Matched cross beam treatment method for prolonging service life of breeding greenhouse

Abstract

The invention relates to the technical field of greenhouse materials, and discloses a matched cross beam treatment method for prolonging the service life of a breeding greenhouse, which comprises the following steps: (1) pretreating glass fiber powder; (2) nano interface modification; (3) preparing a rubber and plastic composite material; (4) magnetic field induced orientation treatment; the glass fiber powder is pretreated, so that a strong cavitation effect can be generated on the surface of the glass fiber powder, and meanwhile, the synchronously sprayed lecithin and cocamidopropyl betaine compounded surfactant solution can better permeate into micro-pores of the glass fiber powder by virtue of the cavitation effect and is uniformly adsorbed on the surface of the glass fiber powder, so that the surface of the glass fiber powder is more uniform. And an interface layer with special activity is formed. Through a series of unique treatment steps, the prepared breeding greenhouse cross beam is remarkably improved in the aspects of corrosion resistance and mechanical properties, the service life of a breeding greenhouse is effectively prolonged, the use cost of farmers is reduced, and the breeding greenhouse cross beam has wide application prospects.

Description

Technical Field

[0001] The present invention relates to the technical field of greenhouse materials, and specifically to a supporting beam treatment method for improving the service life of aquaculture greenhouses. Background Art

[0002] As an important facility for modern agricultural aquaculture, aquaculture greenhouses provide a suitable growth environment for various livestock and poultry. Through reasonable spatial layout and environmental control means, it can effectively resist adverse external climate conditions, such as severe cold, heat, wind, and rain, ensuring that aquaculture animals grow healthily in a relatively stable environment of temperature, humidity, light, etc., greatly improving aquaculture efficiency and economic benefits.

[0003] In the overall structure of aquaculture greenhouses, crossbeams play a crucial supporting role. The crossbeams, columns, etc. of the greenhouse need to bear the weight of the roof covering materials, maintain the overall shape and stability of the greenhouse, and ensure that the greenhouse can still maintain its structural integrity under the action of external forces such as strong winds and snow in different climate conditions.

[0004] However, in the actual use process of aquaculture greenhouses, the manure in the aquaculture greenhouse has caused serious corrosion to the greenhouse crossbeams. Because livestock and poultry produce a large amount of manure during the aquaculture process, and these manures contain various complex chemical components, such as uric acid, ammonia, and various microbial metabolites. In the relatively closed and humid environment of the greenhouse, acidic substances such as uric acid in the manure will react chemically with the components on the surface of the crossbeam, gradually corroding the crossbeam, resulting in a gradual reduction in the mechanical properties of the crossbeam, which will directly lead to the damage of the greenhouse. Moreover, ammonia is prone to form an alkaline environment in a humid environment, which also has an erosive effect on the crossbeam material. In addition, the microorganisms bred in the manure also participate in the process of damaging the crossbeam. They grow and reproduce on the surface of the crossbeam, and some enzymes or acidic substances secreted further accelerate the corrosion of the crossbeam.

[0005] Over time, various complex corrosion phenomena have been intensifying, seriously affecting the mechanical properties of the greenhouse crossbeams. The originally strong crossbeams have problems such as decreased strength and brittle structure due to corrosion, and their supporting ability has been greatly reduced. When encountering bad weather, such as strong winds and heavy rains, these corroded crossbeams are difficult to bear the additional load, and are prone to deformation or even fracture, resulting in damage to the structure of the entire aquaculture greenhouse and inability to be used normally.

[0006] This requires replacing the new crossbeams. However, frequently replacing the damaged crossbeams not only consumes a large amount of manpower, material resources, and financial resources, but also affects the continuity of aquaculture operations, causing instability in the growth environment of aquaculture animals, bringing huge economic losses to farmers.

[0007] Therefore, developing a method that can effectively improve the corrosion resistance of the crossbeams in the aquaculture greenhouse and thus extend the lifespan of the aquaculture greenhouse has become an urgent problem to be solved in the current aquaculture industry. Summary of the Invention

[0008] In view of the problems in the prior art, the present invention provides a method for treating the supporting crossbeams to improve the lifespan of the aquaculture greenhouse.

