CN85105227A - Make the method for insulated twisted electric wire - Google Patents
Make the method for insulated twisted electric wire Download PDFInfo
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- CN85105227A CN85105227A CN85105227.4A CN85105227A CN85105227A CN 85105227 A CN85105227 A CN 85105227A CN 85105227 A CN85105227 A CN 85105227A CN 85105227 A CN85105227 A CN 85105227A
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Abstract
A kind of manufacturing has the method for thin high-quality insulation strand electric wire.The thickness of insulating sleeve is 3 to 100% of whole group strand conductor minimum circumscribed circle radius.Insulating sleeve adopts twice or repeatedly spreading and a kind of insulating varnish of curing form repeatedly.Recommendation applies the formation of hot curing insulating varnish to the innermost layer of insulating sleeve with insulation applicator or stitching coating instrument.Should adopt viscosity in the time of 30 ℃, to be not more than the hot curing insulating varnish of 300CPS.
Description
The present invention relates to make a kind of method of the insulation strand electric wire that is used on the various electronic equipments.In more detail, relate to use insulating varnish be coated in thinly multiply lead volume surrounding And to cured a kind of method of making insulation strands with multiply conductor.
A kind of insulated electric conductor of most electronic equipments normally covers insulating material by extruding the skin of whole strand conductor.This insulated wire uses separately, or uses as the multiply conductor of shielding wire, coaxial cable or flat cable etc.
Because development recently is small-sized and the electronic equipment of lightness, so all paying the sectional area that very big effort reduces insulated electric conductor, shielding wire and various cables.A kind of method wherein is exactly the thickness that reduces insulating sleeve.But form very thin insulating sleeve with existing extrusion technique, that is very difficult.A kind of like this scheme was once arranged, promptly repeatedly applied the insulating sleeve of obtaining a thin layer with curable insulating paint.But many difficult problems are arranged in practical operation, for example, when applying insulating varnish to the strand conductor and solidify and to have taken place in each step of added lacquer that sheath scabs or accompany bubble in sheath.More particularly, when the insulating varnish on being added to the strand conductor solidifies, remain in the air that respectively twists in the conductor gap, as shown in Figure 1, it expands owing to being heated, and the result causes on jacket surface and scabs.Adopt low temperature-150 ℃ or cure the problem that the lacquer that is applied just can significantly reduce above-mentioned appearance, but the sheath of making at last is hard inadequately, does not manufacture reliable insulation strands with next.
In order to address the above problem, the present invention had once carried out various researchs, wanted to find a kind of effective method manufacturing to have the twisted wire of thin insulating sheath.Now successfully developed a kind of method, it can form on the strand conductor does not have the insulating sleeve that scabs with the noresidue air bubble.
As mentioned above, when with conventional when adding method that insulating varnish solidifies then forming insulating sleeve on the strand conductor, the air expanded by heating regular meeting in the conductor gap causes on sheath scab (seeing 2 among Fig. 1).Because when air is heated under certain pressure, for example from room temperature (20 ℃) to 250 ℃, its volume increases to 1.8 times.
The present invention has fully finished result of study, and the technology that the inventor developed has been eliminated the bubble of wrapping up in into, scabs thereby avoided increase owing to this volume of air to cause on sheath.Formed insulating sleeve is characterized by according to the present invention, and it is thinner than the sheath that forms with conventional extrusion technique, specifically.The thickness of insulating sleeve be whole strand conductor minimum external circle radius 3 to 100% in.If the thickness of sheath is less than 3% of the radius in above-mentioned garden, then can not get insulation strands highly reliably, if the thickness of insulating sleeve is greater than 100% of all radiuses in above-mentioned garden, method then of the present invention does not show any benefit, just with the same with conventional extrusion technique effect.
A kind of method of the present invention is, at least the innermost layer at the insulating sleeve that twists conductor is the thin layer that is formed by heat treated insulating varnish, be covered to complete by insulation applicator or stitching, treat promptly to obtain the insulation strands of no scar on the insulating sleeve after this layer curing.
Other method of the present invention is, at least the innermost layer at the insulating sleeve that twists conductor is the thin layer that is formed by heat treated insulating varnish, the viscosity of this insulating varnish is not more than 300CPS in the time of 30 ℃, treat can obtain the insulation strands of no scar on the insulating sleeve with after this layer curing.
Another kind of method of the present invention is, at first will twist conductor with a kind of solvent and soak entirely, and spreading heat treatment insulating varnish solidifies, so can obtain the insulation strands of no scar on the insulating sleeve then.
Another method of the present invention is, with electrodeposition process electrolysis coated with lacquer solution deposition on the strand conductor, and heating applies insulating varnish more then, after solidifying, promptly obtains the insulation strands of no scar on the insulating sleeve.
Another method of the present invention is to penetrate to handle to coat with lacquer to be applied to the width of cloth and twist on the conductor, again through solidifying, so make the insulation strands of no scar on the insulating sleeve.These five kinds of methods of the present invention have comprised same invention guiding theory, promptly manage to eliminate to solidify the preceding bubble that produces in the insulating barrier that applies.
