Protective coating treating agent, protective coating treating fluid, modified forage as well as preparation method and application of modified forage

Abstract

The invention discloses a protective coating treating agent, a protective coating treating fluid, modified forage and a preparation method and application thereof, and belongs to the technical field of ecological engineering. The protective coating treating agent comprises a first component, a second component and a third component in a mass ratio of 10: (0.5-2.5): (1-3), the first component is a natural polymer film-forming material; the second component is a plant-derived functional anti-degradation agent; and the third component is a natural mineral particle reinforcing agent. The protective coating treating agent containing the components is prepared into a protective coating treating fluid, and then the protective coating treating fluid is coated on the surface of forage to form a protective coating, so that the aging resistance of the straw checks in environments of high temperature, strong ultraviolet rays, sand erosion and microbial erosion can be remarkably improved, the service life of the straw checks is prolonged, and the service life of the straw checks is prolonged. And the operation and maintenance cost of ecological restoration engineering is reduced. The straw checkerboard with the protective coating can be widely applied to ecological engineering construction such as treatment of railways, highways and sand source areas in arid and windy sand areas.

Description

Technical Field

[0001] The present invention relates to the field of ecological engineering technology, and in particular to a protective coating treatment agent, a protective coating treatment liquid, a modified grass material, and a preparation method and application thereof. Background Art

[0002] As a traditional mechanical sand fixation measure known for its economical feasibility, simple structure, convenient construction, and strong adaptability, straw grid sand barriers are widely used in desert and semi-desert areas subject to severe wind and sand hazards. They play a particularly important role in ecologically fragile areas such as the Gobi Desert, the edges of shifting sand dunes, and wind-eroded farmland. The basic structure of a straw grid consists of evenly laid horizontally staggered sections of cut biomass straw (such as wheat straw or rice straw) on the sand surface, forming a regular grid structure. The common size is 1 m x 1 m, with each bundle approximately 30 cm to 40 cm long and embedded 15 cm to 20 cm deep in the sand to prevent it from being lifted or moved by wind. Once laid, the straw grid forms a low, evenly spaced, wind-blocking and turbulent grid array. This effectively reduces near-surface wind speeds, reduces the probability of sand particles being mobilized, and ultimately stabilizes sand dunes, mitigates wind erosion, and promotes the restoration of natural vegetation.

[0003] The schematic diagram of the typical grass grid sand barrier structure is as follows Figure 1 As shown, the grass is laid in a crisscross pattern on the surface sand, with some bundles exposed above the ground and others buried in the sand, anchoring the overall pattern. The exposed sections of the grass are directly exposed to the environment, subject to the long-term effects of sunlight, high temperatures, alternating wet and dry seasons, wind erosion, and microorganisms. Meanwhile, the buried sections, covered by sand, act as a buffer between temperature and humidity, and shielded from sunlight, resulting in a relatively slow degradation process. Consequently, deterioration of the grass grid is concentrated in the exposed upper section, becoming the primary weak link in determining the sustainability of its protective effectiveness.

[0004] At present, problems such as rapid decay of grass grid sand barriers during their functional period, frequent manual replacement, and large grass source consumption are becoming increasingly prominent. The exposed parts of commonly used grass grids weather, powder, and even break on a large scale within 1 to 2 years, causing the overall structure of the grass grid to degrade and fail, and its service life usually does not exceed 2 to 3 years.

[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 protective coating treatment agent, a protective coating treatment liquid, a modified grass material and a preparation method and application thereof, so as to solve or improve the above-mentioned technical problems.

[0007] The present invention can be implemented like this:

[0008] In a first aspect, the present invention provides a protective coating treatment agent, comprising a first component, a second component, and a third component in a mass ratio of 10:(0.5-2.5):(1-3);

[0009] Among them, the first component is a natural polymer film-forming material; the second component is a plant-derived functional antidegradant; and the third component is a natural mineral particle enhancer.

[0010] In an optional embodiment, the natural polymer film-forming material includes at least one of chitosan, sodium alginate, gelatin and sodium carboxymethyl cellulose.

[0011] In an optional embodiment, the natural polymer film-forming material includes chitosan, sodium alginate and gelatin.

[0012] In an alternative embodiment, the plant-derived functional antidegradant includes natural polyphenolic compounds.

[0013] In an alternative embodiment, the plant-derived functional antidegradant includes at least one of tannic acid, tea polyphenols, naringenin, and eugenol.

[0014] In an alternative embodiment, the plant-derived functional antidegradants include tannic acid, tea polyphenols and naringenin.

[0015] In an optional embodiment, the natural mineral particle reinforcing agent includes at least one of attapulgite, bentonite, diatomaceous earth and biochar powder.

