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Polylactic acid blending composite and preparation method thereof

A technology of polylactic acid and its composition, which is applied in the field of polylactic acid blend composition and its preparation, can solve the problems of limited application fields, incomplete solution to the brittleness of polylactic acid, and high price

Inactive Publication Date: 2012-11-28
YUNNAN MINZU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The above-mentioned modification methods and modifiers have a certain effect on increasing the toughness and reducing brittleness of polylactic acid. Some of them have begun to form commercial products, but the modifiers used are mainly from petroleum products, and some of them are too expensive, and they are not green from bio-based sources. Modifiers, if bio-based polylactic acid does not use bio-based modifiers, it will be meaningless to promote polylactic acid products. At the same time, these modifiers have not completely solved the brittleness of polylactic acid. The toughness problem is still a difficult problem, limiting its field of application

Method used

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  • Polylactic acid blending composite and preparation method thereof
  • Polylactic acid blending composite and preparation method thereof
  • Polylactic acid blending composite and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0037]Add 12 kg of tetramethylene carbonate into a 20-liter stainless steel reactor with stirring, flush with nitrogen and replace the air three times, melt at 80-90 degrees under the protection of nitrogen, then add 0.6 grams of stannous octoate, and heat it at 130-150 degrees Polymerize for 5 hours, then vacuum (vacuum degree 1-10mmHg) at this temperature to remove unreacted tetramethylene carbonate, and use a melt pump to transport the material to a 20mm twin-screw extruder for discharge. 9.8 kilograms of polytetramethylene carbonate modifiers were obtained by underwater slitting and pelletizing, with a molecular weight of 380,000.

[0038] Mix the modified agent prepared above with polylactic acid. The mixing method can be simple physical mixing, or it can be granulated after melting and mixing with a mixer like ordinary plastics to obtain a modified polylactic acid composition. The adjustment ratio of flexibility, usually the amount of modifier is 5-50%, and the elongatio...

Embodiment 2

[0040] In a 1-liter glass bottle, add 300 grams of trimethylene carbonate and 200 grams of tetramethylene carbonate, replace it with high-purity nitrogen three times, add 0.5 grams of stannous octoate under nitrogen protection, and heat to 80-90 After the monomers are completely melted, stir and heat up to 120-140 degrees for 3 hours, then cool to room temperature, dissolve the product with 2000 ml of chloroform, and precipitate with 5000 ml of ethanol to obtain polytrimethylene carbonate-polytetramethylene carbonate 400 grams of modifiers, measured by GPC, have a weight-average molecular weight of 350,000 and a molecular weight distribution of 2.3, which is a rubber-like elastomer with better elasticity.

[0041] Mix the modifier prepared above with polylactic acid. The mixing method can be simple physical mixing, or it can be granulated after melting and mixing with a mixer like ordinary plastics to obtain a modified polylactic acid composition. Adjust the ratio of the degre...

Embodiment 3

[0043] In a one-liter glass bottle, add 500 grams of pentamethylene carbonate, replace it with high-purity nitrogen three times, add 0.025 grams of stannous octoate and 0.5 grams of ethylene glycol under the protection of nitrogen, heat to 100-110 degrees, and wait for a single After the body is all melted, stir and heat up to 120-140 degrees for 16 hours, then cool to room temperature, dissolve the product with 2000 milliliters of chloroform, and precipitate with 5000 milliliters of ethanol to obtain 300 grams of material. GPC measures a weight-average molecular weight of 80,000 and a molecular weight distribution of 2.3. Pentamethylene carbonate modifier.

[0044] Mix the modifier prepared above with polylactic acid. The mixing method can be simple physical mixing, or it can be granulated after melting and mixing with a mixer like ordinary plastics to obtain modified polylactic acid. Adjust according to the required flexibility. Ratio, usually the amount of modifier used is ...

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Abstract

The invention discloses a polylactic acid blending composite and a preparation method thereof. The polylactic acid blending composite is prepared by blending one or a mixture of more of polytrimethylene carbonate, polytetramethylene carbonate, polypentamethylene carbonate and polyhexamethylene carbonate with polylactic acid. The method comprises the following steps of: performing ring-opening polymerization on a cyclic carbonate monomer to obtain a polylactic acid modifying agent; and blending a polylactic acid material and the modifying agent in a required ratio to prepare composite granules or tablets, namely the polylactic acid blending composite. Membranes, fibers and injection molding products can be prepared from the modified polylactic acid blending composite by the ordinary method for processing high molecular materials.

Description

technical field [0001] The invention relates to a polylactic acid blend composition and a preparation method thereof, belonging to the field of polymer materials. Background technique [0002] Polylactic acid, also known as polylactide, is a thermoplastic linear polymer material. Because it can be completely degraded into carbon dioxide and water, and it is a 100% renewable material from bio-based, it is currently used in various fields of the national economy such as films ( (such as food packaging film, packaging bag, garbage bag, plastic film, etc.), fiber and various injection molding products (such as cups, plates, knife spreaders, etc.) have begun to be popularized and applied, providing a way for human beings to protect the environment and reduce dependence on petroleum resources. Practical ideas. It has the advantages of good degradability, biocompatibility, processability and energy saving in the production process, but at the same time has disadvantages such as br...

Claims

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Application Information

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IPC IPC(8): C08L67/04C08L69/00C08G64/02
Inventor 袁明龙陈海云常江平刘仕琦郭俊明
Owner YUNNAN MINZU UNIV
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