Viscosity test device and method with inert gas protection

Abstract

The invention relates to a viscosity test device and method with inert gas protection. The device comprises a gas flowmeter, a Ubbelohde viscometer and a glass cylinder, wherein one end of the gas flowmeter is connected to a nitrogen steel bottle filled with high-purity nitrogen inside through a pipeline, and the other end of the gas flowmeter is connected to a gas buffer device through a pipeline; the top end of the gas buffer device is provided with a first valve with a glass gate 90-degree air suction joint, a second valve with a T-shaped glass gate three-way valve and a third valve through a Y-pipe respectively; the first valve, the second valve and the third valve are connected with three ports of the Ubbelohde viscometer fixed in the glass cylinder with an iron frame through a pipeline respectively; and a mechanical stirring device as well as a heating iron ring and a temperature control couple of an electronic thermostat are also arranged in the glass cylinder, and the viscosity and viscosity average molecular weight can be measured with a dilution method and a one-point method. Through the invention, the intrinsic viscosity and viscosity average molecular weight of a high polymer that is easily oxidized or crosslinked when encountering air or water can be quickly and accurately obtained.

Description

technical field [0001] The invention belongs to the technical field of viscosity testing methods and devices, in particular to a viscosity testing device and method with inert gas protection. Background technique [0002] The molecular weight of polymer is one of the most basic structural parameters of polymer materials, which is closely related to its processing and physical and chemical properties. There are many methods to measure the molecular weight of polymers, such as end group determination method, osmotic pressure method, light scattering method, ultracentrifugation method and viscosity method, etc. Due to the simple device and easy operation of the viscosity method, the Ubbelohde viscometer can quickly Obtain the intrinsic viscosity and viscosity average molecular weight of the polymer, so it is the most widely used. With the rapid development of science and technology, the types of polymers are becoming more and more diverse. Many polymers are easily oxidized or ...

AI Technical Summary

Problems solved by technology

With the rapid development of science and technology, the types of polymers are becoming more and more diverse. Many polymers are easily oxidized or cross-linked when exposed to air or water, and cannot be used for conventional viscosity testing.

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