DE1665452A1 - Wires, especially transmission conductors - Google Patents

Description

Wires, especially transmission conductors

Wires, especially transmission conductors, are twoks Color-coded to facilitate processing and essentially manufactured using two methods. The one is based on the fact that most of them already have a wired loop insulated conductors are overmolded with a white or colored plastic compound? in the other procedure a wrapping takes the place of the plastic compound with white or colored yarn, which is optionally treated with an Iransparentlaok both procedures are manifold

Bs are already wires, especially transmission conductors and multi-core cables made therefrom are proposed been, which by a resting on the metal, white or color-coded envelopes that are also in the oven, with or without the effect of oxygen, elaetisoh drying binders consists in which white or colored pigments- contained in such quantities are that the metal of the wire is deoed. There

UniU warehouse. . ' rt. 7 Paragraph I Paragraph 2 No. 1 8att 3 detXnderuneöfles. ν. 4. Ö. 1 £ , .χ

0098 $ 4/0737

In this case, no wandering softeners should be contained in the binding agent, soluble dyes can also be used can also be used.

The wires or transmission conductors made in this way have many advantages over what is known up to now · No expensive machines are necessary. Even Wires with a cross-section below 0.5 mm can can be easily marked. The marked wires hardly take up much, weight and material requirements are poor · The flexibility is practically as good as that of the untreated wires. As the marking layer is not thermoplastic, its layer thickness and its insulation capacity decreases even with increased ! Temperatures are not reduced by pressure. The selection of binders and pigments is large, so that practically pure white and an almost unlimited A range of colors can be produced, which allows the production of multi-core cables · The adhesion is good, also the reokability, also lead hard-drying Binders that are not only mechanically advantageous produce good results because of the strong Curvature of the subsurface a surprisingly small amount of ELgment to color and cover the subsurface is sufficient so that the reduction in reactivity caused by the pigment is no longer significant falls.

It has now emerged that if the Structure of the wires allows further improvement is. ·

It has been found that excellent wires, especially

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Special transmission conductors and multi-core cables made from them are identified by a insulating cover with a transparent, preferably pigment-free insulating varnish and one of these lying on top of the second wrapping that comes out in the oven. "elastic drying binders consists in which white or colored pigments covering the conductive metal marking contain j3ind.

It was not foreseeable that the wires constructed according to the invention would not produce the expected cracking showed. Often the stretchability of the opaque pigmented Layer of varnish larger than if they were direct. on which the ^ metal rests. Furthermore, the wires C Invention a far greater breakdown voltage. than results from adding up the amounts of transparek. , - <n Topcoat layers and the white or colored paint layers results.

That the formation of cracks in the pigment-rich markings is imperfect fails to appear on a magnet wire, or is not promoted at all, could not be foreseen, because after one generally valid rule of reason to contain more pigment must "as the ceiling, and because one is above all on one pigment-free ("fat") base must never apply a pigment-containing ("lean") paint, otherwise Cracks appear «)".

In the manufacture of wires for the electrical industry are determined can be done in the usual way Apply the desired number of layers of the insulating varnish, and two to four layers as required

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Apply marking varnish as additional security. But you can also use the marking varnish in the electrical Include values of the overall paintwork, i.e. # save colorless insulation layers if the cross-section the transmission conductor can be kept particularly small target. You can also use the marking varnish at the. Consider choice of insulating varnish. Because the lean, opaque pigmented marking varnish without hesitation on a fatter, even completely pigment-free, insulating varnish layer applied the insulating varnish layer no longer needs to be as hard as it is with varnish-free ones Layers preferred.

You can confidently if you do not value particularly good ones electrical properties, instead of an insulating varnish, take another transparent varnish that corresponds to its intentions. The advantage of The stretchability of the white or colored varnish and that its behavior is not influenced by the metal of the wire will remain.