[0009] The technical solution adopted by the present invention to solve its technical problems is: a method for treating the supporting crossbeams to improve the lifespan of the aquaculture greenhouse, including the following steps: (1) Pretreatment of glass fiber powder: Place the glass fiber powder in a vacuum environment, treat it with ultrasonic waves at a power density of 25 - 30 kW / m³ for 8 - 10 minutes, and simultaneously spray a surfactant solution with a concentration of 1.2 - 1.6 wt% during the ultrasonic treatment. After the treatment is completed, take out the pretreated glass fiber powder; The average particle size of the glass fiber powder is 3 μm; (2) Nano - interface modification: Disperse the pretreated glass fiber powder obtained in step (1) in an ethanol solution with a mass fraction of 70%, then add 3 - 5% of nano - titanium dioxide sol and 1.2 - 1.6% of graphene quantum dots based on the mass of the pretreated glass fiber powder, and then magnetically stir at 60 - 65 °C for 30 - 40 minutes. Subsequently, perform centrifugal separation and dry at 60 °C for 10 h to obtain the glass fiber powder modified twice; (3) Preparation of rubber - plastic composite material: Mix the glass fiber powder modified twice with the rubber - plastic matrix at a mass ratio of 8 - 15:100, melt - blend them through a twin - screw extruder at 200 - 220 °C, and after extrusion and pelletization, injection - mold them into the preliminary crossbeams of the aquaculture greenhouse; (4) Magnetic - field - induced orientation treatment: Place the preliminary crossbeams of the aquaculture greenhouse in a magnetic field of 0.8 - 1.0 T, keep them at 120 - 132 °C for 12 - 15 minutes, then take them out and naturally cool to room temperature. In this way, the modified glass fiber powder forms a gradient - orientation structure along the magnetic - field direction.

[0010] As a further technical solution: The vacuum degree of the vacuum environment in step (1) is 0.2 - 0.3 Pa, and the ultrasonic frequency is 35 - 40 kHz.

[0011] As a further technical solution: The surfactant is a compound of lecithin and cocamidopropyl betaine, and the compounding mass ratio is 3:1.

[0012] As a further technical solution: The concentration of the nano - titanium dioxide sol in step (2) is 10 - 12 wt%, and the average particle size is 20 - 30 nm.

[0013] As a further technical solution: the lateral size of the graphene quantum dots in the step (2) is 5-15 nm, the thickness is ≤ 5 layers, and the surface is provided with hydroxyl and carboxyl functional groups.

[0014] As a further technical solution: the rubber and plastic matrix is a blend of ethylene propylene diene monomer rubber and high-density polyethylene, and the blending mass ratio of ethylene propylene diene monomer rubber to high-density polyethylene is 40-45:50-60.

[0015] As a further technical solution: the length-diameter ratio of the twin-screw extruder is 38:1, and the screw rotation speed is 180-200 rpm.

[0016] As a further technical solution: in the magnetic field-induced orientation treatment in the step (4), the alternating magnetic field frequency is 50-100 Hz, and the gradient magnetic field intensity change rate is 0.1-0.3 T / m.

[0017] As a further technical solution: the cross-sectional shape of the cross beam of the breeding greenhouse is I-shaped or C-shaped, and the wall thickness is 3-5 mm.

[0018] The beneficial effects of the present invention: By pretreating the glass fiber powder, the present invention can generate a strong cavitation effect on the surface of the glass fiber powder, making its surface microstructure rough and porous. At the same time, the compound surfactant solution of lecithin and cocamidopropyl betaine sprayed synchronously can better penetrate into the microscopic pores of the glass fiber powder by means of cavitation, uniformly adsorb on its surface, and form an interfacial layer with special activity. This interfacial layer not only enhances the affinity between the glass fiber powder and the subsequent added substances, but also lays a good foundation for nano-interface modification.

