The different mesh numbers of PVA should be selected according to the specific application needs, to ensure the best effect. The mesh number of PVA indicates its particle size, the larger the mesh number, the smaller the particle diameter.
For example, 120 purpose polyvinyl alcohol particle size is smaller, under the action of surfactants, can be better adsorbed and coated by liquid, the lubricity, and other properties are better than 80 purpose polyvinyl alcohol. , therefore, when it is necessary to use polyvinyl alcohol, should be selected according to the specific application needs of different mesh of polyvinyl alcohol.
In addition, the common mesh of polyvinyl alcohol includes 12 mesh, 20 mesh, 25 mesh, 80 mesh and 120 mesh, grinding into powder can improve the dissolution rate of polyvinyl alcohol, but not the finer the better, the powder will lump as long as it is soaked with water, especially when the dosage is large. On the contrary, it is not conducive to the dissolution of PVA.
When dissolving more than 80 mesh PVA powder, pay attention to the way of adding, need to stir quickly, add slowly, to prevent more powder together when encountering water. Dissolved larger particles of powder below 80 mesh PVA basically will not lump, but at room temperature dissolution is slower, you can stir or increase the dissolution temperature, thereby accelerating the dissolution of PVA.
Therefore, the appropriate mesh number should be selected according to the different requirements of the product and the situation of the reactor of the existing equipment.
ElephChem can provide a variety of PVA powder with different mesh sizes, welcome to consult:
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