Supercritical fluid foaming method for polypropylene material

A technology of supercritical fluid and polypropylene material, applied in the field of polymer foaming, can solve the problems of low foaming production efficiency and narrow foaming interval, and achieve the effects of shortening the saturation time, reducing the reject rate and widening the temperature interval.

Active Publication Date: 2019-11-26
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a supercritical fluid foaming method for polypropylene foam materials in order to overcome the defects of low foaming production efficiency and narrow foaming interval of polypropylene foam materials in the prior art

Method used

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  • Supercritical fluid foaming method for polypropylene material
  • Supercritical fluid foaming method for polypropylene material
  • Supercritical fluid foaming method for polypropylene material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] The homopolypropylene raw material (T m 155°C) is placed in the cavity 4, and the cavity 4 is heated by programmed temperature control at a heating rate of 10°C / min, heated to a foaming temperature of 147°C, and kept warm; open the ball valve 3, start the carbon dioxide injection pump 2, and control The injection pressure of carbon dioxide is 15 MPa, close the ball valve 3 and keep the pressure for 15 minutes; open the needle valve 5, slowly relieve the pressure of the cavity 4 to 10 MPa, the pressure relief rate is 0.03 MPa / s, close the needle valve 5; open the ball valve 3 and restart Inject supercritical carbon dioxide into the cavity 4 to 15MPa, close the ball valve 3, and keep the pressure for 15min; open the needle valve 5, slowly relieve the pressure of the cavity 4 to 10MPa, the pressure relief rate is 0.03MPa / s, and close the needle valve 5; Open the ball valve 3, re-inject supercritical carbon dioxide into the mold cavity 4 to 15 MPa, close the ball valve 3, and...

Embodiment 2

[0068] The ethylene propylene copolymer raw material (T m 155°C) is placed in the cavity 4, and the cavity 4 is heated by programmed temperature control at a heating rate of 10°C / min, heated to a foaming temperature of 147°C, and kept warm; open the ball valve 3, start the carbon dioxide injection pump 2, and control The carbon dioxide injection pressure is 15MPa, close the ball valve 3, and keep the pressure for 25min; open the needle valve 5, slowly relieve the pressure of the cavity 4 to 10MPa, the pressure relief rate is 0.03MPa / s, close the needle valve 5; open the ball valve 3, and restart Inject supercritical carbon dioxide into the mold cavity 4 to 15 MPa, close the ball valve 3, and maintain the pressure for 25 minutes; open the ball valve 6 and perform rapid pressure relief on the mold cavity 4 at a pressure relief rate of 400 MPa / s to obtain a polypropylene microcellular foam material.

Embodiment 3

[0070] The ethylene propylene butene copolymer raw material (T m 155°C) is placed in the cavity 4, and the cavity 4 is heated by programmed temperature control at a heating rate of 10°C / min, heated to a foaming temperature of 135°C, and kept warm; open the ball valve 3, start the carbon dioxide injection pump 2, and control The injection pressure of carbon dioxide is 15MPa, close the ball valve 3 and keep the pressure for 15min; open the needle valve 5, slowly relieve the pressure of the cavity 4 to 0MPa, and the pressure relief rate is 0.1MPa / s, close the needle valve 5; open the ball valve 3, and restart Inject supercritical carbon dioxide into the cavity 4 to 15MPa, close the ball valve 3 and keep the pressure for 15min; open the needle valve 5, slowly relieve the pressure of the cavity 4 to 0MPa, the pressure relief rate is 0.1MPa / s, and close the needle valve 5; Open the ball valve 3, re-inject supercritical carbon dioxide into the mold cavity 4 to 15 MPa, close the ball va...

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Abstract

The invention discloses a supercritical fluid foaming method for a polypropylene material. The method comprises the following steps: (1) heating the polypropylene material to a foaming temperature ina mold cavity; (2) injecting a supercritical fluid into the mold cavity, and keeping the supercritical state for at least 5 min; (3) slowly releasing pressure in the mold cavity to reduce the pressurein the mold cavity to 0-90% of original pressure; (4) re-injecting a supercritical fluid into the mold cavity, and keeping the supercritical state for at least 5 min; and (5) repeating the step (3) and the step (4) at least twice, and quickly releasing the pressure in the mold cavity. The supercritical fluid foaming method for the polypropylene material provided by the invention shortens the saturation time, improves the production efficiency, widens the foaming temperature interval, and reduces the product rejection rate.

Description

Technical field [0001] The invention relates to the field of polymer foaming, in particular to a supercritical fluid foaming method of polypropylene material. Background technique [0002] Polypropylene foam material is made of polypropylene as the matrix and contains a large number of polymer foam materials with uniformly distributed bubble structure. It has the characteristics of low density, high specific strength, good sound and heat insulation performance, and excellent cushioning performance. In recent years, polypropylene foam materials have been widely used in packaging and buffering, wire and cable, electronic appliances, transportation and other industries. [0003] Supercritical fluid foaming technology with supercritical CO 2 / N 2 Compared with traditional physical foaming agents (such as alkanes, freons, etc.), the physical foaming technology, which is a foaming agent, has the advantages of wide sources, environmental friendliness, and non-combustibility. In recent ye...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/12C08L23/12C08L23/08
CPCC08J9/122C08J2203/06C08J2203/08C08J2323/08C08J2323/12
Inventor 赵玲陈弋翀刘涛许志美奚桢浩宗原胡冬冬
Owner EAST CHINA UNIV OF SCI & TECH
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