Preparation method and application of environment-friendly full-biodegradable mulching film

Abstract

The invention belongs to the technical field of agriculture, and discloses a preparation method and application of an environment-friendly full-biodegradable mulching film, and the preparation method of the environment-friendly full-biodegradable mulching film comprises the following steps: S1, preparing raw materials; s2, mixing the raw materials; s3, adding an auxiliary material; step S4, mixing and plasticizing; s5, extruding to form a film; step S6, cooling and traction; and S7, rolling and packaging are conducted. The full-biodegradable mulching film prepared by the invention has good mechanical properties and heat-preserving and moisture-preserving effects, can be quickly degraded in a natural environment, and does not cause negative effects on the environment; meanwhile, the raw materials of the mulching film are from renewable resources, so that waste recycling is realized, and the requirement of sustainable development is met.

Description

Technical Field

[0001] The invention belongs to the technical field of agriculture, and specifically relates to a method for preparing an environmentally friendly fully biodegradable mulch film and an application thereof. Background Art

[0002] Traditional mulch films are mainly made of non-degradable materials such as polyethylene, which are difficult to decompose after use, causing long-term pollution to the soil and ecological environment. With the increasing pressure on global resources and the environment, the use of ecologically compliant and biodegradable materials has become a general trend. Therefore, it is of great significance to develop a fully biodegradable mulch film. Summary of the invention

[0003] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides an environmentally friendly fully biodegradable mulch film preparation method and application thereof, which effectively solves the problems raised by the background technology.

[0004] To achieve the above object, the present invention provides the following technical solution: a method for preparing an environmentally friendly fully biodegradable mulch film, comprising the following steps:

[0005] Step S1, raw material preparation: prepare, by weight, 30-40 parts of corn starch, 15-20 parts of polylactic acid, 30-40 parts of polyhydroxyalkanoate, 15-20 parts of chitosan, 10-20 parts of glycerol, and 15-20 parts of humus concentrate;

[0006] Step S2, mixing raw materials: putting corn starch, polylactic acid and polyhydroxyalkanoate into a blender and stirring evenly;

[0007] Step S3, adding auxiliary materials: adding chitosan, glycerol, and humus concentrate auxiliary materials to the mixed raw materials, and continuing stirring for 10-20 minutes at a stirring speed of 300-400 r / min;

[0008] Step S4, mixing and plasticizing: putting the mixed raw materials into a mixing and plasticizing machine for mixing and plasticizing;

[0009] Step S5, extrusion film formation: extruding the mixed and plasticized raw materials into a film through an extruder;

[0010] Step S6, cooling and pulling: cooling the extruded film by a cooling device, and then pulling the film to a winder by a pulling device;

[0011] Step S7, winding and packaging: the cooled film is wound up and packaged. The winding speed must match the traction speed. The packaging material has moisture-proof properties.

[0012] Preferably, in step S2, the stirring time of the raw material mixing is 20-30 min, and the stirring speed is 300-500 r / min.

[0013] Preferably, in step S4, the mixing and plasticizing temperature is 180-220° C., and the mixing time is 10-20 min.

[0014] Preferably, in step S5, the extruder temperature is 190-230° C., the extrusion speed is 20-50 m / min, and the film thickness is 0.01-0.05 mm.

[0015] Preferably, in step S6, the pulling speed is 20-50 m / min.

[0016] The invention discloses an environmentally friendly fully biodegradable mulch film preparation method for covering the soil surface during crop planting, which has the effects of increasing soil temperature, limiting water evaporation, maintaining soil moisture, inhibiting weed growth, inhibiting mineral element leaching, avoiding damage to soil capillary structure by residual film fragments, and inhibiting soil compaction.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The fully biodegradable mulch film prepared by the present invention has good mechanical properties and heat preservation and moisture retention effects, and can be rapidly degraded in the natural environment without causing negative impacts on the environment; at the same time, the raw materials of the mulch film are derived from renewable resources, thus achieving waste recycling and meeting the requirements of sustainable development. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0020] In the attached picture:

[0021] Figure 1 The present invention is a schematic diagram of a process for preparing an environmentally friendly fully biodegradable mulch film. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0023] Depend on Figure 1 The present invention relates to a method for preparing an environmentally friendly fully biodegradable mulch film, comprising the following steps:

[0024] Step S1, raw material preparation: prepare, by weight, 30-40 parts of corn starch, 15-20 parts of polylactic acid, 30-40 parts of polyhydroxyalkanoate, 15-20 parts of chitosan, 10-20 parts of glycerol, and 15-20 parts of humus concentrate;

[0025] Step S2, mixing raw materials: putting corn starch, polylactic acid and polyhydroxyalkanoate into a blender and stirring evenly;

[0026] Step S3, adding auxiliary materials: adding chitosan, glycerol, and humus concentrate auxiliary materials to the mixed raw materials, and continuing stirring for 10-20 minutes at a stirring speed of 300-400 r / min;

[0027] Step S4, mixing and plasticizing: putting the mixed raw materials into a mixing and plasticizing machine for mixing and plasticizing;

[0028] Step S5, extrusion film formation: extruding the mixed and plasticized raw materials into a film through an extruder;

[0029] Step S6, cooling and pulling: cooling the extruded film by a cooling device, and then pulling the film to a winder by a pulling device;

[0030] Step S7, winding and packaging: the cooled film is wound up and packaged. The winding speed must match the traction speed. The packaging material has moisture-proof properties.

[0031] In step S2, the stirring time of the raw material mixing is 20-30 minutes, and the stirring speed is 300-500 r / min.

[0032] In step S4, the mixing and plasticizing temperature is 180-220° C., and the mixing time is 10-20 min.

[0033] In step S5, the extruder temperature is 190-230° C., the extrusion speed is 20-50 m / min, and the film thickness is 0.01-0.05 mm.

[0034] In step S6, the pulling speed is 20-50 m / min.

[0035] The invention discloses an environmentally friendly fully biodegradable mulch film preparation method for covering the soil surface during crop planting, which has the effects of increasing soil temperature, limiting water evaporation, maintaining soil moisture, inhibiting weed growth, inhibiting mineral element leaching, avoiding damage to soil capillary structure by residual film fragments, and inhibiting soil compaction.

[0036] Embodiment 1:

[0037] The present invention relates to a method for preparing an environmentally friendly fully biodegradable mulch film, comprising the following steps:

[0038] Step S1, raw material preparation: by weight, prepare 30 parts of corn starch, 15 parts of polylactic acid, 30 parts of polyhydroxyalkanoate, 15 parts of chitosan, 10 parts of glycerol, and 15 parts of humus concentrate;

[0039] Step S2, mixing raw materials: putting corn starch, polylactic acid and polyhydroxyalkanoate into a blender and stirring evenly;

[0040] Step S3, adding auxiliary materials: adding chitosan, glycerol, and humus concentrate auxiliary materials to the mixed raw materials, and continuing stirring for 10 minutes at a stirring speed of 300 r / min;

[0041] Step S4, mixing and plasticizing: putting the mixed raw materials into a mixing and plasticizing machine for mixing and plasticizing;

[0042] Step S5, extrusion film formation: extruding the mixed and plasticized raw materials into a film through an extruder;

[0043] Step S6, cooling and pulling: cooling the extruded film by a cooling device, and then pulling the film to a winder by a pulling device;

[0044] Step S7, winding and packaging: the cooled film is wound up and packaged. The winding speed must match the traction speed. The packaging material has moisture-proof properties.

[0045] In step S2, the stirring time of the raw material mixing is 20 minutes, and the stirring speed is 300 r / min.

[0046] In step S4, the mixing and plasticizing temperature is 180° C. and the mixing time is 10 min.

[0047] In step S5, the extruder temperature is 190°C, the extrusion speed is 20m / min, and the film thickness is 0.02mm.

[0048] In step S6, the pulling speed is 20 m / min.

[0049] A method for preparing an environmentally friendly fully biodegradable mulch film is used for covering the soil surface during crop planting, and has the effects of increasing soil temperature, limiting water evaporation, maintaining soil moisture, inhibiting weed growth, inhibiting mineral element leaching, avoiding damage to soil capillary structure by residual film fragments, and inhibiting soil compaction.

