Ecological brick and preparation method thereof

Abstract

The invention discloses an ecological brick and a preparation method thereof, and belongs to the technical field of ecological building materials. The ecological brick adopts a layered composite structure design, and comprises an outer anti-scouring protective layer, a middle buffer energy-absorbing layer and an inner ecological functional layer which are sequentially arranged from outside to inside, and diversion trenches with the width of 2mm and the depth of 1.5 mm are formed among micro-bulges to form latticed distribution. The preparation method comprises the four key steps of material pretreatment, layered pouring, bionic forming and intelligent maintenance. In the material pretreatment stage, Yellow River fine sand is screened and cleaned, straw fibers are soaked and modified through a sodium hydroxide solution, and basalt fibers are subjected to surface treatment through a silane coupling agent. And the layered pouring adopts a three-cavity mold system to realize accurate layer thickness control. Through the innovative structural design and preparation process, the anti-scouring performance and ecological function of the ecological brick are remarkably improved, compared with a traditional slope protection brick, the scouring loss is reduced by 42%, the plant survival rate reaches 89%, and an advanced technical solution is provided for water and soil conservation and ecological restoration engineering.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of ecological building materials, and particularly relates to an ecological brick and a preparation method thereof. BACKGROUND

[0002] Although the traditional concrete slope protection brick has good mechanical strength, it generally has poor water permeability, lacks ecological function, and is insufficient in coordination with the natural environment. In particular, in the Yellow River Basin and other ecologically fragile regions, there is an urgent need to develop new slope protection materials that have both structural protection function and ecological restoration capacity. As a new type of building material that can meet the dual needs of engineering protection and ecological restoration, ecological brick has become an important development direction in the fields of water conservancy engineering and ecological construction.

[0003] At present, there is a certain research foundation and practical application in the field of ecological brick technology at home and abroad. Chinese patent CN111187074 A discloses an ecological brick and a preparation method thereof. The technology uses silt as the main raw material, and is combined with zeolite and pore-forming agent and other components to be prepared through vacuum mud conditioning, drying, calcination and other process steps. The ecological brick adopts a ratio of silt 10-50%, zeolite 5-25%, pore-forming agent 0.1-5%, and water 15-25%, and forms a multi-level pore structure through the comprehensive utilization of silt, pore-forming agent and zeolite. The ecological brick realizes the resource utilization of solid waste, has excellent water permeability and pollutant filtration performance, and has significant economic value and social value.

[0004] However, the existing technology still has obvious deficiencies in actual engineering application. First, the existing ecological brick mainly relies on calcination process forming, which has high energy consumption and long production cycle, and is not conducive to large-scale engineering application. Second, the existing product is weak in terms of erosion resistance, and is difficult to adapt to the complex hydrological conditions of the Yellow River and other high-sediment rivers. In addition, the existing technology lacks layered structure design for different ecological function needs, and has limitations in plant growth adaptability, water purification effect and other aspects. Most importantly, the surface structure of the existing ecological brick is relatively simple, lacks bionic optimization design, and cannot effectively utilize the principles of fluid mechanics in nature to enhance the erosion resistance and ecological adaptability. Therefore, it is of great significance to develop a new type of ecological brick product with layered composite structure, excellent erosion resistance and good ecological function, and an efficient preparation technology thereof, to promote the development of China's water conservancy engineering and ecological restoration industry. SUMMARY

[0005] Based on the above purpose, the present application provides an ecological brick and a preparation method thereof

[0006] The ecological brick comprises, from outside to inside, an outer layer of anti-scouring protective layer, a middle layer of buffer energy-absorbing layer and an inner layer of ecological functional layer, and the overall size of the ecological brick is 300 mm in length, 200 mm in width and 60 mm in thickness.

[0007] Further, the outer layer of anti-scouring protective layer is made of the following raw materials in the weight ratio: 105 parts of Portland cement, 75 parts of pretreated fine sand of the Yellow River, 9 parts of basalt fiber, 36 parts of expanded perlite, 60 parts of fly ash, 9 parts of biological enzyme curing agent and 6 parts of anti-freezing additive, and the water-binder ratio is 0.35.

