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Preparing method of nanometer calcium hydroxide powder material for fixing ancient murals

A technology of calcium hydroxide and powder materials, applied in calcium/strontium/barium oxide/hydroxide, nanotechnology, preserved painting, etc., can solve the problems of long time consumption and high energy consumption, and achieve low energy consumption and synthesis Low cost, easy penetration effect

Active Publication Date: 2018-05-29
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the synthesis of nano-calcium hydroxide by Zhang Hui also requires high temperature, high energy consumption, and long time consumption (Chinese patent, patent number: 201410705481.6)

Method used

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  • Preparing method of nanometer calcium hydroxide powder material for fixing ancient murals
  • Preparing method of nanometer calcium hydroxide powder material for fixing ancient murals
  • Preparing method of nanometer calcium hydroxide powder material for fixing ancient murals

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] At 20°C, 5% dimethylformamide was added to the calcium chloride solution and stirred on a magnetic stirrer for 3 minutes. Pour the stirred calcium chloride solution into the prepared sodium hydroxide solution to synthesize nano calcium hydroxide. Wherein the molar ratio of calcium chloride and sodium hydroxide is 1:2. The synthesized nano calcium hydroxide was washed 3 times with saturated lime water. After washing, dry at 45°C for 6 hours to obtain nanometer calcium hydroxide powder.

[0027] Test Results:

[0028] 50% increase in peel strength: Permeability: 2 minutes, artificial weathering resistance 1000 hours mural without any change.

[0029] Dissolving nano calcium hydroxide powder in ethanol to form a solution, and painting the prepared solution on ancient murals; the concentration range of nano calcium hydroxide dissolved in ethanol is 3-5mg / ml.

Embodiment 2

[0031] At 22 degrees, dimethylformamide with a mass fraction of 6% was added to the calcium chloride solution and placed on a magnetic stirrer to stir for 4 minutes. Pour the stirred calcium chloride solution into the prepared sodium hydroxide solution to synthesize nano calcium hydroxide. Wherein the molar ratio of calcium chloride and sodium hydroxide is 1:2. The synthesized nano calcium hydroxide was washed 3 times with saturated lime water. After washing, dry at 50°C for 8 hours to obtain nanometer calcium hydroxide powder.

[0032] Test Results:

[0033] 48% increase in peel strength: Permeability: 1.8 minutes, 1000 hours of artificial weathering resistance mural without any change.

[0034] Dissolving nano calcium hydroxide powder in ethanol to form a solution, and painting the prepared solution on ancient murals; the concentration range of nano calcium hydroxide dissolved in ethanol is 3-5mg / ml.

Embodiment 3

[0036] Under the condition of 24 degrees, dimethylformamide with a mass fraction of 8% was added to the calcium chloride solution and placed on a magnetic stirrer to stir for 5 minutes. Pour the stirred calcium chloride solution into the prepared sodium hydroxide solution to synthesize nano calcium hydroxide. Wherein the molar ratio of calcium chloride and sodium hydroxide is 1:2. The synthesized nano calcium hydroxide was washed 4 times with saturated lime water. After washing, dry at 55°C for 9 hours to obtain nanometer calcium hydroxide powder.

[0037] Test Results:

[0038] Anti-peel strength increased by 53%: Permeability: 1.9 minutes, artificial weathering resistance 1000 hours mural without any change.

[0039] Dissolving nano calcium hydroxide powder in ethanol to form a solution, and painting the prepared solution on ancient murals; the concentration range of nano calcium hydroxide dissolved in ethanol is 3-5mg / ml.

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Abstract

The invention relates to a preparing method of a nanometer calcium hydroxide powder material for fixing ancient murals. The preparing method comprises the steps of firstly dissolving calcium chlorideinto water, and afterwards, adding dimethyl formamide; mixing a calcium chloride aqueous solution with a sodium hydroxide aqueous solution to prepare nanometer calcium hydroxide. By means of the preparing method, heating is not needed, preparation is conducted at the normal temperature, and synthesized nanometer calcium hydroxide has high stability, and does not precipitate for 3 months in ethyl alcohol. The synthesis process is very simple, the time is saved, and it takes less than 1 h in the whole process. Besides, the method is low in synthesis cost, overcomes shortcomings of a current method of synthesizing nanometer calcium hydroxide, and has a very good industrial production prospect. As is shown by mural reinforcing experiments, the material is suitable for reinforcing the murals ofhumid burial chambers, and particularly well protects mural efflorescent and flaking of the murals. Compared with the prior art, the preparing process of the nanometer calcium hydroxide material is very simple, the time is saved, the preparation is controllable, and the cost is low. Besides, heating is not needed, preparation is conducted at the normal temperature, and energy consumption is low.

Description

technical field [0001] The invention belongs to the technical field of ancient mural protection materials, and relates to a preparation method of nanometer calcium hydroxide powder material used for strengthening ancient murals. Background technique [0002] Calcium hydroxide is a common chemical raw material, which is widely used in environmental protection, plastics, rubber, cement and other fields. In addition, it can also be used as a dechlorination agent, a desulfurization agent, and a neutralizing agent for soil acidification. [0003] Different from large-particle calcium hydroxide, nano-calcium hydroxide has the advantages of small particles and good permeability. In 2001, nano-calcium hydroxide was applied to repair the murals of brittle alkali, nail and other diseases (Langmuir 2001, 17, 4251-4255). Since then, the application of nano-calcium hydroxide in the protection of cultural relics has gradually attracted the attention of researchers. For example, better ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/02B82Y40/00B44D7/00
Inventor 李炫华朱金萌
Owner NORTHWESTERN POLYTECHNICAL UNIV
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