Recorded Thursday, March 9 – Presented by Momentive
Momentive has introduced two new organofunctional silanes that offer reactivity with traditional polyurethane coatings. The characteristics of these new silanes appear to expand the utility and methods of use beyond those of traditional silanes in polyurethanes. The use and performance attributes of a low yellowing primary aminosilane and a low odor mercaptosilane will be presented in this webinar.
Benefits in Polyurethane Systems Include:
- Improved scratch resistance
- Easier Incorporation
- Improved corrosion & Impact resistance
Momentive Performance Materials Inc. is a global leader in silicones and advanced materials, with a 75-year heritage of being first to market with performance applications for major industries that support and improve everyday life. The Company delivers science-based solutions by linking custom technology platforms to opportunities for customers.
Download the slides (for Prospector Members only) | Webinar Transcript
Dmitry: Thanks a lot for the introduction. So dear ladies and gentlemen, it’s my pleasure to present a short webinar course which will be dedicated to the application of Momentive’s new silane technologies for modification of the various polyurethane coating systems. So I would like to start the webinar with a short introduction of the silane chemistry, and how this chemistry can be used and is actually used in coatings. So actually, silanes are organofunctional molecules which contain different functionalities and, in our company, we manufacture silanes with amino functionalities, epoxies, vinyl, isocyanato, mercaptan functionalities.
This is functionality on the one side of the molecule, and on the other side of the molecule there’s an organosilicon part, which is typically an epoxy or a methoxy. The organosilicon and organic parts are linked with an organic spacer. Normally, silanes are used in coatings in three different application areas. The first and very big application area is the surface medication. Actually, a lot of pigments and fillers, and extenders that are used in the formulating coating systems, they already contain silanes in the form of modified inorganic particles.
The second application, which is very broad, this is silane as an adhesion promoter. Silanes are known to adhere to inorganic surfaces or to work as a binding agent between organic polymer and inorganic particles, or inorganic surfaces. The third very big application of silanes as coatings is the cross-linking agents, because silanes can react with themselves, making very dense cross-linking networks. In today’s presentation, we’ll demonstrate how silanes can be used to enhance cross-linking and also to enhance adhesion.
So in general, we would like to present two different silane technologies, and I would like to start with a new primary aminosilane, which is called “Silquest A-Link 600” silane. This is a new proprietary technology and we’ll talk a little bit about the value proposition of that product, how it can be used in coatings, which applications, and how it can be introduced into the polyurethane. We’ll demonstrate a couple of high-bake clearcoat systems using A-Link 600 concept, and I’ll also demonstrate how the introduction of A-Link 600 can change the different properties. Especially, we will focus on scratch and mar resistance of coatings. I also will touch base shortly, examples of alternative use of this molecule clearcoat system.
So let’s start with the value proposition for the Silquest A-Link 600 silane. So this is a new product, and it’s a differentiated cell from standard primary aminosilanes, that this aminosilane is a non-yellowing product. So normally, aminosilanes, they demonstrate very strong yellowness, and this is not the case for Silquest A-Link 600. Here, on the slide, we have exposed several test silanes and several test liquids to QUV-B, and actually what you can see is that under QUV-B radiation, silanes, they start to yellow.
Some of them yellow very strong, and some of them less, but still they yellow. If we look at the vial with Silquest A-Link 600, it stays transparent, which is a unique property of this silane. So it means that this silane can be used in the polyurethane applications, especially for finishing applications. You can get benefits of using silanes without the disadvantage of getting a bad colorfastness of your system.
So another interesting feature of Silquest A-Link 600 silane is on the next slide. So normally, when we are talking about primary aminosilanes, formulators cannot introduce them as polyisocyanate activators, simply because primary aminosilanes are extremely reactive towards polyisocyanates. Normally, they react vigorously and with evolution of a lot of heat, and the resulting product is a precipitated gel.
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