FEP color particle production process

Abstract

The present invention relates to a FEP color particle production process, wherein a FEP particle material is adopted as a main feeding material, is poured into a material feeding machine, and then is fed to a twin-screw extruder from the material feeding machine, the twin-screw extruder takes color powder from the side direction, the FEP particle material and the color powder are mixed, are extruded from the material outlet of the twin-screw extruder, and are directly introduced into a single-screw extruder, the obtained material passes through a filtration screen and is subjected to strip drawing on a die after a pressure is built, and then water cooling, air drying and pelletizing are performed to prepare the finished product. According to the present invention, the FEP color particle production process has characteristics of high color system stability, short color powder residence time in the screw, no color powder decomposition or yellowing, good product appearance, and 4-5 time increased production capacity.

Description

technical field [0001] The invention relates to a production process of colored particles, in particular to a production process of FEP colored particles. Background technique [0002] FEP (tetrafluoroethylene / hexafluoropropylene copolymer) is a widely used fluoroplastic, which has excellent heat resistance, chemical resistance, extrusion formability, etc., and it also has excellent electrical insulation and Low dielectric loss tangent at high frequencies, low flammability and smoke. Therefore, FEP can be used to make the lining of pipes and chemical equipment, the surface layer of drums, and the insulation material of cables and wires. [0003] At present, the production process of FEP pre-coloring and masterbatch is mainly that FEP powder and toner are pre-mixed by a high-speed mixer, and then extruded by a twin-screw extruder. Although the equipment process of this manufacturing method is relatively simple, the raw materials are easily polluted by human beings in the mi...

AI Technical Summary

Problems solved by technology

Although the equipment process of this manufacturing method is relatively simple, the raw materials are easily polluted by human beings in the mixing process, and at the same time, the inherent capacity of the equipment is reduced, causing a large waste of public resources.

The processing temperature of FEP is 420-450°C, which requires very high heat resistance of the toner. If the toner stays in the extruder for a long time, it will easily cause the decomposition of the toner or the discoloration of the toner. High temperature, followed by the resistance of the filter, makes it difficult to control the parameters, which directly affects the stability of the color system

In addition, due to the limited number of small molecules discharged by the vacuum exhaust of FEP during the production process, the particles are easy to form pores, which leads to the formation of die casting phenomenon during use and affects the appearance of the product.

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