A kind of whole biological yield-increasing degradation agricultural film suitable for drought-resistant crop growth

Abstract

A kind of whole biological yield-increasing degradation agricultural film suitable for drought-resistant crop growth belongs to the field of degradation agricultural film, including surface layer, filling layer and inner layer;The filling layer includes the following weight parts of substances:PBAT 60-85 parts, PLA 3-7 parts, calcium carbonate 10-30 parts, filling layer additive 2.2-4.8 parts;The inner layer includes the following weight parts of substances:corn starch 40-50 parts, sugar-removed potato starch 3.2-4.4 parts, rapeseed oil extraction residue 10-20 parts, edible gelatin 10-20 parts, carrageenan 10-20 parts, inner layer additive 6.3-11.3 parts, calcium carbonate 10-20 parts, sorbitol 3.6-4.7 parts, humic acid 17-23 parts.In the present application, the surface layer, the filling layer and the inner layer are designed separately, which reduces the use amount of PBAT and PLA materials and lowers the cost of materials.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of degradable agricultural films, in particular to a full-biological yield-increasing degradable agricultural film suitable for the growth of drought-resistant crops. BACKGROUND

[0002] The full-biological degradable agricultural film is a material that can meet the use requirements in various aspects, has unchanged performance within the storage period, and can be degraded into harmless substances to the environment under natural environmental conditions after use. The main components of the full-biological degradable agricultural film are PBAT and PLA. PBAT is a thermoplastic biodegradable plastic, which is a copolymer of butylene glycol adipate and butylene glycol terephthalate. PBAT has poor tensile resistance, so it needs to be modified to increase its performance. At the same time, there may be a certain number of livestock near the cultivated land in the use area of the full-biological degradable agricultural film (especially in the Inner Mongolia Autonomous Region and the Xinjiang Uygur Autonomous Region). If the existing full-biological degradable agricultural film is eaten by livestock, it may cause discomfort to the livestock and lead to diseases of the livestock, thereby indirectly affecting livestock breeding. SUMMARY

[0003] The application provides a full-biological yield-increasing degradable agricultural film suitable for the growth of drought-resistant crops to solve the defects in the prior art.

[0004] The application is implemented by the following technical scheme:

[0005] A full-biological yield-increasing degradable agricultural film suitable for the growth of drought-resistant crops, comprising a surface layer, a filling layer, and an inner layer.

[0006] The surface layer comprises the following substances in parts by weight: PBAT 50-60 parts, PLA 3-7 parts, and surface layer additives 8.2-12.8 parts.

[0007] The filling layer comprises the following substances in parts by weight: PBAT 60-85 parts, PLA 3-7 parts, calcium carbonate 10-30 parts, and filling layer additives 2.2-4.8 parts.

[0008] The inner layer comprises the following substances in parts by weight: corn starch 40-50 parts, potato starch after sugar removal 3.2-4.4 parts, rapeseed oil pressing residue 10-20 parts, edible gelatin 10-20 parts, carrageenan 10-20 parts, inner layer additives 6.3-11.3 parts, calcium carbonate 10-20 parts, sorbitol 3.6-4.7 parts, and humic acid 17-23 parts.

[0009] The full-biological yield-increasing degradable agricultural film suitable for the growth of drought-resistant crops comprises the following substances in parts by weight in the surface layer additives: corn straw powder 3-5 parts, hydroxypropyl cellulose 0.5 part, vitamin E 0.5 part, tributyl citrate 5-8 parts, stearic acid 0.2-0.8 part, and deionized water 3-5 parts.

[0010] The preparation operation of the surface layer additive is as follows: corn straw powder, hydroxypropyl cellulose, vitamin E, tributyl citrate, stearic acid and deionized water are weighed according to the proportion, the corn straw powder, vitamin E and tributyl citrate are stirred and mixed in a stirring tank, the stearic acid and hydroxypropyl cellulose are then added and stirred and mixed, and finally the deionized water is added to delay the coagulation time, and the surface layer additive is obtained after mixing.

