A bio-based solution, method of making and method of use

Abstract

The application discloses a kind of biological base solution, preparation method and use method, the biological base solution includes the following volume fraction of formula ingredients: catalytic liquid 900~1100 parts, reaction liquid 900~1100 parts, thickening liquid 8~14 parts, reflective biological colorant 200~400 parts, dispersion liquid 3~6 parts.The biological base solution that the application is configured to improve the surface light reflection performance of sand by adopting biological enzyme technology and combining reflective biological colorant, since the biological base solution has good permeability and solidification film forming capacity, can improve the surface light reflection efficiency after spraying and inhibit wind erosion dust.

Description

Technical Field

[0001] This invention relates to a bio-based solution, its preparation method, and its application method, belonging to the field of civil engineering materials technology. Background Technology

[0002] To overcome the limitations of traditional single-sided photovoltaic panels that rely on front-side light absorption and further increase power generation per unit area, bifacial solar photovoltaic panels have emerged. However, the power generation gain of bifacial photovoltaic panels mainly comes from the light reflection capacity of the underlying soil surface. In actual photovoltaic power plant sites, the natural, unspoiled sand has extremely low reflectivity, limiting the power generation gain of the back panel. Furthermore, exposed sandy surfaces are highly susceptible to wind erosion and dust generation; the scattered dust not only blocks sunlight, causing a sharp drop in power generation efficiency, but also increases the maintenance costs of photovoltaic modules.

[0003] Therefore, how to develop a new material that can both environmentally solidify undisturbed sand to suppress wind erosion and dust, and significantly improve the surface light reflection efficiency, thereby increasing the power generation revenue of the backsheet, has become a key problem that urgently needs to be solved in the field of new energy photovoltaic engineering. Summary of the Invention

[0004] This invention provides a bio-based solution, its preparation method, and its usage method, which solves the problems disclosed in the background art.

[0005] According to one aspect of this application, a bio-based solution is provided, comprising the following components in parts by volume: 900-1100 parts of catalyst, 900-1100 parts of reaction solution, 8-14 parts of thickening solution, 200-400 parts of reflective bio-colorant, and 3-6 parts of dispersion solution; wherein the catalyst is a plant extract or microbial culture solution, the reaction solution is a reaction solution composed of metal salt reagent and urea, the thickening solution is one or more of xanthan gum, sodium alginate, and polyacrylamide, the dispersion solution is one or more of polycarboxylic acid water-reducing agent, naphthalene water-reducing agent, and aliphatic water-reducing agent, and the reflective bio-colorant is a mixture of Bacillus subtilis, Bacillus subtilis metabolites, and bio-based mineral powder.

[0006] Furthermore, if the bio-based solution is sprayed in a scenario with a wind speed of less than 5 m / s, the thickening liquid should be 8 to 12 parts; if the solution is sprayed in a scenario with a wind speed of not less than 5 m / s, the thickening liquid should be 10 to 14 parts.

[0007] Furthermore, if the bio-based solution is sprayed in a scenario where the probability of rainfall is greater than 60% within 24 hours, the formulation also includes 15-30 parts of a quick-setting agent.

[0008] Furthermore, if the bio-based solution is sprayed in a scenario where the day-night temperature difference is greater than 15°C, the formulation also includes 10-25 parts of a heat-insulating agent.

[0009] Furthermore, the bio-based mineral powder is one or more of ultrafine shell powder, oyster powder, and pearl powder.

[0010] According to another aspect of this application, a method for preparing a bio-based solution is provided, wherein the bio-based solution is the aforementioned bio-based solution, and the preparation method includes: The catalyst and reaction solution are mixed according to volume fractions to obtain the basic cementing solution; The remaining liquids are mixed according to volume fractions to obtain a cured coloring suspension; During a preset time period before the bio-based solution is sprayed, the base binder and the curing coloring suspension are mixed and continuously stirred to obtain the bio-based solution.

[0011] According to another aspect of this application, a method for using a bio-based solution is provided, wherein the bio-based solution is sprayed onto a ground area facing the back of a double-sided photovoltaic panel.