[0016] In an alternative embodiment, the natural mineral particulate reinforcement includes attapulgite and biochar powder.

[0017] In an alternative embodiment, the particle size of the biochar powder does not exceed 5 μm.

[0018] In a second aspect, the present invention provides a protective coating treatment liquid, which includes a solvent and the protective coating treatment agent of any one of the aforementioned embodiments.

[0019] In an optional embodiment, each 100 mL of the protective coating treatment liquid contains 2 g to 6 g of the protective coating treatment agent;

[0020] In an optional embodiment, the protective coating treatment solution further includes an adjuvant.

[0021] In an alternative embodiment, the adjuvant comprises a dispersant.

[0022] In an optional embodiment, the mass of the dispersant is 0.05% to 0.15% of the protective coating treatment liquid.

[0023] In alternative embodiments, the dispersant comprises locust bean gum or a non-toxic nonionic emulsifier.

[0024] In an alternative embodiment, the non-toxic nonionic emulsifier comprises glycerin.

[0025] In an optional embodiment, the pH value of the protective coating treatment solution is 5.5-6.5.

[0026] In a third aspect, the present invention provides a method for preparing a protective coating treatment liquid as described in the aforementioned embodiment, comprising the following steps: mixing predetermined components.

[0027] In an alternative embodiment, the first component is mixed with water, and then the second component is added and mixed, and then the third component is added and mixed, and then the auxiliary agent is added and mixed.

[0028] In a fourth aspect, the present invention provides a use of the protective coating treatment agent of any one of the aforementioned embodiments or the protective coating treatment liquid of the aforementioned embodiments in forage.

[0029] In an alternative embodiment, a protective coating treatment agent or a protective coating treatment fluid is used to form a protective coating on the surface of the forage material.

[0030] In a fifth aspect, the present invention provides a modified grass material, comprising grass material and a protective coating on the surface of the grass material;

[0031] The protective coating layer is formed from the protective coating treatment agent of any one of the aforementioned embodiments or the protective coating treatment liquid of the aforementioned embodiments.

[0032] In an optional embodiment, the thickness of the protective coating is 20 μm to 60 μm.

[0033] In an optional embodiment, when the modified straw material is bent at an angle ≥ 90°, the protective coating does not break.

[0034] In a sixth aspect, the present invention provides a method for preparing the modified grass material of the aforementioned embodiment, comprising the following steps: coating the surface of the grass material with a coating liquid containing a protective coating treatment agent, and then drying.

[0035] In an optional embodiment, coating includes a dipping method or a spraying method, and / or drying includes natural drying or hot air drying.

[0036] In an optional embodiment, the mass ratio of the grass material to the coating liquid is 1.5:1 to 2:1.

[0037] In an optional embodiment, the immersion time is 2 min to 5 min.

[0038] In an optional embodiment, the spraying times are 2 to 3 times.

[0039] In an optional embodiment, the hot air drying temperature is 40° C. to 50° C., and the hot air drying time is 12 hours to 24 hours.

[0040] In a seventh aspect, the present invention provides a straw checkerboard, which is woven from the modified straw material of the aforementioned embodiment.

[0041] In an alternative embodiment, grass grids are used for laying on sandy ground.

[0042] In an optional embodiment, the grass grid is buried in the sand to a depth of 15 cm to 20 cm.

[0043] In an optional embodiment, the grass grid is used for railways, highway slopes, wind and sand protection forests or comprehensive desertification control projects.

[0044] The beneficial effects of the present invention include:

[0045] The present invention provides a protective coating treatment agent comprising a first component, a second component and a third component in a mass ratio of 10: (0.5-2.5): (1-3), wherein the first component is a natural polymer film-forming material; the second component is a functional antidegradant derived from plants; and the third component is a natural mineral particle enhancer. The third component can cooperate with the first component to improve the adhesion and impact resistance of the protective coating; the second component can inhibit microbial invasion and delay biodegradation. The protective coating treatment agent as a whole can improve the aging resistance of grass in high temperature, strong ultraviolet rays, wind and sand erosion and microbial erosion environments, which is beneficial to extend the service life of grass grids and reduce the operation and maintenance costs of ecological restoration projects. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] 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.

[0047] Figure 1 This is a schematic diagram of a grass grid paving structure in the prior art;

[0048] Figure 2 This is a schematic diagram of the state of the grass grid formed by the modified grass material obtained in Example 1 in Application Example ① after being exposed for 2 years;

[0049] Figure 3 This is a schematic diagram of the state of the traditional grass grid in application example ① after being exposed for 2 years. DETAILED DESCRIPTION

[0050] 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.

