CN109180971B - Water-retaining environment-friendly lignin-starch-kenaf composite mulching film and preparation method thereof - Google Patents
Water-retaining environment-friendly lignin-starch-kenaf composite mulching film and preparation method thereof Download PDFInfo
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Abstract
The invention belongs to the technical field of agricultural films, and provides a water-retaining environment-friendly lignin-starch-kenaf composite mulching film and a preparation method thereof. According to the method, lignin is sulfonated, then mixed with a starch solution and subjected to tape casting to form a film, so that a lignin-starch composite film is prepared, and the lignin-starch-kenaf composite film is further subjected to pressing and compounding with a kenaf paper mulching film, so that the lignin-starch-kenaf composite mulching film is prepared. Compared with the traditional method, the composite mulching film prepared by the invention has the advantages of good biodegradability, excellent environmental protection performance, higher film strength, good water resistance and good water retention performance, can obtain composite films with different air permeability and different heat preservation performance according to different requirements so as to meet the use requirements of different areas and different seasons, and has wide raw material sources, low cost and high product cost performance.
Description
Technical Field
The invention belongs to the technical field of agricultural films, and provides a water-retaining environment-friendly lignin-starch-kenaf composite mulching film and a preparation method thereof.
Background
The agricultural film is important agricultural production information following seeds, chemical fertilizers and pesticides, and the application of the agricultural film brings a revolution to agricultural production in China and makes important contributions to agricultural efficiency improvement and farmer income increase. Mainly comprises modern agricultural covering materials such as shed films, mulching films, films for forage grass, sun-shading nets, insect-proof nets and the like. The commonly used films are common polyvinyl chloride films, polyvinyl chloride non-drop films, common polyethylene films, polyethylene non-drop films, polyethylene multifunctional composite films, EVA multifunctional composite films and the like. With the rapid development of agricultural science and technology, the demand for mulching films will continue to increase.
Among the functions of agricultural mulching films, water retention is an important item, and water retention is also an important index for evaluating soil. The water is a basic element for plant growth, and China, as one of countries lacking water resources in the world, is very important for improving the utilization rate of agricultural irrigation water, not only can improve the agricultural production benefit, but also can alleviate the situation of water resource shortage. Therefore, improving the water retention performance of the mulching film becomes an important content for the development of agricultural mulching films.
Meanwhile, because of the disposable use of the mulching film, a large amount of residual mulching film is left in the soil every year. Most of the plastic mulching films are polyethylene with molecular weight of tens of thousands to hundreds of thousands, and the polyethylene is difficult to degrade in nature. The fragments of the mulching film can form a negative interlayer in the soil, so that the flow of water, gas, fertilizer and the like in the soil is blocked, the soil structure is hardened, the ecological environment is seriously damaged, and white pollution is caused. Therefore, solving the problem of soil pollution caused by residual mulching has become a urgent necessity for mulching cultivation technology, and research on degradable mulching films is carried out to solve the problem.
The Chinese patent application No. 201510041925.5 discloses a degradable water-retaining mulching film, which comprises fermentation liquor, lignocellulose and calcium lignosulfonate formed by fermentation culture medium mainly prepared by fermenting monosodium glutamate waste residues with bacillus amyloliquefaciens IAE, wherein the volume mass ratio of the fermentation liquor, the lignocellulose and the calcium lignosulfonate is 2L: 3-5 kg: 0.05-0.1 kg. But has the disadvantages of unsatisfactory water retention effect and poor strength.
The Chinese patent application No. 201710626450.5 discloses a water-retaining and fertility-increasing biodegradable agricultural mulching film and a preparation method thereof, and the preparation process comprises the following steps: (1) heating the ground low-rank coal and a KOH solution to 40-90 ℃, performing suction filtration to obtain a filtrate while the low-rank coal and the KOH solution are hot after reaction, cooling, adjusting the pH value to be acidic, standing until no fixed objects are separated out, performing reduced pressure suction filtration, and drying a filter cake to obtain low-rank coal-based humic acid; (2) reacting the low-order coal-based humic acid with a hydrophilic monomer, an initiator and a cross-linking agent to prepare the low-order coal-based humic acid super absorbent resin; (3) mixing and granulating the biodegradable material and the low-order coal-based humic acid super absorbent resin, and blowing the mixture to obtain the water-retention and fertility-increasing biodegradable agricultural mulching film. But has the disadvantages of undesirable biodegradability, poor strength, and the like.
