Flame-Retardant Polyamide Composition for High-Temperature Insulation
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Solution Overview
Problem
Polyamide resin compositions with added flame retardants experience a decrease in electrical resistance at high temperatures, particularly around 130°C, which is a concern for electrical devices with increasing output and reduced size.
Innovation Solution
A polyamide resin composition comprising a polyamide resin with specific dicarboxylic acid and diamine units, combined with flame retardants such as polybrominated styrene or phosphinate compounds, and optionally antimony compounds, to maintain high electrical resistance and mechanical strength at elevated temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a flame retardant is added to a polyamide resin composition to enhance heat resistance, then heat resistance is improved, but electrical resistance decreases at high temperatures
Solution Approach 1:
The patent changes the chemical composition parameters of the polyamide resin by specifying precise mol% ranges of diamine units (5-50 mol% of 1,3-bis(aminomethyl)cyclohexane unit, 45-95 mol% of C6-18 aliphatic alkylenediamine unit) to optimize the balance between heat resistance and electrical resistance. This compositional parameter adjustment allows the resin to maintain high electrical resistance even when flame retardants are added.
Solution Approach 2:
The patent creates a composite polyamide resin system by combining multiple diamine components (1,3-bis(aminomethyl)cyclohexane and C6-18 aliphatic alkylenediamine) with dicarboxylic acid components. This composite approach allows the material to achieve both improved heat resistance and maintained electrical resistance through synergistic effects of different molecular structures.
2Volume of moving object
If the size of electrical devices is reduced to cope with miniaturization trends, then device size is decreased, but electrical resistance stability at high temperature becomes more difficult to maintain
Solution Approach 1:
The patent adjusts the molecular composition parameters of the polyamide resin to compensate for the reduced thermal mass in smaller devices. By optimizing the diamine unit composition (specifically incorporating 1,3-bis(aminomethyl)cyclohexane units at 5-50 mol%), the resin maintains stable electrical resistance properties even in miniaturized devices operating at high temperatures.
3Power
If a polyamide resin composition is designed for high output electrical devices, then power handling capability is increased, but electrical resistance decreases due to higher operating temperatures
Solution Approach 1:
The patent modifies the chemical composition parameters of the polyamide resin to withstand higher operating temperatures associated with high power applications. The specific formulation (5-50 mol% 1,3-bis(aminomethyl)cyclohexane units combined with C6-18 aliphatic alkylenediamine units) provides thermal stability that maintains electrical resistance even under high power conditions.
Data Source
AI summary
Provided is a polyamide resin composition that has high electrical resistance in a high temperature range (around 130° C.) and high heat resistance. The polyamide resin composition includes: a polyamide resin that includes a component unit (a) derived from an aromatic dicarboxylic acid or an alicyclic dicarboxylic acid and a component unit (b2) derived from a diamine represented by formula (1); and at least one flame retardant (X) selected from the group consisting of polybrominated styrenes, brominated polystyrenes, and brominated polyphenylenes, or a flame retardant (Y) containing a specific phosphinate compound, a specific bisphosphinate compound, or a polymer of these compounds. In formula (1), n and the two instances of m are each independently 0 or 1, and —X— is a single bond or a divalent group selected from the group consisting of —O—, —S—, —SO2—, —CO—, and —CH2—.