Brittle coating based on resorcinol-formaldehyde resin
SUBSTANCE: coating composition contains resorcinol-formaldehyde resin SF-282 with addition of a carbamidoformaldehyde concentrate KFK-85, and a liquid hardener of carbamide-formaldehyde concentrate - aqueous formalin solution, ethylene glycol and starch OZ-102, where components are taken in the following ratio per 100 pts. wt of the resorcinol-formaldehyde, in %: carbamide-formaldehyde concentrate KFK-85 35-50; hardener 22-25.
EFFECT: coating has short hardening time, high resistance to hydrocarbon media.
1 tbl, 4 ex
The invention relates to the determination of the stress-strain state of metal structures of high-risk facilities in oil, gas and chemical industry, transportation and processing of oil and gas using testcustomer brittle coating that allows you to get a clear picture of the greatest stress concentration, to obtain data to assess the strength of potentially dangerous objects.
To obtain high-quality testcustomer coating material should have good adhesion to construction materials, to be specified tensile strength in the range of operating temperatures, adequate moisture and resistance to chemical environments.
Previously created coatings based on natural resins - brittle rosin coating varnish and powder coating.
The main disadvantage of rosin coating is a high sensitivity to temperature, humidity environment and tests may be conducted in air or vacuum that does not contain a pair of oils or moisture. Rosin varnish coatings require longer drying (not less than 48 hours) at temperatures below 20°C and relative humidity of 40-60%. To accelerate the drying process can use incandescent lamps with a capacity of 500-1000 watts.
Rosin coating hot applied devoid of shortcomings, but require particularly the x cost related flame application [U.S. Pat. Of the Russian Federation No. 2058016, publ. BI No. 10, 1996].
The oxide coating is less sensitive to climatic conditions and test environments, but require specific measures for electrical safety, because it uses oxidized foil. [Prigorovsky NI, Saburina N.A., Bushobama L.V. Brittle lacquer coating for investigation of stresses in machine parts and structures. - M: ITAI an SSSR, 1956. - 36 S.]
Fragile glass coating is also less sensitive to climatic conditions and test environments, but there are certain difficulties in the coating - melt stekloemali in the furnace [lords VK Testcustomer brittle coatings for field investigations of deformation. Dis. Kida. technology. Sciences. M., 1977].
Known polymer-based coating composition of epoxy resin and phthalic anhydride, in a molar ratio of (1-1,05):(2-2,08) [A.S. USSR №1669991, publ. 1991]. The mixture of resin with anhydride is applied to the surface of the product at 110-140°C after heat treatment within 3-5 hours test. May impact on the coverage of high humidity, corrosive environments and temperatures up to 60-80°C.
Testcountbytesinfile coating containing epoxy resin, phthalic anhydride, and dibutyl phthalate in a ratio of 1:0,4:0, is applied by spraying, is cured at a temperature of 130-150°C. Dopuske the camping exposure to high humidity and corrosive environments.
However, the use of such facilities fragile testcustomer coatings is limited by the need to have coverage with the appropriate properties. Known and used so far coatings do not have sufficient stability of the magnitude of the stress sensitivity under varying test conditions.
The use of fragile testcustomer coatings allows to identify the most stressed zones in parts and determination of deformation values to test her strength.
The criterion for the strength of the material brittle coating is the maximum tensile stress, i.e. the crack in a brittle coating occurs when the maximum tensile stress in the coating reaches a certain critical value, independent of the type of the stress state.
The varnishes obtained on the basis of artificial resins when dry, give a very hard, but brittle film, well opposed to sea water, acids, weak alkalis, solutions of many salts and hydrocarbon mixtures. Development of new formulations based on synthetic resins, in contrast to the natural, for the analysis of deformations and stresses in the elements of petrochemical units allow you to get a clear picture of the stress distribution on the surface of a large size, set the zone of maximum is concentratie stress to obtain data to assess the strength of the oil and gas resource devices in harsh environments.
Known fragile coating on the basis of artificial resins containing resorcinolformaldehyde resin SF-282 with the addition of urea-formaldehyde concentrate KF-85, hardener and hexamethylenetetramine /EN 2313551 C1, C09D 161/12, publ. 27.12.2007/. As a hardener liquid urea-formaldehyde concentrate taken an aqueous solution of formalin, ethylene glycol and carboxymethyl cellulose.
