RU2617170C1 - Sealing liquid - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: sealing liquid contains, in wt %: polyisobutylene the molecular weight of 18-20⋅10⁴ - 3.5-3.6, methyl-2.6-di-tret-butylphenol - 0.3-0.5, tall oil fatty acids modified by chlorophyll derivatives - 5.0-5.5, a condensation product of oleic acid with diethanolamine and boric acid, neutralized by a potassium hydroxide solution - 0.3-0.5, petroleum oil with the kinematic viscosity at 50°C of 12-50 mm²/s - up to 100.

EFFECT: creating a new sealing liquid composition having high performance properties, in particular by thermo-oxidative stability and anticorrosion indices.

2 tbl

Description

The invention relates to sealing liquids (non-drying anaerobic sealants) designed to protect against corrosion of hot water storage tanks of energy enterprises and the water contained in them from oxygen saturation.

When storing deaerated water in storage tanks, it is saturated with atmospheric oxygen. High water temperature (95-98 ° C) and even a small air content in it cause intense corrosion destruction of metal pipelines and other equipment of the heating system. At the same time, water quality is deteriorating due to contamination by corrosion products.

To eliminate these drawbacks, sealing liquids are used, which create a floating layer on the mirror surface of deaerated hot water that protects against water saturation with atmospheric oxygen, and form a continuous film on the walls of the storage tank that protects the metal surface from corrosion.

Known sealing liquid to protect deaerated water and hydrophilic liquids from evaporation, saturation with contaminants and protect equipment from corrosion, which contains high molecular weight polyisobutylene and ceresin in the amount of 1-3.5 and 0.3-0.6 wt.h. per 100 parts by weight petroleum oil. The liquid may further comprise polyethylsiloxane liquid and / or polyurethane rubber (RU No. 2109028, 1998). This liquid has increased thermal stability, but tends to form stable aqueous emulsions due to the content of polysiloxane liquid in the composition. The composition of the base base, which includes petroleum oil and polysiloxane liquid, does not affect the thermal stability of high molecular weight polyisobutylene and does not improve the anticorrosive properties of the sealing liquid.

One of the ways to increase the thermal oxidative stability and anticorrosive properties of sealing liquids is to introduce antioxidant additives and corrosion inhibitors into their composition.

Closest to the invention is a sealing fluid of the composition, wt.%: High molecular weight polyisobutylene 2.5-3.3, inden-coumarone resin 0.8-1.1, antioxidant is the product of the condensation of formaldehyde with ortho-tert-butyl-paracresol 0.05- 0.14, ceresin - wax, the product of the de-oiling of petrolatums from the dewaxing of residual oil raffinates 0.93-0.95, 4-methyl-2,6-ditretic butylphenol 0.3-0.5, the product of the modification of sunflower oil with diethanolamine condensate with boric acid 0.3-0.5 and industrial oil up to 100 (RU No. 2163918, 2001).

A disadvantage of the known sealing fluid is its reduced thermo-oxidative stability and relatively low anticorrosion properties. Thus, the known fluid is not effective enough.

The objective of the invention is to increase the effectiveness of the sealing fluid.

The problem is achieved by the described sealing fluid containing, wt.%, High molecular weight polyisobutylene with a molecular weight of 18-20⋅10 ⁴ , tall oil fatty acids, modified chlorophyll derivatives, 4-methyl-2,6-di-tert-butylphenol, condensation product oleic acid with diethanolamine and boric acid, neutralized with a solution of potassium hydroxide and oil with kinematic viscosity at 50 ° C - 12-50 mm ² / s, taken in the following ratio, wt.%:

high molecular weight polyisobutylene with molecular weighing 18-20⋅10 ⁴ 3,5-3,6 tall oil fatty acids, modified chlorophyll derivatives 5.0-5.5 4-methyl-2,6-di-tert-butylphenol 0.3-0.5 oleic acid condensation product with diethanolamine and boric acid, neutralized potassium hydroxide solution 0.3-0.5 petroleum oil with kinematic viscosity at 50 ° С - 12-50 mm ² / s the rest is up to 100

The technical result achieved in solving the problem is to increase the operational properties of the sealing fluid, in particular, increase the thermal oxidative stability and anti-corrosion performance.

