Two-Component Coating Composition for Rapid Curing and Weathering Stability
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Solution Overview
Problem
Sealing compounds based on silane-terminated polymers face challenges in achieving quick and reliable curing across varying layer thicknesses, regardless of ambient humidity, due to diffusion-controlled hardening processes and the adverse effects of plasticizers on weathering stability.
Innovation Solution
A 2-component coating composition comprising a polymeric compound with inorganic fillers, amino groups, and anti-aging agents, combined with a catalyst component including organic tin, titanium, or amine compounds to accelerate silane polycondensation, while limiting plasticizer content to less than 5% by weight to enhance curing speed and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If plasticizers are used in sealing compounds based on silane-terminated polymers, then ease of application and workability are improved, but weathering stability under UV and moisture exposure deteriorates
Solution Approach 1:
The patent removes plasticizers from the formulation of sealing compounds based on silane-terminated polymers. The invention explicitly states that plasticizers should not be used in these compounds because they adversely affect weathering stability under UV and moisture exposure, while still achieving workability through alternative means.
2Speed
If larger quantities of catalysts are used to accelerate silane polycondensation, then curing speed is improved, but storage stability deteriorates
Solution Approach 1:
The patent divides the catalyst system into two separate components: Component A contains the silane-terminated polymer and Component B contains the catalyst. This segmentation allows the catalyst to be added only at the time of application, accelerating curing speed while maintaining storage stability during transport and storage, as no catalyst is present in Component A during storage.
Solution Approach 2:
The patent prepares Component A with all necessary ingredients except the catalyst, and Component B with the catalyst separately. The catalyst is introduced at the time of application rather than being pre-mixed, allowing preliminary preparation of stable components while enabling rapid curing when components are combined.
3Reliability
If diffusion-controlled curing is used for silane-terminated polymers, then chemical bonding and adhesion are improved, but curing time and productivity deteriorate
Solution Approach 1:
The patent introduces a catalyst as an intermediary substance that mediates the silane polycondensation reaction. The catalyst provides an alternative pathway for the reaction that is not diffusion-controlled, significantly accelerating the curing process while maintaining the chemical bonding and adhesion properties achieved through silane polycondensation.
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 2-component system allows for rapid curing within 60-90 minutes, regardless of layer thickness, and demonstrates improved aging behavior and mechanical properties, with enhanced resistance to UV and moisture exposure.
Implementation Method 1
component B is at least a liquid catalyst selected from the group of B1) organic tin compounds, and/or B2) organic titanium compounds, and/or B3) amines, and/or B4) amidines, and/or B5) guanidines to accelerate silane polycondensation
Implementation Method 2
One-component sealants based on silane-terminated polymers cure through silane polycondensation under the influence of moisture from the ambient air or the substrate
Data Source
AI summary
A two-component coating composition for structural waterproofing comprising a component A and a component B, wherein component A comprises at least: A1) a polymeric compound of the formula Y-[OC=O-NH-CH2-Si-R1a-R2(3-a)]x, where Y is an x-valent polymer residue obtained by removal of the OH groups from a polyether polyol, and R1 is a methyl group, and R2 is a methoxy or ethoxy group, and a is equal to 0 or 1; A2) inorganic and/or organic fillers; A3) compounds with at least one primary and/or secondary and/or tertiary amino group and with at least one alkoxysilyl group; A4) compounds of the structural formula Rx-Si(OCH3)3, wherein Rx is a vinyl or phenyl group or an oligomerization product derived from these compounds; A5) aging inhibitors;and wherein component B comprises at least one liquid catalyst selected from the group consisting of B1) organic tin compounds, and/or B2) organic titanium compounds, and/or B3) amines, and/or B4) amidines, and/or B5) guanidines for accelerating the silane polycondensation.