JP2000200515A - Pvc tape - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the generation of dioxin while lowering the quantity of chlorine included in the base material to 20 wt.% or less by composing the film base material of PVC resin at 100 pts.wt., plasticizer at 30-70 pts.wt., NBR at 2-30 pts.wt. weight, polyethylene chlorination at 5-40 pts.wt., and fire-resistant filler at 70-200 pts.wt. SOLUTION: Content percentage of chloride is restricted to 20 wt.% or less, and required mechanical strength and desirable breaking drawing are totally evaluated. As a plasticizer, DOP or the like is used, and included at 30-70 pts.wt., desirably at 40-60 pts.wt., in relation to the PVC(polyvinyl ethylene) at 100 pts.wt. NBR is included at 2-30 pts.wt., desirably at 5-15 pts.wt., in relation to the PVC resin at 100 pts.wt. Polyethylene chlorination is included at 5-40 pts.wt., desirably at 10-30 pts.wt., in relation to the PVC resin at 100 pts.wt. The fire-resistant filler such as antimony trioxide and/or aluminum hydroxide is included at 70-200 pts.wt., desirably at 100-10 pts.wt., in relation to the PVC resin at 100 pts.wt.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a PVC tape used as an electrical insulating material in electric wires of electric equipment and automobiles, and more particularly to a tape material in a film base material than a conventional flexible PVC (polyvinyl chloride) tape. The present invention relates to an environment-friendly PVC tape in which the amount of chlorine is significantly reduced.

[0002]

2. Description of the Related Art Conventionally, as a soft PVC tape for electrical insulation using a PVC resin composition as a base material, 25 to 60 parts by weight of a plasticizer and 100 parts by weight of a PVC resin as a base material composition, Additives (stabilizers, lubricants, coloring agents, fillers, etc.) in an amount of 2 to 30 parts by weight are generally used. Further, in order to be required for electrical insulation, a resistance value of 1 × 10 ¹² Ω · cm or more in volume specific resistance value is required.

[0003] The amount of chlorine contained in the base material of such a PVC tape is in the range of 30 to 45% by weight, usually 3 to 45% by weight.
Many are close to 5% by weight.

[0004]

However, in recent years, there has been a report that dioxin is generated when a chlorine-containing substance is burned. Some reports do not lead to generation depending on the combustion conditions, but there is a problem that generation may occur depending on the combustion conditions of the incinerator, and generation of hydrogen chloride may cause acid rain.

Accordingly, the present inventors have conducted intensive studies on the above-mentioned problems, and as a result, while having the physical properties (electrical insulation, flexibility, hand-cutting properties, flame retardancy, etc.) of conventional tapes, It has been found that the amount of chlorine in the substrate is reduced to 20% by weight or less to reduce the occurrence of the above-mentioned problems.

[0006]

That is, the present invention provides a P
In a PVC-based tape in which a film base mainly composed of VC (polyvinyl chloride) is formed in a tape shape, the film base is mixed with 100 parts by weight of a PVC resin, a plasticizer 30 to
70 parts by weight, 2-30 parts by weight of NBR (nitrile rubber),
5 to 40 parts by weight of chlorinated polyethylene, flame-retardant filler 70
This is a PVC tape in which the amount of chlorine in the entire PVC tape is reduced to 20% by weight or less.

In the present invention, the plasticizer is blended in order to impart flexibility to the film substrate. When the amount of the plasticizer is too large, the mechanical strength of the flame-retardant tape itself is reduced if the amount is too large, and the flexibility is lost if the amount is too small. Therefore, 30 to 70 parts by weight with respect to 100 parts by weight of the PVC resin. Parts (in terms of DOP), more preferably 40 to 60 parts by weight (in terms of DOP).

As the plasticizer, conventionally known plasticizers can be appropriately selected and employed, and DOP (di-2-ethylhexyl phthalate), DIDP (diisodecyl phthalate), epoxidized soybean oil, polyester plasticizer, trimellit Acid esters, phosphate esters, chlorinated paraffins and the like.

In the present invention, NBR (nitrile rubber) is compounded because NBR has good compatibility with PVC resin.
This is because the addition of a large amount of filler prevents the mechanical properties from being lowered and improves the oil resistance. If the compounding ratio of the NBR is too large, the tensile strength decreases, and if it is too small, the elongation at break decreases.
It is preferably 30 parts by weight, more preferably 5 to 15 parts by weight.