[0051] The protective coating treatment agent, protective coating treatment liquid, modified grass material, and preparation method and application thereof provided by the present invention are described in detail below.

[0052] The present invention provides a protective coating treatment agent comprising a first component, a second component, and a third component in a mass ratio of 10:(0.5-2.5):(1-3). The first component is a natural polymer film-forming material, the second component is a plant-derived functional antidegradant, and the third component is a natural mineral particle enhancer.

[0053] In some optional embodiments, the mass ratio of the first component to the second component can be 10:0.5, 10:0.8, 10:1, 10:1.2, 10:1.5, 10:1.8, 10:2, 10:2.2 or 10:2.5, etc., or other values ​​within the range of 10:(0.5-2.5). If the amount of the second component is too small, it will not be conducive to improving the resistance of the protective coating to microbial erosion and ultraviolet degradation, resulting in the modified grass material still being prone to discoloration, softening or biodegradation under high temperature, strong light or humid conditions; if the amount of the second component is too much, it will easily lead to the protective coating being too thick or uneven, thereby affecting its adhesion and flexibility, and may even inhibit the film-forming properties of the first component, reducing the overall mechanical strength and stability of the protective coating.

[0054] The mass ratio of the first component to the third component can be 10:1, 10:1.2, 10:1.5, 10:1.8, 10:2, 10:2.2, 10:2.5, 10:2.8 or 10:3, etc., or other values ​​within the range of 10:(1-3). If the amount of the third component is too small, it will not be conducive to enhancing the mechanical strength and adhesion performance of the protective coating, and may cause the coating to crack or fall off under dry conditions or long-term wind and sand erosion, thereby reducing the overall protective effect; if the amount of the third component is too large, it will easily lead to particle accumulation and poor dispersion of the coating system, thereby affecting the uniformity and density of the film formation, and even forming particle flocs on the surface of the grass, affecting the appearance and actual adhesion performance.

[0055] In some optional embodiments, the natural polymer film-forming material may illustratively include at least one of chitosan, sodium alginate, gelatin, and sodium carboxymethyl cellulose. These substances can form a continuous, flexible, and highly adherent coating on the surface of the grass fiber, providing basic vapor barrier and structural encapsulation functions while enhancing the surface's resistance to mechanical wear. These substances also exhibit good biocompatibility and degradability. In some specific embodiments, the natural polymer film-forming material may include chitosan, sodium alginate, and gelatin simultaneously, with the mass ratio of these three being 5:3:2.

[0056] In some optional embodiments, the plant-derived functional antidegradant may illustratively include natural polyphenolic compounds, such as at least one of tannic acid, tea polyphenols, naringenin, and eugenol. These substances can effectively inhibit the colonization and growth of typical decomposing fungi such as Penicillium, Aspergillus, and Fusarium on the surface of grass materials, delaying the biodegradation process and protecting against free radical oxidation-induced cellulose structural fracture. In some specific embodiments, the plant-derived functional antidegradant may include tannic acid, tea polyphenols, and naringenin at a mass ratio of 1:0.5:0.5.

[0057] In some optional embodiments, the natural mineral particle reinforcement may illustratively include at least one of attapulgite, bentonite, diatomaceous earth, and biochar powder. The natural mineral particle reinforcement in the present invention can enhance the heat resistance, UV aging resistance, and surface roughness of the protective coating through a triple "filling-adsorption-shielding" mechanism, improving the bonding strength with the grass fibers and effectively combating wind erosion and shedding in high wind speeds. In some specific embodiments, the natural mineral particle reinforcement may include both attapulgite and biochar powder, with the mass ratio of the two being 2:1.

[0058] In some optional embodiments, the particle size of the biochar powder does not exceed 5 μm, for example, it can be 0.1 μm to 5 μm, such as 0.1 μm, 0.5 μm, 1 μm, 1.5 μm, 2 μm, 2.5 μm, 3 μm, 3.5 μm, 4 μm, 4.5 μm or 5 μm, etc., or it can be other values ​​within the range of 0.1 μm to 5 μm.

[0059] If the particle size of biochar powder is larger than 5μm, it will not be conducive to its uniform dispersion in the polymer film-forming material, and it is easy to agglomerate or settle, resulting in a decrease in the density of the coating and weakened adhesion, affecting its reinforcement, UV protection and water retention functions; at the same time, a larger particle size may also damage the surface smoothness of the coating, reduce its ability to form a continuous film layer on the surface of the grass, and affect the overall protective effect.

[0060] Continuing with the above, the protective coating treatment agent provided by the present invention comprises a third component that works in conjunction with the first component to enhance the protective coating's adhesion and impact resistance, while the second component inhibits microbial invasion and slows biodegradation. The protective coating treatment agent as a whole improves the aging resistance of grass material in environments subject to high temperatures, strong UV rays, wind and sand erosion, and microbial attack. This helps extend the service life of grass grids woven from grass material and reduces the operational and maintenance costs of ecological restoration projects.

