Polymeric olefinic composition, lignin use and object
A technology of olefin polymers and compositions, applied in the direction of compositions, chemical instruments and methods for inhibiting chemical changes, etc., capable of solving problems such as low density, increased stiffness, and low wear resistance
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Embodiment 1
[0049] Example 1 - Comparative evaluation of general properties between PP and PE polymers and PP and PE composites comprising 30% lignin A (92.5% lignin, pH<7, Eucalyptus Kraft lignin).
[0050] See the table below where the changes in different properties are associated with the addition of 30% lignin to PP and PE, relative to the properties of the pure polymer.
[0051]
[0052] The addition of 30% lignin to PP and PE significantly increased the flow index (287% for PP and 103% for PE) when compared to the neat polymer, indicating greater processability of the composition. The addition of lignin also causes the induction of oxidation time (oxidative induction time –OIT ) and dimensional stability as evaluated by heat deflection temperature (HDT) are significantly improved.
[0053] With regard to mechanical properties, the addition of 30% lignin to PP and PE had no significant effect on hardness and tensile strength (measured at the outflow port), but caused (tensile a...
Embodiment 2
[0054] Example 2 - Comparative test of sequentially extruded PP and a compound according to the invention comprising 30% lignin A (92.5% lignin, pH<7, Eucalyptus Kraft lignin) in PP.
[0055] see Figure 1A , the change in the liquidity index; Figure 1B , carbonyl change; Figure 1C , stiffness change, GPa; Figure 1D , Tensile strength change, MPa.
[0056] It can be seen that the flow index (1A) fluctuates only throughout the successive extrusions, with no observed tendency for this property to increase or decrease with reprocessing.
[0057] No significant increase in the intensity of the carbonyl absorption band was also observed during extrusion (1B). The composition comprising lignin showed an increase in the strength of the tape in question after only 6 extrusion cycles. This increase in tape strength is known to be observed in degraded polyolefins. And the pure PP from the third extrusion cycle shows a clear trend of increasing carbonyl absorption band intensity....
Embodiment 3
[0060] Example 3 - Evaluation of properties of composites comprising between 10 and 40% lignin A (92.5% lignin, pH<7, Eucalyptus Kraft lignin) in PP and PE. The indicated values relate to the properties of the pure polymer.
[0061] see Figure 2A , the change in the liquidity index; Figure 2B , changes in thermal oxidation resistance; Figure 2C , the stiffness change (elastic modulus); Figure 2D , the change in tensile strength; Figure 2E , the fracture strength change; and Figure 2F , the bending strength changes.
[0062] The samples with different lignin contents followed the properties observed for the samples with 30% lignin: flow index, thermo-oxidation resistance, stiffness (tensile), breaking strength, flexural strength increase, and tensile measured at the outflow exit point Intensity retention (variation up to ±10%). With increasing lignin content, increases in flow index, stiffness (tensile) and breaking strength were observed for both PP and PE compo...
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