Lead white lead return prevention and protection composition, application and prevention and protection method

Abstract

The invention belongs to the technical field of cultural relic protection, and relates to a lead white lead return prevention and protection composition, application and a prevention and protection method, and the lead white lead return prevention and protection composition comprises a type A prevention and protection solution and a type B prevention and protection solution; the A-type preventive protection liquid consists of phosphoric acid, phosphotungstic acid and an organic solvent; the B-type preventive protection liquid is prepared from barium hydroxide, ethyl cellulose and an organic solvent; the organic solvent is methanol, ethanol or acetone. The lead white lead return prevention and protection composition provided by the invention can effectively prevent lead return of the lead-containing white pigment in a high-concentration hydrogen sulfide environment, and the lead return disease is inhibited and prevented from the source; and the original pigment layer is effectively prevented from being damaged, and the operation risk is low.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of cultural relic protection, and relates to a lead white lead return prevention and protection composition, application and prevention and protection method, which is used for preventing and protecting lead white pigment from lead return disease in Chinese ancient building painting. BACKGROUND

[0002] The Chinese ancient building painting (referred to as painting) is very valuable to preserve, but because the lead white pigment is added in the painting, the lead white pigment is prone to react with hydrogen sulfide gas in the air or realgar and other sulfur-containing substances to generate black lead sulfide, so that the painting changes from white to black, which is called lead return disease, thereby being not conducive to the protection of the painting. Therefore, it is necessary to prevent the lead return disease.

[0003] At present, there is a lack of systematic prevention and protection technology for the lead return disease of the ancient building painting, and the lead return disease cannot be prevented from the source; therefore, most of the existing methods are to treat the lead return disease after it occurs. The treatment methods include local cleaning, chemical reduction or laser cleaning of lead return, and the like, and reference is made to the Chinese patent document with the publication number CN118341757A, which discloses a method for removing lead return of painting by using laser photodynamic; and reference is made to the ancient painting lead return removal method with the publication number CN103669112B. The current treatment method can remove the black lead return on the surface of the painting and restore the original appearance of the painting to a certain extent, but the use of oxidizing agents for local cleaning or laser cleaning will cause damage to the pigment layer, and the concentration of the oxidizing agent and the laser power are difficult to accurately control in the process of laser cleaning, and the operation risk is high. In addition, even after cleaning, the painting still has the risk of lead return disease occurring again.

[0004] Therefore, it is urgent to develop a long-acting lead return prevention method which can inhibit the occurrence of lead return disease from the source, will not cause damage to the pigment layer and has low operation risk. SUMMARY

[0005] In order to solve the technical problems that the lead return disease cannot be prevented from the source, the pigment layer is damaged and the operation risk is high in the background art, the application provides a lead white lead return prevention and protection composition, application and prevention and protection method.

[0006] The lead white lead return prevention and protection composition provided by the application includes a type A prevention and protection liquid and a type B prevention and protection liquid, can effectively prevent the lead white pigment from lead return in a high-concentration hydrogen sulfide environment, inhibit and prevent the occurrence of lead return disease from the source, and effectively avoid damage to the original pigment layer and has low operation risk.

[0007] In order to achieve the above purpose, the technical scheme adopted by the application is as follows:

[0008] A lead white lead return prevention protection composition, comprising a type A prevention protection liquid and a type B prevention protection liquid;

[0009] The type A prevention protection liquid is composed of phosphoric acid, phosphotungstic acid and an organic solvent; the type B prevention protection liquid is composed of barium hydroxide, ethyl cellulose and an organic solvent; the organic solvent is methanol, ethanol or acetone.

[0010] Further limited, the type A prevention protection liquid: 40g-70g of phosphoric acid and 10g-40g of phosphotungstic acid are added to 1000mL of the organic solvent.

[0011] Further limited, the preparation method of the type A prevention protection liquid is: phosphoric acid and phosphotungstic acid are sequentially added to the organic solvent, and stirring is performed until complete dissolution.