[0011] The filling layer of the full-biological yield-increasing and degradable agricultural film suitable for the growth of drought-resistant crops comprises the following components in parts by weight: vitamin E 0.5 parts, tributyl citrate 1-3 parts, stearic acid 0.2-0.8 parts, distearyl oxyisopropyl aluminum acid ester 0.5 parts, desugared potato starch 3.2-4.4 parts, calcium carbonate 10-20 parts, sorbitol 3.6-4.7 parts, and deionized water 10-13 parts.

[0012] The preparation operation of the filling layer additive is as follows: vitamin E, tributyl citrate, stearic acid, distearyl oxyisopropyl aluminum acid ester, desugared potato starch, calcium carbonate, sorbitol and deionized water are weighed according to the proportion, the vitamin E and tributyl citrate are stirred and mixed in a stirring tank, the stearic acid, distearyl oxyisopropyl aluminum acid ester, desugared potato starch, calcium carbonate and sorbitol are then added and stirred, and finally the deionized water is added to delay the coagulation time, and the filling layer additive is obtained after mixing.

[0013] The inner layer additive of the full-biological yield-increasing and degradable agricultural film suitable for the growth of drought-resistant crops comprises the following components in parts by weight: konjac mannans 0.8 parts, edible alkali 0.5 parts, and glycerol 5-10 parts.

[0014] The preparation operation of the inner layer additive is as follows: konjac mannans, edible alkali and glycerol are weighed according to the proportion, the konjac mannans and edible alkali are ground, stirred and mixed after grinding, glycerol is then added and stirred, and the stirred material is then placed in a negative pressure tank to remove air bubbles to obtain the inner layer additive.

[0015] The preparation process of the surface layer of the full-biological yield-increasing and degradable agricultural film suitable for the growth of drought-resistant crops comprises the following steps:

[0016] S1, PBAT, PLA and the surface layer additive are weighed according to the proportion, PBAT and PLA are placed in a clean tank for cleaning, PBAT and PLA are placed in a spin dryer for spin-drying after cleaning, and are left to stand for 12 hours to remove static electricity after spin-drying;

[0017] S2, PBAT and PLA left to stand are placed in a hot melting tank for high-temperature melting, the surface layer additive is added and continuously stirred, and the melted material is in a semi-transparent glue liquid state.

[0018] S3, the molten material is pressed into a film with a thickness of 2mm.

[0019] The preparation process of the filling layer comprises the following steps:

[0020] S1, PBAT, PLA, calcium carbonate and filling layer additives are weighed according to the proportion, placed in a clean tank for cleaning, and after cleaning, PBAT, PLA and calcium carbonate are placed in a spin dryer for spin drying, and after spin drying, they are left for 12h to remove static electricity;

[0021] S2, the PBAT, PLA and calcium carbonate left after standing are placed in a hot melt tank for high-temperature melting, and the filling layer additives are added for continuous stirring, and the molten glue liquid is obtained;

[0022] S3, the molten material is pressed into a film with a thickness of 4mm, and the film is pressed into a hole.

[0023] The preparation process of the inner layer comprises the following steps:

[0024] S1, corn starch, sugar-removed potato starch, rapeseed oil extraction residue, edible gelatin, carrageenan, inner layer additives, calcium carbonate, sorbitol and humic acid are weighed according to the proportion, the rapeseed oil extraction residue is crushed, and the corn starch and the crushed rapeseed oil extraction residue are added to a stirring tank and stirred uniformly;

[0025] S2, the edible gelatin and carrageenan are crushed and added to the stirred corn starch and rapeseed oil extraction residue for stirring and mixing again;

[0026] S3, the inner layer additives, calcium carbonate, sorbitol and humic acid are added and stirred to form a glue liquid for storage.

