CN114311888A - Grass prevention pad and preparation method and application thereof - Google Patents
Grass prevention pad and preparation method and application thereof Download PDFInfo
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- CN114311888A CN114311888A CN202111651581.1A CN202111651581A CN114311888A CN 114311888 A CN114311888 A CN 114311888A CN 202111651581 A CN202111651581 A CN 202111651581A CN 114311888 A CN114311888 A CN 114311888A
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Abstract
The invention relates to a grass-proof mat and a preparation method and application thereof, wherein the grass-proof mat comprises a polymer composite fiber non-woven fabric layer; the polymer composite fiber non-woven fabric layer comprises polymer composite fibers and a weather-resistant coating arranged on the surfaces of the polymer composite fibers; the polymer composite fiber includes a polymer and a white filler. The grass prevention mat has the advantages of simple structure, low price, good grass prevention effect and longer service life.
Description
Technical Field
The invention relates to the technical field of photovoltaic modules, in particular to a grass prevention mat and a preparation method and application thereof.
Background
Weeds around the existing photovoltaic power station are clustered, and often need to be cleaned regularly, so that the cost of manpower and material resources is high, the power generation efficiency of a photovoltaic module is affected if the weeds are not cleaned in time, and a hot spot effect is generated.
One of the current treatments is direct weeding.
CN111357468A discloses a full-automatic weeding robot for photovoltaic power plant, its robot that discloses has realized the full-automatic weeding of photovoltaic power plant through the cooperation of each module of central control module, motion processing module, weeds identification module, weeding module, weeds processing module, power module, and through its disclosed technical scheme, the user can be as required, the full-automatic incessant weeding of every day, stop the weeding problem of current photovoltaic power plant, reduce the fortune dimension expense of photovoltaic power plant, show and improve the generating efficiency, do not influence environmental protection simultaneously.
However, the above method is complicated in operation, and a more desirable treatment is to provide a grass mat.
CN106637674A discloses a grass-prevention mat and a processing technology thereof, aiming at solving the problem of poor grass-prevention effect of the traditional grass-prevention mat; its technical scheme main points are prevent grass pad, including bottom and top layer, the bottom is the spunbonded nonwoven who is made by the dacron, and the top layer is the acupuncture non-woven who is made by the dacron, be provided with high-pressure low density polyethylene material between bottom and the top layer to connect through high-pressure low density polyethylene material, the particle diameter of high-pressure low density polyethylene material is below 40 meshes, and high-pressure low density polyethylene material evenly distributed is between bottom and top layer, and its quality is 25 ~ 35g/m2The density of the bottom layer is 135-180 g/m2The thickness is 0.4-0.6 mm, and the thickness of the surface layer is 1.5-2.5 mm.
The disclosed grass prevention mat has good grass prevention effect, but the structure and the process are complex, and the cost is higher.
In conclusion, it is important to develop a grass-prevention mat which has a simple structure, a low price and a good grass-prevention effect.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a grass prevention mat, a preparation method and application thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the present invention provides a grass protection mat comprising a polymer composite fibre nonwoven layer;
the polymer composite fiber non-woven fabric layer comprises polymer composite fibers and a weather-resistant coating arranged on the surfaces of the polymer composite fibers;
the polymer composite fiber includes a polymer and a white filler.
The grass prevention mat can achieve a good grass prevention effect through a single-layer structure, and the weather-resistant coating can ensure the service life of the grass prevention mat; the polymer composite fiber contains white filler, so that ultraviolet rays can be reflected, the service life of the grass mat is prolonged, the overall reflectivity of the grass mat can be improved, a high-reflection effect is provided, sunlight is reflected back to the photovoltaic component again, and the power generation efficiency of the component is improved.
Preferably, the white filler accounts for 1 to 30 mass percent, such as 2, 5, 10, 15, 20, 25, etc., and more preferably 5 to 20 mass percent, based on 100 mass percent of the total mass of the polymer composite fiber
In the polymer composite fiber of the grass mat, when the mass fraction of the white filler is less than 1%, the light scattered by the inorganic filler is insufficient, and high reflection performance is difficult to obtain. And when the white filler mass fraction is more than 30%, the mechanical properties of the polymer fiber may be affected.
Preferably, the polymer comprises any one of polypropylene, polyethylene or polyethylene terephthalate.
Preferably, the white filler comprises any one of titanium dioxide, calcium carbonate or barium sulfate or a combination of at least two thereof, wherein typical but non-limiting combinations include: titanium dioxide and calcium carbonate, calcium carbonate and barium sulfate, titanium dioxide, calcium carbonate and barium sulfate, and the like.
