Magnesium Oxychloride Board Composition for Lower Density and Fire Resistance
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Solution Overview
Problem
Current magnesium oxychloride (MOC) boards used in construction are heavy, costly, and suffer from issues such as high water absorption, mold growth, reduced fire resistance, and fastener corrosion, with traditional fillers like wood particles and EPS reducing performance.
Innovation Solution
A formulation using low-density fillers like expanded perlite and vermiculite, combined with phosphoric acid/phosphate salts and iron/aluminum salts, and geopolymer coatings, along with specific mixing techniques to create lightweight, fire-resistant, and corrosion-resistant MOC boards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If wood particles are used as filler material, then cost is reduced and flexibility is improved, but fire resistance is significantly reduced and mold growth is supported
Solution Approach 1:
The patent changes the chemical composition parameters by replacing organic wood particles with inorganic fillers (perlite, vermiculite, glass beads) that have different fire resistance properties. This parameter change eliminates the fire safety issue while maintaining cost-effectiveness through the use of abundant inorganic materials.
Solution Approach 2:
The patent creates a composite material system combining MOC cement with inorganic fillers (perlite, vermiculite, glass beads) and reinforcing fibers. This composite approach maintains the structural integrity and flexibility benefits of filled materials while eliminating the fire safety problems associated with organic wood particles.
2Weight of stationary object
If EPS beads are used as fillers, then density is reduced and cost is reduced, but fire performance is significantly reduced and physical strength is reduced
Solution Approach 1:
The patent changes the filler material parameters from organic EPS beads to inorganic materials (perlite, vermiculite, glass beads) that provide similar density reduction benefits but with superior fire resistance. These inorganic fillers maintain low density while being non-combustible.
Solution Approach 2:
The patent replaces EPS beads (which are cheap but have short fire resistance life) with inorganic fillers that provide comparable cost benefits but with indefinite fire resistance. The inorganic materials do not decompose or melt under fire conditions like EPS does.
3Object-affected harmful factors
If MOC cement is used, then fire retardancy is provided through endothermic reactions, but mechanical strength is lost when decomposed by fire
Solution Approach 1:
The patent creates a composite system where MOC cement provides fire retardancy through its endothermic decomposition reactions, while inorganic fillers (perlite, vermiculite) and reinforcing fibers (glass, basalt, steel) provide structural strength. The composite structure ensures that when MOC decomposes, the framework of fillers and fibers maintains mechanical integrity.
Solution Approach 2:
The patent applies different materials with different functions to different parts of the composite: MOC cement provides fire protection, inorganic fillers provide structural framework and strength, while fibers provide reinforcement. This local specialization of functions allows the material to maintain strength during fire exposure.
4Object-affected harmful factors
If current MOC board formulations are used, then fire retardant properties are achieved, but density is greater than 0.8 grams/cm3 making boards too heavy
Solution Approach 1:
The patent changes the density parameter by replacing dense traditional fillers with lightweight inorganic materials (perlite, vermiculite, glass beads). These materials have lower density while maintaining fire resistance, achieving density below 0.8 grams/cm3 without sacrificing fire safety.
Solution Approach 2:
The patent creates a composite formulation combining MOC cement with lightweight inorganic fillers (perlite, vermiculite, glass beads) and fibers. This composite structure reduces overall density while maintaining fire retardant properties through the MOC cement matrix and the non-combustible nature of the inorganic fillers.
5Strength
If high chloride content MOC cement is used, then strength is achieved, but fastener corrosion problems occur
Solution Approach 1:
The patent introduces an intermediary protective layer or modification to the MOC cement system that reduces chloride release. This could include surface treatments, encapsulation of chloride sources, or chemical modifications that prevent chloride migration to fasteners, thereby protecting against corrosion while maintaining the high strength benefits of MOC cement.
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 results in boards with improved strength, reduced density, and enhanced fire resistance, while minimizing water absorption and fastener corrosion, suitable for construction applications.
Implementation Method 1
MOC cement, also known as Sorel cement, has been used in many parts of the world. It is made by lightly burned magnesium oxide, magnesium chloride, water, and additives.
Implementation Method 2
A formulation using low-density fillers like expanded perlite and vermiculite, combined with phosphoric acid/phosphate salts and iron/aluminum salts
Implementation Method 3
A formulation using low-density fillers like expanded perlite and vermiculite
Implementation Method 4
combined with phosphoric acid/phosphate salts and iron/aluminum salts
Implementation Method 5
Factors limiting the wide spread use of the MOC boards include high cost, relatively high density, and the perception of poor handling by the construction industry
Data Source
AI summary
This application relates to making magnesium oxychloride boards. A magnesium oxychloride slurry is mixed by directing magnesium chloride, magnesium oxide, at least one phosphate, at least one inorganic salt, and water into a mixer and mixing these ingredients together to form a slurry. At least one filler is then mixed with the slurry. The slurry is directed to a mold. The mold is formed with the slurry to form a magnesium oxychloride board. The magnesium oxychloride board is then cured.