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Multi-layer co-extrusion continuous molding method and equipment for composite materials with extreme rheological behavior

A multi-layer co-extrusion and composite material technology, which is applied in the field of polymer material molding, can solve the problems that the multi-layer composite products with different viscosity are difficult to realize, the composite film cannot be formed in one step, and the material mixing function is not available, so as to achieve good positive displacement transportation Function, good dispersing and mixing effect, good effect of dispersing and mixing

Active Publication Date: 2022-01-18
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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  • Multi-layer co-extrusion continuous molding method and equipment for composite materials with extreme rheological behavior
  • Multi-layer co-extrusion continuous molding method and equipment for composite materials with extreme rheological behavior
  • Multi-layer co-extrusion continuous molding method and equipment for composite materials with extreme rheological behavior

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Experimental program
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Effect test

Embodiment 1

[0038] This embodiment is a multi-layer co-extrusion continuous molding method and equipment for composite materials with extreme rheological behavior, which are used for molding multi-layer sheets composed of different materials.

[0039] The multi-layer co-extrusion continuous molding method of composite materials with extreme rheological behavior is to use the flow field generated by the reciprocating cycle of the stretching chaotic unit to disperse and mix the materials with extreme rheological behavior; Carry out multi-layer co-extrusion continuous molding. Among them, materials with extreme rheological behavior are ultra-viscous materials (such as ultra-high molecular weight polymers such as ultra-high molecular weight polyethylene), medium-viscosity materials (such as polymers such as PE, PP) or ultra-thin materials (such as graphite and crude oil) mixed solutions, etc.).

[0040]In the stretching chaotic unit, the materials located at both ends of the stretching chaot...

Embodiment 2

[0048] This embodiment is a multi-layer co-extrusion continuous molding method and equipment for composite materials with extreme rheological behavior, which are used for forming multi-layer pipes composed of different materials. Compared with Example 1, its difference is: as image 3 As shown, the structure of the multi-layer co-extrusion die in the co-extrusion device is different from that of Example 1, and the final product obtained by this device is a multi-layer pipe.

Embodiment 3

[0050] This embodiment is a multi-layer co-extrusion continuous molding method and equipment for composite materials with extreme rheological behavior, which are used for molding multi-layer sheets composed of different materials. Compared with Example 1, its difference is: as Figure 7 to Figure 9 As shown, the stretching chaotic unit includes multiple stretching and converging outer cylinders connected in sequence, each stretching and converging outer cylinder 9 is provided with a shunt pin 10, and a shunt pin is distributed in the same section of the stretching and converging outer cylinder, An included angle of 30°, 45°, 60° or 90° is formed between the shunt pins in any two adjacent sections, and the specific angle value of the included angle can be selected according to the actual situation of the equipment. The multi-section tensile convergence outer cylinder is connected to form a continuous inner cavity, and the cross section of the inner cavity shows a periodic chang...

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Abstract

The invention discloses a multi-layer co-extrusion continuous molding method and equipment for composite materials with extreme rheological behavior. The flow field generated by the reciprocating cycle of the stretching chaotic unit is used to disperse and mix the materials with extreme rheological behavior respectively; Multi-layer co-extrusion continuous molding of various materials dispersed and mixed. Its equipment includes a co-extrusion device and a plurality of mixing devices, and the material outlet ports of each mixing device are respectively connected with the co-extrusion device; each mixing device includes a first barrel, a second barrel, a first plunger, a second plunger, The two-way power mechanism and the stretching chaotic unit, the bottom of the first barrel and the bottom of the second barrel are connected through the stretching chaotic unit, the first plunger is movable on the first barrel, and the second plunger is movable. On the second material cylinder, the first plunger and the second plunger are respectively connected with the bidirectional power mechanism, and the first plunger and the second plunger move up and down alternately. The invention effectively overcomes the problem of difficult processing of composite materials with extreme rheological behavior.

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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C70/52
CPCB29C70/523B29C70/526
Inventor 张桂珍严明保宋建殷小春
Owner SOUTH CHINA UNIV OF TECH