Bitumen-polymer composition and a method for manufacture thereof

FIELD: manufacture of building materials.

SUBSTANCE: bitumen-polymer composition, which can be used in road building to create asphalt-concrete pavements, aerodrome and bridge surfaces, is constituted by divinylstyrene thermoplastic elastomer, 1.0-5.0%, plasticizer, 1.0-20.0%, antioxidant, 0.05-5.0%, and bitumen, the rest. Manufacturing method comprises component mixing stages and conditions of stages.

EFFECT: stabilized physicochemical performance characteristics and shortened manufacture time.

3 cl, 2 tbl, 4 ex

 

The group of inventions relates to the field of composite building materials, namely, a process for the production and the composition of the bitumen-polymer binders that can be used in road construction during the installation of asphalt pavements for roads, airfields and bridges, as the bitumen-polymer compositions for sealing joints and cracks in concrete and asphalt concrete pavement, as well as in the construction of industrial and civil structures.

One of the main binding materials in the construction of objects such as airfields, bridges, and the road is bitumen.

To increase the lifetime of the containing bitumen compositions, as well as improve such characteristics as flexibility at low temperatures, resistance to deformation, for example, Coleoptera on asphalt concrete pavement, make the modification of bitumen with polymers, in particular, Thermoelastoplastic rubbers. In ongoing research on the introduction of the bitumen additives (quality and quantity), and defining the modes and sequences of their introduction.

Known bitumen-polymer composition is a binder for pavement - which is obtained by introducing into the bitumen at 80-200°and With continuous stirring divinylacetylene block copolymers relating the polymers of the class of thermoplastic elastomers, type DST (definiltely TPR), produced in Russia, or SBS (styrene-butadiene-styrene), are produced abroad. Divinylacetylene the copolymers is administered in an amount of 0.1-10% by weight of bitumen in the form of 5-25%solution in light solvents /SU inventor's certificate No. 272881, C 08 L 95/00, 1968/.

The disadvantage of this composition is the use in the production of light solvents, which increases the hazard process. In addition, in the process of applying the bitumen-polymer compositions with high (>140° (C) the temperature light solvents evaporate, which leads to unpredictable changes in the properties of coatings.

The closest in technical essence to the proposed group of inventions is the asphalt binder for pavement and method of its production, including the introduction under stirring bitumen of blockcopolymer alkadiene and styrene, in this case, before the introduction of the bitumen block copolymers in an amount of 0.1-22.3 wt.% mixed at 80-160°from 1.9-33.3 wt.% plasticizer (oil industrial), then the mixture is injected at 100-160°in the bitumen /RU patent No. 2038360, C 08 L 95/00, 1995/.

A disadvantage of the known method of obtaining a bitumen-polymer composition is the increase in thermo-oxidative degradation of blockcopolymer when mixing the starting components, which results in an increased is to increase the flow of polymer to achieve high performance characteristics of the finished product, it also increases the duration of the production cycle.

The main component of the proposed bitumen-polymer composition is a viscous road bitumen with different quality characteristics even within a particular brand of bitumen, which complicates the selection of qualitative and quantitative characteristics of the other components of the composition and sequence and their mode of mixing.

The present invention is to enhance the functionality of the bitumen-polymer compositions and the receipt of the products with sustainable operational physico-mechanical characteristics.

The technical result is to reduce the time of production of the composition with high performance properties.

The problem is solved and the technical result is achieved due to the fact that bitumen-polymer composition comprising bitumen, definiltely thermoplastic elastomer and the plasticizer further comprises an antioxidant in the following ratio, wt.%:

definiltely TPR1,0-5,0
the plasticizer1,0-20,0
antioxidant0,05-5,0
bitumento 100

PR is as antioxidant is preferable to use polyethylsiloxane liquid.

