Fully Combine The Processing Process To Determine The Concentration Of Superabsorbent

　　 Superabsorbent There are many kinds of products with different forms. There are also many classification methods, which are generally classified according to the raw materials used, hydrophilic method, cross-linking method and product form. According to the source of raw materials, it can be divided into the following three categories: modified starch, which includes starch grafted acrylonitrile hydrolysate, starch grafted acrylate, starch grafted acrylamide, starch carboxymethyl compound, etc; Modified cellulose, mainly including cellulose grafted acrylonitrile hydrolysate, cellulose grafted acrylate cellulose Carboxymethyl compound grafted with acrylamide and cellulose; Synthetic polymers mainly include cross-linked polyacrylate, cross-linked polyacrylamide, acrylate and vinyl acetate copolymer hydrolysate, polyvinyl alcohol and anhydride cross-linked copolymer, etc.

If you press Hydrophilization The methods can be classified into the polymerization of hydrophilic monomers, copolymerization of hydrophobic monomers and hydrophilic monomers, hydrolysis of cyano and aliphatic groups; According to the cross-linking method, it can be divided into cross-linking agent cross-linking, bulk cross-linking, radiation cross-linking and introducing hydrophobic groups or crystal structures into hydrophilic polymers; According to the product form, it can be divided into powder, fiber, sheet, film and foam.

There are only two types of water absorbents, anionic and non-ionic, among which anionic water absorbents have high water absorption times, but poor salt resistance; The non-ionic superabsorbent has fast water absorption speed, good salt resistance, but low water absorption capacity. Therefore, the super absorbent products produced by these two methods are not actually "high performance".

At the same time, the water absorption performance of super absorbent nonwovens is not only related to the selected process route and the proportion of main fibers, but also to the concentration of super absorbent. From the perspective of the performance of superabsorbent nonwovens, the higher the concentration of superabsorbent, the better. However, due to the limitations of the performance of superabsorbent itself and production process, the concentration of superabsorbent cannot be too high. Because too high concentration will cause the super absorbent to form jelly, which cannot be used in the production process, and will also increase the cost; If the concentration is too low, the expected purpose will not be achieved. At present, the concentration of superabsorbent used by domestic enterprises is mostly around 0.05%.

Researchers from Berlin University of Technology announced a new method - impregnation method. The so-called impregnation method is to make the super absorbent into a dispersion solution, and then apply it on the surface of the fabric by brushing or spraying, or immerse the fabric in this dispersion solution to fix the super absorbent in the gaps of the fabric. This method may become the latest and most authoritative solution for adding super absorbent.