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Reactive blending and toughening modified polylactic acid based composite material and preparation method thereof

A composite material, toughening modification technology, applied in the field of reactive blending toughening modified polylactic acid-based composite materials and their preparation, can solve the problem of limited toughness improvement effect, low interphase adhesion strength, loss of polylactic acid advantages and other problems, to achieve the effect of simple and easy preparation method, remarkable effect, novel and unique preparation method

Inactive Publication Date: 2015-12-30
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Shibata researchers (Polymer, 2006, 47:3557-3564) prepared blends of polylactic acid, PBS (polybutylene succinate) and PBSL by melt blending method, which effectively improved the polylactic acid. Toughness, but there is a problem of poor compatibility, and the adhesion strength of the phase interface is low, which makes the toughness improvement effect limited
The patent of Toray Corporation of Japan (CN101275011) adopts the method of blending E-MA-GMA elastomer and calcium carbonate to toughen polylactic acid, but only when the content of elastomer is high, the toughness is significantly improved, and polylactic acid is sacrificed. mechanical strength
Researcher Zhang in the United States (Ind.Eng.Chem.Res.2013,52:4787-4793) used EBA-GMA elastomer and zinc ionomer to toughen polylactic acid. When the processing temperature is 240°C, the impact strength is only Obvious improvement, but too high processing temperature will easily lead to degradation of polylactic acid, reducing other mechanical properties
In addition, most of the toughening modifiers currently used in modified polylactic acid are petrochemical resources, which undoubtedly loses the advantages of polylactic acid as a bio-based degradable material

Method used

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  • Reactive blending and toughening modified polylactic acid based composite material and preparation method thereof
  • Reactive blending and toughening modified polylactic acid based composite material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0023] (1) getting the raw materials ready: 40g of polylactic acid, molecular weight is the PCL10g of 1000g / mol, glycerine 1g (being 10% of PCL), MDI6.6g (the total hydroxyl functional group contained in its contained isocyanic acid functional group and PCL, glycerol The ratio of the amount of substances is 1:1).

[0024] (2) Preparation method: According to the above formula, polylactic acid, PCL and glycerin were added to the torque rheometer, melted and pre-blended for 10 minutes at a temperature of 190 ° C and a rotor speed of 60 rpm, then MDI was added, and again Melt blending at a temperature of 190°C and a rotor speed of 60 rpm for 10 minutes until the torque balance indicated that the reaction was complete, and then the material was taken out and cooled to room temperature to obtain a reactive blended toughened modified polylactic acid-based composite material. The blending temperature and rotational speed were kept constant throughout the experiment. The polylactic a...

Embodiment 2

[0027] (1) getting the raw materials ready: 40g of polylactic acid, molecular weight is the PCL10g of 2000g / mol, glycerine 1g (being 10% of PCL), MDI5.38g (the total hydroxyl functional group contained in its contained isocyanic acid functional group and PCL, glycerin The ratio of the amount of substances is 1:1).

[0028] (2) Preparation method: According to the above formula, polylactic acid, PCL and glycerin were added to the torque rheometer, melted and pre-blended for 10 minutes at a temperature of 190 ° C and a rotor speed of 60 rpm, then MDI was added, and again Melt blending at a temperature of 190°C and a rotor speed of 60 rpm for 10 minutes until the torque balance indicated that the reaction was complete, and then the material was taken out and cooled to room temperature to obtain a reactive blended toughened modified polylactic acid-based composite material. The blending temperature and rotational speed were kept constant throughout the experiment. The polylactic ...

Embodiment 3

[0031] (1) raw materials: polylactic acid 40g, molecular weight is the PCL10g of 1000g / mol, glycerin 0.30g (being 3% of PCL), MDI3.73g (it contains isocyanic acid functional group and PCL, glycerin and contains total hydroxyl functional group The ratio of the amount of substance is 1:1).

[0032] (2) Preparation method: According to the above formula, polylactic acid, PCL and glycerin were added to the torque rheometer, melted and pre-blended for 10 minutes at a temperature of 190 ° C and a rotor speed of 60 rpm, then MDI was added, and again Melt blending at a temperature of 190°C and a rotor speed of 60 rpm for 10 minutes until the torque balance indicated that the reaction was complete, and then the material was taken out and cooled to room temperature to obtain a reactive blended toughened modified polylactic acid-based composite material. The blending temperature and rotational speed were kept constant throughout the experiment. The polylactic acid-based composite material...

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Abstract

The invention provides a reactive blending and toughening modified polylactic acid based composite material and a preparation method thereof. The composite material comprises raw materials including 70-90 parts by weight of polylactic acid, 10-30 parts by weight of a toughening agent soft segment, a cross-linking agent and a toughening agent hard segment, wherein the dosage of the cross-linking agent accounts for 1%-15% of the weight of the toughening agent soft segment; the dosage of the toughening agent hard segment is determined according to an amount ratio of contained isocyanic acid functional groups to total hydroxyl substances contained in the toughening agent soft segment and the cross-linking agent being (1.0-1.05):1. The high-toughness polylactic acid based composite material can still keep the degradable feature of polylactic acid, further, the preparation method is simple and easy, and the property of polylactic acid can be regulated and controlled by changing the molecular weight, the content and the degree of crosslinking of the toughening agent soft segment.

Description

(1) Technical field [0001] The invention belongs to the technical field of toughening modification of polylactic acid, in particular to a reactive blending toughening modified polylactic acid-based composite material and a preparation method thereof. (2) Background technology [0002] At present, with the rapid development of industrial technology, the demand for various non-degradable polymers dependent on petroleum resources continues to increase, resulting in increasing consumption of petroleum resources and increasing global white pollution problems. Sustainable development poses enormous challenges. In order to reduce the dependence on non-renewable resources such as petroleum, it is a practical and effective way to develop environmentally friendly new materials to replace traditional petroleum-based polymers. Based on this, bio-based polymer materials have attracted more and more attention. Polylactic acid (PLLA) is a biodegradable polymer material derived from renew...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L75/06C08L75/08C08G18/76C08G18/73C08G18/66C08G18/42C08G18/48C08G18/32
Inventor 马猛王旭郑海明陈思施燕琴吴波震
Owner ZHEJIANG UNIV OF TECH
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