Agricultural and forestry net with light conversion and fertilizer increasing effects and preparation method thereof

Abstract

The present application relates to the technical field of light conversion net, and particularly relates to a kind of light conversion and fertilizer increasing effect net for agriculture and forestry and its preparation method.The net for agriculture and forestry includes the following raw materials by weight: 100 parts of polyester, 10-20 parts of light diffuser, 1.5-2.0 parts of first light conversion agent, 1.5-1.7 parts of second light conversion agent, 1-2 parts of silane coupling agent, and 0.3-0.5 parts of lubricant.The present application introduces silane coupling agent into the raw material of net cloth, which can form the structure of organic matrix-silane coupling agent-inorganic light conversion agent, improve the compatibility of light conversion agent and polyester matrix, prevent light conversion agent from migrating or escaping, improve light conversion performance, and have the technical effect of light conversion and fertilizer increasing.The present application can improve the aging resistance of light conversion net, prolong the service life, and at the same time, has excellent mechanical properties, which can meet the strength requirements of hail prevention net.

Description

Technical Field

[0001] This invention relates to the field of light-converting netting technology, specifically to an agricultural and forestry netting with light-converting and fertilization effects and its preparation method. Background Technology

[0002] Agricultural light-converting nets have broad application prospects in agricultural production. Firstly, they can more effectively convert sunlight into usable light energy for plants, improving crop yield and quality. Secondly, they can also provide some shading and cooling, reducing the negative impact of high summer temperatures on crop growth, thus achieving the technical effect of light-converting and fertilizing crops.

[0003] The light-converting net utilizes a special optical design and material formulation to intelligently absorb and convert specific wavelengths of sunlight. Specifically, it absorbs ultraviolet and green light from sunlight and converts them into blue and red light, which are more beneficial to plant growth. This conversion process increases the blue and red spectral composition within the greenhouse, improving light energy utilization.

[0004] CN101857690A discloses a rare-earth organic complex light-converting film with ultraviolet-to-red light conversion properties and its preparation process. The film is prepared from 80-95 parts by weight of a base HDPE, 0.1-10 parts by weight of a light-converting agent, and 1-10 parts by weight of an additive. The polyethylene light-converting film prepared using this invention has high luminous efficiency and good compatibility with resins; sensitized ion Y 3+ Gd 3+ The introduction of this technology enhances fluorescence emission capabilities, enabling efficient conversion of ultraviolet light with wavelengths of 220–380 nm into red light with wavelengths of 620–760 nm. This facilitates full absorption of light by crops, increasing yield and improving quality.

[0005] CN108276997A discloses a dual rare-earth-doped zirconium oxide light-conversion film, comprising the following components by weight percentage: x% Eu₂O₃, (8-x)% Y₂O₃, and 92% ZrO₂. The preparation method of the light-conversion film involves the entire process of preparing the precursor solution under nitrogen protection (a nitrogen-filled glove box). First, a mixture of ethylene glycol methyl ether and acetylacetone is prepared, with acetylacetone acting as a stabilizer. Then, zirconium propoxide is added to the mixed solvent of ethylene glycol methyl ether and acetylacetone, effectively controlling the hydrolysis of zirconium propoxide. This invention utilizes Y… 3+ Ion doping stabilizes the phase structure of ZrO2 thin films, giving them excellent structure and good electrical properties. This invention utilizes the Eu content in the ZrO2 matrix... 3+ Fluorescence selectively absorbs blue light from visible light sources.

[0006] The defects of the above-mentioned patent are as follows: on the one hand, HDPE is used as the matrix material, and the polyethylene molecular chain of HDPE is easy to break, cross-link and oxidize, resulting in poor anti-aging performance of HDPE material; on the other hand, the light conversion film uses rare earth inorganic light conversion agent, which reduces the compatibility with the matrix material, and the light conversion agent is easy to migrate or escape, which reduces the performance of the light conversion material. Summary of the Invention

[0007] To address the technical problems of existing light-converting net materials, such as poor aging resistance and light conversion, this invention provides an agricultural and forestry net with light conversion and fertilization effects, as well as its preparation method. This method can improve the aging resistance and other properties of the light-converting net, and by utilizing its own light conversion characteristics, it can improve the utilization rate of light energy by crops and achieve the technical effect of fertilization.

