Rigid Polyurethane Foam Composite Profiles Deformation
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Solution Overview
Problem
Existing methods for producing composite profiles with metal shells and rigid polyurethane foam for window and door frames face issues such as deformation during high-temperature painting, poor mechanical properties at low temperatures, and dust generation during cutting, often requiring inorganic fillers that can be detrimental.
Innovation Solution
A method involving the use of polyisocyanate, polyfunctional isocyanate-reactive compounds, blowing agents like formic acid, flame retardants, and catalysts to form rigid polyurethane foam without inorganic fillers, ensuring complete filling and maintaining mechanical integrity and preventing deformation during painting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If inorganic fillers are added to rigid polyurethane foam to prevent deformation during high-temperature painting, then deformation is reduced, but dust generation during cutting increases and mechanical flexibility deteriorates
Solution Approach 1:
The invention extracts and removes inorganic fillers from the rigid polyurethane foam composition while maintaining dimensional stability during painting through optimized foam formulation and controlled foaming process, thereby eliminating dust generation during cutting operations
Solution Approach 2:
The invention changes the chemical composition parameters of the rigid polyurethane foam by using specific polyol and isocyanate ratios, along with controlled blowing agents, to achieve dimensional stability without requiring inorganic fillers, thus preventing dust generation
2Manufacturing precision
If inorganic fillers are added to rigid polyurethane foam to prevent deformation during high-temperature painting, then deformation is reduced, but mechanical flexibility and cold-temperature properties deteriorate
Solution Approach 1:
The invention removes inorganic fillers from the foam composition and replaces them with optimized polymeric components that maintain both dimensional stability during painting and mechanical flexibility at low temperatures
Solution Approach 2:
The invention uses a composite formulation of organic polymers, polyols, and isocyanates to create a homogeneous rigid polyurethane foam that provides both dimensional stability during high-temperature painting and maintains mechanical flexibility at low temperatures without inorganic fillers
3Manufacturing precision
If the cavity is only partially filled with polyurethane foam to avoid deformation, then some deformation is prevented, but thermal insulation properties deteriorate
Solution Approach 1:
The invention changes the foaming parameters and chemical composition to enable complete cavity filling while maintaining dimensional stability, achieving both full thermal insulation coverage and resistance to deformation during painting
Solution Approach 2:
The invention uses controlled excess foaming with optimized chemistry to ensure complete filling of the cavity between metal shells and polyamide webs, achieving full thermal insulation while the foam's chemical composition prevents deformation
4Manufacturing precision
If conventional foam formulations with inorganic fillers are used, then dimensional stability during painting is improved, but brittleness increases and cold flexibility is lost
Solution Approach 1:
The invention changes the chemical parameters by using specific polyol types, isocyanate indices, and blowing agent combinations to create a foam that remains flexible at low temperatures while maintaining dimensional stability during painting, eliminating the need for inorganic fillers
Solution Approach 2:
The invention creates a homogeneous composite polymeric material with optimized molecular structure that provides both dimensional stability during high-temperature painting and maintains flexibility at low temperatures, replacing inorganic filler-based formulations
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 prevents deformation during high-temperature painting, maintains mechanical properties at low temperatures, and reduces dust generation during processing, while avoiding the drawbacks of inorganic fillers.
Implementation Method 1
deformation of the composite elements due to the gas expansion in the rigid polyurethane foam
Implementation Method 2
the different thermal expansion of aluminum and rigid polyurethane foam
Implementation Method 3
one or more blowing agents at least comprising formic acid
Data Source
AI summary
The invention relates to a method for producing composite profiled elements comprising at least two metal shells which are connected by connecting pieces made of a thermoplastic material and comprising a core made of rigid polyurethane foam. The method has the steps of introducing the starting components of the rigid polyurethane foam into a cavity formed by the metal shells, wherein the rigid polyurethane foam is formed, and subsequently coating the outer surface of the composite profile using a powder coating or a baking enamel, said rigid polyurethane foam being obtained by reacting the following components: A) at least one polyisocyanate, B) at least one multifunctional compound which is reactive towards isocyanates, C) one or more propellants at least comprising formic acid, D) optionally one or more flame retardants, E) optionally one or more catalysts, and F) optionally other auxiliary agents or additives. The starting components of the rigid polyurethane foam do not contain inorganic fillers.