Colloidal Silica Coated Building Board for Algae Control
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Solution Overview
Problem
External wall materials of buildings are prone to biotic contamination from algae and fungi, particularly on shaded, humid areas, leading to discoloration, staining, and the need for frequent recoating or washing, with existing anti-algal and antifungal agents providing temporary and incomplete protection.
Innovation Solution
A building board with a coat containing colloidal silica as a main component and an antimicrobial composite material, where the antimicrobial composite material is fixed to the surface via hydrogen bonding with colloidal silica, providing stable and efficient control over algae and fungi growth, while also imparting a superhydrophilic property for self-cleaning and stain-proofing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If anti-algal or antifungal agents are sprayed to delay reoccurrence of biotic contamination, then the anti-algal and antifungal effects are temporarily improved, but the agents are washed away by rain and the protection is not lasting
Solution Approach 1:
The antimicrobial composite material is incorporated into the coating formulation in advance, before application to the building board surface. This preliminary incorporation ensures that the antimicrobial agents are permanently integrated into the coating matrix, providing lasting protection that is not washed away by rain, thereby resolving the contradiction between temporary effectiveness and duration of protection
Solution Approach 2:
The invention uses a composite coating material that combines antimicrobial composite material with coating resin and colloidal silica. This composite formulation ensures that the antimicrobial agents are embedded within the coating matrix, providing both the anti-algal/antifungal effects and long-lasting durability, thus resolving the contradiction between reliability of protection and duration of action
2Adaptability or versatility
If many kinds of agents are used to cover all kinds of algae and fungi, then the coverage of antimicrobial effectiveness is improved, but the cost and complexity increase
Solution Approach 1:
The antimicrobial composite material used in the invention has broad-spectrum activity that effectively covers multiple kinds of algae and fungi. This universal antimicrobial agent provides multi-functional protection against various biotic contaminants, eliminating the need to use many different agents, thus resolving the contradiction between adaptability and complexity
3Reliability
If an antimicrobial composite material is added to paint to provide anti-algal effect, then the anti-algal function is improved, but the resin hinders the fixation of antimicrobial material to the surface
Solution Approach 1:
Colloidal silica is introduced as an intermediary substance between the antimicrobial composite material and the coating resin. The colloidal silica particles have high surface area and act as a bridge, allowing the antimicrobial material to be firmly fixed to the surface while the resin provides the coating matrix. This intermediary mechanism resolves the contradiction by enabling stable fixation without hindrance from the resin
Solution Approach 2:
The colloidal silica provides a porous structure with high surface area that facilitates the fixation of antimicrobial composite material. The porous nature of colloidal silica allows the antimicrobial agents to be firmly anchored while maintaining compatibility with the coating resin, thus resolving the contradiction between anti-algal function and stability of composition
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 solution effectively controls algae and fungi growth with a small amount of antimicrobial composite material, providing lasting protection and maintaining the surface's transparency and design integrity, while also ensuring efficient stain removal and prevention.
Implementation Method 1
the antimicrobial composite material is fixed to fine convexoconcaves on the surface of the colloidal silica without being hindered by the resin and the colloidal silica is fixed to the coat on the substrate via hydrogen bonding
Implementation Method 2
super hydrophilic property is imparted to the surface which is firmly covered with silica fine particles, and upon contacting with water, self-cleaning function is exhibited, wherein the silica fine particles absorb the water and stains adhered to the surface float and are washed away together with the water
Data Source
AI summary
Provided is a functional building board having an antimicrobial function, which retains anti-algal and antifungal agents for a long period of time in a coat on an external wall material by using several kinds of antimicrobial composite materials, and is provided with stain-proofing function to wash away stains on the external wall material, and in which the design is not largely restricted by the color of the anti-algal or antifungal paint or by the state of the coat and the design is not influenced by the coating step in the final step.The building board according to the present invention has a coat formed on the surface, and is characterized in that antimicrobial composite materials are included on the surface of the coat and a coat layer containing colloidal silica as a main component is formed, said antimicrobial composite materials being characterized in that they control generation of algae and fungi and said building board being a fiber reinforced cement board.