The following is a description of the components used in the described sealing fluid:

- high molecular weight polyisobutylene with a molecular weight of 18-20⋅10 ⁴ , for example, grade P-200 (GOST 13303-86);

- atmospheric corrosion inhibitor FMT - a product based on tall oil fatty acids (GIT) modified with chlorophyll derivatives (HRP) (RU No. 2256005, 2005, RU 97101732, 1997). The chemical composition of the gastrointestinal tract (fatty acids of tall oil),% wt .: saturated fatty acids C ₁₂ -C ₂₆ - 6-19; oleic acid - 28-51; linoleic acid - 37-64. Chemical composition (HRP),% wt .: chlorophyllins, pheophytin, pheoforbid, chlorin - 4.4-5.0; saturated and polyunsaturated fatty acids - 47.0-50.0; phytosterols, carotenoids - 1.0-3.0; macro- and microelements - 15.0-20.0; mannitol - 5.0-6.0; microcellulose - 18.0-21.0; amino acids and proteins - 1.0-2.0. The product has the following indicators: appearance - a homogeneous oily liquid; smell - close to the smell of needles; color - from dark green to dark brown; mass fraction of water - traces; authenticity: characteristic absorption bands of chlorophyll derivatives in the range, nm, 400-430; 630-670;

- 4-methyl-2,6-di-tert-butylphenol - Agidol-1 (GOST 10894-76) (butylated hydroxytoluene or ionol) - a colorless crystalline substance, the most common antioxidant additive of the alkyl phenol (ashless) type. Available in accordance with TU 38.5901237-90 with rev. 1,2. Melting points 69.5-70, crystallization 69 ° C. Obtained by alkylation of phenol with isobutylene at a temperature not exceeding 100 ° C and elevated pressure. Then, at 80-100 ° C, aminomethylation is carried out in methanol, after which dimethylamine is regenerated by hydrogenolysis and 2,6-di-tert-butyl-4-methylphenol is released;

- a condensation product of oleic acid with diethanolamine and boric acid, neutralized with a solution of potassium hydroxide - corrosion inhibitor TELAZ-K. The synthesis of the corrosion inhibitor TELAZ-K is carried out in two stages. At the first stage, an intermediate product is obtained (TU 2461-003-42408198-00) by heating the reaction mixture consisting of oleic acid, diethanolamine and boric acid (at a molar ratio, for example, 2: 3: 1, respectively) to 200-220 ° С with stirring until the evolution of H ₂ O ceases. The intermediate product is modified by introducing potassium hydroxide into the reaction mixture with constant stirring in a ratio of, for example, 5 g of KOH per 100 g of product obtained in the first stage at 160 ° C. The main physico-chemical parameters of the TELAZ-K corrosion inhibitor: amine number, mg Hcl / g - not less than 40, content of mechanical impurities,% wt., Not more than 0.15 and water,% wt., Not more than 0.5;

- petroleum oil with kinematic viscosity at 50 ° C - 12-50 mm ² / s, for example industrial oil (GOST 20799-88).

The described sealing liquid is prepared according to the following technology: cutting and rolling of polyisobutylene, swelling of polyisobutylene in 1/3 of the volume of industrial oil with kinematic viscosity at 50 ° C - 12-50 mm ² / s at a temperature of 20 ± 2 ° C for 12 h, stirring until polyisobutylene is completely dissolved at a temperature of 100-110 ° C, the introduction of the remaining industrial oil to obtain a composition with the required dynamic viscosity, cooling to a temperature of 60-70 ° C and the introduction of the above additives with stirring for 1.5-2 hours is necessary th concentration. At a temperature of 60-70 ° C, filtering the sealing liquid and draining the finished product.

The invention is illustrated by the following example, not limiting its use.

