Color mixing and repairing material for red sandstone stone cultural relics and application thereof

Abstract

The invention discloses a toning repair material for red sandstone stone cultural relics and application of the toning repair material, and relates to the technical field of red sandstone stone repair. Aiming at the property and color change of the red sandstone, the cultural relic color-mixing repairing material obtained by blending the sintered material ginger nut, quartz sand, calcined kaolin, purple clay, medium tile ash and black gold sand as natural colored raw materials is natural in material and stable in color, and is not easy to discolor after being repaired in an outdoor environment for a long time; and the natural colored raw material and the repairing and shaping material or the natural raw stone have good binding force, so that the cultural relic toning and repairing material is relatively good in connection stability and not easy to fall off, and the risk of damage to the cultural relics due to repeated repairing of the cultural relics is reduced. Besides, by controlling the proportion of all the raw materials, multiple colors similar to the color of the red sandstone can be obtained through rapid modulation, the difficulty of toning and repairing of the red sandstone is reduced, a rapid compounding basis is provided for toning of the red sandstone, and the color of a repaired area is harmonious and unified with the color of surrounding raw stone.

Description

Technical Field

[0001] The invention relates to the technical field of red sandstone stone restoration, and in particular to a coloring restoration material for red sandstone stone cultural relics and application thereof. Background Art

[0002] Cultural relics are non-renewable resources, relics and remains with historical, artistic and scientific value left over from human social activities, and are precious cultural heritage of mankind. As my country attaches more and more importance to the protection of cultural relics, the protection of stone cultural relics such as grottoes, stone carvings, etc. has received more and more attention from the whole society.

[0003] Due to the special nature of its material, red sandstone-type stone cultural relics are widely found in my country's grotto temples and stone tablets and stone carvings, and most of them are preserved outdoors. Stone cultural relics are more susceptible to weathering, cracking, and incompleteness, which not only affect the safety and stability of cultural relics, but also cause inestimable losses to the various values ​​of the cultural relics themselves. Therefore, using safe and effective repair and shaping methods to protect and repair the above-mentioned types of diseases can maximize the local stability of cultural relics, thereby protecting the historical, artistic, and scientific value of cultural relics.

[0004] Due to the influence of physical and chemical factors during the process of rock formation, the same type of stone will have rich color changes in different locations (for example, different layers of red sandstone will have different color sedimentation rhythms). In addition, after the cultural relics are carved, they are kept in the open air for a long time, exposed to wind, snow, sun and rain, and the surface of the cultural relics will also have certain color changes (for example, the surface of the stone in the area that has been eroded by rain for a long time will become darker and yellower). Therefore, in the process of repairing red sandstone cultural relics, different repair areas of the same type of stone need to be allocated with repair materials of similar colors to achieve a coordinated and unified overall restoration effect of the cultural relics.

[0005] The current restoration method includes reshaping, shaping and coloring the area to be restored to ensure the overall restoration effect of the cultural relics is coordinated and unified. The existing coloring process mainly uses chemical synthetic pigments such as Chinese painting pigments and watercolor pigments for coloring. These materials have poor aging resistance under outdoor natural climate conditions. After a period of restoration, they are prone to discoloration or falling off, which is inconsistent with the color of the surrounding original stones, affecting the appreciation and protection of cultural relics. The area to be restored needs to be repaired repeatedly, which not only increases the cost of restoration, but also may cause irreversible damage to the cultural relics during each restoration process, which is not conducive to the protection of cultural relics.

[0006] In view of this, the present invention is proposed. Summary of the invention

[0007] The purpose of the present invention is to provide a color-adjusting and restoration material for red sandstone stone cultural relics and application thereof.

[0008] The present invention is achieved in that:

[0009] In a first aspect, the present invention provides a coloring and restoration material for red sandstone cultural relics. The cultural relic coloring and restoration material includes, by mass percentage, burned gravel: 5% to 45%, quartz sand: 0% to 50%, calcined kaolin: 0% to 25%, purple clay: 5% to 45%, medium tile ash: 0% to 50% and black gold sand: 0% to 50%.

[0010] The color value parameters of the burned granite include: L=74.5~75, a=4~5, b=14~15.

[0011] The color value parameters of quartz sand include: L=88~90, a=0.1~0.2, b=2.5~3.5.

[0012] The color parameters of calcined kaolin include: L=85.5-86.5, a=-3-3.5, b=-6.3-7.3.

[0013] The color value parameters of purple clay include: L=42~43, a=24.5~25, b=19~20.

[0014] The color value parameters of medium tile gray include: L=55.3~56.3, a=-0.13~1.13, b=4~5.

[0015] The color parameters of black gold sand include: L=32~33, a=3~4, b=-10~-11.

[0016] In a second aspect, the present invention provides an application of a material according to any one of the aforementioned embodiments in red sandstone-type stone restoration.

[0017] Preferably, the material application method comprises mixing the raw materials of the material with water in proportion and then applying the mixture to the surface of the red sandstone-like stone.

[0018] Preferably, the mass ratio of the raw material to water is 1:0.35-0.4.

