Method and equipment for atomizing, cooling and granulating nylon polymer

Abstract

The invention relates to a method for spraying, cooling and granulating a nylon polymer. The method comprises the following steps of: conveying a nylon polymer melt in a reaction kettle to a pressure sprayer on the top of a spraying tower by a heat-insulating pipeline under the pressure action, spraying the nylon polymer melt from the pressure sprayer, dispersing into fine fog drips, flashing moisture in the fog drips at high temperature, and drying quickly; cooling the high-temperature fog drips by cooling gas which enters the spraying tower to form uniform nylon solid granules, and settling the nylon solid granules in the tower; opening a gas outlet of the spraying tower, starting a draught fan, leading mixed gas in the spraying tower out of the gas outlet, and maintaining pressure of -100 to 20 Pa in the spraying tower; and collecting the nylon solid granules which drop to the bottom of the spraying tower, grading, and packaging to form a finished product. The invention also provides equipment for spraying, cooling and granulating the nylon polymer. By the method and the equipment, the discharge speed is improved, the granularity is increased, and discharged materials can be protected by nitrogen to prevent the materials from being oxidized; and the device is high in controllability and regulation performance.

Description

technical field [0001] The invention relates to the technical field of polymer granulation, in particular to a nylon polymer spray cooling granulation method and equipment for realizing the method. Background technique [0002] At present, in industrial production, the granulation method of nylon polymer is water-cooled granulation, that is, after the reaction in the reactor is completed, the steam pressure is released to 0.1~0.2MPa, the moisture in the reactor is released, and then the discharge valve is opened. , the discharge valve is connected to the extruder, and the material enters the extruder under pressure and is squeezed into a linear shape by the extruder and falls into the water tank to cool and solidify. Finally, the solidified linear nylon is pulled by the pelletizer for continuous pelletizing. [0003] The disadvantage of this method is that due to the high temperature of the nylon polymer, the traditional water-cooled pelletizing method has high requirements ...

AI Technical Summary

Problems solved by technology

[0003] The disadvantage of this method is that due to the high temperature of the nylon polymer, the traditional water-cooled pelletizing method has high requirements on the output viscosity of the material. If the viscosity of the material is too low, it cannot be continuously solidified into filaments, resulting in interruption of continuous pelletizing. Pelleting cannot be carried out, and the water in the material is not fully released, which will cause serious air bubbles in the silk, resulting in material waste; if the pressure relief time is too long, the material viscosity is too high, when the pressure in the reactor is not enough to press the material out , will cause the material to solidify in the kettle, resulting in material scrapping, production stagnation, and troublesome cleaning, heavy workload, resulting in waste of materials and labor

[0004] At present, no new discharge granulation process has been developed in industrial production, which is also an urgent problem to be solved in the field

Images