Double-screw extruder for producing powder coating

Abstract

The invention discloses a double-screw extruder for producing a powder coating. The double-screw extruder comprises a screw drum, two screws and a power mechanism, wherein each screw rod comprises a transmission part and a transmission shaft; the power mechanism comprises a driving shaft in which a water tank is arranged; the water tank comprises a water inlet end and a water outlet end; a connecting assembly is arranged between one side of the driving shaft, which is located at the water outlet end, and the transmission shaft; a cooling tank is arranged inside each screw rod; the cooling tanks are communicated with the water tank; the water tank is internally provided with a water inlet pipe; a gap is formed among the water inlet pipe, the cooling tanks and the water tank; the water inlet pipe is externally connected with a water supply source; the other side of the driving shaft, which is located at the water inlet end, is provided with a water outlet; and the water outlet is communicated with a gap formed between the driving shaft and the water inlet pipe. By using the double-screw extruder for producing the powder coating, disclosed by the invention, materials can be smoothly extruded from the screws, raw materials can be prevented from being accumulated and cured at dead angles of the two screws, and the two screws can be used for conveying raw materials at high efficiency for a long term.

Description

technical field [0001] The present invention relates to a twin-screw extruder, more particularly, it relates to a twin-screw extruder for producing powder coatings. Background technique [0002] The raw materials required for powder production include resins, curing agents, additives, and pigments. The processing temperature of materials such as resins, curing agents, and additives in the production process should be 5°C higher than the softening point to melt the materials to achieve the effect of mixing and shearing. In the prior art, powder coatings usually use a twin-screw extruder to melt and extrude the powder during the production process. Due to the need to heat the screw barrel to the softening temperature of the raw material, and the interaction between the two internal screws A lot of heat is generated, so the temperature on the screw will be much higher than the softening temperature. When the temperature reaches a certain level, it will reach the glass transitio...

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Problems solved by technology

[0002] The raw materials required for powder production include resins, curing agents, additives, and pigments. The processing temperature of materials such as resins, curing agents, and additives in the production process should be 5°C higher than the softening point to melt the materials to achieve the effect of mixing and shearing. In the prior art, powder coatings usually use a twin-screw extruder to melt and extrude the powder during the production process. Due to the need to heat the screw barrel to the softening temperature of the raw material, and the interaction between the two internal screws A lot of heat is generated, so the temperature on the screw will be much higher than the softening temperature. When the temperature reaches a certain level, it will reach the glass transition temperature of the resin. When the temperature is higher than the glass transition temperature of the resin, the resin will appear. Its viscous characteristics, at this time, the raw material will be attached to the screw, so that the screw cannot drive the raw material out of the extruder, so that the material stays in the screw barrel for a long time to gel or solidify, so that the dead angle of the two screws will become There is solidification and accumulation of raw materials, which reduces the efficiency of the two screws for raw material transportation

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