Characterization， Property and Application of Silicone Acrylic Emulsion as a Kind of Protection Material for Murals

doi:10.19894/j.issn.1000-0518.220372

Chinese Journal of Applied Chemistry ›› 2023, Vol. 40 ›› Issue (7): 1004-1016.DOI: 10.19894/j.issn.1000-0518.220372

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Characterization， Property and Application of Silicone Acrylic Emulsion as a Kind of Protection Material for Murals

Xiao-Yun FANG¹^,²^,³, Lin-Yi ZHAO¹^,², Lei WANG¹^,²^,⁴, Lin-Zhi LI¹^,², Jie YU⁵, Quan-Fang LU⁵, Yan-Fei LI¹^,²()

^1.National Research Center for Conservation of Ancient Wall Paintings and Earthern Site Dunhuang Academy，Dunhuang 736200，China
^2.Key Scientific Research Base of Conversation for Ancient Mural，Dunhuang 736200，China
^3.Gansu Mogao Grottoes Cultural Heritage Protection Design Consulting Co. LTD，Dunhuang 736200，China
^4.Technical Service Center of Cultural Relic Conservation，Dunhuang Academy，Dunhuang 736200，China
^5.College of Chemistry and Chemical Engineering，Northwest Normal University，Lanzhou 730070，China

Received:2022-11-15 Accepted:2023-06-21 Published:2023-07-01 Online:2023-07-19
Contact: Yan-Fei LI
About author:19063487@qq.com
Supported by:
the National Key R&D Program of China(2019YFC1520700);the Key R&D Projects of Gansu Provincial Science and Technology Department(20YF8FA014);the Opening Topic of Gansu Provincial research Center for Conservation of Dunhuang Cultural Heritage(GDW2021YB04);the College Project of Dunhuang Academy(2012-KJ-QN-2)

Abstract

Abstract:

In order to establish a complete and objective evaluation method in theory for property， a systematic study of silicone acrylic emulsion is carried out in this paper. The thermal stability， structure， morphology and particle size of silicone acrylic emulsion are characterized and analyzed. The relationship between the concentration of silicone acrylic emulsion with its viscosity and surface tension is investigated. In addition， to further verify the properties， the silicone acrylic emulsion is used for repairing the flaking and disrupting murals. The results show that the silicon acrylic emulsion is amorphous， the particles are nearly spherical without agglomeration， and its average particle size is 190 nm. The thermal stability and thermal aging resistance are improved effectively due to the introduction of Si—O—Si bond. With the increase of silicon-acrylic emulsion concentration， the surface tension decreases and the relative viscosity increases. Silicon-acrylic emulsion has good mechanical stability， storage stability， thermal stability and salt tolerance. Silicon-acrylic emulsion is used for restoration of the flaking and disrupting murals as cementing materials after aging experiment in various conditions. It is shown that silicone acrylic emulsion is a suitable material for mural conservation. All results indicate that silicon-acrylic emulsion can be used as a kind of excellent cementing material in repairing the flaking and disrupting mural.

Key words: Silicone acrylic emulsion, Microstructure, Mural, Culture relic protection, Culture relic restoration

CLC Number:

O631

Xiao-Yun FANG, Lin-Yi ZHAO, Lei WANG, Lin-Zhi LI, Jie YU, Quan-Fang LU, Yan-Fei LI. Characterization， Property and Application of Silicone Acrylic Emulsion as a Kind of Protection Material for Murals[J]. Chinese Journal of Applied Chemistry, 2023, 40(7): 1004-1016.

Figures/Tables 13

Fig.1 Particle size distribution （A） and TEM image （B） of the silicone acrylic emulsion

Fig.2 FT-IR spectra of adhesive film for the silicone acrylic emulsion （a） and silicone acrylic emulsion-Na2SO4 （b）

Fig.3 The XRD patterns of adhesive film for the silicone acrylic emulsion （a） and silicone acrylic emulsion-Na2SO4 （b）

Fig.4 The TG-DTG curve of adhesive film for the silicone acrylic emulsion

Fig.5 SEM images of the silicone acrylic emulsion and the silicone acrylic emulsion-Na2SO4 freeze-dried （A， C） and dried at room temperature （B， D）

Fig.6 Water absorption of adhesive film for the silicone acrylic emulsion （a） and silicone acrylic emulsion-Na2SO4 （b） with time change

Fig.7 The effect of nass fraction of the silicone acrylic emulsion （a） and silicone acrylic emulsion-Na2SO4 （b）on pH

Fig.8 The change of conductivity of the silicone acrylic emulsion （a） and silicone acrylic emulsion-Na2SO4 （b） with different concentration

Fig.9 The change of surface tension of the silicone acrylic emulsion （A） and silicone acrylic emulsion-Na2SO4 （B） with the different mass fraction in different temperature and the effect of concentration of the silicone acrylic emulsion and silicone acrylic emulsion-Na2SO4 on the surface tension（C）

Fig.10 The change of viscosity of the silicone acrylic emulsion （A） and silicone acrylic emulsion-Na2SO4 （B） with the different mass fraction in different temperature

Fig.11 The photographs of 1%~3% silicone acrylic emulsion before （A） and after （B） freezing and thawing and silicone acrylic emulsion containing different salts （C） before and after freezing and thawing

Fig.12 The photograph of simulated test block（A）， simulated flaking mural test block（B）， mass fraction 2.5% silicone acrylic emulsion repaired flaking mural（C） and aging 20 cycle of flaking mural（D）

Fig.13 Picture of plaster disruption murals（A） and murals repaired by mass fraction of 2.5% silicone acrylic emulsion （B）， SEM images of murals repaired by by mass fraction of 2.5% silicone acrylic emulsion （C） and aged for 12 cycles （D）

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Characterization， Property and Application of Silicone Acrylic Emulsion as a Kind of Protection Material for Murals

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