[0008] Further, the middle layer of buffer energy-absorbing layer comprises 62.5 parts of pretreated straw fiber, 75 parts of ceramsite, 7.5 parts of water-absorbing resin and 5 parts of slow-release nutrient agent, and the density of the foamed cement is 600-800 kg / m 3 .

[0009] Further, the inner layer of ecological functional layer comprises 125 parts of biomass substrate, 37.5 parts of water-retaining agent, 25 parts of slow-release fertilizer, 12.5 parts of microbial agent and 50 parts of organic fiber, and the biomass substrate is made of corn straw, rice straw and sawdust in the weight ratio of 2:2:1.

[0010] Further, the ecological brick is provided with a trapezoidal tenon and a mortise around the periphery, the tenon has an inclination angle of 15° and a depth of 8 mm, and a modified polyurethane sealant strip is arranged in the mortise.

[0011] The preparation method of the ecological brick comprises the following steps:

[0012] Material pretreatment: the fine sand of the Yellow River is screened and washed to remove particles with a particle size greater than 2 mm, and the clay content is controlled to be less than 3%; the straw fiber is cut to a length of 8-15 mm and soaked in a sodium hydroxide solution for 24 hours; the basalt fiber is surface treated with a silane coupling agent;

[0013] Layered pouring: a three-cavity layered mold is used, the materials of each layer are prepared according to the proportion and poured layer by layer, the outer layer is vibrated for 90 seconds at a vibration frequency of 50 Hz, the middle layer is vibrated at a vibration frequency of 25 Hz for 60 seconds, and the inner layer is formed by light pressing with a pressure controlled at 0.1-0.2 MPa;

[0014] Biomimetic forming: 15-20 minutes after the pouring of the outer layer of concrete is completed, a silicone mold with a biomimetic microstructure is lightly pressed on the surface at a pressure of 0.05 MPa for 30 seconds and then removed;

[0015] Intelligent maintenance: control the temperature of the maintenance room to be 20±2 DEG C, the relative humidity is 85-95%, the continuous spray maintenance in the first 24 hours, the intermittent spray in the 2th-7th day, the spray twice a day in the 8th-28th day.

[0016] Further, in the preparation process of the outer layer of the anti-scouring protective layer, the mold temperature is controlled at 15-25 DEG C, and each raw material is sequentially added into a forced mixer for dry mixing for 2 minutes and then wet mixing with mixing water for 5 minutes.

[0017] Further, in the preparation of the foamed cement of the middle layer of the buffer energy absorption layer, the cement and water are mixed into a cement slurry according to a weight ratio of 1:0.4, and then a foaming agent is added, and the stirring time is controlled within 3 minutes.

[0018] Further, the silica gel template of the bionic microstructure is made by using a laser engraving technology, and the micro-protrusions on the surface of the template are distributed in a grid shape with the flow guide grooves.

[0019] The present application has the following advantages:

[0020] The three-layer composite structure design adopted in the present application realizes accurate division of functions and synergistic effect. The outer layer of the anti-scouring protective layer has an optimized material ratio and a bionic surface structure, and the compressive strength reaches 35.2 MPa, and the surface abrasion depth is only 0.8 mm after scouring at a flow rate of 3.5 m / s for 72 hours, which reduces the scouring loss by 42% compared with traditional slope protection bricks. The foamed cement structure of the middle layer of the buffer energy absorption layer effectively disperses impact energy, and significantly improves the impact resistance of the overall structure. The inner layer of the ecological functional layer provides an ideal growth environment for plant roots, and the survival rate of plants reaches 89%, and the root depth is 15 cm on average, forming an effective root soil fixation network.

[0021] The bionic surface microstructure design of the present application fully learns from the fluid mechanics principle in nature, and forms a three-dimensional flow guide system through precisely controlled micro-protrusions and flow guide grooves. The micro-protrusions are arranged in a hexagonal shape, and have an optimized parameter configuration of a height of 3 mm, a bottom diameter of 8 mm and a spacing of 12 mm, and cooperate with the grid distribution of the flow guide grooves with a width of 2 mm and a depth of 1.5 mm, so as to effectively guide the water flow direction and reduce the generation of turbulence. This bionic structure design forms an orderly water flow field on the surface of the brick, greatly reduces the shear stress of the water flow on the surface, and significantly improves the anti-scouring performance.

