Modified bitumen and method thereof

 

(57) Abstract:

Usage: the invention relates to a new bitumen wagamama that can be used for the manufacture of coatings roads, bridges, airfields and other construction projects, and how to obtain it. Technical result: asphalt binder has a high level of adhesion to the mineral components of the basic and acidic character. The inventive obtained modified bitumen in the following ratio, wt.%: bitumen 80,00-92,00; the product of semi-coking coals 8,00-20,00; hexamethylenetetramine of 0.35 to 1.00 in excess of 100%. As a product of semi-coking coal is proposed to use thermal fraction >230°With the resin semi-coking coals. Modified bitumen is produced by mixing the source of the bitumen with the product of semi-coking coal at a temperature of 110°C to obtain a homogeneous mixture, which is injected a certain amount of hexamethylenetetramine, heated to 160°C and maintained at this temperature for 30 min without mixing. 2 S. and 2 C.p. f-crystals, 2 PL.

The invention relates to a new bitumen wagamama that can be used for the manufacture of coatings roads, bridges, aerod binder is an adhesive binder in relation to mineral materials basic and acidic nature, determining, in particular, the resistance of asphalt and grip in compositions for surface treatment pavement.

Oil road bitumen obtained according to GOST 22245-90 have low adhesion properties, so develop various additives to improve these properties and methods of modification of their bitumen.

Known use as adhesive additives to bitumen VAT residue production of synthetic fatty acids and their mixtures with kovovymi acid residues of cotton soap stock (A. C. of the USSR №1787994, publ. 15. 01.93 year). However, the use of this additive gives effect only for carbonate mineral materials.

Know the use of cationic adhesive additives to bitumen BP-3 - product interaction bottoms FLC (fraction21-C26) (acid component) with polyethylenepolyamine (main component) (Kutin Y. A. and other Rational directions of production of road bitumen. Bashkir chemical journal, volume 3, S. 31). Bitumen modified with additive of this type, securely bonded to the surface of mineral materials sour character.

The disadvantage of this additive is a weak improvement dobavki to bitumen by mixing tall oil and fentolamina resin at a ratio of, respectively, Mac.% (71-83):(17-29), at a temperature of 120-180°C. (patent RF №2096370, publ. 20.11.97).

Tall oil is a by technical product obtained in the production process of cellulose sulfate method, and fentolamina resin is a product of the interaction of alkyl phenols and amine compounds.

The disadvantages of this solution are the following:

- get supplements dramatically improve the adhesion of bitumen to the basic and acidic mineral materials;

the method of obtaining supplements complicated and energy-intensive;

- in addition to the costs of energy and time on getting supplements is additionally necessary expenses for the technological process of introducing it into the bitumen.

Closest to the claimed solution to the technical essence and the achieved result is modifying additive to bitumen and a method of obtaining modified bitumen, selected as a prototype, in which as an additive in asphalt used hexamethylenetetramine. The process is carried out by introduction of hexamethylenetetramine in an amount of 1-2% in the melt pre-oxidized bitumen with heat 44-65°C. the Mixture was incubated for two hours at a temperature of 160 to 180°C and is cooled by the dot number on the wet surface (patent RF №2021309, publ. 15.10.94).

The main disadvantages of additives used in this method are as follows:

she, somewhat improving the adhesion of bitumen to the acidic mineral materials, does not improve adhesion to the main mineral materials;

- with the introduction of the additive increases the viscosity of the bituminous binder, resulting in reduced penetration; reduced penetration leads to deterioration of the technological properties of the original bitumen which is essential for the production and application of asphalt and compositions for the surface treatment in certain climatic conditions;

- when the process temperatures (above 105°C) hexamethylenetetramine decomposes with evolution of gaseous formaldehyde, which degrades the environment.

It is known that the use of adhesive additives leads to changes in the rheological properties of the bitumen, i.e., changes in technological properties of bitumens, manifesting itself, in particular, to change their viscosity and penetration (Kuchma M. I. Surface-active substances in road construction. M.: Transport, 1980, S. 36,37).

Object of the present invention is to develop a new composition of bitumen viagraforteensui mixtures and compositions for the surface treatment of road surfaces and at the same time does not impair its technological characteristics, as well as its production method.

