Manufacturing method of sediment rock core display specimen

Abstract

The invention discloses a manufacturing method of a sediment rock core display specimen, belongs to the technical field of specimen manufacturing, and solves the problems of poor specimen safety and specimen visibility caused by a sealing material in the prior art. The manufacturing method of the sediment rock core display specimen comprises the following steps: sequentially carrying out infiltration treatment on a sediment rock core by adopting a hydrogen peroxide solution and a dodecyl dimethyl benzyl ammonium chloride solution under the conditions that the temperature is 15 to 25 DEG C and the humidity is 40 to 60 percent, so as to obtain a pretreated sediment rock core; embedding the pretreated sediment rock core by adopting transparent resin, and curing to obtain an embedded rock core; grinding and polishing the embedded rock core to obtain a sediment rock core display specimen; wherein biological remains / remain in the sediment core should be retained. The sediment rock core display specimen provided by the invention is simple in manufacturing method, high in practicability and low in cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of specimen preparation, more particularly to a method for preparing a sediment core display specimen. BACKGROUND

[0002] Sediment core refers to a sample of sedimentary layer of a lake, ocean or land, which is a cylindrical sediment sample drilled from the bottom of the ground or water body, and records key information such as environmental evolution, climate change and biological activity, and is important physical data for research in the fields of geology and environmental science. By preparing a sediment core display specimen, people can more intuitively understand how the sediment core participates in scientific research.

[0003] In the prior art, a related technology for preparing a specimen of a sediment core uses cyanogum preservative paint to seal the core (Cui, G. Y. New method for preparing a display specimen of a sediment core in a museum [J]. Science Education and Museum, 2016, 2(05): 358-360. DOI: 10.16703 / j.cnki.31-2111 / n.2016.05.009.). The technology does not specify the concentration of reagents in the sterilization and algae removal operation, and does not specify the ratio of cyanogum preservative paint to solvent. Moreover, cyanogum has a large shrinkage rate as a sealing material, which causes the core to separate from the core tube after solidification, and there is a risk of falling off during transportation or vertical display. Cyanogum has poor light transmission, which causes the sediment core display specimen prepared by the method to only be able to observe the texture of the core, but not the color and details of the sediment. In addition, the technical solution does not have a treatment scheme for biological remains and traces that may exist in the core.

[0004] Therefore, the present application aims to specify the concentration of each reagent in the sterilization and algae removal operation, solve the specimen safety problem caused by the shrinkage of the sealing material, solve the poor visibility problem of the specimen caused by the poor permeability of the sealing material, and provide a method for preparing a display specimen that is suitable for safe display, has good visibility, and can preserve biological remains and traces in the sediment core. SUMMARY

[0005] The present application provides a method for preparing a sediment core display specimen to solve the problems of specimen safety and poor specimen visibility caused by the sealing material in the prior art.

[0006] In a first aspect, the present application provides a method for preparing a sediment core display specimen, comprising the following steps: sequentially immersing a sediment core in a hydrogen peroxide solution and a dodecyl dimethyl benzyl ammonium chloride solution under the conditions of a temperature of 15-25 DEG C and a humidity of 40-60%, to obtain a pretreated sediment core; embedding the pretreated sediment core with a transparent resin, and curing to obtain an embedded core; polishing the embedded core to obtain the sediment core display specimen; wherein the biological remains and traces in the sediment core should be preserved.

[0007] As a possible implementation manner, after the hydrogen peroxide solution immersion treatment, the following processes are sequentially performed: standing and drying, cross section flattening, and then subsequent treatment.

[0008] As a possible implementation manner, the mass concentration of the hydrogen peroxide solution is 20-30%, and / or the mass concentration of the dodecyl dimethyl benzyl ammonium chloride solution is 40-50%.

[0009] As a possible implementation manner, the treatment time of the hydrogen peroxide solution is 24-30 h, and / or the treatment time of the dodecyl dimethyl benzyl ammonium chloride solution is 24-30 h.

[0010] As a possible implementation manner, the Gardner color number of the transparent resin is less than or equal to 1, and the thickness of the transparent resin is 3-5 mm.

[0011] As a possible implementation manner, the transparent resin is an epoxy resin or a polyurethane resin.