Preferably, the thickness of the polymer composite fiber nonwoven layer is 50 μm to 1000 μm, such as 100 μm, 200 μm, 300 μm, 400 μm, 500 μm, 600 μm, 700 μm, 800 μm, 900 μm, and the like.
The thickness of the polymer composite fiber non-woven fabric layer is within the range, so that the good grass prevention performance, the good reflection performance and the good cost performance are provided; if the thickness is too high, the cost is high; too low a thickness does not provide adequate weed control and weeds may penetrate from the mat and the reflective properties are poor.
Preferably, the weatherable coating has a thickness of 1 μm to 50 μm, such as 5 μm, 10 μm, 15 μm, 20 μm, 25 μm, 30 μm, 35 μm, 40 μm, 45 μm, and the like.
Preferably, the weatherable coating includes a weatherable resin, a filler, and an auxiliary.
Preferably, the weatherable resin comprises any one of fluorocarbon resin, acrylic resin, or polyester resin, or a combination of at least two thereof, wherein typical but non-limiting combinations include: combinations of fluorocarbon resins and acrylic resins, combinations of acrylic resins and polyester resins, combinations of fluorocarbon resins, acrylic resins, and polyester resins, and the like.
Preferably, the filler comprises any one or a combination of at least two of titanium dioxide, calcium carbonate, barium sulfate, lithopone or lithopone, wherein typical but non-limiting combinations include: the combination of titanium dioxide and calcium carbonate, the combination of barium sulfate, lithopone and zinc white, the combination of calcium carbonate, barium sulfate, lithopone and zinc white, and the like.
Preferably, the auxiliary agent is any one of a cross-linking agent, a solvent, a dispersing agent, a light stabilizer, a heat stabilizer, an antifoaming agent, and a leveling agent, or a combination of at least two of the foregoing, wherein a typical but non-limiting combination includes: a combination of a crosslinking agent, a solvent and a dispersing agent, a combination of a light stabilizer, a heat stabilizer, a defoaming agent and a leveling agent, a combination of a crosslinking agent, a solvent, a dispersing agent, a light stabilizer and a heat stabilizer, and the like.
Preferably, the grass protection mat further comprises a fire-resistant layer.
The fireproof layer can be arranged on the grass prevention mat, so that the grass prevention mat is prevented from burning, a fire source is isolated, and the safety of the photovoltaic power station is effectively improved.
Preferably, the fireproof layer comprises any one of glass fiber cloth, silica gel glass fiber fireproof cloth, basalt fiber fireproof cloth, aluminum foil fireproof cloth, acrylic fiber fireproof cloth or high silica fireproof cloth.
Preferably, the thickness of the fire-blocking layer is 50 μm to 500 μm, such as 100 μm, 200 μm, 300 μm, 400 μm, 500 μm, and the like.
In a second aspect, the present invention provides a method for preparing a grass protection mat according to the first aspect, the method comprising the steps of:
(1) uniformly mixing a polymer and a white pigment, granulating, and then carrying out melt extrusion spinning to form a polymer composite fiber;
(2) carrying out a web-forming hot rolling process on the polymer composite fibers to obtain polymer fiber non-woven fabrics;
(3) and coating the raw material of the weather-resistant coating on the polymer fiber non-woven fabric, and drying to obtain the polymer composite fiber non-woven fabric with the weather-resistant coating coated on the surface, namely the grass mat.
Preferably, in the step (3), the raw material of the weather-resistant resin coating layer is applied by a coating method including dip coating.
Preferably, said dip coating comprises in particular: and (3) rapidly passing the polymer composite fiber non-woven fabric through a coating tank containing the weather-resistant coating, and drying by using an oven to obtain the polymer fiber non-woven fabric coated with the weather-resistant coating.
Preferably, the preparation method further comprises the operation of arranging a fire-retardant layer on the surface of the polymer composite fiber non-woven fabric coated with the weather-resistant coating.
Preferably, the setting mode comprises adhesive bonding or hot-press bonding.
In a third aspect, the present invention provides a use of the grass protection mat of the first aspect in a photovoltaic module.
Compared with the prior art, the invention has the following beneficial effects:
(1) the grass-proof mat has the advantages of simple structure, good water permeability and grass-proof effect, longer service life and capability of being provided with a fireproof layer according to requirements; and the high reflection effect is outstanding, can improve the generating efficiency of subassembly.
(2) The grass growing area of the grass prevention mat accounts for within 5.7 percent of the total area, the light reflection rate is over 71 percent, and the UV800KWh breaking elongation rate is over 32 percent.
