CN113308936A - Preparation method of natural mineral fiber/plant fiber degradable agricultural mulching film - Google Patents

Preparation method of natural mineral fiber/plant fiber degradable agricultural mulching film Download PDF

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CN113308936A
CN113308936A CN202110575720.0A CN202110575720A CN113308936A CN 113308936 A CN113308936 A CN 113308936A CN 202110575720 A CN202110575720 A CN 202110575720A CN 113308936 A CN113308936 A CN 113308936A
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fiber
fibers
mulching film
solution
plant
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CN113308936B (en
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缪应菊
吴红
连明磊
李琳
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Liupanshui Normal University
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H13/00—Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
    • D21H13/36—Inorganic fibres or flakes
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H13/00—Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
    • D21H13/36—Inorganic fibres or flakes
    • D21H13/38—Inorganic fibres or flakes siliceous
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/20—Macromolecular organic compounds
    • D21H17/21—Macromolecular organic compounds of natural origin; Derivatives thereof
    • D21H17/24—Polysaccharides
    • D21H17/25—Cellulose
    • D21H17/26—Ethers thereof
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/20—Macromolecular organic compounds
    • D21H17/33—Synthetic macromolecular compounds
    • D21H17/34—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H17/36—Polyalkenyalcohols; Polyalkenylethers; Polyalkenylesters
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/20—Macromolecular organic compounds
    • D21H17/33—Synthetic macromolecular compounds
    • D21H17/46—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H17/53—Polyethers; Polyesters
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/63—Inorganic compounds
    • D21H17/66—Salts, e.g. alums
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/10—Coatings without pigments
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/06—Paper forming aids
    • D21H21/08—Dispersing agents for fibres
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
    • Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
    • Y02A40/28—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture specially adapted for farming

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  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
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Abstract

The invention discloses a preparation method of a natural mineral fiber/plant fiber degradable agricultural mulching film, which is characterized in that natural mineral fibers are mixed with natural plant fibers after being subjected to surface modification to prepare the degradable agricultural composite mulching film by a wet papermaking process, raw materials used for preparing the agricultural mulching film are environment-friendly and biodegradable natural mineral fibers and plant fibers, the prepared agricultural film has the hardness and rigidity of the mineral fibers and the flexibility and toughness of the plant fibers, and the mechanical property of the agricultural film is improved by 15-50% compared with that of a pure plant fiber mulching film without the mineral fibers; the invention not only solves the production limitation of limited source and high cost of the raw materials of the degradable agricultural mulching film, but also can save the using amount of plant fibers and reduce the felling of forest trees.

Description

Preparation method of natural mineral fiber/plant fiber degradable agricultural mulching film
Technical Field
The invention belongs to the technical field of agricultural mulching films, and particularly relates to a degradable agricultural mulching film prepared by a wet papermaking process through compounding natural mineral fibers and plant fibers.
Background
The plastic mulching film is mainly made of Polyethylene (PE), polyvinyl chloride (PVC), polypropylene (PP) and other high-molecular compounds which are difficult to degrade, and after the plastic mulching film is used, residual mulching films can be reserved in the soil environment for 200-400 years, so that the soil ecosystem is damaged, and crop yield reduction is caused. Therefore, the development of degradable mulching films without toxic and side effects on the environment becomes a research hotspot in the field.
At present, degradable plastic mulching films can be divided into bio-based degradable plastic mulching films and petroleum-based degradable plastic mulching films according to raw materials. The bio-based degradable plastic mulching film is a plastic mulching film produced by taking biomass as a raw material, and mainly comprises polylactic acid (PLA), Polyhydroxyalkanoate (PHA), polyglutamic acid (PGA) and the like; the petroleum-based degradable plastic mulching film is produced by taking fossil energy as a raw material, and mainly comprises polybutylene succinate (PBS), polybutylene adipate/terephthalate (PBAT), Polycaprolactone (PCL) and the like. The bio-based plastic mulching film can reduce the consumption of traditional petrochemical energy sources such as petroleum and the like, but has high raw material cost; the petroleum-based plastic mulching film has low raw material cost, but depends on non-renewable petrochemical energy. The two film materials have limited reserves of raw material sources or high cost, so the application of the two film materials in the agricultural field is limited, and the development of the raw materials of the mulching film, which are cheap, easy to obtain, rich in sources and nontoxic to the environment, is a key way for preparing the agricultural mulching film.
