CN102127882A - Manufacturing method of ultra-high voltage insulation cooked mica paper - Google Patents
Manufacturing method of ultra-high voltage insulation cooked mica paper Download PDFInfo
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- CN102127882A CN102127882A CN 201010538658 CN201010538658A CN102127882A CN 102127882 A CN102127882 A CN 102127882A CN 201010538658 CN201010538658 CN 201010538658 CN 201010538658 A CN201010538658 A CN 201010538658A CN 102127882 A CN102127882 A CN 102127882A
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Abstract
The invention discloses a manufacturing method of ultra-high voltage insulation cooked mica paper, and aims to solve the problem that the mica paper prepared by the existing raw powder technique is not applicable to large-size power equipment. The method disclosed by the invention comprises the following steps: screening the mica raw material, calcining at high temperature, screening, dipping, making cooked mica pulp, manufacturing paper with the pulp, drying and the like. The mica paper produced by the method disclosed by the invention has the characteristics of high electric strength and high tensile strength.
Description
Technical field
The present invention relates to the mica paper production technical field, the insulate manufacture method of ripe mica paper of particularly a kind of extra-high voltage.
Background technology
Mica is a kind of laminar silicic acid salt mineral that generate naturally, the characteristic that has good physical property and electric property and under the condition of high temperature, still keep above performance, it has chemical inertness and low flammability completely, the most important thing is that it has anti-high voltage, corona-resistant and radiation-resistant characteristic.Therefore it is widely used in industrial departments such as electronics, motor, telecommunication, electrical equipment, aviation, traffic, instrument, metallurgy, building materials, light industry mainly as a kind of very important insulating materials, and national defence and sophisticated industry field.But be processed into the mica splitting goods from the mica raw ore, mica utilization rate therebetween only about 3% ~ 10%, has accumulated a large amount of mica flake slags for many years.In order to make full use of the garrulous mica resource, mica paper arises at the historic moment.Since mica paper comes out, on mica comprehensive utilization and base material, made huge contribution as insulating material, so mica paper manufacturing technology and large scale integrated circuit, high temperature plastics, optical fiber is run neck and neck, and is described as the four big technology electric to the present age, that electronics industry contributes.
Mica paper is to be raw material with fractus master slice (muscovite, phlogopite, artificial synthetic mica), under the slower speed of a motor vehicle of cylinder mould machine, copy into paper roll with chemical pulping or hydraulic slurrying, cut into roll web or sheet paper again, mica paper has kept the premium properties of natural mica, and thickness is even, the dielectric strength fluctuation range is little, corona inception voltage is high and stable; The voltage characteristic of its dielectric loss is much more stable than the mica splitting insulation, and thermal conductivity is good.Existing high-temperature calcination method of chemical treatment is produced mica paper, adopts and carry out acid treatment after with the mica flake high-temperature calcination, and this method environmental pollution is bigger.Application number is: 200610021922.6 Chinese invention patent, a kind of manufacture method of high voltage raw powder mica paper is disclosed, its technological process of production is for selecting materials, wash material, waterpower is divided the decorticating slurry, screening and dewatering, cyclone classification, concentrate, joining slurry manufactures paper with pulp, raw material high quality white mica, wash the material back and in pulper, carry out the stripping of disposable waterpower branch, after dividing the scale slurries that stripping granulates with the mica raw material, carry out classification through the two-stage vortrap again, isolate the high-quality dry pulp, in pulp storage tank, add at last the water stirring and convert into the slurries that concentration is 6-9%, manufacture paper with pulp into mica paper through paper machine.The electrical strength and the TENSILE STRENGTH of the mica paper that this method is produced are undesirable, and the mica paper that fecula technology makes is applicable to small-sized power equipment, is not suitable for large scale electrical power unit.
Summary of the invention
The objective of the invention is to overcome the problems referred to above that prior art exists, a kind of method of producing mica paper by ripe powder craft is provided, the mica paper of producing by method of the present invention has electrical strength and the good characteristics of TENSILE STRENGTH.
Another object of the present invention is to provide a kind of extra-high voltage ripe mica paper that insulate.