[0019] The present invention has the following beneficial effects:

[0020] The present invention provides a coloring restoration material for red sandstone cultural relics and its application. According to the properties and color changes of red sandstone, the coloring restoration material for red sandstone cultural relics is obtained by mixing natural colored raw materials. The cultural relics coloring restoration material is natural, stable in color, and not easy to change color even in an open-air environment for a long time after restoration, and has good color stability; and the natural colored raw materials have good bonding force with the materials for repairing and patching or natural raw stones, so that the connection stability of the cultural relics coloring restoration material is better and not easy to fall off, reducing the risk of damage to cultural relics by repeated restoration of cultural relics. In addition, by controlling the proportion of each raw material, a variety of colors similar to the color of red sandstone can be quickly modulated, reducing the difficulty of coloring restoration of red sandstone, providing a basis for rapid compounding for coloring of red sandstone, realizing coloring restoration of red sandstone of different colors, and the color of the repaired area is harmonious and unified with the color of the surrounding raw stones. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 This is a color difference diagram of red sandstone in different locations;

[0023] Figure 2 This is a color difference diagram of red sandstone in different locations;

[0024] Figure 3 A color comparison diagram of the color-adjusting restoration material for red sandstone cultural relics provided in Example 1 of the present invention and the corresponding red sandstone original stone;

[0025] Figure 4 A color comparison diagram of the color-adjusting restoration material for red sandstone cultural relics provided in Example 8 of the present invention and the corresponding red sandstone original stone;

[0026] Figure 5 A color comparison diagram of the color-adjusting restoration material for red sandstone cultural relics provided in Example 9 of the present invention and the corresponding red sandstone original stone;

[0027] Figure 6 This is a comparison diagram before and after restoration of the color-adjusting restoration material for red sandstone stone cultural relics provided in Example 1 of the present invention. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention clearer, the technical scheme in the embodiments of the present invention will be described clearly and completely below. If the specific conditions are not specified in the embodiments, they are carried out according to conventional conditions or conditions recommended by the manufacturer. If the manufacturer of the reagents or instruments used is not specified, they are all conventional products that can be purchased commercially.

[0029] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0030] First of all, it should be noted that the color value parameters L, a and b mentioned in the present invention are color representation parameters in the CIELAB color space, which is a device-independent color space and is widely used in color theory and color difference calculation.

[0031] L stands for lightness, which indicates how light or dark a color is. L values ​​usually range from 0 (black) to 100 (white), with lower values ​​representing darker colors and higher values ​​representing lighter colors.

[0032] a represents the range from green to red, with positive values ​​indicating a tendency towards red and negative values ​​indicating a tendency towards green.

[0033] b represents the range from blue to yellow, with positive values ​​indicating yellowish color and negative values ​​indicating bluish color.

[0034] By controlling the values ​​of L, a and b of each substance (raw material or coloring and restoration material of red sandstone cultural relics), the color uniformity of each substance can be ensured; and the L, a and b parameters can be directly detected by equipment, such as using a spectrophotometer, and the detection method is simple and easy to obtain.

[0035] Since there are many caves, cliff statues and cliff carvings carved on sandstone intercalated with thin layers of mudstone and / or shale in China, accounting for more than 80% of the total number of caves in China. For example, the Leshan Giant Buddha in Sichuan is carved from the purple-red feldspar quartz sandstone of the Jiaguan Formation (K3p) of the Cretaceous System; the Beishan statues of the Dazu Rock Carvings in Chongqing are carved in the purple-gray to purple-red thick-layered massive mud and calcareous cemented feldspar quartz sandstone of the Penglai Town Formation (J3p) and Suining Formation (J3s) of the Upper Jurassic System; the Nanshi Grottoes Temple in Jingchuan, Gansu was carved in the purple-red mud-cemented feldspar quartz sandstone of the Cretaceous System; the Binxian Giant Buddha in Shaanxi was carved in the purple-red medium-coarse-grained sandstone of the Luohe Formation (K1z) of the Cretaceous System. Therefore, sandstone cultural relic rock materials are one of the most used rock types in China, and their restoration is of great significance.

[0036] The existing method for restoring red sandstone cultural relics uses organic pigments for color matching, which is prone to discoloration or falling off due to long-term exposure to the natural environment, affecting the overall coordination of the cultural relics, increasing the probability of repeated restoration, and increasing the risk of damage to the cultural relics. Therefore, the inventor proposes the following solution.

[0037] In a first aspect, the present invention provides a coloring and restoration material for red sandstone cultural relics. The cultural relic coloring and restoration material includes, by mass percentage, burned gravel: 5% to 45%, quartz sand: 0% to 50%, calcined kaolin: 0% to 25%, purple clay: 5% to 45%, medium tile ash: 0% to 50% and black gold sand: 0% to 50%.

[0038] By compounding with natural colored raw materials such as burnt gravel, quartz sand, calcined kaolin, purple clay, medium tile gray and black gold sand, the color stability of the cultural relic coloring and restoration materials is better, and it is not easy to change color even if it is placed in an open-air environment for a long time after restoration; and the natural colored raw materials have good bonding with the materials for repairing and patching or natural raw stones, so that the connection stability of the cultural relic coloring and restoration materials is better and it is not easy to fall off, reducing the risk of damage to the cultural relics caused by repeated restoration of cultural relics. In addition, by controlling the proportion of each raw material, a variety of colors similar to the color of red sandstone can be quickly adjusted, which reduces the difficulty of coloring and restoration of red sandstone, provides a basis for rapid compounding of red sandstone coloring, realizes the coloring and restoration of red sandstone of different colors, and the color of the repaired area is harmonious and unified with the surrounding raw stones.

