Light degradation antibiotic polylactic acid material and preparation method thereof

A polylactic acid and photodegradation technology, which is applied in the field of composite materials to achieve the effects of enhancing interaction, achieving uniform and stable dispersion, and improving glass transition temperature and mechanical properties

Inactive Publication Date: 2008-07-09
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Polylactic acid and nano-TiO 2 The method of preparing photodegradable anti

Method used

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  • Light degradation antibiotic polylactic acid material and preparation method thereof

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Example Embodiment

[0031] 2. Preparation of photodegradable antibacterial polylactic acid composite material

[0032] Organically treated lactide and TiO with different contents 2 (Organized TiO 2 The mass fractions of 1.0wt%, 3.0wt%, 5.0wt%, 10wt%) were put into 5 straight sealed tubes respectively, added with the tetrahydrofuran solution of stannous octoate and the magnets, stirred, and evacuated under the protection of nitrogen atmosphere. Seal the tube, place the sealed tube in an oil bath at 150°C for pre-polymerization for 2 hours, and then polymerize at 150°C for 24 hours to prepare PLA substrate and nano-TiO 2 / PLA composite material, marked as TiO 2 -x / PLA(x is TiO 2 Quality score). After the prepared sample is formed into a film by hot pressing or a solution, it is stored in a desiccator for later use.

Example Embodiment

[0033] Example 1:

[0034] 1.TiO 2 Organic treatment

[0035] Add 6g anatase nano TiO 2 Mix with 300 mL methyl ethyl ketone, ultrasonically disperse for 10 min, mix with 300 mL methyl ethyl ketone solution containing 2.4 g KH570 silane coupling agent (γ-methylacetoxypropyltrimethoxysilane), and reflux at 80° C. for 3 hours. Cooled to room temperature, centrifuged, and dried at 100°C to obtain organically treated TiO 2, Keep it in a desiccator for later use. The result of acetone treatment is similar to the material performance obtained by methyl ethyl ketone.

[0036] 2. Preparation of photodegradable antibacterial polylactic acid composite material

[0037] The purified lactide and the organically treated TiO with a mass fraction of 1.0wt% 2 Put it into a straight sealed tube, add the tetrahydrofuran solution of stannous octoate and stir with a magnet, vacuum seal the tube under the protection of nitrogen atmosphere, place the sealed tube in a 150℃ oil bath for pre-polymerization...

Example Embodiment

[0038] Example 2: Perform nano-TiO according to the method described in Example 1 2 The difference is that the dispersant is triethylamine, and the reagent used for the organic modification is titanate coupling agent (NDZ105, isopropyl trioleic acid acyloxy titanate). Other treatment methods And the reaction conditions are the same.

[0039] Purification of lactide and preparation of photodegradable antibacterial polylactic acid composite material were carried out according to the method described in Example 1. The difference is that the catalyst is stannous chloride and the nano TiO is used. 2 The mass fraction of L-lactide is 3.0wt%, and other treatment methods and reaction conditions are the same. The resulting composite material is labeled TiO 2 -3 / PLA.

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Abstract

The invention relates to a composite material of light-degradation antibiotic polylactic acid, which mainly comprises polylactic acid and nanometer TiO2, wherein, the content of polylactic acid is 90.0% to 99.0%, the content of nanometer TiO2 is 1.0%to 10.0%. The process for preparation comprises adding coupling agent to flow back for 2-4 hors under the temperature of 80 DEG C+-10 DEG C after dispersing nanometer TiO2 in methyl ethyl ketone, acetone or triethylamine disperser in ultrasonic, placing in a straight sealing tube with lactide after whizzing and drying, adding accelerating agent, and preparing in 150 DEG C +- 10 DEGC vacuum to polymerize for 2-4 hours. Compared with polylactic acid, the heat decomposition temperature, the glass transformation temperature and mechanical properties of the invention are all greatly improved, and the invention has the functions of antibacterial activity and ultraviolet absorption, the degradation rate is obviously accelerated under the radiation of ultraviolet light and natural conditions, and the invention has complete biodegradability. The composite material of light-degradation antibiotic polylactic acid of the invention adopts an in-situ polymerization, whose processing technology is simple, production cost is low, and application prospect is wide.

Description

technical field [0001] The invention relates to a photodegradable antibacterial polylactic acid material, a preparation method and application, and belongs to the field of composite materials. Background technique [0002] Bacteria, mold (fungi) have very big harm to the mankind as pathogenic bacteria, influence people's health and even endanger life. With the improvement of people's living standards and the enhancement of hygiene and health awareness, the research and development of "antibacterial materials" with antibacterial and sterilizing functions has become one of the hot spots in the research and development of high technology and new materials. Add antibacterial agents to glaze slurry, plastics, coatings, fibers and other materials in different proportions to produce different types of antibacterial materials such as long-lasting antibacterial ceramics, antibacterial and mildew-proof coatings, antibacterial plastics, antibacterial fabrics, photocatalytic antibacteri...

Claims

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Application Information

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IPC IPC(8): C08L67/04C08K3/22C08K9/04C08G63/08C08G63/78
Inventor 沈健胡柏星庄韦刘靖崔举庆
Owner NANJING UNIV
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