Cyclic Carbonate Blowing Agents for Safe Thermal Expansion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current thermally expandable compositions used in the automotive sector face issues with toxicity, explosiveness, and high volatile organic compound (VOC) content due to the use of traditional blowing agents, which are also environmentally prohibited, necessitating a safer and more effective alternative for sealing and reinforcing components.
Innovation Solution
A thermally expandable composition comprising an organic compound with at least two cyclic carbonate groups as a chemical blowing agent, a catalyst, a reactive binder, and a hardener/accelerator, which provides stable expansion without releasing harmful by-products and maintains a uniform foam structure across the curing temperature range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional blowing agents (ADCA, OBSH, DNPT, etc.) are used, then expansion rates are achieved, but toxicity, explosiveness, and VOC content increase
Solution Approach 1:
The patent changes the chemical composition parameters by replacing traditional blowing agents with cyclic carbonate compounds (ethylene carbonate, propylene carbonate, butylene carbonate) that have different decomposition characteristics, achieving expansion without toxic by-products
Solution Approach 2:
The patent uses disposable cyclic carbonate blowing agents that decompose completely into harmless substances (CO2 and water), eliminating the need for expensive safety handling and disposal procedures required for toxic traditional blowing agents
2Productivity
If traditional blowing agents are used, then expansion is achieved, but harmful by-products (ammonia, formaldehyde, nitrosamines) are produced
Solution Approach 1:
The patent converts the decomposition process of cyclic carbonates into a beneficial reaction that produces only CO2 and water, transforming what would be a harmful decomposition into an environmentally friendly process
Solution Approach 2:
The cyclic carbonate blowing agents create an inert decomposition environment that does not generate reactive or toxic by-products, ensuring safe expansion without contaminating the surrounding atmosphere
3Object-affected harmful factors
If physical blowing agents (gas encapsulated in polymer shell) are used, then lower toxicity is achieved, but large amounts of blowing agent mass are required
Solution Approach 1:
The patent changes the physical state parameter by using chemically active cyclic carbonate compounds instead of physically encapsulated gases, allowing for more efficient space utilization and reduced material quantity
Solution Approach 2:
The patent replaces the mechanical encapsulation system (polymer shell containing gas) with a chemical system where cyclic carbonates are integrated into the binder matrix and decompose in-situ, eliminating the need for physical containment structures
4Productivity
If highly volatile substances (pentane) are used as blowing agents, then expansion is achieved, but flammability increases
Solution Approach 1:
The cyclic carbonate blowing agents decompose to create an inert atmosphere of CO2 and water vapor, eliminating flammability risks while maintaining effective expansion capabilities
Solution Approach 2:
The cyclic carbonates serve as single-use blowing agents that completely decompose into non-flammable substances, eliminating the need for fire safety measures required when using volatile flammable blowing agents like pentane
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 composition achieves excellent expansion rates while being non-toxic and non-explosive, with minimal VOC release, effectively addressing the limitations of traditional blowing agents and ensuring compliance with environmental regulations.
Implementation Method 1
at least one organic compound comprising at least two cyclic carbonate groups as a blowing agent
Implementation Method 2
at least one catalyst for the blowing agent
Data Source
AI summary
The present application relates to a thermally expandable composition that comprises at least one organic compound having at least one cyclic carbonate group as a blowing agent, at least one catalyst for the blowing agent, at least one reactive binder and at least one hardener and/or accelerator. The invention also relates to moulded bodies containing said composition, and a method for sealing and filling hollow spaces in components, in order to strengthen or stiffen components, in particular hollow components, and for adhering movable components through use of moulded bodies of this type, as well as to the use of corresponding cyclic organic carbonates as a blowing agent in thermally expandable compositions.