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nature : formaldehyde, furfural, Dialdehyde starch (dialdehyde starch), glutaraldehyde (glutaraldehyde) chemical tanning method. Formaldehyde can be closed skin collagen polypeptide chain of amino side chain, and more than two peptide chains formed methylene bridge, adjacent peptide chain amino "Suture" and have used tanning production. Glutaraldehyde with skin collagen and the amino-hydroxy reaction, generate more solid cross-linked bond. Formaldehyde tanning leather color white light. Glutaraldehyde higher prices, the leather tanning color yellow. Aldehyde tanning (especially glutaraldehyde tanning) is a good sweat-resistant and washable, and a certain degree of acid, alkali and oxidant and reductant capabilities, but the leather shrinkage temperature is only 80-90 ° C, fullness less. Actual production rarely used alone aldehyde tanning, and more chrome tanning salts or other combination of agents for tanning. Formaldehyde used fur tanning, skin white, light texture. Furfural for chrome tanning pre-tanning agent.
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