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Leather Study of resistance to dry heat

The process of pre-treatment system. Some of the hide powder oxygen bond and the rules of natural collagen structure has been destroyed. However,[link widoczny dla zalogowanych], some parts of the tanning process has not been fully tanned. Its heat stability to collagen thermal stability than the natural lower. Reflected in its relatively low initial temperature of shrinkage. Chrome tanning can produce additional collagen cross-linking between. Stability of the structure of its collagen. Contraction in the event of more energy needed to overcome the chromium produced by forced labor. The stability of the cross bond. Improved performance in its thermal stability (shrinkage rate has dropped,[link widoczny dla zalogowanych], the final shrinkage temperature increase) So. Contraction of chrome tanning powder in a wide temperature range of 2.3 occurred 『different sealed chrome tanned leather tanning agent powder,[link widoczny dla zalogowanych], the relationship between shrinkage and the temperature 4 3 Xin curves shown are the chrome tanning agent with different Tanned powder shrinkage and temperature curve. d kinds of chrome tanning agents are liquid sugar reduction of chromium,[link widoczny dla zalogowanych], KCr <SO. ):, Cr (N0) and CrC1. . Can be seen that chromium tanning solution in the same situation in the c total chromium content of Cr10 are 1OgI). Shrinkage temperature of the final shrinkage temperature of about the same + start and end of the contraction rate is not owned sugar reduction with their towels tanning solution tanned hide powder was only the final contraction of l2. The chrome tanned leather nitrate powder and chromium chloride tanned hide powder l5 and 36, respectively, including chrome tanning process chromium ion penetration to the skin and the original {soy combination with collagen 2 process. Trivalent chromium ion in aqueous solution to form the first multi-row chromium complexes J. The charge of its molecular size and status will directly affect the final penetration of the combination of speed and strength. Will directly affect the stability of dry heat resistance of leather and chrome with different anions ability to form different complexes. Difficult to participate in the coordination of chloride ion. The sulfate ion is easy to participate in the coordination of nitrate ions in between. Reducing sugar contained in chrome tanning solution to participate in the coordination role of organic ligands most. The result is that they were formed and charged state of the molecular size of the different complexes. The nature of the different chromium complexes. The production of tanning ability and use of tanning are also different, so tanned leather powder of different resistance to dry heat stability. Chromium potassium sulfate contrast leather tanning powder drying shrinkage curve (Figure 2) can be seen. Chrome-tanned leather powder chloride contraction curve and 2 closing association curves of samples similar to sample No. 2 in the chromium containing (in cr! O meter) 5g / I potassium chromium sulfate tanning tanning solution obtained. Note the presence of chloride ions makes the chrome and leather powder material with Taiwan, the combination of collagen crosslinking degree dropped by half. It can be seen: in the ancient chromium ion in the same solution for chrome tanning. Sugar reduction of chromium tanned leather powder, liquid resistance to dry heat is much better than chromium chloride solution tanning tanning effect of testosterone Jing _ Figure 3 different tanning tanning dry skin will shrink Wei Qu 3 Conclusions 1] The drying of the skin stroke by the dry powder and then role. The dry heat shrinkage starting temperature, but will not dry skin than the powder early, but the final shrinkage rate decreased. Help the drying process will change the internal structure of the leather. To improve the leather's resistance to dry heat Majesty can have significant effect. 2) the system is not uniform tanning powder is high. Although the overall shrinkage temperature is lower. But the contraction narrow range regardless of chrome tanned leather powder to what extent, the contraction than the initial temperature is not low-tanning powder, shrinkage did not end temperature than the high tanning powder. Wider temperature range contraction. Tanned hide powder after the final shrinkage rate than the low is not tanned hide powder. 3) on different chrome tanned leather tanning agents to compare the results of powder: chrome tanning agent because of different anions and chromium contained in the mode of action and the ability to form different complexes. Powder on the skin acts of resistance to dry heat has a considerable impact too, 4) used four kinds of chrome tanning agents, sugar, leather tanning solution to restore chrome powder the best resistance to dry heat.