[0061] Correspondingly, the present invention also provides a protective coating treatment liquid, which includes a solvent and the above-mentioned protective coating treatment agent.

[0062] In some optional embodiments, every 100 mL of the protective coating treatment liquid may contain 2 g to 6 g (such as 2 g, 2.5 g, 3 g, 3.5 g, 4 g, 4.5 g, 5 g, 5.5 g or 6 g, etc.) of the protective coating treatment agent.

[0063] Furthermore, the protective coating treatment liquid may also include an auxiliary agent. Optionally, the auxiliary agent may include a dispersant. In addition, an anti-ultraviolet agent may be added as needed.

[0064] In some optional embodiments, the mass of the dispersant can be 0.05% to 0.15% of the protective coating treatment solution, such as 0.05%, 0.08%, 0.1%, 0.12%, or 0.15%, or other values ​​within the range of 0.05% to 0.15%. Adding the above amount of dispersant can help improve the permeability and adsorption of the treatment solution into the forage.

[0065] In some optional embodiments, the dispersant may include locust bean gum or a non-toxic non-ionic emulsifier (such as glycerol).

[0066] In some optional embodiments, the pH value of the protective coating treatment solution is 5.5-6.5, such as 5.5, 5.6, 5.7, 5.8, 5.9, 6.0, 6.1, 6.2, 6.3, 6.4 or 6.5, or other values ​​within the range of 5.5-6.5.

[0067] If the pH value of the protective coating treatment liquid is lower than 5.5, it is not conducive to the structural stability of natural polymer film-forming materials (such as chitosan, gelatin, etc.), which may cause them to denature or coagulate under acidic conditions, affecting the film uniformity and adhesion performance; at the same time, it may also inhibit the active expression of functional anti-degradation components from plant sources (such as tea polyphenols, tannic acid); if the pH value of the protective coating treatment liquid is higher than 6.5, it is not conducive to the synergistic stability of the functional components in the protective agent, and it is easy to cause flocculation and sedimentation of natural mineral particle enhancers, affecting the dispersion and storage stability of the system, and thus affecting the actual use effect and coating quality of the protective coating.

[0068] Correspondingly, the present invention also provides a method for preparing the above-mentioned protective coating treatment liquid, comprising the following steps: mixing preset components.

[0069] In some optional embodiments, the first component may be mixed with water, and then the second component is added and mixed, and then the third component is added and mixed, and then the auxiliary agent is added and mixed.

[0070] In specific operations, the first component can be added to a solvent (such as distilled water), and magnetically stirred at 65°C to 75°C (the stirring time can be 25min to 35min) to dissolve to form a uniform solution; then the second component is added and stirred (the stirring time can be 10min to 20min) to fully dissolve it without obvious precipitation; then the third component is slowly added and mixed using high-speed shearing or ultrasonic dispersion (the mixing time can be 15min to 25min) to ensure that the inorganic particles are evenly suspended; then the auxiliary agent is added, stirred evenly, and the pH value of the system is adjusted to 5.5 to 6.5, allowed to stand for degassing, filtered to remove impurities and set aside.

[0071] In addition, the present invention also provides a use of the above-mentioned protective coating treatment agent or protective coating treatment liquid in forage.

[0072] For example, the protective coating treatment agent or protective coating treatment liquid described above can be used to form a protective coating on the surface of grass material.

[0073] Correspondingly, the present invention also provides a modified forage, which includes forage and a protective coating on the surface of the forage; the protective coating is formed by the above-mentioned protective coating treatment agent or protective coating treatment liquid.

[0074] The grass material may be wheat straw or rice straw, for example. The length of the grass material may be 30 cm to 40 cm, such as 30 cm, 35 cm or 40 cm.

[0075] The moisture content of the forage can be between 12% and 15%, such as 12%, 13%, 14%, or 15%. This moisture content can be achieved through natural air-drying or low-temperature drying. By controlling the moisture content of the forage to between 12% and 15%, the risk of fiber swelling due to water absorption can be reduced, the coating's adsorption efficiency can be improved, and mold and deterioration can be prevented during processing.

[0076] The thickness of the protective coating may be 20 μm to 60 μm, such as 20 μm, 25 μm, 30 μm, 35 μm, 40 μm, 45 μm, 50 μm, 55 μm or 60 μm, or other values ​​within the range of 20 μm to 60 μm.