In conclusion, in the current common agricultural mulching film, the water retention performance needs to be improved, the problem of poor degradability generally exists, the influence of the accumulation of residual films on the soil quality and fertility is large, and the sustainable development of the agricultural mulching film is restricted, so that the development of the degradable composite bottom film with excellent water retention performance has important significance.
Disclosure of Invention
Therefore, the agricultural mulching film in the prior art has the defects of poor degradability and unsatisfactory water retention performance. Aiming at the situation, the water-retention environment-friendly lignin-starch-kenaf composite mulching film and the preparation method thereof are provided, the water retention performance of the mulching film can be effectively improved, and the mulching film is good in biodegradability and good in application prospect.
In order to achieve the purpose, the invention relates to the following specific technical scheme:
a preparation method of a water-retaining environment-friendly lignin-starch-kenaf composite mulching film comprises the following specific steps:
(1) adding lignin into an aqueous solution of sodium sulfite, adding an oxidant, adjusting the pH value to 13-14, and heating for reaction to obtain sulfonated lignin;
(2) gelatinizing starch particles, adding the starch particles into a polyvinyl alcohol solution, heating to 92-96 ℃, stirring until the starch particles are completely dissolved, then adding the sulfonated lignin prepared in the step (1), a cross-linking agent, a plasticizer, polyacrylamide, nano calcium carbonate and sodium dodecyl benzene sulfonate, stirring and mixing uniformly, and carrying out tape casting to form a film and drying to obtain a lignin-starch composite film;
(3) making kenaf stalk into kenaf stalk powder by a stalk crusher, mixing the kenaf stalk powder with carboxymethyl cellulose, glycerol, gelatin and water to prepare slurry, pulping and making paper mulching film;
(4) and (3) coating a layer of polyurethane on the surface of the lignin-starch composite film prepared in the step (2), covering the kenaf paper mulching film prepared in the step (3), and pressing and compounding to prepare the water-retaining environment-friendly lignin-starch-kenaf composite mulching film.
Preferably, the oxidant in step (1) is at least one of ferric sulfate, ferric bromide, ferric chloride and ferric nitrate.
Preferably, the heating reaction in the step (1) is carried out at the temperature of 120-130 ℃ for 3-4 hours.
Preferably, the raw materials in the step (1) comprise, by weight, 40-45 parts of lignin, 3-5 parts of sodium sulfite, 48-56 parts of water and 1-2 parts of an oxidizing agent.
Preferably, the mass concentration of the polyvinyl alcohol solution in the step (2) is 15-20%.
Preferably, the cross-linking agent in step (2) is at least one of formaldehyde, glyoxal and succinaldehyde.
Preferably, the plasticizer in step (2) is at least one of ethylene glycol, propylene glycol, isobutanol, isoprene glycol and triethanolamine.
Preferably, the raw materials in the step (2) comprise, by weight, 20-22 parts of gelatinized starch particles, 28-43 parts of polyvinyl alcohol solution, 1-3 parts of a cross-linking agent, 1-2 parts of a plasticizer, 20-24 parts of sulfonated lignin, 8-11 parts of polyacrylamide, 6-8 parts of nano calcium carbonate and 1-2 parts of sodium dodecyl benzene sulfonate.
Preferably, the raw materials in the step (3) comprise, by weight, 33-36 parts of kenaf stalk powder, 8-12 parts of carboxymethyl cellulose, 4-8 parts of glycerol, 5-8 parts of gelatin and 36-50 parts of water.
