High-strength PE (polyethylene) mulching film with water-saving and heat-insulating properties and preparation process thereof

Abstract

The invention belongs to the technical field of PE mulching films and preparation, and discloses a high-strength PE mulching film with water-saving and heat-preservation performance and a preparation technology thereof.The high-strength PE mulching film comprises a PE mulching film body, and the PE mulching film body is sequentially provided with an upper layer, a middle layer and a lower layer from top to bottom; the PE nucleating agent layer is arranged on the upper surface of the upper layer; and the infrared absorption layer is arranged on the lower surface of the lower layer. The PE nucleating agent layer and the infrared absorption layer are arranged on the upper surface and the lower surface of the PE mulching film body respectively, the PE nucleating agent layer can increase the light transmittance of visible light, sunlight can effectively penetrate through the PE mulching film to reach the ground surface, and the temperature needed by growth of crops is provided; and meanwhile, the infrared absorption layer can absorb infrared heat radiation lost by the earth surface at night, heat loss is prevented, and therefore the good heat preservation effect is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of PE ground film and preparation thereof, in particular to a high-strength PE ground film with water-saving and heat-insulating properties and a preparation process thereof. Background Art

[0002] PE mulch has the characteristics of low thickness (10-30um), high yield, low cost, and good heat preservation and moisture retention. It can not only increase ground temperature, retain water, soil, and fertilizer, but also has many functions such as weed control, pest control, drought and waterlogging prevention, salt suppression and seedling protection, and improvement of near-ground light and heat conditions, making the product hygienic and clean. For those newly unearthed seedlings, it has the functions of root protection and growth promotion. However, the light transmittance of ordinary PE mulch is poor, especially in the autumn and winter in the north when the mulch is used as a crop protection shed. The sunshine time is short, and the sunlight that reaches the surface of the ground where crops are planted through the PE mulch is small, and the heat preservation effect on crops is poor. On the other hand, in the north in autumn and winter, due to the large temperature difference between day and night, the temperature at night suddenly becomes low due to radiation cooling, and the heat absorbed by the surface from sunlight during the day will quickly dissipate in the form of infrared heat radiation at night.

[0003] Therefore, there is an urgent need to provide a new type of PE mulch film, which has good warming and moisture retention effects and can meet the temperature required for crop growth in autumn and winter. At the same time, it has high strength and can resist stretching and tearing in the natural environment, thereby solving the above problems. Summary of the invention

[0004] The purpose of the present invention is to provide a high-strength PE ground film with water-saving and heat-insulating properties and a preparation process thereof, aiming to solve the problems of poor light transmittance, poor heat-insulating effect and insufficient strength of ordinary PE ground films.

[0005] In order to achieve the above-mentioned object, the present invention provides the following technical solution: a high-strength PE ground film with water-saving and heat-insulating properties, comprising a PE ground film body, an upper layer, a middle layer and a lower layer arranged in sequence from top to bottom on the PE ground film body, a PE nucleating agent layer arranged on the upper surface of the upper layer and an infrared absorption layer arranged on the lower surface of the lower layer; The PE ground film body is prepared from the following raw materials in proportion by weight: 30-50 parts of low-density polyethylene, 40-70 parts of linear low-density polyethylene, 20-45 parts of metallocene linear low-density polyethylene, 0.1-0.3 parts of inorganic opening agent, 0.5-2 parts of high molecular weight light stabilizer and 0.2-0.8 parts of light shielding agent.

[0006] Preferably, the high molecular weight light stabilizer is one or more of styrene-piperidinyl acrylate copolymer, p-hydroxystyrene-piperidinyl acrylate copolymer or p-dimethylaminostyrene-piperidinyl acrylate copolymer.

[0007] Preferably, the light shielding agent is nano titanium dioxide or nano zinc oxide.

[0008] Preferably, the method comprises the following steps: a) mixing the raw materials of the PE mulch body according to a ratio, adding the raw materials to an extruder, and performing extrusion granulation to obtain pellets of the PE mulch body; b) coating the PE nucleating agent layer raw material on the upper surface of the upper layer of the PE ground film body to form a PE nucleating agent layer; c) coating the infrared absorption layer raw material on the lower surface of the lower layer of the PE ground film body to form an infrared absorption layer; d) The coated PE ground film body is melt-extruded through a three-layer co-extrusion film blowing machine, and then subjected to blowing, traction, cooling, corona treatment, and film winding to obtain a high-strength PE ground film with water-saving and heat-insulating properties.

