Aging Characteristic Study On Excavation Of Humid Environment For Silk

Silk is an important cultural heritage of China history, in various dynasties there are all kinds of people who love. Since the vast majority of long silk relics buried in the bottom, and it was released out of silk artifacts but also by the various influences of underground and aboveground, Making unearthed silk for fragile. Many researchers have unearthed silk cultural relics of aging assessment and restoration, But the unearthed silk cultural relics is very precious. Not possible for a large number of sample experiments, in response, researchers have studied the silk of accelerated aging. But because of geographical reasons, Most silk relics were unearthed in a humid environment is excavated, so consider this paper for hydrolysis aging, thermal aging to simulation of silk fabrics, Appropriate choice of characterization methods, the aging of silk fabrics and aging degree to analyzed. Trying to find the law of aging silk, and analyze the aging characteristics.In this paper, the hydrolysis aging and thermal aging of silk cultural relics, analysis of aging and the aging process of aging silk with mechanical properties, degree of yellow value, structure, and amino acid content in four angles. Where in the mechanical properties and degree of yellow value can be macro analysis, the mechanical properties due to irreversible damage to silk, in addition fragile of ancient silk fabrics, no use test of ancient silk fabrics, the analysis of the structure and amino acid analysis from microscopic mechanism, and the analysis of the characteristics of aging.Research shows that the change of mechanical properties to characterize silk obvious aging and aging degree, when the pH in acidic conditions, mechanical properties can reduce the incidence, the pH of the alkaline environment, mechanical properties also decline occurred, So no matter how aging environment change when the aging condition of evolution more intense, Aging speed, at the same time aging time, the mechanical properties decrease, on behalf of the aged silk fabrics more serious. The chromatist analysis of aging process can very accurate reaction silk can distinguish the aging factor is hydrolysis aging or thermal aging. Temperature is 50℃ yellowness was significantly lower than 250℃, thermal aging silk is from the beginning of the amorphous region. Thermal aging silk is from the beginning of the amorphous region. As the temperature increases tyrosine and tryptophan fiber outer layer is damaged amorphous region. A yellow substance can be speed, but because of the uncertainty of hydrolysis aging, The silk degree of yellow value can not well reflect the degree of aging of silk, silk infrared spectroscopy can be characterized from the point of view of its aging condition microstructure, the occurrence of serious aging of silk, absorption peak of amide I bands have to occurs offset. When hydrolysis aging process play a significant role, infrared absorption, band 1700cm-1～1500cm-1 have to enhancements. When the silk aging degree deepened, the secondary structure of protein have to change, amide I band infrared absorption will move to low wave numbers, amide Ⅲ region by Gauss fitting, the secondary structure of protein analysis of the relative content of silk fabrics, can analyze the degree of aging. Relative content of β-fold decreased, It can be understood as folded β-conversion becomes irregular structure, It indicates that hydrogen ions began to undermine the crystallization zone, By silk amino acid analysis, when the hydrolysis of aging, the relative content of Moore for tyrosine and the content ratio of glycine and tyrosine can be used to predict the aging degree of silk. If the sample is low in tyrosine, the content ratio of glycine and tyrosine is high, analyzing samples may be more serious aging.By the conclusion of the previous analysis of the warring states period, western han period and ming dynasty aging condition of six silk fabric do analysis. Because the time span is relatively large, and not a place of cultural relics unearthed silk, so the aging condition has obvious changes, by the mechanical properties, color analysis, infrared spectra, amino acid analysis shows demerits, The six ancient silk fabrics have serious of decay, the amino acid can be analyzed in aging, and the water has obvious effect. It is long time of silk buried in the moist environment. Aging factors by the complex and diverse, even contemporaries are also very big difference, exhibit different aging condition.By studying a variety of factors we may know the process of aging of silk for role, Especially in the aging state moist environment unearthed silk evaluated, For the better from the humid environment of silk cultural relics unearthed, And their protection, Has certain practical significance.