Device and method for preparing low-density polymeric foam beads by utilizing extrusion and foaming of supercritical mixed fluid

A technology of supercritical fluid and mixed fluid, applied in the direction of coating, etc., can solve the problems of small expansion ratio, low production efficiency, poor adaptability of different polymer materials, etc., and achieve the effect of high porosity and large-scale precise regulation

Active Publication Date: 2019-01-18
福建鑫瑞新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The main problems in the current preparation of polymer foam beads by extrusion foaming include: 1) the lack of mature and stable special extrusion foaming systems and equipment;

Method used

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  • Device and method for preparing low-density polymeric foam beads by utilizing extrusion and foaming of supercritical mixed fluid
  • Device and method for preparing low-density polymeric foam beads by utilizing extrusion and foaming of supercritical mixed fluid
  • Device and method for preparing low-density polymeric foam beads by utilizing extrusion and foaming of supercritical mixed fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] device as figure 1 The shown "Using Supercritical Mixed Fluid Extrusion and Foaming Device to Prepare Low-density Polymer Foam Beads", the raw material is thermoplastic polyurethane, and its melt index and density are 12g / 10min (@220℃ / 10kg), 1.18g / cm 3 (@23°C); supercritical fluid I is carbon dioxide with a purity of 99.9%, and supercritical fluid II is nitrogen with a purity of 99.5%; the injection amount of carbon dioxide is 2.5% by weight, and the injection amount of nitrogen is 0.25% by weight.

[0061] The diameter of the screw of the twin-screw extruder is 80mm, and its aspect ratio is 40. The temperature of the twin-screw is set at 180°C; ℃–200℃–200℃–200℃–200℃–200℃–190℃–180℃–170℃–170℃, the screw speed is 30 rpm; two supercritical fluids on the barrel of the twin-screw extruder The distance between the injection port and the hopper is 5 times the screw diameter and 10 times the screw diameter; the temperature of the static mixer is set to 150°C; the control pre...

Embodiment 2

[0064] device as figure 1 The shown "Using Supercritical Mixed Fluid Extrusion and Foaming Device to Prepare Low-density Polymer Foam Beads", the raw material is high-melt strength polypropylene, and its melt index and density are 16g / 10min (@230℃ / 2.16 kg), 0.90g / cm 3 (@23°C); supercritical fluid I is carbon dioxide with a purity of 99.9%, and supercritical fluid II is nitrogen with a purity of 99.5%; the injection amount of carbon dioxide is 5.0% by weight, and the injection amount of nitrogen is 0.32% by weight.

[0065] The diameter of the screw of the twin-screw extruder is 60mm, its aspect ratio is 50, and the temperature of the twin-screw is set at 170°C; the temperature of the barrel of the twin-screw extruder is set at 60°C–160°C–180 ℃–180℃–180℃–180℃–180℃–180℃–180℃–170℃–170℃–170℃, the screw speed is 30 rpm; two supercritical fluids on the barrel of the twin-screw extruder The distance between the injection port and the hopper is 10 times the screw diameter and 18 tim...

Embodiment 3

[0068] device as figure 1 The shown "Using Supercritical Mixed Fluid Extrusion and Foaming Device to Prepare Low-density Polymer Foam Beads", the raw material is high-melt strength polypropylene, and its melt index and density are 16g / 10min (@230℃ / 2.16 kg), 0.90g / cm 3 (@23°C); supercritical fluid I is carbon dioxide with a purity of 99.9%, and supercritical fluid II is nitrogen with a purity of 99.5%; the injection amount of carbon dioxide is 4.0% by weight, and the injection amount of nitrogen is 0.2% by weight.

[0069] The diameter of the screw of the twin-screw extruder is 100mm, and its aspect ratio is 60. The temperature of the twin-screw is set at 180°C; ℃–200℃–200℃–200℃–200℃–190℃–190℃–180℃–170℃–170℃, the screw speed is 25 rpm; two supercritical fluids on the barrel of the twin-screw extruder The distance between the injection port and the hopper is 15 times the screw diameter and 25 times the screw diameter; the temperature of the static mixer is set to 155°C; the co...

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Abstract

The invention discloses a device and a method for preparing low-density polymeric foam beads by utilizing extrusion and foaming of supercritical mixed fluid. The device comprises an extruding and mixing unit, a supercritical fluid injection unit, a static mixing unit, a gear pump, a melt cooler, an extruding mold head and an underwater granulating system and the like, wherein the main body of theextruding and mixing unit is a double-screw extruder, screws and a charging barrel are respectively equipped with a special temperature control unit, and the charging barrel is provided with two gas-injecting holes; the static mixing unit is arranged at the downstream of the extruding and mixing unit so as to enhance the mixing effect; the gear pump is arranged at the downstream of the static mixing unit so as to regulate the system pressure; the melt cooler is connected at the downstream of the gear pump so as to regulate the system temperature. The device and method disclosed by the invention have the advantages that the process is stable, the production efficiency is high, and the prepared polymeric foam beads are low in density and uniform in structure.

Description

technical field [0001] The invention belongs to the technical field of plastic forming processing, in particular to a device and method for preparing low-density polymer foam beads by extruding and foaming supercritical mixed fluid. Background technique [0002] Polymer foam beads are a kind of bead-like substance with a porous structure obtained by foaming a polymer as a matrix. Through steam molding or bonding molding, polymer foam beads can be processed into block foam products with a certain geometric structure, which has the advantages of material saving, light weight, energy absorption, high specific strength, large specific surface area, heat insulation, Noise reduction and other characteristics are widely used in packaging, construction, transportation, sports equipment and other fields. Currently, polymer foam beads are mainly prepared by autoclave foaming. The process control of the kettle pressure foaming method is relatively simple, but its production efficienc...

Claims

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Application Information

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IPC IPC(8): B29B9/06B29B9/16B29B13/06
CPCB29B9/065B29B9/16B29B13/065
Inventor 王桂龙赵国群潘涵遇
Owner 福建鑫瑞新材料科技有限公司
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