Toning and repairing material for tuff stone cultural relics and application of toning and repairing material

Abstract

The invention discloses a color matching and repairing material for tuff stone cultural relics and application of the color matching and repairing material, and relates to the technical field of tuff stone repairing. According to the property and color change of tuff, the sintered material ginger nut, quartz sand, kaolin, Chenban soil, red clay, fine tile ash, graphite powder and chlorite powder are adopted as natural mineral raw materials, and the obtained cultural relic color matching and repairing material is stable in color and not prone to discoloring after being repaired in an outdoor environment for a long time; and the natural mineral 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 that the cultural relics are damaged due to repeated repairing is reduced. Besides, by controlling the proportion of the raw materials, multiple colors similar to the color of the tuff stone can be obtained through rapid modulation, the difficulty of tuff stone toning and repairing is lowered, a rapid compounding basis is provided for tuff stone toning, and the color of the repaired area is harmonious and unified with the color of surrounding raw stone.

Description

Technical Field

[0001] The present invention relates to the technical field of tuff stone restoration, and in particular to a color-adjusting restoration material for tuff stone cultural relics and application thereof. Background Art

[0002] Tuff is a pyroclastic rock, primarily composed of over 50% volcanic debris less than 2mm in diameter. It varies in color and is widely distributed. Examples include the Wanfotang Grottoes in Yi County, Liaoning Province, the Nanshan Statues in Yuhang, Zhejiang Province, and most of the stone steles, platforms, and pedestals within the Chengde Mountain Resort and the Outer Eight Temples. However, tuff-based stone artifacts are prone to cracking, weathering, and damage in high-humidity and cold regions. This not only affects the safety and stability of the artifacts, but also causes immeasurable damage to their inherent value.

[0003] Because rocks are affected by physical and chemical factors during their diagenesis, the same type of stone can have rich color variations in different locations (for example, tuff can have light gray and dark gray, and pink blocky phenocrysts can appear in some areas). In addition, after the carving of cultural relics is completed, they are kept outdoors for a long time and are affected by wind, rain, snow and sunlight, which can cause the surface of the cultural relics to change color (for example, the surface of the stone in areas that have been eroded by rain for a long time will become darker or yellower). Therefore, during the restoration of tuff stone cultural relics, different restoration areas of the same type of stone need to be allocated with restoration materials of similar colors to achieve a coordinated and unified restoration effect for the overall cultural relics.

[0004] Current restoration methods involve reshaping, shaping, and coloring the area to be repaired to ensure a harmonious and uniform restoration effect. The existing coloring process primarily uses chemically synthesized pigments, such as traditional Chinese painting pigments and watercolors. These materials have poor aging resistance in outdoor natural climate conditions and are prone to discoloration or fading after a period of restoration. This creates a color discord with the surrounding original stone, affecting the appreciation and preservation of the artifact. This requires repeated repairs to the area to be repaired, increasing the cost of restoration and potentially causing irreversible damage to the artifact with each repair, which is detrimental to its preservation.

[0005] In view of this, the present invention is proposed. Summary of the Invention

[0006] The purpose of the present invention is to provide a color-adjusting and restoration material for tuff stone cultural relics and application thereof.

[0007] The present invention is achieved in that:

[0008] In a first aspect, the present invention provides a coloring and restoration material for tuff stone cultural relics. The cultural relic coloring and restoration material includes, by mass percentage, burned granite: 5% to 50%, quartz sand: 0% to 35%, kaolin: 0% to 37.5%, clay: 0% to 45%, red clay: 0% to 25%, fine tile ash: 0% to 30%, graphite powder: 15% to 50% and chlorite powder: 0% to 5%.

[0009] The color parameters of burned granite include: L=74~75, a=4~5, b=14~15.

[0010] The color parameters of quartz sand include: L=88~90, a=0.1~0.2, b=2.5~3.5.

[0011] The color parameters of kaolin include: L=90.5~91.5, a=0.2~0.5, b=2~3.

[0012] The color parameters of Chengban soil include: L=50~52, a=9~10, b=21~22.

[0013] The color parameters of red clay include: L=42~43, a=10~11, b=11~12.

[0014] The color value parameters of fine tile gray include: L=42~43, a=0.1~1.0, b=4~5.

[0015] The color parameters of graphite powder include: L=15-16, a=-1-2, b=-3-4.

[0016] The color parameters of chlorite powder include: L=58-59, a=-3-4, b=7-8.

[0017] In a second aspect, the present invention provides a use of a material according to any one of the aforementioned embodiments in the restoration of tuff-like stone.

[0018] Preferably, the application method of the material includes mixing the raw materials of the material with water in proportion and then applying the mixture to the surface of the tuff-like stone.

[0019] Preferably, the mass ratio of the raw material to water is 1:0.35-0.4.