The technical result is also achieved due to the fact that the method of obtaining a bitumen-polymer composition, comprising mixing components of the bitumen, divinylacetylene thermoplastic elastomer and plasticizer, the original quantity of bitumen is divided into two parts, the first part of 10-60% of the initial amount of pre-heated bitumen to a temperature not lower than 90°C, mixed with the plasticizer using a high-speed stirrer for 10-30 min, the mixture is reheated to 110°and enter definiltely thermoplastic elastomer, and an antioxidant, followed by processing equipment with high shear stress while heating to 140-165°received bitumen-polymer mixture is injected into the second part of 40-90% of the original quantity of bitumen and dispersed to obtain a homogeneous mass, then select the test for homogeneity.

A method of obtaining a bitumen-polymer composition is as follows.

For the preparation of bitumen-polymer compositions can be used:

as bitumen of various grades of bitumen, such as bitumen road viscous grades BND 60/90; BND 40/60; BND 90/130 - GOST 22245-90;

as divinylacetylene thermoplastic elastomer - polymer linear structure - DST-30-01 on THE 38.103267-80 or branched structures - DST-R-01 on THE other 38.40327-98, and emery imported type SBS (SBS) with a ratio of styrene/butadiene 30/70 and an average molecular weight MW 230000 (see patent 2103290) etc.;

as the plasticizer - industrial grade oil I-20A, AND 30A, AND 40A according to GOST 20799-88 or vacuum gas oils, waxy TU 38.401-58-62-93;

as antioxidant polyethylsiloxane liquid PES-3 PES-5 according to GOST 13004-77 "Liquid silicone PES -1, 2, 3, 4, 5" or Agidol-1 technical (trade name ionol) TU 38.5901237 with am.1, 2.

The original quantity of bitumen is divided into two parts and placed in two reactors: 10-60% of the bitumen is placed in the first reactor, and the remainder in the second. In the first reactor with a heating jacket and a high-speed stirrer bitumen heated to a temperature of not lower than 90°With that determined by the characteristics of the pumping bitumen pumps, and type plasticizer (industrial oil or vacuum gas oil) when the rotation speed of the stirrer 150-300 rpm for 10-30 minutes, after which, the mixture is reheated to 110°With, give it definiltely thermoplastic elastomer, and an antioxidant, heated to 140-165°and is pumped into the second reactor, containing the remainder of the original bitumen and equipped with a stirrer, by passing through equipment with high shear stress, for example, a colloid mill. The introduction of the antioxidant at the same time with divinylacetylene thermoplastic elastomer can improve the process of stabilization of the bitumen-polymer is oppozitsii, by reducing thermal oxidative degradation of bitumen and blockcopolymer. Preferably as an antioxidant to use polyethylsiloxane (PES), as it is environmentally safe with a preheated 140-165°With bitumen-polymer composition or hot asphalt mixture it does not emit dangerous for human health products. In the second reactor, the mixture was dispersed by stirring to obtain a homogeneous mass with the help of a mixer and passing through the equipment with high shear stress, and then produce a selection of sample homogeneity. If the test for homogeneity is passed, then select the sample to determine the quality of the obtained product penetration, ductility and elasticity, and temperature softening and fragility. Received bitumen-polymer composition is transported to the consumer or make adjustments to the composition of its original components and recycling of bitumen-polymer compositions for equipment with high shear stress or directly to the mixing with the second part of the initial quantity of bitumen.

The scatter in the properties of bituminous materials even within the same brand bitumen dictates the need to conduct output control to determine the characteristics of the finished product for repair recipe up until all of the indicators will not be in order to comply with the standards of GOST.

The authors do not know the composition and method of reception of bitumen-polymer compositions, similar to those suggested, which allows to make a conclusion on the conformity of the proposed solutions to the criterion "novelty".

Bitumen-polymer binder are experiencing in accordance with GOST R 52056-2003.

