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Method for producing supercritical CO#-[2] foamed universal polypropylene resin

A technology of polypropylene resin and foamed polypropylene, which is applied in the field of preparing general-purpose foamed polypropylene, can solve the problems of increasing the cost of foamed polypropylene materials, and achieve the effect of reducing production costs

Inactive Publication Date: 2008-01-23
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the foaming quality is improved by changing the properties of the polypropylene to be foamed, which greatly increases the cost of producing foamed polypropylene materials.

Method used

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  • Method for producing supercritical CO#-[2] foamed universal polypropylene resin
  • Method for producing supercritical CO#-[2] foamed universal polypropylene resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The isotactic homopolypropylene particles are placed in the autoclave, wherein the volume of the polypropylene particles is not more than one-twentieth of the volume of the autoclave, so as to ensure that the polypropylene has enough space for foaming and molding. Then fill in low-pressure carbon dioxide to replace the air in the kettle, then fill in high-pressure carbon dioxide, raise the temperature of the autoclave to 140° C., control the pressure to 20 MPa, and swell and penetrate for 30 minutes. Then quickly release the pressure until the gauge pressure is 0, control the pressure release rate to 10MPa / s, and cool the autoclave to 5°C. The sample was taken out, and the appearance of the sample remained grainy. Scanning electron microscope analysis was performed on its section. The pore diameter of the expanded polypropylene material sample is 25-30 μm, and the pore density is 3.1×10 6 piece / cm 3 , The foamed material sample expands about 7 times compared with the...

Embodiment 2

[0032] The isotactic homopolypropylene particles are placed in the autoclave, wherein the volume of the polypropylene particles is not more than one-twentieth of the volume of the autoclave, so as to ensure that the polypropylene has enough space for foaming and molding. Then fill in low-pressure carbon dioxide to replace the air in the kettle, then fill in high-pressure carbon dioxide, raise the temperature of the autoclave to 170°C, control the pressure to 30MPa, and swell and penetrate for 5 minutes. Then quickly release the pressure to a gauge pressure of 0 MPa, control the pressure release rate to 30 MPa / s, and cool the autoclave to 30°C. The sample was taken out, and the appearance of the sample was a whole piece of foaming material, and its section was analyzed by scanning electron microscope, as shown in Figure 1 and Figure 2. Figure 1 is a photo magnified 100 times, and Figure 2 is a photo magnified 300 times. The average pore diameter of the expanded polypropylene m...

Embodiment 3

[0034] The random copolymerized polypropylene particles are placed in the autoclave, wherein the volume of the polypropylene particles is not greater than one-twentieth of the volume of the autoclave, so as to ensure that the polypropylene can have enough space for foaming and molding. Then fill in low-pressure carbon dioxide to replace the air in the kettle, then fill in high-pressure carbon dioxide, increase the temperature of the autoclave to 130° C., control the pressure to 15 MPa, and swell and penetrate for 30 minutes. Then quickly release the pressure to a gauge pressure of 0 MPa, control the pressure release rate to 10 MPa / s, and cool the autoclave to 5°C. The sample was taken out, and its section was analyzed by scanning electron microscope, as shown in Figure 3 and Figure 4. Fig. 3 is a photo enlarged by 150 times, and Fig. 4 is a photo enlarged by 500 times. The average pore diameter of the expanded polypropylene material sample is 20-30 μm, and the pore density is...

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Abstract

The supercritical CO2 process of foaming universal polypropylene resin includes the following steps: swelling and penetrating polypropylene in supercritical CO2 fluid for 0.5-1 hr, and fast relieving pressure and cooling. The process can obtain foamed polypropylene material with homogeneous closed micropores in controlled size. The present invention foams common isotactic propylene homopolymer and atactic propylene copolymer by means of altered foaming technological process and this lowers production cost greatly.

Description

technical field [0001] The present invention relates to a kind of preparation method of polypropylene, especially to a kind of using supercritical CO 2 A method for preparing foamed general-purpose polypropylene by swelling and infiltration. Background technique [0002] Foam plastic has the advantages of light weight, heat insulation, sound insulation, cushioning, high specific strength, and low price, so it is widely used in the fields of packaging, industry, agriculture, transportation, military industry, aerospace industry, and daily necessities. In recent years, the demand in the international and domestic markets has continued to grow rapidly. The main varieties of foamed plastics are polyurethane (PUR) soft and rigid foamed plastics, polystyrene (PS) and polyethylene (PE) extrusion foamed three categories. [0003] However, the foamed polystyrene material has the disadvantages of polluting the environment during the molding process and the use process, while the foa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J9/18C08L23/12
Inventor 刘涛许志美赵玲曹贵平韩俊朱中南袁渭康
Owner EAST CHINA UNIV OF SCI & TECH