SU639588A1 - Method of obtaining highly stable bitumen emulsions - Google Patents

Description

Example. Under constant stirring, stir up 440 kg of water in a mixer with 30 kg of clay with a cation exchange capacity of 13.6 mg eq / 100 g. To the mixture add 2 kg of boiling sulphate (ZnS04-7H20). The amount corresponds to approximately 45 mg SQV / 100 g of clay. In this case, the deposition of clay crystals with zinc takes place, which, when deposited, amounts to 7.5 mEq of Zn / 100 g of clay. The suspension is heated to 50-70 ° C and mixed with 5 kg of alkylphenyl polyglycol ether with an ethoxylation number of 7. The suspension with the help of a metering device is continuously supplied to a colloid mill, to which also 520 kg of pagret to 120-150 are continuously fed ° C bitumen with a softening point of 54 to 60 ° C, and extremely fine, high-quality bitumen-type oil-in-water emulsion occurs. The temperature during emulsification is constantly maintained at 50-70 ° C. Then the hot emulsion continuously passes the vessel with a turbine mixer, and with constant stirring, the emulsion is introduced from the bottom and through the inlet pipe using a dosing pump 3 kg of potassium hydroxide dissolved in 3 kg of water. At the same time, negative charges of the outer layer of clay crystals located around the emulsified particles of bitumen are recorded. At the same time, the emulsion particles acquire a polar charge and mutually repel each other.

The alkalized emulsion is withdrawn from above and fed to a storage vessel, which is equipped with a slowly rotating stirrer and a cooling device. In this case, the stabilization of the entire disperse system takes place and the emulsion achieves its final qualitative properties.

Received on the proposed method

has the following properties of emulsion

you.

Soderl aiie binder

7o

substances, pH value Degree of stability with

Maximum 1% cement: adjusted parts

Viscosity at 20 ° C, cn

80-200

Stability at snore- Min

5

del

PSI sedimentation

The average size of particles, mm3-5

F. About rmu l and inventions

Claims (2)

1. A method for producing highly stable bitumen emulsions by mixing liquefied bitumen with clay emulsifiers, characterized in that, in order to simplify the process and increase the stability of the suspension, clay with a cation-exchange protein with a capacity of 10 to 100 mg-eq per 100 g is treated with divalent salts of zinc, iron, calcium, copper, or trivalent aluminum to adjust the pH to 5.5 to 6.9 and surfactants, followed by heating the resulting suspension to temperature 50-90 ° C and mixing it with bitumen heated to a temperature of 100-160 ° C with a ratio of clay and bitumen from 1: 10 to 1: 25, adding potassium or sodium silk to an emulsion pH from 7 to 11 and cooling the resulting emulsion to temperatures from 30 to 15 ° C with unmixed. 2. The method according to claim 1, different by using alkylphenyl polyglycol ethers as surfactants.