As the NBR, a conventionally known NBR can be appropriately selected and employed. The NBR has an amount of bound acrylonitrile of 15 to 55% by weight, and a small amount of acrylic acid or methacrylic acid in addition to butadiene and acrylonitrile. And the like.

In the present invention, the chlorinated polyethylene is blended to prevent a decrease in mechanical properties by adding a large amount of filler and to improve the flame retardancy, and that the chlorinated polyethylene is compatible with the PVC resin. It is for good. If the compounding ratio of the chlorinated polyethylene is too large, the tensile strength is reduced, and if it is too small, the elongation at break is reduced. Therefore, 5 to 40 parts by weight, more preferably 10 to 30 parts by weight, per 100 parts by weight of the PVC resin. Good by weight.

As the chlorinated polyethylene, a conventionally known chlorinated polyethylene can be appropriately adopted, and a non-crystalline type,
Any type such as crystal type can be adopted, and 30-40
Not only those having a chlorine content of 30% by weight but also those having a chlorine content of 30% by weight or less can be adopted.

In the present invention, the reason why the flame-retardant filler is blended is to improve the flame retardancy (self-extinguishing property) of the PVC tape itself and to reduce the amount of chlorine in the base material. . If the compounding ratio of the flame-retardant filler is too large, the elongation is reduced. If the compounding ratio is too small, the amount of chlorine in the base material is not reduced.
The amount is preferably 0 to 200 parts by weight, more preferably 100 to 1 part by weight.
50 parts by weight is good.

As the flame-retardant filler, conventionally known flame-retardant fillers can be appropriately selected. Chlorinated paraffin, chlorine-based flame retardant, reactive chlorine-based flame retardant, brominated flame-retardant, brominated epoxy resin Flame retardant, brominated epoxy / phenoxy resin flame retardant, bromine-based flame retardant, bromine-based reactive flame retardant, bromine-based polymer flame retardant, phosphate ester flame retardant, red phosphorus flame retardant, aluminum hydroxide Flame retardant, magnesium hydroxide flame retardant, antimony trioxide flame retardant, antimony tetroxide flame retardant, antimony pentoxide flame retardant, silicone flame retardant, boron flame retardant, tin flame retardant, zinc borate -Based flame retardants, tin / zinc-based flame retardants, ammonium polyphosphate-based flame retardants, polyphosphoramide-based flame retardants, zirconium-based flame retardants, nitrogen compound-based flame retardants, calcium / aluminate-based flame retardants, Ribuden of ammonium-based flame retardant, a guanidine based flame retardant, melamine-based flame retardant calcium carbonate-based flame retardant, there is carbonate Magunesuumu flame retardants.

The thickness of the film substrate is 50 to 400 μm.
m is appropriate.

In the PVC tape according to the present invention, an adhesive layer may be formed on one side or both sides of the above-mentioned film substrate. As the pressure-sensitive adhesive for forming the pressure-sensitive adhesive layer, a generally used pressure-sensitive adhesive can be appropriately used, and for example, a rubber-based pressure-sensitive adhesive, an acrylic pressure-sensitive adhesive, or the like can be used.

In the case of the solvent type or the emulsion type, the method of applying the pressure-sensitive adhesive to the film substrate is generally performed by applying a pressure-sensitive adhesive solution to one surface of the film substrate and drying. The thickness of the pressure-sensitive adhesive layer is suitably from 5 to 40 μm.

[0018]

EXAMPLES Examples of the present invention will be described below with reference to Table 1.
This will be described in more detail with reference to Comparative Examples.

[0019]

[Table 1]

In Table 1, the values of the raw materials in the column of formulation are all parts by weight, DOP (di-2-ethylhexyl phthalate) is used as a plasticizer, and antimony trioxide and / or Aluminum hydroxide was employed.
The “chlorine content” in the characteristic value is the chlorine content in the whole compounded material, and the chlorine content in the PVC resin is 5%.
6.8 wt%, chlorine content in chlorinated polyethylene is 3
It was calculated as 0.0% by weight. Example 1-1
Taking 9.6% by weight as an example, 59.8 parts by weight in the whole (305 parts by weight) (56.8 parts in 100 parts by weight of PVC resin)
%, 30% in 10 parts by weight of chlorinated polyethylene), and is calculated from (56.8 + 3) / 305. This value is desirably 20% by weight or less for the purpose of reduction.