[0012] Further limited, the stirring condition is: the rotation speed is 200r / min-300r / min, and the time is 10-15 minutes.

[0013] Further limited, the type B prevention protection liquid: 2g-8g of barium hydroxide and 6g-12g of ethyl cellulose are added to 1000mL of the organic solvent.

[0014] Further limited, the preparation method of the type B prevention protection liquid is: barium hydroxide is first added to the organic solvent and stirred until uniform dispersion, and then ethyl cellulose is added to form a mixed system; and then the mixed system is subjected to a condensation reflux reaction in a hot water bath, and after the reaction is completed, the system is cooled to room temperature.

[0015] Further limited, the temperature of the hot water bath is 60±2℃; and the time of the condensation reflux reaction is 3h-4h.

[0016] Application of the lead white lead return prevention protection composition in lead return disease prevention protection.

[0017] Application of the lead white lead return prevention protection composition in Chinese ancient building color drawing lead return disease prevention protection.

[0018] A Chinese ancient building color drawing lead return disease prevention protection method, comprising the following steps:

[0019] S1, preparing the above-mentioned lead white lead return prevention protection composition;

[0020] S2, uniformly applying the type A prevention protection liquid on the surface of the Chinese ancient building color drawing; and using cold air to dry;

[0021] S3, continuously uniformly applying the type B prevention protection liquid on the surface of the Chinese ancient building color drawing after the drying in step S2; the application amount of the type B prevention protection liquid is greater than that of the type A prevention protection liquid; and then using cold air to dry, and the process is completed.

[0022] Compared with the prior art, the present application has the beneficial effects that:

[0023] 1、The present application forms the white lead return lead prevention and protection composition by the type A prevention and protection liquid and the type B prevention and protection liquid, can effectively prevent the phenomenon that the lead white pigment is prone to return lead disease in the high concentration hydrogen sulfide environment, inhibits and prevents the occurrence of the return lead disease from the source, has low operation risk, and will not cause damage to the pigment layer.

[0024] 2、The white lead return lead prevention and protection composition disclosed by the present application, raw materials of which are phosphoric acid, phosphotungstic acid, barium hydroxide, ethyl cellulose and organic solvent. These raw materials are coated on Chinese ancient building color drawing, can avoid disturbance to the original pigment layer, and effectively protect the original pigment layer.

[0025] 3、The white lead return lead prevention and protection composition disclosed by the present application contains two types of prevention and protection liquids, raw materials of which are safe and simple to prepare; meanwhile, only 'coating-cold air drying' is needed to complete the prevention and protection operation, the equipment requirement is low, the operation is simple, the risk is small, and the present application is safe and reliable. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 The macroscopic prevention and protection effect of the white lead pigment before and after the treatment of the white lead return lead prevention and protection composition disclosed by the present application;

[0027] Figure 2 The macroscopic prevention and protection effect of the white lead pigment treated by different operation sequences;

[0028] Figure 3 The macroscopic prevention and protection effect of the white lead pigment treated by different material compositions;

[0029] Figure 4 The visible light reflectance spectrum of the white lead pigment sample before and after the treatment of the present application after exposure in the hydrogen sulfide atmosphere;

[0030] Figure 5 The color difference of the wood block before and after the prevention and protection treatment of the present application. DETAILED DESCRIPTION

[0031] The present application will be further described in detail below in combination with the drawings and examples, but the embodiments of the present application are not limited thereto. Other methods for preparing the compounds of the present application are considered to be within the scope of the present application, according to some conventional modifications of the reaction conditions of the present application.

[0032] Unless otherwise defined, the technical terms or scientific terms used in the present application shall have the usual meanings understood by those skilled in the art to which the present application belongs.

[0033] It should also be understood that the specific embodiments described above are merely illustrative of the present application and that changes in the techniques and applications of the present application can be made by those skilled in the art without departing from the scope of the present application, which is defined by the following claims.

