An ultrasonic plasticizing capillary rheometer and viscosity testing method

Abstract

An ultrasonic plasticizing capillary rheometer comprises a frame, a rheological test unit, an ultrasonic vibration apparatus, and a tool head moving and loading unit. The ultrasonic vibration apparatus is provided with an ultrasonic tool head capable of extending into a plasticizing chamber along an axial direction, providing extrusion force for polymer in the plasticizing chamber, and providing ultrasonic wave energy required by the polymer for fusion from a solid state to a liquid state. In the ultrasonic plasticizing capillary rheometer, three steps including heating fusion, ultrasonic vibration for fluidity increase, and material extrusion are completed through the ultrasonic tool head and in the plasticizing chamber, thereby simplifying the conveying path. A heating ring providing the required initial temperature for the plasticizing process sleeves a material canister, provides a constant material canister temperature for the rheometer, and reduces the test error. A filter screen is arranged in the material canister, centralizes fused polymer, and improves the test accuracy. During a test process, a viscosity test method is accurate in heating, short in fusion time, and wide in application range, is slightly affected by the external environment, and can provide viscosity data high in accuracy.

Description

technical field [0001] The invention relates to a technology for detecting rheological properties of polymer materials, in particular to an ultrasonic plasticizing capillary rheometer and a viscosity testing method. Background technique [0002] In recent years, with the vigorous development of micro-nano manufacturing technology, micro-injection molding technology based on polymer materials has been widely used in high-tech fields such as optoelectronic communication, image transmission, biochemical medicine, information storage, and precision machinery. Because the existing micro-injection molding machines mostly use screw or plunger plasticization methods, there is a problem that the amount of plasticization at one time is too large, and the injection amount seriously does not match the volume of the micro-parts, resulting in poor stability of molding quality and serious waste of materials. However, due to the different plasticizing methods, there are certain differences ...

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Problems solved by technology

[0004] Because the above-mentioned patents only introduce ultrasonic waves into the heated and melted extruded polymers, the ultrasonic waves are mainly used to provide ultrasonic energy to the heated and melted polymers to enhance the fluidity of the melted polymers, but in the early stage Ultrasonic vibration is not added in the heating and melting process, so the improvement of polymer fluidity is limited, and different rheometers have different conditions such as the path that the melted polymer passes from the heating unit to the capillary die. Therefore, the test results of different rheometers will be different; and for the same rheometer, there may also be differences between test results in different periods due to changes in external conditions (such as ambient temperature) ; So far, there is no unified and widely recognized test standard at home and abroad

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