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There are many types of sealing products and different working conditions, such as heat resistance, oil resistance, chemical resistance, and working conditions (static, dynamic, rotating and swinging, etc.), speed, and working pressure. Therefore, the rubber seals used for mechanical seals must first consider the conditions of use or special conditions on the rubber, and then comprehensively consider the reasonable formula and processing technology in the vulcanization promotion system, reinforced filling system, softening system, and protection system. Generally used for mechanical sealing, the rubber must have good elasticity and low compression set to meet the special performance requirements of different product conditions. As a dynamic seal, it is also required that the rubber material has a certain tensile strength, good abrasion resistance and tear resistance.
是一种外形结构简单、规格繁多、需用数量极大的一种密封制品。 O-ring is a kind of sealing products with simple outline structure, many specifications, and a large number of required products. O-ring seal quality life depends on dimensional accuracy and rubber. Generally, the rubber is required to have certain mechanical strength, tear resistance, good heat resistance, oil resistance, chemical resistance, and small compression set under the use conditions, which are its main indicators.
According to the requirements of use, generally there are requirements for heat resistance and oil resistance, and nitrile rubber is the most used rubber. Acrylic rubber can be used for oil-resistant seal products requiring higher temperature (such as 150 ~ C-90 ° C). Fluorine rubber for oil-resistant rubber products and silicone rubber for heat resistance are required. When the working pressure is high, the method to increase the hardness of the O-ring rubber is to increase the filling amount of carbon black, but the filling amount is too high, the mixing is difficult, and the basic physical properties of the vulcanized rubber are damaged, and the rubber is prone to scorch.
In the case of using the same kind of rubber, such as nitrile rubber, in order to improve heat and oil resistance and reduce compression set, a peroxide (such as DCP) vulcanization system or an effective sulfur vulcanization system (low sulfur and high acceleration) can be used. . These two vulcanization systems can generate more carbon-carbon bond cross-linked structure and single sulfur bond cross-linked structure, which can effectively improve the heat resistance and oil resistance of vulcanizates and reduce compression set.
的耐热、耐油胶料配方的填充补强体系中，多采用活性较低的的热裂炭黑、喷雾炭黑或半补强炭黑，这些炭黑的特点是粒子较粗，胶料弹性好、生热低、压缩永久变形低，并可大量填充，降低胶料成本。 In the filling and reinforcing system of the heat-resistant and oil-resistant compound formula of O-ring seals , thermal cracking carbon black, spray carbon black or semi-reinforcing carbon black with low activity are mostly used. These carbon blacks are characterized by coarse particles. , Rubber has good elasticity, low heat generation, low compression set, and can be filled in large quantities to reduce rubber cost. If the O-ring is used under dynamic sealing conditions, the tear resistance needs to be increased, and a part of the highly active high wear-resistant carbon black can be used together. Fluoro rubber compounds are self-reinforcing rubbers. If activated carbon black is added, the mechanical properties of the rubber are reduced, so thermal cracked carbon black or spray carbon black is generally filled with a small amount of coarse particles with low activity.
Cixi Haisheng Rubber Products Co., Ltd. is an O-ring seal manufacturer integrating development, manufacturing and sales. The main products are O-rings, seals, rubber gaskets, and rubber products. 。 Can provide customers with standard and non-standard rubber seal products for various industries .
[Label this article]: O-rings | sealing rings | rubber ring manufacturers
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