An antibacterial polylactic acid composite material and a preparing method thereof

A composite material, polylactic acid technology, applied in chemical instruments and methods, fibrous fillers, inorganic pigment treatment, etc., can solve the problems of limited PLA application and poor toughness, and achieve photocatalytic activity, good mechanical properties, and high antibacterial properties Effect

Active Publication Date: 2014-10-01
SHANGHAI GENIUS ADVANCED MATERIAL (GRP) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Due to the poor toughness of polylactic acid (PLA), it is a hard and brittle material at room temperature, which greatly limits the application of PLA.

Method used

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  • An antibacterial polylactic acid composite material and a preparing method thereof
  • An antibacterial polylactic acid composite material and a preparing method thereof
  • An antibacterial polylactic acid composite material and a preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Surface treatment of modified titanium dioxide:

[0033] Put 1 part of modified titanium dioxide with a particle size of 15-50nm in a two-dimensional mixer and stir; mix 0.2 part of 3-aminopropyltriethoxysilane (KH550) with 0.2 part of stearic acid, spray Put it into the mixer to modify the surface of titanium dioxide, continue to stir for 5 to 15 minutes after spraying, and set aside;

[0034] (2) Mix the raw materials evenly: put the modified titanium dioxide treated in step (1), 100 parts of polylactic acid, 10 parts of PEG and 0.3 parts of tris(2,4-di-tert-butylphenyl) phosphite in the mixer well mixed;

[0035] (3) Mixing in a twin-screw extruder: Mix the raw materials uniformly mixed in the above step (2) with a twin-screw extruder, the extrusion temperature is 150°C in the low area, 210°C at the die head, and 150°C in the middle section °C to 210 °C, the screw speed is set to 50 rpm. The polylactic acid composite material was obtained, and its properties a...

Embodiment 2

[0037] (1) Surface treatment of modified titanium dioxide:

[0038] Put 2 parts of modified titanium dioxide with a particle size of 15-50nm in a two-dimensional mixer and stir; mix 0.3 part of γ-(methacryloyloxy)propyltrimethoxysilane (KH570) with 0.3 part of calcium stearate After uniformity, spray it into the surface of the modified titanium dioxide in the mixer, continue to stir for 5-15 minutes after spraying, and set aside;

[0039] (2) Mix the raw materials evenly: put the modified titanium dioxide treated in step (1), 100 parts of polylactic acid, 15 parts of PEG and 0.5 part of phosphite tris(2,4-di-tert-butylphenyl) in the mixer mix evenly;

[0040] (3) Mixing in a twin-screw extruder: Mix the raw materials uniformly mixed in the above step (2) with a twin-screw extruder, the extrusion temperature is 150°C in the low area, 210°C at the die head, and 150°C in the middle section ℃~210℃, the screw speed was set at 60rpm, and the polylactic acid composite material was ...

Embodiment 3

[0042] (1) Surface treatment of modified titanium dioxide:

[0043] Put 2.5 parts of modified titanium dioxide with a particle size of 15-50nm in a two-dimensional mixer and stir; mix 0.5 parts of 3-aminopropyltriethoxysilane (KH550) with 0.5 parts of zinc stearate evenly, and spray Spray into the surface of the modified titanium dioxide in the mixer, continue to stir for 5 to 15 minutes after spraying, and set aside;

[0044] (2) Mix the raw materials evenly: Mix the modified titanium dioxide treated in step (1), 100 parts of polylactic acid, 20 parts of PEG and 0.7 parts of phenylene diisodecyl phosphite in a mixer;

[0045] (3) Mixing in a twin-screw extruder: Mix the raw materials uniformly mixed in the above step (2) with a twin-screw extruder, the extrusion temperature is 150°C in the low area, 210°C at the die head, and 150°C in the middle section ℃~210℃, the screw speed was set at 60rpm, and the polylactic acid composite material was prepared, and its properties are s...

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Abstract

The invention belongs to the technical field of polymer materials and relates to an antibacterial polylactic acid composite material and a preparing method thereof. The composite material is prepared from following components by weight: 100 parts of polylactic acid, 10-50 parts of an elastomer, 1-5 parts of modified titanium oxide, 0.2-1.5 parts of a coupling agent, 0.2-1.5 parts of a lubricant and 0.3-1.5 parts of an antioxidant. The nanometer titanium is adopted as a substrate and a certain amount of nanometer zinc oxide is doped, so that the light utilization rate of the titanium oxide is increased, and the composite material can maintain a high antibacterial property under actions of weak visible light. By utilization of a simple preparation process, the polylactic acid composite material with good mechanical properties, good toughness and a good antibacterial property is obtained.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and relates to an antibacterial polylactic acid composite material and a preparation method thereof. Background technique [0002] Polylactic acid (PLA), also known as polylactide, is a biocompatible and degradable thermoplastic aliphatic polyester. It has the advantages of non-toxic, non-irritating, high strength, low-carbon environmental protection, and formable processing. Widely used in food packaging, clothing, interior products, biomedical materials and other fields, it is regarded as the most likely biodegradable material to replace petroleum products. With the increasing awareness of environmental protection, health and hygiene in recent years, people have higher and higher requirements for the antibacterial properties of polylactic acid products. However, due to the poor antibacterial and antifungal properties of polylactic acid, the surface of the material will gradually breed...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L71/08C08K9/06C08K9/02C08K3/22C09C1/36C09C3/06C09C3/12
Inventor 杨桂生邓丽丽
Owner SHANGHAI GENIUS ADVANCED MATERIAL (GRP) CO LTD
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