Controlled-Particle Hypophosphite Flame Retardant for Thin Adhesives
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Solution Overview
Problem
Existing flame retardants, particularly halogen-based compounds, pose environmental and health risks, and phosphorus-based alternatives lack sufficient flame retardancy and heat resistance, with particle size issues limiting their application in various fields.
Innovation Solution
A method for manufacturing a hypophosphorous acid-based flame retardant with controlled particle size distribution, using alkali metal hypophosphite and divalent to tetravalent metal salts, via a nozzle, ensuring particle sizes between 0.1 < D50 / (D98 - D50) < 0.6 and a heat stability of 250°C < TCG < 320°C, suitable for different applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If halogen-based flame retardants are used, then flame retardancy and heat resistance are improved, but toxicity and environmental harm increase
Solution Approach 1:
The patent changes the chemical composition parameters by using phosphorus-based compounds with specific molecular structures (phosphinate, phosphonate, or phosphite groups) instead of halogen-based compounds. This parameter change maintains flame retardancy while eliminating the toxic effects of halogen release during combustion.
Solution Approach 2:
The patent employs composite flame retardant systems combining phosphorus-based compounds with metal salts (divalent to tetravalent metals). This composite approach enhances both flame retardancy and heat resistance while maintaining environmental compatibility, achieving performance comparable to halogen-based systems without the toxicity.
2Object-affected harmful factors
If phosphorus-based flame retardants are used, then environmental compatibility is improved, but flame retardancy and heat resistance deteriorate
Solution Approach 1:
The patent modifies the molecular structure parameters of phosphorus-based compounds by introducing specific functional groups (phosphinate -P(=O)(OH)OR, phosphonate -P(=O)(OH)2, or phosphite -P(=O)(OH)R2) and optimizing the R group configurations. These parameter changes significantly enhance flame retardancy and heat resistance while maintaining environmental compatibility.
Solution Approach 2:
The patent creates composite materials by combining phosphorus-based flame retardants with metal salts (Ca, Mg, Al, Zn, Ti, etc.). This composite structure synergistically improves flame retardancy and heat resistance to levels comparable with halogen-based systems, while preserving the environmental benefits of phosphorus-based compounds.
3Area of stationary object
If flame retardant particle size is reduced, then dispersibility in thin adhesive layers is improved, but feeding smoothness deteriorates due to bridge formation
Solution Approach 1:
The patent optimizes the particle size parameter of the flame retardant to a specific range (D50: 3-15 μm, D98: 45-90 μm). This parameter optimization balances dispersibility in thin adhesive layers with feeding smoothness, preventing both aggregation in thin coatings and bridge formation in feeding hoppers.
Solution Approach 2:
The patent employs dynamic particle size distribution control during manufacturing, creating a controlled distribution rather than uniform particles. This dynamic approach ensures optimal performance across different application conditions, maintaining both dispersibility and feeding smoothness.
4Ease of operation
If flame retardant particle size is increased, then feeding smoothness is improved, but dispersibility in thin adhesive layers deteriorates
Solution Approach 1:
The patent precisely controls the particle size parameter within the optimal range (D50: 3-15 μm, D98: 45-90 μm). This parameter control ensures particles are small enough to disperse in thin adhesive layers (30 μm or less) while large enough to prevent bridge formation during feeding, resolving the contradiction between feeding smoothness and dispersibility.
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 method allows for the production of a flame retardant with excellent flame retardancy and heat resistance, suitable for adhesive compositions requiring thinness or heat resistance, without impairing product properties, and with controlled particle sizes for improved dispersibility and processing.
Implementation Method 1
at least one raw material of a metal alkyl hypophosphite and a divalent to tetravalent metal salt is supplied through a nozzle
Data Source
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AI summary
The present invention relates to a hypophosphorous acid-based flame retardant and a method for manufacturing same, the method for manufacturing a hypophosphorous acid-based flame retardant having a controlled particle size due to divalent to tetravalent metal salt supplied through a nozzle. The hypophosphorous acid-based flame retardant having a controlled particle size according to the present invention can provide excellent flame retardancy to adhesive compositions requiring thinness without harming the physical properties of a product or flame retardant compositions requiring heat resistance.