[0077] Keeping the protective coating thickness within the above range allows the modified straw material to maintain good flexibility while not affecting the embedding process and the weaving of the straw grid. A protective coating thickness less than 20 μm will result in poor protection. A coating thickness exceeding 60 μm will reduce the flexibility of the modified straw material and affect embedding and weaving.

[0078] In some optional embodiments, when the bending angle of the modified grass material provided by the present invention is ≥90°, the protective coating does not break.

[0079] In addition, the present invention also provides a method for preparing the modified grass material, comprising the following steps: coating the surface of the grass material with a coating liquid containing a protective coating treatment agent, and then drying.

[0080] The mass ratio of the fodder to the coating liquid can be between 1.5:1 and 2:1, such as 1.5:1, 1.6:1, 1.7:1, 1.8:1, 1.9:1, or 2:1, or other values ​​within the range of 1.5:1 to 2:1. Using too little coating liquid will reduce the actual amount of active ingredients in the protective coating, thereby reducing the protective effect. Using too much coating liquid will not be conducive to controlling the thickness and drying rate of the protective coating, and may cause liquid accumulation, dripping, or clumping on the surface of the fodder, reducing the density and adhesion of the protective coating, and increasing drying energy consumption and preparation costs.

[0081] In some optional embodiments, coating can include dipping or spraying. The dipping time can be 2 to 5 minutes, such as 2, 3, 4, or 5 minutes. This allows the coating liquid to fully penetrate the surface fibers and evenly coat them. Spraying is suitable for rapid on-site batch processing, and the number of spraying passes can be 2 to 3.

[0082] In some optional embodiments, drying may include natural drying or hot air drying. The natural drying time may be 48 hours. The hot air drying temperature may be 40°C to 50°C (e.g., 40°C, 45°C, or 50°C), and the hot air drying time may be 12 hours to 24 hours (e.g., 12 hours, 16 hours, 20 hours, or 24 hours).

[0083] Through the above drying treatment, the protective coating can be made into a dense film and firmly adhered to the surface of the grass.

[0084] In addition, the present invention also provides a straw grid, which is woven from the modified straw material.

[0085] In some optional embodiments, the grass grid is used for laying on sandy land, and can be used, by way of example but not limitation, for railways, road slopes, wind and sand protection forests, or comprehensive desertification control projects.

[0086] The grass grid can be buried at a depth of 15 cm to 20 cm in the sand, such as 15 cm, 16 cm, 17 cm, 18 cm, 19 cm or 20 cm. When used, a 1 m × 1 m grid structure can be used to cross-bury 15 cm to 20 cm.

[0087] Continuing from the above, the present invention constructs a ternary composite protection system of "natural polymers-plant active substances-inorganic particles" and combines it with a highly adaptable impregnation / spraying-drying process, which can effectively extend the protection life of grass grid materials in arid and sandy environments from the current 2 to 3 years to more than 5 years. It has significant ecological engineering application value and technology promotion prospects.

[0088] The features and performance of the present invention are further described in detail below with reference to the embodiments.

[0089] Example 1

[0090] This embodiment provides a modified grass material, the preparation method of which includes:

[0091] S1: Prepare raw materials.

[0092] Forage: Use naturally air-dried wheat straw (moisture content 12% to 15%) that is free of mildew and rot, cut into 35 cm lengths, and bundle into straw bundles.

[0093] The first component: chitosan (food grade) 5g, sodium alginate 3g and gelatin 2g.

[0094] The second component: 1g tannic acid, 0.5g tea polyphenols and 0.5g naringenin.

[0095] The third component: 2 g of attapulgite and 1 g of biochar powder (particle size ≤ 2 μm).

[0096] Additives: locust bean gum, glycerin.

[0097] Solvent: distilled water.

[0098] S2: preparing a protective coating treatment solution.

[0099] Add 500 mL of distilled water to a three-necked flask and stir magnetically at 70° C.; add 10 g of the first component and stir for 30 minutes until it is completely dissolved to form a uniform viscous solution; add 2 g of the above-mentioned second component and continue stirring for 15 minutes to fully dissolve it without obvious precipitation; slowly add 3 g of the above-mentioned third component and treat it using a high-speed shear disperser for 20 minutes to ensure uniform suspension of inorganic particles; add glycerol (0.05 wt% of the protective coating treatment liquid) and locust bean gum (0.1 wt% of the protective coating treatment liquid), stir evenly, adjust the pH value of the system to 6.0, let it stand to degas, filter and remove impurities, and set aside.

[0100] S3: preparing modified forage.

[0101] At a mass ratio of 2:1, the wheat straw bundles from S1 were immersed in the protective coating treatment solution from S2 for 2 minutes, flipping the bundles to ensure uniform coating. The treated bundles were then dried in a hot air oven at 50°C for 24 hours to cure. After curing, a dense, flexible protective coating with a thickness of 50 μm was formed on the bundles, which remained intact even at a 90° bend.

