JP2001106988A - Tape - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the generation of dioxin in the combustion of a polyvinyl chloride tape for binding electric wires of automobile by decreasing the chlorine content of the tape. SOLUTION: The chlorine content of the polyvinyl chloride tape is adjusted to 7-12 wt.% by setting the composition of the film base of the tape to 100 pts.wt. of a polyvinyl chloride resin, 50-300 pts.wt. of a polyolefin resin, 60-350 pts.wt. of a filler, 5-50 pts.wt. of a chlorinated polyethylene, 10-80 pts.wt. of a nitrile rubber, 10-80 pts.wt. of antimony oxide and 30-70 pts.wt. of a plasticizer.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polyvinyl chloride resin tape used as an electrical insulating material for electric cables used in electric equipment and automobiles, and more particularly to a tape having a high degree of flame retardancy. It relates to a tape whose chlorine content is greatly reduced.

[0002]

2. Description of the Related Art Conventionally, a polyvinyl chloride resin tape has a plasticizer 2 per 100 parts by weight of polyvinyl chloride resin.
A mixture of 5 to 60 parts by weight and 2 to 30 parts by weight of other compounding agents (stabilizer, lubricant, coloring agent, etc.) is used. Further, in order to use it for electrical insulation, a resistance value of 1 × 10 ¹² Ω · cm or more in volume specific resistance value is required. Furthermore, tapes for binding automobile wires are required to have a high degree of flame retardancy.

[0003] The chlorine content of such tapes is 30-4.
It is in the range of 5% by weight, and is usually close to 35% by weight.

[0004]

Although such tapes do not affect the human body at all in normal use or landfill disposal, they contain chlorine, so if they are to be incinerated, depending on the combustion conditions, dioxin or chloride may not be present. There is a report that hydrogen is generated, which is harmful to humans and the environment.

Here, the generation of these substances can be suppressed by reducing the amount of chlorine contained in the tape. However, if the chlorine content is reduced unnecessarily, the mechanical properties such as the tensile strength and the elongation at break of the tape are reduced, and a new problem occurs that the tape cannot be put to practical use.

Accordingly, it is an object of the present invention to reduce the amount of chlorine contained in the tape while maintaining the mechanical properties and high flame retardancy.

[0007]

Means for Solving the Problems The present inventor has made intensive studies in view of the above, and as a result, the composition of the film base material of the tape was changed to 100 parts by weight of polyvinyl chloride resin,
300 parts by weight, filler 60-350 parts by weight, chlorinated polyethylene resin 5-50 parts by weight, nitrile rubber 10-80
Parts by weight, 10 to 80 parts by weight of antimony oxide, 30 plasticizers
To 70 parts by weight to maintain the mechanical properties and high flame retardancy of the tape and to reduce the chlorine content to 7 to 12% by weight.
The present inventors have found that the above-mentioned problems can be solved by adjusting the distance to the above, and completed the present invention.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, the polyolefin resin blended in the film base of the tape has the effect of reducing the relative amount of chlorine contained while maintaining the flexibility of the tape. If the amount of the polyolefin resin is too large, the tensile strength of the tape will be reduced if it is too large, and if the amount is too small, the relative amount of chlorine in the tape will not be reduced. The amount is preferably 50 to 300 parts by weight, preferably 150 to 2 parts by weight.
50 parts by weight is good.

As the polyolefin resin, conventionally known polyolefin resins can be appropriately selected and employed, and high-density polyethylene, medium-density polyethylene, low-density polyethylene, high-pressure low-density polyethylene, linear low-density polyethylene, ethylene-propylene Copolymer rubber, ethylene-
Olefin rubbers such as propylene-diene copolymer rubber and ethylene-butene copolymer rubber, ethylene-vinyl ester copolymers such as ethylene-vinyl acetate copolymer, ethylene-ethyl-acrylate copolymer, ethylene- ( Ethylene-based (co) polymers such as copolymers with ethylene-α, β-carboxylic acid or derivatives thereof such as alkyl (meth) acrylate copolymers and polypropylene-based copolymers such as polypropylene and propylene-ethylene copolymers There are polymers, polybutene-based copolymers and the like.

In the present invention, the filler compounded in the film base of the tape has an effect of reducing the relative amount of chlorine contained in the tape. The compounding ratio of the filler is
If the amount is too large, the elongation at break of the tape decreases, and if the amount is too small, the relative amount of chlorine contained in the tape is not reduced. More preferably 140 ~
270 parts by weight is good.

