Full-biodegradable mulching film beneficial to soil moisture conservation

Abstract

The full-biodegradable mulching film comprises a water absorption layer, an anti-overflow layer and a moisture preservation layer which are arranged from top to bottom, in the using process of the full-biodegradable mulching film, moisture permeates into a first-stage moisture preservation layer after penetrating through the anti-overflow layer, pores in the surface of the first-stage moisture preservation layer are larger than pores in the surface of a second-stage moisture preservation layer, and the moisture preservation effect is better. After entering the second-stage moisturizing layer, water is difficult to penetrate through the first-stage moisturizing layer with smaller pores above to flow back and rise, so that sufficient moisture preservation treatment of the first-stage moisturizing layer and the second-stage moisturizing layer on the water is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of biodegradable ground films, in particular to a fully biodegradable ground film which is beneficial to moisture conservation. Background Art

[0002] Film mulching can increase crop yields by approximately 30%. Its advantages are particularly pronounced in the vast, arid regions of northern my country, leading to widespread adoption of the practice. According to statistics, in 2011, my country used 1.255 million tons of film, covering 300 million mu (approximately 666 acres) of cultivated land. In 2013, the country used 1.362 million tons of film, covering over 370 million mu (approximately 666 acres) of cultivated land.

[0003] Biodegradable mulch refers to a type of plastic mulch that can be degraded by microorganisms in natural environments. When microorganisms such as bacteria, fungi, and actinomycetes invade the plastic film, their cell growth causes the polymer components to hydrolyze, ionize, or protonate, leading to mechanical damage and fragmentation into oligomeric fragments. Enzymes secreted by the fungi or bacteria decompose or oxidize the water-soluble polymers into water-soluble fragments, generating new small-molecule compounds until they ultimately decompose into CO2 and H2O.

[0004] Publication No. CN205682045U discloses a fully biodegradable mulch film that is beneficial for soil moisture retention. This film, which belongs to the field of layered products, comprises a film body characterized by being composed of a first degradable layer, a barrier layer, and a second degradable layer connected in sequence. The barrier layer increases the film's air density, reduces its permeability, and prevents water evaporation, thereby increasing soil moisture retention and enhancing soil moisture retention.

[0005] However, the existing technology still has major deficiencies, such as:

[0006] In the above-mentioned device and the prior art, the barrier layer can increase the air density of the membrane, but the barrier layer will affect the water permeability of the membrane. After the upper water-absorbing layer absorbs the water source, the barrier layer will block the water from entering the ground soil, affecting the soil moisture absorption rate. Utility Model Content

[0007] The purpose of the present invention is to provide a fully biodegradable ground film that is beneficial to soil moisture conservation, so as to solve the problems raised in the above-mentioned background technology.

[0008] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a fully biodegradable ground film that is beneficial to moisture conservation, including a water absorption layer, an anti-water overflow layer and a moisturizing layer arranged from top to bottom, the moisturizing layer is a double-layer arrangement, the moisturizing layer includes a primary moisturizing layer and a secondary moisturizing layer, the primary moisturizing layer is arranged at the bottom of the anti-water overflow layer, and the secondary moisturizing layer is arranged at the bottom of the first moisturizing layer, the water absorption layer, the anti-water overflow layer, the primary moisturizing layer and the secondary moisturizing layer are compounded by degradable biomass glue.

[0009] Preferably, the surface pore size of the primary moisturizing layer can be set to 1.2mm-2.0mm.

[0010] Preferably, the surface pore size of the secondary moisturizing layer can be set to 0.5-1.1 mm.

[0011] Preferably, the primary moisturizing layer and the secondary moisturizing layer are configured as starch-based water-retaining agents or natural plant-based water-retaining agents, an anti-tear layer is provided at the bottom of the secondary moisturizing layer, and a biodegradable layer is provided at the bottom of the anti-tear layer.

[0012] Preferably, the thickness of the primary moisturizing layer is set to 6.7-6.9 um.

[0013] Preferably, the thickness of the secondary moisturizing layer is set to 7.2-8um.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] After passing through the anti-overflow layer, moisture penetrates into the primary moisturizing layer. The pores on the surface of the primary moisturizing layer are larger than the pores on the surface of the secondary moisturizing layer. After entering the secondary moisturizing layer, it is difficult for moisture to flow back and rise through the primary moisturizing layer with smaller pores above, ensuring that the primary moisturizing layer and the secondary moisturizing layer areas are fully moisturized. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is an overall schematic diagram of the device of the utility model;

[0017] Figure 2 This is a structural distribution diagram of the device of this utility model.

