What might happen.
You borrow the money. The partners don't steal it but actually fund you getting it to market. They get their money back and you make a little profit.
BUT WITHOUT A PATENT, YOU DO NOT OWN THE IDEA.
Your investors who have more money than you dissolve the partnership, undercut you and take your IP and market it themselves, leaving you high and dry.
OR MORE LIKELY
Your investors just take your money and idea.
Most big banks have a small business support service. Have you spoken to them? Have you things such as Independent Financial Advisors?
It is better to invest a few hundred dollars for good advice than to fall for the smooth talk of a desperate snake oil salesman.
To quote Monty Python: Run away! Run Away!
www.youtube.com/watch?v=KAp9sFVdERQ