[0034] The present application provides a white lead return lead prevention and protection composition, comprising a type A prevention and protection liquid and a type B prevention and protection liquid.

[0035] In the present application, the type A prevention and protection liquid is composed of phosphoric acid, phosphotungstic acid and an organic solvent; the organic solvent is methanol, ethanol or acetone.

[0036] Preferably, 40g-70g of phosphoric acid and 10g-40g of phosphotungstic acid are added to 1000mL of the organic solvent.

[0037] In the present application, the preparation method of the type A prevention and protection liquid is: sequentially adding phosphoric acid and phosphotungstic acid into the organic solvent, and stirring until completely dissolved.

[0038] The stirring condition is: the rotation speed is 200r / min-300r / min, and the time is 10-15 minutes.

[0039] In the present application, the type B prevention and protection liquid is composed of barium hydroxide, ethyl cellulose and an organic solvent; the organic solvent is methanol, ethanol or acetone.

[0040] Preferably, 2g-8g of barium hydroxide and 6g-12g of ethyl cellulose are added to 1000mL of the organic solvent.

[0041] In the present application, the preparation method of the type B prevention and protection liquid is: first adding barium hydroxide into the organic solvent and stirring until uniformly dispersed, then adding ethyl cellulose to form a mixed system; and then performing a condensation reflux reaction on the mixed system in a hot water bath, and cooling to room temperature after the reaction is completed. The temperature of the hot water bath is 60±2℃; the time of the condensation reflux reaction is 3h-4h.

[0042] The type A prevention and protection liquid and the type B prevention and protection liquid used in the present application contain raw materials including phosphoric acid, phosphotungstic acid, barium hydroxide, ethyl cellulose and an organic solvent. The type A prevention and protection liquid can react with white lead pigments in situ to generate lead phosphotungstate; the subsequently coated type B prevention and protection liquid can not only neutralize the residual acid in the type A liquid, but also further react with the type A liquid to generate barium dihydrogen phosphate. Finally, the lead phosphotungstate and the barium dihydrogen phosphate jointly form a stable protective layer on the surface of the white lead pigments, thereby blocking the reaction of the white lead with hydrogen sulfide in the air and inhibiting the occurrence of the return lead phenomenon from the source.

[0043] The application also provides application of the lead white lead-returning prevention and protection composition in preventing lead-returning diseases.

[0044] The application also provides a lead-returning disease prevention and protection method for Chinese ancient building paintings, comprising the following steps:

[0045] S1, preparing the lead white lead-returning prevention and protection composition; specifically comprising a type A prevention and protection liquid and a type B prevention and protection liquid;

[0046] S2, uniformly applying the type A prevention and protection liquid on the surface of the Chinese ancient building painting first; and blowing dry with cold air; and blowing dry until the type A prevention and protection liquid applied on the surface of the Chinese ancient building painting is completely dried.

[0047] S3, continuously uniformly applying the type B prevention and protection liquid on the surface of the Chinese ancient building painting after the blowing dry in step S2; and blowing dry with cold air again, so as to complete the method; and blowing dry until the type B prevention and protection liquid applied on the surface of the Chinese ancient building painting is completely dried.

[0048] The above-mentioned technical solutions of the application are described in detail below by means of several specific examples.

[0049] It should be noted that, in the following examples, the reagents and chemical products used are all conventional products purchased from the market, unless otherwise specified.

[0050] It should be noted that, in the following examples, the operation or test method used is a conventional operation or a standard test method commonly used in the industry, unless otherwise specified; for example, if the temperature is not specified, the operation is performed at room temperature.

[0051] Example 1

[0052] The embodiment provides a lead white lead-returning prevention and protection composition, comprising a type A prevention and protection liquid and a type B prevention and protection liquid.

