A process for preparing microporous tubes by semi-melt continuous extrusion of polymer powder

Abstract

The invention relates to a process for preparing microporous tubes by semi-melt continuous extrusion of polymer powder, which is characterized in that it includes the following steps: (1) adding solid powder materials into a screw extrusion device through a hopper; (2) entering The barrel of the screw extrusion device is heated, and at the same time, the material is initially compacted by the screw, and the material becomes a semi-molten state; (3) The material enters the machine head and is further compacted; (4) The material enters the die of the screw extrusion device The mold cavity is formed into a tube shape, and the inner and outer diameters are determined under the action of the vacuum cooling calibrating sleeve, and the preliminary cooling is performed; (5) The microporous tube is cut by a cutting device. The technology of the invention is to carry out continuous extrusion molding when the polymer powder is in a semi-molten state. While realizing the continuous production of the microporous tube, the produced product does not need post-processing, thereby greatly improving the production efficiency. Because the process of the invention does not use solvent, it is beneficial to environmental protection and the health of operators.

Description

technical field

[0001] The invention relates to a molding process of polymer microporous materials, in particular to a molding process of polymer microporous tubes. Background technique

[0002] At present, the molding methods of microporous materials at home and abroad include: polymer particle sintering method, thermal phase separation method, inorganic particle filling method and melt extrusion stretching method, etc. Among them, the polymer particle sintering method is a method in which particles of a certain particle size are loaded into corresponding molds and sintered at high temperature to obtain microporous materials. It is a discontinuous production method with low production efficiency; thermally induced phase separation method is to The polymer dissolves in a specific solvent at high temperature to form a homogeneous solution. When the temperature decreases, the solid-liquid phase separation occurs in the homogeneous system. After the solvent is removed, the spac...

Examples

Embodiment Construction

[0031] The present invention will now be further described in detail in conjunction with the accompanying drawings and embodiments, and these accompanying drawings are simplified schematic diagrams.

[0032] Such as figure 1 Shown, a kind of technology that polymer powder semi-melt continuous extrusion prepares microporous tube comprises the following steps:

[0033] (1) The solid powder material is fed into the screw extrusion device through the hopper;

[0034] (2) The material enters the barrel of the screw extrusion device for heating, and at the same time, it is initially compacted by the screw of the screw extrusion device, and the material becomes a semi-molten state;

[0035] (3) The material enters the head 2 of the screw extrusion device and is further compacted by the compression of the head 2;

[0036] (4) The material enters the cavity of the die 4 of the screw extrusion device and is formed into a tubular shape, and the inner and outer diameters are determined ...

technical field

[0001] The invention relates to a molding process of polymer microporous materials, in particular to a molding process of polymer microporous tubes. Background technique

[0002] At present, the molding methods of microporous materials at home and abroad include: polymer particle sintering method, thermal phase separation method, inorganic particle filling method and melt extrusion stretching method, etc. Among them, the polymer particle sintering method is a method in which particles of a certain particle size are loaded into corresponding molds and sintered at high temperature to obtain microporous materials. It is a discontinuous production method with low production efficiency; thermally induced phase separation method is to The polymer dissolves in a specific solvent at high temperature to form a homogeneous solution. When the temperature decreases, the solid-liquid phase separation occurs in the homogeneous system. After the solvent is removed, the spac...

Examples

Embodiment Construction

[0031] The present invention will now be further described in detail in conjunction with the accompanying drawings and embodiments, and these accompanying drawings are simplified schematic diagrams.

[0032] Such as figure 1 Shown, a kind of technology that polymer powder semi-melt continuous extrusion prepares microporous tube comprises the following steps:

[0033] (1) The solid powder material is fed into the screw extrusion device through the hopper;

[0034] (2) The material enters the barrel of the screw extrusion device for heating, and at the same time, it is initially compacted by the screw of the screw extrusion device, and the material becomes a semi-molten state;

[0035] (3) The material enters the head 2 of the screw extrusion device and is further compacted by the compression of the head 2;

[0036] (4) The material enters the cavity of the die 4 of the screw extrusion device and is formed into a tubular shape, and the inner and outer diameters are determined ...

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