Process for making high-pressure sheet gasketing materials

Abstract

A method for making high-pressure sheet gasketing material is provided that employs an elastomer, such as natural rubber and / or acylonitrile-butadiene rubber. Tert-butyl acetate is added to dissolve the elastomer. Other components may then be mixed with the dissolved elastomer and may include, for example, antioxidants, colorants, curing agents, curing accelerators, reinforcing fillers, and fibers such as organic and / or mineral fibers. The resulting dough may be formed into a high-pressure sheets, for use as gasketing material, using a two-roll sheeter machine, or the like.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to U.S. Provisional Patent Application No. 60 / 873,336, entitled "AN IMPROVED PROCES S FOR MAKING HIGHPRES SURE SHEET GASKETING MATERIALS," filed December 7, 2006, which provides The patent application is hereby incorporated by reference in its entirety. Background technique [0003] High-pressure sheets used as sealing materials are traditionally prepared by mixing a fibrous substrate with a rubber binder and subjecting the resulting mixture to pressure and high temperature. Typically, such sheets are prepared on a two-roll tablet press, such as a Troester machine, having a pair of rollers arranged one above the other. The lower roll is usually a larger heated roll and the upper roll is usually a smaller unheated roll. In order to prepare conventional boards on such machines, it is first necessary to accumulate a certain amount of starting compound on heated rolls. Then, a certain amou...

AI Technical Summary

Problems solved by technology

Therefore, even a small amount of accumulation on the chill roll will result in a rough surface of the sheet, which not only affects the aesthetics visually, but also has an adverse effect on the properties of the material (such as the sealing performance of the sealing material)

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