As the filler, conventionally known fillers can be appropriately selected and employed. Calcium carbonate-based filler, magnesium carbonate-based filler, barium sulfate-based filler, calcium sulfate-based filler, magnesium oxide-based filler , Aluminum hydroxide-based filler, magnesium hydroxide-based filler, calcium silicate-based filler, calcium metasilicate-based filler, silicon dioxide-based filler, hydrous aluminum silicate-based filler, hydrous magnesium silicate-based There are fillers and the like.

In the present invention, the chlorinated polyethylene compounded in the film base of the tape prevents a decrease in elongation at break of the tape due to addition of a large amount of a filler.
It becomes a compatibilizer between the polyvinyl chloride resin and the polyolefin resin. If the compounding ratio of the chlorinated polyethylene is too large, the tensile strength of the tape decreases, and if it is too small, the effect of preventing a decrease in the elongation at break of the tape cannot be obtained. 5 to part
The amount is preferably 50 parts by weight, more preferably 15 to 40 parts by weight.

As the chlorinated polyethylene, a conventionally known chlorinated polyethylene can be appropriately selected and employed.

In the present invention, the nitrile rubber compounded in the film base of the tape has an effect of preventing the elongation at break of the tape from being lowered by the addition of a large amount of filler and improving the oil resistance. . If the compounding ratio of the nitrile rubber is too large, the tensile strength of the tape decreases, and if the compounding ratio is too small, the effect of preventing a decrease in the elongation at break of the tape cannot be obtained.
10 to 80 parts by weight, more preferably 30 to 60 parts by weight, per 100 parts by weight.

As the nitrile rubber, a conventionally known nitrile rubber can be appropriately selected and employed. When the amount of bound acrylonitrile in the nitrile rubber is 15 to 55%, butadiene and acrylonitrile, a small amount of acrylic acid or methacrylic acid And the like.

In the present invention, antimony oxide blended in the film base of the tape has an effect of improving the flame retardancy of the tape. If the compounding ratio of the antimony oxide is too large, the elongation at break of the tape decreases,
If the amount is too small, the effect of improving the flame retardancy cannot be obtained.
The amount is preferably 0 to 80 parts by weight, more preferably 30 to 60 parts by weight.

As the antimony oxide, conventionally known antimony oxide can be appropriately selected and employed, and may be a single substance or a mixture of antimony trioxide, antimony pentoxide, antimony pentoxide, or a composition containing these.

In the present invention, the plasticizer incorporated into the film base of the tape has an effect of giving the tape flexibility. If the amount of the plasticizer is too large, the tensile strength of the tape is reduced. If the amount is too small, the flexibility of the tape cannot be obtained. Parts by weight, more preferably 40 to 60 parts by weight.

As the plasticizer, a conventionally known plasticizer can be appropriately selected and employed, and di-2-ethylhexyl phthalate, diisodecyl phthalate, epoxidized soybean oil, adipic acid-based polyester, trimellitic acid ester, phosphate ester , Tricresyl phosphate, chlorinated paraffin and the like.

The tape according to the present invention may have an adhesive layer on one or both sides of the tape. As the pressure-sensitive adhesive for forming the pressure-sensitive adhesive layer, generally used rubber-based pressure-sensitive adhesives, acrylic pressure-sensitive adhesives, and the like can be appropriately selected and employed.

[0021]

EXAMPLES Example 1 according to the present invention will be described with reference to Table 1 and in comparison with Comparative Examples.

[0022]

[Table 1]

The film base material for the tape in Example 1 was prepared by adding the materials shown in Table 1 to 100 parts by weight of polyvinyl chloride resin in the amounts shown in Table 1, and adding a small amount of other additives (stable Agents, lubricants, coloring agents, etc.). In Example 1, low-density polyethylene was used as a polyolefin resin, aluminum hydroxide as a filler, antimony trioxide as antimony oxide, and di-2-ethylhexyl phthalate as a plasticizer.

The tape in Example 1 was prepared by kneading a compounding material obtained by mixing the film base material with a Banbury mixer.
It was obtained by forming a film having a thickness of about 120 μm by calendering into a tape shape.

Table 1 shows the evaluation method of the tape of Example 1.
As shown in Table 2, the chlorine content, tensile strength, breaking strength, and flame retardancy were measured and determined.

The chlorine content is a value calculated by assuming that the chlorine content in the polyvinyl chloride resin is 56.8% by weight and the chlorine content in the chlorinated polyethylene is 30.0% by weight. The amount is 7 to 12% by weight in order to reduce the chlorine content of the tape while maintaining the mechanical properties.
Was passed.

