RU2543217C1 - Mastic composition and method of obtaining thereof - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: composition contains, wt %: oil bitumen or asphalt of propane tar deasphalting of liquid asphalt (PTD) - 86-90, processed absorbent of butadiene and isoprene production - 5-8, sulphuric acid - the remaining part. First oil bitumen or PTD is mixed with absorbent at temperature 100-110°C for 150-180 min, after which sulphuric acid is introduced into reaction mass by dripping at rate 40-50 kg/h at temperature of reaction mass 110-125°C. After that, obtained reaction mass is mixed for 120-150 min at temperature 125-130°C, then temperature is increased to 140°C, after which mixing is continued for 240-300 min. Then temperature of reaction mass is increased to 150°C with mixing for 240 min, after which obtained product is subjected to aging.

EFFECT: obtaining mastic composition with anticorrosion and waterproofing properties, possessing stable exploitation properties.

7 cl, 3 tbl, 2 ex

Description

The invention relates to a composition and a method for producing an anticorrosive and waterproofing mastic composition used to protect metal surfaces, in particular gas, oil and product pipelines, tanks, concrete and brick surfaces, and also as a component for the production of anticorrosion mastics, varnishes, enamels.

A known method of producing anticorrosion mastics based on asphalt-resinous oligomers (RU 2407773, publ. 27.12.2010). Anticorrosive mastic is obtained by conducting the process in a single technological cycle. The process involves loading bitumen at a temperature of 130 ° C. Then technical sulfuric acid is added dropwise for 1.5-2 hours at a temperature of 130 ° C. Next, the product is stabilized at 150 ° C for 4 hours. Then additives are added - technical oil, butyl rubber, thermoplastic elastomer - at a temperature of 140 ° C. In this case, the components are constantly mixed after each operation of the cycle from 60 to 180 minutes.

Known mastic composition is characterized by a limited scope and low heat resistance.

A known method of producing anticorrosive material (RU 2074224, publ. 02.27.1997), in which asphalt deasphalting tar is mixed with bottom residue of the production of isoprene from the stage of regeneration of dimethyl formaldehyde and with sulfuric acid. The process is carried out in stages. In the first stage at 120-125 ° C for 210 minutes, in the second stage at 150 ° C for 240 minutes, in the third stage at 160-180 ° C for 240 minutes Sulfuric acid is fed in the first stage evenly with a feed rate of 20-35 kg / h per ton of reaction mass. The process is carried out at a ratio of components, in wt.%: Asphalt 75-85, bottom residue 10-15, acid - the rest.

Mastic obtained in a known manner, has a low physico-chemical characteristics.

Closest to the technical nature of the claimed object of the invention are a method for producing asmole and its composition (RU 2443751, publ. 27.02.2012). Asmol is obtained by reacting bitumen or asphalt with an absorbent obtained in the production of butadiene, isoprene, isobutylene in gas separation plants (absorbent brand A-1), in the presence of sulfuric acid, in the following ratio of components: 75-85 wt.% Bitumen or asphalt deasphalting as propane ; 8-22 wt.% Absorbent and sulfuric acid - the rest. In the first stage, bitumen or asphalt is mixed with absorbent at a temperature of 100-115 ° C, after which sulfuric acid is added dropwise into the reaction mixture for 5-6 hours until the temperature of the mixture reaches 120-130 ° C. In the second stage, the resulting mixture is stirred for 2-2.5 hours, then the temperature of the mixture is increased to 135-140 ° C, after which it is stirred for 4-5 hours. In the third stage, the temperature of the mixture is increased to 145-155 ° C and when this temperature is reached, the mixture is stirred for 4-6 hours to form the target product.

In a known manner receive a mastic composition that does not have stable properties during its operation.

The objective of the present invention is to obtain a mastic composition with anticorrosive and waterproofing properties, while having stable performance properties, as well as optimizing the composition and method of production thereof, which allows to obtain a composition with desired performance, the use of industrial waste to reduce environmental pollution and ensure safe conditions labor.

