文章信息/Info

Title:

Progress in Research of Crack Free Organosilane Consolidants for Stone Conservation

作者:

羅宏杰; 劉溶; 黃曉

（1.中國科學(xué)院上海硅酸鹽研究所 古陶瓷國家重點(diǎn)實驗室，上海200050）��
（2.上海大學(xué)，上海 200444）

Author(s):

LUO Hongjie; LIU Rong; HUANG Xiao

（1.Key Scientific Research Base of Ancient Ceramics, State Administration for Cultural Heritage, ��Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China)��
（2.Shanghai University, Shanghai 200444, China）

關(guān)鍵詞:

有機(jī)硅; 石質(zhì)文物保護(hù); 防開裂; 納米粒子

DOI:

10.7502/j.issn.1674-3962.2012.11.01

摘要:

由于石質(zhì)文物具有特殊的結(jié)構(gòu)，所以易遭受來自環(huán)境的侵蝕。有機(jī)硅是常用的石質(zhì)文物保護(hù)材料，它作用于基體孔隙，凝膠化，增強(qiáng)礦物粒子間作用力，可提高石質(zhì)基體耐候性能，起到一定的加固作用。然而，有機(jī)硅材料作用在基體上后，在干燥收縮過程中常常發(fā)生開裂，這樣反而加速石質(zhì)基體受到的水鹽破壞，嚴(yán)重時甚至造成基體的崩解。對有機(jī)硅進(jìn)行化學(xué)改性可以在一定程度上抑制這種開裂，如添加彈性鏈段，添加納米粒子，通過增大保護(hù)材料彈性模量或降低有機(jī)硅收縮過程中的毛細(xì)應(yīng)力，可以起到一定的防開裂效果。簡要回顧了有機(jī)硅運(yùn)用于石質(zhì)文物保護(hù)的歷史，闡述了凝膠化干燥過程中的開裂機(jī)理，對近些年來防開裂的探索進(jìn)行了分析。同時展望了不開裂的復(fù)合保護(hù)材料的應(yīng)用前景，為今后的石質(zhì)文物保護(hù)材料研究提供了思路。

Abstract:

Stone relics tend to be corroded by environment, due to their special porous structures. Organosilane consolidants are frequently used in protecting stone relics. The gels formed in stone porous by organosilanes can enhance strength of stone and improve its resistance to weathering. However, it is known that the resulting silica gel tends to develop cracks inside the stone as the gel shrinks during aging and drying, which may accelerate the erosion from environment and lead to serious problems. Modifying of organosilanes may control the issue to certain extent, by adding flexible segments or nanoparticles for instance. In this report, we first give a brief review on the history of development and use of organosilanes as consolidants and then demonstrate the possible mechanisms of gel cracking during drying and aging, and further discuss potential ways of obtaining crack free silicate consolidants.