[0020] The present invention has the following beneficial effects:

[0021] The present invention provides a color-adjusting and restoration material for tuff stone cultural relics and its application. In view of the properties and color changes of tuff, the color-adjusting and restoration material for tuff stone cultural relics is obtained by mixing natural mineral raw materials. The cultural relic color-adjusting and restoration material is natural and has stable color. It is not easy to change color even when exposed to the open air for a long time after restoration, and has good color stability. In addition, the natural mineral raw materials have good bonding strength with the restoration material or natural raw stone, so that the connection stability of the cultural relic color-adjusting and restoration material is good and it is not easy to fall off, thereby reducing the risk of damage to the cultural relic caused by repeated restoration of the cultural relic. In addition, by controlling the ratio of each raw material, a variety of colors similar to the color of the tuff stone can be quickly modulated, reducing the difficulty of color-adjusting and restoration of tuff stone, providing a basis for rapid compounding for tuff stone color-adjusting, realizing color-adjusting and restoration of tuff stone of different colors, and the color of the repaired area is harmonious and unified with the surrounding raw stone. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 This is a diagram showing the color differences of tuff at different locations;

[0024] Figure 2 A color comparison diagram of the color-adjusting restoration material for tuff stone cultural relics provided in Example 3 of the present invention and the corresponding tuff original stone;

[0025] Figure 3 A color comparison diagram of the color-adjusting restoration material for tuff stone cultural relics provided in Example 5 of the present invention and the corresponding tuff original stone;

[0026] Figure 4 A color comparison diagram of the color-adjusting restoration material for tuff stone cultural relics provided in Example 6 of the present invention and the corresponding tuff original stone;

[0027] Figure 5 Comparison diagram of the before and after restoration of the color-adjusting restoration material for tuff stone cultural relics provided in Example 3 of the present invention;

[0028] Figure 6 Comparison diagram of the before and after restoration of the color-adjusting restoration material for tuff stone cultural relics provided in Example 4 of the present invention;

[0029] Figure 7 This is a comparison diagram before and after restoration of the color-adjusting restoration material for tuff stone cultural relics provided in Example 5 of the present invention. DETAILED DESCRIPTION

[0030] To make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are described clearly and completely below. Where specific conditions are not specified in the embodiments, conventional conditions or conditions recommended by the manufacturer are used. Where the manufacturer of the reagents or instruments is not specified, all are conventional products that can be purchased commercially.

[0031] The features and performance of the present invention are further described in detail below with reference to the embodiments.

[0032] 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 widely used in color theory and color difference calculation.

[0033] L stands for lightness, which indicates how light or dark a color is. L values ​​typically range from 0 (black) to 100 (white), with lower values ​​representing darker colors and higher values ​​representing lighter colors.

[0034] a represents the range from green to red, with positive values ​​indicating a reddish color and negative values ​​indicating a greenish color.

[0035] b represents the range from blue to yellow, with positive values ​​indicating a yellowish color and negative values ​​indicating a bluish color.

[0036] By controlling the values ​​of L, a and b of each substance (raw material or coloring and restoration material for tuff stone 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.

[0037] In a first aspect, the present invention provides a coloring and restoration material for tuff stone cultural relics. The cultural relic coloring and restoration material includes, by mass percentage, burned granite: 5% to 50%, quartz sand: 0% to 35%, kaolin: 0% to 37.5%, clay: 0% to 45%, red clay: 0% to 25%, fine tile ash: 0% to 30%, graphite powder: 15% to 50% and chlorite powder: 0% to 5%.

[0038] By compounding natural mineral raw materials such as burned granite, quartz sand, kaolin, clay, red clay, fine tile ash, graphite powder, and chlorite powder, the resulting cultural relic coloring and restoration material has excellent color stability and is not prone to discoloration even after long-term exposure to the open air after restoration. Furthermore, the natural mineral raw materials have good bonding strength with the restoration materials or natural raw stones, making the connection stability of the cultural relic coloring and restoration material excellent and not prone to falling off, thus reducing the risk of damage to the cultural relic caused by repeated restoration. Furthermore, by controlling the proportions of the various raw materials, a variety of colors similar to the color of the tuff stone can be quickly adjusted, reducing the difficulty of coloring and restoration of the tuff stone, providing a basis for rapid compounding for tuff stone coloring, and achieving coloring and restoration of tuff stone of different colors. The color of the repaired area is harmonious and unified with the color of the surrounding raw stones.

[0039] Burnt gravel is the primary cementing material in restoration materials, acting as a bonding agent. Furthermore, burnt gravel exhibits a whitish-gray color, making it suitable for reducing the saturation of color-toned restoration materials. The burnt gravel content can be, for example, 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, or 50%, or a range between any two values.

[0040] In order to ensure the overall color uniformity of the color-tuning restoration materials for tuff stone cultural relics, the color value parameters of the burned gravel include: L=74~75, a=4~5, b=14~15.

[0041] Quartz sand is used as a filler in restoration materials, reducing their shrinkage. Furthermore, its near-white color can be used to adjust the color depth of restoration materials. The quartz sand content can be, for example, 0%, 5%, 10%, 15%, 20%, 25%, 30%, or 35%, or a range between any two values.