Fig. 1 is the sectional drawing that has one group of twisted wire of insulating sleeve;
Fig. 2 is the sectional drawing by the insulation strands of the present invention's processing;
Fig. 3 is for forming one group of twisted wire sectional drawing of innermost layer sheath with electro-deposition electrolysis lacquer liquid;
The insulation strands sectional drawing of Fig. 4 for being processed into by a kind of method among the present invention.Wherein, on the strand conductor earlier the solvent-free width of cloth of coating penetrate and continue to solidify after solidified paint solution is coated insulating varnish after with this layer curing again
Fig. 5 is for having the insulation strands sectional drawing of bubble in insulating sleeve, this is not incorporated into the solvent-free width of cloth in advance immediately and penetrates and cause in the solidified paint because twist conductor by vacuum chamber;
Fig. 6 penetrates the viscosity and the temperature relation curve of solidified paint for the solvent-free width of cloth;
Fig. 7 is the paint bath with vacuum chamber, and the view that the one side is elevated is below this vacuum chamber is positioned at, so that make the strand conductor then enter paint bath by vacuum chamber earlier.
To explain orally in detail below of the present invention above-mentioned every.
Adopt at the coated insulating barrier of strand conductor and will twist conductor dbus and cross drawing-die, in the method for going to the paint bath that insulate then, the passage of drawing-die must have the larger hole of diameter, minimum external garden of a comparison conductor. This just causes thick coating unnecessary between conductor, and the evaporation of solvent will be increased in the probability that scabs on the insulating sheath of making in the expansion of each conductor gap Air and the lacquer. In fact, the coating of strand on the conductor scabs and next step twisted wire processing can not be proceeded after the hardening. The size in hole is substantially equal to twist the minimum external garden of conductor group diameter and can forms thinner insulating sheath on the employing drawing-die, but will make drawing-die accelerated wear test, or employing changes the method for the external diameter in external garden along the conductor total length, but between conductor and drawing-die, will cause friction inhomogeneous, so just can not wrap uniform insulating sheath along conductor is elongated.
According to first method of the present invention, be to coat with insulation applicator or stitching to apply the heat treated insulated paint formation of skim at least in the innermost layer of strand conductor insulation sheath; Then this layer is solidified, do not have the insulating sheath that scabs so the insulation strands of making has.
As mentioned above, the heat treatment insulated paint that applies will at first be filled in the gap of respectively twisting conductor. When the lacquer of filling is heated, be clipped between the conductor and lacquer in air namely expand and through on the surface of this layer and occur scabbing. But the test done of the present invention confirms, when only coating the lacquer amount selection that once applies and will make AC≤(AB)/2 (see figure 1) with insulation applicator or stitching, Be easy to before this layer harden fully loss after air between the conductor expands and come out, so the insulating sheath of the no scar of formation.
The thickness of sheath then preferably applies secondary to five as being equivalent to the AB among Fig. 1, and is thicker such as thickness, then will be by the conductor of spreading then with the drawing-die pull in sizeable hole. Use insulation applicator or stitching to coat, when insulated cladding thickness once reaching about 2～4 μ m, namely an available drawing-die is followed spreading. Do like this total degree that has reduced spreading and bake cycle, thereby obtain greatly material benefit of coml.
For for providing thickness to be about the sheath of 20 to 25 μ m on seven strands one group the twisted wire of per share diameter for 0.06mm. If every layer all only coats with insulation applicator or stitching and once forms, then need at least 10～15 spreading circulations. Can not once form thicker covering and along the conductor length direction inhomogeneities not take place with insulation applicator or stitching coating, so must apply as required to the greatest extent repeatedly thin layer in order to obtain desired thickness. But apply many thin layers will be subjected to can installing the drawing-die head in given pot arch restricted number, and apply multilayer and also make productivity losing, this is a serious problem in actual production. So preferably the pair twist conductor applies the insulation enamelled coating that the thin nothing of one deck scabs, the covering of residual thickness is finished by a drawing-die then. Like this, just can effectively produce the desired insulated wire at the no scar of insulating sheath.
When using the insulation applicator in the first method of the present invention, can adopt the material of any conventional usefulness to consist of, for example fine hair, polyester, poly-tetraphenyl ethylene, polypropylene, polyvinylidene chloride and staple fibre, the density of insulant is chosen as from 0.20 to 0.60g/Cm3, it is selected that the shape of drawing-die and material can be pressed the condition of the insulated paint that the enamel-covered wire produced need use. Suitable die material in respect of: the carbide alloy of sintering, the rhinestone of sintering, sapphire, rhinestone and rough diamond ， And and it should be able to provide the thorax hole of the needed suitable shape of drawing-die. Can adopt the used equipment of general manufacturing enamel-covered wire to get final product as for the equipment in the stitching method for coating.
According to second method of the present invention, cure once with insulation applicator or stitching Bao Fu And at least the innermost layer of the insulating sheath on the strand conductor, and employing has viscosity and is not more than 300CPS The heat treatment insulated paint of (when measuring under 30 ℃ with the Brookfied viscosity gauge) then adds And to Shaoshi and solidifies the above integral insulation lacquer of one deck, thereby makes the insulation strands of no scar on the insulating sheath.
Before said that cause the reason that scabs to be, (1) was wrapped with air in the gap of conductor, the evaporation of (2) solvent in insulating varnish.The present invention confirms, adopts the insulation applicator or carries out spreading skim heat treatment insulating varnish with the stitching coating, makes the air in the conductor gap be easy to disperse out, just can eliminate the above-mentioned reason that scabs (1).Through the further research to scabbing, the present invention finds that above-mentioned effect is also relevant mutually with the viscosity of heat treatment insulating varnish, and particularly this nexine is attached to the lacquer on the conductor.So, the thickness of being not only covering that will consider especially for strand conductor formed ground floor, and to consider the viscosity of heat treatment insulating varnish.
