Preparation method of polymer foam material in open pore structure
A technology of foam material and open-cell structure, which is applied in the field of polymer foam material preparation, can solve the problems of large size, complicated experimental processing process, and difficult control of cell structure, etc., and achieves low cost, simple process, and is conducive to environmental protection Effect
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Embodiment 1
[0024] (1) According to the mass ratio of polymethyl methacrylate and polystyrene as 80:20, mix in a torque rheometer at normal pressure and 200 °C for 8 min to obtain a polymer blend;
[0025] (2) The polymer blend obtained in step (1) was subjected to vacuum molding, the molding temperature was 200 °C, the holding pressure was 10 MPa, and the holding time was 7 minutes to obtain a polymer with a thickness of 0.8 mm The flaky blend body is cooled and shaped;
[0026] (3) Place the sheet-like blend body of the polymer obtained in step (2) in a high-pressure reactor, and inject carbon dioxide into the reactor. The pressure in the reactor is controlled at 20 MPa, and the temperature is controlled at 90 °C. After the critical carbon dioxide reaches the saturated state in the green body, the pressure in the reactor is reduced to normal pressure at a pressure relief speed of about 15 MPa / s, and the polymer foam material is obtained after cooling and setting;
[0027] (4) Immerse t...
Embodiment 2
[0032] (1) According to the mass ratio of polymethyl methacrylate and polylactic acid as 80:20, mix in a torque rheometer at normal pressure and 180 °C for 8 min to obtain a polymer blend;
[0033] (2) The polymer blend obtained in step (1) was subjected to vacuum molding, the molding temperature was 180 °C, the holding pressure was 5 MPa, and the holding time was 5 min to obtain a polymer with a thickness of 0.8 mm The flaky blend body is cooled and shaped;
[0034] (3) Place the sheet-like blend body of the polymer obtained in step (2) in a high-pressure reactor, and inject carbon dioxide into the reactor. The pressure in the reactor is controlled at 20 MPa, and the temperature is controlled at 90 °C. After the critical carbon dioxide reaches a saturated state in the green body, the pressure in the reactor is reduced to normal pressure at a pressure relief speed of about 15 MPa / s, and the polymer foam material is obtained after cooling and setting;
[0035] (4) Immerse the ...
Embodiment 3
[0040] (1) According to the mass ratio of polymethyl methacrylate and polystyrene as 20:80, mix in a torque rheometer at normal pressure and 200 °C for 8 min to obtain a polymer blend;
[0041] (2) Same as step (2) of embodiment 1;
[0042] (3) Place the sheet-like blend body of the polymer obtained in step (2) in a high-pressure reactor, and inject carbon dioxide into the reactor. The pressure in the reactor is controlled at 20 MPa, and the temperature is controlled at 90 °C. After the critical carbon dioxide reaches a saturated state in the green body, the pressure in the reactor is reduced to normal pressure at a pressure relief speed of about 20 MPa / s, and the polymer foam material is obtained after cooling and setting;
[0043] (4) Immerse the polymer foam material obtained in step (3) in acetic acid for 3 hours to obtain a polymer foam material with an open cell structure;
[0044] (5) Same as Step (5) of Example 1.
[0045] The porosity of the product obtained in this e...
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