[0039] The burnt gravel is the main cementitious material of the repair material and plays a bonding role. The content of the burnt gravel can be, for example, any value among 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40% or 45%, or a range between any two values.

[0040] In order to ensure the overall uniformity of the color of the red sandstone restoration materials, the color value parameters of the burned gravel include: L=74.5~75, a=4~5, b=14~15.

[0041] Quartz sand is a filling material of the repair material, which plays a role in reducing the shrinkage rate of the repair material. The content of quartz sand can be, for example, any value among 0%, 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45% or 50%, or a range value between any two values.

[0042] In order to ensure the overall uniformity of the color of the red sandstone stone cultural relics restoration materials, the color value parameters of quartz sand include: L = 88 ~ 90, a = 0.1 ~ 0.2, b = 2.5 ~ 3.5.

[0043] The function of calcined kaolin is to increase the plasticity of the repair material. The content of calcined kaolin can be, for example, any value among 0%, 2%, 4%, 6%, 8%, 10%, 12%, 14%, 16%, 18%, 20%, 22%, 24% or 25%, or a range value between any two values.

[0044] In order to ensure the overall color uniformity of the coloring and restoration materials for red sandstone cultural relics, the color value parameters of calcined kaolin include: L=85.5~86.5, a=-3~-3.5, b=-6.3~-7.3.

[0045] Purple clay is used as a red rock color to adjust the color of cultural relics coloring and restoration materials. When the color of the red sandstone original stone is reddish, the content of purple clay can be increased, otherwise the content of purple clay can be reduced. The content of purple clay can be, for example, any value of 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40% or 45%, or a range value between any two values. When the content of purple clay is too little, the red degree of the cultural relics coloring and restoration materials is low, and the overall color of the cultural relics coloring and restoration materials is greatly different from the color of red sandstone; when the content of purple clay is too much, the red degree of the cultural relics coloring and restoration materials increases, and the color is also greatly different from the color of red sandstone, affecting the color coordination of the restoration area and the surrounding original stone.

[0046] Specifically, in order to ensure that the purple clay is controlled within the above range to obtain a color that is coordinated and unified with the surrounding raw stones, the color value parameters of the purple clay include: L=42~43, a=24.5~25, b=19~20.

[0047] As a gray rock color, Zhongwa gray is used to adjust the color of cultural relics coloring and restoration materials, for example, the saturation of the color can be adjusted. At the same time, some natural red sandstone materials have grayish tones. In order to obtain cultural relics coloring and restoration materials of different colors, the content of Zhongwa gray can be adjusted between 0% and 50% according to the grayscale of the surrounding red sandstone raw stones. For example, it can be any value among 0%, 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45% or 50%, or a range value between any two values.

[0048] The higher the grayscale of the surrounding red sandstone raw stones, that is, the lower the saturation and brightness are, the more medium-gray tiles can be used; the lower the grayscale of the surrounding red sandstone raw stones, that is, the higher the saturation and brightness are, the less medium-gray tiles can be used. Even for areas where some red sandstone raw stones with brighter colors are located, medium-gray tiles can be omitted to adjust the color of the cultural relics coloring and restoration materials.

[0049] Specifically, in order to ensure that the medium gray tile is controlled within the above range to obtain a color that is coordinated and unified with the surrounding raw stones, the color value parameters of the medium gray tile include: L=55.3~56.3, a=-0.13~1.13, b=4~5.

[0050] Black gold sand is used as a black rock color to adjust the color of cultural relics coloring and restoration materials. For example, the darkness of the cultural relics coloring and restoration materials can be reduced to match the color of the surrounding red sandstone raw stones. Therefore, the content of black gold sand can be, for example, any value among 0%, 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45% or 50%, or a range value between any two values.

[0051] The darker the color of the surrounding red sandstone, the more black gold sand can be added; the brighter the color of the surrounding red sandstone, or the lighter the color, the less black gold sand can be added for color adjustment.

[0052] Specifically, in order to ensure that the black gold sand is controlled within the above range to obtain a color that is coordinated and unified with the surrounding raw stones, the color value parameters of the black gold sand include: L=32~33, a=3~4, b=-10~-11.

[0053] like Figure 1 and Figure 2 As shown, since the sedimentation process of rocks during diagenesis is not completely consistent, the color of red sandstone in different locations is different, and the cultural relics will also have certain color changes after being affected by long-term outdoor open-air environment (such as rain, snow, sun and other conditions). Therefore, for red sandstones of different colors, the present invention provides the following formula of cultural relic color adjustment and restoration materials.

[0054] The main color of red sandstone is red, and then according to the deposition method in different locations and the influence of the external environment, it presents other colors besides red. For example, the color of red sandstone can be red of different brightness, such as dark red, medium red and light pink; the red sandstone in some areas may have low saturation and grayish color, and there are also grayish dark red, grayish medium red and grayish light red; the red sandstone in some areas may appear yellowish, and there are also different colors such as yellowish dark red, yellowish medium red and yellowish light red; some areas may also have bluish light red. The following are the formulas of red sandstone of different colors and the color value parameters of the corresponding colors.