The invention also provides the water-retaining environment-friendly lignin-starch-kenaf composite mulching film prepared by the preparation method. The composite mulching film is prepared by sulfonating lignin, mixing the sulfonated lignin with a starch solution, casting the mixture into a film to prepare a lignin-starch composite film, and further pressing and compounding the lignin-starch composite film with a kenaf paper mulching film.
The invention provides a water-retaining environment-friendly lignin-starch-kenaf composite mulching film and a preparation method thereof, compared with the prior art, the water-retaining environment-friendly lignin-starch-kenaf composite mulching film has the outstanding characteristics and excellent effects that:
1. in the composite mulching film prepared by the invention, the lignin, the starch, the kenaf stalk powder and the polyvinyl alcohol are all biodegradable materials, and the mulching film can be directly mixed with fertilizer to be buried in soil without being recycled.
2. In the preparation process, starch and modified lignin are subjected to a crosslinking reaction in the film forming process, so that the strength of the composite film is improved, the water resistance is improved, and the composite film has good water retention performance.
3. The method can prepare the kenaf paper ground film layers with different densities by adjusting the papermaking process so as to prepare the composite films with different air permeability and different heat preservation performance, thereby meeting the use requirements of different regions and different seasons.
4. The invention has wide source of raw materials, low cost and high cost performance of products.
Detailed Description
The present invention will be described in further detail with reference to specific embodiments, but it should not be construed that the scope of the present invention is limited to the following examples. Various substitutions and alterations can be made by those skilled in the art and by conventional means without departing from the spirit of the method of the invention described above.
Example 1
(1) Adding lignin into an aqueous solution of sodium sulfite, adding an oxidant, adjusting the pH value to 13, and heating for reaction to prepare sulfonated lignin; the oxidant is ferric sulfate; the heating reaction temperature is 126 ℃, and the time is 3.5 h; the raw materials comprise 43 parts by weight of lignin, 4 parts by weight of sodium sulfite, 52 parts by weight of water and 1 part by weight of an oxidant;
(2) gelatinizing starch microparticles, adding the starch microparticles into a polyvinyl alcohol solution, heating to 93 ℃, stirring until the starch microparticles are completely dissolved, then adding the sulfonated lignin prepared in the step (1), a cross-linking agent, a plasticizer, polyacrylamide, nano calcium carbonate and sodium dodecyl benzene sulfonate, stirring and mixing uniformly, and carrying out tape casting to form a film and drying to obtain a lignin-starch composite film; the mass concentration of the polyvinyl alcohol solution is 17%; the cross-linking agent is formaldehyde; the plasticizer is glycol; the raw materials comprise, by weight, 21 parts of gelatinized starch particles, 37 parts of polyvinyl alcohol solution, 2 parts of a cross-linking agent, 1 part of a plasticizer, 21 parts of sulfonated lignin, 9 parts of polyacrylamide, 7 parts of nano calcium carbonate and 2 parts of sodium dodecyl benzene sulfonate;
(3) making kenaf stalk into kenaf stalk powder by a stalk crusher, mixing the kenaf stalk powder with carboxymethyl cellulose, glycerol, gelatin and water to prepare slurry, pulping and making paper mulching film; the weight parts of the raw materials are 35 parts of kenaf stalk powder, 9 parts of carboxymethyl cellulose, 5 parts of glycerol, 7 parts of gelatin and 44 parts of water;
(4) and (3) coating a layer of polyurethane on the surface of the lignin-starch composite film prepared in the step (2), covering the kenaf paper mulching film prepared in the step (3), and pressing and compounding to prepare the water-retaining environment-friendly lignin-starch-kenaf composite mulching film.