Be added to the heat treatment insulating varnish of strand on the conductor when conductor dbus is crossed baking chamber, its viscosity will temporarily descend, and the air that is rolled between conductor expands owing to being heated, and And passes enamelled coating and overflows.Measure the resistance of the viscosity of lacquer to the effusion air.If lacquer is high viscosity, the air of then wrapping up in into will be difficult for overflowing in body.This will increase and form the probability that scabs on the sheath.Even the air of wrapping up in into overflows in the body, and the big lacquer of viscosity all can not given smooth sheath regardless of the surface strength that produces.The present invention is by evidence, and in order to prevent to scab, the viscosity of insulating varnish must be no more than 300CPS(and measure down at 30 ℃ with the Brookfield viscosity gauge).Better scope is below the 200CPS, as is that is just better below the 100CPS.
This low viscous insulating varnish viscosity when hot curing further reduces, and causes the easier effusion of air of expansion.The further evidence of present inventor because air is overflowed the enamel-cover laminar surface the inhomogeneities that may cause be easy to be eliminated by capillary effect, so can obtain the sheath of smooth surface.Explore according to the present invention, to having the thickness of the innermost layer enamel-cover shown in AB among Fig. 1, the hot curing insulating varnish execution that is not more than 300CPS with viscosity once gets final product, and does not have the generation that scabs.
Because be rolled in the conductor gap air when implementing the innermost layer enamel-cover loss come out, so when in succession enamel-cover layer of formation, just can adopt viscosity to be higher than the insulating varnish of 300CPS.Even residual have air in certain amount inside, but be enclosed within the nexine enamel-cover that has solidified, just can not caused scabbing of its second layer, but in order to prevent owing to coat with lacquer the evaporation of liquid and cause and scab, the second layer and enamelled coating in succession should be too not thick, do not use sticking insulating varnish yet.If adopted the insulation applicator, then preferably be that the insulating varnish below the 700CPS is used as the second layer and one deck in succession with viscosity.As use drawing-die, then the viscosity of insulating varnish is preferably used 5000CPS.
Fig. 2 illustrates the cross section with multiple insulating sleeve insulation strands, wherein the second layer and in succession each insulated cladding system by label 6 expressions.In reality processing, must come to determine rightly by desired electric wire character and final jacket thickness to the selection of adopting insulation applicator or drawing-die and applying number of times.
The insulating varnish of any common usefulness all can use as long as suitably adjust viscosity.Certainly, the selection of insulating varnish also is decided by the desired character of insulated wire product.
According to the third method of the present invention, be before applying hot curing insulating varnish, to be dipped into the strand conductor in the solution earlier or to be coated with this solution, be heating and curing then, thereby make the insulation strands of no scar on the insulating sleeve.If it is all strand surface of conductors are all soaked by solution, then after-applied and cure the possibility that heat treatment insulating varnish just can reduce the phenomenon that scabs significantly at it.This third method of the present invention has very big commercial value because make like this insulated wire with produce conventional enamelled wire produced scab similar.Soak every conductor with solution and can reduce the probability that occurs scabbing, its main cause is to have replaced with this solution and is rolled in the shared space of air in the conductor gap, so being squeezed to the outside, goes air, or next step insulating varnish that applies is easy to the residual air that replaces, so that has reduced the probability of air expansion during heating.
Used above-mentioned solution must be that the insulating varnish that applies with its next step is miscible.If insulating varnish is polyvinyl formal, then any polyurethane, polyester or polyester imide, cresylic acid, dimethylbenzene, toluene or naphtha all can be separately or are mixed and be used as solvent.If as the heat insulation insulating varnish of one deck, then available pyrrolidones dilutes it as basic Rong Ji And with dimethylbenzene, toluene or naphtha with polyamides ester imines or polyamides ester.Should select suitable solution by actual conditions.
Be listed in above-mentioned various solution and can individually or mix use, before applying the insulating varnish processing, the strand conductor uses, solvent in they and resin and the lacquer all has well molten and property, can above-mentioned solution be applied up with an insulation applicator, also available in addition stitching coats or conductor is immersed in the solution tank, and then wipes superfluous solution away to maintain uniform liquid layer.
Be retained in any dirt on the conductive surface, metal dust for example, even the surface substantially spreading solution also can cause and scab.For fear of this phenomenon takes place, the pair twist surface of conductors can be used in carries out electrolysis and removes in the water electrolysis liquid, removes spreading solution immediately after then drying up with hot water wash.These programs can guarantee to apply hot curing insulating varnish and once promptly form the sheath that the nothing corresponding to thickness shown in the AB among Fig. 1 scabs.
According to the 4th kind of method of the present invention, be solution to be coated with lacquer in electrolysis be coated on the strand conductor with strike, and then with this layer oven dry.In this law, the air that is clipped in the conductor gap (label 2 among Fig. 3) is overflowed by electrodeposited film, thereby makes the insulation strands of no scar on the sheath.Because electrodeposited film (7 among Fig. 3) has more porousness than other conventional insulation paint films,, and can on sheath, not stay scar so the air of expansion is overflowed rapidly after being heated.When added insulating barrier once heat fused, it promptly blocks the outside loss of air residual between conductor.
