SU913159A1 - Instrument for determination of liquid material spreading - Google Patents

Description

The invention relates to the physicochemical analysis of substances and can be used when conducting research on the physicochemical properties of liquid materials, especially oils.

A known device for determining the spreading of oils, consisting of a drip device for supplying oil to a sample and a reading device of an industrial microscope MNI for measuring the wetting angle [],

However, the device has a relatively complex construction and is not applicable for oils having small, about 3-7 °, contact angles, since in this case the measurement error is unacceptably large due to the fact that the droplet takes the form of a pool, the geometric parameters of which become uncertain.

2

The closest technical solution to the invention is a device for determining the spreading of liquid materials, consisting of a drip device for feeding material to

⁵ plate set at an angle to the horizon and containing a longitudinal groove £ 2].

However, in the known device there is no reading device for measuring spreading, as a result of which a visual assessment of the measurement results is used. This leads to large measurement errors, especially when monitoring the spreading of clear oils, since the measurement result depends on the individual characteristics of the operator, t, e. from the visual acuity and reaction of the experimenter.

The aim of the invention is to improve the accuracy of measurements.

This goal is achieved by the fact that in the device for determining the spreading of liquid materials, mainly

four

3

oils containing a drip device for supplying oil and a nlastina with a longitudinal groove installed under the drip device at an angle to the horizon, a hole is made in the plate groove, the ratio of which diameter to the droplet diameter is not more than 0.3 · In addition, the device is additionally equipped with a photoelectric converter, a lighting system and a time recorder, with a photoelectric converter installed opposite the opening on one side of a Lastine, and the time recorder is connected to the drip device and photoelectric converter, with the center of the hole coincides with the axis of the canadian.

FIG. 1 shows the device, a general view; in fig. 2 - diagram of the device.

The device consists of a drip device located in the housing 1 and made in the form of a cylindrical container 2, at the bottom of which there is a metal capillary 3 emitting a drop of the test material 4, and at the top - a piston 5 interacting with the carrier 6, screw 7, gear 8, 9 overrunning a coupling 10 with a lever 11; An inclined plane 12 with longitudinal grooves 13 having an opening 14 is installed under the lever. An illuminator consisting of a bulb 15, a lens 16, and on the other photoelectrically is installed opposite the opening on one side of the inclined plane. Converter 17, which is connected to a time recorder 18, which consists of a photo relay 19, an electric stopwatch 20 connected via a self-blocking relay 21 to a microswitch 22. The drip device is fixed on a stand 23, and the entire device is mounted on a fixed base 24.

The device works as follows.

The cylindrical container 2 is filled with the test material. Then by turning the lever 11 until it stops (not specified), the piston 5 is displaced downward, which, when it moves, squeezes the longitudinal groove 13 into the drop and simultaneously switches on the microswitch 22, which, through the self-blocking relay 21, starts the electric stopwatch 20.

913159

a drop of material overlaps the opening 14 in the groove 13. At the moment of its overlap, the photocurrent in the photoelectric converter 17 decreases sharply, the photorelay 19 operates, which switches off the electric stopwatch 20. In the case of opaque liquid materials, the photocurrent decreases, mainly due to the absorption of ) the light energy of the incident flux, and in the case of transparent ones, mainly due to reflection and scattering of the light beam by the edge of the drop, which in this 15 case performs the function of a lens. After there is a uniform spreading of the transparent drop over the hole, the current obtained in the photoelectric converter 17,

20 becomes almost equal to the initial photocurrent (until a drop flows into the hole). The ratio of the diameter 14 to the diameter of the drop 4 should be no more than 0.3. An increase in this 25 ratio leads to an unstable determination of the moment of overlapping the aperture with transparent oil due to the disappearance of the lens effect, as a result of which the light beam hits the photoelectric converter insufficiently diffused. This will lead to the fact that the photo-relay 19 does not work and will not turn off the electric stopwatch 20.

_{35 The} technical and economic effect of the invention is to increase the accuracy of the obtained results of determining the spreading of liquid materials, which is achieved by

₄₀ in the groove of the hole plate and introducing a lighting system and a time recording unit into the photoelectric converter device. Tests of this device showed

₄₅ that the reliability of determining the results obtained when working with transparent oils increased compared with the known device by 30%.

Claims (1)

Claim A device for determining the spreading of liquid materials, mainly oils, containing a drip device for supplying oil and a plate with a narrow groove installed under the drip device at an angle to the horizon, which distinguishes 5 913159 6 In order to improve the accuracy of measurements, a hole is made in the plate groove, the ratio of which diameter to the diameter of the drop is not more than 0.3. the device is additionally equipped with a photoelectric converter, an illumination system and a time recording unit, the photoelectric converter is installed opposite the hole on one side of the plate, the lighting system is installed opposite the hole on the other side of the plate, and the time recording unit is connected to the drip device and the photoelectric converter ^- , while the center of the hole coincides with the axis 5 grooves.