Example

Sealing liquid is prepared according to the above technology.

Table 1 shows the compositions of the sealing fluid containing components in various concentrations.

The results of comparative tests of a sealing fluid of various compositions for thermal oxidative stability and anti-corrosion properties are presented in table 2.

Evaluation of the effectiveness of the described sealing fluid is carried out in comparison with the above known.

The oxidation of protective liquids is carried out in steel plates on a Papok-R device when exposed to air oxygen, temperature and the catalytic effect of the metal at a temperature of 140 ° C for 6 hours. To assess the thermal-oxidative stability of protective liquids, the indicator “relative change in dynamic viscosity” at a temperature of 90 ° is used C after oxidation. The determination of dynamic viscosity is carried out on a rotational viscometer in accordance with GOST 1929-87 with a shear gradient of up to 100 s ^-1 .

The relative change in dynamic viscosity X _dv ,%, after oxidation is calculated by the formula:

- where η _d0 and η _d1 are the calculated values of the dynamic viscosity of the protective fluid before and after oxidation at a zero shear rate gradient, Pa⋅s.

Using standard laboratory methods for assessing the protective properties (GOST 9.054 -75), which allow to evaluate the anticorrosive properties of sealing liquids in various aggressive environments, namely:

- in sea water (test time 300 h);

- in distilled water (test time 300 h);

- when exposed to sulfur dioxide in a concentration of 0.015% vol. at a temperature of (40 ± 2) ° С and a relative humidity of 95 ± 2% for 24 hours (of which 7 hours exposure to sulfur dioxide and 17 hours moisture condensation on the samples).

For testing, steel plates are used. 3 dimensions (50.0 × 50.0 × 3.0) ± 0.2 mm. Surface preparation for applying protective fluids is carried out according to GOST 9.054-75.

The protective ability is evaluated by the change in the mass of the plate during the test.

The corrosion rate is calculated by the formula:

where V _p is the corrosion rate of the plate, g / (m ² ⋅ h); Δm is the average weight loss of the plates, g; S is the surface area of the plate, m ² ; T is the duration of the test, h

The protective effect of the sealing fluid is determined relative to the steel plate without coating according to the formula:

where Z is the protective effect of the material,%; V _po and V _p1 - corrosion rates of the plates without protective material and with the test material, g / (m ² ⋅ h).

The data given in the tables substantiate the effectiveness of the described sealing fluid. So, the test results show that the most optimal formulations of sealing liquids are formulations No. 2-5 (tables 1 and 2), which provide high thermal oxidizing ability and anticorrosion properties. At lower concentrations of the components used (composition 1), the desired effect is not achieved. With increasing concentrations of the components above the claimed (example 6) indicators of thermal oxidative stability and anticorrosion properties are at the level of indicators for sealing liquids of compositions 2-5.

Thus, the described sealing fluid has high performance properties, in particular high rates of thermal oxidative stability and anti-corrosion properties. So, the use of this liquid allows, for example, to increase its life in hot water storage tanks from 4 years to 5 years while maintaining high water quality.

Claims (2)

Sealing liquid containing high molecular weight polyisobutylene with a molecular weight of 18-20⋅10 ⁴ , tall oil fatty acids modified with chlorophyll derivatives, 4-methyl-2,6-di-tert-butylphenol, the product of the condensation of oleic acid with diethanolamine and boric acid, neutralized a solution of potassium hydroxide, and petroleum oil with a kinematic viscosity at 50 ° C of 12-50 mm ² / s, taken in the following ratio of components, wt.%: high molecular weight polyisobutylene with molecular weighing 18-20⋅10 ⁴  3,5-3,6 tall oil fatty acids, modified derivatives chlorophyll  5.0-5.5 4-methyl-2,6-di-tert-butylphenol  0.3-0.5 oleic acid condensation product with diethanolamine and boric acid, neutralized potassium hydroxide solution  0.3-0.5 petroleum oil with kinematic viscosity at 50 ° C 12-50 mm ² / s  the rest is up to 100