Polyimide Precursor Solution Composition Low-Temperature Processing
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Solution Overview
Problem
Existing polyimide precursor solutions face challenges in producing polyimide-resin-formed products with properties equal to or superior to straight-chain polyimides at relatively low temperatures and in a short time, while maintaining stable solution viscosity and high toughness, especially for applications like polyimide films and electrochemical element electrodes.
Innovation Solution
A polyimide precursor solution composition is developed by adding a low molecular-weight mellitic acid compound or a combination of carboxylic acid compounds with specific molecular structures to a polyamic acid solution, allowing for adjustment of solution viscosity and production of polyimide resins with high physical properties through controlled heating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If chemical imidization is used to achieve low-temperature processing, then processing temperature is reduced, but solution stability deteriorates due to gelation
Solution Approach 1:
The patent introduces a polyol compound as an intermediary substance that mediates between the polyamic acid and the imidization process. This polyol forms a complex with the polyamic acid, preventing premature gelation while enabling low-temperature imidization to proceed successfully, thus resolving the contradiction between low processing temperature and solution stability
Solution Approach 2:
The patent changes the chemical parameters of the system by adding specific polyol compounds with controlled molecular weights and hydroxyl group contents. This parameter change modifies the reaction kinetics and gelation behavior, allowing the solution to remain stable at low temperatures during processing while achieving complete imidization
2Reliability
If thermal imidization is used to maintain solution stability, then solution stability is preserved, but processing time increases due to prolonged heating requirements
Solution Approach 1:
The polyol compound acts as a catalyst and intermediary that accelerates the imidization reaction kinetics. By forming a reactive complex with polyamic acid, it enables the reaction to proceed rapidly at lower temperatures, dramatically reducing processing time while maintaining solution stability throughout the process
Solution Approach 2:
The patent employs a multi-stage heating process with periodic temperature increases. The initial stage occurs at lower temperature with the polyol mediator present, followed by progressive temperature increases to complete imidization. This periodic temperature action optimizes both solution stability and processing efficiency
3Object-affected harmful factors
If cross-linking components are added to improve solvent resistance, then solvent resistance is enhanced, but mechanical properties deteriorate due to increased brittleness
Solution Approach 1:
The patent precisely controls the molecular weight parameters and hydroxyl group content parameters of the polyol compound. By optimizing these parameters, the polyol provides sufficient cross-linking for solvent resistance while maintaining adequate chain flexibility, thus achieving a balance between solvent resistance and mechanical properties without excessive brittleness
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 enables the production of polyimide films and other products with properties comparable to or exceeding those of straight-chain polyimides, while maintaining stable viscosity and high toughness, facilitating their use in applications such as films, endless belts, and electrochemical element electrodes.
Implementation Method 1
thermal imidization; (b) chemical imidization using a dehydrator; and (c) a combination of thermal and chemical imidization
Implementation Method 2
chemical imidization using a dehydrator
Implementation Method 3
the solution is prone to gelate, thus posing difficulty in producing polyimide-resin-formed products with satisfactory quality
Data Source
AI summary
A first polyimide precursor solution composition contains: (A) a polyamic acid; (B) a carboxylic acid compound having at least three pairs of carboxyl groups within its molecule or an esterified product thereof; and (D) a solvent. A second polyimide precursor solution composition contains the components (A), (B), and (D) of the first polyimide precursor solution composition and additionally containing (C) a carboxylic acid compound having two pairs of carboxyl groups within its molecule or an esterified product thereof. A third polyimide precursor solution composition contains the components of the second polyimide precursor solution composition, wherein the polyamic acid (A) is a polyamic acid having a specific structure.