A kind of loaded tree whitening agent and preparation method thereof

Abstract

The present invention belongs to the technical field of whitewash agents, specifically relating to a loaded wood whitewash agent and its preparation method. The preparation method comprises: adding xanthan gum and an adhesive to water to obtain a thickening liquid; adding humic acid, bentonite, sulfur powder, nano-calcium carbonate, isopentenyl adenosine, and a botanical synergist to the water, ultrasonically dispersing the mixture, allowing it to stand for adsorption, and then dehydrating and drying it to obtain a bentonite-loaded composite; adding quicklime to the water and slaking it to obtain a base material; and adding the thickening liquid, the bentonite-loaded composite material, hydroxypropyl methylcellulose, and sodium polyacrylate to the base material to obtain the loaded wood whitewash agent. The advantages of this solution are as follows: first, using bentonite as a carrier to load multiple active ingredients improves the stability and long-lasting effectiveness of the active ingredients and enhances the adhesion of the wood whitewash liquid; second, the added botanical synergist has a natural animal repellent effect, significantly reducing the risk of tree gnawing and preventing pests and diseases.

Description

Technical Field

[0001] The invention relates to the technical field of whitening agents, in particular to a loaded tree whitening agent and a preparation method thereof. Background Art

[0002] Tree whitewash is a protective coating specially used for application on tree trunks. It is usually white or light-colored and is widely used in urban greening, forestry protection, orchard management and other fields. It is particularly suitable for newly planted trees, ancient trees and trees that are susceptible to frost damage, diseases and pests.

[0003] Traditional wood whitewashes, primarily composed of quicklime, sulfur powder, vegetable oil, and salt, protect against sunburn and frost damage through the reflective properties of the white coating, while also relying on the bactericidal properties of sulfur to inhibit pathogens. However, existing whitewashes have poor adhesion and are easily washed away by rain, requiring frequent reapplications and increasing labor costs. Furthermore, existing whitewashes lack effective protection against wildlife and livestock, which can gnaw on trees, stripping them of their protective layer and leaving them vulnerable to other pathogens and pests, impacting their growth and development. Summary of the Invention

[0004] In order to solve the problems existing in the prior art, the present invention provides a loaded tree whitewash agent, which aims to solve the problems of insufficient adhesion and short protection period of traditional whitewash agents, and enhance the prevention of pests and diseases and animal gnawing. The specific solution is as follows:

[0005] A loaded wood whitening agent comprises the following raw materials in parts by mass: 40-55 parts of water, 18-25 parts of quicklime, 15-20 parts of bentonite, 3-4 parts of humic acid, 2.5-3.5 parts of sulfur powder, 2-4 parts of hydroxypropyl methylcellulose, 2-3 parts of nano-calcium carbonate, 1-3 parts of isopentenyl adenosine, 4-6 parts of a plant-derived synergist, 2-3 parts of sodium polyacrylate, 1-1.5 parts of an adhesive, and 0.5-1 part of xanthan gum.

[0006] Preferably, the plant-derived synergist is prepared by compounding matrine, peppermint oil and capsaicin in a mass ratio of 3:1.5:1.

[0007] Preferably, the supported wood whitening agent further comprises 3 to 5 parts of reflective material.

[0008] Preferably, the reflective material is made of mica powder and titanium dioxide in a mass ratio of 1:2.

[0009] Preferably, the adhesive is prepared by mixing sodium carboxymethyl cellulose and polyvinyl alcohol in a mass ratio of 2:1.

[0010] On the other hand, the present invention also provides a method for preparing a supported wood whitening agent, comprising the following steps:

[0011] 1) Take 5-10 parts of water, add 0.5-1 part of xanthan gum and 1-1.5 parts of adhesive, and stir until completely dissolved to obtain a thickened solution.

[0012] 2) adding 3-4 parts of humic acid and 15-20 parts of pretreated bentonite to water at a solid-to-liquid ratio of 1:3, stirring and mixing, adding 2.5-3.5 parts of sulfur powder, 2-3 parts of nano-calcium carbonate, 1-3 parts of isopentenyl adenosine, and 4-6 parts of a plant-derived synergist, ultrasonically dispersing the mixture, allowing the mixture to stand for adsorption, centrifuging, and drying the mixture until the moisture content is ≤5% to obtain a bentonite-loaded composite material;

[0013] 3) Add 18 to 25 parts of quicklime in batches to the remaining 35 to 45 parts of water, stir and mature, and cool to room temperature to obtain a base material;

[0014] 4) adding the prepared thickening liquid, bentonite-loaded composite material, 2 to 4 parts of hydroxypropyl methylcellulose, and 2 to 3 parts of sodium polyacrylate to the base material, performing ultrasonic dispersion, grinding the mixture 2 to 3 times with a colloid mill, and then packaging the mixture into moisture-proof sealed barrels to obtain a loaded wood whitening agent.