[0055] In an optional embodiment, when the cultural relics coloring and restoration material presents a dark red color, the composition of the material, calculated by mass percentage, includes burned gravel: 3% to 7%, calcined kaolin: 22% to 28%, purple clay: 18% to 22% and black gold sand: 48% to 50%; when the material presents a dark red color, the color value parameters of the material include L=53 to 58, a=2 to 3, and b=4 to 6.

[0056] Preferably, when the cultural relics coloring and restoration material presents a dark red color, the composition of the material, by mass percentage, includes burned gravel: 5%, calcined kaolin: 25%, purple clay: 20% and black gold sand: 50%; when the material presents a dark red color, the color value parameters of the material include L=55.5~56.5, a=2.2~2.5, b=4.8~5.5.

[0057] In an optional embodiment, when the cultural relics coloring and restoration material presents a medium red color, the composition of the material, by mass percentage, includes burned gravel: 3% to 7%, calcined kaolin: 22% to 28%, purple clay: 18% to 22%, black gold sand: 22% to 28% and quartz sand 22% to 28%; when the material presents a medium red color, the color value parameters of the material include L = 53 to 57, a = 3.5 to 4.5, b = 5.5 to 6.5.

[0058] Preferably, when the cultural relics coloring and restoration material presents a medium red color, the composition of the material, by mass percentage, includes burned gravel: 5%, calcined kaolin: 25%, purple clay: 20%, black gold sand: 25% and quartz sand 25%; when the material presents a medium red color, the color value parameters of the material include L=54.8~55.8, a=3.5~4, b=6~6.5.

[0059] In an optional embodiment, when the cultural relics coloring and restoration material appears pink, the composition of the material, calculated by mass percentage, includes burned gravel: 3% to 7%, calcined kaolin: 22% to 28%, purple clay: 18% to 22% and quartz sand 48% to 50%; when the material appears pink, the color value parameters of the material include L=65 to 68, a=8 to 9, b=9 to 10.

[0060] Preferably, when the cultural relics coloring and restoration material appears pink, the composition of the material, by mass percentage, includes burned gravel: 5%, calcined kaolin: 25%, purple clay: 20% and quartz sand 50%; when the material appears pink, the color value parameters of the material include L=65.5~66.8, a=8.2~8.5, b=9.2~9.7.

[0061] In an optional embodiment, when the cultural relics coloring and restoration material presents a grayish dark red color, the composition of the material, calculated by mass percentage, includes burned gravel: 3% to 7%, purple clay: 42% to 48% and medium tile gray: 48% to 50%; when the material presents a grayish dark red color, the color value parameters of the material include L=49 to 50, a=9 to 10, and b=10 to 11.

[0062] Preferably, when the cultural relics coloring and restoration material presents a grayish dark red color, the composition of the material, calculated by mass percentage, includes burned gravel: 5%, purple clay: 45% and medium tile gray: 50%; when the material presents a grayish dark red color, the color value parameters of the material include L=49.2~49.6, a=9.1~9.6, b=10.3~10.7.

[0063] In an optional embodiment, when the cultural relics coloring and restoration material presents a grayish red color, the composition of the material, calculated by mass percentage, includes burned gravel: 13% to 17%, calcined kaolin: 13% to 17%, purple clay: 18% to 22%, quartz sand: 35% to 40% and medium tile ash: 10% to 15%; when the material presents a grayish red color, the color value parameters of the material include L=63 to 65, a=7.5 to 8.5, and b=10 to 11.

[0064] Preferably, when the cultural relics coloring and restoration material presents a grayish red color, the composition of the material, calculated by mass percentage, includes burned gravel: 15%, calcined kaolin: 15%, purple clay: 20%, quartz sand: 37.5% and medium tile gray: 12.5%; when the material presents a grayish red color, the color value parameters of the material include L=63.5~64.5, a=7.8~8.2, b=10~10.5.

[0065] In an optional embodiment, when the cultural relics coloring and restoration material presents a grayish light red color, the composition of the material, calculated by mass percentage, includes burned gravel: 3% to 7%, purple clay: 42% to 48%, quartz sand: 42% to 48% and medium tile gray: 3% to 7%; when the material presents a grayish light red color, the color value parameters of the material include L=47 to 49, a=9 to 10, b=10 to 11.5.

[0066] Preferably, when the cultural relics coloring and restoration material presents a grayish light red color, the composition of the material, by mass percentage, includes burned gravel: 5%, purple clay: 45%, quartz sand: 45% and medium tile gray: 5%; when the material presents a grayish light red color, the color value parameters of the material include L=47.5~48.5, a=9.5~10, b=10.4~11.2.

[0067] In an optional embodiment, when the cultural relics coloring and restoration material presents a yellowish dark red color, the composition of the material, calculated by mass percentage, includes burned gravel: 35% to 40%, purple clay: 10% to 15%, black gold sand: 3% to 7% and quartz sand: 43% to 47%; when the material presents a yellowish dark red color, the color value parameters of the material include L=59 to 60, a=6 to 7, b=10 to 11.

[0068] Preferably, when the cultural relics coloring and restoration material presents a yellowish dark red color, the composition of the material, calculated by mass percentage, includes burned gravel: 37.5%, purple clay: 12.5%, black gold sand: 5% and quartz sand: 45%; when the material presents a yellowish dark red color, the color value parameters of the material include L=59.3~59.9, a=6.2~6.8, b=10~10.5.

