JPS62295983A - Filler material for spiral gasket - Google Patents

Abstract

PURPOSE:To obtain the title filler material having excellent resistance to heat and vibration, by blending a fiber base material composed of a combination of at least two types of glass fibers having different fiber diameters with a clay mineral and a binder and then molding the blend. CONSTITUTION:A fiber base material composed of a combination of at least two types of glass fibers having fiber diameters of 2mum or less and 2mum or more is blended with a filler such as a clay mineral (e.g., talc) and a binder (e.g., acrylonitrile.butadiene rubber). The blend is formed into sheet and cut into a tape form. This provides a filler material for spiral gasket which exhibits little performance degradation against heating at a medium to high temp. range (400-700 deg.C) and vibration and which can be suitably employed in pipe joints through which high-temp. sealed fluid is fed.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention (a) Field of the Invention The present invention is applicable to high-temperature sealed fluids such as water, LNG, N2 gas, and especially exhaust gas such as in the exhaust pipes of automobiles. The present invention relates to a filler material for a spiral layer gasket that is used by being disposed at a pipe joint for supplying water.

(b) Background of the Invention Conventionally, the spirally wound layer gasket of the above-mentioned example has, for example,
There is a gasket described in Japanese Patent Publication No. 47-42426.

That is, it is a spiral layer gasket constructed by winding a metal strip (hoop material) with a bent shape such as a V-shape or wave shape in cross section and a strip-shaped filler material multiple times in a spiral shape.

However, the filler material of the spiral layer gasket mentioned above has
Since asbestos fibers are used, although they have good sealing properties, they have the following production problems.

In other words, due to its nature, asbestos tends to generate a lot of dust when handled, and if this dust is continued to be inhaled over a long period of time, asbestos dust may be deposited in the lungs, and long-term use of asbestos may cause asbestos dust to be deposited on the skin. Dust adhesion caused asbestos disease, mesothelioma, lung cancer, and other problems, which were extremely unfavorable from a sanitary standpoint.

In order to solve these problems, for example, the patent application filed in 1983
As shown in No. 62286, there is an asbestos-free filler material using inorganic fibers other than asbestos fibers.

The above-mentioned filler material is a filler material for spiral wound layer gaskets, which is made of inorganic materials other than asbestos fibers as a base material and contains Seviolite, and can be used suitably as a substitute for asbestos filler materials. It has the advantage of having better properties than asbestos filler materials.

However, the above-mentioned filler materials have a problem in that their properties deteriorate, especially when used in a medium to high temperature range, for example, 400 to 700° C., and when the attachment location vibrates.

(c) Purpose of the Invention The present invention provides a filler for spiral-wound layer gaskets that exhibits very little deterioration in characteristics even when subjected to heating and vibration, particularly in the medium-to-high temperature range (400 to 700°C), and has excellent heat resistance and vibration resistance. The purpose is to provide materials.

(d) Summary of the Invention This invention provides a fiber N base material that is a combination of two or more types of glass II fibers having a fiber diameter of 2 μm or less and glass fibers having a fiber diameter exceeding 2 μm, filled with clay minerals, etc. The present invention is characterized in that it is a filler material for a spirally wound layered gasket l-, which is made by blending it with a material and a binder.

(e) Effect of the invention According to this invention, as the uutt base u of the filler material,
Glass vaN with a fiber diameter of 2 μm or less and 2 μm
Because it is combined with glass fiber with a fiber diameter exceeding
The above-mentioned glass fibers with a fiber diameter exceeding 2 μm prevent the strength from decreasing during heating, and the glass fibers with a fiber diameter of 2 μm or less prevent clay minerals used as a filling material from falling off due to vibration. In particular, there is very little deterioration of the characteristics even when subjected to heating and vibration in the medium-to-high temperature range of 400 to 700°C, and there is an effect of excellent heat resistance and vibration resistance.

(F) Embodiment of the Invention The filler material in this embodiment is glass fiber having a fiber diameter of 2 μm or more. 7% by weight of micro glass with a diameter of 0.6 μm, 10% by weight of glass fiber with a fiber diameter of 6 μm as glass w4 navy blue with a fiber diameter exceeding 2 μm, talc as a clay mineral (natural hydrous magnesium silicate, paper 45% by weight of 45% of filler, 25% of clay mineral, Seviolite (a natural clay mineral whose main components are silicate and magnesium oxide), and cellulose bulb were suspended. 5% by weight of acrylo-nitributadiene-butadiene rubber (NBR) as a binder and 1% by weight of a coagulant.
et formir+g) L/, thickness 0°4I! u
R1 bulk density (about 0.7g/cm3) is made from fR machine paper cut into a tape with a width of 15 #I. be.