The problem is achieved in that the mastic composition contains oil bitumen or asphalt propane deasphalting tar (hereinafter - APD), processed absorbent production of butadiene and isoprene, sulfuric acid in the following ratio of components, wt.%:

Oil bitumen or asphalt propane deasphalting tar 86-90 Absorbent 5-8 Sulfuric acid rest

Oil bitumen is selected from the group consisting of viscous petroleum bitumen BN 60/90/130, BND 60/90, BND 90/130, BND 200/300, BND 130/200, BND 40/60, BN 200/300, BN 130 / 200, BN 90/130, BN 60/90 according to GOST 22245-90. Viscous petroleum bitumen. The absorbent is a recycled absorbent for the production of butadiene and isoprene according to TU 2411-019-73776139-2009 or TU 38.103349-85 (brand A-2 absorbent), it is preferable to use a processed absorbent in the production of isoprene monomer for synthetic rubber according to TU 2411-019-73776139- 2009 (properties are given in table 2). However, it is preferable to use sulfuric acid with a concentration of 90-95%. Sulfuric acid in the process of obtaining a mastic composition is a sulfonating agent and a catalyst.

The task is also achieved by the fact that the method of obtaining a mastic composition includes the following stages: in the first stage, oil bitumen or AED is mixed with the specified absorbent at a temperature of 100-110 ° C for 150-180 min, after which sulfuric acid is introduced into the reaction mass by dropping through a metering washer at a speed of 40-50 kg / h at a temperature of the reaction mass 110-125 ° C. At this stage, an additional antifoam is added at the rate of 0.0001-0.0002 wt.% Per reaction mass. In the second stage, the resulting reaction mass is stirred for 120-150 minutes at a temperature of 125-130 ° C, then the temperature is increased to 140 ° C, after which it is continued for 240-300 minutes. In the third stage, the temperature of the reaction mass is increased to 150 ° C and when this temperature is reached, it is stirred for 240 minutes. Further, the product obtained is subjected to aging for at least a day in the winter time and at least two days in the summer time for the purpose of further stabilization.

The properties of the antifoam are given in table.3.

At the first stage, sulfonic acids and sulfonic polyaromatic compounds are formed, at the second stage isoprene oligomerization and polycondensation of oligomers with bitumen components, and the third stage is product stabilization.

The proposed mastic composition is applied to the treated surface in the molten state, in the form of rolled materials or in the form of a solution (for example, by dissolving in hydrocarbon solvents - petroleum solvent, unleaded gasoline). In the latter case, application is possible with a brush, spatula, airbrush. However, it is possible to apply the mastic composition to unprepared surfaces (for example, old bitumen and plastisol).

Changing the quantitative content of the components of the composition made it possible to obtain a final product that is stable throughout the life of the mastic composition, has improved physicochemical characteristics, has a wide scope, the claimed mastic composition has the necessary adhesion to a metal surface. Varying the quantitative content of the components of the composition in the claimed range of values allows to obtain a product with specified performance indicators (table. 1).

The invention is illustrated by the following examples.

Example 1

Stage 1: The calculated amount of BND 90/130 bitumen heated to a temperature of 100 ° C and absorbent grade A-2 according to TU 2411-019-73776139-2009 obtained in the process of producing isoprene monomer for synthetic rubber are fed into a heated reactor. The mixture was stirred at 100 ° C for 150 minutes. Then, sulfuric acid is introduced by dropping into the reactor through a metering washer at a rate of 50 kg / h, while the temperature of the reaction mass should not exceed 125 ° C, at the same time, an antifoam in the amount of 5 g per reaction mass is introduced.

The ratio of the components of the reaction mass is, wt.%:

Bitumen is road 88.35 Absorbent brand A-2 5.08 Sulfuric acid (95%) 6.57

Stage 2: the reaction mixture is stirred for 120 min at a temperature of 125 ° C. Then the temperature is increased to 140 ° C and the reaction mass is stirred for 300 minutes.

Stage 3: The temperature of the reaction mass is increased to 150 ° C and stirring is continued for 240 minutes. The resulting product for stabilization is aged within two days.

Example 2

Stage 1: The calculated amount of asphalt propane deasphalting tar (APD) heated to a temperature of 110 ° C and absorbent grade A-2 according to TU 38.103349-85 are fed into the heated reactor. The reaction mass is stirred at a temperature of 110 ° C for 180 minutes Then, sulfuric acid is introduced by dropping into the reactor through a dosing washer at a rate of 40 kg / h until the temperature of the reaction mass reaches 120 ° C, at the same time, an antifoam in the amount of 10 g per reaction mass is introduced.