In addition, you can use certain cables for cable production head in a familiar way with as little as possible partially spun around hygroscopic yarn to make the marking even more conspicuous and at the same time a to secure a certain distance of the ladder from each other »

In all cases, the enameled wire manufacturer has the advantage of the pigment-free, possibly translucent pigmented ₉ transparent lacquer, and to apply the opaque pigmented white or colorful paint with the same apparatus, whereby the withdrawal speed

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"With pigmented paint just like" with the known ones Insulating varnishes according to the Troök ^ inequalensohaften des Paint, the temperature "and the length of the oven. As a new, but of course, only comes in addition, the solvability of the transparent layer by the solvent of the white or colored lacquer must take into account, so ζ, Β. no rake marks containing cresol "on a cresol-sensitive one May apply an insulating layer

With the thermosetting ^^ synthetic resin and binders, which are suitable for producing decoctional white and colored coatings, the number of is taken into account coming raw materials large * The selection of binders is very big »because binders are now also being used, which adhere badly directly to the metal of the wire or would not wet the metal sufficiently, and auoh poorly insulating binders because of the surprising-αβη / ν The breakdown voltage obtained lead to considerable final values for the fully marked conductors. All the known binders can be used that dry elastically in the oven and, for example, for sheet metal lacquers can be used, yes, ready-made pigmented, elastically drying industrial paints

Even weather-resistant building protection paints with elastic drying binders lead to good results, i.e. * including phthalate lacquers that are unpigmented in the Wire detachments fail completely, come in as binders Should be considered in these ready-pigmented varnish the cornerability of the oven-dried on the wire Layer does not meet the requirements, so

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can easily cause this error at any time Addition of binders can be corrected. These lacquers are for sufficient coverage of flat surfaces pigmented, so that they, without damage to the wires, which require surprisingly little pigment, a larger amount of binders can be added, as a result of the reduced pigment volume the stretchability increases considerably.

A drying alkyd resin that has been modified with a maximum of 40 $ as -ster-bonded fatty acids, which are predominantly or entirely drying, monobasic fatty acids, is preferably isomerized and / or contain conjugated double bonds, has proven itself as the binding agent for the marking paint Also binders made from alkyd resin modified with non-drying, monobasic fatty acids, which is combined with a melamine and / or urea resin. Of particular technical importance is a binder consisting of an epoxy resin, preferably made from 2,2-bis (4-hydroxyphenyl) propane and epichlorohydrin, with an epoxy equivalent weight of 500 to 2000, which is esterified with partially or completely drying, monobasic fatty acids, which are preferably isomerized and / or contain conjugated double bonds. The epoxy resin can have been reacted with melamine and / or urea resins instead of the fatty acids. It is also possible to successfully use binders for the invention which consist of a mixture of a polyester alcohol and a polyisocyanate which only becomes reactive when exposed to heat, with

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it has proven particularly useful in the mixture incorporate a soluble polyamide. After a Embodiment of the invention, a urea resin plasticized with polyester is used as a binder a.

Within each type of the binders explained above as being preferred, hardness, suppleness, Influence drying speed, etc. in a manner known per se in paint technology. Solvents also play a role here | to this In recent times, water has also belonged, namely with certain alkyd, acrylic, phenol, urea, guanamine and melamine resins, as well as their combinations; The characteristic caused by the individual binders Properties of the paint layers that emerged from them are retained.

The hard resin-containing types of siacäöl are used for Only choose colored wires if, in terms of stretchability, it is only required that the wire be without Damage to the colored layer can be twisted. Stand oil binders are not used for white layers in question. Alkyd resins modified with fatty acids yellow significantly less and are more stretchable combinations with polyisocyanates can be even better «. It is It is also known that epoxy resins have particularly good lacquer properties and that they are free of fatty acids Terephthalic acid polyester has proven its worth in the paint industry. (See Austrian patent specification 253 644 and British patent specification 1,041,077). The prior art also includes the polyimide resins,

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which, not only mechanically and electrically, but also distinguished by their heat resistance.

In addition to the large number of binders used in the White and colored paints prove their worth, there are enough pigments which enable the production of the desired color tones. Of course, the pigments and any fillers used must also meet certain requirements be perfectly processed in terms of paintwork.

Coarse pigments and fillers are ruled out, as those brought about by the applied marking varnish The increase in cross-section per pass is approximately 10 μm and protrusion from the layer is undesirable. You will also get sharp-edged pigments and fillers try to avoid them because they will crack if the white or colored wire is subjected to heavy mechanical stress can cause.

Fine, not sharp-edged pigments will be preferred and, in a known manner, with known means, ensure that the pigments do not settle in a disruptive manner. Pigments that conduct electricity must be switched off and active pigments, which result in thickening by reaction with the binder, must be used sparingly and only when they are needed for correction purposes. If appropriate, is heat-resistant to fining, ^etc. soluble dyes use, which now can no longer lead to poor adhesion because the sugar-coated paint does not come into contact with the metal of the wire.

