Polymer-asphalt binder and method thereof

 

(57) Abstract:

Usage: the invention relates to a new polymer-bitumen wagamama that can be used for the manufacture of coatings roads, bridges, airfields and other construction projects, and how to obtain it. Effect: astringent has a high level of adhesion to mineral materials basic and acidic character. The inventive resulting polymer-asphalt binder, in the following ratio, wt.%: bitumen 54,0 - 88,0, copolymers of butadiene and styrene of 2.0 to 6.0, a product of semi-coking coals 10,0 - 40,0, hexamethylenetetramine 0,1 - 2,0 in excess of 100%. As a product of semi-coking coal is used thermal fraction >230°With the resin semi-coking coals. Polymer-asphalt binder receive the following way. First get a mixture of the product of semi-coking coals with blockcopolymers of butadiene and styrene at a temperature of 80°C, maintain it for two hours and heated with stirring to 120°C, then the resulting mixture was fed bitumen heated to a temperature of 110°C, and continuing the stirring, enter hexamethylenetetramine at a temperature of 110°C, after which the temperature of the mixture was raised to 160° the I to the materials used in the construction of roads, bridges, airfields, etc., namely polymer-bitumen wagamama (WSP) for the road surface and method of its production.

Any binders for asphalt concrete, including polymer-bitumen binders must have good adhesion to mineral materials used in this polymerisation mixtures or compositions for the surface treatment to provide the desired ratio of long-term water resistance of the material and its long-term operation in the floor or in another design without breaking and peeling. It is known that developed in the RF polymer-bitumen binders based on copolymers of butadiene and styrene (SBS) have a very low level of adhesion to the acidic mineral materials [Polymer-bitumen binder materials for road construction. Survey information. Informatton state road service of the Ministry of transport of Russia, vol.4, a-M., 2002, S.: 63, 67, 69, 76, 77; table: 17, 20, 21, 24, 25].

Closest to the claimed solution to the technical essence and the achieved result is asphalt binder for pavement and method thereof [RF patent №2038360, publ. 27.06.95], wybran also additive, which used industrial oil; these components are contained in the following amount, wt.%:

Bitumen 44,4-98,0

The copolymers of alkadienes and styrene 0.1 to 22,3

Oil industrial 1,9-33,3

It is possible as copolymers of alkadienes and styrene to apply a compound selected from the group comprising copolymers of butadiene and styrene or copolymers of isoprene and styrene. Possible other percentage of the known components.

The main disadvantage of bitumen obtained by this method is low adhesiveness to mineral materials pavement acidic nature.

This is caused by the use as an additive nizkoposhibnogo plasticizer - industrial oils, which facilitates the process of homogenization of the polymer in the bitumen, but weakens the internal structure of bitumen and polymer due to impoverished polar compounds.

A method of obtaining a well-known prototype of bitumen for road surfacing includes a two-stage process: block copolymers of alkadienes and styrene in an amount of 0.1-22.3 wt.% mixed at a temperature of 110-160䔢,0 wt.% bitumen.

The main disadvantages of the method of obtaining a bituminous binder on the prototype are the following:

the method makes it possible to vary one or two components to obtain a binder with the desired properties, as well as to adjust the composition after storage;

when this technology is experiencing technological difficulties in dosing and transport via pipelines separately prepared viscous solution blockcopolymer butadiene and styrene in the industrial oil.

Object of the present invention is to develop a new polymer-bitumen binder on the basis of the SBS with a high level of adhesion to mineral materials and basic, and acidic nature, as well as its production method.

The problem is solved in that in the known bituminous binder for pavement instead of industrial oils used in the product semi-coking coals, namely thermal fraction >230°With the resin semi-coking coals, and additionally as a structuring additives used hexamethylenetetramine, in the following ratio, wt.%:

Bitumen 54,0-88,0

The Copolymers

b the top 100%

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.

This new technical solution to all your set of essential features allows to obtain a polymer-asphalt binder, which, along with good physical and mechanical properties, in particular, the softening temperature, embrittlement temperature, an interval of health, elasticity, characterized by a high level of adhesion to mineral materials of both basic and acidic nature.

