RU2696476C1 - Bitumen composition and a method for production thereof - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: group of inventions relates to the chemical industry, specifically to the production of bitumen compositions for a protective sealing coating used in road construction, as well as to compositions of bitumen compositions. Method of producing a bitumen composition, comprising steps of heating petroleum road bitumen to temperature of 130–145 °C, and dispersing it in a colloidal mill in an aqueous solution of a cationic emulsifier with pH = 2.0–2.4, heated to temperature of 57–61 °C, until emulsion with bitumen droplet sizes of 0.001–0.02 mm is achieved. Calcium chloride is added to the obtained emulsion as a stabilizer; the obtained composition is placed into a storage container with heating. Then, the obtained composition is mixed at 85–95 °C in a colloid mill separately with each new additive: with an aqueous solution of a silane adhesion additive based on organosilicon compounds, with rubber crumbs obtained from waste automotive tires, with shale clay and granite sand.

EFFECT: compositions according to the invention have strength similar to the main fabric, high adhesion even on dusty coatings and absence of shrinkage.

6 cl, 1 tbl

Description

The group of inventions relates to the chemical industry, namely the production of bitumen compositions for protective sealing coatings used in road construction and to the compositions themselves. The compositions obtained by the proposed method are used to repair cracks (depth and width up to 10 mm) and small potholes (depth up to 10 mm and an area of up to 10 square cm) in asphalt (asphalt) coatings to prevent water from entering them, and, as a result , preventing their further destruction in the winter.

The following solutions are known in the art.

A known method of preparing rubber-bitumen mastic, including heating bitumen to a temperature of 90 ÷ 120 ° C in a thermally insulated container, adding crumb rubber and polyethylene, while only rubber crumbs in an amount of 10 ÷ 20% of the mass are added to the insulated container and mix them, and in additional thermally insulated sealed container is filled with polyethylene in an amount of 1 ÷ 2% of the mass and poured with a mixture of bitumen with rubber crumb supplied by gravity, then the resulting mixture is heated additionally to a temperature of 130 ÷ 170 ° C and and a gear pump is carried out multiple recycling the mixture through an insulated container (RF Patent № 2525487, published on 08.20.2014).

The disadvantage of this method is that the mastic is intended only for repairing roofs, using thermal equipment, and does not allow to perform the tasks of extending the service of asphalt pavements, since reduces to 0 the grip of the coating necessary to ensure the safe movement of cars and pedestrians.

Known bitumen mastic, including bitumen, a block copolymer of butadiene with styrene and an adhesive additive, characterized in that, as an adhesive additive, the composition contains maleized low molecular weight polybutadiene with a content of bound maleated anhydride 12 ÷ 21 wt.% Having a dynamic viscosity at 25 ° C 10 ÷ 100 Pa · s (RF patent No. 2226203, published March 27, 2004).

A disadvantage of the known composition is that the mastic is intended for the manufacture of roofing, waterproofing materials, sealants and is not intended for use on rough layers of the road, because reduces to 0 the grip of the coating necessary to ensure the safe movement of cars and pedestrians.

Insulating bitumen-polymer mastic and a method for its production are also known (RF patent No. 2241897, published December 10, 2004). The method involves mixing bitumen, thermoplastic elastomer, plasticizer and filler, while mixing the mastic components as follows: first, prepare a mixture of road and insulating bitumen or building bitumen, then dehydrate this mixture by heating to a temperature of 160-170 ° C, and supply the mixture of bitumen to mixer and add to the last plasticizer, the resulting mixture is stirred at a temperature of 165 ÷ 175 ° C for 2.5 ÷ 3.5 hours until the plasticizer is completely dissolved, then add a filler, for example, rubber oic crumb, and the mixture is stirred 25 ÷ 35 minutes, whereafter stirring is continued and added petroleum resin modifier, an adhesion agent and a thermoplastic elastomer. Insulating bitumen-polymer mastic includes a mixture of bitumen, thermoplastic elastomer, plasticizer and filler, characterized in that as a bitumen a mixture of bitumen BND-60/90 and BNI-4 or BN-70/30 is used, divinyl styrene thermoplastic elastomer is used, and in the composition of the mastic additionally introduced a modifier, a petroleum polymer resin and an adhesive additive, while the mastic has the following composition of components, wt.%:

bitumen BND-60/90 8.5 ÷ 90, bitumen BNI-4 1 ÷ 20 or bitumen BN-70/30 1 ÷ 90,

divinyl styrene thermoplastic elastomer 1,5 ÷ 5,

plasticizer 1 ÷ 5,

filler 1 ÷ 8,

petroleum resin 2 ÷ 8,

adhesive additive 0.3 ÷ 1.5,

modifier 1 ÷ 6.