The test method comprises the following steps:
(1) water retention: weighing treated river sand and soil, mixing the soil according to the standard of 1:1, adding the soil into a plastic cup, adding a proper amount of tap water to saturate water absorption, tightly wrapping the soil by using the composite mulching film prepared by the invention, and weighing the initial weight m0Placing in outdoor air drying environment, weighing total weight m in 7d, 15d, and 30d respectivelyiTesting for 3 times, and calculating the average value R of the soil water retention rate according to a formulai=mi/m0×100%；
(2) Soil burying biodegradation rate: weighing a certain weight of the composite mulching film M prepared by the invention0Burying under the ground surface of common planting soil at about 10cm, taking out at 20d, 40d and 60d, respectively, cleaning with water and anhydrous ethanol, drying, and weighing MiTaking 3 pieces of each sample as a group, and calculating the average value A of the soil landfill biodegradation ratei=［（Mi－M0）/ M0］×100%；
(3) Tensile strength: the thickness of the degradable film is measured by using a domestic 0-25 type screw micrometer, the mechanical property of the film is tested by using a universal electronic material testing machine, the degradable plastic film prepared by the invention is cut into strips with the length of 50mm and the width of 10mm, the stretching speed is set to be 5mm/min, each sample is longitudinally tested for 3 times, the stretching strength is measured, and the average value is calculated;
the data obtained are shown in Table 1.
Example 2
(1) Adding lignin into an aqueous solution of sodium sulfite, adding an oxidant, adjusting the pH value to 14, and heating for reaction to prepare sulfonated lignin; the oxidant is ferric bromide; the heating reaction temperature is 120 ℃, and the time is 4 h; the raw materials comprise 40 parts by weight of lignin, 3 parts by weight of sodium sulfite, 56 parts by weight of water and 1 part by weight of oxidant;
(2) gelatinizing starch microparticles, adding the starch microparticles into a polyvinyl alcohol solution, heating to 92 ℃, stirring until the starch microparticles are completely dissolved, then adding the sulfonated lignin prepared in the step (1), a cross-linking agent, a plasticizer, polyacrylamide, nano calcium carbonate and sodium dodecyl benzene sulfonate, stirring and mixing uniformly, and carrying out tape casting to form a film and drying to obtain a lignin-starch composite film; the mass concentration of the polyvinyl alcohol solution is 15 percent; the cross-linking agent is glyoxal; the plasticizer is propylene glycol; the weight parts of the raw materials are 20 parts of gelatinized starch particles, 43 parts of polyvinyl alcohol solution, 1 part of cross-linking agent, 1 part of plasticizer, 20 parts of sulfonated lignin, 8 parts of polyacrylamide, 6 parts of nano calcium carbonate and 1 part of sodium dodecyl benzene sulfonate;
(3) making kenaf stalk into kenaf stalk powder by a stalk crusher, mixing the kenaf stalk powder with carboxymethyl cellulose, glycerol, gelatin and water to prepare slurry, pulping and making paper mulching film; the weight parts of the raw materials are 33 parts of kenaf stalk powder, 8 parts of carboxymethyl cellulose, 4 parts of glycerol, 5 parts of gelatin and 50 parts of water;
(4) and (3) coating a layer of polyurethane on the surface of the lignin-starch composite film prepared in the step (2), covering the kenaf paper mulching film prepared in the step (3), and pressing and compounding to prepare the water-retaining environment-friendly lignin-starch-kenaf composite mulching film.
The test method was in accordance with example 1, and the data obtained are shown in Table 1.