[0022] The present application realizes multiple technical breakthroughs in the ecological function aspect. The overall water permeability coefficient of the brick reaches 2.3*10 - 4cm / s, meeting the permeability requirements of ecological slope protection, effectively relieving the pressure of surface runoff. The water quality purification function performs excellently, with the total nitrogen removal rate reaching 63%, the total phosphorus removal rate reaching 58%, and the COD removal rate reaching 45%, providing an effective way for river water quality improvement. The inner ecological function layer creates a suitable soil environment for plant growth through scientific proportioning of biomass substrate, water-retaining agent, slow-release fertilizer and microbial agent, achieving the dual goals of engineering protection and ecological restoration.

[0023] The intelligent preparation process system developed by the present application solves the key technical problems in the traditional ecological brick preparation process. The three-cavity layered mold system realizes precise layer thickness control and material distribution, ensuring the stability of product quality. The material pretreatment technology significantly improves the interfacial bonding strength between materials through screening and cleaning of Yellow River fine sand, surface modification of straw fiber and silane coupling agent treatment of basalt fiber. The intelligent curing system realizes automated management of the curing process through the coordinated control of temperature and humidity sensors and automatic spraying devices, effectively ensuring the consistency of product performance.

[0024] The mortise and tenon connection system of the present application realizes reliable connection and good sealing between modules. The tenon is designed with a 15° inclination angle and a depth of 8mm, matched with a modified polyurethane sealant strip, with a compression rate of up to 30% and a rebound rate of more than 95%, ensuring the stability and sealing of the connection. This connection method not only simplifies the construction process, reduces the installation difficulty, but also improves the anti-deformation ability and service life of the overall structure.

[0025] The present application makes full use of local material resources such as Yellow River fine sand and straw fiber, reducing raw material costs and transportation costs. The application of biological enzyme curing agent replaces part of the chemical additives, reducing environmental pollution. The use of intelligent preparation process improves production efficiency and reduces energy consumption. Compared with traditional slope protection materials, the present application has better economic and environmental performance in the whole life cycle, providing technical support for sustainable development.

[0026] Through the above technical innovation and optimization design, the present application successfully solves the technical bottlenecks of traditional slope protection materials in terms of erosion resistance, ecological function and engineering adaptability, providing an advanced technical solution for water and soil conservation and ecological restoration projects in the Yellow River Basin and similar ecologically fragile areas. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the present application or prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only a part of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0028] Fig. 1 The overall structure of the ecological brick of the present application is shown in the figure; Fig. 2 The detailed surface biomimetic microstructure of the present application is shown in the figure; Fig. 3 The mortise and tenon connection structure of the present application is shown in the figure; Fig. 4 The preparation process flow of the present application is shown in the figure. DETAILED DESCRIPTION

[0032] The present application will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, in order to make the embodiments more detailed, the following embodiments are the best, preferred embodiments, and other alternative ways can also be used by those skilled in the art to implement some known technologies; and the accompanying drawings are only used to more specifically describe the embodiments, and are not intended to specifically limit the present application.

[0033] It should be noted that in the specification, "one embodiment", "embodiment", "exemplary embodiment", "some embodiments" and the like indicate that the described embodiments can include a specific feature, structure or property, but not necessarily every embodiment includes the specific feature, structure or property. In addition, when a specific feature, structure or property is described in combination with an embodiment, it should be within the knowledge of those skilled in the related art to realize such a feature, structure or property in combination with other embodiments, whether or not it is explicitly described.

[0034] Generally, the terms can be understood at least in part from the use in context. For example, depending at least in part on the context, the term "one or more" as used herein can be used to describe any feature, structure, or characteristic in the singular or can be used to describe combinations of features, structures, or characteristics that are combinable into one or more instances. In addition, the term "based on" can be understood as not necessarily intended to convey a set of exclusive factors, but can instead, depending at least in part on the context, allow for the existence of other factors that are not necessarily explicitly described.

[0035] Reference Figs. 1 to 4

[0036] The biomimetic multi-stage buffer ecological brick of the present application adopts a layered composite structure design, with overall dimensions of 300mm long x 200mm wide x 60mm thick, and is integrally formed by a special three-cavity mold. The preparation process includes four key steps of material pretreatment, layered pouring, biomimetic forming and intelligent curing.