The disadvantage of the known composition and method of its production is that the mastic is intended for anticorrosive protective coatings of underground pipelines and does not allow to perform the tasks of extending the service of asphalt pavements, since reduces to 0 the grip of the coating necessary to ensure the safe movement of cars and pedestrians.

The technical problem solved by the claimed group of inventions is the need to create a plastic and stable composition for the possibility of repairing small cracks (up to 10 mm in depth and length) and preventing further destruction of the road surface.

The technical result of the patented solution is to obtain a composition having a strength similar to the main fabric, increasing adhesion, even on dusty coatings, lack of shrinkage. The coating, over time, acquires the color of the main canvas, which improves aesthetics.

The claimed technical result is achieved due to the production method of the bitumen composition and the composition obtained by the specified method.

A method for producing a bitumen composition, comprising the steps of heating road oil bitumen to a temperature of 130-145 ° C and dispersing it with a colloid mill in an aqueous solution of a cationic emulsifier with a pH of 2.0-2.4, heated to a temperature of 57 ÷ 61 ° C, to achieving an emulsion with droplet sizes of bitumen 0.001 ÷ 0.02 mm, where the cationic type emulsifier aqueous solution contains a block copolymer of butadiene and styrene (1.4%), 35% hydrochloric acid (0.17%) and process water - the rest ; stabilizer is added to the emulsion obtained (calcium chloride, 0.2%). The resulting compositions are collected in a storage tank with heating. Then, the resulting composition is mixed at a temperature of 85 ÷ 95 ° C in a colloid mill with an aqueous solution of a silane adhesive additive based on organosilicon compounds, the resulting composition is mixed in a colloid mill with rubber crumb, a fraction of 0.01 ÷ 0.5 mm, obtained from used car tires, the resulting composition mixed in a colloidal mill with shale clay, the resulting composition is fed into a colloidal mill and mixed in it with granite sand fraction 1.0 ÷ 3.0 mm, while the temperature of each composition is 85 ÷ 95⁰С, at the following ratio of components, wt.%:

road oil bitumen - 21.0 ÷ 29.0 emulsifier - 0.2 ÷ 0.3 hydrochloric acid (35%) - 0.1 ÷ 1.0 calcium chloride - 0.1 ÷ 0.2 adhesive additive - 0.8 ÷ 1.4 rubber crumb - 2.0 ÷ 6.5 shale clay - 2.2 ÷ 2.9 granite sand - 3.0 ÷ 39.5 water - rest

In the particular case of the invention, calcium chloride is used as a stabilizer.

In the particular case of carrying out the invention, a silane adhesive additive based on organosilicon compounds is used as an adhesive additive.

A bitumen composition containing road petroleum bitumen, a cationic emulsifier with pH = 2.0 ÷ 2.4 and including industrial water, a block copolymer of butadiene and styrene and 35% hydrochloric acid, while the size of the bitumen droplets in the emulsion is 0.001 ÷ 0.02 mm, an aqueous solution of an adhesive additive, rubber crumbs with a particle size of 0.01 ÷ 0.5 mm, obtained from used car tires, shale clay, granite sand with a particle size of 1.0-3.0 mm, pigment the black.

