潮湿环境下壁画修复材料初步研究

发布时间：2018-07-20 18:24

【摘要】：本论文主要研究正硅酸乙酯及改性物在潮湿环境下的固化催化剂和改性正硅酸乙酯材料的成膜性能。研究得出的主要结论有： (1)盐酸、三氯化铝、二月桂酸二丁基锡对TEOS有良好的催化效果。用盐酸、三氯化铝作催化剂时,TEOS成膜透明,但开裂。钛酸四正丁酯、草酸、柠檬酸对TEOS有催化作用,但它们作为催化剂时,TEOS不成膜。氟化钠、硼酸、氨水、N-N二甲基甲酰胺、溴化锂、硅酸铝等对TEOS几乎无催化效果。 (2)甲基三甲氧基硅烷、甲基三乙氧基硅烷、丙基三甲氧基硅烷、丙基三乙氧基硅烷分别与正硅酸乙酯复配,不能解决正硅酸乙酯单独成膜开裂的问题。在复配材料中加入改性类化学添加剂N-N二甲基甲酰胺,可以缩短其固化时间,但不能彻底解决其成膜开裂的问题。 (3)与单独使用正硅酸乙酯相比,用烷基硅氧烷改性正硅酸乙酯非均相反应得到的低聚体在干燥环境下具有良好的成膜性能。低聚体合成时,在水与单体的摩尔比大于1.67,盐酸加入量约为单体物质的量的0.05%,非均相反应6h等条件都相同的情况下,控制TEOS与WD-921的摩尔比为1：2,TEOS与JHN313的摩尔比为1.25：1,TEOS与JHN318的摩尔比为1.5：1,TEOS与JNH3112的摩尔比为2：1,合成的四种低聚体在干燥条件条件下成膜性能较好。除WD-921和TEOS合成的低聚体在潮湿环境中的成膜性能较好外,其他单体和TEOS合成的低聚体在潮湿环境中不成膜。
[Abstract]:In this paper, the film forming properties of ethyl orthosilicate and its modifiers in wet environment were studied. The main conclusions are as follows: (1) Hydrochloric acid, aluminum trichloride and dicarboxylic acid Ding Ji tin have good catalytic effect on TEOS. Using hydrochloric acid and aluminium trichloride as catalyst, TEOS film is transparent but cracking. Tetrabutyl titanate oxalic acid and citric acid can catalyze TEOS but when they act as catalysts TEOS does not form film. Sodium fluoride, boric acid, ammonia water N-N dimethylformamide, lithium bromide and aluminum silicate have little catalytic effect on TEOS. (2) Methyl trimethoxysilane, methyl triethoxy silane, propyl trimethoxysilane, propyl trimethoxysilane, The combination of propyl triethoxy silane and ethyl orthosilicate could not solve the problem of single film forming cracking of ethyl orthosilicate. Adding N-N dimethylformamide, a modified chemical additive, can shorten the curing time, but it can not completely solve the problem of film-forming cracking. (3) compared with the use of ethyl orthosilicate alone, N-N dimethylformamide can shorten the curing time of N-N dimethylformamide. The oligomer prepared by the heterogeneous reaction of ethyl orthosilicate modified with alkyl siloxane has good film-forming properties in dry environment. When the molar ratio of water to monomer is greater than 1.67, the amount of hydrochloric acid is about 0.05% of the monomer, and the heterogeneous reaction time is 6 h, the reaction time of the oligomer is the same when the molar ratio of water to monomer is greater than 1.67, and the amount of hydrochloric acid is about 0.05% of the monomer. The molar ratio of TEOS to WD-921 is 1: 2, the molar ratio of TEOS to JHN313 is 1. 25: 1. The molar ratio of TEOS to JHN318 is 1.5: 1. The molar ratio of TEOS to JNH3112 is 2: 1. Except that the oligomers synthesized by WD-921 and TEOS had better film-forming properties in humid environment, the other monomers and TEOS synthesized oligomers did not form films in wet environment.
【学位授予单位】：兰州理工大学
【学位级别】：硕士
【学位授予年份】：2010
【分类号】：K854.3

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