Agricultural greenhouse film with low thermal conductivity

Abstract

The utility model discloses an agricultural greenhouse film with low thermal conductivity, relates to the technical field of greenhouse films, and mainly aims to improve the heat preservation property, the light transmission property and the light energy utilization rate of a multi-layer composite film in the prior art. According to the main technical scheme, the agricultural greenhouse film with the low thermal conductivity comprises a heat preservation and insulation layer, a dimming layer and an anti-aging layer which are sequentially arranged from bottom to top; wherein the heat preservation and insulation layer is formed by uniformly mixing a thermoplastic polymer and silicon dioxide aerogel powder.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of shed film, especially to a low heat conduction agricultural shed film. BACKGROUND

[0002] In facility agriculture, the heat insulation performance of light-transmitting materials is crucial to the energy consumption of production.

[0003] The current single-layer shed film has a single advantage, and the multi-layer shed film loses part of the light-transmitting effect when realizing the heat preservation function, especially in poor weather conditions, which aggravates the light deficiency of crops in the shed.

[0004] Air gel has good light transmittance and heat insulation performance. Therefore, the heat insulation advantage of air gel combined with light-transmitting materials in facility agriculture has good application prospects in energy saving. However, the ultimate tensile strength of air gel is small, and the whole air gel cannot be made into a film. UTILITY MODEL CONTENT

[0005] Therefore, the utility model embodiment provides a low heat conduction agricultural shed film, and the main purpose is to improve the heat preservation, light transmittance, and light energy utilization rate of the multi-layer composite film in the prior art.

[0006] To achieve the above purpose, the utility model mainly provides the following technical scheme:

[0007] The utility model embodiment provides a low heat conduction agricultural shed film, which comprises:

[0008] The heat preservation and insulation layer, the light adjusting layer, and the anti-aging layer are arranged in sequence from bottom to top.

[0009] The heat preservation and insulation layer is uniformly mixed by a thermoplastic polymer and a silica aerogel powder.

[0010] The purpose of the utility model and the technical problems thereof can also be further realized by the following technical measures.

[0011] Optionally, the thermoplastic polymer is a mixture of polyethylene and polyvinyl acetate, and the thickness of the heat preservation and insulation layer is 20-40 microns.

[0012] Optionally, the light adjusting layer uses polyethylene as a base material and adds 10% of a rare earth light conversion agent.

[0013] Optionally, the thickness of the light adjusting layer is 20-40 microns.

[0014] Optionally, the anti-aging layer uses polyethylene as a base material and adds 15% of a light stabilizer and 3% of an antioxidant.

[0015] Optionally, the thickness of the anti-aging layer is 110-150 microns.

[0016] Optionally, the inner layer is attached to the lower surface of the heat insulation layer, and the inner layer is made of polyethylene and polypropylene mixed material.

[0017] Optionally, the thickness of the inner layer is 70-150 μm.

[0018] By the above technical solution, the utility model has at least the following advantages:

[0019] The inner layer is made of polyethylene and polypropylene mixed material, and has outstanding high and low temperature resistance and high softness.

[0020] The heat insulation layer uses a certain proportion of fine silica aerogel particles to replace the opaque heat preservation agent material. The ultra-low thermal conductivity of the aerogel guarantees that the greenhouse film has excellent heat insulation performance, so that the greenhouse has excellent heat preservation performance. Meanwhile, the aerogel itself has light transmission and refraction effect on light, so that the light distribution in the greenhouse is more uniform, and the growth of crops in the greenhouse is more uniform.

[0021] The inorganic rare earth light conversion agent added in the light adjusting layer includes green-to-red GTR-650 II, green-to-red GTR-650 III, violet-to-blue VTB-440, violet-to-red VTR660, red and blue dual light conversion RBI6545, violet-to-far-red VTFR700, and green-to-far-red GTFR708, which are compounded to improve the utilization efficiency of different waveband light.

[0022] The setting of the anti-aging layer guarantees the service life and protection effect of the greenhouse film. The multi-layer composite film has different effects in each layer, and the different materials are combined together to realize complementary advantages, improve the heat preservation effect and light energy utilization rate, and better meet the needs of agricultural production. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 A perspective view of a low-thermal-conductivity agricultural greenhouse film according to an embodiment of the utility model is provided.

[0024] Figure 2 A perspective view of a low-thermal-conductivity agricultural greenhouse film according to an embodiment of the utility model is provided.

[0025] Figure 3 A front view of a low-thermal-conductivity agricultural greenhouse film according to an embodiment of the utility model is provided.

[0026] The reference signs in the drawings of the specification include: inner layer 1, heat insulation layer 2, light adjusting layer 3, and anti-aging layer 4. DETAILED DESCRIPTION

[0027] For further illustrating the technical means and effects taken by the utility model to achieve the predetermined utility model purposes, the following will be explained in detail according to the specific implementation, structure, features and effects of the utility model application in combination with the drawings and preferred embodiments. In the following description, different "an embodiment" or "embodiments" do not necessarily refer to the same embodiment. In addition, the specific features, structures or characteristics in one or more embodiments can be combined in any suitable form.

[0028] The utility model will be further explained in detail in combination with the drawings and embodiments.

