Test for measuring adhesion of polymer binders to a heated metal surface
The following method is used to measure the adhesion of a polymer binder to a heated metal surface: A metal plate is attached to a heated (350° F.; 177° C.) platform and allowed to equilibrate to the temperature of the platform. A polymer emulsion binder is applied to a substrate, such as cotton fabric, and an end of the coated substrate is attached to a tensile measuring apparatus. The coated side of the coated substrate is pressed onto the heated metal plate; e.g., using a 3-lb lab roller. After a length of time to cause drying and/or partial cure of the binder (approximately 30 seconds), the metal plate and the tensile measuring device are separated at a given uniform speed. The amount of force needed to remove the substrate from the metal plate is recorded.
1. A method for measuring adhesion of a polymer emulsion binder to a heated surface which comprises:
securing a metal plate to a heated platform, said heated platform being at a temperature of at least 350° F. (177° C.);
allowing the metal plate to equilibrate to the temperature of the heated platform;
applying a polymer emulsion binder to a substrate, wherein the substrate is used in a creping process, to form a coated substrate having a coated side and an uncoated side;
attaching an end of the coated substrate to a tensile measuring device;
pressing the coated side of the coated substrate onto the heated metal plate;
waiting a period of time to allow drying or partial curing of the binder;
separating the metal plate from the tensile measuring device at a uniform speed, said substrate attached to said tensile measuring device; and
recording the force required to remove the substrate from the metal plate.
2. The method of claim 1 wherein the substrate is a paper or a cotton fabric.
3. The method of claim 1 wherein the force required to remove the substrate from the metal plate is compared to the force required to remove a substrate coated with a control binder, the control binder being useful in a creping process.
4. The method of claim 3 wherein the control binder is a vinyl acetate-ethylene polymer emulsion.
5. The method of claim 3 wherein the force required to remove the coated substrate is 35 to 200% of the substrate coated with the control binder.
6. In a method for predicting the effectiveness of a binder in a creping process, wherein the peel strength of the polymer emulsion binder on a heated metal surface is measured, the improvement which comprises:
securing a metal plate to a heated platform, said heated platform being at a temperature of at least 350° F. (177° C.);
allowing the metal plate to equilibrate to the temperature of the heated platform:
applying a polymer emulsion binder to a substrate, wherein the substrate is used in a creping process, to form a coated substrate having a coated side and an uncoated side;
attaching an end of the coated substrate to a tensile measuring device;
pressing the coated side of the coated substrate onto the heated metal plate;
waiting a period of time to allow drying or partial curing of the binder;
separating the metal plate from the tensile measuring device at a uniform speed, said substrate attached to said tensile measuring device;
recording the force required to remove the substrate from the metal plate; and
comparing the force required to remove the substrate from the metal plate to a force required to remove a substrate coated with a control binder using said method, the control binder being useful in a creping process.
7. The method of claim 6 wherein the substrate is a paper or a cotton fabric.
8. The method of claim 7 wherein the control binder is a vinyl acetate-ethylene polymer emulsion.
9. The method of claim 7 wherein the force required to remove the coated substrate is 35 to 200% of the force required to remove the substrate coated with the control binder.