The invention aims to obtain a universal modified bitumen, exhibiting superior adhesive properties as basic and acidic mineral component of asphalt mixtures and compositions for the surface treatment.

The problem is solved by adding to the original bitumen product of semi-coking coals and hexamethylenetetramine in the following ratio, wt.%:

Bitumen 80,00-92,00

The product of semi-coking coals 8,00-20,00

Hexamethylenetetramine of 0.35 to 1.00 (over 100%)

As a product of semi-coking coal is proposed to use thermal fraction >230°With the resin semi-coking coals.

The claimed invention (the substance and the method of its production) are connected to form a single inventive concept, since the second invention is especially suitable for receiving the first.

Both inventions solve the same task with obtaining the required technical result (increase adhesion of modified bitumen) and, therefore, are linked to form a single inventive concept.

The method is realized in the following way.

Evaluation of the adhesion properties of the known and newly obtained modified bitumen was carried out as in fractions of the surface and in the points. Methods of evaluating adhesive binder in points, more objective, because taking into account a factor of the thickness of the adhesive film and the uniformity of its distribution over the surface of the mineral material. Evaluation of adhesion at the points produced by the method based on previously published, but several different methods: a) the methodology developed in Southborne (P. C. Safronov, A. I. Luckin. Road-building materials, Izd-vo “Transport”, M, 1966, page 135); b) the methodology proposed Gorlachevym N. In. and other (“Handbook of road-building materials”, Published in “Transport”, 1972, page 213).

The methodology used is as follows.

Individual particles of mineral material (crushed stone, gravel) dimensions not meet on a thin wire or thread, heat in thermostat for about 1 h at a temperature of 140-160°C and immersed in a Cup with astringent, heated to the same temperature at 15 C. Extracted from the binder particles suspended on a tripod for runoff of excess binder. Thereafter, they are cooled at a temperature of 20°With not less than 15 minutes Then treated with an astringent particles of crushed stone or gravel dipped in a glass of boiling (naburn) distilled water for 30 min and the force of adhesion of binder is determined by the scale shown in the table. 1.

As the source of the bitumen used oil road bitumen BND 90/130 according to GOST 22245-90, because it has optimal characteristics for specific climatic conditions of production and operation of asphalt and compositions for the surface treatment pavements based on it.

As additives used hexamethylenetetramine technical GOST 1381-73 and temperature fraction >230°With the resin semi-coking liptobiolith coal on THE 2221-004-02067942-2002 representing a liquid with a viscosity of 50 to 90 mm2/s at 50°C.

To assess adhesion of modified bitumen to basic and acidic mineral materials included in the composition of the asphalt mix, and accounted for the R as an additive - thermal fraction >230°With the resin semi-coking coals is due to the fact well-known fact that the low temperature resin (obtained by coking) solid fuels better combined with bitumen than high temperature (obtained by coking) (Lisicina A. I. Surface-active additives to improve water-stability of road surfaces with the use of bitumen and pitch. M: Autotransmit, 1959, 232 C.), and, in addition, the first contain surfactants acidic and basic structure, increasing the adhesive power.

The choice of thermal fraction >230°With the resin semi-coking coal is also due to the fact that this faction is missing and low-boiling volatile phenols (oxybenzone, Cresols), so, despite the relatively high operating temperatures get good reproducible results, and no contamination of the atmosphere.

In table. 2 shows the dependence of adhesion on modified bitumen and penetration on the composition of the bitumen binder.

In the absence of additives, the original bitumen has a low level of adhesion to mineral materials, especially acidic character (PL. 2, example 1) and is characterized by a stump leads to a noticeable improvement of the adhesion of the bitumen, but worsens its technological characteristics (table. 2, examples 2-4).

Introduction as an additive only product of semi-coking coals leads to a slight improvement of the adhesion of the bitumen, but dramatically alter its technological characteristics, primarily plasticization (PL. 2, examples of 5.6). This affects the reduction of the viscosity of the bitumen, which is manifested in increased penetration. Significant improvement in adhesion of modified bitumen does not occur, despite the presence of a specified product of semi-coking coals substances with functional hydroxyl, carboxyl and carbonyl groups. Some improvement in the adhesion of the described compounds is explained by the appearance of small quantities of substances with active terminal functional groups (example 6), but the cardinal (i.e., at least four points) improve adhesion does not occur.