[0015] Preferably, the bentonite pretreatment step comprises:

[0016] 1) Add bentonite and hydrochloric acid solution to a reaction vessel at a liquid-to-solid ratio of 3:1, stir, heat the reaction vessel to 55-60°C, and react for 2 hours;

[0017] 2) After the reaction is completed, the bentonite solid is separated by centrifugation, and the separated bentonite is rinsed with water until the pH value of the rinse liquid is neutral;

[0018] 3) Place the rinsed bentonite in a drying oven and dry it to constant weight to complete the pretreatment.

[0019] Preferably, the mass fraction of the hydrochloric acid solution is 15%.

[0020] After adopting the above technical solution, the beneficial effects of the present invention are:

[0021] 1. Using bentonite as a carrier, by loading multiple active ingredients, the effective loading and sustained release of active ingredients are achieved, and the stability and long-lasting effect of the active ingredients are improved;

[0022] 2. The present invention enhances the anti-gnawing function of the whitewash by adding a plant-derived synergist, which has a natural repellent effect on animals and can significantly reduce the risk of trees being gnawed. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments. It should be understood that the specific embodiments described herein are only configured to explain the present invention and are not configured to limit the present invention. For those skilled in the art, the present invention can be implemented without the need for some of these specific details. The following description of the embodiments is merely to provide a better understanding of the present invention by illustrating examples of the present invention.

[0024] The present invention provides a supported wood whitening agent, comprising the following raw materials in parts by mass: 40-55 parts of water, 18-25 parts of quicklime, 15-20 parts of bentonite, 3-4 parts of humic acid, 2.5-3.5 parts of sulfur powder, 2-4 parts of hydroxypropyl methylcellulose, 2-3 parts of nano-calcium carbonate, 1-3 parts of isopentenyl adenosine, 4-6 parts of a plant-derived synergist, 2-3 parts of sodium polyacrylate, 1-1.5 parts of an adhesive, and 0.5-1 part of xanthan gum. The following are specific preparation steps and technical details of the supported wood whitening agent.

[0025] Example 1

[0026] Step 1: Prepare the ingredients

[0027] 1) Preparation of thickening liquid

[0028] Weigh sodium carboxymethyl cellulose and polyvinyl alcohol in a mass ratio of 2:1 to form an adhesive. Add 0.5 parts xanthan gum and 1 part adhesive to 5 parts water and stir until completely dissolved and no particles are visible to the naked eye to obtain a thickened solution.

[0029] Xanthan gum's high viscosity significantly increases the whitewash's consistency, ensuring uniform suspension of whitewash particles and preventing sedimentation, ensuring the coating adheres evenly to the tree trunk surface. Sodium carboxymethyl cellulose improves the coating's adhesion, reducing shedding caused by rain. Polyvinyl alcohol provides bonding and film-forming properties, enhancing the coating's cohesion and resistance to peeling. The film formed by polyvinyl alcohol is highly weather-resistant, resisting UV rays, rain damage, and temperature fluctuations, extending the effective life of the whitewash.

[0030] By compounding xanthan gum, sodium carboxymethyl cellulose and polyvinyl alcohol, the viscosity, adhesion and durability of the whitewashing agent are significantly improved.

[0031] 2) Preparation of bentonite-loaded composites

[0032] Weigh 3 parts of reflective material, 2.5 parts of sulfur powder, 2 parts of nano-calcium carbonate and 1 part of isopentenyl adenosine, put the above raw materials into a three-dimensional mixer, set the speed to 80 rpm, and mix for 10 minutes to obtain a composite powder.

[0033] Reflective material, made from a mixture of mica powder and titanium dioxide in a mass ratio of 1:2, significantly enhances the coating's reflective properties, preventing sunburn, reducing the temperature difference between day and night, and preventing tree trunks from freezing and cracking due to rapid temperature fluctuations. When used on trees, whitewash increases visibility at night or in low-light conditions, improving driving safety.