[0012] Furthermore, the actual spraying volume of the bio-based solution is determined based on the baseline spraying volume, the spraying season, the wind speed at the time of spraying, and the soil particle size. The formula for calculating the actual spraying volume is: Actual spraying volume = Baseline spraying volume × Adjustment coefficient corresponding to the spraying season × Adjustment coefficient corresponding to the wind speed × Adjustment coefficient corresponding to the soil particle size.

[0013] Furthermore, the baseline spraying rate is 5L / m² to 10L / m²; If the spraying season is the dry season, the adjustment coefficient corresponding to the spraying season is 1.2~1.4, and the construction adopts a multi-round thin spraying method; if the spraying season is the rainy season, the adjustment coefficient corresponding to the spraying season is 0.6~0.7; the adjustment coefficient corresponding to other conventional seasons is 1.0; if the wind speed during spraying is not less than 5m / s, the adjustment coefficient corresponding to the wind speed is 1.2~1.4; if the wind speed during spraying is less than 5m / s, the adjustment coefficient corresponding to the wind speed is 1.0; if the median particle size of the soil is greater than 0.5mm, the adjustment coefficient corresponding to the soil particle size is 1.2~1.3; if the median particle size of the soil is less than 0.25mm, the adjustment coefficient corresponding to the soil particle size is 0.8~0.9; the adjustment coefficient corresponding to other median particle sizes is 1.0.

[0014] The beneficial effects achieved by this invention are as follows: This invention uses bio-enzyme technology combined with reflective bio-coloring agents to formulate a bio-based solution that improves the light reflection performance of sandy surfaces. Because this bio-based solution has good permeability and solidification film-forming ability, it can improve the light reflection efficiency of the ground surface and suppress wind erosion and dust after spraying. Attached Figure Description

[0015] Figure 1 A comparison curve of spectral reflectance at different wavelengths; Figure 2 This is a comparison chart of the back panel irradiance. Detailed Implementation

[0016] The present invention is further described in detail through the following embodiments. It should be noted that the following embodiments are illustrative and not limiting, and should not be used to limit the scope of protection of the present invention.

[0017] Example 1: A bio-based solution comprising the following components in parts by volume: 900-1100 parts catalyst, 900-1100 parts reaction solution, 8-14 parts thickening solution, 200-400 parts reflective biocolorant, and 3-6 parts dispersion solution.

[0018] It should be noted that the reaction solution can be purchased directly and is mainly composed of metal salt reagents and urea. The metal salt reagents are soluble salts that can provide calcium or magnesium ions, etc. The concentration of the reaction solution is set at 0.5~1 mol / L.

[0019] The thickening agent can be selected from one or more of xanthan gum, sodium alginate, and polyacrylamide, or it can be purchased directly. In some embodiments, if the bio-based solution is sprayed in a scenario with a wind speed of less than 5 m / s, 8 to 12 parts of the thickening agent can be used to ensure that the bio-based solution can penetrate deep into the pores of the sand and soil, increasing the thickness and strength of the solidified layer; if the bio-based solution is sprayed in a scenario with a wind speed of not less than 5 m / s, 10 to 14 parts of the thickening agent can be used to enhance the wind resistance of the droplets by increasing the viscosity of the bio-based solution, and to quickly form a viscous liquid film on the ground surface, providing early physical adhesion and preventing wind erosion before hardening.

[0020] The dispersion can be selected from one or more combinations of polycarboxylate superplasticizers, naphthalene superplasticizers, and aliphatic superplasticizers, or it can be purchased directly.

[0021] The catalyst solution can be prepared using existing mature plant extraction or microbial culture techniques. The urease activity in the catalyst solution is set to 7-9 mmol / L / min. The specific preparation process includes: taking plant raw materials such as soybeans or sword beans, physically grinding them, dissolving them in water, centrifuging them, and then extracting their supernatant to obtain plant extracts such as soybean protein extract or sword bean extract; or obtaining microbial strains with urease-producing ability such as Pasteurella multocida and its culture medium, and carrying out large-scale culture at 25-35°C; the above extracts or culture solutions are finally tested for urease activity to obtain the catalyst solution.