[0008] In a first aspect, the present invention provides an agricultural and forestry net with light-converting and fertilizer-enhancing effects, comprising the following raw materials in parts by weight: 100 parts polyester, 10-20 parts light-diffusing agent, 1.5-2.0 parts first light-converting agent, 1.5-1.7 parts second light-converting agent, 1-2 parts silane coupling agent, and 0.3-0.5 parts lubricant.

[0009] Furthermore, polyester includes recycled polyester. Recycled polyester is made from waste polyester products through recycling and processing. In the preparation process, waste polyester products are transformed into recycled polyester through steps such as washing, crushing, and melting, which not only reduces the generation of waste materials but also saves on the use of raw materials.

[0010] Furthermore, the light diffusing agent is an organosilicon light diffusing agent. This type of light diffusing agent is a polymer with a three-dimensional structure linked by silicon-oxygen bonds. Compared with inorganic light diffusing agents, it has high diffusion efficiency, good compatibility with the matrix resin, and good compatibility with organosilicon coupling agents.

[0011] Furthermore, the first light-converting agent is one of 4,4-bis(2-dimethoxystyryl)biphenyl, 4,4'-bis(2-sulfonate styryl)biphenyl, 4,4'-bis(2-benzoxazolyl)stilbene, 4,4'-bis(2-ethylcarboxylate vinyl)stilbene, or 4,4-dicyanovinyl-stilbene. This first light-converting agent is an organic fluorescent molecule that can convert violet light to blue light. The blue light is absorbed by chlorophyll and carotene in plant leaves and then transferred to chlorophyll for photosynthesis, promoting plant growth.

[0012] Furthermore, the second light-converting agent is a rare-earth light-converting agent, which is one of rare-earth silicates, rare-earth phosphates, rare-earth hydrochlorides, or rare-earth nitrates. This second light-converting agent can convert green light into red light, essential for plant photosynthesis.

[0013] Furthermore, the silane coupling agent is silane coupling agent KH560 or silane coupling agent KH570.

[0014] Furthermore, the lubricant is one of polyethylene wax, paraffin wax, or stearic acid.

[0015] Secondly, the present invention provides a method for preparing an agricultural and forestry net with light-converting and fertilization effects, comprising the following steps: (1) Polyester chips are cooled after crystallization, drying, and continuous solid-phase thickening treatment to obtain a polyester carrier; (2) The polyester carrier, light diffusing agent, first light conversion agent, second light conversion agent, and silane coupling agent are mixed in a high-speed mixer. Lubricant is added during the mixing process to obtain a mixture. (3) The mixture is fed into a twin-screw extruder for extrusion and granulation to obtain granulated material; (4) The granulated material is fed into a plastic extruder, heated, melted, extruded, and cooled to obtain nascent filaments; (5) The raw yarn is drawn and then set to obtain recycled yarn; (6) After the recycled yarn passes through the wire pressing device, it is collected and wound into the winding head, which is then loaded into the warp knitting machine to be woven into a mesh fabric.

[0016] Furthermore, in step (1), the polyester chips are crystallized in a crystallizer at a temperature of 130~160℃; the process conditions for continuous solid-phase thickening treatment are to heat the polyester chips to 200~240℃ and introduce circulating nitrogen during the heating process.

[0017] Furthermore, in step (4), the plastic extruder is heated and melted in sections. The heating temperature of the first section is 175~180℃, the heating temperature of the second section is 195~200℃, the heating temperature of the third section is 225~245℃, the heating temperature of the fourth section is 265~275℃, the heating temperature of the fifth section is 285~295℃, and the heating temperature of the sixth section is 285~300℃.

[0018] The beneficial effects of this invention are as follows: (1) By introducing a silane coupling agent into the mesh fabric raw material, the present invention can form an organic matrix-silane coupling agent-inorganic light-converting agent structure, improve the compatibility between the light-converting agent and the polyester matrix, prevent the migration or escape of the light-converting agent, improve the light-converting performance, and have the technical effect of light-converting and fattening.