Electrolysis lacquer solution generally is divided into water-soluble and looses medium-sized in water.Every kind all is to produce a kind of resin type deposition to be attached to as on the alive substrate, and this layer deposition be porous, so unavoidably contain a certain amount of gas.When subsequently to this porous resin layer heating, it flows and forms very uniform sheath.More particularly, when heating by the formed porous resin layer of electrolytic deposition on the pair twist conductor, air in the gap shown among Fig. 32 expands rapidly and passes this layer resin molding, after dilated air is fled from resin molding, film is heated fusion and flows to every part of conductor, thus, porous part be eliminated and uniformly insulating sleeve promptly be made into.
Molten water type electrolysis lacquer liquid used among the present invention is that base is made with following material, i.e. polyvinyl formal, polyester, Polyurethane, polyacrylate, polyester-imides, polyamide-imides and polyimides.These resinous principle available epoxies or phenolic resins are adjusted, and the molten water electrolysis lacquer liquid that constitutes with the resin of this adjustment also is applicable to the present invention.
Applicablely in the present invention loose in the electrolysis of water type lacquer liquid to be that base forms with following material, promptly to gather
Olefin(e) acid ester (be loose in water type electrolysis lacquer liquid the most generally the main component of usefulness), and polyurethane, polyvinyl formal and polyester.These resinous principle available epoxies or phenolic resins are adjusted, and are serving as that the aproll type electrolysis lacquer liquid that base forms also is applicable to the present invention with this resin.
Electrolysis lacquer solution can be cationic or anionic.For in the cationic situation, contained principal component resin lotus positive electricity must add negative electricity so twist conductor at the electrolytic deposition lacquer.For anionic lacquer liquid, then resin is electronegative, so the strand conductor is to add positive electricity naturally.At least cover shown among Fig. 37 after the partial insulating layer when apply and handle one deck with electro-deposition, below each time spreading and handle in the operation and just can select required insulating varnish suitably by desired thickness that obtains and twisted wire characteristic.Preferably with make in the enamelled wire general insulating varnish, can use too but manufacture the employed insulating varnish of other types electric wire.
As mentioned above, according to the 4th kind of situation of the present invention, the strand conductor at first carries out electro-deposition with electrolysis lacquer solution, then with this deposited film heating, just can use the insulating varnish that any conventional uses afterwards and carry out spreading and sclerosis, the insulation strands of making in this way has not have and scabs and the insulating sleeve of smooth surface.
According to the 5th kind of method of the present invention be, a kind of solvent-free radiation curing lacquer, it can solidify at ambient temperature, when being applied to from level to level on the strand conductor after reaching suitable thickness, with the irradiation of ultraviolet ray or electron beam it is solidified, thus with air entrapment in the space of strand conductor institute boundary.Then, have the insulating sleeve of desired thickness and the twisted wire character of expection in order to make insulation strands, again with the insulating varnish spreading with solidify one deck, this lacquer can to penetrate solidified paint identical with the aforementioned width of cloth, also can be different.According to this 5th kind of opinion of the present invention, can insulating sleeve be scabbed, and can obtain to satisfy the insulation strands of actual motion requirement.The paint film that the solvent-free width of cloth is penetrated solidified paint should cover among Fig. 4 the 8 ， And of the area shown in the hacures and can adopt the insulation applicator or by a drawing-die, or carries out with other general technology.The paint film at 8 places does not require to apply and solidify the width of cloth and penetrates solidified paint and once form in Fig. 4, can be by repeatedly spreading and cure cycle so that the film of desired thickness is provided.
By aforementioned obviously as can be known, adopt arbitrary method in above-mentioned five kinds of methods all can eliminate the problem that causes to scab on the insulating sleeve owing to the air expansion that is rolled in the strand conductor gap.
The present invention also provides the method for the bubble of two kinds of eliminations before the insulating varnish that applies solidifies.In these two kinds of methods, all be to have at least one deck should be applied to ultraviolet ray or electron beam irradiation curing De Qi And curing under irradiation down.According to one of these methods, will cross a heating chamber with the conductor dbus of the such lacquer of one deck, be retained in non-cured layer minute bubbles everywhere so that eliminate those, and then make its curing with ultraviolet ray or electron beam irradiation.Penetrating solidified paint as fruit bat is to be applied on the strand conductor with the insulation applicator or by drawing-die, tiny bubble will appear in the lacquer, by squeezing action between the inner surface of drawing-die and the conductor is that the And that does not eliminate them will stay in this application layer, if with ultraviolet ray or electron beam irradiation, then tiny bubble will remain in the cured layer this layer immediately.Contain the electric property variation that this minute bubbles will make the twisted wire product, so should eliminate.
Fig. 5 is a section of insulation strands, is wrapped with air bubble in its insulating sleeve.Penetrated when solidifying paint bath when the strand conductor soaks the width of cloth continuously, air bubble rises gradually in lacquer, and the source of this air bubble promptly is loaded on the conductor and is contained in air in the lacquer.Adopt the common insulating varnish that cures, when heating, cause bubble in this layer, to expand in baking chamber, again since the viscosity of this moment lacquer descend, so the air bubble that expands sees through enamelled coating and dissipates.If this insulating barrier is continued heating, the air in the conductor gap also passes Peng Zhang And this layer and looses and go to the outside.Its result may some scar on the last insulating sleeve surface, does not stay within it but there is micro-bubble, and on the other hand, the width of cloth is penetrated the time of curing and should be lacked as best one can, as long as air bubble is arrived on the surface of application layer.