[0029] As shown in Figure 1 , Figure 2 and Figure 3 , one embodiment of the utility model provides a low thermal conductivity agricultural shed film, which comprises:

[0030] The heat insulation layer 2, the light adjusting layer 3 and the anti-aging layer 4 are arranged from bottom to top.

[0031] The heat insulation layer 2 is uniformly mixed by a thermoplastic polymer and a silica aerogel powder.

[0032] In the specific implementation, the thermoplastic polymer is a mixture of polyethylene and polyvinyl acetate, and the thickness of the heat insulation layer 2 is 20-40 μm.

[0033] In the specific implementation, the light adjusting layer 3 uses polyethylene as a base material and adds 10% rare earth light conversion agent.

[0034] In the specific implementation, the thickness of the light adjusting layer 3 is 20-40 μm.

[0035] In the specific implementation, the anti-aging layer 4 uses polyethylene as a base material and adds 15% light stabilizer and 3% antioxidant.

[0036] In the specific implementation, the thickness of the anti-aging layer 4 is 110-150 μm.

[0037] In the specific implementation, it further comprises an inner layer 1, which is attached to the lower surface of the heat insulation layer 2, and the inner layer 1 uses a mixed material of polyethylene and polypropylene.

[0038] In the specific implementation, the thickness of the inner layer 1 is 70-150 μm.

[0039] The working principle and beneficial effects of the shed film are as follows:

[0040] The heat insulation layer 2 is arranged to form a heat insulation barrier to block the heat transfer between the two sides of the greenhouse film, and the heat insulation effect is good under the conditions of reducing the temperature in the greenhouse in summer and increasing the temperature in the greenhouse in winter. Meanwhile, the fine titanium dioxide aerogel itself has the effects of transmitting and refracting light, refracts the light in the greenhouse at different angles, and makes the light distribution in the greenhouse more uniform.

[0041] The arrangement of the heat insulation layer 2 greatly reduces the heat transfer between the inside and outside of the greenhouse through the greenhouse film, thereby reducing the heat loss of the greenhouse in the low-temperature environment outside, and the added fine silica aerogel itself has the effect of refracting light, so that the sunlight forms countless refracted light in the greenhouse after passing through the greenhouse film, thereby weakening the shadow formed by the opaque framework material, making the light distribution in the greenhouse more uniform, and making the crops grow consistently and stably. The light adjustment of the light adjustment layer 3 improves the utilization efficiency of light energy, and the addition of the far-red light material is beneficial to the temperature increase in the greenhouse, thereby reducing the use of energy for heating. The arrangement of the anti-aging layer 4 not only improves the service life of the greenhouse film as a whole, but also protects the inside and outside of the greenhouse film, thereby improving the safety of the greenhouse film in the process of agricultural production.

[0042] Through the arrangement of the inner layer 1, the heat insulation layer 2, the light adjustment layer 3 and the anti-aging layer 4, a multi-layer composite greenhouse film is obtained, thereby avoiding the problems of poor protection effect and single function of the single-layer greenhouse film. The inner layer 1 is made of a mixed material of polyethylene and polypropylene, has outstanding high and low temperature resistance and high softness, the heat insulation layer 2 is made of a mixed material of polyethylene and polyvinyl acetate, the light adjustment layer 3 and the anti-aging layer 4 are both made of polyethylene material, and these materials all have good weather resistance and waterproof performance, can effectively protect the greenhouse film from being eroded by external environment such as ultraviolet rays, strong wind and heavy rain. At the same time, the excellent light transmittance of these materials can make the light pass through the greenhouse film to ensure that the crops in the greenhouse are adequately illuminated. In addition, the main materials used in each layer of film have softness and plasticity, can be bent, stretched or deformed according to the needs, and have strong practicality.

[0043] The above merely illustrates the specific implementation of the present application, but the protection scope of the present application is not limited to this. Any skilled person in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A low heat conductive agricultural shelter film, characterized by, Comprise: From bottom to top in turn arranged heat insulation layer, light adjusting layer and anti-aging layer; Wherein, the heat insulation layer is made of thermoplastic polymer and silica aerogel powder.

2. The low thermal conductivity agricultural shed film according to claim 1, wherein, The thermoplastic polymer is a mixture of polyethylene and polyvinyl acetate, and the thickness of the heat insulation layer is 20-40 μm.

3. The low thermal conductivity agricultural shed film according to claim 1, wherein, The light adjusting layer uses polyethylene as the base material and adds 10% rare earth light conversion agent.

4. The low thermal conductivity agricultural shed film according to claim 3, wherein, The thickness of the light adjusting layer is 20-40 μm.

5. The low thermal conductivity agricultural shed film according to claim 1, wherein, The anti-aging layer uses polyethylene as the base material and adds 15% light stabilizer and 3% antioxidant.

6. The low thermal conductivity agricultural shed film according to claim 5, wherein, The thickness of the anti-aging layer is 110-150 μm.

7. The low thermal conductivity agricultural shed film according to claim 1, wherein, Further comprising an inner layer, the inner layer is attached to the lower surface of the heat insulation layer, and the inner layer uses a mixed material of polyethylene and polypropylene.

8. The low thermal conductivity agricultural shed film according to claim 7, wherein, The thickness of the inner layer is 70-150 μm.

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