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Method for preventing hydrophobic chemical protection layer on immovable cultural artifact surface desquamating

A protective layer, hydrophobic technology, applied in the direction of the device, coating, building structure, etc. to apply liquid on the surface, to achieve the effect of good permeability and weather resistance, and alleviate the damage

Inactive Publication Date: 2008-08-06
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since there is no report on the measures to prevent the peeling of the hydrophobic chemical protective layer, a series of experimental studies have been carried out in order to solve this problem, and it is found that this phenomenon can be prevented or reduced by properly selecting chemical materials and using some technical measures. Peeling phenomenon caused by hydrophobic chemical protection

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A hydroxyacrylic microemulsion was first prepared. After hydroxyethyl methacrylate, methyl methacrylate, butyl acrylate and acrylic acid were removed from the polymerization inhibitor, they were formulated into a monomer mixture in a ratio of 3.5:5.0:6.3:0.2; Add the calculated amount of the aqueous solution of the emulsifier sodium lauryl sulfate and the co-emulsifier cyclohexane dissolved by the ultrasonic cleaner to the four-necked flask with the thermometer, the condenser tube and the dropping funnel, and then add 1 / 4 of the prepared The monomer mixed solution; the temperature of the water bath was raised to 75°C, and after 30 minutes of nitrogen gas, half of the initiator ammonium persulfate accounting for 0.05 of the total monomer mass was added, and then the remaining 3 / 4 of the monomer mixed solution was added dropwise within 2 hours. The remaining 1 / 2 of the initiator; followed by heat preservation reaction for 1 hour; cooling to 40°C, adding ammonia water drop...

Embodiment 2

[0031] Same as Example 1, except that the fluororubber solution is changed into a silicone solution, that is, 8% partially polymerized cetyltrimethoxysilane butyl acetate solution is used as the surface layer chemical protection agent. Results The sandstone sample protected by three layers of chemical protection went through 7 damage cycle experiments, and it was found that there was a slight damage between the protected part and the unprotected part on the side surface of the sample, with a mass loss rate of 4.2%, and a water contact angle of the protected surface from 119 degrees is reduced to 93 degrees, and the antifouling effect on blue ink is reduced (from 5 points to 3 points). The reversible rate of one suction is about 14%.

[0032] The control experiment of embodiment 2

[0033] Same as Example 2, except that the chemical protective agent of the base layer and the chemical protective agent of the transition layer are impermeable, that is, the surface monolayer is pr...

Embodiment 3

[0035] Same as Example 1, except that the chemical protection of the transition layer is not implemented, that is, only the hydroxyacrylic acid microemulsion and the fluorine rubber solution are used for double-layer chemical protection. Results After 7 cycles of failure experiments on the sandstone sample, the surface of the sample did not show any change, the mass loss rate of the sample increased slightly to 1.2%, and the contact angle of the protected surface decreased from 113 degrees to 91 degrees. The antifouling effect is basically unchanged, that is, 5 points remain unchanged. The reversible rate of one suction is about 21%.

[0036] The control experiment of embodiment 3

[0037] Same as Example 3, except that the fluororubber solution is changed into a silicone solution, that is, 8% partially polymerized cetyltrimethoxysilane butyl acetate solution is used as the surface layer chemical protection agent. Results After 7 times of damage cycle experiments on the sand...

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Abstract

The invention discloses a method for preventing surface hydrophobicity chemical protection layer on unmovable cultural relics from scaling off. According to related chemical and physical properties of chemical materials, including the hydrophilicity-hydrophobicity, penetration capacity, reinforcing and protecting capability, aging resistance, and reversibility, and combining with the material composition of the body of the protected cultural relics, the invention adopts the multi-layer chemical material with a gradient ranging from hydrophilicity to hydrophobicity grade by grade to obtain protection; the chemical material with stronger permeability and a certain hydrophilicity is used as a fundamental protection layer and the chemical material with stronger hydrophobicity and aging resistance is used as a surface protection layer or the transition protection layer is adopted to link the fundamental protection layer with the surface protection layer. When the construction is implemented, the fundamental layer material is penetrated, then the transition layer material is penetrated, and finally the surface layer material is penetrated. The method for preventing surface hydrophobicity chemical protection layer on unmovable cultural relics from scaling off can obviously reduce the interface stress between the chemical protection layer and cultural relic base material, and reduce the hazard of scaling-off of the chemical protection layer; with a certain reversibility, the method basically does not change the appearance of cultural relics, has better permeability and weatherability and can meet requirements for protection and reinforcement on the surface of unmovable cultural relics.

Description

technical field [0001] The invention belongs to the technical field of cultural relics protection. Specifically, the invention relates to a method for preventing the peeling off of the hydrophobic chemical protective layer on the surface of immovable cultural relics. Background technique [0002] According to the principle of minimal intervention and not affecting the original appearance of cultural relics, the best way to protect them is to improve the storage environment of cultural relics. Obviously, for most immovable cultural relics made of soil, stone, brick and other materials, it is difficult to complete the environmental change in a relatively short period of time. In order to save endangered immovable cultural relics, the easiest way is to use chemical protection or chemical reinforcement materials on the surface of the cultural relics for chemical protection. At present, the commonly used protective materials are hydrophobic organic polymers, among which compoun...

Claims

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Application Information

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IPC IPC(8): C04B41/52C08L33/14C08L83/04C08L27/12B05D1/36B05D7/24E04G23/02
Inventor 张秉坚铁景沪刘婷曾余瑶王旭东
Owner ZHEJIANG UNIV
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