Bio-based thermoplastic elastomer with shape memory function and preparation method thereof

A thermoplastic elastomer, bio-based technology, applied in the field of thermoplastic elastomers, can solve the problems of insufficient fixation rate of polylactic acid-based polymer products, decreased shape memory performance, low shape recovery rate, etc. Compatibility, the effect that is conducive to effective delivery

Active Publication Date: 2015-11-11
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is that the polylactic acid polymer has insufficient fixation rate, slow shape recovery, low shape recovery rate, poor toughness, and serious decline in shape memory performance after repeated use. It provides a thermoplastic elastomer with a shape The fixing rate reaches 100%, and the shape recovery rate reaches over 97%. After 3 stretching cycles, the sample's shape fixing rate still reaches 100%, and the shape recovery rate reaches over 95%. After 5 stretching cycles, the test The shape fixation rate of the sample still reaches 100%, the shape recovery rate reaches more than 90%, and the bio-based thermoplastic elastomer with shape memory function can quickly return to the original shape within 1 minute and its preparation method

Method used

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  • Bio-based thermoplastic elastomer with shape memory function and preparation method thereof
  • Bio-based thermoplastic elastomer with shape memory function and preparation method thereof
  • Bio-based thermoplastic elastomer with shape memory function and preparation method thereof

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Effect test

Embodiment 1

[0028] Polylactic acid was selected as the matrix resin, specifically racemic polylactic acid (PDLLA, Zhejiang Hisun Biomaterials Co., Ltd.). The ENR‐10 was first masticated on an open mill. Next, polylactic acid (80g) and antioxidant 168 (0.2g) were added to a torque rheometer at a temperature of 150°C and a rotor speed of 60r / min, and ENR‐10 (20g) was added after 3 minutes, trifluorinated Boron ether (0.5g), after mixing for 3 minutes, add tert-butyl peroxybenzoate (0.1g) for dynamic vulcanization, and discharge after 5 minutes. The samples were crushed into fine and uniform particles with a crusher, and then injection molded into standard splines with a single-screw injection molding machine. The injection temperature of the single-screw injection molding machine is: 165°C in the feeding section, 170°C in the compression section, 170°C in the homogenization section, 175°C in the head and die part, and the screw speed is 90r / min.

Embodiment 2

[0030] Polylactic acid was selected as the matrix resin, racemic polylactic acid (PDLLA, Zhejiang Hisun Biomaterials Co., Ltd.), ENR‐30. The ENR‐30 was first masticated on an open mill. Next, polylactic acid (60g) and antioxidant 1010 (0.8g) were added to a torque rheometer at a temperature of 170°C and a rotor speed of 60r / min, and ENR‐30 (40g) was added after 3 minutes, trifluoride Boron ether (0.4g), after mixing for 3 minutes, add 2,4-dichlorobenzoyl peroxide (1.0g) for dynamic vulcanization, and discharge after 5 minutes. The samples were crushed into fine and uniform particles with a crusher, and then injection molded into standard splines with a single-screw injection molding machine. The injection temperature of the single-screw injection molding machine is: 165°C in the feeding section, 170°C in the compression section, 170°C in the homogenization section, 175°C in the head and die part, and the screw speed is 90r / min.

Embodiment 3

[0032] Polylactic acid was selected as the matrix resin, Zhejiang Hisun Biomaterials Co., Ltd., racemic polylactic acid (PDLLA), ENR-30. The ENR‐30 was first masticated on an open mill. Add polylactic acid (30g) and antioxidant B102 (1.8g) to a torque rheometer at a temperature of 150°C and a rotor speed of 60r / min. After 3 minutes, add ENR‐30 (70g) and boron trifluoride Ethyl ether (1.0g), after mixing for 3 minutes, add di‐(tert-butylperoxyisopropyl)benzene (1.8g) for dynamic vulcanization, and discharge after 5 minutes. Use a crusher to break the sample into fine and uniform particles. The obtained blend is heated and pressurized on a flat vulcanizer. The heating temperature is 160°C, and the applied pressure is: 25MPa. After 10 minutes of hot pressing and cold pressing for 4 minutes, the obtained Film with a thickness of 1 mm.

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Abstract

The invention relates to a bio-based thermoplastic elastomer with shape memory function and a preparation method thereof. The bio-based thermoplastic elastomer with shape memory function is prepared from the following raw materials in parts by mass: 30-80 parts of polylactic acid, 20-70 parts of epoxidized natural rubber, 0.2-2 parts of antioxidant, 0.02-2 parts of boron trifluoride etherate and 0.1-3 parts of crosslinking agent. The preparation method comprises the following steps: uniformly mixing the polylactic acid, antioxidant, boron trifluoride etherate and epoxidized natural rubber at 150-190 DEG C, and adding the crosslinking agent under high-speed shearing actions to vulcanize the rubber in situ, thereby obtaining the bio-based thermoplastic elastomer with shape memory function. The rubber phase and plastic phase of the bio-based thermoplastic elastomer respectively appear a continuous phase structure. The structure endows the material with excellent shape memory function and mechanical properties, so that the shape fixation rate is up to 100%, and the shape recovery rate is up to 90% or above.

Description

technical field [0001] The invention relates to a thermoplastic elastomer, in particular to a bio-based thermoplastic elastomer with shape memory function and a preparation method thereof. Using PLA and ENR as basic raw materials, the material with shape memory function is prepared through dynamic vulcanization. Background technique [0002] Since the 1960s, shape memory materials have attracted worldwide attention due to their unique properties. Shape memory refers to the phenomenon that a product with an initial shape can be restored to its original shape after being deformed and fixed by means of external stimulus such as heating. So far, the shape memory materials that people have discovered mainly include shape memory alloys, shape memory ceramics, and shape memory polymers. Among them, shape memory polymers have been paid attention to because of their superior properties such as light weight, large deformation, low induction temperature, easy processing and low price...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L15/00C08K5/14C08K5/55
Inventor 陈玉坤陈昆玲汪友红徐传辉
Owner SOUTH CHINA UNIV OF TECH
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