[0034] Add 12% to 15% hydrochloric acid solution (mass fraction) to the reaction vessel, add 15 parts bentonite (powder) at a liquid-to-solid ratio of 3:1 (mL / g), start stirring, heat the reaction vessel to 55-60°C, and maintain the reaction at this temperature for 2 hours. After the reaction is complete, separate the bentonite solids by centrifugation and rinse with water until the pH of the rinse liquid is neutral. Transfer the rinsed bentonite to a drying oven and dry at 105°C to constant weight to complete the pretreatment.

[0035] Matrine, peppermint oil, and capsaicin were weighed in a mass ratio of 3:1.5:1 to form a botanical synergist. Three parts of humic acid and pretreated bentonite were added to water at a solid-to-liquid ratio of 1:3 (g / mL). The mixture was stirred, and the composite powder and four parts of the botanical synergist were added. Ultrasonic dispersion was performed for 15-20 minutes, followed by adsorption for 24 hours. The solids were then separated by centrifugation. The separated solids were then dried to a moisture content of ≤5% to obtain the bentonite-loaded composite.

[0036] Acid-activated bentonite can expand its interlayer spacing and significantly increase its specific surface area. Acid treatment exposes more hydroxyl groups on its surface, enhancing the adsorption performance and loading capacity of bentonite, allowing it to load more active ingredients (such as nano-calcium carbonate, matrine, sulfur powder, capsaicin, etc.), thereby improving the durability and stability of the drug's efficacy.

[0037] Humic acid can improve the air permeability of the coating and prevent the bark from stuffiness and rotting. After being compounded with bentonite, it forms a porous slow-release carrier through ion exchange and adsorption, thereby improving the loading capacity.

[0038] Sulfur powder has a broad-spectrum insecticidal and fungicidal effect and is effective against a variety of diseases and pests, which makes the loaded tree whitewash agent have a wider range of applications.

[0039] Nano-calcium carbonate provides nanoscale calcium ions that penetrate microcracks in the bark, strengthening the bark cell walls and preventing cracked bark disease. Nano-calcium carbonate also has a large specific surface area and excellent adsorption properties. It can serve as a carrier material, synergizing with bentonite to achieve sustained and controlled release of active ingredients (such as matrine and sulfur powder), thereby extending the effectiveness of whitening agents.

[0040] Matrine has contact and stomach poisoning effects on many pests, and is particularly effective against aphids, red spiders, longhorn beetles and other pests. Its strong bitter taste is repellent to animals, and the compound capsaicin and peppermint oil effectively prevent animals from gnawing on the bark through odor stimulation.

[0041] The amino acids, polysaccharides, fatty acids and flavonoids contained in matrine work synergistically with isopentenyl adenosine to enhance the wound's self-healing ability.

[0042] 3) Base material preparation

[0043] 18 parts of quicklime were added to 35 parts of water in three stages with an interval of 20 minutes each time, and the mixture was slaked for 2.5 hours under mechanical stirring at 80 rpm and aged for 24 hours to obtain a base material.

[0044] Step 2: Loading and final product forming

[0045] Add thickening liquid, bentonite loaded compound, 2 parts of hydroxypropyl methylcellulose and 2 parts of sodium polyacrylate to the base material in sequence, ultrasonically disperse for 20 minutes, grind 2 to 3 times through a colloid mill, and then pack into moisture-proof sealed barrels to obtain a loaded wood whitening agent.

[0046] Hydroxypropyl methylcellulose ensures uniform distribution of particles in the whitening agent, preventing sedimentation and improving the whitening effect. Sodium polyacrylate adsorbs on the surface of particles, keeping them dispersed.

[0047] Example 2

[0048] A method for preparing a supported wood whitening agent comprises the following steps:

[0049] 1) Take 8 parts of water, add 0.6 parts of xanthan gum and 1.2 parts of adhesive, and stir until completely dissolved to obtain a thickened solution;

[0050] 2) adding 3.5 parts of humic acid and 17.5 parts of pretreated bentonite to water at a solid-to-liquid ratio of 1:3, stirring and mixing, then adding 3 parts of sulfur powder, 2.5 parts of nano-calcium carbonate, 3.5 parts of reflective material, 2 parts of isopentenyl adenosine, and 5 parts of a plant-derived synergist, ultrasonically dispersing the mixture, allowing it to stand for adsorption, centrifuging, and drying it to a moisture content of ≤5% to obtain a bentonite-loaded composite;

[0051] 3) Add 20 parts of quicklime to 40 parts of water in batches, stir and mature to obtain a base material;

[0052] 4) adding the prepared thickening liquid, bentonite-loaded composite, 3 parts of hydroxypropyl methylcellulose, and 2.5 parts of sodium polyacrylate to the base material, performing ultrasonic dispersion, grinding the mixture 2 to 3 times with a colloid mill, and then packaging the mixture into moisture-proof sealed barrels to obtain a loaded wood whitening agent.

