Waterproof membrane
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Solution Overview
Problem
Existing waterproofing systems for building applications, particularly in roofing, face issues such as inadequate adhesion, incompatibility, and reduced resistance to aging, with polyvinylchloride-based systems being less desirable due to environmental concerns, and liquid polyurethane systems being sensitive to curing conditions, leading to inconsistent performance and long drying times.
Innovation Solution
A waterproof membrane comprising a support carrier and a cross-linked polyurethane coating composition formed by reacting a compound with hydroxyl groups and a polyisocyanate cross-linking agent, cured at controlled temperatures between 50° to 160° C, which ensures durable and reliable installation with improved adhesion and resistance to weathering and UV aging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If liquid two-component polyurethane systems are used for waterproofing, then waterproofing performance is achieved, but curing time is extended and performance consistency is compromised due to sensitivity to ambient conditions
Solution Approach 1:
The patent applies preliminary action by pre-mixing the polyol and polyisocyanate components in correct proportions within the granulate, and pre-heating them to reaction temperature before application. This allows the chemical reaction to begin immediately upon contact with the support surface, eliminating waiting time for mixing and heating on-site, and ensuring consistent curing regardless of ambient conditions.
Solution Approach 2:
The patent changes the physical state parameter from liquid to granulate form, and controls the temperature parameter by pre-heating the granulate to 50-160°C. This enables the reaction to proceed at optimal temperature independent of ambient conditions, reducing curing time from several hours to minutes while ensuring consistent performance.
2Area of stationary object
If polyvinylchloride-based waterproofing sheets are used, then waterproofing coverage is achieved, but adhesion quality and ageing resistance are reduced due to adhesive incompatibility
Solution Approach 1:
The patent applies homogeneity by ensuring the polyol and polyisocyanate components are chemically compatible and mixed in correct proportions within the granulate. This chemical homogeneity ensures complete reaction, optimal cross-linking, and strong adhesion to the support, eliminating the adhesion problems associated with incompatible adhesive systems.
3Object-affected harmful factors
If bitumen-based waterproofing sheets are used, then flame resistance is achieved, but installation complexity increases due to flame heating requirements
Solution Approach 1:
The patent replaces the mechanical/thermal installation process (flame heating) with a chemical process. The granulate undergoes exothermic chemical reaction upon contact with the support surface, self-heating and curing without external flame or heat application, thereby simplifying installation while maintaining flame resistance.
Solution Approach 2:
The patent applies self-service by designing the granulate to self-heat through exothermic reaction upon contact with the support surface. The material itself provides the necessary heat for curing without external heating equipment, making installation simpler and safer while maintaining flame resistance.
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 provides a waterproof membrane with enhanced durability and performance, allowing for faster and easier installation, independent of ambient curing conditions, and reduces environmental impact compared to traditional systems.
Implementation Method 1
wherein said polyurethane is obtained from a composition comprising at least one compound having hydroxyl groups, and at least one polyisocyanate cross-linking agent with free isocyanate groups
Implementation Method 2
curing the layer of the coating composition at temperatures in the range of 50° to 160° C
Data Source
AI summary
The invention relates to a waterproof membrane for building applications comprising at least one support carrier and at least one layer of a cross-linked coating composition comprising at least one polyurethane. The invention also relates to a waterproof membrane comprising at least one support carrier and at least one layer of a cross-linked coating composition comprising at least one polyurethane, an optional pre-coating layer to facilitate the manufacturing process, and to join the support carrier with the cross-linked coating composition in the most optimal and durable manner to achieve good surface appearance and chemical bonding between reinforcing carrier and crosslinked polyurethane coating. The waterproof membrane can be prepared and installed with lower cost in comparison to current flat roof waterproofing systems based on liquid two-component polyurethane systems.