[0069] In an optional embodiment, when the cultural relics coloring and restoration material presents a yellowish red color, the composition of the material, calculated by mass percentage, includes burned gravel: 23% to 27%, purple clay: 23% to 27%, quartz sand: 43% to 47% and medium tile ash: 3% to 7%; when the material presents a yellowish red color, the color value parameters of the material include L=58 to 59, a=9 to 10, and b=12 to 13.

[0070] Preferably, when the cultural relics coloring and restoration material presents a yellowish to medium red color, the composition of the material, by mass percentage, includes burned gravel: 25%, purple clay: 25%, quartz sand: 45% and medium tile ash: 5%; when the material presents a yellowish to medium red color, the color value parameters of the material include L=58.4~59, a=9.5~9.8, b=12~12.5.

[0071] In an optional embodiment, when the cultural relics coloring and restoration material appears yellowish light red, the composition of the material, calculated by mass percentage, includes burned gravel: 43% to 47%, purple clay: 3% to 7%, quartz sand: 32% to 38% and medium tile ash: 13% to 17%; when the material appears yellowish light red, the color value parameters of the material include L=67 to 69, a=4.5 to 5.5, and b=10 to 11.

[0072] Preferably, when the cultural relics coloring and restoration material presents a yellowish light red color, the composition of the material, calculated by mass percentage, includes burned gravel: 45%, purple clay: 5%, quartz sand: 35% and medium tile ash: 15%; when the material presents a yellowish light red color, the color value parameters of the material include L=67~68, a=5~5.5, b=10.3~10.9.

[0073] In an optional embodiment, when the cultural relics coloring and restoration material appears bluish-red, the composition of the material, calculated by mass percentage, includes burned gravel: 3% to 7%, calcined kaolin: 8% to 12%, purple clay: 33% to 37%, black gold sand: 10% to 15% and quartz sand 35% to 40%; when the material appears bluish-red, the color value parameters of the material include L=52 to 53, a=6.5 to 7.5, and b=8 to 9.

[0074] Preferably, when the cultural relics coloring and restoration material presents a bluish-red color, the composition of the material, calculated by mass percentage, includes burned gravel: 5%, calcined kaolin: 10%, purple clay: 35%, black gold sand: 12.5% ​​and quartz sand 37.5%; when the material presents a bluish-red color, the color value parameters of the material include L=52.3~52.8, a=6.8~7, b=8.1~8.7.

[0075] In an optional embodiment, the particle size of the quartz sand is 80-120 meshes, and the particle size of the black gold sand is 80-120 meshes. By controlling the particle sizes of the quartz sand and the black gold sand within the above range, the overall fineness of the material and the surrounding red sandstone raw stones can be coordinated and unified, and the tightness of the connection between the material and the supplementary material and / or the red sandstone raw stone can be ensured to prevent the material from falling off.

[0076] In a second aspect, the present invention provides an application of a material according to any one of the aforementioned embodiments in red sandstone-type stone restoration.

[0077] Preferably, the application method of the cultural relic coloring and restoration material includes mixing the raw materials of the material with water in proportion and then applying the mixture to the surface of the red sandstone-like stone.

[0078] Preferably, the mass ratio of the total mass of the raw materials of the cultural relics coloring and restoration material to water is 1:0.35-0.4.

[0079] The cultural relic coloring and restoration material provided by the present invention has natural raw materials and does not require any chemical additives. It only uses water as a mixing medium for the various raw materials and does not require high-temperature heating for consolidation and molding. It does not cause any physical or chemical damage to the cultural relic itself, and the material has strong compatibility and reversibility.

[0080] In some preferred embodiments, when the material provided by the present invention is applied to the restoration of red sandstone, it is only necessary to detect the color value parameters of the area to be restored, and then mix them according to the formula corresponding to the color value parameters provided by the present invention, so that a cultural relic coloring restoration material with uniform color can be quickly obtained, which reduces the difficulty of coloring, reduces the number of repeated color tests, and reduces the requirements for the restoration experience or professional knowledge of the restoration personnel, thereby ensuring the accuracy of the color restoration of cultural relics, while avoiding the increase in costs and the possibility of damage to cultural relics caused by repeated repairs.

[0081] Example 1

[0082] The present embodiment provides a coloring and restoration material for red sandstone cultural relics. The cultural relic coloring and restoration material includes, by mass percentage, 5% burned gravel, 25% calcined kaolin, 20% purple clay and 50% black gold sand, and can be used to repair deep red red sandstone raw stones.

[0083] Example 2

[0084] The present embodiment provides a coloring and restoration material for red sandstone cultural relics. The cultural relic coloring and restoration material includes, by mass percentage, 5% burned gravel, 25% calcined kaolin, 20% purple clay, 25% black gold sand and 25% quartz sand, and can be used to repair medium-red red sandstone raw stones.

[0085] Example 3

[0086] The present embodiment provides a coloring and restoration material for red sandstone cultural relics. The cultural relic coloring and restoration material includes, by mass percentage, 5% burned gravel, 25% calcined kaolin, 20% purple clay and 50% quartz sand, and can be used to repair red sandstone raw stones that are pink in color.

