Curable Composition for Waterproof Coating with Moisture Permeability
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Solution Overview
Problem
Conventional liquid waterproof coating materials lack sufficient moisture permeability and are not effective at low temperatures, leading to issues such as reduced workability and increased risk of cracking due to low elasticity, which compromises their waterproofing performance over time.
Innovation Solution
A curable composition incorporating reactive silyl group-containing organic polymers with oxyethylene units is developed, enhancing water vapor permeability and maintaining waterproofness, even at low temperatures, by forming a siloxane bond through hydrolysis, which allows for improved elasticity and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a waterproof sheet is used to provide waterproofness, then water protection is improved, but moisture permeability deteriorates
Solution Approach 1:
The invention changes the physical and chemical parameters of the waterproofing material by using a liquid coating composition that forms a flexible membrane with specific porosity and elasticity characteristics, allowing moisture vapor to pass through while blocking liquid water
Solution Approach 2:
The invention uses a composite coating system comprising organic polymers with reactive silyl groups that form a cross-linked network structure, combining waterproofing, moisture permeability, and flexibility properties in a single integrated material
2Reliability
If adhesive-backed waterproof tapes are used to seal openings, then waterproofness is improved, but moisture permeability deteriorates
Solution Approach 1:
The invention merges the sealing and waterproofing functions into a single liquid coating application that can be continuously applied around openings and joints, eliminating the need for separate adhesive tapes and maintaining moisture permeability throughout the sealed areas
3Ease of operation
If latex polymer is used in liquid waterproof coating material, then ease of application is improved, but workability at low temperature deteriorates
Solution Approach 1:
The invention changes the chemical composition parameters by replacing latex polymer with organic polymers containing reactive silyl groups, which maintain low-temperature workability and flexibility while preserving ease of application through liquid formulation
4Ease of operation
If latex polymer coating film is used, then ease of application is improved, but elasticity deteriorates
Solution Approach 1:
The invention creates a composite cross-linked polymer network through reactive silyl group-containing organic polymers that provide high elasticity and flexibility, enabling the coating film to accommodate substrate movement without cracking while maintaining ease of application in liquid form
5Stability of the object's composition
If conventional liquid waterproof coating material is used, then continuous coating formation is improved, but moisture permeability deteriorates
Solution Approach 1:
The invention develops a composite coating material where organic polymers with reactive silyl groups form a continuous cross-linked network that inherently provides both waterproofness and moisture permeability, eliminating the trade-off between continuous coating formation and moisture vapor transmission
Solution Approach 2:
The invention optimizes the molecular weight, functional group content, and cross-linking density parameters of the organic polymer system to achieve a coating film with controlled porosity that allows moisture vapor diffusion while maintaining continuous waterproof coverage
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 solution significantly increases energy efficiency and durability of buildings while preventing indoor air contamination by maintaining moisture permeability and waterproofness, even in challenging environmental conditions.
Implementation Method 1
organic polymers containing at least one reactive silyl group per molecule are known to be cross-linked by siloxane bond formation involving reactions such as hydrolysis of the reactive silyl group due to moisture
Implementation Method 2
cross-linked by siloxane bond formation involving reactions such as hydrolysis of the reactive silyl group
Implementation Method 3
a waterproof sheet having both waterproofness and moisture permeability has been developed... enables to prevent entry of water from the outside as well as to release the water accumulated inside to the outside as water vapor
Data Source
AI summary
Provided is a curable composition having excellent water vapor permeability, which enables to protect a building from rainwater or moisture in the air and release the water accumulated on the side of the base of the building, to the outside. Also provided is a curable composition which has easy workability and is less likely to allow migration or exudation of a plasticizer to the surface of the cured product. Also provided is a liquid waterproof coating material having moisture permeability which contains the curable composition. The curable composition includes an organic polymer (I) that has less than one hydrolyzable silyl group per molecule on average and contains 5 to 80 wt% of oxyethylene units.