[0019] In terms of mechanical properties, the enhanced affinity is beneficial to better compounding with other materials subsequently, and improving the overall strength of the prepared cross beam. During the nano-interface modification process, nano-titanium dioxide sol and graphene quantum dots are added to perform secondary treatment on the pretreated glass fiber powder. Nano-titanium dioxide sol, due to its high activity and small particle size, can fill the microscopic pores and defects on the surface of glass fiber powder, further optimize the surface structure of glass fiber powder, and enhance its own weather resistance and chemical stability. At the same time, graphene quantum dots, with their unique two-dimensional structure, good conductivity, and abundant hydroxyl and carboxyl functional groups on the surface, have strong physical and chemical adsorption with nano-titanium dioxide sol and glass fiber powder surface. This adsorption not only forms a stable composite structure among the three, but also constructs an efficient electron transmission channel in the composite system. From the perspective of performance improvement, on the one hand, the composite structure enhances the absorption and dissipation ability of glass fiber powder to external energy such as ultraviolet rays, further improves its weather resistance, and thus indirectly improves the corrosion resistance of the beam; on the other hand, the stable composite structure and the existence of the electron transmission channel significantly improve the dispersibility and interfacial bonding of glass fiber powder in the rubber-plastic matrix. When this secondary treated glass fiber powder is introduced into the rubber-plastic composite material of the beam, it can effectively prevent the generation and expansion of micro cracks inside the material, thereby greatly improving the mechanical properties of the beam, such as tensile strength and bending strength. During the magnetic field induced orientation treatment process, the initially formed breeding greenhouse beam is placed in an alternating magnetic field. Under this condition, the polar groups in the modified glass fiber powder will be affected by the magnetic field force, prompting it to be arranged in an orderly manner along the magnetic field direction, thereby forming a gradient orientation structure. From the perspective of the mechanical performance improvement mechanism, this gradient orientation structure enables the glass fiber powder to form a reinforced network inside the beam, which can more effectively bear the external load and enhance the overall bearing capacity of the beam. When the beam is subjected to external force, the gradient oriented glass fiber powder can evenly distribute the load to the entire material system, avoiding the occurrence of stress concentration, thereby significantly improving the mechanical indicators of the beam such as compressive strength and bending resistance. In terms of corrosion resistance, the gradient orientation structure optimizes the microscopic pore structure inside the beam and reduces the penetration channel of corrosive substances inside the material. At the same time, the orderly arranged glass fiber powder enhances the physical shielding effect on the rubber-plastic matrix, further blocking the contact between external corrosive substances and the rubber-plastic matrix, thereby improving the corrosion resistance of the beam.

[0020] Through a series of unique processing steps of the present invention, the corrosion resistance and mechanical properties of the prepared breeding greenhouse beams are significantly improved, which effectively extends the service life of the breeding greenhouse, reduces the use cost of breeders, and has broad application prospects. DETAILED DESCRIPTION

[0021] To enable those skilled in the art to better understand the solution of this application, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in this application without creative efforts shall fall within the scope of protection of this application.

[0022] This application provides a supporting beam treatment method for enhancing the lifespan of a breeding greenhouse. Through a series of unique steps, this method significantly enhances the performance of the beam, thereby extending the service life of the breeding greenhouse. The specific steps are as follows: Fiberglass powder pretreatment: Place glass fiber powder with an average particle size of 3μm in a vacuum environment with a vacuum degree of 0.2 - 0.3 Pa, and perform ultrasonic treatment for 8 - 10 minutes with a power density of 25 - 30 kW / m³ and a frequency of 35 - 40 kHz. During the ultrasonic treatment, a surfactant solution with a concentration of 1.2 - 1.6 wt% is simultaneously sprayed. Here, the surfactant is a compound of lecithin and cocamidopropyl betaine in a mass ratio of 3:1. After the treatment is completed, take out the pretreated fiberglass powder. Nanoscale interface modification: Disperse the pretreated fiberglass powder in an ethanol solution with a mass fraction of 70%, then add nano-titanium dioxide sol with a mass of 3 - 5% of the pretreated fiberglass powder, a concentration of 10 - 12 wt%, and an average particle size of 20 - 30 nm, and graphene quantum dots with a size of 1.2 - 1.6 wt%, a lateral size of 5 - 15 nm, a thickness of ≤5 layers, and surface hydroxyl and carboxyl functional groups. Subsequently, stir magnetically at 60 - 65°C for 30 - 40 minutes, then perform centrifugal separation, and dry at 60°C for 10 h to obtain fiberglass powder modified twice. Preparation of rubber-plastic composite material: Mix the fiberglass powder modified twice with a rubber-plastic matrix in a mass ratio of 8 - 15:100. Among them, the rubber-plastic matrix is a blend of ethylene propylene diene monomer rubber and high-density polyethylene in a mass ratio of 40 - 45:50 - 60. Through a twin-screw extruder with a length-diameter ratio of 38:1 and a screw rotation speed of 180 - 200 rpm, melt-blend at 200 - 220°C, and after extrusion granulation, injection mold it into a preliminary breeding greenhouse beam. Magnetic field-induced orientation treatment: Place the preliminary breeding greenhouse beam in an alternating magnetic field of 0.8 - 1.0 T, with a magnetic field frequency of 50 - 100 Hz and a gradient magnetic field intensity change rate of 0.1 - 0.3 T / m, keep it at 120 - 132°C for 12 - 15 minutes, then take it out and cool naturally to room temperature. This step can make the modified fiberglass powder form a gradient orientation structure along the magnetic field direction. The final obtained breeding greenhouse beam has an I-shaped or C-shaped cross-section and a wall thickness of 3 - 5 mm. The raw materials or reagents used in the following examples are all commercially available.