[0087] Example 4

[0088] The present embodiment provides a coloring and restoration material for red sandstone cultural relics. The cultural relic coloring and restoration material includes, by mass percentage, 5% burned grit, 45% purple clay and 50% medium tile ash, and can be used to repair grayish dark red red sandstone raw stones.

[0089] Example 5

[0090] The present embodiment provides a coloring and restoration material for red sandstone cultural relics. The cultural relic coloring and restoration material includes, by mass percentage, 15% burned gravel, 15% calcined kaolin, 20% purple clay, 37.5% quartz sand and 12.5% ​​medium tile ash. The material can be used to repair red sandstone raw stones that are grayish to red.

[0091] Example 6

[0092] The present embodiment provides a coloring and restoration material for red sandstone cultural relics. The cultural relic coloring and restoration material includes, by mass percentage, 5% burned grit, 45% purple clay, 45% quartz sand and 5% medium tile ash, and can be used to repair grayish light red red sandstone raw stones.

[0093] Example 7

[0094] The present embodiment provides a coloring and restoration material for red sandstone cultural relics. The cultural relic coloring and restoration material includes, by mass percentage, 37.5% burned grit, 12.5% ​​purple clay, 5% black gold sand and 45% quartz sand, and can be used to repair yellowish dark red red sandstone raw stones.

[0095] Example 8

[0096] The present embodiment provides a coloring and restoration material for red sandstone cultural relics. The cultural relic coloring and restoration material includes, by mass percentage, 25% burned grit, 25% purple clay, 45% quartz sand and 5% medium tile ash, and can be used to repair red sandstone raw stones with a yellowish to reddish color.

[0097] Example 9

[0098] The present embodiment provides a coloring and restoration material for red sandstone cultural relics. The cultural relic coloring and restoration material includes, by mass percentage, 45% burned grit, 5% purple clay, 35% quartz sand and 15% medium tile ash, and can be used to repair yellowish light red red sandstone raw stones.

[0099] Example 10

[0100] The present embodiment provides a coloring and restoration material for red sandstone cultural relics. The cultural relic coloring and restoration material includes, by mass percentage, 5% burned gravel, 10% calcined kaolin, 35% purple clay, 12.5% ​​black gold sand and 37.5% quartz sand, and can be used to repair red sandstone raw stones with a bluish-red color.

[0101] Test Example 1

[0102] The color-adjusting restoration material for red sandstone cultural relics provided in the above embodiment is applied to the restoration of red sandstone raw stones of corresponding colors, and the color value parameters of the red sandstone raw stones of corresponding colors are detected and recorded in Table 1.

[0103] The color restoration material for the red sandstone cultural relics of each embodiment was prepared into a cake-shaped sample block with a diameter of 2.5 cm and a thickness of 1 cm, and then the color value parameters of the sample block were detected and recorded in Table 1.

[0104] The sample block preparation method is: after mixing the raw materials of the coloring and restoration materials of the red sandstone stone cultural relics in proportion, add an equal mass of deionized water, stir thoroughly, and then prepare it into a cake-shaped sample block, and place the sample block in a cool and dry place to stand until it is fully dried.

[0105] The color value parameters were tested by a spectrophotometer, and the color value parameters of the red sandstone raw stone and the sample obtained by the test were compared, and the total color difference △E between the two was calculated according to the color space color difference calculation formula in the National Standard of the People's Republic of China - Uniform Color Space and Color Difference Formula "GB / T 7921-1997".

[0106] According to the color difference tolerance range of CIELAB color space:

[0107] ΔE<1: Imperceptible color difference, that is, it is difficult for the naked eye to distinguish the difference between the two colors.

[0108] 1≤ΔE<2: Slight color difference that can only be detected by careful observation.

[0109] 2≤ΔE<3.5: General color difference, which can be clearly seen by the naked eye.

[0110] ΔE ≥ 3.5: Significant color difference, very easy to detect, may have a significant impact on the appearance quality of the product.

[0111] Table 1 Color parameters of samples and red sandstone raw stone

[0112]

[0113]

[0114] As can be seen from Table 1, the samples prepared by the color adjustment and restoration materials for red sandstone cultural relics provided in Examples 1 to 10 of the present invention have a color difference of less than 1 with the original red sandstone stone, and there is no color difference when observed with the naked eye. The color is very coordinated with the color of the cultural relic itself, has good compatibility, and is suitable for the restoration of cultural relics.

[0115] The samples obtained in Examples 1 and 8-9 were placed together with the corresponding red sandstone raw stones and photographed and observed, and the following results were obtained: Figures 3 to 5 The results are shown. Figures 3 to 5 It can be seen that the sample block made by using the cultural relic coloring and restoration material provided by the embodiment of the present invention has almost no difference in color from the original red sandstone stone, and is suitable for cultural relic restoration.

[0116] Test Example 2

[0117] The coloring restoration material of the red sandstone cultural relic in Example 1 was applied to the deep red Qing Dynasty sandstone clamping rod stone for restoration, and the following Figure 6 Results shown.

[0118] Depend on Figure 6 It can be seen that the cultural relics color-adjusting and restoration material provided by the embodiment of the present invention is used for restoration, and the restored area is coordinated in color with the surrounding red sandstone original stone and has good compatibility.