[0053] The type A prevention and protection liquid is composed of phosphoric acid, phosphotungstic acid and an organic solvent; and the organic solvent is ethanol. Preferably, 22 g of phosphoric acid is dissolved in 500 mL of ethanol, 6 g of phosphotungstic acid is further added, and stirring is performed at room temperature until complete dissolution, so as to obtain the type A prevention and protection liquid.

[0054] The type B prevention and protection liquid is composed of barium hydroxide, ethyl cellulose and an organic solvent; and the organic solvent is methanol. Preferably, 6 g of barium hydroxide is first added into 1000 mL of methanol and stirred until uniformly dispersed, and then 9.6 g of ethyl cellulose is added; subsequently, the obtained mixed system is placed in a 60±2℃ water bath for condensation reflux reaction for 4 hours, after the reaction is completed, the heating device is turned off and naturally cooled to room temperature, the reaction product is transferred into a brown glass reagent bottle and sealed for storage in the dark, so as to obtain the type B prevention and protection liquid.

[0055] Example 2

[0056] The present example provides a white lead return lead prevention protection composition, comprising a type A prevention protection liquid and a type B prevention protection liquid.

[0057] Preferably, 26 g of phosphoric acid is dissolved in 500 mL of ethanol, 8 g of phosphotungstic acid is continuously added, and stirring is continued until complete dissolution at room temperature to obtain the type A prevention protection liquid.

[0058] Preferably, 6 g of barium hydroxide is first added to 1000 mL of methanol and stirred until uniformly dispersed, and then 9.6 g of ethyl cellulose is added; subsequently, the obtained mixed system is placed in a 60±2°C water bath for condensation reflux reaction for 4 hours, after the reaction is completed, the heating device is turned off and naturally cooled to room temperature, and the reaction product is transferred into a brown glass reagent bottle for storage in the dark and sealed, which is the type B prevention protection liquid.

[0059] Example 3

[0060] The present example provides a white lead return lead prevention protection composition, comprising a type A prevention protection liquid and a type B prevention protection liquid.

[0061] 30 g of phosphoric acid is dissolved in 500 mL of ethanol, 10 g of phosphotungstic acid is continuously added, and stirring is continued until complete dissolution at room temperature to obtain the type A prevention protection liquid.

[0062] Preferably, 6 g of barium hydroxide is first added to 1000 mL of methanol and stirred until uniformly dispersed, and then 9.6 g of ethyl cellulose is added; subsequently, the obtained mixed system is placed in a 60±2°C water bath for condensation reflux reaction for 4 hours, after the reaction is completed, the heating device is turned off and naturally cooled to room temperature, and the reaction product is transferred into a brown glass reagent bottle for storage in the dark and sealed, which is the type B prevention protection liquid.

[0063] Example 4

[0064] The present example provides a white lead return lead prevention protection composition, comprising a type A prevention protection liquid and a type B prevention protection liquid.

[0065] 32 g of phosphoric acid is dissolved in 500 mL of ethanol, 12 g of phosphotungstic acid is continuously added, and stirring is continued until complete dissolution at room temperature to obtain the type A prevention protection liquid.

[0066] Preferably, 6 g of barium hydroxide is first added to 1000 mL of methanol and stirred until uniformly dispersed, and then 9.6 g of ethyl cellulose is added; subsequently, the obtained mixed system is placed in a 60±2°C water bath for condensation reflux reaction for 4 hours, after the reaction is completed, the heating device is turned off and naturally cooled to room temperature, and the reaction product is transferred into a brown glass reagent bottle for storage in the dark and sealed, which is the type B prevention protection liquid.

[0067] Example 5

[0068] The embodiment provides a Chinese ancient building color drawing lead return disease prevention and protection method, and comprises the following steps.

[0069] Firstly, the A-type prevention and protection liquid is uniformly coated on the surface of a sample to be prevented and protected; then, a hair dryer is used to blow dry the sample coated with the A-type prevention and protection liquid in a cold air mode until the A-type prevention and protection liquid is completely dried on the surface of the sample.

