The technological innovation of the extruder(2)

1. (extruder parts)Using the rheological modeling method and combined with the micro rheological model controlling the morphological evolution of polymer materials, the flow field in polymer extrusion and the morphological evolution of blends and nanocomposites were modeled, simulated and analyzed, especially for the melting in extruder The theoretical research on mixing and melt flow reveals the mechanism of how to improve melting and mixing performance and reduce energy consumption.

2.(extruder parts)Based on the above theoretical research, the developed chaotic mixing low energy consumption extruder is obviously different from the extruder commonly used at home and abroad in principle: the latter takes place in the classical Maddock melting process and shear mixing, and its melting and mixing effect is poor; The former produces dispersed melting and chaotic mixing, and the shear heat generated by the material is less than the heat energy required for melting, which can prevent the material from overheating and wasting energy in the process of melting and mixing, and the energy-saving effect is obvious. According to the on-site inspection of Guangdong Technical Supervision and mechanical product quality supervision and inspection station, The nominal specific power (i.e. unit consumption) of the extruder is 0.17 kW / kg / h, which is 0.15 kW / kg / h lower than the specified value [0.32 kW / kg / h] in the national machinery industry standard JB / T 8061-96. It is similar to two foreign companies representing the highest level of extrusion compounding in the world The comparison of extruders (Davis standard company of the United States and Sumitomo heavy machinery modern company of Japan) shows that the extruder developed in this achievement has the highest extrusion output and the lowest motor power. The extruder also has the advantages of low extrusion melt temperature (10 ~ 20 ℃) and strong material adaptability.

3. (extruder parts)Based on the above macro flow field simulation and micro morphology evolution theory, combined with the developed chaotic mixing low energy consumption extruder, For polymer blends (especially the viscosity ratio is much greater than 1) and nanocomposites The morphological evolution, dispersion state and macro properties of (especially with non-polar materials such as polyolefins as matrix) are systematically studied. It is confirmed that chaotic mixing extruder can improve processing performance and reduce processing energy consumption, especially its tensile and folding effect is conducive to the formation of high dispersion, sheet, intercalation or peeling, and solves the problem of nano-sized extrusion to a certain extent The difficult problem that particles are easy to agglomerate in the processing of polymer materials greatly improves the barrier and mechanical properties of packaging products.

4. (extruder parts)Compared with the conventional method of dissolving EVA on the substrate with toxic solvent, the emission of toxic organic solvent and its pollution to the environment and human body are eliminated; In addition, the adhesion between the extruded film and the composite substrate is greatly improved, and the "green composite process without adhesive accelerator" is realized.