Isocyanate-Free Polyurethane Foam via Cyclic Carbonate-Amine Reaction
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Solution Overview
Problem
Current methods for producing non-isocyanate polyurethane foams face challenges such as the use of flammable chemical blowing agents and limitations in achieving both high and low density flexible foams, with existing syntheses resulting in high density foams and environmental concerns due to carcinogenic isocyanate materials.
Innovation Solution
A process involving the reaction of multifunctional amines with multifunctional cyclic carbonates and alkoxylated derivatives, using a non-reactive blowing agent to produce isocyanate-free polyurethane foams that can be synthesized from renewable materials, allowing for the creation of both high and low density flexible foams.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If chemical blowing agents (poly(methylhydrogenosiloxane)) are used to foam NIPU, then foaming occurs through reaction with diamines, but hydrogen gas is released which is flammable and risky to handle on industrial scale
Solution Approach 1:
The harmful chemical blowing agent (poly(methylhydrogenosiloxane)) is extracted and replaced with a physical blowing agent (penultimate compound). This removes the source of flammable hydrogen gas while maintaining the foaming function through an alternative mechanism (vaporization of the physical blowing agent).
Solution Approach 2:
A physical blowing agent (penultimate compound with specific boiling point range) is introduced as an intermediary substance to perform the foaming function without the harmful side effects. This intermediary vaporizes to create gas bubbles, replacing the dangerous chemical reaction-based foaming.
2Strength
If polyisocyanates (MDI, TDI) are used to produce polyurethane foams, then good foam properties are achieved, but environmental and safety issues arise due to CMR classification
Solution Approach 1:
The harmful polyisocyanate components (MDI, TDI) are extracted from the formulation and replaced with isocyanate-free alternatives (cyclic carbonates and amines). This eliminates the CMR risks while preserving the ability to produce functional polyurethane foams through a different chemical pathway.
Solution Approach 2:
The chemical composition parameters are fundamentally changed by eliminating isocyanates and using cyclic carbonate-amine chemistry instead. This parameter change maintains foam functionality while removing harmful substances, achieving both performance and safety goals.
3Stability of the object's composition
If the blowing agent is incorporated into the backbone of the polymer, then chemical bonding is achieved, but limitations occur regarding maximal content of blowing agent and thus foam density and mechanical properties
Solution Approach 1:
The blowing agent is extracted from the polymer backbone structure and separated as a distinct physical component (penultimate compound). This allows the blowing agent to be present in variable amounts without compromising polymer integrity, enabling flexible control over foam density while maintaining mechanical 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
Enables the production of isocyanate-free polyurethane foams with improved safety, reduced density variability, and enhanced mechanical properties, suitable for various applications including insulation and automotive seating, while being biobased and environmentally friendly.
Implementation Method 1
a non-reactive blowing agent that is able to vaporize during the reaction process so as to generate bubbles in the polymeric matrix
Implementation Method 2
reacting compounds A and B with compound C in the presence of compound D and a catalyst (compound E) so as to form an expanded reaction mixture, curing said expanded reaction mixture
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
The invention concerns a curable isocyanate free formulation for preparing a polyurethane foam comprising a compound A chosen from multifunctional cyclic carbonates of formula (I) or a mixture thereof, a compound B chosen from multifunctional cyclic carbonates containing oxyalkylene groups -OR3- of formula (II) or a mixture thereof, a compound C chosen from multifunctional amines of formula (III) or a mixture thereof and a compound D chosen from non-reactive blowing agents, as well as a process for preparing a non-isocyanate polyurethane foam, a foam obtainable by this process, compound B, the mixture of compound A and compound B, the use of compound B for enhancing the solubility of a non-reactive blowing agent in a compound A and a foamable system comprising a first part A containing compound A and compound B and a second part B containing compound C, wherein part A and part B are preferably physically separated.