Drawings
FIG. 1 is a schematic structural view of the grass protection mat according to example 1;
1-a polymer composite fiber nonwoven layer; 2-fireproof layer.
Detailed Description
For the purpose of facilitating an understanding of the present invention, the present invention will now be described by way of examples. It should be understood by those skilled in the art that the examples are only for the understanding of the present invention and should not be construed as the specific limitations of the present invention.
Example 1
The embodiment provides a grass mat, the structure of which is schematically shown in fig. 1, and the grass mat comprises a polymer composite fiber non-woven fabric layer 1 and a fire-proof layer 2 which are arranged in a stacking mode.
The polymer composite fiber non-woven fabric layer: the thickness is 150 μm; the coating consists of polypropylene composite fibers and a weather-resistant coating arranged on the surfaces of the polypropylene composite fibers;
polypropylene composite fibers: adding 10 mass percent of titanium dioxide, purchasing polypropylene from Yangzi petrochemical, wherein the mark is K8003, purchasing titanium dioxide from DuPont, and the mark is R350;
weather-resistant coating: the coating is 5 mu m thick and comprises 50 mass percent of fluorocarbon resin, 40 mass percent of titanium dioxide, 7 mass percent of cross-linking agent, 2 mass percent of light stabilizer and 1 mass percent of dispersant, wherein the fluorocarbon resin is purchased from Aifu, and the brand is ZHM-2; titanium dioxide is purchased from dupont and is marked with R960; the cross-linking agent is purchased from Wanhua chemical and is marked by HT-100; light stabilizers were purchased from basf under the designation Tinuvin 400.
The thickness of the fireproof layer is 200 mu m, the material is glass fiber cloth, and the fireproof layer is purchased from Honghu and science and technology and is provided with the mark of 7628.
The preparation method of the grass protection mat comprises the following steps:
(1) uniformly mixing polypropylene and titanium dioxide, granulating, melting, extruding and spinning to form polymer composite fibers, and performing a web-forming hot rolling process to obtain polypropylene fiber non-woven fabrics;
(2) coating a layer of raw material of the weather-resistant coating on the polypropylene fiber non-woven fabric in a dip-coating mode, and drying to obtain the polypropylene composite fiber non-woven fabric with the weather-resistant coating coated on the surface;
(3) and (3) attaching a layer of glass fiber fireproof cloth in a hot pressing mode to obtain the weather-resistant polypropylene fiber non-woven cloth grass mat with the fireproof layer.
Example 2
This embodiment provides a grass protection mat, the grass protection mat is single-layer structure, constitutes by polymer composite fiber non-woven fabrics layer.
The polymer composite fiber non-woven fabric layer: the thickness is 200 μm; the coating consists of polypropylene composite fibers and a weather-resistant coating arranged on the surfaces of the polypropylene composite fibers;
polypropylene composite fibers: adding 10 mass percent of titanium dioxide, purchasing polypropylene from Yangzi petrochemical, wherein the mark is K8003, purchasing titanium dioxide from DuPont, and the mark is R350;
weather-resistant coating: the coating is 5 mu m thick and comprises 50 mass percent of fluorocarbon resin, 40 mass percent of titanium dioxide, 7 mass percent of cross-linking agent, 2 mass percent of light stabilizer and 1 mass percent of dispersant, wherein the fluorocarbon resin is purchased from Aifu, and the brand is ZHM-2; titanium dioxide is purchased from dupont and is marked with R960; the cross-linking agent is purchased from Wanhua chemical and is marked by HT-100; light stabilizers were purchased from basf under the designation Tinuvin 400.
The preparation method of the grass protection mat comprises the following steps:
(1) uniformly mixing polypropylene and titanium dioxide, granulating, melting, extruding and spinning to form polymer composite fibers, and performing a web-forming hot rolling process to obtain polypropylene fiber non-woven fabrics;
(2) and coating the raw material of the weather-resistant coating on the polypropylene fiber non-woven fabric in a dip-coating manner, and drying to obtain the polypropylene composite fiber non-woven fabric grass mat with the weather-resistant coating on the surface.
Example 3
This embodiment provides a grass protection mat, the grass protection mat is single-layer structure, constitutes by polymer composite fiber non-woven fabrics layer.