In the particular case of the invention, the bitumen composition is used as a protective sealing coating for asphalt and has the following composition of components, wt.%

- bitumen road BND 90 / 130– 28.6%

- emulsifier - 0.25%

- hydrochloric acid (35%) - 0.13%

- calcium chloride - 0.18%

- adhesive additive - 1.36%

- rubber crumb - 2.2%

- shale clay - 2.88

- granite sand 3.4%

- water - 61%

In the particular case of the invention, the bitumen composition is used as a mastic to fill cracks in the asphalt and has the following composition of components, wt.%

- bitumen road BND 60/90 - 21.2%

- emulsifier - 0.18%

- hydrochloric acid (35%) - 0.9%

- calcium chloride - 0.11%

- adhesive additive - 0.85%

- rubber crumb - 6.46%

- shale clay - 2.2

- granite sand 39.2%

- water - 29%

Bitumen road grade BND 90/130 or BND 60/90, heated to a temperature of 130-145 ° C (depending on the penetration of bitumen), is dispersed using a colloid mill in an aqueous solution of a cationic emulsifier, heated to a temperature of 57-61 ° C, including water technical, block copolymer of butadiene and styrene (SBS) and hydrochloric (hydrochloric) acid HCL (35%).

the pH of the aqueous emulsifier solution is 2.0 to 2.4.

BND means “oil road bitumen”, fraction numbers 60/90, 90/130, etc. indicate acceptable for the brand limits for the penetration depth of a standard needle at 25 ° C, which indirectly characterize the viscosity of bitumen.

The size of the bitumen droplets in the emulsion after passing through the colloid mill should be in the range from 0.001 to 0.02 mm.

To increase the stability and prevent the swelling of drops of bitumen caused by reverse osmosis, calcium chloride can be added to the emulsion as a stabilizer.

In the obtained cationic emulsion, positively charged ions are oriented on the surface of bitumen droplets. Negatively charged chloride ions are attracted to the surface by positive charges, and an electric double layer is formed in the emulsion. This has a strong effect on the stability and viscosity of the emulsion.

The temperature of the emulsion obtained should not reach 100 ° C during production and should be maintained in the range of 85-95 ° C. In order to avoid local overheating, the temperature difference between the bitumen and the emulsifier solution should be kept as low as possible. However, the bitumen must be hot enough for pumping or gravity flow.

The resulting composition is re-fed into a colloidal mill and mixed in it with an aqueous solution of an adhesive additive STARDOPE-580 (Silane adhesive additive based on organosilicon compounds).

Next, each new composition obtained is also fed to a colloidal mill, to which rubber crumb fraction 0.01-0.5, obtained from used automobile tires, shale clay, granite sand fraction 1.0-3.0 mm, black pigment Baiferrox 330 are successively added. Mixing the resulting composition occurs as the components pass through the colloidal mill, and in time depends on the power of the mill and the number of components to be mixed.

At this stage, mixing is performed without additional heating.

The resulting compositions are collected in a storage tank and from there re-fed to a colloidal mill. Thus, all the necessary components are added sequentially to the resulting composition.

The result is a thick black liquid mass, which is a protective sealing coating.

The resulting composition is poured into a metal or plastic container with a tight-fitting lid that limits the contact of the product with atmospheric air and sunlight.

Shelf life of the composition at an air temperature of at least + 5 ° C - 6 months.

The proposed method produces cold bituminous mastic "Mastic 05" as well as a protective sealing coating "Protection 02", which differ only in the percentage of components and the used brand of bitumen. An empirical selection of components makes repairs more efficient.
Table 1. Characteristics of the material obtained by the claimed method depending on the quantitative composition for cold bituminous mastic "Mastic 05" and a protective sealing coating "Protection 02".

Name of indicator Defense 02 Mastic 05 Heat resistance, ° С, not less 90 90 Conditional viscosity, mm 100-120 140-180 Elasticity at 25 ° С, not less 80 70 Flexibility on a bar with a diameter of 10 mm at a temperature of 15 ° C No cracks No cracks Tensile strength at break, MPa, not less 0.2 0.2 Fragility temperature, ° С, not higher -five -five

The upper protective sealing coating for asphalt has the following composition of components (code name “Protection 02”), wt.%

- bitumen grade BND 90/130 - 28.6%

- emulsifier - 0.25%

- hydrochloric acid (35%) - 0.13%

- calcium chloride - 0.18%

- adhesive additive - 1.36%

- rubber crumb - 2.2%

- shale clay - 2.88

- granite sand 3.4%

- water - 61%.

