Multi-Component Curable Composition for Waterproofing
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Solution Overview
Problem
Conventional waterproofing membrane coatings using polyisocyanate-based urethane materials face challenges due to toxicity and residual tackiness issues, which hinder environmental sustainability and construction efficiency.
Innovation Solution
A multi-component curable composition combining a polyoxyalkylene-based polymer with a specific epoxy resin curing agent, enhancing residual tackiness and mechanical properties without using polyisocyanate, thereby improving workability and tensile strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polyisocyanate-based urethane materials are used for waterproofing membrane coating, then the material provides good waterproofing performance, but the material exhibits high toxicity and significant adverse environmental effects
Solution Approach 1:
The patent changes the chemical composition parameters by replacing polyisocyanate with a multi-component curable composition containing polyol resin, epoxy resin, and silane-modified polymer. This substitution maintains waterproofing performance while eliminating the toxic effects of polyisocyanate, directly resolving the contradiction between reliability and environmental harm.
Solution Approach 2:
The patent employs a composite material system consisting of multiple components: polyol resin as base resin, epoxy resin for crosslinking, and silane-modified polymer for enhanced properties. This composite approach achieves both good waterproofing performance and environmental sustainability by combining materials with complementary properties while avoiding toxic substances.
2Object-affected harmful factors
If conventional curable compositions are used to replace polyisocyanate, then the material reduces toxicity, but the cured product exhibits residual tackiness after one day
Solution Approach 1:
The patent adjusts the curing mechanism by incorporating silane-modified polymer that undergoes condensation curing to form crosslinked structures. This chemical parameter change enables complete curing without residual tackiness while maintaining low toxicity, as the silane crosslinking proceeds to completion through moisture-cured or heat-cured mechanisms.
Solution Approach 2:
The silane-modified polymer acts as an intermediary that facilitates complete crosslinking in the cured product. The silane groups react with moisture or undergo condensation to form a dense crosslinked network, preventing residual tackiness while the base composition remains free of toxic polyisocyanates.
3Manufacturing precision
If multi-component curable composition with silane-modified polymer is used, then the cured product achieves improved residual tackiness, but the composition requires complex multi-component mixing
Solution Approach 1:
The patent segments the curable composition into distinct functional components: polyol resin (base), epoxy resin (crosslinker), and silane-modified polymer (performance enhancer). Each component can be separately formulated and stored, then mixed in controlled proportions to achieve the desired curing characteristics without residual tackiness.
Solution Approach 2:
The silane-modified polymer serves multiple functions simultaneously: it provides crosslinking capability, enhances mechanical properties, and ensures complete curing to eliminate residual tackiness. This multi-functionality reduces the need for additional separate additives, simplifying the overall composition despite its multi-component nature.
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 provides a cured product with improved residual tackiness after one day, enhanced tensile properties, and increased tear strength, facilitating faster construction and environmental sustainability by avoiding toxic polyisocyanates.
Implementation Method 1
a polyoxyalkylene-based polymer (A) having a reactive silicon group represented by general formula (1): —Si(R)3-a(X)a (1) where: each R independently represents a C1 to C20 hydrocarbon group or a triorganosiloxy group represented by —OSi(R′)3
Implementation Method 2
mixing a specific epoxy resin curing agent with respect to a multi-component type curable composition which contains a specific polyoxyalkylene-based polymer and a specific epoxy resin
Implementation Method 3
an agent A that contains a polyoxyalkylene-based polymer (A) having a reactive silicon group represented by general formula (1) and an epoxy resin curing agent (B) represented by general formula (2)
Data Source
AI summary
A multi-component type curable composition that is capable of providing a cured product having an improved residual tackiness after one day is provided. The multi-component type curable composition contains an agent A that contains a specific polyoxyalkylene-based polymer (A) having a reactive silicon group and a specific epoxy resin curing agent (B), and an agent B that contains an epoxy resin (C).