[0119] Comparative Example 1

[0120] This comparative example provides a coloring and restoration material for red sandstone cultural relics. The cultural relic coloring and restoration material comprises, by mass percentage, 50% burned gravel, 6.5% terracotta, 3.5% carbon black and 40% quartz sand, and can be used to repair yellowish dark red red sandstone raw stones.

[0121] Comparative Example 2

[0122] This comparative example provides a coloring and restoration material for red sandstone cultural relics. The cultural relic coloring and restoration material comprises, by mass percentage, 50% burned gravel, 7% earth red, 40% quartz sand and 3% light gray. The material can be used to repair yellowish to reddish red sandstone raw stones.

[0123] Comparative Example 3

[0124] This comparative example provides a coloring and restoration material for red sandstone cultural relics. The cultural relic coloring and restoration material comprises, by mass percentage, 50% burned gravel, 2% earth red, 40% quartz sand and 8% light gray. The material can be used to repair yellowish and light red red sandstone raw stones.

[0125] Test Example 3

[0126] The cultural relic coloring and restoration materials provided in Comparative Examples 1 to 3 were prepared into cake-shaped samples of the same size according to the method of Experimental Example 1, and their color value parameters were tested, and the results shown in Table 2 were obtained.

[0127] Then, the samples of Comparative Examples 1 to 3 and Examples 7 to 9 were placed in a natural environment with high temperature, high humidity and abundant rain in summer and low temperature, low humidity and snowfall in winter, and aged for 365 days. The color parameters of the samples after the 365th day were tested and recorded in Table 2. The color parameters tested on the first day (the first day is the day for testing the color after the repair material is naturally dried) and after the 365th day were compared, and the ΔE color difference values ​​of the Examples and Comparative Examples after 365 days of outdoor natural cycle aging were calculated.

[0128] Table 2 Chromaticity parameters of samples of the embodiment and comparative example before and after natural aging

[0129]

[0130]

[0131] It can be seen from Table 2 that the cultural relic coloring and restoration material provided by the embodiment of the present invention has better durability, and has good color stability after long-term placement. Comparative Examples 1 to 3 use chemical synthetic pigments. Although the color difference in the initial stage is small compared with the red sandstone original stone, after long-term placement, the color changes significantly and the color difference increases. It is not suitable as a coloring restoration material for cultural relic restoration. It is easy to repeat the restoration of the cultural relic body, which increases the time and labor cost of restoring the cultural relic body and increases the risk of damage to the cultural relic.

[0132] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A coloring and restoration material for red sandstone cultural relics, characterized in that: The materials for coloring and restoration of cultural relics are calculated by mass percentage, including burnt gravel: 5% to 45%, quartz sand: 0% to 50%, calcined kaolin: 0% to 25%, purple clay: 5% to 45%, medium tile ash: 0% to 50% and black gold sand: 0% to 50%; The color value parameters of the burnt granite include: L=74.5-75, a=4-5, b=14-15; The color value parameters of the quartz sand include: L=88-90, a=0.1-0.2, b=2.5-3.5; The color parameters of the calcined kaolin include: L=85.5-86.5, a=-3-3.5, b=-6.3-7.3; The color value parameters of the purple clay include: L=42-43, a=24.5-25, b=19-20; The color value parameters of the medium tile gray include: L=55.3~56.3, a=-0.13~1.13, b=4~5; The color value parameters of the black gold sand include: L=32-33, a=3-4, b=-10--11.

2. The material according to claim 1, characterized in that When the material is dark red, the composition of the material, by mass percentage, includes burnt granite: 3% to 7%, calcined kaolin: 22% to 28%, purple clay: 18% to 22% and black gold sand: 48% to 50%; when the material is dark red, the color value parameters of the material include L=53 to 58, a=2 to 3, and b=4 to 6; Preferably, when the material presents a medium red color, the composition of the material, by mass percentage, includes burnt gravel: 3% to 7%, calcined kaolin: 22% to 28%, purple clay: 18% to 22%, black gold sand: 22% to 28% and quartz sand 22% to 28%; when the material presents a medium red color, the color value parameters of the material include L=53 to 57, a=3.5 to 4.5, b=5.5 to 6.5; Preferably, when the material is pink, the composition of the material, by mass percentage, includes burnt gravel: 3% to 7%, calcined kaolin: 22% to 28%, purple clay: 18% to 22% and quartz sand 48% to 50%; when the material is pink, the color value parameters of the material include L=65 to 68, a=8 to 9, b=9 to 10.

3. The material according to claim 2, characterized in that When the material is dark red, the composition of the material, by mass percentage, includes burnt granite: 5%, calcined kaolin: 25%, purple clay: 20% and black gold sand: 50%; when the material is dark red, the color value parameters of the material include L=55.5-56.5, a=2.2-2.5, b=4.8-5.5; Preferably, when the material presents a medium red color, the composition of the material, by mass percentage, includes burnt gravel: 5%, calcined kaolin: 25%, purple clay: 20%, black gold sand: 25% and quartz sand 25%; when the material presents a medium red color, the color value parameters of the material include L=54.8-55.8, a=3.5-4, b=6-6.5; Preferably, when the material is pinkish in color, the composition of the material, by mass percentage, includes burnt gravel: 5%, calcined kaolin: 25%, purple clay: 20% and quartz sand 50%; when the material is pinkish in color, the color value parameters of the material include L=65.5~66.8, a=8.2~8.5, b=9.2~9.