The technical solution adopted for the present invention to solve the technical problems is:
The insulate manufacture method of ripe mica paper of a kind of extra-high voltage, described manufacture method may further comprise the steps:
1. mica raw material screening; The present invention is a raw material with the muscovite fragment, muscovite, and its monocrystalline is false hexagonal columnar, platelike crystal, and little person is flakey, and big person has hundreds of square centimeters; The stripping branch is better than other mica, therefore should be used for making large stretch of lepidolite paper.The chemical stability that muscovite itself is had, the characteristic of aspects such as heat resistance, mechanical performance, electric property, the scale that adds big scale mica paper makes it have good performance much larger than general mica paper; It also because of its superior anti-general character, air permeability height, good penetrability and suction glue amount of cutting is little, suits to do the base material of few glue or middle glue mica tape except general mica range of application;
2. high-temperature calcination: 600 ~ 800 ℃, calcine and got the mica grog in 50 ~ 80 minutes; High-temperature calcination makes mica flake along direction expansion, layering perpendicular to cleavage surface, quality deliquescing in order to slough the partially crystallizable water in the mica structure; High-temperature calcination also can allow and be present in impurity such as crystallization stone in the mica flake, silt and become ash content, is convenient to removal of impurities;
3. sieve: the mica grog is crossed 4 ~ 10 mesh sieves; The purpose of this step is to remove ash content that the crystallization stone that is mixed in the mica flake, silt, combustibles forms and diameter less than 5 millimeters mica flake;
4. flood: the mica grog after sieving flooded 5 ~ 30 minutes in mass concentration 60 ~ 90% sal volatiles; Behind the mica grog dipping ammonium carbonate, can when the next step still heats, be decomposed into carbon dioxide and ammonia, act on mica flake, impel mica cracked;
5. ripe mica slurry is made: the mica grog behind the dipping: the part by weight of water=1:6 ~ 1:14 adds in the reactor, pass to steam in the reactor reactor is heated to 100 ~ 200 ℃, kept 10 ~ 90 minutes, get ripe mica slurry, thin up is 2 ~ 3 times in the ripe mica slurry, ripe mica slurry after the dilution sieves, and dehydration is condensed into dry pulp; The heating thermal source of reactor is a steam, and vapor (steam) temperature is at 100 ~ 200 ℃, and steam feeds in the reactor bottom, when heating, play strong stirring action so simultaneously, make mica fully separate and obtain less scale, the scale radius-thickness ratio is big, mica grog pulping efficient height; Radius-thickness ratio is meant that the nonmetallic mineral with layer structure is after ultra-fine grinding, the diameter of sheet particulate monomer and the ratio of its thickness, radius-thickness ratio is one of important physical index of mica crushing effect, this parameter is big more, its processing performance is good more, and the mica paper product quality of producing is good more; Thin up can play cooling effect in the ripe mica slurry, is convenient to next step the sieve classification of crossing, thereby obtains paper making pulp better;
6. manufacture paper with pulp: the dry pulp thin up becomes the slurries of mass concentration 2 ~ 3%, and cylinder is copied paper; Cylinder is copied paper and is carried out in cylinder paper machine, arrive at slurries before the cylinder of cylinder paper machine, a dilution step is arranged, after copying paper on the cylinder, then mica slurry dehydration, by Van der Waals force and the electrostatic attraction that exists between the clean mica flake, make mica flake interconnect into page, cylinder paper machine is simple in structure, and is easy to operate, but pay special attention to net part forming and dehydration, guarantee that the mica paper thickness is even; The paper that cylinder paper machine obtains among the present invention is sloughed 95% ~ 98% moisture content;
7. oven dry: the one-tenth paper that obtains after 6. through step is dried in drying cylinder to moisture 0.2 ~ 0.5% and is got product.Dryer temperature is between 87 ~ 92 ℃; In order to guarantee that mica paper has excellent insulating properties, control finished paper moisture 0.2 ~ 0.5%.
As preferably, step 5. in, the steam pressure that feeds in the reactor is 0.1 ~ 0.3MPa.The control steam pressure guarantees that mica fully separates the less scale of acquisition.
As preferably, step 5. in, the ripe mica after the dilution was starched 6 ~ 22 mesh sieves.The Size Distribution of mica flake has considerable influence to the electrical strength and the TENSILE STRENGTH of mica paper, on technology, need to pay close attention to, therefore by controlling sieve mesh, obtain the suitable mica flake of size, thereby obtain electrical strength and TENSILE STRENGTH mica paper preferably.