[0023] Example 1

[0024] This example is prepared by the following method: Pretreatment of glass fiber powder: Take glass fiber powder with an average particle size of 3 μm, and under an environment with a vacuum degree of 0.2 Pa, treat it with ultrasonic waves at a power density of 25 kW / m³ and a frequency of 35 kHz for 8 minutes. At the same time, spray and treat it with a surfactant solution with a concentration of 1.2 wt% and a mass ratio of 3:1 of lecithin and cocamidopropyl betaine. After treatment, take out the pretreated glass fiber powder. Nanoscale interface modification: Disperse the above pretreated glass fiber powder in a 70% ethanol solution, add nano-titanium dioxide sol with a mass of 3% of the pretreated glass fiber powder, a concentration of 10 wt% and an average particle size of 20 nm, and graphene quantum dots with a content of 1.2%, a lateral size of 5 nm, a thickness of ≤5 layers and hydroxyl and carboxyl functional groups. Stir magnetically at 60 °C for 30 minutes, centrifuge and separate, and then dry at 60 °C for 10 h to obtain twice-modified glass fiber powder. Preparation of rubber-plastic composite material: Mix the twice-modified glass fiber powder and the rubber-plastic matrix at a mass ratio of 8:100, and melt and blend them through a twin-screw extruder with a length-diameter ratio of 38:1 and a screw rotation speed of 180 rpm at 200 °C. After extrusion and pelletization, injection mold to form a preliminary crossbeam of a breeding greenhouse; the mass ratio of ethylene-propylene-diene monomer rubber to high-density polyethylene is 40:60. Magnetic field-induced orientation treatment: Place the preliminary crossbeam in an alternating magnetic field with a magnetic field strength of 0.8 T, a frequency of 50 Hz, and a gradient magnetic field strength change rate of 0.1 T / m, keep it at 120 °C for 12 minutes, take it out and cool it naturally to room temperature to obtain the final crossbeam of the breeding greenhouse. The cross-section of the crossbeam is I-shaped, and the wall thickness is 3 mm.

[0025] Example 2 This example is prepared by the following method: Pretreatment of glass fiber powder: Under a vacuum degree of 0.25 Pa, treat glass fiber powder with ultrasonic waves at a power density of 27 kW / m³ and a frequency of 37 kHz for 9 minutes. At the same time, introduce a surfactant solution with a concentration of 1.4 wt%, and the compounding ratio is the same as that in Example 1 to obtain pretreated glass fiber powder. Nanoscale interface modification: Add nano-titanium dioxide sol with a mass of 4% of the pretreated glass fiber powder, a concentration of 11 wt% and an average particle size of 25 nm, and graphene quantum dots with a content of 1.4% and a lateral size of 10 nm. Stir magnetically at 62 °C for 35 minutes, and the subsequent treatment is the same as that in Example 1. Preparation of rubber-plastic composite material: Mix the glass fiber powder and the rubber-plastic matrix at a mass ratio of 12:100, melt and blend them through a twin-screw extruder at 210 °C, with a screw rotation speed of 190 rpm, and the remaining operations are the same as those in Example 1; the mass ratio of ethylene-propylene-diene monomer rubber to high-density polyethylene is 42:55. Magnetic field-induced orientation treatment: Place the preliminary crossbeam in an alternating magnetic field with a magnetic field strength of 0.9 T, a frequency of 75 Hz, and a gradient magnetic field strength change rate of 0.2 T / m, and maintain it at 126 °C for 13 minutes. The final crossbeam has a C-shaped cross-section with a wall thickness of 3 mm.