[0102] Example 2

[0103] The difference between this embodiment and embodiment 1 is that the second component is only 0.5 g of tea polyphenols.

[0104] Example 3

[0105] The difference between this embodiment and embodiment 1 is that the second component contains 1 g of tannic acid, 0.5 g of tea polyphenols, 0.5 g of naringenin and 0.5 g of eugenol.

[0106] Example 4

[0107] The difference between this embodiment and embodiment 1 is that the third component is only 1 g of biochar powder.

[0108] Example 5

[0109] The difference between this embodiment and embodiment 1 is that the third component comprises 2 g of bentonite and 1 g of diatomaceous earth.

[0110] Example 6

[0111] The difference between this embodiment and embodiment 1 is that: 5 g of chitosan (food grade), 2 g of sodium alginate, 2 g of gelatin and 1 g of carboxymethyl cellulose.

[0112] Example 7

[0113] The difference between this embodiment and embodiment 1 is that the volume of distilled water is reduced to 250 mL so that every 100 mL of the protective coating treatment liquid contains 6 g of the protective coating treatment agent.

[0114] Example 8

[0115] The difference between this embodiment and embodiment 1 is that the pH value of the protective coating treatment liquid is 5.5.

[0116] Example 9

[0117] The difference between this embodiment and embodiment 1 is that the pH value of the protective coating treatment liquid is 6.5.

[0118] Example 10

[0119] The difference between this embodiment and embodiment 1 is that the mass ratio of the grass material to the coating liquid is 2:1.

[0120] Example 11

[0121] The difference between this embodiment and embodiment 1 is that the coating method is replaced by spraying with a low-pressure spray device, and the spraying is performed three times.

[0122] Example 12

[0123] The difference between this embodiment and embodiment 1 is that the drying method is replaced by natural drying, and the natural drying time is 48 hours.

[0124] Comparative Example 1

[0125] The difference between this comparative example and Example 1 is that the second component contains 0.2 g of tannic acid, 0.1 g of tea polyphenols, and 0.1 g of naringenin.

[0126] Comparative Example 2

[0127] The difference between this comparative example and Example 1 is that the second component contains 1 g of tannic acid, 1 g of tea polyphenols, and 1 g of naringenin.

[0128] Comparative Example 3

[0129] The difference between this comparative example and Example 1 is that the third component comprises 0.2 g of attapulgite and 0.5 g of biochar powder.

[0130] Comparative Example 4

[0131] The difference between this comparative example and Example 1 is that the third component comprises 2 g of attapulgite and 2 g of biochar powder.

[0132] Comparative Example 5

[0133] The difference between this comparative example and Example 1 is that the second component is not contained.

[0134] Comparative Example 6

[0135] The difference between this comparative example and Example 1 is that the third component is not contained.

[0136] Comparative Example 7

[0137] The difference between this comparative example and Example 1 is that the first component and the second component are not contained.

[0138] Comparative Example 8

[0139] The difference between this comparative example and Example 1 is that the particle size of the biochar powder is 10 μm.

[0140] Comparative Example 9

[0141] The difference between this comparative example and Example 1 is that the amount of distilled water is increased so that every 100 mL of the protective coating treatment liquid contains 1 g of the protective coating treatment agent.

[0142] Comparative Example 10

[0143] The difference between this comparative example and Example 1 is that the amount of distilled water is reduced so that 8 g of the protective coating treatment agent is contained in every 100 mL of the protective coating treatment liquid.

[0144] Comparative Example 11

[0145] The difference between this comparative example and Example 1 is that the pH value of the protective coating treatment liquid is 5.

[0146] Comparative Example 12

[0147] The difference between this comparative example and Example 1 is that the pH value of the protective coating treatment liquid is 7.

[0148] Comparative Example 13

[0149] The difference between this comparative example and Example 1 is that the thickness of the protective coating is 10 μm.

[0150] Comparative Example 14

[0151] The difference between this comparative example and Example 1 is that the thickness of the protective coating is 100 μm.

[0152] Comparative Example 15

[0153] The difference between this comparative example and Example 1 is that the mass ratio of the grass material to the coating liquid is 1:1.

[0154] Comparative Example 16

[0155] The difference between this comparative example and Example 1 is that the mass ratio of the grass material to the coating liquid is 3:1.

