Compositions for improving polyesters
A technology of polyester and polyepoxide, which is used in the field of improving polyester compositions, and can solve problems such as difficult control of long-chain branching
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[0041] PMDA (pyrellitic anhydride), PBO (1,3-phenylene-bis- A combination of oxazoline) and sterically hindered phenols (ie, compounds containing 4-hydroxy-3,5-di-tert-butyl-phenyl moieties) can be used to improve the properties of PET. Discusses chain transfer that considers sterically hindered phenols as hydrogen donors, where free radical scavengers neutralize alcoxy or peroxyl groups generated by hydrolysis or thermal degradation, and indeed thus terminate the degradation process. It is also discussed that by adding sterically hindered phenols, the availability of the anhydride functionality thus remains intact for further modification reactions.
[0042] The inventors have surprisingly found that the addition of a polyfunctional compound comprising at least two non-sterically hindered phenolic hydroxyl groups instead of a sterically hindered phenol as taught in EP2 163 577A1 further improves PET. In addition, the inventors also found that the non-sterically hindered phen...
Embodiment 1
[0148] To evaluate the ability of various formulations to improve the properties of PET, PET (polyester 1101 supplied by Invista) was added at the inlet of a Brabender Plasticorder at 250°C and mixed at a speed of 50 rpm. After melting the polymer (approximately 2 to 3 minutes after addition), the formulations to be tested (Formulations 1 and 2, according to Tables 1 and 2 below) were added to the melt, after 2 to 3 minutes of addition, the mixing and heating was stopped and the The melt was removed from the Brabender and allowed to cool to room temperature.
[0149] Melt rheology of solid materials was tested using TA instrument Ares G2 for plate-plate rheology (respectively: frequency sweep: isothermal 270dC, 0.1 rad / s to 1000 rad / s, and strain 1%, and Strain sweep: isothermal 270dC, 1 rad / s, strain 0.1% to 250%). The results are given in Table 3 below.
[0150] Table 1 - Recipe 1
[0151]
[0152] Table 2 - Recipe 2
[0153]
[0154] PET = polyethylene terephthala...
Embodiment 2
[0161] In order to verify the ability to increase the melt strength of PET, formulations as described herein were compared with formulations known in the art (for example according to EP2 163 577).
[0162]PET and additives (see Tables 5 to 7 below) were compounded on a Brabender KETSE20 / 40D EC co-rotating, intermeshing twin-screw extruder with vacuum vented barrel. The diameter of the screw is D=20mm, and the length of the screw is L=40D. A standard screw configuration with conveying screw elements, kneading screw elements and mixing screw elements was used. The extruder was operated at a polymer feed rate of 1740 g / h 75 rpm, the temperature profile in the extruder is shown in Table 4.
[0163] Table 4 - Temperature profile in the extruder
[0164]
[0165] The polymer and masterbatch additives (i.e., PDMA in polyethylene (PE)) were fed using a volumetric feeder at the main feed, and a volumetric sub-feeder (which was located on the main feed Downstream at 12D) other ad...
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