In the construction industry, the hydroxypropyl methylcellulose HPMC is often put into the neutral water. And the HPMC products are dissolve separately to determine the dissolution spee. When put into neutral water alone, separate and undispersed products are products without surface treatment. When the untreate hydroxypropyl methyl cellulose HPMC on the surface is dissolve alone. Its single particles dissolve quickly and become membranes rapidly, resulting in water unable to enter other particles. Resulting in agglomeration and agglomeration, which is currently call slow soluble products on the market.
Surface-treated hydroxypropyl methylcellulose:
In neutral water, single particles can disperse without clumping, but not immediately with product viscosity. After a certain time of immersion, the chemical structure of the surface treatment can damaged before the water can dissolve the HPMC particles. At this time, the product particles have been fully disperse and absorb enough water, so the product does not block or group after dissolution. The dispersion speed and slow dissolution speed depend on the depth of the surface treatment, with slight surface treatment.
Relatively slow dispersion speed and faster bonding speed; while the products with deep surface treatment have faster dispersion speed and slow bonding speed. If the series of products are to be rapidly dissolve quickly in this state. A small amount of alkaline material can dropped when dissolved alone. At present, the market is usually call instant products. The characteristics of surface-treated HPMC products are: in the aqueous solution. The particles can disperse with each other, in the alkaline state, can quickly dissolve, in the neutral and acidic state, slow dissolution.