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
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[0098] Example 1
[0099] Taking the production of polypropylene foam material as an example, first, polypropylene and supercritical liquid carbon dioxide are mixed according to a mass ratio of 100:3, and heated to 200°C in an injection molding system. Fill the mold cavity with high-pressure carbon dioxide of 20 MPa, and then inject the homogeneous solution in the injection molding system into the molded foaming mold. The raised lines 20 in the mold are parallel strips with a depth of 0.5mm, adjacent lines The interval is 3mm, and the width of the pattern is 1mm. After the mold is filled with polymer, it is quickly cooled to room temperature to form a pattern 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 solidified, move the movable plate to the direction away from the cavity 9 so that the pattern can contact with high-pressure carbon dioxide and continue to swell for 20 minutes, and then the pressu...
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[0100] Example 2
[0101] Take the production of polylactic acid foam material as an example. First, polylactic acid and supercritical liquid carbon dioxide are mixed according to a mass ratio of 100:3, and heated to 200°C in an injection molding system. Fill the mold cavity with high-pressure carbon dioxide of 20 MPa, and then inject the homogeneous solution in the injection molding system into the molded foaming mold. The raised lines 20 in the mold are parallel strips with a depth of 0.5mm, adjacent lines The interval is 3mm, and the width of the pattern is 1mm. After the mold is filled with polymer, it is quickly cooled to room temperature to form a pattern 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 solidified, move the movable plate to the direction away from the cavity 9 so that the pattern can contact with high-pressure carbon dioxide and continue to swell for 20 minutes, and then the pres...
Example Embodiment
[0102] Example 3
[0103] Take the production of polyethylene terephthalate foam material as an example. First, the polyethylene terephthalate and supercritical liquid carbon dioxide are mixed according to a mass ratio of 100:2, and heated to 300 in the injection molding system. ℃. Fill the mold cavity with high-pressure carbon dioxide of 20MPa, and then inject the homogeneous solution in the injection molding system into the molded foaming mold. The raised patterns 20 in the mold are parallel strips with a depth of 0.5mm, and the adjacent patterns are separated 3mm, the width of the pattern is 1mm. After the mold is filled with polymer, it is quickly cooled to room temperature to form a pattern 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 solidified, move the movable plate to the direction away from the cavity 9 so that the pattern can contact with high-pressure carbon dioxide and continue to swe...
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