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A polylactic acid/tianjia rubber composite material with balanced rigidity and toughness and its preparation method

A technology of composite materials and polylactic acid, which is applied in the field of polylactic acid/tianjia rubber composite materials and its preparation, can solve the problems of large decrease in tensile strength, low elastic modulus, low impact strength, etc., and achieve interfacial compatibility Improvement, excellent impact strength, and excellent interfacial compatibility

Active Publication Date: 2019-11-15
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This invention mainly introduces the shape memory function, and mentions less about mechanics. The tensile strength of Example 1 and Example 4 at low rubber content is higher, but the impact strength is lower, respectively 6.88 and 11.78kJ / m 2
Increase the rubber content, the impact strength in Example 2 is greatly improved, but due to the lower elastic modulus of ENR itself, the tensile strength decreases greatly, only 26.5Mpa

Method used

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  • A polylactic acid/tianjia rubber composite material with balanced rigidity and toughness and its preparation method
  • A polylactic acid/tianjia rubber composite material with balanced rigidity and toughness and its preparation method
  • A polylactic acid/tianjia rubber composite material with balanced rigidity and toughness and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The raw materials are polylactic acid as the matrix resin, racemic polylactic acid (PDLLA, Zhejiang Hisun Biomaterials Co., Ltd.), MG20 (Tianjia rubber with a grafting rate of methyl methacrylate of 20%), and trefoil rubber.

[0037] First, MG20 and clover rubber were masticated on an open mill. Next, polylactic acid (80g) and antioxidant 1076 (1.0g) were added to a torque rheometer at a temperature of 170°C and a rotor speed of 60r / min. After PLA was plasticized, MG20 (5g) and clover Rubber (15g), lithium acetylacetonate (0.4g), after mixing for 3 minutes, add tert-butyl peroxybenzoate (0.3g) 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 hom...

Embodiment 2

[0039] The raw materials are polylactic acid as the matrix resin, racemic polylactic acid (PDLLA, Zhejiang Hisun Biomaterials Co., Ltd.), MG20, and trefoil rubber.

[0040] First, MG20 and clover rubber were masticated on an open mill. Next, add polylactic acid (80g) and antioxidant 168 (1.0g) to a torque rheometer with a temperature of 170°C and a rotor speed of 60r / min. After PLA is plasticized, add MG20 (10g) and clover Rubber (10g) and sodium acetylacetonate (0.4g) were mixed for 3 minutes, then added with benzoyl peroxide (0.3g) for dynamic vulcanization, and discharged 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 ...

Embodiment 3

[0042] The raw material is polylactic acid as the matrix resin, racemic polylactic acid (PDLLA, Zhejiang Hisun Biomaterials Co., Ltd.), MG20.

[0043] First, MG20 was masticated on an open mill. Next, polylactic acid (80g) and antioxidant 1010 (1.0g) were added to a torque rheometer with a temperature of 170°C and a rotor speed of 60r / min. After 3PLA was plasticized, MG20 (20g) and potassium acetylacetonate were added. (0.4g), after mixing for 3min, add 2,4-dichlorobenzoyl peroxide (0.3g) for dynamic vulcanization, and discharge after 5min. 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.

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Abstract

The invention discloses a PLA (Polylactic acid) / NR-PMMA (natural rubber-poly(methyl methacrylate)) rubber composite material with balanced rigidity and flexibility and a preparation method of the PLA / NR-PMMA rubber composite material. The composite material is prepared from the following raw materials in parts by mass: 20-90 parts of PLA, 5-80 parts of NR-PMMA rubber, 0-30 parts of NR, 0.1-2 partsof an antioxidant, 0.1-3 parts of a cross-linking agent and 0.1-3 parts of an ester exchange catalyst. During preparation, PLA, the antioxidant and the rubber are evenly mixed at 150-200 DEG C, and the ester exchange catalyst is added, so that PLA and NR-PMMA are subjected to melting transesterification at the interface; then, the cross-linking agent is added for dynamic vulcanization of the rubber under the action of high-speed shearing. The composite material has a bicontinuous phase microstructure and excellent interface compatibility, can achieve high flexibility at a lower rubber contentwhile maintaining higher tensile strength, has the characteristic of rigidity and flexibility balance, and can be widely applied to the fields of medical treatment, electronic information, food packaging, new energy sources, environmental protection and the like.

Description

technical field [0001] The invention relates to a composite material, in particular to a dynamically vulcanized polylactic acid / Team rubber composite material with balanced rigidity and toughness and a preparation method thereof. Background technique [0002] With the increasing awareness of environmental protection and the increasingly prominent oil resource crisis, the application of traditional petroleum-based polymers has been seriously affected. These traditional petroleum-based polymer materials are difficult to degrade, which is very harmful to the environment and even directly affects human health. Therefore, the development and application of biocompatible, biodegradable, green and environmentally friendly bio-based polymer materials, especially those from renewable resources, has attracted widespread attention from all walks of life. [0003] Polylactic acid (PLA) is currently one of the most potential bio-based polymers. It is derived from renewable resources suc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/04C08L51/04C08L7/00C08K5/14
CPCC08K5/14C08L67/04C08L2205/03C08L2205/22C08L2312/00C08L51/04C08L7/00
Inventor 陈玉坤王文涛刘雨桐袁道升
Owner SOUTH CHINA UNIV OF TECH
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