[0022] The reflective biocolorant is obtained through secondary processing of raw materials. The specific preparation steps are as follows: Natural seashells, oyster shells, or mother-of-pearl, etc., are bio-based calcium raw materials. After cleaning and drying, they are ground into ultrafine bio-based mineral powder. Then, Bacillus subtilis strain is taken and inoculated into liquid culture medium. It is fermented at a constant temperature of 30-37°C until the urease activity of Bacillus subtilis cells in the fermentation broth reaches 2-4 mmol / L / min. The metabolites of Bacillus subtilis are collected. Finally, 50-100 parts of Bacillus subtilis and its metabolites are uniformly blended with 150-300 parts of the bio-based mineral powder to obtain the reflective biocolorant.

[0023] This reflective bio-colorant uses fully ecological bio-based materials, which not only achieves environmental friendliness by eliminating heavy metal pollution, but also realizes the resource utilization of waste. Bacillus subtilis and its metabolites, shell powder and other bio-based mineral powders can effectively improve the solidification strength of the ground surface.

[0024] Since the base cementitious liquid usually has a yellowish color after curing, by introducing the white reflective bio-colorant into the final solution, the original yellowish base color of the sandy ground can be effectively covered, and the site can be adjusted to a highly reflective white. This color adjustment can effectively improve the reflectivity of the ground surface to different wavelengths of light radiation during diffuse reflection. Furthermore, Bacillus subtilis and its extracellular metabolites, which are uniformly mixed in the reflective bio-colorant, can penetrate and fill the gaps between the sand grains and the cementitious material, thereby enhancing the curing strength of the surface solidification layer.

[0025] It should be noted that in some embodiments, if the bio-based solution is sprayed in a scenario where the probability of rainfall is greater than 60% within 24 hours, i.e., a scenario with a high probability of rainy season or sudden rainfall, the formulation also includes 15 to 30 parts of a quick-setting agent. By adding a quick-setting agent to the formulation, the rapid crusting requirement during the rainy season or sudden rainfall can be met.

[0026] In some embodiments, if the bio-based solution is sprayed in a scenario where the diurnal temperature difference is greater than 15°C, such as in a desert region, the formulation also includes 10-25 parts of a thermal insulation agent. By adding the thermal insulation agent to the formulation, the influence of the diurnal temperature difference on the bio-based solution can be reduced.

[0027] The aforementioned bio-based solution uses bio-enzyme technology combined with reflective bio-colorants to formulate a bio-based solution that enhances the light reflection performance of sandy surfaces. Specifically, by introducing reflective bio-colorants, the overall background color of the site is transformed into a highly reflective white. This color control can effectively improve the surface's reflectivity to different wavelengths of light radiation during diffuse reflection. Furthermore, due to the good permeability and film-forming ability of this bio-based solution, spraying it can improve the surface's light reflection efficiency and suppress wind erosion and dust.

[0028] Example 2, a method for preparing a bio-based solution, specifically the above-mentioned method for preparing a bio-based solution, may include: Step 1: Mix the catalyst and reaction solution according to volume fractions to obtain the basic cementing solution. Specifically, mix 900-1100 parts of catalyst and 900-1100 parts of reaction solution.

[0029] Step 2: Mix the remaining liquids according to volume proportions to obtain a cured coloring suspension.

[0030] If the remaining liquid includes a thickener, a reflective bio-colorant, and a dispersion, then mix 8-14 parts thickener, 200-400 parts reflective bio-colorant, and 3-6 parts dispersion. If the remaining liquid includes a quick-setting agent, a thickener, a reflective bio-colorant, and a dispersion, then mix 15-30 parts quick-setting agent, 8-14 parts thickener, 200-400 parts reflective bio-colorant, and 3-6 parts dispersion. If the remaining liquid includes a heat-retaining agent, a thickener, a reflective bio-colorant, and a dispersion, then mix 10-25 parts heat-retaining agent, 8-14 parts thickener, 200-400 parts reflective bio-colorant, and 3-6 parts dispersion. If the remaining liquids include accelerators, heat-insulating agents, thickeners, reflective bio-colorants, and dispersions, then mix 15-30 parts of accelerator, 10-25 parts of heat-insulating agent, 8-14 parts of thickener, 200-400 parts of reflective bio-colorant, and 3-6 parts of dispersion.

