Electrical insulating varnish

 

(57) Abstract:

The invention relates to electrical insulating varnish for insulating electrical conductors, providing high temperature pressing of insulation (not below 320oC) and a temperature index of not lower than 180. Insulating varnish contains 27,00 - 40.00 wt.h. oligoasthenozoospermia based on ethylene glycol, Tris(2-hydroxyethyl)isocyanurate, terephthalate, or mixtures thereof with terephthalic acid in a molar ratio of(0,5 - 0,8) : (0,2 - 0,5), trimellitic anhydride and 4,41diaminodiphenylmethane taken in a molar ratio of(3,2 - 4,5) : (1,3 - 2,0) :1 : (2,0 - 3,0) : (1,0 - 1,5), with an acid number of 1 to 10 mgKOH/g and number of hydroxyl groups 8,0 - 11,0%, 59,20 - 72,46 wt.h. aromatic solvent, 0,54 - to 0.80 wt. including Olkiluoto ether orthotitanate acid. As the aromatic solvent lacquer contains a mixture of tricresol (or decretal) and solvent at a mass ratio (3 - 4) : 1. 3 table.

The invention relates to electrical insulating varnishes on the basis of oligopyrimidine, in particular of oligoasthenozoospermia, and can be used to isolate electrical conductors.

Known oligoasthenozoospermia on ozendirenler when the ratio(2,0-7,3):(0,7-1,1):1:(1,4-3,5): (0,7-1,75) [1].

Known oligoasthenozoospermia used as insulating material applied from the melt on the conductor. It can be used for this purpose in the form of a solution in a mixture of cresol and solvent. However, it is feasible for a limited range of sizes enamelled wire due to the reduced viscosity of this varnish. This factor, as well as a significant concentration of low molecular weight products in the base lacquer does not allow to process it on modern high-speed equipment.

The closest in technical essence to the present invention is electrically insulating composition [2], containing oligophrenic, aromatic solvent and alkilany ether orthotitanate acid - tetrabutoxide in the following ratio, wt.%:

Oligophrenin - 15,0 - 35,0

Aromatic solvent - 64,4 is 84.7

Alkilany ether orthotitanate acid (tetrabutoxide) - 0,3 - 0,6

Oligophrenic in this composition derived from ethylene glycol, glycerol, dimethyl terephthalate, trimethylsilanol anhydride and 4,41diaminodiphenylmethane at a molar ratio of(1,50-1,55):(0,40-0,45):1:(0,80-1,10):(0,40-0,55).

As the aromatic solvent used is matirovannym wire with TI 155, at the same time its temperature forcing isolation varies 240-265oC.

Technology for oligoimide involves carrying out the process in four stages, and therefore the total duration of the technological process of synthesis is 56-60 hours.

The task was to create a nail lacquer that provides high temperature forcing isolation enameled wires (not lower than 320oC) with a temperature index of not lower than 180 in a wide range of sizes, capable of processing on modern high-speed equipment.

According to the invention, insulating varnish containing oligophrenic, aromatic solvent and alkilany ether orthotitanate acid, as oligopyrimidine contains oligoasthenozoospermia based on ethylene glycol, Tris(2-hydroxyethyl)isocyanurate, terephthalate, or mixtures thereof with terephthalic acid in a molar ratio of(0,5-0,8):(0,2-0,5), trimellitic anhydride and 4,41diaminodiphenylmethane taken in a molar ratio of- (3,2-4,5): (1,3-2,0): 1:(2,0-3,0):(1,0-1,5), with an acid number of 1 to 10 mgKOH/g, the number of hydroxyl groups of 8.0 to 11% in the following ratio, wt.h.: ol is 54-0,80.

As the aromatic solvent lacquer contains a mixture of tricresol (or decretal) and solvent at a mass ratio (3-4):1, as Olkiluoto ether orthotitanate acid, for example, tetraethoxysilane or polybutylene, which is a product of partial hydrolysis of tetramethoxysilane, depending on the synthesis conditions get tetrabutoxide or polybutylene.

Vzaimozavisimy each other and providing equivalent effect are other known esters orthotitanate acid, such as methyl, propyl, isopropyl.