[0012] As a possible implementation manner, the polishing treatment is performed by sequentially using 160-mesh, 240-mesh, 360-mesh, 600-mesh, 800-mesh, 1200-mesh and 2000-mesh sandpaper to polish the surface of the embedded core, and then polishing the surface with a polishing agent until no circle lines are observed.

[0013] In a second aspect, the present application provides a sediment core display specimen prepared by the method of any one of the possible implementation manners of the first aspect.

[0014] Compared with the prior art, the present application has the following advantages: The present application firstly adopts hydrogen peroxide solution and dodecyl dimethyl benzyl ammonium chloride solution to sequentially sterilize and remove algae from the sediment core, to obtain a pretreated sediment core; the biological remains or traces possibly existing in the core are cleaned and protected; the pretreated sediment core is embedded with transparent resin, the resin is degassed or defoamed, and solidified, to obtain an embedded core; the embedded core is polished to obtain a sediment core display specimen. The sediment core display specimen provided by the present application has the advantages of simple manufacturing process, strong practicability, low cost, good visibility and color fidelity, and can preserve the biological remains and traces in the core and be stored in an indoor environment for a long time. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor.

[0016] Figure 1 The sediment core display specimen manufacturing process schematic diagram provided by the present application is shown in the figure.

[0017] Figure 2 The figure shows the sterilization treatment with hydrogen peroxide solution in the sediment core display specimen manufacturing process provided by the present application.

[0018] Figure 3 The figure shows the embedding of the pretreated core specimen with transparent resin in the sediment core display specimen manufacturing process provided by the present application.

[0019] Figure 4 The figure shows the effect after polishing of the sediment core display specimen provided by the present application.

[0020] Figure 5 The figure shows the sediment core display specimen provided by the present application with biological remains. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments only constitute some embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0022] To solve the problem of poor specimen safety and specimen visibility caused by the sealing material in the prior art, the embodiment provides a manufacturing method of a sediment core display specimen.

[0023] Figure 1 An exemplary flow chart of the manufacturing process of the sediment core display specimen provided by the embodiment of the application is shown. Figure 1 As shown in the figure, the manufacturing method of the sediment core display specimen is provided, and the sediment core is sequentially subjected to sterilization and algae removal treatment by using hydrogen peroxide solution and dodecyl dimethyl benzyl ammonium chloride solution to obtain a pretreated sediment core.

[0024] Specifically, the manufacturing method of the sediment core display specimen provided by the application comprises the following steps: At 15-25℃ and 40%-60% humidity, the sediment core is sequentially subjected to sterilization and algae removal treatment by using hydrogen peroxide solution and dodecyl dimethyl benzyl ammonium chloride solution to obtain a pretreated sediment core. Figure 2 As shown in the figure.

[0025] The biological remains and traces in the core are to be retained. For remains that are too large and exceed the cross section of the core, they are to be retained in the core display specimen to reflect their existence in the rock layer. Figure 5 An exemplary sediment core display specimen with biological remains is shown.

[0026] The pretreated sediment core is embedded with transparent resin, and the resin is subjected to vacuum degassing treatment or heating defoaming treatment, and then solidified to obtain an embedded core. Figure 3 As shown in the figure, the pretreated core specimen is embedded with transparent resin. Figure 4 As shown in the figure, the embedded core is polished to obtain a sediment core display specimen.

[0027] The manufacturing method of the sediment core display specimen is constructed by the application, and the specific technical idea and process are as follows: ① Sterilization and algae removal treatment: The prepared sediment core specimens will be displayed at room temperature for a long period of time. To ensure the long-term preservation of the specimens at room temperature, the sediment cores must undergo appropriate sterilization and algae removal treatment to prevent the growth of bacteria and algae. For example, broad-spectrum sterilizing and algae-removing agents hydrogen peroxide solution and dodecyl dimethyl benzyl ammonium chloride solution (commercially available 1227 stock solution) are used to sequentially wet the cores. The wettability standard is to ensure that the core profile is uniformly moistened. After each treatment, the cores must be allowed to stand and dry for about 20 hours before proceeding with the next treatment.

[0028] ② Core surface smoothing treatment: The strong redox reaction between hydrogen peroxide solution and the substances in the sediment caused the smooth core cross section to be damaged by the gas produced by the reaction. After treatment with hydrogen peroxide solution, the cross section was smoothed with a single-edged shovel.

