Polyether Carbonate Polyols from Waste CO2
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Solution Overview
Problem
Current impact modifiers, such as styrene/butadiene copolymers and acrylonitrile-butadiene-styrene copolymers, are expensive and unsuitable for certain applications, and there is a need for alternatives that offer improved toughness and adhesive properties, particularly at low temperatures, while also reducing the carbon footprint.
Innovation Solution
Development of highly branched polyether carbonate polyols with a nominal functionality of at least 3 and an equivalent molecular weight of 20,000 to 500,000 Dalton, incorporating 0.5 wt % to 35 wt % CO2, synthesized using a DMC-catalyzed co-polymerization process involving a polymeric polyol initiator and alkylene oxides, which can be used as impact modifiers, adhesives, and self-healing materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional impact modifiers (SBS, ABS copolymers) are used, then toughness improvement is achieved, but production cost increases and suitability for certain applications is limited
Solution Approach 1:
The patent changes the chemical composition parameters by using polyether carbonate polyols with specific molecular weights (20,000-500,000 Dalton) and CO2 content (0.5-35 wt%), replacing traditional rubber-based impact modifiers. This parameter change achieves both toughness improvement and cost reduction, as the new polyols can be produced from cheaper raw materials including waste oils and CO2
Solution Approach 2:
The invention creates composite impact modifiers by combining polyether carbonate polyols with polymers containing isocyanate groups. This composite approach allows the material to exhibit both the toughness enhancement from the polyol and the structural integrity from the polymer matrix, while using cost-effective components
2Strength
If polyether carbonate polyols with high molecular weight are synthesized, then impact properties and adhesive properties are improved, but manufacturing complexity increases
Solution Approach 1:
The patent uses a catalyst system as an intermediary to simplify the synthesis of high molecular weight polyether carbonate polyols. The catalyst facilitates the co-polymerization of alkylene oxides and CO2, enabling the production of high molecular weight polymers with controlled structure and properties without excessive manufacturing complexity
Solution Approach 2:
The polyether carbonate polyols developed in this patent serve multiple functions simultaneously: they act as impact modifiers, adhesives, and self-healing materials. This multi-functionality reduces the need for separate specialized materials, simplifying the overall manufacturing process while improving performance
3Ease of operation
If conventional adhesives are used, then adhesive properties are achieved, but low-temperature adhesion and environmental friendliness are insufficient
Solution Approach 1:
The patent modifies the thermal and mechanical parameters of adhesive materials by incorporating polyether carbonate polyols with specific molecular weights and CO2 content. These parameter changes enable the adhesive to maintain flexibility and bonding capability at low temperatures while improving environmental friendliness through CO2 incorporation and reduced reliance on petroleum-based materials
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 new polyether carbonate polyols exhibit excellent impact properties, maintain adhesiveness at low temperatures, and demonstrate self-healing capabilities, providing a cost-effective and environmentally friendly alternative to traditional impact modifiers, suitable for various polymer blends and adhesive applications.
Implementation Method 1
synthesized using a DMC-catalyzed co-polymerization process involving a polymeric polyol initiator and alkylene oxides
Implementation Method 2
DMC-catalyzed co-polymerization process
Data Source
AI summary
A polyether carbonate polyol with a nominal functionality of 3 or more includes an equivalent molecular weight between 20,000 and 500,000 Da, and content of between 0.5 wt % and 35 wt % of CO2 based on the total weight of the polyether carbonate polyol. The polyether carbonate polyol has adhesive and impact modifying properties.