A method of obtaining a thin mica paper
(57) Abstract:The invention can be used in the manufacture of electrical insulating and heat materials. The method includes armirovanie mica at t = 250-850°C for 10-60 min, treatment with a special solution, peroxide compounds for 0.25 to 48 hours, hydraulic dispersion make, grading upward flow of water with a speed of 8 to 20 cm/min and reflux of the paper web. The technical result is to obtain a thin mica paper with a thickness from 5 μm mica phlogopite and Muscovite with ensuring a high level of electrophysical and mechanical characteristics. table 1. The invention relates to the manufacture of mica paper and can be used in the manufacture of electrical insulating materials.A method of obtaining electrical insulating mica paper, including armirovanie mica, processing it with a solution of hydrogen peroxide, hydraulic and dispersion make subsequent outflow of the paper web (USSR, A. S. N 1356009, publ. 30.11.87 g, class H 01 B 19/00). There is a method allows to obtain high-quality paper on any natural water without artificial softening.However, this method does not allow the atoms present invention is to obtain a very fine mica paper with a thickness from 5 μm mica phlogopite and Muscovite with a high level of electrophysical and mechanical characteristics.This result is achieved by the fact that in the proposed method of obtaining a thin mica paper with a thickness of 5 μm is armirovanie mica phlogopite and Muscovite at a temperature of 250-850oC for 10-60 min, processing it with a solution of peroxide compounds for 0.25 to 48 hours in a solution of the following composition, wt.%:
Peroxy compound - 1-40
Catalyst - 0-20
Water - the Rest
hydraulic dispersion, classification mica pulp upward flow of water with a speed of 8 to 20 cm/min and the subsequent low tide sheet of paper.When armirovanie crystal mica increases its interplanar distances through the allocation of water bound in the crystal structure. When processing such a crystal solutions of peroxide compounds is the penetration of the solution into the volume of the crystal mica, multiple increase its volume and separation by cleavage planes. Hydraulic dispersion make it destroys the expanded crystal mica, thus obtained particles of mica with a high characteristic ratio: more than 2000. Subsequent classification makes it possible to separate the usable particles of mica for shimmer high quality mica paper on plascoat is presented in redox reactions. The catalyst speeds up the process of swelling mica and allows you to embed this process into existing production lines of mica paper. As peroxide compounds using hydrogen peroxide.The claimed method is illustrated by examples.Example 1
Crystals of phlogopite terminous at a temperature of T = 350oC for 15 minutes and placed in an aqueous solution containing 7% hydrogen peroxide, and 8% of catalyst was incubated for 3 hours, water was dispersed classified at 19 cm/min and cast on the paper machine.Example 2
Crystals of phlogopite terminous at T = 250oC for 30 minutes and placed in an aqueous solution containing 10% hydrogen peroxide and 10% catalyst, incubated for 24 hours, water-dispersed, are classified in 16 cm/min and cast on the paper machine.Example 3
Crystals of Muscovite terminous at T = 800oC for 15 minutes and placed in an aqueous solution containing 10% hydrogen peroxide and 10% catalyst was incubated for 15 hours, water-dispersed, classified in 8 cm/min and cast on the paper machine.Example 4
Crystals of Muscovite termer is their 48 hours hydraulically dispersed classified in 9 cm/min and cast on the paper machine.As can be seen from the table, the present invention enables to obtain a thin mica paper with a thickness of 5 μm with high electrical and physical properties. A method of obtaining a thin mica paper with a thickness of 5 μm, including armirovanie mica phlogopite and Muscovite at a temperature of 250 to 850°C. for 10 to 60 min, treated with a solution of peroxide compounds are within 0.25 to 48 h in a solution of the following composition, wt.%:
Peroxy compound is 1 - 40
Catalyst - 0 - 20
Water - the Rest
hydraulic dispersion make, classification mica pulp upward flow of water with a speed of 8 to 20 cm/min and the subsequent outflow of the paper web.
