Polycarbonate DIOL, method for producing polycarbonate DIOL, and polyurethane
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing polycarbonate diols derived from linear aliphatic diols with 2 to 20 carbon atoms, such as 1,6-hexanediol, fail to maintain good chemical resistance and mechanical properties uniformly, leading to variations in quality and increased production costs in polyurethane production.
Innovation Solution
Incorporating a structural unit derived from an amine, such as 6-amino-1-hexanol, into the polycarbonate diol composition to enhance mechanical properties and chemical resistance, with controlled content between 1 ppm to 80 ppm by mass of nitrogen atoms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a linear aliphatic diol having 2 to 20 carbon atoms, such as 1,6-hexanediol, is used as a raw material dihydroxy compound for polycarbonate diol, then the polyurethane can be produced on an industrial scale, but the mechanical properties show variation and chemical resistance is not maintained uniformly
Solution Approach 1:
The invention changes the chemical composition parameter of the polycarbonate diol by incorporating a specific amine-based compound (6-amino-1-hexanol) at controlled concentrations (1-80 ppm by mass of nitrogen atoms). This parameter change stabilizes the polyurethane's mechanical properties and chemical resistance while maintaining industrial production efficiency.
Solution Approach 2:
The invention creates a composite polycarbonate diol system by combining the linear aliphatic diol (1,6-hexanediol) with a small amount of amine-based compound (6-amino-1-hexanol). This composite approach leverages the benefits of both components: the scalability of 1,6-hexanediol-based polyurethane and the stabilizing effect of the amine compound on mechanical properties and chemical resistance.
2Strength
If 1,6-hexanediol is combined with another dihydroxy compound to improve flexibility, crystallinity, and strength, then the polyurethane properties are enhanced, but production cost increases
Solution Approach 1:
Instead of using large amounts of additional dihydroxy compounds to improve mechanical properties, the invention applies a small but effective amount (1-80 ppm by mass of nitrogen atoms) of 6-amino-1-hexanol. This partial action achieves the desired mechanical property enhancement and chemical resistance stabilization without the excessive cost associated with larger additions of multiple dihydroxy compounds.
3Productivity
If a tertiary amino alcohol is contained in a polycarbonate diol composition to prevent coloration and improve reactivity, then production efficiency is improved, but the influence on mechanical properties and chemical resistance remains insufficient
Solution Approach 1:
The invention uses 6-amino-1-hexanol, which has a structural similarity to tertiary amino alcohols (both contain amino groups), but with different functional characteristics. This 'copying' approach maintains the beneficial effects of amino compounds (coloration prevention, reactivity improvement) while adding the specific advantage of stabilizing mechanical properties and chemical resistance that tertiary amino alcohols alone cannot provide.
Data Source
AI summary
A polycarbonate diol contains a structural unit (1) represented by the following general formula (I) and a structural unit (2) represented by the following general formula (II).(In the general formula (I), R represents a hydrocarbon group having 2 to 20 carbon atoms, which may have a substituent or a hetero atom.)(In the general formula (II), m is an integer of 2 to 20. R2 represents an alkyl group having 1 to 20 carbon atoms which may have a substituent, or a hydrogen atom.)