| 摘要 |
Methods for producing high-molecular products from materials containing collagen which may be used in light industry in the manufacture of leather-like material are described. A mass is produced from leather raw material by means for machining and chemical processing. This mass contains broken up collagen and partially separated collagen free proteins. It is frozen, and after thawing undergoes final processing to produce semi-finished product. To obtain a semi-finished product with a polymer structure with high physico-mechanical properties, untanned leather waste is used to prepare a collagen solution. A compound is also prepared from tanned leather waste with solid matter particles 0.2 to 0.6 mm in size. The solution and the compound are combined, filtered until the particles are 0.2-0.6 mm, cooled to 0-5 DEG C, and a cross-linking agent is added at the rate of 0.15-7.0 % by mass. The mixture is homogenised. It is then deep frozen at a temperature range of minus 14 DEG C to minus 75 DEG C for 0.1-2.0 hours and kept frozen at minus 2 DEG C to minus 20 DEG C. After thawing the polymer material obtained is left to lie at room temperature, wet for 6-12 hours, then heated to 85 - 105 DEG C, cooled to room temperature, treated with an al kali-saline solution with a pH of 9-10 for 10 to 20 minutes and wrung out until the residual moisture content is 30 - 40 %. Then the material is subjected to hot pressing and further exposed to air at no load for 12 - 24 hours. To give the semi-finished product a leather-like appearance it can be subjected to additional tanning processing. |