[0009] Preferably, the raw material ratio of the PE ground film body is: 40 parts of low-density polyethylene, 50 parts of linear low-density polyethylene, 30 parts of metallocene linear low-density polyethylene, 0.2 parts of inorganic opening agent, 1 part of high molecular weight light stabilizer and 0.5 parts of light shielding agent.

[0010] Preferably, the raw material ratio of the PE ground film body is: 35 parts of low-density polyethylene, 60 parts of linear low-density polyethylene, 25 parts of metallocene linear low-density polyethylene, 0.1 parts of inorganic opening agent, 0.8 parts of high molecular weight light stabilizer and 0.6 parts of light shielding agent.

[0011] Preferably, the high molecular weight light stabilizer is one or more of styrene-piperidinyl acrylate copolymer, p-hydroxystyrene-piperidinyl acrylate copolymer or p-dimethylaminostyrene-piperidinyl acrylate copolymer; the light shielding agent is nano titanium dioxide or nano zinc oxide.

[0012] Preferably, in step a), the temperature of the extruder is 180°C to 250°C to ensure that the raw materials are fully melted and mixed uniformly.

[0013] Preferably, in step b) and step c), the PE nucleating agent layer and the infrared absorbing layer are uniformly coated on the corresponding surfaces of the PE ground film body by coating or spraying, and the coating thickness is 0.01 mm to 0.1 mm to ensure good light transmittance and thermal insulation effect.

[0014] Preferably, in step d), the melt temperature of the three-layer co-extrusion film blowing machine is 200°C to 280°C, the blowing ratio is 1.5:1 to 3:1, the traction speed is 10m / min to 50m / min, and the cooling method is air cooling or water cooling to ensure that the PE mulch film has good physical properties and appearance quality.

[0015] The beneficial effects of the present invention are as follows: 1. The present invention respectively arranges a PE nucleating agent layer and an infrared absorption layer on the upper and lower surfaces of the PE ground film body. The PE nucleating agent layer can increase the transmittance of visible light, so that sunlight can effectively penetrate the PE ground film to reach the ground surface, providing the temperature required for the growth of crops; at the same time, the infrared absorption layer can absorb the infrared heat radiation dissipated from the ground surface at night, prevent heat loss, and thus achieve a better thermal insulation effect.

[0016] 2. The present invention can maintain a good thermal insulation effect of the PE mulch while taking into account the tensile and toughness properties through the three-layer arrangement of the PE mulch body, and can slow down the diffusion of heat absorbed by the infrared absorption layer to the PE nucleating agent layer and even outside the PE mulch due to the large temperature difference between the inside and outside of the PE mulch at night.

[0017] 3. High molecular weight light stabilizer and light shielding agent are added to the PE mulch film of the present invention, which improves the aging resistance and heat resistance of the PE mulch film. When printed with water-based ink, the drying rate is fast and there will be no anti-sticking phenomenon after false drying.

[0018] 4. The PE mulch film of the present invention has a reasonable raw material ratio, a simple process, is suitable for large-scale industrial production, and has good economic and social benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The figure is a simplified diagram of the preparation process of the high-strength PE ground film of the present invention. DETAILED DESCRIPTION

[0020] 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 described embodiments 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 creative work are within the scope of protection of the present invention.

[0021] like Figure 1 As shown, an embodiment of the present invention provides a high-strength PE ground film with water-saving and heat-insulating properties, including a PE ground film body, an upper layer, a middle layer and a lower layer arranged in sequence from top to bottom on the PE ground film body, a PE nucleating agent layer arranged on the upper surface of the upper layer and an infrared absorption layer arranged on the lower surface of the lower layer; The PE ground film body is prepared from the following raw materials in proportion by weight: 30-50 parts of low-density polyethylene, 40-70 parts of linear low-density polyethylene, 20-45 parts of metallocene linear low-density polyethylene, 0.1-0.3 parts of inorganic opening agent, 0.5-2 parts of high molecular weight light stabilizer and 0.2-0.8 parts of light shielding agent.

[0022] The high molecular weight light stabilizer is one or more of styrene-piperidinyl acrylate copolymer, p-hydroxystyrene-piperidinyl acrylate copolymer or p-dimethylaminostyrene-piperidinyl acrylate copolymer.

