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Modified glass fiber reinforced polylactic acid composite material and preparation method thereof

A technology of glass fiber and composite materials, applied in the field of composite materials, can solve the problems of high brittleness and poor compatibility, and achieve the effect of simple production method, low cost, and improvement of high brittleness of polylactic acid

Active Publication Date: 2010-08-25
溧阳常大技术转移中心有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a modified glass fiber reinforced polylactic acid composite material, which overcomes the defects of high brittleness and poor compatibility of existing polylactic acid composite materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] formula:

[0022] 100 parts of polylactic acid, 30 parts of glass fiber, 5 parts of polyester polyurethane prepolymer.

[0023] Among them, the number average molecular weight of polylactic acid is about 70,000, the functionality of polyester polyurethane prepolymer is 1.9, and the content of isocyanate is 5.1%.

[0024] Preparation:

[0025] 1) Glass fiber modification stage: put 3 parts of polylactic acid into acetone, heat and dissolve at 40°C, add glass fiber and polyester polyurethane prepolymer, stir for 1.5 hours, filter, and dry at 80°C for 5 hours , to obtain modified glass fibers,

[0026] 2) Mixing stage: 97 parts of polylactic acid and modified glass fiber were mixed evenly, and mixed by an extruder at 170° C., extruded and cut into pellets.

Embodiment 2

[0028] formula:

[0029] 100 parts of polylactic acid, 35 parts of glass fiber, 10 parts of polyether polyurethane prepolymer.

[0030] Among them, the number average molecular weight of polylactic acid is about 80,000, the functionality of polyether type polyurethane prepolymer is 2, and the content of isocyanate is 5.5%.

[0031] Preparation:

[0032] 1) Glass fiber modification stage: put 5 parts of polylactic acid into acetone, heat and dissolve at 40°C, add glass fiber and polyether polyurethane prepolymer, stir for 3 hours, filter, and dry at 90°C for 3 hours , to obtain modified glass fibers,

[0033] 2) Mixing stage: Mix 95 parts of polylactic acid and modified glass fiber evenly, and mix the mixture at 200° C. with an internal mixer, and cut into pellets.

Embodiment 3

[0035] formula:

[0036] 100 parts of polylactic acid, 40 parts of glass fiber, 5 parts of polyester polyurethane prepolymer mixture.

[0037] Among them, the number average molecular weight of polylactic acid is about 80,000, the functionality of polyester polyurethane prepolymer is 2.1, and the content of isocyanate is 6%. The functionality of polyether polyurethane prepolymer is 1.9, and the content of isocyanate is 5%. The mass ratio of ester type to polyether type is 1:2.

[0038] Preparation:

[0039] 1) Glass fiber modification stage: put 3 parts of polylactic acid into acetone, heat and dissolve at 50°C, add glass fiber and polyester polyurethane prepolymer, stir for 2 hours, filter, and dry at 70°C for 7 hours , to obtain modified glass fibers,

[0040] 2) Mixing stage: 97 parts of polylactic acid and modified glass fiber were mixed evenly, and mixed by an extruder at 180° C., extruded and cut into pellets.

[0041]

Tensile Strength

Notched impact...

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Abstract

The invention relates to a modified glass fiber reinforced polylactic acid composite material and a preparation method thereof, relating to the field of composite materials. The composite material comprises the following components in parts by weight: 100 parts of polylactic acid, 30-40 parts of glass fiber, 5-10 parts of polyurethane prepolymer, and can be added with other components according to practical demand, such as a flame retardant agent, an antioxidant, color masterbatch and the like. The preparation method comprises the following steps: placing polylactic acid into acetone, heating and dissolving at the temperature of 40 to 50 DEG C, then adding glass fiber and polyurethane prepolymer, stirring for 1 to 2 hours, filtering, drying for 3 to 7 hours, obtaining modified glass fiber, mixing the polylactic acid and the modified glass fiber evenly, mixing the materials by an extruder or an internal mixer at the temperature of 170 to 200 DEG C, cutting into granules and obtaining the composite material. The invention overcomes the defects that the existing polylactic acid composite material has large fragility and poor compatibility, and can achieve the requirements of simultaneously strengthening and toughening the polylactic acid.

Description

technical field [0001] The invention belongs to the field of composite materials, in particular to a modified glass fiber reinforced polylactic acid composite material and a preparation method thereof. Background technique [0002] Polylactic acid (PLA) is a biodegradable plastic derived from renewable starch resources. It has excellent biocompatibility, antibacterial properties, mechanical properties and processing properties. It is currently the most environmentally friendly plastic with application prospects. For a long time, due to its own shortcomings, such as high brittleness, poor compatibility, high price, slow crystallization speed and few types of modification, its large-scale application has been limited. In order to overcome these defects, it is necessary to carry out compound modification to expand its application field. [0003] Polylactic acid composite materials use polylactic acid as the matrix, and perform "internal reinforcement" by compounding ultrafine ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08K9/04C08K7/14C08J5/08
Inventor 李锦春卢仁杰韩冰
Owner 溧阳常大技术转移中心有限公司
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