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A special precision extrusion system for polyvinylidene fluoride

A polyvinylidene fluoride, precise technology, applied in the field of plastic molding and processing, can solve the problems of affecting the quality of extruded products, large pressure fluctuations at the extrusion outlet, poor plasticizing effect, etc., to achieve good plasticization, small pressure fluctuations, extrusion a stable effect

Inactive Publication Date: 2016-01-13
郑泓 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the problems of poor plasticizing effect and large fluctuation of extrusion outlet pressure, which seriously affect the quality of extruded products, when extrusion equipment extrudes PVDF in the current market, and provides a special precision extruder for polyvinylidene fluoride. Extrusion system, good plasticizing effect, small fluctuation of extrusion outlet pressure, can realize precise extrusion of PVDF

Method used

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  • A special precision extrusion system for polyvinylidene fluoride

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Such as figure 1 A special precision extrusion system for polyvinylidene fluoride is shown, including a motor 1, a gear box 2, a feeding hopper 3, a screw 4, a barrel 5, and a heating ring 6 installed on the barrel 5, and the heating ring is divided into 3 parts. - 7 independent heating zones, this embodiment adopts 4 independent heating zones, the heating temperature range of the barrel is 20-400°C; the motor 1 drives the screw 4 to rotate after the gear box 2 changes speed, and the screw 4 is installed with the barrel 5 Inside, and connected with the output shaft of the gearbox 2, the material of the screw is 38CrMoAlA alloy steel, the surface of the screw 4 is provided with a nitrided layer (processed by the existing technology), the thickness of the nitrided layer is 0.3mm, the long diameter of the screw The ratio is 36, and the screw compression ratio is 1.8. The feeding hopper 3 is installed on the barrel 5 at the root of the screw 41 and is connected to the feed...

Embodiment 2

[0025] The difference between this embodiment and Embodiment 1 is: the material of the screw rod 4 is Hastelloy alloy, the surface of the screw rod 4 has no nitrided layer, the length-to-diameter ratio of the screw rod is 28, and the compression ratio of the screw rod is 2.2; the mesh size of the filter screen 7 is At 350 mesh; the displacement of the first melt pump 8 is 30% larger than that of the second melt pump 9.

[0026] Other structures of this embodiment are the same as those of Embodiment 1.

[0027] Specific application implementation: The melt index of the PVDF raw material used is 6.8g / 10min (230°C, 5Kg); the feeding hopper is heated to 60°C, and the PVDF passes through the screw, filter screen, two-stage melt pump (the first melt pump and The second melt pump) after extrusion, the experiment shows that: PVDF plasticizing effect is good, the surface of the extrudate is smooth and shiny, and the pressure fluctuation range of the extrusion outlet is ±0.02MPa.

Embodiment 3

[0029] The difference between this embodiment and Embodiment 1 is that the thickness of the nitrided layer is 0.5mm, the length-to-diameter ratio of the screw is 32, and the compression ratio of the screw is 2.0; the mesh size of the filter screen 7 is 300 mesh; the first melt pump 8 The displacement is 20% larger than that of the second melt pump 9 .

[0030] Other technical features of this embodiment are the same as those of Embodiment 1.

[0031] Specific application implementation: The melt index of the PVDF raw material used is 6.8g / 10min (230°C, 5Kg); the feeding hopper is heated to 70°C, and PVDF passes through the screw, filter screen, two-stage melt pump (the first melt pump and The second melt pump) after extrusion, the experiment shows that: PVDF has good plasticizing effect, the surface of the extruded product is smooth and shiny, and the pressure fluctuation range of the extrusion outlet is ±0.01MPa.

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Abstract

The invention discloses a special precision extrusion system for polyvinylidene fluoride, the purpose of which is to overcome the poor plasticizing effect and large fluctuation of extrusion outlet pressure when extruding PVDF by extrusion equipment on the market, which seriously affects the quality of extruded products. The problem. The invention includes a motor, a gear box, a feeding hopper, a screw, a machine barrel and a heating ring installed on the machine barrel. The motor drives the screw to rotate after the gear box changes speed. The feeding hopper is installed on the machine barrel at the root of the screw, and is connected with the The feed port of the machine barrel is connected, and the barrel discharge port of the screw head is provided with a filter screen, and a melt pump is installed on the barrel discharge port at the front side of the filter screen, and the melt pump communicates with the machine barrel discharge port. The invention has good plasticizing effect in processing PVDF, has slight fluctuation of extrusion outlet pressure, and can realize precise extrusion of PVDF.

Description

technical field [0001] The invention relates to the field of plastic molding processing, in particular to a special precision extrusion system for polyvinylidene fluoride. Background technique [0002] Polyvinylidene fluoride, namely PVDF, is a material with excellent performance, which has excellent weather resistance, chemical corrosion resistance, oxidation resistance and radiation resistance. In recent years, polyvinylidene fluoride materials have begun to be used in water treatment, solar energy, and medical catheters, and are used in the production of PVDF ultrafiltration membranes, PVDF films for battery protection, and PVDF interventional catheter tubing. These products have high technical threshold, high added value and huge market, and they are attracting more and more attention. Since PVDF is a thermoplastic polymer material, it can be processed by extrusion molding, that is, screw extruder and corresponding auxiliary machines are used to realize the feeding, tra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C47/38B29C47/60B29C47/68B29C47/82B29C48/53B29C48/37B29C48/395
CPCB29C48/37B29C48/395B29C48/53
Inventor 郑泓顾方明
Owner 郑泓
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