Example 3
(1) Adding lignin into an aqueous solution of sodium sulfite, adding an oxidant, adjusting the pH value to 13, and heating for reaction to prepare sulfonated lignin; the oxidant is ferric chloride; the heating reaction temperature is 130 ℃, and the time is 3 h; the raw materials comprise 45 parts by weight of lignin, 5 parts by weight of sodium sulfite, 48 parts by weight of water and 2 parts by weight of an oxidant;
(2) gelatinizing starch microparticles, adding the starch microparticles into a polyvinyl alcohol solution, heating to 96 ℃, stirring until the starch microparticles are completely dissolved, then adding the sulfonated lignin prepared in the step (1), a cross-linking agent, a plasticizer, polyacrylamide, nano calcium carbonate and sodium dodecyl benzene sulfonate, stirring and mixing uniformly, and carrying out tape casting to form a film and drying to obtain a lignin-starch composite film; the mass concentration of the polyvinyl alcohol solution is 20 percent; the cross-linking agent is succinaldehyde; the plasticizer is isobutanol; the raw materials comprise, by weight, 22 parts of gelatinized starch particles, 28 parts of polyvinyl alcohol solution, 3 parts of cross-linking agent, 2 parts of plasticizer, 24 parts of sulfonated lignin, 11 parts of polyacrylamide, 8 parts of nano calcium carbonate and 2 parts of sodium dodecyl benzene sulfonate;
(3) making kenaf stalk into kenaf stalk powder by a stalk crusher, mixing the kenaf stalk powder with carboxymethyl cellulose, glycerol, gelatin and water to prepare slurry, pulping and making paper mulching film; the weight parts of the raw materials are 36 parts of kenaf stalk powder, 12 parts of carboxymethyl cellulose, 8 parts of glycerol, 8 parts of gelatin and 36 parts of water;
(4) and (3) coating a layer of polyurethane on the surface of the lignin-starch composite film prepared in the step (2), covering the kenaf paper mulching film prepared in the step (3), and pressing and compounding to prepare the water-retaining environment-friendly lignin-starch-kenaf composite mulching film.
The test method was in accordance with example 1, and the data obtained are shown in Table 1.
Example 4
(1) Adding lignin into an aqueous solution of sodium sulfite, adding an oxidant, adjusting the pH value to 14, and heating for reaction to prepare sulfonated lignin; the oxidant is ferric nitrate; the heating reaction temperature is 123 ℃, and the time is 4 h; the raw materials comprise, by weight, 42 parts of lignin, 3 parts of sodium sulfite, 53 parts of water and 2 parts of an oxidant;
(2) gelatinizing starch microparticles, adding the starch microparticles into a polyvinyl alcohol solution, heating to 93 ℃, stirring until the starch microparticles are completely dissolved, then adding the sulfonated lignin prepared in the step (1), a cross-linking agent, a plasticizer, polyacrylamide, nano calcium carbonate and sodium dodecyl benzene sulfonate, stirring and mixing uniformly, and carrying out tape casting to form a film and drying to obtain a lignin-starch composite film; the mass concentration of the polyvinyl alcohol solution is 16%; the cross-linking agent is formaldehyde; the plasticizer is isoprene glycol; the raw materials comprise, by weight, 21 parts of gelatinized starch particles, 39 parts of polyvinyl alcohol solution, 2 parts of a cross-linking agent, 1 part of a plasticizer, 21 parts of sulfonated lignin, 9 parts of polyacrylamide, 6 parts of nano calcium carbonate and 1 part of sodium dodecyl benzene sulfonate;
(3) making kenaf stalk into kenaf stalk powder by a stalk crusher, mixing the kenaf stalk powder with carboxymethyl cellulose, glycerol, gelatin and water to prepare slurry, pulping and making paper mulching film; the weight parts of the raw materials are 34 parts of kenaf stalk powder, 9 parts of carboxymethyl cellulose, 5 parts of glycerol, 6 parts of gelatin and 46 parts of water;
(4) and (3) coating a layer of polyurethane on the surface of the lignin-starch composite film prepared in the step (2), covering the kenaf paper mulching film prepared in the step (3), and pressing and compounding to prepare the water-retaining environment-friendly lignin-starch-kenaf composite mulching film.
The test method was in accordance with example 1, and the data obtained are shown in Table 1.