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

[0043] Kaolin increases the plasticity of restoration materials. Furthermore, its color is close to white, allowing it to adjust the color depth of restoration materials. The kaolin content can be, for example, 0%, 5%, 10%, 15%, 20%, 25%, 30%, 35%, or 37.5%, or any range between any two values.

[0044] In order to ensure the overall color uniformity of the coloring and restoration materials for tuff stone cultural relics, the color value parameters of kaolin include: L=90.5~91.5, a=0.2~0.5, b=2~3.

[0045] The main color of tuff is gray. In addition, there are some tuff stones that are yellowish, reddish or bluish. Therefore, in order to meet the color matching needs of tuff stones of different colors, it is necessary to use colorful natural mineral raw materials such as clarification clay, red clay, fine tile gray, graphite powder and chlorite powder to adjust the color, so as to ensure that the color of the cultural relics restoration materials is coordinated and unified with the surrounding tuff stones.

[0046] Chengban clay, a yellow rock pigment, is used to adjust the color of cultural relic restoration materials. It is particularly suitable for supplementing the color of yellowish tuff raw stones and also for supplementing the color of reddish tuff raw stones. The amount of Chengban clay added determines the yellowness of the overall color of the cultural relic restoration material, so the amount of Chengban clay added can be adjusted according to the color of the tuff raw stone. For example, the Chengban clay content can be any value among 0%, 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, or 45%, or a range between any two values.

[0047] Specifically, in order to ensure that the color of the Chengban soil is controlled within the above range and can be coordinated and unified with the surrounding raw stones, the color value parameters of the Chengban soil include: L=50~52, a=9~10, b=21~22.

[0048] Red clay, a red rock pigment, is used to adjust the color of cultural relic restoration materials. For example, it can be used to create a reddish hue to complement the surrounding tuff. However, the red clay content should not be too high, as this will prevent the overall color of the tuff from being too reddish. Therefore, the red clay content can be, for example, 0%, 5%, 10%, 15%, 20%, or 25%, or a range between any two values.

[0049] Specifically, in order to ensure that the red 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 red clay include: L=42~43, a=10~11, b=11~12.

[0050] Fine tile gray, a gray rock color, is used to adjust the color of cultural relic restoration materials, reducing their saturation. By varying the fine tile gray content, the grayscale of the materials can be adjusted. For example, the fine tile gray content can be any of 0%, 5%, 10%, 15%, 20%, 25%, or 30%, or a range between any two values.

[0051] The higher the grayness of the surrounding tuff raw stone, the more the content of fine tile ash can be increased; the lower the grayness of the surrounding tuff raw stone, for example, when it is white or yellowish, the content of fine tile ash can be reduced.

[0052] Specifically, in order to ensure that the fine tile gray 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 fine tile gray include: L=42~43, a=0.1~1.0, b=4~5.

[0053] Graphite powder, a black rock pigment, is used to adjust the color of cultural relic restoration materials. For example, it can reduce the darkness of the material to match the color of the surrounding tuff. Because tuff is often dark in color, a certain percentage of graphite powder is required for color matching. For example, the graphite powder content can be any of 15%, 20%, 25%, 30%, 35%, 40%, 45%, or 50%, or any range between any two values.

[0054] Specifically, in order to ensure that the graphite powder 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 graphite powder include: L=15~16, a=-1~-2, b=-3~-4.

[0055] Chlorite powder, a green rock pigment, is used to adjust the color of cultural relic restoration materials. When the tuff stone's color leans green or blue, the chlorite powder content can be increased; otherwise, the chlorite powder content can be reduced. The chlorite powder content can be, for example, 0%, 1%, 2%, 3%, 4%, or 5%, or a range between any two values.

[0056] Specifically, in order to ensure that the chlorite powder 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 chlorite powder include: L=58~59, a=-3~-4, b=7~8.

[0057] like Figure 1 As shown, due to the uneven sedimentation process during diagenesis, tuff has different colors in different locations, for example, some areas are yellowish or white. Furthermore, cultural relics will also experience some color changes after long-term exposure to outdoor environments (such as rain, snow, and sunlight). Therefore, the present invention provides the following formula for cultural relic coloring and restoration materials for tuff of different colors.

[0058] Because the color adjustment process is relatively complex, the way the color changes after adding raw materials of different colors is not uniquely determined. The original tuff stone mainly appears gray, and then, depending on the deposition method in different locations and the influence of the external environment, it will show other colors besides gray. For example, the color of the original tuff stone can be gray of different brightness, such as dark gray, medium gray and light gray; the original tuff stone in some areas may also have some yellow tones on the basis of gray, so it is also divided into dark gray with yellow, medium gray with yellow and light gray with yellow; the original tuff stone in some other areas may appear reddish, white or bluish. The following is the formula of the color adjustment and restoration materials for tuff stone cultural relics of different colors and the color value parameters of their corresponding colors.

