▎ 摘　　要

NOVELTY - Packaging substrate with good thermal expansion properties comprises 20-30 pts. wt. deionized water, 7-10 pts. wt. graphene nanosheets, 10-12 pts. wt. ethanol, and 10-12 pts. wt. fluorinating agents, 7-9 pts. wt. acrylic emulsion, 10-12 pts. wt. aluminum foil, 20-22 pts. wt. silicate, 15-18 pts. wt. polyester fiber layer, 7-9 pts. wt. iron oxide, 8-10 pts. wt. zirconium dioxide, 11-15 pts. wt. ceramic powder, 12-15 pts. wt. lithium feldspar, 10-12 pts. wt. zinc oxide, 15-18 pts. wt. lithium carbonate, 20-22 pts. wt. zinc carbonate, 10-12 pts. wt. sodium oxide and 12-15 pts. wt. talc. USE - Packaging substrate with good thermal expansion properties. ADVANTAGE - The packaging substrate with good thermal expansion properties improves the anti-expansion performance, and reduces or eliminates packaging material in the using process producing wrinkles or plate. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) a packaging material with good thermal expansion property, which comprises a packaging substrate and a packaging film, which is bonded by an adhesive, where the inner unit of the package substrate is connected with the semiconductor chip; and (2) a method for preparing package substrate, which involves adding fluorinating agent, aluminum foil, silicate, polyester fiber layer, iron oxide, zirconia, ceramic powder, lithium feldspar and zinc oxide into the high-speed stirrer, stir and mixing uniformly, stirring for 1-2 hours, heating batch to 300-350 degrees C with temperature rising rate of 3-10 degrees C/minute and calcining for 1-3 hours, decomposing decomposable raw materials to obtain calcined batch, heating up to 500-600 degrees C at a heating rate of 5-20 degrees C/minute, adding lithium carbonate, zinc carbonate, sodium oxide and talc to the batch, and adding appropriate amount of deionized water and ethanol, and continue stirring mixture for 1-2 hours; casting mixture obtained into a mold with a preheated temperature of 400-480 degrees C to obtain molded article, keeping molded article at 400-480 degrees C for 1-2 hours, cooling at rate of 0.5-1 degrees C/minute to obtain packaging substrate; putting graphene nano flakes into a high-speed disperser, and adding appropriate amount of deionized water into the high-speed disperser at 120-140 degrees C for 30-50 minutes to oabtin uniform dispersion, where concentration of graphene oxide dispersion is 2-20 mg/ml, raising temperature of the high-speed disperser to 150-170 degrees C, adding acrylic emulsion to the dispersion to obtain graphene oxide composite latex, after cooling the obtained graphene oxide composite latex to 60-80 degrees C, putting into a dryer for drying to form encapsulating film, and coating layer on the surface of the encapsulating film, and adhering adhesive is adhered to the surface of the packaging substrate to obtain a packaging structure.