As preferably, before copying paper on the cylinder, slurries further are diluted to mass concentration 0.3 ~ 0.7%.Be beneficial to the thickness that is controlled to paper like this, obtain the good product of performance.
As preferably, described mica raw material screening is earlier the mica raw material to be carried out artificial separation, and then sieves.Raw material is the muscovite fragment, and artificial separation is used to remove the biotite that is unsuitable for making ripe mica paper, euchlorite etc., further sieves after the artificial separation again, can tentatively remove the impurity such as stone, silt that decrystallize.
As preferably, described mica raw material is a muscovite.The mica paper that muscovite becomes by the fecula processes: the anti-general character, air permeability height, good penetrability and the suction glue amount of cutting is little, the suitable base material of doing few glue or middle glue mica tape; And the present invention is processed into muscovite by ripe powder craft mica paper: the anti-general character, air permeability height, good penetrability, suction glue amount of cutting is big, the suitable base material of doing many glue mica tapes;
The invention has the beneficial effects as follows: 1, manufacturing technique is simple, and production cost is low.2, the mica paper electrical strength and the TENSILE STRENGTH that make are good.
The specific embodiment
Below by specific embodiment, technical scheme of the present invention is described in further detail.
Embodiment 1:
With the natural muscovite fragment is raw material, earlier raw material is carried out artificial separation, remove the biotite that is unsuitable for making ripe mica paper, euchlorite etc., further again mistake 8 mesh sieves after the artificial separation, can tentatively remove the impurity such as stone, silt that decrystallize, guarantee the pure of mica flake.Pure mica flake is packed in the electric furnace, be heated to 600 ℃ of calcinings 80 minutes, mica flake after calcining claims the mica grog, the mica grog is crossed 4 mesh sieves, mica grog after will sieving then flooded 30 minutes in mass concentration 60% sal volatile, the part by weight of mica grog behind the dipping: water=1:6 is added in the reactor, bottom in the reactor passes to steam reactor is heated to 100 ℃, kept 90 minutes, the steam pressure that feeds is 0.3 MPa, get ripe mica slurry, thin up is 2 times in the ripe mica slurry, and the ripe mica slurry after the dilution flows in the swinging rotary strainer and carries out classification, rotary strainer mesh 6 orders, thick slag is from sieving outflow, and qualified screened stock is condensed into dry pulp through sieving down the inflow centrifuge dewatering.The dry pulp thin up becomes the slurries of mass concentration 2%, add in the cylinder paper machine then, before copying paper on the cylinder slurries further are diluted to mass concentration 0.3%, the one-tenth paper that cylinder paper machine comes out has been sloughed 95% moisture, dries then to moisture 0.2% to get product in 87 ℃ of drying cylinders.
Embodiment 2:
With the natural muscovite fragment is raw material, earlier raw material is carried out artificial separation, remove the biotite that is unsuitable for making ripe mica paper, euchlorite etc., further again mistake 4 mesh sieves after the artificial separation, can tentatively remove the impurity such as stone, silt that decrystallize, guarantee the pure of mica flake.Pure mica flake is packed in the electric furnace, be heated to 800 ℃ of calcinings 50 minutes, mica flake after calcining claims the mica grog, the mica grog is crossed 10 mesh sieves, mica grog after will sieving then flooded 5 minutes in mass concentration 90% sal volatile, the part by weight of mica grog behind the dipping: water=1:14 is added in the reactor, bottom in the reactor passes to steam reactor is heated to 200 ℃, kept 10 minutes, the steam pressure that feeds is 0.1 MPa, get ripe mica slurry, thin up is 3 times in the ripe mica slurry, and the ripe mica slurry after the dilution flows in the swinging rotary strainer and carries out classification, rotary strainer mesh 22 orders, thick slag is from sieving outflow, and qualified screened stock is condensed into dry pulp through sieving down the inflow centrifuge dewatering.The dry pulp thin up becomes the slurries of mass concentration 3%, add in the cylinder paper machine then, before copying paper on the cylinder slurries further are diluted to mass concentration 0.7%, the one-tenth paper that cylinder paper machine comes out has been sloughed 98% moisture, dries then to moisture 0.5% to get product in 92 ℃ of drying cylinders.
