RU2439422C1 - Mastic bitumen-polymer composition for anticorrosion coatings and method of its production - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: bitumen-polymer composition consists of oil bitumen, elastomer, thermoplastic elastomer, plasticiser of resin and sulfur-containing compounds (sulfonated mixture of tall oil of HTM and LTM grades), corrosion inhibitor (compound of amines) at the following ratio of components, wt parts: bitumen from 85 to 95 inclusive; elastomer from 1.5 to 5 inclusive; thermoplastic elastomer from 2.0 to 4.5 inclusive; plasticiser from 1.0 to 4.0 inclusive; corrosion inhibitor from 0.2 to 3.5 inclusive. Also a method is described to produce the specified material.

EFFECT: increased service life of metal structures, achieved by efficient anticorrosion protection, by higher adhesion of mastic to metal and resistance to moisture and oxygen exposure.

3 cl, 5 tbl

Description

Field of application of the invention: industrial production of mastic bituminous compositions for corrosion protection of steel pipelines intended for transportation of gas, oil, water and other liquids, as well as metal tanks and oil storage facilities, industrial and civil construction, production of waterproofing materials. The resulting mastic bituminous materials with improved technical characteristics have a wide range of applications in various fields of the national economy, they are adaptable in production and use.

Various bitumen-polymer mastics are known, which include various additives: elastomers, thermoplastic elastomers, mineral fillers, plasticizers, adhesives, etc. Depending on the purpose and required characteristics, their ratios may be different. Methods of introducing components and their distribution in bitumen, the ratio of components determine the quality and scope of mastic compositions, as well as the manufacturability of the production process for their preparation. Distribution was received only by a limited number of developments: polymer-bituminous mastics of hot application MBR-G-90, MBR-G / Shm-75, TU 5775-002-11149403-97; rubber-bitumen composite mastics MRBK-I / D, TU 2384-003-40010445-2000; bitumen-polymer material RU 2248381; ASMOL TU 4859-001-05111644-95; TRANSKOR RU 2192578, used in road and civil engineering, as well as for corrosion protection of oil and gas pipelines.

The closest in technical essence is TRANSKOR bitumen-polymer mastic according to patent RU 2192578, includes bitumen, thermoplastic elastomer and plasticizer, divinyl styrene thermoplastic elastomer used as thermoplastic elastomer, a mixture of bitumen BND 60/90 and BNI-4 or BNI-4 / BN 30 / 70, and a modifier is additionally introduced into the composition of the mastic, with the following composition of components, wt.%:

bitumen BND 60/90 10-50,

bitumen BNI-4 40-80 or bitumen BN 30/70 40-80,

SBS modifier divinylstyrene thermoplastic elastomer DST 30R-01 1-10,

plasticizer industrial oil I40A 1-6,

rubber modifier PBN TU 38103641-98 1-7.

The disadvantages of bitumen-polymer mastic according to patent RU 2192578 are the presence of oil as a plasticizer in an unbound form, thinning the material, reducing the softening temperature, and subsequently during operation, under the influence of oxygen-ozone degradation, it oxidizes and dries and thereby loses its original physicochemical properties and operational characteristics. Mastic is characterized by a tendency to aging under the influence of oxygen.

The aim of the present invention is to increase the guaranteed life of metal structures and oil and gas pipelines, achieved by effective corrosion protection, by increasing the adhesion of the mastic to the metal and resistance to moisture and oxygen by introducing corrosion inhibitors into the mastic bitumen-polymer composition.

This is achieved by applying:

elastomers - rubbers of ethylene propylene and ethylene propylene diene, such as SKEPT, DSSK 2525;

thermoplastic elastomers, such as DST 30, DST 30R-01;

corrosion inhibitors such as diamines R-NH- (CH ₂ ) _{2 or 3} NH ₂ , amido amines R-CO-NH- (CH ₂ ) -NH- (CH ₂ ) _2- NH ₂ ; polyethylene polyamine NH ₂ C ₂ H ₄ (NHC ₂ H ₄ ) _n NH ₂ where n = 1-5;

plasticizer - sulfonated tall oil.

