Silver-Ion Antiviral Coating for Durable Door Handle Surfaces

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Solution Overview

Problem

Door handles in public places are frequently touched and contaminated with bacteria and viruses, posing a high risk of infection through hand-to-nose or hand-to-mouth contact.

Innovation Solution

A method involving the application of a primer and varnish coating layer containing silver ions and inorganic glass composition, with specific weight percentages, to create a durable antibacterial and antiviral coating on objects like door locks, enhancing adhesion and preventing atomization.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a conventional coating is applied to door handles, then the surface appearance is improved, but the coating lacks effective antibacterial and antiviral protection

Engineering Contradiction:

Improveantibacterial and antiviral protectionVSAvoidcoating application process

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent applies a composite coating system consisting of a primer layer containing silver ions and an inorganic glass composition (specifically a silicate-based antibacterial agent), followed by a varnish layer. This composite structure integrates multiple functional materials to achieve both antibacterial protection and durable surface finish, resolving the contradiction between reliability and ease of manufacture.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent specifies precise parameter ranges for the inorganic glass composition (containing SiO2, Na2O, CaO, Al2O3, and B2O3 in specific proportions) and silver ion content to optimize antibacterial activity. By controlling these parameters, the coating achieves effective germicidal properties while maintaining manufacturability through standardized formulation ranges.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If a silver ion-containing coating is applied to provide antibacterial activity, then the antibacterial effectiveness is improved, but the coating may atomize or detach from the surface

Engineering Contradiction:

Improveantibacterial activityVSAvoidcoating adhesion and atomization resistance

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The patent uses an inorganic glass composition (silicate-based antibacterial agent) as an intermediary material that bonds both the silver ions and the varnish coating to the substrate surface. This intermediary layer prevents atomization and detachment of the silver ion-containing coating by providing a stable matrix that anchors the silver ions while allowing the varnish to adhere properly, thus resolving the contradiction between antibacterial activity and coating stability.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Reliability

If a single-layer coating is applied, then the manufacturing process is simplified, but the coating lacks both adhesion promotion and antibacterial functionality

Engineering Contradiction:

Improvecoating adhesion and antibacterial functionVSAvoidcoating layer structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent divides the coating system into two distinct functional layers: a primer layer containing silver ions and inorganic glass composition for antibacterial activity and adhesion promotion, and a varnish layer for surface finish and protection. This segmentation allows each layer to perform its specific function optimally while maintaining overall system simplicity, resolving the contradiction between reliability and device complexity.

Inventive Principle:

Principle #1Segmentation

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 coating provides long-lasting antibacterial and antiviral protection, ensuring effective germ reduction and durable attachment to surfaces.

Implementation Method 1

spraying a primer material onto a surface of the untreated object using an electrostatic spray gun so as to from a primer coating layer

Methodology Applied

Scientific EffectElectrostatic spray: Electrostatic Deposition

Implementation Method 2

baking the primed object obtained in step (b) to dry the primer coating layer

Methodology Applied

Scientific EffectThermal drying: Heating

Implementation Method 3

spraying a varnish material onto a surface of the baked object obtained in step (c) using a hand spray gun so as to form a varnish coating layer

Methodology Applied

Scientific EffectSpray deposition: Fluid Spray

Implementation Method 4

baking the varnished object obtained in step (d) to dry the varnish coating layer

Methodology Applied

Scientific EffectThermal drying: Heating

Data Source

PatentUS12509908B2Method of making object including coating unit having antibacterial and antiviral activity and object made therefrom

Publication Date: 2025.12.30 FIBRE IND CO LTD

AI summary

A method of making an object including a coating unit having antibacterial and antiviral activity includes (a) providing an untreated object; (b) spraying a primer material onto a surface of the untreated object so as to form a primer coating layer, thereby obtaining a primed object; (c) baking the primed object obtained in step (b) to dry the primer coating layer, thereby obtaining a baked object; (d) spraying a varnish material onto a surface of the baked object obtained in step (c) so as to form a varnish coating layer on the primer coating layer, thereby obtaining a varnished object; and (e) baking the varnished object obtained in step (d) to dry the varnish coating layer, thereby forming a coating unit having the primer coating layer and the varnish coating layer on the surface of the object. An object including an untreated object and a coating unit is also provided.