Japanese SPG film

日本SPG膜Shirasu Porous Glass is a new type of inorganic membrane developed by SPG in 1981. SPG membranes have consistent and uniform small pore sizes, and the pore size can be easily changed. In the production process of SPG membranes, the first step is to mix volcanic ash, glass, and limeBoric acid is formed at 1350 ℃, and then heated to around 700 ℃ to produce phase change and separation: CaO · B2O3 and Al2O3 · SIO2, to produce glassy material with slight phase separation. Finally, it is treated in acid to remove soluble substances, and after manual processing, porous glass containing Al2O3 · SIO2 is finally formed; The material is processed into a certain thickness and shape, which is called SPG film. By changing the preparation conditions, SPG membrane tubes and membranes with different pore sizes can be obtained.

By stirring and mixing two immiscible liquids with an appropriate amount of surface active ingredients, an emulsion can be produced. However, the droplets of the emulsion are highly dispersed and can differ in diameter by several times or even tens of times.

Principle: The dispersed phase passes through the membrane hole of microporous membrane under the action of nitrogen pressure, and forms droplets on the membrane surface. Under the washing action of continuous phase flowing along the membrane surface, the droplets will peel off from the membrane surface after their diameter reaches a certain value, thus forming lotion. The size and distribution of lotion particles can be well controlled by using SPG membrane with uniform pore size. Due to the relatively uniform diameter of the micropores in the membrane, the droplets produced into the emulsion are also relatively uniform. As long as the composition of the water phase is adjusted and the stability of the droplets is maintained, highly monodisperse emulsion droplets can be obtained, and corresponding polymer particles can be obtained after polymerization.

Application: It is mainly used to prepare lotion, beads, microspheres, microcapsules, etc. with uniform size, and can prepare W/O, O/W, W/O/W, O/W/O type lotion. Realize the size uniformity of lotion; Controllable surface functionality of microspheres; Stability of porous microsphere structure; Preparation of homogeneous lotion; Control of pore channels in porous microspheres or sustained-release capsules, etc.

日本SPG膜specification