Physical Structure of Ion Exchange Resin

　　Ion exchange resins are suitable for adsorbing inorganic ions. Their diameters are small, generally 0.3-0.6 nm. These resins can not adsorb macromolecular organic substances, because the latter has a larger size, such as protein molecular diameter of 5-20 nm, and can not enter the micropore of these resins.

　　Macroporous resins are prepared by adding pore-forming agents to form porous spongy skeleton and introducing a large number of permanent micro-pores into the exchange group. It has both micro-pore and macro-pore, and the pore size of wetting resin is 100-500 nm. Its size and quantity can be controlled during manufacture. The surface area of the channel can be increased to more than 1000m2/g. Huizhu Resin Company not only provides good contact conditions for ion exchange, shortens the path of ion diffusion, but also adds many chain active centers, which can adsorb various non-ionic substances like activated carbon and expand its function through molecular adsorption through Van de Waals force. Some macroporous resins without exchange functional groups can also adsorb and separate various substances, such as phenols in wastewater from chemical plants.

　　The macroporous resin has many large pores, large surface area, many active centers, fast ion diffusion rate, and fast ion exchange rate, which is about ten times faster than that of gel type resin. The utility model has the advantages of fast action, high efficiency and shorter processing time. Macroporous resins also have many advantages: swelling resistance, non-fragmentation resistance, oxidation resistance, wear resistance, heat resistance and temperature resistance, and easy adsorption and exchange of organic macromolecule materials, so they have strong resistance to pollution and easy regeneration.

　　The polymer skeleton of gel type resin has no pores in dry condition. It swells when it absorbs water, forming very fine pores between macromolecular chains, commonly known as micro-pore. The average pore size of the wetting resin is 2-4 nm (2*10-6-4*10-6 mm).