Polyimide Conductor Coating with BN-Silica Dispersion for Heat Resistance
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Solution Overview
Problem
Existing polyimide varnishes face challenges in achieving enhanced pulse endurance, adhesion, thermal conductivity, and improved coefficients of friction while maintaining productivity and process efficiency, often resulting in defects such as surface defects and carbonization when cured at high temperatures.
Innovation Solution
The polyimide varnish is formulated with a polyamic acid solution containing diamine and dianhydride monomers, along with a first additive of boron nitride, a second additive of nanosilica, and a dispersant to improve dispersion, thereby enhancing the varnish's properties after curing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the curing furnace temperature is extremely high to improve physical properties, then heat resistance and insulation properties are improved, but surface defects and carbonization occur
Solution Approach 1:
The patent modifies the chemical composition parameters of the polyimide resin by incorporating specific diamine and dianhydride monomers in controlled ratios, along with additives like boron nitride and nanosilica. This allows achieving excellent heat resistance and insulation properties without requiring extremely high curing temperatures, thereby preventing surface defects and carbonization while maintaining reliable thermal performance.
2Productivity
If the number of coatings is extremely small or coating speed is extremely fast to improve productivity, then manufacturing efficiency increases, but physical properties of the coating are deteriorated
Solution Approach 1:
The patent creates a composite polyimide varnish formulation combining multiple monomers (diamine and dianhydride) with functional additives including boron nitride for thermal conductivity and nanosilica for mechanical reinforcement. This composite material structure enables the coating to achieve excellent physical properties even when applied in fewer coats or at higher speeds, as the enhanced material composition compensates for reduced coating layers.
3Ease of manufacture
If general polyimide resin is used to maintain simplicity, then ease of manufacture is maintained, but adhesion to conductors is insufficient causing appearance defects
Solution Approach 1:
The patent enhances the local quality of the polyimide varnish by incorporating specific functional components: boron nitride particles for thermal management and adhesion promotion, nanosilica for mechanical bonding, and a carefully selected mixture of diamine and dianhydride monomers. These localized functional enhancements within the varnish formulation provide excellent adhesion to conductor surfaces while maintaining the overall simplicity of the manufacturing process.
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 achieves improved pulse endurance, adhesion, thermal conductivity, and reduced coefficients of friction, leading to enhanced performance and reliability of the polyimide coating, particularly suitable for high-functional conductor coatings in electric vehicles.
Implementation Method 1
enhancing the varnish's properties after curing... improved thermal conductivity
Implementation Method 2
performing solution polymerization on aromatic dianhydride and aromatic diamine or aromatic diisocyanate to produce a polyamic acid derivative, followed by ring-closure dehydration at high temperature and imidization
Implementation Method 3
a dispersant to improve dispersion
Data Source
Figure 1~1-3
AI summary
Provided is polyimide varnish comprising: a polyamic acid solution containing diamine monomer and dianhydride monomer as polymerized units; a first additive containing boron nitride; a second additive containing nanosilica; and a dispersant.