Adhesion Strength Of Sticky Pad (Reusable PSA) - Northstar Polymers
Northstar Polymers (Div. of Tandem Products, Inc.) 3444 Dight Avenue South, Minneapolis, MN 55406 USA Tel: (612)721-2911, Email: info@northstarpolymers.com Adhesion Strength of Sticky Pad (Reusable PSA) Polyurethane Gel Formulas GK-7 and GK-22R Northstar Polymers carry 2-part thermoset polyurethane casting resin formulations, which can be used to make Sticky Pads, reusable Pressure Sensitive Adhesive (PSA), and other custom products with sticky surfaces. We carry GK-7 for the stickiness range of common sticky pad products and GK-22R for higher adhesion property. Each respective formula has an adjustment method, which enables its users to adjust the stickiness/adhesion strength of the end products. With GK-7, the user can simply change the mixing ratio between part-A and part-B. With GK-22, partB/part-C components are blended to make modified part-B. The following data is produced from our in-house test method. 1” x 2” sticky pad samples are made. Each sample is sandwiched with two pieces of PET film and pulled to delaminate as the peak pulling force is recorded. (See the picture on the right for reference.) Adhesion Strength Of GK-7 and GK-22R to PET Film GK-22R#5* GK-22R#4 GK-22R#3 GK-22R#2 GK-22R#1 GK-7#3 GK-7#2 GK-7#1 0 1 2 3 4 5 6 7 8 http://www.northstarpolymers.com
Northstar Polymers (Div. of Tandem Products, Inc.) 3444 Dight Avenue South, Minneapolis, MN 55406 USA Tel: (612)721-2911, Email: info@northstarpolymers.com The test results are expressed in the peak “pounds of force” to delaminate one side of PET off. For your reference, the stickiness of GK-7#2 is close to typical cellphone holder products. Cohesion Strength and Tensile Strength of Materials The failure point of delamination is either at the adhesion between the PET film and the sticky pad or the cohesion failure of the sticky pad. The above test sample did not have cohesion failure except for GK22R#5*. When the sticky pad has a higher stickiness, the overall strength including the cohesion strength weakens. This makes the sticky pad product easier to tear and leave the residue on the substrate. The chart below shows the tensile strength of the samples based on our in-house test method. The data is expressed in the pound of force in pounds per square inch (psi) based on the cross-section area of each sample when it is stretched by 10 times of the original length. All of these samples have ultimate elongation values higher than 1000% with our in-house test. Tensile Streight of GK22R and GK7 90 80 70 60 50 40 30 20 10 0 GK-7#1 GK-7#2 GK-7#3 GK-22R#1 GK-22R#2 GK-22R#3 GK-22R#4 GK-22R#5 The adhesion strength of sticky pad changes depending on the surface energy or substrate. The adhesion strength is much stronger when the sticky pad is applied to substrates with high surface energy such as glass, polycarbonate, and epoxy. The adhesion strength is weaker when it is applied to a substrate with low surface energy such as polypropylene, silicone, and PTFE. Please referent to this chart for typical surface energy levels of common polymers. Choosing the Right Material Configuration for Your Application http://www.northstarpolymers.com
Northstar Polymers (Div. of Tandem Products, Inc.) 3444 Dight Avenue South, Minneapolis, MN 55406 USA Tel: (612)721-2911, Email: info@northstarpolymers.com In the sticky pad (or reusable PSA) applications, the product not only have to provide the appropriate adhesive property but it also must come off from the substrate without a cohesive failure, which leaves a sticky residue on the substrate. Also the removing the product from cannot damage the substrate such as a painted wall. The adhesive strength needs to be controlled so that it is not too strong. Set Adhesion Strength Range Adhesion cannot be too weak to serve the product purpose. Adhesion cannot be too strong that can damage the substrate that it sticks to. Weak cohesion strength at high adhesion strength leads to residue on substrate. Must select the target substrate range based on surface energy There is no such a material that yields the same adhesion strength to various substrates with a wide range of surface energy level. Product must be designed for limited types of substrates. When the raw material for thermoset polyurethane-based “sticky pad” or PSA products are evaluated, it is important to determine the range of stickiness on substrates within a certain surface energy range. There is no such a material that yields exactly the same adhesion strength to various substrates with a wide range of surface energy. http://www.northstarpolymers.com
Northstar Polymers (Div. of Tandem Products, Inc.) 3444 Dight Avenue South, Minneapolis, MN 55406 USA Tel: (612)721-2911, Email: info@northstarpolymers.com Test Sample Descriptions GK-7 is formulated in such a way the user can change the stickiness of the material by simply changing the mixing ratio between the given part-A and part-B components. The samples are made at the following ratios. The ratios are by weight. GK-7#1 ---- 1: 8.771 part-A: part-B GK-7#2 ---- 1: 9.254 part-A: part-B GK-7#3 ---- 1: 9.717 part-A: part-B GK-22R is formulated in such a way the user pre-mix part-B and part-C components at the desired ratio to yield the desired stickiness. Part-A and the blended part-B/C are mixed at the designated constant mixing ratio to make a casting batch. The ratios are by weight. GK-22R#1 ---- 100: 0 part-B : part-C GK-22R#2 ---- 75: 25 part-B : part-C GK-22R#3 ---- 50: 50 part-B : part-C GK-22R#4 ---- 25: 75 part-B : part-C GK-22R#5 ---- 0: 100 part-B : part-C Formula information GK-7 https://northstarpolymers.com/051719 PDF Files/GEL/042420 TDS GK-7 Standard.pdf GK-22R https://northstarpolymers.com/051719 PDF Files/GEL/042320 TDS GK-22R.pdf Other Useful references Typical Surface Energy of Various Polymers https://northstarpolymers.com/051719 PDF Files/GEL/Surface Energy Of Polymers.jpg Application for Polyurethane Gel Elastomer in General https://northstarpolymers.com/051719 PDF Files/GEL/111919 Applications for Polyurethane Gel Elasto mers.pdf http://www.northstarpolymers.com
Northstar Polymers (Div. of Tandem Products, Inc.) 3444 Dight Avenue South, Minneapolis, MN 55406 USA Tel: (612)721-2911, Email: info@northstarpolymers.com Contact Information For any questions, please contact Northstar Polymers. Tel: Fax: Web Site: E-Mail: 612-721-2911 (Ext. 119) 612-721-1009 http://www.northstarpolymers.com info@northstarpolymers.com Notice: All of the statements, recommendations, suggestions, and data concerning the subject material are based on our laboratory results, and although we believe the same to be reliable, we expressly do not represent, warrant, or guarantee the accuracy, completeness, or reliability of same, or the material or the results to be obtained from the use thereof, neither do we warrant that any such use, either alone or in combination with other materials, shall be free of the rightful claim of any third party by way of INFRINGEMENT or the like, and NORTHSTAR POLYMERS DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, OF MERCHANTABILITY and FITNESS FOR A PARTICULAR PURPOSE. Revised: 4/28/2020 http://www.northstarpolymers.com
Northstar Polymers (Div. of Tandem Products, Inc.) 3444 Dight Avenue South, Minneapolis, MN 55406 USA Tel: (612)721-2911, Email: info@northstarpolymers.com Adhesion Strength of Sticky Pad (Reusable PSA) Polyurethane Gel Formulas GK-7 and GK-22R Northstar Polymers carry 2-part thermoset polyurethane casting resin formulations, which can
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