AB18 AB35 BA13 BA18 BA22 CA03 CA07 CA08 CA37 CA47 CA51 5G333 AA03 AA10 AB14 AB22 CB01 DA03 EA02 EB08

Claims (2)

[Claims] 1. A vinyl chloride resin composition comprising 10 to 100 parts by weight of an acrylonitrile-butadiene rubber per 100 parts by weight of a vinyl chloride resin. 2. A wire harness protecting tube or sheet formed from the vinyl chloride resin composition according to claim 1.