The polymer composite fiber non-woven fabric layer: the thickness is 250 μm; the coating consists of polyethylene composite fibers and a weather-resistant coating arranged on the surfaces of the polyethylene composite fibers;
polyethylene composite fiber: adding 10% of titanium dioxide by mass, wherein polyethylene is purchased from China petrochemical industry and the brand number is 500S, and the titanium dioxide is purchased from python and the brand number is R996;
weather-resistant coating: the coating is 10 mu m thick and 10 mu m thick, and comprises 55 mass percent of acrylic resin, 35 mass percent of titanium dioxide, 6 mass percent of cross-linking agent, 3 mass percent of light stabilizer and 1 mass percent of dispersing agent, wherein the acrylic resin is purchased from Changxing chemical and is of the brand ETERAC 7305; titanium dioxide is purchased from DuPont and is marked with R706; the cross-linking agent is purchased from Wanhua chemical and is marked by HT-100; light stabilizers were purchased from basf under the designation Tinuvin 400.
The preparation method of the grass protection mat comprises the following steps:
(1) uniformly mixing polyethylene and titanium dioxide, granulating, melting, extruding and spinning to form polymer composite fibers, and performing a web-forming hot rolling process to obtain polyethylene fiber non-woven fabrics;
(2) and coating the raw materials of the weather-resistant coating on the polyethylene fiber non-woven fabric in a dip-coating mode, and drying to obtain the polyethylene composite fiber non-woven fabric grass mat with the weather-resistant coating coated on the surface.
Example 4
This embodiment provides a grass protection mat, the grass protection mat is single-layer structure, constitutes by polymer composite fiber non-woven fabrics layer.
The polymer composite fiber non-woven fabric layer: the thickness is 300 mu m; the coating is composed of polyethylene terephthalate composite fibers and a weather-resistant coating arranged on the surfaces of the polyethylene terephthalate composite fibers;
polyethylene terephthalate composite fiber: adding 10% of titanium dioxide by mass, wherein polyester chips (polyethylene terephthalate) are purchased from Jiangsu constant force with the brand number of CH-390, and the titanium dioxide is purchased from python Bailey Union with the brand number of R996;
weather-resistant coating: the coating is 10 mu m thick and comprises 55 mass percent of acrylic resin, 35 mass percent of titanium dioxide, 6 mass percent of cross-linking agent, 3 mass percent of light stabilizer and 1 mass percent of dispersing agent, wherein the acrylic resin is purchased from Changxing chemical and is of the brand ETERAC 7305; titanium dioxide is purchased from DuPont and is marked with R706; the cross-linking agent is purchased from Wanhua chemical and is marked by HT-100; light stabilizers were purchased from basf under the designation Tinuvin 400.
The preparation method of the grass protection mat comprises the following steps:
(1) uniformly mixing polyester chips and white pigment, granulating, melting, extruding and spinning to form polymer composite fiber, and performing a web-forming hot rolling process to obtain polyethylene terephthalate composite fiber non-woven fabric;
(2) coating a layer of raw material of the weather-resistant coating on the polyethylene terephthalate composite fiber non-woven fabric in a dip-coating mode, and drying to obtain the polyethylene terephthalate composite fiber non-woven fabric with the weather-resistant coating coated on the surface;
(3) and (3) attaching a layer of glass fiber fireproof cloth in a hot pressing mode to obtain the weather-resistant polyethylene terephthalate composite fiber non-woven cloth grass mat with the fireproof layer.
Examples 5 to 8
Examples 5 to 8 differ from example 1 in the mass fraction of titanium dioxide in the polypropylene fiber, namely 5% (example 5), 8% (example 6), 15% (example 7) and 20% (example 8), and the rest is the same as example 1.
Comparative example 1
The comparative example is different from the example 2 in that titanium dioxide is not added, and the rest is the same as the example 2.
Comparative example 2
The comparative example provides a commercial grass protection mat which is made of polypropylene non-woven fabric and has a thickness of 200 mu m.
Performance testing
The grass mats described in examples 1-8 and comparative examples 1-2 were subjected to the following tests:
(1) the grass prevention effect is as follows: calculating the long grass area/total area, namely respectively paving the grass protection mats described in the embodiments 1-8 and the comparative examples 1-2 on 10-square meter ground, standing for 6 months, and calculating the long grass area/total area, wherein the lower the proportion is, the better the grass protection effect is;
(2) light reflection rate: testing the reflectivity of the grass-prevention mat at 400-1100nm and testing an instrument Shimadzu spectrophotometer;
(3) service life: the elongation at break of the grass mat after UV800KWh was measured according to the theoretical exposure per year calculated according to 100KWh, and the condition of the grass mat after 8 years of use was measured.
The test results are summarized in table 1.
TABLE 1
As can be seen from the analysis table 1, the grass protection mat is simple in structure, good in grass protection effect, resistant to UV aging, long in service life and capable of being provided with a fireproof layer according to needs; and the high reflection effect is outstanding, can improve the generating efficiency of subassembly. The grass growing area of the grass prevention mat accounts for within 5.7 percent of the total area, the light reflection rate is over 71 percent, and the UV800KWh breaking elongation rate is over 32 percent.
