Silane-Terminated Polymer Coating for Rapid Moisture Curing
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Solution Overview
Problem
Conventional sealing materials for building surfaces, particularly roofs, face issues such as slow drying at low temperatures leading to weak points and bubble formation, high viscosity requiring solvents or plasticizers, and the use of toxic isocyanate compounds, which are environmentally harmful and difficult to apply.
Innovation Solution
A one-component, moisture-curing coating composition using silane-terminated polymers with specific end groups and reactive plasticizers, eliminating the need for solvents and metal catalysts, and allowing for easy application without tackiness, while maintaining mechanical properties and hydrophobicity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If water-based coating materials are used, then environmental friendliness is improved, but drying speed deteriorates especially below 15°C
Solution Approach 1:
The patent changes the chemical mechanism from physical evaporation to chemical crosslinking reaction. The coating composition uses silane-terminated polymers that undergo moisture-curing crosslinking, transforming the drying process from temperature-dependent evaporation to a chemical reaction that proceeds effectively at lower temperatures, thus resolving the contradiction between environmental friendliness and drying speed.
Solution Approach 2:
The patent replaces the physical drying mechanism (evaporation) with a chemical crosslinking mechanism. Instead of relying on thermal energy to evaporate water, the system uses moisture-triggered silane crosslinking reactions to form the cured film, substituting a chemical process for a physical one and enabling effective curing at lower temperatures.
2Productivity
If drying occurs quickly above 25°C, then productivity is improved, but coating quality deteriorates due to water inclusions and blistering
Solution Approach 1:
The patent replaces rapid physical evaporation with controlled chemical crosslinking. The silane crosslinking reaction proceeds at a controlled rate regardless of temperature, avoiding the rapid surface sealing that traps water and causes blistering. This chemical mechanism maintains coating quality while achieving acceptable curing speeds.
Solution Approach 2:
The coating composition contains its own curing agent (moisture from air or added water) and catalyst system, allowing it to self-regulate the curing process. The crosslinking reaction proceeds autonomously without requiring external heating or controlled drying conditions, preventing water entrapment while maintaining consistent cure quality.
3Reliability
If silane-curing prepolymers are used, then sealing functionality is improved, but viscosity increases requiring solvents or plasticizers
Solution Approach 1:
The patent creates a composite coating system combining silane-terminated polymers with reactive plasticizers and catalysts. This composite formulation achieves low viscosity and good sealability simultaneously by integrating multiple functional components that work together: the silane polymer provides crosslinking capability, the reactive plasticizer maintains fluidity, and the catalyst enables curing without additional solvents.
Solution Approach 2:
The patent changes the molecular structure parameters by using silane-terminated polymers with specific end groups that can crosslink. This structural modification allows the material to achieve both low viscosity in the uncured state (for easy application) and high strength in the cured state (for good sealing), resolving the contradiction between applicability and functionality.
4Reliability
If MS polymer-based formulations are used, then sealability is improved, but residual tackiness increases leading to rapid soiling
Solution Approach 1:
The patent changes the crosslinking chemistry from conventional MS polymer systems to silane-based crosslinking with specific end groups. This parameter change in the chemical mechanism produces a fully crosslinked network that eliminates residual tackiness while maintaining excellent sealability, preventing rapid soiling accumulation.
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 coating composition achieves rapid curing, low viscosity for easy application, and forms tack-free, hydrophobic, and mechanically stable films without the use of solvents or toxic compounds, enhancing weathering stability and paintability.
Implementation Method 1
a moisture-curing coating composition containing a silane-terminated polymer
Implementation Method 2
moisture-curing coating composition containing a silane-terminated polymer with end groups of the general formula (I) -A-Si(OR 1
Implementation Method 3
Binary-component moisture-curing coating compositions based on MS polymers release foul-smelling or even harmful decomposition products
Data Source
AI summary
The invention relates to a moisture-curing coating composition (C) containing A) 100 parts by weight of silane-terminated polymer (P) having end groups of the general formula (I) -A-Si(OR1)xR23-x, B) from 7 to 200 parts by weight of reactive plasticizers (RP) of the general formula (II) R3-Si(OR4)yR53-y, C) from 0 to 400 parts by weight of filler (F) and D) from 0.1 to 20 parts by weight of curing catalyst (K), where A is a linear or branched alkylene group having from 1 to 10 carbon atoms, R1, R4 are each a linear or branched unsubstituted or halogen-substituted alkyl group having from 1 to 10 carbon atoms, R2, R5 are each a linear or branched unsubstituted or halogen-substituted alkyl group having from 1 to 5 carbon atoms, R3 is an aryl group or a linear, branched or cyclic alkyl group or alkenyl group having from 6 to 40 carbon atoms, in which individual carbon atoms can be replaced by organic radicals, where, if R3 is a linear, branched or cyclic alkyl group or alkenyl group, the carbon chain may be interrupted by oxygen atoms, and x, y are each 1, 2 or 3, and also a method of sealing surfaces.