RU2300542C1 - Bitumen-polymer mastic and a method for preparation thereof - Google Patents

Abstract

FIELD: manufacture of building materials.

SUBSTANCE: invention relates to composite building materials suitable as insulators in construction and maintenance of underground oil pipelines, petroleum product pipelines, and gas lines in summer and winter periods. Mastic according to invention contains, wt %: insulation bitumen (BNI-4) 51.0, building bitumen (BN-70/30) 40.7, divinylstyrene thermoplastic elastomer (DST-30R-01) 2.5, petroleum-origin plasticizing oil (PN-6Sh) 3.5, stearic acid (T-18) 0.8, and emulsifying surface active auxiliary substance (OP-10) 1.5. Mastic is characterized by being plastic to as low temperature as -28°C and can be used both for manufacturing insulating tape materials and to formation of insulation coating directly on pipelines.

EFFECT: increased plasticity and the same high degree of adhesion to steel, pain primer, and polymer tape.

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Description

The claimed group of inventions relates to the field of composite building materials, and more specifically to the production of insulating materials used in the construction and repair of underground pipelines, oil pipelines and gas pipelines in summer and winter.

There are various bitumen-polymer compositions intended for various applications in the construction and repair of industrial and civil structures (see, for example, RF patents for inventions No. 2141494, 2258721, 2258722, etc.). However, the use of such compositions for the manufacture of insulating materials for pipelines due to a number of their features is impossible.

The closest solution to the claimed solution on the technical nature and the achieved effect of its use is the well-known bitumen-polymer mastic according to the patent of the Russian Federation No. 2241897, F16L 58/12, C08L 95/00, 2004. This mastic contains a mixture of bitumen BND-60/90 and BNI-4 or BN-70/30, divinylstyrene thermoplastic elastomer DST-30R-01, plasticizer, filler, modifier, petroleum resin and adhesive additive, for example, low molecular weight low-molecular weight polybutadiene.

In this case, the mastic has the following composition of components, wt.%:

Bitumen BND-60/90 8.5 ... 90.0 Bitumen BNI-4 1.0 ... 20.0 (or bitumen BN-70/30 1.0 ... 90.0) Divinyl styrene thermoplastic elastomer DST-30R-01 1,5 ... 5,0 Plasticizer 1,0 ... 5,0 Filler - 1,0 ... 8,0 petroleum resin 2.0 ... 8.0 Adhesive additive 0.3 ... 1.5 Modifier 1.0 ... 6.0

Such a bitumen-polymer mastic, although it has a rather high adhesion to the metal, however, has a relatively low ductility, which significantly limits the scope of its use for corrosion protection of pipelines.

The task to which the invention is directed is to improve the quality of corrosion protection of pipelines and increase their trouble-free service by improving the operational properties of insulating materials.

This problem is solved using the technical result from the use of the claimed invention, which consists in increasing the ductility of the insulating bitumen-polymer mastic with providing an indicator of brittleness temperature up to -28 ° С while maintaining a high degree of adhesion of the mastic both to steel and the primer, and to the polymer tape.

This result is achieved by the fact that in the well-known bitumen-polymer mastic containing insulating bitumen BNI-4 (GOST 9812-74) and building bitumen BN-70/30 (GOST 6617-76), divinyl styrene thermoplastic elastomer DST-30R-01 (TU 3040327 -98) and plasticizer,

firstly, petroleum oil PN-6Sh (TU 38.1011217-89) is used as a plasticizer,

secondly, the target additives are additionally introduced into it: T-18 stearic acid and the OP-10 emulsifying surfactant,

thirdly, mastic has the following composition of components, wt.%:

Insulating bitumen BNI-4 51.0 Building bitumen BN-70/30 40.7 Divinyl styrene thermoplastic elastomer DST-30R-01 2,5 Plasticizer - Petroleum PN-6Sh 3,5 Targeted Supplements: stearic acid T-18 0.8 emulsifying surfactant auxiliary substance OP-10 1,5 one hundred%

A special composition and a special ratio of components can significantly increase the efficiency of using bitumen-polymer mastic by increasing its ductility.