[0059] In an optional embodiment, when the cultural relics coloring and restoration material appears dark gray, the composition of the material, calculated by mass percentage, includes burned gravel: 43% to 47%, kaolin: 3% to 7%, fine tile ash: 8% to 12% and graphite powder: 38% to 42%; when the material appears dark gray, the color value parameters of the material include L = 50 to 53, a = 1 to 2, b = 4 to 5.

[0060] Preferably, when the cultural relic coloring and restoration material appears dark gray, the composition of the material, calculated by mass percentage, includes burned gravel: 45%, kaolin: 5%, fine tile ash: 10% and graphite powder: 40%; when the material appears dark gray, the color value parameters of the material include L=51~52, a=1.5~2, b=4.2~4.8.

[0061] In an optional embodiment, when the cultural relics color restoration material presents a medium gray, the composition of the material, calculated by mass percentage, includes burned gravel: 43% to 47%, kaolin: 3% to 7%, fine tile ash: 25% to 30% and graphite powder: 18% to 22%; when the material presents a medium gray, the color value parameters of the material include L = 55 to 58, a = 1 to 2, b = 5 to 6.

[0062] Preferably, when the cultural relic coloring and restoration material presents a medium gray, the composition of the material, calculated by mass percentage, includes burned gravel: 45%, kaolin: 5%, fine tile ash: 30% and graphite powder: 20%; when the material presents a medium gray, the color value parameters of the material include L=56~57, a=1.5~2, b=5.4~6.

[0063] In an optional embodiment, when the cultural relics coloring and restoration material appears light gray, the composition of the material, calculated by mass percentage, includes burned gravel: 45% to 50%, quartz sand: 3% to 7%, fine tile ash: 25% to 30% and graphite powder: 15% to 20%; when the material appears light gray, the color value parameters of the material include L = 59 to 61, a = 1 to 3, b = 5 to 6.5.

[0064] Preferably, when the cultural relic coloring and restoration material appears light gray, the composition of the material, calculated by mass percentage, includes burned gravel: 50%, quartz sand: 5%, fine tile ash: 30% and graphite powder: 15%; when the material appears light gray, the color value parameters of the material include L=59~60, a=1.5~2.5, b=5.5~6.

[0065] In an optional embodiment, when the cultural relics coloring and restoration material appears dark gray with a yellowish tint, the composition of the material, calculated by mass percentage, includes burned gravel: 22% to 28%, quartz sand: 12% to 18%, clay: 22% to 28% and graphite powder: 32% to 38%; when the material appears dark gray with a yellowish tint, the color value parameters of the material include L = 50 to 52, a = 2 to 3, and b = 6 to 7.

[0066] Preferably, when the cultural relic coloring and restoration material appears dark gray with a yellowish tint, the composition of the material, calculated by mass percentage, includes burned gravel: 25%, clay: 25%, quartz sand: 15% and graphite powder: 35%; when the material appears dark gray with a yellowish tint, the color value parameters of the material include L=50.5~51.5, a=2.4~2.8, b=6.5~7.

[0067] In an optional embodiment, when the cultural relic coloring and restoration material presents a medium gray with a yellowish tint, the composition of the material, calculated by mass percentage, includes burned gravel: 10% to 15%, quartz sand: 28% to 32%, clay: 35% to 40% and graphite powder: 18% to 22%; when the material presents a medium gray with a yellowish tint, the color value parameters of the material include L = 46 to 49, a = 3 to 4.5, and b = 9 to 11.

[0068] Preferably, when the cultural relic coloring and restoration material presents a medium gray with a yellowish color, the composition of the material, calculated by mass percentage, includes burned gravel: 12.5%, clay: 37.5%, quartz sand: 30% and graphite powder: 20%; when the material presents a medium gray with a yellowish color, the color value parameters of the material include L=47~48, a=3.5~4.5, b=9.5~10.5.

[0069] In an optional embodiment, when the cultural relic coloring and restoration material appears light gray with a yellowish tint, the composition of the material, calculated by mass percentage, includes burned gravel: 5% to 10%, quartz sand: 30% to 35%, clay: 40% to 45% and graphite powder: 15% to 20%; when the material appears light gray with a yellowish tint, the color value parameters of the material include L = 45 to 48, a = 3 to 4, b = 8 to 9.5.

[0070] Preferably, when the cultural relic coloring and restoration material appears light gray with a yellowish tint, the composition of the material, calculated by mass percentage, includes burned gravel: 5%, clay: 45%, quartz sand: 35% and graphite powder: 15%; when the material appears light gray with a yellowish tint, the color value parameters of the material include L=46~47, a=3.2~3.8, b=8.5~9.

[0071] In an optional embodiment, when the cultural relic color restoration material appears reddish, the composition of the material, calculated by mass percentage, includes burned gravel: 25% to 30%, red clay: 20% to 25% and graphite powder: 45% to 50%; when the material appears reddish, the color value parameters of the material include L = 43 to 46, a = 4 to 5, and b = 6 to 7.

