Determination of resin moisture content
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I have seen a standard for determining the water content of resins, which is GB5757-86; it applies to ion exchange resins that can be dried continuously at temperatures between 105 and 110°C without undergoing any chemical changes. So, is there any standard for resins that are not suitable for such temperatures? Thank you! Also, it seems that gel-type resins generally cannot withstand such high temperatures!
Resin is generally considered to be a normal metabolic product or secretion of plant tissues; it often coexists with volatile oils in the secretory cells of plants, as well as in resin canals or vessels, especially in the vessels found in the heartwood of perennial woody plants. A mixture composed of various components, usually an amorphous solid with a slightly shiny surface, hard and brittle; a few forms are semi-solid. It is insoluble in water and does not swell when exposed to water; it is readily soluble in alcohol, ether, chloroform, and most other organic solvents. It softens when heated and eventually melts; it produces thick smoke when burned, along with a distinctive aroma or odor. They are divided into two main categories: natural resins and synthetic resins. Rosin, benzoin, etc. are natural resins, while phenolic resins, polyvinyl chloride resins, etc. are synthetic resins. Resin is the main raw material for manufacturing plastics, and it is also used to make coatings, adhesives, insulating materials, etc. Resins are divided into natural resins and synthetic resins. Natural resins refer to amorphous organic substances obtained from the secretions of plants and animals in nature, such as rosin, amber, and shellac. Synthetic resins refer to resin products obtained through chemical synthesis of simple organic compounds or via chemical reactions of certain natural substances.
The determination of moisture content in ion exchange resins is **standardized; the same method is applied to all types of ion exchange resins, including macroporous ion exchange resins and gel-type ion exchange resins. The standard specifies that resin of a precise weight be dried continuously in an oven at 105°C for 2 hours; the ratio of the weight loss to the original weight of the resin represents the moisture content of the resin.