The method is realized in the following way.

In becompletely boiler, equipped with a mechanical paddle stirrer, submit the necessary number of temperature fraction >230°With the resin semi-coking coals heated to a temperature of 80°C. Then upload metered quantity of blockcopolymer butadiene and styrene in the form of powder or granules, is maintained at the specified temperature for at least 2 hours for the swelling and then stirred the mixture at temperatures up to 120°C to a homogeneous condition. Then with continuous stirring served bitumen, nes introduce small portions of the calculated amount of powdered hexamine at a temperature of 110°C and stirring to obtain a homogeneous mixture, then the temperature is slowly increased to 160°C and stirred for 0.5 hour.

Evaluation of the adhesion properties of the known and newly developed polymer-bitumen binders produced in the scores on the methodology developed in Southborne [P. C. Safronov, A. I. Luckin. Road-building materials, Meters, Vehicles, 1966, S. 135].

To assess adhesion polymer-bitumen binders (WSP) to basic and acidic mineral materials used marble and porphyry gravel, respectively.

The advantages of the present invention is a new polymer-bitumen binder obtained by the proposed method can be viewed on concrete examples. To obtain WSP according to the present invention used oil road bitumen according to GOST 22245-90 with the depth of penetration of the needle (40-300)x0,1 mm, as blockcopolymer butadiene and styrene - definiltely TPR brand DST-R-01 on THE other 38.40327-98 (DST), as thermal fraction >230°With the resin semi-coking coal-thermal fraction >230°With the resin semi-coking liptobiolith coal on THE 2221-004-02067942-2002 representing a liquid with a viscosity of 50-120 mm2/s at 50°C, hexamethylenetetramine technical the lei is due to the fact well-known fact, what low-temperature tar solid fossil fuels (derived in the process of semi-coking) is better aligned with the bitumen than high temperature (obtained in the process of coking) [Lisicina A. I. Surface-active additives to improve water-stability of road surfaces using bitumen and tar, - M: Autotransmit, 1959, 232 S.], and, in addition, the first contain surfactant acid and a basic compound that increases the adhesion ability of the binder.

Choice as an additive thermal fraction >230°C resin semi-coking coals (consisting of aromatic compounds) is also due to the desire to replace industrial oil (consisting mainly of aliphatic compounds) a substance consisting of aromatic compounds, since it is known that aromatic compounds which are copolymers of butadiene and styrene, partially soluble in aliphatic compounds, as well as the fact that this faction is missing and low-boiling volatile phenols (oxybenzone, Cresols), so, despite the high operating temperatures get good reproducible results, and no contamination of the atmosphere.

The choice of the second additive is a genius coals and blockcopolymers of butadiene and styrene, forms oligomers with active terminal functional groups (hydroxyl, carboxyl, carbonyl and amine), responsible for the adhesive to mineral materials of any nature. In this sense, the hexamethylenetetramine is structuring additive to the mixture containing copolymers of butadiene and styrene and thermal fractions >230°With the resin semi-coking coals.

The quantity of bitumen is determined by the number entered in the mixture of the other components.

The table shows the dependence of the adhesion and other physical and mechanical properties of polymer-bitumen binder depending on its composition.

Experimental study, results of which are presented in examples 1-3 of the table show that the optimal number entered into the composition of blockcopolymer butadiene and styrene equal to the values specified in the claims. When this adhesive binder and to the acidic and basic materials pavement remains the best and is equal to 5 points.

When the content of polymer-bitumen binder DST less than 2% of the polymer is not generated spatial grid, providing increased physical-mechanical Pokie 6% of the economically unprofitable.

Examples 5-7 illustrate the dependence of the adhesion to the binder on the number entered product of semi-coking coals. The optimal amount corresponds to 10-40 wt.%. The content of the product of semi-coking coal of less than 10% does not enable reasonably well dispersing the minimum number of DST and to create the necessary plasticizing effect; adding his more than 40% was not feasible due to creating too viscoplasticity effect.

