Melt straight-pull semitransparent solar backboard base film and production process thereof

The invention relates to the field of polyester production, and particularly discloses a melt straight-pull semitransparent solar backboard base film and a production process thereof. The semitransparent solar backboard base film is prepared from the following raw materials in parts by weight: ethylene glycol A, terephthalic acid, a catalyst and inorganic particles, the molar ratio of the terephthalic acid to the ethylene glycol A is 1: (1.2-1.7), the addition amount of the catalyst accounts for 0.03-0.04 wt% of the total mass of the ethylene glycol A and the terephthalic acid, and the addition amount of the inorganic particles accounts for 0.2-1 wt% of the total mass of the ethylene glycol A and the terephthalic acid; the inorganic particles are pretreated before being added, and the specific process is as follows: firstly mixing the inorganic particles with ethylene glycol B, and then stirring, grinding and centrifuging to obtain an inorganic particle dispersion liquid with the mass fraction of 10-50wt%. Th