FIELD: manufacturing technology.
SUBSTANCE: invention relates to a pellet consisting of aramid pulp, filler material and moisture, wherein pellet contains not more than 90 wt% aramid pulp, at least 10 wt% filler material and less than 10 wt% moisture and in which amount of moisture, amount of aramid pulp and amount of filler material is 100 % by weight of pellet.
EFFECT: invention also relates to a method for production of such pellet.
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: 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: physics; electricity.
SUBSTANCE: fibre glass layer contains out-of-wind fibre glass. It can be woven fibre glass fabric. The material is applied mainly for covering electric conductor, such as wire applicable for high-temperature environments and coils for high-voltage electric motors and generators.
EFFECT: possibility of production of thinner insulation material without deterioration of mechanical or electric properties.
19 cl, 3 tbl, 3 ex
SUBSTANCE: invention relates to a heat-resistant wire or cable with improved operational properties designed for use in demanding or extreme conditions, for example in well drilling or field development, in industrial, military aerospace, naval fields, as well as in the motorcar, railway and public transport. Such cables can be subjected to extreme temperatures, corrosive substances or atmospheres or fire. The wire or cable comprises a conductor and a polymer sheath consisting of an internal and an external layer. One layer is tape made of polyetheretherketone (PEEK) and has thickness of 5-150 mcm. The second layer is fire-resistant and is made of a siloxane polymer or a polymer based on silicon dioxide as a polymer matrix. The PEEK tape can be combined with a mica layer or a layer which is polymer tape with mica particles.
EFFECT: invention increases fire-resistance of the sheath, its flexibility and resistance to mechanical stress, enables to obtain a wire or cable with a lower weight and diameter.
12 cl, 5 dwg
SUBSTANCE: improved electrically insulating tape (16) is offered which comprises the protective layer (20) and the electrically insulating layer (18) joined with the protective layer (20). At least, one of either the electrically insulating layer (18) or the protective layer (20) includes a set of formed apertures (26) to improve penetration of impregnating pitch into the insulating tape (16) during pitch impregnation.
EFFECT: invention provides optimum impregnation of the tape that improves the ability to resist to impact of voltage and premature breakdown and accident.
10 cl, 11 dwg
SUBSTANCE: invention relates to heat-resistant polymer materials based on organosilicon binder for making electric insulating materials and developing design of winding wires. Composition includes organosilicon resins (A) and (B), poly(dimethyl siloxane) (C), poly(dimethyl methyl hydride siloxane) (D), and platinum catalyst (E). Design of winding wire contains conductor thread coated with two-layer, thermally treated insulation, first layer therein is made from mica-containing tape consisting of electrically insulating glass fabric and mica paper, impregnated and glued together with said composition, and second layer therein is made of polyimide fluoroplastic film.
EFFECT: technical result of invention is producing electric insulating materials with high flexibility and fire-resistance, and also higher corona-proofness and flexibility of wire insulation.
4 cl, 1 tbl, 7 ex
SUBSTANCE: invention relates to high performance, high temperature resistant wires and cables as well as to a method for production thereof. Said wires and cables are fire-resistant and are used in heavy operating conditions, such as drilling or mining operations, industrial, military, aerospace and sea applications. Tape (20) comprises a laminated or co-extruded insulating first layer (24) of a polymer matrix in which mica particles are dispersed and second layer (26) of a polyether ether ketone (PEEK) or a blend or alloy thereof containing at least 50 wt% of PEEK. Surface of at least one said layer, opposite other said layer, is coated with fluoropolymer film (25). Sid tape can be used to form a multilayer coating on conductor (10) such as an electric wire. Outer protective layer (28) of a fluoropolymer such as PTFE may be applied around wrapped tape, by wrapping or extrusion.
EFFECT: technical result is production of wires and cables with good insulation, high temperature resistance, and also having improved mechanical properties at high temperatures.
59 cl, 4 dwg, 1 tbl