The natural mineral fiber is novel inorganic environment-friendly green fiber prepared by taking natural inorganic minerals such as kaolin or clay, sepiolite, wollastonite, basalt and coal gangue as raw materials and carrying out processes such as high-temperature melting, filamentation and the like, and has the characteristics of no harm to the environment, biodegradability, good mechanical property and the like; the plant fiber is an inexhaustible renewable resource on the earth and has the characteristics of biodegradability, biocompatibility, safety and the like. At present, the production cost of natural mineral fibers is generally 2000 yuan/ton, only 30% -50% of wood pulp fibers are used, the price of products is low, the source of raw materials is rich, the preparation of the mulching film is carried out by adopting a wet papermaking process of compounding the natural mineral fibers and the plant fibers, the hardness and the rigidity of the mineral fibers and the flexibility and the toughness of the plant fibers can be achieved, the production limitation that the source of the raw materials of the degradable mulching film is limited and the cost is high can be solved, meanwhile, the consumption of the plant fibers can be saved, and the felling of forest trees can be reduced.
Disclosure of Invention
The invention aims to provide a preparation method of a natural mineral fiber/plant fiber degradable agricultural mulching film.
The method comprises the following specific steps:
(1) cutting the natural mineral fibers into short fibers with the diameter of 0.5-5 mm;
the natural mineral fiber is one or more of aluminum silicate fiber, sepiolite fiber, wollastonite fiber, basalt fiber and coal gangue fiber;
(2) sequentially carrying out ultrasonic treatment on the natural mineral short fibers in the step (1) for 60-120 min by adopting alkali liquor and acid liquor at 40-80 ℃ to carry out surface modification, wherein the mass ratio of the absolutely dry short fibers to the alkali liquor or the acid liquor is 1: 10-1: 50;
the alkali liquor is a sodium hydroxide solution and/or a potassium hydroxide solution, and the concentration of the alkali liquor is 0.5-3 mol/L; the acid solution is one or more of hydrochloric acid solution, sulfuric acid solution, nitric acid solution, phosphoric acid solution, formic acid solution, acetic acid solution, propionic acid solution and oxalic acid solution, and the concentration of the acid solution is 0.5-2.5 mol/L;
the ultrasonic frequency is 45-100 kHz, and the ultrasonic power is 240-600W;
(3) adding the modified mineral fibers obtained in the step (2) into a dispersant solution with the mass concentration of 0.1-1.2%, and mechanically stirring for 30-120 min at 30-60 ℃ to obtain a uniformly dispersed mineral fiber dispersion liquid, wherein the mass ratio of the oven-dried modified mineral fibers to the dispersant solution is 1: 20-1: 80;
the dispersing agent is one or more of sodium polyphosphate, diammonium hydrogen phosphate, sodium pyrophosphate and sodium tetraphosphate;
(4) chopping the plant fiber pulp board into pieces, putting the pieces into a sodium hydroxide-urea aqueous solution with the solid content of 4-16% for treatment for 6-24 h according to the absolute dry piece ratio, taking out the pieces, and adding the pieces into (NH) with the mass concentration of 1-9%4)2SO4Mechanically stirring the solution at 1500rpm for 15-40 min, carrying out solid-liquid separation, and washing the solid to be neutral;
the sodium hydroxide-urea aqueous solution composition comprises 1% of sodium hydroxide, 8% of urea and 91% of water by mass percent;
the plant fiber is one or more of wood pulp, straw pulp, hemp pulp, reed pulp, cotton pulp, cane pulp, bamboo pulp, rag pulp and waste paper pulp;
(5) putting the washed paper pulp fibers obtained in the step (4) into water according to the solid content of 0.5-3% by weight of the absolutely dry paper pulp fibers, and mechanically stirring at 2000-3000 rpm for 20-40 min to perform fiber dissociation to obtain a plant fiber solution;
(6) adding the mineral fiber dispersion liquid obtained in the step (3) into the plant fiber solution obtained in the step (5) under the condition of mechanical stirring, adding an adhesive, and mechanically stirring for 10-30 min at 40-60 ℃, wherein the absolute dry mineral fibers account for 5-30% of the total mass of the absolute dry mineral fibers and the absolute dry plant fibers, and the addition amount of the adhesive is 2-16% of the total mass of the absolute dry mineral fibers and the absolute dry plant fibers;
the adhesive is one or more of polyvinyl alcohol, polyoxyethylene, hydroxypropyl methyl cellulose, methyl cellulose and methyl cellulose;
(7) and (3) adopting a wet papermaking process, forming the mixed fiber solution obtained in the step (6) on a standard paper sheet former, spraying a polyvinyl alcohol aqueous solution with the mass concentration of 1-4%, standing for 10-15 min, spraying a rosin ethanol solution with the mass concentration of 0.3-1.5%, and hot-pressing and drying at 95 ℃ for 5min to obtain the natural mineral fiber/plant fiber degradable agricultural mulching film.
