Alkali Metal Polyborate Silicate Coating Sag Resistance
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Solution Overview
Problem
Existing acoustical panels and gypsum wallboards face issues with sag resistance due to moisture, particularly when organic binders like starch are used, which can soften and weaken the structure, and inorganic binder compositions with high borate salt concentrations become non-transparent.
Innovation Solution
A coated building panel with a cured alkali metal polyborate silicate binder, formed from a mixture of alkali metal polyborate and alkali metal silicate dissolved in water, is applied to enhance sag resistance, maintaining transparency and stability even at high borate concentrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If organic binders like starch are used to provide structural adhesion, then the panel structure gains strength and durability, but the panel becomes susceptible to moisture causing softening and sagging
Solution Approach 1:
The patent transitions from organic binders to inorganic binders (borate salts and metal silicates), fundamentally changing the chemical parameters of the binding system. This parameter change enables the coating to maintain structural integrity while achieving moisture resistance, as inorganic materials do not soften when exposed to moisture like organic starch binders do.
Solution Approach 2:
The patent creates a composite inorganic binder system combining borate salts and metal silicates in specific ratios (1:4 to 4:1). This composite approach leverages the complementary properties of both materials to achieve optimal strength and moisture resistance, resolving the contradiction between structural adhesion and moisture resistance.
2Reliability
If borate salt concentration is raised to improve coating performance, then sag resistance improves, but the composition becomes non-transparent due to precipitation
Solution Approach 1:
The patent optimizes the concentration parameters of borate salts and metal silicates within specific ranges (1-10 wt% borate salt, 1-40 wt% metal silicate) to maintain transparency while achieving adequate sag resistance. It also controls pH parameters (8-11) and temperature parameters (20-100°C) to prevent precipitation, allowing high-performance coatings to remain transparent.
Solution Approach 2:
The composite system of borate salts and metal silicates works synergistically to enhance sag resistance while maintaining transparency. The metal silicate component helps stabilize the solution and prevent precipitation of borate compounds, allowing higher borate concentrations to be used without sacrificing transparency.
3Reliability
If inorganic binder is used to counter moisture problems, then moisture resistance improves, but the binder is water soluble which may cause handling issues
Solution Approach 1:
The patent controls the pH of the coating composition within the range of 8-11, which optimizes the solubility and stability characteristics of the inorganic binder. This parameter control allows the binder to remain sufficiently soluble for easy application while providing adequate handling stability and moisture resistance in the cured state.
Solution Approach 2:
The patent applies the inorganic binder coating before the panel is exposed to moisture or service conditions. The coating is applied in its soluble state for ease of handling and application, then cured in place to achieve the desired moisture resistance and structural properties, thus resolving the handling stability issue.
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 alkali metal polyborate silicate coating significantly improves sag resistance by up to 60% less sag compared to panels without alkali metal polyborate, while maintaining transparency and stability, as measured by ASTM C367M-09 standards.
Implementation Method 1
a cured binder comprising alkali metal polyborate silicate, and methods of making same. More particularly, the alkali metal polyborate silicate results from curing a mixture of an inorganic alkali metal polyborate and an inorganic alkali metal silicate dissolved in water
Implementation Method 2
the alkali metal polyborate silicate results from curing a mixture of an inorganic alkali metal polyborate and an inorganic alkali metal silicate dissolved in water
Data Source
AI summary
A coating composition for improving the sag resistance of a gypsum panel or a fibrous panel, the composition including 25 to 100 wt. % alkali metal polyborate silicate inorganic binder, based on the total weight of the dry coating. The inorganic binder includes alkali metal polyborate silicate resulting from combining alkali metal polyborate and alkali metal silicate. Further provided are fibrous panels having a backing side and an opposing facing side including a coating of the inorganic binder, and methods of preparing same. Further provided are gypsum panels having a backing side and an opposing facing side including a coating of the inorganic binder, and methods of preparing same.