Only the introduction to the bitumen - thermal fraction >230°With the resin semi-coking coals certain amount of hexamethylenetetramine leads to a significant improvement of the adhesion properties of the thus obtained modified bitumen (the dominant additive due to the presence of polar compounds with different functional groups; however, this does not lead to unbalancing the structure of the bitumen. With the introduction of the second Supplement, the formation of hexamethylenetetramine in the amount of phenol and fentolamina oligomers. In the adsorption interaction of the resulting oligomers with petroleum bitumen asphaltenes formed a new dispersed structure. This is confirmed by the experimental fact of appearance of the modified bitumen elasticity at 0 and 25°C (30-35%), which is quite unusual for the original bitumen, respectively (2-4%). The manifestation of elasticity, properties characteristic of polymeric structures (for example, for polymer-bitumen binders), confirms the formation of polymer molecules in first obtained modified bitumen.

In example 9 (table. 2) the optimal composition of modified bitumen, which gives the maximum value of adhesion for basic and acidic mineral materials while maintaining the values of penetration of the original bitumen.

It was established experimentally that the introduction of thermal fraction >230°With the resin semi-coking coal at less than 8% is not possible to achieve a significant increase in adhesion sposobnosti more than 20% of the economically inefficient, because it requires an increase of the additive of hexamethylenetetramine to achieve the same results. The size of the additive of hexamethylenetetramine is determined by the values of penetration source of bitumen, the number of product semi-coking coals and the required penetration of the obtained modified bitumen.

The main feature of the first invention (matter) is to obtain previously unknown modified bitumen, having good adhesion to the basic and acidic mineral component of asphalt mixtures and compositions for the surface treatment, which is obtained in the following ratio, wt.%:

Bitumen 80,00-92,00

The product of semi-coking coals 8,00-20,00

Hexamethylenetetramine of 0.35 to 1.00 in excess of 100%

The claimed technical solution of the second invention (method) has the following distinctive features:

- use as an additional additive to bitumen for its modifications to improve the processing characteristics in addition to the hexamethylenetetramine product of semi-coking coal;

- establishing the sequence of technological operations is eimi additives to obtain the modified bitumen with a high level of adhesion to mineral materials of different nature while maintaining or even improving the technological properties of the original bitumen.

These distinctive features not found by the applicants in the available sources of information, hence the claimed invention is novel.

Distinguishing features of the claimed invention in conjunction with the known result in the emergence of a new quality modified bitumen to improve its adhesion to mineral components of asphalt mixtures and compositions for the surface treatment of the basic and acidic character. The causal connection of distinctive features and achieved technical result of the claimed technical solution indicates criteria of “inventive step”.

The results of these studies show the possibility of implementing the proposed technical solutions, leading to the modified bitumen with stable values of adhesion to mineral materials basic and acidic nature.

The advantages of the claimed invention include:

- improvement of the ecological conditions of production and application of the developed modified bitumen;

- the possibility of varying both additives to obtain b is the overall hexamethylenetetramine, characterized in that it further comprises the product of semi-coking coals in the following ratio, wt.%:

Bitumen 80,00-92,00

The product of semi-coking coals 8,00-20,00

Hexamethylenetetramine in excess of 100% 0,35-1,00

2. Modified bitumen under item 1, characterized in that as a product of semi-coking coal used in thermal fraction >230°With the resin semi-coking coals.

3. A method of obtaining modified bitumen, characterized in that the source of the bitumen is mixed with the product of semi-coking coal at a temperature of 110°C to obtain a homogeneous mixture, which is injected a certain amount of hexamethylenetetramine, with subsequent heating to 160°C and isothermal aging the mixture for 30 min with continuous stirring.

4. The method according to p. 3, characterized in that it get modified bitumen in the following ratio, wt.%:

Bitumen 80,00-92,00

The product of semi-coking coals 8,00-20,00

Hexamethylenetetramine in excess of 100% 0,35-1,00



 

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