Fiber reinforced graphite rubber plate and its preparation method

Abstract

This invention relates to a fiber reinforced graphite rubber plate utilized at pipeline flange and its preparation. It mainly solves the flaws of present techniques using rubber as luting agent and existing low temperature property. It can not completely substitute asbestos gaskets use condition, so it limits the serviceable range of this material; And it also solves the technique problems, such as: graphite content is low, particle is fairly coarse, working condition is narrow, especially the bearing temperature range is fairly small and so on. This invention composition; and quality percentage are: rubber 10-20%, flexibility graphite 55-75%, strengthened fiber 3-10%, stuffing 5-25%, the rest is sulfurizing accessory ingredient. Its preparation: progress heat treatment for graphite piece, after cooling and compact progress shattering, orderly add flexibility graphite powder, operation agent, sulfurizing accessory ingredient, strengthened fiber, sol rubber to mix; use forming piece equipment, utilize relative rotation of roller tube to carry out forming piece and producing piece; utilize flat plate sulfurizing machine to sulfurize half-finished product, yield the invented product.

Description

technical field

[0001] The invention relates to a sealing device and a manufacturing method, in particular to a fiber-reinforced graphite rubber plate used on a pipeline flange and a preparation method thereof. Background technique

[0002] Compared with foreign products, there is a big gap between the sealing gaskets used for pipeline flanges in my country. Traditional gasket materials represented by asbestos rubber gaskets are still widely used. Harmful, whose use is prohibited or restricted by law or fact. With the development of my country's economy and the improvement of people's living standards, it is the general trend to restrict and eventually ban asbestos materials. At present, the replacement of asbestos gaskets mainly includes the following categories: flexible graphite gaskets, PTFE gaskets, compressed non-asbestos fiber gaskets and various rubber gaskets, but the above-mentioned materials for replacing asbestos have their own defects. For example, flexible gra...