JPS61133508A - Insulated wire - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an insulated wire, particularly an insulated wire having an irradiation-crosslinked semi-rigid vinyl chloride coating layer with excellent damage resistance.

[Background of the Invention 1 Cross-linked vinyl chloride-coated wires can meet various performance requirements, have well-balanced characteristics, and are flame retardant and economical. Its use is expanding.

Cross-linked PVC-coated wires are used in advanced electronic equipment such as computers and communications equipment, and aircraft.

It is also used in automobiles and many other fields.

This field focuses on miniaturization, weight reduction, high performance, and reliability f1. There is a constant trend toward improving safety and saving labor, and cross-linked vinyl chloride covered M electric wires have successfully responded to this trend, which is why they have achieved remarkable growth.

Wiring inside various electronic devices, aircraft, automobiles,
In addition, recently several wires to several hundred or even several thousand wires are sometimes formed into a harness and bundled together depending on the intended wiring.

[Problems to be Solved by the Invention] Naturally, these insulated wires are required to have damage resistance that can withstand severe wiring work and repair work.

In recent years, these electric wires have become thinner and thinner, and when one or several wires are pulled out from a harnessed wire for wiring or repair, the insulation may be damaged if the friction between the wires is large. In some cases, there were many accidents that resulted in conductor breakage.

The present invention has been made based on the above, and has significantly reduced the frictional force without impairing the characteristics of cross-linked vinyl chloride insulated wires, thereby preventing conductor breakage even when one or several wires are pulled out from a bundled wire. Of course, the present invention provides a new insulated wire that can significantly reduce insulation damage and has excellent mechanical strength.

[Means for Solving the Problems] The insulated wire of the present invention contains not more than 50 and a half parts of a plasticizer, at least 5 parts of a polyfunctional monomer, and at least 5 parts of a fatty acid monoamide, based on 100 parts by weight of a polyvinyl chloride resin. It is characterized in that it is coated with a resin composition containing 0.2 parts by weight, and that this coating is crosslinked by radiation irradiation.

In the present invention, it is preferable to use a homopolymer as the polyvinyl chloride resin, but if it is mainly composed of polyvinyl chloride, ethylene is used.

j (with propylene, vinylidene chloride, vinyl acetate, etc.)
Polymers, graft copolymers of ethylene-vinyl acetate, chlorinated polyethylene, etc., blends of ethylene-vinyl acetate, nitrile rubber, chlorinated polyethylene, acrylonitrile-butadiene-styrene, and the like.

As a plasticizer, di-n-octyl phthalate.

7-talic acid esters such as di-2-I cyphthalate, diisodecyl phthalate, ditridecyl phthalate,
Dioctyl adipate, dioctyl mazeley 1-. Fatty acid esters such as dioctyl sebacate, glue/mv acid esters such as tricresyl phosphate and trioctyl phosphate, epoxidized substances such as epoxidized soybean oil and epoxy resins, polynisdelic acids such as adipic acid and sebastic acid,
Various plasticizers such as 1-limellitic acid esters such as trioctyl trimellitate and tri-n-J cutyl trimellitate are used alone or in combination.

The amount of plasticizer used was limited to 50 parts by weight or less because emphasis was placed on mechanical properties; if the amount is less than this, mechanical properties deteriorate and sufficient damage resistance cannot be obtained. There is no particular limitation as long as it is 50 parts by weight or less, but preferably 20 parts by weight or less.
~50 parts by weight.

Examples of polyfunctional monomers include divinylbenzene, nitylene glycyldimethacrylate, and triallylisocyanurate.
to 1, 1~rimethylolpropane trimethacrylate 1~
．． Examples include diallyl fumarate, triallyl trimellitate, trimethacryl 1-herrimellitate, pentaerythritol tetramethacrylate, and the like.

The reason why the amount of polyfunctional monomer used was limited to 5 parts by weight or more was because
If this is not achieved, a sufficient crosslinking density cannot be obtained even when irradiated with radiation, which may cause problems in, for example, heat-deformed bamboo, cut-through properties, soldering iron meltability, solder shrinkage resistance, etc.

'' The two limits are not particularly limited, but if the number is too large, the workability of the product will be poor or the product will become rigid, so it is preferably 5 to 30 parts.

Examples of the fatty acid monoamides mentioned in the present invention include erucylamide and oleylamide, and it has been recognized that these can significantly reduce frictional resistance without substantially impairing the various excellent properties of polyvinyl chloride. Ta.

This is different from the lubrication effect that is generally known, as it oozes out onto the surface of the vinyl chloride coating and forms a thin film to provide a lubricating effect. Moreover, it has low volatility, as seen from the molecules of fatty acid monoamide, and can maintain this performance for a long period of time.

