White flexible sealing filler and preparation method thereof

Abstract

The invention relates to a white flexible sealing filler and a preparation method thereof. The white flexible sealing filler is prepared from 42-48wt% of PTFE (polytetrafluoroethylene) fiber, 10-15wt% of Kelvar fiber, 28-32wt% of lubricating agent, 8-12wt% of natural rubber and 2-4wt% of calcium carbonate, wherein the lubricating agent is prepared from high-temperature silicone oil and Vaseline in a mass ratio of 5:1. The preparation method is characterized by grinding the PTFE fiber, Kelvar fiber, natural rubber and calcium carbonate in a grinder, putting the obtained powder mixture into a constant-temperature heating container, stirring the powder mixture with stirring equipment, adding the lubricating agent and continuing stirring after the powder mixture is uniformly mixed by stirring, always keeping the container at a constant temperature of 90-180 DEG C in the stirring process and continuing stirring until a pulpy product is finally formed. The white flexible sealing filler has good electrical insulating property and chemical resistance, strong plasticity, outstanding tensile strength, wear resistance and anti-cracking and anti-corrosion properties and high resilience, and can be used for sealing valves and pumps in the fields such as water treatment, papermaking, medicaments and the like.

Description

technical field [0001] The invention relates to a sealing packing, in particular to a white flexible sealing packing and a preparation method thereof. Background technique [0002] Whether the valve or pump is good or bad, in addition to the material and structure of the valve or pump meeting the requirements of the working medium, the choice of sealing structure and form is also crucial. Reasonable selection of sealing structure and form is the key to ensure normal and orderly production, reduce maintenance and repair costs, reduce engineering labor intensity, reduce material waste, and avoid environmental pollution. [0003] At present, according to different working conditions and media, as well as different requirements of users for sealing performance, sealing solutions can be divided into packing seals, mechanical seals, and flexible packing seals. Among them, the packing seal achieves the sealing effect by winding. This sealing method is cheap and easy to install and...

AI Technical Summary

Problems solved by technology

[0005] The current flexible sealing packings have the following problems: most of the flexible sealing packings contain only one kind of fiber material, and the fiber strength is not enough to affect its tensile strength; the resilience is poor, which affects the compensation of stress relaxation caused by solid volume loss, and the occurrence of The sealing performance is reduced due to the out-of-roundness and deflection of the sealing shaft; there is no anti-cracking effect of the filler, and the appropriateness of the filler cannot be guaranteed, which will cause chapping on the surface of the filler or the phenomenon of filler hardening; The use of time will inevitably lead to rust

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