Method for cleaning polyphenylene sulfide melt spinning spinneret

Abstract

The invention relates to a method for cleaning a polyphenylene sulfide melt spinning spinneret. Regarding that high polymer has the characteristics of high decomposition temperature, organic and inorganic solvent insolubility, based on the actual condition that the polyphenylene sulfide is firmly attached on the spinneret and is hard to clean, according to the principle that structural components of chemical substances are similar and compatible, the method adopts biphenyl-biphenyl ether served as cleaning agent to complete cleaning of the spinneret in a cleaning kettle at 280 DEG C and 0.08MPa under cleaning agent out-kettle circular flowing, and finally completes cleaning of the spinneret through calcining of a calcinator, ultrasonic cleaning and compressed air drying. The cleaning method has short technical process, few used equipment, good cleaning effect and cleaning rate of spinneret attachment reaching 99.999 percent, ensures that the spinneret has no phenomena of deformation, corrosion or decarburization, and is a perfect cleaning method for the polyphenylene sulfide melt spinning spinneret. Components and parts of other spinning machines attached with polyphenylene sulfide high polymer also can be cleaned by using the method.

Description

technical field [0001] The invention relates to a cleaning method for a polyphenylene sulfide melt spinning spinneret, which belongs to the technical field of maintenance, cleaning and recycling of polyphenylene sulfide melt spinning parts. Background technique [0002] Polyphenylene sulfide fiber, referred to as PPS fiber, has excellent high temperature resistance, corrosion resistance, non-toxicity, flame retardancy, insulation, good mechanical properties and dimensional stability, and is widely used in industry. [0003] The raw material for preparing polyphenylene sulfide fiber is mainly derived from polyphenylene sulfide resin. PPS fiber is prepared by melt spinning method, and the fiber is formed by spinning, cooling and stretching at 320°C. [0004] The main component of the fiber forming of the polyphenylene sulfide melt spinning machine is the spinneret. The main function of the spinneret is to spray the high polymer melt from the spinneret into a uniform melt strea...

AI Technical Summary

Problems solved by technology

[0005] During the spinning process, the residues of raw materials and impurities deposited on the spinneret will accumulate day by day, the internal pressure will increase, and even material leakage and plate hole blockage will occur. , pollute the working surface of the spinneret, causing the spinneret hole to have a stripping effect, which greatly affects the spinnability and fiber quality of the spinning, so the spinneret must be cleaned periodically

[0006] There are many ways to clean the spinneret. Commonly used methods include calcination, solvent cleaning, vacuum hydrolysis, ultrasonic cleaning, alkaline bath, etc. These methods are often used alone. Performance limitations, simple high-temperature calcination, easy to change the structure of the spinneret material and deformation of the spinneret hole, and at the same time, polyphenylene sulfide will be oxidized to generate SO at high temperature 2 , resulting in severe chemical corrosion, decarburization, the strength of the spinneret is reduced, and the fatigue limit is reduced, which affects the service life and the spinning quality. Other cleaning methods also have many disadvantages and the effect is poor. , making spinneret cleaning a major problem

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