JPH0449722B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Field of Application] The present invention relates to an insulated wire, particularly an insulated wire coated with a polyvinyl chloride composition having excellent damage resistance. [Conventional technology] Insulated wires used for internal wiring in equipment, etc. not only have excellent mechanical and electrical properties that can withstand long-term practical use, but also have toughness, damage resistance, and terminal resistance that can withstand harsh wiring or repair work. Various properties such as peelability of the insulator are required. Various insulating materials are used for these, but among them, polyvinyl chloride has a good balance of properties, is flame retardant, can be colored freely, is inexpensive, and has good processability. It is the most commonly used material because it has several characteristics that other materials do not have. Insulated wires for internal wiring in devices using polyvinyl chloride include vinyl-nylon double insulated wires made of polyvinyl chloride coated with nylon, or semi-rigid vinyl wires coated with a semi-rigid polyvinyl chloride composition alone. is being put into practice. [Problems to be solved by the invention] Among these, the vinyl-nylon double insulated wire has excellent mechanical strength, particularly abrasion resistance, and cut-through resistance because it is coated with nylon on the outside. Because of this, manufacturing processes such as double extrusion are necessary, which naturally increases the price. In addition, there is a natural limit to the recent demand for thinner wires as equipment becomes smaller and lighter. On the other hand, although semi-rigid vinyl wire eliminates the drawbacks of these double insulated wires, it has inferior mechanical and thermal properties compared to nylon, so one or several wires must be pulled out from the harnessed wire for wiring. In many cases, the friction between the wires caused damage to the insulation, and in some cases, the conductor broke. The present invention has been made based on the above, and by providing a coating made of a polyvinyl chloride composition with extremely low frictional force, conductor breakage will not occur even when one or several wires are pulled out from a bundle. Of course, the present invention provides a new insulated wire that significantly reduces insulation damage and has excellent mechanical strength. [Means for solving the problem] The insulated wire of the present invention is produced by adding a plasticizer to 100 parts by weight of a partially crosslinked polyvinyl chloride resin having a tetrahydrofuran-insoluble gel content of 10 to 70% by weight and the remainder being a tetrahydrofuran-soluble content. It is characterized in that the conductor is coated with a resin composition containing 40 parts by weight or less and at least 0.2 parts by weight of fatty acid monoamide. In the present invention, the crosslinked portion of the partially crosslinked polyvinyl chloride resin is present in the composition and the molded article as particles, and the presence of these grains causes minute irregularities to appear on the surface of the extrusion molded article, resulting in exudation of fatty acid monoamide. In combination with this, excellent sliding properties (static friction coefficient and dynamic friction coefficient) are exhibited, and the electric wires are less likely to be thermally fused together. In the present invention, the partially crosslinked polyvinyl chloride resin having a gel content insoluble in tetrahydrofuran includes diallyl phthalate, diallyl maleate, triallyl cyanurate, triallyl trimellitate, trimethylolpropane trimethacrylate, and divinylbenzene in the vinyl chloride polymerization system. It is manufactured by a method in which a polyfunctional monomer such as the following is added and polymerized to produce an arbitrary amount of gel content. In the present invention, it is necessary to use a gel with a gel content of 10 to 70% by weight; if it is less than 10% by weight, desired properties such as surface polishing properties cannot be obtained, and if it exceeds 70% by weight, processing is required. Sexual problems will arise. This processability is naturally related to the degree of polymerization of the remaining tetrahydrofuran soluble portion, but the degree of polymerization of the remaining portion is not particularly limited unless there is a problem with processability, but it is generally preferred that the average degree of polymerization is 3000 or less. In the present invention, a crosslinked polyvinyl chloride resin with a gel content of 100% is prepared and mixed with a general polyvinyl chloride resin soluble in tetrahydrofuran so that the gel content insoluble in tetrahydrofuran is in the range of 10 to 70% by weight. It is also possible to In addition, the tetrahydrofuran-insoluble gel content is 10 to 70.
Vinyl chloride and ethylene, within the weight% range.
It may be a copolymer with propylene, vinylidene chloride, vinyl acetate, etc., or a graft copolymer with ethylene-vinyl acetate, chlorinated polyethylene, etc. Furthermore, it may be a copolymer with polyvinyl chloride and ethylene-vinyl acetate, nitrile rubber, etc. Blends with chlorinated polyethylene, acrylonitrile-butadiene-styrene, etc. are also included. Examples of plasticizers include phthalic acid esters such as di-n-octyl phthalate, di-2-ethylhexyl phthalate, diisodecyl phthalate, and ditridecyl phthalate, fatty acid esters such as dioctyl adipate, dioctyl mazerate, and dioctyl sebacate, and tricresyl phosphate. ate, phosphoric acid esters such as trioctyl phosphate, epoxidized soybean oil, epoxidized substances such as epoxy resin, polyesters of adipic acid and sebastic acid, trioctyl trimellitate, tri-n-octyl trimellitate, etc. Examples include trimellitic acid ester, which can be used alone or in combination. The content of plasticizer must be 40 parts by weight or less; if it exceeds 40 parts by weight, the mechanical properties will deteriorate.
Inability to achieve sufficient damage resistance. There is no particular limitation as long as it is 40 parts by weight or less, but it is preferably 20 to 40 parts by weight. In the present invention, fatty acid monoamides include erucylamide and oleylamide, all of which reduce frictional resistance without substantially impairing the excellent properties of polyvinyl chloride. This is because a thin film is formed on the surface of the polyvinyl chloride coating due to oozing of fatty acid monoamide, and since fatty acid monoamide has low volatility, it can continue to maintain this performance over a long period of time. The reason why the amount of fatty acid monoamide added is set to 0.2 parts by weight or more is because if it is less than this, there is almost no effect of lowering the frictional resistance. The upper limit depends on the nature of the polyvinyl chloride used,
It is not specified because it changes depending on the mixing ratio of polyvinyl chloride plasticizer, etc., but since fatty acid monoamide has extremely high slip hardening, adding a large amount will significantly reduce kneading and extrusion processability.
The upper limit is considered to be about 3 parts by weight. In the present invention, in addition to the above ingredients, various stabilizers such as lead salts and organotin stabilizers, various metal soaps such as stearic acid metal salts, various antioxidants such as phenolic antioxidants, halogens, phosphorus, etc. Various flame retardants such as compounds, flame retardant aids such as antimony trioxide and zinc borate, fillers such as clay, calcium carbonate, and aluminum hydroxide, colorants, ultraviolet absorbers,
Various other compounding agents used in ordinary vinyl chloride compositions can also be added. [Example] Various properties of molded articles made from compositions based on the formulations shown in each example in Table 1 were measured. The results are shown in the lower column of Table 1. The characteristics were measured as follows. (1) Static friction coefficient, dynamic friction coefficient: Press molded 1
Two sheets of mm x 30 mm x 100 mm are stacked together and a load of 1850 g is placed at 20℃ as shown in Figure 1.
The static and dynamic friction coefficients when moving at a speed of mm/min were determined from equations (1) and (2). In Fig. 1, 1 is a rail, 2 is a sliding block, 31 and 32 are sample sheets, and 4 is a sliding block.
is a load, 5 is a motor, 6 is a load cell, and 7 is a recorder such as a chart. Static friction coefficient (μs) = Static friction force (Fs) / Load (W) …(1) Dynamic friction coefficient (μk) = Dynamic friction force (Fk) / Load (W) …(2) (2) Damage resistance: Conductor An insulated wire with an outer diameter of 1.1 mm coated with a 0.3 mm thick annealed copper wire with a chamber size of 0.5 mm was used. The test was conducted using a sample wire with a diameter of 20 cm as shown in Figure 2.
A loop was made, one of the same sample wires was inserted into the loop, and the sliding operation was repeated while applying a load of 1100 g, and the number of times until the core conductor was exposed was determined. In Fig. 2, 10 is a sample wire, and 11 is a ring.
is the sample electric wire passed through it, and 12 is the load. (3) Fusion property: The diameter of the electric wire made in the same manner as (2)
The wires were wound around a 20 mmφ metal rod so that they were in contact with each other, and after heating at 150°C for 1 hour, the fusion of the insulators was observed. Incidentally, those that were not fused were rated as ○, and those that were fused were rated as ×.