As the basis varnish contains oligoasthenozoospermia obtained by the condensation of ethylene glycol, Tris(2-hydroxyethyl)isocyanurate, terephthalate, or mixtures thereof with terephthalic acid in a molar ratio of(0,5-0,8): (0,2-0,5), trimellitic anhydride and 4,4'-diaminodiphenylmethane, with a ratio of(3,2-4,5):(1,3-2,0):1:(2,0-3,0):(1,0-1,5).

The use of less than 0.2 mol of terephthalic acid in the mixture it with dimethylterephthalate does not change one of the essential characteristics of isolation enamelled wire on the basis of oligoasthenozoospermia - temperature pressing.

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The catalysts of the process of synthesis of oligoasthenozoospermia are tetrabutoxide and acetic acid zinc, which are not included in the structure of the oligomer.

Oligoasthenozoospermia receive the synthesis of these reagents in two stages. In the case of using dimethyl terephthalate in the first stage, carried out the reaction between the calculated amount of ethylene glycol, Tris(2-hydroxyethyl)isocyanurate, exporter and half of the estimated number of trimellitic anhydride and 4,41diaminodiphenylmethane at a temperature of 145-190oC with the speed of temperature rise 5-7oC per hour and maintained at a temperature of 190oC for 1-1 .5 hours to achieve transparency of the reaction mass and obtain the estimated number of eye-catching side reaction products (not less than 95% of theoretical amount). In the second stage at a temperature of 145 - 150oC enter the second half of the estimated number of trimellitic anhydride, and then at a temperature of 140-145oC enter the second half of the calculated amount of 4,41diaminodiphenylmethane and conducting the condensation at 145-205oC with the speed of temperature rise of 10oC per hour, maintained at a temperature of 200-205oC to receive the PP).

When this temperature reaches 190-197oC reaction mass becomes transparent at a temperature of 200oC the process is carried out in a current of inert gas.

In the first stage of the process, to facilitate removal of methyl alcohol and water, and prevent sublimation exporter in the synthesis impose xylene in the amount of 25% by weight of dimethylterephthalate, which is then Argonauts together with water and methyl alcohol.

The total duration of the synthesis of oligoasthenozoospermia - 18-20 hours

In the case of using a mixture of terephthalate to terephthalic acid in the first stage, carried out the reaction between the calculated amount of ethylene glycol, Tris(2-hydroxyethyl)isocyanurate, terephthalate, terephthalic acid, and half of the estimated number of trimellitic anhydride and 4,41diaminodiphenylmethane environment tricresol (dicrete) at a temperature of 145-185oC with the speed of 5-7oC per hour and maintained at a temperature of 185oC to achieve transparency and obtain the estimated number of eye-catching side reaction products. In the second stage at a temperature of 140-145oC enter the second half of the estimated number of thew lifting 10oC per hour, maintained at a temperature of 195-200oC to obtain oligoasthenozoospermia with certain characteristics (acid number, the content of hydroxyl groups).

When the temperature reaches 195oC the process is carried out in a current of inert gas.

The total duration of the synthesis of oligoasthenozoospermia 18-20 hours

Insulating varnish was prepared using the following technique.

Pre-calculated amount of tricresol (or decretal) is divided into three parts: the first is 22% of the number of oligomerization specified in the recipe, the third part is equal to five times the number of polybutylene (or tetraethoxysilane), the second part is calculated as the difference between the total number of tricresol specified in the recipe, and the sum of the first and third part.

In oligoasthenozoospermia at a temperature of 190oC enter the first part of tricresol, then maintained at 180oC, at 140oC enter the second part of tricresol and maintained at this temperature. At a temperature of 100oC enter the solvent and maintained by a particular mode. If 65oC enter alkilany ether orthotitanate acid (Rast is de 100% product and 50% of the solution.

The invention is illustrated by examples: in the examples 1-5 described the synthesis of oligoasthenozoospermia, fundamentals of the proposed varnish, as in examples 6-10 - receiving insulating varnish.

Example 1. In chetyrehosnuju flask equipped with a stirrer, a thermometer, a tube for inert gas supply connected direct refrigerator with receiver eye-catching products, download the following components in amounts shown in table. 1, in the following sequence: xylene, glycol, terephthalate, Tris(2-hydroxyethyl)isocyanurate. Heat the contents of the flask over 1.5 hours before melting (120oC) let the mixer, enter tetrabutoxide and acetic acid zinc. The temperature was raised to 140oC, enter trimellitic anhydride (50% of estimated amount), stirred the reaction mass for 15-20 minutes, raising the temperature to 145oC, and then at this temperature administered 4,41-diaminodiphenylmethane (50% of estimated amount). Then at 5-7oC per hour to raise the temperature to 190oC and kept at this temperature until transparent reaction mixture (sample on glass).

