Emulsions of powdered products have been known for quite a long time. The simplest example is dry milk. In case of bitumen emulsions, to make dry substance, it is necessary to have a special capsular product (polymer), which allows the material to encapsulate and dry.
The beginning of research into the production of “dry” emulsions is due to the promising applications in road construction and repair in remote areas. After dilution of the product with water to the proper concentration, it can be used for the intended purpose.
By now we have already accumulated the necessary knowledge on “dry” emulsions. In particular, we can assert that this construction material can be made from emulsion produced by usual methods. But there is one key difference. Water phase must be injected with a polymer which should be similar to the surfactant and at the same time, compatible with the emulsifier. Then the product is dried to obtain solid particles, i.e. capsules.
During research the biggest problem was the search for a method to dilute the material with surfactant. The scientific work allowed to synthesize a hydrophilic polymer of polyacrylic resin type. This made it possible to produce “dry” emulsion by drying. During this drying process it is critically important to observe the key principle: the minimum ratio between granule size and initial size of droplets should be around 10.
One of the key advantages of “dry” emulsions is the opportunity to mix several kinds of materials which cannot be combined in their usual state.
Summing up all the above, let us generate the principle of “dry” emulsion production. First, direct bitumen emulsion is produced by standard methods. For GlobeCore’s UVB-1 units, offered in production capacity range from 1 to 8 m3/h, can be successfully used. Then the regular bitumen emulsion is mixed with a polymer and the resulting material is dried, for example by spraying. Powder is collected and can be stored up until the moment of application. With water and a dispensing unit, this powder can be restored to the initial emulsion state at any time.