Sometimes by looking at an existing material, a product and process can be made even better. In the oil and gas industry, Parker LORD found they had an option that could help the fracturing pump process. Fracturing fluid ends utilize a valve body with a molded thermoplastic polyurethane material (TPU) ring to pump fluid downhole. The challenge presented was to develop a valve with increased environmental resistance and service life. The life of the bond is normally limited―this means that maintenance often occurs during pumping, resulting in nonproductive time. A perfect scenario is to have maintenance fall between jobs, as opposed to on the job. A proprietary TPU in conjunction with new Parker LORD adhesive technology was explored.
Collaborating for Solutions
At Parker LORD, we were collaborating with the engineers at one company on injection molding their TPU. It started out with looking at a traditional avenue of considering the Chemlok® 213 urethane adhesive bonding agent. As we partnered with them on their particular elastomer chemistry, we suggested one of our new developments to make a better overall product using the chemistry of the Chemlok® 701/702 two-component urethane system. Parker LORD engineers were able to work together with the customer’s engineers from the ground up―from initial testing and initial molding.
Testing proceeded at both at the Parker LORD facility and on location. Chemlok 701/702 was performing exceptionally well and even outperforming the Chemlok 213 bond strength. It also offered some process improvements and was more streamlined. Additionally, the life expectancy is projected to increase by more than 30 percent, which allows maintenance to be performed more efficiently, mitigating nonproductive downtime and saving time and money.
This collaboration allowed Parker LORDs engineers to guide the customer through this new process. The customer had a certain TPU they were using before and now they now have their own special TPU with the addition of the Chemlok 701/702 adhesive.
Why Chemlok 701/702 for castable urethanes?
Castable urethanes are two-part urethane with great properties – abrasion resistance, oil resistance, tear and cut resistance, as well as high load bearing. But many castable urethane adhesives were not designed to perform at elevated temperatures or wet environments. These conditions can lead to bond line failures, especially in 1K adhesives. Castable adhesives are often used in wheels, rollers, bumpers, mining and oilfield equipment.
Chemlok 701/702 is a two-component urethane system used to bond castable urethane elastomers to metal. It is composed of a mixture of polymers, curatives and pigments dissolved in an organic solvent system.
It provides bond strengths greater than the tear strength of the urethane substrate. Using Chemlok 701/702 bonds castable urethanes for use in extreme environmental conditions, including elevated temperature applications and high moisture conditions. Additional characteristics of Chemlok 701/702 include versatility, no prebake needed, ease of application, convenience, compatible process, and resistance to environment.