[0027] The preparation method of the full-biological yield-increasing degradable agricultural film suitable for drought-resistant crop growth comprises the following steps:

[0028] S1, the surface layer and the filling layer are bonded by hot pressing;

[0029] S2, the bonded surface layer and filling layer are taken out, the inner layer glue liquid is coated on the inner side of the filling layer, and the preparation of the degradable material is completed;

[0030] S3, the prepared degradable material is placed in a mold, and hot pressing is performed to obtain the full-biological yield-increasing degradable agricultural film suitable for drought-resistant crop growth.

[0031] The advantages of the present application are:

[0032] This invention uses a design that differentiates between the surface layer, the filling layer, and the inner layer to reduce the amount of PBAT and PLA materials used, thereby lowering the cost of the materials.

[0033] The materials used in the inner layer of this invention are all edible materials, used for food preservation, to avoid the direct contact of highly polluting additives with food, thus reducing food contamination, reducing the odor produced after heating, and being digestible by livestock if accidentally ingested, thereby reducing the impact on livestock health.

[0034] In this invention, the filler layer is used to connect the surface layer and the inner layer, and the surface layer is used to improve the tensile strength. The material prepared at the same cost has high tensile strength, thus improving the cost-effectiveness of the material.

[0035] In this invention, humic acid is added to the inner layer, which can release humic acid after degradation and thus increase production. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 This is a schematic diagram of the fully biodegradable agricultural film suitable for drought-resistant crop growth prepared in Example 3 of the present invention;

[0038] Figure 2 This is one of the schematic diagrams of the performance test report of the fully biodegradable agricultural film for drought-resistant crop growth prepared in Example 3 of the present invention;

[0039] Figure 3 This is the second schematic diagram of the performance test report of the fully biodegradable agricultural film suitable for drought-resistant crop growth prepared in Example 3 of the present invention;

[0040] Figure 4 This is the third schematic diagram of the performance test report of the fully biodegradable agricultural film for drought-resistant crop growth prepared in Example 3 of the present invention;

[0041] Figure 5 This is the fourth schematic diagram of the performance test report for the fully biodegradable agricultural film suitable for drought-resistant crop growth prepared in Example 3 of this invention. Detailed Implementation

[0042] In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0043] Embodiment 1

[0044] Step one: preparing the surface layer material

[0045] S1, PBAT 50 parts, PLA 3 parts and surface layer additive 8.2 parts are weighed according to the proportion, PBAT and PLA are placed in a cleaning tank for cleaning, and after cleaning, PBAT and PLA are placed in a spin dryer for spin-drying, and after spin-drying, they are left to stand for 12 hours to remove static electricity;

[0046] S2, PBAT and PLA left to stand are placed in a hot melt tank for high-temperature melting, surface layer additive is added for continuous stirring, and the melted material is formed into a semi-transparent glue liquid;

[0047] S3, the melted material is pressed into a film with a thickness of 2 mm;

[0048] The preparation operation of the surface layer additive is as follows: corn straw powder 3 parts, hydroxypropyl cellulose 0.5 parts, vitamin E 0.5 parts, tributyl citrate 5 parts, stearic acid 0.2 parts and deionized water 3 parts are weighed according to the proportion, the corn straw powder, vitamin E and tributyl citrate are added into a stirring tank for stirring and mixing, then stearic acid and hydroxypropyl cellulose are added in sequence for stirring and mixing, finally deionized water is added to delay the setting time, and the surface layer additive is obtained after mixing is completed;

[0049] Step two: preparing the filling layer material

[0050] S1, PBAT 60 parts, PLA 3 parts, calcium carbonate 10 parts and filling layer additive 2.2 parts are weighed according to the proportion, and then they are respectively placed in a cleaning tank for cleaning, and after cleaning, PBAT, PLA and calcium carbonate are placed in a spin dryer for spin-drying, and after spin-drying, they are left to stand for 12 hours to remove static electricity;

