JPS59181414A - Low voltage cable - 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 The present invention relates to a heat-resistant low-quality F17 cable that does not propagate fire, and more particularly,
"Building" wire j (bui', ldl:n
, g 7nonol'T'e)
The present invention relates to an electric cable that has heat resistance that is within the range of F cables and is non-flame propagating.

Most of the cables that fall into this category, known by the name F, have conductor coatings consisting of compounds based on P, V, and C1.

One disadvantage of these compounds is U1, thermoplastic-c゛6. 4 City body 1m "maintains 11 cedar-like stability while heat acts on r'H/] - and does not get old. (:5) This is a serious problem '5: Occurrence. [The fact that 4.12 Identification-A is the fault of B is that, for example, in the connection with +d heavy electrical equipment J〆l゛, there is a When the conductor is in good contact, the heating that occurs at
It is sufficient to consider the danger to the user himself when the softening of his flash occurs.

In the known adhesive, the conductor coating is p, s/
', c.

1, 1.
It is impossible to have both a non-flame propagation characteristic and optimal mechanical and dielectric inertia.

￥1 In addition, fr, W> which has such non-flame propagation properties
In the compound, there is a very large inorganic filling (・) in the compound.
However, this is not possible as it would reduce the mechanical and insulating properties of the compound, and therefore the mechanical and insulating properties of the specialist, to unacceptable values. .

This Il,! This is also P,
14cm Yuage body and 1. However, it is a cape that makes a conductor rupture consisting of a compound # 1., 7+'= 7rl: Q(, 1 line).

This force υ causes the cape (4
) The problem of solving the problem of giving 61 bodies the stability of 1, but even if it is Noh, there are other problems. , or cable machine (contract and colorless edge 1r4N i'4: ':i h
None of the problems of setting =z appropriately - were solved.

In fact, in order to crosslink the compounds forming the 4'i) body coating of Ouvre, divinylbenze/, t-poly7lyldime, tacrylic acid, ster, and polyaryl-11
It was necessary to add an additive to the compound selected from medecrylic acid esters, such as trimethylpropane trimethacrylate-1. .

These additives are used during the crosslinking of P, V, C, p, v,
c, as well as the inorganic filler 4d of the compound, so if the amount of inorganic filler H present in the compound increases, the thrust force [1] will inevitably increase. Then, the L embankment is completed.

Furthermore, crosslinking additives such as p, v, c, etc. are actually necessarily caused/1, but p, v,
Even after cross-linking of c, (r(naturally, 1. and r?a) have the disadvantage of reducing the insulating properties of the compound's proboscis. electric special 1
In order to limit the amount of crosslinking agent in the compound by 1 rill, it is necessary to limit the amount of inorganic filler t7. In this way, the object of this invention is to obtain an optimum resistance to heat propagation and mechanical In addition to the characteristics, the optimum value of the dielectric modulus is also determined by I). It is about providing.

What forms the object of the invention is a low-current L-tope 11/ comprising a conductor surrounded by four extrusion waves 1-p.

1. The press]-H1 cover is in contact with the conductor J-1. In the secondary rupture surrounding the second target Φ1, the second target is 1:
R, 5 is made 1, this 1. The coating is py
, c, is a double body, but its primary counterpart is p,
V, c, ton 111- is 100, and for that 5
F that is more than the ratio of 60 weights; 1 Muiso J-f+-
Heat 1 whose ↑゛ body is P, V, C, containing 1' containing i 4@
Moon Φ subject compound 'proboscis to form 0, [1, the secondary (B Wahat・J
l-Hochu 1 punishment! It is characterized by being a compound mainly composed of P, V, and C, which are crosslinked by.

The invention will become more apparent from the following description, made only of a non-limiting example, with reference to FIG. 1, which is a perspective cut-away view of a length of a cable according to the invention.

It can be seen from the drawing that this cable contains a conductor 1 consisting of several stacked wires, t, < ij. This conductor 1 extruded secondary coating 2
Consisting of - the second wave 2 is undulated by the secondary coating 3,
These coatings are in close contact with each other.1. ing.

The primary wave f'σ2 consists of a thermoplastic congruence of P, V, C, and -[] secondary waves? U3 consists of a compound containing P, V, C, which is cross-linked by radiation, that is, a compound containing additives necessary for this cross-linking before being cross-linked.

Here, in order to form the primary coating 2 and secondary coating 3 of the cable according to the present invention, P, 7. C. "Biocompound" We will describe the general characteristics that the proboscis must have ('7).

P for forming the primary coating 2, 11. C. The main compound is 1 plastic and contains an inorganic filler sufficient to increase the desired dielectric and flame propagation resistance properties by +1J-j.

In particular, the fillers present in the compound in question consisting of calcium carbonate, magnesium carbonate, calcined kaolin and mixtures thereof are P, V, by weight 100.
The weight amount is 600% relative to C.

