JPH06103828A - Polyethylene chloride sheath cable and manufacture thereof - Google Patents

Abstract

PURPOSE:To improve the tensile property of a coating layer by grafting a composition, which is prepared by mixing polyethylene chloride with an epoxy- based stabilizer and nylon fiber-containing polyethylene chloride in specified ratio, with an organic silane compound, coating a conductor with the resulting grafted polymer, and carrying out cross-linking with moisture. CONSTITUTION:An insulating material is prepared by grafting a composition containing 100 pts. by wt. of polyethylene chloride, 1-100 pts. by wt. of an epoxy- based stabilizer, and 5-100 pts. by wt. of polyethylene chloridel containing 1-100 pts. by wt. of nylon fiber with an organic silane compound. Then, a conductor is coated with the insulating material and at the same time the insulating material is cross-linked in the presence of silanol condensating catalyst by exposing it to moisture.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chlorinated polyethylene sheathed cable having a chlorinated polyethylene composition capable of crosslinking at low temperature and atmospheric pressure as a coating layer, and a method for producing the same.

[0002]

2. Description of the Related Art Cables and electric wires are produced by providing a coating layer as a sheath on a conductor or a conductor shielding layer, and crosslinking the coating layer. Chlorinated polyethylene is used as the sheath material.

This chlorinated polyethylene is reacted with an organic silane compound in the presence of peroxide and exposed to water in the presence of a silanol condensation catalyst to give
By silane-crosslinking chlorinated polyethylene as described above, there is an advantage that a special apparatus such as a high-temperature and high-pressure vulcanization apparatus is not required and a cable or the like can be produced only by a general extruder.

[0004]

However, when a composition obtained by grafting an organic silane compound on chlorinated polyethylene and crosslinking the same in the presence of a catalyst and water is applied to a sheath such as a cable, the tensile strength which is important for the cable is increased. May be inferior.

Therefore, the present invention was devised in order to effectively solve the above-mentioned problems, and an object thereof is to provide a novel chlorinated polyethylene sheath cable capable of improving the tensile properties of the coating layer. It is provided.

[0006]

Means for Solving the Problems The present inventors have conducted various research and development in order to obtain a coating layer having excellent tensile properties based on the knowledge that a chlorinated polyethylene composition is coated as a sheath of a cable. As a result, focusing on the fact that the tensile properties of the coating layer are improved by adding chlorinated polyethylene containing nylon fibers to the chlorinated polyethylene composition, the mixing amount of these compounds was specified.

That is, in order to achieve the above object, the first invention is such that 1 to 100 parts by weight of an epoxy stabilizer and 1 to 100 parts by weight of nylon fiber are added to 100 parts by weight of chlorinated polyethylene.
A composition obtained by adding 5 to 100 parts by weight of chlorinated polyethylene containing 100 parts by weight of an organosilane compound is formed into a mixture, and the mixture is coated on a conductor.
This is a chlorinated polyethylene sheath cable which is formed by exposing it to moisture in the presence of a silanol condensation catalyst and crosslinking it, and the second invention is 1 to 100 parts by weight of an epoxy stabilizer per 100 parts by weight of chlorinated polyethylene. 1 to 100 parts by weight of nylon fibers and 5 to 100 parts by weight of chlorinated polyethylene are added to the composition to graft an organosilane compound to form a mixture, and the mixture is coated on a conductor. Is a method for producing a chlorinated polyethylene sheathed cable in which the resin is exposed to water in the presence of a silanol condensation catalyst to be crosslinked.

Examples of the epoxy stabilizer include bisphenol A diglycidyl ether, glycidyl vinyl ether, and epoxidized soybean oil. Further, the addition amount of the epoxy stabilizer is preferably 1 to 100 parts by weight based on 100 parts by weight of the resin component containing polyvinyl chloride and the resin component containing polyvinyl chloride. It has a remarkable effect to prevent Further, when the epoxy stabilizer is used together with a lead stabilizer such as tribasic lead sulfate, a greater stabilizing effect can be obtained.

The organic silane compound has a general formula RR ₁
Examples thereof include silane represented by SiY. In the general formula of this silane, R represents a monovalent olefinically unsaturated hydrocarbon group or hadrocarbonoxy group, and represents a monovalent olefinically unsaturated radical composed of carbon and hydrogen and optionally oxygen. Examples of such radicals are:
Vinyl, allyl, budenyl, cyclohexenyl, cyclopentadienyl, diclohexadienyl and the like,
Vinyl radicals are preferred.

