Stain-Proofing Agent for Building Boards Using Metal Compounds
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Solution Overview
Problem
Existing stain-proofing agents for building boards face challenges in achieving high hydrophilicity and adhesion without increasing silica particle concentration, which can lead to expensive formulations and uneven application, and methods to enhance adhesion, such as flame oxidation or heating, can damage the board's surface and are energy-intensive.
Innovation Solution
A stain-proofing agent comprising silica fine particles, an aqueous solvent, and a stain-proofing improver like an alkali metal compound, alkaline earth metal compound, phosphorus compound, or clay mineral, applied to the building board's surface in an unhardened state or after roughening treatment, enhancing adhesion and durability without increasing silica particle concentration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the concentration of silica fine particles is increased to obtain high hydrophilicity, then the stain-proofing effect is improved, but the cost increases and uneven application occurs causing whitish pools
Solution Approach 1:
The patent combines silica fine particles with specific metal compounds (alkali metals, alkaline earth metals, or aluminum) to form a composite stain-proofing agent. This composite approach enhances the hydrophilic effect and stain-proofing performance without requiring increased silica concentration, thereby avoiding cost increases and application uniformity issues.
Solution Approach 2:
The patent introduces metal compounds that modify the surface properties of silica particles, changing the chemical parameters of the stain-proofing agent. This parameter change allows achieving high hydrophilicity through chemical modification rather than increasing particle concentration, solving both the cost and application uniformity problems.
2Strength
If flame oxidation or oxidizing agents are used to enhance adhesion between stain-proofing film and coat, then adhesion is improved, but the coat deteriorates causing discoloration, loss of glaze, peeling, cracks and pinholes
Solution Approach 1:
The patent uses metal compounds as intermediaries that form chemical bridges between the stain-proofing film and the coat. These intermediaries enhance adhesion through chemical bonding without requiring aggressive flame oxidation or oxidizing agents, thus preventing coat deterioration while maintaining strong adhesion.
Solution Approach 2:
The patent replaces the mechanical/thermal oxidation method (flame treatment) with a chemical substitution approach using metal compounds. This substitution achieves the same adhesion enhancement goal without the harmful thermal and chemical effects that cause coat deterioration.
3Strength
If the surface of the coat is heated to 60°C or more to enhance adhesion, then adhesion is improved, but energy consumption increases and temperature control becomes difficult
Solution Approach 1:
The patent replaces the thermal method (heating to 60°C or more) with a chemical method using metal compounds. This chemical approach achieves adhesion enhancement at ambient or lower temperatures, eliminating the need for energy-intensive heating processes and simplifying temperature control.
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 provides enhanced stain-proofing effects with improved adhesion and durability, preventing stain removal without damaging the board's surface or increasing energy consumption.
Implementation Method 1
The above-described silica fine particles give super hydrophilicity to the treated surface of a substrate owing to the presence of silanol groups on the surface of the particles.
Implementation Method 2
Since the vicinal silanol groups are mutually hydrogen-bonded, the concentration of free silanol group (i.e. single silanol group) which participates in hydrophilicity is not so high.
Data Source
AI summary
An object of the present invention is to provide a durable excellent stain-proofing property to the surface of a coating formed on a substrate surface of a building board without deteriorating the surface of the coating. The present invention also, provides a stain-proofing agent containing silica fine particles, an aqueous solvent and, as a stain-proofing improver, an alkali metal compound and/or an alkaline earth metal compound and/or a phosphorus compound and/or a clay mineral. The present invention also provides a building board having an excellent stain-proofing property prepared by applying a coating composition onto the surface of a substrate to form a coat, and then applying a stain-proofing agent onto the coat while the coat is in an unhardened state or applying a stain-proofing agent onto the coat after subjecting the coat to a roughening treatment to enhance the adhesion of the stain-proofing layer to the coat.