If the binder is dissolved in a phenol or

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gives off phenol during the drying process, one is on the Pay particular attention to the inertness of the pigments. A preliminary examination Such pigments in boiling phenol or cresol are also recommended.

The examples below illustrate the

Invention. ·. ■ - .. ', ■■.

Unless otherwise noted, the marking varnishes were made carried on a copper wire (Durahesser a 1 mm),

the "with a 25 ^ Tu» diode layer of pigment-free lerephthalsäure * pQlyeaters was isolated * The Duröhsohlageepannung was, in WL ttel H50 PY ent ~ speaking ^ 138 kV per mm "

In order to attract the Marklerlacke. euehett a horizontal shaft furnace of 2 length used »The wire was often tfo through a dip containing the white or colored lacquer and then over a doormat pulled through the furnace shaft, until the desired layer thickness was achieved. Each experiment was carried out only once were not determined.

The transmission conductors marked were as follows Subjected to tests; .

* ·· Härtec The hardness was determined with pencils in accordance with DIN 46453 (but without prior treatment with Iränklaok) «

2 · Iwists. Hit about 3 - 4 revolutions per see. a double wire was twisted so tightly that each of the

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"appeared" above "three times per cm on both wires, i.e. . 6 wire backs per cm were counted.

3 · 25 $ elongation. In 7 see. a wire of 100 cm length was stretched to 125 em *

4 Wickellooke.a. The marked conductor, stretched according to 3), was wound around a mandrel of three times the diameter (unless otherwise stated) a mandrel of 3 mm with a tensile load of 1 kg with 280 tfm rotations P ^ o min. To a 7 om long curl,

5 » Winding curl b» The unstretched, marked conductor was wound around a mandrel of the same diameter (unless otherwise stated a mandrel of 1 mm JO) with a tensile load of Tkg at 280 revolutions per minute to form a 7 om long curl *

6y Ihmihacb! .Ag3spannung 1. The marked conductor was laid in one turn around a polished metal cylinder with a diameter of 5 cm and loaded with a tensile strength of T kg 100 Y per see, 'measured. The scale of the measuring device ended at 6000 V, so that higher breakdown voltages could no longer be determined.

7 · Breakdown voltage 1a. This breakdown voltage

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is that of the opaque pigmented marking varnish, applied directly to the metal of the conductor and converted to a layer thickness of 1mm.

8> G-e gain in volts. Corresponds to the following difference: the breakdown voltage found minus the breakdown voltage sum, calculated from the individual lacquer layers (the transparent wire lacquer layer and the opaque pigmented marking layer). - -

9. Breakdown voltage 1b, corresponds to the breakdown voltage of the opaque pigmented marking layer when this is applied to an already existing transparent insulating layer of the wire - a "enameled wire", converted to a layer thickness of 1 mm.

Comment; All values that were obtained when the marking layer was applied directly to the conductor metal (Gu) - the transparent insulating varnish is missing - are shown in brackets ().

Table I shows the properties that with commercially available finished products as marking varnish Transmission conductors during mechanical testing were obtained. The 25 / µm thick insulation layer of the conductor consisted of a polyesterimide. In all Cases was the stretchability, regardless of whether the Conductor, whether or not insulated with a wire enamel, for Transmission conductor completely sufficient; even at Twists did not result in any defects. Not until the extremely strict test by twisting curls

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cracks appeared, and contrary to expectations in the same On enamelled wire as well as with uninsulated enamel, i.e. on bare copper »The pigment-free surface So it is not detrimental to the stretchability of the pigmented marking lacquers.

The white and colored sheets of Tables II to Π were specially prepared for the experiments reproduced there. The pigments were processed in the usual way on a three-roll mill rubbed. The viscosity was about 100 seconds. set according to DIN 53 211, whereby the in the Lacquer industry common solvents for the production of the lacquers and for the adjustment of the Viscosity were used.

In Table II the tests with a relatively large amount of pigment in the paint layer are summarized, in Table III those with small but sufficient amounts of pigment for coverage reproduced

This division is made because of the amount of pigment exerts a significant influence on the stretchability of the lacquer layers, so that the influence of the Binder can only be recognized with the same or approximately the same amount of pigment .. The amount of pigment is given in volume, for it is not the weight but the volume of the rigid pigment that has its effect Influence on the mechanical properties of the paint layer the end.

