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Method for preparing microporous polysulfones foam material by injection molding of supercritical fluid

A technology of supercritical fluid and foaming material, which is applied in the field of supercritical fluid injection molding to prepare microporous polysulfone foaming materials, can solve the problems of high molding temperature, low solubility, unfavorable microcellular foaming, etc., and achieves high impact Strength, effect of high tensile strength

Inactive Publication Date: 2010-07-28
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] However, since polysulfone polymer is a relatively special polymer, it has the disadvantages of high molding temperature, low melt strength at high temperature, and low solubility of supercritical fluid in it, which is not conducive to microcellular foaming. Therefore, it is a topic of great concern to those skilled in the art whether the method of microcellular plastic injection molding with supercritical fluid can be used to prepare polysulfone microcellular foam materials.

Method used

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  • Method for preparing microporous polysulfones foam material by injection molding of supercritical fluid
  • Method for preparing microporous polysulfones foam material by injection molding of supercritical fluid
  • Method for preparing microporous polysulfones foam material by injection molding of supercritical fluid

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Experimental program
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Effect test

Embodiment 1

[0032] (1) Inject the supercritical fluid into the molten polysulfone melt in the homogenization section of the screw extruder to form a homogeneous solution.

[0033] (2) Extruding through the screw extruder, injecting the homogeneous melt into a temperature mold to obtain a microporous polysulfone foaming material.

[0034] The supercritical fluid is supercritical N 2 ; The temperature is 330°C and the pressure is 19MPa;

[0035] The polysulfone polymer is polysulfone;

[0036] The temperature of the mold is 100°C, the pressure difference between the mold and the screw extruder is 18.9MPa, and the injection rate when the homogeneous melt is injected into the mold is 40cm 3 / s;

[0037] Supercritical N 2 The weight ratio with polysulfone polymer is:

[0038] Supercritical N 2 : the polysulfone polymer=1:250; the residence time of supercritical fluid and polysulfone polymer in the screw extruder is 5s;

[0039] The method of ASTM is used for detection. Under this proces...

Embodiment 2

[0042] Adopt the same method as embodiment 1, wherein:

[0043] The supercritical fluid is supercritical N 2 ; The temperature is 380°C and the pressure is 24MPa;

[0044] The polysulfone polymer is polysulfone, the temperature of the mold is 140°C, the pressure difference between the mold and the screw extruder is 23.9MPa, and the injection rate when the homogeneous melt is injected into the mold is 60cm 3 / s;

[0045] Supercritical N 2 The weight ratio with polysulfone polymer is:

[0046] Supercritical N 2 : the polysulfone polymer=1:111;

[0047] The residence time of supercritical fluid and polysulfone polymer in the screw extruder is 10s;

[0048] The method of ASTM is used for testing. Under this processing condition, the obtained microcellular foamed polyethersulfone tensile sample loses 20% of the weight of the unfoamed entity, loses 19% of the tensile strength, and improves the specific tensile strength. 18.6%; the impact strength increased by 40%, and the spe...

Embodiment 3

[0050] Adopt the same method as embodiment 1, wherein:

[0051] The supercritical fluid is supercritical CO 2 ; The temperature is 330°C and the pressure is 19MPa;

[0052] The polysulfone polymer is polysulfone, the temperature of the mold is 100°C, the pressure difference between the mold and the screw extruder is 18.9MPa, and the injection rate when the homogeneous melt is injected into the mold is 40cm 3 / s;

[0053] Supercritical CO 2 The weight ratio with polysulfone polymer is:

[0054] Supercritical CO 2 : polysulfone polymer = 1:83;

[0055] The residence time of supercritical fluid and polysulfone polymer in the screw extruder is 5s;

[0056] The method of ASTM is used for detection. Under this processing condition, the obtained microcellular foamed polyethersulfone tensile sample is 10% lighter than the unfoamed entity, and the tensile strength is lost by 8.3%, and the specific tensile strength is increased. up 3.5%. The impact strength increased by 51%, and...

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Abstract

The invention provides a method for preparing a microporous polysulfones foam material by injection molding of a supercritical fluid. The steps of the method are as follows: (1) the supercritical fluid is injected into a polysulfones melt melted in a homogenization section of a screw extruder to form homogeneous-phase solution; (2) the homogeneous-phase solution is extruded by the screw extruder and then injected into a mould with the temperature of 100 to 140 DEG C, and then the microporous polysulfones foam material is produced. The supercritical fluid is supercritical N2 or CO2; and a polysulfones polymer includes but is not limited to polysulfone or polyether sulfone. The invention has the remarkable advantage that the method in the invention can prepare the microporous polysulfones foam material with light weight, high tensile strength, high impact strength and high bending strength.

Description

technical field [0001] This patent relates to a method for preparing microporous polysulfone foaming materials by supercritical fluid injection molding. Background technique [0002] Polysulfone polymer is a special engineering plastic with high temperature resistance, which has excellent comprehensive properties, such as heat resistance, oxidation resistance, hydrolysis resistance and flame retardancy, etc. It is widely used in electrical, electronic, mechanical, medical , chemical, food and aerospace fields. [0003] Microcellular foam refers to a cell diameter of 1 μm to 50 μm and a cell density of 10 9 ~10 12 cells / cm 3 foam plastic. [0004] Because the cells of microcellular foam are very small and the number is very large, on the one hand, it can maintain the advantages of general foam plastics: light weight, material saving, ability to absorb impact loads, good sound and heat insulation performance, and high specific strength and other common characteristics; On...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C44/20B29C44/42B29C44/60
Inventor 刘涛刘艳涛赵玲
Owner EAST CHINA UNIV OF SCI & TECH