Silane Polymer Composition High Filler Hardness
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Solution Overview
Problem
Moisture-curing compositions based on silane-functional polymers face challenges in achieving high hardness while maintaining application properties, particularly when high filler content increases viscosity, making manual application difficult and costly.
Innovation Solution
A moisture-curing composition comprising at least one silane-functional polymer, a catalyst for crosslinking, and ≥65% by weight filler, specifically using organotitanate or amidine as catalysts and triethoxysilane groups to achieve ≥60 Shore A hardness without releasing methanol during curing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the filler content is increased to achieve high hardness, then the hardness of the cured composition is improved, but the viscosity increases making application difficult
Solution Approach 1:
The patent changes the chemical parameters of the system by selecting specific catalyst types (organotitanates or amidines) and controlling the water content at ≤0.5%, which modifies the curing kinetics and final network structure to achieve high hardness with reduced viscosity penalty
Solution Approach 2:
The patent uses composite fillers consisting of at least two different inorganic fillers with complementary properties, where one filler provides hardness and the other maintains rheological properties, allowing high overall filler content (≥65 wt.%) without excessive viscosity increase
2Strength
If the crosslinking density is increased to achieve high hardness, then the hardness is improved, but the formulation complexity and cost increase
Solution Approach 1:
The patent achieves high crosslinking density through parameter optimization rather than formulation complexity: using specific catalysts (organotitanates or amidines) at controlled concentrations (0.01-0.15% and 0.05-0.1% respectively) and limiting water content to ≤0.5%, which promotes efficient crosslinking without requiring multiple polymer components
Solution Approach 2:
The patent extracts and eliminates methanol-releasing components from the formulation, using only silane-functional polymers with triethoxysilane groups that cure without releasing methanol, simplifying the formulation while maintaining high hardness through efficient crosslinking
3Ease of manufacture
If the filler content is increased to optimize product cost, then the cost is reduced, but the composition cannot be applied due to increased viscosity
Solution Approach 1:
The patent uses composite filler systems combining at least two different inorganic fillers (such as calcium carbonate and silica, or various grades of fillers) where the synergistic interaction between filler types maintains better rheological properties and lower viscosity compared to using a single filler type at equivalent total loading
Solution Approach 2:
The patent optimizes the particle size distribution and surface properties of the filler components, using fillers with complementary size ranges and surface characteristics that prevent excessive aggregation and maintain flowability even at ≥65 wt.% total filler content
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 excellent hardness and processability with high filler content, reducing costs and maintaining application ease, suitable for applications like parquet adhesives and coatings.
Implementation Method 1
b) at least one catalyst for the crosslinking of silane-functional polymers
Implementation Method 2
the composition does not contain any components which release methanol during curing
Data Source
AI summary
The present invention relates to a moisture-cure composition comprising: a) at least one silane functional polymer P; b) at least one catalyst for cross-linking silane functional polymers; and c) at least 65% w/w of at least one filler, wherein the composition in the fully cured state has a Shore A hardness of > 60, determined in accordance with DIN 53505, and prior to curing has an extrusion pressure of < 1000 N.