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A kind of lignin-reinforced bio-based shape-memory thermoplastic elastomer and its preparation method and application

A thermoplastic elastomer and bio-based technology, applied in the field of thermoplastic elastomers, can solve the problems of insufficient rigidity, sacrifice PLA degradability, and decrease in mechanical strength, and achieve good shape memory performance, improved shape recovery ability, and broad application prospects Effect

Active Publication Date: 2022-06-24
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The invention adopts a peroxide vulcanization system, and NBR forms a covalent cross-linked network, sacrificing the degradability of PLA; and when the NBR content is high, the mechanical strength decreases significantly, and the rigidity is insufficient

Method used

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  • A kind of lignin-reinforced bio-based shape-memory thermoplastic elastomer and its preparation method and application
  • A kind of lignin-reinforced bio-based shape-memory thermoplastic elastomer and its preparation method and application
  • A kind of lignin-reinforced bio-based shape-memory thermoplastic elastomer and its preparation method and application

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preparation example Construction

[0036] The present invention also provides the preparation method of the bio-based shape memory thermoplastic elastomer described in the above technical solution, comprising the following steps:

[0037] Mixing the nitrile-containing rubber, metal salt and lignin to obtain a masterbatch;

[0038] Mixing polylactic acid and antioxidant, plasticizing to obtain a mixture;

[0039] The masterbatch and the mixture are mixed for dynamic cross-linking to obtain a bio-based shape memory thermoplastic elastomer reinforced with lignin.

[0040] In the present invention, the nitrile-based rubber, metal salt and lignin are kneaded to obtain a master batch. In the present invention, the temperature of the kneading is preferably 30 to 60°C, more preferably 40 to 50°C; the time of the kneading is preferably 8 to 15 minutes, more preferably 10 to 13 minutes. The present invention firstly kneads the nitrile-containing rubber, metal salt and lignin, so that the lignin and the metal salt can b...

Embodiment 1

[0047] Mixing nitrile butadiene rubber (NBR), zinc chloride and lignin at 40°C for 10min to obtain a masterbatch;

[0048] The polylactic acid was dried at 70°C for 24 hours to obtain the dried polylactic acid;

[0049] An internal mixer was used, the rotation speed was set to 80 r / min, the dried polylactic acid and antioxidant 1010 were added to the internal mixer, and the mixture was uniformly plasticized at 200° C. to obtain a mixture;

[0050] The masterbatch was added to the mixture, the rotational speed in the internal mixer was set to 80 r / min, and dynamic cross-linking was carried out at 190 ° C for 10 min to obtain a bio-based shape memory thermoplastic elasticity reinforced by lignin. body;

[0051] In the present embodiment, the polylactic acid adopted is the REVODE 101 type PLA (poly-L-lactic acid) produced by Zhejiang Hisun Biomaterials Co., Ltd.; the nitrile rubber adopted is the 1043N type produced by Taiwan Nandi Chemical Industry Co., Ltd. NBR;

[0052] The...

Embodiment 2

[0057] Mixing nitrile butadiene rubber (NBR), zinc sulfate and lignin at 50°C for 10min to obtain a masterbatch;

[0058] The polylactic acid was dried at 70°C for 12 hours to obtain the dried polylactic acid;

[0059] An internal mixer was used, the rotation speed was set to 60 r / min, the dried polylactic acid and antioxidant 168 were added to the internal mixer, and the mixture was uniformly plasticized at 200 ° C to obtain a mixture;

[0060] The masterbatch is added to the mixture, the rotating speed in the internal mixer is set to 60 r / min, and dynamic crosslinking is carried out at 200 ° C for 10 min to obtain a bio-based shape memory thermoplastic elasticity reinforced by lignin. body;

[0061] In the present embodiment, the polylactic acid used is REVODE 101 type PLA produced by Zhejiang Hisun Biomaterials Co., Ltd.; the nitrile rubber used is 1043N type NBR produced by Taiwan Nandi Chemical Industry Co., Ltd.;

[0062] The parts by weight of each raw material are as...

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Abstract

The invention provides a lignin-reinforced bio-based shape-memory thermoplastic elastomer, a preparation method and application thereof, and relates to the technical field of thermoplastic elastomers. The bio-based shape memory thermoplastic elastomer provided by the present invention comprises the following preparation raw materials in parts by weight: 50-90 parts of nitrile-based rubber; 10-50 parts of polylactic acid; 0.2-1 part of antioxidant; 3 parts of metal salt ~10 parts; 10~50 parts of lignin. The bio-based shape-memory thermoplastic elastomer provided by the present invention has a reversible crosslinking structure based on coordination bonds and a bicontinuous microscopic phase structure; it not only has good impact resistance, high mechanical strength, and can be repeatedly processed, but also has excellent shape memory performance , The shape recovery can be realized within 30s, the shape fixation rate can reach more than 94%, and the shape recovery rate can reach more than 97%, and it can be realized repeatedly.

Description

technical field [0001] The invention relates to the technical field of thermoplastic elastomers, in particular to a bio-based shape memory thermoplastic elastomer reinforced with lignin and a preparation method and application thereof. Background technique [0002] Traditional polymer materials are mostly derived from petroleum. Due to the increasing shortage of petroleum resources and non-renewable resources, and in response to the call for vigorously developing renewable resources and protecting the environment, it is urgent to find new renewable polymers that can replace petroleum-based polymer materials. Task. Polylactic acid (PLA) is obtained by ring-opening polymerization of lactide or by dehydration condensation of L-lactic acid / D-lactic acid, or by heating and polymerization of L-lactic acid / D-lactic acid in organic solvent. , renewable characteristics, or a good bio-based material, is a perfect substitute for petroleum-based polymer materials. PLA also has the adv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/04C08L9/02C08L9/00C08L97/00C08K3/16C08K3/30
CPCC08L67/04C08L9/02C08L9/00C08L2207/04C08L2205/03C08L2201/12C08K2003/168C08K2003/3045C08L97/005C08K3/16C08K3/30
Inventor 裴先强王彦张展程王廷梅王齐华
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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