[0050] Embodiment 2:

[0051] The present invention relates to a method for preparing an environmentally friendly fully biodegradable mulch film, comprising the following steps:

[0052] Step S1, raw material preparation: by weight, prepare 40 parts of corn starch, 20 parts of polylactic acid, 40 parts of polyhydroxyalkanoate, 20 parts of chitosan, 20 parts of glycerol, and 20 parts of humus concentrate;

[0053] Step S2, mixing raw materials: putting corn starch, polylactic acid and polyhydroxyalkanoate into a blender and stirring evenly;

[0054] Step S3, adding auxiliary materials: adding chitosan, glycerol, and humus concentrate auxiliary materials to the mixed raw materials, and continuing stirring for 20 minutes at a stirring speed of 400 r / min;

[0055] Step S4, mixing and plasticizing: putting the mixed raw materials into a mixing and plasticizing machine for mixing and plasticizing;

[0056] Step S5, extrusion film formation: extruding the mixed and plasticized raw materials into a film through an extruder;

[0057] Step S6, cooling and pulling: cooling the extruded film by a cooling device, and then pulling the film to a winder by a pulling device;

[0058] Step S7, winding and packaging: the cooled film is wound up and packaged. The winding speed must match the traction speed. The packaging material has moisture-proof properties.

[0059] In step S2, the stirring time of the raw material mixing is 30 minutes, and the stirring speed is 500 r / min.

[0060] In step S4, the mixing and plasticizing temperature is 220° C., and the mixing time is 20 min.

[0061] In step S5, the extruder temperature is 230°C, the extrusion speed is 50 m / min, and the film thickness is 0.05 mm.

[0062] In step S6, the pulling speed is 50 m / min.

[0063] A method for preparing an environmentally friendly fully biodegradable mulch film is used for covering the soil surface during crop planting, and has the effects of increasing soil temperature, limiting water evaporation, maintaining soil moisture, inhibiting weed growth, inhibiting mineral element leaching, avoiding damage to soil capillary structure by residual film fragments, and inhibiting soil compaction.

[0064] Embodiment 3:

[0065] The present invention relates to a method for preparing an environmentally friendly fully biodegradable mulch film, comprising the following steps:

[0066] Step S1, raw material preparation: by weight, prepare 35 parts of corn starch, 18 parts of polylactic acid, 35 parts of polyhydroxyalkanoate, 18 parts of chitosan, 15 parts of glycerol, and 17 parts of humus concentrate;

[0067] Step S2, mixing raw materials: putting corn starch, polylactic acid and polyhydroxyalkanoate into a blender and stirring evenly;

[0068] Step S3, adding auxiliary materials: adding chitosan, glycerol, and humus concentrate auxiliary materials to the mixed raw materials, and continuing stirring for 15 minutes at a stirring speed of 350 r / min;

[0069] Step S4, mixing and plasticizing: putting the mixed raw materials into a mixing and plasticizing machine for mixing and plasticizing;

[0070] Step S5, extrusion film formation: extruding the mixed and plasticized raw materials into a film through an extruder;

[0071] Step S6, cooling and pulling: cooling the extruded film by a cooling device, and then pulling the film to a winder by a pulling device;

[0072] Step S7, winding and packaging: the cooled film is wound up and packaged. The winding speed must match the traction speed. The packaging material has moisture-proof properties.

[0073] In step S2, the stirring time of the raw material mixing is 25 minutes, and the stirring speed is 400 r / min.

[0074] In step S4, the mixing and plasticizing temperature is 200° C. and the mixing time is 15 min.

[0075] In step S5, the extruder temperature is 210°C, the extrusion speed is 35m / min, and the film thickness is 0.03mm.

[0076] In step S6, the pulling speed is 35 m / min.

[0077] A method for preparing an environmentally friendly fully biodegradable mulch film is used for covering the soil surface during crop planting, and has the effects of increasing soil temperature, limiting water evaporation, maintaining soil moisture, inhibiting weed growth, inhibiting mineral element leaching, avoiding damage to soil capillary structure by residual film fragments, and inhibiting soil compaction.

