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Monday, 14 October 2019

I am facing a problem of Poor Adhesion

2 Posts

Thursday 19 March 1998 1:00:00 am

On highly plasticized PVC artificial leather, printing by vinyl screen inks create a
problem of poor adhesion. Kindly advise some additives to improve adhesion on this
substrate.

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Monday 20 April 1998 1:00:00 am

Flexible PVC, which is used as leathercloth, contains a large proportion of plasticisers which tend to migrate and exude from the material, so giving rise to adhesion problems when coatings or printing inks are applied.

 

As always, pretreatment of such a surface before application of a coating is of great significance: in the case of PVC, cleaning with an aqueous alkaline cleaner is advisable.

 

In general, plasticiser migration may be suppressed in PVC by applying flexible, single-layer coatings or primers. The binders for these coatings may be based on PUR, PVC or CAB, but their flexibility should be tailored to the topcoat.

 

Another approach is to use adhesion promoters as additives in the coating formulation. It is difficult to make an unequivocal recommendation, but organosilane compounds, especially silanes having amine functional groups, such as aminotriethoxysilane, are probably well suited to this task, although other aminosilanes may also be considered.

prasad naidu

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Friday 04 October 2019 6:43:39 pm

I have PVA formula you want just contact me

my email:- prasadnaidu589@gmail.com

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