CN-121991473-A - Biomass composite reinforced PBAT multifunctional fully biodegradable plastic and preparation method thereof

Abstract

The invention provides a biomass composite reinforced PBAT multifunctional fully biodegradable plastic and a preparation method thereof, and relates to the technical field of materials. The invention discloses an industrial alkali lignin solution which is prepared by dispersing industrial alkali lignin in an ethyl acetate solvent, carrying out suction filtration on the industrial alkali lignin solution, concentrating and drying the obtained filtrate to obtain lignin, mixing PBAT resin, lignin and a compatibilizer, and carrying out hot press molding after mixing to obtain the biomass composite reinforced PBAT multifunctional biodegradable plastic.

Inventors

• ZHU DONGYU
• LIANG CHENXI
• MA ZHENCHUAN
• QIU XUEQING
• CHEN SHUSHENG
• QIU WENLIAN
• QI YI

Assignees

• 广东工业大学

Dates

Publication Date

20260508

Application Date

20260325

Claims (9)

1. 1. The preparation method of the biomass composite reinforced PBAT multifunctional fully biodegradable plastic is characterized by comprising the following steps of: (1) Preparation of lignin: Dispersing industrial alkali lignin in ethyl acetate solvent to obtain industrial alkali lignin solution, suction filtering the industrial alkali lignin solution, concentrating the filtrate, and drying to obtain lignin; (2) And (3) mixing the PBAT resin, the lignin prepared in the step (1) and the compatibilizer, and performing hot press molding after mixing to obtain the biomass composite reinforced PBAT multifunctional fully biodegradable plastic.
2. 2. The preparation method of the biomass composite reinforced PBAT multifunctional fully biodegradable plastic, as claimed in claim 1, is characterized in that the solid-to-liquid ratio of the industrial alkali lignin to the ethyl acetate solvent in the step (1) is 1 g:8-10 mL.
3. 3. The method for preparing the biomass composite reinforced PBAT multifunctional fully biodegradable plastic as claimed in claim 1, wherein the compatibilizer in the step (2) is lipoic acid.
4. 4. The preparation method of the biomass composite reinforced PBAT multifunctional fully biodegradable plastic, as claimed in claim 1, is characterized in that the mass ratio of lignin to PBAT resin in the step (2) is (1-3): 10.
5. 5. The method for preparing the biomass composite reinforced PBAT multifunctional fully biodegradable plastic according to claim 1, wherein the mass ratio of the compatibilizer to the PBAT resin in the step (2) is (0.1-0.5): 10.
6. 6. The preparation method of the biomass composite reinforced PBAT multifunctional biodegradable plastic, as claimed in claim 1, is characterized in that in the step (2), the mixing temperature is 135-150 ℃, the mixing time is 30-45 min, and the mixing rotating speed is 80-100 rpm.
7. 7. The method for preparing the biomass composite reinforced PBAT multifunctional biodegradable plastic according to claim 6, wherein in the step (2), the mixing temperature is 135 ℃, the mixing time is 30min, and the mixing rotating speed is 100 rpm.
8. 8. The method for preparing the biomass composite reinforced PBAT multifunctional biodegradable plastic according to claim 1, wherein the hot press molding is to spread the mixed material on a mold, hot melt 5min at 135 ℃, then press to 20 MPa for hot pressing 10min, cool and demould.
9. 9. The biomass composite reinforced PBAT multifunctional fully biodegradable plastic is characterized by being prepared by the method of any one of claims 1-8.

Description

Biomass composite reinforced PBAT multifunctional fully biodegradable plastic and preparation method thereof Technical Field The invention provides a biomass composite reinforced PBAT multifunctional fully biodegradable plastic and a preparation method thereof, and belongs to the technical field of materials. Background PBAT resin (polybutylene terephthalate-adipate) is widely favored in the market as a degradable plastic with excellent properties. PBAT resin can be decomposed into harmless substances such as carbon dioxide, water and a small amount of biomass by microorganisms, but PBAT resin is limited by factors such as high cost, poor weather resistance and water resistance. In order to improve the above performance defects of the PBAT resin, the PBAT resin is mainly filled with bio-based raw materials, wherein common bio-based raw materials include starch, cellulose, polylactic acid, lignin and the like. Lignin is a renewable biomass resource with abundant content in nature, and has wide sources, and the paper industry produces about 5000 ten thousand tons of lignin per year according to statistics, and most lignin is treated as waste, so that a great amount of resource waste is caused. The lignin has a unique three-dimensional reticular macromolecular structure, is rich in various functional groups such as phenolic hydroxyl groups, alcoholic hydroxyl groups, ether bonds, carbon-carbon double bonds and the like, and provides a large number of reaction sites for the chemical modification of the lignin, so that the lignin can be applied to composite materials through a physical or chemical method, the cost is reduced, the ultraviolet resistance, the antibacterial performance, the mechanical performance and the thermal stability of the material can be further improved, and the lignin has important significance for the high-value utilization of biomass materials. Patent CN116285245A discloses an ultraviolet aging resistant hydrolysis resistant PBAT material and a preparation method thereof, wherein lignin, rare earth complex, polybutylene adipate terephthalate and functional auxiliary agent are extruded, cooled and pelletized by a double screw extruder according to different proportions, and the ultraviolet aging resistant hydrolysis resistant PBAT material is obtained. The method has complex raw material composition, and a large amount of functional auxiliary agents including an antioxidant, a lubricant, an anti-hydrolysis agent and an ultraviolet absorber are used in the modification process. Patent CN106832801A discloses a preparation method of lignin modified PBAT biodegradable plastic, which comprises the steps of adding polybutylene terephthalate/adipic acid butanediol ester, lignin and functional additives into a high-speed mixer, fully mixing, extruding and granulating by a double-screw extrusion machine, and then blowing a film to obtain the lignin modified PBAT biodegradable plastic, so that the production cost is effectively reduced, but a plurality of functional additives are still used in the preparation process, the preparation process is complex, and the mechanical properties of the composite material cannot be obviously improved. Therefore, the preparation cost of the PBAT biodegradable plastic is further reduced, the mechanical property of the material is improved, and the multi-functionality is endowed with research hotspots in the field at present. Disclosure of Invention Based on the above, the invention provides a biomass composite reinforced PBAT multifunctional fully biodegradable plastic and a preparation method thereof. According to the invention, lignin and a compatibilizer are introduced into the PBAT resin, and the lignin modified bio-based PBAT degradable plastic is prepared through composite processing under the combined action, so that the lignin modified bio-based PBAT degradable plastic meets the requirement of complete degradation, simultaneously, the mechanical property of the PBAT material is greatly improved, and the ultraviolet aging resistance, the mechanical property and the photo-thermal property of the PBAT material are endowed. The invention is realized by adopting the following technical scheme: a preparation method of biomass composite reinforced PBAT multifunctional fully biodegradable plastic comprises the following steps: (1) Preparation of lignin: Dispersing industrial alkali lignin in ethyl acetate solvent to obtain industrial alkali lignin solution, suction filtering the industrial alkali lignin solution, concentrating the filtrate, and drying to obtain lignin; (2) And (3) mixing the PBAT resin, the lignin prepared in the step (1) and the compatibilizer, and performing hot press molding after mixing to obtain the biomass composite reinforced PBAT multifunctional fully biodegradable plastic. Preferably, in the step (1), the solid-to-liquid ratio of the industrial alkali lignin to the ethyl acetate solvent is 1 g:8-10 mL. Preferably, the compatibilizer is li