[0023] Wherein, the light shielding agent is nano titanium dioxide or nano zinc oxide.

[0024] The steps include: a) mixing the raw materials of the PE mulch body according to a ratio, adding the raw materials to an extruder, and performing extrusion granulation to obtain pellets of the PE mulch body; b) coating the PE nucleating agent layer raw material on the upper surface of the upper layer of the PE ground film body to form a PE nucleating agent layer; c) coating the infrared absorption layer raw material on the lower surface of the lower layer of the PE ground film body to form an infrared absorption layer; d) The coated PE ground film body is melt-extruded through a three-layer co-extrusion film blowing machine, and then subjected to blowing, traction, cooling, corona treatment, and film winding to obtain a high-strength PE ground film with water-saving and heat-insulating properties.

[0025] Among them, the raw material ratio of the PE mulch body is: 40 parts of low-density polyethylene, 50 parts of linear low-density polyethylene, 30 parts of metallocene linear low-density polyethylene, 0.2 parts of inorganic opening agent, 1 part of high molecular weight light stabilizer and 0.5 parts of light shielding agent.

[0026] Among them, the raw material ratio of the PE mulch body is: 35 parts of low-density polyethylene, 60 parts of linear low-density polyethylene, 25 parts of metallocene linear low-density polyethylene, 0.1 parts of inorganic opening agent, 0.8 parts of high molecular weight light stabilizer and 0.6 parts of light shielding agent.

[0027] The high molecular weight light stabilizer is one or more of styrene-piperidinyl acrylate copolymer, p-hydroxystyrene-piperidinyl acrylate copolymer or p-dimethylaminostyrene-piperidinyl acrylate copolymer; and the light shielding agent is nano titanium dioxide or nano zinc oxide.

[0028] Wherein, in step a), the temperature of the extruder is 180°C to 250°C to ensure that the raw materials are fully melted and mixed evenly.

[0029] Wherein, in step b) and step c), the PE nucleating agent layer and the infrared absorbing layer are uniformly coated on the corresponding surfaces of the PE ground film body by coating or spraying, and the coating thickness is 0.01mm to 0.1mm to ensure good light transmittance and thermal insulation effect.

[0030] Wherein, in step d), the melt temperature of the three-layer co-extrusion film blowing machine is 200°C to 280°C, the blowing ratio is 1.5:1 to 3:1, the traction speed is 10m / min to 50m / min, and the cooling method is air cooling or water cooling to ensure that the PE mulch film has good physical properties and appearance quality.

[0031] Example 1 40 parts of low-density polyethylene, 50 parts of linear low-density polyethylene, 30 parts of metallocene linear low-density polyethylene, 0.2 parts of inorganic opening agent, 1 part of high molecular weight light stabilizer (p-hydroxystyrene-piperidinyl acrylate copolymer) and 0.5 parts of light shielding agent (nano titanium dioxide) are mixed evenly, added to the extruder, and extruded and granulated to obtain PE mulch film pellets.

[0032] The PE nucleating agent layer raw material is coated on the upper surface of the upper layer of the PE ground film body to form a PE nucleating agent layer.

[0033] The infrared absorption layer raw material is coated on the lower surface of the lower layer of the PE ground film body to form an infrared absorption layer.

[0034] The coated PE ground film body is melt-extruded through a three-layer co-extrusion film blowing machine, and is subjected to inflation, traction, cooling, corona treatment, and film winding to obtain a high-strength PE ground film with water-saving and heat-insulating properties.

[0035] Example 2 35 parts of low-density polyethylene, 60 parts of linear low-density polyethylene, 25 parts of metallocene linear low-density polyethylene, 0.1 parts of inorganic opening agent, 0.8 parts of high molecular weight light stabilizer (dimethylaminostyrene-piperidinyl acrylate copolymer) and 0.6 parts of light shielding agent (nano zinc oxide) are mixed evenly, added to the extruder, and extruded and granulated to obtain pellets of the PE mulch film body.

[0036] The PE nucleating agent layer raw material is coated on the upper surface of the upper layer of the PE ground film body to form a PE nucleating agent layer.

[0037] The infrared absorption layer material is coated on the lower surface of the lower layer of the PE ground film body to form an infrared absorption layer.

[0038] The coated PE ground film body is melt-extruded through a three-layer co-extrusion film blowing machine, and is subjected to inflation, traction, cooling, corona treatment, and film winding to obtain a high-strength PE ground film with water-saving and heat-insulating properties.