[0031] Step 3: During a preset time period before the bio-based solution is sprayed, the base binder and the curing coloring suspension are mixed and continuously stirred to obtain the bio-based solution.

[0032] Since a large amount of carbonate precipitate will be generated after the catalyst solution is mixed with the reaction solution, the preparation of the bio-based solution needs to be carried out before the spraying operation, generally within 15 to 30 minutes before spraying.

[0033] It should be noted that before preparing the bio-based solution, the environment of the spraying area needs to be determined, specifically the local weather conditions, such as wind speed, probability of rainfall, and diurnal temperature range. The appropriate components and their corresponding quantities should be determined based on the different environments.

[0034] The above method can be used to prepare bio-based solutions. The bio-based solutions are prepared by combining bio-enzyme technology with reflective bio-colorants to improve the light reflection performance of sandy surfaces. They have good permeability and solidification film-forming ability. After spraying, they can improve the light reflection efficiency of the ground surface and suppress wind erosion and dust. Example

[0035] A method for using a bio-based solution, mainly for curing the ground on the back of a double-sided photovoltaic panel, specifically involves spraying the aforementioned bio-based solution onto the ground area facing the back of the double-sided photovoltaic panel.

[0036] It should be noted that, to achieve the best curing and reflective effects, the spraying volume should be adjusted according to the baseline spraying amount during the spraying operation. The spraying season, wind speed during spraying, and soil particle size are dynamically adjusted, and the specific rules are as follows: The baseline spraying rate is generally 5 L / m² to 10 L / m². When facing complex working conditions, the actual spraying rate is determined comprehensively according to the adjustment coefficients corresponding to each environmental parameter, that is: actual spraying rate = baseline spraying rate × adjustment coefficient corresponding to the spraying season × adjustment coefficient corresponding to wind speed × adjustment coefficient corresponding to soil particle size.

[0037] Specifically, if the spraying season is the dry season, the adjustment coefficient corresponding to the spraying season is 1.2~1.4, and the construction adopts a multi-round thin spraying method; if the spraying season is the rainy season, the adjustment coefficient corresponding to the spraying season is 0.6~0.7; the adjustment coefficient corresponding to other conventional seasons is 1.0; if the wind speed during spraying is not less than 5m / s, the adjustment coefficient corresponding to the wind speed is 1.2~1.4; if the wind speed during spraying is less than 5m / s, the adjustment coefficient corresponding to the wind speed is 1.0; if the median particle size of the soil is greater than 0.5mm, the adjustment coefficient corresponding to the soil particle size is 1.2~1.3; if the median particle size of the soil is less than 0.25mm, the adjustment coefficient corresponding to the soil particle size is 0.8~0.9; the adjustment coefficient corresponding to other median particle sizes is 1.0.

[0038] Spraying the aforementioned bio-based solution onto the ground area facing the back of the double-sided photovoltaic panel does not involve increasing the local specular reflection ratio. Instead, it maintains the original natural diffuse reflection state of the ground surface. By introducing a reflective bio-coloring agent, the overall background color of the site is transformed into a highly reflective white. This color control can effectively improve the reflection efficiency of the ground surface to different wavelengths of light radiation during diffuse reflection, thereby improving the power generation efficiency of the back panel of the double-sided photovoltaic panel.

[0039] To verify the effect of the above-mentioned bio-based solution spraying, sand sprayed with different formulations of the above-mentioned bio-based solution was compared; the specific formulation components can be found in Table 1, and the experimental test results can be found in Table 2.