[0072] Preferably, when the cultural relic color restoration material appears reddish, the composition of the material, calculated by mass percentage, includes burned gravel: 25%, red clay: 25% and graphite powder: 50%; when the material appears reddish, the color value parameters of the material include L=44~45, a=4~4.8, b=6.5~7.

[0073] In an optional embodiment, when the cultural relics color restoration material appears whitish, the composition of the material, calculated by mass percentage, includes burned gravel: 22% to 28%, quartz sand: 18% to 22%, kaolin: 22% to 28%, fine tile ash: 8% to 12% and graphite powder: 18% to 22%; when the material appears whitish, the color value parameters of the material include L = 56 to 58, a = 1.5 to 2.5, b = 4.5 to 5.5.

[0074] Preferably, when the cultural relics color restoration material appears whitish, the composition of the material, calculated by mass percentage, includes burned gravel: 25%, kaolin: 25%, quartz sand: 20, fine tile ash: 10% and graphite powder: 20%; when the material appears whitish, the color value parameters of the material include L=56.5~57.5, a=1.8~2.2, b=4.8~5.2.

[0075] In an optional embodiment, when the cultural relics coloring and restoration material presents a dark bluish-gray color, the composition of the material, calculated by mass percentage, includes burned gravel: 22% to 28%, kaolin: 22% to 28%, fine tile ash: 22% to 28%, graphite powder: 18% to 22% and chlorite powder: 3% to 5%; when the material presents a dark bluish-gray color, the color value parameters of the material include L = 56 to 59, a = 1 to 2, b = 3.5 to 4.5.

[0076] Preferably, when the cultural relic coloring and restoration material presents a dark bluish-gray color, the composition of the material, calculated by mass percentage, includes burned gravel: 25%, kaolin: 25%, chlorite powder: 5%, fine tile ash: 25% and graphite powder: 20%; when the material presents a dark bluish-gray color, the color value parameters of the material include L=57~58, a=1~1.5, b=3.5~4.2.

[0077] In an optional embodiment, when the cultural relic coloring and restoration material presents a light bluish-gray color, the composition of the material, calculated by mass percentage, includes burned gravel: 10% to 15%, kaolin: 33% to 37.5%, fine tile ash: 18% to 22%, graphite powder: 22% to 28% and chlorite powder: 3% to 5%; when the material presents a light bluish-gray color, the color value parameters of the material include L = 59 to 62, a = 0.5 to 1.5, and b = 3 to 4.

[0078] Preferably, when the cultural relic coloring and restoration material presents a light bluish-gray color, the composition of the material, calculated by mass percentage, includes burned gravel: 12.5%, kaolin: 37.5%, chlorite powder: 5%, fine tile ash: 20% and graphite powder: 25%; when the material presents a light bluish-gray color, the color value parameters of the material include L=60~61, a=0.5~1, b=3.2~3.8.

[0079] In an optional embodiment, the quartz sand has a particle size of 150-200 mesh. By controlling the particle size of the quartz sand within this range, the overall fineness of the material can be coordinated and unified with the surrounding tuff rock, and the tight connection between the material and the filler material and / or the tuff rock can be ensured, preventing the material from falling off.

[0080] In a second aspect, the present invention provides a use of a material according to any one of the aforementioned embodiments in the restoration of tuff-like stone.

[0081] 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 tuff-like stone.

[0082] 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.

[0083] 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.

[0084] In some preferred embodiments, when the materials provided by the present invention are applied to the restoration of tuff-type stones, it is only necessary to detect the color value parameters of the area to be repaired, and then to prepare them according to the formula corresponding to the color value parameters provided by the present invention. 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 trials, 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 and avoiding the increase in costs and the possibility of damage to cultural relics caused by repeated repairs.

[0085] Example 1

[0086] This embodiment provides a coloring and restoration material for tuff stone cultural relics. The cultural relic coloring and restoration material includes, by mass percentage, burned granite: 45%, kaolin: 5%, fine tile ash: 10% and graphite powder: 40%, and can be used to repair dark gray tuff original stone.

[0087] Example 2

[0088] This embodiment provides a coloring and restoration material for tuff stone cultural relics. The cultural relic coloring and restoration material includes, by mass percentage, burned gravel: 45%, kaolin: 5%, fine tile ash: 30% and graphite powder: 20%, and can be used to repair medium-gray tuff raw stones.

[0089] Example 3

[0090] This embodiment provides a coloring and restoration material for tuff stone cultural relics. The cultural relic coloring and restoration material includes, by mass percentage, burned granite: 50%, quartz sand: 5%, fine tile ash: 30% and graphite powder: 15%, and can be used to repair light gray tuff original stone.

[0091] Example 4

[0092] This embodiment provides a coloring and restoration material for tuff stone cultural relics. The cultural relic coloring and restoration material includes, by mass percentage, burned granite: 25%, clay: 25%, quartz sand: 15% and graphite powder: 35%, and can be used to repair dark gray and yellowish tuff raw stones.

