One-Component Moisture-Curing Foam for Precision Adhesive Bonds
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Solution Overview
Problem
Existing foaming methods for adhesives and sealants, which rely on chemical or physical blowing agents, result in unpredictable volume expansion and direction, leading to poor application precision and difficulty in controlling the degree of foaming, causing issues with substrate alignment and joint sealing.
Innovation Solution
A one-component, moisture-curing foam comprising polymers with isocyanate and/or alkoxysilane groups, which is pre-formed and can be applied precisely, allowing for accurate adjustment of gas content and retention of shape during curing, enabling high-precision adhesive bonds and seal joints.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If chemical or physical blowing agents are used to foam compositions during or after application, then the composition can be stored in pressure containers and foamed on emergence, but the volume increase and expansion direction cannot be predicted accurately, leading to poor application precision
Solution Approach 1:
The composition is pre-formed into foam structure before application, so that the foam volume and shape are predetermined and controllable. This preliminary foaming action allows precise prediction of expansion behavior and prevents unwanted substrate movement or flow out of sealing joints during application.
2Ease of operation
If blowing agents are used to produce expanding foam during or after application, then the composition can be applied in a convenient manner, but the degree of foaming is very difficult to establish and cannot be checked prior to application
Solution Approach 1:
The foam structure and degree of foaming are established during the manufacturing process before application. This allows the foam content to be precisely controlled and verified in advance, enabling accurate prediction of the foam's volume and properties during subsequent application without the need for complex real-time measurement systems.
3Manufacturing precision
If one-component moisture-curing compositions are used, then the composition can be applied precisely and retain its shape during curing, but the field of use was previously limited and weight savings were not achieved
Solution Approach 1:
The composition's properties are optimized by adjusting parameters such as polymer composition, isocyanate group content, and moisture-curing characteristics to enable precise application and shape retention. These parameter changes allow the one-component composition to achieve both precision and versatility, expanding its application fields while maintaining weight efficiency.
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 enables precise application and retention of shape, allowing for high-precision contact adhesive bonds and seal joints, with adjustable foaming levels to produce foams with varying properties from the same composition, suitable for diverse applications.
Implementation Method 1
one-component, moisture-curing foam consisting of 10 to 60% by volume of at least one gas and a one-component, moisture-curing composition Z comprising at least one polymer P having isocyanate groups and/or alkoxysilane groups
Implementation Method 2
5 to 50% by weight, preferably 10 to 30% by weight, of carbon black, based on the total weight of the one-component, moisture-curing foam
Data Source
AI summary
The present invention relates to a one-component, moisture-curing foam consisting of 10 to 60% by volume of at least one gas and of a one-component, moisture-curing composition Z comprising at least one polymer P having isocycanate groups and/or alkoxysilane groups and 5 to 50% by weight of carbon black, based on the total weight of the one-component, moisture-curing foam.Such foams are suitable as adhesives or sealants, for the production of coatings or for the film-filling of hollow structures, in particular in vehicle construction.