The Fluorinated Polymers And Its Conservation Study On Culture Heritage

Many precious historical relics are going to ruin increasingly because of the deterioration of nature factors. It is firmly believed that cultural relics can obtain to prolong its life span only depending on the combinations of traditional methods together with the modern science and materials. Therefore, the study of the multi-functional materials and especially suitable for the protection utilization of cultural object has become an urgent mission.The problems and shortage of previous reinforce and protection materials used for porous relics were understood on the basis of completely overview to their structure characteristics and property, to the influence factors, deterioration characteristics of the cultural object, as well as evaluation methods. On the other hand, the structure feature, special characteristics and the viability assessment in cultural relics of fluorinated polymers were proposed in this paper. So, a possible research way, including the synthesizing of fluorinated polymers, the completely and systematically study of the polymers in the reinforcing of cultural object, and final application to true cultural object protect, was proposed.Two kinds of fluorinated polymer were abstained in that CTFE and TFE served as the main monomers separately, the short name are F-OH and F4- SS inceptively, which not only can be dissolved in normal solvents, but also are suited for the conservation purpose of cultural object. Meanwhile, the choose of monomers composition, the amount of curing materials, the token of surface characteristic and the glass transition temperature of fluorited polymers were discussed, with the help of FT1R, DSC, and SEM analysis.The investigation of a lot of parameters about treated sandstone, brick materials and earthen materials with fluorited polymers has been carried out, such as the formation of polymer, the penetration depth, porosity, capillary absorption and penetration coefficient, water uptake, compressive strength, drilling resistance, absorption isotherms of water vapor, water vapor diffusion, color changes as well as resistance to desegregation of water, frizzing-throwing cycles, worming-cooling cycles, and so on. In addition, the influence of salt crystallization, acid and base, and UV aging have also been assessed in order to better understand the protection effects and utilization possibility of two fluorinated polymers, mainly according to ASTM standard and the combination of international methods together with general technological. The protection mechanism was analyzed on the understanding of filming cohesion, filling vacant and composite effect. Finally, several application standarded areas of foluranted polymers were proceeded, for example, practice to big wild goose Pogoda of Tang Dynasty, to Banpo archaeological Site of Yanshao Time, to Zhongshan Grotto sandstone of Jin period, to Zhongguan mint pottery mould of Han Dynasty, and to neolithic polychrome pottery, etc.The research clearly expressed that two of fluranted polymers proposed the excellentanti-chemicals; good bear aging and wonderful size stability. The penetration depth of 10%-30% F-OH or F4-SS are 7-10 cm for earthen materials, 10-15cm for sandstone of 25% porosity, 5cm for 15-20% porosity, 5-7cm for brick of 30% porosity. The reinforce strength is obviously enhanced to 2-5 times, and performed an even distribution with penetration depth. Because of the capillary coefficient decreed obviously, two of fluranted polymers provided excellent resistance to water desegregation. From this point of view, the fluranted polymers have the stronger waterproof function and resistance to acid and alkali corrosion. Because of the reinforce treatment has no obvious influence to porosity, fluranted polymers proposed well ventilated function that does not affect the breath of cultural object, which can help to keep the cultural object long life. That is to say that the polymers are good enough to bear salt decay, acid erosion and UV aging for a long time. Fluranted polymers provided an excellent e...