[0053] Example 3

[0054] A method for preparing a supported wood whitening agent comprises the following steps:

[0055] 1) Add 1 part xanthan gum and 1.5 parts adhesive to 10 parts water and stir until completely dissolved to obtain a thickened solution.

[0056] 2) adding 4 parts of humic acid and 20 parts of pretreated bentonite to water at a solid-to-liquid ratio of 1:3, stirring and mixing, then adding 3.5 parts of sulfur powder, 3 parts of nano-calcium carbonate, 5 parts of reflective material, 3 parts of isopentenyl adenosine, and 6 parts of a plant-derived synergist, ultrasonically dispersing the mixture, allowing it to stand for adsorption, centrifuging, and drying it to a moisture content of ≤5% to obtain a bentonite-loaded composite;

[0057] 3) Add 25 parts of quicklime to 45 parts of water in batches, stir and mature to obtain a base material;

[0058] 4) adding the prepared thickening liquid, bentonite-loaded composite material, 4 parts of hydroxypropyl methylcellulose, and 3 parts of sodium polyacrylate to the base material, performing ultrasonic dispersion, grinding the mixture 2 to 3 times with a colloid mill, and then packaging the mixture into moisture-proof sealed barrels to obtain a loaded wood whitening agent.

[0059] Performance tests were conducted on samples from the three examples and commercially available whitewashes (Guoguang Motai and Linsheng). Through systematic testing, the physical properties, functionality, ingredient safety, and environmental adaptability of the loaded tree whitewashes were evaluated, providing a scientific basis for product optimization and quality control.

[0060] The whitewash was applied to three experimental forest plots, with 50 trees in each plot treated with each whitewash. The whitewash application window was October 15th, which ensured a balance between rapid curing and long-lasting protection. Obstructions such as moss, lichen, and bark were removed to reduce overwintering sites for pests and diseases. The whitewash was applied from the base of the trunk upwards in a circular pattern, applying a moderate thickness each time. A further layer was applied after the previous layer had slightly dried, extending the application height from the ground to 1 to 1.5 meters. The coating conditions were recorded and averaged on March 15th of the following year. The experimental results are shown in Table 1.

[0061] Xanthan gum, sodium carboxymethyl cellulose, and polyvinyl alcohol work synergistically to form a high-strength adhesive system, ensuring the coating adheres securely to the tree trunk surface. Bentonite, acting as a carrier, further enhances the coating's cohesion and reduces the risk of detachment. This optimized adhesive system and bentonite loading structure enhance the coating's stability in low-temperature environments, reducing frost cracking. Traditional whitewashes (such as Guoguang Motai and Linsheng) rely on lime-based and vegetable oil-based adhesive systems, making the coating prone to cracking and detachment.

[0062] Supported wood whitening agents utilize bentonite-loaded technology to achieve sustained release of active ingredients, significantly extending their effectiveness and increasing their barrier efficiency. Most commercially available products utilize a single sulfur or organic copper biocide, lacking a sustained-release carrier, resulting in a short effective life and limited barrier efficiency.

[0063] The bitter taste of matrine can trigger an instinctive disgust reaction in animals and has an avoidance effect on animals. Capsaicin activates the TRPV1 receptor of mammals and causes a burning sensation. The smell of peppermint oil interferes with the animal's olfactory positioning, forming a natural protective barrier and reducing vulnerability to gnawing.

[0064] A combination of titanium dioxide and mica powder can enhance reflectivity, reduce the temperature difference between day and night, and significantly reduce microcracks in the bark caused by thermal expansion and contraction. Nanoscale calcium ions can penetrate the bark cell walls, enhancing toughness.

[0065] Table 1 Comprehensive comparison of experimental data

[0066]

[0067] The coating integrity test is designed to evaluate the durability of the whitewash's adhesion to the tree trunk surface. Each test tree is observed 360 degrees around the tree to record areas of coating loss, cracking, and peeling.