In sulfonated tall oil, R-SO ₂ -OH alkanesulfonic acids are present, which allows thermal aging to control the aging of the bitumen-polymer mastic, which eliminates aging during operation and loss of quality of technical properties.

Alkyl sulfonates present in the composition of sulfonated tall oil additionally affect the surface-active properties of the mastic, which increases the ability of the material to wet the treated surface and enhance adhesion.

The objective of the present invention is solved by obtaining a bitumen-polymer mastic, consisting of a mixture of petroleum bitumen, elastomer, thermoplastic elastomer, corrosion inhibitor and plasticizer, and by the production method is realized by grinding the initial components in colloidal mills for physicochemical combination of the ingredients of the composition, compounding in reactors, chemical modifications in the activator in the following ratios by weight:

Oil bitumen BND 60/90 in accordance with GOST 22245-90 - from 85 to 95 incl .;

Elastomers: SKEPT - 40, 60 according to TU 38.103252-92, DSSK 2525 according to TU 38.40387-2007 - from 1.5 to 5 incl .;

Thermoelastoplast DST 30P-01 according to TU 38.40327-98 - from 2.0 to 4.5 incl .;

Plasticizer - sulfonated tall oil of the HTM, LTM brand according to TU 13-0281078-119-89 - from 1.0 to 4.0 incl .;

Corrosion inhibitor - polyethylene polyamine according to TU 2413-214-00203312-2002 - from 0.2 to 3.5 incl.

The technology for producing a mastic bitumen-polymer composition is as follows.

1.1. Granular elastomer and thermoplastic elastomer are mixed with bitumen and fed to a colloidal mill to obtain a homogenized mixture.

1.2. The resulting mixture is fed into a reactor with a stirrer, which has a jacket for heating, maintain a temperature of 110 to 120 ° C inclusive.

1.3. A corrosion inhibitor is then fed through a volumetric meter. Compounding is carried out using a mixer in a horizontal direction for 40-60 minutes.

1.4. After that, a plasticizer is introduced by a metering pump and compounding is carried out for 90 minutes.

1.5. Turn on the pump, which produces mixing the mixture in the vertical direction, feeding the mixture from the bottom of the reactor to the top. At the same time, the mixture is stirred horizontally with a reactor stirrer. The mixing of the lower and upper layers of the mixture. Stirring is carried out for 8 hours.

1.6. During pumping the mixture, it passes through an activator device, with a wall temperature of 160 to 170 ° C incl., Where the chemical modification of the reaction mixture takes place.

After sampling and checking for compliance with the declared TU indicators, the mastic is fed to the casting unit in a container.

Depending on the purpose of the bitumen-polymer mastic, the ratios of the incoming components vary to achieve optimal characteristics. The softening temperature is a determining indicator for determining the degree of readiness of the material and is regulated by the mixing time, the temperature of the process. The physico-mechanical properties of bitumen-polymer mastic allow it to be used for overhaul of engineering networks, pipelines, patching of roads, as well as for waterproofing and corrosion protection of reinforced concrete and metal structures, cars and other objects.

The invention is illustrated by the following examples.

The ratio of incoming components and the composition of the resulting bitumen-polymer materials.

Example 1

Table 1 Inbound components Amount kg BPM composition Amount, parts by weight Elastomer SKEPT-40 twenty Elastomer SKEPT-40 5,0 DST 30R-01 12 DST 30R-01 3.0 Bitumen 60/90 BND 356 Bitumen 60/90 BND 89 Tall oil 8 Tall oil 2 Polyethylene polyamines four Polyethylene polyamines one TOTAL 400 one hundred

Example 2

table 2 Inbound components Quantity kg BPM composition Amount, parts by weight Elastomer SKEPT-40 16,4 Elastomer SKEPT-40 4.1 DST 30R-01 18.0 DST 30R-01 4,5 Bitumen 60/90 BND 340 Bitumen 60/90 BND 85.0 Tall oil 16,0 Tall oil 4.0 Polyethylene polyamines 9.6 Polyethylene polyamines 2,4 TOTAL 400 one hundred

