Multilayer PVC Coating Barrier Layer for Contaminant Migration
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
PVC-based surface coatings are permeable to substances, leading to degradation and aesthetic issues, and existing barrier layers are not compatible with recycling processes or effective in preventing contaminant migration.
Innovation Solution
A multilayer surface coating with a polyvinyl alcohol-based barrier layer incorporating a silane compound, which improves adhesion to PVC and prevents contaminant migration, while being compatible with recycling processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a polyurethane protective varnish is applied to the surface of PVC coating, then the permeability to substances is reduced, but contaminants still migrate through the coating layers causing degradation
Solution Approach 1:
The coating system is divided into distinct functional layers: a PVC-based wear layer, a polyvinyl alcohol barrier layer (1-10 μm thick) specifically designed to block contaminant migration, and a polyurethane protective varnish for surface protection. This segmentation allows each layer to address specific problems - the barrier layer prevents contaminant migration while the varnish provides surface protection.
Solution Approach 2:
The polyvinyl alcohol barrier layer acts as an intermediary between the PVC wear layer and the external environment. It specifically blocks contaminants such as bituminous substances and adhesives from migrating through the coating, while allowing the PVC layer to maintain its decorative and mechanical functions.
2Reliability
If polyester or polyamide barrier layers are used to prevent yellowing and maintain mechanical performance, then the barrier function is achieved, but recycling of the PVC-based coating becomes difficult or impossible
Solution Approach 1:
The barrier layer material is changed from polyester or polyamide to polyvinyl alcohol, which has comparable barrier properties against yellowing and contaminant migration but is fully compatible with PVC recycling processes. This parameter change in material composition resolves the contradiction between performance and recyclability.
Solution Approach 2:
The use of polyvinyl alcohol as the barrier layer material enables the entire coating system to be recycled through conventional PVC recycling processes. The barrier layer can be discarded and recovered along with the PVC substrate, unlike polyester or polyamide layers that require special treatment incompatible with standard PVC recycling.
3Reliability
If a film barrier layer of 10-20 μm thickness is applied to prevent contaminant migration, then the barrier function is improved, but the manufacturing complexity increases due to the required doubling step
Solution Approach 1:
The barrier function is achieved using a thin film of polyvinyl alcohol (1-10 μm) applied directly to the PVC layer, eliminating the need for doubling thick films. This thin film approach maintains effective contaminant migration prevention while simplifying the manufacturing process and avoiding the complexity of the doubling step.
4Reliability
If polyvinyl alcohol is used as the barrier layer material, then the barrier properties are improved, but the adhesion to PVC layers with fillers is poor
Solution Approach 1:
The barrier layer is formulated as a composite material consisting of polyvinyl alcohol combined with specific additives and plasticizers that enhance adhesion to PVC substrates containing inorganic fillers. This composite approach maintains the superior barrier properties of polyvinyl alcohol while resolving the adhesion problem through chemical and physical modifications of the material composition.
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 coating maintains mechanical performance and aesthetic appearance over time, prevents contaminant migration, and allows for easy recycling of PVC-based coatings.
Implementation Method 1
a barrier layer comprising polyvinyl alcohol and a silane compound, said silane compound comprising at least one amine function
Implementation Method 2
such barrier films are generally only available in 2 or 3.5 meters wide... the passage into the coating of contaminants present on the surface
Data Source
Figure 1~4
Figure 5~6
AI summary
The present invention relates to a multilayer surface coating, including a PVC layer including inorganic fillers, said coating including a barrier layer including polyvinyl alcohol and a silane compound, said silane compound including at least one amine function.