[0037] The material pretreatment stage first screens and cleans the Yellow River fine sand, removing particles larger than 2 mm and organic impurities, with a clay content controlled below 3%. The straw fibers are cut to a length of 8-15 mm and soaked in a sodium hydroxide solution for 24 hours for surface modification to improve adhesion to the cement base material. Basalt fibers are surface treated with a silane coupling agent to enhance the interfacial bonding strength with the matrix. The biological enzyme curing agent needs to be mixed with an appropriate amount of water for activation 30 minutes before use to ensure that the enzyme activity is at the optimal state.

[0038] The layered pouring process uses a self-designed three-cavity layered mold system with adjustable partitions at the bottom for precise layer thickness control through hydraulic control. During the preparation of the outer anti-erosion protective layer, 105 kg of Portland cement, 75 kg of pretreated Yellow River fine sand, 9 kg of basalt fiber, 36 kg of expanded perlite, 60 kg of fly ash, 9 kg of biological enzyme curing agent, and 6 kg of anti-freezing additives are sequentially added to a forced mixer, dry mixed for 2 minutes, and then mixed with water with a water-cement ratio of 0.35, wet mixed for 5 minutes to uniformity. The pouring temperature is controlled at 15-25°C, the vibration time is 90 seconds, and the vibration frequency is 50 Hz to ensure that the material is dense and does not segregate.

[0039] The preparation of the middle buffer energy absorption layer requires special attention to the preparation process of foamed cement. Cement and water are mixed in a ratio of 1:0.4 to make a cement slurry, then foam agent is added to make foamed concrete with a density of 600-800 kg / m 3 . On this basis, 62.5 kg of pretreated straw fiber, 75 kg of ceramsite, 7.5 kg of water-absorbing resin, and 5 kg of slow-release nutrient agent are added, and the stirring time is controlled within 3 minutes to avoid the influence of foam rupture on lightweight effect. Low-frequency vibration is used during pouring, with a frequency of 25 Hz and a time of 60 seconds to ensure uniform distribution of the material while maintaining the porous structure.

[0040] The preparation process of the inner ecological functional layer is relatively complex, and the biomass base material needs to be prepared in advance. Corn straw, rice straw, and sawdust are mixed in a ratio of 2:2:1, and after crushing, fermentation, and drying, a biomass base material of 125 kg is prepared. When preparing, the biomass base material is mixed with water-retaining agent 37.5 kg, slow-release fertilizer 25 kg, microbial agent 12.5 kg, and organic fiber 50 kg in a low-speed mixer for 5 minutes, and the water content is adjusted to 35-40%. The inner layer is not vibrated and is formed by light pressing with a pressure of 0.1-0.2 MPa to ensure the formation of a loose structure suitable for plant root growth.

[0041] Bionic surface forming technology is one of the key innovations of the present application. A silica gel template is made by laser engraving technology, and the template surface has a fish scale-like micro-protrusion and a flow guide groove structure. The micro-protrusion has a height of 3 mm, a bottom diameter of 8 mm, a top diameter of 4 mm, and a pitch of 12 mm, and is arranged in a hexagonal shape. The flow guide groove has a width of 2 mm and a depth of 1.5 mm, and is arranged in a grid shape with the micro-protrusion. After the outer layer of concrete is poured and cured for 15-20 minutes, when the surface is initially cured but still plastic, the silica gel template is lightly pressed on the surface at a pressure of 0.05 MPa, and is removed slowly after being kept for 30 seconds, to form precise bionic microstructures.

[0042] The intelligent curing system integrates temperature and humidity sensors, automatic spraying devices, and environmental control equipment, and can automatically adjust the curing parameters according to the environmental conditions. The temperature in the curing room is controlled at 20±2℃, and the relative humidity is maintained at 85-95%. In the first 24 hours, continuous spraying is used for curing, with a spraying interval of 5 minutes and a duration of 30 seconds each time. In the second to seventh days, intermittent spraying is used, with spraying once an hour and a duration of 2 minutes each time. In the eighth to twenty-eighth days, the spraying is adjusted to twice a day, once in the morning and once in the evening, with a duration of 5 minutes each time. During the entire curing process, the surface temperature of the brick body is monitored, and when the temperature difference exceeds 5℃, automatic temperature equalization measures are started.

