Preparation process of gamma-aminopropyl triethoxysilane

The invention relates to a preparation process of gamma-aminopropyl triethoxysilane, and belongs to the technical field of fine chemical engineering. The preparation process comprises the following steps of: reacting gamma-chloropropyl triethoxysilane and liquid ammonia at the weight ratio of 1:3, the temperature controlled at 90 DEG C and the pressure controlled at 4 MPa for 8 hours in an ammoniation kettle; filtering and separating, and then aging and stirring a crude product for 2-6 hours; adding a catalyst, keeping aging temperature at 120 DEG C, and reacting to obtain a gamma-aminopropyl triethoxysilane product with low total chlorine (less than or equal to 5ppm) and content more than or equal to 99.5%. The preparation process disclosed by the invention is simple and low in production cost and meets the requirements for enhancing the mechanical strength, electrical property and anti-aging property of a composite material on application in industries, namely glass steel, plastics, adhesives, casting, textile printing and dyeing and the like, at present.