Phosphorus Polyester Flame Retardant Compatibility
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Phosphorus-based flame retardants, particularly those containing DOPO, exhibit poor compatibility with non-polar solvents and radiation-curable materials, leading to uneven distribution and separation issues in coatings, restricting their application.
Innovation Solution
A modified phosphorus-containing unsaturated polyester is synthesized by polymerizing diol, unsaturated anhydride or acid, and (10-(2,5-dicarboxypropyl)-9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, and modifying it with epoxy acrylate or epoxy silicon-containing compounds, enhancing compatibility and cross-linking capabilities with radiation-curable materials and non-polar solvents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If phosphorus-based flame retardant containing DOPO is used, then flame resistance and thermal stability are improved, but compatibility with non-polar solvent and radiation-curable material deteriorates
Solution Approach 1:
The patent creates a composite material by grafting DOPO-containing polyester chains onto a polyurethane backbone. This composite structure combines the flame-retardant properties of DOPO with the compatibility and mechanical properties of polyurethane, resolving the contradiction between flame resistance and compatibility with non-polar solvents and radiation-curable materials.
Solution Approach 2:
The patent modifies the chemical structure parameters of the flame retardant by introducing specific functional groups (hydroxyl, carboxyl) and controlling the molecular weight and composition ratios. These parameter changes enhance compatibility with non-polar solvents and radiation-curable materials while maintaining flame resistance through the preserved DOPO core structure.
2Reliability
If halogen-based flame retardant is used, then flame resistance and ease of use are improved, but environmental pollution and harmful gas generation worsen
Solution Approach 1:
The patent converts the traditionally harmful halogen-based approach into a beneficial phosphorus-based system. By using DOPO (9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide) as the core structure, the invention achieves comparable or superior flame resistance without the environmental pollution and toxic gas generation associated with halogen compounds, thus converting a harmful chemical pathway into a beneficial one.
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 modified polyester demonstrates improved compatibility with styrene and non-polar solvents, allowing for uniform distribution and adhesion, and provides enhanced flame resistance through phosphorus and silicon synergies, expanding its application scope.
Implementation Method 1
modifying it with epoxy acrylate or epoxy silicon-containing compounds
Implementation Method 2
cross-linkedly polymerized with the radiation-curable material/monomer
Data Source
AI summary
The present invention is directed to a flame-retardant polyester having a structure of formula (I):where each A′ is, independently, a residue of a diol, each B′ and each B″ may be identical or different and are, independently, a residue of a saturated or unsaturated anhydride or acid, and C′ and C″ may be identical or different and are independently selected from hydrogen, a residue of an epoxy acrylate compound or a residue of an epoxy silicon-containing compound, with the proviso that C′ and C″ are not both hydrogen, where a is an integer of from 1 to 30, b is an integer of from 1 to 30, and c is an integer of from 1 to 15, and where the flame-retardant polyester has an acid value of from 20 to 40. The present invention is also directed to a process for preparing the flame-retardant polyester and a composition including the same.