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Degradable composite material and preparation method thereof

A composite material and a technology for degrading polyester, applied in the field of degradable composite materials and their preparation, can solve the problems of failing to improve the heat resistance of PLA, failing to improve the crystallization rate of PLA, etc., achieving a simple and efficient preparation method, shortening the production cycle, The effect of increasing matrix viscosity

Active Publication Date: 2020-04-14
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above inventions only considered the toughening of PLA, but failed to increase the crystallization rate of PLA, that is, they could not improve the heat resistance of PLA.

Method used

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  • Degradable composite material and preparation method thereof
  • Degradable composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033]First, 10 parts of PDLA (the number average molecular weight is 90,000, and the optical purity is 98.8%), 20 parts of PBAT (the number average molecular weight is 150,000) and 0.2 part of ADR4370 are added into the internal mixer and carried out melt blending for 5 minutes (blending temperature 200° C.) to obtain a PDLA / PBAT reactive blend (characterized, the reactive blend contains 3 parts of PDLA, 10 parts of PBAT, and 17 parts of PDLA-PBAT copolymer).

[0034] Then 70 parts of PLLA (the number average molecular weight is 130,000, and the optical purity is 99.0%), 30 parts of PDLA / PBAT reactive blend and tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl ) Propionic acid] pentaerythritol ester 0.3 parts into the internal mixer for melt blending for 4 minutes (blending temperature is 190 ℃); A degradable composite material can be obtained.

Embodiment 2

[0036] First, 12 parts of PDLA (the number average molecular weight is 120,000, and the optical purity is 97.5%), 20 parts of PCL (the number average molecular weight is 120,000) and 0.4 part of hexamethylene diisocyanate are added to the internal mixer for melt blending for 5 minutes (blending temperature is 205° C.) to obtain a PDLA / PCL reactive blend (characterized, the reactive blend contains 5 parts of PDLA, 9 parts of PCL, and 18 parts of PDLA-PCL copolymer).

[0037] Then 60 parts of PLLA (number average molecular weight is 150,000, optical purity is 98.2%), 40 parts of PDLA / PCL reactive blend, 0.2 part of three [2,4-di-tert-butylphenyl] phosphite and Add 0.2 parts of n-octadecyl alcohol ester of β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate into the internal mixer and carry out melt blending for 5 minutes (the blending temperature is 200°C); The blend is hot-pressed at a temperature of 210° C., and then annealed at 90° C. for 2 minutes to obtain a degradable composi...

Embodiment 3

[0039] First, 8 parts of PLLA (the number average molecular weight is 90,000, and the optical purity is 98.8%), 20 parts of PCL (the number average molecular weight is 100,000) and 0.3 part of diphenylmethane diisocyanate are added to the internal mixer for melt blending 6 minutes (blending temperature is 190° C.), to obtain a PLLA / PCL reactive blend (characterized, the reactive blend contains 4 parts of PLLA, 12 parts of PCL, and 12 parts of PLLA-PCL copolymer).

[0040] Then 72 parts of PDLA (number average molecular weight 120,000, optical purity 97.5%), 28 parts of PLLA / PCL reactive blend and N,N'-bis(2,6-diisopropylphenyl)carbon Add 0.3 parts of diimine into the internal mixer and carry out melt blending for 4 minutes (the blending temperature is 190°C); hot press the obtained blend at a temperature of 200°C, and then anneal at 110°C for 3 minutes to obtain a A degradable composite material.

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Abstract

The invention discloses a degradable composite material and a preparation method thereof, and belongs to the technical field of polymer processing and modification. The degradable composite material comprises the following components in parts by weight: 50-90 parts of polylactic acid A, 0.1-10 parts of polylactic acid B (the polylactic acid A and the polylactic acid B are optical isomers), 1-20 parts of a degradable polyester C, 1-50 parts of a polylactic acid B-degradable polyester C copolymer and 0.1-5 parts of a functional additive. The degradable composite material disclosed by the invention not only has excellent toughness, but also has excellent heat resistance, is completely biodegradable, and can be widely applied to the fields of plastic structural parts, plastic packages, automotive upholstery, medical consumables and the like.

Description

technical field [0001] The invention relates to a degradable composite material and a preparation method thereof, belonging to the technical field of polymer processing and modification. Background technique [0002] Due to the increasingly prominent problems of shortage of petroleum resources and serious environmental pollution, environmentally friendly materials are increasingly favored by people. Polylactic acid (PLA) is a bio-based and biodegradable material, and its synthetic raw materials are derived from plant resources such as corn, which are abundant and renewable. In addition, polylactic acid also has good biocompatibility, processability and mechanical strength, and is an ideal green polymer material. Polylactic acid (PLA) includes L-polylactic acid (PLLA), D-polylactic acid (PDLA) and racemic polylactic acid (PDLLA). PLLA and PDLA have opposite optical activity. When the two are blended, there will be structural complementarity between the molecular chains, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L67/02
CPCC08L67/04C08L2205/035C08L2205/025C08L2201/06C08L2201/08C08L67/02
Inventor 马丕明吴保钩钮德宇东为富杨伟军
Owner JIANGNAN UNIV
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