A method of obtaining a polyimide insulating film
(57) Abstract:Usage: in electrical engineering, in particular in the manufacture of electrical insulating materials. The essence of the invention: a method of obtaining a polyimide insulating film is loaded into a reaction chamber of a solvent (dimethylformamide or dimethylacetamide) and 4,4-diaminodiphenyl ether, mixing, loading dianhydride pyromellitic acid, stirring, pouring the film, its cyclization and orientation. Dianhydride load in two stages: first, with 18.1 wt. o'clock , the second - 0,225 - of 0.625 wt. hours Between these stages download 0,20 - 3,52 wt. hours of polymethylphenyl siloxane fluid, the mixing is carried out at 15 - 25C. table 1. The invention relates to electrical engineering, mainly to the production technology heat insulating materials.A method of obtaining a polyimide (polypyromellitimide) film, in which first receive Polynicotinate in the solvent of the amide type of pyromellitates of dianhydride and 4,4' -diaminodiphenyl ether, then the solution Polynicotinate cast in the form of a film, which turns into an imide by reaction with circuit cycles the residual high dielectric strength and adhesive properties, and high values of coefficient of friction and roughness impede quality rewind the film into a roll.A method of obtaining a polyimide film in which the polyimide prior to casting type compounds titanium.However, the introduction of a polyimide titanium does not increase its electrical characteristics.The purpose of the invention is to improve the quality of the film by improving its electrical and mechanical characteristics.Using the proposed method to obtain a polyimide film will simplify the technological operations of the tint film and its winding into a roll by reducing roughness and friction coefficient, increasing the slip film on the film and on the metal, which leads to the improvement and preservation of the quality of the finished film. In addition, the proposed method allows to obtain a polyimide film of smaller thickness for use as insulation film capacitors, cables and wires, magnet media, metallized foil and dielectric, as well as in multi-layer insulating materials by improving the electrical characteristics and adhesion properties.Cassagneau amide solvent and 4,4' -diaminodiphenyl ether, mix them, download dianhydride pyromellitic acid, stirred to obtain a viscosity sufficient for processing into a film of the resulting solution Polynicotinate cast film and produce its orientation, and the imidization, characterized in that the solvent used dimethylacetamide or dimethylformamide, dianhydride load in two stages, between these stages of the download is 0.20. . . 3,52 wt. including polymethylphenylsiloxane fluid in the first stage load of 18.1 wt. hours of dianhydride and the second 0,225. . . of 0.625 wt. hours , with stirring after the first stage of loading dianhydride and after loading polymethylphenylsiloxane fluid is carried out at 15. . . 25aboutWith over 50. . . 70 min, and the stirring after the final loading of the dianhydride is carried out until the solution viscosity of 3000. . . 5000 Poises at a temperature of 20. . . 30aboutWith over 50. . . 70 minutesThe invention is carried out as follows.In the reaction capacity load 210 wt. hours of dimethylformamide or dimethylacetamide, and introduce a 17 wt. including 4,4' - diaminodiphenyl ether, stirred at 15aboutC for 60 min, administered to 18.1 wt. CH dianhydride pyromellitic acid and stirred etc who are at 25aboutC for 70 min, enter dianhydride pyromellitic acid number 0,225. . . of 0.625 wt. hours to obtain a solution viscosity of 3000. . . 5000 Poises after stirring at 25aboutC for 65 min, cast film and carry out the imidization with increasing temperature up to 300. . . 350aboutWith simultaneous orientation is carried out by stretching the film in the longitudinal direction.Adhesive properties (adhesive strength) of the obtained film to adhesive compositions based on silicone, epoxy, polyurethane, polyamide, polyester and other compounds is increased by 20. . . 50% , while processing a film by corona discharge or innoplast irradiation at 50. . . 300% . Value of electric strength (APW. ), friction coefficient and roughness of the films shown in the table. (56) U.S. Patent N 4742099, class C 08 K 5/52, 1988.USSR author's certificate
N 329188, class C 08 G 3/10, 1969. A method of OBTAINING a POLYIMIDE INSULATING FILM, wherein in the reaction capacity load amide solvent and 4,4-diaminodiphenyl ether, stirred them, download dianhydride pyromellitic acid, stirred to obtain a viscosity sufficient for processing in the film, from the received RA is o improve the quality of the obtained film by improving its electrical and mechanical characteristics, as the solvent used dimethylacetamide or dimethylformamide, dianhydride load in two stages, between these stages download 0,20 - 3,51 wt. including polymethylphenylsiloxane fluid in the first stage load of 18.1 wt. hours of dianhydride and the second - 0,225 - of 0.625 wt. hours , with stirring after the first stage of loading dianhydride and after loading polymethylphenylsiloxane fluid is carried out at 15 - 25owithin 50 to 70 minutes, and the stirring after the final load dianhydride carried out until the solution viscosity of 300 to 5000 N at 20 - 30oWith over 50 - 70 minutes
FIELD: electrical engineering; insulating materials.