[0070] Then, the B-type prevention and protection liquid is uniformly coated on the surface of the sample, and the above-mentioned blowing dry operation of the hair dryer in the cold air mode is repeated until the B-type prevention and protection liquid is completely dried.

[0071] During the coating, the coating amount of the B-type prevention and protection liquid is greater than that of the A-type prevention and protection liquid; preferably, the B-type prevention and protection liquid is coated twice, and the A-type prevention and protection liquid is coated once.

[0072] The sample to be prevented and protected refers to Chinese ancient building color drawing to be prevented and protected; the A-type prevention and protection liquid and the B-type prevention and protection liquid are any one group in the embodiments 1 to 4.

[0073] Embodiment 6

[0074] The embodiment provides application of the lead white lead return prevention and protection composition in preventing Chinese ancient building color drawing lead return disease.

[0075] The specific process of the application of the embodiment is referred to the embodiment 5.

[0076] In order to verify the technical effect of the technical scheme of the embodiment, the lead white lead return prevention and protection composition prepared in the embodiment 3 is selected, the lead return prevention performance of the lead white pigment sample of the ancient building color drawing is verified according to the prevention and protection method of the embodiment 5, and the specific experimental verification is as follows.

[0077] Test 1

[0078] Hydrogen sulfide gas is the main factor leading to the lead white pigment lead return disease. In the experiment, hydrogen sulfide gas is generated by hydrolysis of a sodium sulfide solution to construct a high-concentration hydrogen sulfide environment to accelerate aging evaluation and protection effect.

[0079] The lead white pigment is uniformly coated on the surface of a standard 4cm*4cm solid wood block to prepare a lead white pigment sample, then the lead white lead return prevention and protection composition of the embodiment 3 is used to perform protection treatment according to the prevention and protection method of the embodiment 5; another unprotected lead white pigment sample is set as a control group. Then, the two lead white pigment samples are placed in a dryer, then a beaker containing 100ml of a 1mol / L sodium sulfide solution is placed in the dryer, and the dryer is sealed. After being placed at room temperature for 3 days, the aging is completed, and the lead white pigment sample is taken out.

[0080] As shown in Figure 1 The un-protected lead white pigment sample was exposed to a hydrogen sulfide atmosphere at a concentration much higher than that in the natural environment for 3 days, and significant discoloration occurred. The lead white pigment sample protected by the present application remained white and no visible discoloration occurred. This shows that the lead white re-lead prevention and protection composition and method provided by the present application has good ability to prevent lead white re-lead disease from occurring in ancient building color drawings, and can prevent lead re-lead phenomenon from the source.

[0081] Test 2

[0082] To verify the uniqueness of the prevention and protection method, a variety of combination experiments were carried out on the operation sequence and material composition of the two prevention and protection liquids.

[0083] The lead white pigment was uniformly coated on the surface of a standard 4cm x 4cm solid wood block to make a lead white pigment sample, and the lead white pigment sample was multiple.

[0084] The first group: only the A type prevention and protection liquid in example 3 was applied on the surface of the lead white pigment sample;

[0085] The second group: only the B type prevention and protection liquid in example 3 was applied on the surface of the lead white pigment sample;

[0086] The third group: the B type prevention and protection liquid in example 3 was first applied on the surface of the lead white pigment sample, and then the A type prevention and protection liquid in example 3 was applied and dried.

[0087] The fourth group: the A type prevention and protection liquid in example 3 was first applied on the surface of the lead white pigment sample, and then the B type prevention and protection liquid in example 3 (but the B type prevention and protection liquid did not contain barium hydroxide) was applied and dried.

[0088] The fifth group: the A type prevention and protection liquid in example 3 was first applied on the surface of the lead white pigment sample, and then the B type prevention and protection liquid in example 3 (but the B type prevention and protection liquid did not contain ethyl cellulose) was applied and dried.

[0089] The sixth group: the A type prevention and protection liquid in example 3 (but the A type prevention and protection liquid did not contain phosphoric acid) was first applied on the surface of the lead white pigment sample, and then the B type prevention and protection liquid in example 3 was applied and dried.

