Help identifying a chemical compund

[Ben.Lawrie]

Hi - Looking for some help identifying a chemical compound that I use in one of my manufacturing processes.  

The compound in question is supplied by the OEM of my equipment and is part of an adhesion promotor for printing directly onto glass. It's one of three parts in the end solution that's used. I tried looking at the Safety Data Sheet to see what it is but there isn't any CAS number or description as it lists the substance as non-harmful. I'm trying to source alternative supplies, but not being able to identify this compound is making that difficult.

The three parts in the end solution are

1. Distilled Water (92%)
2. Part A - liquid (2%) - this is the one I can't identify
3. Part B - liquid (6%) - 3-Aminopropyltriethoxysilane CAS 919-30-2

The process for creating the solution involves mixing the distilled water and Part A for 30mins, then adding Part B and mixing for a further 30mins. I'm guessing the part A does something to the water to make the 3-Aminopropyltriethoxysilane soluble or not break down perhaps, but I really don't know.

I'm hoping someone might know based on the 3-Aminopropyltriethoxysilane what function Part A could be doing, and therefore what kind of compound it might be, or alternatively, know of any UK based facilities that could test a sample and let me know.

Any help would be much appreciated!

Thanks

Ben

[John Cuthber]

It may be easier to trawl through the patents than to try to work it out.

[exchemist]

4 hours ago, Ben.Lawrie said:

Hi - Looking for some help identifying a chemical compound that I use in one of my manufacturing processes.  

The compound in question is supplied by the OEM of my equipment and is part of an adhesion promotor for printing directly onto glass. It's one of three parts in the end solution that's used. I tried looking at the Safety Data Sheet to see what it is but there isn't any CAS number or description as it lists the substance as non-harmful. I'm trying to source alternative supplies, but not being able to identify this compound is making that difficult.

The three parts in the end solution are

1. Distilled Water (92%)
2. Part A - liquid (2%) - this is the one I can't identify
3. Part B - liquid (6%) - 3-Aminopropyltriethoxysilane CAS 919-30-2

The process for creating the solution involves mixing the distilled water and Part A for 30mins, then adding Part B and mixing for a further 30mins. I'm guessing the part A does something to the water to make the 3-Aminopropyltriethoxysilane soluble or not break down perhaps, but I really don't know.

I'm hoping someone might know based on the 3-Aminopropyltriethoxysilane what function Part A could be doing, and therefore what kind of compound it might be, or alternatively, know of any UK based facilities that could test a sample and let me know.

Any help would be much appreciated!

Thanks

Ben

I had to look this up, but it seems that what the aminosilane is doing is "silanising" the surface of the glass, viz. coating it with a chemically bonded film of alkoxysilane molecules, to provide a key for whatever is then to be bonded to the glass - most likely by means of the amine group. It doesn't seem obvious (to people outside the industry) what this other ingredient does. One guess (and it can only be a guess) might be something that cleans or prepares the surface of the glass in some way, perhaps by removing any oily deposits. An alcohol perhaps? Aminopropyltriexthoxysilane itself seems to be already water soluble, so it doesn't look as if it is needed for that reason. 

[studiot]

What might throw some light on your question would be for you to tell us about your printing process. (No trade secrets required.

Just is is water bases, oil based or what.

 

Silanes are chemical compounds that penetrate fine cracks in ceramic materials to repel water.

Glass surfaces are not as smooth at the microscopic level as you might think and have microcracks.

We used to use silanes to do something similar in concrete.

[Ben.Lawrie]

Thanks for the replies guys.

A bit more detail about the process if it helps:

This process is about pre-treating glass bottles prior to printing with organic UV cured inks. As I understand it, the aminosilane is indeed forming a chemical layer on the inorganic glass for the organic compounds in the ink to bond with. before being sprayed with the aminosilane solution, the bottles are flamed with gas burners to remove the cold end coating (a kind of protective wax on glass to stop it scratching in transit) and increase the surface energy to help the ink properly 'wet' onto the glass. 

I've included the SDS for the S1 Series of inks we use, along with the sheets for Part A and Part B.

S1-Series_SDS_2019.doc.pdf MagiCoat-Glass-Primer-Part-B.pdf MagiCoat-Glass-Primer-Part-A-rev81024250.pdf

[exchemist]

24 minutes ago, Ben.Lawrie said:

Thanks for the replies guys.

A bit more detail about the process if it helps:

This process is about pre-treating glass bottles prior to printing with organic UV cured inks. As I understand it, the aminosilane is indeed forming a chemical layer on the inorganic glass for the organic compounds in the ink to bond with. before being sprayed with the aminosilane solution, the bottles are flamed with gas burners to remove the cold end coating (a kind of protective wax on glass to stop it scratching in transit) and increase the surface energy to help the ink properly 'wet' onto the glass. 

I've included the SDS for the S1 Series of inks we use, along with the sheets for Part A and Part B.

S1-Series_SDS_2019.doc.pdf 248.2 kB · 1 download MagiCoat-Glass-Primer-Part-B.pdf 275.23 kB · 1 download MagiCoat-Glass-Primer-Part-A-rev81024250.pdf 118.12 kB · 1 download

Hmm, I think you may need someone with experience in the printing industry to advise you. My own experience is the oil industry (lubricants) which isn't very relevant.

Looking at the MSDS for Part A I note that it is a mixture rather than a single substance, that it is not flammable (no flashpoint) and that the lowest boiling point component seems to boil at 100C. So a water-based mixture, most likely. From the generic nature of the information provided, it looks rather as if it may be some kind of proprietary formulation. (Some of our lubricant MSDSs  were drafted in a similarly unhelpful style, to protect proprietary formulation knowledge.)  

Quickly looking up a few things on the internet I came across a comment that reaction times and concentration may need control during silanising, to prevent development of an unwanted thick silane polymer layer. I wondered if this formulation may do something to help control that.  But no more than a possibility.   

I confess this is about as far as I can get with this. Maybe others will be able to add more.