In order to address these problems, the present invention applies the width of cloth at the pair twist conductor and deliberately is heated after penetrating solidified paint and lacquer viscosity is dropped to be enough to make air bubble to float on the surface of institute's applied layer.Then use ultraviolet ray again, or the electron beam irradiation, make this layer curing.The result has reached initial purpose.There is not bubble in the insulating sleeve.Make air bubble buoyancy required heating condition should be according to the viscosity and the temperature characterisitic thereof of lacquer to the applying cladding surface for reducing lacquer viscosity, what the speed of the thickness of covering and twisted wire pull etc. were suitable determines.Usually, adopt the long pot arch control temperature of 1～2m in 100～250 ℃ scope, to use.In this case, the temperature of twisted wire preferably remains between 60～150 ℃.If furnace temperature is too high, the air in strand conductor gap will expanded by heating Chu Lai And be stayed on the last sheath and is formed bubble.
If the used width of cloth is penetrated solidified paint, its viscosity and temperature characterisitic have as shown in Figure 6, the increase of viscosity with temperature and reducing suddenly, and then after the surperficial loss of bubble by the enamel-cover layer, it is smooth that this surface becomes very soon.But if the viscosity of lacquer is along with the rising of temperature reduces when being enough to cause smooth covering face, then non-uniform phenomenon will appear in this cladding surface, if used such lacquer, then must do some regulation, to guarantee to provide ganoid sheath, the speed that for example slows down and solidify.The width of cloth that is applied is penetrated the solidified paint number of plies and should be decided on desired jacket thickness.If formed thereafter single spreading cladding thickness is in about 10 to 20 mu m ranges, then any bubble in the lacquer all can coat with lacquer loss in the viscosity decline after heating.
The bubble of eliminating in the heat treatment enamel-cover layer can be undertaken by another kind of method, promptly establishing a vacuum chamber And below paint bath will twist conductor dbus and cross this vacuum chamber, so that all air that will be centered around on the conductor side face are removed, then conductor is introduced paint bath, on the strand conductive surface, forming under the condition that does not have bubble fully so one deck width of cloth is penetrated the solidified paint covering.
One of advantage of this method is not need for heating chamber is set after the application step.The purpose that vacuum chamber is set below paint bath is exactly to twist accompanying air on the conductor in order to eliminate, and the conductor that no air adheres to is introduced in the paint bath, and the number of bubbles that enters in the paint bath reduces along with the subatmospheric degree of the air pressure of vacuum chamber.Air pressure in the vacuum chamber preferably is lower than 150mmHg, under low like this pressure.Bubble contained in the insulated cladding is almost completely eliminated, and makes insulation strands can keep stable electric property.If the air pressure in the vacuum chamber is higher than 150mmHg, then in the end in one deck insulated cladding very little bubble will be arranged.But it should be noted that when the air pressure in the vacuum chamber reduced, the lacquer in the groove just had the possibility that is absorbed in the vacuum chamber.In order to prevent that this lacquer from flowing backwards, an available cushion (for example making of rubber) is placed on the place, composition surface of paint bath and vacuum chamber, simultaneously, the hole that the strand conductor on the paint bath bottom surface penetrates, its diameter should be enough little in order to avoid be out of shape under the siphonage that cushion produces in the air pressure reduction.In addition, when the pressure of vacuum chamber reduced, the probability that the aperture of air by transfer port or bottom land enters in the vacuum chamber rose.This must prevent, for example places to get final product such as the cushion of making of rubber on the end of vacuum chamber.Even the pressure in vacuum chamber when reducing valve rubber the hole diameter of wearing twisted wire will be reduced.If strengthened cushion then comparatively desirable with a following liner plate.Like this, the liner plate siphon that will be enough to bear when vacuum chamber vacuumizes and be produced.Certainly, the aperture under the reinforcement liner plate at the strand conductor place of passing should have minimum diameter.
The strand conductor is long more through the distance of vacuum chamber, and then the air of removing from conductor surface is just many more.It is promptly enough that the length of the evidence vacuum chamber that the present invention did is about 5～10Cm.
Insulation strands section shown in Figure 5 is not for forming with the paint bath institute pull of vacuum chamber through one.Label 1 expression sub-thread conductor among Fig. 5, the 2nd, the gap between conductor, 8 serve as reasons applies and solidifies the solvent-free width of cloth and penetrate and solidify formed insulating sleeve, and the 9th, one deck insulation outsourcing, and 10 be bubbles of vacuum.Fig. 5 explanation, the width of cloth is penetrated in the solidified paint covering and may be accompanied small air bubble under the no vacuum chamber situation under paint bath.
A vacuum chamber 15 is equipped with in Fig. 7 explanation below paint bath 14.As shown, one group of strand conductor 11 was guided to this vacuum chamber earlier before penetrating paint bath.But the inside nationality pump 17 of vacuum chamber 15 vacuumizes, and room pressure is reduced to below the 150mmHg.The top and bottom of vacuum chamber is respectively with pad 18 sealings, and the bottom of cell adopts liner plate 16 to strengthen.Because this strand conductor that makes preferentially passed through vacuum chamber before entering paint bath, so that the number of bubbles that enters into paint bath reduces significantly, and do not have bubble to remain in the width of cloth basically to penetrate in the covering of solidified paint.