[0051] S2, PBAT, PLA and calcium carbonate left to stand are placed in a hot melt tank for high-temperature melting, filling layer additive is added for continuous stirring, and the melted material is formed into a transparent glue liquid;

[0052] S3, the melted material is pressed into a film with a thickness of 4 mm, and holes are pressed in the prepared film;

[0053] The preparation operation of the filling layer additive is as follows: vitamin E 0.5 parts, tributyl citrate 1 part, stearic acid 0.2 part, distearyl oxyisopropylaluminum acid ester 0.5 part, desugared potato starch 3.2 parts, calcium carbonate 10 parts, sorbitol 3.6 parts, and deionized water 10 parts are weighed according to the proportion, vitamin E and tributyl citrate are stirred and mixed in a stirring tank, stearic acid, distearyl oxyisopropylaluminum acid ester, desugared potato starch, calcium carbonate, and sorbitol are added in sequence and stirred, deionized water is finally added to delay the coagulation time, and the filling layer additive is obtained after mixing.

[0054] Step three: preparing the inner layer material

[0055] S1, corn starch 40 parts, desugared potato starch 3.2 parts, rapeseed oil residue 10 parts, edible gelatin 10 parts, carrageenan 10 parts, inner layer additive 6.3 parts, calcium carbonate 10 parts, sorbitol 3.6 parts, and humic acid 17 parts are weighed according to the proportion, the rapeseed oil residue is crushed, and the corn starch and the crushed rapeseed oil residue are added to a stirring tank and stirred uniformly;

[0056] S2, the edible gelatin and the carrageenan are crushed and put into the stirred corn starch and rapeseed oil residue and stirred again;

[0057] S3, the inner layer additive, calcium carbonate, sorbitol, and humic acid are added and stirred to form a glue liquid for storage;

[0058] The preparation operation of the inner layer additive is as follows: konjac mannans 0.8 parts, edible alkali 0.5 parts, and glycerol 5 parts are weighed according to the proportion, the konjac mannans and the edible alkali are ground, stirred and mixed after grinding, glycerol is added and stirred after mixing, and then the stirred material is put into a negative pressure tank to remove material bubbles to obtain the inner layer additive;

[0059] Step four: preparing a mixed film of the surface layer, the filling layer, and the inner layer

[0060] S1, the surface layer and the filling layer are bonded by using hot pressing;

[0061] S2, the bonded surface layer and filling layer are taken out, the inner layer glue liquid is coated on the inner side of the filling layer, and the preparation of the degradable material is completed;

[0062] S3, the prepared degradable material is placed in a mold for hot pressing and shaping to obtain a full-biological yield-increasing degradable agricultural film suitable for drought-resistant crop growth.

[0063] Example 2

[0064] Step one: preparing the surface layer material

[0065] S1, according to the proportioning PBAT 60 parts, PLA 37 parts, surface layer additive 12.8 parts, PBAT and PLA are placed in a clean tank for cleaning, and after cleaning, PBAT and PLA are placed in a spin dryer for spin-drying, and after spin-drying, they are left for 12 hours to remove static electricity;

[0066] S2, the PBAT and PLA after standing are placed in a hot melt tank for high temperature melting, the surface layer additive is added for continuous stirring, and the melted material is in a semi-transparent glue liquid state;

[0067] S3, the melted material is pressed into a film with a thickness of 2mm;

[0068] The preparation operation of the surface layer additive is as follows: corn straw powder 5 parts, hydroxypropyl cellulose 0.5 parts, vitamin E 0.5 parts, tributyl citrate 8 parts, stearic acid 0.8 parts, and deionized water 5 parts are weighed according to the proportion, and the corn straw powder, vitamin E and tributyl citrate are added to the stirring tank and stirred and mixed, then the stearic acid and hydroxypropyl cellulose are added in sequence and stirred and mixed, finally the deionized water is added to delay the setting time, and the surface layer additive is obtained after mixing;

