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A calcium sulfate whisker reinforced toughened polylactic acid composite material and preparation method thereof

A calcium sulfate whisker, reinforcement and toughening technology, applied in the field of polylactic acid, can solve the problems of low impact toughness, limited application fields, and poor flexibility of PLA

Active Publication Date: 2017-12-26
苏州苏湖新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, PLA's poor flexibility, low impact toughness and particularly obvious low-temperature brittleness limit the application fields of its products to a large extent.
Although many literatures show that adding plasticizers or introducing thermoplastic elastomers is the most effective way to improve its toughness, it is often at the expense of the strength and stiffness of the material.

Method used

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  • A calcium sulfate whisker reinforced toughened polylactic acid composite material and preparation method thereof
  • A calcium sulfate whisker reinforced toughened polylactic acid composite material and preparation method thereof

Examples

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Embodiment 1

[0027] A calcium sulfate whisker-reinforced and toughened polylactic acid composite material proposed by the present invention, its raw materials include by weight percentage: polylactic acid 89%, composite masterbatch 10%, Irganox1010 0.5%, Irgafos168 0.5%;

[0028] The melt index of polylactic acid is 10g / 10min, and the density is 1.25g / cm 3 .

[0029] The preparation method of the composite masterbatch is as follows: dissolve polylactic acid in tetrahydrofuran, then add surface-treated calcium sulfate whiskers, the weight ratio of surface-treated calcium sulfate whiskers to polylactic acid is 1:2, stir for 3 hours to obtain a mixed Suspension: Pour the mixed suspension into absolute ethanol for precipitation, then wash, freeze-dry, and pulverize to obtain a composite masterbatch; in the composite masterbatch, the content of calcium sulfate whiskers after surface treatment is 50 wt%.

[0030] The preparation method of the surface-treated calcium sulfate whiskers is as follo...

Embodiment 2

[0033] A calcium sulfate whisker-reinforced and toughened polylactic acid composite material proposed by the present invention, its raw materials include by weight percentage: polylactic acid 79%, composite masterbatch 20%, Irganox1010 0.5%, Irgafos168 0.5%;

[0034] The melt index of polylactic acid is 20g / 10min, and the density is 1.25g / cm 3 .

[0035] The preparation method of the composite masterbatch is as follows: dissolve polylactic acid in tetrahydrofuran, then add surface-treated calcium sulfate whiskers, the weight ratio of surface-treated calcium sulfate whiskers to polylactic acid is 1:2, and stir for 4 hours to obtain a mixed Suspension: Pour the mixed suspension into absolute ethanol for precipitation, then wash, freeze-dry, and pulverize to obtain a composite masterbatch; in the composite masterbatch, the content of calcium sulfate whiskers after surface treatment is 50 wt%.

[0036] The preparation method of the surface-treated calcium sulfate whiskers is as f...

Embodiment 3

[0039] A calcium sulfate whisker-reinforced and toughened polylactic acid composite material proposed by the present invention, its raw materials include by weight percentage: polylactic acid 69%, composite masterbatch 30%, Irganox1010 0.5%, Irgafos168 0.5%;

[0040] The melt index of polylactic acid is 12g / 10min, and the density is 1.25g / cm 3 .

[0041] The preparation method of the composite masterbatch is as follows: dissolve polylactic acid in tetrahydrofuran, then add surface-treated calcium sulfate whiskers, the weight ratio of surface-treated calcium sulfate whiskers to polylactic acid is 1:2, and stir for 4 hours to obtain a mixed Suspension: Pour the mixed suspension into absolute ethanol for precipitation, then wash, freeze-dry, and pulverize to obtain a composite masterbatch; in the composite masterbatch, the content of calcium sulfate whiskers after surface treatment is 50 wt%.

[0042] The preparation method of the calcium sulfate whisker after surface treatment ...

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Abstract

The invention discloses a calcium sulfate whisker reinforced and toughened polylactic acid composite. The composite comprises the following raw materials in percent by weight: 49 to 89.9 percent of polylactic acid, 10 to 50 percent of composite masterbatch, and 0.1 to 2 percent of an antioxidant, wherein the composite masterbatch adopts polylactic acid modified by calcium sulfate whisker which is subjected to surface treatment. The invention further discloses a preparation method of the calcium sulfate whisker reinforced and toughened polylactic acid composite. The composite adopts calcium sulfate whisker reinforced and toughened polylactic acid, wherein the calcium sulfate whisker is subjected to proper surface pretreatment, so as to ensure that calcium sulfate whisker is uniformly dispersed in a polylactic acid matrix, therefore the impact toughness and the tensile strength of the polylactic acid are improved, and the processability is improved.

Description

technical field [0001] The invention relates to the technical field of polylactic acid, in particular to a calcium sulfate whisker-reinforced and toughened polylactic acid composite material and a preparation method thereof. Background technique [0002] Polylactic acid (PLA) is a synthetic thermoplastic resin with excellent biocompatibility and absorbability, and is widely used in biomedical fields. The renewability and complete biodegradability of PLA's plant raw materials determine that it also has great application potential in daily life and industry. However, PLA's poor flexibility, low impact toughness and particularly obvious low-temperature brittleness limit the application fields of its products to a large extent. Although many literatures show that adding plasticizers or introducing thermoplastic elastomers is the most effective means to improve its toughness, but it is often at the expense of the strength and stiffness of the material. [0003] Calcium sulfate ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/04C08K9/06C08K9/04C08K7/08C08J3/22
CPCC08J3/226C08J2367/04C08J2467/04C08K2201/003C08K2201/004C08L67/04C08K9/06C08K7/08C08K9/04
Inventor 杨继年杨双萍朱金波
Owner 苏州苏湖新材料科技有限公司
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