Phosphorus Polycyclic Hydroxy Compounds for Moisture-Stable Epoxy Dielectrics
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Solution Overview
Problem
Existing flame retardants for epoxy resins used in electronic and electrical applications face challenges in maintaining high heat resistance, dielectric properties, and low moisture absorption while preventing changes in dielectric properties after water absorption, particularly in the context of evolving electronic devices requiring advanced flame retardancy and low transmission loss.
Innovation Solution
A phosphorus-containing polycyclic aromatic hydroxy compound with a specific structure, represented by general formulas (1) and (3), is synthesized through a controlled reaction of polycyclic aromatic hydroxy compounds with phosphorus oxyhalides, ensuring balanced flame retardancy, heat resistance, and low dielectric property changes after water absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If DOPO molecular framework is introduced to achieve flame retardancy, then flame retardancy is improved, but dielectric properties change significantly after moisture absorption due to hydrolysis
Solution Approach 1:
The patent changes the chemical structure parameters by replacing the DOPO molecular framework with a phosphorus-containing polycyclic aromatic hydroxy compound having a specific molecular structure (formula 1). This structural parameter change eliminates the hydrolysis issue while maintaining flame retardancy and improving dielectric property stability after moisture absorption.
Solution Approach 2:
The patent creates a composite curing agent system by combining phosphorus-containing polycyclic aromatic hydroxy compound with epoxy resin. This composite material approach achieves both flame retardancy and stable dielectric properties by integrating the phosphorus compound into the epoxy resin matrix, preventing hydrolysis while maintaining performance.
2Reliability
If phosphorus-based flame retardants are added to achieve flame retardation, then flame retardancy is improved, but processability decreases due to bleed-out
Solution Approach 1:
The patent merges the flame retardant function with the curing agent function by using phosphorus-containing polycyclic aromatic hydroxy compound as a curing agent for epoxy resin. This combination eliminates the need for separate additive flame retardants, preventing bleed-out while maintaining both flame retardancy and processability.
Solution Approach 2:
The phosphorus-containing polycyclic aromatic hydroxy compound serves multiple functions simultaneously: it acts as both a curing agent for epoxy resin and a flame retardant. This multi-functionality eliminates the trade-off between flame retardancy and processability by integrating both functions into a single component.
3Reliability
If inorganic-based flame retardants are added in large amounts to achieve sufficient flame retardation, then flame retardancy is improved, but various properties of plastic molded products decrease
Solution Approach 1:
The patent changes the flame retardant type from inorganic-based to phosphorus-containing organic compound with specific molecular structure. This parameter change allows achieving sufficient flame retardancy with small addition amounts, thereby preserving the mechanical properties of the molded products.
4Reliability
If halogen-based flame retardants are used to achieve flame retardation, then flame retardancy is improved, but carcinogenic dioxins are generated
Solution Approach 1:
The patent eliminates the harmful effect of halogen-based flame retardants by replacing them with phosphorus-containing compounds. This substitution converts the harmful chemical composition into a beneficial eco-friendly alternative that provides flame retardancy without generating carcinogenic dioxins, aligning with environmental protection requirements.
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 achieves excellent flame retardancy, heat resistance, and stable dielectric properties with minimal moisture absorption, making it suitable for high-frequency electronic devices by maintaining low transmission loss and property stability.
Implementation Method 1
the DOPO molecular framework is prone to hydrolysis, resulting in a significant change of dielectric properties after moisture and water absorption due to a hydroxyl group produced by the hydrolysis
Data Source
Figure 1
AI summary
Provided is a phosphorus-containing polycyclic aromatic hydroxy compound that yields a cured product having excellent flame retardancy, heat resistance, and dielectric properties, in which the compound has a low water absorption rate and dielectric properties that has a low change after water absorption. A phosphorus-containing polycyclic aromatic hydroxy compound characterized by being represented by general formula (1), wherein, in general formula (1), m is an integer of 1 to 20; n1 is each independently an integer of 1 to 4; and Ar is each independently an aromatic ring having 6 to 30 carbon atoms (excluding a benzene ring) optionally having a substituent, R1 is each independently hydrogen, a linear or branched alkyl group having 1 to 5 carbon atoms, or a substituent represented by general formula (2), provided that at least one R1 comprises a structure of the general formula (2), X represents a linking group and is each independently oxygen, sulfur, a substituted or unsubstituted cycloalkylene having 3 to 20 carbon atoms; or a substituted or unsubstituted aralkylene having 8 to 32 carbon atoms.