* Valuation to reach 133 bln yuan after fundraising closes in Q3. : HONG KONG (Reuters) - JD.com Inc’s finance affiliate said on Thursday it has signed binding agreements with investors to raise 13 billion yuan ($1.96 billion) in fresh equity at a valuation of nearly $20 billion. The fundraising underscores investor enthusiasm for big, privately-held Chinese technology companies even as public valuations falter.