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Polypropylene and blends particles thereof physical gas foaming preparation method

A technology of gas foaming and polypropylene, applied in the field of physical gas foaming of high polymer particles, can solve the problems of complex production process, low production efficiency, high production cost, etc., to reduce production cost, improve production efficiency, and reduce pressure holding the effect of time

Inactive Publication Date: 2009-12-30
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These two methods have their own advantages and disadvantages. The production efficiency of extrusion foaming and pelletizing is very high, but it has higher requirements on the melt strength of polypropylene itself, and generally requires the use of special materials with higher melt strength, so its high production cost
Although the immersion method does not have very high requirements for the melt strength of polypropylene, its production efficiency is low, the temperature control accuracy of the reactor is high, and the production process is relatively complicated.

Method used

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  • Polypropylene and blends particles thereof physical gas foaming preparation method
  • Polypropylene and blends particles thereof physical gas foaming preparation method
  • Polypropylene and blends particles thereof physical gas foaming preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0045] Place the random copolymerized polypropylene particles in a high-pressure mold with good airtight performance to ensure that the total volume of the particles does not exceed 1 / 25 of the mold volume, so that the particles have enough space for foaming. Filled with high pressure N at a temperature of 135°C 2 , the pressure is controlled at 20MPa, kept at constant temperature and pressure for 19min, and the pressure is released to normal pressure at a speed of 20MPa / s. Then the expanded particles are taken out from the mould, cooled to obtain the expanded particles, and the expanded density of the analyzed and tested expanded particles is 0.30g / cm 3 , with an average pore size of 30 μm.

Embodiment 2

[0047] The block copolymerized polypropylene particles are placed in a high-pressure mold with good airtight performance to ensure that the total volume of the particles does not exceed 1 / 25 of the mold volume, so that the particles have enough space for foaming. Filled with high pressure N at a temperature of 175°C 2 , the pressure is controlled at 20MPa, kept at constant temperature and pressure for 10min, and the pressure is released to normal pressure at a speed of 5MPa / s. Then the expanded particles are taken out from the mould, cooled to obtain the expanded particles, and the expanded density of the analyzed and tested expanded particles is 0.47g / cm 3 , with an average pore size of 270 μm.

Embodiment 3

[0049] Place the homopolymerized polypropylene particles in a high-pressure mold with good airtight performance to ensure that the total volume of the particles does not exceed 1 / 25 of the mold volume, so that the particles have enough space for foaming. Filled with high pressure N at a temperature of 168°C 2 , the pressure is controlled at 20MPa, kept at constant temperature and pressure for 5 minutes, and the pressure is released to normal pressure at a speed of 10MPa / s. Then the expanded particles are taken out from the mould, cooled to obtain the expanded particles, and the expanded density of the analyzed and tested expanded particles is 0.047g / cm 3 , with an average pore size of 190 μm.

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Abstract

The invention discloses a polypropylene and blends particles thereof physical gas foaming preparation method and is characterized in that the preparation method comprises the following steps: placing polypropylene and blends particles thereof in a high pressure container of which the volume is 25 times or more than 25 times of the total volume of the particles, injecting 10-20MPa of pressure gas in the container at 135-175 DEG C, keeping the temperature and the pressure for 1-30min and then relieving the pressure in a speed of 5-20MPa / s to the normal pressure to obtain the foaming particles with uniform and controllable cell and controllable foaming density. The preparation method of the invention overcomes the specific requirement that polypropylene with high melt strength is needed to use in the foaming process, and the increase of the machining temperature increases the gas permeability and shortens holding time so as to improve the production efficiency and reduce the production cost.

Description

Technical field: [0001] The invention relates to a method for preparing polypropylene and its blend particle physical gas foaming, belonging to the field of high polymer particle physical gas foaming. Background technique: [0002] Foamed material is a kind of aggregate formed by gas dispersed in solid polymer. It has the advantages of light weight, heat insulation, cushioning and insulation, so it has a wide range of applications in many fields. Currently the most widely used foam materials are polystyrene foam (EPS), polyurethane foam (EPU) and polyethylene foam (EPE), but they all have certain limitations in use. EPS cannot be degraded and its use is now prohibited; toxic monomers remain in EPU and cannot be effectively removed; although EPE is non-toxic, its heat resistance is not good. Polypropylene foam (EPP) has gradually become a research and development hotspot due to its advantages of degradability, non-toxicity, good high temperature resistance, abundant raw mate...

Claims

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Application Information

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IPC IPC(8): C08J9/30C08L23/12C08L23/14C08L53/00C08L23/06
Inventor 李文光虞晨阳王亚吴炳田
Owner SICHUAN UNIV
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