[0040] Table 1 Formulation Ingredients

[0041] Table 2 Experimental Test Results

[0042] As shown in Table 2, groups 2 to 4 fall within the formulation range of this application. Initially, due to the incomplete solidification of the bio-based solution during the initial spraying stage, the initial reflectivity was between 0.28 and 0.31. After 24 hours of reaction, the reflectivity of each group significantly improved, eventually stabilizing between 0.68 and 0.76. This is because within this formulation range, the white reflective bio-colorant, as the system solidifies into a film, can cover the original yellowish background color of the surface, successfully controlling it to a white surface with high reflectivity. Regarding wind erosion resistance, the initial wind erosion amount of each group immediately after spraying was 5.26 to 5.74 g / m². 2 Between 0.07 and 0.14 g / m³, wind erosion decreased to 0.07~0.14 g / m³ after 15 minutes. 2 The concentration of reflectance in Group 1 is between 0.92 g / m² / min. This is because the cementitious material generated by the reaction of the catalyst and the reaction solution, together with the white bio-based mineral powder in the reflective bio-coloring agent, as well as Bacillus subtilis and its extracellular metabolites, synergistically generates carbonates that fully fill the gaps between sand grains, enhancing the wind erosion resistance of the site surface. The dosage of Group 1 is below the limit specified in this application, and its 24-hour reflectance only reaches 0.43. This indicates that due to insufficient effective components of white bio-based mineral powder and bacteria in the system, a dense white covering layer cannot be formed on the site surface. A large amount of the original yellowish base color of the sand is exposed, ultimately resulting in low reflectance. When the dosage of Group 5 exceeds the limit specified in this application, its 24-hour reflectance reaches 0.78, showing a slight improvement, but its 15-minute wind erosion rate rises to 1.92 g / m² / min, and its wind erosion resistance begins to decline. This is because the excessive mineral powder leads to an overload of powder proportion in the cementitious material. After drying, the solidified layer becomes brittle and powdery, resulting in large-scale "peeling" and flaking of the ground surface. Under continuous wind shear, the surface hard shell quickly cracks and disintegrates, ultimately leading to a significant reduction in the site's windbreak and sand-fixing effectiveness.

[0043] Further comparisons were made between natural untreated sand, sand sprayed with a base solidification solution, and sand sprayed with the aforementioned bio-based solution. The base solidification solution was the aforementioned bio-based solution with the reflective bio-colorant removed. The specific formulation components can be found in Table 3, and the experimental test results can be found in Table 4.

[0044] Table 3 Formulation Ingredients

[0045] Table 4 Experimental Test Results

[0046] As can be seen from Table 4, the above-mentioned bio-based solution is significantly better than the other two groups in terms of 24-hour reflectance and 15-minute wind erosion. It not only improves the light reflectance of the sandy surface, but also enhances the wind erosion and dust suppression effect of the sandy soil.

[0047] To verify the actual reflectance effect of the above-mentioned bio-based solution spraying on light radiation of different wavelengths, spectral reflectance tests were conducted on untreated pure sand and sand sprayed with the above-mentioned bio-based solution. The comparison curves are shown below. Figure 1 As shown. By Figure 1 It can be seen that the reflectivity of untreated pure sand is maintained between 0.2 and 0.5; while the sand sprayed with the above-mentioned bio-based solution, due to the coverage of white bio-based mineral powder in the reflective bio-colorant, has a reflectivity maintained between 0.70 and 0.85 in the wavelength range of 500nm to 2000nm.

[0048] To verify the power generation gain effect of the aforementioned bio-based solution in practical applications, comparative monitoring was conducted under the same natural light conditions. The monitoring objects were divided into three groups: the red curve represents the colored and reinforced sand field after the bio-based solution was sprayed and solidified; the black curve represents the untreated pure sand field; and the blue curve represents the field with conventional reflective microspheres laid on it. The radiance of the bifacial photovoltaic module backsheets in these three types of fields was dynamically monitored throughout the day, and the comparative curves are shown below. Figure 2 As shown.

[0049] Depend on Figure 2 It can be seen that around noon, the back surface radiance of a pure sand field is only maintained at 210~230W / m. 2 In between, traditional microsphere technology exhibits an M-shaped curve, high at both ends and low in the middle. Compared to untreated pure sand, it offers a certain gain in irradiance. However, when the midday sun's altitude angle approaches direct sunlight, the microspheres reflect most of the light back into the sky, preventing the tilted photovoltaic backsheet from effectively receiving it, resulting in a drop in backsheet irradiance to 140W / m². 2 Around 300~340W / m². Meanwhile, the color-enhanced sand field treated with the aforementioned bio-based solution maintained a component backsheet radiance of 300~340W / m² at midday. 2 This fully demonstrates that reflective bio-colorants can improve the diffuse reflection efficiency of the Earth's surface, thereby increasing the total amount of radiation received by the photovoltaic backsheet.

