Oxalic acid is a colorless columnar crystal, soluble in water and insoluble in organic solvents such as ether. It has a strong coordination effect and is another kind of metal chelating agent in plant food. When it is combined with some alkaline earth metal elements, its solubility is greatly reduced, such as calcium oxalate is almost insoluble in water. It is 10,000 times more acidic than acetic acid (acetic acid) and is the strongest of organic acids. The first-order ionization constant Ka1=5.9×10^-2 and the second-order ionization constant Ka2=6.4×10^-5. It has acid commonness. Can neutralize with alkali, can make the indicator change color, can react with carbonate to release dioxide.

As a catalyst for phenolic resin synthesis, the catalytic reaction is mild, the process is relatively stable, and the duration is the longest. Oxalate acetone solution can catalyze the curing reaction of epoxy resin and shorten the curing time. It is also used as a pH regulator for the synthesis of urea-formaldehyde resin and melamine formaldehyde resin. It can also be added to the water-soluble polyvinyl formaldehyde adhesive to improve the drying speed and bonding strength. It is also used as a curing agent of urea-formaldehyde resin and a metal ion chelating agent. It can be used as an accelerant for preparing starch adhesive with KMnO4 oxidizer to accelerate oxidation rate and shorten reaction time

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