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Article:

7 Ways to Avoid Being Friends with Coworkers

What to Do When You're There to Work, Not Make Friends

4. Set Strict Time Limits

When you leave the office, you're done with work.

Don't answer any work-related calls. Don't take work home with you. If you absolutely must do these things, choose an hour or two when you will respond to emails or finish up a bit of work, then set a timer to remind you when this additional work time is over.

Imposing these time limits will train you to keep work where it belongs, and that will help you keep the coworkers where they belong -- at the office, not in your downtime.