| 摘要 |
For the manufacture of artificial wool, cotton, &c. consisting essentially of casein, there are employed spinning solutions in which the solvent for the casein is sodium hydrate or potassium hydrate or mixtures thereof. The proportion of alkali to casein is approximately in the ratio of 23 litres of 35 DEG B</>ae. sodium hydrate to 100 kilos. of casein; and in the preparation of the solution, the casein is first stirred with water, the caustic alkali solution then added and stirring continued either continuously or at intervals until a uniform product is obtained, the solution being allowed to mature and if necessary diluted by the addition of milk serum obtained from the coagulation process subsequently neutralized, or by a solution of sodium lactate, formate or disulphite, or by soap solution, 100 kilos of casein producing approximately 400 litres of solution. Solution and maturing may take place at 24 DEG C., or generally between 14-34 DEG C.; when during maturing the desired working viscosity has been developed, maturing may be checked by lowering the temperature. To the casein solution tnere may be added carbon disulphide, sodium sulphide, cellulose xanthogenate or the products obtained by treating soaps, glycerin, &c. with alkali and carbon disulphide, or generally sulphides and xanthogenates, in order to accelerate the subsequent coagulation of the casein from its solution during the spinning operation. Specifications 483,731 and 483,807 are referred to.
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