SUBSTANCE: proposed method for manufacturing insulating materials used in insulators and surge limiters, as well as in manufacturing pipelines, bushes, shells, bearings, wiring insulation of cases includes some additional operations; pre-drying, impregnation, and final drying of prepreg are effected in vacuum chamber and arbor is preheated before prepreg rolling up. Electric strength of prepreg produced by this method is 3.7 to 4.5 kV/mm which is much higher than that of known tubular prepregs.
EFFECT: enhanced quality of fabric surface pre-treatment, improved conditions of impregnation process.
FIELD: the invention describes the method for manufacture of a high-voltage insulator with an elongated central solid or hollow body, plastic casing and one or several plastic sheds.
SUBSTANCE: the method consists of several stager: the casing from plastic is obtained by means of casting or extrusion for the solid or hollow body; the sheds are formed from plastic; the plastic of the casing and/or the plastic of the sheds is partially stitched, and whenever necessary, the incompletely stitched plastic of the casing or shed are stitched completely, the shed is fastened on the specified place on the casing, and the obtained blank of the high-voltage insulator is stitched completely. The silicon rubber contains at least two stitching catalysts reacting at various temperatures, or at least two inhibitors suppressing the reacting of connection at various temperatures.
EFFECT: facilitated procedure.
28 cl, 3 dwg
FIELD: manufacture of column-shaped high-voltage bushing insulators.
SUBSTANCE: proposed bushing insulator has symmetrical hollow cylindrical external insulator 1 with lead-through head 2 supported by one of its butt-ends and designed for connection to high-voltage supply. Resting on opposite end of insulator is lead-through base 3 designed for connection to ground potential. Proposed method involves sequential fitting of lead-through base 3, external insulator 1, and lead-through head 2 on drawing frame 5; lead-through base 3 rests in this case on insulating case 6. Lead-through base 3 and lead-through head 2 are tightly fitted to one another through drawing frame 5 that mounts insulating case 6. Clamping member 21 made for shifting in axial direction is installed on flange 22 of lead-through head 2 prior to fitting the latter on drawing frame 5; head flange 22 and clamping member 21 are pressed against one another to produce pre-tensioning force. During next fitting of pre-tensioned lead-through head 2 clamping member 21 is secured on end of drawing frame 5 passed through insulator 1, and then clamping member 21 is taken off head flange 22 to form negative allowance.
EFFECT: enhanced economic efficiency in manufacturing high-voltage bushing insulator.
7 cl, 2 dwg
FIELD: chemical industry; methods and devices for manufacture of the electric plastic insulators.
SUBSTANCE: the invention is pertaining to the field of manufacture of the electric plastic insulators. The device for manufacture of electric plastic insulator contains the mould for manufacture of the insulating screens, which may be installed concentrically around the vertically located core or the hollow core. The mould has the field arranged below in the axial direction and fitting to the core around it or to the hollow core and the arranged above in an axial direction area, which is extending in radial direction with respect to the field arranged below in the axial direction and may be made according to the form of the being produced insulating screen. Between the end of the arranged below area in the axial direction and the upper end of the mould there is at least one injecting channel for injection of the liquid synthetic material under pressure. The method of manufacture of the electric plastic insulator is realized in several steps: a) the mold is installed in the preset axial position; b) form the a sealing coupling between the core and the mould; c)inject the liquid synthetic material under the heightened pressure with respect to the pressure of the environment; d) harden the synthetic material in the mould; e) remove the sealing joint; f) transfer the mould downwards on the preset spacing interval; h)repeat the steps b) - f) up to production of the required number of the insulating screens. The invention ensures the shorten duration of the material molding and curing, that reduces the production time of the insulators.