Example 1. In a reactor with a volume of 10 cubic meters load of 5.6 tonnes of bitumen BND 90/130 with a temperature of 100°that is 20% of the calculated quantity of bitumen. The remaining bitumen in the amount of 22.4 tons loaded in parallel into the reactor with a capacity of 40 cubic meters per reactor volume of 10 cubic meters when the heating and agitator load the plasticizer in the amount of 2.1 tons and the mixture is reheated to 110°With, then download definiltely thermoplastic elastomer in the amount of 1.05 t and antioxidant PES-5 in the amount of 140 kg and stirred for 15 minutes with the mixer rotation speed of 200 rpm for the distribution of polymer in the reactor volume. All processes are temperature-controlled, preventing its increase above 165°C. Next, the contents of the reactor with a capacity of 10 cubic meters (bitumen-polymer mixture) through the equipment with high shear stress (colloid mill) overload in the reactor with a capacity of 40 cubic meters, where is dispersed in the bitumen by mixing with a stirrer speed of 50 rpm, and by passing the contents of the reactor recycle "himself" through the colloid mill is at a temperature not exceeding 165° With not less than 140°C for 40 minutes and then take the test for homogeneity.

The total time of mixing components of the composition until smooth (for batch release of about 30 tons) 55 min to produce a uniform batch of the same amount in terms of the prototype on the reproduced data authors need about 3 hours.

Examples 2, 3 and 4 are reproduced in the conditions of Example 1, but differ in the number of components and raw materials. Formulation of polymer-bitumen compositions shown in Table 1.

Introduction in the process of obtaining a bitumen-polymer composition of the antioxidant at the same time with divinylacetylene thermoplastic elastomer reduces thermal-oxidative degradation of bitumen and blockcopolymer that leads to the production of bitumen-polymer compositions with stable performance.

Performance characteristics of the finished product obtained according to examples 1-4, as well as in terms of the prototype reproduced by the authors to the data given in Table 2.

Thus, getting offered by way of bitumen-polymer compositions of the claimed composition allows to obtain high-quality uniform product that can be successfully used for production of asphalt concrete pavement of roads, airfields and bridges, bitumen emulsions, travelmail, and allows to reduce the consumption of expensive thermoplastic elastomer while reducing time obtaining a bitumen-polymer composition.

Elastic. when 0°,%
Table 1.
Formulation of polymer-bitumen compositions.
No.ComponentsThe quantity wt. %
1234
1.BND 60/9094,9570
2.BND 90/130to 89.593,3
3.And-30A4,020,0
4.Vacuum gas oils, waxy brand B6,7 1,0
5.DST R-013.355,0
6.DST 30-011,03,7
7.PES 50.450,05
8.PES 35,02,0
Table 2
Performance characteristics of the finished product
# exampleName characteristics
To warmupafter warming up*
T EXT., °T directions., °Elastic. when 0°,% T EXT., °C.T directions. °
Prototype60-224566-1735
1.60-287662-2776
2.54-246552-2465
3.87-398886-3886
4.74-328574-3185
*heating was carried out according to GOST 18180 "Bitumen oil. Method of determining weight changes after warming up".

1. Bitumen-polymer composition comprising bitumen, definiltely a thermoplastic elastomer and a plasticizer, characterized in that it further comprises an antioxidant in the following ratio of components, the AC.%:

definiltely TPR1,0-5,0
the plasticizer1,0-20,0
antioxidant0,05-5,0
bitumen100

2. Bitumen-polymer composition according to claim 1, characterized in that the antioxidant is used polyethylsiloxane liquid.

3. A method of obtaining a bitumen-polymer composition, comprising mixing components of the bitumen, divinylacetylene thermoplastic elastomer and a plasticizer, wherein the initial quantity of bitumen is divided into two parts, the first part of 10-60% of the initial amount of pre-heated bitumen to a temperature not lower than 90°mixed with the plasticizer using a high speed stirrer for 10-30 min, the mixture is reheated to 110°and enter definiltely thermoplastic elastomer, and an antioxidant, followed by processing equipment with high shear stress while heating to 140-165°received bitumen-polymer mixture is injected into the second part of 40-90% of the original quantity of bitumen and dispersed to obtain a homogeneous mass, then select the test for homogeneity.



 

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