| abstract |
The invention discloses a bisaminosulfonic acid, which has two symmetrical secondary amines and sulfonic acid groups. The invention also discloses the preparation method of the above-mentioned bisaminosulfonic acid, which comprises the following steps: mixing 1,3-propane sultone with an organic solvent, adding the aliphatic diamine dropwise to the mixture, and filtering the reaction mixture after the reaction A solid is obtained, and the solid is washed and dried to obtain bisaminosulfonic acid; the aliphatic diamine is ethylenediamine, propylenediamine or butanediamine. The invention also discloses the preparation method of the water-based polyisocyanate and the water-based paint. When the bisaminosulfonic acid of the present invention is used as a crosslinking agent, it has a higher sulfonic acid content, so the amount of the modifier is less, and the amount of the neutralizing agent is correspondingly reduced, which can make the neutralization remaining in the curing agent. The agent content is reduced, and the storage stability is improved; the coating film formed by using the water-based paint of the present invention has excellent water resistance and high gloss. |