【table】

[Table] As is clear from Table 1, Examples 1 to 5 within the scope of the present invention have well-balanced properties. On the other hand, in Comparative Example 1, the content of tetrahydrofuran-insoluble gel was less than the specified value, and the damage resistance was poor. In Comparative Example 2, the content of gel insoluble in tetrahydrofuran was higher than the specified value, but the processability was poor and a sample could not be prepared. In Comparative Example 3, the content of plasticizer exceeds the specified value, but the damage resistance is poor. In Comparative Example 4, the content of erucylamide was less than the specified value, and the damage resistance was poor. [Effects of the Invention] As is clear from the above-mentioned invention, according to the present invention, the polyvinyl chloride composition is inexpensive, has good processability, is flame retardant, can be freely colored, and does not impair its various properties. A new well-balanced insulated wire that can eliminate accidents such as damage to the insulation and disconnection of the conductor can be obtained.

[Brief explanation of the drawing]

FIGS. 1 and 2 are explanatory diagrams showing a frictional resistance measuring device and a damage resistance testing method for samples of the present invention. 31, 32...sample sheet, 10...sample electric wire loop, 11...sample electric wire.

Claims (1)

[Claims] 1 Tetrahydrofuran insoluble gel content 10-70% by weight
Add a plasticizer to 100 parts by weight of partially crosslinked polyvinyl chloride resin, the remainder of which is tetrahydrofuran soluble content.
40 parts by weight or less, at least fatty acid monoamide
An insulated wire comprising a conductor coated with a resin composition containing 0.2 parts by weight.