Small solid-phase tack producing device suitable for experimental laboratory and use method thereof

Abstract

The invention provides a mini solid state polycondensation device and a using method thereof applicable to labs. The device is characterized by comprising a tank body, a feeding-discharge port and a heating jacket on the tank body, two mixer shafts and mixing arms thereof, a planetary gear drive system, and a vacuumed opening, a nitrogen inlet, a biphenyl inlet and a biphenyl outlet connected with the tank body and the jacket. Before the operation of equipment, biphenyl enters into the jacket of the equipment and is heated to a certain temperature; then polyester chips enter the equipment through a charging opening and the equipment begins to operate. The device of the invention has compact structure and low construction cost, has an equipment feeding coefficient over 65 percent and is applicable to the technological development of factories or the scientific research of scientific research institutions.

Description

technical field [0001] The invention relates to a solid-phase thickening device, more precisely, a small-sized solid-phase thickening device suitable for laboratory use and a method for using the same, belonging to the technical field of chemical fibers. Background technique [0002] Polyethylene terephthalate, also known as polyester, is an industrial raw material that has developed rapidly in recent years. Polyester with an average molecular weight of about 19,000-22,000 can be used to make private textiles and films. High molecular weight (24000-39000) polyester is used in the manufacture of industrial polyester, polyester reinforced plastics and blown polyester bottles. And solid-state polymerization tackification is an important method to manufacture polyester with high viscosity and low carboxyl content. It is the process of heating polyester chips with an intrinsic viscosity of 0.60-0.70 to 200-240°C under the protection of high vacuum or inert gas to increase the in...

AI Technical Summary

Problems solved by technology

The disadvantages of this device are intermittent operation, small batches, uneven batch quality, low heat transfer coefficient, and only about 50% of the charging coefficient. The vacuum system of the large-scale vacuum drum device requires a very large vacuuming capacity. Thereby it is difficult to apply on large-scale industry; Another kind is the continuous device of vacuum drum type, although industrialized application is also arranged at present, this device still has the low loading factor (generally only 20-30%), and the equipment volume is huge, and cost High, in addition, due to the long back-mixing time of the polymer in the equipment, it will also increase the dispersion of the molecular weight distribution

[0004] The above two polycondensation devices have large device capacity and are not suitable for small prototypes in laboratories.

Images