The disadvantage of the coating is that it was formed for a long time (about 20 hours).
The main task, which directed the claimed technical solution is the creation of brittle coatings based on synthetic resins possessing more resistant properties to hydrocarbon environments to assess the strength and safety of complex technical systems. In a thin layer of brittle coatings with the deformation observed pattern of cracks that reflect the greatest field principal stresses arising in the design, in the process of loading. Analyzing the pattern of cracks is possible to evaluate not only the loading of the different zones of the study design, but also to determine the level of these stresses with the use of the characteristics of the stress sensitivity of brittle coating.
When carrying out the invention to put the bedroom problem is solved at the expense of achieving a technical result, which is to reduce the time of drying (curing) of the coating.
This technical result is achieved by the fact that fragile testcountbytesinfile coating on the basis of artificial resins, made from a mixture containing resorcinolformaldehyde resin grade SF-282 with the addition of urea-formaldehyde concentrate UFC-85 and hardener liquid urea-formaldehyde concentrate coolant-102, which used a mixture of formalin, ethylene glycol and starch, with 100 mass parts resorcinolformaldehyde resin SF-282 components are taken in the following ratio, %: urea-formaldehyde concentrate UFC-85 - 35-50; hardener coolant-102 - 22-25, respectively.
The proposed coverage is also created on the basis of artificial resins - resorcinolformaldehyde brand SF-282 with the addition of urea-formaldehyde concentrate UFC-85, but as a hardener liquid taken a mixture of formalin, ethylene glycol and starch coolant-102.
Resin SF-282 THE 6-07-402-90 is the product of the polycondensation of resorcinol with formaldehyde in the environment of ethyl alcohol, ethylene glycol, and an aqueous solution of alkali.
UFC-85 THE 2181-032-00203803-2003 used to prepare a varnish coating is an aqueous solution of formaldehyde and low molecular weight derivatives of the condensation of urea with formaldehyde.
RC-102 TI is the 74 (manufacturer Tyumen, Plastics plant) is a mixture of formalin, ethylene glycol - 52.8% and starch 2.0-3.0% per 100 mass parts of formalin and more reactive.
Novolak are thermoplastic, i.e. soluble and fusible, low molecular weight resin, predominantly linear structure with methylene groups between the phenolic nuclei. This composition is mixed under normal conditions, in parts by weight. The sequence of preparation of a varnish covering: measured the required number SF-282, then stirring, is added to UFC-85, RC-102.
Technology of preparation of the coating is very simple, does not require certain expenses. The mixture is used immediately, using a lacquer coating. The coating is cured at a temperature of 0-50°C, humidity 0 to 95% within 10 hours. Conditions change only affects the speed of curing.
In the coating composition consists of 3 components (see table.), on 100 mass parts of SF-282 entered UFC-85, RC-102. The weight composition of the latter two components can be changed in the appropriate limits, since they are used for curing coatings and for stitching resorcinol of nofollow.
Calibration tests were conducted at air temperatures of 5, 10, 15, 25°C, humidity 18-70%.
For coating samples - steel No. 3 was used brush. When the calibration test sample konsolen is secured and loaded at the free end.
To obtain comparative data, the mixture was applied to a sample size of 285×20×0,6.
|Components||taken the quantitative content of the component per 100 mass parts resorcinolformaldehyde resin SF-282, %|
|Urea-formaldehyde concentrate CPK-CF - 85||35||40||45||50|
The change introduced into the composition ratio of urea-formaldehyde concentrate UFC-85 below 35% or above 50% reduces the sensitivity of the coating leads to plasticity, which reduces the quality of brittle coating. When the content of the hardener liquid coolant-102 consisting of more than 25% significantly increases its sensitivity to changes in temperature and humidity environment, which affects the curing of the coating and at the th cooling observed the appearance of shrinkage cracks.
