Silane-Modified Primer Composition for Water-Resistant Concrete Adhesion
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Solution Overview
Problem
Curable compositions containing polyoxyalkylene-based polymers with hydrolyzable silyl groups face challenges in adhering to concrete and mortar, particularly in terms of water-resistant adhesiveness.
Innovation Solution
A primer composition comprising a polyoxyalkylene-based polymer with hydrolyzable silyl groups, a second polyoxyalkylene-based polymer with multiple terminal hydrolyzable silyl groups, and an amine compound with two hydrolyzable silyl groups, in specific proportions, to enhance adhesiveness and water-resistant adhesiveness to concrete and mortar.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a polyoxyalkylene-based polymer with hydrolyzable silyl group is used as a sealing material or adhesive agent, then it can adhere to a variety of base materials, but it is difficult to adhere to concrete, mortar, and other water-permeable materials
Solution Approach 1:
The patent introduces a primer composition as an intermediary layer between the polyoxyalkylene-based polymer and water-permeable substrates (concrete, mortar). The primer contains silane coupling agents and polyoxyalkylene polymers that form a bridge: the silane components chemically bond to the substrate through hydrolysis and condensation reactions, while the polyoxyalkylene components provide compatibility and adhesion to the main polymer, thereby resolving the adhesion problem to water-permeable materials
Solution Approach 2:
The primer composition is formulated as a composite material combining silane coupling agents (for chemical bonding to substrate) and polyoxyalkylene-based polymers (for adhesion compatibility). This composite structure enables the primer to simultaneously achieve strong bonding to concrete/mortar through silane hydrolysis-condensation and good adhesion to the polyoxyalkylene-based polymer, thus resolving the contradiction in adhesion performance
2Reliability
If a primer is applied to enhance adhesiveness to concrete and mortar, then adhesion is improved, but water-resistant adhesiveness remains insufficient
Solution Approach 1:
The patent modifies the chemical composition parameters of the primer by incorporating specific ratios of silane coupling agents and polyoxyalkylene-based polymers with controlled molecular weights and hydrolyzable silyl group contents. These parameter changes enable the primer to form a crosslinked siloxane network structure that provides both adhesion and water resistance, resolving the insufficiency in water-resistant adhesiveness
Solution Approach 2:
The primer composition is designed with local quality differentiation: the silane coupling agent components provide water-resistant chemical bonding to the substrate, while the polyoxyalkylene polymer components provide adhesion to the polyoxyalkylene-based polymer. This functional differentiation within the primer layer enables simultaneous achievement of adhesion and water-resistant adhesiveness
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 primer composition significantly improves adhesiveness and water-resistant adhesiveness between curable compositions and concrete or mortar, ensuring strong and durable bonding.
Implementation Method 1
An organic polymer having a hydrolyzable silyl group has properties of being crosslinked via a siloxane bond formed by a hydrolysis reaction of a hydrolyzable silyl group by moisture and the like at room temperature
Implementation Method 2
being crosslinked via a siloxane bond formed by a hydrolysis reaction of a hydrolyzable silyl group
Data Source
AI summary
An object is to provide a primer composition that contains a polyoxyalkylene-based polymer having a hydrolyzable silyl group and that allows a curable composition containing the polyoxyalkylene-based polymer to have favorable adhesiveness with respect to concrete, mortar, and the like. The object is attained by a primer composition which contains a polyoxyalkylene-based polymer (A) having a specific structure, a polyoxyalkylene-based polymer (B) having a specific structure and a number average molecular weight falling within a specific range, and an amine compound (C) having two hydrolyzable silyl groups and in which contained amounts of (A) through (C) satisfy specific ranges.