7.

4. The material according to claim 1, characterized in that When the material is grayish dark red, the composition of the material, by mass percentage, includes burnt granite: 3% to 7%, purple clay: 42% to 48% and medium tile gray: 48% to 50%; when the material is grayish dark red, the color value parameters of the material include L=49 to 50, a=9 to 10, and b=10 to 11; Preferably, when the material is grayish red, the composition of the material, by mass percentage, includes burnt gravel: 13% to 17%, calcined kaolin: 13% to 17%, purple clay: 18% to 22%, quartz sand: 35% to 40% and medium tile ash: 10% to 15%; when the material is grayish red, the color value parameters of the material include L=63 to 65, a=7.5 to 8.5, and b=10 to 11; Preferably, when the material is grayish red, the composition of the material, calculated by mass percentage, includes burnt gravel: 3% to 7%, purple clay: 42% to 48%, quartz sand: 42% to 48% and medium tile ash: 3% to 7%; when the material is grayish red, the color value parameters of the material include L=47 to 49, a=9 to 10, and b=10 to 11.

5.

5. The material according to claim 4, characterized in that When the material is grayish dark red, the composition of the material, by mass percentage, includes burnt grit: 5%, purple clay: 45% and medium tile gray: 50%; when the material is grayish dark red, the color value parameters of the material include L=49.2-49.6, a=9.1-9.6, b=10.3-10.7; Preferably, when the material is grayish red, the composition of the material, by mass percentage, includes burnt gravel: 15%, calcined kaolin: 15%, purple clay: 20%, quartz sand: 37.5% and medium tile ash: 12.5%; when the material is grayish red, the color value parameters of the material include L=63.5-64.5, a=7.8-8.2, b=10-10.5; Preferably, when the material is grayish red, the composition of the material, calculated by mass percentage, includes burnt gravel: 5%, purple clay: 45%, quartz sand: 45% and medium tile ash: 5%; when the material is grayish red, the color value parameters of the material include L=47.5~48.5, a=9.5~10, b=10.4~11.

2.

6. The material according to claim 1, characterized in that When the material is yellowish dark red, the composition of the material, by mass percentage, includes burnt granite: 35% to 40%, purple clay: 10% to 15%, black gold sand: 3% to 7% and quartz sand: 43% to 47%; when the material is yellowish dark red, the color value parameters of the material include L=59 to 60, a=6 to 7, and b=10 to 11; Preferably, when the material is yellowish to reddish, the composition of the material, by mass percentage, includes burnt granite: 23% to 27%, purple clay: 23% to 27%, quartz sand: 43% to 47% and medium tile ash: 3% to 7%; when the material is yellowish to reddish, the color value parameters of the material include L=58 to 59, a=9 to 10, and b=12 to 13; Preferably, when the material appears yellowish light red, the composition of the material, calculated by mass percentage, includes burnt gravel: 43% to 47%, purple clay: 3% to 7%, quartz sand: 32% to 38% and medium tile ash: 13% to 17%; when the material appears yellowish light red, the color value parameters of the material include L=67 to 69, a=4.5 to 5.5, and b=10 to 11.

7. The material according to claim 6, characterized in that When the material is yellowish dark red, the composition of the material, by mass percentage, includes burnt granite: 37.5%, purple clay: 12.5%, black gold sand: 5% and quartz sand: 45%; when the material is yellowish dark red, the color value parameters of the material include L=59.3-59.9, a=6.2-6.8, b=10-10.5; Preferably, when the material is yellowish to red, the composition of the material, by mass percentage, includes burnt granite: 25%, purple clay: 25%, quartz sand: 45% and medium tile ash: 5%; when the material is yellowish to red, the color value parameters of the material include L=58.4-59, a=9.5-9.8, b=12-12.5; Preferably, when the material appears yellowish light red, the composition of the material, calculated by mass percentage, includes burnt gravel: 45%, purple clay: 5%, quartz sand: 35% and medium tile ash: 15%; when the material appears yellowish light red, the color value parameters of the material include L=67~68, a=5~5.5, b=10.3~10.

9.

8. The material according to claim 1, characterized in that When the material is bluish-red, the composition of the material, by mass percentage, includes burnt granite: 3%-7%, calcined kaolin: 8%-12%, purple clay: 33%-37%, black gold sand: 10%-15% and quartz sand 35%-40%; when the material is bluish-red, the color value parameters of the material include L=52-53, a=6.5-7.5, b=8-9; Preferably, when the material appears bluish-red, the composition of the material, by mass percentage, includes burned gravel: 5%, calcined kaolin: 10%, purple clay: 35%, black gold sand: 12.5% ​​and quartz sand 37.5%; when the material appears bluish-red, the color value parameters of the material include L=52.3~52.8, a=6.8~7, b=8.1~8.

7.

9. The material according to any one of claims 2 to 8, characterized in that The particle size of the quartz sand is 80-120 meshes, and the particle size of the black gold sand is 80-120 meshes.

10. Use of the material according to any one of claims 1 to 9 in red sandstone stone repair; Preferably, the application method of the material comprises mixing the raw materials of the material with water in proportion and then applying the mixture to the surface of the red sandstone-like stone; Preferably, the mass ratio of the raw material of the material to water is 1:0.35-0.4.

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