Realize that insulating varnish that the present invention can use and the base stock that can solidify are exemplified below: polyester acrylic, acrylic polyol, urethanes-acrylate, epoxy resin and acrylic ester, poly-silica-acrylate, polybutadiene-acrylate, melamine-acrylate, polyenoid/polythiol and undersaturated polyester under ultraviolet ray or electron beam irradiation.These polymer can separately or mix formation insulating varnish, and the material of listing above must be mixed with light-sensitive material when as the ultraviolet radiation solidified paint.Any common light-sensitive material all can be used, and comprises the benzoin alkylether class.For example benzoin ethylether and benzoin n-butyl ether.Acetophenone derivative is diethoxy acetophenone and the eleventh of the twelve Earthly Branches glue ester for example.
9 indication insulated claddings among label 6 among Fig. 2 and Fig. 4, Fig. 5 can serve as basic formation, i.e. polyethylene alkyd formaldehyde, polyurethane, polyester, polyester-imides, polyamides ester-acid imide and polyamides ester with following raw material for example with general insulating varnish; Heat is melted type insulating varnish; And the width of cloth penetrate solidified paint can, these the lacquer classes can be used alone or as a mixture.
The strand conductor that applies the skim insulating sleeve according to the present invention can constitute with various common electric conducting materials; For example copper, copper alloy, zinc-plated copper and plating are with copper that can soldering.In Fig. 1 to 5 seven conductor strands examples together.In fact it is the amount doesn't matter to twist number of conductors, with method of the present invention to the size of metal strand conductor also without limits.
Below enforcement and contrast reference example be in order to further specify method required for protection, and should not become restriction to protection range.
Reference example 1
It is that basic insulating varnish (viscosity is 4000CPS, and concentration is 40%) is done covering that one group seven strands strand conductors (diameter 0.06mm) adopt with the Polyurethane, is to carry out ， And with drawing-die curing under 300 ℃ behind the spreading, and linear speed is 2m/min.Spreading and bake cycle are carried out 5 times.The result has 3 to 10 scars on the long insulating sleeve of average every rice noodles.The characteristic of this insulation strands is shown in Table 1.
Reference example 2
It is that basic insulating varnish (viscosity is 3500CPS, and concentration is 40%) is done covering that one group of seven strand insulation strand copper conductor (diameter 0.05mm) adopts with the polyester, is to carry out ， And with drawing-die curing under 320 ℃ behind the coating, and linear speed is 20m/min.Spreading and bake cycle are carried out 8 times.On the insulating sleeve of the every rice noodles length of result 2 to 7 scars are arranged.The characteristic of this insulated wire is shown in Table 1.
Reference example 3
It is insulating varnish (8/2 the positive alkyl-2-Pyrrolidone/naphtha mixed solvent of base that one group seven strands strand copper conductors (diameter 0.10mm) adopt polyamide-imides, viscosity is 4200CPS, concentration is 25%) do covering, system adopts drawing-die And curing under 320 ℃ behind the coating, and linear speed is 18m/min.Spreading and bake cycle are carried out 6 times.The long insulating sleeve of the average every rice noodles of result has 30 to 70 scars, and the characteristic of this insulated wire is shown in Table 1.
Reference example 4
Process by reference example 3 is carried out, and is immersed in the xylene solution earlier but twist conductor, and then is the insulating varnish spreading of base with polyamide-imides.On the insulating sleeve of the average every rice noodles length of result 20 to 70 scars are arranged, the characteristic of this insulated wire is shown in Table 1.
Reference example 5
One group of seven strands of tin-coated coppers strand conductor (diameter 0.127mm) adopts the solvent-free width of cloth to penetrate solidified paint, and (viscosity is 3500CPS, 30 ℃) do covering, system carries out with drawing-die, the composition of lacquer is that the propionyl acid oligomer of the Japanese Toagosei of one kind of Aronik6100(chemical company closes ester) and sensitising agent (Sundray 1000 of Japanese Mitsubishi (Mitsubishi) petrochemistry Co., Ltd) spreading of 1.5% weight after solidify with the irradiation of 3KW vitalight lamp, linear speed is 20m/min, and spreading and cure cycle are carried out 4 times.On the insulating sleeve of the every rice noodles length of result 3 to 20 microbubbles (the about 10 μ m of diameter) are arranged.The feature of this insulated wire is shown in table 2.
Reference example 6
One group of strand copper conductor (diameter is 0.127mm) adopts the solvent-free width of cloth to penetrate solidified paint (viscosity is 5200CPS, 30 ℃) and does covering, is to carry out with drawing-die.Used lacquer is that the propionyl acid oligomer of VR-90(Japan Showa high polymer Co., Ltd closes ester) be that the electron beam of 7Mrad shines in the inflated with nitrogen body behind 1: 1 the mixed solvent spreading with accumulated dose.Linear speed is 20m/min.Spreading and cure cycle are carried out 4 times.Include 10 to 30 microvesicles (the about 10 μ m of diameter) on the insulating sleeve of the every rice noodles length of result, the feature of this insulated wire is shown in table 2.
Reference example 7
Press the method for reference example 6, but the vacuum chamber of strand conductor elder generation's process 300mmHg pressure before guiding to paint bath.Contain 5 to 20 microvesicles (diameter is about 10 μ m) on the insulating sleeve of the every rice noodles length of result.The characteristic of this insulated wire is shown in table 2.