[0018] In the figure: 1. Water absorption layer; 2. Anti-water overflow layer; 3. Primary moisturizing layer; 4. Secondary moisturizing layer; 5. Tear-resistant layer; 6. Biodegradable layer. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0020] See also Figure 1-2 , the utility model provides a technical solution:

[0021] Example 1: A fully biodegradable ground film that is beneficial to moisture conservation: it includes a water absorption layer 1, an anti-water overflow layer 2 and a moisturizing layer arranged from top to bottom, the moisturizing layer is a double-layer arrangement, and the moisturizing layer includes a primary moisturizing layer 3 and a secondary moisturizing layer 4, the primary moisturizing layer 3 is arranged at the bottom of the anti-water overflow layer 2, and the secondary moisturizing layer 4 is arranged at the bottom of the primary moisturizing layer 3, and the water absorption layer 1, the anti-water overflow layer 2, the primary moisturizing layer 3 and the secondary moisturizing layer 4 are compounded by degradable biomass glue.

[0022] The surface pore size of the first-level moisturizing layer 3 can be set to 1.2mm-2.0mm.

[0023] The surface pore size of the secondary moisturizing layer 4 can be set to 0.5-1.1 mm.

[0024] The primary moisturizing layer 3 and the secondary moisturizing layer 4 are set as starch-based water-retaining agents or natural plant-based water-retaining agents. The bottom of the secondary moisturizing layer 4 is provided with an anti-tear layer 5, and the bottom of the anti-tear layer 5 is provided with a biodegradable layer 6.

[0025] The thickness of the first-level moisturizing layer 3 is set to 6.7-6.9um.

[0026] The thickness of the secondary moisturizing layer 4 is set to 7.2-8um.

[0027] An anti-overflow layer 2 is arranged at the bottom of the water-absorbing layer 1. The anti-overflow layer 2 is a liquid one-way permeable membrane. After water passes through the anti-overflow layer 2, it cannot flow back through the anti-overflow layer 2, thereby reducing the water loss problem of the biofilm and increasing the soil moisture content.

[0028] Working Principle: When using this device, the operator lays the bottom of the ground film directly on the surface of the ground soil pile, and the biodegradable layer 6 is attached to the surface of the soil pile. The water-absorbing layer 1 absorbs moisture from irrigation and rainwater, and the moisture penetrates downward through the water-absorbing layer 1. The bottom of the water-absorbing layer 1 is separated by an anti-overflow layer 2. The anti-overflow layer 2 is a liquid one-way permeable membrane. After the water passes through the anti-overflow layer 2, it cannot flow back through the anti-overflow layer 2, thereby reducing the water loss problem of the biofilm and improving the soil moisture content.

[0029] After passing through the anti-overflow layer 2, the water penetrates into the primary moisturizing layer 3. The pores on the surface of the primary moisturizing layer 3 are larger than the pores on the surface of the secondary moisturizing layer 4. After entering the secondary moisturizing layer 4, it is difficult for the water to flow back and rise through the primary moisturizing layer 3 with smaller pores above, ensuring that the primary moisturizing layer 3 and the secondary moisturizing layer 4 areas are fully moisturized.

[0030] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A fully biodegradable mulch film that is beneficial to soil moisture conservation, characterized by: The invention comprises a water absorption layer (1), a water overflow prevention layer (2) and a moisturizing layer arranged from top to bottom, wherein the moisturizing layer is a double-layer arrangement, and comprises a primary moisturizing layer (3) and a secondary moisturizing layer (4), wherein the primary moisturizing layer (3) is arranged at the bottom of the water overflow prevention layer (2), and the secondary moisturizing layer (4) is arranged at the bottom of the primary moisturizing layer (3), and the water absorption layer (1), the water overflow prevention layer (2), the primary moisturizing layer (3) and the secondary moisturizing layer (4) are composited by degradable biomass glue.

2. The fully biodegradable mulch film beneficial for soil moisture conservation according to claim 1, characterized in that: The surface pore size of the primary moisturizing layer (3) can be set to 1.2 mm-2.0 mm.

3. The fully biodegradable mulch film beneficial for soil moisture conservation according to claim 1, characterized in that: The surface pore size of the secondary moisturizing layer (4) can be set to 0.5-1.1 mm.

4. The fully biodegradable mulch film beneficial for soil moisture conservation according to claim 1, characterized in that: The primary moisturizing layer (3) and the secondary moisturizing layer (4) are configured as starch-based water-retaining agents or natural plant-based water-retaining agents; an anti-tear layer (5) is provided at the bottom of the secondary moisturizing layer (4); and a biodegradable layer (6) is provided at the bottom of the anti-tear layer (5).

5. The fully biodegradable mulch film beneficial for soil moisture conservation according to claim 1, characterized in that: The thickness of the primary moisturizing layer (3) is set to 6.7-6.9 μm.

6. The fully biodegradable mulch film beneficial for soil moisture conservation according to claim 1, characterized in that: The thickness of the secondary moisturizing layer (4) is set to 7.2-8 μm.

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