Improving adhesion of LLDPE to steel during rotational lining of pipes
Improving adhesion of LLDPE to steel during rotational lining of pipes
(OP)
We are currently using an imported LLDPE powder (ICORENE 1869) for the rotational lining of pipes that seems to perform well. Unfortunately the lead time to obtain is very long. We are refurbishing pipes where we burn off the old coating in a cleaning oven, make welding repairs if required, grit blast to white metal and then line the interior of the pipe including flanges with LLDPE to about 4-6mm in thickness. The pipes are used in seawater applications for ships like cooling systems and ballast systems. Temp range about 2 to 40 degrees celsius for the seawater. Most pipes are DN250 to DN600 in diameter. We turn the pipes in two axis and put in a 3.5 meter coating oven to melt the PE powder to the pipe.
We are importing and using the ICORENE 1869 because it is sold as a rotolining grade of LLDPE with the characteristics of superior adhesion to steel and it is a proven product. Is anyone aware of any other LLDPE rotolining grades of LLDPE that are available in China?
Is anyone able to explain how LLDPE is modified to improve the adhesion to steel?
We are importing and using the ICORENE 1869 because it is sold as a rotolining grade of LLDPE with the characteristics of superior adhesion to steel and it is a proven product. Is anyone aware of any other LLDPE rotolining grades of LLDPE that are available in China?
Is anyone able to explain how LLDPE is modified to improve the adhesion to steel?






RE: Improving adhesion of LLDPE to steel during rotational lining of pipes
One method for improving the adhesion is to add reactive functional groups to the polymer chain, as described in this document:
http://www.lyondellbasell.com/techlit/techlit/Broc...
RE: Improving adhesion of LLDPE to steel during rotational lining of pipes
RE: Improving adhesion of LLDPE to steel during rotational lining of pipes
The way to solve that is to add some reactive chemical groups in the PE chain. This forms a so-called coupling agent. An example would be maleated PE or PE with acrylic acid groups added to it. These reactive groups can dock on the metal and attach the PE more strongly. Several companies make such modified PE products. One well-known brand is Epolene. This chap seems to be a good person to ask: http://www.westlake.com/fw/main/epolene----ask-dr-...
One adds some of that product to the normal PE resin to improve adhesion.
Chris DeArmitt PhD
President - Phantom Plastics LLC
Trusted adviser to leading companies around the world
www.phantomplastics.com
RE: Improving adhesion of LLDPE to steel during rotational lining of pipes
RE: Improving adhesion of LLDPE to steel during rotational lining of pipes
Everything you get in China is top secret!
RE: Improving adhesion of LLDPE to steel during rotational lining of pipes
Chris DeArmitt PhD
President - Phantom Plastics LLC
Trusted adviser to leading companies around the world
www.phantomplastics.com
RE: Improving adhesion of LLDPE to steel during rotational lining of pipes
Chris DeArmitt PhD
President - Phantom Plastics LLC
Trusted adviser to leading companies around the world
www.phantomplastics.com
RE: Improving adhesion of LLDPE to steel during rotational lining of pipes
RE: Improving adhesion of LLDPE to steel during rotational lining of pipes
Chris DeArmitt PhD
President - Phantom Plastics LLC
Trusted adviser to leading companies around the world
www.phantomplastics.com
RE: Improving adhesion of LLDPE to steel during rotational lining of pipes
http://www.plasticstoday.com/articles/one-step-pro...
and here
http://iwcs.omnibooksonline.com/data/papers/2011/5...
If you were to add 1-3% of that silane derivatized PE to your normal PE, the silane should bond to the metal and improve your adhesion. It works the same way as the maleic anhydride but uses different chemistry to make the bond.
Chris DeArmitt PhD
President - Phantom Plastics LLC
Trusted adviser to leading companies around the world
www.phantomplastics.com