At a temperature of 150oC begins the evolution of a mixture of water, meta is alongi should not exceed 100oC.

After achieving the transparency of the contents of the flask cooled to a temperature of 145oC and injected sequentially second portion (50% of estimated amount) trimellitic anhydride and 4,41diaminodiphenylmethane. Start temperature rise at a rate of 10oC per hour.

If 150oC starts the allocation of water. The temperature of the distillate at the top of the column should not exceed 100oC. Upon reaching 195-197oC mass becomes transparent (sample on glass). At a temperature of 197oC select the first sample to the determination of time of gelatinization, change column on the nozzle vyurts and lead the removal of by-products of the reaction by direct distillation from the reaction flask in a stream of inert gas. Raise the temperature to 200-205oC and maintain the reaction mass at this temperature to obtain oligoasthenozoospermia with time gelatinization s at a temperature 2502oC, sample 1,

The final product has an acid number of 1.2 mgKOH/g and contains 9.0% of hydroxyl groups.

Example 2. Oligoasthenozoospermia receive in accordance with the formulation shown in table.1, according to the technology described in example 1, the synthesis process to finish Costigan/g and contains 9.6% of hydroxyl groups.

Example 3. Oligoasthenozoospermia receive in accordance with the formulation shown in table. 1, according to the technology described in example 1.

The process finished by the time reaches the gelatinization s.

The final oligoasthenozoospermia has an acid number of 1.0 mgKOH/g and contains 8,0% hydroxyl groups.

Example 4. In chetyrehosnuju flask equipped with a stirrer, a thermometer, a tube for inert gas supply connected direct refrigerator with receiver eye-catching products, download the following components of the formulation in amounts shown in table.1, in the following sequence: ethylene glycol, cresol, dimethylterephthalate, Tris(2-hydroxyethyl)isocyanurate. Heat the contents of the flask for 1 hour to melt (100oC), let a stirrer, heated to 115oC for 0.5 hours, enter terephthalic acid, tetrabutoxide and acetic acid zinc. The temperature was raised to 140oC, enter trimellitic anhydride (50% of estimated amount), stirred the reaction mass for 15-20 minutes, raising the temperature to 145oC, and then at this temperature administered 4,41-diaminodiphenylmethane (50% of estimated amount). Then with the speed of the operating mass (sample on glass).

At a temperature of 150oC begins the evolution of a mixture of water and methanol, distillate which lead through the distillation column, the temperature of the distillate should not exceed 100oC.

Upon reaching the transparency of the contents of the flask cooled to a temperature of 150oC and enter the second portion (50% of estimated amount) trimellitic anhydride, and then at a temperature of 140-145oC enter the second portion (50% of estimated amount) of 4,41diaminodiphenylmethane. Start temperature rise at a rate of 10oC per hour. If 150oC starts the allocation of water.

The temperature at the top of the column should not exceed 100oC. Upon reaching 190-195oC mass becomes transparent (sample on glass). At a temperature of 195oC select the first sample to the determination of time of gelatinization, change column on the nozzle vyurts and lead the removal of by-products of the reaction by direct distillation and the reaction flask in a stream of inert gas. Raise the temperature to 197-200oC and kept at this temperature until receipt of oligoasthenozoospermia with time gelatinization 300c at 2502oC, hitch - g the Final product has an acid value of 10.0 mgKOH/g and contains 11,0% hydroxyl in the table. 1, according to the technology described in example 4, the synthesis process finish before the time reaches the gelatinization 280 C.

The final oligoasthenozoospermia has an acid number of 7.3 mgKOH/g and contains 10.2% of hydroxyl groups.

Examples 6-10. Get oligoasthenozoospermia according to examples 1-3.

In oligoasthenozoospermia examples 4, 5 determine the mass fraction cresol (2 g, 1.5 h, 200oC), which take into account when calculating the quantity of cresol in the formulation of the lacquer.

Download oligoasthenozoospermia in a three-neck flask equipped with stirrer, thermometer and reflux condenser, in accordance with the recipe shown in table. 2.

