Aqueous Roller Coating Composition for Homogeneous Film Formation
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Solution Overview
Problem
Existing metallic surface treatment compositions for rollers result in inhomogeneous films and increased roller roughness due to high temperature residues, leading to frequent roller replacement and compromised performance in repaintability, corrosion resistance, and resistance to solvents and alkali.
Innovation Solution
An aqueous composition comprising 10-35% acrylic resin, 0.1-4% film-forming aid, 1-8% lubricant, and 0.1-1% water-soluble chromium compound, designed for roller application, which forms a homogeneous film with reduced adhesion to rollers, enhancing performance in high temperature, corrosion, and solvent resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional compositions are used for roller application at high temperatures, then film formation occurs, but the films become inhomogeneous and roller roughness increases
Solution Approach 1:
The composition uses a specific acrylic resin with controlled molecular weight distribution and composition, along with precise formulation of additives (silane-modified polyester resin, fluorinated surfactant, silica particles) to maintain film-forming capability at high temperatures while preventing residue accumulation and roughness increase on rollers
Solution Approach 2:
The invention employs a composite formulation combining acrylic resin with silane-modified polyester resin, fluorinated surfactant, and colloidal silica particles. This composite system provides both homogeneous film formation and reduced adhesion to roller surfaces, preventing the roughness and inhomogeneity problems associated with conventional single-component compositions
2Manufacturing precision
If roller treatment is performed frequently to maintain surface quality, then film homogeneity is maintained, but productivity decreases due to operational interruptions
Solution Approach 1:
The composition includes fluorinated surfactant and specific colloidal silica particles that provide excess lubricity and anti-adhesion properties beyond what is minimally required. This excessive action prevents residue buildup that would otherwise necessitate frequent roller cleaning or replacement, thereby maintaining film homogeneity while reducing maintenance frequency and maximizing productivity
3Productivity
If composition adhesion to rollers is increased for better film transfer, then coating efficiency improves, but roller lifespan decreases due to residue buildup and roughness
Solution Approach 1:
The fluorinated surfactant and colloidal silica particles act as intermediary substances that facilitate composition transfer to the metal substrate while simultaneously preventing strong adhesion to the roller surface. This intermediary action enables efficient coating transfer without the composition residues that would otherwise accumulate on rollers, reducing roughness and extending roller lifespan while maintaining coating efficiency
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 composition extends roller lifespan, ensures homogeneous film formation, and provides excellent repaintability, corrosion resistance, and resistance to high temperature, darkening, alkali, boiling water, and solvents.
Implementation Method 1
forming a film onto metallic surface after the solvent of the aqueous composition is evaporated
Implementation Method 2
contacting metallic surface with the invented aqueous composition
Data Source
AI summary
Disclosed herein is an aqueous composition including components (A) from 10% to 35% by weight of acrylic resin without hydroxyl group, where the acrylic resin has an average particle diameter in a range of from 50 μm to 200 μm measured by dynamic light scattering according to ISO13321:2004, (B) from 0.1% to 4% by weight of a film-forming aid having a boiling point of no more than 300° C. under 1 atm, (C) from 1% to 8% by weight of a lubricant having an average particle diameter in a range of from 100 nm to 600 nm measured by dynamic light scattering according to ISO13321:2004, and (D) from 0.1% to 1% by weight of a water-soluble chromium compound, where its weight is calculated from the chromium element, and the weight percentages of all components are based on the total weight of the aqueous composition.