Preparation method of polylactic acid/polycaprolactone/polyformaldehyde blend

A technology of polycaprolactone and polylactic acid, which is applied in the field of preparation of polylactic acid/polycaprolactone/polyoxymethylene blends, can solve the problems that the toughening effect of PLA cannot be fully exerted, and achieve good biocompatibility and Biodegradability, simple industrial preparation, effect of improving tensile toughness

Active Publication Date: 2018-06-01
HAINAN UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the non-patent literature [Polymer[J] 2011; 42:7831-7840] shows that PLA and PCL are incompatible blending systems, resulting in that the toughening effect of PCL on PLA cannot be fully exerted.

Method used

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  • Preparation method of polylactic acid/polycaprolactone/polyformaldehyde blend
  • Preparation method of polylactic acid/polycaprolactone/polyformaldehyde blend
  • Preparation method of polylactic acid/polycaprolactone/polyformaldehyde blend

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Dry PLA, PCL, and POM resins in a vacuum drying oven at 50°C for 12 hours; take 80 parts of PLA, 20 parts of PCL, and 1 part of the third component POM, mix and stir them and add them to the internal mixer. The temperature of the internal mixer is 180°C and the speed is 50rpm, blending time 8min, to obtain a mass fraction ratio of PLA / PCL / POM (80:20:1) blend.

[0030] The banburyed blend was pressed into a 1.0 mm thick sheet on a hot press. Hot pressing conditions: template temperature 210°C, pressure 15MPa, the pressing is completed within 9 minutes. Then transferred to a cold press, water cooling under 15MPa to obtain a quenched thin slice sample. Finally, standard specimens were cut with a dumbbell-shaped cutter for tensile performance testing.

Embodiment 2

[0032] The mass fraction of POM in Example 1 was changed to 2 parts, and other experimental conditions were the same as in Example 1, and finally a PLA / PCL / POM (80:20:2) blend was obtained.

Embodiment 3

[0034] The mass parts of POM in Example 1 were changed to 3 parts, and other experimental conditions were the same as in Example 1, and finally a PLA / PCL / POM (80:20:3) blend was obtained.

[0035] The samples obtained in Examples 1-3 and Comparative Example 1 were tested for tensile properties, and the results are shown in Table 1.

[0036] The samples obtained in Examples 1 to 3 and Comparative Example 1 were observed by a scanning electron microscope, and the obtained results were as follows: figure 1 (A), (B), (C), (D) shown.

[0037] As shown in Table 1, after adding a small amount of POM, the elongation at break of PLA / PCL blends increased significantly, and the tensile strength also increased to a certain extent.

[0038] Such as figure 1As shown, after adding POM, the size of the PCL dispersed phase is obviously refined, the interface between the PLA matrix phase and the PCL dispersed phase is obviously blurred, and the interfacial adhesion is enhanced.

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Abstract

The invention relates to a preparation method of a polylactic acid / polycaprolactone / polyformaldehyde blend and belongs to the field of high polymer materials. The blend is prepared by mixing polylactic acid, polycaprolactone and polyformaldehyde. The polylactic acid used in the invention is bio-based polymer resin taking renewable biological resources as raw materials and has abundant raw materialsources, good biocompatibility and biodegradability and no pollution to the environment. The polycaprolactone is also biodegradable synthetic polymer resin, has good processing properties, and biocompatibility similar to that of the polylactic acid, and is widely applied to the aspects of medical fields, biodegradable packaging plastics and the like. Therefore, the prepared blending material belongs to an environment-friendly material. Meanwhile, according to the preparation method disclosed by the invention, by adding a small amount of polyformaldehyde, the tensile toughness of the polylactic acid / polycaprolactone blending material can be greatly improved.

Description

technical field [0001] The invention relates to a preparation method of a polylactic acid / polycaprolactone / polyoxymethylene blend, belonging to the field of polymer materials. Background technique [0002] With the rapid development of the national economy, the use of polymer materials has penetrated into all aspects of life, especially the use of plastic products. However, traditional plastic products are mainly made of petroleum-based materials, such as polypropylene and polyethylene, which are difficult to degrade after being discarded in nature after use, causing the problem of "white pollution" that seriously threatens the ecological environment. On the other hand, the depletion of non-renewable petrochemical resources represented by petroleum and the rising price have brought a huge impact on the traditional plastic industry. Therefore, the development of fully biodegradable polymer materials has become a research hotspot at home and abroad. [0003] Polylactic acid ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L59/00
CPCC08L67/04C08L2201/06C08L2205/025C08L2205/03C08L2205/08C08L59/00
Inventor 徐鼐宋子健庞素娟潘莉莎黄秀龙鲁雪莉黎坛
Owner HAINAN UNIVERSITY
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