The difference between DuPont ultrapure water polishing resins and ordinary resins
Ultrapure water polishing resin, a special resin, is made of a fine mixture of anion exchange resin and cation exchange resin, while ordinary resins are usually just a single anion exchange resin or cation exchange resin. Ultrapure water polishing resin is widely used in display equipment, computer hard disks, CD-ROM, precision circuit boards, discrete electronic devices and other precision electronic products industries due to its excellent performance. In these areas, ultrapure water polishing resins provide a solid guarantee for the precision and quality of products.
Although ordinary ion exchange resins are also widely used in daily life and industrial production, such as food and beverage processing, drinking water filtration, hard water softening, sugar industry, pharmaceutical, metal separation and pure water preparation, etc., compared with ultrapure water polishing resins, their application fields and depths are insufficient.
Due to the high cost of raw materials required in the production process of ultrapure water polishing resin, its ** is usually higher than that of ordinary resin, and even the ** of some high-quality ultrapure water polishing resin will be more than twice as high as that of ordinary resin. However, this does not affect its wide application in the precision electronics industry, because the value of ultrapure water polishing resins for companies that pursue high quality and precision is immeasurable.
In addition, the resistivity of the produced water of ultrapure water polishing resins can reach an astonishing 16 megaohms or more, which is far more than can be achieved with ordinary resins. This is also one of the important reasons why ultrapure water polishing resins are widely used in the precision electronics industry.
It is worth noting the problem of regeneration of ultrapure water polishing resins. Some ultrapure water polishing resins can be recycled, while others cannot. For ultrapure water polishing resins that can be regenerated, they need to be layered before they can be recycled, which undoubtedly increases the complexity and cost of the operation. This is not the case with ordinary ion exchange resins, as they have a single resin type and can be regenerated directly without the need for delamination.
Rohm and Haas ultrapure water polishing resin preservation method
Polishing resin, a unique chemistry that is pre-blended with highly purified and transformed H-type cation resin and OH type anion resin, has unique chemistry that allows it to play a vital role in the treatment of water. When properly filled and handled, polishing resins can be prepared at an early stage with a resistivity greater than 180mω.CM, and ultrapure water with a total organic carbon (TOC) content of less than 10 ppb, provides an indispensable pure water source for scientific research, medical treatment and industrial production.
However, the properties of this resin also determine its sensitivity to the environment. Once opened, the resin quickly absorbs carbon dioxide from the air, so it must be used as soon as possible after unpacking. For the part that is not used temporarily, it must be carefully sealed and stored in a cool place away from light, and the ambient temperature is controlled between 5-40 to ensure its stability and effectiveness.
In addition, polishing resins are highly susceptible to contamination during transportation, storage, and filling. Exposure to both inorganic and organic substances can cause damage to the resin, reducing the quality of the effluent and even affecting the operating conditions of the entire system. Therefore, it is critical to ensure that the equipment and water used for filling and operation do not contaminate the resin. All water that comes into contact with the resin should be made with high purity water, which is a resistivity greater than or equal to 10mcm, while TOC is as low as possible to 30 ppb of water. Similarly, any equipment or appliance that comes into contact with resin must be thoroughly cleaned with high-purity water before use to ensure its cleanliness, thus protecting the performance and longevity of the resin.