A look at Table II shows that the mechanical Values for all paint colors were good despite their very different composition. The tight twisting causes

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gently, despite the unnecessarily high pigment content, not even defects if the marking varnish was applied to the pigment-free insulating varnish instead of directly to the copper. It was not until the winding lock was turned that defects arose which, in addition to the influence of the paint composition, also showed an influence of the substrate in the case of paints D, E and K. Especially with D the completely unexpected improvement in stretchability through the insulating varnish A underneath is noticeable * Where cracks or many cracks were found on copper, the abundantly pigmented marking layer on the insulating varnish showed almost no defects or only pores. In experiment K, there was a considerable difference in the stretchability of the curl a, and again, completely contrary to the rules, the pigment-free insulating varnish had a favorable effect on the stretchability of the pigmented varnish above it.

The breakdown voltages are particularly interesting. All marking lacquers showed higher breakdown voltages aiii directly on the metal - the conductor - on the insulating lacquer base. The values (breakdown voltage 1a and 1b), which were converted to a layer thickness of 1 mm to facilitate the comparison, differed many times over, except for Gr. The "gain in volts" is surprisingly high and in most cases is over 1000 V _e

label III with the markings of the lower pigment content basically shows the same picture as table II: good mechanical properties and a surprising one Gain in breakdown voltage when the marking laoke points to a wire lens instead of the

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Conductor metal were applied. Babei did not play the type of binder - if it only dries elastically in the oven - nor the type of pigment decisive role. With the low pigment content of only about 8% by volume in the marking layers, that is The result of the two curl tests is significantly better than in Table II. The covering power of the varnish R leaves something to be desired, so you should go with that Applied not very opaque white pigment the limit of 7 $ pigment of the dried paint layer not fall below.

That one with an additional Sehlußlackierung with Transparent lacquers come to other interesting results, is shown in Table IV.

The breakdown voltage of the (white) opaque pigmented marking lacquers were significantly greater when they were up an insulating varnish, i.e. applied to an enamelled wire instead of directly to the untreated wire. (Compare experiment Tl and TJ) If the marked enamelled wires (Insulating varnish as the substrate) were now covered with a transparent varnish, the results under T and V values represented. At T a soluble dye was added to the transparent varnish (T2), at V the transparent varnish Vl was through. Dispersion of a small amount of an organic dye, translucent colored. The clear varnish improved the stretchability, and it was again achieved in both cases a gain in breakdown voltage »This one had a gain in the order: opaque marking varnish on transparent Insulating varnish the same order of magnitude as the '

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Order: transparent varnish on marking varnish. The sum the profits were considerable »

A transparent lacquer as the top layer is not only mechanically and electrically interesting, but also visually. If it is stained, the color tones are on a white ground, as was in the case T and U _t particularly brilliant *

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Tab hurry ί

1865452

Amount of pigment 26 vol. # TiO ₂ m / min ρ 26 VoI-96 TiO ₂ 400 25 yol-fo TiO ₂ Maximum temperature ⁰ O 400 (Ou)
(20 / um)
(2H) m / min 400 Take-off speed
age 3.8 ( Well ) 2.0 (Ou)
(20 / um)
(Η ·) 2.6 m / min. Layer thickness
Pencil hardness 22 / um (Well ) 20 / um ( Well ) (Ou)
20 / um (25 / um)
- (3H) Twist Well (dto) Well (Well ) good Good ) $ 25 stretch Well (dto) Well (dto) good Good ) Winding lock a Cracks Cracks (dto) Cracks (dto) Winding lock b Cracks Cracks Cracks (dto)

A Blechlacki Ortho-phthalate with 35 f ° drying fatty acids B paint for exterior coating: Ortho-phthalate with 68 ° / o linseed

fatty acid

C Sheet metal paint: Lean epoxy resin fatty acid ester.