[0069] Step two: preparation of filling layer material

[0070] S1, according to the proportioning PBAT 85 parts, PLA 7 parts, calcium carbonate 0 parts, filling layer additive 4.8 parts, then they are respectively placed in a clean tank for cleaning, and after cleaning, PBAT, PLA and calcium carbonate are placed in a spin dryer for spin-drying, and after spin-drying, they are left for 12 hours to remove static electricity;

[0071] S2, the PBAT, PLA and calcium carbonate after standing are placed in a hot melt tank for high temperature melting, the filling layer additive is added for continuous stirring, and the melted material is in a transparent glue liquid state;

[0072] S3, the melted material is pressed into a film with a thickness of 4mm, and the prepared film is punched;

[0073] The preparation operation of the filling layer additive is as follows: vitamin E 0.5 parts, tributyl citrate 3 parts, stearic acid 0.8 parts, distearyl oxyisopropylaluminum acid ester 0.5 parts, desugared potato starch 4.4 parts, calcium carbonate 20 parts, sorbitol 4.7 parts, and deionized water 13 parts are weighed according to the proportion, and the vitamin E and tributyl citrate are added to the stirring tank and stirred and mixed, then the stearic acid, distearyl oxyisopropylaluminum acid ester, desugared potato starch, calcium carbonate and sorbitol are added in sequence and stirred, finally the deionized water is added to delay the setting time, and the filling layer additive is obtained after mixing;

[0074] Step three: preparation of inner layer material

[0075] S1, according to the proportion of corn starch 50 parts, sugar after the potato starch 4.4 parts, rapeseed oil residue 20 parts, edible gelatin 20 parts, carrageenan 20 parts, inner layer additive 11.3 parts, calcium carbonate 20 parts, sorbitol 4.7 parts, humic acid 23 parts, the rapeseed oil residue is crushed, the corn starch and the crushed rapeseed oil residue are added to the stirring tank and stirred uniformly;

[0076] S2, crush edible gelatin and carrageenan, and put them into the stirred corn starch and rapeseed oil residue and stir again;

[0077] S3, add the inner layer additive, calcium carbonate, sorbitol and humic acid and mix and stir, and store in the form of glue liquid;

[0078] Among them, the preparation operation of the inner layer additive is: according to the proportion of konjac mannan 0.8 parts, edible alkali 0.5 parts, glycerol 10 parts, grind konjac mannan and edible alkali, stir after grinding, add glycerol after mixing, then put the stirred material into a negative pressure tank to remove material bubbles to get the inner layer additive;

[0079] Step four: preparation of mixed film of surface layer, filling layer and inner layer

[0080] S1, use hot pressing method to bond the surface layer and the filling layer;

[0081] S2, take out the bonded surface layer and filling layer, and coat the molten glue liquid of the inner layer to the inside of the filling layer to complete the preparation of the degradation material;

[0082] S3, place the prepared degradation material into the mold and perform hot pressing shaping operation to get the full biological yield-increasing degradation agricultural film suitable for drought-resistant crop growth.

[0083] Example 3

[0084] Step one: preparation of surface layer material

[0085] S1, according to the proportion of PBAT 55 parts, PLA 5 parts, surface layer additive 10.5 parts, PBAT and PLA are placed in a clean tank for cleaning, after cleaning, PBAT and PLA are placed in a spin dryer for spin-drying, and after spin-drying, they are left to stand for 12h to remove static electricity;

[0086] S2, put the PBAT and PLA after standing into a hot melting tank for high temperature melting, add the surface layer additive and continue to stir, and melt into a semi-transparent glue liquid;

[0087] S3, press the melted material into a film with a thickness of 2mm;