Cold bitumen mastic (code name “Mastic 05”) has the following composition of components, wt.%

- road bitumen grade BND 60/90 - 21.2%

- emulsifier - 0.18%

- hydrochloric acid (35%) - 0.9%

- calcium chloride - 0.11%

- adhesive additive - 0.85%

- rubber crumb - 6.46%

- shale clay - 2.2

- granite sand 39.2%

- water - 29%

After filling the cracks or bumps in “Mastic 05” asphalt, water evaporates from it, and at the place of the former fracture a solid, sufficiently elastic bitumen filling with mineral fillers is formed, which provides strong adhesion to the walls of the cracks or bumps and thereby sealing repaired fractures, protecting them from the water.

After repairing the damage with “Mastic 05”, the entire site is surface-sealed with the “Protection 02” protective sealing coating in order to give the entire site a beautiful appearance and additional asphalt sealing.

Thus, an empirical selection of components allows you to make repairs the most efficient. Characteristics of the compositions are shown in Table 1.

The proposed composition of the protective coating and its production method differs from similar ones in that:

a) it is used in a cold form, while the use of analogs requires special thermal equipment (tar sprayers, gas burners, etc.). Accordingly, specially trained specialists are not required;

b) unlike cold asphalt, it can be used to repair small cracks and potholes;

c) does not contain aggressive solvents with a strong odor and, as a result, does not pollute the environment, does not have an unpleasant odor, and does not require special respiratory protection. Does not burn.

Claims (9)

1. A method of manufacturing a bitumen composition, comprising the steps of heating road oil bitumen to a temperature of 130-145 ° C, dispersing it with a colloid mill in an aqueous solution of a cationic emulsifier with a pH of 2.0-2.4, heated to a temperature of 57- 61 ° C, to achieve an emulsion with a droplet size of bitumen of 0.001-0.02 mm, calcium stabilizer is added to the emulsion obtained, the resulting composition is placed in a storage tank with heating, then the resulting composition is mixed at a temperature of 85-95 ° C in a colloid mill with aqueous solution of forces an organosilicon adhesive additive, the resulting composition is mixed in a colloidal mill with rubber crumb (fraction 0.01-0.5 mm) obtained from used automotive tires, the resulting composition is mixed in a colloid mill with shale clay, the resulting composition is fed into a colloidal the mill and mixed in it with granite sand (fraction 1.0-3.0 mm), while the temperature of each obtained composition is 85-95 ° C, in the following ratio of components, wt.%: road oil bitumen 21.0-29.0 emulsifier 0.18-0.25 calcium chloride 0.1-0.2 adhesive additive 0.8-1.4 rubber crumb 2.0-6.5 shale clay 2.2-2.9 granite sand 3.0-39.5 water rest 2. The method according to claim 1, in which calcium chloride is used as a stabilizer. 3. The method according to claim 1, in which the resulting composition is mixed in a colloidal mill with black pigment. 4. Bitumen composition for use as a protective sealing coating, containing road petroleum bitumen 21.0-29.0 wt.%, Cationic type emulsifier 0.18-0.25 wt.% With pH = 2.0-2.4 and which includes industrial water, a block copolymer of butadiene and styrene and 35% hydrochloric acid, while the size of the bitumen droplets in the emulsion is 0.001-0.02 mm, an aqueous solution of a silane adhesive additive based on organosilicon compounds 0.8-1 , 4 wt.%, Rubber crumbs 2.0-6.5 wt.%, With a particle size of 0.01-0.5 mm, obtained from a used car tires, shale clay 2.2-2.9 wt.%, granite sand 3.0-39.5 wt.% with a particle size of 1.0-3.0 mm, calcium chloride 0.1-0.2 wt. .%, the rest is water. 5. The bitumen composition according to claim 4, wherein the bitumen composition is used as a protective sealing coating for asphalt and has the following composition of components, wt.%: bitumen road BND 90/130 28.6 emulsifier 0.25 calcium chloride 0.18 adhesive additive 1.36 rubber crumb 2.2 shale clay 2.88 granite sand 3.4 water rest 6. The bitumen composition according to claim 4, wherein the bitumen composition is used as a mastic to fill cracks in the asphalt and has the following composition of components, wt.%: bitumen road BND 60/90 21,2 emulsifier 0.18 calcium chloride 0.11 adhesive additive 0.85 rubber crumb 6.46 shale clay 2.2 granite sand 39.2 water rest