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■ table III

Pigment amount

Hochsttenpe-
rature ⁰ C j

Take-off speed

Layer thickness

Pencil hardness'

! Twist

$ 25 stretch

Winding lock a

Winding lock b

Breakdown voltage 1

Breakdown gas voltage 1 a

Gain in volts

Breakdown voltage Ib

-; » p7
. 400

2.6 n / ain

(Cu)
15 / um (10 / uti ')

- (2H) good (good) good (good) good (good) good (from cracks)

55OOV (630V)

(63 kV) 1100

137kV

8.5 'VoI-I p8 400'

2.6 m / iain (Cu)

well well well Well

(2H) (goodJ (good) (good) (Well)

> 6000V (1200V) (69 kV)

> 145 kV

j 8.5 VoI -; -; p4 380

2.5 n / oin (Cu) 12.5, vm {20, vii)

- (H) good. (good) good, (good) good (good) w. pores (dto),

5420V (8XV)

(4OkV) 1470 ■

157 kV

0 « 8.5 VoI-; pGa 6.5 vol- ¹ ; p4 7 VoI- /, p4 _S 8), 9 VoI-; p9 400 400 400 8.3 vol-; _P -.a 400 3 i 5a / nin 3, 6n / iain 3 m / min. 400 4 m / in (Cu) (CU) (Ou) 8 m / min (Cu) 5 / un (17yua) 17 * 5 ^ (17.5 ^) 30yum (20 / um) (Cu) 20 / un (20 / um) - (6H) - (4 H) - (2 H -) 15yuia (7.5 / un - (3K) good Good) good Good) good Good) - (3H) good Good) good Good) good Good) good Good) (good Good),. good Good) Pores (dto) w.pores (dto) almost good
(Cracks)
almost good
(dto) good Good) Pores (dto) * oren (dto) good (almost good) 593OV (112OV) good Good) Pores (dto) 560OV (69OV) > 6000V (112QV) ';.
¹ (56kV) good Good) > 60O0V (93OV) (4OkV) (67kV) 800 V > 60 ^ 0V (425V) (46kV) 1460 BC > 1370 V 82 kV (57kV) > 1600 V 143 kV 145 kV - ? 2125 BC 127 kV > 170 kV
\

τ = a lot / w = little

! Γ -a b e 1 1 e II

Exgment amount Hochs ttenperagur

Withdrawal speed

Layer thickness O lead hardness (O twist

OO ^! _ < ^: 25 5 »elongation

■ P-curling lock a O curl b.

, ^^ Punch. ^^^ tension 1a

- * "Punch 7 1a

Gain in volts

Through chlags voltage 1b

26 vol-jS pi 400

2.0 m / min. (Cu) 10 / µm (15 / µm)

- (2H) good (good) good (good) almost good (Hisse) Pores (w.Hisse)

5400V (800 V)

(53 kV) 1420

, 195 kV

18 VoI-Ji p2

19th

400 j

2.6 m / min. j, 2 ·, 6 m / nin.

(Cu) 10 / µm (20 / µm)

- (° 2H) good (good) good (good) good (w.Hisse) good (with cracks)

? SjOOV (llOOV)

(55 kV)

> 2Q00

> 255 kV

25 / um (25 _{/ u} u) - (H)

good (guu ^! )

good ■ (good) w.pores (dtö) vi.I'oren (dto)

> 6OOOV (1O2OV)

(41kV) M 530 '

> 100 kV

β ') 2> 0 V 19 V01 - S p5 1270 V _τ 5) +) 950 V _K 6) 20 VoI- <i p4 81 kV 400 105 ,. kV 19 VoI- ^ S p6 153 kV 16 VoI- ^ p5 . 350 4 n / min. 400 400 2.0 rn / min. (Cu) 3.5 n / min. 4.6 m / min. (Cu) 20 / um (20 / um)
- (, 3H) (Gu) (Cu) ' 25 / um (20 / um)
" (H) Well . (Well) 15 / um (20 / um),
- (6H) 17, SyUm (17, 5 / Ue)
- (4H) good Good) good Good) good Good ) good Good) good Good) v. Hisse (dto) good Good ) good Good) good Good) v. Cracks (dto) Pores (dto) almost good (by Poien) - 5500 V (830V) Pores (dto) Pores and cracks (dto) 5480 V (1430V) ■. (41 kV) 4 ?? 0 V (1800V) 6000 V (970 V) (71 kV) (90 kV) ■:. (55 kV) \ 1580 V ■ <
' 145 kV —A
σ)
cn
—_ cn