The amount of inorganic loading system in a compound is determined by weight ]00 and t or P
, 11. It is preferable to have a ratio of 60 to 20 for C. This is to obtain optimum values for the dielectric properties of the insulator 2 and its resistance to flame propagation.

Compounds consisting mainly of P, T/'', C, for the formation of the secondary coating 3 are divinylbenzene, polyallyl dimethacrylic ester and polyallyl trimethacrylic ester, such as I.limethylolpropane-trinotac. The weight of p, v, c, selected from relay 1 is 100.
as a cross-linking agent and P, 11. If the weight of C is 100, then (8
) in an amount not exceeding the proportion by weight of 0 to 0.

Furthermore, the inorganic filler for the compound forming the secondary coating 3 is composed of carbonate and magnesium carbonate, and is of the type obtained by precipitation, i.e. the type with a high specific area. Preferably, it is an inorganic filler of the type obtained by precipitation.A mixture of carbonate and red sea bream of the type obtained by precipitation can also be used as a compound filler for the formation of the secondary coating.

Here, a method for preparing a specific compound for coating 2 of a cable according to the present invention and a method for preparing a specific compound for coating 3! Preparation methods for specific compounds are described only in examples (and therefore below).

The compound for forming the primary coating 2 of the low voltage cable according to the invention is prepared according to the following method. In addition, each component is coated in proportions by weight.

- Polyvinyl chloride (PXf, C,) Weight: 1.
OO / Tal H yarn - ITJ Plastic agent (e.g. dioctyl phthalate or diintesophthalate ■/-1.) 50 - Inorganic light JAA'; (consisting of a mixture)-80-
Tribasic lead sulfate - 5 - Lubricant (e.g. stearic acid or basic lead stearate) - 0.5 Monooxidant (e.g. triphenol-A) - 0,2 The compound for forming the next coating 3 is prepared according to the following method. Note that each component is expressed as a weight ratio.

-Polyvinyl chloride (P, 'I1.C,) Monophthalic acid plasticizer (e.g. dioctyl phthalate-1 or dioctyl phthalate) with a total weight of 100
35-Inorganic filler 5-
Tribasic lead sulfate・-5-Basic lead stearate・・0.5
=Bisphenol A (antioxidant All) --0,2
-Trimethylolpropane-trimethacrylate (crosslinking agent) Using the specific compound described in 8-, apply the -1- of the conductor 1 simultaneously or continuously to the -sub-coating 2 and the secondary coating 3. Compound for forming (crosslinking agent by radiation) Eioshi 1tj
In particular, a low voltage group according to the present invention was manufactured.

In detail, the conductor has a composite cross-sectional area of 1.51111112.
5. It is formed from 30 wires with a total diameter of , m.

- The next coating is 0.7 mm, and the cross-linked car layer with radiation is the fifth layer; this secondary coating 3 is 0.1 nm If the thickness of (−
The depth of the primary ↑contamination does not exceed 15% of the size of the primary ↑contamination.

Above (LC)
The L-body was also subjected to radiation treatment. This is to completely crosslink the primary coating of Gupple i), and the processing method is 411
This is carried out by passing the entire body through a device 6 of a type known per se which provides a radiation dose equal to 10 mecads (Δlra, d). Ta. And the manufacturing speed is p, v
The production speed is comparable to the production speed of the well-known company that produces a conductive coating made of a heat-L11 plastic 1 (toy) compound.

- In order to determine the following properties of a conductive tube consisting of a secondary coating and an assembly of secondary coatings, a test was conducted in accordance with standard C11I20-11 using the entire cable made in the present invention.
The insulation LAY value Kt at 20'C is 120'C, and it is 1.2-C! -) I'17
5-Conductor Wave Covering Tan 7ji1. What about the whole family? 60% ζl of Σ (reducing the speed to the same value F) Resistance to the heat defined by the knitting method I - Breaking load and breaking point (C 1. Mechanical bendability of A' F Further, suspend the Kerr-length Guzor in a heated 1.
In order to determine the ability to hold i14-, a test was conducted using a cable related to Q'ζmotomotoaki.

Finally, tests were carried out in accordance with the standard CEI 20-22 to test the resistance to flame propagation. /C Features of the cable 1'1-
A test was conducted to find out. In order to carry out this test 1 test 4 - a 507++ length coupe according to the invention,
With an inner diameter of 30mm and a length of 10771! A rigid 1), V, C, hose ((introduced) as shown below.

That is, the hose has a shape that is a curved line that is made up of seven equal segments and has seven curved corners, and is a combination of an S-shape and an L-shape. At one end of the hose, I applied the minimum force necessary to withdraw the cable by sliding it from the hose.

