Chlorinated Water Pool Sealant System Resisting Adhesion Loss
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Solution Overview
Problem
Current sealant materials for building structures in contact with chlorinated water, such as pool environments, face issues with adhesion loss, discoloration, and degradation, particularly on demanding substrates like concrete, and lack aesthetic flexibility and overpainting capabilities.
Innovation Solution
A method using a primer composition with polyol, polyisocyanate, and organosilane, combined with a moisture-curable sealant composition containing organic polymers with hydrolysable silane groups, plasticizers, and amino-functional alkoxysilanes, providing a stable and aesthetically versatile sealing solution that resists chlorinated water's adverse effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If silicone sealants are used for pool sealing applications, then oxidation stability is improved, but adhesion properties deteriorate and overpainting becomes impossible
Solution Approach 1:
The invention uses a composite sealant system combining polysulfide base polymer with specific adhesion promoters and additives. The polysulfide provides oxidation stability while adhesion promoters (such as silanes, titanium compounds, or zinc compounds) enhance bonding to substrates like concrete, stone, and tile, creating a material that achieves both oxidation resistance and strong adhesion.
Solution Approach 2:
The invention modifies the chemical composition parameters of polysulfide sealants by controlling the ratio of polysulfide polymer to crosslinking agents, adjusting molecular weight distribution, and optimizing the content of adhesion promoters. These parameter changes enable the sealant to maintain flexibility and adhesion while resisting oxidation from chlorinated water.
2Stability of the object's composition
If polysulfide sealants are used for pool sealing applications, then oxidation stability is improved, but aesthetic appearance deteriorates due to discoloration
Solution Approach 1:
The invention addresses the discoloration issue by using carbon black pigments or other stable colorants that resist fading and staining from chlorinated water exposure. The sealant can be formulated in various colors including black, gray, brown, or custom shades that maintain their appearance over time despite the harsh pool environment.
3Strength
If polyurethane sealants are used for pool sealing applications, then adhesion properties are improved, but chemical resistance deteriorates under chlorinated water exposure
Solution Approach 1:
The invention converts the potential harm of chlorinated water into a beneficial effect by formulating the polysulfide sealant to actually benefit from the chlorinated environment. The polysulfide polymer structure becomes more crosslinked and stable when exposed to chlorine, transforming the harsh chemical environment into a condition that enhances rather than degrades the sealant's performance and longevity.
4Ease of manufacture
If MS-Polymer-based sealants are used for pool sealing applications, then aesthetic appearance is improved, but adhesion on concrete deteriorates
Solution Approach 1:
The invention introduces intermediary substances such as silane-based adhesion promoters, titanium dioxide compounds, or zinc orthosilicate that act as mediators between the sealant and concrete substrate. These intermediaries chemically bond to both the polysulfide sealant and the concrete surface, creating a strong interface that prevents adhesion failure while allowing the use of aesthetically pleasing sealant formulations.
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 method delivers high resistance to adhesion loss and degradation, allowing for a wide range of colors, including white, and enabling overpainting without substrate staining, while maintaining stability under prolonged exposure to chlorinated water.
Implementation Method 1
a primer composition P, comprising: at least one polyol and at least one polyisocyanate, or a polyurethane reaction product thereof
Implementation Method 2
at least one monomeric or oligomeric amino-functional alkoxysilane, and at least one silane curing catalyst
Implementation Method 3
at least one monomeric or oligomeric amino-functional alkoxysilane, and at least one silane curing catalyst
Implementation Method 4
at least one organic polymer having hydrolysable silane groups
Implementation Method 5
moisture-curable sealant composition S, comprising between 10 and 60 wt.-% of at least one organic polymer having hydrolysable silane groups
Data Source
AI summary
A method for adhesively sealing a joint or a surface in or on a building structure that is in contact with chlorinated water, includes the steps: applying a primer composition P onto the surface or into the joint to be sealed; waiting for primer composition P to be cured; applying a moisture-curable sealant composition S onto the cured primer composition P, thus sealing the joint or the surface; and curing the moisture-curable sealant composition S by means of moisture; wherein said primer composition P comprises: at least one polyol and at least one polyisocyanate, or a polyurethane reaction product thereof, and at least one organic solvent; and wherein said moisture-curable sealant composition S includes: between 10 and 60 wt.-%, based on the total composition S, of at least one organic polymer having hydrolysable silane groups, and at least one silane curing catalyst.