In the table, the tensile strength was measured in accordance with JIS K 6732, and required 10 N / mm ² or more, and the elongation at break was measured in accordance with JIS K 6732. If the elongation at break is too low, the required elongation of the tape does not occur, and if the value is too high, the hand-cutting property deteriorates.
Less than 0% is preferred. In the above overall evaluation, the case where all the characteristic values were ○ was evaluated as ○, and the case where any of the characteristic values was marked with と し た was evaluated as ×.

Next, a first embodiment will be described. The base film used for the PVC tape in this example is P
DOP5 as a plasticizer per 100 parts by weight of VC resin
0 parts by weight, 10 parts by weight of chlorinated polyethylene, 15 parts by weight of NBR (nitrile rubber), 10 parts by weight of antimony trioxide, and 120 parts of aluminum hydroxide. Also contains a small amount of other stabilizers, lubricants and coloring agents. I do. This compounding agent was kneaded with a Banbury mixer and formed into a thickness of about 120 μm by calendering. The other examples and comparative examples described below were formed by the same method as the present example except for the mixing ratio.

When comparing Comparative Example 2, Example 1, and Comparative Example 3 (DOP compounding ratios 20, 50 and 80) in which the compounding ratio of DOP (plasticizer) of the film substrate was changed, the amount of DOP was If the amount is too small, the elongation at break becomes small, and the flexibility is poor.
When the amount of DOP was too large, the tensile strength was reduced.

Comparative Example 4, Example 1, 2, 3 and Comparative Example 5 in which the blending ratio of chlorinated polyethylene of the film substrate was changed (blending ratio of chlorinated polyethylene 0, 10, 20, 3)
When 0 and 50) were compared, when chlorinated polyethylene was not blended, the tensile strength and the elongation at break were small, and when the amount of chlorinated polyethylene was too large, the elongation was large and the hand-cutting property was poor.

Comparative Example 6, Examples 3, 2, 1 and Comparative Example 7 in which the blending ratio of NBR (nitrile rubber) of the film base was changed (NBR blending ratios 0, 5, 10, 15 and 40)
When NBR was not added, the elongation at break was small, and when the amount of NBR was too large, the elongation was large and the hand-cutting property was poor.

Comparative Examples 1, 8 and Examples 1, 2, 3, and Comparative Examples in which the compounding ratio of antimony trioxide (Sb ₂ O ₃ ) and aluminum hydroxide as the flame retardant filler for the film substrate was changed. 9 (mixing ratio of flame-retardant filler: 10, 60, 130,
Comparing 140, 150 and 260), when the amount of the flame-retardant filler is too small, the chlorine content exceeds 20% by weight and the chlorine amount does not decrease, and when the amount is too large, the elongation at break becomes small, resulting in flexibility. Sex was poor.

Although not shown in the table, each of the examples,
Each of the comparative examples had the same electrical insulation properties as those of the related art (1 × 10 ¹² Ω · cm or more in volume resistivity).

[0028]

Industrial Applicability The present invention relates to a PVC comprising a film substrate
In the system tape, the film base material is 100 parts by weight of a PVC resin, 30 to 70 parts by weight of a plasticizer, 2 to 30 parts by weight of NBR, 5 to 40 parts by weight of chlorinated polyethylene, and 70 to 200 parts by weight of a flame-retardant filler. This allows films for electrical equipment and automobiles to have the necessary electrical properties (electrical insulation, flexibility, hand-cutting properties, flame retardancy, etc.) for electrical insulation and binding. The chlorine content of the base material was significantly reduced (20% by weight or less), thereby reducing the generation of dioxin even when incinerated.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Tadashi Ogushi 2-13-1, Dai, Kamakura-shi, Kanagawa Prefecture Toyo Chemical Co., Ltd.

Claims (2)

[Claims] 1. A PVC-based tape in which a film base material mainly composed of PVC (polyvinyl chloride) is formed in a tape shape, wherein the film base material is blended with 100 parts by weight of a PVC resin and 30 to 70 parts by weight of a plasticizer. Part, NBR (nitrile rubber)
2 to 30 parts by weight, chlorinated polyethylene 5 to 40 parts by weight,
A PVC tape, comprising 70 to 200 parts by weight of a flame-retardant filler. 2. The PVC tape according to claim 1, wherein an adhesive layer is formed on one or both sides of the film substrate.