[0029] ③ Treatment of biological remains or traces in the core: For remains that can be observed in the core profile, the observable surface should be cleaned to clearly display the organisms in the core strata. If there are stubborn dirt or sediments attached, the remains can be removed and cleaned appropriately (physical or chemical methods). After cleaning, they should be put back in place. For traces, the traces and characteristics should be preserved to avoid damage during the sterilization and algae removal process.

[0030] ④ Core embedding and fixation treatment: Room temperature curing transparent resin is used to embed and fix the core, and vacuum or heating methods are used for defoaming treatment to ensure the finished product's aesthetic effect.

[0031] ⑤ Surface grinding and polishing: First, grind the surface with sandpaper from 160 grit to 2000 grit, starting with the grit from low to high. Then, use a polishing compound to polish the surface until the circular marks are no longer visible.

[0032] ⑥ Make proper markings and records. After each sediment core specimen is prepared, mark the core collection information on the back of the core tube.

[0033] To achieve good sterilization and algae removal effects, the hydrogen peroxide solution concentration should be 20%–30%. The appropriate amount of hydrogen peroxide solution should be used to evenly wet the core profile, ensuring uniform coverage without significant flow or accumulation, and guaranteeing full penetration. The specific amount depends on the core volume and water content. A good wetting effect can be achieved by impregnating the core with a 20%–30% hydrogen peroxide solution for 24–30 hours.

[0034] In order to further improve the sterilization and algae removal effect, the mass concentration of the dodecyl dimethyl benzyl ammonium chloride solution is 40% to 50%. The dodecyl dimethyl benzyl ammonium chloride solution with a mass concentration of 40% to 50% is used for infiltration treatment for 24 to 30 hours to achieve a better infiltration effect.

[0035] In order to better preserve and display the biological remains or traces in the core, the remains observation surface should be reasonably cleaned, and physical wiping is performed using a brush or degreasing cotton, or cleaning is performed using a volatile solvent or an acid or alkali solution; the traces are appropriately filled, protected or sealed to avoid being damaged during the sterilization and algae removal treatment.

[0036] In order to maintain the high permeability of the sediment core display specimen, the Gardner color number of the transparent resin is less than or equal to 1.

[0037] In order to reduce the shrinkage rate of the resin and improve the aging resistance, the shrinkage rate of the selected transparent resin is less than 1%, and the complete curing time is greater than or equal to 12 hours. The components are strictly matched according to the ratio in the product instructions.

[0038] In order to further achieve a good observation effect of the sediment core display specimen, the resin is defoamed by vacuum degassing or heating defoaming method; after curing, the thickness of the transparent resin on the cross section of the sediment core is 3 to 5 mm. If the resin wrapping amount is too small, a better wrapping effect cannot be achieved; otherwise, if the wrapping amount is too large, the observation effect of the sediment core specimen is affected.

[0039] In order to make the surface of the embedding layer smooth and transparent and reduce glare, and improve the specimen viewing effect, during polishing, the embedding core surface is polished for 3 to 5 minutes by using 160 mesh, 240 mesh, 360 mesh, 600 mesh, 800 mesh, 1200 mesh and 2000 mesh sandpaper respectively; the surface is polished using a polishing agent until the polishing effect cannot be observed.

[0040] In order to ensure the flatness of the cross section of the sediment core after subsequent infiltration treatment with the dodecyl dimethyl benzyl ammonium chloride solution, the cross section of the sediment core is flattened after the hydrogen peroxide solution infiltration treatment, that is, the part of the planar convex part after the hydrogen peroxide treatment is repaired and flattened by using a spatula.

[0041] The technical solutions of the present application will be further described below in combination with specific embodiments.

[0042] Embodiment 1 The present embodiment provides a method for manufacturing a sediment core display specimen.

