Polyurethane Foam Green Content via Polyol Blend
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Solution Overview
Problem
The challenge is to produce polyurethane foams with high renewable and recycled content for automotive interior parts like hoodliners and headliners without relying heavily on natural oils, while maintaining the physical properties of traditional water-blown foams.
Innovation Solution
The solution involves an isocyanate-reactive composition comprising a polyol blend with a polyether polyol and an aromatic polyester polyol, a blowing agent composition primarily consisting of water, and a catalyst, which together achieve a green content of at least 30% by weight, allowing for the production of polyurethane foams with enhanced renewable and recycled content without the need for natural oils.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If natural oils or natural oil polyols are used to produce polyurethane foams with renewable content, then green content is improved, but physical properties deteriorate and odiferous characteristics appear
Solution Approach 1:
The patent changes the chemical parameters of the polyol blend by specifying precise OH number ranges (200-400 mg KOH/g for aromatic polyester polyol, 20-50 mg KOH/g for polyether polyol) and functionality ranges (1.5-3 for aromatic polyester polyol, 2-6 for polyether polyol). These parameter changes enable the formulation to achieve both high renewable content (30-70%) and acceptable physical properties without relying on natural oils.
Solution Approach 2:
The patent creates a composite polyol system by blending aromatic polyester polyol and polyether polyol in specific ratios (30-70 wt% aromatic polyester polyol, 70-30 wt% polyether polyol). This composite approach allows the formulation to combine the renewable content benefits of aromatic polyester polyol with the physical property benefits of polyether polyol, resolving the contradiction between green content and performance.
2Quantity of substance
If polyether polyol with low OH number is used in high amounts, then renewable content is improved, but foam density and strength deteriorate
Solution Approach 1:
The patent specifies that the polyether polyol must have an OH number of 20-50 mg KOH/g and functionality of 2-6, with the composition containing 70-30 wt% polyether polyol. These controlled parameter changes ensure that while using high amounts of polyether polyol for renewable content, the foam maintains adequate strength and density characteristics.
3Quantity of substance
If aromatic polyester polyol with high OH number is used, then green content is improved, but foam elasticity and resistance to breakage deteriorate
Solution Approach 1:
The patent controls the OH number of aromatic polyester polyol within the range of 200-400 mg KOH/g and functionality within 1.5-3, with the composition containing 30-70 wt% aromatic polyester polyol. These parameter changes balance the renewable content advantage with the maintenance of foam elasticity and breakage resistance.
Solution Approach 2:
The patent formulates a composite polyol blend where aromatic polyester polyol (30-70 wt%) provides renewable content while polyether polyol (70-30 wt%) contributes elasticity and breakage resistance. The synergistic combination in this specific ratio range resolves the contradiction between green content and mechanical properties.
Data Source
AI summary
Isocyanate-reactive composition that include a polyol blend, a blowing agent composition, and a catalyst. The polyol blend includes a polyether polyol having a functionality of 2 to 6 and an OH number of 20 to 50 mg KOH/g, which is present in an amount of at least 30% by weight, based on total weight of the isocyanate-reactive composition, and an aromatic polyester polyol having a functionality of 1.5 to 3 and an OH number of 150 to 450 mg KOH/g, which is present in an amount of at least 40% by weight, based on total weight of the isocyanate-reactive composition. The blowing agent composition includes water, the water being present in an amount of 1 to 20% by weight, based on total weight of the isocyanate-reactive composition and in an amount of at least 90% by weight, based on total weight of the blowing agent composition. The isocyanate-reaction composition has a green content of at least 30% by weight, based on total weight of the isocyanate-reactive composition. Polyurethane foam-forming reaction mixtures, polyurethane foams, multi-layer composite articles and methods for their production are also described.