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Measuring Bonding Strength of Binders and Adhesives

IP.com Disclosure Number: IPCOM000095270D
Original Publication Date: 1965-Nov-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Bates, G: AUTHOR [+2]

Abstract

A direct method for testing bonding strength of binders and adhesives is to 1. Introduce a fixed quantity of magnetic particles into a fixed quantity of binder or adhesive, 2. Form the binder or adhesive containing magnetic particles into a web of fixed dimensions and cause the web to set or cure, 3. Place the web in a torque apparatus while applying a magnetic field on the order of 5,000 oe. and record a torque curve, 4. Apply a fixed quantity of solvent to the surface of the web, after the torque curve has been determined, and while maintaining the web in a fixed position in the magnetic field, and 5. Record a second torque curve after the solvent has been totally absorbed or evaporated, and while still maintaining the magnetic field.

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Measuring Bonding Strength of Binders and Adhesives

A direct method for testing bonding strength of binders and adhesives is to
1. Introduce a fixed quantity of magnetic particles into a fixed

quantity of binder or adhesive,
2. Form the binder or adhesive containing magnetic particles

into a web of fixed dimensions and cause the web to set or

cure,
3. Place the web in a torque apparatus while applying a magnetic

field on the order of 5,000 oe. and record a torque curve,
4. Apply a fixed quantity of solvent to the surface of the web,

after the torque curve has been determined, and while

maintaining the web in a fixed position in the magnetic field,

and
5. Record a second torque curve after the solvent has been

totally absorbed or evaporated, and while still maintaining

the magnetic field.

There is a marked displacement between the first and second torque curves which is indicative of binding strength. The less the displacement, the greater the binding strength. This is a direct method for testing bonding strength and also affords a direct comparison of different binders and adhesives under similar conditions. The application of solvent to the web weakens the bonding strength of the binder or adhesive and allows the magnetic particles to be physically rotated by the strong external magnetic field. The second torque reading is roughly indicative of the number of magnetic particles which are capable of rotating. Thus, it is indicative of the bonding strength between...