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Preparation method and application of high-melt-strength polylactic acid

A high melt strength, polylactic acid technology, applied in the field of polylactic acid preparation, can solve the problems of low foaming ratio, difficult industrialization, and high temperature, and achieve the effects of increased cell density, enhanced crystallization performance, and increased foaming ratio.

Pending Publication Date: 2022-01-14
HUBEI CHINA TOBACCO IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The melt strength of the polylactic acid prepared by this invention is not high, and its foaming performance is poor,
[0006] The temperature of the liquid phase reaction of the polylactic acid prepared in the prior art is high, the preparation process is complicated, the industrialization is difficult, and the melt strength of the prepared polylactic acid is poor, and the expansion ratio is low when the polylactic acid is used to prepare the foaming material

Method used

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  • Preparation method and application of high-melt-strength polylactic acid
  • Preparation method and application of high-melt-strength polylactic acid
  • Preparation method and application of high-melt-strength polylactic acid

Examples

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Effect test

Embodiment 1

[0038] A method for preparing high melt strength polylactic acid, including the following steps:

[0039] (1) After drying at 80 ° C for 6 h, it was mixed with peroxide, acetone, and three functional groups, and a mixture was mixed, and the trifunomacrylate, sterior oxidation dibenzoyl, acetone, The mass ratio is 32: 1: 5, the addition of the three-functional group acrylate is 1.6% of polylactic acid, polylactic acid (2003d), the melt index Mi is 6.0 g / 10 min, the trifunctional acrylate can be three Hydroxymethyl propane triacrylate;

[0040] (2) Place the mixture in an oven for secondary dry, the secondary drying to bake 0.5h in an oven at 92 ° C for 0.5h in an oven for baking 30s, grafted modified high melt Strength polylactic acid, as a A1 substance, extruded molding obtained (grafted modified) high melt strength polylactic acid blend particles B1, the extruded molded temperature is 155 ° C, and the rotational speed is 30 rpm.

[0041] The high melt strength polylactic acid b...

Embodiment 2

[0045] A method for preparing high melt strength polylactic acid, including the following steps:

[0046] (1) After drying at 80 ° C for 6 h, it was mixed with peroxide, acetone, and three functional groups, and a mixture was mixed, and the trifunomacrylate, sterior oxidation dibenzoyl, acetone, The mass ratio is 32: 1: 5, the addition of the three-functional group of acrylate is 2.0% of polylactic acid, polylactic acid (2003d), and the melt index Mi is 6.0 g / 10 min, and the trifunction acrylate can be three Hydroxymethyl propane triacrylate;

[0047] (2) Place the mixture in an oven for secondary drying, the secondary drying to bake 40min in an oven at 92 ° C for 40 minutes to bake 30s, grafted modified high melt strength Polylactic acid, as a A2 substance, extruded molded (grafted modified) high melt strength polylactic acid blend particles B2, the extruded molded temperature is 165 ° C, and the rotational speed is 30 rpm.

[0048] The high melt strength polylactic acid blend ...

Embodiment 3

[0052] A method for preparing high melt strength polylactic acid, including the following steps:

[0053] (1) After drying at 80 ° C for 6 h, it was mixed with peroxide, acetone, and three functional groups, and a mixture was mixed, and the trifunomacrylate, sterior oxidation dibenzoyl, acetone, The mass ratio is 32: 1: 5, the addition of the three-functional junkate is 2.4%, polylactic acid (2003d), and the melt index Mi is 6.0 g / 10 min, the trifunctional acrylate can be three Hydroxymethyl propane triacrylate;

[0054] (2) Place the mixture in an oven for secondary drying, the secondary drying to bake 60 min in an oven at 92 ° C for 60 minutes to bake 30s, grafting modified high melt strength Polylactic acid, as A3 substance, extruded molding obtained (grafted modified) high melt strength polylactic acid blend particles B3, the extruded molding temperature of 185 ° C, and the rotational speed is 30 rpm.

[0055] The high melt strength polylactic acid blend particles were place...

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Abstract

The invention provides a preparation method and application of high-melt-strength polylactic acid, and belongs to the technical field of polylactic acid preparation. The preparation method of the high-melt-strength polylactic acid comprises the following steps: (1) uniformly mixing polylactic acid with dibenzoyl peroxide, acetone and trifunctional acrylate; and (2) placing the mixture in an oven for secondary drying, and carrying out extrusion molding to obtain the high-melt-strength polylactic acid blend particles. The application of the high-melt-strength polylactic acid comprises the steps: putting the high-melt-strength polylactic acid blend particles and nano calcium carbonate into a reaction kettle, introducing CO2, and reacting to obtain the polylactic acid PLA foamed beads. Benzoyl peroxide (BPO) is taken as an initiator, trifunctional acrylate is taken as a grafting monomer, the high-melt-strength polylactic acid PLA is obtained through solid-phase grafting, the prepared polylactic acid is high in melt strength, the foaming ratio during foaming reaches 19.23%, and nano calcium carbonate is taken as a foaming medium, so that the polylactic acid foamed beads with high foaming ratio are obtained.

Description

Technical field [0001] The present invention belongs to the technical field of polylactic acid preparation, and more particularly to a method of preparing high melt strength polylactic acid and its application thereof. Background technique [0002] The polylactic acid is a polymer obtained by polymerizing the lactic acid as the main raw material, and the source of the material is sufficient and can be regenerated. The production process of polylactic acid has no pollution, and the product can be biodegraded, and the circulation of the natural world is a green polymer material. [0003] The thermal stability of the polylactic acid is good, the processing temperature is 170 ~ 230 ° C, and there is a good oblique solution, which can be processed in a variety of ways, such as extrusion, spinning, biaxial stretching, injection molding. Products made from polylactic acid except biodegradation, biocompatibility, gloss, transparency, hand and heat resistance. Polylactic acid (PLA) also h...

Claims

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Application Information

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IPC IPC(8): C08F283/02C08F222/14C08L51/08C08J9/18C08J9/12
CPCC08F283/02C08J9/18C08J9/122C08J2351/08C08J2203/06C08J2203/08C08F222/103
Inventor 黄轲刘文婷贾伟萍李冉闫爱华程占刚胡素霞王娜陈琳廖宇
Owner HUBEI CHINA TOBACCO IND
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