KEYA Twin Screw Extruder Technology Made a Major Breakthrough and Achieved Innovative Application in Powder Coating Processing Industry!

Co-rotating twin-screw extruder, i.e. meshing co-rotating parallel twin-screw extruder, has the advantages of high conveying efficiency, strong dispersion and mixing ability, good self-cleaning performance, uniform residence time distribution of materials in the machine and good adaptability. It is widely used for blending modification between different plastics and between plastics and rubber.

1. Technical innovation and application of twin screw extruder in powder coating processing industry

As a famous manufacturer of parallel co-rotating twin-screw extruder, Nanjing KEYA has developed twin-screw equipment with strong technical force and high-end processing equipment, which has completed more than 500 kinds of material process applications!

Continuous market development in the application field is the development direction and core competitiveness of KEYA. At present, with the development and exploration of enterprise technicians, KEYA parallel co-rotating twin-screw extruder has realized the technical innovation and application in powder coating processing industry!

Powder coating is a solid powder synthetic resin coating composed of solid resin, pigment, filler and additives. Different from ordinary solvent-based coatings and waterborne coatings, the dispersion medium of powder coatings is not solvent and water, but air. Its advantages are no solvent pollution, 100% film formation, low energy consumption and easy storage and transportation.

China powder coating lab scale twin screw extruder

Powder coatings are thermosetting and thermoplastic. The market is mainly thermosetting powder coatings, which can be widely used in automobile, household appliances, hardware, building materials, oil pipeline, aerospace industry, weapon industry and other industries.

2. Development of twin screw extruder in powder coating processing industry

China is the world's largest producer and consumer of powder coatings. According to statistics, in 2020, the total production and sales volume of powder coatings in China was about 2.3 million tons, of which the sales volume of thermosetting powder coatings was about 2.12 million tons, an increase of 10.4% over the previous year, and the total sales volume maintained a rapid growth. China's powder coating production areas are mainly concentrated in the Yangtze River Delta, Pearl River Delta and Bohai rim. Among them, the output of powder coatings in the Yangtze River delta accounts for the highest proportion, which has been about 45% in recent five years. The production enterprises in the Yangtze River Delta mainly include Akzo Nobel, Huacai, Wenzhou Nippon, Jade, Changming and other enterprises in Zhejiang Province; Huajia, Meijia, Sunroad and other enterprises in Anhui Province and Huaguang, Tiger and other enterprises in Jiangsu Province.

The preparation process of powder coating is relatively complex. Firstly, the special resin, pigments and fillers, curing agent and other additives are premixed with a mixer according to a certain proportion, and then melted and dispersed evenly through a parallel co-rotating twin-screw extruder, and then extruded, pressed, crushed and screened. The key to the performance of powder coating is the dispersion and distribution effect of parallel co-rotating twin screw extruder.

In this process, when the inorganic pigments and fillers in the powder coating system are subjected to the mutually meshing twin-screw shear section, the agglomerated particles are dispersed by the shear force; Moreover, because the twin-screw has super surface renewal ability, the dispersed inorganic pigments and fillers can be evenly distributed in the basic resin, so as to form a uniform island body, which better ensures the excellent film-forming, dispersion and leveling of powder coating.

powder coating twin screw extruder

As the earliest R&D and manufacturer of parallel co-rotating twin-screw extruder in China, Nanjing KEYA has accumulated more than 20 years of industry experience in powder coating processing industry, and has formed the development and application of extruders with multiple specifications and models from screw diameter of 26mm to 177mm. The upstream and downstream supporting facilities of the equipment are mature, the configuration technology of the processing section is mature, the energy consumption per unit production is low, the product quality is stable, the performance of the whole machine has reached the domestic and even world advanced level, and has begun to replace the imported equipment in the powder coating industry!