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A kind of thermoplastic polymer foam beads and preparation method thereof

A technology of thermoplastic polymers and foamed beads, which is applied in the field of polymer foaming, can solve the problems of uneven cell size, long saturation time, and high production cost of foamed beads, and achieve uniform cell size and apparent appearance. Fewer defects and reduced energy consumption

Active Publication Date: 2020-06-05
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the high energy consumption, cumbersome process, high production cost, long saturation time and uneven cell size of the foamed beads obtained in the autoclave preparation technology of thermoplastic polymer foamed beads. problems, thereby providing a thermoplastic polymer foamed beads and a preparation method thereof, which reduces energy consumption, simplifies the process, reduces production costs, shortens the foaming time, and improves the cell size of the resulting foamed beads Uniformity of size

Method used

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  • A kind of thermoplastic polymer foam beads and preparation method thereof
  • A kind of thermoplastic polymer foam beads and preparation method thereof
  • A kind of thermoplastic polymer foam beads and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Such as figure 1 , add average diameter 3.8mm, T to spouted bed 1 m polyethylene beads at 119°C to 35% of the bed volume; start the carbon dioxide injection pump 3, feed carbon dioxide from the carbon dioxide storage tank 2 to replace the air in the system, seal the system and maintain it under a carbon dioxide atmosphere; The bed layer of the moving bed 1 is heated by program temperature control, the heating rate is 5°C / min, and heated to a foaming temperature of 105°C; continue to inject carbon dioxide, control the injection pressure of carbon dioxide to 15MPa, open the valve 64, and make the foaming temperature in the spouted bed 1 The carbon dioxide is in a supercritical state; start the circulation pump 4, open the valve 62 and valve 63, and carry out the carbon dioxide circulation operation through the filter 5, the spray speed is 0.30m / s, keep the spray state for 25min, and make the polyethylene beads reach saturation State: close valve 62, valve 63, and valve 6...

Embodiment 2

[0039] Such as figure 1 , add average diameter 1.8mm, T to the bed layer of spouted bed 1 m Polypropylene beads at 165°C to 40% of the bed volume; start the carbon dioxide injection pump 3, feed carbon dioxide from the carbon dioxide storage tank 2 to replace the air in the system, seal the system and maintain it under a carbon dioxide atmosphere; The bed layer of the moving bed 1 is heated by program temperature control, the heating rate is 5°C / min, and heated to a foaming temperature of 147°C; continue to inject carbon dioxide, control the injection pressure of carbon dioxide to 12MPa, open the valve 64, and make the foaming temperature in the spouted bed 1 When the carbon dioxide is in a supercritical state, start the circulation pump 4, open the valve 62 and valve 63, and carry out the carbon dioxide circulation operation through the filter 5. The spray speed is 0.25m / s, and keep the spray state for 30 minutes to make the polypropylene beads reach saturation State: close ...

Embodiment 3

[0041] Such as figure 1 , add average diameter 3.5mm, T to the bed layer of spouted bed 1 mThermoplastic polyurethane beads at 135°C to 45% of the bed volume; start the carbon dioxide injection pump 3, feed carbon dioxide from the carbon dioxide storage tank 2 to replace the air in the system, seal the system and maintain it under a carbon dioxide atmosphere; The bed layer of the moving bed 1 is heated by program temperature control, the heating rate is 5°C / min, and heated to a foaming temperature of 120°C; continue to inject carbon dioxide, control the injection pressure of carbon dioxide to 15MPa, open the valve 64, and make the foaming temperature in the spouted bed 1 Carbon dioxide is in a supercritical state, start the circulation pump 3, open valve 62 and valve 63 to carry out carbon dioxide circulation operation, the spray speed is 0.42m / s, keep the spray state for 28min, and the thermoplastic polyurethane beads reach a saturated state; close valve 62, valve 63. Valve ...

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Abstract

The invention discloses thermoplastic polymer foaming beads and a preparation method thereof. The method comprises the following steps: adding the thermoplastic polymer foaming beads into a spouted bed and introducing carbon dioxide to replace air; heating the spouted bed to foaming temperature and continually injecting the carbon dioxide to enable the carbon dioxide to be at a supercritical state; carrying out carbon dioxide circulation to keep the thermoplastic polymer foaming beads in a bed layer at a spouted state; carrying out pressure relief on the spouted bed to discharge supercriticalcarbon dioxide in the bed layer, so as to obtain the thermoplastic polymer foaming beads. According to the method disclosed by the invention, energy consumption is reduced and a process procedure is simplified, so that the production cost is reduced; the foaming time is shortened and the size uniformity of foam holes of the obtained foaming beads is improved.

Description

technical field [0001] The invention belongs to the field of polymer foaming, in particular to a thermoplastic polymer foaming bead and a preparation method thereof. Background technique [0002] Polymer foam material is a kind of gas / solid two-phase composite material with polymer as matrix and gas as dispersed phase, because its unique microporous structure can improve the shape and structure of polymer materials, so that it has light weight , low thermal conductivity, excellent heat insulation and sound insulation performance, high specific strength, etc. The above advantages have also promoted the wide application of polymer foam materials, providing lightweight basic raw materials for aerospace, transportation, new energy packaging, electrical appliances, sports equipment, etc. [0003] At present, the molding processes of thermoplastic foam materials mainly include extrusion foam molding, injection foam molding, bead molding foam molding, and compression foam molding....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J9/16C08L23/06C08L23/12C08L75/04
CPCC08J9/16C08J2201/032C08J2323/06C08J2323/12C08J2375/04
Inventor 赵玲许志美刘涛姚舜宗原
Owner EAST CHINA UNIV OF SCI & TECH
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