Example 3

Table 3 Inbound components Quantity kg BPM composition Amount, parts by weight Elastomer DSSK 2525 6 Elastomer DSSK 2525 1,5 DST 30R-01 6.8 DST 30R-01 1.7 Bitumen 60/90 BND 376 Bitumen 60/90 BND 95.0 Tall oil 6.4 Tall oil 1,6 Polyethylene polyamines 0.8 Polyethylene polyamines 0.2 TOTAL 400 one hundred

Example 4

Table 4 Inbound components Quantity kg BPM composition Amount, parts by weight Elastomer SKEPT-60 eighteen Elastomer SKEPT-60 4,5 DST 30R-01 8 DST 30R-01 2.0 Bitumen 60/90 BND 356 Bitumen 60/90 BND 89.0 Tall oil four Tall oil 1,0 Polyethylene polyamines fourteen Polyethylene polyamines 3,5 TOTAL 400 one hundred

Table 5 Table of the main technical indicators of bitumen-polymer material Name of indicator Example 1 Example 2 Example 3 Example 4 Prototype Softening point, T ° C, according to KiSh 98 one hundred 93 91 75 Needle penetration depth, 0.1 mm, at + 25 ° C 24 26 21 25 twenty Flexibility on a beam with a radius of R = 20 mm, ° C -28 -thirty -twenty -24 - Fraas fragility temperature, ° C -35 -45 -24 -31 -twenty Elongation, cm, at + 25 ° C 8.7 9.8 7.3 9.1 8 Character of separation cohesive cohesive cohesive cohesive Cohesive Adhesion to steel, MPa, at T = + 20 ° C 0.6 1,1 0.3 0.7 0.2 Water absorption within 24 hours,% by weight 0.1 0.1 0.1 0.1 0.2 Transient electrical resistance of the coating (steel-primer-mastic layer without a wrapper) at a temperature of plus 23 ± 2 ° C, Ohm · m ² , 10 ⁹ 10 ⁹ 10 ⁹ 10 ⁹ 10 ⁹ initial coating after 1000 hours exposure in 3% NaCl solution at a temperature of plus 60 ± 2 ° C. 10 ⁷ 10 ⁷ 10 ⁷ 10 ⁷ 10 ⁷

Claims (3)

1. Bitumen-polymer mastic, consisting of a mixture of oil bitumen, elastomer, thermoplastic elastomer, corrosion inhibitor and plasticizer, characterized in that it contains BND 60/90 as oil bitumen, SKEP T-40.60 or DSSK 2525 as an elastomer, as a thermoplastic elastomer - DST 30R-01, as a corrosion inhibitor - polyethylene polyamines, as a plasticizer - sulfonated tall oil of the HTM, LTM grade, in the ratio of components, parts by weight:
Oil bitumen BND 60/90 85-95 incl. Elastomer SKEP T-40.60 or DSSK 2525 1.5-5 incl. Thermoelastoplast DST 30R-01 2.0-4.5 incl. HTM, LTM sulfonated tall oil 1.0-4.0 incl. Polyethylene Polyamine Corrosion Inhibitor 0.2-3.5 incl. 2. A method of obtaining a bitumen-polymer mastic made from the reaction mixture, including:
- mixing petroleum bitumen with granular elastomers and thermoplastic elastomer, followed by feeding to a colloidal mill to obtain a homogenized reaction mixture;
- compounding in reactors with the supply of polyethylene polyamines and sulfonated tall oil;
- stirring the reaction mixture;
- carrying out chemical modification of the reaction mixture in the activator, briefly thermally acting on the reaction mixture and creating turbulence of its flow. 3. The method according to claim 2, characterized in that the mixing of the reaction mixture in the horizontal direction is carried out using a mixer, and in the vertical direction using a pump.