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Tuesday, 17 September 2019
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Raw materials & technologies, Production and testing

Studying the adhesion of isocyanate coatings to metal substrates

Thursday, 4 September 2014

The adhesive properties of wear-resistant polymethylene polyphenyl isocyanate (PMPPI) coatings to substrates of ferrous and non-ferrous metals were investigated.

The adhesion of isocyanatcompounds on different substrates was tested

Source: ILF

The adhesion of isocyanatcompounds on different substrates was tested

Source: ILF

The Ukrainian researchers used Cu, Ti, Al, brass, cast iron, carbon steel and Cr-alloyed steel as stainless steel materials which are the most common in mechanical engineering.

Copper achieved the highest strength

The results of measurements of adhesive characteristics taken with the help of such methods as a cross cutting test, a quantitative peel test, a lap shear strength test, a contact angle test and a spreading radius test are discussed in terms of the three most common mechanisms of adhesion: mechanical coupling, molecular bonding, and thermodynamic adhesion. It was established that the adhesive properties of PMPPI coatings depend on the content of a ferrite component in the structure of carbon steel substrates. The highest strength of adhesive joint is achieved with a copper substrate.

The study is published in: Progress in Organic Coatings, Volume 77, Issue 11, November 2014, pages 1597-1602.

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