JPS5948481B2 - Laminated mica thin leaf material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a laminated mica thin film material used, for example, as an insulating tape for electrical equipment.

In general, when mica is used as an electrical insulating material, it is mainly used as mica paper, mica tape, or mica board.Among these, mica paper or mica tape used as thin material are made of natural hagashima mica or Natural laminated mica has been used.

Such thin mica materials are required to have excellent electrical insulation and mechanical strength, have appropriate flexibility, and not become sticky during use. By the way, when using Hagashi mica as mica, it is applied to a support material such as insulating paper, cotton cloth, synthetic fiber cloth, synthetic resin film, glass cloth, non-woven fabric, etc. by dissolving or dispersing it with an organic adhesive in water or an organic solvent. It is common to manufacture the film by attaching it to an appropriate thickness using a binder.

In this case, it is inevitable that the thickness will be non-uniform due to the fact that the pieces of silver mica having a considerable thickness are overlapped and manufactured. Furthermore, since the adhesion of the mica pieces to each other by the above-mentioned binder is not very good, poor adhesion tends to occur, and the resulting minute voids often cause dielectric breakdown. In addition, mica thin leaf materials are generally used in combination with impregnated resin, but since the above-mentioned thin mica thin leaf materials use mica pieces that are incomparably larger than those of laminated mica, the permeability of the impregnated resin is However, it has the disadvantage that it is difficult to penetrate sufficiently into the interior, and a sufficient insulating effect is often not obtained.

However, since the amount of organic binder used in the case of silver mica is generally much smaller than in the case of composite mica, the properties of the binder itself are not as important as the latter. A laminated mica sheet, such as a laminated mica sheet, is made by grinding mica into a fine powder and applying it to a paper machine, but a laminated mica sheet made only of mica does not have mechanical strength by itself. Because they are extremely weak, they cannot be used as they are, so they are usually reinforced with supporting materials such as cotton cloth, paper, synthetic fiber cloth, nonwoven fabric, glass cloth, etc.

In this case as well, the laminated mica sheet and the supporting material are usually bonded together using an organic binder, but the amount of this binder is generally much larger than in the case of silver mica. Therefore, its properties have a large influence on the properties of the insulating structure as a whole, and the properties of the binder itself are an extremely important issue. Furthermore, depending on the type of support material, the heat resistance is very low, and as mentioned above, mica is used to back the support material with a binder. There is a problem in that the tape becomes expensive. In addition, the binder must be non-sticky during use, have appropriate flexibility, maintain reactivity with the impregnated resin, and have excellent electrical properties, which is extremely difficult. Profit. It's difficult. Furthermore, since such conventional laminated mica thin film materials use a fairly large amount of organic binder, generally 8% or more, the impregnability of the resin is significantly deteriorated, which deteriorates the properties of the overall insulating structure. This is considered to be a serious drawback of laminated mica thin film materials. Furthermore, as mentioned above, since a large amount of organic binder is used, the heat resistance of mica thin film material is low, and there is a serious drawback that mica's extremely excellent heat resistance and insulation properties cannot be fully utilized. This invention was made as a result of various studies in order to improve the shortcomings common to the conventional mica thin film materials as described above, and has excellent impregnability, moderate flexibility, and The object of the present invention is to provide a laminated mica thin film material which has high mechanical strength, has superior heat resistance compared to conventional materials, and is inexpensive.

The laminated mica thin leaf material according to the present invention is characterized by being formed by bonding organic or inorganic fibrous bodies and laminated mica in a spot shape with a water-dispersible resin (hereinafter referred to as a water-dispersible binder). It is something.

The laminated mica thin sheet material according to the present invention can be produced by, for example, dispersing the fibrous body and the scale-like laminated mica in water, making paper using a paper machine or the like, and then applying a water-dispersed binder. It can be easily obtained by heating and pressurizing at a temperature below the temperature at which it deteriorates and decomposes.

When using the above-mentioned water-dispersed binder, in addition to the above-mentioned method, for example, (l) the aggregated mica and the fibrous material are immersed or sprayed in advance in the water-dispersed binder at an appropriate concentration, and then dried. (2) A method in which aggregated mica, fibrous material, and water-dispersible binder are dispersed in water and then paper-formed;
3) A method of uniformly spraying a water-dispersed binder with a sprayer or the like after forming the aggregate mica and the fibrous material is also considered, but the method is not limited to this method. The laminated mica thin sheet material of the present invention obtained as described above has a water-dispersed binder between the laminated mica pieces.
It is now possible to bond the aggregated mica pieces and the fibrous bodies and between the fibrous bodies in a spot-like manner, thereby improving mechanical strength without impairing impregnating properties. Since the content of the binder can be reduced to a small amount, it is possible to expect an improvement in heat resistance.

