UV-Cured Dual-Layer Coating on Non-Woven Facers to Reduce Porosity
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Solution Overview
Problem
There is a need for non-woven facers in construction boards with improved properties such as abrasion resistance and reduced porosity, which are not adequately addressed by existing UV-curable coatings.
Innovation Solution
A UV-cured coated facer is developed, comprising a non-woven mat with an intermediate coating containing a binder and a filler, topped by a UV-curable coating composition that is essentially free of fillers, using a process that includes applying the UV-curable coating and curing it with a light source.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a UV-curable coating composition containing filler is applied to non-woven facers, then the coating provides some protective properties, but the porosity remains high and abrasion resistance is insufficient
Solution Approach 1:
The coating system is divided into two distinct layers: an intermediate coating layer containing filler particles that provides porosity and breathability, and a top UV-curable coating layer that is essentially free of filler and provides abrasion resistance. This segmentation allows each layer to perform its specific function optimally without compromising the other.
Solution Approach 2:
The invention uses a composite coating structure combining an intermediate coating (with binder and filler) and a UV-curable top coating (essentially filler-free). This composite approach integrates the benefits of both filled coatings (porosity, breathability) and clear UV coatings (hardness, abrasion resistance) into a single facer product.
2Ease of manufacture
If traditional heat-cured aqueous coatings are used on non-woven facers, then the coating process is simple, but the porosity increases and abrasion resistance decreases
Solution Approach 1:
The invention replaces the traditional heat-curing mechanism with UV光固化 technology. Instead of using thermal energy to cure the coating, a UV-curable coating composition is applied and then cured using ultraviolet light, which provides faster curing and better preservation of the non-woven mat's properties including porosity and abrasion resistance.
Solution Approach 2:
The invention changes the curing parameter from thermal (heat) to photonic (UV light). This parameter change allows the coating to cure at lower temperatures that don't damage the non-woven mat structure, preserving porosity while achieving adequate abrasion resistance through the UV-cured top layer.
3Device complexity
If UV-curable coating is applied directly without intermediate coating, then the process is simplified, but the coating adhesion and porosity control are compromised
Solution Approach 1:
The invention introduces an intermediate coating layer as a mediator between the non-woven mat and the UV-curable top coating. This intermediate layer, containing binder and filler, provides a suitable surface for UV coating adhesion while maintaining the porosity and breathability of the facer. The intermediate layer acts as a bridge that ensures proper bonding without compromising the functional properties.
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 results in a facer with excellent scratch resistance and high air resistance, reducing porosity and enhancing the durability of construction materials like gypsum and foam boards.
Implementation Method 1
UV-curable coating composition... supplying a light source to cure the UV-curable coating composition
Data Source
AI summary
A UV-cured coated facer includes a non-woven mat having a first side and a second side and an intermediate coating disposed on the first side of the non-woven mat. The intermediate coating includes a coating binder and a filler. The UV-cured coated facer also includes a UV-curable coating composition disposed on the intermediate coating, wherein the UV-curable coating composition is essentially free of a filler.