Silver-Dispersed Siloxane Anti-Bacterial Composition
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Solution Overview
Problem
Metallic ion-type anti-bacterial agents face challenges in achieving well-dispersed distribution within polymers due to differences in interface properties, leading to poor dispersion and accumulation issues.
Innovation Solution
An anti-bacterial composition comprising silver atoms well-dispersed in a meshed organic siloxane material with amino groups, achieved by mixing tetraethyl orthosilicate with aminosilane, dissolving silver salts in ammonium hydroxide, and reducing silver ions with hydrazine to form silver atoms, which are then bound to the amino groups within the siloxane structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metallic ion type anti-bacterial agents are used, then anti-bacterial ability is provided, but the metallic ions are easy to accumulate and not easy to be dispersed well in the polymer
Solution Approach 1:
The patent changes the chemical form of silver from ionic state (Ag+) to atomic state (Ag0) through reduction reaction. This parameter change from ion to atom fundamentally alters the interaction with polymer matrix, enabling better dispersion and preventing accumulation while maintaining anti-bacterial efficacy.
Solution Approach 2:
The patent introduces organic siloxane material as an intermediary carrier that facilitates the dispersion of silver atoms within the polymer matrix. The organic siloxane acts as a mediator between the inorganic silver atoms and the polymer, improving compatibility and distribution uniformity.
2Reliability
If metallic ions are fixed on porous material surface, then anti-bacterial function is achieved, but the interface properties cause poor dispersion in polymer
Solution Approach 1:
The patent creates a composite structure where silver atoms are incorporated into organic siloxane material, forming a new composite system. This composite approach combines the advantages of both silver's anti-bacterial property and organic siloxane's compatibility with polymer matrices, eliminating the interface compatibility issues of traditional metallic ion approaches.
Solution Approach 2:
The patent transforms silver from fixed ionic form on porous material surfaces to mobile atomic form dispersed within the organic siloxane-polymer composite. This parameter change from fixed to dispersed state improves interface compatibility and eliminates accumulation problems.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The resulting anti-bacterial composition effectively disperses silver atoms at a nano-scale within the polymer, enhancing thermostability and anti-bacterial properties against microorganisms like S. aureus, B. subtilis, P. aeruginosa, and E. coli, while maintaining corrosion resistance.
Implementation Method 1
adding hydrazine into the mixture of step (b), stirring the mixture in nitrogen to reduce the silver ions to form silver atoms
Implementation Method 2
the plurality of silver atoms are well dispersed in the meshed structure by binding to the amino group
Data Source
AI summary
The invention discloses an anti-bacterial composition and method for producing the same. The anti-bacterial composition of the invention includes an organic siloxane material which comprises an amino group, and a plurality of silver atoms. Particularly, the organic siloxane material has a meshed structure, and the plurality of silver atoms are bonded to the amino group and are well dispersed in the meshed structure.