Furthermore, by mixing the fibrous material, in addition to improving mechanical strength, for example, when the present invention is used as an insulating tape, mica pieces may peel off during taping, and mica pieces may fall off at bent corners. It is also possible to extremely reduce cracks and the like, and furthermore, since supporting materials for reinforcement are not required, it is possible to provide the product at a much lower price than conventional products. The above-mentioned fibrous material is an organic material, such as natural or synthetic fibrous pulp,
Fifrilled natural or synthetic fibers, or a mixture of one or more natural fibers or synthetic fibers are used, and inorganic fibers, such as glass fiber, may be used alone or in combination with the above-mentioned organic fibers. They can be used in combination.

In particular, when glass fiber is used and the amount of water-dispersible binder is reduced, heat resistance can be further improved. Note that, from the viewpoint of electrical properties, it is desirable that the glass fiber is made from alkali-free glass, but is not limited thereto.

In addition, the dimensions of this glass fiber include a fiber length of 0.5 to 3.
0mm, fiber thickness 50μ or less, preferably length 2-15
mm, thickness in the range of 0.5 to 30 μm is suitable.
If the fiber length is 30 mm or more, it will be difficult to mix uniformly with the laminated mica fiber during papermaking, and it will be difficult to obtain a laminated mica thin sheet material in which glass fibers are uniformly dispersed, and if the fiber length is 0.5 mm or less, The mechanical strength is significantly reduced due to insufficient intertwining between the glass fibers and the assembled mica pieces, and the retention of the assembled mica pieces is insufficient, for example, when taping, the mica pieces and even the glass fibers are This is undesirable because workability is significantly deteriorated, such as a large number of particles falling off. Furthermore, if the fiber thickness is 50μ or more, the gaps in the thickness direction between mica pieces when mixed with laminated mica become large, and at the same time, the thickness of the entire thin material becomes thick, and entanglement between glass fibers becomes large. As a result, the mechanical strength and electrical properties are reduced, which is a serious drawback. Furthermore, if the glass fiber is thinner than 0.5 μm, the glass fiber itself becomes expensive, and as a result, the resulting composite mica thin film material also becomes expensive. The proportion of the above-mentioned fibrous bodies in the finished mica thin film material is 3 to 50.
(parts by weight, hereinafter the same) is appropriate, and 5 to 40 parts is particularly desirable.

If the proportion is more than 50 parts, the electrical properties, especially the corona resistance, of the resulting laminated mica thin film material will be significantly reduced, and if it is less than 3 parts, the mechanical strength will be reduced, and the laminated mica pieces will fall off. This is undesirable because workability is significantly deteriorated due to severe oxidation. However, the upper limit of the content of the fibrous material can be increased to 60 to 70 parts if there are no limitations in use due to the electrical properties described above.
Furthermore, the aforementioned water-dispersible binder includes synthetic resins with good heat resistance, such as epoxy resin, polyester, polyesterimide, polyesteramide, polyamideimide, phenolic resin, epoxy-modified phenol, silicone-modified phenol, polyurethane, epoxyurethane,
Water-dispersed varnish obtained by physically or chemically micronizing alkyd resin, polyimide, polybenzimidazole, aromatic polyamide, polyfluoroethylene, etc. alone or a mixture thereof, or monomers of the above synthetic resins, acrylonitrile, etc. By emulsion polymerizing one or more of nitrile monomers, acrylic monomers such as ethyl atarylate and methyl methacrylate, vinyl monomers such as styrene and vinyl acetate, or monomers such as butadiene and isoprene. Examples include water-dispersed varnishes obtained by

The content of the water-dispersed binder used in the dry assembled thin leaf material is preferably 0.5 to 15%, and particularly preferably 1.5 to 8%.

If the content of the water-dispersed binder is less than 0.5%, the mechanical strength of the paper produced will be poor, and the aggregated mica scales will fall off frequently, resulting in extremely poor workability during taping. If it exceeds 15%, resin impregnation becomes extremely poor and the mica tape loses its flexibility, which is a serious drawback. Hereinafter, the present invention will be explained in more detail with reference to Examples, Comparative Examples, and Reference Examples.

