Single-feed-cylinder capillary rheometer

Abstract

The invention discloses a single-feed-cylinder capillary rheometer. A feed cylinder of the capillary rheometer is a single feed cylinder; the front end of the feed cylinder is provided with a plunger, the rear end of the feed cylinder is provided with a traveling nut, an electric heater is arranged around the feed cylinder, a long capillary die, a support part and a zero-length capillary die / short capillary die are arranged in the feed cylinder, and the outer diameter of the long capillary die, the outer diameter of the zero-length capillary die / short capillary die and the outer diameter of the support part all are matched with the inner diameter of the feed cylinder. The single-feed-cylinder capillary rheometer can be used for measuring extensional flow and shear flow parameters of polymer melt simultaneously, can eliminate entry pressure drop well, has the same function as a double-feed-cylinder capillary rheometer, and also has the advantages of saving raw materials, facilitating dismounting, purging easily, reducing artificial influences, realizing higher precision, and the like.

Description

technical field [0001] The invention belongs to the technical field of polymer rheology testing, in particular to a single barrel capillary rheometer. Background technique [0002] A central task of polymer material research is to have a fundamental understanding of the fluidity of polymer materials, and rheometers are instruments for measuring the rheological properties of polymer materials. The rheometer can simulate the actual process and production environment, measure and analyze the rheological properties of the tested polymer materials, and the obtained data can be directly used in the production and processing of polymer materials. [0003] Commonly used rheometers mainly include capillary rheometers, torque rheometers and rotational rheometers. Capillary rheometer is similar to the flow of materials in most processing and molding processes. It can not only measure the viscosity of materials, but also study the extrusion behavior and discuss the elasticity of materi...

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Problems solved by technology

Generally, there is only one capillary die in the barrel of the single-barrel capillary rheometer used in the test. Although the structure is simple, it is necessary to replace the capillary dies with different length-to-diameter ratios many times during the test to perform Bagley calibration. Obtain the rheological properties of polymer materials, because the situation of each feeding cannot be completely reproduced, the final data results are not accurate

The double-barrel capillary rheometer adopts the structure of parallel capillary die. Compared with the single-barrel capillary rheometer, it can not only improve the test efficiency, but also reduce the error caused by the experimental equipment. However, the double-barrel capillary rheometer The structure is more complicated and the cost is higher

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