Diaper changing trouble

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Lately, my son has been really difficult at diaper changes. He kicks, screams, tries to get away, fights. Every diaper change is a battle. I have tried everything- distraction, singing to him, letting him have a toy to play with- nothing works. I thought maybe he was upset because I was interrupting his play, so I tried giving him warning, like when making transitions, and letting him take the toy or book he is using with him for the diaper change. Nothing helped. I thought maybe he was ready to potty train. He shows some interest, talks about it, tells me when he needs a change, but refuses to sit on the potty. I'm ok with that, he's young yet- only 21 months. I've tried changing him standing up in the bathroom when he is just wet, that didn't help. He does not have a rash or any visible irritation in his diaper area. I've tried scolding him and taking away his toy that he is holding- and he doesn't even notice. I was hoping this was a phase that would go away quickly, but it's been a few weeks, and if anything it has gotten worse. What else can I do? I'm out of ideas.