[0026] Example 3

[0027] This example is made by the following method: Pretreatment of glass fiber powder: Treat glass fiber powder with ultrasonic waves at a vacuum degree of 0.3 Pa, a power density of 30 kW / m³, and a frequency of 40 kHz for 10 minutes, and spray-treat it with a 1.6 wt% surfactant solution identical to that in Example 1. Nanoscale interface modification: Add nano-titanium dioxide sol with a mass fraction of 5% of the pretreated glass fiber powder, a concentration of 12 wt%, and an average particle size of 30 nm, and graphene quantum dots with a mass fraction of 1.6% and a lateral size of 15 nm, and stir magnetically at 65 °C for 40 minutes. Preparation of rubber-plastic composite material: Mix glass fiber powder and rubber-plastic matrix in a mass ratio of 15:100, melt and blend them at 220 °C with a twin-screw extruder, and the screw rotation speed is 200 rpm; the mass ratio of ethylene propylene diene monomer rubber to high-density polyethylene is 45:50. Magnetic field-induced orientation treatment: Place the preliminary crossbeam in an alternating magnetic field with a magnetic field strength of 1.0 T, a frequency of 100 Hz, and a gradient magnetic field strength change rate of 0.3 T / m, and maintain it at 132 °C for 15 minutes. The final crossbeam is I-shaped with a wall thickness of 3 mm.

[0028] Example 4

[0029] This example is made by the following method: Pretreatment of glass fiber powder: In an environment with a vacuum degree of 0.22 Pa, use ultrasonic waves with a power density of 26 kW / m³ and a frequency of 36 kHz to treat glass fiber powder with an average particle size of 3 μm for 8.5 minutes, and at the same time spray-treat it with a 1.3 wt% surfactant solution identical to that in Example 1. After the treatment, take out the pretreated glass fiber powder. Nanoscale interface modification: Disperse the pretreated glass fiber powder in a 70% ethanol solution, add nano-titanium dioxide sol with a mass fraction of 3.5% of the pretreated glass fiber powder, a concentration of 10.5 wt%, and an average particle size of 22 nm, and graphene quantum dots with a mass fraction of 1.3%, a lateral size of 8 nm, a thickness of ≤ 5 layers, and surface hydroxyl and carboxyl functional groups, stir magnetically at 61 °C for 32 minutes, then carry out centrifugal separation, and dry at 60 °C for 10 h to obtain twice-modified glass fiber powder. Preparation of rubber-plastic composite material: The glass fiber powder modified twice is mixed with the rubber-plastic matrix at a mass ratio of 10:100, and melt-blended at 205°C by a twin-screw extruder with a length-diameter ratio of 38:1 and a screw rotation speed of 185 rpm. After extrusion granulation, injection molding is carried out to form the preliminary crossbeam of the breeding greenhouse; the mass ratio of ethylene propylene diene monomer rubber to high-density polyethylene is 41:58. Magnetic field-induced orientation treatment: Place the preliminary crossbeam in an alternating magnetic field with a magnetic field strength of 0.85 T, a frequency of 60 Hz, and a gradient magnetic field strength change rate of 0.15 T / m, keep it at 122°C for 13 minutes, take it out and cool it naturally to room temperature. The final crossbeam section is C-shaped with a wall thickness of 3 mm.