[0093] Example 5

[0094] This embodiment provides a coloring and restoration material for tuff stone cultural relics. The cultural relic coloring and restoration material includes, by mass percentage, burned granite: 12.5%, clay: 37.5%, quartz sand: 30% and graphite powder: 20%, and can be used to repair medium-gray and yellowish tuff raw stones.

[0095] Example 6

[0096] This embodiment provides a coloring and restoration material for tuff stone cultural relics. The cultural relic coloring and restoration material includes, by mass percentage, burned granite: 5%, clay: 45%, quartz sand: 35% and graphite powder: 15%, and can be used to repair light gray and yellowish tuff raw stones.

[0097] Example 7

[0098] This embodiment provides a color-adjusting and restoration material for tuff stone cultural relics. The cultural relic color-adjusting and restoration material comprises, by mass percentage, 25% burned granite, 25% red clay, and 50% graphite powder. The material can be used to repair reddish tuff raw stones.

[0099] Example 8

[0100] This embodiment provides a coloring and restoration material for tuff stone cultural relics. The cultural relic coloring and restoration material includes, by mass percentage, burned gravel: 25%, kaolin: 25%, quartz sand: 20%, fine tile ash: 10% and graphite powder: 20%, which can be used to repair white tuff raw stones.

[0101] Example 9

[0102] This embodiment provides a coloring and restoration material for tuff stone cultural relics. The cultural relic coloring and restoration material includes, by mass percentage, burned granite: 25%, kaolin: 25%, chlorite powder: 5%, fine ash: 25% and graphite powder: 20%, and can be used to repair dark blue-gray tuff raw stones.

[0103] Example 10

[0104] This embodiment provides a coloring and restoration material for tuff stone cultural relics. The cultural relic coloring and restoration material includes, by mass percentage, burned granite: 12.5%, kaolin: 37.5%, chlorite powder: 5%, fine ash: 20% and graphite powder: 25%, which can be used to repair light blue-gray tuff raw stones.

[0105] Test Example 1

[0106] The color-adjusting restoration material for tuff stone cultural relics provided in the above embodiment is applied to the restoration of tuff original stones of corresponding colors, and the color value parameters of the tuff original stones of corresponding colors are detected and recorded in Table 1.

[0107] The color restoration materials for the tuff stone cultural relics of each embodiment were prepared into cake-shaped samples with a diameter of 2.5 cm and a thickness of 1 cm. The color value parameters of the samples were then tested and recorded in Table 1.

[0108] The sample preparation method is: after mixing the raw materials of the coloring and restoration materials of tuff stone cultural relics in proportion, add an equal mass of deionized water, stir thoroughly, and then prepare it into a cake-shaped sample, and place the sample in a cool and dry place to stand until it is fully dried.

[0109] The color parameters were tested by a spectrophotometer, and the color parameters of the tuff raw stone and the sample obtained were compared. 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".

[0110] According to the color difference tolerance range of CIELAB color space:

[0111] ΔE<1: Imperceptible color difference, that is, the difference between the two colors is difficult to distinguish with the naked eye.

[0112] 1≤ΔE<2: Slight color difference, detectable only through careful observation.

[0113] 2≤ΔE<3.5: General color difference, clearly noticeable to the naked eye.

[0114] ΔE ≥ 3.5: Significant color difference, very easy to detect, may have a significant impact on the product's appearance quality.

[0115] Table 1 Color parameters of sample blocks and tuff raw stones

[0116]

[0117]

[0118] As can be seen from Table 1, the sample blocks prepared by the color-adjusting restoration materials for tuff stone cultural relics provided in Examples 1 to 10 of the present invention have a color difference of less than 1 with respect to the original tuff stone, and there is no color difference when observed with the naked eye. The sample blocks are very coordinated with the color of the cultural relic itself, have good compatibility, and are suitable for the restoration of cultural relics.

[0119] The samples obtained in Examples 3, 5 and 6 were placed together with the corresponding tuff raw stones and photographed and observed, and the following results were obtained: Figures 2-4 The results are shown. Figures 2-4 It can be seen that the sample blocks made using the cultural relic color-adjusting restoration material provided by the embodiment of the present invention have almost no difference in color from the original tuff stone, and are suitable for cultural relic restoration.

[0120] Test Example 2

[0121] The color-adjusting restoration materials for tuff stone cultural relics provided in Examples 3 to 5 were applied to the restoration of light gray, dark gray with a yellowish tint, and medium gray with a yellowish tint of the Qing Dynasty tuff stone Xumi pedestal. Figures 5-7 Results shown.

[0122] Depend on Figures 5-7 It can be seen that after the restoration is carried out using the cultural relic color-adjusting restoration material provided by the embodiment of the present invention, the cracks disappear, and the area near the cracks is coordinated in color with the surrounding tuff original stone, and has good compatibility with the cultural relic itself.

[0123] Comparative Example 1

[0124] This comparative example provides a coloring and restoration material for tuff stone cultural relics. The cultural relic coloring and restoration material includes, by mass percentage, burned granite: 50%, quartz sand: 40%, titanium dioxide: 1%, light gray: 3% and carbon black: 6%, and can be used to repair dark gray tuff original stone.