Heat the contents of the flask to fusion: let the mixer, raise the temperature to 190oC, enter through the back of the fridge first portion cresol, and then maintained at a temperature of 180oC for 3 hours, cooled to 140oC enter the second part of cresol and kept at this temperature for 5 hours, cooled to 100oC, injected solvent, soak 4 hours, the flask contents are cooled to 65oC and slowly through an addition funnel enter solution Olkiluoto ether orthotitanate acid in the third part it is presented in the table. 2. In table. 3 shows the results of tests lacquer examples 6-10, as well as the famous coat enameling.

Wire diameter 0,400 mm emulerat on the horizontal enalaprilate using the varnish of example 6.

The wire diameter of 0.800 to and 1,000 mm emulerat on vertical enalaprilate using the varnishes of examples 7-10, also known as lacquer.

As follows from the data table. 3, the proposed lacquer provides reception of enameled wires with temperature forcing 320-350oC, and thermal properties, the applicable requirements for enamelled wire with 180 and above, which is characterized by high resistance to thermal shock (1 at a temperature of 200oC for wire 0,400-1,000 mm), which significantly exceeds the known characteristics of lacquer (240oC and 3, respectively).

Electric insulating lacquer for coating on an electrical conductor containing oligophrenic, aromatic solvent, alkilany ether orthotitanate acid, characterized in that as oligopyrimidine it contains oligoasthenozoospermia based on ethylene glycol, Tris(2-hydroxyethyl)isocyanurate, terephthalate, or mixtures thereof with terephthalic acid in malnourishing (3,2 - 4,5):(1,3 - 2,0): 1:(2,0 - 3,0):(1,0 - 1,5) with an acid number of 1 to 10 mgKOH/g and number of hydroxyl groups 8,0 - 11,0%, and as an aromatic solvent contains a mixture of tricresol or decretal and solvent at a mass ratio (3 - 4):1 in the following ratio, wt.h.:

Oligoasthenozoospermia - 27,0 - 40,00

Aromatic solvent - 59,20 - 72,46

Alkilany ether orthotitanate acid - 0,54 - 0,80 and

 

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Antifriction coat // 2345110

FIELD: chemistry.

SUBSTANCE: antifriction coat can be used in gear pumps for reducing friction and wear resulted from corrosion or mechanical effects in tribojoints under effects of chemically active reagents, high temperature and loads on engaged parts to ensure required stable gaps between the said parts. The antifriction coat consists of three layers, i.e. inner, intermediate and upper layers. Note here that the inner layer represents a composition comprising 90 wt % of a polyimide varnish and 10 wt % of chromophosphatealuminic bond, the intermediate layer being made from 100 wt % of a pure polyimide varnish. Finally, the top layer represents a composition containing 90 wt % of polyimide varnish, 8 wt % of colloid graphite and 2 wt % of lecithin. Thickness of the aforesaid inner layer is within the limits of from 8 up to 10 mcm, thickness of the intermediate layer is within the limits of from 16 up to 20 mcm, thickness of the top layer is within the limits of from 24 up to 30 mcm, while the required thickness of the coat is provided by grinding the top layer.

EFFECT: longer life of friction assembly units and parts operated in chemically active environments.

2 tbl

FIELD: chemistry.

SUBSTANCE: composition for fixing wrapping articles contains A) 1-60 wt % of at lest one resin of α,β-unsaturated polyether based on at least one unsaturated mono-, di- or tricarboxylic acid and/or substance containing molecules with mono-, di- or tricarboxylic acid groups, at least one polyol, B) 0.1-80 wt % of at least one inorganic and/or an organic-inorganic hybrid component, having functional groups for reaction with components A) and C), where said hybrid components are polymers or colloidal solutions based on silicon, titanium or zirconium and oxygen atoms, which contain hydroxyl and/or alkoxy groups and/or hydroxyalkyloxy groups and/or organic fragments, which have epoxy and/or isocyanate and/or unsaturated groups, C) 2-80 wt % of at least one monomer and/or oligomeric unsaturated component, which is styrene, vinyl toluene, hexanediol dimethacrylate, butanediol dimethacrylate and/or (meth)acrylates of products of a polyaddition reaction of ethylene oxide with trimethylolpropane capable of reaction with components A and B, and D) 0-15 wt % conventional additives, where wt % is calculated relative the total weight of the composition.