In these examples, unless otherwise specified, parts and percentages regarding the composition of the mica thin film material are based on weight.

Example 1 85 parts of scale-like laminated mica was mixed with 10 parts of synthetic polyester fiber.
part and freeness of approximately 90°S. R. After mixing 5 parts of natural kraft pulp and making paper using a paper machine, an epoxy water-dispersed binder (solid content concentration of about 5%) was uniformly sprayed using a sprayer to make paper.The pressure was 10 kg/Cll2 and the temperature was about 1.
A pressure and heat treatment was performed at 50° C. for 15 to 30 minutes to produce a composite mica thin film material with a binder content of 4.5%.

The tensile strength of this thin sheet material is approximately 4 kg/Mm",
For comparison, the freeness of 90°S. R. The tensile strength was approximately 2.1 times the tensile strength of the pulp mica thin material consisting of 5 parts of natural kraft pulp, 10 parts of synthetic polyester fiber, and 85 parts of scale-like aggregated mica, which was approximately 1.9 kg/Mm. is approximately 1.8%, which is significantly larger than the approximately 0.8% of the above-mentioned pulp mica thin sheet material, which means that when this thin sheet material is used as a tape, it is much easier to tape than conventional ones. When this thin sheet material was actually taped to a rectangular copper wire and impregnated with epoxy resin, there was very little flaking of the mica during taping, and there was almost no unevenness of the mica at the corners. The workability of taping was extremely good, and the resin impregnation was also extremely good.Example 2 90 parts of scale-like aggregated mica was mixed with 10 parts of fifurlylated polyamide.
A water-dispersed polyester binder was added to this mixture, and the mixture was made into a paper using a paper machine, followed by pressure and heat treatment to produce a laminated mica thin film material having a binder content of 3%.

The tensile strength of this thin sheet material is approximately 4.5 kg/Mm'', and the tensile strength of the fifurly marker thin sheet material prepared for comparison, which is made of 10 parts of fifurlylated polyamide and 90 parts of laminated mica, is 2.2 kg/Mm. "It was about twice that amount."

In general, in composite insulators impregnated with resin, the quality of the impregnation is determined by TanΔH, that is, the dielectric loss tangent TanδA when a certain high voltage is applied to the impregnated material, and the occurrence of corona discharge due to minute voids in the impregnated material. This is determined by the difference in dielectric loss tangent Tan δB when a low voltage is applied, and the Tan δ value at room temperature of a composite insulator made by taping this laminated mica thin film material to a rectangular copper wire and impregnating it with epoxy resin. When I measured the voltage characteristics of 6k
Dielectric loss tangent Tanδ when applying an AC voltage of v/Mm
(6kv/Mm) is 0.75% and 0.5kv/Mm
Tanδ (0.5kv/Mm) for a voltage of m is 0
．． It was 42%.

Therefore, TanΔH=Tanδ (6kv/Mm)−
Tanδ (0.5kv/Mm)=0.33%,
This value is TanΔH = 2.02 when using a composite mica thin sheet material using only an ordinary solvent-based organic binder.
% - 0.72% = significantly lower than 1.30%,
It can be seen that this thin sheet material has significantly better resin impregnation properties than the conventional laminated mica thin sheet material. Example 3 After pretreatment with an acrylic copolymer water-dispersed binder, 15 parts of polyester prepared by fifurlating 70 parts of redispersed scale-like mica and 15 parts of polyamide short fibers were mixed, and the mixture was made into paper using a paper machine. A tape-shaped laminated mica thin film material with a binder content of 8% was produced by pressure and heat treatment.

The tensile strength of this mica tape was approximately 4.3 kg/Mm'', which was very good, and the microwave impregnating property was also very good.Example 4 90 parts of scale-like aggregated mica was mixed with 5 parts of vinylon fifryl After mixing with 5 parts of aromatic polyamide fiber and making paper using a paper machine, an epoxy water-dispersed binder (solid content concentration of about 3%) is uniformly sprayed, and a pressure and heat treatment is performed to determine the binder content. A 3.6% tape-shaped laminated mica thin material was made.

The tensile strength of this mica tape was very good, about 4 kg/Mm'', and the resin impregnation was also very good.Example 5 80 parts of scale-like aggregated mica, 10 parts of polypropylene synthetic pulp and beaten Kraft pulp 1 with a degree of about 80' S.R.
After mixing 0 parts and further adding a polyurethane water-dispersed binder and making paper using a paper machine, heat and pressure treatment was performed to produce a tape-shaped laminated mica thin film material with a binder content of 6%.

