Molding and foaming process and device of macromolecule with supercritical rapid swelling through mold pressing

A supercritical fluid and polymer technology, applied in the field of polymer molding and foaming, can solve the problems of slow physical penetration process, low production efficiency, long foaming cycle, etc., to solve the problem of excessive swelling time, improve production efficiency, The effect of solubility increase

A supercritical fluid and polymer technology, applied in the field of polymer molding and foaming, can solve the problems of slow physical penetration process, low production efficiency, long foaming cycle, etc., to solve the problem of excessive swelling time, improve production efficiency, The effect of solubility increase

CN109955424APending Publication Date: 2019-07-02JIANGSU JICUI ADVANCED POLYMER MATERIAL RES INST CO LTD +1
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  • Molding and foaming process and device of macromolecule with supercritical rapid swelling through mold pressing
  • Molding and foaming process and device of macromolecule with supercritical rapid swelling through mold pressing
  • Molding and foaming process and device of macromolecule with supercritical rapid swelling through mold pressing

Examples

Experimental program
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Effect test

Embodiment 1

[0099] Taking the production of polypropylene foam material as an example, firstly, polypropylene and supercritical liquid carbon dioxide are mixed according to the mass ratio of 100:3, and heated to 200°C in the injection molding system. First fill the mold cavity with 20 MPa high-pressure carbon dioxide, and then inject the homogeneous solution in the injection molding system into the foaming mold. The raised lines 20 in the mold are strips parallel to each other, with a line depth of 0.5 mm. Adjacent lines The interval is 3mm, and the width of the pattern is 1mm. After the mold is filled with polymer, it is rapidly cooled to room temperature to form patterns on the surface of the polymer to increase the surface area. The average cooling rate is about 35-45°C / min. After the surface is cured, move the movable plate to the direction away from the mold cavity 9, so that the lines can contact with high-pressure carbon dioxide and continue to swell for 20 minutes, and then release...

Embodiment 2

[0101]Taking the production of polylactic acid foam material as an example, firstly, polylactic acid and supercritical liquid carbon dioxide are mixed according to the mass ratio of 100:3, and heated to 200°C in the injection molding system. First fill the mold cavity with 20 MPa high-pressure carbon dioxide, and then inject the homogeneous solution in the injection molding system into the foaming mold. The raised lines 20 in the mold are strips parallel to each other, with a line depth of 0.5 mm. Adjacent lines The interval is 3mm, and the width of the pattern is 1mm. After the mold is filled with polymer, it is rapidly cooled to room temperature to form patterns on the surface of the polymer to increase the surface area. The average cooling rate is about 35-45°C / min. After the surface is cured, move the movable plate to the direction away from the mold cavity 9, so that the lines can contact with high-pressure carbon dioxide and continue to swell for 20 minutes, and then rele...

Embodiment 3

[0103] Taking the production of polyethylene terephthalate foam material as an example, first mix polyethylene terephthalate and supercritical liquid carbon dioxide according to the mass ratio of 100:2, and heat it to 300 in the injection molding system. ℃. First fill the mold cavity with 20MPa high-pressure carbon dioxide, and then inject the homogeneous solution in the injection molding system into the foaming mold. The raised lines 20 in the mold are strips parallel to each other, with a line depth of 0.5mm, and the interval between adjacent lines 3mm, grain width 1mm, after the mold is filled with polymer, it is rapidly cooled to room temperature to form grains on the surface of the polymer to increase the surface area, and the average cooling rate is about 35-45°C / min. After the surface is cured, move the movable plate to the direction away from the mold cavity 9, so that the lines can contact with high-pressure carbon dioxide and continue to swell for 20 minutes, and the...

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Abstract

The invention provides a molding and foaming process of a macromolecule with supercritical rapid swelling through mold pressing. The problem of low production efficiency of supercritical foaming materials due to the long contact penetration time between polymers and gas during supercritical mold pressing foaming is solved. Supercritical fluid and a polymer melt can be mixed quickly and evenly through mechanical stirring of a screw in a charging cylinder of an injection molding machine, and after a homogeneous solution is injected from the injection molding machine to a mold cavity, through regulation of the temperature and further diffusion of the supercritical fluid, regulation of the melt strength before foaming and further increasing of the gas solubility can be achieved. A two-step grading method of melt blending and solid swelling foaming can ensure rapid diffusion and swelling of the supercritical fluid in a polymer matrix, the advantages of mold pressing foaming products are remained, meanwhile, the problem of the too long swelling time caused by gas diffusion in existing mold pressing foaming processes is solved, the production efficiency of mold pressing foaming is significantly improved, and industrialization of supercritical mold pressing foaming is further promoted.

Description

technical field [0001] The invention relates to a technology and device for forming and foaming polymers that are quickly swollen by molding supercritical fluids, and belongs to the technical field of supercritical polymer foaming. Background technique [0002] At present, the preparation of microcellular foamed materials by molding supercritical foaming has attracted extensive attention from new materials and related industries. This process has many advantages such as controllable foaming ratio, large cell density and small pore size, excellent mechanical properties, wide range of applicable materials, and environmental protection. However, the biggest bottleneck of this technology is the supercritical fluid in the polymer matrix. The diffusion process is slow, which leads to the formation of a relatively stable homogeneous solution between the gas and the polymer matrix after a long time of swelling, which makes the production cycle longer, that is, the production effic...

Claims

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Application Information

Patent Timeline
02 Jul 2019
Publication
CN109955424A
IPC
B29C44/42; B29C44/34; B29C44/58
CPC
B29C44/3415; B29C44/3442; B29C44/425; B29C44/428; B29C44/58
Inventors
龚鹏剑; 李光宪