Formula CH ₂ ═C (CH ₃ ) COO (CH ₂ ) ₃ —, Formula CH ₂ ═C (CH ₃ ) COOCH ₂ CH ₂ O (C
H ₂ ) ₃ −, And vinyl radicals are preferred.

Y represents a hydrolyzable organic group, and an alkoxy or alkoxy radical having a radical of 6 or less carbon atoms (for example, methoxy, ethoxy or butoxy), an acyloxy radical having a radical of 6 or less (for example, methoxy, ethoxy or butoxy). formyloxy, acetoxy or propionohydrazide alkoxy radicals), oxime radicals having 14 or fewer carbon atoms (e.g., formula -ON = C (CH ₃₎ -, the formula -ON
= CCH ₂ C ₂ H ₅ ).

R ₁ represents a monovalent hydrocarbon group having no aliphatic unsaturation, and includes, for example, methyl, ethyl, propyl, tetradecyl, octadecyl, phenyl, benzyl or tolyl, and R or Y ₂ It can also be shown.

The organosilane compound preferably has the formula RSiy ₃ and contains _three hydrolyzable organic groups, the most preferred silanes being vinyltriethoxysilane and vinyl. It is trimethoxysilane. It should be noted that silanes having only two hydrolyzable groups, such as vinylmethyldiethoxysilane and vinylphenyldimethoxysilane, are also effective.

The proportion of organosilane compound depends in part on the reaction conditions and in part on the degree of modification desired in the chlorinated polyethylene. The actual ratio is 0.1 to 20% by weight with respect to the weight of chlorinated polyethylene, but generally 1 to 8% by weight is preferable.

As a compound which generates a free radical when the organosilane compound is grafted on the chlorinated polyethylene, a free radical site can be generated in the chlorinated polyethylene, and the reaction temperature is 6 minutes or less, preferably 1 A compound having a half-life of minutes or less is preferable. The best known and preferred radical generating compounds for use in this invention include organic peroxides and peresters [eg benzoyl peroxide, dichlorobenzoyl peroxide, dicumyl peroxide, di-tert-butyl peroxide, 2,5- Diethyl-2,5-di (peroquinbenzoate) hexyne-3,1.3-bis (t-butylperoxyisopropyl) benzene, lauroyl peroxide, tert-butyl peracetate,
2,5-Dimethyl 2.5-di (t-butylperoxy)
Hexyne-3,2,5-dimethyl-2,5-di (t-butylperoxy) hexyne and tert-butylperbenzoate], azo compounds (e.g. azobis-isoptyronitrile and dimethylazodiisobutyrate),
The amount is 0.2-based on the weight of chlorinated polyethylene.
It is preferably 1% by weight.

For the grafting reaction of the organic silane compound, any of kneader, Banbury, and extruder can be adopted.

Chlorinated polyethylene containing nylon fibers can be obtained by kneading chlorinated polyethylene and nylon fibers with a kneader or the like and then melt spinning.

Examples of silanol condensation catalysts include dibutyltin dilaurate, stannous acetate, stannous octoate, lead naphthate, zinc octate, iron-2-
Metal carboxylates such as ethylhexoate and cobalt naphthenate, titanium esters and chelates such as organometallic compounds such as tetrabutyl titanate, tetranonyl titanate and bis (acetylacetonyl) di-isopropyl titanate, ethylamine, hexyl. Mention may be made of amines, organic bases such as dibutylamine and viveridine, acids such as mineral acids and fatty acids, preferably organotin compounds such as dibutyltin dilaurate, dibutyltin diacetate and dibutyltin dioctate. In addition to the above components, an orientation filler may be added.

As the inorganic filler, any of white fillers such as talc, clay and calcium carbonate, and carbon black can be used, but carbon black, particularly fine thermal furnace black (FT carbon) has good rubber elasticity. It imparts toughness and is most preferable. An appropriate amount of the inorganic filler added is about 10 to 100 parts by weight based on 100 parts by weight of chlorinated polyethylene.

In the present invention, in addition to the above-mentioned components, a plasticizer such as paraffin chloride or dioctyl phthalate, and an antioxidant or the like may be appropriately added in order to increase thermal stability.

[0021]

As described above, according to the present invention, since the tensile properties of the coating layer coated on the conductor can be improved, it is possible to manufacture a chlorinated polyethylene sheath cable having excellent tensile properties.

