The invention discloses a salt-free
pickling-free amphoteric
polymer chrome-free tanning agent which is characterized in that according to the salt-free
pickling-free amphoteric
polymer chrome-free tanning agent, firstly, organic amine and
fatty aldehyde with active alpha-H undergo
Mannich reaction, a
Mannich base midbody with a
formyl group is obtained, and then, after an allyl
monomer with the
formyl group is generated in the original position of the midbody, the midbody, the allyl
monomer with a cation and allyl acid undergo free
radical polymerization, and the salt-free
pickling-free amphoteric
polymer chrome-
free agent is obtained. The salt-free pickling-free amphoteric polymer chrome-free tanning agent is a polymer tanning agent containing the
formyl group and has certain filling capacity, tanning properties of the salt-free pickling-free amphoteric polymer chrome-free tanning agent are rival with the properties of an existing aldehydes tanning agent, molecular weight is large, when the salt-free pickling-free amphoteric polymer chrome-free tanning agent is in use, a leather blank is free of pickling, salt
pollution in the follow-up processes can be eliminated, carboxyl and amino contained by the agent can further prompt absorption to follow-up finishing materials by the leather blank, and the whole quality of a leather is improved. According to preparation of the salt-free pickling-free amphoteric polymer chrome-free tanning agent,
air pollution due to raw materials is avoided, chrome and NaCl
pollution of a traditional tanning agent is avoided, processes are reduced,
silicate consumption is reduced, and cost is reduced.