| 摘要 |
The method for obtaining adhesive from protein waste, especially leather waste from the tanning, meat and fish processing industries in the form of hydrolyzed proteins obtained through alkaline or acidic or enzymatic or thermal hydrolysis. Hydrolyzates are subjected to polycondensation reaction with application of aldehydes and aliphatic or aromatic amines and it is mixed with modifying and improvement additions. Aldehyde, favourably formaldehyde in the quantity from 2:1 to 5:1 in relation to dry matter of hydrolyzate is introduced gradually to hydrolyzed protein water solution, favourably collagen hydrolyzate. Condensation reaction is carried out, favourably in alkaline environment, gradually dosing urea into the solution in the quantity from 1:1 to 3:1 in relation to dry matter of hydrolyzate for the period of 1 hour to 5 hours in temperature from 45°C to 75°C, favourably 70°C. Simultaneously, it is mixed and salt content from 1 % to 3 % by weight of dry matter of hydrolyzate is supplemented. Next, the reaction mixture is evaporated, after the modifying and biocidal additions are introduced into the concentrated solution and after mixing a homogeneous solution of protein adhesive is obtained. |
