Process for preparing layered foamed polymeric materials
A technology for foaming polymers and polymer materials, applied in coatings, prostheses, medical science, etc., to achieve low-cost effects
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Embodiment 1
[0140] Example 1 - Invention
[0141] In this example, the polymer used was polystyrene (PS) (code N2380) supplied by Versalis SpA (Mantua, Italy) with an average molecular weight, density and melt flow index equal to 300 kDa, 1.05 g / cm, respectively 3 and 2.0 g / 10 min at 200°C and 10 kg.
[0142] The sample consisted of a PS cylindrical disk with a diameter of 25 mm and a thickness of 2.2 mm. Protect its side surface with metal barrier film (completely impermeable to blowing agent) ( Figure 2A Ω in ), the only surfaces exposed to contact with the blowing agent are the upper and lower substrates ( Figure 2A ∑ and ∑′ in ). In this way, mass transport occurs in the direction of the cylinder axis and can be studied as a one-dimensional problem. In this case and in those cases described in Examples 2, 3, 4, 5 and 6 in which the sample to be foamed is cylindrical, determined only by the need for a one-dimensional process leading to material transport, The use of barrier film...
Embodiment 2
[0159] Example 2 - Invention
[0160] A PS sample similar to the sample described in Example 1 with respect to the composition, geometry and orientation of the barrier film was placed in the reactor of the batch foaming apparatus shown in Figure 1 and described previously at room temperature. The reactor was then closed and allowed to reach a temperature of 100°C.
[0161] The system was then subjected to expansion CO using the pressure profile described in Table 2 2 Gas solubilization step.
[0162] Table 2
[0163] Initial pressure (bar) Final pressure (bar) Duration (minutes) step 1 0 130 0.2 step 2 130 130 120 step 3 130 80 9.6 step 4 80 130 15.6
[0164] As shown in Table 2, the pressure distribution consists of four stages:
[0165] In Step 1, expand CO over 0.2 minutes (12 seconds) with a linear ramp 2 Gas pressure from atmospheric pressure up to 130 bar;
[0166] · In step 2, the pressure was maintained at 130 b...
Embodiment 3-
[0178] Example 3 - Comparison
[0179] A PS sample similar to the sample described in Example 1 with respect to the composition, geometry and orientation of the barrier film was placed in the reactor of the batch foaming apparatus shown in Figure 1 and described previously at room temperature. The reactor was then closed and allowed to reach a temperature of 100°C.
[0180] The system was then subjected to expansion CO using the pressure profile described in Table 3 2 Gas solubilization step.
[0181] table 3
[0182] Initial pressure (bar) Final pressure (bar) Duration (minutes) step 1 0 100 0.2 step 2 100 100 180
[0183] As shown in Table 3, the pressure distribution consists of two steps:
[0184] In Step 1, expand CO over 0.2 minutes (12 seconds) with a linear ramp 2 Gas pressure from atmospheric pressure up to 100 bar;
[0185] · In step 2, CO will be expanded2 The gas pressure was kept at 100 bar for 180 minutes to allow complet...
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