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Non-asbestos gasket sheet

A non-asbestos, sheet-like technology, used in the field of non-asbestos sheet-like gaskets, can solve the problems of poor heat resistance and steam resistance, reduced plate-making properties, inability to maintain tensile strength, etc. will reduce the effect of good sealing

Inactive Publication Date: 2006-07-19
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 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 the resistance Heat and steam resistance are also poor, 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 base fibers, the inorganic fibers are harder than rock wool fibers and have a thicker fiber diameter, so the fibers are easily broken during mixing or board making. If the amount of fiber is increased, when the material is laminated on the side of the hot roll by calender rolls, a so-called clogging phenomenon in which the material adheres to the surface of the cold roll occurs, and the plate making property is significantly reduced, so its usage is often limited to 10 to 30 Weight% about
Therefore, NA gaskets have the characteristics of low fiber content and large filling material ratio compared to asbestos gaskets. Small amount of filling material, so it is easy to become brittle and cannot maintain tensile strength
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

[0025] The base fiber, rubber, rubber chemicals, filler, and toluene formulated as shown in Table 1 were mixed with a Henschel mixer at low 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 pressure vulcanization was performed while laminating on the hot roll side to obtain a 1.5 mm thick NA sheet spacers. In addition, the input amount of each raw material in the slurry was adjusted so that the composition of the finished NA sheet-like gasket became the ratio shown in Table 1. The data in Table 1 are % by weight. In addition, in the representation of rubber, NBR represents nitrile rubber, HNBR represents hydrogenated nitrile rubber, SBR represents styrene butadiene rubber, and EPDM represents ethylene-propylene rubber. The tensile strength of the obtained NA sheet gasket was evaluated under various conditions. The measurement of the tensile strength in the no...

Embodiment 2～5

[0027] Using the materials shown in Examples 2 to 5 in Table 1, NA sheet-like gaskets with a thickness of 1.5 mm were manufactured in the same manner as in Example 1, and the tensile strength was measured in the same manner. The results are shown in Table 2.

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Abstract

A non-asbestos gasket sheet including a composition which includes a base fiber containing an organic fiber as a major fiber component, rubber, a filler, and a rubber chemical, the amount of the organic fiber in the composition is 15 to 30 wt %, and the filler including graphite. The non-asbestos gasket sheet exhibits tensile strength equivalent to or greater than that of an asbestos joint sheet, and can be used under high temperature conditions.

Description

technical field [0001] The present invention relates to non-asbestos sheet gaskets (hereinafter referred to as NA sheet gaskets) 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 of flakes. [0003] In the past, asbestos gaskets, which use asbestos in the base fiber, have been widely used...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K3/10
CPCY10T442/2893C09K3/1028Y10T442/2221Y10T442/2369
Inventor 糸井克丰小高康二郎齐藤浩史
Owner NICHIAS CORP
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