Method for manufacturing sheet-like gasket

A manufacturing method and gasket technology, applied in the direction of chemical instruments and methods, flat products, engine sealing, etc., can solve the problems of reduced tensile strength, reduced plate-making performance, and increased stress relaxation, etc., to achieve small stress relaxation, The effect of reducing the tensile strength is small

Inactive Publication Date: 2007-09-12
NICHIAS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, when an organic fiber such as aramid fiber, which is fibrillated like asbestos, is used as the base fiber used in the NA gasket, the fiber diameter of the organic fiber is larger than that of the asbestos fiber, and heat resistance It is also inferior in heat resistance and steam resistance, so its usage is usually limited to about 5 to 15% by weight
In addition, when inorganic fibers such as rock wool, carbon fiber, and glass fiber are used as the base fiber, the inorganic fiber is harder than the asbestos fiber and has a thicker fiber diameter, so the fiber is easily broken during mixing or board making. When the amount of fiber is increased, when the material is laminated on the side of the hot roll by the calender roll, the so-called pit phenomenon in which the material adheres to the surface of the cold roll occurs, and the plate making performance is significantly reduced, so its usage is often limited to 10~ About 30% by weight
Therefore, compared with asbestos gaskets, NA gaskets have the characteristics of less fiber content and a larger mixing ratio of filler materials. Less filling material and more, so it is easy to become brittle, resulting in the problem of lower tensile strength or greater stress relaxation
In addition, non-asbestos-based sheet gaskets using hydrogenated nitrile rubber or nitrile rubber as rubber exhibit excellent properties in terms of normal physical properties and oil resistance, but the amount of rubber compounded has to be increased in order to maintain these properties. , in this case, if the combined hydrogenated nitrile rubber or nitrile rubber ages, the stress relaxation will become larger, and the long-term sealing performance will not be sufficient
Therefore, conventional NA gaskets cannot be used in high-temperature fields like asbestos gaskets.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Table 1 and the base fiber, rubber, rubber chemicals, filler, and toluene shown in Table 1 and the following physical properties were mixed with a Henschel mixer at a low rotation speed for 20 minutes to prepare a mixed material. After that, the obtained mixed material was put between a hot roll heated to 150° C. and a cold roll kept at 20° C., and pressed and vulcanized while being laminated on the hot roll side to obtain a thickness of 1.5. mm of NA sheet spacers. In addition, the input amount of each raw material in the mixed material was adjusted so that the composition of the finished NA sheet-like gasket became the ratio shown in Table 1. The unit of data in Table 1 is % by weight. In addition, the compounding of latex is the data converted into solid content.

[0029] HNBR latex refers to a latex of hydrogenated nitrile butadiene, and is a commercially available product with a total solid content of 40%, a pH of 11, a viscosity of 20 mPa·s, and an average parti...

Embodiment 2～3

[0032] Using the compounding materials shown in Examples 2 to 3 in Table 1, NA sheet-like gaskets having a thickness of 1.5 mm were manufactured in the same manner as in Example 1, and the same evaluation items were measured. The results are shown in Table 2.

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PUM

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Abstract

A non-asbestos sheet-like gasket usable at a high temperature, exhibiting only a small decrease in tensile strength and stress relaxation under high temperature conditions is provided. The method for manufacturing the sheet-like gasket comprises a step of obtaining a sheet-forming composition comprising a base fiber other than asbestos, a latex of hydrogenated acrylonitrile-butadiene, a filler, and rubber chemicals and a step of obtaining the sheet-like gasket by molding the composition and vulcanizing the rubber.

Description

technical field [0001] The present invention relates to a method of manufacturing a non-asbestos sheet gasket (hereinafter also referred to as NA gasket) used in a wide range of fields such as petrochemical machinery, various industrial machinery, automobiles, ships, and home appliances. Background technique [0002] Gaskets, which are general sheet-like gaskets, are produced by the following method. That is, after adding rubber dissolved in a solvent to base fibers, fillers, and rubber chemicals, they are thoroughly mixed with a Henschel mixer to prepare a mixed material composition, and then the mixed material composition is put into Between a pair of calender rolls consisting of a hot roll heated to about 150°C and a cold roll kept at about 20°C, the solvent is evaporated and vulcanized while laminating on the hot roll side, and peeled off from the hot roll to a predetermined thickness spacers. [0003] Conventionally, asbestos-based gaskets have been widely used as gas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K3/10F16J15/10
CPCF16J15/108F16J15/102C09K3/1028B29D7/01
Inventor 糸井克丰齐藤浩史
Owner NICHIAS CORP
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