As examples 7-9 table, the optimal number exame-trenchermen is in the range of 0.1-2.0 (over 100%). The amount of hexamethylenetetramine regulate technological indicator binder (penetration), adhesiveness and to a certain extent, the softening temperature and fragility. Therefore, the number of hexamethylenetetramine in the composition is determined by the number and ratio of the other three components of the binder and the specified value of the technological parameter of penetration. So, basically, pick this amount of plasticizer - product of semi-coking coal to the amount of hexamethylenetetramine was specified in the formula concentration range.

Shown in OI ability to acidic mineral materials in comparison with the prototype; this significant improvement in adhesion occurs when saving the main physico-mechanical properties of polymer-bitumen binder.

Use as additives to the bitumen - block copolymers of butadiene and styrene thermal fraction >230°With the resin semi-coking coals and hexamethylenetetramine provided education in this multicomponent system oligomers with multiple integral functional hydroxyl, carboxyl, carbonyl groups. Specific adsorption of such oligomers on the surface of mineral materials of any nature to the surface (and the basic and acidic) is characterized by high adsorption energy of interaction, which is supplemented by a further and quite a large energy dispersion interactions defined by the relatively large size of the molecules of the resulting oligomers. In the result of molecular interactions in the resulting multi-component system is obtained vzaimosoglasovannyie structure having high adhesiveness to mineral materials along with good physical and mechanical properties.

In addition, the introduction of the inventive polymer-bitumen binder about the Kie and technological characteristics of the binder and to obtain a composition with predetermined indicators. This is important in the production environment and to adjust the composition upon receipt of binder and to adjust the composition after storage. The latter is especially true in the case of polymer-bitumen binder, because he is most pronounced change the properties (especially the technological characteristics of penetration) during storage due to the aging of polymers.

The main feature of the first invention (substance) is getting not previously known polymer-bitumen binder having good adhesion to the basic and acidic mineral components polymerisation mixtures and compositions for the surface treatment, which is obtained in the following ratio, wt.%:

Bitumen 54,0-88,0

The copolymers of butadiene and styrene 2,0-6,0

The product of semi-coking coals 10,0-40,0

Hexamethylenetetramine 0,1-2,0 In Excess Of 100%

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

- use as additional components to the asphalt and copolymer of butadiene and styrene instead of industrial thermal oil fractions &aemula polymer-bitumen binder to mineral materials of different nature;

- establishing the sequence of technological operations under certain parameters for obtaining polymer-bitumen binder.

These distinctive features not found by the applicants in the available sources of information.

Distinguishing features of the claimed invention in conjunction with the known result in the emergence of a new quality polymer-bitumen binder to improve its adhesion to the mineral components of the road surface of the basic and acidic character.

The results of these studies show the possibility of implementing the proposed technical solutions, leading to the polymer-bitumen binder necessary technology brands with stable values of adhesion to mineral materials basic and acidic nature and high physical and mechanical properties.

The results are given in the table.

1. Polymer-asphalt binder containing bitumen and copolymers of butadiene and styrene, characterized in that it comprises the product of semi-coking coals and hexamethylenetetramine in the following ratio, wt.%:

Bitumen 54,0 - 88,0

<

Hexamethylenetetramine 0,1 - 2,0 in excess of 100%

2. Polymer-asphalt binder 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 a polymer-bitumen binder, characterized in that the mixture of the product of semi-coking coals with blockcopolymers of butadiene and styrene at a temperature of 80°C, maintain it for two hours and heated under stirring to a temperature of 120°C, then the resulting mixture was fed bitumen heated to a temperature of 110°C and continuing the stirring, enter hexamethylenetetramine at a temperature of 110°C, after which the temperature of the mixture was raised to 160°C and stirred at this temperature for 0.5 hours

4. The method according to p. 3, characterized in that it receives the polymer-asphalt binder in the following ratio, wt.%:

Bitumen 54,0 - 88,0

The Copolymers

butadiene and styrene 2,0 - 6,0

The product of semi-coking coals 10,0 - 40,0

Hexamethylenetetramine 0,1 - 2,0 in excess of 100%



 

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