[0088] The preparation operation of the surface layer additive is as follows: corn straw powder 4 parts, hydroxypropyl cellulose 0.5 parts, vitamin E 0.5 parts, tributyl citrate 6.5 parts, stearic acid 0.5 parts, and deionized water 4 parts are weighed according to the proportion, the corn straw powder, vitamin E, and tributyl citrate are stirred and mixed in a stirring tank, then the stearic acid and hydroxypropyl cellulose are sequentially added and stirred and mixed, finally the deionized water is added to delay the coagulation time, and the surface layer additive is obtained after mixing;

[0089] Step two: preparing the filling layer material

[0090] S1, PBAT 73 parts, PLA 5 parts, calcium carbonate 20 parts, and filling layer additive 3.5 parts are weighed according to the proportion, and then they are respectively placed in a clean tank for cleaning, after cleaning, the PBAT, PLA, and calcium carbonate are placed in a spin dryer for spin-drying, and after spin-drying, they are left to stand for 12 hours to remove static electricity;

[0091] S2, the PBAT, PLA, and calcium carbonate after standing are placed in a hot melt tank for high-temperature melting, the filling layer additive is added for continuous stirring, and the melted material is in the form of glue liquid;

[0092] S3, the melted material is pressed into a film with a thickness of 4 mm, and holes are pressed in the prepared film;

[0093] The preparation operation of the filling layer additive is as follows: vitamin E 0.5 parts, tributyl citrate 2 parts, stearic acid 0.5 parts, distearyl oxyisopropylaluminum acid ester 0.5 parts, desugared potato starch 3.8 parts, calcium carbonate 15 parts, sorbitol 4.2 parts, and deionized water 11.5 parts are weighed according to the proportion, the vitamin E and tributyl citrate are stirred and mixed in a stirring tank, then the stearic acid, distearyl oxyisopropylaluminum acid ester, desugared potato starch, calcium carbonate, and sorbitol are sequentially added and stirred, finally the deionized water is added to delay the coagulation time, and the filling layer additive is obtained after mixing;

[0094] Step three: preparing the inner layer material

[0095] S1, corn starch 45 parts, desugared potato starch 3.8 parts, rapeseed oil extraction residue 15 parts, edible gelatin 15 parts, carrageenan 15 parts, inner layer additive 8.8 parts, calcium carbonate 15 parts, sorbitol 4.1 parts, and humic acid 20 parts are weighed according to the proportion, the rapeseed oil extraction residue is crushed, and the corn starch and the crushed rapeseed oil extraction residue are added to a stirring tank and stirred uniformly;

[0096] S2, the edible gelatin and the carrageenan are crushed and then added to the stirred corn starch and rapeseed oil extraction residue for stirring and mixing again;

[0097] S3, the inner layer additive, calcium carbonate, sorbitol, and humic acid are added and stirred and mixed, and the glue liquid is stored;

[0098] The preparation operation of the inner layer additive is as follows: 0.8 parts of konjac mannan, 0.5 parts of edible alkali and 7.5 parts of glycerol are weighed according to the proportion, the konjac mannan and the edible alkali are ground, and then stirred and mixed after grinding, glycerol is added after mixing, and then the stirred material is placed in a negative pressure tank to remove the material bubbles to obtain the inner layer additive;

[0099] Step four: preparing a mixed film of the surface layer, the filling layer and the inner layer

[0100] S1, using a hot pressing method to bond the surface layer and the filling layer;

[0101] S2, taking out the bonded surface layer and filling layer, coating the molten glue solution of the inner layer to the inner side of the filling layer, and completing the preparation of the degradable material;

[0102] S3, placing the prepared degradable material into a mold to perform a hot pressing shaping operation to obtain a full-biological yield-increasing degradable agricultural film suitable for drought-resistant crop growth (as shown in Figure 1 ).

[0103] The full-biological yield-increasing degradable agricultural film suitable for drought-resistant crop growth prepared in Examples 1-3 and two similar cost degradable film materials on the market (denoted as Comparative Examples 1 and 2) are subjected to performance detection (the performance detection report of Example 3 is shown in Figures 2-5 ), and the results are shown in Table 1.