EFFECT: the invention ensures the shorten duration of the material molding and curing, that reduces the production time of the insulators.
12 cl, 3 dwg
FIELD: electrical engineering.
SUBSTANCE: proposed method for producing spiral skirt 2 for high-voltage insulator 1 allows for manufacture of actually cylindrical backing 3, extruder 10 incorporating extrusion head 11 that governs extrusion direction A, makes use of extruder 10 for extruding insulator skirt 2 and application of the latter onto backing 3 while rotating this backing relative to extrusion head 11. Novelty is that extrusion direction A actually coincides with longitudinal axis of backing 3; the latter is fed through extrusion head 11. Skirt manufactured by this method can be used for high-voltage insulators, high-voltage lightning arresters, or high-voltage cable entries.
EFFECT: ability of producing high-voltage parts having relatively small diameter.
12 cl, 3 dwg
FIELD: electrical engineering; polymeric insulators and their manufacturing process.
SUBSTANCE: proposed composite insulator manufacturing process includes skeleton fixation in winding mechanism that rotates it about longitudinal axis at the same time moving skeleton along its axis, production of profiled band from T-section silicone rubber band by means of extruder, installation of fin in a spaced relation between turns followed by its rolling-on. Skeleton rotating and moving mechanism is inclined relative to extruder through angle equal to that of fin inclination. Fin is thickened at least on one end of base and this end is flattened in the course of rolling to fill up clearance between adjacent turns. Then part obtained is polymerized and wiring hardware is mounted thereon.
EFFECT: facilitated manufacture, improved termination of silicone finning edge.
1 cl, 2 dwg
FIELD: electrical engineering; electrical insulators.
SUBSTANCE: protective shell is manufactured from two parts: a tube (a hose) slid over a rod or a pipe made of electrically insulating material and glued to said rod/pipe, and fins that can be glued over said tube (hose) at any intervals allowing for obtaining any leakage path length.
EFFECT: improvement of reliability and cost-effectiveness of polymer insulators.
FIELD: electrical engineering.
SUBSTANCE: invention relates to electrical engineering, particularly to the method of making high-voltage lead terminals. Channels are made in the electrically conducting element of a lead terminal, providing for access of the impregnating compound to inner layers of electric insulating material, and on the end sections, flanges are attached, which boarder the area where electric insulating material is put. After winding electric insulating material, the lead terminal is thermally processed and put into an elastic sealed sheath, on which nipple passages to its inner cavity are put, uniformly distributed along the sheath. The lead terminal is then put into an impregnating chamber, thereby joining channels in the electrically conducting element and the nipple passages with the vacuum-pressure impregnating system. Further impregnation and insulation are done at high pressure of neutral liquid in the impregnating chamber and the compound inside channels in the electrically conducting element. The neutral liquid is heated and the lead terminal is baked.
EFFECT: increased reliability and service life of lead terminals.
10 cl, 2 dwg
FIELD: electric engineering.
SUBSTANCE: invention is related to bushing insulator for supply of electric current and/or voltage. Bushing insulator (1) for supply of electric current and/or voltage via grounded plate (2), comprising axisymmetric insulating bushing (3), which surrounds central electric conductor (4). Bushing insulator has sealing part (5) for gas/liquid sealing between conductor and insulating bushing, which represents insulating paper impregnated with resin. Insulator is equipped with compressing sealing element (6), which serves as gas/liquid sealing between conductor and insulating bushing and combined with insulating bushing. Method for manufacturing of bushing insulator comprises impregnation of insulating bushing with hardening material and giving monolith shape in process of hardening with shrinkage. Sealing part is placed on part of conductor axial conductor length between insulating bushing and conductor prior to winding of insulating material.
EFFECT: invention gives possibility to avoid concentration of mechanical stresses at external edge of insulating bushing.
29 cl, 6 dwg
FIELD: electric engineering.
