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Method for preparing polyurethane-nanosilver long-acting antibacterial film by post-heat treatment modification method

A technology of polyurethane and nano-silver, which is applied in the field of antibacterial materials, can solve the problems of deterioration, unsuitable surface modification, and difficulty in polymer synthesis, and achieve the effects of simplifying the reaction process, good long-term antibacterial properties, and avoiding the difficulty of synthesis

Active Publication Date: 2017-09-15
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this hydrophobic modification method requires special functional groups on the surface of the polymer, and in order to ensure the smooth implementation of subsequent modification reactions, the functional groups (such as alkynyl, alkenyl, azide, etc.) The chemical properties are often relatively active and prone to side reactions and deterioration, which makes the synthesis of this type of polymer difficult, and is not suitable for surface modification of ordinary polyurethane materials.

Method used

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  • Method for preparing polyurethane-nanosilver long-acting antibacterial film by post-heat treatment modification method
  • Method for preparing polyurethane-nanosilver long-acting antibacterial film by post-heat treatment modification method
  • Method for preparing polyurethane-nanosilver long-acting antibacterial film by post-heat treatment modification method

Examples

Experimental program
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Effect test

Embodiment 1-3

[0047] A method for preparing a polyurethane-nanosilver long-acting antibacterial film by a modification method after heat treatment includes the following steps:

[0048] (1) Preparation of polyurethane-nano silver film

[0049] Add 4,4'-dicyclohexylmethane diisocyanate (7.5g) and polytetrahydrofuran (7.9g) into a 100mL three-necked flask, and stir for 2 hours at a constant temperature of 90°C with a digital display electric stirrer for pre-polymerization reaction. After the completion, reduce the temperature to 70℃; Dissolve trimethylolpropane (0.178g) and 1,6-hexanediol (2.21g) in acetone (15mL) and pour into a three-necked flask, then add dimethylol Propionic acid (0.180g), 3 drops of dibutyltin dilaurate, and the temperature rose to 80°C to continue the reaction for 3 hours. Then, the mass percentages of 1% (Example 1), 5% (Example 2), and 10% (Example 3) of silver nitrate solids were dissolved in dimethylformamide (5 mL), and then divided with a dropper. Add the polyurethan...

Embodiment 4

[0064] As described in Example 1, the difference is:

[0065] In step (1), the pre-polymerization reaction temperature is 100°C, and the reaction temperature is 70°C after adding dimethylolpropionic acid and dibutyltin dilaurate;

[0066] The heat treatment temperature in step (3) is 140°C.

Embodiment 5

[0068] As described in Example 1, the difference is:

[0069] In step (1), the mass ratio of diisocyanate, polytetrahydrofuran, crosslinking agent, chain extender, dimethylolpropionic acid and catalyst is 1:1.1:0.024:0.28:0.02:0.003.

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Abstract

The invention relates to a method for preparing a polyurethane-nanosilver long-acting antibacterial film by a post-heat treatment modification method, which includes the following steps: (1) diisocyanate and polytetrahydrofuran are mixed to react; a cross-linking agent and an acetone solution of a chain extender are added, dimethylolpropionic acid and a catalyst are added, reaction takes place, and thereby PU (polyurethane) is obtained; a dimethylformamide solution of silver nitrate is added into a polyurethane solution, a film is formed after uniform stirring, heat treatment is carried out, and thereby a polyurethane-nanosilver film is obtained; (2) 4,4'-dihydroxybenzophenone reacts with long-chain alkyl halide, so that 4,4'-bis-long-chain alkoxy benzophenone is obtained; the 4,4'-bis-long-chain alkoxy benzophenone reacts with hydrazine hydrate, so that 4,4'-bis-long-chain alkoxy benzophenone hydrazone is obtained; and the 4,4'-bis-long-chain alkoxy benzophenone hydrazone undergoes oxidation reaction, so that long-chain alkyl diazomethane is obtained; (3) the long-chain alkyl diazomethane is dissolved into a solvent, and is uniformly applied onto the surface of the polyurethane-nanosilver film, and after heat treatment, the polyurethane-nanosilver long-acting antibacterial film is obtained. The method can be used for realizing long-acting bacteria resistance.

Description

Technical field [0001] The invention relates to a method for preparing a polyurethane-nano silver long-acting antibacterial film by a modification method after heat treatment, and belongs to the technical field of antibacterial materials. Background technique [0002] Polyurethane is an important type of medical polymer material, with excellent blood compatibility, good biological stability and mechanical properties. Fu Qiang et al. (Tan Hong, Li Jiehua, Fu Qiang. Design, preparation and performance of biomedical phospholipid polyurethane. Science in China: Chemistry, 42(5), pp 661-675, 2012.) The research shows that polyurethane has the same characteristics as natural blood vessels. The most matching compliance, especially suitable for blood contact devices, has an irreplaceable role in surgical treatment. However, interventional medical polymer materials must have long-lasting antibacterial properties, otherwise they will easily cause postoperative infections during clinical a...

Claims

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Application Information

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IPC IPC(8): C08J7/12C08J7/00C08J5/18C08L75/08C08K3/08C08G18/75C08G18/66C08G18/48C08G18/34C08G18/32C08G18/10
CPCC08G18/10C08G18/4854C08G18/6674C08G18/6677C08G18/6692C08G18/758C08J5/18C08J7/08C08J7/12C08J2375/08C08K3/08C08K2003/0806C08K2201/011C08L2203/16C08L75/08C08G18/348
Inventor 杨鹏飞张志良李俊英卢玲刘联于溪
Owner QILU UNIV OF TECH
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