[0156] Application Examples

[0157] ① Taking the modified grass material obtained in Example 1 as an example, it was used for grass grid weaving construction: according to the grid specification of 1m×1m, it was staggered and laid on the sand surface, and the embedding depth of a single bundle was 15cm~20cm; the amount of grass per mu remained unchanged, and the construction method was the same as that of the traditional grass grid. The results are shown in Table 1. The state of the grass grid after exposure for 2 years is as follows: Figure 2 and Figure 3 shown.

[0158] Table 1 Comparison results

[0159] project Traditional grass grid Grass grid corresponding to Example 1 Initial mass (g) 100 100 Retention rate after 2 years of exposure (%) ＜35 ＞70 Surface mildew occurrence time 6 months >18 months Visible fracture rate ＞50％ ＜10％ On-site replacement frequency (year) Once every two years No need to replace within 5 years

[0160] It can be seen from Table 1 that the straw grids woven from straw protected by the protective coating provided in Example 1 can serve for more than 5 years under natural conditions in the wild, maintaining stable wind erosion resistance and sand fixation functions.

[0161] ②. The modified grass materials of Examples 2 to 12 and Comparative Examples 1 to 16 were tested for their effectiveness in grass grid applications under the same conditions as in ① above. The results are shown in Table 2.

[0162] Table 2 Comparison results

[0163]

[0164]

[0165] Note: "Retention rate" is the percentage of the remaining mass of the modified straw relative to the initial mass; "Surface mildew occurrence time" is the number of weeks of outdoor exposure required for visible mildew to first appear; "Visible breakage rate" is the proportion of broken straw bundles in the sample; "Replacement frequency" is derived from the statistics of the operation and maintenance cycle of typical sand barrier projects.

[0166] From Table 1 and Table 2, it can be seen that the modified grass materials provided by Examples 1 to 10 of the present invention have better weather resistance, corrosion resistance and resistance to microbial erosion than the modified grass materials provided by Comparative Examples 1 to 16.

[0167] The composition of the protective coating treatment agent, the content of the protective coating treatment agent in the protective coating treatment liquid, the pH value of the protective coating treatment liquid, the thickness of the protective coating, the mass ratio of grass material to the coating liquid, etc. will all affect the effect of the grass grid. If the above conditions are not set properly, the grass grid will rot and weather quickly, and its service life will be greatly shortened.

[0168] In summary, this invention addresses the core issues of traditional straw grid sand barriers in arid and sandy areas, namely, short service life, rapid decay and weathering, and high maintenance costs. By providing a modified straw material with a protective coating, this material significantly improves its aging resistance and environmental adaptability. Compared to existing untreated natural straw grids, the modified straw material provided by this invention offers significant advantages in terms of structural protection, degradation rate suppression, ecological safety, and adaptability for widespread adoption, including:

[0169] (1) From the perspective of material durability, traditional straw checkers use natural plant fibers (such as wheat straw and rice straw) without any surface treatment. The structural components are mainly cellulose and hemicellulose. They are very susceptible to fracture, pulverization and biodegradation under the combined effects of high temperature, strong ultraviolet radiation, wind and sand abrasion, and microbial erosion, resulting in serious decay and failure within 2 to 3 years. The present invention constructs a composite coating composed of natural polymers such as chitosan / gelatin, plant polyphenol antibacterial agents, and micro-nano mineral particles such as attapulgite. This forms a continuous, dense, and flexible protective interface on the surface of the straw material, which has good air permeability and adhesion. It not only effectively blocks water vapor penetration and oxygen intrusion, but also improves the structure's resistance to ultraviolet radiation, thermal oxidation, and wind erosion, greatly delaying the degradation process of the material surface.

[0170] (2) From the perspective of biodegradation prevention and control mechanism, the natural antibacterial factors of polyphenols such as tannic acid and tea polyphenols introduced in the present invention have broad-spectrum antifungal and antioxidant functions, and can undergo cross-linking reactions with hydroxyl and amino groups in plant fibers to generate stable hydrogen bonds and complex structures, thereby inhibiting the attachment and infection of microorganisms such as Aspergillus, Penicillium, and Fusarium on the surface of grass. At the same time, polyphenols can scavenge free radicals, inhibit the chain reaction of cellulase degradation, and enhance the biochemical stability of grass from the microscopic reaction level. Compared with traditional grass that weathers significantly in arid environments within 1 to 2 years, the grass grid material treated by the present invention can maintain stable structural strength for 3 to 5 years under natural exposure conditions, and its anti-biodegradation performance is significantly improved.

[0171] (3) From the perspective of process feasibility and environmental adaptability, the raw materials used in the present invention are all derived from natural renewable resources and have good ecological safety and regional adaptability. The adopted impregnation / spraying + drying composite treatment process is simple and low-consumption, does not change the traditional grass grid construction process, and the grass material after treatment still maintains its original flexibility, construction feasibility and ecological degradability, and is suitable for large-scale engineering promotion and application. At the same time, the coating components do not contain any organic solvents, heavy metals or environmental residual toxic substances, and can be used safely for a long time in wind and sand source areas, vegetation transition zones, and farmland forest network areas, meeting the sustainable development needs of ecological restoration projects.

