A method of manufacturing a composition of bituminous material

 

(57) Abstract:

The invention relates to compositions of macromolecular compounds, namely, bituminous materials, and can be used, for example, in the manufacture of an expansion joint for road bridges. The objective of the invention was to improve performance of bituminous materials, increasing their durability. The technical result of the development of this method is to reduce the temperature of brittleness and a simultaneous increase in heat resistance of bitumen by modifying their structure additives polymers. To achieve a technical result, a method for manufacturing the composition of bituminous material, mainly based on petroleum bitumen, with the addition of structuring and plasticizer, so that the first in the bitumen is heated to 150 - 200°C, introduce a plasticizing component, mainly petroleum resin, and then structuring component, predominantly butadiene-styrene rubber. The components of the composition used in the following ratio, wt.h: bitumen 50 - 80; structural component 10 to 25; a plasticizing component 8 - 20. This plasticizing tion petroleum resin is injected in the form of granules, and butadiene-styrene rubber is injected in the form of granules or powder in portions in 2-3 doses, mainly in equal parts; use of oxidized or compounded bitumen. 4 C.p. f-crystals, 2 tab.

The present invention relates to a method of making compositions of macromolecular compounds, namely, bituminous materials, and can be used, for example, in the manufacture of an expansion joint for road bridges.

In the practice of sealing gaps span structures, such as joints of the closed type, widely used songs (mastic) on the basis of bitumen.

Known methods of manufacturing compositions UK firms Thormaxk Ltd (European patent N 0000642, the United Kingdom patent N 2001379) that use oil bitumen. This composition is known under the name ThormaJoint (1).

The closest analogue in relation to the claimed solution is a method of manufacturing an improved composition in Germany Lafrentz (German patent N 3720643, 1990, European patent N 0296377 B1, 1992 ) based on bitumen, mainly on petroleum bitumen, with the addition of structuring and plasticizer (2,3).

Task when creating offers the x durability.

The technical result of the development of this method of manufacture of the composition is reduced brittle transition temperature and a simultaneous increase in heat resistance of bitumen by modifying their structure additives polymers.

To achieve a technical result, a method for manufacturing the composition of bituminous material, mainly based on petroleum bitumen, with the addition of structuring and plasticizer, wherein the first bitumen heated to a temperature of 150-200oC enter a plasticizing component, mainly petroleum resin, and then structuring component, predominantly butadiene-styrene rubber. The method differs in that the used components in the following ratio, wt. including:

Bitumen - 50-80

Structural component 10 - 25

Plasticizing component - 8 - 20

The method differs in that the plasticizing component is dissolved in the bitumen within 5-10 min, and structuring component for 30 minutes to 2.5 hours Method differs in that the petroleum resin is injected in the form of granules. The method differs in that the butadiene-styrene rubber is injected in the form of granules or powder. The way otlichie differs using oxidized or compounded bitumen.

It is possible to introduce additional structural component - vulcanizing system based on sulfur-containing group.

The electron-microscopic and optical methods research showed that when injected into the bitumen small, 1-2%, additives polymers latter is able to be dissolved in a low molecular weight part of the bitumen oils. When large percentages of additives, the polymer is distributed in the bitumen in the form of separate, unrelated particles. The effect of their actions are similar to the effects of filler. When 5-10% of the additive particles increase in size, obviously, due to the aggregation approach among themselves and with 10-15% concentration to form a net structure. Thus, the combination of bitumen and polymer is a composite material in which the matrix plays the role of the bitumen, and the dispersed phase is a polymer. The composition behaves as a single entity, where the communication of heterogeneous particles can be represented as mechanical components together by surface forces. In its properties composition exceeds the average or aggregate properties of the individual components, so there is energicznie. The hardening is due to the fact that the fine dispersed particles hinder the movement of dislocations in the matrix. The degree of hardening is proportional to the resistance provided by the particle motion of dislocations. This effect was observed when the content of the dispersed phase at a rate of 2-4% of the volume. When the content of 3-5% of the polymer decreased brittle transition temperature (Fraas) without increasing deformation ability. Obviously, the lower temperature brittleness occurs at the expense of increasing strength. At higher concentrations of polymer in the bitumen composition can be considered as fibrous or layered. Matrix (bitumen) turns into the environment, transmitting the load to the fibers, and in case of their failure, it contributes to the load redistribution. Such compositions are characterized by high strength, elasticity, resistance to fatigue failure due to relaxation of strain, which is particularly useful for ensuring the operational reliability of bridge structures. On the boundary surface of the bitumen - polymer may result in partial dissolution of the polymer matrix due to segmental solubility. The strengthening of the composition due to the presence of the special properties of the transition layer, in quotaroot relaxation processes.

