Semi-transparent UV-blocking Release Film for Waterproof Membranes
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional waterproof membranes face challenges in UV/Vis radiation sensitivity, leading to adhesive degradation and reduced adhesion strength, and existing semi-transparent release films offer insufficient protection, hindering effective sealing of buildings against water ingress while maintaining visibility of installation markings.
Innovation Solution
A composite structure featuring a release film with a polyolefin or ethylene copolymer base, incorporating titanium dioxide as an inorganic pigment and organic pigments like 3,3'-(1,4-phenylenediimino)-bis(4,5,6,7-tetrachloro)-1H-isoindol-1-one, along with UV stabilizers, providing high UV protection and sufficient visible light transmission to preserve adhesive strength and visibility of markings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If opaque release films are used to protect adhesive from UV/Vis radiation, then adhesive strength is maintained, but visibility of application markings is lost
Solution Approach 1:
The release film is divided into multiple layers with distinct functions: the first layer (50-100 μm thick) provides UV protection while maintaining visibility, and the second layer serves as the release surface. This segmentation allows each layer to be optimized for its specific function, resolving the contradiction between protection and visibility.
Solution Approach 2:
The release film uses a composite structure combining polyolefin or ethylene copolymer base material with specific pigment combinations (titanium dioxide as inorganic pigment and organic pigments like Yellow 110). This composite material composition achieves both UV radiation protection and visible light transmission, simultaneously maintaining adhesive strength and marking visibility.
2Loss of information
If thin release films are used to maintain visibility, then marking visibility is improved, but UV protection capability is reduced
Solution Approach 1:
The film thickness is precisely controlled within the range of 50-100 μm, which is thicker than conventional single-layer films but still maintains good visibility. This parameter optimization, combined with the specific pigment composition (2-10 parts TiO2, 0.2-6 parts organic pigment per 100 parts polymer), achieves the optimal balance between UV protection and visibility.
3Reliability
If release films with high UV protection are used, then adhesive strength is maintained, but visible light transmission is reduced
Solution Approach 1:
Different regions of the release film have different optical properties optimized for their function: the first layer contains higher concentrations of UV-absorbing pigments (titanium dioxide and organic pigments) to block UV radiation, while still allowing visible light transmission. The pigment distribution and concentration are locally optimized to achieve both UV protection and visibility.
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 effectively protects pressure-sensitive adhesives from UV/Vis radiation, maintaining adhesive strength over extended periods and ensuring clear visibility of markings, thereby ensuring reliable and efficient sealing of buildings against water.
Implementation Method 1
the release film is characterized in that it has a transmission in percent in the range of 500 to 700 nm between 5 and 20% and a transmission in the range of 300 to 500 nm of less than 10%
Implementation Method 2
the adhesive would be deactivated by photo-oxidative processes, leading to a significant reduction in adhesive strength
Implementation Method 3
exhibits sufficient transmission in the visible light range so that colored markings on a substrate are visible through the release film
Data Source
AI summary
The invention relates to a separating film based on polyolefins or ethylene copolymers with a content of organic and optionally inorganic pigment and at least one UV stabilizer. The separating film has a transmission percentage between 5 and 20% in the range from 400 to 700 nm and a transmission percentage of < 2% in the range from 300 to 500 nm. Such separating films have the advantage that marking regions applied onto membranes which can be found below the separating film remain detectable, and adhesives which can be found below the separating film are effectively protected from UV light and premature aging by the addition of inorganic and organic pigments and UV stabilizers. The invention further relates to composite structures of corresponding separating films and adhesives, to water-tight membranes with coatings made of adhesive and separating films, and to uses of corresponding membranes for sealing structures against water.