[0068]

[0069] The purpose of testing pest and disease barrier efficiency is to evaluate the effectiveness of whitewash against overwintering pests and diseases. Before application, count the number of pests and diseases (such as scale insects, longhorn beetle larvae, and spider mites) remaining in the bark of the treated area. On March 15th of the following year, scrape the coating off the tree trunk surface and count the number of living pests and diseases.

[0070]

[0071] The grazing rate test evaluates the effectiveness of whitewash against gnawing animals (such as rabbits, mice, deer, cattle, and sheep). The number and area of ​​grazing marks within the treated area of ​​each test tree are counted. Infrared cameras are installed to monitor animal activity in the test forest area, and causal relationships are analyzed based on grazing marks.

[0072]

[0073] The frost crack rate test is to evaluate the effectiveness of whitewash in preventing frost cracking of tree trunks. Each test tree is inspected 360° around the tree and the number of frost cracks is recorded.

[0074]

[0075] While the embodiments of the present invention are described above, these embodiments do not exhaustively describe all details, nor do they limit the present invention to specific embodiments. Clearly, many modifications and variations can be made based on the above description. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to make good use of the present invention and its modifications and uses. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A supported wood whitening agent, characterized in that: The invention comprises the following raw materials in parts by mass: 40-55 parts of water, 18-25 parts of quicklime, 15-20 parts of bentonite, 3-4 parts of humic acid, 2.5-3.5 parts of sulfur powder, 2-4 parts of hydroxypropyl methylcellulose, 2-3 parts of nano-calcium carbonate, 1-3 parts of isopentenyl adenosine, 4-6 parts of a plant-derived synergist, 2-3 parts of sodium polyacrylate, 1-1.5 parts of an adhesive, and 0.5-1 part of xanthan gum; the plant-derived synergist is prepared by mixing matrine, peppermint oil, and capsaicin in a mass ratio of 3:1.5:1; and the adhesive is prepared by mixing sodium carboxymethyl cellulose and polyvinyl alcohol in a mass ratio of 2:

1.

2. The supported wood whitening agent according to claim 1, characterized in that: The loaded wood whitening agent further comprises 3 to 5 parts of a reflective material.

3. The supported wood whitening agent according to claim 2, characterized in that: The reflective material is prepared by compounding mica powder and titanium dioxide in a mass ratio of 1:

2.

4. A method for preparing the supported wood whitening agent according to claim 1, characterized in that: The steps include: 1) Take 5-10 parts of water, add 0.5-1 part of xanthan gum and 1-1.5 parts of adhesive, and stir until completely dissolved to obtain a thickened solution. 2) adding 3-4 parts of humic acid and 15-20 parts of pretreated bentonite to water at a solid-to-liquid ratio of 1:3, stirring and mixing, adding 2.5-3.5 parts of sulfur powder, 2-3 parts of nano-calcium carbonate, 1-3 parts of isopentenyl adenosine, and 4-6 parts of a plant-derived synergist, ultrasonically dispersing the mixture, allowing the mixture to stand for adsorption, centrifuging, and drying the mixture until the moisture content is ≤5% to obtain a bentonite-loaded composite material; 3) Add 18 to 25 parts of quicklime in batches to the remaining 35 to 45 parts of water, stir and mature, and cool to room temperature to obtain a base material; 4) adding the prepared thickening liquid, bentonite-loaded composite material, 2 to 4 parts of hydroxypropyl methylcellulose, and 2 to 3 parts of sodium polyacrylate to the base material, performing ultrasonic dispersion, grinding the mixture 2 to 3 times with a colloid mill, and then packaging the mixture into moisture-proof sealed barrels to obtain a loaded wood whitening agent.

5. The method for preparing the supported wood whitening agent according to claim 4, characterized in that: The pretreatment step of the bentonite comprises: 1) Add bentonite and hydrochloric acid solution to a reaction vessel at a liquid-to-solid ratio of 3:1, stir, heat the reaction vessel to 55-60°C, and react for 2 hours; 2) After the reaction is completed, the bentonite solid is separated by centrifugation, and the separated bentonite is rinsed with water until the pH value of the rinse liquid is neutral; 3) Place the rinsed bentonite in a drying oven and dry it to constant weight to complete the pretreatment.

6. The method for preparing the supported wood whitening agent according to claim 5, characterized in that: The mass fraction of the hydrochloric acid solution is 15%.

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