Mildewproof Gypsum Board Core with Poorly Water-Soluble Anti-Mold Agent
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Solution Overview
Problem
Conventional gypsum boards face challenges in maintaining long-term mold resistance, especially in humid or water-exposed environments, as anti-mold agents applied to board paper or cores are easily washed away, and water-soluble agents dissolve with gypsum when splashed with water.
Innovation Solution
Incorporating a poorly water-soluble anti-mold agent into the gypsum core and board paper, combined with a silicone-based waterproofing agent, ensures the anti-mold agent remains effective for a longer period by preventing dissolution, even when exposed to water.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a water-soluble anti-mold agent is used in the gypsum core, then the anti-mold agent disperses evenly throughout the core, but the anti-mold agent dissolves when water splashes onto the board, reducing long-term effectiveness
Solution Approach 1:
The patent changes the solubility parameter of the anti-mold agent from water-soluble to poorly water-soluble. This allows the agent to remain in the core without dissolving when exposed to water, while still achieving sufficient dispersion through the use of a dispersant and mixing process. The parameter change resolves the contradiction by prioritizing durability over ease of dispersion, as the dispersant compensates for the reduced solubility.
Solution Approach 2:
The patent introduces a dispersant as an intermediary substance that facilitates the even distribution of the poorly water-soluble anti-mold agent throughout the gypsum core. The dispersant acts as a mediator between the hydrophobic anti-mold agent and the aqueous gypsum slurry, enabling uniform dispersion without requiring the anti-mold agent to be water-soluble. This resolves the contradiction by providing a mechanism for dispersion that does not depend on the solubility of the active anti-mold component.
2Ease of operation
If an anti-mold agent is applied to the board paper surface, then mold resistance is provided, but water splashed onto the surface washes away the anti-mold agent, reducing long-term protection
Solution Approach 1:
The patent extracts the anti-mold agent from the board paper surface and relocates it to the gypsum core. By embedding the agent within the core material, it becomes protected from water splash and mechanical removal. This extraction resolves the contradiction by sacrificing the ease of surface application for the benefit of long-term durability, as the core-embedded agent cannot be washed away like surface-applied agents.
Solution Approach 2:
The patent nests the anti-mold agent within the gypsum core structure, creating a hierarchical arrangement where the agent is embedded inside the matrix of gypsum, water, and foam. This nesting protects the anti-mold agent from external water exposure while maintaining its functional presence throughout the board. The nested structure resolves the contradiction by providing both protection (durability) and distribution (effectiveness) simultaneously.
3Reliability
If the amount of anti-mold agent is increased to maintain effectiveness, then mold resistance is improved, but the cost and complexity of the formulation increases
Solution Approach 1:
The patent changes the solubility parameter of the anti-mold agent to poorly water-soluble, which prevents dissolution and loss when exposed to water. This parameter change allows for lower dosages to achieve the same or better long-term effectiveness compared to water-soluble agents that would dissolve and wash away. The reduced dosage simplifies the formulation and reduces cost while maintaining or improving reliability.
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 use of poorly water-soluble anti-mold agents and waterproofing agents in the core and board paper significantly extends the mold resistance of gypsum boards, reducing the need for higher additive amounts and maintaining effectiveness against various mold species for an extended duration.
Implementation Method 1
gypsum into which a water-soluble anti-mold agent has been mixed, the water-soluble anti-mold agent gradually dissolves in water together with the gypsum where water continuously splashes onto the gypsum board
Implementation Method 2
a silicone-based waterproofing agent, ensures the anti-mold agent remains effective for a longer period by preventing dissolution, even when exposed to water
Data Source
AI summary
A gypsum board is installed whose anti-mold property lasts for a long period of time even in the case of using the gypsum board in a location where condensation occurs or which is likely to be splashed with water, such as the inside of an elevator shaft. In the gypsum board, a gypsum core contains a poorly water-soluble anti-mold agent and a waterproofing agent, and gypsum board paper containing a poorly water-soluble anti-mold agent is further used.