[0090] The seventh group: the A type prevention and protection liquid in example 3 (but the A type prevention and protection liquid did not contain phosphotungstic acid) was first applied on the surface of the lead white pigment sample, and then the B type prevention and protection liquid in example 3 was applied and dried.

[0091] Then, the above seven groups of white lead pigment samples are subjected to aging treatment. The aging treatment conditions are the same as those of Test 1. Comparison of the seven groups of white lead pigment samples before and after aging treatment shows that Figure 2 and Figure 3 as shown.

[0092] By comparing Figure 1 and Figure 2 it can be seen that: the operation of using A-type preventive protection liquid alone, B-type preventive protection liquid alone, and B-type preventive protection liquid first and then A-type preventive protection liquid, cannot achieve effective lead return prevention protection for the white lead pigment samples of ancient building color paintings.

[0093] By comparing Figure 1 and 3 it can be seen that: when one of the A-type preventive protection liquid or the B-type preventive protection liquid lacks a raw material, it cannot achieve effective lead return prevention protection for the white lead pigment samples of ancient building color paintings.

[0094] The above results show that, no matter whether only a part of the white lead return prevention protection composition of the present application is used, the order of protection steps is exchanged, or the operation is performed in the order specified under the condition of not completely using the materials specified in the present application, effective lead return prevention protection for the white lead pigment samples of ancient building color paintings cannot be achieved. Therefore, the white lead return prevention protection composition of the present application is used, and the operation order of applying A-type preventive protection liquid first and then B-type preventive protection liquid is followed, to effectively achieve the preventive protection effect against lead return disease.

[0095] Test 3

[0096] The white lead pigment samples made in Test 1 (not protected before aging) and the white lead pigment samples coated with the white lead return prevention protection composition of Example 3 (already protected before aging) are taken; then after being exposed in an atmosphere with hydrogen sulfide gas concentration much higher than the background value of natural environment for 3 days, the visible light reflectance spectrum changes are observed. The results are shown in Figure 4 .

[0097] The white lead pigment sample without protection treatment ( Figure 4 a), its visible light reflectance decreases sharply with exposure time, from the initial 60% to 25%; while the white lead pigment sample after preventive protection treatment of the present application ( Figure 4 b), its reflectance under visible light remains basically unchanged during the entire experimental period. The above results show that the technical solution adopted by the present application can effectively prevent the lead return phenomenon of white lead pigment paintings, and significantly enhance the self-protection ability of ancient building color white lead pigment in high-concentration hydrogen sulfide environment.

[0098] Test 4

[0099] In order to verify the color influence of the wood member of the building color drawing by the prevention and protection scheme of the present application, the colorimetry of the wood block before and after the treatment is determined.

[0100] Specifically, the white lead pigment is uniformly coated on the surface of the standard 4cm*4cm solid wood block to prepare the white lead pigment sample. The white lead pigment sample treated by the white lead re-lead prevention and protection composition of the present application according to the prevention and protection method of the present application is used as the experimental group; and the white lead pigment sample without protection is used as the control group. Subsequently, the two white lead pigment samples are subjected to the aging treatment according to the method of Test 1.

[0101] Then, the white lead pigment sample of the control group before aging, the white lead pigment sample of the control group after aging and the white lead pigment sample of the experimental group after aging and protection are taken as the test samples, and the color difference thereof is determined. When determining, five positions on each test sample are randomly selected for measurement, and the average value of the five measurement points is calculated. The results are shown in Table 1 and Figure 5 .

[0102] Table 1 Data of the experimental group and the control group before and after aging (ΔE)

[0103]

[0104] Note: In the table, "protection" refers to the re-lead prevention and protection treatment of the present application, and "aging" refers to the experimental conditions set in Test 1.