Example 5
(1) Adding lignin into an aqueous solution of sodium sulfite, adding an oxidant, adjusting the pH value to 13, and heating for reaction to prepare sulfonated lignin; the oxidant is ferric sulfate; the heating reaction temperature is 128 ℃, and the time is 3 h; the raw materials comprise, by weight, 44 parts of lignin, 4 parts of sodium sulfite, 50 parts of water and 2 parts of an oxidant;
(2) gelatinizing starch microparticles, adding the starch microparticles into a polyvinyl alcohol solution, heating to 95 ℃, stirring until the starch microparticles are completely dissolved, then adding the sulfonated lignin prepared in the step (1), a cross-linking agent, a plasticizer, polyacrylamide, nano calcium carbonate and sodium dodecyl benzene sulfonate, stirring and mixing uniformly, and carrying out tape casting to form a film and drying to obtain a lignin-starch composite film; the mass concentration of the polyvinyl alcohol solution is 18 percent; the cross-linking agent is glyoxal; the plasticizer is triethanolamine; the raw materials comprise, by weight, 22 parts of gelatinized starch particles, 32 parts of polyvinyl alcohol solution, 2 parts of cross-linking agent, 2 parts of plasticizer, 23 parts of sulfonated lignin, 10 parts of polyacrylamide, 7 parts of nano calcium carbonate and 2 parts of sodium dodecyl benzene sulfonate;
(3) making kenaf stalk into kenaf stalk powder by a stalk crusher, mixing the kenaf stalk powder with carboxymethyl cellulose, glycerol, gelatin and water to prepare slurry, pulping and making paper mulching film; the weight parts of the raw materials are 35 parts of kenaf stalk powder, 11 parts of carboxymethyl cellulose, 7 parts of glycerol, 7 parts of gelatin and 40 parts of water;
(4) and (3) coating a layer of polyurethane on the surface of the lignin-starch composite film prepared in the step (2), covering the kenaf paper mulching film prepared in the step (3), and pressing and compounding to prepare the water-retaining environment-friendly lignin-starch-kenaf composite mulching film.
The test method was in accordance with example 1, and the data obtained are shown in Table 1.
Example 6
(1) Adding lignin into an aqueous solution of sodium sulfite, adding an oxidant, adjusting the pH value to 14, and heating for reaction to prepare sulfonated lignin; the oxidant is ferric bromide; the heating reaction temperature is 125 ℃, and the time is 3.5 h; the raw materials comprise, by weight, 42 parts of lignin, 4 parts of sodium sulfite, 52 parts of water and 2 parts of an oxidant;
(2) gelatinizing starch microparticles, adding the starch microparticles into a polyvinyl alcohol solution, heating to 94 ℃, stirring until the starch microparticles are completely dissolved, then adding the sulfonated lignin prepared in the step (1), a cross-linking agent, a plasticizer, polyacrylamide, nano calcium carbonate and sodium dodecyl benzene sulfonate, stirring and mixing uniformly, and carrying out tape casting to form a film and drying to obtain a lignin-starch composite film; the mass concentration of the polyvinyl alcohol solution is 18 percent; the cross-linking agent is succinaldehyde; the plasticizer is glycol; the raw materials comprise, by weight, 21 parts of gelatinized starch particles, 36 parts of polyvinyl alcohol solution, 2 parts of a cross-linking agent, 1 part of a plasticizer, 22 parts of sulfonated lignin, 10 parts of polyacrylamide, 7 parts of nano calcium carbonate and 1 part of sodium dodecyl benzene sulfonate;
(3) making kenaf stalk into kenaf stalk powder by a stalk crusher, mixing the kenaf stalk powder with carboxymethyl cellulose, glycerol, gelatin and water to prepare slurry, pulping and making paper mulching film; the weight parts of the raw materials are 34 parts of kenaf stalk powder, 10 parts of carboxymethyl cellulose, 6 parts of glycerol, 6 parts of gelatin and 44 parts of water;
(4) and (3) coating a layer of polyurethane on the surface of the lignin-starch composite film prepared in the step (2), covering the kenaf paper mulching film prepared in the step (3), and pressing and compounding to prepare the water-retaining environment-friendly lignin-starch-kenaf composite mulching film.
The test method was in accordance with example 1, and the data obtained are shown in Table 1.
Comparative example 1
During the preparation, no lignin was used and the other preparation conditions were identical to those of example 6.
The test method was in accordance with example 1, and the data obtained are shown in Table 1.
