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Isotatic polypropylene extrusion foaming device and process

An isotactic polypropylene, extrusion foaming technology, applied in the field of serial screw extrusion foaming devices, can solve the problems of easy collapse, low melt strength, and fast dissipation of foaming agent, and improve extrusion efficiency. , The effect of reducing production cost and improving cooling efficiency

Pending Publication Date: 2019-07-02
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under conventional equipment and process molding conditions, when isotactic polypropylene is extruded and foamed in a molten state, due to its low melt strength, the foaming agent escapes quickly, resulting in too thin cell walls and prone to collapse , merging and other product molding defects, it is difficult to obtain products with uniform cell morphology and good mechanical properties
The price of currently commercially available high melt strength grafted polypropylene is twice or even higher than that of isotactic polypropylene, which limits its large-scale use and industrial application process

Method used

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  • Isotatic polypropylene extrusion foaming device and process
  • Isotatic polypropylene extrusion foaming device and process
  • Isotatic polypropylene extrusion foaming device and process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] refer to figure 1 , figure 2 , image 3 , Figure 4 , Figure 5 As shown, it includes a twin-screw extruder 3, a twin-cylinder air pump 7, a melt pump 10, and a single-screw extruder 14 arranged in sequence.

[0034] The melt pump 10 includes: a melt pump transmission system 9 , a melt pump rotor 17 , a melt pump heating system 18 , and a melt pump cooling system 19 . The melt pump cooling system 19 is provided with a cooling pipeline (not shown in the figure).

[0035] The melt pump cooling system 19 is provided in the melt pump housing. The melt pump rotor 17 is a gear structure. The gear structure is a straight tooth type.

[0036] The single-screw extruder 14 adopts a single-screw 15 with a diameter of ф45mm, and the power of the transmission motor of the transmission system 12 of the single-screw extruder is 30KW, and a thrust bearing is used. The motor power of the melt pump transmission system 9 is 10KW.

[0037] The twin-screw extruder 3 is provided wi...

Embodiment 2

[0047] Embodiment 2 has the same functions as those in Embodiment 1, and will not be repeated for the sake of brevity.

Embodiment 2

[0048] Example 2 is different from Example 1 in that its formulation and process are different: when working, mix 99.0% isotactic polypropylene and nucleating agent DMDBS1.0% with a high-speed mixer for 5 minutes, and open the double-cylinder air pump 7 And valve 6, put the raw material into the hopper 2, after passing through the twin-screw extruder 3, connecting body I8, melt pump 10, connecting body II11, single-screw extruder 14, and extruding through the single-screw extruder head 16 out.

[0049] The process temperature of the twin-screw extruder 3: 160°C in the first zone, 175°C in the second zone, 180°C in the third zone, 190°C in the fourth zone, 190°C in the fifth zone, 185°C in the sixth zone, and 180°C in the seventh zone. The process temperature of the linker I8: 165°C. Process temperature of the melt pump 10: 155°C. The process temperature of the linker II11: 145°C. The process temperature of the single-screw extruder 14 is: 135°C in the first zone, 145°C in t...

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Abstract

The invention discloses an isotatic polypropylene extrusion foaming device and process. The device comprises a double-screw extruder, a duplex air pump, a melt pump and a single screw extruder which are arranged in sequence. According to the isotatic polypropylene extrusion foaming device and process, through temperature and pressure control of the melt pump and the single screw extruder, the isotatic polypropylene melt strength is enhanced online; and by adopting the structural design of a screw of the single screw extruder in a matched mode, isotatic polypropylene extrusion foaming forming is achieved.

Description

technical field [0001] The invention belongs to the technical field of polymer processing, and in particular relates to a tandem screw extrusion foaming device and process. Background technique [0002] Isotactic polypropylene is a general-purpose polymer with linear molecular structure characteristics. Compared with other polyolefin materials such as polyethylene and other types of polymers such as polystyrene and polyvinyl chloride, it has a higher thermal denaturation temperature , non-toxic, easy to recycle and other advantages, is a green and widely used synthetic resin material. Foamed polymers have the advantages of light weight, energy saving, and high impact resistance, and have been widely used in packaging, daily necessities, home appliances, and automobile industries. Under conventional equipment and process molding conditions, when isotactic polypropylene is extruded and foamed in a molten state, due to its low melt strength, the foaming agent escapes quickly, ...

Claims

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Application Information

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IPC IPC(8): B29C48/00B29C48/375B29C48/59B29C48/625B29C48/285B29C48/80B29C48/86B29C44/36B29K23/00
CPCB29C44/36B29K2223/12
Inventor 张晓黎陈静波付龙史乾坤杨扬刘保臣
Owner ZHENGZHOU UNIV
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