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Preparation method of macromolecular plasticizer and preparation method of modified polylactic acid

A macromolecular plasticizer and plasticizer technology, applied in the field of polylactic acid, can solve the problems that modified polylactic acid cannot be widely used, the mechanical properties of polylactic acid are poor, and the plasticizer is unstable, so as to improve melt flow properties, improvement of blow molding processability, effect of inhibiting migration

Active Publication Date: 2017-02-22
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, traditional plasticizers are small molecules that easily migrate out of the polymer matrix, leaving voids in the polymer matrix, leading to further embrittlement of the material
Therefore, due to the shortcomings of plasticizer instability and easy precipitation, the mechanical properties of polylactic acid modified by plasticizer are poor, and modified polylactic acid is still not widely used.

Method used

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  • Preparation method of macromolecular plasticizer and preparation method of modified polylactic acid
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  • Preparation method of macromolecular plasticizer and preparation method of modified polylactic acid

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preparation example Construction

[0035] The embodiment of the present invention discloses a preparation method of a macromolecular plasticizer, comprising the following steps:

[0036] Mixing the coupling agent and the plasticizer to obtain the first reaction product after reaction;

[0037] The coupling agent is mixed with castor oil, and the second reaction product is obtained after the reaction;

[0038] Mixing the first reaction product with the second reaction product to obtain a macromolecular plasticizer after reaction;

[0039] The plasticizer is citrate triester and its derivatives or macromolecular polyol compound.

[0040] The application firstly provides a preparation method of a macromolecular plasticizer. The plasticizer prepared according to the method provided by the invention has the characteristics of hyperbranched macromolecules. It is used to modify polylactic acid, so that the processing performance of polylactic acid obtained is comparable to that of polylactic acid. The mechanical pro...

Embodiment 1

[0068]A) Put 0.1mol tributyl citrate (TBC) and 0.8mol hexamethylene diisocyanate (HDI) into a dry reaction flask, and stir the reaction at room temperature for a reaction time of 20 hours to ensure TBC The hydroxyl group can be fully replaced by the isocyanate in HDI;

[0069] B) Add 0.2 mol of HDI to 1.25 mol of dry and dewatered castor oil three-necked reaction flask, the system is protected by nitrogen, the reaction temperature is 60°C, and the reaction time is stirred for 10 hours;

[0070] C) The product of reaction step A) is slowly added dropwise to the product of reaction step B), the reaction temperature is 30 ° C, fully stirred, the reaction time is equivalent to the dropping time, and a hyperbranched macromolecular plasticizer prepolymer is obtained; Gel permeation chromatography (GPC) detects the plasticizer prepared in this embodiment, such as image 3 as shown, image 3 The GPC curve chart of the macromolecular plasticizer prepared for this example, the test re...

Embodiment 2

[0076] A) Put 0.2mol acetyl tributyl citrate (ATBC) and 1mol 4,4'-methylene diisocyanate phenyl (MDI) into a dry reaction flask, and stir the reaction at room temperature, The reaction time is 20 hours to ensure that the hydroxyl group of ATBC can be fully replaced by the isocyanate group in MDI;

[0077] B) 0.2 mol of MDI was added to 2.0 mol of dry and dehydrated castor oil three-neck reaction flask, the system was protected by nitrogen, the reaction temperature was 60°C, and the reaction time was stirred for 15 hours;

[0078] C) adding the product of the reaction step A) slowly to the product of the reaction step B), the reaction temperature is 30° C., fully stirred, and the reaction time is equivalent to the dropping time to obtain a hyperbranched macromolecular plasticizer prepolymer;

[0079] D) fully mixing the hyperbranched macromolecular plasticizer and polylactic acid, adding to a twin-screw extruder for melt extrusion and granulation to obtain a polylactic acid mas...

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Abstract

The invention provides a method for preparing a macromolecular plasticizer. The macromolecular plasticizer prepared by the method of the invention is a plasticizer with a hyperbranched macromolecular structure, which is stable and difficult to separate out. The present application also provides a preparation method of the modified polylactic acid, in which the macromolecular plasticizer is melt-mixed with the polylactic acid to realize the modification of the polylactic acid. Because the macromolecular plasticizer prepared by the present application has good compatibility with polylactic acid, the branched structure can increase the entanglement of polylactic acid molecular chains, improve melt strength, improve its melt flow characteristics, and improve polylactic acid. Blow molding processing performance; at the same time, the plasticizer is stable and not easy to precipitate, which can significantly improve the mechanical properties of polylactic acid.

Description

technical field [0001] The invention relates to the technical field of polylactic acid, in particular to a preparation method of a macromolecular plasticizer and a modified polylactic acid. Background technique [0002] Discarded plastic products, especially layered and film plastic products, are inevitable wastes in people's life and work, and the environmental pollution caused by them is becoming more and more serious. Therefore, the development and use of environmentally friendly and biodegradable plastics has become a worldwide hotspot. [0003] The plastic polylactic acid prepared from biomass resources is currently the plastic with the largest industrialization scale and the most cost-effective in the world. As an environmentally friendly plastic, polylactic acid has the biggest advantage of biodegradability, and polylactic acid has good processing performance and mechanical properties. However, due to the lack of branched chain structure, polylactic acid has low mel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/67C08G18/34C08G18/42C08L75/14C08L67/04
CPCC08G18/2815C08G18/4277C08G18/428C08G18/67C08G18/73C08G18/7671C08L67/04C08L75/14
Inventor 黄绍永陈学思李杲边新超
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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