Repair part

 

(57) Abstract:

The invention relates to filled with metal compositions based on epoxy resins intended for repair of metal surfaces, in particular pipelines. Repair composition comprises 100 wt.h. epoxy Dianova resin, 17-19 wt.h. polyoxypropyleneamine mol. weight 700, 14-15 wt. hours of polyoxypropyleneamine brand DA-500, 44-45 wt.h. amine hardener AF-2, 263-408 wt.h. dispersed filler is aluminum or its mixture with stainless steel, 6,6-48 wt.h. silicon dioxide as a rheological additive. Repair composition according to the invention is simple to prepare, easy to use and provides long-term operation of sections of the pipeline. 1 C.p. f-crystals, 1 table.

The invention relates to compositions based on epoxy resins, namely filled with metal compositions for repairing metal surfaces.

Known compounds of different types on the basis of epoxy resins (ES) for repair of various metal articles:

- epoxy composition with about 40. % stainless steel powder by weight ES (Japan's bid 90263875, class C 09 D 5/34, From 09 To 3/08, op. 1990), however, the low metal content of the filler due to the difference of the coefficients of the heat is the effect of variable temperature.

- the number of plasticized filled with metal compositions based Dianova ES, for example, a composition consisting of 100 wt. parts of ED-20, 25 parts of dibutyl phthalate, 11-12 parts polyethylenepolyamine and mixtures 150-200 parts of iron powder and 10 parts of aluminum powder (Century, Matorin and other Automotive materials. The Handbook. M.: Transport, 1989, S. 366).

However, such compositions are quite fragile and prone to wypadaniu plasticizer, which leads to changes in their physico-mechanical properties during operation.

Also known epoxy putty to fill in deep and shallow defects in devices that operate in moisture and malonarushennykh environments.

The filler consists of Dianov, ESTER, amine hardener, AF-2, aluminum filler and plasticizer dibutyl phthalate. According to these examples, the ratio of ES and filler by weight of 1:1 or less (patent RF 2100394, class C 09 D 5/34, op. 1997).

The number of General characteristics of this coating is adopted for the prototype.

However, due to the presence of plasticizer and not high enough filling metal the filler inherent in the above disadvantages.

The invention solves the problem of the development of epoxy repair is acacio gas stations.

The task is solved in that the epoxy filled with metal composition, including Dianova ES, hardener amine type AF-2 and the filler - dispersed aluminum powder, in comparison with the prototype further comprises polyoxypropyleneamine mol. weight 700, polyoxypropyleneamine and rheological additive silicon dioxide in the following ratio, wt. h:

Epoxy Dianova resin - 100

Polyoxypropyleneamine - 17-19

Polyoxypropyleneamine - 14-15

Hardener AF-2 - 44-45

Aluminum powder or a mixture powder of stainless steel - 263-408

The rheological additive of the class of silica - 6,6-48,0

Mixed the hardener is taken in stoichiometric amount of epoxy component of the composition (Dianova ES and polyoxypropyleneamine), but is probably insignificant (1%) deviation from stoichiometric amount, with larger deviation of physico-mechanical properties of the composition deteriorate used binder (epoxy and amine components of the composition) increases the elasticity of the composition and does not require a plasticizer to increase the degree of filling and to achieve the desired consistency of the filled composition. In addition, the mass (and volume is prigotovlenii. Filling epoxy and amine components in the same ratio reduces the cooking mixture to the mix and mixing 2 volumes of epoxy and 1 volume of amine components.

As filler in addition to aluminum powder can be used and its mixture with a powder of stainless steel in the optimal ratio of 1:2,2-2,6.

The specified amount of filler in the composition achieves thermal expansion coefficient of repair compound, close to the same ratio of metal. The upper limit of the filler is determined by the properties of the binder. Less than the above amount of filler does not provide the desired consistency and leads to the change of the coefficient of thermal expansion.

Rheological additive within these limits prevent the settling of the filling and draining of composition with vertical surfaces.

The composition may contain other additives target, in particular pigments, which do not affect performance, but can be entered to give it color.

EXAMPLES

Repair composition are well-known components:

- apex - hardener polyoxypropyleneamine YES-500 (TL6-02-1235-82),

- hardener AF-2 is the product of the interaction of formaldehyde, phenol and ethylene diamine (TU 6-05-1663-74).

As filler are used most available and widely used powders of aluminum and stainless steel dispersion of 20-200 microns.

The composition is prepared as follows.

In the mixer of any type suitable for mixing viscous products, loaded the estimated number of ES and 2/3 of the required amount of filler and rheological additives. Similarly prepared amine component with 1/3 of filler and additives. The obtained components are stored in sealed containers.

Before applying the measure 2 parts (weight or volume) filled with epoxy component and 1 part filled with the amine component are mixed and applied with a spatula to place, subject to repair. The time of gelation is not more than 4 hours, the time before the start of operation of 20 hours.

The most important operational characteristic by which to judge the suitability of the composition, is the pressure inside the pipe, while maintaining the integrity of the repaired connection.

The test composition was carried out on pipes with an inner diameter of 50 mm, cordewener to loss of containment. The tests were carried out on the bench for hydraulic tests. The obtained data are presented in the table.

As can be seen from the data given in the table, the repair composition may be recommended for use in the repair of gas pipelines for low and medium pressure, as well as for repairs in the shop and field conditions for elimination of defects of different origin instead of welding, soldering and construction for the oil and gas industry, machinery, technological equipment and in the urban economy.

1. Repair composition comprising epoxy Dianova resin, amine hardener brand AF-2 and dispersed aluminium-containing filler, characterized in that it further comprises polyoxypropyleneamine mol. m 700, polyoxypropyleneamine brand DA-500 and the rheological additive of the class of silicon dioxide in the following ratio, wt. including :

Epoxy Dianova resin - 100

Polyoxypropyleneamine mol. m 700 - 17 - 19

Hardener AF-2 - 44 - 45

Polyoxypropyleneamine YES-500 - 14 - 15

Dispersed aluminium-containing filler - 263 - 408

Rheological additive - 6,6 - 48

2. Repair composition under item 1, OTS with stainless steel in a ratio of 1: 2,2-3,8.

 

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