[0043] The modular connection system adopts a mortise and tenon design, and trapezoidal tenon heads and mortises are arranged around the brick body, with an inclined angle of 15° and a depth of 8 mm, and is connected by using special flexible sealing rubber strips. The sealing rubber strip is made of modified polyurethane material, has good elasticity and aging resistance, and has a compression rate of up to 30% and a rebound rate of more than 95%. During installation, the sealing rubber strip is first embedded in the mortise, and then the adjacent brick bodies are butted, and the tenon head is completely inserted into the mortise by tapping to form a stable connection.

[0044] Example 1: Performance verification of standard ecological bricks

[0045] According to the above implementation, 100 standard ecological bricks were prepared for performance verification test. After the brick body was formed, it was cured for 28 days according to the standard, and then various performance tests were carried out. The compressive strength test results show that the average compressive strength reaches 35.2 MPa, and the coefficient of variation is only 6.8%, indicating that the preparation process is stable and reliable. The scouring resistance test uses a water tank scouring test, with a water flow speed of 3.5 m / s and a scouring time of 72 hours, and the surface wear depth of the brick body is only 0.8 mm, which reduces the scouring loss by 42% compared with traditional slope protection bricks.

[0046] The water permeability test shows that the overall water permeability coefficient of the brick body is 2.3×10 -4cm / s, which meets the permeability requirement of ecological slope protection. The plant planting test selects alkali grass and tamarisk suitable for growth in the Yellow River basin for planting. The plant survival rate reaches 89% after 60 days of planting, the root depth is 15 cm on average, and the root soil network is effectively formed. The water quality purification effect test uses test water simulating the water quality of the Yellow River, and the total nitrogen removal rate reaches 63%, the total phosphorus removal rate reaches 58%, and the COD removal rate reaches 45%, with significant purification effect.

[0047] Example Two: Preparation and Application of Reinforced Ecological Brick

[0048] A reinforced ecological brick is developed for the special needs of the high-erosion-intensity area in the lower reaches of the Yellow River. On the basis of the standard formula, the content of basalt fiber in the outer anti-erosion protective layer is increased to 5%, and 2% of steel fiber reinforcing material is added. At the same time, a guide ridge is added to the surface biomimetic structure, with a height of 5 mm and a width of 3 mm, forming a three-dimensional guide system with the guide groove. The compressive strength of the reinforced ecological brick is increased to 42.8 MPa, and the anti-erosion performance is improved by 33% compared with the standard type, with a surface wear depth of only 1.2 mm after 96 hours of erosion at a flow rate of 4.5 m / s.

[0049] In actual engineering application, the reinforced ecological brick is applied to a key protection area in the lower reaches of the Yellow River, with a laying area of 3000 square meters. After a flood season, the slope protection structure is intact, the vegetation coverage rate reaches 75%, and the soil and water loss is effectively controlled, achieving good protection effect and ecological benefit.

[0050] Example Three: Optimization Design of Lightweight Ecological Brick

[0051] To meet the strict requirements of weight for slope protection engineering in the upper reaches of the Yellow River, a lightweight ecological brick is developed. By optimizing the middle layer formula, the density of foamed cement is reduced to 500 kg / m 3 , and all the ceramsite is replaced by super-light ceramsite, with the overall density of the brick body controlled at 1.8 g / cm 3 . While maintaining the basic mechanical properties, the lightweight ecological brick reduces the weight by 25% compared with the standard type, significantly reducing transportation and construction costs. Field application shows that the lightweight ecological brick performs well in mountain slope protection engineering with a larger slope, is easy to install, and is well combined with the foundation, providing an ideal technical solution for soil and water conservation engineering in mountainous areas.

[0052] Through the examples of three different types of ecological bricks, the feasibility and superiority of the technical scheme of the invention are fully proved, which can be flexibly adjusted according to different engineering needs and has good popularization and application prospect.

[0053] The present application encompasses any alternatives, modifications, equivalent methods and solutions made to the essence and scope of the present application. In order to make the public have a thorough understanding of the present application, specific details are described in the following preferred embodiments of the present application, and the present application can also be fully understood without the description of these details to those skilled in the art. In addition, in order to avoid unnecessary confusion to the essence of the present application, well-known methods, processes, procedures, elements and circuits, etc. are not described in detail.

