Brittle coating based on resorcinol-formaldehyde resin

FIELD: chemistry.

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.

Table
Componentstaken the quantitative content of the component per 100 mass parts resorcinolformaldehyde resin SF-282, %
1234
Urea-formaldehyde concentrate CPK-CF - 8535404550
Hardener coolant-10222232425

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.



 

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