[0104]

[0105] Note: The impact resistance performance is divided into five levels: excellent, good, general, poor and very poor, the high-temperature odor intensity can be divided into five levels: very low, low, moderate, high and very high, the low-temperature odor intensity can be divided into five levels: very low, low, moderate, high and very high, the hardness can be divided into five levels: very high, high, moderate, low and very low, the cost can be divided into five levels: very high, high, moderate, low and very low, the product after use is divided into Example 1-3 and Comparative Example 1-2 groups for corn planting in a test field (Dangpu Village, Qingshan District, Baotou City, Inner Mongolia, the soil type is chestnut calcareous soil, the soil basic fertility before the test is measured as follows: pH value 8.3, organic matter content 35-50 g / kg, alkali-hydrolyzable nitrogen content 50-68 mg / kg, available phosphorus content 10-16 mg / kg, available potassium content 150-180 mg / kg, the soil fertility is uniform, the terrain is flat, and the irrigation is convenient), the corresponding degradable agricultural films are used, and the subsequent fertilization and irrigation operations are the same, and the subsequent corn yield is recorded; the comprehensive performance can be divided into five levels: excellent, A, B, C and poor.

[0106] From the data in the above table, the comprehensive performance of the drought-resistant crop growth all-biological yield-increasing degradable agricultural film prepared in the embodiments 1-3 of the present application is higher than that of similar price materials on the market (comparative examples 1-2), and the cost is relatively lower than that on the market, the material has excellent tensile and right-angle tear load, good impact resistance, can meet the strength requirement, can also play a role in increasing yield, and can reduce the production cost, so that the high-performance degradable agricultural film can be produced under the premise of low cost, so that the degradable agricultural film of the present application can be widely applied.

[0107] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A fully biodegradable agricultural film suitable for use in the growth of drought tolerant crops, characterized in that: The surface layer, the filling layer and the inner layer are included. The surface layer includes the following components in parts by weight: PBAT 50-60 parts, PLA 3-7 parts, surface layer additive 8.2-12.8 parts. The surface layer additive includes the following components in parts by weight: corn straw powder 3-5 parts, hydroxypropyl cellulose 0.5 part, vitamin E 0.5 part, tributyl citrate 5-8 parts, stearic acid 0.2-0.8 part, deionized water 3-5 parts. The filling layer includes the following components in parts by weight: PBAT 60-85 parts, PLA 3-7 parts, calcium carbonate 10-30 parts, filling layer additive 2.2-4.8 parts. The filling layer additive includes the following components in parts by weight: vitamin E 0.5 part, tributyl citrate 1-3 parts, stearic acid 0.2-0.8 part, distearoyl oxyisopropylaluminum acid ester 0.5 part, desugared potato starch 3.2-4.4 parts, calcium carbonate 10-20 parts, sorbitol 3.6-4.7 parts, deionized water 10-13 parts. The inner layer includes the following components in parts by weight: corn starch 40-50 parts, desugared potato starch 3.2-4.4 parts, rapeseed oil extraction residue 10-20 parts, edible gelatin 10-20 parts, carrageenan 10-20 parts, inner layer additive 6.3-11.3 parts, calcium carbonate 10-20 parts, sorbitol 3.6-4.7 parts, humic acid 17-23 parts. The inner layer additive includes the following components in parts by weight: konjac mannan 0.8 part, edible alkali 0.5 part, glycerol 5-10 parts.

2. A fully bio-degradable farm film suitable for growth of drought tolerant crops as claimed in claim 1, wherein: The preparation operation of the surface layer additive is as follows: corn straw powder, hydroxypropyl cellulose, vitamin E, tributyl citrate, stearic acid and deionized water are weighed according to the proportion, corn straw powder, vitamin E and tributyl citrate are added into a stirring tank and stirred and mixed, stearic acid and hydroxypropyl cellulose are added in sequence and stirred and mixed, deionized water is finally added to delay the setting time, and the surface layer additive is obtained after mixing.