The amount of fatty acid monoamide added was set at 0.2 weight parts because
This is based on experimental results showing that if the amount is less than 0.2 parts by weight, there is almost no effect of lowering the frictional resistance, and from 0.2 parts by weight, a remarkable lubricity effect is exhibited and the frictional force is reduced.

The upper limit is determined based on the composition of the semi-rigid vinyl chloride, crosstalk and extrusion processability of this composition.

That is, fatty acid monoamides have an extremely strong oxidative effect, and addition of a large amount significantly reduces kneading and extrusion processability, so this point must be taken into consideration when making a decision.

In the present invention, in addition to the above-mentioned components, various stabilizers such as lead salts and organotin stabilizers, various metal soaps such as stearic acid metal salts, various antioxidants such as phenolic antioxidants,
Various flame retardants such as halogens and phosphorus compounds, feed combustion aids such as antimony trioxide and zinc borate, fillers such as clay, calcium carbonate, and aluminum hydroxide, colorants, and ultraviolet absorbers.

It is possible to add various compounding agents used in conventional vinyl chloride compositions.

[Example] Various properties of molded articles made from compositions based on the formulations shown in Table 1 were measured.

The results are shown in the lower column of Table 1.

The characteristics were measured as follows.

(1) Tensile strength, elongation, 100% modulus 20-
It is molded to a thickness of 1m/m using a mold and press, and then an electron beam is applied to it to a thickness of 5M.
Punch out the rad irradiated sheet with a dumbbell according to JIS
Tested based on K 6723.

(2) Static friction system, kinetic friction system Nibles molding 1 mtt + × 30#X 100t irradiated with 5 Mrad radiation beam
Layer two sheets of rm and heat at 20℃ as shown in Figure 1.
Expression (1
) and (2).

In FIG. 1, 1 is a rail, 2 is a sliding block, 31.32 is a trial sheet, 4 is a load, 5 is a motor, 6 is a load cell, and 7 is a record of a chart, etc.

(3) Damage resistance: A wire with an outer diameter of 1.1# coated with a conductor diameter of 0.5# and a thickness of 0.3 m was irradiated with an electron beam at 7 Mrad, and the damage resistance was measured. .

For the test, as shown in Figure 2, a tube with a diameter of 20 CII is made using a trial wire, and one of the same samples is placed inside it. Insert the I wire, 1
．． Repeat the operation of adding 1000 carts and sliding them,
The number of times until the core conductor was exposed was determined.

In FIG. 2, 10 is a loop of the trial electric wire, 11 is the trial electric wire passed through it, and 12 is a load.

(4) Heat-resistant solderability = An electric wire prepared in the same manner as in (3) was placed in molten solder heated to 350° C., and shrinkage and melting at that time were observed.

Regarding the shrinkage, when a 30IRIn insulator was put into solder, a shrinkage of 3 m or less was marked as ○, and a shrinkage of 3 m or more was marked as X. Also, 3
After being immersed at 50° C. for 1 minute, those with almost no change in insulation were rated ○, and those with some change were rated X.

If either of these shrinkage or melting is X, then
And so.

As is clear from Table 1, Examples 1 to 5 within the scope of the present invention are well-balanced in each characteristic.

On the other hand, in Comparative Example 1, the content of erucylamide 8 was less than the specified value, and the damage resistance was poor. Comparative Example 2 has a polyfunctional monomer content below the specified value, and has a heat resistance of half a meter +
! l is inferior. In Comparative Example 3, the plasticizer content was higher than the specified value, and the damage resistance was poor.

[Effects of the Invention] As is clear from the above explanation, according to the present invention, the properties of the semi-rigid vinyl chloride composition such as being inexpensive, easy to process, flame retardant, and freely colorable are completely impaired. A novel insulated wire can be obtained, which can provide lubricity to the insulator without causing damage to the insulator and eliminate accidents such as damage to the insulator and insulation of the conductor.

[Brief explanation of drawings]

FIGS. 1 and 2 are explanatory diagrams showing a W friction resistance measuring device and a damage resistance test method for samples of the present invention. 31.32...Sample sheet. 10... Ring of sample wire. 11...Sample electric wire.

Claims (1)

[Claims] (1) 100 parts by weight of polyvinyl chloride resin is coated with a resin composition containing 50 parts by weight or less of a plasticizer, at least 5 parts by weight of a polyfunctional monomer, and 0.2 parts by weight or more of a fatty acid monoamide; An insulated wire characterized in that the coating is cross-linked by radiation irradiation.