The tensile strength and elongation at break are measured according to JIS.
It was measured according to K 6732. The tensile strength is 10 N, which is necessary for practical use of the tape.
/ Mm ² or more is acceptable, and the elongation at break is 150% to 350% in order to maintain the mechanical properties of the tape.
Was passed.

Further, the flame retardancy is 120 μm in thickness and 2 in width.
Oxygen concentration (oxygen index) when the upper end of the flag-shaped sample adjusted to 0 mm and 150 mm in length was ignited and extinguished within 5 seconds after removing the ignition source, measured with a measuring device of JIS K 7201 Value. Regarding the flame retardancy, a measured value of 24 or more was regarded as a pass.

In Example 1, the target characteristic values were obtained in all the evaluation items, and the chlorine content in the tape was reduced while maintaining the mechanical properties and high flame retardancy of the tape. We were able to.

Other examples and comparative examples described below are the same as the present example unless otherwise specified.

In Examples 2 and 3, the amount of antimony trioxide in the film substrate in Example 1 was changed to 50 parts by weight and 60 parts by weight, respectively. Example 2
Also in Example 3, target values were obtained for all evaluation items.

In Comparative Example 1 in which the content of the polyolefin resin in the film substrate was 30 parts by weight, it was confirmed that the chlorine content could not be reduced to the target value. Comparative Example 2 in which the blending amount of the polyolefin resin was 350 parts by weight
Did not obtain the target values in tensile strength, elongation at break and flame retardancy of the tape.

In Comparative Example 3 in which the amount of the filler in the film substrate was 50 parts by weight, it was confirmed that the target values of chlorine content and flame retardancy could not be obtained. In Comparative Example 4 in which the blending amount of the filler was 400 parts by weight, the tape was embrittled and the target tensile strength and breaking elongation could not be obtained.

In Comparative Example 5 in which the amount of chlorinated polyethylene in the film substrate was 3 parts by weight, the target values of the tensile strength, elongation at break and flame retardancy of the tape could not be obtained.
Further, in Comparative Example 6 in which the blending amount of the chlorinated polyethylene was 70 parts by weight, the tape became too flexible, and the target tensile strength and breaking elongation could not be obtained.

In Comparative Example 7 in which the compounding amount of the nitrile rubber in the film substrate was 5 parts by weight, the tape was embrittled and the desired tensile strength and elongation at break could not be obtained. Further, in Comparative Example 8 in which the compounding amount of the nitrile rubber was 100 parts by weight, the target values in the tensile strength and the flame retardancy of the tape could not be obtained.

In Comparative Example 9 in which the amount of antimony trioxide in the film substrate was 5 parts by weight, the target value of the flame retardancy of the tape could not be obtained. In Comparative Example 10 in which the compounding amount of the antimony oxide was 100 parts by weight, the tape was embrittled and the target tensile strength and elongation at break could not be obtained.

In Comparative Example 11 in which the blending amount of the plasticizer in the film substrate was 20 parts by weight, the tape was embrittled and the target elongation at break could not be obtained. Further, in Comparative Example 12 in which the blending amount of the plasticizer was 80 parts by weight, the tape became too flexible, so that the target tensile strength, elongation at break, and flame retardancy could not be obtained.

Although not shown in Table 1, each of the Examples and Comparative Examples had the same electrical insulation properties as those of the related art (1 × 10 ¹² Ω · cm or more in terms of volume resistivity). .

[0039]

According to the present invention, the composition of the tape film substrate is 100 parts by weight of polyvinyl chloride resin, 50 to 300 parts by weight of polyolefin resin, 60 to 350 parts by weight of filler, 5 to 50 parts by weight of chlorinated polyethylene resin. Parts, 10 to 80 parts by weight of nitrile rubber, 10 to 80 parts by weight of antimony oxide, and 30 to 70 parts by weight of a plasticizer, while maintaining the mechanical properties, electrical insulation and high flame retardancy of the tape. The chlorine content of the tape could be adjusted to 7 to 12% by weight, so that even if the tape was incinerated, the effect on the human body could be reduced.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Tadashi Ogushi 2-13-1, Dai, Kamakura-shi, Kanagawa F-term in Toyo Kagaku Co., Ltd. (Reference) 4J004 AA05 AA10 CA03 CA04 CA05 CA07 CB03 FA05

Claims (1)

[Claims] 1. A tape in which a film base is formed in a tape shape, wherein the film base is a polyvinyl chloride resin
00 parts by weight, polyolefin resin 50 to 300 parts by weight, filler 60 to 350 parts by weight, chlorinated polyethylene 5
A tape containing 10 to 80 parts by weight of nitrile rubber, 10 to 80 parts by weight of antimony oxide, and 30 to 70 parts by weight of a plasticizer.