Ϊ1 1170V T a b e lie IY 1 TJ 4) ■ Y · ■ - 170 kV . . Vl. . . TJ + Vl 10 VoI- # p5 12th 19 vol- $ p4 Tl +! D 2 0.7 VoI- ^ pi 1 Amount of pigment 400 dye ι 400, 5, 5 m / min solved p10 3 m / min. i 400 Hb "ciist temperature (Ou), 320 (Ou) 4 m / ain. Abzuggesehwindigk.sit 10 / in '(18 / um) Il - Il. 15 / um (20
' / Uffl) (Ou) 10 / 3Bt TJ +
12 / at Yl (4H); (Ou) - '(4H) (15 / um) - S'ohiohtaioke good Good)' (20 / um 10 yum Il
13 / at 12 good Good) (4H), Well Eleistif harder ". ' good Good) (4 η; , ■ good Good) (Well) Well. οIwists. Cracks (dto) (Well) Well Pores - ; (Well) almost good cd 2 5 1 °. strain w. pores (dto) ' (Well) Well Pores (dto) (Pores) Well ^ Curling a 2450 V (960 V) (Well) almost good 3630V (85.0V) (Pores) .55QQ V ■ ^ Viickellocke Td, (53kV) (Well) Well (42 kV) (620 Y) ο breakdown voltage 1 (2800 Y) 5300 Y 2060 Y (41 kV) 1580 Y; u> by chs chs chlags voltage la (HO kV) 180 kV "° gain in volts . 1030 V Breakdown voltage Ib

w = little

Footnotes to Tables I - IV Binders t

1.) Epoxy resin with epoxy equivalent weight of 900, produced in a known manner from epichlorohydrin and 2,2 ~ bis (4-hydroxyphenyl) propane and with 55 i ° linseed oil fatty acid, based on the esterified resin, esterified in a known manner; Sikkativi 0 , 3 $ Pb, 0.035 $ Mn, 0.013 ^G / ° Co, added as naphthenate; solvent:. ethoxyethanol 5 i * xylene.

2,) As 1), but esterified with 35 $ fatty acid; Desiccative: $ 0.035> Ce, added as octoate; Solvent: each 20 ° / o of solvent naphtha and ethoxyethyl acetate, 60 fo entkampfertes turpentine.

3 ·) Orthophthalate resin with a content of 39 ° ß>

isomerized linseed oil fatty acid; Solvent: per 22 high-boiling aromatics and tetrahydronaphthalene, 10 fo ethoxyethyl, 46 ° / o entkampfertes turpentine.

4o) .Hit adipic acid polyester plasticized urea resin ("Plastopal AT"); Solvent: 60 fo butanol, 40 fo ethoxyethanol ο

5o) precondensate, hergestej.lt in a known manner from 30 fo butylated urea-formaldehyde resin and 70 io of an epoxy resin, corresponding to 1), but with an epoxy equivalent weight of 1800;

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Solvent: 75 $ ethoxyethanol, 25 $ xylene.

6,) mixture of 8 parts of a terephthalic acid polyester alcohol ("Desmophen 1025") and 5 parts of heat-reactive aromatic isocyanate with 3 isocyanate groups ("Desmodur GT stable"); Solvent: 44 per i> xylene and Methoxyäthylacetat, 12 <fo butanol.

7) mixture of 50 $ drying Orthophthalatharz (with% io-drying fatty acid), 35 ° non-drying 1 O ^ thophthalatharz (23 ° f coconut oil fatty acid), 15 ^a / o melamine resin;! Solvent: 10 each fo mineral spirits around Te tr ahydr onaphthalin, each 23 i> entkampfertes turpentine oil and butanol, 30 io high-boiling aromatics, 4 io ethoxyethyl.

8o) Gremisch of: 15 i ° soluble polyamide ( "Ultramid TO") "25 io poly there ter alcohol (" Desmophen 600 "), 50 i * heat-.reaktivem aromatic triisocyanate (" Desmodur AP "), 10 io melamine resin; Solvent: equal parts of cresol and solvent naphtha with 6 io butanol.

9 ·) mixture of: aliphatic TJrethangruppen containing polyester alcohol and in the cold-reacting aromatic isocyanate having three isocyanate groups ( "Desmodur L") j solvent: each 18 io ethoxyethyl acetate and butyl acetate, 24 io cresol, 40 $ xylene.