Embodiment 1
Press the method for reference example 1, but be that the three first layers of insulating varnish (viscosity the is 90CPS) spreading of base is carried out with the speed of 25m/min with the applicator that insulate with polyurethane.Stoving temperature is 300 ℃.The insulating sleeve of insulation strands does not have scar as a result, and outward appearance is fine.The characteristic of this insulated wire is shown in table 1.
Press the method for reference example 2, but with the polyester is that preceding two-layer that basic insulating varnish (viscosity is 240CPS) is done coats with stitching, and speed is 25m/min, and stoving temperature is 320 ℃, the insulation strands sheath of making does not have scar and outward appearance is fine, and the characteristic of this insulated wire is shown in table 1.
Method by reference example 3 is carried out, but earlier the strand conductor is immersed in the pyrrolidone solution, and then to be coated with the polyamide-imides be the insulating varnish of base.The insulation strands sheath of making does not have scar, and outward appearance is fine, and the characteristic of this insulated wire is shown in table 1.
Method by reference example 3 is carried out, but be that the direct current of lacquer liquid (concentration is 25%) 7V of the water mixing of base is twisting electro-deposition on the conductor earlier with anionic acrylic acid, after water cleans, conductor dbus is crossed 320 ℃ baking chamber, and then spreading polyamide-imides Jue Yuan Qi And makes cured as reference example 3 samples on conductor.The insulation strands sheath of making does not have scar.The characteristic of this insulated wire is shown in table 1.
Method by reference example 1 is carried out, but insulated electric conductor is coated with earlier with the solvent-free width of cloth and penetrates solidified paint (composition and reference example 5 are together), carry out with the insulation applicator, make this layer curing with 3KW ultra-violet lamp rayed subsequently, linear speed is 20m/min, spreading and cure cycle 2 times, and then be the insulating varnish of base by shown in the reference example 1 conductor being coated with polyurethane, the insulation strands sheath of making does not have scar and outward appearance is fine.The characteristic of this insulation strands is shown in table 1.
Method by reference example 2 is carried out, but earlier penetrate solidified paint (composition see reference example 6) with the solvent-free width of cloth on the applicator spreading that insulate, in nitrogen, be that the electron beam of 7Mrad shines this layer and makes it to solidify with dosage, pull wire speed is 20m/min, only carry out spreading, cure cycle once, and then on conductor by reference example 2 described spreadings with the polyester be the base insulating varnish, the insulated conductor sheath of making does not have scar and outward appearance is fine.This insulated wire characteristic is shown in table 1.
Embodiment 7
Method by reference example 5 is carried out, but the conductor dbus of earlier spreading being penetrated solidified paint with the solvent-free width of cloth is crossed heating chamber (230 ℃, 1.5m is long), and then makes it to solidify with ultraviolet irradiation, does not have minute bubbles on the insulating sleeve as a result.The characteristic of this insulation strands is shown in table 2.
Method by reference example 6 is carried out, but earlier the conductor dbus that spreading is penetrated solidified paint with the solvent-free width of cloth is crossed hot room (240 ℃, 1.5m is long), and then shines in nitrogen with electron beam and to make it curing, the insulating sleeve of making is without any minute bubbles, and the characteristic of this insulation strands is shown in table 2.
Method by reference example 5 is carried out, but the strand conductor passed through vacuum chamber (80mmHg) earlier before being incorporated into paint bath, because there is not bubble to enter paint bath, so the solid-state insulating sleeve of making does not have bubble.The characteristic of this insulated conductor is shown in table 2.
Method by reference example 6 is carried out, but the strand conductor passed through vacuum chamber (100mmHg) earlier before being incorporated into paint bath, because there is not bubble to enter paint bath, so the solid-state insulating sleeve of making does not have bubble.The characteristic of this insulation strands is shown in table 2.
In example 3, the strand conductor dbus is crossed the full-bodied insulating varnish of drawing-die spreading at reference example 1, and it has numerous air-bubble in insulating sleeve as a result.Then the innermost layer insulated cladding being applied low viscosity (90CPS) hot curing varnish with the insulation applicator in example 1 forms.The innermost layer insulating barrier is the hot curing varnish formation that coats low viscosity (240CPS) with stitching in embodiment 2.So in the insulating sleeve made from the method for embodiment 1 and example 2, do not have scar.
In reference example 4, polyamide-imides insulating varnish is that to soak the xylene solution that is insoluble in this insulating varnish at conductor after-applied, so the insulating sleeve of making has bubble.In embodiment 3, because positive alkyl-2-Pyrrolidone solution that conductor soaks too high dissolubility earlier spreading polyamide-imides lacquer then, so no scar.
In embodiment 4, polyamide-imides is that the insulating varnish of base is after-applied with curing on the strand conductor by electro-deposition at the electrolysis lacquer of molten water, so there is not scar on insulating sleeve.
In embodiment 5, the strand conductor be after having applied the ultraviolet irradiation solidified paint and having solidified again spreading be the insulating varnish of base with polyurethane.In example 6, the strand conductor is that spreading is the insulating varnish of base with the polyester having applied after the lacquer that solidifies under the electron beam irradiation solidifies again.So use- case 5 and 6 formed insulating sleeves do not have scar.