The workability of this mica tape during taping was extremely good, and the impregnability with the resin was also very good. Example 6 60 parts of scale-like laminated mica, 10 parts of aromatic polyamide fifryl, and 30 parts of polyester fibers were mixed, and a polyester water-dispersed binder was further mixed in to form a paper using a paper machine, followed by pressure and heat treatment. A tape-shaped laminated mica thin film material with a binder content of 4.6% was prepared by performing the following steps.

The workability of this mica tape during taping was extremely good, and the impregnability with the resin was also very good. Example 7 After mixing 95 parts of scale-like aggregated mica and 5 parts of aromatic polyamide fifryl and making a paper using a paper machine, a polyamide-imide water-dispersed binder was uniformly sprayed and then heated and pressurized. Binder content: 5%
I made a composite mica tape.

The tensile strength of this mica tape was very good, about 4.6 kg/Mm2, and the resin impregnation property was also very good. Example 8 80 parts of scaly laminated mica and a beating degree of about 80°S. R. 10 parts of polyester-based synthetic pulp and 10 parts of natural short hemp fibers were mixed and made into a paper using a paper machine, and then a styrene-butadiene copolymer water-dispersed binder (solid content concentration of about 6%) was mixed with a brush. A composite mica thin film material having a binder content of 4.3% was prepared by applying the same method and then subjecting it to heat and pressure treatment.

Example 9 70 parts of scale-like aggregated mica, 25 parts of polypropylene fifryl, and a beating degree of about 25°S. R. After mixing 5 parts of Manila hemp pulp and making paper using a paper machine, acrylonitrile-
A composite mica tape having a binder content of 1.0% was prepared by uniformly spraying a methacrylic acid ester copolymer-based water-dispersed binder and then performing pressure and heat treatment.

Example 10 65 parts and 20 parts of scaly laminated mica and vinylon staple fibers pretreated and redispersed with a polyesterimide-based water-dispersed binder, respectively, were mixed with a freeness of about 30°S. R
．． After mixing with 15 parts of Manila hemp pulp and making paper using a paper machine, the binder content is 1.
I made a 0% laminated mica tape.

Example 11 85 parts of scale-like aggregated mica, 5 parts of aromatic polyamide fifryl, and 10 parts of aromatic polyamide fiber were mixed, and after papermaking, an epoxy urethane water-dispersed binder was uniformly sprayed, and then pressure and heat treatment was performed. So, the binder content is 3.8
% laminated mica tape was made.

Taping workability when wrapping the laminated mica tapes produced in Examples 3 to 11 described above around rectangular copper wire, and composite insulators made by impregnating the taped laminated mica tapes with epoxy resin. Table 1 summarizes the dielectric loss tangent.

In Table 1, mica peeling property in the workability column refers to the ease with which mica pieces fall off during taping, and mica roughness refers to the degree of mica peeling and cracking at corner cracks. Comparative Example 1 After making scaly laminated mica using a paper machine, about 10
kg/Crff and pressurized and heated at about 150° C. for 15 to 30 minutes to produce a composite mica thin sheet material.

Next, a binder prepared by dissolving an epoxy adhesive in an organic solvent was brushed onto this thin sheet material, and the material was backed with insulating paper having a thickness of 0.05 mm to produce a mica tape having a binder content of about 10%. Comparative Example 2 70 parts of scaly laminated mica and 90°S. R. A laminated mica thin sheet material having an epoxy adhesive binder content of 4.9% was prepared in the same manner as in Reference Example-1.

Reference example 1 98 parts of scale-like laminated mica, thickness of about 15μ, length of about 10
After mixing with 2 parts of glass fine fibers of 1.5 mm in diameter and suspending them in water and making paper using a paper machine, a heat-resistant polyester water-dispersible binder was uniformly applied with a brush, and then the water-dispersible binder was A laminated mica thin sheet material having a binder content of 4.5% was produced by performing pressure and heat treatment to a degree that did not cause deterioration.

Reference example 2 40 parts of scale-like laminated mica and fine glass fiber (
After mixing 60 parts of (approximately 20μ in thickness and approximately 8mm in length) and forming the paper in the same manner as in Reference Example-1, a polyesterimide-based water-dispersed varnish was uniformly sprayed, and a pressure and heat treatment was performed to form a composite mica. A thin leaf material was prepared.