As can be seen from the analysis of comparative example 1 and example 2, the performance of comparative example 1 is inferior to that of example 2, and the addition of the white filler into the polymer fiber of the grass mat proves that the reflectance is higher, the elongation at break is better after UV aging, and the service life is longer.
Analysis of comparative example 2 and example 2 revealed that comparative example 2 was inferior in performance to example 2, demonstrating that the grass protection mats of the present invention are superior to the conventional grass protection mats of the prior art.
Analysis of examples 5-8 shows that examples 5-6 are different from examples 7-8, and prove that the addition of titanium dioxide to the grass mat prevention polymer composite fiber has higher reflectivity and better performance, and the reflection performance of the grass mat prevention is improved along with the increase of the proportion of the titanium dioxide.
The applicant states that the present invention is illustrated in detail by the above examples, but the present invention is not limited to the above detailed methods, i.e. it is not meant that the present invention must rely on the above detailed methods for its implementation. It should be understood by those skilled in the art that any modification of the present invention, equivalent substitutions of the raw materials of the product of the present invention, addition of auxiliary components, selection of specific modes, etc., are within the scope and disclosure of the present invention.
Claims (10)
1. A grass protection mat comprising a nonwoven layer of polymer composite fibers;
the polymer composite fiber non-woven fabric layer comprises polymer composite fibers and a weather-resistant coating arranged on the surfaces of the polymer composite fibers;
the polymer composite fiber includes a polymer and a white filler.
2. The grass mat as claimed in claim 1, wherein the white filler accounts for 5 to 20 mass percent of the total mass of the polymer composite fibers being 100 percent;
preferably, the polymer comprises any one of polypropylene, polyethylene or polyethylene terephthalate;
preferably, the white filler comprises any one of titanium dioxide, calcium carbonate or barium sulfate or a combination of at least two of the titanium dioxide, the calcium carbonate or the barium sulfate.
3. A grass protection mat according to claim 1 or 2, characterized in that the thickness of the polymer composite fibre non-woven fabric layer is 50 μm-1000 μm.
4. A grass protection mat according to any one of claims 1 to 3, characterized in that the thickness of the weather-resistant coating is between 1 μm and 50 μm;
preferably, the weatherable coating includes a weatherable resin, a filler, and an auxiliary;
preferably, the weather-resistant resin comprises any one of fluorocarbon resin, acrylic resin or polyester resin or a combination of at least two of them;
preferably, the filler comprises any one or a combination of at least two of titanium dioxide, calcium carbonate, barium sulfate, lithopone or lithopone;
preferably, the auxiliary agent comprises any one of a cross-linking agent, a solvent, a dispersing agent, a light stabilizer, a heat stabilizer, an antifoaming agent or a leveling agent or a combination of at least two of the above.
5. A grass protection mat according to any one of claims 1 to 4, which also includes a fire resistant layer.
6. The grass protection mat according to claim 5, wherein the fire-resistant layer comprises any one of a glass fiber cloth, a silica gel glass fiber fire-resistant cloth, a basalt fiber fire-resistant cloth, an aluminum foil fire-resistant cloth, an acrylic fiber fire-resistant cloth, or a high silica fire-resistant cloth;
preferably, the thickness of the fire-proof layer is 50 μm to 500 μm.
7. A method of making a grass protection mat according to any one of claims 1 to 6, characterized in that it comprises the following steps:
(1) uniformly mixing a polymer and a white pigment, granulating, and then carrying out melt extrusion spinning to form a polymer composite fiber;
(2) carrying out a web-forming hot rolling process on the polymer composite fibers to obtain polymer fiber non-woven fabrics;
(3) and coating the raw material of the weather-resistant coating on the polymer fiber non-woven fabric, and drying to obtain the polymer composite fiber non-woven fabric with the weather-resistant coating coated on the surface, namely the grass mat.
8. The production method according to claim 7, wherein in the step (3), the raw material of the weather-resistant resin coating layer is applied in a manner including dip coating.
9. The manufacturing method according to claim 7 or 8, further comprising an operation of providing a fire-retardant layer on the surface of the polymer composite fiber nonwoven fabric coated with the weather-resistant coating layer;
preferably, the setting mode comprises adhesive bonding or hot-press bonding.
10. Use of a grass protection mat according to any of claims 1 to 6 in a photovoltaic module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111651581.1A CN114311888A (en) | 2021-12-30 | 2021-12-30 | Grass prevention pad and preparation method and application thereof |
Applications Claiming Priority (1)
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