Phosphorous Flame Retardant with Styrene Backbone for Low Dielectric Constant
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Solution Overview
Problem
Conventional flame retardants fail to meet stringent dielectric property requirements for high-fire-resistance applications, particularly in electronic products and power equipment, where both low dielectric constant and high fire resistance are needed.
Innovation Solution
A phosphorous flame retardant with a novel modified structure composed of a styrene functional group and a phosphorus backbone is developed, manufactured through a process involving a reaction between a phenolic functional group-containing retardant and chloromethylstyrene, using butanone as a solvent and potassium iodide, followed by solvent removal and hot pressing to produce a resin sheet with enhanced properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional flame retardants are used to achieve high fire resistance, then fire resistance is improved, but dielectric properties deteriorate (dielectric constant exceeds 3.0)
Solution Approach 1:
The patent employs composite materials by combining phosphorous flame retardant with styrene functional groups and phosphorus backbone structure. This composite approach creates a material that simultaneously achieves high fire resistance (through phosphorous content) and low dielectric constant (through the specific molecular structure with styrene groups), resolving the contradiction between fire resistance and dielectric properties
Solution Approach 2:
The patent applies parameter changes by modifying the molecular structure parameters of the flame retardant. Specifically, it changes the chemical composition to include phosphorous elements with specific functional groups (styrene, phenolic), and adjusts structural parameters (molecular weight, branching) to optimize both fire resistance performance and dielectric constant, achieving values below 3.0 while maintaining high fire safety
2Reliability
If conventional flame retardants are used to meet fire resistance standards, then fire safety is improved, but dielectric loss increases (exceeds 0.0080 at 10 GHz)
Solution Approach 1:
The patent uses composite materials strategy by creating a flame retardant composite with phosphorous backbone and styrene functional groups. This specific composite structure reduces dielectric loss by optimizing the molecular arrangement and reducing polarizability, while maintaining effective fire protection through the phosphorous content, achieving dielectric loss below 0.0080 at 10 GHz
Solution Approach 2:
The patent applies local quality principle by designing specific functional groups (styrene, phenolic) at particular positions within the molecular structure. These localized structural features with specific chemical properties (low polarity, rigid backbone) contribute to reduced dielectric loss in critical frequency ranges, while the overall phosphorous content ensures fire safety performance
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 resulting phosphorous flame retardant exhibits a low dielectric constant and high fire resistance, outperforming conventional additives by achieving a dielectric constant of less than 3.0 and dielectric loss of less than 0.0080 at 10 GHz, suitable for demanding fire-resistant applications.
Implementation Method 1
A retardant containing phenolic functional group and chloromethylstyrene are added to a reaction tank... The phosphorous flame retardant has a chemical structure shown in following Formula (3) or Formula (4)
Implementation Method 2
The solvent is drained and placed in an oven after stirring to produce a phosphorous flame retardant... a temperature of the oven is 80° C. to 120° C., and a storage time in the oven is 1 hour to 6 hours
Data Source
AI summary
The disclosure provides a phosphorous flame retardant, a product and manufacturing methods thereof, and the phosphorous flame retardant has the chemical structure shown in the following Formula (3) or Formula (4):In Formula (3), Y is H, F, Cl, or Br.