[0039] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0040] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. High-strength PE ground film with water-saving and heat-insulating properties, characterized by: The PE ground film body comprises an upper layer, a middle layer and a lower layer arranged in sequence from top to bottom, a PE nucleating agent layer arranged on the upper surface of the upper layer and an infrared absorption layer arranged on the lower surface of the lower layer; The PE ground film body is prepared from the following raw materials in proportion by weight: 30-50 parts of low-density polyethylene, 40-70 parts of linear low-density polyethylene, 20-45 parts of metallocene linear low-density polyethylene, 0.1-0.3 parts of inorganic opening agent, 0.5-2 parts of high molecular weight light stabilizer and 0.2-0.8 parts of light shielding agent.

2. The high-strength PE ground film with water-saving and heat-insulating properties according to claim 1 is characterized in that: The high molecular weight light stabilizer is one or more of styrene-piperidinyl acrylate copolymer, p-hydroxystyrene-piperidinyl acrylate copolymer or p-dimethylaminostyrene-piperidinyl acrylate copolymer.

3. The high-strength PE ground film with water-saving and heat-insulating properties according to claim 1 is characterized in that: The light shielding agent is nano titanium dioxide or nano zinc oxide.

4. The preparation process of the high-strength PE ground film with water-saving and heat-insulating properties according to claims 1-3 is characterized in that: The following steps are involved: a) mixing the raw materials of the PE mulch body according to a ratio, adding the raw materials to an extruder, and performing extrusion granulation to obtain pellets of the PE mulch body; b) coating the PE nucleating agent layer raw material on the upper surface of the upper layer of the PE ground film body to form a PE nucleating agent layer; c) coating the infrared absorption layer raw material on the lower surface of the lower layer of the PE ground film body to form an infrared absorption layer; d) The coated PE ground film body is melt-extruded through a three-layer co-extrusion film blowing machine, and then subjected to blowing, traction, cooling, corona treatment, and film winding to obtain a high-strength PE ground film with water-saving and heat-insulating properties.

5. The preparation process of the high-strength PE ground film with water-saving and heat-insulating properties according to claim 4 is characterized in that: The raw material ratio of the PE ground film body is: 40 parts of low-density polyethylene, 50 parts of linear low-density polyethylene, 30 parts of metallocene linear low-density polyethylene, 0.2 parts of inorganic opening agent, 1 part of high molecular weight light stabilizer and 0.5 parts of light shielding agent.

6. The preparation process of the high-strength PE ground film with water-saving and heat-insulating properties according to claim 4 is characterized in that: The raw material ratio of the PE ground film body is: 35 parts of low-density polyethylene, 60 parts of linear low-density polyethylene, 25 parts of metallocene linear low-density polyethylene, 0.1 parts of inorganic opening agent, 0.8 parts of high molecular weight light stabilizer and 0.6 parts of light shielding agent.

7. The process for preparing the high-strength PE ground film with water-saving and heat-insulating properties according to claim 5, characterized in that: The high molecular weight light stabilizer is one or more of styrene-piperidinyl acrylate copolymer, p-hydroxystyrene-piperidinyl acrylate copolymer or p-dimethylaminostyrene-piperidinyl acrylate copolymer; the light shielding agent is nano titanium dioxide or nano zinc oxide.

8. The process for preparing the high-strength PE ground film with water-saving and heat-insulating properties according to claim 4, characterized in that: In step a), the temperature of the extruder is 180°C to 250°C to ensure that the raw materials are fully melted and mixed uniformly.

9. The process for preparing the high-strength PE ground film with water-saving and heat-insulating properties according to claim 4, characterized in that: In step b) and step c), the PE nucleating agent layer and the infrared absorbing layer are uniformly coated on the corresponding surfaces of the PE ground film body by coating or spraying, and the coating thickness is 0.01mm to 0.1mm to ensure good light transmittance and thermal insulation effect.

10. The process for preparing the high-strength PE ground film with water-saving and heat-insulating properties according to claim 4, characterized in that: In step d), the melt temperature of the three-layer co-extrusion film blowing machine is 200°C to 280°C, the blowing ratio is 1.5:1 to 3:1, the traction speed is 10m / min to 50m / min, and the cooling method is air cooling or water cooling to ensure that the PE mulch film has good physical properties and appearance quality.

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