The new composition of the mastic components with their special ratio, revealed experimentally, required the creation of a new method for the production of bitumen-polymer mastic.

Various methods are known for making insulating mastics.

Closest to the claimed method is a known method of manufacturing bitumen-polymer mastic according to the patent of the Russian Federation No. 2241897, F16L 58/12, C08L 95/00, 2004, which consists in mixing the components of the mastic in such a way that at first they prepare a mixture of road and insulating bitumen or building bitumen bitumen, then by heating to a temperature of 160 ... 170 ° C, this mixture is dehydrated, a mixture of bitumen is fed into the mixer and added to the last plasticizer, the resulting mixture is stirred at a temperature of 165 ... 175 ° C for 2.5 ... 3 5 hours until complete dissolution of the pla modifier, then add a filler, for example, rubber crumb, and mix the resulting mixture for 25 ... 35 minutes, then continue mixing and add an oil-polymer resin, a modifier, an adhesive additive and thermoplastic elastomer.

This method, although it allows the production of bitumen-polymer mastic, however, as practice has shown, in a number of applications the plastic properties of such mastic are insufficient to ensure high reliability of the insulation coating of pipelines operating in extreme conditions.

The task to which the invention is directed is to improve the quality of corrosion protection of pipelines and increase their trouble-free service by increasing the operational properties of insulating materials.

This problem is solved using the technical result from the use of the claimed invention, which consists in providing the possibility of high-performance manufacturing of insulating bitumen-polymer mastic with an increased degree of plasticity, providing an indicator of brittle temperature up to -28 ° C while maintaining a high degree of adhesion of the mastic to steel and primer, and to the polymer tape.

The proposed method for the manufacture of bitumen-polymer mastic includes two main stages:

I. PREPARATION OF BITUMINO-POLYMER CONCENTRATE,

during the preparation of which the insulating bitumen BNI-4 is modified with a 25% solution of DST-30R-01 divinylstyrene thermoplastic elastomer in toluene in the presence of a dispersant T-18 stearic acid at a temperature of 180 +/- 5 ° С for three hours to change the structure of the structure bitumen (crosslinking).

II. MASTIC COOKING,

during which, by mechanical mixing in a mixer at a temperature of 140 ... 160 ° C for three hours, a bitumen-polymer concentrate is combined with building bitumen BN-70/30, with an emulsifying surfactant auxiliary substance OP-10 and a plasticizer - oil ПН-6Ш oil with simultaneous distillation of toluene from mastic through a condenser-cooler.

As a result of the experiments, the following basic formulation of bitumen-polymer mastic with the most optimal combinations of components was obtained (The content of components in the above example is indicated in wt.%).

Example.

For the manufacture of bitumen-polymer mastic according to the most optimal formulation use: insulating bitumen BNI-4 (GOST 9812-74) - 51.0%, building bitumen BN-70/30 (GOST 6617-76) - 40.7%, divinyl styrene thermoelastoplast DST-30R-01 (TU 3040327-98) and the emulsifying surfactant auxiliary substance OP-10 (GOST 8433-81) - 1.5%.

In the process of testing the mastic and the method of its manufacture, various tests were carried out.

In particular, on the basis of chemical production No. 2 of Orgsyntez OJSC in the presence of representatives of VNIIST Institute LLC, a pilot batch of Bitcor-R bitumen-polymer insulation mastic was produced.

To prepare the thermoplastic elastomer solution, a batch apparatus with a turbine-type mixer was used at a temperature of 50 ... 55 ° C for 5 hours.

Bitumen-polymer concentrate was prepared in a horizontal cylindrical apparatus with a paddle mixer.

During the loading of the thermoplastic elastomer solution into the foaming apparatus, the reaction mass was not observed.

