super absorbent polymer(sap) used for mining

 

super absorbent polymer(sap) can be used for 1.Super absorbent polymerfor diapers2. Super absorbent polymerfor sanitary napkins

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The super absorbent resin is a polymer electrolyte containing hydrophilic group and crosslinked structure. Before water absorption, the polymer chains are close together and entangled, and cross linked to each other into a network structure, so as to achieve the fastening on the whole. When in contact with water, water molecules penetrate into the resin through capillary action and diffusion, and ionizing groups on the chain ionize in water. Stretching and swelling of polymer chains due to electrostatic repulsion between the same ions on the chain. Due to the requirement of electroneutrality, the counter ions cannot migrate to the outside of the resin, and the ion concentration difference between the solution inside and outside the resin forms the reverse osmotic pressure. Under the action of reverse osmotic pressure, water further enters the resin to form a hydrogel.

At the same time, the cross-network structure and hydrogen bond of the resin limit the infinite expansion of the gel.

When the water contains a small amount of salt, the reverse osmotic pressure decreases, and because of the shielding effect of the counter ion, the polymer chain shrinks, leading to a great decrease in the water absorption capacity of the resin. In general, the water absorption capacity of hyperabsorbent resin in 0.9% NaCl solution is only about 1/10 of that in deionized water.

Water absorption and water retention are two sides of the same problem. Under a certain temperature and pressure, a highly absorbent resin can spontaneously absorb water. Water enters the resin, reducing the enthalpy of the whole system until it reaches equilibrium. If water escapes from the resin, the free enthalpy will increase, which is not conducive to the stability of the system. Differential thermal analysis showed that 50% of the water absorbed by the hyperabsorbent resin remained enclosed in the gel network above 150°C. Therefore, water will not escape from the hyperabsorbent resin at room temperature even if pressure is applied, which is determined by the thermodynamic properties of the hyperabsorbent resin.

 

The main purpose

High water absorbent polymer is widely used and has a broad application prospect. At present, its main use is still sanitary products, accounting for about 70% of the total market. Due to the high water absorption capacity of sodium polyacrylate resin, and has excellent water retention performance, so as a soil water retention agent in agriculture, forestry, a wide range of applications. If a small amount OF superabsorbent SODIUM polyacrylate is added to the soil, the germination rate of some beans and the drought resistance of soybean seedlings can be increased, and the permeability of the soil can be enhanced. In addition, because of the hydrophilicity and excellent anti-fogging and anti-condensation properties of the high water absorption resin, it can be used as a new packaging material. The packaging film made of super absorbent polymer can effectively maintain the freshness of food. Adding a small amount of superabsorbent polymer in cosmetics can also increase the emulsion viscosity, which is an ideal thickening agent. It can be used as a dehydrating agent in industry by using the characteristics that the superabsorbent polymer only absorbs water and does not absorb oil or organic solvent.

 

In recent years, high water absorbent polymer has been widely used in the field of medicine because of its non-toxic, non-irritating, no side reaction and no blood coagulation. For example, it is used for external ointment with large water content and comfortable use. Produce medical bandages and cotton balls that can absorb bleeding and secretory fluid from surgery and trauma, and prevent suppuration; To make infection-resistant artificial skin that allows water and chemicals to pass through while microorganisms cannot.

With the development of science and technology, environmental protection has been paid more and more attention. If the super absorbent polymer is placed in a bag soluble in sewage and the bag is immersed in sewage, when the bag is dissolved, the super absorbent polymer can rapidly absorb the liquid and make the sewage solid.

In the electronics industry, superabsorbent polymers can also be used as humidity sensors, moisture measurement sensors and water leakage detectors. Superabsorbent polymer can be used as heavy metal ion adsorbent and oil absorbing material.

In a word, high water absorbent polymer is a kind of very widely used polymer material, vigorously developing high water absorbent polymer resin has a huge market potential. This year, how to further promote and use the absorbent polymer is an urgent task facing the agricultural and forestry science and technology workers under the condition of drought and little rain in the northern part of our country. In the process of the implementation of the Western development strategy, the development and application of a variety of practical functions of the superabsorbent polymer in the work of soil improvement will have realistic social and potential economic benefits.