Free radical addition of halogens to butane generally doesn't happen at room temperature/pressure, it needs some pretty extreme reaction conditions to proceed to completion. In fact, hydrocarbons like butane, pentane, hexane etc are often used as solvents for reactions simply due to their rather unreactive nature. It's very hard to get them to react with anything at room temperature.
Also, chlorine bleach is not a good source of molecular chlorine. It's sodium hypochlorite solution - NaOCl and not just dissolved Cl2.
I also second everyone elses' advice to not mix chemicals without having some idea of what to expect. You don't want to be making chloroacetone or phosgene; they're chemical weapons and are strong irritants to any mucous membrane.