The method has the advantages and the technical effects that:
the natural mineral fiber raw material has rich sources, no toxicity, low production cost (usually only 30-50% of wood pulp fiber), and the mulching film prepared by compounding the mineral fiber and the plant fiber has the hardness and rigidity of the mineral fiber and the flexibility and toughness of the plant fiber, and the mechanical property of the mulching film is improved by 15-50% compared with that of a pure plant fiber mulching film without the mineral fiber; the degradable mulching film is non-toxic and biodegradable, does not need film recovery, not only solves the production limitation of limited source of raw materials and high cost of the degradable mulching film, but also can save the using amount of plant fibers and reduce the felling of forest trees.
Detailed Description
The present invention is further illustrated by the following examples, which are not intended to limit the scope of the invention
Comparative example: the preparation method of the paper mulching film without adding the natural mineral fibers comprises the following specific operations:
(1) chopping commercially available eucalyptus pulp into pieces of 0.3X 1cm2The pieces of (1) are treated for 12 hours in sodium hydroxide-urea aqueous solution (sodium hydroxide 1%, urea 8%, water 91%) pre-cooled to 0 ℃ in a proportion of 10% of solid content in terms of oven-dried pieces, and the plant fibers are taken out and added to 200mL of (NH) with a mass concentration of 7% at room temperature4)2SO4Mechanically stirring the solution at 1500rpm for 15min, performing solid-liquid separation, and washing the solid water to be neutral;
(2) putting the washed pulp fiber into water according to the proportion of 3 percent of solid content (calculated by absolute dry pulp fiber), and mechanically stirring at 2000rpm for 20min to perform fiber dissociation to obtain a plant fiber solution;
(3) and (2) adopting a wet papermaking process, forming the plant fiber solution on a standard paper sheet former, spraying a polyvinyl alcohol aqueous solution with the mass concentration of 1%, standing for 10min, spraying a 0.5% rosin ethanol solution, and carrying out hot-pressing drying at 95 ℃ for 5min to obtain the plant fiber degradable agricultural mulching film.
The performance parameters of the composite mulching film are as follows:
quantitative/(g.m)-2)：62
Thickness/(mm): 0.13
Tensile index/(N.m.g)-1)：23.52
Tear index/(mN. m)2.g-1）：3.58
Burst index/(kPa. m)2.g-1)：0.96
Folding strength/fold: 8.2.
example 1: the preparation method of the natural mineral fiber/plant fiber degradable agricultural mulching film comprises the following steps:
(1) cutting basalt fibers into short fibers with the diameter of 0.5 mm;
(2) respectively treating the short fibers in the step (1) by using a sodium hydroxide solution with the concentration of 1mol/L and an oxalic acid solution with the concentration of 1.5mol/L for 60min at 60 ℃ by using ultrasound of 80kHz and 400W to perform surface modification, wherein the mass ratio of the oven-dried short fibers to the sodium hydroxide solution or the oxalic acid solution is 1: 20;
(3) adding the modified mineral fibers obtained in the step (2) into a sodium polyphosphate solution with the mass concentration of 0.5%, and mechanically stirring for 120min at 40 ℃ to obtain a uniformly dispersed mineral fiber dispersion liquid, wherein the mass ratio of oven-dried modified fibers to a dispersant solution is 1: 60;
(4) chopping commercially available eucalyptus pulp into pieces of 0.3X 1cm2The pieces are put into sodium hydroxide-urea aqueous solution (1 percent of sodium hydroxide, 8 percent of urea and 91 percent of water) which is precooled to 0 ℃ according to the proportion that the solid content is 6 percent (calculated by absolute dry eucalyptus pieces), treated for 24 hours, taken out and added with 200mL of (NH) with the mass concentration of 7 percent at room temperature4)2SO4Mechanically stirring the solution at 1500rpm for 40min, performing solid-liquid separation, and washing the solid water to be neutral;
(5) putting the pulp fiber washed in the step (4) into water with the solid content of 0.5% (calculated by absolute dry pulp fiber), and mechanically stirring at 3000rpm for 40min to perform fiber dissociation to obtain a plant fiber solution;
(6) adding the mineral fiber dispersion liquid obtained in the step (3) into the plant fiber solution obtained in the step (5) under the condition of mechanical stirring at 3000rpm, adding polyvinyl alcohol, and continuing stirring for 30min at 50 ℃, wherein the oven-dried mineral fibers account for 5% of the total mass of the oven-dried mineral fibers and the oven-dried plant fibers, and the addition amount of the adhesive is 8% of the total mass of the oven-dried mineral fibers and the oven-dried plant fibers;
(7) and (3) adopting a wet papermaking process, forming the mixed fiber obtained in the step (6) on a standard paper sheet former, spraying a polyvinyl alcohol aqueous solution with the mass concentration of 4%, standing for 15min, spraying a 0.8% rosin ethanol solution, and carrying out hot-pressing drying at 95 ℃ for 5min to obtain the mineral fiber/plant fiber compound degradable agricultural mulching film.