Reference example 3 75 parts of scale-like laminated mica and fine glass fibers (thickness approx. 30 μm)
, approximately 35 mm in length) to produce a composite mica thin film material in the same manner as in Reference Example 1, but the glass fine fibers were not uniformly dispersed and a uniform mica tape could not be obtained. .

Table 2 summarizes the characteristics of the samples obtained in the above comparative examples and reference examples.

Examples in which glass fibers are used as the fibrous body are given below and explained in comparison with the above-mentioned comparative examples and reference examples.

Example 12 80 parts of scale-like laminated mica, about 3 μm in thickness and about 3.5 μm in length. 6m
After mixing with 20 parts of glass fiber of 500 m and suspending it in water and making paper using a paper machine, an epoxy-modified phenolic water-dispersible binder was uniformly sprayed with a sprayer at a pressure of about 10 m.
kg/Cmt, pressurized at a temperature of approximately 150°C for 15 to 30 minutes,
Heat treatment is performed to reduce the binder content. A 4.2% laminated mica foil material was prepared.

Note that this paper-making, pressurization, and heat treatment can be performed continuously, and it is also possible to uniformly press and heat with a rotating heat roller or the like. The pressure and heating may be selected as appropriate, taking into account the thickness of the product, the papermaking speed, the difficulty of dewatering, etc., but in the examples, the range of 5 kg/Cnf to 20 kg/- is used, and the heating temperature also depends on the thickness of the product, the dewatering process, etc. may be selected appropriately taking into account the difficulty of drying, the type of binder and organic solvent, the papermaking speed, etc., but in this example, about 100°C to 350°C was used. In addition, during heating, it is necessary to adjust the temperature and papermaking speed so as not to deteriorate and decompose the heat-resistant organic binder used. When the thin sheet material produced as described above was taped to a rectangular copper wire and impregnated with epoxy resin, very little mica pieces fell off during taping, and there was almost no unevenness or cracking of the mica at the corners. Moreover, the tape was not sticky, and the workability of taping was extremely superior to that produced in Comparative Examples 1 and 2, and the impregnating property with resin was also extremely excellent.

Furthermore, when the glass transition temperature of the composite insulator made by impregnating this epoxy resin was measured with a direct reading viscoelastic spectrometer, it was 145°C, which was significantly higher than that of Comparative Examples 1 and 2. It is shown that the heat resistance of the mica composite insulation is significantly improved by using fibers and reducing the amount of binder used. In addition, although the amount of binder used is less than that of conventional mica tape, the tensile strength is 4.7 kg/Mm'', which is almost comparable to that of Comparative Example-1, which was backed with insulating paper. , and can be sufficiently used without buffing of other reinforcing materials.Example 13 95 parts of scaly mica were mixed with 5 parts of glass fiber (approximately 0.5 μm in thickness and approximately 15 mm in length), After suspending in water and adding a modified epoxy water-dispersible binder to this suspension, a laminated mica thin sheet material having a binder content of 8% was produced in the same manner as in Example-12.

The tensile strength of this thin material is approximately 4.5 kg/Mm'', which is slightly inferior to that of Comparative Example-1, which was backed with insulating paper, but Comparative Example-2, which contained pulp used only in mica tape. Furthermore, the elongation at break was approximately 1.5%, which was also superior to Comparative Example 2, which means that when using this thin sheet material as a mica tape, it It shows that it is more stretchable and much easier to tape.The composite insulator made by impregnating the laminated mica thin sheet material prepared here with epoxy resin in the same manner as in Example 12 has a tan resistance at room temperature.
When the voltage characteristics of δ were measured, the dielectric loss tangent Tanδ (6kv/Mm) was 1 when 6kv/Mm alternating current was applied.
．． 08% and Ta at a voltage of 0.5kv/Mm
nδ (0.5kv/Mm) was 0.59%.

