JPS59212252A - Manufacture of aggregate mica laminate - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a mica laminate used for, for example, heat-resistant noncombustible materials, electrical insulating materials, special V heater plates, insulating spacers, insulating washers, heat insulating members, etc. .

In the conventional manufacturing method of a composite mica laminate, generally, a composite mica sheet is coated with an organic liquid bond material such as epoxy resin or silicone resin, or a liquid bond without sintering such as 972 or metal phosphate. Create a tabletop by applying and impregnating the material. A method is known in which the veneers are stacked to a predetermined thickness and then heated and pressed using a press equipped with a hot platen to form a mica laminate.

However, in the above manufacturing method, liquid bond materials are limited, and many have excellent heat resistance and nonflammability, and it is necessary to manufacture using powder bond materials that have a wide range of properties.

However, a laminated mica sheet is a sheet in which mica powder is piled up, and in the case of a liquid bond material, it is possible to impregnate the laminated mica sheet relatively easily by adjusting the viscosity. In the case of a powdered bond material, the powdered bond material melts and impregnates the inside of the assembled mica sheet when heated and pressed.

That is, during hot-press molding, the process of melting the bond material, impregnating it into the assembled mica sheet, and binding it is performed simultaneously. For this reason, when pressure molding does not go well, poor adhesion occurs between the layers of the laminated mica sheet.
Even slight bending caused defects such as peeling, which caused problems in terms of strength.

This IA was made in order to eliminate the above-mentioned drawbacks, and includes a step of providing a plurality of through holes in the laminated mica sheet, and a step of applying one sheet of powdered bonding material to the laminated mica sheet. , if the above-mentioned collected information was taken
A powder bond material with excellent heat resistance and non-combustibility and a composite mica sheet are produced by laminating them to a predetermined thickness and molding the laminated mica sheets by heating and pressing. The object of the present invention is to obtain a method for producing a mica laminate having desired properties and good interlayer adhesion by integrating the mica sheets.

An embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows a mica sheet assembly 111. FIG. As shown in Fig. 2, a plurality of through holes (2
) will be established. FIG. 8 shows a front view of a mica sheet assembly (1) provided with through holes (2), and FIG. 4 shows an enlarged sectional view. (3) is mica powder, actually mica powder (3)
The layers are stacked in parallel to form a composite mica sheet (l). All of the powder bonding material is sprinkled onto the assembled mica sheet (1) provided with the through holes (2). Next, several spread mica sheets m are laminated to a predetermined thickness, and then heated and pressed using, for example, a press equipped with a hot platen to obtain a mica laminated body. In conventional manufacturing methods, even if the powder bond material melts during hot-press molding, the mica powder (3) forms parallel layers, which acts as an obstacle and prevents the bond material from impregnating. was. However, by providing the through holes (2) as in the present invention, the bond material already enters the through holes (2) when being sprayed on the assembled squid sheet 111, making it easier to enter between the layers of the mica powder (3). , it becomes easier to impregnate.

An actual example will be described in more detail below.

Ill f
1m 500mm.

Cut to length 500 = 1m, y of approximately 500μ
(Five sheets with through holes (2) provided at a ratio of 18/d were prepared. One sheet of assembled micacy) 1llO car MId'
It was about 502. Next, each collective micacy) +1
Compositions 9'a and 'lf consisting of 60 w% of orthophosphoric acid as a powdered bond material and 40 w% of zinc as a =C organic filler powder were sprayed onto 1 using a vibrating powder spreader. 5
The sheets were sequentially laminated using VC. It is sandwiched between 8.2M thick steel plates with 50μ thick Teflon sheets on the top and bottom. Insert this together with the iron plate between the hot plates heated to 180°C to 200°C, and immediately apply pressure of 401 to 50 - 1 for 20 to 3 minutes.
The molding was done by heating and pressuring for 0 minutes.
After cooling and reaching 50℃, the pressure was released and the thickness was 9.4℃.
It threatened a mica laminate with a width of 500 mm and a length of 500 mm.

The assembled mica laminate obtained by this method was cut to a width of 50 mm and a length of 200 am, and both ends were held and bent to examine the interlayer handleability until the laminate was destroyed. The cross section when W is destroyed without forming is the same state as when it was cut, and there is complete contact between the layers of mica powder.
.

- 10,000, When a mica laminate produced in the same manner as in the above-mentioned example without providing the through hole (2) was examined in the same manner as above, it was found that:
When it was bent along a circumference of about 200 mm, the layers broke apart and made a sound.

The present invention is not limited to the above-mentioned embodiments, and the present invention is not limited to the above-mentioned embodiments.・When used in parallel, an aggregated mica phase layered body with even better heat resistance can be obtained.

There are other powdery bond materials KJ″j: There are a wide range of properties compared to liquid bond materials, and although the bond material alone is sufficiently effective, By integrating it with the assembled magnetic sheet, it is possible to obtain products with characteristics suitable for various uses.

The through holes (2) can be set in an appropriate number and diameter depending on the properties and particle size of the powdered bond material, as well as the nature, particle size, and ratio of the inorganic filler powder to the bond material. It can be provided in Further, even if the process of forming one through hole (2) in the mica sheet assembly ti'+ and the process of dispersing powdered pound material are performed simultaneously, the same effect as in the above embodiment can be obtained.

As described above, the steps include forming a plurality of through holes in the laminated mica sheet, scattering powdered bond material on the laminated mica sheet, and spreading the sprinkled base mica sheet to a predetermined thickness K. By carrying out the process of forming the laminated mica sheets and the process of heating and pressing the laminated mica sheets to form them, it is possible to obtain a mica layered body with good adhesion and suitable for various uses. effective.

[Brief explanation of drawings]

Figure 5 is a sectional view showing a conventional laminated mica sheet, Figure 2 is a sectional view showing a laminated mica sheet after through-holes are provided according to an embodiment of the present invention, and Figure 8 is a front view of Figure 2. figure,
FIG. 4 is an enlarged sectional view of FIG. 2. In the figure, IIL-laminated mica sheet (2 holes are shown). In the figure, the same reference numerals indicate the same or equivalent parts. Agent: Masuo Oiwa

Claims (1)

[Claims]) 1) A step of providing a plurality of through holes in the laminated mica sheet, a step of sprinkling powdered bond paulownia material on the laminated mica sheet, and forming the sprinkled laminated mica sheet into a predetermined thickness. 1. A method for producing a mica laminate, which comprises the steps of: laminating the mica sheet metal so that the metal sheet is laminated, and molding the laminated mica sheet metal by heating and pressing. (2) The scope of the patent MMR is characterized in that after the step of forming a plurality of page holes in the laminated mica sheet, a powdered bonding material is sprinkled on the laminated mica sheet. A method for manufacturing the mica laminate described above. +31 A method for manufacturing a mica laminate according to claim 1 or 2, characterized in that a powdered bond material and an inorganic filler powder are sprinkled on a mica sheet assembly.