Brittle coat on base of artificial resins

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

 

The invention relates to the determination of deformations and stresses in the elements of oil and gas equipment and pipelines with testcustomer brittle coating that provides a vivid picture of the stress distribution on the surface of a large size, set the zone of maximum 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 a temperature of not less than 20°C and relative humidity of 40-60%. To accelerate the drying process can use incandescent lamps with a capacity of 500-1000 watts.

Known composition fragile testcustomermap coverage, including resinat barium, resinat manganese and EF the R rosin. Rosin coating hot applied devoid of shortcomings, but require certain costs associated with flame application /Patent RF №2058016, publ. 1996, BI No. 10/.

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 C./.

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 /Panska VK Testcustomer brittle coatings for field investigations of deformation. Dis. Kida. technology. Sciences. M., 1977/.

The use of fragile testcustomer coatings allows to identify the most stressed zones in parts and determination of deformation values to test its strength /Vasiliev E.I. Fragile glass testcustomer coating for analysis of the stress-strain state of structures operating in extreme conditions. Dis. Kida. technology. Sciences. M., 1998/.

However, the use of such facilities fragile testcustomer coatings limited red is the need to have coverage with the appropriate properties.

Known coating containing epoxy resin, phthalic anhydride, and dibutyl phthalate in a ratio of 1:0,4:0,01 /SU 1669991 A1, MKI5C21D 7/02, G01B 11/20, publ. 15.08.1991/.

Known polymer-based coating composition of epoxy resin and phthalic anhydride, taken in a molar ratio of (1-1,05):(2-2,08) /SU 1669991 A1, MKI4G01 11/20, publ. 23.10.1986/.

Known and used so far coatings do not have sufficient stability of the magnitude of the stress sensitivity under varying test conditions.

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 unlike natural for the analysis of deformations and stresses in the elements petrochemical apparatus provides a vivid picture of the stress distribution on the surface of a large size, set the zone of maximum concentration the emission voltage, to obtain data to assess the strength of the oil and gas resource devices in harsh environments.

The main task, which directed the claimed technical solution is the evaluation of the strength and safety of complex technical systems. In a thin layer of brittle coatings on the basis of phenol-formaldehyde resin with the deformation observed pattern of cracks that reflect the greatest field principal stresses arising in the design, in the process of loading. Analyzing paintings cracks, you can assess 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 the task is to create a fragile testcustomermap the surface structures for investigation of stresses under the strain.

The problem is solved due to the achievement of the technical result consists in increasing the resistance of the coating to aggressive environments.

This technical result is achieved by the fact that fragile testcountbytesinfile coating on the basis of artificial resins contains resorcinolformaldehyde resin SF-282 with the addition of urea-formaldehyde concentrate UFC-85, as hardener liquid carb is metaformatting concentrate aqueous solution of formalin, ethylene glycol and carboxymethyl cellulose, and hexamethylenetetramine, with 100 mass parts resorcinolformaldehyde resin components are taken in the following ratio, %: urea-formaldehyde concentrate UFC-85 - 35-50, hardener - 22-25, hexamethylenetetramine - 3-6.

In the coating composition consists of 4 components. On 100 mass parts resorcinolformaldehyde resin SF injected urea-formaldehyde concentrate UFC-85, hardener liquid urea-formaldehyde concentrate (RC) and hexamethylenetetramine (it has been). The weight composition of the last three components can be changed in the appropriate limits, since they are used for curing coatings and for stitching resorcinol of nofollow.

Resorcinolformaldehyde resin SF-282 (TU 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.

Urea-formaldehyde concentrate UFC-85 (TU 2181-032-00203803-2003) is used to prepare a varnish coating is an aqueous solution of formaldehyde and low molecular weight derivatives of the condensation of urea with formaldehyde.

Hardener liquid urea-formaldehyde concentrate coolant TEE # 74 (manufacturer Tyumen, Plastics plant) is an aqueous solution of formalin, ethylene glycol and carbon is metiltselljulozy.

Hexamethylenetetramine it has been (methenamine) is obtained from formaldehyde and ammonia, in aqueous solutions of hydrolyzed well. Used for stitching nofollow.

Resorcinolformaldehyde resin refers to Novolac resins, which are obtained by condensation of phenol with formaldehyde in an acidic medium (pH from 1 to 4), usually at a molar ratio of formaldehyde and phenol (0,75-0,85):1. Novolak are thermoplastic, i.e. soluble and fusible, low molecular weight resin, predominantly linear structure with methylene groups between the phenolic nuclei. Resorcinolformaldehyde resin is cured only with the help it has been.

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 the required amount of UFC-85, coolant and it has been (methenamine), which must first dissolve in ethyl alcohol.

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 0-95% for 20 hours. Conditions change only affects the speed of curing. The table presents data on the composition, parts

The change introduced what about the in 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 comprising more than 25% significantly increases its sensitivity to changes in temperature and humidity environment, which affects the curing of the coating and when it cools, there is the appearance of shrinkage cracks.

The content of urotropine more than 6% affects the curing of the coating increases the drying time.

Calibration tests were conducted at air temperatures of 5, 10, 15, 25°C.

For coating, the samples were used brush. When the calibration test sample is a console fix and load at the free end.

To obtain comparative data, the mixture was applied on the sample size 285×20×0,6.

Table
ComponentThe ratio of components in % per 100 mass parts resorcinolformaldehyde resin SF-282
1234
Urea-formaldehyde concentrate UFC-8535404550
Hardener RC22232425
Hexane lenteren it has been 3456

Fragile testcountbytesinfile coating on the basis of artificial resins, characterized in that the composition for coating contains resorcinolformaldehyde resin SF-282 with the addition of urea-formaldehyde concentrate UFC-85, as hardener liquid urea-formaldehyde concentrate is an aqueous solution of formalin, ethylene glycol and carboxymethyl cellulose, and hexamethylenetetramine, with 100 mass parts resorcinolformaldehyde resin components are taken in the following ratio, %:

urea-formaldehyde concentrate UFC-8535-50
the hardener22-25
hexamethylenetetramine3-6



 

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