Therefore, Tanδ (6kv/Mm) − Tanδ (a)
．． 5kv/Mm) 0.49%, and this value is -
It is very low compared to that of No. 1, and it can be seen that this thin sheet material has significantly better resin impregnation than the conventional laminated mica thin sheet material. The value of the dielectric loss tangent TanΔH is almost the same as that of Comparative Example-2 in which tallaf pulp was mixed. is very good. Further, the glass transition temperature of the composite insulator impregnated with this epoxy resin was measured in the same manner as in Example 12, and found to be 147°C. This value is significantly higher than that of Comparative Examples 1 and 2, indicating that heat resistance is significantly improved by using glass fiber. In addition, the mechanical strength is slightly inferior to that of mica tape backed with insulating paper (Comparative Example-1), but it is much stronger than the pulp-reinforced mica tape used alone (Comparative Example-2). Therefore, it can be used without backing, and the price of the mica tape can therefore be much lower than conventional ones. Example 1
4 Mix 75 parts of scale-like laminated mica with 25 parts of glass fiber (approximately 8 μm in thickness and approximately 12 mm in length), form the paper in the same manner as in Example 12, and then uniformly apply a polyesteramide water-dispersible binder with a brush. A pressure and heat treatment was performed to produce a thin sheet material having a binder content of 2.6%.

The tensile strength of this mica tape was 4.3 kg/Mm2, which was very good, and the resin impregnation property was also very good. Example 15 60 parts of scale-like laminated mica was mixed with glass fiber (approximately 20μ thick,
Mix 20 parts of fine glass fibers (approximately 3μ in thickness and approximately 6mm in length) that have been pretreated with a polyester water-dispersed binder and then redispersed by a crushing method etc. After papermaking, pressurization and heat treatment were performed in the same manner as in Example 12 to produce a laminated mica thin sheet material with a binder content of 1.5%.

Example 16 50 parts of scale-like aggregated mica was pretreated with 20 parts of glass fiber (approximately 8 μm in thickness, approximately 12 mm in length) and an aromatic polyamide water-dispersible binder, and then redispersed by a method such as pulverization. Example-
After papermaking, pressurization and heat treatment were performed in the same manner as in No. 12 to produce a laminated mica thin sheet material having a binder content of 3.5%.

Example 17 90 parts of scaly laminated mica and glass fiber (approximately 25μ thick,
After papermaking in the same manner as in Example 12, the polyesterimide water-dispersible binder was uniformly sprayed and then subjected to pressure and heat treatment to obtain a binder content of 6. .3% laminated fiber material was prepared.

Example 18 70 parts of scale-like aggregated mica and 30 parts of glass fibers (approximately 30 μm in thickness and approximately 5 mm in length) that had been pretreated and redispersed with a polyacrylonitrile-based water-dispersible binder were mixed to produce Example- After papermaking in the same manner as in No. 12, a pressure and heat treatment was performed to produce a laminated mica thin sheet material with a binder content of 1.9%.

Example 19 65 parts of scale-like laminated mica and fine glass fibers (thickness: about 3μ,
35 parts of the paper (length: 6 mm) were mixed and formed into a paper in the same manner as in Example 12. The paper was then covered with a fine wire mesh and gently immersed in a silicone-modified phenolic water-dispersed binder, followed by pressure and heat treatment. As a result, a laminated mica thin film material having a binder content of 4.8% was prepared.

The tensile strength and elongation at break of the laminated mica tape produced in Examples 12 to 19 described above, the taping workability when wrapping it around a rectangular copper wire, and the fabrication by impregnating the taped mica tape with epoxy resin. Table 2 shows the dielectric loss tangent TanΔH of the ivy composite insulator and its glass transition temperature.
Shown below.

Claims (1)

[Scope of Claims] 1. A laminated mica thin sheet material produced by bonding a laminated mica and a fibrous body using a water-dispersible resin. 2 97 to 50 parts by weight of aggregated mica to 3 parts by weight of fibrous material
The laminated mica thin film material according to claim 1, which contains a water-dispersible resin of 0.5 to 15% by weight based on the total weight. 3. The laminated mica thin sheet material according to claim 1 or 2, wherein an organic fibrous material is used as the fibrous material. 4. The laminated mica thin sheet material according to claim 3, wherein pulp is used as the organic fibrous material. 5. The laminated mica thin sheet material according to claim 3, wherein fibrillated fibers are used as the organic fibrous material. 6. The laminated mica thin sheet material according to claim 1 or 2, wherein inorganic fibers are used as the fibrous bodies. 7. The laminated mica thin film material according to claim 6, wherein glass fiber is used as the inorganic fiber. 8. The laminated mica thin sheet material according to claim 7, wherein glass string fibers having a fiber thickness of 0.5 to 50 μm and a fiber length of 0.5 to 30 mm are used as the glass fibers.