Polysiloxane Polyester Polyol for Low-Friction Polyurethane Fibers
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Solution Overview
Problem
Polyurethane-based elastic fibers face issues with high stickiness and frictional resistance during processing, leading to fiber breakage and machine wear, and existing solutions like finishing oils and smoothing agents either fail to provide sufficient sticking prevention or cause product staining and clogging.
Innovation Solution
A process using a polyester polyol with ester bonds formed from a polycarboxylic acid having a polysiloxane framework and a polyether polyol, which results in a polyurethane with high peeling property and homogeneity, and a specific Si/C ratio in the surface, improving unwinding processability without the need for finishing oils or smoothing agents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If finishing oils or smoothing agents are added to polyurethane-based elastic fibers, then frictional resistance is reduced, but product staining and clogging of machines occur
Solution Approach 1:
The invention extracts and eliminates the need for finishing oils and smoothing agents by incorporating silicon atoms directly into the polyol molecular structure. This removes the harmful external substances while maintaining the desired low-friction properties, thereby preventing product staining and machine clogging.
Solution Approach 2:
Silicon atoms serve as an intermediary element that mediates between the polyol molecules, reducing frictional resistance and improving unwinding processability without requiring external finishing agents. The silicon atoms are integrated into the molecular structure, acting as an internal lubricant that prevents both fiber breakage and machine wear.
2Reliability
If polyester polyol with polysiloxane framework is used, then peeling property and homogeneity are improved, but manufacturing complexity increases
Solution Approach 1:
The invention merges the polyester polyol and polysiloxane components into a single integrated polyester polyol with a polysiloxane framework. This combination achieves both improved peeling property and homogeneity while simplifying the manufacturing process by eliminating the need for separate finishing agent application steps.
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 solution provides polyurethane fibers and films with excellent peeling properties and homogeneity, reducing stickiness and machine wear, while maintaining transparency and flexibility, thus enhancing the production efficiency and quality of elastic fibers and films.
Implementation Method 1
a polyester polyol (a-1) obtained by forming an ester bond between either a carboxyl group of a polycarboxylic acid (i-1) having a polysiloxane framework and a plurality of carboxyl groups or an ester group of a polycarboxylic acid ester (i-2) having a polysiloxane framework and a plurality of ester groups, and a hydroxyl group of a polyether polyol (ii)
Data Source
AI summary
A process for producing a polyurethane, which comprises using a polyester polyol (a-1), a polyether polyol (b), an isocyanate compound (c) and a chain extender (d) as a raw material to produce a polyurethane, wherein the polyester polyol (a-1) is a polyester polyol (a-1) obtained by forming an ester bond between either a carboxyl group of a polycarboxylic acid (i-1) having a polysiloxane framework and a plurality of carboxyl groups or an ester group of a polycarboxylic acid ester (i-2) having a polysiloxane framework and a plurality of ester groups, and a hydroxyl group of a polyether polyol (ii).