Powder Coating for Household Appliance Coiled Material
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current powder coating materials for household appliance coiled materials fail to meet the requirements for thickness, flexibility, impact resistance, and T-bend performance, and are environmentally harmful due to the use of oil-based liquid coatings and VOCs.
Innovation Solution
A powder coating material comprising modified polyester resin, curing agents, silicates, fillers, pigments, and auxiliary agents, with specific formulations and preparation methods to enhance adhesion, flexibility, and solvent resistance, allowing for rapid curing and improved coating performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If powder coating material is applied to achieve thick coating (45 to 80 μm) for household appliance coiled material, then coating thickness requirement is met, but flexibility and T-bend performance deteriorate
Solution Approach 1:
The patent uses a composite resin system combining polyester resin with cycloaliphatic epoxide curing agent and polyisocyanate curing agent. This composite curing system creates a crosslinked network structure that provides both the thickness required (45-80 μm) and the flexibility needed, resolving the contradiction between coating thickness and flexibility by creating a composite material system with balanced properties.
Solution Approach 2:
The patent modifies the chemical composition parameters of the coating material by specifying particular resin types (polyester resin with specific carboxyl value range), curing agents (cycloaliphatic epoxide and polyisocyanate with specific NCO content), and their proportions. These parameter changes enable the coating to achieve both adequate thickness and maintained flexibility through optimized molecular structure and crosslinking density.
2Quantity of substance
If powder coating material is applied to achieve thick coating (45 to 80 μm) for household appliance coiled material, then coating thickness requirement is met, but T-bend performance deteriorates
Solution Approach 1:
The patent employs a composite curing agent system combining cycloaliphatic epoxide and polyisocyanate, which creates a balanced crosslinked network that maintains T-bend performance even at thick coating levels (45-80 μm). The synergistic interaction between different curing agents produces a coating structure that is both thick and bendable, resolving the contradiction between thickness and T-bend performance.
Solution Approach 2:
The patent optimizes specific parameters including carboxyl value of polyester resin (15-50 mg KOH/g), NCO content of polyisocyanate (15-30%), and the ratio of curing agents. These parameter adjustments create a coating formulation that achieves the required thickness while preserving T-bend performance through controlled crosslinking density and molecular flexibility.
3Strength
If powder coating material is applied to achieve high hardness for household appliance coiled material, then hardness requirement is met, but flexibility and T-bend performance deteriorate
Solution Approach 1:
The patent creates a composite curing system that balances hardness and flexibility by combining cycloaliphatic epoxide (providing hardness through dense crosslinking) with polyisocyanate (providing flexibility through flexible urethane linkages). This composite approach allows the coating to achieve high hardness while maintaining flexibility and T-bend performance, resolving the contradiction between these opposing properties.
Solution Approach 2:
The patent carefully controls the ratio and content of curing agents, specifying NCO content (15-30%) and carboxyl value (15-50 mg KOH/g), to optimize the balance between hardness and flexibility. By adjusting these chemical parameters, the coating achieves high hardness necessary for bump resistance while maintaining the flexibility required for household appliance applications.
4Ease of manufacture
If oil-based liquid coating material is used for coating coiled material, then coating process is established, but environmental pollution and health harm worsen due to VOC emissions
Solution Approach 1:
The patent fundamentally changes the physical state parameter of the coating material from liquid (oil-based) to powder form. This parameter change eliminates the need for organic solvents and VOC emissions while maintaining a viable coating process through powder application and curing technology, resolving the contradiction between manufacturability and environmental protection.
Solution Approach 2:
The patent replaces the chemical solvent-based coating system with a powder-based system that uses mechanical powder delivery and thermal/catalytic curing. This substitution eliminates the harmful chemical vapor phase (VOCs) while maintaining the coating function through a different physical-chemical mechanism, achieving both ease of manufacture and environmental friendliness.
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 solution provides a powder coating material with enhanced flexibility, impact resistance, and T-bend performance, meeting the thickness requirements of household appliance coiled materials while being environmentally friendly and energy-efficient, with reduced VOC emissions and lower production costs.
Implementation Method 1
a powder coating material comprising modified polyester resin, curing agents, silicates, fillers, pigments, and auxiliary agents, with specific formulations and preparation methods to enhance adhesion
Implementation Method 2
allowing for rapid curing and improved coating performance
Data Source
AI summary
Provided are a powder coating material for household appliance coiled material and a preparation method thereof. The powder coating material comprises: a polyester resin, a curing agent, a silicate, a filler, a pigment, and an auxiliary agent. The powder coating material for the household appliance coiled material not only can meet the requirements of coating processes of the coiled material, but also has excellent performances such as flexibility, T-bend performance, impact resistance and solvent resistance, while satisfying the requirement for the thick coatings of the household appliance coiled material.