Polylactic acid nanometer bubble hole foaming material and preparation method thereof
A foaming material and polylactic acid technology, applied in the field of biodegradable polymer foaming materials and their preparation, can solve the problems of uneven cells, low cell density, large cell size, etc. The effect of growth rate
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Embodiment 1
[0035] This embodiment provides a polylactic acid nanocellular foaming material, the raw materials of which are as follows:
[0036] Polylactic acid, 2003D, Natureworks, USA; L-lactic acid content greater than 98%, melt flow rate 6g / 10min, melt strength 100mN;
[0037]Chain extender master batch (containing 10% epoxy oligomer), Joncryl 4360, German BASF company;
[0038] Nucleating agent PPZn (phenyl zinc phosphate), self-made in the laboratory; nucleating agent diameter 0.1-10μm, melting point 250-350℃;
[0039] Carbon dioxide, purity>99%, commercially available;
[0040] The specific content is shown in Table 1.
[0041] Table 1
[0042] sample
Polylactic acid (parts)
PBAT (number of copies)
Nucleating agent (parts)
Chain extender (parts)
1
100
0
0
0
2
100
0
0
3
3
100
0
0.5
3
4
100
0
0.5
0
5
80
20
0.5
3
[0043] The polylactic acid nanocellular foam mat...
Embodiment 2
[0051] This embodiment provides a polylactic acid nanocellular foaming material, and its raw materials are as follows:
[0052] Polylactic acid, 2003D, Natureworks, USA; L-lactic acid content greater than 98%, melt flow rate 6g / 10min, melt strength 100mN;
[0053] Poly adipate / butylene terephthalate, C1200, German BASF company;
[0054] Carbon dioxide, purity>99%, commercially available;
[0055] The specific content is shown in Table 3.
[0056] table 3
[0057] sample
Polylactic acid (parts)
PBAT (number of copies)
1
90
10
2
80
20
3
70
30
[0058] Put the above components in a vacuum drying oven, dry at 60°C for more than 10 hours to remove moisture, and then mix polylactic acid, polyadipate / butylene terephthalate (PBAT) according to the component ratios in Table 3 The agent was melt-blended at 190°C for 15 minutes through an internal mixer, and the speed of the internal mixer was 60 rpm; then the blend material w...
Embodiment 3
[0065] This embodiment provides a polylactic acid nanocellular foaming material, and its raw materials are as follows:
[0066] Branched polylactic acid, synthesized in laboratory, molecular weight 220,831g / mol, melt flow rate 4.7g / 10min, melt strength 300mN;
[0067] Carbon dioxide, purity>99%, commercially available;
[0068] The branched polylactic acid was placed in a vacuum drying oven, dried at 60°C for more than 10 hours to remove moisture, and then hot-pressed at 190°C to form a 2mm-thick sheet for foaming, and the hot-pressing time was 10min.
[0069] In the second step, put the sample prepared in the previous step into the autoclave and inject supercritical CO 2 Carry out pressure foaming in the kettle, the soaking temperature in the kettle is 100°C, and the soaking pressure is 20MPa; after isothermal and pressure soaking for a certain period of time (as shown in Table 5), open the pressure relief valve to quickly release the pressure in the kettle to normal pressur...
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