A cyclic stretching and mixing method and equipment for polymer nanocomposite materials

Abstract

The invention relates to a circular tensioning and mixing method and device for a polymer nanocomposite. According to the method, a controllable tensioning force field is generated by adjusting the eccentric distance between a machine barrel and a rotor; along with the rotation of the rotor, blades on the rotor are tightly attached to the inner wall of the machine barrel all the time under the action of a spring; and forced fusing plastification and dispersing mixing are carried out on the polymer nanocomposite. The device comprises a bottom plate, the rotor, the machine barrel, the spring, the blades, high-temperature-resistant visual glass, a heating ring, a heating plate, a motor and a control system, wherein the machine barrel can linearly move on the bottom plate to adjust the eccentric distance between the machine barrel and the rotor; the stretching distance of the blades can be adjusted through the spring, and it is ensured that the outer edges of the blades are tightly attached to the inner wall of the machine barrel all the time in the rotation process of the rotor; and a rotor shaft is connected with the motor through a transmission mechanism. The circular tensioning and mixing method and device for the polymer nanocomposite are characterized in that the movable machine barrel is adopted to be in eccentric fit with the rotor to generate the tensioning force field, the rotor is used for driving the blades to generate a forced pushing function, and the circular mixing process of the polymer nanocomposite in the tensioning force field is realized in structure. The circular tensioning and mixing method and device for the polymer nanocomposite have the advantages that (1) the intensity of the tensioning force field can be adjusted by changing the eccentric distance between the machine barrel and the rotor; (2) through forced pushing of the stretchable blades, the fused polymer nanocomposite is subjected to circular mixing in the tensioning force field, and generation of turbulence of melt is avoided; (3) aggregates in the polymer nanocomposite can be effectively crushed, and particles in the polymer nanocomposite can be effectively dispersed; and (4) the mixing condition of the polymer nanocomposite can be observed directly through the high-temperature-resistant visual glass.

Description

technical field [0001] The invention relates to the field of polymer nanocomposite processing, in particular to a cyclic stretching and mixing method and equipment for polymer nanocomposite materials. Background technique [0002] With the development of science and technology and the requirements of modernization, the application of polymer composite materials is becoming more and more extensive, but the existing polymer composite materials are increasingly unable to meet people's growing demand for product function diversification, refinement, and compounding. demand. The quality of polymer composites depends on the dispersion and mixing effect between inorganic particles, organic particles and polymer matrix after mixing processing. Generally, polymer-based materials are mainly affected by various force fields such as shearing and stretching during mixing. However, conventional processing and mixing equipment cannot carefully study the influence of the characteristics of...

AI Technical Summary

Problems solved by technology

However, due to the high chemical activity, van der Waals force and hydrogen bond force of nanoparticles, it is easy to form agglomerates, which increases the difficulty of dispersion and mixing of nanoparticles in the mixing process; at the same time, polymer nanocomposites are mostly used Conventional screw extruders and injection molding machines are used for mixing and processing. The above-mentioned equipment has the following defects when processing polymer nanocomposites: (1) The screw processing equipment mainly relies on the shear force field for processing. Nanoparticles are dispersed, and the shear force field is too small to easily lead to poor dispersion of nanoparticles, and the shear force field is too large to easily destroy the shape of nanoparticles with a large aspect ratio, and the dispersion efficiency of the shear force field to nanoparticles is low , the dispersion effect is not good; (2) when the nanoparticles are mixed with the polymer, due to the multiple collisions in the shear force field, it is easy to produce secondary and multiple agglomerations, and the dispersion uniformity of the particles is also difficult to guarantee; ( 3) Compared with the tensile force field, the effect of the shear force field on breaking particle agglomerates and improving particle dispersion is quite different.

Images