Aerosol Primer Composition Preventing Phase Separation
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Solution Overview
Problem
Formulating aerosol primer compositions that prevent phase separation and coagulation when combined with propellants, which can lead to inconsistent dispensing and clogging of the dispensing system, making it difficult to achieve uniform coatings on substrates.
Innovation Solution
An aerosol primer composition comprising a film forming component with polyurethane or alkyd, cellulosic particles, and an aqueous solvent system, combined with dimethyl ether as a propellant, which allows for a single liquid phase dispersion and prevents phase separation, ensuring consistent atomization and uniform coating application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a coating composition is combined with a propellant under high pressure to form an aerosol spray, then the product can be applied as a mist without brushes or applicators, but phase separation and coagulation occur resulting in incomplete atomization and inconsistent spray
Solution Approach 1:
The patent modifies the chemical and physical parameters of the coating composition by incorporating specific surfactants and controlling the molecular weight distribution of the coating material. These parameter changes enable the composition to remain stable under high pressure with the propellant while still achieving proper atomization, preventing phase separation without compromising spray consistency.
Solution Approach 2:
The patent introduces surfactants as intermediary substances that mediate between the coating composition and the propellant. These surfactants act as compatible agents that prevent direct phase separation between the coating material and propellant, allowing both to coexist stably in the aerosol formulation while maintaining proper atomization characteristics.
2Ease of operation
If a coating composition is combined with a propellant under high pressure, then aerosol spray can be generated, but coagulation results in large droplets that negatively affect coating uniformity
Solution Approach 1:
The patent adjusts critical parameters including the molecular weight distribution of the coating material and the concentration and type of surfactants added. These parameter modifications ensure that the coating composition atomizes properly under aerosol dispensing conditions, producing fine, uniform droplets rather than large coalesced droplets, thereby maintaining coating uniformity while enabling convenient aerosol application.
3Ease of operation
If a coating composition is combined with a propellant under high pressure, then aerosol spray can be generated, but aggregation clogs the dispensing system components
Solution Approach 1:
The patent employs surfactants as intermediary substances that prevent aggregation of coating material particles. These surfactants maintain the coating composition in a stable, non-aggregated state even under the high pressure conditions required for aerosol spray generation, thereby preventing clogging of dispensing system components like valves and spray outlets while still enabling reliable aerosol delivery.
Solution Approach 2:
The patent modifies the physical and chemical parameters of the coating composition, including viscosity, surface tension, and particle size distribution, to prevent aggregation. These parameter changes ensure that the coating material remains in a stable, non-aggregating state during storage and dispensing, preventing clogging of the aerosol system components while maintaining proper spray performance.
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 enables the aerosol primer composition to be dispensed uniformly and consistently, forming a patterned coating that can be easily painted or stained, reducing the need for additional tools and improving the aesthetic appearance of substrates.
Implementation Method 1
The propellant evaporates as the primer composition is dispensed from the pressurized container
Implementation Method 2
the turbulence created in the channels of the actuator causes the atomization of the paint
Data Source
AI summary
An aerosol primer composition includes a film forming component and a propellant component. The film forming component includes (by weight of the composition): (a) at least one of a polyurethane and alkyd from about 10% to about 20%, (b) cellulosic particles from about 2% to about 5%, and (c) an aqueous solvent system from about 20% to about 40%. The propellant component includes dimethyl ether. The aerosol primer composition can be stored within a spray assembly and the propellant component can be configured to pressurize the film forming component for dispensing from the spray assembly as an aerosol. The aerosol primer composition can be used to prime a substrate to be painted or stained.