[0172] Therefore, the present invention systematically improves the corrosion resistance and weather resistance of the grass grid through the upgrading of material composition and the coordinated design of structural functions, extending its protective life from 2 to 3 years to 5 years or more. Without affecting the construction convenience and ecological safety, it realizes the "long-term, green and low-consumption" transformation of the grass grid, which has important engineering practical value and prospects for promotion of ecological governance.

[0173] The foregoing description is merely a preferred embodiment of the present invention and is 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 are intended to be within the scope of protection of the present invention.

Claims

1. A protective coating treatment agent, characterized in that: The protective coating treatment agent comprises a first component, a second component and a third component in a mass ratio of 10:(0.5-2.5):(1-3); Among them, the first component is a natural polymer film-forming material; the second component is a plant-derived functional antidegradant; and the third component is a natural mineral particle enhancer.

2. The protective coating treatment agent according to claim 1, characterized in that The natural polymer film-forming material includes at least one of chitosan, sodium alginate, gelatin and sodium carboxymethyl cellulose; Preferably, the natural polymer film-forming material includes chitosan, sodium alginate and gelatin.

3. The protective coating treatment agent according to claim 1, characterized in that The plant-derived functional antidegradants include natural polyphenol compounds; Preferably, the plant-derived functional antidegradant comprises at least one of tannic acid, tea polyphenols, naringenin and eugenol; Preferably, the plant-derived functional antidegradants include tannic acid, tea polyphenols and naringenin.

4. The protective coating treatment agent according to claim 1, characterized in that The natural mineral particle reinforcing agent includes at least one of attapulgite, bentonite, diatomaceous earth and biochar powder; Preferably, the natural mineral particle enhancer includes attapulgite and biochar powder; Preferably, the particle size of the biochar powder does not exceed 5 μm.

5. A protective coating treatment liquid, characterized in that: The protective coating treatment liquid comprises a solvent and the protective coating treatment agent according to any one of claims 1 to 4; Preferably, every 100 mL of the protective coating treatment liquid contains 2 g to 6 g of the protective coating treatment agent; Preferably, the protective coating treatment solution further comprises an auxiliary agent; Preferably, the adjuvant comprises a dispersant; Preferably, the mass of the dispersant is 0.05% to 0.15% of the protective coating treatment solution; Preferably, the dispersant comprises locust bean gum or a non-toxic nonionic emulsifier; Preferably, the non-toxic nonionic emulsifier comprises glycerol; Preferably, the pH value of the protective coating treatment solution is 5.5-6.

5.

6. A method for preparing a protective coating treatment solution according to claim 5, characterized in that: The following steps are involved: Mix the preset ingredients; Preferably, the first component is mixed with water, and then the second component is added and mixed, and then the third component is added and mixed, and then the auxiliary agent is added and mixed.

7. Use of the protective coating treatment agent according to any one of claims 1 to 4 or the protective coating treatment liquid according to claim 5 in forage; Preferably, the protective coating treatment agent or protective coating treatment liquid is used to form a protective coating on the surface of grass material.

8. A modified grass material, characterized in that: The modified grass material includes grass material and a protective coating on the surface of the grass material; The protective coating is formed by the protective coating treatment agent according to any one of claims 1 to 4 or the protective coating treatment liquid according to claim 5; Preferably, the thickness of the protective coating is 20 μm to 60 μm; Preferably, when the bending angle of the modified straw material is ≥90°, the protective coating does not break.

9. A method for preparing the modified grass material according to claim 8, characterized in that: The following steps are involved: Applying a coating liquid containing the protective coating agent on the surface of the grass material, followed by drying; Preferably, coating comprises dipping or spraying, and / or drying comprises natural drying or hot air drying; Preferably, the mass ratio of the grass material to the coating liquid is 1.5:1 to 2:1; Preferably, the immersion time is 2 min to 5 min; Preferably, the spraying times are 2 to 3 times; Preferably, the hot air drying temperature is 40° C. to 50° C., and the hot air drying time is 12 hours to 24 hours.

10. A grass grid, characterized in that: The grass grid is woven from the modified grass material according to claim 8; Preferably, the grass grid is used for laying on sandy ground; Preferably, the grass grid is buried at a depth of 15 cm to 20 cm in the sand; Preferably, the grass grid is used for railways, highway slopes, wind and sand protection forests or comprehensive desertification control projects.

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