SUBSTANCE: device for reinforcement of suspended insulators comprises carcass with mechanism of insulators feed to working positions of rotary table installed on carcass, pressing devices with shoes coaxial to stems of working positions, interacting with vibrating sector, fixed frame with guide block installed on carcass, and also comprises horizontal platform hingedly fixed on frame with working guide block rigidly fixed on it, on horizontal platform, which is spring-loaded versus frame, there is a vibrator arranged, shoe of pressing device is equipped with pressing rubber piece having ledges that contact with insulator ribs.
EFFECT: increased applied forces of vibration and improved mechanical strength of finished insulators, reliable connection of insulator elements, sufficient seal of cement-sand adhesion and removal of air from it.
2 cl, 3 dwg
FIELD: electrical engineering; insulating materials for wires or commutators of electrical machines.
SUBSTANCE: proposed mica base insulating material has mica paper layer, backing of inorganic fiber (glass or basalt), and binders, such as betulinic and adipic acids having molecular mass of 10 000 to 15 000. Such binders of desired molecular mass can be easily produced.
EFFECT: enhanced mechanical strength, heat resistance, and flexibility; facilitated manufacture.
1 cl, 2 tbl, 11 ex
FIELD: electrical engineering; impregnating compounds for paper insulation of power cables.
SUBSTANCE: proposed impregnating compound has 73 - 77 mass percent of petroleum oil and 23 - 27 mass percent of thickening agent; used as the latter is product of thermal copolymerization of C8 - C9 fraction of liquid hydrocarbon pyrolysis. This impregnated compound is characterized in high rheological(viscous) characteristics and high insulating properties retained upon aging in catalyst (copper) environment.
EFFECT: facilitated manufacture, enhanced insulating properties as well as oxidation and aging resistance.
3 cl, 3 tbl
FIELD: electrical engineering; insulating materials for coating enameled wires.
SUBSTANCE: high-temperature surface-active materials used for the purpose are n-tertiary-butyl-phenol-formaldehyde resins. Condensation polymer (polyester, polyester-isocyanurate, polyester-imide, and polyester-amide-isocyanurate) is first synthesized and then dissolved in adequate solvent or set of solvents. Then n-tertiary-butyl-phenol-formaldehyde resins(dropping point 60 - 85 °C) are introduced in prepared varnish in the form of 50% tricresol solutions at temperature of 40 - 60 °C in the amount of 0.5 - 1% and mixed up for 3 - 4 h. Qualitative and quantitative composition of proposed insulating varnish is given in invention specification.
EFFECT: improved spreadability and stability of rheological, physical, and mechanical properties of proposed varnish.
5 cl, 1 tbl, 15 ex
FIELD: polymer materials.
SUBSTANCE: insulating varnish for coating enameled wires contains polyesteramide resin cresol solvent, petroleum solvent, and tetrabutoxytitanium, said cresol solvent being the one recovered by treatment coal oil and consisting of phenol, o-, m-, and p-cresols, and xylenols, which has following fraction composition (by volume): up to 180°C not more than 3%, 190-205°C at least 70% and up to 210°C at least 85%.
EFFECT: lowered cost price of varnish and improved quality of finished product.
1 tbl, 9 ex
FIELD: polymer materials.
SUBSTANCE: insulating varnish for coating enameled wires contains polyester resin, titanium catalyst, and organic solvents, titanium catalyst being, in particular, tetrabutoxytitanium and organic solvents being petroleum solvent and cresol solvent recovered by treatment coal oil and consisting of phenol, o-, m-, and p-cresols, and xylenols, which has following fraction composition (by volume): up to 180°C not more than 3%, 190-205°C at least 70% and up to 210°C at least 85%.
EFFECT: lowered cost price of varnish and improved quality of finished product.
1 tbl, 9 ex
FIELD: insulation materials.