[0105] From Table 1 and Figure 5 , it can be seen that the color difference change of the wood block after the prevention and protection is similar to the color difference change caused by the uneven color of the wood block itself. It is shown that the prevention and protection composition and the prevention and protection method of the present application can effectively prevent the re-lead phenomenon of the white lead pigment in the Chinese ancient building color drawing, and will not cause the influence on the color of the wood member, avoid the disturbance to the original pigment layer, and the operation is safer.

[0106] It should be noted that: the re-lead prevention and protection composition of the present application is used to verify the prevention and protection of the re-lead phenomenon; when the white lead re-lead prevention and protection composition of Examples 1, 2 and 4, and other white lead re-lead prevention and protection compositions with other proportions within the scope of the present application are used for the prevention and protection of the Chinese ancient building color drawing, the same or similar treatment effects as Example 3 are also shown, the re-lead phenomenon is prevented from the source, the re-lead disease is prevented from occurring, the disturbance and damage to the original pigment layer are avoided, the influence on the color of the wood member is avoided, the operation is simple and safe, and the long-term prevention and protection is realized.

[0107] The above are several relatively preferred embodiments of the present application, but cannot be taken as a limitation on the technical solutions protected by the present application, and any alternative solution based on the technical idea of the present application and obtained by a person of ordinary skill in the art without making creative labor shall fall within the protection scope of the present application.

Claims

1. A white lead repulping prevention and protection composition characterized by comprising: The lead white lead-reversion prevention protection composition comprises an A-type prevention protection liquid and a B-type prevention protection liquid. The A-type prevention protection liquid is composed of phosphoric acid, phosphotungstic acid and an organic solvent; the B-type prevention protection liquid is composed of barium hydroxide, ethyl cellulose and an organic solvent; the organic solvent is methanol, ethanol or acetone.

2. The white lead reladning prevention protective composition according to claim 1, characterized by, The A-type prevention protection liquid comprises 40-70 g of phosphoric acid and 10-40 g of phosphotungstic acid in 1000 mL of the organic solvent.

3. The white lead reladning prevention protective composition according to claim 1, characterized by, The A-type prevention protection liquid is prepared by adding the phosphoric acid and the phosphotungstic acid into the organic solvent in sequence and stirring until completely dissolved.

4. The white lead reladning prevention protective composition according to claim 3, characterized by, The stirring is performed at a speed of 200-300 r / min for 10-15 minutes.

5. The white lead reladning prevention protective composition according to claim 1, characterized by, The B-type prevention protection liquid comprises 2-8 g of barium hydroxide and 6-12 g of ethyl cellulose in 1000 mL of the organic solvent.

6. The white lead reladning prevention protective composition according to claim 1, characterized by, The B-type prevention protection liquid is prepared by adding the barium hydroxide into the organic solvent and stirring until uniformly dispersed, then adding the ethyl cellulose to form a mixed system; the mixed system is subjected to a condensation reflux reaction in a hot water bath, and cooled to room temperature after the reaction.

7. The white lead reladning prevention protective composition according to claim 6, characterized by, The temperature of the hot water bath is 60±2℃, and the condensation reflux reaction is performed for 3-4 hours.

8. The use of the lead white lead-reversion prevention protection composition of claim 1 in the prevention and protection of lead-reversion diseases.

9. The use of the lead white lead-reversion prevention protection composition of claim 1 in the prevention and protection of lead-reversion diseases of Chinese ancient building paintings.

10. A method for preventing and protecting Chinese ancient building color drawing from lead disease, characterized in that, The method comprises the following steps: S1, preparing the lead white lead-reversion prevention protection composition of claim 1; S2, uniformly applying the A-type prevention protection liquid on the surface of the Chinese ancient building painting; and blowing dry with cold air; S3, uniformly applying the B-type prevention protection liquid on the surface of the Chinese ancient building painting after the blowing dry in step S2; the application amount of the B-type prevention protection liquid is greater than that of the A-type prevention protection liquid; and blowing dry with cold air again, thereby completing the method.

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