Antibacterial Hard Coating via Silver Nanoparticle Sol
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Solution Overview
Problem
Existing hard coating compositions lack long-lasting anti-static functions, sufficient surface hardness, and effective anti-fouling properties, and often produce pollutants, failing to meet the requirements of modern display devices and other applications.
Innovation Solution
A hard coating composition comprising a conductive filler, a binder with a polymerizable compound, silver nanoparticles with an insulating material coating, and a photopolymerization initiator, which provides superior anti-static, antibacterial, and anti-fouling properties while maintaining stability and preventing pollutant discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional hard coating compositions are used to improve scratch resistance, then surface hardness is improved, but anti-static functions are not achieved or last only a short period
Solution Approach 1:
The patent uses a composite coating system combining inorganic filler particles (for hardness) with conductive polymer particles (for anti-static function). The conductive polymer particles are grafted onto the inorganic filler surface, creating a composite structure where both hardness and long-lasting anti-static properties are achieved simultaneously through the synergistic combination of different material types.
Solution Approach 2:
The patent modifies the surface properties of inorganic filler particles by controlling the grafting degree of conductive polymer particles. By adjusting parameters such as polymerization conditions and filler surface treatment, the coating achieves optimal balance between surface hardness and prolonged anti-static functionality, transforming the temporary anti-static effect of conventional coatings into a permanent property.
2Strength
If inorganic filler powder is added to increase surface hardness, then scratch resistance is improved, but the coating lacks anti-fouling properties and produces pollutants
Solution Approach 1:
The patent applies local quality modification by coating the surface of inorganic filler particles with conductive polymer particles. This creates a core-shell structure where the inorganic core provides hardness while the organic polymer shell provides anti-fouling properties and eliminates pollutant discharge. The local replacement of inorganic material with organic material at the particle surface resolves the contradiction between hardness and environmental compatibility.
3Reliability
If conductive materials are simply added to hard coating compositions to achieve anti-static functions, then anti-static properties are improved, but the anti-static function does not last long
Solution Approach 1:
The patent performs preliminary action by grafting conductive polymer particles onto inorganic filler surfaces before coating application. This pre-establishes the anti-static function within the coating matrix, ensuring that conductive pathways are formed during the coating curing process rather than being added as separate components afterward. The preliminary integration of conductive materials ensures long-lasting anti-static properties.
Solution Approach 2:
The patent creates a composite system where conductive polymer particles are grafted onto inorganic filler surfaces, forming a core-shell structure. The inorganic core provides structural stability while the conductive polymer shell ensures prolonged anti-static functionality. This composite approach prevents the leaching or degradation of conductive materials that occurs in conventional mixtures, thereby extending the anti-static function duration.
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 composition achieves long-lasting anti-static functions, high surface hardness, and effective anti-fouling properties, enhancing the durability and cleanliness of coated surfaces without producing pollutants, making it suitable for various display devices and commercial applications.
Implementation Method 1
a binder with a polymerizable compound and a photopolymerization initiator
Implementation Method 2
a conductive filler... a plurality of silver nanoparticles dispersed in the composition... provides superior anti-static properties
Data Source
AI summary
A hard coating composition that can be coated on a transparent plastic substrate is disclosed. The hard coating composition includes (a) a silver nanoparticle sol, (b) a conductive filler, (c) a photocurable resin, (d) a photopolymerization initiator, and (e) an organic solvent. The composition has a viscosity of about 5 to 100 cps. The silver nanoparticle sol includes a plurality of silver nanoparticles. The plurality of silver nanoparticles has a diameter between about 1 nm and about 10 nm.