Fragile testcountbytesinfile coating on the basis of artificial resins, made from a mixture containing resorcinolformaldehyde resin SF-282 with the addition of urea-formaldehyde concentrate UFC-85 and hardener liquid urea-formaldehyde concentrate, characterized in that as a hardener liquid urea-formaldehyde precondensate used a mixture of formalin, ethylene glycol and starch coolant-102 in the amount of 22-25 wt.% per 100 parts by weight of resorcinolformaldehyde resin SF-282, and urea-formaldehyde concentrate UFC-85 is taken in the amount of 35-50 wt.% per 100 mass parts resorcinolformaldehyde resin SF-282.
SUBSTANCE: holographic interferometre has a radiation source with a collimator, an objective lens, an object under analysis, a photoplate and an intermediate optical medium placed between the photoplate and the object under analysis. The intermediate optical medium is in form of a periodic structure of projections and depressions, which can be made with period of 200-5000 mcm and ratio of the side of the projection to distance between the projections equal to 1:10.
EFFECT: higher accuracy of measuring deformations of the flat surface of solid-state electronics elements.
3 cl, 11 dwg
SUBSTANCE: surface is illuminated with coherent light, digitised and the sequence of its video images is stored. A sample of N readings is formed for each point of the digitised image, containing the time variation of the illumination level and dispersion and mathematical expectation are then calculated for each sample, the ratio of which is then used to image the localisation zones of the surface deformation.
EFFECT: more accurate imaging of deformation localisation zones owing to use of high-resolution video cameras; higher information content of real-time imaging deformation zones and establishment of a direct relationship between measured values and values of rate of deformation in the analysed region.
FIELD: power industry.
SUBSTANCE: device includes in-series installed stations: of integrity check of items, two stations for dividing the items into two streams, control station of side surface and control station of ends surface of items, which are installed in each stream, as well as integrating station of streams of items. Integrity check station of items contains CCD chamber. Each station for dividing and integrating the streams contains optical sensor and stop for shaping and cutting off the post of items of the specified length. Control station of side surface contains rotating rolls, lighting device of controlled items and CCD ruler. Control station of end surfaces includes rotor divided with a groove into two parts in each of which there are slots for arrangement of items, two CCD chambers with built-in radiator to control the items. All the control stations are equipped with blowing devices of defective items as well.
EFFECT: automated, operational, high-reliable control of cylindrical objects for availability and character of surface defects, high efficiency of process operation of the control.
6 cl, 8 dwg
FIELD: weapons and ammunition.
SUBSTANCE: device for measurement of underground pipe deformation comprises measurement sensor, including at least one optical fiber of displacement measurement and at least one optical finer of temperature measurement, which are located under underground pipe hidden in ground, in direction of underground pipe. Also comprises measurement module, including generator-source of light connected to one end, at least of one optical fiber of displacement measurement and to one end of at least one optical fiber of temperature measurement intended for radiation of light, analyser of deformation measurement to measure length of light radiation wave reflected at least from one optical fiber of displacement measurement in real time intended for analysis of change of at least one optical fiber of displacement measurement, and analyser of temperature measurement to measure length of light radiation wave reflected from at least one optical fiber of temperature measurement in real time intended for analysis of change of at least one optical fiber of temperature measurement.
EFFECT: possibility to quickly analyse deformation of underground pipe and leakage from it by sections on surface, without damage of external part of underground pipe, by means of measurement sensor application.
15 cl, 12 dwg
SUBSTANCE: fibre-optic device for measuring the value and direction of transverse deformation of an object is proposed. The device includes the following components which are arranged in series and optically connected to each other: a common optical source; several light guides with detecting elements and an optical receiver with an electronic processing unit. The light guides are connected into a cable containing three light guides attached to the object under analysis. The light guides are low-mode light guides. At the input faces of the light guides in the cable, there are steps at the centre of the light guides which provide optical path difference of λ/2, where λ is the wavelength, and which lie at an angle 120° to each other. In front of the faces of the light guides, there polarisation filters which direct the polarisation plane perpendicular the steps on the faces of the light guides. The optical receiver is made from separate elements, each optically connected to a separate light guide in the cable.
EFFECT: device enables measurement of the value and direction of transverse deformation of an object.
