Title: Fast-Curing Structural Polyurethane Adhesive Increases Manufacturing Throughput

Authors: Stephen Webb, Sr.

DOI: 10.33599/nasampe/c.19.0692

Abstract: Despite the benefits of using polyurethane adhesives compared to acrylics and methyl methacrylate adhesives (MMA) when bonding composites, plastics and painted metal, urethane adoption has been slowed by one critical disadvantage: MMAs’ rate of cure allows for fast production rates. Most urethanes have a linear relationship of open time to cure time, so adhesives that offer reduced handling time also present a very short open time, leaving inadequate time for product assembly. Conversely, adequate open times are associated with slow cure times. Adding heat to cure urethanes has been a common solution, but this adds the cost of heated tooling to the manufacturing costs and creates potential quality issues with “cold spots” in heated tooling. Polyurethanes requiring heat to fully cure can experience incomplete cure.

LORD 7800 fast-curing structural polyurethane adhesive addresses this situation. The 7800 family has a range of open times followed by a rapid cure. It cures at room temperature and offers a solution to cold spots.

References: 1. ASTM D1002-10, 2019, “Standard Test Method for Apparent Shear Strength of Single-Lap-Joint Adhesively Bonded Metal Specimens by Tension Loading (Metal-to-Metal)” ASTM International, West Conshohocken, PA, 2019, DOI: 10.1520/D1002-10R19, www.astm.org. 2. ASTM Standard D3163-01, 2014, "Standard Test Method for Determining Strength of Adhesively Bonded Rigid Plastic Lap-Shear Joints in Shear by Tension Loading" ASTM International, West Conshohocken, PA, 2014, DOI: 10.1520/D3163-01R14, www.astm.org. 3. ASTM D3165-07, 2014, "Standard Test Method for Strength Properties of Adhesives in Shear by Tension Loading of Single-Lap-Joint Laminated Assemblies" ASTM International, West Conshohocken, PA, 2014, DOI: 10.1520/D3165-07R14, www.astm.org, 4. LORD Laboratory Service Report LSR 1801061. 5. LORD Laboratory Service Report LSR 1801922. 6. LORD Laboratory Service Report LSR 1802256. 7. LORD Laboratory Service Report LSR 1901141. 8. Pizzi, A., Mittal, K., Ed. Handbook of Adhesive Technology, 3rd ed. Boca Raton, FL: CRC Press, 2017. 9. Silva, B.B.R. Desenvolvimento De Adesivos De Poliuretano a Base De Óleo De Mamona, 2006. Master thesis in Mining Engineering, Metallurgy and Materials - Federal University of Rio Grande do Sul, Porto Alegre. 10. Szycher, M., Ed. Handbook of Polyurethanes, 2nd ed. Boca Raton, FL: CRC Press, 2013. 11. Villar, W.D., Ed. Química e Tecnologia de Poliuretanos, 3ª ed. Rio de Janeiro, Brazil: Vilar Consultoria, 2004. 12. Zietlow, M, Durso, S., Urethane Adhesives and Applications Corporate Learning Session, 1999.

Conference: CAMX 2019

Publication Date: 2019/09/23

SKU: TP19-0692

Pages: 14

Price: $28.00