Polyimide Resin Composition for Stable Insulated Wire Coating
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Solution Overview
Problem
Existing resin varnishes with high concentrations for forming insulating layers in insulated wires face issues with viscosity changes over time, impairing coatability and requiring multiple coating and heating steps to achieve desired thickness, thus affecting production efficiency.
Innovation Solution
A resin composition comprising a polyimide precursor derived from aromatic tetracarboxylic dianhydride and aromatic diamine, with controlled water content below 0.5% and imidization rate between 5% to 25%, along with an organic solvent, to enhance storage stability and coatability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the concentration of resin varnish is increased to form thicker coating films, then the production efficiency is improved, but the viscosity increases and coatability deteriorates
Solution Approach 1:
The patent applies parameter changes by controlling the water content within 0.01-5 mass% and the imidization rate within 5-25%, which optimizes the viscosity and coatability of the resin varnish while maintaining high concentration for improved production efficiency
2Productivity
If the concentration of resin varnish is increased to reduce the number of coating steps, then the production efficiency is improved, but the viscosity changes over time and storage stability deteriorates
Solution Approach 1:
The patent applies parameter changes by precisely controlling the water content (0.01-5 mass%) and imidization rate (5-25%) to achieve optimal storage stability. This allows the resin varnish to maintain its properties over time while enabling higher concentration formulations that reduce the number of coating steps required
3Ease of operation
If multiple coating and heating steps are used to achieve desired film thickness, then the coatability is maintained, but the production efficiency decreases
Solution Approach 1:
The patent applies parameter changes by optimizing the water content (0.01-5 mass%) and imidization rate (5-25%) to achieve a balance where sufficient film thickness can be obtained in fewer coating steps while maintaining good coatability, thus improving production efficiency without sacrificing coating quality
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 resin composition maintains excellent storage stability, improves film uniformity, and reduces the number of coating and heating steps, enhancing manufacturing efficiency and maintaining heat resistance and toughness of the insulating layer.
Implementation Method 1
In the heating step, the polyimide precursor is imidized to form polyimide
Data Source
AI summary
A resin composition according to one aspect contains: a polyimide precursor which is the reaction product of an aromatic tetracarboxylic dianhydride and an aromatic diamine; an organic solvent; and water. The resin composition has a water content of less than 0.5 mass %.