[0125] Comparative Example 2

[0126] This comparative example provides a coloring and restoration material for tuff stone cultural relics. The cultural relic coloring and restoration material includes, by mass percentage, burned granite: 50%, quartz sand: 40%, titanium dioxide: 1%, light gray: 5% and carbon black: 4%. It can be used to repair medium-gray tuff raw stones.

[0127] Comparative Example 3

[0128] This comparative example provides a coloring and restoration material for tuff stone cultural relics. The cultural relic coloring and restoration material includes, by mass percentage, burned granite: 50%, quartz sand: 40%, titanium dioxide: 2%, light gray: 7% and carbon black: 1%, and can be used to repair light gray tuff original stone.

[0129] Test Example 3

[0130] The cultural relics 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.

[0131] The samples from Comparative Examples 1-3 and Examples 1-3 were then placed in a natural environment characterized by high temperature, high humidity, and abundant rainfall in the summer, and low temperature, low humidity, and snowfall in the winter. The samples were then aged for 365 days. The color parameters of the samples after the 365th day were then measured and recorded in Table 2. The color parameters measured on day 1 (day 1 being the day the color was measured after the repair material had naturally dried) and after the 365th day were compared to calculate the ΔE color difference between the Examples and Comparative Examples after 365 days of outdoor aging.

[0132] Table 2 Chromaticity parameters of samples of the embodiment and comparative example before and after natural aging

[0133]

[0134]

[0135] As can be seen from Table 2, the cultural relic coloring and restoration material provided by the embodiment of the present invention has better durability and good color stability after long-term storage. Comparative Examples 1 to 3 use chemical synthetic pigments. Although the color difference in the initial stage is small compared with the tuff original stone, after long-term storage, the color changes significantly and the color difference increases. It is not suitable to be used as a coloring and 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.

[0136] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A coloring and repairing material for tuff stone cultural relics, characterized in that: The materials for coloring and restoration of cultural relics are calculated by mass percentage, including burnt gravel: 5% to 50%, quartz sand: 0% to 35%, kaolin: 0% to 37.5%, Chengban clay: 0% to 45%, red clay: 0% to 25%, fine tile ash: 0% to 30%, graphite powder: 15% to 50% and chlorite powder: 0% to 5%; The color value parameters of the burnt granite include: L=74-75, 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 kaolin include: L=90.5-91.5, a=0.2-0.5, b=2-3; The color value parameters of the Chengban soil include: L=50-52, a=9-10, b=21-22; The color parameters of the red clay include: L=42-43, a=10-11, b=11-12; The color value parameters of the fine tile gray include: L=42-43, a=0.1-1.0, b=4-5; The color parameters of the graphite powder include: L=15-16, a=-1-2, b=-3-4; The color value parameters of the chlorite powder include: L=58-59, a=-3-4, b=7-8.

2. The material according to claim 1, characterized in that When the material is dark gray, the composition of the material, by mass percentage, includes burnt ash: 43% to 47%, kaolin: 3% to 7%, fine tile ash: 8% to 12% and graphite powder: 38% to 42%; when the material is dark gray, the color value parameters of the material include L=50 to 53, a=1 to 2, and b=4 to 5; Preferably, when the material presents a medium gray color, the composition of the material, by mass percentage, includes burnt ash: 43% to 47%, kaolin: 3% to 7%, fine tile ash: 25% to 30% and graphite powder: 18% to 22%; when the material presents a medium gray color, the color value parameters of the material include L=55 to 58, a=1 to 2, and b=5 to 6; Preferably, when the material is light gray, the composition of the material, calculated by mass percentage, includes burnt gravel: 45% to 50%, quartz sand: 3% to 7%, fine tile ash: 25% to 30% and graphite powder: 15% to 20%; when the material is light gray, the color value parameters of the material include L=59 to 61, a=1 to 3, b=5 to 6.

5.

3. The material according to claim 2, characterized in that When the material is dark gray, the composition of the material, by mass percentage, includes burnt gravel: 45%, kaolin: 5%, fine tile ash: 10% and graphite powder: 40%; when the material is dark gray, the color value parameters of the material include L=51-52, a=1.5-2, b=4.2-4.8; Preferably, when the material presents a medium gray color, the composition of the material, by mass percentage, includes burnt ore: 45%, kaolin: 5%, fine tile ash: 30% and graphite powder: 20%; when the material presents a medium gray color, the color value parameters of the material include L=56-57, a=1.5-2, b=5.4-6; Preferably, when the material is light gray, the composition of the material, by mass percentage, includes burnt gravel: 50%, quartz sand: 5%, fine tile ash: 30% and graphite powder: 15%; when the material is light gray, the color value parameters of the material include L=59~60, a=1.5~2.5, b=5.5~6.

