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Polylactide-type polyurethane-modified polylactic acid alloy and preparation method thereof

A polyurethane modification and polylactide technology, applied in the field of polymer materials, can solve problems such as toughness decline, and achieve the effects of easy control, excellent heat resistance and good toughness

Active Publication Date: 2017-01-04
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The polylactic acid compound preferentially forms stereocomplex crystals under various heat treatment conditions, and the rapid crystallization has a higher thermal deformation temperature. However, the toughness of the polylactic acid complex will be significantly lower than that of pure L-polylactic acid.
[0006] In view of the dual problems faced by polylactic acid heat-resistant modification and toughening, in the preparation of many thermoplastic elastomer toughened polylactic acid alloy materials, polyurethane is considered an ideal by most researchers because of its relatively large structure controllability. The toughening agent is used in the study of toughening modification of polylactic acid, but whether it can further modify the toughening and heat resistance of polylactic acid through further structural regulation, there are few reports in the literature and patents

Method used

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  • Polylactide-type polyurethane-modified polylactic acid alloy and preparation method thereof
  • Polylactide-type polyurethane-modified polylactic acid alloy and preparation method thereof
  • Polylactide-type polyurethane-modified polylactic acid alloy and preparation method thereof

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preparation example Construction

[0024] The present invention provides a preparation method of polylactide polyurethane modified polylactic acid alloy, which comprises the following steps:

[0025] a Dissolve D-polylactide polyol, diisocyanate and catalyst in a solvent and react at 50℃~100℃ under the protection of protective gas to obtain prepolymer. Among them, D-polylactide polyol , The molar ratio of diisocyanate to catalyst is 1:3~5:0.001~0.01;

[0026] b. Add a chain extender to the prepolymer to carry out a chain extension reaction to obtain a D-polylactide polyol polyurethane elastomer, wherein the molar ratio of the chain extender to the D-polylactide polyol is 2 to 4 :1;

[0027] c 60 parts by mass to 99.5 parts by mass of polylactic acid and 0.5 parts by mass to 40 parts by mass of D-polylactide polyol polyurethane elastomer are pre-mixed, and then melted and extruded at 175°C to 190°C through a twin screw to obtain polypropylene Lactide polyurethane modified polylactic acid alloy.

[0028] In step a, the...

Embodiment 1

[0043] After mixing D type-polylactide polyol (number average molecular weight 500, hydroxyl value 238mg KOH / g), isophorone diisocyanate (IPDI), dibutyl tin dilaurate at a molar ratio of 1:3:2:0.005 , Added to the reactor, reacted at 75° C. for 3 hours, adding anhydrous acetone (50% of the total mass of the material) was added to adjust the viscosity to obtain a prepolymer.

[0044] 1,4-Butanediol (DBO) was added to the prepolymer to carry out the chain extension reaction. After the reaction, the acetone was removed by vacuum drying to obtain D-polylactide polyol polyurethane, which was obtained by gel chromatography (GPC) The number average molecular weight was measured to be 305,000, and the molecular weight distribution index was 1.6.

[0045] Take the prepared D-polylactide polyol polyurethane (5 parts by mass) and polylactic acid (the number average molecular weight of polylactic acid is 150,000, and its parts by mass is 95) and mix them uniformly, then melt them in a twin-scr...

Embodiment 2

[0048] Massage D type-polylactide polyol (number average molecular weight 1000, hydroxyl value 118mg KOH / g), isophorone diisocyanate (IPDI), 1,4-butanediol (DBO), dibutyl tin dilaurate After mixing with a molar ratio of 1:3:2:0.005, it is added to the reactor and reacted at 75° C. for 3 hours. Anhydrous acetone (the added amount is 50% of the total mass of the material) is added to adjust the viscosity to obtain a prepolymer.

[0049] 1,4-Butanediol (DBO) was added to the prepolymer to carry out the chain extension reaction. After the reaction, the acetone was removed by vacuum drying to obtain D-polylactide polyol polyurethane, which was obtained by gel chromatography (GPC) The number average molecular weight was measured to be 501,000, and the molecular weight distribution index was 1.7.

[0050] Take the prepared D-polylactide polyol polyurethane (5 parts by mass) and polylactic acid (the number average molecular weight of polylactic acid is 150,000, and its parts by mass is 95)...

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Abstract

The invention provides a preparation method of a polylactide-type polyurethane-modified polylactic acid alloy. The preparation method comprises the following steps: a. dissolving D-polylactide polylol, diisocyanate and a catalyst in a mole ratio of 1:(3-5):(0.001-0.01) in a solvent, and reacting in a protective gas atmosphere at 50-100 DEG C to obtain a prepolymer; b. adding a chain extender into the prepolymer, and carrying out chain extension to obtain a D-polylactide polylol polyurethane elastomer, wherein the mole ratio of the chain extender to the D-polylactide polylol is (2-4):1; and c. premixing 60-99.5 parts by mass of polylactic acid and 0.5-40 parts by mass of D-polylactide polylol polyurethane elastomer, and carrying out melt extrusion at 175-190 DEG C through a double-screw extruder. The invention also provides a polylactide-type polyurethane-modified polylactic acid alloy.

Description

Technical field [0001] The invention relates to the technical field of polymer materials, in particular to a toughened and heat-resistant polylactide polyurethane modified polylactic acid alloy and a preparation method thereof. Background technique [0002] In order to cope with the ever-increasing oil crisis, environmental pollution and greenhouse effect, bio-based polymers have become more and more popular among people and scientific and technological workers due to their biological sustainability, environmentally friendly non-toxic, most biodegradable and biological carbon sequestration advantages. Pay more attention. Among the many bio-based polymer materials, polylactic acid has gradually developed into one of the most potential applications due to its good physical and mechanical properties and low price, and has been applied to many daily-use products, such as food containers. , Beverage bottles, packaging materials, clothes and other mass consumer goods. However, polyla...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L75/06C08G18/10C08G18/76C08G18/75C08G18/73C08G18/66C08G18/42C08G18/32C08G18/12C08G18/48
Inventor 刘富熊竹高爱林俞学敏林海波王云泽王益
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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