[0022]

EXAMPLE An example of the present invention will be described in detail below.

First, Examples 1 to 4 and Comparative Examples 1 to 1 in Table 1
According to the formulation as shown in each column of 3, the compounding agents other than dicumyl peroxide and vinyltrimethoxysilane shown in Table 1 were kneaded for 15 minutes with a rubber roll having a diameter of 150 mm set to a temperature of 120 to 130 ° C., and a sheet was prepared. I made it.

Next, this sheet was crushed by a crusher at room temperature, and dicumyl peroxide was added in a closed system at a temperature of 60 ° C.
After impregnation with vinyltrimethoxysilane, head: 180
℃, cylinder 1: 180 ℃, cylinder 2: 130 ℃
40 for each temperature and screw rotation speed of 10 rpm
The graft reaction was carried out using an m / m extruder (L / D = 22).

Next, 10 wt% of the pellets of the catalyst masterbatch having the composition shown in Table 2 was added to the above silane grout compound pellets, and the pellets were added using a 90 mm extruder (L / D = 22). As shown in FIG. 1, the cable conductor 1 was coated with the cross-linked polyethylene layer 2 around the four core wires with the conductive layer 3 interposed therebetween to form a sheath layer (coating layer) 4 to fabricate a cable. The extrusion conditions are as follows: cylinder 1: cylinder 2: 120 ° C., cylinder 3: cylinder 4: neck: head: die: 180 ° C., and the screw rotation speed is 20 rpm.

Next, the produced cable was exposed to saturated steam at a temperature of 80 ° C. for one day and cross-linked to obtain each sample. These samples (cables) were examined for tensile properties and compression set, and the results are shown in Tables 1 and 2.

[0027]

[Table 1]

The tensile properties are based on Japanese Industrial Standard JIS-K-63.
According to No. 01, a sample punched out with dumbbell No. 3 was subjected to a tensile test of 500 mm / min using a Shopper type tensile tester, and the tensile strength and the elongation were examined.

[0029]

[Table 2]

As a result, as is clear from the results shown in Table 1, the samples of Examples 1 to 7 according to the present invention all showed favorable values for tensile properties and compression set, and the tensile properties were improved. Has been done. On the other hand, in Comparative Example 1 using only chlorinated polyethylene, it is found that the tensile strength is inferior. In Comparative Example 2, 200 parts by weight of chlorinated polyethylene containing nylon fiber was added in a large amount, but the elongation was poor.

Therefore, an organic silane compound is grafted to a composition obtained by adding an epoxy stabilizer and an inorganic filler to chlorinated polyethylene, and a specified amount of chlorinated polyethylene containing nylon fibers is mixed with this composition. A chlorinated polyethylene having excellent tensile properties can be obtained by coating the conductor with a coating layer having good tensile properties and compressive strain by coating it on the conductor and exposing it to moisture in the presence of a silanol composite catalyst for crosslinking. Sheath cables can be manufactured.

[0032]

As described above in detail, according to the present invention, there is an excellent effect that a chlorinated polyethylene sheath cable having a coating layer with excellent tensile properties can be produced.

[Brief description of drawings]

FIG. 1 is an enlarged sectional view showing an embodiment of the present invention.

[Explanation of symbols]

 1 conductor 2 insulator 3 conductive layer 4 coating layer

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁵ Identification number Office reference number FI technical display location H01B 13/22 Z 7244-5G // C08K 7/02 KFT 7242-4J C08L 23/28 LDA 7107- 4J

Claims (2)

[Claims] 1. 5 parts of chlorinated polyethylene containing 1 to 100 parts by weight of an epoxy stabilizer and 1 to 100 parts by weight of nylon fiber to 100 parts by weight of chlorinated polyethylene.
To 100 parts by weight of an organic silane compound are grafted to form a mixture, the mixture is coated on a conductor, and the mixture is exposed to moisture in the presence of a silanol condensation catalyst to form a mixture. A chlorinated polyethylene sheathed cable. 2. 5 parts of chlorinated polyethylene containing 1 to 100 parts by weight of an epoxy stabilizer and 1 to 100 parts by weight of nylon fiber to 100 parts by weight of chlorinated polyethylene.
˜100 parts by weight of an organic silane compound is grafted to form a mixture, the mixture is coated on a conductor, which is then exposed to moisture in the presence of a silanol condensation catalyst to crosslink. Method for producing chlorinated polyethylene sheathed cable.