[0030] Example 5 This example is made by the following method: Pretreatment of glass fiber powder: Take glass fiber powder with an average particle size of 3 μm, in an environment with a vacuum degree of 0.28 Pa, use ultrasonic treatment with a power density of 29 kW / m³ and a frequency of 39 kHz for 9.5 minutes, and simultaneously spray a surfactant solution with a concentration of 1.5 wt% the same as that in Example 1. After treatment, take out the pretreated glass fiber powder. Nanoscale interface modification: Disperse the pretreated glass fiber powder in a 70% ethanol solution, add nano-titanium dioxide sol with a mass fraction of 4.5% of the pretreated glass fiber powder, a concentration of 11.5 wt%, and an average particle size of 28 nm, and graphene quantum dots with a mass fraction of 1.5% and a lateral size of 12 nm. Stir magnetically at 64°C for 38 minutes, and the subsequent treatment is the same as that in Example 1. Preparation of rubber-plastic composite material: The glass fiber powder is mixed with the rubber-plastic matrix at a mass ratio of 13:100, melt-blended at 215°C by a twin-screw extruder, and the screw rotation speed is 195 rpm. The remaining operations are the same as those in Example 1; the mass ratio of ethylene propylene diene monomer rubber to high-density polyethylene is 44:52. Magnetic field-induced orientation treatment: Place the preliminary crossbeam in an alternating magnetic field with a magnetic field strength of 0.95 T, a frequency of 85 Hz, and a gradient magnetic field strength change rate of 0.25 T / m, keep it at 128°C for 14 minutes. The final crossbeam section is I-shaped with a wall thickness of 3 mm.

[0031] Comparative Example 1 This example is made by the following method: Nanoscale interface modification: Disperse the glass fiber powder in a 70% ethanol solution, add nano-titanium dioxide sol with a mass fraction of 3% of the pretreated glass fiber powder, a concentration of 10 wt%, and an average particle size of 20 nm, and graphene quantum dots with a mass fraction of 1.2%, a lateral size of 5 nm, a thickness of ≤5 layers, and hydroxyl and carboxyl functional groups. Stir magnetically at 60°C for 30 minutes, centrifuge and dry at 60°C for 10 h to obtain the modified glass fiber powder. Preparation of rubber-plastic composite material: Mix the modified glass fiber powder and the rubber-plastic matrix in a mass ratio of 8:100, and perform melt blending at 200 °C through a twin-screw extruder with a length-diameter ratio of 38:1 and a screw speed of 180 rpm. After extrusion granulation, injection molding is carried out to form the preliminary crossbeam of the breeding greenhouse; the mass ratio of ethylene propylene diene monomer rubber to high-density polyethylene is 40:60. Magnetic field induced orientation treatment: Place the preliminary crossbeam in an alternating magnetic field with a magnetic flux density of 0.8 T, a frequency of 50 Hz, and a gradient magnetic field strength change rate of 0.1 T / m, keep it at 120 °C for 12 minutes, take it out and cool it naturally to room temperature to obtain the final crossbeam of the breeding greenhouse. The cross-section of the crossbeam is I-shaped and the wall thickness is 3 mm.

[0032] Comparative Example 2 This example is made by the following method: Pretreatment of glass fiber powder: Take glass fiber powder with an average particle size of 3 μm, in an environment with a vacuum degree of 0.2 Pa, perform ultrasonic treatment for 8 minutes with a power density of 25 kW / m³ and a frequency of 35 kHz, and at the same time spray and treat with a surfactant solution with a concentration of 1.2 wt% and a mass ratio of 3:1 of lecithin and cocamidopropyl betaine. After treatment, take out the pretreated glass fiber powder. Preparation of rubber-plastic composite material: Mix the pretreated glass fiber powder and the rubber-plastic matrix in a mass ratio of 8:100, and perform melt blending at 200 °C through a twin-screw extruder with a length-diameter ratio of 38:1 and a screw speed of 180 rpm. After extrusion granulation, injection molding is carried out to form the preliminary crossbeam of the breeding greenhouse; the mass ratio of ethylene propylene diene monomer rubber to high-density polyethylene is 40:60. Magnetic field induced orientation treatment: Place the preliminary crossbeam in an alternating magnetic field with a magnetic flux density of 0.8 T, a frequency of 50 Hz, and a gradient magnetic field strength change rate of 0.1 T / m, keep it at 120 °C for 12 minutes, take it out and cool it naturally to room temperature to obtain the final crossbeam of the breeding greenhouse. The cross-section of the crossbeam is I-shaped and the wall thickness is 3 mm.