During the manufacture of mastic, BNI-4 insulating bitumen was modified with a 25% solution of DST-30R-01 divinylstyrene thermoplastic elastomer in toluene in the presence of a dispersant T-18 stearic acid at a temperature of 180 +/- 5 ° С for three hours.

Then, with a working mixer and a temperature of 140 ... 160 ° C, building bitumen BN-70/30, an emulsifying surfactant OP-10 and a plasticizer, PN-6Sh petroleum oil in accordance with the recipe, wt.% Were introduced into the apparatus, wt.%:

Insulating bitumen BNI-4 51.0 Building bitumen BN-70/30 40.7 Divinyl styrene thermoplastic elastomer DST-30R-01 2,5 Plasticizer - Petroleum PN-6Sh 3,5 Targeted Supplements: stearic acid T-18 0.8 emulsifying surface active auxiliary substance OP-10 1,5 one hundred%

The mastic was cooked for 3 hours at a temperature of 140 ... 160 ° C with simultaneous distillation of toluene from the mastic through a condenser-cooler.

Control over the stages of the process and analysis of the quality of the finished product was carried out by the factory laboratory, which is equipped with all the necessary devices for testing.

In the process of conducting research, the following results were obtained:

N N  The name of indicators Norm for technical conditions Analysis result one. Appearance, color Homogeneous, without visible impurities, black Compliant 2. Softening temperature according to the "Ring and Ball" method, ° С, not less 75 85 3. The penetration depth of the needle is 0.1 mm, at a temperature of 25 ° C, not less than 25 28 four. The brittle temperature of the mastic layer, ° C, not higher minus 20 minus 28 5. Water saturation,%, no more 0.2 0.1 6. Adhesion to steel during shear (shear strength) MPa not less, at temperature: plus 20 ° C 0.2 0.25 Minus 15 ° C 0.25 0.25 7. Adhesion of a polymer tape in an overlap at a temperature of 20 ° C, n / cm, not less than 10 15.7

The finished mastic was drained into cardboard boxes with a release coating. For cooling the mastic, special areas were allocated.

The present invention allows:

1. To improve the quality of corrosion protection of pipelines, including oil and gas pipelines, as well as oil product pipelines and significantly increase their trouble-free service life by significantly increasing the ductility of the insulating material.

2. To increase the ductility of the mastic with the provision of an indicator of brittleness temperature up to -28 ° С while maintaining a high degree of adhesion of the mastic to both steel and primer, and to the polymer tape.

3. To ensure the use of mastic both for the production of insulating tape materials and for the formation of insulating coatings directly on pipelines.

Claims (2)

1. Bitumen-polymer mastic containing insulating bitumen BNI-4, building bitumen BN-70/30, divinyl styrene thermoplastic elastomer and plasticizer, characterized in that the oil PN-6Sh is used as a plasticizer and target additives are added to it: stearic acid T-18 and an emulsifying surfactant auxiliary substance OP-10, while the mastic has the following composition of components, wt.%: Insulating bitumen BNI-4 51.0 Building bitumen BN-70/30 40.7 Divinyl styrene thermoplastic elastomer DST-30R-01 2,5 Softener petroleum oil PN-6Sh 3,5 Targeted Supplements: stearic acid T-18 0.8 emulsifying surfactant excipient OP-10 1,5 2. A method of manufacturing a bitumen-polymer mastic, which consists in the fact that first, to change the structure of the structure of bitumen (crosslinking), a bitumen-polymer concentrate is prepared, during the preparation of which the insulating bitumen BNI-4 is modified with a 25% solution of DST-30R- divinyl styrene thermoplastic elastomer 01 in toluene in the presence of a dispersant - stearic acid T-18 at a temperature of 180 +/- 5 ° C for three hours, after which, by mechanical mixing at a temperature of 140 ... 160 ° C for three hours, a bitumen-poly compound a measuring concentrate with building bitumen BN-70/30 and with an emulsifying surfactant auxiliary agent OP-10 and a plasticizer oil PN-6Sh with simultaneous distillation of toluene from mastic through a condenser-cooler.