Polyol Composition Balancing Viscosity and Pot Life in Polyurethane Resin
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Solution Overview
Problem
Existing polyurethane resin compositions face issues with high viscosity and reduced pot life when using N,N,N′,N′-tetrakis(2-hydroxypropyl)-ethylenediamine, leading to defective filling and insufficient moisture and heat resistance in cured resins.
Innovation Solution
A polyol composition containing an ester of hydroxycarboxylic acid and amine or polyamine polyols with specific oxyalkylene group ratios, providing low viscosity and long pot life, resulting in improved castability and enhanced moisture and heat resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If N,N,N′,N′-tetrakis(2-hydroxypropyl)-ethylenediamine is used to extend pot life, then the working time is improved, but the viscosity increases causing defective filling
Solution Approach 1:
The patent applies parameter changes by carefully controlling the amount of N,N,N′,N′-tetrakis(2-hydroxypropyl)-ethylenediamine within a specific range (0.1-5 parts by weight per 100 parts by weight of polyol component) and adjusting the equivalent ratio of polyol to polyisocyanate (0.95-1.05) to achieve the optimal balance between extended pot life and acceptable viscosity for proper filling
Solution Approach 2:
The patent uses a composite polyol component comprising multiple polyols including polyester polyol, polyether polyol, and the specific amine polyol N,N,N′,N′-tetrakis(2-hydroxypropyl)-ethylenediamine in defined proportions. This composite approach allows the system to benefit from the extended pot life of the amine polyol while the other polyols contribute to maintaining appropriate viscosity and overall performance
2Quantity of substance
If oxyalkylene groups are increased to reduce viscosity, then the fluidity is improved, but the moisture and heat resistance deteriorates
Solution Approach 1:
The patent applies parameter changes by precisely controlling the equivalent ratio of polyol to polyisocyanate within 0.95-1.05 and limiting the amount of oxyalkylene-containing polyols to maintain the right balance between low viscosity for good castability and sufficient moisture/heat resistance for reliable cured resin performance
Solution Approach 2:
The patent applies local quality by using different types of polyols with specific functions: polyester polyol for structural integrity and moisture resistance, polyether polyol for flexibility and low viscosity, and controlled amounts of oxyalkylene-containing polyols to achieve the desired viscosity without compromising the moisture and heat resistance provided by the polyester component
Data Source
AI summary
The present invention aims to provide a polyol composition for producing a polyurethane resin, the polyol composition being capable of providing a polyurethane resin-forming composition having low viscosity and an appropriately long pot life and thus having good castability and providing a cured polyurethane resin having excellent moisture and heat resistance and substrate adhesion. The present invention relates to a polyol composition for producing a polyurethane resin, the polyol composition containing an ester (A) of a hydroxycarboxylic acid (h) and at least one of an amine polyol (a1) represented by the following formula (1) or a polyamine polyol (a2) represented by the following formula (2).