EFFECT: excellent heat conductivity properties and high level of electrical insulation along with excellent adhesion and thermal stability.

6 cl, 1 tbl, 2 ex

FIELD: chemistry.

SUBSTANCE: invention relates to use of nanomaterials in wire enamel for improving thermal properties of enamel. The nanomodified wire enamels are usually used in making insulated winding wire. The polymer base of wire enamel is selected from a group comprising polyamideimide, polyester, polyesterimide, polyurethane and mixtures thereof. The nanomaterial is selected from a group comprising nano-oxides, metal nano-oxides, metal oxides or hydroxides of aluminium, tin, born, germanium, gallium, lead, transition metals, lanthanides, actinides and mixtures thereof. The nanomaterial is also selected from a group comprising nano-oxides, metal nano-oxides, metal oxides and hydroxides of aluminium, silicon, titanium, zinc, yttrium, vanadium, zirconium, nickel and mixtures thereof. After applying enamel on the wire and curing thereof, the wire exhibits improved thermal and mechanical properties.

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8 cl, 6 tbl

FIELD: chemistry.

SUBSTANCE: invention is aimed at aqueous binding solutions for primer coat of antistick coatings based on polyamideimide, polyether imide, also including water, amine and one or more solvents selected from acetoacetamides, guanidines, or mixtures of acetoacetamides and guanidines.

EFFECT: technical result is obtaining stable aqueous binding compositions with suitable toxicity profile and a good adhesion to substrate and good wear resistance.

6 cl, 3 tbl, 21 ex

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EFFECT: ensuring base coat composition which is cured during the dehydration stage resulting in a high degree of cure prior to depositing coating varnish, which allows to cure the coating varnish at a lower temperature.

1 dwg, 2 tbl, 4 ex

FIELD: chemistry.

SUBSTANCE: antiscuff coating is made from the composition, containing the following components (in weight percent): the organic binder of 30%-60%, the solid lubricant of 30%-60%, the corrosion inhibitor of 6%-15%, the levelling agent of 0.01%-0.1%, the wetting agent 0.01%-0.1% and in addition the mixture of solvents. The organic binder is the liquid polyamide-imide resin with the solids content of 38-42%. The solid lubricant is any substance from the molybdenum disulphide and tungsten disulphide or the combination of molybdenum disulphide or tungsten disulfide with polytetrafluoroethylene. Preferably, the solid lubrication and the corrosion inhibitor are the surface-modified with the silane bonding agent. The antiscuff coating is obtained by spraying the coating on the surface of the threaded joint of pump-compressor and casing tubes, treated with phosphate; thus avoiding the environmental contamination with the heavy metal powder, contained in the threaded grease.

EFFECT: production of coatings that have good antiscuff and anticorrosive properties.

7 cl, 8 dwg, 16 ex

FIELD: chemistry.

SUBSTANCE: composition of coating comprises a polymer material comprising a polyetherimide polymer, one or more titanate substances, one or more crosslinking agents reacting with OH-groups and one or more acidic polyester compounds.

EFFECT: invention allows to obtain compositions of coatings that can withstand aggressive chemicals contained in the cylinders, avoiding the use of toxic ingredients or solvents.

23 cl, 9 tbl, 10 ex

FIELD: chemistry.

SUBSTANCE: coated glass product is described comprising: a glass body comprising the first surface and the second surface opposite the first surface. The first surface is an outer surface of the glass products; and an anti-friction coating located in at least the first part of the surface of the glass body. The anti-friction coating includes a polymer chemical compound, the anti-friction coating has a thickness equal to or less than 1 micron, and a friction coefficient equal to or less than 0.7 compared to the same coated glass product. The polymer chemical compound is selected from the group consisting of polyimides, fluoropolymers, silsesquioxane-based polymers, silicon-organic polymers; the coated glass product retains its heat resistance after depirogenization at a temperature of at least 280°C for 30 minutes in air; the light transmission through the coated glass product is equal to or more than 55% of the light transmission through the uncoated glass product with the wavelength of 400 nm to 700 nm; and the anti-friction coating has a weight loss of less than 5% of its weight when heated from a temperature of 150°C to 350°C at a heating rate of 10°C/min. Other coated glass products are also described.

EFFECT: glass products with a high resistance to mechanical damage are produced.

18 cl, 1 tbl, 21 ex, 46 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

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