Epoxy Adhesive Composition for Untreated Soft PVC Membrane Bonding
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Solution Overview
Problem
Existing adhesives for bonding soft PVC membranes lack sufficient adhesion to untreated soft PVC and are not resistant to moisture, requiring laborious pretreatment or coating methods to achieve durable bonds.
Innovation Solution
An adhesive comprising a curing agent with a specific ratio of amines, including at least one amine with a dimethylamino group and at least one amine with three amine hydrogens, is used to create a durable bond with soft PVC membranes, allowing direct bonding to substrates without pretreatment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If prior art adhesives are used for bonding soft PVC membranes, then the bonding process is simplified, but the adhesion strength is insufficient and bonds detach over time
Solution Approach 1:
The patent modifies the chemical composition parameters of the adhesive by incorporating specific amines with dimethylamino groups and controlling the amine content within 10-45 wt%, thereby achieving both strong adhesion to soft PVC and resistance to moisture without requiring complex pretreatment processes
2Reliability
If epoxy resin adhesives are used for bonding soft PVC membranes, then moisture resistance is improved, but adhesion to untreated soft PVC becomes inadequate
Solution Approach 1:
The patent creates a composite adhesive system combining epoxy resin with specific amine additives containing dimethylamino groups, where the amine component provides adhesion to soft PVC while the epoxy resin matrix provides moisture resistance, achieving both requirements simultaneously
Solution Approach 2:
The patent optimizes the concentration of amine components within 10-45 wt% of the total liquid or dissolved constituents, finding the critical threshold where sufficient adhesion is achieved without compromising moisture resistance of the epoxy system
3Strength
If adhesion-promoting coatings are applied to PVC membranes, then adhesion to epoxy resin is improved, but the process becomes laborious and complex
Solution Approach 1:
The adhesive formulation contains built-in adhesion-promoting components (specific amines with dimethylamino groups) that directly interact with soft PVC, eliminating the need for separate pretreatment or coating steps while maintaining strong adhesion and moisture resistance
4Strength
If amine content in curing agent is increased to improve adhesion, then adhesion to soft PVC improves, but water resistance of the bond deteriorates
Solution Approach 1:
The patent precisely controls the amine content within the range of 10-45 wt% of total liquid or dissolved constituents in the curing agent, identifying the optimal window where adhesion is sufficient while the epoxy resin matrix maintains its moisture-resistant properties
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 adhesive achieves high resistance to heat and moisture, with peel strengths of at least 1 N/mm after storage under humid conditions, enabling stable bonding of soft PVC membranes to various substrates, including concrete and mortar.
Implementation Method 1
the adhesive comprises a resin component comprising at least one epoxy resin and a curing agent component comprising (a) at least one amine A1 having at least one dimethylamino group and at least one amine hydrogen, and (b) at least one further amine A2 which has at least three amine hydrogens
Data Source
AI summary
An epoxy resin adhesive is used for bonding a membrane made of soft PVC to a further substrate, wherein the curing-agent component of the adhesive includes at least one amine A1 having at least one dimethylamino group and at least one amine hydrogen, and at least one further amine A2 having at least three amine hydrogens, and the curing-agent component includes, based on the total of all the liquid or dissolved constituents contained in the curing-agent component, an amine A1 content of 10 to 45 wt. %. The use allows bonding of untreated membranes made of soft PVC to form a stable, water-resistant adhesive bond and is particularly suitable for sealing tunnels, foundations and roofs.