Curable Composition for Concrete Adhesion
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Solution Overview
Problem
Existing curable compositions struggle to achieve improved water-resistant adhesion to concrete without a primer and have high water absorption rates in their cured products.
Innovation Solution
A curable composition containing a hydrolyzable silyl group-containing polyoxyalkylene polymer, silica, a silane compound with an alkyl group of four or more carbon atoms, and a compound resulting from partial condensation of silyl groups of an aminosilane, optionally including an epoxysilane.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a curable composition contains a hydrolyzable silyl group-containing polyoxyalkylene polymer, silica, and a silane compound, then the composition can achieve adhesion to concrete, but the water-resistant adhesion is insufficient and water absorption rate is high without a primer
Solution Approach 1:
The patent changes the chemical parameters of the silane compound by specifying an alkyl group with 4 or more carbon atoms (long-chain alkyl group), which fundamentally alters the interaction mechanism with concrete. This parameter change enables the composition to achieve superior water-resistant adhesion without requiring a primer, resolving the contradiction between adhesion performance and ease of application.
Solution Approach 2:
The patent creates a composite system combining polyoxyalkylene polymer, silica, and long-chain alkylsilane compound. This composite material structure enables synergistic effects where the long-chain alkyl group provides hydrophobicity and chemical bonding to concrete, while the polyoxyalkylene polymer provides adhesion and flexibility, achieving both water resistance and strong adhesion without primer.
2Ease of operation
If the curable composition uses conventional silane compounds, then the composition is easy to handle, but the cured product exhibits high water absorption rate
Solution Approach 1:
The patent modifies the physical and chemical parameters of the silane compound by introducing a long-chain alkyl group (4 or more carbon atoms). This parameter change creates a hydrophobic effect that significantly reduces water absorption while maintaining the ease of handling characteristics of conventional silane compounds. The long alkyl chain provides steric hindrance to water molecules, preventing penetration into the cured product.
3Productivity
If the curable composition is applied without primer to achieve faster construction, then productivity increases, but water-resistant adhesion performance deteriorates
Solution Approach 1:
The patent enables the composition to be self-sufficient by incorporating all necessary functional components (polyoxyalkylene polymer, silica, and long-chain alkylsilane) within a single composition. This self-service capability allows the composition to achieve both adhesion and water resistance without requiring separate primer applications, thereby increasing construction productivity while maintaining reliability.
Solution Approach 2:
The patent creates a multi-functional composition where the long-chain alkylsilane compound simultaneously provides adhesion promotion, water resistance, and chemical bonding capabilities. This universal functionality eliminates the need for separate primer and water repellent coatings, allowing single-application construction that achieves both productivity and performance goals.
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 exhibits enhanced water-resistant adhesion to concrete without a primer and produces a cured product with a low water absorption rate.
Implementation Method 1
a curable composition containing a hydrolyzable silyl group-containing polyoxyalkylene polymer (A)
Implementation Method 2
a compound (D) resulting from partial condensation of silyl groups of an aminosilane
Implementation Method 3
a silane compound (C) containing an alkyl group having four or more carbon atoms
Implementation Method 4
a compound (D) resulting from partial condensation of silyl groups of an aminosilane alone or partial condensation of the aminosilane with an alkoxysilane compound other than aminosilanes
Data Source
AI summary
A curable composition contains a hydrolyzable silyl group-containing polyoxyalkylene polymer (A), silica (B), a silane compound (C) containing an alkyl group having four or more carbon atoms, and a compound (D) resulting from partial condensation of silyl groups of an aminosilane alone or partial condensation of the aminosilane with an alkoxysilane compound other than aminosilanes.