Layered Composite Coatings for Flame Retardancy Without Mechanical Loss
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Solution Overview
Problem
Traditional flame retardants for polymers, such as halogen-containing and intumescent flame retardants, pose environmental and health risks, and high addition amounts lead to mechanical property deterioration.
Innovation Solution
A composite coating composed of alternating layers of electropositive and electronegative water-soluble polymer compounds, optionally including M(OH)(OCH3), which forms an inorganic protective layer to enhance flame retardancy and heat insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If intumescent flame retardants are added to polymers to improve flame retardancy, then flame retardancy is improved, but mechanical properties deteriorate due to high addition amounts
Solution Approach 1:
The flame retardant system is segmented into multiple functional layers: a base polymer layer and a flame-retardant coating layer applied thereon. This segmentation allows the flame retardant components to be concentrated in the coating layer rather than dispersed throughout the bulk polymer, thereby achieving effective flame protection without compromising the mechanical integrity of the base polymer material.
Solution Approach 2:
The invention transitions from volumetric flame retardant incorporation (adding flame retardants throughout the polymer bulk) to surface-based flame protection (applying a flame-retardant coating on the polymer surface). This dimensional shift from 3D bulk modification to 2D surface coating reduces the overall amount of flame retardant needed while maintaining effective flame protection.
2Reliability
If halogen containing flame retardants are used to improve flame retardancy, then flame retardancy is improved, but environmental and health harm increases
Solution Approach 1:
The invention changes the chemical composition parameters of the flame retardant system by replacing halogen-containing compounds with halogen-free alternatives in the coating formulation. This parameter change eliminates the harmful environmental and health effects associated with halogen release during combustion while maintaining effective flame retardancy through alternative mechanisms such as char formation and heat barrier properties.
Solution Approach 2:
The invention converts the potential harm of flame retardant decomposition into a beneficial protective effect by designing a coating system that forms a protective char layer during combustion. This char layer acts as a thermal barrier, protecting the underlying polymer from heat and flame, thereby transforming the decomposition process from a harmful event into a protective mechanism.
3Ease of manufacture
If a simple coating structure is used to ease manufacture, then ease of manufacture is improved, but flame retardancy performance is insufficient
Solution Approach 1:
The invention employs a composite coating structure comprising multiple functional components: water-soluble polymer compounds as the coating matrix, metal hydroxide/alkoxide particles as flame retardant agents, and optional crosslinking agents. This composite formulation integrates multiple functions (adhesion, flame protection, heat resistance) into a single coating system that can be applied using simple dip-coating or spray-coating methods, thereby achieving high flame retardancy without compromising ease of manufacture.
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 composite coating significantly improves flame retardancy and heat resistance of polymers without compromising mechanical properties, offering enhanced fire resistance and insulation performance.
Implementation Method 1
Through the strong interaction (such as chemical bond) or weak interaction (such as electrostatic attraction, hydrogen bond, and coordination bond) between the target compound and the functional groups on the surface of the substrate in the polyelectrolyte solution, a multilayered film structure is formed spontaneously and continuously on the substrate
Implementation Method 2
Through the strong interaction (such as chemical bond) or weak interaction (such as electrostatic attraction, hydrogen bond, and coordination bond) between the target compound and the functional groups on the surface of the substrate in the polyelectrolyte solution, a multilayered film structure is formed spontaneously and continuously on the substrate
Data Source
AI summary
The present disclosure belongs to the technical field of flame-retardant polymers, and in particular, to a composite coating and a preparation method and use thereof. The present disclosure provides a composite coating, including n unit coatings arranged in layers, where n≥1. Each of the unit coatings includes a first coating and a second coating arranged in layers in sequence. The first coating and the second coating both include a water-soluble polymer compound. The water-soluble polymer compound includes an electropositive water-soluble polymer compound or an electronegative water-soluble polymer compound. The water-soluble polymer compounds in the first coating and the second coating have opposite electrical properties. The first coating and/or the second coating further include/includes M(OH)(OCH3), where the M includes one or more selected from the group consisting of Co, Ni, Fe, Mg, Al, and Zn. The composite coating provided by the present disclosure has excellent flame retardancy.