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Fast-crystallization and high-crystallinity polylactic acid modification method

A technology of high crystallinity and polylactic acid, which is applied in the field of rapid crystallization and high crystallinity polylactic acid modification, can solve the problems of low crystallinity of polylactic acid and limit the application of polylactic acid, shorten the molding cycle, improve mechanical properties, and reduce crystallization effect of difficulty

Pending Publication Date: 2020-02-07
BENGBU COLLEGE
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  • Description
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  • Application Information

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Problems solved by technology

[0003] The factors affecting the crystallization rate of polylactic acid are divided into three aspects. The first aspect is the molding conditions including molding temperature and molding rate. The second aspect is the type and amount of crystallization nucleating agent. The low density greatly limits the application of polylactic acid, and this technical bottleneck needs to be broken through urgently

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  • Fast-crystallization and high-crystallinity polylactic acid modification method

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Embodiment 1

[0024] A kind of rapid crystallization high crystallinity polylactic acid modification method, comprises the following steps:

[0025] Step 1: Melt and extrude carbon fiber, L-polylactic acid, D-polylactic acid, polyglycolic acid, and starch through a twin-screw extruder according to a certain ratio, and the extrusion temperature is 160°C to obtain a nucleating agent. Among them, The starch content is 5%, wherein the ratio of the L-polylactic acid, D-polylactic acid, talcum powder and polymethacrylate is 80:50:1.2:1;

[0026] Step 2: In parts by weight, 55 parts of semi-crystalline polylactic acid, 0.5 part of polymer-type crystallization accelerator, 0.1 part of nucleating agent, and 1 part of plasticizer, the semi-crystalline polylactic acid is preferably semi-crystalline Poly L-lactic acid, stir evenly to obtain a mixture, mix 92 parts of the mixture and 2 parts of polymer crystallization accelerator in a ball mill, the mixing temperature is above 80°C, mix for 0.5h, and pl...

Embodiment 2

[0031] A kind of rapid crystallization high crystallinity polylactic acid modification method, comprises the following steps:

[0032] Step 1: Melt and extrude carbon fiber, L-polylactic acid, D-polylactic acid, polyglycolic acid, and starch through a twin-screw extruder according to a certain ratio, and the extrusion temperature is 190°C to obtain a nucleating agent. Among them, The starch content is 4%, wherein the ratio of the L-polylactic acid, D-polylactic acid, talcum powder and polymethacrylate is 100:75:2:1;

[0033] Step 2: In parts by weight, 95 parts of semi-crystalline polylactic acid, 2 parts of polymer crystallization accelerator, 10 parts of nucleating agent, and 3 parts of plasticizer, the semi-crystalline polylactic acid is preferably semi-crystalline Poly L-lactic acid, stir evenly to obtain a mixture, mix 98 parts of the mixture and 8 parts of polymer crystallization accelerator in a ball mill, the mixing temperature is above 85°C, mix for 1.5h, and place in...

Embodiment 3

[0038] A kind of rapid crystallization high crystallinity polylactic acid modification method, comprises the following steps:

[0039]Step 1: Melt and extrude carbon fiber, L-polylactic acid, D-polylactic acid, polyglycolic acid, and starch through a twin-screw extruder according to a certain ratio, and the extrusion temperature is 180°C to obtain a nucleating agent. Among them, The starch content is 3%, wherein the ratio of the L-polylactic acid, D-polylactic acid, talcum powder and polymethacrylate is 90:65:1.5:1;

[0040] Step 2: In parts by weight, 65 parts of semi-crystalline polylactic acid, 1.5 parts of polymer crystallization accelerator, 5 parts of nucleating agent, and 2 parts of plasticizer, the semi-crystalline polylactic acid is preferably semi-crystalline Poly L-lactic acid, stir evenly to obtain a mixture, mix 95 parts of the mixture and 6 parts of polymer crystallization accelerator in a ball mill, the mixing temperature is above 82°C, mix for 1 hour, and place...

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Abstract

The invention discloses a fast-crystallization and high-crystallinity polylactic acid modification method which comprises the following steps: 1, performing melting extrusion on carbon fiber, L-polylactic acid, D-polylactic acid, polyglycolic acid and starch through a twin screw extruder so as to obtain a nucleating agent; 2, in parts by weight, putting semi-crystalline polylactic acid, a polymertype crystal accelerator, the nucleating agent and a plasticizer into a container according to a ratio, adding a dichloromethane solvent, performing stirring with a magnetic stirrer, and performing volatilization at room temperature to remove the solvent so as to obtain a lactic acid premix; and 3, melting and blending the polylactic acid premix with polyvinylidine according to a ratio, so as to obtain a polylactic acid complex. The method has the beneficial effects that a molding process is improved, the polymer type crystal accelerator is added to reduce activation energy required for formation of lattice of polylactic acid, the difficulty of crystallization can be reduced, and the crystallization rate can be increased.

Description

technical field [0001] The invention relates to the field of polylactic acid preparation, in particular to a rapid crystallization and high crystallinity polylactic acid modification method. Background technique [0002] Polylactic acid is a bio-based and degradable polymer material with excellent physical and mechanical properties, biodegradability and biocompatibility, and is widely used in agriculture, packaging materials, daily life, clothing and biomedical materials. Good application prospects. [0003] Factors affecting the crystallization rate of polylactic acid are divided into three aspects. The first aspect is the molding conditions including molding temperature and molding rate. The second aspect is the type and amount of crystallization nucleating agent. The low density greatly limits the application of polylactic acid, and this technical bottleneck needs to be broken through urgently. Contents of the invention [0004] In order to overcome the deficiencies i...

Claims

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Application Information

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IPC IPC(8): C08L67/04C08L3/02C08L27/16C08L67/02C08L31/04C08L33/10C08K13/06C08K7/06C08K5/103C08K5/12C08K5/11C08K3/34
CPCC08K2201/014C08L67/04C08L2205/02C08L2205/025C08L2205/035C08L2205/24C08L3/02C08L27/16C08L67/02C08L31/04C08L33/10C08K13/06C08K7/06C08K5/103C08K5/12C08K5/11C08K3/34C08K3/346
Inventor 吴景梅石春杰赵建军韩言松
Owner BENGBU COLLEGE
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