Chemicals

The chemical and powder coatings sectors represent a high-end application market for twin-screw extrusion technology. The core requirement is not merely high output or wear resistance, but achieving controlled, stable, clean, and efficient mixing, reaction, and devolatilization under complex chemical environments and precise process conditions. This necessitates customized solutions that integrate corrosion-resistant specialty materials, mechanical designs capable of withstanding extreme loads, and fully integrated process modules.

Process Characteristics:  The chemical and powder coatings industries impose multidimensional and stringent requirements on twin-screw extrusion processes. These include handling materials across a wide viscosity range, processing highly corrosive or abrasive materials, achieving precise control over chemical reactions, and meeting strict purity and safety standards. This requires core components with specialized performance exceeding that of standard designs. Typical applications include reactive extrusion, powder coatings, hot-melt adhesives, battery materials such as electrode slurries, and additive synthesis.

Core Component Requirements:

Screw element:

Screw elements play a decisive role in enabling twin-screw extruders to process complex formulations. Their geometry must deliver excellent distributive and dispersive mixing to ensure uniform distribution of all components, including nanoparticles. When processing highly corrosive material such as acids or catalysts, specialty alloys or corrosion-resistant coatings are essential. For low-bulk-density, hard-to-feed materials like powders or fumed silica, optimized screw designs ensure stable conveying. In addition, self-cleaning geometries and easy-to-clean surface finishes support flexible and efficient formulation changeover.

Screw shaft:

The screw shaft withstands the extreme torque and axial loads generated by high-viscosity materials and extended reaction processes, with L/D ratios reaching up to 68. It offers top-level structural rigidity and fatigue strength. In applications involving precise chemical reactions or heat-sensitive materials, high precision machining and excellent dynamic balance of the shaft are critical to maintaining stable process conditions and preventing localized overheating.

Screw barrel:

As an integrated multifunctional reaction platform, the barrel must meet comprehensive performance requirements. Its modular design allows flexible configurations —including multiple feeding points and multi-stage devolatilization—to match specific processes. For aggressive chemical environments, fully corrosion-resistant alloys are used. A multistage high-efficiency vacuum-venting system is integrated to effectively remove solvents, moisture, and reaction by-products. Furthermore, to satisfy explosion-proof and contamination-free demands of sectors such as battery materials, the barrel incorporates a sealed design, explosion-proof certification, and dead-zone-free structures that enable thorough and easy cleaning.