Method for preparing extruding physical foaming polypropylene bead granule

A technology of physical foaming and polypropylene, which is applied in the production process of extruding foamed polypropylene beads, can solve the problems of low melting point of the product and unsuitability for use in high-temperature places, and achieve simple production equipment, low energy consumption, The effect of high foaming ratio

Inactive Publication Date: 2009-01-28
浙江华江科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that random copolymerized polypropylene with low melting point is used, and the obtained product has a low melting point, which is not suitable for use in high temperature places.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Set the injection port in the middle of the barrel of the single-screw extruder, install a sleeve-type die and a die-face pelletizer on the machine head, and mix 1Kg of high-melt strength polypropylene, 0.004Kg of talcum powder and 0.002Kg of antioxidant 1010 evenly Finally, add it to the single-screw extruder, inject 0.17Kg of butane foaming agent into the barrel from the injection port, control the die pressure to 5MPa, and the die temperature to 130°C, so that the pelletized material will Foaming, cooling in a water ring, drying in a centrifugal dryer and a fluid bed dryer to obtain expanded polypropylene beads, the expansion ratio of which is 25 times.

Embodiment 2

[0020] The injection port is set in the middle of the barrel of two series-connected single-screw extruders, and the sleeve type die and die surface pelletizer are installed on the machine head, and 1Kg of high melt strength polypropylene, 0.25Kg of homopolypropylene and its 0.008Kg talcum powder, 0.002Kg antioxidant 168 and 0.006Kg oleyl stearate are mixed and added in the single-screw extruder, and the n-pentane foaming agent of 0.2Kg is injected in the machine barrel from the injection port, and the control port The mold pressure is 15MPa, and the die temperature is 114°C, so that the granulated material will foam when it enters the atmosphere, cooled in a water ring, and dried in a centrifugal dryer and a fluid bed dryer to obtain expanded polypropylene beads. Beads, the expansion ratio of beads is 38 times.

Embodiment 3

[0022] The injection port is set in the middle of the barrel of two series-connected single-screw extruders, and the sleeve type die and die surface pelletizer are installed on the machine head, and 1Kg of high melt strength polypropylene, 0.1Kg of random polypropylene and its 0.006Kg of talcum powder, 0.002Kg of antioxidant 1010 and 0.006Kg of stearate are mixed evenly and added to the single-screw extruder, and 0.25Kg of propane foaming agent is injected into the machine barrel from the injection port to control the die pressure The die temperature is 28MPa, and the die temperature is 150°C, so that the granulated material will foam when it enters the atmosphere, cooled in a water ring, and dried in a centrifugal dryer and a fluidized bed dryer to obtain expanded polypropylene beads. The expansion ratio of the beads is 45 times.

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PUM

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Abstract

The invention discloses a preparation method of an extrusion physical foaming polypropylene bead; the method is as follows: an injector port is arranged at the middle of a machine barrel of a screw extruder, a machine head is provided with a bushing type neck ring mold and a die surface chip cutter, polypropylene foaming material and addition agents are added into the screw extruder, alkane foaming agent is injected into the machine barrel from the injector port, the proportion by weight between the polypropylene foaming material and the alkane foaming agent is 10-25%, the pressure of the neck ring mold is controlled to be 5-30MPa, and the temperature of the neck ring mold is 110-150 DEG C, thus leading the cut material to generate foams when the material enters the atmosphere, and then the product is obtained after cooling and drying. The method of the invention has the advantages of continuous extrusion of the polypropylene foaming beads, low energy consumption, little environmental pollution due to the adoption of the alkane foaming agent, low residue of foaming agent in the foaming bead and high foaming rate.

Description

technical field [0001] The invention relates to a production process for extruding foamed polypropylene beads, which belongs to the field of polymer foaming materials. Background technique [0002] In addition to the characteristics of general foaming products such as light weight, heat insulation, sound insulation, cushioning and shock resistance, high specific strength, and low price, foamed polypropylene plastics also have good thermal stability (the maximum use temperature is 120°C, while foaming Polystyrene and polyethylene are only 70 ℃ ~ 80 ℃), good stress cracking resistance (this performance is necessary for greasy food packaging) and dimensional stability of products at high temperatures, high toughness and high Tensile strength and impact strength, conformable and supple surface, excellent microwave adaptability. Moreover, due to the existence of a methyl group on the polypropylene molecule, its chemical structure determines that the degradation performance of po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C69/00B29C44/00B29C47/00B29C47/10C08J9/14C08L23/10B29K23/00
Inventor 马国维黄锦伟杨春壮
Owner 浙江华江科技股份有限公司
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