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Device and process for on-line regulating and controlling melt strength of polymers

A melt strength and polymer technology, applied in the extrusion field of low melt strength polymers, can solve the problems of low melt strength, limited application range, poor product molding performance and usability, etc., and achieve strong product applicability , cost-saving effect

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

Almost all thermoplastic polymers can be used for extrusion molding, but certain polymer materials such as fully biodegradable polylactic acid for film production or polypropylene for extrusion blow molding or extrusion foam molding, Due to its low melt strength when it is released from the mold, the molding performance and service performance of the product are poor, which greatly limits its application range

Method used

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  • Device and process for on-line regulating and controlling melt strength of polymers
  • Device and process for on-line regulating and controlling melt strength of polymers
  • Device and process for on-line regulating and controlling melt strength of polymers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] refer to figure 1 , figure 2 , image 3 As shown, a device for online regulation of polymer melt strength, the device includes sequentially connected feeding system 3, a first-stage screw extruder 1, a connecting body I6, a dynamic mixer 7, a connecting body II10, and a second-stage Screw extruder 11, extruder die 14.

[0027] The dynamic mixer includes: a temperature control system, a pressure monitoring system, a mixing transmission system, and a dynamic mixer rotor.

[0028] The rotors of the dynamic mixer are a pair of vertically placed rotors rotating in the same direction.

[0029] The first-stage screw extruder 1 is provided with a feeding system 3 , a first-stage screw extruder transmission mechanism 2 and a first-stage screw 5 . The connector I6 connects the primary screw extruder 1 and the dynamic mixer 7 . The dynamic mixer 7 is provided with a dynamic mixer transmission mechanism 8 and a dynamic mixer rotor 9 . The connecting body II10 connects the dy...

Embodiment 2

[0035] Embodiment 2 has the same functions as those in Embodiment 1, and will not be repeated for the sake of brevity.

Embodiment 2

[0036] Example 2 is different from Example 1 in that its process is different: when working, mix 99.0% isotactic polypropylene, α nucleating agent DMDBS0.8%, and compatibilizer 0.2% with a high-speed mixer for 3 to 5 Minutes, feed into the feeding system 3, pass through the twin-screw extruder, connecting body I6, dynamic mixer 7, connecting body II10, single-screw extruder, and extrude through the die 14 of the extruder.

[0037] The process temperature of the twin-screw extruder: zone 1 is 160°C, zone 2 is 175°C, zone 3 is 180°C, zone 4 is 190°C, zone 5 is 190°C, zone 6 is 180°C. The process temperature of the linker I6: 165°C. The process temperature of the dynamic mixer 7: 135°C. Process temperature of the linker II10: 150°C. The process temperature of the single-screw extruder: the first zone is 150°C, the second zone is 150°C, the third zone is 160°C, and the fourth zone is 165°C. The process temperature of the die 14 of the extruder: 168°C.

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PUM

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Abstract

The invention provides a device and process for on-line regulating and controlling the melt strength of polymers. The device comprises a feeding system, a first-stage screw extruder, a connector I, adynamic mixer, a connector II, a second-stage screw extruder and an extruder neck mould which are connected in sequence. According to the device and process for on-line regulating and controlling themelt strength of the polymers, step temperature control is carried out on a series extrusion unit in the extrusion process of the polymers, an enhanced melt structure with partial molten crystals is successfully introduced to realize the on-line regulation and control of the melt strength of the polymers, and through the subsequent arrangement of corresponding auxiliary machines, the production ofproducts such as blown films, stretching films, extrusion blow molding and extrusion sheet sheets of the polymers with a low melt strength is realized.

Description

technical field [0001] The invention relates to the design of extruder tandem units in the field of polymer processing and the technology of on-line regulation of polymer melt strength, especially the extrusion of low melt strength polymers and related molding technology and technology. Background technique [0002] Extrusion molding is a very important molding method in polymer processing. Generally, screw extruders can be used to produce continuous extruded products with specific cross-sectional shapes, and extruders can also be used as the host of other molding process production lines. Almost all thermoplastic polymers can be used for extrusion molding, but certain polymer materials such as fully biodegradable polylactic acid for film production or polypropylene for extrusion blow molding or extrusion foam molding, Due to its low melt strength when it is released from the mold, the molding performance and service performance of the product are poor, which greatly limits ...

Claims

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Application Information

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IPC IPC(8): B29C48/455B29C48/465B29C48/92
Inventor 陈静波张晓黎纪又新付龙张世勋刘保臣
Owner ZHENGZHOU UNIV