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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

Inactive Publication Date: 2019-03-29
WUHAN TEXTILE UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The existing literature only reports the preparation of graded lignin by chemical solvent separation to improve its oxidation resistance in polyolefins. The main disadvantage of this method is that the content of effective graded lignin prepared is too low, and the active ingredient is only about 6-20wt%

Method used

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Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

The invention relates to the technical field of antioxidants, in particular to a lignin based antioxidant for polyolefin, a preparation method and an application. The lignin based antioxidant is prepared from the following raw materials in parts by weight: 100 parts of industrial lignin, 50-200 parts of a modified monomer, 3-10 parts of an organic basic catalyst and 500 parts of a solvent, wherein the modified monomer is 3,5-di-tert-butyl-4-hydroxyphenylpropionyl chloride. The preparation method comprises the following steps: (1) stirring and mixing the industrial lignin and the solvent uniformly; (2) then, adding the modified monomer and the organic basic catalyst in sequence for a reaction for 12-72 h at 40-80 DEG C, precipitating the product with a precipitant, and performing suction filtration, washing and drying to obtain the lignin based antioxidant for polyolefin. The industrial lignin is from recycled pulping and papermaking waste liquor and the bioethanol industry, is low in price and renewable; the preparation method is simple, the cost is low, the prepared lignin based antioxidant has outstanding performance and is of great significance in promoting application and development of polyolefin and high value-added utilization of the industrial lignin.

Description

technical field [0001] The invention relates to the technical field of antioxidants, in particular to a lignin-based antioxidant for polyolefins, a preparation method and application. Background technique [0002] In order to improve the thermal oxidation resistance of polymer materials, antioxidants are added during thermal processing. At present, commercial antioxidants are mainly divided into phenolic and amine thermal oxidation stabilizers, and their consumption can be as high as 3 million tons per year. The above-mentioned commercial antioxidants are derived from the petroleum industry, the synthesis route is complex, and the cost is maintained at 40,000 yuan / ton, which is expensive. The price of industrial lignin is only 2,000-3,000 yuan / ton. If natural polyphenols such as lignin are used to partially replace the current phenolic antioxidants, it will not only greatly reduce the cost of materials, but also contribute to the sustainable utilization of resources. Waste...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/12C08L97/00C08L23/06C08H7/00
CPCC08H6/00C08L23/06C08L23/12C08L2201/08C08L2203/16C08L2207/066C08L97/005
Inventor 叶德展顾邵金周应山徐卫林尤仁传
Owner WUHAN TEXTILE UNIV
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