[0050] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A bio-based solution, characterized in that, The formulation comprises the following components in parts by volume: 900-1100 parts catalyst, 900-1100 parts reaction solution, 8-14 parts thickening solution, 200-400 parts reflective bio-colorant, and 3-6 parts dispersion solution. The catalyst is a plant extract or microbial culture medium with a urease activity of 7-9 mmol / L / min. The reaction solution is composed of a metal salt reagent and urea, where the metal salt reagent is a soluble salt that provides calcium or magnesium ions. The thickening solution is one or more of xanthan gum, sodium alginate, and polyacrylamide. The dispersion solution is one or more of polycarboxylate superplasticizers, naphthalene superplasticizers, and aliphatic superplasticizers. The reflective bio-colorant is a mixture of Bacillus subtilis, Bacillus subtilis metabolites, and bio-based mineral powders, where the bio-based mineral powders are one or more of ultrafine shell powder, oyster powder, and pearl powder.

2. The solution according to claim 1, characterized in that, If the bio-based solution is sprayed in a scenario with a wind speed of less than 5 m / s, the thickening liquid should be 8 to 12 parts; if the solution is sprayed in a scenario with a wind speed of not less than 5 m / s, the thickening liquid should be 10 to 14 parts.

3. The solution according to claim 1, characterized in that, If the bio-based solution is sprayed in a scenario where the probability of rainfall is greater than 60% within 24 hours, the formulation also includes 15-30 parts of a quick-setting agent.

4. The solution according to claim 1, characterized in that, If the bio-based solution is sprayed in a scenario where the temperature difference between day and night is greater than 15°C, the formulation also includes 10-25 parts of a heat-insulating agent.

5. A method for preparing a bio-based solution, characterized in that, The bio-based solution is the bio-based solution according to any one of claims 1 to 4, and the preparation method includes: The catalyst and reaction solution are mixed according to volume fractions to obtain the basic cementing solution; The remaining liquids are mixed according to volume fractions to obtain a cured coloring suspension; During a preset time period before the bio-based solution is sprayed, the base binder and the curing coloring suspension are mixed and continuously stirred to obtain the bio-based solution.

6. A method of using a bio-based solution, characterized in that, Spray the bio-based solution according to any one of claims 1 to 4 onto the ground area facing the back of the double-sided photovoltaic panel.

7. The method according to claim 6, characterized in that, The actual spraying volume of the bio-based solution is determined based on the baseline spraying volume, the spraying season, the wind speed at the time of spraying, and the soil particle size. The formula for calculating the actual spraying volume is: Actual spraying volume = Baseline spraying volume × Adjustment coefficient corresponding to the spraying season × Adjustment coefficient corresponding to the wind speed × Adjustment coefficient corresponding to the soil particle size.

8. The method according to claim 7, characterized in that, The standard spraying rate is 5L / m² to 10L / m². If the spraying season is the dry season, the adjustment coefficient corresponding to the spraying season is 1.2~1.4, and the construction adopts a multi-round thin spraying method; if the spraying season is the rainy season, the adjustment coefficient corresponding to the spraying season is 0.6~0.7; the adjustment coefficient corresponding to other conventional seasons is 1.0; If the wind speed during spraying is not less than 5 m / s, the adjustment coefficient for the wind speed is 1.2~1.4; if the wind speed during spraying is less than 5 m / s, the adjustment coefficient for the wind speed is 1.

0. If the median particle size of the soil is greater than 0.5 mm, the adjustment coefficient corresponding to the soil particle size is 1.2~1.3; if the median particle size of the soil is less than 0.25 mm, the adjustment coefficient corresponding to the soil particle size is 0.8~0.

9. The adjustment coefficient for other median particle sizes is 1.0.

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