Polyester Polyol with Alicyclic Diol for Acid Alkali Resistance
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Solution Overview
Problem
Polyurethanes require improved acid and alkali resistance in addition to flexibility and hydrolysis resistance, especially due to issues like acid rain and salt damage, which current polyester polyols containing 3-methyl-1,5-pentanediol do not adequately address.
Innovation Solution
Incorporating 1,3-propanediol with an alicyclic skeleton into the polyester polyol, alongside 3-methyl-1,5-pentanediol, enhances the acid and alkali resistance of the polyurethane while maintaining flexibility and hydrolysis resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polyester polyol containing only 3-methyl-1,5-pentanediol is used, then flexibility and hydrolysis resistance are improved, but acid resistance and alkali resistance are insufficient
Solution Approach 1:
The patent uses a composite diol system combining 3-methyl-1,5-pentanediol (providing flexibility and hydrolysis resistance) with 1,3-propanediol having an alicyclic skeleton in side chain (providing acid and alkali resistance). This composite approach allows the polyurethane to simultaneously achieve multiple performance requirements that cannot be met by a single diol component alone.
Solution Approach 2:
The patent introduces 1,3-propanediol with an alicyclic skeleton in side chain as a specific functional component within the diol mixture. This component is specifically selected to provide local chemical resistance properties (acid and alkali resistance) while the 3-methyl-1,5-pentanediol provides the flexibility function, creating differentiated functional zones within the polymer structure.
2Object-affected harmful factors
If polyurethane environmental resistance is improved to address acid rain and salt damage, then acid resistance and alkali resistance are enhanced, but this requires complex polyol formulation
Solution Approach 1:
The patent modifies the chemical structure parameters of the diol component by selecting 1,3-propanediol with a specific alicyclic skeleton in the side chain. This structural parameter change (introducing the alicyclic group) directly enhances acid and alkali resistance without requiring complex multi-component formulations or additional additives, thus achieving environmental resistance with relatively simple formulation.
Data Source
AI summary
A polyester polyol from which a polyurethane having acid resistance and alkali resistance can be produced. A polyester polyol containing 1,3-propandiol having an alicyclic skeleton in a side chain, 3-methyl-1,5-pantanediol, and a dibasic acid component as constituent components.