[0054] The above is only the preferred embodiment of the present application, and it should be pointed out that for ordinary skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can also be made, which should be considered as the protection scope of the present application.

Claims

1. An eco-friendly brick, characterized in that, The ecological brick comprises an outer anti-erosion protective layer, a middle buffer and energy-absorbing layer, and an inner ecological functional layer arranged sequentially from the outside to the inside. The overall dimensions of the ecological brick are 300mm long × 200mm wide × 60mm thick. The surface of the outer anti-erosion protective layer is provided with a biomimetic microstructure, including micro-protrusions with a height of 3mm, a bottom diameter of 8mm, a top diameter of 4mm, and a spacing of 12mm. The micro-protrusions are arranged in a hexagonal pattern, and there are guide grooves with a width of 2mm and a depth of 1.5mm between the micro-protrusions.

2. The eco-brick according to claim 1, characterized in that, The outer erosion-resistant protective layer is made of the following raw materials in the following weight ratio: 105 parts silicate cement, 75 parts pretreated Yellow River fine sand, 9 parts basalt fiber, 36 parts expanded perlite, 60 parts fly ash, 9 parts bio-enzyme curing agent, and 6 parts antifreeze additive, with a water-binder ratio of 0.

35.

3. The eco-brick according to claim 1, characterized in that, The middle buffer energy-absorbing layer comprises a density of 600-800 kg / m³. 3 The mixture consists of foamed cement, 62.5 parts of pretreated straw fiber, 75 parts of ceramsite, 7.5 parts of water-absorbing resin, and 5 parts of slow-release nutrient agent.

4. The eco-brick according to claim 1, characterized in that, The inner ecological functional layer comprises 125 parts of biomass substrate, 37.5 parts of water-retaining agent, 25 parts of slow-release fertilizer, 12.5 parts of microbial agent, and 50 parts of organic fiber. The biomass substrate is made by mixing corn stalks, rice straw, and sawdust in a weight ratio of 2:2:

1.

5. The eco-brick according to claim 1, characterized in that, The eco-brick is equipped with trapezoidal tenons and mortises around its perimeter. The tenons are inclined at an angle of 15° and have a depth of 8mm. Modified polyurethane sealing strips are installed in the mortises.

6. A method for preparing the eco-brick according to any one of claims 1-5, characterized in that, Includes the following steps: Material pretreatment: The fine sand from the Yellow River is screened and washed to remove particles larger than 2mm, and the mud content is controlled to be below 3%. The straw fibers were cut to a length of 8-15 mm and soaked in sodium hydroxide solution for 24 hours; the basalt fibers were then surface-treated with a silane coupling agent. Layered casting: A three-cavity layered mold is used to prepare each layer of material according to the formula and cast them in layers. The outer layer is vibrated for 90 seconds at a frequency of 50Hz, the middle layer is vibrated at a frequency of 25Hz for 60 seconds, and the inner layer is formed by light pressure with the pressure controlled at 0.1-0.2MPa. Biomimetic molding: 15-20 minutes after the outer concrete is poured, a silicone template with a biomimetic microstructure is lightly pressed onto the surface with a pressure of 0.05MPa for 30 seconds and then removed. Intelligent maintenance: Control the temperature of the maintenance room to 20±2℃ and the relative humidity to 85-95%. Spray maintenance is carried out continuously for the first 24 hours, intermittent spraying is carried out from the 2nd to the 7th day, and spraying is carried out twice a day from the 8th to the 28th day.

7. The preparation method according to claim 6, characterized in that, During the preparation of the outer anti-erosion protective layer, the temperature of the mold is controlled at 15-25℃. The raw materials are added to the forced mixer in sequence and dry-mixed for 2 minutes, and then the mixing water is added and wet-mixed for 5 minutes.

8. The preparation method according to claim 6, characterized in that, When preparing the foamed cement for the middle buffer energy-absorbing layer, cement and water are mixed at a weight ratio of 1:0.4 to form a cement slurry, and then a foaming agent is added. The stirring time is controlled within 3 minutes.

9. The preparation method according to claim 6, characterized in that, The biomimetic microstructure silicone template is made using laser engraving technology, and the micro-protrusions on the template surface and the guide grooves form a grid-like distribution.

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