[0033] Test Compressive strength test: Refer to GB / T50081-2019 "Standard for Test Methods of Physical and Mechanical Properties of Concrete" to conduct compressive strength tests on the crossbeams of the examples and comparative examples, and compare: Table 1

[0034] It can be seen from Table 1 that the crossbeams for greenhouse supporting prepared by the method of the present invention have excellent mechanical properties.

[0035] Corrosion resistance test: Place the crossbeams of the examples and comparative examples in the corrosive test liquid and soak for 300 h, and observe the appearance change and the reduction rate of compressive strength of the crossbeams: The corrosive test liquid is composed of chicken manure and water mixed in a mass ratio of 1:10; Table 2

[0036] As can be seen from Table 2, the cross beams for greenhouse matching prepared by the method of the present invention have excellent corrosion resistance.

[0037] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for processing supporting beams to increase the life of a breeding greenhouse, characterized in that: The following steps are involved: (1) Pretreatment of glass fiber powder: Place the glass fiber powder in a vacuum environment and treat it with ultrasound at a power density of 25-30kW / m³ for 8-10 minutes. During the ultrasonic treatment, a surfactant solution with a concentration of 1.2-1.6wt% is simultaneously introduced for spray treatment. After the treatment is completed, the pretreated glass fiber powder is taken out; The average particle size of the glass fiber powder is 3 μm; (2) Nano-interface modification: the pretreated glass fiber powder obtained in step (1) is dispersed in a 70% by mass ethanol solution, and then 3-5% by mass of nano-titanium dioxide sol and 1.2-1.6% by mass of graphene quantum dots are added, and then magnetically stirred at 60-65°C for 30-40 minutes, followed by centrifugal separation and drying at 60°C for 10 hours to obtain a twice-modified glass fiber powder; (3) Preparation of rubber-plastic composite materials: The twice-modified glass fiber powder is mixed with the rubber-plastic matrix at a mass ratio of 8-15:100, melt-blended at 200-220°C by a twin-screw extruder, extruded into granules, and then injection molded into preliminary breeding shed beams; (4) Magnetic field induced orientation treatment: Place the preliminary breeding greenhouse beams in a 0.8-1.0T magnetic field, keep it at 120-132°C for 12-15 minutes, then take it out and let it cool naturally to room temperature.

2. The processing method according to claim 1, characterized in that: The vacuum degree of the vacuum environment in step (1) is 0.2-0.3 Pa, and the ultrasonic frequency is 35-40 kHz.

3. The processing method according to claim 1, characterized in that: The surfactant is a compound of lecithin and cocamidopropyl betaine, and the compounding mass ratio is 3:

1.

4. The processing method according to claim 1, characterized in that: The nano titanium dioxide sol in step (2) has a concentration of 10-12 wt % and an average particle size of 20-30 nm.

5. The processing method according to claim 1, characterized in that: The graphene quantum dots in step (2) have a lateral size of 5-15 nm, a thickness of ≤5 layers, and have hydroxyl and carboxyl functional groups on the surface.

6. The processing method according to claim 1, characterized in that: The rubber-plastic matrix is ​​a blend of EPDM rubber and high-density polyethylene, and the blending mass ratio of EPDM rubber to high-density polyethylene is 40-45:50-60.

7. The processing method according to claim 1, characterized in that: The length-to-diameter ratio of the twin-screw extruder is 38:1, and the screw speed is 180-200 rpm.

8. The processing method according to claim 1, characterized in that: In the magnetic field induced orientation treatment in step (4), the alternating magnetic field frequency is 50-100 Hz and the gradient magnetic field intensity change rate is 0.1-0.3 T / m.

9. The processing method according to claim 1, characterized in that: The cross-sectional shape of the breeding greenhouse beam is I-shaped or C-shaped, and the wall thickness is 3-5 mm.

Images