Table 1:
Claims (8)
1. the preparation method of the water-retaining environment-friendly lignin-starch-kenaf composite mulching film is characterized by comprising the following specific steps of:
(1) adding lignin into an aqueous solution of sodium sulfite, adding an oxidant, adjusting the pH value to 13-14, and heating for reaction to obtain sulfonated lignin;
(2) gelatinizing starch particles, adding the starch particles into a polyvinyl alcohol solution, heating to 92-96 ℃, stirring until the starch particles are completely dissolved, then adding the sulfonated lignin prepared in the step (1), a cross-linking agent, a plasticizer, polyacrylamide, nano calcium carbonate and sodium dodecyl benzene sulfonate, stirring and mixing uniformly, and carrying out tape casting to form a film and drying to obtain a lignin-starch composite film; the mass concentration of the polyvinyl alcohol solution is 15-20%; the raw materials comprise, by weight, 20-22 parts of gelatinized starch particles, 28-43 parts of a polyvinyl alcohol solution, 1-3 parts of a cross-linking agent, 1-2 parts of a plasticizer, 20-24 parts of sulfonated lignin, 8-11 parts of polyacrylamide, 6-8 parts of nano calcium carbonate and 1-2 parts of sodium dodecyl benzene sulfonate;
(3) making kenaf stalk into kenaf stalk powder by a stalk crusher, mixing the kenaf stalk powder with carboxymethyl cellulose, glycerol, gelatin and water to prepare slurry, pulping and making paper mulching film;
(4) and (3) coating a layer of polyurethane on the surface of the lignin-starch composite film prepared in the step (2), covering the kenaf paper mulching film prepared in the step (3), and pressing and compounding to prepare the water-retaining environment-friendly lignin-starch-kenaf composite mulching film.
2. The preparation method of the water-retaining environment-friendly lignin-starch-kenaf composite mulching film according to claim 1, characterized in that: and (2) the oxidant in the step (1) is at least one of ferric sulfate, ferric bromide, ferric chloride and ferric nitrate.
3. The preparation method of the water-retaining environment-friendly lignin-starch-kenaf composite mulching film according to claim 1, characterized in that: the heating reaction in the step (1) is carried out at the temperature of 120-130 ℃ for 3-4 h.
4. The preparation method of the water-retaining environment-friendly lignin-starch-kenaf composite mulching film according to claim 1, characterized in that: the raw materials in the step (1) comprise, by weight, 40-45 parts of lignin, 3-5 parts of sodium sulfite, 48-56 parts of water and 1-2 parts of an oxidant.
5. The preparation method of the water-retaining environment-friendly lignin-starch-kenaf composite mulching film according to claim 1, characterized in that: the cross-linking agent in the step (2) is at least one of formaldehyde, glyoxal and succinaldehyde.
6. The preparation method of the water-retaining environment-friendly lignin-starch-kenaf composite mulching film according to claim 1, characterized in that: and (3) the plasticizer in the step (2) is at least one of ethylene glycol, propylene glycol, isobutanol, isoprene glycol and triethanolamine.
7. The preparation method of the water-retaining environment-friendly lignin-starch-kenaf composite mulching film according to claim 1, characterized in that: the weight parts of the raw materials in the step (3) are 33-36 parts of kenaf stalk powder, 8-12 parts of carboxymethyl cellulose, 4-8 parts of glycerol, 5-8 parts of gelatin and 36-50 parts of water.
8. The water-retaining environment-friendly lignin-starch-kenaf composite mulching film prepared by the preparation method of any one of claims 1 to 7.
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| CN110878487A (en) * | 2019-11-25 | 2020-03-13 | 东华大学 | Method for preparing water-resistant environment-friendly bast fiber film by using carboxymethyl cellulose |
| CN111254741A (en) * | 2020-02-26 | 2020-06-09 | 上海昶法新材料有限公司 | Dry strength agent and preparation method and application thereof |
| CN114854217B (en) * | 2022-06-16 | 2023-05-09 | 陕西科技大学 | Biodegradable water-repellent ultraviolet-resistant gelatin-based bioplastic film and preparation method thereof |
| CN117362942B (en) * | 2023-09-26 | 2024-06-18 | 山东天一生物降解塑业有限公司 | Full-biodegradation water seepage mulching film special for dry farming agricultural area |
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