Silyl-Terminated Polymer Waterproofing Paste Adhesion
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Solution Overview
Problem
Conventional waterproofing compositions exhibit poor adhesion to wet and dry concrete, especially after extended water immersion and in low temperature environments, leading to inadequate performance in forming effective membranes and air barriers.
Innovation Solution
A non-aqueous, moisture-cured waterproofing paste composition comprising silyl-terminated reactive polymer resins and adhesion promoters, including hydrophobic diaminofunctional silane, which provides improved adhesion and resistance to water absorption, with a slump of 0-20 mm prior to curing and peel adhesion between 0.6 N/mm and 2.0 N/mm to concrete surfaces, even after water immersion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional waterproofing compositions are used, then the composition can be applied to form membranes, but the adhesion to concrete surfaces deteriorates after extended water immersion and in low temperature environments
Solution Approach 1:
The patent changes the chemical composition parameters by incorporating silyl-terminated polymer resins and specific adhesion promoters (silane-modified polymers, aluminum hydroxide, zinc oxide) to fundamentally alter the adhesion mechanism. This chemical parameter change enables the composition to maintain reliable adhesion to concrete surfaces even after extended water immersion and in low temperature environments, resolving the contradiction between initial adhesion and long-term durability.
Solution Approach 2:
The patent creates a composite waterproofing composition by combining multiple components: silyl-terminated polymer resins, adhesion promoters (including silane-modified polymers and inorganic fillers like aluminum hydroxide and zinc oxide), and other additives. This composite material approach provides both immediate adhesion and long-term durability by leveraging the complementary properties of different materials within the composition.
2Ease of operation
If the composition is made spreadable for easy application, then ease of operation improves, but water absorption increases reducing waterproofing effectiveness
Solution Approach 1:
The patent adjusts the rheological parameters of the composition to achieve optimal spreadability while maintaining low water absorption. The specific combination of silyl-terminated polymer resins and adhesion promoters creates a composition that is easily applicable yet resists water absorption, resolving the contradiction between ease of operation and waterproofing reliability.
3Productivity
If curing time is reduced for fast construction, then productivity improves, but adhesion strength may be compromised
Solution Approach 1:
The patent modifies the curing chemistry by incorporating aluminum hydroxide and zinc oxide alongside the silyl-terminated polymer resins and adhesion promoters. This chemical parameter change enables fast curing at construction temperatures while simultaneously ensuring strong peel adhesion, resolving the contradiction between productivity and bond strength.
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 composition achieves enhanced adhesion to concrete surfaces, low water absorption, and fast curing at low temperatures, maintaining bond strength and resistance to plasticizer migration, thereby improving the durability and effectiveness of waterproofing membranes and air barriers.
Implementation Method 1
a first silyl-terminated reactive polymer resin; a second silyl-terminated reactive polymer resin
Implementation Method 2
non-aqueous, moisture-cured waterproofing paste composition
Implementation Method 3
a first adhesion promoter of the plurality of adhesion promoters comprises a hydrophobic diaminofunctional silane
Implementation Method 4
non-aqueous, moisture-cured waterproofing paste composition... water absorption of about 15% or less after about 40 days of water immersion
Data Source
AI summary
A paste composition, method of use, and building product containing such composition. The composition comprises at least one (preferably two) silyl-terminated polymer resin and a plurality of adhesion promoters. In preferred embodiments, the composition has a paste consistency. In preferred embodiments the paste has a slump between 0 and 20 mm, more preferably a slump between 0 and 10 mm, and most preferably a slump between 0 and 5 mm, and a low water absorption after water immersion. In further exemplary embodiments, the composition further has good bond to dry/damp concrete and other substrates, with and without water immersion.