Embodiment 3:
With the natural muscovite fragment is raw material, earlier raw material is carried out artificial separation, remove the biotite that is unsuitable for making ripe mica paper, euchlorite etc., further again mistake 6 mesh sieves after the artificial separation, can tentatively remove the impurity such as stone, silt that decrystallize, guarantee the pure of mica flake.Pure mica flake is packed in the electric furnace, be heated to 700 ℃ of calcinings 60 minutes, mica flake after calcining claims the mica grog, the mica grog is crossed 8 mesh sieves, mica grog after will sieving then flooded 20 minutes in mass concentration 70% sal volatile, the part by weight of mica grog behind the dipping: water=1:10 is added in the reactor, bottom in the reactor passes to steam reactor is heated to 120 ℃, kept 60 minutes, the steam pressure that feeds is 0.2 MPa, get ripe mica slurry, thin up is 2.5 times in the ripe mica slurry, and the ripe mica slurry after the dilution flows in the swinging rotary strainer and carries out classification, rotary strainer mesh 8 orders, thick slag is from sieving outflow, and qualified screened stock is condensed into dry pulp through sieving down the inflow centrifuge dewatering.The dry pulp thin up becomes the slurries of mass concentration 2.5%, add in the cylinder paper machine then, before copying paper on the cylinder slurries further are diluted to mass concentration 0.5%, the one-tenth paper that cylinder paper machine comes out has been sloughed 96% moisture, dries then to moisture 0.3% to get product in 90 ℃ of drying cylinders.
The ripe mica paper electrical strength and the TENSILE STRENGTH of producing by method of the present invention are good, and testing result sees Table 1:
Above-described embodiment is the preferable scheme of the present invention, is not the present invention is done any pro forma restriction, also has other variant and remodeling under the prerequisite that does not exceed the technical scheme that claim puts down in writing.
Claims (6)
1. the extra-high voltage manufacture method of ripe mica paper that insulate, it is characterized in that: described manufacture method may further comprise the steps:
1. mica raw material screening;
2. high-temperature calcination: 600 ~ 800 ℃, calcine and got the mica grog in 50 ~ 80 minutes;
3. sieve: the mica grog is crossed 4 ~ 10 mesh sieves;
4. flood: the mica grog after sieving flooded 5 ~ 30 minutes in mass concentration 60 ~ 90% sal volatiles;
5. ripe mica slurry is made: the mica grog behind the dipping: the part by weight of water=1:6 ~ 1:14 adds in the reactor, pass to steam in the reactor reactor is heated to 100 ~ 200 ℃, kept 10 ~ 90 minutes, get ripe mica slurry, thin up is 2 ~ 3 times in the ripe mica slurry, ripe mica slurry after the dilution sieves, and dehydration is condensed into dry pulp;
6. manufacture paper with pulp: the dry pulp thin up becomes the slurries of mass concentration 2 ~ 3%, and cylinder is copied paper;
7. oven dry: the one-tenth paper that obtains after 6. through step is dried in drying cylinder to moisture 0.2 ~ 0.5% and is got product.
2. the insulate manufacture method of ripe mica paper of extra-high voltage according to claim 1 is characterized in that: step 5. in, the steam pressure that feeds in the reactor is 0.1 ~ 0.3MPa.
3. the insulate manufacture method of ripe mica paper of extra-high voltage according to claim 1 is characterized in that: step 5. in, the ripe mica after the dilution was starched 6 ~ 22 mesh sieves.
4. the insulate manufacture method of ripe mica paper of extra-high voltage according to claim 1 is characterized in that: before copying paper on the cylinder slurries further are diluted to mass concentration 0.3 ~ 0.7%.
5. according to the insulate manufacture method of ripe mica paper of claim 1 or 2 or 3 or 4 described extra-high voltages, it is characterized in that: described mica raw material screening is earlier the mica raw material to be carried out artificial separation, and then sieves.
6. according to the insulate manufacture method of ripe mica paper of claim 1 or 2 or 3 or 4 described extra-high voltages, it is characterized in that: described mica raw material is a muscovite.
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