Preparation method of ultra-large mud pump shaft L-shaped sealing element rubber

Abstract

The invention relates to a preparation method of ultra-large mud pump shaft L-shaped sealing element rubber, which comprises the following steps: (1) banburying: discharging plastifying rubber by a Banbury mixer; (2) compounding: after discharging the formed compounding material, discharging a sheet at an open mill, and storing in a cool plate for more than 4 hours for later use; (3) vulcanizing and grinding 3-5 times, discharging, and storing, thereby finishing preparing the rubber for later use; and (4) before putting into production and use, controlling the processing temperature of the open mill at 60-80 DEG C, adding 1.5-3 parts of dibenzoyl peroxide, uniformly mixing, and grinding 3 times, thereby forming the finished product for later use. Due to the addition of the peroxide and crosslinking assistant, the molecules in the unvulcanized part in the rubber vulcanizing process are vulcanized into a C=C double bond chain by the peroxide and crosslinking assistant, so that the rubber is almost completely vulcanized and forms a more stable molecular structure; and the effect is very obvious, so that the rubber has the effects of high wear resistance, high strength, high pressure resistance, shock resistance and deformation resistance.

Description

technical field [0001] The invention belongs to the field of sealing, and relates to a seal member of a pump shaft of a mud pump, in particular to a method for preparing a rubber compound for an L-shaped seal of a pump shaft of a super-large mud pump. Background technique [0002] The seal used for the dredger mud pump shaft is an L-shaped seal. Because the contact medium of the dredger is mud, sand and water slurry, the use environment is harsh, and the damage is manifested in severe wear, tearing of the lip, and fracture of the waist. The lifespan is generally about 7 days, and it has been dependent on imports for a long time. Imported products (produced by IHC in Germany) generally have a lifespan of about 10 days, and there is no product standard. [0003] Through the search, the following two related published patent documents were found: [0004] 1. A high-hardness rubber seal material (CN102993478A), whose rubber raw material components and weight ratio are selected ...

AI Technical Summary

Problems solved by technology

[0002] The seal used for the dredger mud pump shaft is an L-shaped seal. Because the contact medium of the dredger is mud, sand and water slurry, the use environment is harsh, and the damage is manifested in severe wear, tearing of the lip, and fracture of the waist. The lifespan is generally about 7 days, and it has been dependent on imports for a long time. Imported products (produced by IHC in Germany) generally have a lifespan of about 10 days, and there is no product standard