Bottle-grade polyester chip based on medicine bottle and preparation method thereof

Abstract

The invention provides a bottle-grade polyester chip based on a medicine bottle and a preparation method thereof, and relates to the field of polyester chip preparation. The bottle-grade polyester chip comprises terephthalic acid, isophthalic acid, a catalyst, ethylene glycol, diethylene glycol and phosphoric acid. The preparation method comprises mixing terephthalic acid, isophthalic acid, a catalyst, ethylene glycol, diethylene glycol and phosphoric acid to obtain a mixture, adding the mixture into an esterification reactor for an esterification reaction so that 90% or more of esterificationefficiency is achieved, carrying out a pre-polymerization reaction and final polymerization reaction process, carrying out a polymerization reaction process under the conditions of a certain temperature, pressure and time, discharging the materials after the required viscosity is reached, and cutting the polyester into slices in specified shapes through a slicing system. The slice raw materials can be in different proportions, so that production of various bottle-grade polyester chips such as medicine bottles and products can be conducted, diversification of the products is achieved, the variety of the products is widened, the process is simple, the production cost is reduced, and the high quality of the chips is guaranteed.

Description

technical field [0001] The invention relates to the technical field of polyester chip preparation, in particular to a bottle-grade polyester chip for pharmaceutical bottles and a preparation method thereof. Background technique [0002] Polyester chips usually refer to the polyester raw materials obtained by polymerization, which are generally processed into flake particles of about 4*5*2 mm. The process routes of polyester production include direct esterification method (PTA method) and transesterification method (DMT method). The PTA method has the advantages of low raw material consumption and short reaction time, and has become the main process and preferred technical route of polyester since the 1980s. The large-scale production line is a continuous production process, while the semi-continuous and batch production process is suitable for various small and medium-sized production devices. The use of polyester now includes fibers, various containers, packaging material...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a bottle-grade polyester chip for pharmaceutical bottles and a preparation method thereof, which can reduce manufacturing costs, and solve the problem that the production process of the existing bottle-grade polyester chip is relatively more difficult due to the improvement of requirements. Complicated, thus causing problems with high manufacturing costs