[0043] At a temperature of 15 to 25 degrees Celsius and a humidity of 40% to 60%, the sediment core is infiltrated with a hydrogen peroxide solution with a mass concentration of 20% to 30%, and is left to dry for 20 hours. The surface deposits of the observable surface of the core are cleaned, the original shell inlay in the core is obviously higher than the cross section of the core, the deposits are difficult to clean, and the shell color and lines are difficult to observe clearly. The shell is taken out of the core, wiped with a weak acid solution, and the weak acid solution remaining on the surface is rinsed with clean water. After wiping, the shell is put back in place; The sediment core treated by the hydrogen peroxide solution is immersed and treated by a 40-50% mass concentration of dodecyl dimethyl benzyl ammonium chloride solution, and is left to dry for 24-30 hours to obtain a pretreated sediment core. The pretreated sediment core is embedded by a transparent epoxy resin with a Gardner color number of less than or equal to 1, and the resin is defoamed by a baking lamp heating method, and is cured to obtain an embedded core with a transparent resin thickness of 3-5 mm. The embedded core is polished, and during polishing, the surface of the embedded core is polished by 160 mesh, 240 mesh, 360 mesh, 600 mesh, 800 mesh, 1200 mesh, and 2000 mesh sandpaper in sequence. The surface is polished by a polishing agent until no ring marks are observed, and a sediment core display specimen is obtained.

[0044] Example 2 The present embodiment provides a method for manufacturing a sediment core display specimen.

[0045] The sediment core is sequentially immersed and treated by a 20-30% mass concentration of hydrogen peroxide solution at a temperature of 15-25°C and a humidity of 40-60%, and is left to dry for 20 hours. The sediment core immersed by the hydrogen peroxide solution is immersed and treated by a 40-50% mass concentration of dodecyl dimethyl benzyl ammonium chloride solution, and is left to dry for 24-30 hours to obtain a pretreated sediment core. The pretreated sediment core is embedded by a transparent resin with a Gardner color number of less than or equal to 1, and the resin is defoamed by a baking lamp heating method, and is cured to obtain an embedded core with a transparent resin thickness of 3-5 mm. The embedded core is polished, and during polishing, the surface of the embedded core is polished by 160 mesh, 240 mesh, 360 mesh, 600 mesh, 800 mesh, 1200 mesh, and 2000 mesh sandpaper in sequence. The surface is polished by a polishing agent until no ring marks are observed, and a sediment core display specimen is obtained.

[0046] Although the preferred embodiments of the present application have been described, those skilled in the art can make further changes and modifications to the embodiments once they know the basic inventive concept. Therefore, the appended claims are intended to be interpreted as including all changes and modifications falling within the scope of the present application.

[0047] Obviously, many modifications and variations of the present application are possible in light of the above teachings. It is, therefore, to be understood that within the scope of the appended claims and their equivalents, the application can be practiced otherwise than as specifically described.

Claims

1. A method for preparing a sediment core display specimen, characterized in that, Includes the following steps: Pretreated sediment cores were obtained by sequentially impregnating the sediment cores with hydrogen peroxide solution and dodecyl dimethyl benzyl ammonium chloride solution at a temperature of 15-25℃ and a humidity of 40%-60%. The pretreated sediment core was embedded in transparent resin and then cured to obtain the embedded core. The embedded core was ground and polished to obtain the sediment core display specimen; Among them, biological remains / traces in the sediment core should be preserved.

2. The method according to claim 1, characterized in that, After being impregnated with hydrogen peroxide solution, the sample is allowed to stand and dry, then the cross-section is trimmed, and finally further processing is carried out.

3. The method according to claim 1, characterized in that, The mass concentration of the hydrogen peroxide solution is 20%~30%; And / or, the mass concentration of the dodecyl dimethyl benzyl ammonium chloride solution is 40%~50%.

4. The method according to claim 1, characterized in that, The treatment time for the hydrogen peroxide solution is 24-30 h; And / or, the treatment time of the dodecyl dimethyl benzyl ammonium chloride solution is 24-30 h.

5. The method according to claim 1, characterized in that, The Gardner color number of the transparent resin is ≤1; Furthermore, the thickness of the transparent resin is 3-5 mm.

6. The method according to claim 5, characterized in that, The transparent resin is epoxy resin or polyurethane resin.

7. The method according to claim 1, characterized in that, The grinding and polishing process is as follows: the surface of the embedded core is ground sequentially with sandpaper of 160 grit, 240 grit, 360 grit, 600 grit, 800 grit, 1200 grit, and 2000 grit; the surface is then polished with a polishing agent until no circular marks are visible.

8. Sediment core display specimens prepared by the method according to any one of claims 1 to 7.

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