SU1651176A1 - Device for determining pitch softening temperature - Google Patents

Abstract

The invention relates to the field of studying the properties of carbon materials, in particular, to devices for determining the softening temperature of pitches, and can be used to control the parameters of raw materials, as well as in scientific research. The purpose of the invention is to improve the accuracy of determining and reducing harmful emissions. The device contains a rotating disk with a film deposited on it from the pitch under study, two thermal sensors, current and potential contacts. On the shaft of the disk ring-shaped current collectors are placed which are supported by sliding contacts. The disk covers the refrigerator and the heater. The recording devices are connected to the thermal sensors, current and potential contacts. As the disc rotates, the pitch film deposited on it alternately cools and heats up. At the same time, the devices record the temperature dependence of the electrical resistivity of the pitch film, according to which its softening temperature is judged. 1 s p f-ly, 1 silt

Description

The invention relates to the study of the properties of carbonaceous materials and can be used in the control parameters of raw materials, as well as in scientific research,

The purpose of the invention is to improve the accuracy of determination, reduce labor intensity and improve working conditions.

The drawing shows the device, General view.

The device contains a tank 1 inside which a heater 2 is placed. Connected to a power source 3 and a regulator 4. A disk 5 made of electrically insulating material is placed in the tank into which the main € and an additional 7 thermal sensors (for example, chromel-Kolel thermocouples) are inserted , and also current 8 and potential 9 contacts. The disk 5 is pressed by a nut 10 and fixed on the shaft 11. The disk 5 covers the refrigerator 12 and the heater 13 mounted on the racks 14. The disk 5 has a groove 15. A self-recording voltmeter 16 is connected to the contacts 9, and a power source 17 is connected to the contacts 10. recorder ammeter 18 On the shaft 11 there are annular current collectors 19, separated by insulating rings 20. Sliding contacts 21 are supported on the current collectors. Measuring device 22 (recording recorder) is connected to the sensor 7, amplifier 23 with setting device is connected to the thermal sensor 8

24.On the amplifier output is connected drive

25, the shaft of which is associated with the shaft 11. The device operates as follows.

SP

A hinge 26 of the test pitch is placed in the tank 1 and heated above the assumed softening temperature, after which a voltmeter 16 and an ammeter 18 are turned on. After warming up the instruments, the drive 25 turns on the rotary disk 5. The latter takes a thin film of pitch during rotation, which comes out of the main mass of the sample begins to be cooled by the cooler 12. A voltmeter 16 and an ammeter 18 through the current collectors 19 and the sliding contacts 21 measure the change in the electrical resistivity of the film between Contacts 8 and 9. Then, using a load The heater 13 warms up the film and removes the temperature dependence of the electrical resistivity during heating. Further, at least one cooler and at least one heater may cost to ensure repetition of measurements in the heating-cooling cycle during one revolution of the disk 5.

The cooling or heating of the pitch film on the disk is controlled by an additional thermal sensor 7 (the main thermal sensor 6 is used to measure the temperature level), and its differential signal is fed to the amplifier 23, depending on the output signal from which the rotation speed of the drive 25 changes, automatic control and selection of the necessary to achieve a given measurement accuracy of the rate of heating and cooling.

The obtained temperature dependences of the electrical resistivity during heating and cooling determine the break points, which make it possible to determine the temperature range of the pitch softening point. The softening point in accordance with a certain point can be taken as the break point on the heating curve or the average between the boundaries of the interval.

Claims (2)

1. A device for determining the softening temperature of pitches, containing a reservoir, covering its heater, potential contacts with a voltmeter connected to them, current contacts with connected to them a power source and an ammeter and a thermal sensor, characterized in that, in order to improve the accuracy of determining and reducing harmful emissions, it is additionally equipped driven and placed on its axis with the possibility of rotation by a disk of electrically insulating material, a second thermal sensor, a cooler, a second heater, ring current collectors and sliding contacts, with the second thermal sensor placed on the disk surface covered by the cooler and heater, and annular current collectors on which the sliding contacts rest. 2. The device according to claim 1, characterized in that it is additionally equipped with an amplifier, a third temperature sensor located on the disk, and a dial connected to the input of the amplifier, to the output of which the drive is connected.