Extreme rheological behavior composite material multi-layer co-extrusion continuous forming method and equipment

Abstract

The invention discloses an extreme rheological behavior composite material multi-layer co-extrusion continuous forming method and equipment. The extreme rheological behavior composite material multi-layer co-extrusion continuous forming method comprises the following steps: performing dispersion and mixing on a material with an extreme rheological behavior separately by using a flow field generated by the reciprocating circulation of a stretching chaotic unit; and then performing multi-layer co-extrusion continuous forming on the various materials which are dispersed and mixed separately. Theextreme rheological behavior composite material multi-layer co-extrusion continuous forming equipment comprises a co-extrusion device and a plurality of mixing devices; the material outlet end of eachmixing device is connected to the co-extrusion device; each mixing device comprises a first charging barrel, a second charging barrel, a first plunger, a second plunger, a bidirectional power mechanism and a stretching chaotic unit; the bottom of the first charging barrel is communicated with the bottom of the second charging barrel through the stretching chaotic unit; the first plunger is movably arranged on the first charging barrel; the second plunger is movably arranged on the second charging barrel; the first plunger and the second plunger are connected to the bidirectional power mechanism separately; and the first plunger and the second plunger perform ascending and descending motions alternately. The invention effectively solves the problem that the composite material with the extreme rheological behavior is difficult to process.

Description

technical field [0001] The invention relates to the technical field of polymer material molding, in particular to a multi-layer co-extrusion continuous molding method and equipment for composite materials with extreme rheological behavior based on tensile chaotic flow field. Background technique [0002] Materials with extreme rheological behavior include ultra-high molecular weight polyethylene, composite materials with high solid content, and solutions with ultra-low concentrations. Among them, due to the characteristics of high melt viscosity, small friction coefficient, low critical shear rate and narrow molding temperature range, ultra-high molecular weight polyethylene is difficult to extrude and process with traditional screw extruders. High molecular weight polyethylene products often adopt the plunger extrusion molding method. However, due to the extremely poor fluidity of composite materials with high solid content, it is very difficult to extrude by melting metho...

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Problems solved by technology

[0003] Under this premise, if the multi-layer composite product to be formed is a composite film with a large difference in viscosity, such as a solid polymer electrolyte / positive electrode composite film, the solid polymer electrolyte is a composite material with a conventional viscosity, which can be extruded by traditional extrusion methods. However, the positive electrode is a composite material with high solid content, which is difficult to be extruded by traditional extrusion molding methods, and the commonly used plunger extrusion molding method does not have the function of material mixing, so it is also difficult to apply; if solution casting / coating is used The cloth forming method cannot form a composite film in one step, and its production cost is very high

[0004] It can be seen from the above that in the existing production methods, the outstanding technical problems are mainly: the plunger extrusion molding method can convey but cannot disperse and mix, and the solution casting / coating molding method can disperse and mix but is difficult to convey, and the two Both molding methods are intermittent / semi-continuous molding methods

The existing multi-layer composite products (such as multi-layer composite film, multi-layer composite pipe, etc.) are widely used in various fields of national economy and people's livelihood. The selection of materials for each layer has become more extensive and diverse, but it is still difficult to prepare multi-layer composite products at one time through composite materials with large viscosity differences, and there is a huge room for challenges

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