SUBSTANCE: device contains a counterforce unit, equipped with a measurement unit, installation device with stiff and flexible drafts, connected to the counterforce unit; according to the invention, the counterforce unit executed as elastic rings according to number of a strain directions, stops, fixed on rings external surface pair wise and diametrically and oriented to strain directions accordingly, the installation device stiff draft is tube shaped, connected to rings with guides, oriented in the stop pairs fixing direction accordingly, the flexible located inside the tube and connected with rings in stops fixing places, at that the measurement unit executed as ring's strain individual recorders. The device significantly increase precision of measurements, because of the well cross section, in a single zone, along its length, several diametrical directions simultaneous strain recording.
EFFECT: precision of measurements increase because of strain recording in a single zone along its length, in a well cross section several directions simultaneously.
FIELD: measuring technology.
SUBSTANCE: facility consists of wide-band super-luminescent diode (SLD), radiation of which comes to the first pole of four-pole splitter via convertible spectral filter and via its fourth pole to the fist pole of three-band splitter, the second pole of which is connected with a calibrating cuvette, while the third pole is connected with the third photo-receiving device (PRGD). Output of the calibrating cuvette containing acetylene, is connected with an input of the second PRGD. Radiation from the third pole of the four-pole splitter comes to Bragg sensors, while radiation reflected from them comes to the input of the first PRD (photo-receiving device) via the third and the second poles. Outputs of PRD are connected with a computer via and analogue-digital converter; the computer determines spectre of acetylene attenuation by signals from the second and the third PRGD; and by the most contrast spikes it calibrates modulation of SLD spectre by means of which it calibrates signals from Bragg sensors picking-up the first PRD.
EFFECT: increased sampling frequency of Bragg sensors, also facilitation of increased number of sensors in facility.
7 cl, 10 dwg
SUBSTANCE: invention refers to mining engineering and is intended for measuring well deformations. Deformometre includes installation device in the form of a screw with a nut and screw turning device, spacer assembly connected to nut and rheostatic measuring assembly. According to invention, nut has device for being moved along screw; screw has swing lock pin; spacer assembly is made in the form of spring-loaded punch radially installed on nut, and measuring assembly is installed on punch.
EFFECT: improving accuracy of measurements by recording radial deformations throughout the well wall surface.
SUBSTANCE: invention is related to mining, to devices for measurement of deformations and contortions in wells and boreholes. Device comprises fixed contact in the form of twisted cylindrical spring. Inside of it there is a movable contact arranged in the form of elastic cylinder with sliders that are evenly distributed along circumference. Spring contacts are connected to registration device. Supports are fixed on external surface of spring turns. It is necessary to reduce spring diametre in process of device installation in well. For this purpose device is equipped with accessory for spring tension or accessory for axial twisting of spring.
EFFECT: simplified design and improved accuracy of measurement.
FIELD: oil-and-gas production.
SUBSTANCE: device contains casing, thrust unit and gaging unit with displacement pickup, located in casing sequentially, and controller, connected to gaging unit by conductor cable. Thrust unit consists of pivotally connected to each other measuring and thrust levers, tightened by spring. Free ends of thrust and measuring levers are connected to casing pivotally, and free end of measuring lever herewith - with ability of restricted axial movement in two longitudinal side grooves of casing. Nozzle of displacement pickup constantly interacts to free end of measuring lever.
EFFECT: reliability enhancement of its operation ensured by design simplification, removing of radial and axial clearances of thrust unit, oproviding of reliable contact of the device to the wellbore wall.
FIELD: strain-sensitive brittle coats for determination of strain and stresses in members of oil and gas chemical equipment and pipe lines.
SUBSTANCE: proposed coat contains resorcinal-formaldehyde resin CF-282 with addition of carbamide-formaldehyde concentrate CFC-85; used as hardening agent of liquid carbamide-formaldehyde concentrate is aqueous solution of formalin, ethylene glycol and carboxymethyl cellulllose and hexamethylene-tetramine; 100 parts by mass of resorcinal-formaldehyde resin contain the following components, %: carbamide-formaldehyde concentrate CFC-85, 35-50; hardening agent, 22-25; hexamethylene-tetramine, 3-6.
EFFECT: enhanced resistance of coat to aggressive media.
2 cl, 1 tbl, 4 ex