The ratio of the components of the reaction mass is, wt.%:

Propane deasphalting asphalt tar (ADF) 87.72 Absorbent brand A-2 7.54 Sulfuric acid (90%) 4.74

Stage 2: the reaction mass is stirred for 150 min at a temperature of 130 ° C. Then the temperature of the reaction mixture was increased to 140 ° C and stirred for 240 minutes.

Stage 3: The temperature of the reaction mixture was increased to 150 ° C and stirring was continued for 240 minutes. The resulting product for stabilization is matured during the day.

Table 1 Physico-chemical characteristics of the mastic composition Name of indicator Example 1 Example 2 1. Appearance Homogeneous black mass without visible foreign matter 2. The softening temperature according to the method of "Ring and Ball", ° C 120 87 3. Fraas fragility temperature, ° C, Minus 25 Minus 22 4.Penetration (depth of penetration of the needle) at 25 ° C, 0.1 mm, 31 43 5. Elongation at 25 ° C, cm, 8.0 7.0 6. Adhesion to a metal substrate: No peeling from the substrate at (20 ± 5) ° C at minus (25 ± 5) ° C 7. The area of delamination at the cathodic polarization of the coating at 20 ° C for 30 days, cm ² 2,4 2.7 8. Solubility in solvent,% not less 99.9 99.9

table 2 Physico-chemical characteristics of the absorbent brand A-2 according to TU 2411-019-73776139-2009 Name of indicator Norm 1. Appearance Dark liquid without solids 2. Density at 15 ° C, g / cm ³ 0.80-0.95 3. Fractional composition: a) boiling point, ° C, not lower 60 b) end boiling point, ° C, not higher 370 c) the number of fractions boiling up to a temperature of 300 ° C,% vol., not less 45 4. Tests on a copper plate withstands 5. Mass fraction of actual resins during thirty-day storage, mg / 100 cm ³ 12000 6. Mass fraction of total sulfur,%, no more 1,0 7. Content of free water,%, no more absent

Table 3 Defoamer Properties Qualitative indicators Appearance Viscous transparent liquid from colorless to light yellow in color without mechanical impurities (opalescence is allowed) Conventional viscosity at 20 ° C 80-160 The reaction medium (pH of an aqueous extract) 6-8 (neutral)

Claims (7)

1. Mastic composition, including oil bitumen or asphalt propane deasphalting tar, absorbent and sulfuric acid, characterized in that the absorbent is a processed absorbent production of butadiene and isoprene, and the mastic composition contains components in the following ratio, wt.%:
oil bitumen or asphalt propane deasphalting tar 86-90 absorbent 5-8 sulfuric acid rest. 2. The composition according to claim 1, characterized in that sulfuric acid with a concentration of 90-95% is preferably used. 3. The composition according to claim 1, characterized in that it is preferable to use a processed absorbent for the production of isoprene for synthetic rubber. 4. A method of obtaining a mastic composition in three stages, including the first stage mixing petroleum bitumen or asphalt propane deasphalting with an absorbent material followed by sulfuric acid addition by dropping, characterized in that the components are taken according to claim 1, while the first stage mixing petroleum bitumen or asphalt propane deasphalting with an absorbent is carried out at a temperature of 100-110 ° C for 150-180 min followed by the introduction of sulfuric acid by dropping at a temperature of the reaction mass 110-125 ° C at a speed of 40-50 k g / h, in the second stage the resulting reaction mass is stirred for 120-150 min at a temperature of 125-130 ° C, then the temperature of the reaction mass is increased to 140 ° C, followed by stirring it for 240-300 min, in the third stage the reaction temperature the mass is increased to 150 ° C and upon reaching it, the reaction mass is stirred for 240 minutes, after which the resulting product is subjected to aging. 5. The method according to claim 4, characterized in that the resulting product is subjected to aging at least during the day in winter and at least two days in the summer. 6. The method according to claim 4, characterized in that in the second stage an additional antifoam is added at the rate of 0.0001-0.0002 wt.% Per reaction mass. 7. The method according to claim 4, characterized in that in the second stage the input of sulfuric acid is carried out by dropping through a metering washer.