3. A fully bio-degradable farm film suitable for growth of drought tolerant crops as claimed in claim 1, wherein: The preparation operation of the filling layer additive is as follows: vitamin E, tributyl citrate, stearic acid, distearoyl oxyisopropylaluminum acid ester, desugared potato starch, calcium carbonate, sorbitol and deionized water are weighed according to the proportion, vitamin E and tributyl citrate are added into a stirring tank and stirred and mixed, stearic acid, distearoyl oxyisopropylaluminum acid ester, desugared potato starch, calcium carbonate and sorbitol are added in sequence and stirred, deionized water is finally added to delay the setting time, and the filling layer additive is obtained after mixing.

4. A fully bio-degradable farm film suitable for growth of drought tolerant crops as claimed in claim 1, wherein: The preparation operation of the inner layer additive is as follows: konjac mannan, edible alkali and glycerol are weighed according to the proportion, konjac mannan and edible alkali are ground, stirred and mixed after grinding, glycerol is added after mixing, the stirred material is then put into a negative pressure tank to remove the material bubbles, and the inner layer additive is obtained.

5. A fully bio-degradable farm film suitable for growth of drought tolerant crops as claimed in claim 1, wherein: The preparation process of the surface layer includes the following steps: S1, PBAT, PLA and the surface layer additive are weighed according to the proportion, PBAT and PLA are placed into a clean tank for cleaning, PBAT and PLA are placed into a spin dryer for spinning after cleaning, and are left to stand for 12 hours to remove static electricity; S2, the PBAT and PLA after standing are placed into a hot melting tank for high temperature melting, surface layer additives are added for continuous stirring, and the melted material is in a semi-transparent glue liquid state; S3, the melted material is pressed into a 2mm thick film.

6. A fully bio-degradable farm film suitable for growth of drought tolerant crops as claimed in claim 1, wherein: The preparation process of the filling layer comprises the following steps: S1, PBAT, PLA, calcium carbonate and filling layer additives are weighed according to the proportion, placed in a clean tank for cleaning, and after cleaning, PBAT, PLA and calcium carbonate are placed in a drying machine for drying, and after drying, they are left for 12h to remove static electricity; S2, the PBAT, PLA and calcium carbonate after standing are placed into a hot melting tank for high temperature melting, filling layer additives are added for continuous stirring, and the melted material is in a transparent glue liquid state; S3, the melted material is pressed into a 4mm thick film, and holes are punched in the film.

7. A fully bio-degradable farm film suitable for growth of drought tolerant crops as claimed in claim 1, wherein: The preparation process of the inner layer comprises the following steps: S1, corn starch, desugared potato starch, rapeseed oil extraction residue, edible gelatin, carrageenan, inner layer additives, calcium carbonate, sorbitol and humic acid are weighed according to the proportion, the rapeseed oil extraction residue is crushed, the corn starch and the crushed rapeseed oil extraction residue are added to a stirring tank and stirred uniformly; S2, the edible gelatin and carrageenan are crushed and placed in the stirred corn starch and rapeseed oil extraction residue for further stirring and mixing; S3, the inner layer additives, calcium carbonate, sorbitol and humic acid are added and stirred to form a glue liquid for storage.

8. A fully bio-degradable farm film suitable for growth of drought tolerant crops as claimed in claim 1, wherein: The preparation method comprises the following steps: S1, the surface layer and the filling layer are bonded by hot pressing; S2, the bonded surface layer and filling layer are taken out, the inner layer melted glue liquid is coated on the inside of the filling layer, and the preparation of the degradable material is completed; S3, the prepared degradable material is placed in a mold for hot pressing and shaping to obtain a full-biological yield-increasing degradable agricultural film suitable for drought-resistant crop growth.

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