J3, bulk E glass with a fiber diameter of 0.6μ7n manufactured by Nippon Sheet Glass Co., Ltd., rMLF3AJ, manufactured by Nippon Sheet Glass Co., Ltd., is used as the above-mentioned microglass, and as the 6μm glass, RMLF3AJ manufactured by Nippon Sheet Glass Co., Ltd., with a fiber length of 3Hn, is used as the 6μm glass. E
Glass was used, the talc used was ``ND'' talc powder manufactured by Nippon Talc Co., Ltd., and the Seviolite was ``ND'' talc powder manufactured by Take III Products Co., Ltd.
IC using Needplus SPJ powder.

In addition, in order to compare and contrast the characteristics of the filler material of the example and that of the conventional product, we prepared a comparison amount A that does not contain microglass and a comparison amount B that does not contain 6μ glass fiber, as shown in Table 1 below. did.

Table 1> Mechanical strength, particularly tensile strength, tests were conducted on the filler materials of the above-mentioned examples and comparative amounts A and B, and the results shown in Table 2 below were obtained.

In addition, this tensile strength test was conducted at a tensile rate of 2 for each filler material.
00I! This was done by pulling at a/l1lin. In addition, in order to change the temperature conditions, we conducted a tensile strength test using each filler material at room temperature and after heating to 400°C and 600°C, and immediately after 10 hours had passed while maintaining these temperatures. I did it.

Table 2 From this test result, regardless of the temperature conditions, the filler material of the example has a comparative amount A that does not contain glass fibers with a fiber diameter of 2μ7n or less, and a glass fiber with a fiber diameter exceeding 2μ7n. It can be seen that the tensile strength and mechanical strength are superior when compared to either of the comparison amounts B, which does not contain fibers, and the tensile strength of the comparison amounts △ and B increases rapidly as the acceleration temperature increases. In contrast, there was no such change in the filler material of the actual flow example, confirming that the filler material of this example has excellent heat resistance. This is thought to be due to the fact that the 6 μm glass fiber as the glass JMIt exceeding 2 μm prevents the strength from decreasing during heating.

In addition, a spiral wound gasket with a predetermined inner diameter and a predetermined outer diameter was manufactured using the filler material of the above-mentioned example, and a spiral gasket with the same dimensions was manufactured using the same hoop material and the filler material of the comparative amount A and 8 described above. When a spiral gasket was manufactured and a comparative test was conducted on the amount of fluid leakage after vibration, the results shown in Table 3 were obtained.

This performance test was conducted using a 50-ton universal testing machine with a clamping pressure of 200 Kgf/ci, using N2 gas at a rate of 0.5 to 3/ci as a sealing fluid, and measuring leakage m.
A measuring cylinder was used as the measuring device. In addition, in order to change the temperature conditions, the amount of leakage was measured using each spiral gasket at room temperature at the time of initial tightening and each spiral gasket immediately after heating to 600° C. for 3 hours. Furthermore, the vibration frequency is 66.7112. Leakage was measured using each spiral-wound gasket immediately after being subjected to vibration acceleration of 110°7 m/s2 for a total of 4 hours.

Table 3 From this test result, the amount of leakage in the spiral gasket using comparative amount A of filler material increased rapidly due to vibration, and the spiral gasket using comparative amount B of filler material showed a rapid increase in the amount of leakage due to vibration. The leakage ω increases rapidly in response to vibration16, but the spiral-wound gasket using the filler material of the example does not exhibit a sharp increase in the leakage a in both medium and high temperature heating and imaging. It was confirmed that it has an excellent effect on vibration.

Here, the above-mentioned characteristics for imaging are due to the fact that 0.6 μm microglass as glass fiber having a fiber diameter of 2 μm or less prevents the filling material (clay mineral) from falling off due to vibration.

In other words, when the above-mentioned microglass is heated, it tends to reduce the fiber surface area, and when this microglass is heated and shrinks, the ability to capture clay minerals as a filler decreases. Zaru.

Therefore, by using microglass as tHI 73 U, a filler material with excellent vibration resistance can be obtained.

Furthermore, glass II with a diameter of 6μIrL has less thermal deterioration than the above-mentioned microglass, so by using glass II with a diameter of 2μm or more as a fiber base material, a filler material with excellent heat resistance can be obtained. By combining the above-mentioned microglass with glass fibers having a diameter of 2 μm or more, it is possible to create a filler material that is resistant to heating and imaging.

In addition, the operating temperature is 400 to 700 based on various test data.
Table 4 below shows the desirable combination of glass tin fibers with respect to °C.
It is as follows.

Table 4: As clay minerals, in addition to the above-mentioned talc and seviolite, kaolin (a white clay whose main component is kaolinite, a heat-resistant material that becomes relami-like at about 800°C) was added at a predetermined weight percent (preparation). Of course, you can do it.

Claims (1)

[Claims] Glass fibers with a fiber diameter of 1.2 μm or less and 2 μm
A filler material for a spiral-wound layer gasket made by mixing a fiber base material, which is a combination of two or more types of glass fibers with a fiber diameter exceeding , with a filler such as a clay mineral and a binder.