[0078] Embodiment 4:

[0079] The present invention relates to a method for preparing an environmentally friendly fully biodegradable mulch film, comprising the following steps:

[0080] Step S1, raw material preparation: by weight, prepare 37 parts of corn starch, 19 parts of polylactic acid, 37 parts of polyhydroxyalkanoate, 19 parts of chitosan, 17 parts of glycerol, and 18 parts of humus concentrate;

[0081] Step S2, mixing raw materials: putting corn starch, polylactic acid and polyhydroxyalkanoate into a blender and stirring evenly;

[0082] Step S3, adding auxiliary materials: adding chitosan, glycerol, and humus concentrate auxiliary materials to the mixed raw materials, and continuing stirring for 17 minutes at a stirring speed of 380 r / min;

[0083] Step S4, mixing and plasticizing: putting the mixed raw materials into a mixing and plasticizing machine for mixing and plasticizing;

[0084] Step S5, extrusion film formation: extruding the mixed and plasticized raw materials into a film through an extruder;

[0085] Step S6, cooling and pulling: cooling the extruded film by a cooling device, and then pulling the film to a winder by a pulling device;

[0086] Step S7, winding and packaging: the cooled film is wound up and packaged. The winding speed must match the traction speed. The packaging material has moisture-proof properties.

[0087] In step S2, the stirring time of the raw material mixing is 27 minutes, and the stirring speed is 450 r / min.

[0088] In step S4, the mixing and plasticizing temperature is 210° C. and the mixing time is 16 min.

[0089] In step S5, the extruder temperature is 220°C, the extrusion speed is 40m / min, and the film thickness is 0.04mm.

[0090] In step S6, the pulling speed is 40 m / min.

[0091] A method for preparing an environmentally friendly fully biodegradable mulch film is used for covering the soil surface during crop planting, which has the effects of increasing soil temperature, limiting water evaporation, maintaining soil moisture, inhibiting weed growth, inhibiting mineral element leaching, avoiding the damage of residual film fragments to the soil capillary structure, and inhibiting soil compaction.

[0092]

[0093]

[0094] 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.

[0095] 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. A method for preparing an environmentally friendly fully biodegradable mulch film, characterized in that: The following steps are involved: Step S1, raw material preparation: prepare, by weight, 30-40 parts of corn starch, 15-20 parts of polylactic acid, 30-40 parts of polyhydroxyalkanoate, 15-20 parts of chitosan, 10-20 parts of glycerol, and 15-20 parts of humus concentrate; Step S2, mixing raw materials: putting corn starch, polylactic acid and polyhydroxyalkanoate into a blender and stirring evenly; Step S3, adding auxiliary materials: adding chitosan, glycerol, and humus concentrate auxiliary materials to the mixed raw materials, and continuing stirring for 10-20 minutes at a stirring speed of 300-400 r / min; Step S4, mixing and plasticizing: putting the mixed raw materials into a mixing and plasticizing machine for mixing and plasticizing; Step S5, extrusion film formation: extruding the mixed and plasticized raw materials into a film through an extruder; Step S6, cooling and pulling: cooling the extruded film by a cooling device, and then pulling the film to a winder by a pulling device; Step S7, winding and packaging: the cooled film is wound up and packaged. The winding speed must match the traction speed. The packaging material has moisture-proof properties.

2. The method for preparing an environmentally friendly fully biodegradable mulch film according to claim 1, characterized in that: In step S2, the stirring time of the raw material mixing is 20-30 minutes, and the stirring speed is 300-500 r / min.

3. The method for preparing an environmentally friendly fully biodegradable mulch film according to claim 2, characterized in that: In the step S4, the mixing and plasticizing temperature is 180-220° C., and the mixing time is 10-20 min.

4. The method for preparing an environmentally friendly fully biodegradable mulch film according to claim 1, characterized in that: In step S5, the extruder temperature is 190-230° C., the extrusion speed is 20-50 m / min, and the film thickness is 0.01-0.05 mm.

5. The method for preparing an environmentally friendly fully biodegradable mulch film according to claim 1, characterized in that: In step S6, the pulling speed is 20-50 m / min.

6. A method for preparing an environmentally friendly fully biodegradable mulch film according to any one of claims 1 to 5, which is used for covering the soil surface during crop planting, and has the effects of increasing soil temperature, limiting water evaporation, maintaining soil moisture, inhibiting weed growth, inhibiting mineral element leaching, avoiding damage to the soil capillary structure by residual film fragments, and inhibiting soil compaction.

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