Four Factors Affecting the Quality of Amino Resin]

the main factors affecting the quality of amino resin are: melamine quality, catalyst dosage, reaction conditions, dehydration process, etc. For amino resin, I think everyone is no stranger. In order to better improve the quality of amino resin, I have compiled some precautions. I hope you can have a good look.

1. the quality of melamine melamine, the quality of amino resin performance has a great influence. Practice shows that solubility experiments should be done before producing amino resin. The mass ratio of melamine to formaldehyde is 1.0: 1.25. If the two are mutually soluble at 80 ℃ for ≤ 10 min, the melamine can be used. Can also be used to analyze the content of impurities to confirm whether the melamine is qualified.

2. The practical production of catalyst dosage shows that the dosage of phthalic anhydride and magnesium carbonate has a significant effect on the etherification reaction rate under the same time condition of hydroxymethylation. Generally, the dosage of magnesium carbonate is 0.2 percent of melamine, and the dosage of phthalic anhydride is 0.6 percent of melamine. The transparency and other properties of amino resin are more ambitious.

3. reaction conditions in the etherification stage, if the etherification reaction time is too short, the etherification degree of the resin is low, the molecular mass is small, and the stability is poor; if the etherification reaction time is too long, the molecular mass of the resin is too large, the water will sink to the bottom, easy to gel. Confirmation of hydroxymethylation reaction conditions: at temperature (90±2) DEG C, insulation 3 h, reaction system pH = 6.0~6.5 etherification reaction conditions: at reflux temperature, adhere to the 1.5 h, the reaction system pH = 4.5.

4. Dehydration process Dehydration process is one of the important links to ensure the quality of amino resin. The dehydration process advocates the selection of water separation 2 atmospheric pressure 2 decompression dehydration process, which improves the quality and storage stability of amino resin.