SUBSTANCE: invention relates to electroinsulation materials for electric machine windings and aims at creating electroinsulation material possessing high heat resistance (155-180°C), high electrical and mechanical strengths, environmental safety, and which would retain its flexibility over a long storage period. Electroinsulation material according to invention contains mica paper layer, one or two substrate made of glass fabric or from glass fabric and polyester or polyimide film, and binder based on unsaturated nitrogen-containing polyester prepared by condensation of maleic anhydride and polyatomic acids with N-(β-hydroxyethyl)-1,2-amidophthalic acid, N-(β-hydroxyethyl)-1,2-amidoisomethyltetrahydrophtalic acid, N-(β-hydroxyethyl)-1,2-amidoendomethylene trahydrophtalic acid, or mixture thereof (39.6-40.9 wt parts), polymerizable diluent: oligoether acrylate (36.0-48.7 wt parts), and peroxide initiator (0.8-1.0 wt parts), oligoether acrylate including also target additives (2.4-14.0 wt parts), and optionally low-molecular weight epoxy acid as second binder (2.0-12.1 wt parts).
EFFECT: improved performance characteristics.
2 tbl, 13 ex
FIELD: penetration materials.
SUBSTANCE: invention relates to insulating heat-resistant penetration compounds having improved physicochemical characteristics. Proposed compound comprises (wt parts): unsaturated nitrogen-containing polyester (37-39) prepared via polycondensation of unsaturated dicarboxylic acid anhydrides and polyatomic alcohols with N-(β-hydroxyethyl)-1,2-amidodicarboxylic acid; polymerizable diluent (36-128): polycarboxylic acid allyl esters and/or oligoetheracrylates; free-radical initiator (0.8-3.5); polymerization accelerator (0.4-1.6); inhibitor (0.04-0.6); and special additives (0.08-1.0). N-(β-Hydroxyethyl)-1,2-amidodicarboxylic acid is prepared by reaction of 2-aminoethanol and cyclic 1,2-dicarboxylic acid anhydrides. Method of preparing claimed compound is also described. To improve physicomechanical characteristics, additional addition of low-molecular weight epoxide resin in amount of 5-14.5 wt parts per 100 wt parts compound is possible.
EFFECT: reduced viscosity, environmental and fire safety at elevated heat resistance.
3 cl, 7 tbl, 22 ex
FIELD: electricity, chemistry.
SUBSTANCE: electrically insulating polyetherimide siliceous varnish is suggested, composed of polyetherimide siliceous resin, solvent, tetrabutoxytitan and cresol solvent obtained through processing of coal-tar oil and further composed of phenol, o-, m-, p- cresols, and xylenols with the following fractional composition, % (volumetric): below 180°С no more than 3, from 180 to 205°С no less than 70, up to 210°С no less than 85. The technical result achieved by implementing the invention comprises lowering of varhish cost together with improvement of final product quality due to exclusion of expensive tricresol from varhish composition and its replacement by cresol solvent obtained by coal-tar oil processing.
EFFECT: obtained varnish provides for reliable protection of wires with polyetherimide insulation with temperature index of 155.
1 tbl, 9 ex
SUBSTANCE: varnish contains a varnish base, a functional additive which increases coating hardness, siccative HF and methyl ethyl ketoxime radical polymerisation inhibitor. The varnish base is an oligomer with strongly polar chromane rings. The oligomer is obtained by reacting tung oil and 101L phenol-formaldehyde resin, taken in equivalent ratio of 1:0.15-0.18, respectively, while heating said mixture for 60 minutes at temperature 160°C. After extracting water, temperature is raised to 182°C until achieving viscosity of 25-36 s. The oligomer is added to the composition in 50% xylene solution. The functional additive used is rosin ester with glycerine. Components are in the following ratio, wt %: oligomer - 31.0-36.2, rosin ester with glycerine - 9.0-3.8, siccative HF - 2.00, methyl ethyl ketoxime - 0.60, xylene - the balance.
EFFECT: wider raw material base, replacing molten amber, which is not produced on an industrial scale, with rosin ester with glycerine, high content of non-volatile substances, elasticity and electrical strength of the coating.
1 tbl, 2 ex
SUBSTANCE: electric insulating liquid is proposed, which represents a fluorine-containing dielectric liquid for electric insulation of high-voltage electric equipment, differing by the fact that the dielectric liquid comprises 99.95% of di(octafluoropentyl) ether and 0.05% admixtures of polar gases.
EFFECT: environmental safety, higher efficiency and reliability of operation of high-voltage electric equipment, cheapness and affordability of dielectric liquid.
2 tbl, 1 ex