Pigment: -

pl): 13 VoI. -io anatase TiO ₂ ; 13 VoI. - $ Cd selenide "p2> i iron oxide red" KR 86 » _o ·

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p3) ϊ chromium oxide green.

p4) ί HUtIl-TiO ₂ .

p5): Zn-SuIfid ("Sachtolite").

p5a): Zn-SuIfid ("Sachtolite"), in addition in a dissolved state (based on the non-volatile binder) 0.8% by weight Sudan red BB and 0.4% by weight Sudan brown R,

p6): 9 vol .- ^ anatase Ti8 ₂ ; 10 vol .- $ iron oxide yellow.

p6a): 4 vol .- $ anatase TiO ₂ ; 4.5 vol .- $ iron oxide yellow.

p7): 5% by volume of anatase TiO ₂ ; 3 vol. -5 ^ permanent yellow UCG.

p8): 5 vol .- $ "Heliofast black TW powder 100: 130" j

3.5 vol .- ^ I-micromicra 5 / um. P9): 7.5 Vol .- $ Zn-Sulphid ("Saehtolite"), x 1.4

H'eliobordeaux BLG; 0.1 vol, - / »Heliogen blue B p10): 1.5% by weight of 9S Sudan red BB dissolved, based on the

non-volatile binders. pH): Permanent yellow ITCG.

Remarks;

+) The wire to which the yellow lacquer was applied had a diameter of only 0.4 mm and was with P insulated with a wire enamel of 20 μm layer thickness.

The breakdown voltage averaged 2650 V and was polished according to DIN regulations with a Cylinders 3 cm in diameter measured at a tensile stress of 250 g. An oven was used for drying 1.25 m long.

x) The conductor had a diameter of 0.6 mm and was more moderate with a 12.5 μm thick layer of a wire enamel pigmented ^{with a glaze with a 1 YoI, - c} / o (based on the dried layer)

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Quality insulated · The binder consisted of a G-emic that reacts in the warmth Polyamide, Polyester Alcohol and Polyisocyanate «The breakdown voltage was 750 Y for a Layer thickness of 12.5 / µm, measured according to DIN regulations, as stated under +) «

++) The conductor of 1mm diameter was with a 12 / um

thick layer of a polyester imide varnish isolated *.

- The mean breakdown voltage was 930T * ™

00988A / 07 3 7

Claims (12)

Expectations " 1. Wires, especially transmission conductors and from them manufactured multi-core cable, characterized by an insulating sheath with a transparent, preferably pigment-free insulating varnish and a second coating on top of it, which is made elastic in the oven There are drying binders in which white or colored pigments cover the conductive metal are included. 2. wires according to claim 1, characterized in that that a drying alkyd resin is used as the binding agent for the marking paint, with a maximum of $ 40 as an ester bound fatty acids is modified, which consist predominantly or entirely of drying monobasic fatty acids and are preferably isomerized and / or contain conjugated double bonds. 3 «wires according to claim 1, characterized in that in the binder with non-dry monobasic Fatty acids modified alkyd resin is used, which is combined with a melamine and / or urea resin. Ae wires according to claim 1, characterized in that the binding agent is an epoxy resin preferably made from 2,2-bis (4-hydroxyphenyl) propane and epichlorohydrin with an epoxy resin equivalent weight of 500 to 2000, the one with partially or completely drying, monobasic , Fatty acids, which are preferably isomerized and / or contain conjugated double bonds. NCUG Unlerlag3IT (^ rt.J ii Α b &. 2Nr \ 3ψ 3 of the amendment. v. 4. 0. 5. wires according to claim 4, characterized in that the epoxy resin instead of the fatty acids with melamine and / or Urea resins is implemented. 6. wires according to claim 1, characterized in that the binder consists of a mixture of a polyester alcohol and a polyisocyanate that only becomes reactive when exposed to heat. 7. wires according to claim 1, characterized in that the binder made from a mixture of a polyester alcohol, consists of an isocyanate that only becomes reactive when heated and a soluble polyamide. 8. wires according to claim 1, characterized in that the binder is a polyester plasticized Harnet off resin. 9. wires according to claim 1 "to 8, characterized in that that the coating contains zinc sulphide as pigments 10. Wires according to claim 1 to 9, characterized in that the sheath remains soluble in the binder Contains dyes 11. Wires according to claim 1 to 10, characterized in that the second sheath pigment only in those Contains quantities that are necessary to cover the conductor provided with the first covering » 12. Wires according to claim 1 to 11, characterized in that that over the preferably white cover a colorless or transparently colored further cover which is an elastic drying binder with or without the action of atmospheric oxygen in the oven contains. 00 9884/0737