In reference example 5 and 6, wherein being added to strand on the conductor is respectively to solidify De Qi And and solidify in succession with ultraviolet ray or electron beam irradiation, so the insulating sleeve of making does not have scar; But numerous air-bubble is arranged.
In embodiment 7 and 8, be covered with strand conductor that the width of cloth penetrates solidified paint earlier by heating chamber and then be cured processing, because the bubble of all in the covering is eliminated in heating chamber, so do not have bubble in the insulating sleeve of making at last.
In reference example 7, earlier by vacuum chamber, the air pressure of vacuum chamber is 300mmHg to conductor before guiding to paint bath, that is air pressure is higher than 150mmHg, the preferred values that the latter recommends for the present invention.So contain considerable bubble in the insulating sleeve that solidifies, although do not resemble so much that reference example 6 makes.In example 9 and 10, the pressure of vacuum chamber is respectively 30mmHg and 50mmHg, is markedly inferior to preferred values 150mmHg.So with the insulating sleeve that these the two kinds illustrative methods of enforcement are made, bubble is eliminated fully.
The explanation of label in the Figure of description
Label declaration
1 consists of the sub-thread strand conductor of twisted wire
2 gaps
3 coatings
4 surround the minimum external garden of strand conductor group
5 innermost layer dielectric films
6 second layers and each layer dielectric film in succession
7 electrodeposited films
8 spreadings and the solvent-free width of cloth of curing are penetrated solidified paint institute
The dielectric film that forms
9 dielectric films
10 bubbles
11 strand conductors
12 membranes
13 coating
14 paint baths
15 vacuum chambers
16 liner plates
17 vacuum pumps
18 sealing gaskets
Claims (10)
1, a kind of method of making insulation strand electric wire, it is characterized by and comprise: the metal strand conductor to multicore provides an insulating sleeve, the thickness of this sheath is to be enclosed in 3 to 100% scopes of radius in minimum external garden of described conductor, this insulating sleeve is to carry out spreading with a kind of insulating varnish to solidify then, circulates like this twice or more times formation.
2, be cured formation then according to the process of claim 1 wherein that the innermost layer of the insulating sleeve on this strand conductor coats a kind of hot curing varnish with insulation applicator or stitching at least.
3, according to claim 1, wherein the innermost layer of the insulating sleeve on this strand conductor is the hot curing insulating varnish spreading of 300CPS when being not more than 30 ℃ with a kind of viscosity and solidify to form at least.
4, according to claim 1, wherein there is a step to be, the innermost layer of the insulating sleeve on this strand conductor should be twisted conductor earlier and soaked with a kind of solution at least, and a kind of hot curing Jue of spreading Yuan Qi And is cured then.
5, according to claim 4, wherein said solvent has the performance that is dissolved in described hot curing varnish preferably.
6, according to the method for claim 1, wherein provide in the step of described insulating sleeve and comprise, with the electro-deposition of the electrolysis of molten water lacquer liquid on described strand conductor, after making it to solidify through heating, spreading and curable insulating paint and form the sheath of multilayer insulation repeatedly again.
7, according to claim 1, wherein provide in the step of described insulating sleeve and comprise, applying a kind of lacquer that under ultraviolet ray or electron beam irradiation, solidifies on this strand conductor, subsequently this layer is solidified, and then apply the sheath that forms multilayer insulation with curable insulating paint repeatedly earlier.
8, according to claim 7, comprise that further a step is, described strand conductor has been applied this strand conductor dbus that the width of cloth penetrates behind the solidified paint has crossed a heating chamber so that the bubble in this applied layer is eliminated, then this conductor is exposed to the sun in ultraviolet ray or electron beam down irradiation this covering is solidified.
9, according to claim 7, comprise that further a step is, to twist conductor dbus earlier and cross vacuum chamber and eliminate the air be attached on this conductive surface, and immediately this conductor will be introduced in the groove that the lacquer that can solidify is housed then and paint, and then shine and make the lacquer curing of being coated with ultraviolet ray or electron beam.
10, according to claim 9, wherein, the air pressure in the described vacuum chamber is lower than 150mmHg.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 85105227 CN1007468B (en) | 1985-07-08 | 1985-07-08 | Process for producing an insulated twisted electric wire |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 85105227 CN1007468B (en) | 1985-07-08 | 1985-07-08 | Process for producing an insulated twisted electric wire |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN85105227A true CN85105227A (en) | 1987-04-08 |
| CN1007468B CN1007468B (en) | 1990-04-04 |
Family
ID=4794340
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 85105227 Expired CN1007468B (en) | 1985-07-08 | 1985-07-08 | Process for producing an insulated twisted electric wire |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1007468B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102610328A (en) * | 2012-02-28 | 2012-07-25 | 无锡友方电工有限公司 | Manufacturing method of polyvinyl acetal enameled NbTi/Cu superconducting wire |
| CN104616835A (en) * | 2015-01-30 | 2015-05-13 | 广州南洋电缆有限公司 | Method for manufacturing trunk wires and cables |
-
1985
- 1985-07-08 CN CN 85105227 patent/CN1007468B/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102610328A (en) * | 2012-02-28 | 2012-07-25 | 无锡友方电工有限公司 | Manufacturing method of polyvinyl acetal enameled NbTi/Cu superconducting wire |
| CN104616835A (en) * | 2015-01-30 | 2015-05-13 | 广州南洋电缆有限公司 | Method for manufacturing trunk wires and cables |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1007468B (en) | 1990-04-04 |
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