What is the difference between anionic and cationic emulsions?

An emulsion can be Anionic, Cationic, and Non-Ionic. An Anionic emulsion has a negative charge, a Cationic emulsion has a positive charge, and a Non-ionic emulsion has no charge.

What is cationic asphalt for?

Application of Cationic Asphalt Cationic Bitumen Emulsion has been recommended to use in several applications of Road Work like Tack Coat, Prime Coat, Surface Dressing work, 20 mm Premix Carpet, Sealing of cracks with fog seal, slurry seal, micro-surfacing, etc.

What is cationic asphalt emulsion?

CATIONIC ASPHALT EMULSIONS, WHICH ARE POSITIVELY CHARGED, ARE USED WITH ELECTRONEGATIVE AGGREGATES, WHEREAS ANIONIC EMULSIONS ARE USED WITH ELECTROPOSITIVE AGGREGATES. THE CURRENT STATUS OF CATIONIC AND ANIONIC ASPHALT EMULSIONS IS DESCRIBED, WITH SOME INDICATIONS AS TO PROBABLE FUTURE USES FOR EACH TYPE.

What is cationic bitumen?

A stable dispersion of bitumen in water in continuous phase. The bitumen globules are positively charged due to the NH3 + group cover which is formed around bitumen droplets and provide stability for emulsion by electrostatic repulsion.

What is anionic bitumen emulsion?

Anionic Bitumen emulsion in which the droplets of bitumen carry a negative charge. The anionic bitumen emulsion is derived from the migration of particles of bitumen under an electric field. The droplets migrate toward the anode (positive electrode), and hence the emulsion is called anionic.

What is anionic emulsifier?

What is anionic emulsifying agent?

Anionic emulsifying wax functions as an emulsifying agent in topical pharmaceutical products. The typical usage levels are 5-15%. It is recommended that the wax is added to lipid or paraffin phases of the emulsion to enable bases to facilitate smooth addition and manufacture of stable emulsions.

What do you mean by 80 100 grade bitumen?

Bitumen of grade 80/100 means that in the bitumen penetration test, when the needle sinks 8 to 10 mm in the bitumen, we find out that the penetration value is between 8 and 10 mm and this type of bitumen is 80/100 bitumen.

What is a anion and cation?

Cations are positively-charged ions (atoms or groups of atoms that have more protons than electrons due to having lost one or more electrons). Anions are negatively-charged ions (meaning they have more electrons than protons due to having gained one or more electrons).

What is non ionic emulsifier?

Nonionic surfactants represent a major component material for applications ranging from personal care to a wide range of industrial uses. Structurally, nonionic surfactants combine uncharged hydrophilic and hydrophobic group that make them effective in wetting and spreading and as emulsifiers and foaming agents.

What is a cationic surface?

What are cationic surfactants? Surfactants are substances that reduce the surface tension of a liquid or the interfacial tension of two phases. Cationic surfactants are surfactants that have a positively charged functional group. Like any surfactant, cationic surfactants are composed of a polar and a non-polar part.

What is anionic displacement?

Anion replacement Here one anion replaces another: (Element A has replaced B in the compound CB to form a new compound CA and the free element B.) Some examples are: Again, the less reactive halogen cannot replace the more reactive halogen: no reaction.

What are the anionic and cationic classes of Asphalt emulsions?

The anionic and cationic classes refer to the electrical charges surrounding the asphalt particles. The absence of the letter “C” denotes anionic emulsions.

What is the difference between cationic and anionic emulsion?

The breaking of anionic emulsions is dependent on the evaporation of water from bitumen emulsion. As such, it poses difficulty in wet weather condition. However, for cationic emulsions, instead of relying on the evaporation of water the breaking is achieved by chemical coagulation.

Is the chemical charge of Asphalt emulsions positive or negative?

In the case of anionic emulsions, the chemical charge is negative. The chemical type and quantity of surface-active agent used in the manufacturing process govern the process in which the resulting asphalt emulsion can be used.

Why is anionic surfactant used in road construction?

Most of the fillers used in road construction have a limited amount of positively charged particles, which can attract the negatively charged particles of the anionic emulsion. Therefore, it is more difficult to create a uniform structure and ensure a high degree of adhesion with an anionic surfactant.