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Knowledge You Can Build On — Est. 1998

Interesting Glue reaction

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Interesting Glue reaction

#1

Interesting Glue reaction

Barry Irby

I am still wring on my son and DIL's table. They wanted it to have character and Patina. Some of the oak had some old insect damage and I used it. Then I had to laminate another piece to it. I had lift the top sitting in my storage area for about a week. There were a couple of little "streams" of sawdust or frass drooling done. Hmm? Maybe the insect damage was not quite as old as I thought. To be sure the bugs were dead I painted some BoraCare (Borate suspended in glycol) onto the damaged areas and left them to dry over night. Dried the area as thoroughly as I could, even applied a little heat with a heat gun, crapped with a card scraper and sanded the area. Applied a coat of Titebond I and was about to lay on the second piece when I looked closely at the glue. In the area where the BoraCare was it setup or coagulated immediately. Lifted it off as a sheet. This was a small percentage of the area being glued so I went on with the laminating.

Clearly something about the BoraCare caused the glue to setup almost instantly. Interesting. Might have been better to kill the bugs with a dose of lacquer thinner. If that works?

Re: Interesting Glue reaction

#2

Re: Interesting Glue reaction

Dick Coers

Heat is the only sure way to kill eggs and larva. The center of the wood has to reach 135 degrees for several hours. It’s recommended that the wood be heated to 150 degrees to make the center 135. If you saw dust, you may now have some beetles in your shop. Plenty of home remedies out there, but heat is the only commercially approved method to sterilize wood. I also understand that Borocare prevents new eggs from being laid. Not kill eggs or larva deep in the wood.

Re: Interesting Glue reaction

#3

chemistry experiment

Bill Tindall, E.Tn.

You discovered that borates react with polyvinyl alcohol (component of glue) to make silly putty. We do it to dazzle grade schoolers in chem demos.

Re: Interesting Glue reaction

#4

Jesper, Denmark

Re: chemistry experiment

Jesper, Denmark

...... and that glycol is a "greasy" type solvent, which has a high boiling point and is very slow to evaporate.

Re: Interesting Glue reaction

#5

Re: Interesting Glue reaction

Bruce Schoenleber

"... crapped with a card scraper and sanded the area."

That had to hurt.

Re: Interesting Glue reaction

#6

OUCH!

:(

Re: Interesting Glue reaction

#7

Re: chemistry experiment

Bill Tindall, E.Tn.

"and that glycol is a "greasy" type solvent" Are you referring to ethylene glycol? There is none of this chemical in Titebond glue, nor is it related to polyvinyl alcohol.

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