[0019] (2) The raw material polyester of the present invention first undergoes continuous solid phase thickening treatment, which has the effect of increasing the viscosity of the material and removing impurities in the material. This is beneficial for the subsequent brightening agent, silane coupling agent and other components to be uniformly attached to the surface of the polyester carrier, thereby improving the forming performance of subsequent extrusion filament.

[0020] (3) The present invention can improve the aging resistance of the light conversion net and extend its service life. At the same time, it has excellent mechanical properties and can meet the strength requirements of the hail protection net. Detailed Implementation

[0021] To enable those skilled in the art to better understand the technical solutions of this invention, the technical solutions in the embodiments of this invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this invention.

[0022] Example 1 A net for agricultural and forestry use with light-converting and fertilizer-enhancing effects comprises the following raw materials in parts by weight: 100 parts polyester, 15 parts organosilicon light diffusing agent EL120, 2.0 parts 4,4-bis(2-dimethoxystyryl)biphenyl, 1.6 parts rare earth silicate light-converting agent, 1.5 parts silane coupling agent KH560, and 0.4 parts stearic acid.

[0023] A method for preparing agricultural and forestry nets with light-converting and fertilizer-enhancing effects using the above-mentioned raw materials includes: (1) Polyester chips are crystallized in a crystallizer at a crystallization temperature of 150°C. After crystallization, continuous solid-phase thickening treatment is carried out. The process conditions are: the polyester chips are heated to 220°C, and circulating nitrogen is introduced during the heating process and then cooled to obtain a polyester carrier. (2) Polyester carrier, EL120, 4,4-bis(2-dimethoxystyryl)biphenyl, rare earth silicate light conversion agent, and KH560 are mixed in a high-speed mixer. Stearic acid is added during the mixing process to obtain a mixture. (3) The mixture is fed into a twin-screw extruder for high-temperature extrusion and granulation to obtain granulated material; (4) The granulated material is fed into the plastic extruder, heated, melted, extruded and cooled. The plastic extruder is heated in sections. The heating temperature of the first section is 175~180℃, the heating temperature of the second section is 195~200℃, the heating temperature of the third section is 225~245℃, the heating temperature of the fourth section is 265~275℃, the heating temperature of the fifth section is 285~295℃, and the heating temperature of the sixth section is 285~300℃ to obtain the nascent filament. (5) The raw yarn is drawn and then high-temperature set to obtain recycled yarn; (6) After the recycled yarn passes through the wire pressing device, it is collected and wound into the winding head, which is then loaded into the warp knitting machine to be woven into a mesh fabric.

[0024] Example 2 A net for agricultural and forestry use with light-converting and fertilizer-enhancing effects comprises the following raw materials in parts by weight: 100 parts polyester, 10 parts organosilicon light-diffusing agent EL120, 1.5 parts 4,4-dicyanovinyl-stilbene, 1.5 parts rare earth phosphate light-converting agent, 1.0 part silane coupling agent KH560, and 0.5 parts polyethylene wax.

[0025] A method for preparing agricultural and forestry nets with light-converting and fertilizer-enhancing effects using the above-mentioned raw materials includes: (1) Polyester chips are crystallized in a crystallizer at a crystallization temperature of 130°C. After crystallization, continuous solid-phase thickening treatment is carried out. The process conditions are: the polyester chips are heated to 200°C, circulating nitrogen is introduced during the heating process, and then cooled to obtain a polyester carrier. (2) Polyester carrier, EL120, 4,4-dicyanovinyl-stilbene, rare earth phosphate light conversion agent, and KH560 are mixed in a high-speed mixer. Polyethylene wax is added during the mixing process to obtain a mixture. (3) The mixture is fed into a twin-screw extruder for high-temperature extrusion and granulation to obtain granulated material; (4) The granulated material is fed into the plastic extruder, heated, melted, extruded and cooled. The plastic extruder is heated in sections. The heating temperature of the first section is 175~180℃, the heating temperature of the second section is 195~200℃, the heating temperature of the third section is 225~245℃, the heating temperature of the fourth section is 265~275℃, the heating temperature of the fifth section is 285~295℃, and the heating temperature of the sixth section is 285~300℃ to obtain the nascent filament. (5) The raw yarn is drawn and then high-temperature set to obtain recycled yarn; (6) After the recycled yarn passes through the wire pressing device, it is collected and wound into the winding head, which is then loaded into the warp knitting machine to be woven into a mesh fabric.

