Aqueous Coating Composition for Plastic Substrates Without Preheating
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing aqueous primer compositions for multilayer coating films on plastic materials face challenges with moisture resistance, especially when the primer coating film is thick or when using an aqueous base coat for top-coat, leading to decreased moisture resistance and potential layer mixing without preheating.
Innovation Solution
An aqueous coating composition containing a specific blocked polyisocyanate compound, combined with a modified polyolefin and an aqueous acrylic resin, which forms a multilayer coating film with superior adhesion, finish quality, and moisture resistance without preheating, even under low-temperature baking conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the film thickness of the primer is reduced to accelerate drying, then productivity is improved, but manufacturing precision deteriorates due to defective film formation
Solution Approach 1:
The patent changes the chemical composition parameters of the primer by incorporating specific ratios of polyolefin resin (10-40 parts), acrylic resin (60-90 parts), and crosslinking agent (1-10 parts) to enable rapid drying without compromising film formation quality. This compositional adjustment allows the coating to dry faster while maintaining proper film integrity and appearance.
2Use of energy by stationary object
If preheating is eliminated to save space and energy, then use of energy is improved, but reliability deteriorates due to layer mixing and defective finish quality
Solution Approach 1:
The patent applies preliminary action by incorporating a crosslinking agent into the primer composition that enables the coating to undergo crosslinking reactions during the top-coat baking process itself. This preliminary preparation of the primer composition allows it to achieve proper adhesion and film formation without requiring separate preheating, eliminating the need for additional energy input while ensuring reliable finish quality.
3Use of energy by stationary object
If preheating is eliminated to save space and energy, then use of energy is improved, but reliability deteriorates due to poor moisture resistance
Solution Approach 1:
The patent changes the chemical parameters by selecting specific resin combinations and crosslinking agents that promote thorough crosslinking during the top-coat curing process. This compositional modification ensures that the primer achieves adequate moisture resistance through the crosslinking reaction initiated during top-coat baking, eliminating the need for preheating while maintaining reliable moisture protection.
4Object-generated harmful factors
If aqueous primer is used to improve safety and environmental protection, then object-generated harmful factors are reduced, but reliability deteriorates due to layer mixing and defective finish quality when top-coating without preheating
Solution Approach 1:
The patent adjusts the chemical composition parameters of the aqueous primer by incorporating specific ratios of polyolefin resin, acrylic resin, and crosslinking agent. This compositional optimization enables the aqueous primer to achieve proper film formation and adhesion during the top-coat baking process without requiring preheating, thereby maintaining environmental benefits while ensuring reliable finish quality.
5Object-generated harmful factors
If aqueous primer is used to improve safety and environmental protection, then object-generated harmful factors are reduced, but reliability deteriorates due to poor moisture resistance with thick films
Solution Approach 1:
The patent modifies the chemical composition parameters by incorporating a crosslinking agent (1-10 parts) into the aqueous primer formulation. This compositional change enables the primer to achieve adequate moisture resistance through crosslinking reactions during top-coat curing, even when applied as thick films, thereby maintaining environmental advantages while improving moisture protection reliability.
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 ensures superior adhesion and finish quality while maintaining moisture resistance and preventing layer mixing, even in subsequent top-coating steps without preheating, enhancing the durability and performance of the multilayer coating film.
Implementation Method 1
an aqueous coating composition containing a specific blocked polyisocyanate compound, combined with a modified polyolefin and an aqueous acrylic resin, which forms a multilayer coating film with superior adhesion, finish quality, and moisture resistance
Implementation Method 2
forms a multilayer coating film that demonstrates superior adhesion to a plastic base material as well as superior finish quality and moisture resistance without preheating after coating
Data Source
AI summary
The objective of the present invention is to provide: an aqueous coating composition which has excellent adhesiveness to a plastic substrate and which is capable of forming a multilayer coating film, which has excellent finishing property and water resistance and in which mixing of the layers does not occur even when preheating is not conducted after coating and the next process of applying a finishing coat is performed thereafter; and a coating method using the composition. This aqueous coating composition is characterized by comprising an aqueous dispersion of a modified polyolefin (A), an aqueous acrylic resin (B) and a blocked polyisocyanate compound having a specific blocked isocyanate (C).