Polyamic Acid Resin Composition for High-Concentration Wire Insulation
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Solution Overview
Problem
Existing resin compositions containing polyamic acid have low molecular weight and poor productivity, leading to insufficient concentration and poor production efficiency for insulated electrical wires, with challenges in maintaining film properties and thermal stability.
Innovation Solution
A resin composition with controlled molecular weight and structure, produced through a single-stage reaction process, incorporating a polyamic acid with specific end-capping and a solvent system, allowing high concentration and improved physical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a polyamic acid is synthesized through multi-stage reaction process to control molecular weight, then the molecular weight can be controlled, but the productivity deteriorates
Solution Approach 1:
The patent combines multiple reaction stages into a single-stage reaction process. By using a diamine compound with controlled molar ratio (0.94-0.98 mol per 1 mol of acid dianhydride) and conducting the reaction in one stage, the patent achieves both molecular weight control and improved productivity, eliminating the need for separate end-capping steps while maintaining coating film properties
Solution Approach 2:
The patent changes the reaction parameters by controlling the molar ratio of diamine compound to acid dianhydride within a specific range (0.94-0.98). This parameter control allows the reaction to produce polyamic acid with appropriate molecular weight and end-group structure in a single stage, resolving the contradiction between molecular weight control and productivity
2Productivity
If the concentration of polyamic acid is increased to improve production efficiency, then the production efficiency improves, but the film properties deteriorate
Solution Approach 1:
The patent optimizes the concentration of polyamic acid within a specific range (20-40 mass%) and controls the molar ratio of diamine compound to achieve the best balance between production efficiency and film properties. This parameter optimization allows high concentration while maintaining excellent coating film properties including adhesion, flexibility, and electrical insulation
Solution Approach 2:
The patent uses a polyamic acid with specific end-group structure (formula 2) that replicates the desirable properties of lower molecular weight polyamic acids while achieving higher concentration. The end-capped structure prevents excessive chain extension during curing, maintaining film properties even at high concentrations
3Quantity of substance
If the molecular weight of polyamic acid is increased to improve concentration, then the concentration improves, but the ease of manufacture deteriorates
Solution Approach 1:
The patent merges the molecular weight increase and concentration improvement into a single-stage reaction process. By controlling the diamine compound molar ratio and conducting one-stage polymerization, the patent achieves high concentration polyamic acid without complex multi-stage manufacturing, improving ease of manufacture while maintaining high concentration
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 achieves high productivity and excellent film properties, including improved thermal stability and mechanical strength, suitable for forming insulating layers in electrical wires.
Implementation Method 1
a diamine compound and an acid dianhydride are reacted in a molar ratio of 0.94 to 0.98 mol of the diamine compound per 1 mol of the acid dianhydride
Data Source
AI summary
The resin composition according to one aspect is a resin composition containing a polyamic acid and a solvent, wherein the polyamic acid has a repeating unit represented by the following general formula (1) in a molecular chain, and the molecular chain has a structure represented by the following general formula (2) at one end or both ends. The proportion of the structure represented by the following general formula (2) relative to 1 mol of the repeating unit represented by the following general formula (1) is 0.001 mol or more and 0.1 mol or less. In the following general formulas, R1 is a tetravalent organic group; R2 is a divalent organic group; and R3 is an organic group having 15 or less carbon atoms.