[0026] Example 3 A net for agricultural and forestry use with light-converting and fertilizer-enhancing effects comprises the following raw materials in parts by weight: 100 parts polyester, 20 parts organosilicon light-diffusing agent EL120, 2.0 parts 4,4-bis(2-dimethoxystyryl)biphenyl, 1.7 parts rare earth silicate light-converting agent, 2.0 parts silane coupling agent KH560, and 0.5 parts stearic acid.

[0027] A method for preparing agricultural and forestry nets with light-converting and fertilizer-enhancing effects using the above-mentioned raw materials includes: (1) Polyester chips are crystallized in a crystallizer at a crystallization temperature of 160°C. After crystallization, continuous solid-phase thickening treatment is carried out. The process conditions are: the polyester chips are heated to 240°C, and circulating nitrogen is introduced during the heating process and then cooled to obtain a polyester carrier. (2) Polyester carrier, EL120, 4,4-bis(2-dimethoxystyryl)biphenyl, rare earth silicate light conversion agent, and KH560 are mixed in a high-speed mixer. Stearic acid is added during the mixing process to obtain a mixture. (3) The mixture is fed into a twin-screw extruder for high-temperature extrusion and granulation to obtain granulated material; (4) The granulated material is fed into the plastic extruder, heated, melted, extruded and cooled. The plastic extruder is heated in sections. The heating temperature of the first section is 175~180℃, the heating temperature of the second section is 195~200℃, the heating temperature of the third section is 225~245℃, the heating temperature of the fourth section is 265~275℃, the heating temperature of the fifth section is 285~295℃, and the heating temperature of the sixth section is 285~300℃ to obtain the nascent filament. (5) The raw yarn is drawn and then high-temperature set to obtain recycled yarn; (6) After the recycled yarn passes through the wire pressing device, it is collected and wound into the winding head, which is then loaded into the warp knitting machine to be woven into a mesh fabric.

[0028] This invention introduces a silane coupling agent into the fabric raw material, forming an organic matrix-silane coupling agent-inorganic light-converting agent structure. This improves the compatibility of the light-converting agent with the polyester matrix, prevents the migration or escape of the light-converting agent, and enhances the light conversion performance. This invention uses 365nm ultraviolet light to excite the fabrics prepared in Examples 1, 2, and 3. Under ultraviolet light, all the fabrics prepared in these examples emit blue light with a wavelength of 463nm. Similarly, using 515nm green light to excite the fabrics prepared in Examples 1, 2, and 3, all the fabrics prepared in these examples emit red light with a wavelength of 627nm under green light. This invention can simultaneously achieve the light conversion effect of converting violet light to blue light and green light to red light. The conversion of violet light to blue light promotes the transformation of ultraviolet rays in sunlight into blue light. This blue light is then absorbed by chlorophyll and carotene in plant leaves and transferred to chlorophyll for photosynthesis, promoting plant growth. Simultaneously, the conversion of green light to red light enhances photosynthesis and absorption, increasing leaf area and chlorophyll content, thereby improving photosynthetic efficiency and growth rate. It also regulates plant growth rhythms, accelerates metabolism, promotes flowering and fruiting, improves plant quality and nutritional value, increases vitamin C and carotenoid content, enhances antioxidant capacity and taste, and increases overall plant value. This achieves the technical effect of light-based fertilization.

[0029] Meanwhile, birds are sensitive to colors such as red and blue. Bird nets of these colors can refract sunlight to emit red or blue light, deterring birds from approaching. This prevents birds from pecking at fruit while also avoiding collisions with the nets, achieving a deterrent effect without harming the birds. This invention allows for the design of different colored nets to suit various regional environments, achieving the best overall effect.

[0030] Comparative Example 1 The difference between Comparative Example 1 and Example 1 is that the polyester was replaced with HDPE.