Bituminous part of the song (mastic) presents road bitumen grade bn 60/90 (GOST 22245-90). Baseline characteristics of bitumen are presented in table 1.

Example 1.

The bitumen is heated to a temperature of 170oC enter a petroleum resin as a plasticizing component, and then the butadiene-styrene rubber as a structural component, in this case, applying the components in the following ratio parts (bitumen, structuring, plasticizing components): 75, 10, 8. Petroleum resin is dissolved in the bitumen within 7 min, styrene-butadiene rubber is within 1 h, while the components listed above are administered in the form of granules, and butadiene-styrene rubber is injected portions in two equal parts. Use of oxidized bitumen.

Example 2.

The bitumen is heated to a temperature of 180oC enter a petroleum resin as a plasticizing component, and then the butadiene-styrene rubber as a structural component, in this case, applying the components in the following ratio parts (bitumen, structuring, plasticizing components): 78, 12, 10. Petroleum resin is dissolved in the bitumen for 8 min, butadiene-styrene fumes certain portions in two equal parts. Use of oxidized bitumen.

Example 3.

The bitumen is heated to a temperature of 200oC enter a petroleum resin as a plasticizing component, and then the butadiene-styrene rubber as a structural component, in this case, applying the components in the following ratio parts (bitumen, structuring, plasticizing components): 80, 15, 12. Petroleum resin is dissolved in the bitumen within 9 min, styrene-butadiene rubber is within 2 h, while the components listed above are administered in the form of granules and powder, respectively, and butadiene-styrene rubber is injected in portions three times in equal parts. Use of oxidized bitumen.

Thus, examples of implementation of the method of manufacture of the composition: the ratio of the components of the bitumen, structuring, plasticizers, wt. o'clock on the above examples, respectively 1) 75, 10, 8; 2) 78, 12, 10; 3) 80, 15, 12. Characteristics of the composition (examples 1, 2 ) are summarized in table 2, which also gives comparisons with known analog - composition of the firm Lafrentz (Germany).

Table 2 shows that the performance characteristics of the composition obtained suggested sosisochnye information

1. European patent N 0000642, 1981

2. German patent N 3720643, 1990

3. European patent N 0296377 B1, 1992

1. A method of manufacturing a composition of bituminous material based on petroleum bitumen with the addition of structuring component - butadiene-styrene rubber and a plasticizer component petroleum resin is injected into the heated bitumen first petroleum resin, and then the butadiene-styrene rubber, characterized in that the heating of the bitumen carry up to 150 - 200oC, the components of the composition used in the following ratio, wt.h.:

Bitumen - 50 - 80

Butadiene-styrene rubber - 10 - 25

Petroleum resin - 8 - 20

when the butadiene-styrene rubber is injected portions in 2 - 3 divided doses equal parts.

2. The method according to p. 1, characterized in that the plasticizing component is dissolved in the bitumen within 5 to 10 minutes, and structuring component for 30 min to 2.5 h

3. The method according to PP. 1 and 2, wherein the petroleum resin is injected in the form of granules.

4. The method according to PP.1 to 3, characterized in that the butadiene-styrene rubber is injected in the form of granules or powder.

5. The method according to PP.1 to 3, characterized in

 

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FIELD: chemical and petrochemical industries.

SUBSTANCE: the invention is pertaining to the field of chemical and petrochemical industries, in particular, to a polymeric composition and a method of its production. The method of production of a polymeric composition includes introduction of the maleinized polybutadiene containing from 10 up to 24 mass % of maleinic anhydride into a polymerizate, formed after termination of a synthesis of a block copolymer of A-B-A type and-or a block copolymer of (А-B)nX type, where "A" - is a vinylaromatic block, "B" - is a conjugated diene polymeric block, "X" -is a residue of a combining agent, "n" - is an integer equal from 2 up to 4, at a mass ratio of the indicated block of the copolymer and maleinized polybutadiene making 100 : (10-20). After that the target polymeric composition is separated from the reaction mass and dry up to the contents of the volatile impurities is no more than 0.2 mass %. The technical effect is development of a simplified method of production of a polymeric composition, which has an increased resistance against a multiple bending and an increased adhesion.

EFFECT: the invention ensures a simplified method of production of a polymeric composition with increased resistance against a multiple bending and an increased adhesion.

4 cl, 6 ex

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