A kind of lignin-based antioxidant for polyolefin and its preparation method and application
An antioxidant and lignin-based technology, which is applied in the field of lignin-based antioxidants and preparation, can solve the problem of low content of lignin in effective classification, achieve the effect of improving thermal oxidation resistance, excellent performance, and promoting application development
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Embodiment 1
[0034] First, mix 1 part of kraft lignin and 99 parts of PP evenly, then melt and extrude the blended PP / kraft lignin on a micro extruder at 60 rpm at 180°C for 4 minutes to prepare a blended PP / kraft lignin extruded Discharge. Put it on the flat plate press at 180 o C and room temperature hot pressing and cold pressing for 10 min to prepare PP / 1wt% kraft lignin blend film;
[0035] Using the above preparation method and conditions, PP / 1wt% caustic soda lignin blend film and PP / 1wt% organic solvent lignin blend film were prepared;
[0036] After testing, the OIT of pure PP is 6.2 min; the OIT of PP / 1wt% kraft lignin blend film is 8 min; the OIT of PP / 1wt% caustic soda lignin blend film is 7.1 min; PP / 1wt% organic solvent The OIT of the lignin blend film was 9.2 min; the OIT of the 0.1wt% Irganox1010 / PP material was 17.2 min.
Embodiment 2
[0038] First, mix 1 part of kraft lignin with 1 part of LDPE uniformly, then melt and extrude the blended LDPE / kraft lignin on a micro extruder at 60 rpm at 160 ° C for 4 minutes to prepare a blended LDPE / kraft lignin extruded Discharging: The LDPE / kraft lignin extruded material was hot-pressed and cold-pressed at 180°C and room temperature for 10 min on a flat plate press, respectively, to prepare a LDPE / 1wt% kraft lignin blend film;
[0039] Using the above preparation method and conditions, LDPE / 1wt% caustic soda lignin blend film and LDPE / 1wt% organic solvent lignin blend film were prepared.
[0040] After testing, the OIT of pure LDPE is 9.4 min; the OIT of LDPE / 1wt% kraft lignin blend film is 11.1 min; the OIT of LDPE / 1wt% caustic soda lignin blend film is 10.0 min; LDPE / 1wt% organic solvent The OIT of the lignin blend film was 13.2 min; the OIT of the 0.1wt% Irganox1010 / LDPE material was 19.2 min.
Embodiment 3
[0042] Stir 100 parts of kraft lignin and 500 parts of tetrahydrofuran evenly, then add 50 parts of 3,5-di-tert-butyl-4-hydroxyphenylpropionyl chloride and 3 parts of pyridine to react at 70°C for 24 h Modified kraft lignin (HP-KL1) was prepared; 1 part of HP-KL1 and 99 parts of PP were mixed evenly, and melted and extruded on a micro extruder at 60 rpm at 180 °C for 4 minutes , to prepare the blended PP / HP-KL1 extrudate; the PP / HP-KL1 extrudate was hot-pressed and cold-pressed at 180°C and room temperature for 10 min on a flat plate press, respectively, to prepare PP / HP-KL1 co-extruded Mixed film;
[0043] Using the above preparation methods and conditions, modified caustic soda lignin (HP-AK1) and modified organic solvent lignin (HP-OL1) were prepared; correspondingly, PP / HP-AK1 blend films, PP / HP - OL1 blend film;
[0044] After testing, the OIT of PP / HP-KL1 blend film was 9.5 min, the OIT of PP / HP-AK1 blend film was 8.0 min, and the OIT of PP / HP-OL1 blend film was 10.6 m...
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