[0031] The mesh fabrics prepared in Example 1 and Comparative Example 1 were attached to the surface of the roof of an agricultural greenhouse and used under the same conditions. Their mechanical properties were tested, and the specific results are shown in Table 1.

[0032] Table 1 Mechanical property testing of mesh fabrics in the examples and comparative examples

[0033] As shown in Table 1, compared to Comparative Example 1, the mesh fabric prepared by this invention exhibits a better rate of decrease in tensile load, elongation at break, and right-angle tear load mechanical properties over time. This indicates that the aging resistance of this invention is improved compared to the comparative example. Table 1 also shows that the mesh fabric prepared by this invention has better strength, meeting the requirements for hail protection nets.

[0034] The safety performance of the mesh fabric prepared in Example 2 was tested, and the specific results are shown in Table 2.

[0035] Table 2 Performance test of the safety net fabric prepared in Example 2

[0036] Although the present invention has been described in detail by way of preferred embodiments, the present invention is not limited thereto. Various equivalent modifications or substitutions can be made to the embodiments of the present invention by those skilled in the art without departing from the spirit and essence of the invention, and such modifications or substitutions should all be within the scope of the present invention. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should also be covered within the protection scope of the present invention.

Claims

1. An agricultural and forestry net with light-converting and fertilization-enhancing effects, characterized in that, The raw materials include the following parts by weight: 100 parts polyester, 10-20 parts light diffusing agent, 1.5-2.0 parts first light conversion agent, 1.5-1.7 parts second light conversion agent, 1-2 parts silane coupling agent, and 0.3-0.5 parts lubricant; The light diffusing agent is an organosilicon light diffusing agent; A method for preparing agricultural and forestry nets with light-converting and fertilization effects includes the following steps: (1) Polyester chips are cooled after crystallization, drying, and continuous solid-phase thickening treatment to obtain a polyester carrier; (2) The polyester carrier, light diffusing agent, first light conversion agent, second light conversion agent, and silane coupling agent are mixed in a high-speed mixer. Lubricant is added during the mixing process to obtain a mixture. (3) The mixture is fed into a twin-screw extruder for extrusion and granulation to obtain granulated material; (4) The granulated material is fed into a plastic extruder, heated, melted, extruded, and cooled to obtain nascent filaments; (5) The raw yarn is drawn and then set to obtain recycled yarn; (6) After the recycled yarn passes through the wire pressing device, it is collected and wound into the winding head, which is then loaded into the warp knitting machine to be woven into a mesh fabric; The second light-converting agent is a rare earth light-converting agent, which is one of rare earth phosphate, rare earth hydrochloride, and rare earth nitrate. In step (1), the polyester chips are crystallized in a crystallizer at a temperature of 150°C; the process conditions for continuous solid-phase thickening treatment are as follows: the polyester chips are heated to 210°C and circulating nitrogen is introduced during the heating process. In step (4), the plastic extruder is heated and melted in sections. The heating temperature of section one is 177℃, the heating temperature of section two is 195℃, the heating temperature of section three is 230℃, the heating temperature of section four is 270℃, the heating temperature of section five is 290℃, and the heating temperature of section six is ​​290℃.

2. The agricultural and forestry net with light-converting and fertilization effects as described in claim 1, characterized in that, Polyesters include recycled polyester.

3. The agricultural and forestry net with light-converting and fertilization effects as described in claim 1, characterized in that, The first light-converting agent is one of 4,4-bis(2-dimethoxystyryl)biphenyl, 4,4'-bis(2-sodium sulfonate styryl)biphenyl, 4,4'-bis(2-benzoxazolyl)stilbene, 4,4'-bis(2-ethylcarbamate vinyl)stilbene, or 4,4-dicyanovinyl-stilbene.

4. The agricultural and forestry net with light-converting and fertilization effects as described in claim 1, characterized in that, The silane coupling agent is either silane coupling agent KH560 or silane coupling agent KH570.

5. The agricultural and forestry net with light-converting and fertilization effects as described in claim 1, characterized in that, The lubricant is one of polyethylene wax, paraffin wax, or stearic acid.

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