Scratch Resistant UV Blocking Glass Coating
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Solution Overview
Problem
Current UV blocking glass coatings that are scratch and abrasion resistant are inadequate for art display applications, as they require careful handling and are not sufficiently resistant to scratching during cutting and assembly of picture frames.
Innovation Solution
A hybrid inorganic-organic glass coating is developed using an inorganic polysiloxane polymer matrix with tetraethylorthosilicate (TEOS) and a UV absorber, such as benzophenone, coupled with a bi-functional silanol coupling agent, which is applied using a solvent like 2-propoxyethanol and cured at temperatures below 230°C to achieve both high scratch resistance and effective UV blocking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If organic polymer coatings are used for UV blocking, then UV radiation is efficiently blocked, but the coating becomes soft and scratch easily
Solution Approach 1:
The patent applies composite materials by combining organic polymer matrix with inorganic ceramic oxide particles to create a hybrid coating that exhibits both UV blocking properties from the organic component and scratch resistance from the inorganic component, resolving the contradiction between softness and UV protection
2Strength
If inorganic materials are used for scratch resistance, then the coating becomes hard and scratch resistant, but UV blocking efficiency is reduced and yellow appearance occurs
Solution Approach 1:
The patent combines inorganic ceramic oxide particles for hardness with organic polymer matrix containing UV absorbers, creating a composite coating that achieves both scratch resistance and effective UV blocking without the yellowing problem of pure inorganic coatings
3Strength
If hybrid sol gel coatings with MTMS binder are used, then scratch resistance and UV blocking are improved, but the coating requires careful handling and is not sufficiently resistant during cutting and assembly
Solution Approach 1:
The patent modifies the chemical composition parameters of the hybrid sol gel coating by adjusting the ratio of ceramic oxide particles to polymer matrix and selecting specific ceramic materials, thereby enhancing scratch resistance to levels that tolerate cutting and assembly operations while maintaining UV blocking 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 coating provides at least 97% UV protection without affecting the transmitted color and is resistant to scratching, allowing for easier handling and assembly of coated glass products in art display applications.
Implementation Method 1
heating the second blend to a first elevated temperature such that the bi-functional silane coupling agent hydrolyzes to form a mixture of colloidal silica and a first silanol
Implementation Method 2
adding tetraethylorthosilicate (TEOS) to the mixture over a period of time to hydrolyze the TEOS to form a third blend of a second silanol, the first silanol, and the colloidal silica
Implementation Method 3
The UV coatings can include a UV absorber that has compounds to absorb radiation of wavelengths starting in the near visible portion of the electromagnetic spectrum, which has a wavelength of around 400 nanometers, to the so-called vacuum ultraviolet portion of the spectrum, which can travel through a vacuum but is blocked by air and has a wavelength of around 200 nanometers in wavelength
Implementation Method 4
These UV compounds can be used to protect items underlying transparent, semitransparent, and/or translucent substrates from the degradative effects of ultraviolet radiation absorption
Data Source
AI summary
A coating composition and method of making a scratch resistant UV blocking glass coating is described. The composition can include an aqueous colloidal silica. a bifunctional silanol coupling agent, tetraethylorthosilicate (TEOS), a UV absorber, and a water miscible solvent selected from glycol ethers, alkanols, keto alcohols, and combinations thereof. The molar ratio of the bi-functional silanol to TEOS is selected to provide scratch resistance coupled with water resistance.