4. The material according to claim 1, characterized in that When the material is dark gray with a yellowish tint, the composition of the material, by mass percentage, includes burnt granite: 22% to 28%, quartz sand: 12% to 18%, clay: 22% to 28% and graphite powder: 32% to 38%; when the material is dark gray with a yellowish tint, the color value parameters of the material include L=50 to 52, a=2 to 3, and b=6 to 7; Preferably, when the material is medium gray with a yellowish tint, the composition of the material, by mass percentage, includes burnt granite: 10% to 15%, quartz sand: 28% to 32%, terra cotta: 35% to 40% and graphite powder: 18% to 22%; when the material is medium gray with a yellowish tint, the color value parameters of the material include L=46 to 49, a=3 to 4.5, and b=9 to 11; Preferably, when the material is light gray with a yellowish tint, the composition of the material, calculated by mass percentage, includes burnt gravel: 5% to 10%, quartz sand: 30% to 35%, clay: 40% to 45% and graphite powder: 15% to 20%; when the material is light gray with a yellowish tint, the color value parameters of the material include L=45 to 48, a=3 to 4, and b=8 to 9.

5.

5. The material according to claim 4, characterized in that When the material is dark gray with a yellowish tint, the composition of the material, by mass percentage, includes burnt granite: 25%, clay: 25%, quartz sand: 15% and graphite powder: 35%; when the material is dark gray with a yellowish tint, the color value parameters of the material include L=50.5-51.5, a=2.4-2.8, b=6.5-7; Preferably, when the material is medium gray with a yellowish tint, the composition of the material, by mass percentage, includes burnt gravel: 12.5%, clay: 37.5%, quartz sand: 30% and graphite powder: 20%; when the material is medium gray with a yellowish tint, the color value parameters of the material include L=47-48, a=3.5-4.5, b=9.5-10.5; Preferably, when the material is light gray with a yellowish tint, the composition of the material, calculated by mass percentage, includes burnt gravel: 5%, clay: 45%, quartz sand: 35% and graphite powder: 15%; when the material is light gray with a yellowish tint, the color value parameters of the material include L=46~47, a=3.2~3.8, b=8.5~9.

6. The material according to claim 1, characterized in that When the material is reddish, the composition of the material, by mass percentage, includes burnt gravel: 25% to 30%, red clay: 20% to 25% and graphite powder: 45% to 50%; when the material is reddish, the color value parameters of the material include L=43 to 46, a=4 to 5, and b=6 to 7; Preferably, when the material appears whitish, the composition of the material, by mass percentage, includes burnt gravel: 22% to 28%, quartz sand: 18% to 22%, kaolin: 22% to 28%, fine ash: 8% to 12% and graphite powder: 18% to 22%; when the material appears whitish, the color value parameters of the material include L=56 to 58, a=1.5 to 2.5, and b=4.5 to 5.

5.

7. The material according to claim 6, characterized in that When the material is reddish, the composition of the material, by mass percentage, includes burnt granite: 25%, red clay: 25% and graphite powder: 50%; when the material is reddish, the color value parameters of the material include L=44-45, a=4-4.8, b=6.5-7; Preferably, when the material appears whitish, the composition of the material, by mass percentage, includes burnt gravel: 25%, kaolin: 25%, quartz sand: 20, fine ash: 10% and graphite powder: 20%; when the material appears whitish, the color value parameters of the material include L=56.5~57.5, a=1.8~2.2, b=4.8~5.

2.

8. The material according to claim 1, characterized in that When the material presents a dark blue-gray color, the composition of the material, by mass percentage, includes burnt granite: 22% to 28%, kaolin: 22% to 28%, fine tile ash: 22% to 28%, graphite powder: 18% to 22% and chlorite powder: 3% to 5%; when the material presents a dark blue-gray color, the color value parameters of the material include L=56 to 59, a=1 to 2, and b=3.5 to 4.5; Preferably, when the material is dark blue-gray, the composition of the material, by mass percentage, includes burnt ore: 25%, kaolin: 25%, chlorite powder: 5%, fine ash: 25% and graphite powder: 20%; when the material is dark blue-gray, the color value parameters of the material include L=57-58, a=1-1.5, b=3.5-4.2; Preferably, when the material is light blue-gray, the composition of the material, by mass percentage, includes burnt ash: 10% to 15%, kaolin: 33% to 37.5%, fine ash: 18% to 22%, graphite powder: 22% to 28% and chlorite powder: 3% to 5%; when the material is light blue-gray, the color value parameters of the material include L=59 to 62, a=0.5 to 1.5, b=3 to 4; Preferably, when the material is light bluish gray, the composition of the material, by mass percentage, includes burnt ore: 12.5%, kaolin: 37.5%, chlorite powder: 5%, fine ash: 20% and graphite powder: 25%; when the material is light bluish gray, the color value parameters of the material include L=60~61, a=0.5~1, b=3.2~3.

8.

9. The material according to any one of claims 2 to 8, characterized in that The particle size of the quartz sand is 150-200 meshes.

10. Use of the material according to any one of claims 1 to 9 in tuff-like 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 tuff-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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