Furthermore, in order to demonstrate the optimum characteristics of the cable according to the present invention in which the secondary coating having the above-mentioned characteristics and the secondary coating are simultaneously present, as a comparative test, the cable used for the primary coating of the cable according to the present invention was used. The above test was carried out on a cable having a conductor coating kl=r formed only from a thermoplastic compound consisting of P, V, and C.

A known cape with a conductor coating consisting entirely of a thermoplastic compound based on P, V, C, 'z, and a compound based entirely on P, V, C, k, crosslinked by radiation treatment. Similar tests were also carried out on another known cable having a conductor sheath made of It has a conductor equivalent to a single conductor and has a conductor coating thickness equal to the sum of the secondary coating and the thickness of the secondary coating of the cable according to the present invention. Ta.

The results of these tests are shown below.

As a result of the tests conducted, the following conclusions can be drawn.7
4) It will be done.

First, the secondary p
, v, c, Wang 14 [override (-) shows that the insulation constant lζ7. of the cable according to the present invention does not decrease at all. , V, C, and a cable having a conductive coating made of a biological compound.

The problem is that the absolute value of the cable according to the invention, which can be derived from the description of the specific shape of the above embodiment, that is, the thickness of the secondary coating is extremely thin, and even with such a thin coating, the It can be seen that the insulation of the conductor coating has a total influence on the value of the 5xE number.

10) The fact that it has been proven that the secondary coating of the cable connected to the present invention is made from a compound based on p, v, c, y, which has been crosslinked by radiation treatment. Despite the fact that it has surprisingly optimal insulation properties, it has the advantage of being fully utilized.

Furthermore, an examination of the results of the test 15 shown in FIG.

Finally, it can be seen that good manufacturing speeds are achieved in the case of the present invention, even though there is the security of crosslinking the secondary coating by radiation treatment +/C as such.

In fact, the manufacturing speed of the cable according to the invention, expressed in m7 minutes, is comparable to the manufacturing speed of "known" cables having conductors "148" consisting mainly of p, v, c, thermoplastic compounds. In contrast, the manufacturing rate of the known group, which has a conductor coating of a compound having p, v, c, 'z main components cross-linked by radiation treatment, is approximately 30%.
It's late.

The reason for this is not only that the thickness of the secondary coating of the Gupple according to the present invention is thin, but also that the inorganic filler is completely absent or exists only in a very small amount in the seventh coating. It is also possible to minimize the amount of crosslinking agent for ,

[Brief explanation of the drawing]

The first part is a part of the cable according to the present invention (
FIG. ■ Conductor 2-sublayer 4'J :+ -= ('KiIjicover'J'
Shilrou Fushi: l: Yu Bell Agioni (4 others) Figure 1, 3

Claims (1)

[Claims] 1) A conductor surrounded by four layers of extruded coating, the extruded coating comprising a primary coating in contact with the conductor and a secondary coating surrounding the secondary coating. In a low voltage tuple carrying a structured conductor, the secondary coating is P, T7
．． The secondary coating is made of a thermoplastic compound mainly composed of P, V, and C, containing an inorganic filler in an amount exceeding 60 parts by weight when the weight of C is 100, and the secondary coating is not subjected to radiation treatment. A low voltage cable characterized in that it is a biological compound of P, V, and C crosslinked by. 2) For forming the next coating? 17. A thermoplastic compound containing C as a main component contains an inorganic filler that preferably has a pattern needle with a ratio of 100 to 60 to 120 when the ends of P, V, and C are -. The low electrical ratio cable according to claim 1, characterized in that: (1) - to 3] P, V, crosslinked by radiation treatment forming the secondary covering;
Before crosslinking, a compound mainly composed of C, ? VC,
A crosslinking agent selected from divinylbenzene, polyallyl ditacrylate and polyallyl trimethacrylate in an amount not exceeding 16 when the weight of [00 and 1 to 1] is added. The low voltage cable according to claim 1, characterized in that: 4) A compound mainly composed of P, V, and C that is crosslinked by radiation treatment contains a crosslinking agent containing l-117 tyropropane-trimethacrylate l before being crosslinked. A low voltage cable according to claim 1. 5) Has the crosslinking been completed by the radiation treatment constituting the secondary coating? A compound whose main components are V, C, and P, V, C
, the low voltage according to claim 1, 3, or 4, characterized in that it contains an inorganic filler in an amount that does not exceed a weight ratio of 10 to 100. cable. 6) Generation of cross-linked P, V, C, by radiation treatment (2) - #L, 1 Shin 4, which is broken down by the compound containing
A is an i-filled inorganic filler with 4'() and -4'' marks.
Ru! 1! ■Low electric power Lf: cable according to claim 1, 3, 4, or 5. 7) The IV of the secondary coating is 5㎜ of the thickness of the secondary coating.
A low voltage tuple according to any of the preceding claims, characterized in that it does not exceed IJM.