Views: 9 Author: Site Editor Publish Time: 2023-07-24 Origin: Site
The meshing type co-rotating parallel twin screw extruder has the advantages of high conveying efficiency, strong dispersion and mixing ability, good self-cleaning performance, uniform distribution of material residence time in the machine and good adaptability, and is widely used in blending modification between different plastics and between plastics and rubber.
Powder coating is a solid powdered synthetic resin coating composed of solid resin, pigments, fillers and additives. Unlike ordinary solventborne coatings and waterborne coatings, the dispersion medium of powder coatings is not solvent and water, but air, and its advantages are no solvent pollution, 100% film formation, low energy consumption and easy storage and transportation.
Powder coatings have two categories: thermosetting and thermoplastic. The market is mainly thermosetting powder coatings, which can be widely used in automobiles, home appliances, hardware, building materials, oil pipelines, aerospace industry and weapons industry and other industries.
The preparation process of powder coatings is relatively complex. First, the special resin, pigment filler, curing agent and other additives are premixed with a mixer in a certain proportion, and then melted and dispersed evenly by the parallel co-rotating twin screw extruder, and then extruded, tableted, crushed and screened. Among them, the key to determining the performance of powder coating lies in the dispersion and distribution effect of parallel co-rotating twin screw extruder.
In this process, the inorganic filler in the powder coating system is dispersed by the shear force when subjected to the mutually meshing twin screw shear section; Moreover, because the twin screw has a super surface renewal ability, the inorganic pigment that has been dispersed can be evenly distributed in the base resin, which better ensures the excellent film formation, dispersion and leveling of the powder coating.
As a well-known R&D and manufacturer of parallel co-screw extrusion in China, Nanjing Haisi has accumulated 20 years of industry experience in the plastics processing industry, and has formed the development and application of multi-specification extruders from screw diameter TSE-20 to TSE-135. The equipment and downstream supporting facilities are mature, the processing section configuration technology is mature, the yield energy consumption is low, the product quality is stable, and the performance of the whole machine has reached the world's advanced level!
