Phosphorus Flame Retardant for PCB Thermal Stability
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Solution Overview
Problem
Conventional printed circuit board materials face issues with high coefficient of thermal expansion, poor flame retardancy, and thermal stability due to the use of halogen-containing and phosphorus-containing flame retardants, which lead to deformation, cracking, and reduced yield during the fabrication of circuit boards.
Innovation Solution
A novel phosphorus-containing compound with a specific structure is developed, which acts as a flame retardant in a resin composition, providing high phosphorus content, high melting point, and high thermal decomposition temperature, thereby reducing the coefficient of thermal expansion and enhancing flame retardancy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If halogen-containing flame retardants are added to promote flame retardancy, then flame retardancy is improved, but environmental compliance deteriorates due to prohibitions and limitations
Solution Approach 1:
The invention changes the chemical composition parameters by developing a novel phosphorus-containing compound with specific molecular structure (formula I) that achieves effective flame retardancy without halogen content, thus meeting environmental compliance requirements while maintaining fire safety performance
Solution Approach 2:
The invention creates a composite resin composition integrating the novel phosphorus-containing compound with epoxy resin and curing agents, forming a multi-component system that delivers both flame retardancy and environmental compliance through synergistic material combination
2Reliability
If conventional phosphorus-containing flame retardants are used, then flame retardancy is achieved, but thermal stability deteriorates due to low melting point and low thermal decomposition temperature
Solution Approach 1:
The invention fundamentally changes the thermal parameters by designing a phosphorus-containing compound with elevated melting point and high thermal decomposition temperature through optimized molecular structure, thereby achieving both flame retardancy and thermal stability simultaneously
Solution Approach 2:
The invention replaces conventional phosphorus-containing flame retardants with a novel compound that maintains effectiveness throughout the service life without premature degradation, eliminating the need for frequent replacement or additional protective measures
3Reliability
If conventional phosphorus-containing flame retardants are used, then flame retardancy is achieved, but manufacturing precision deteriorates due to ionization at high temperature causing cracking
Solution Approach 1:
The invention changes the chemical stability parameters by developing a phosphorus-containing compound that resists ionization at high temperatures, thereby preventing manufacturing defects such as cracking while maintaining flame retardancy during the curing and fabrication processes
Solution Approach 2:
The invention applies preliminary anti-action by incorporating a thermally stable phosphorus-containing compound that preemptively prevents ionization and subsequent cracking during high-temperature processing, ensuring manufacturing precision before defects can occur
4Ease of manufacture
If resin material is subjected to thermal shock in reflow process, then soldering is achieved, but manufacturing precision deteriorates due to deformation and warping
Solution Approach 1:
The invention changes the thermal expansion parameters by incorporating the novel phosphorus-containing compound that reduces the coefficient of thermal expansion of the resin composition, thereby minimizing deformation and warping during reflow soldering while maintaining soldering capability
Solution Approach 2:
The invention directly addresses thermal expansion issues by developing a resin composition with reduced coefficient of thermal expansion through the novel phosphorus-containing compound, enabling the material to withstand thermal shock during soldering without compromising flatness or dimensional stability
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 compound improves the thermal stability, flame retardancy, and dimensional stability of printed circuit boards, preventing deformation and cracking, and maintaining excellent dielectric properties even under severe conditions.
Implementation Method 1
high thermal decomposition temperature, so the boards made therefrom have higher coefficient of thermal expansion
Data Source
AI summary
Disclosed is a phosphorus-containing compound capable of serving as a flame retardant to be used in conjunction with other ingredients to make resin compositions, useful for fabricating such as a prepreg, a resin film, a resin film with copper foil, a laminate or a printed circuit board, having improved one or more properties including glass transition temperature, coefficient of thermal expansion, thermal resistance, flame retardancy, dielectric constant, and dissipation factor. In addition, a method of preparing the phosphorus-containing compound and a resin composition comprising the phosphorus-containing compound are also disclosed.