Two points to know about dibutyltin dilaurate
Dibutyltin dilaurate is widely used as a 2KPU desiccant.
Product overview
Molecular formula: chosn
CAS：77-58-7
Molecular weight: 631.55
Its chemical structure formula is:
Theoretical tin content: 18.8% (= tin atomic weight 118.71 / 631.55)
The purity of dibutyltin dilaurate in the market is 95-98%, so the tin content is generally about 18%, and many brands are called t-18.
Some points to know when using dibutyltin dilaurate
1. The tin content of regular products is about 18%. Products below this value are adulterated to reduce costs, such as products with a tin content of 9% and products with a lower price of 6% tin. Always believe that the price and the goods are right. Before, we didn’t pay attention to what means these manufacturers used to reduce tin content and cost. Recently, it was learned that a substance was mixed to reduce the tin content. It was further learned that it was a plasticizer. Finally, it was confirmed to be DOP. When I learned about the situation, I felt that I was beating drums and my forehead was sweating. DOP is now a restricted ingredient. These suppliers of low-cost dibutyltin dilaurate will not tell users that DOP is added to it. This kind of information difference will cause endless harm and harm themselves and others. In fact, it is understandable that these suppliers reduce costs and prices to meet the low-cost needs of users. However, Zhou Gong suggested that the mixing ingredients should be made public, and that non-toxic and harmless mixing schemes can be selected (you can consult Zhou Gong). It is entirely possible not to use the restricted substance DOP.
2. Regular dibutyltin dilaurate products have a freezing point of 16-23 °, so in winter, when the temperature is low, it will precipitate into solid substances, and the catalytic effect will be greatly reduced, or even no catalytic effect, which also affects the appearance performance of paint and film. The test proved that dibutyltin dilaurate was frozen overnight in the freezer of the refrigerator, and it was taken out the next day as a solid like iron. At this time, if dilaurate is replaced by acetic acid and dibutyltin diacetate is changed, the freezing point will be reduced to 7-10 °, and the low-temperature activity will be much improved. The best low-temperature activity is SN-25, whose freezing point is more than – 20 degrees. It is still a flowing liquid when it is frozen overnight in the freezer of the refrigerator. Its low-temperature activity is very good.
