Slack has some pretty fine grained notification controls. You can set it up so only certain channels notify, or so that only direct mentions notify, or so that

Slack has some pretty fine grained notification controls. You can set it up so only certain channels notify, or so that only direct mentions notify, or so that only dms notify. You can also just turn off notifications altogether. Explain to your colleagues that slack is keeping you from getting work done so you are going to turn off notifications. If you feel guilty give them a way to contact you if they truly need you immediately.