The performance and yield parameters of the composite mulching film are as follows:
quantitative/(g.m)-2)：62
Thickness/(mm): 0.14
Tensile index/(N.m.g)-1)：30.59
Tear index/(mN. m)2.g-1）：4.30
Burst index/(kPa. m)2.g-1)：1.20
Folding strength/fold: 9.02.
example 2: the preparation method of the natural mineral fiber/plant fiber degradable agricultural mulching film comprises the following steps:
(1) cutting the aluminum silicate fiber into short fibers with the diameter of 1 mm;
(2) respectively treating the short fibers with 0.5mol/L potassium hydroxide solution and 0.5mol/L hydrochloric acid solution at 40 ℃ for 120min by using 80kHz and 600W ultrasonic waves to perform surface modification, wherein the mass ratio of the oven-dried short fibers to the potassium hydroxide solution or the hydrochloric acid solution is 1: 40;
(3) adding the modified mineral fibers obtained in the step (2) into a diammonium hydrogen phosphate solution with the mass concentration of 1.0%, and mechanically stirring at 60 ℃ for 60min to obtain a uniformly dispersed mineral fiber dispersion liquid, wherein the mass ratio of the oven-dried modified mineral fibers to the dispersant solution is 1: 80;
(4) chopping commercially available pinus sylvestris pulp into pieces of 0.3X 1cm2The chips are put into sodium hydroxide-urea aqueous solution (1 percent of sodium hydroxide, 8 percent of urea and 91 percent of water) which is pre-cooled to-5 ℃ according to the proportion of solid content of 10 percent (calculated by absolute dry pinus khasys chips) for treatment for 12 hours, and 400mL of (NH) with the mass concentration of 7 percent is added into pinus khasys fibers taken out at room temperature4)2SO4Mechanically stirring the solution at 1500rpm for 40min, performing solid-liquid separation, and washing the solid water to be neutral;
(5) putting the pulp fiber washed in the step (4) into water with the solid content of 1.5% (calculated on the absolute dry pulp fiber), and mechanically stirring at 3000rpm for 30min to perform fiber dissociation to obtain a plant fiber solution;
(6) adding the mineral fiber dispersion liquid obtained in the step (3) into the plant fiber solution obtained in the step (5) under the condition of mechanical stirring at 3000rpm, adding polyoxyethylene, and continuing stirring for 20min at 40 ℃, wherein the oven-dried mineral fibers account for 12% of the total mass of the oven-dried mineral fibers and the oven-dried plant fibers, and the addition amount of the adhesive is 10% of the total mass of the oven-dried mineral fibers and the oven-dried plant fibers;
(7) and (3) adopting a wet papermaking process, forming the mixed fiber obtained in the step (6) on a standard paper sheet former, spraying a polyvinyl alcohol aqueous solution with the mass concentration of 3.5%, standing for 12 min, spraying a rosin ethanol solution with the mass concentration of 1.5%, and carrying out hot-pressing drying at 95 ℃ for 5min to obtain the mineral fiber/plant fiber compound degradable agricultural mulching film.
The performance and yield parameters of the composite mulching film are as follows:
quantitative/(g.m)-2)：63
Thickness/(mm): 0.15
Tensile index/(N.m.g)-1)：29.40
Tear index/(mN. m)2.g-1）：4.83
Burst index/(kPa. m)2.g-1)：1.25
Folding strength/fold: 10.25.
example 3: the preparation method of the natural mineral fiber/plant fiber degradable agricultural mulching film comprises the following steps:
(1) cutting sepiolite fibers into short fibers of 3 mm;
(2) respectively treating the short fibers with 1.0 mol/L sodium hydroxide solution and 0.5mol/L sulfuric acid solution at 80 ℃ for 70min by adopting 80kHz and 300W ultrasonic waves in sequence to carry out surface modification, wherein the mass ratio of the oven-dried short fibers to the sodium hydroxide solution or the sulfuric acid solution is 1: 30;
(3) adding the modified mineral fibers obtained in the step (2) into a sodium pyrophosphate solution with the mass concentration of 1.2%, and mechanically stirring at 60 ℃ for 35min to obtain a uniformly dispersed mineral fiber dispersion liquid, wherein the mass ratio of the oven-dried modified mineral fibers to the dispersant solution is 1: 30;
(4) chopping commercially available wheat straw pulp into 0.3X 1cm pieces2The chips are put into sodium hydroxide-urea aqueous solution (1 percent of sodium hydroxide, 8 percent of urea and 91 percent of water) which is precooled to-10 ℃ for treatment for 24 hours according to the proportion of solid content of 12 percent (calculated by absolute dry wheat straw chips), the fibers are taken out and added with 300mL of (NH) with the mass concentration of 9 percent at room temperature4)2SO4Mechanically stirring the solution at 1500rpm for 20min, performing solid-liquid separation, and washing the solid water to be neutral;
(5) putting the pulp fiber washed in the step (4) into water with the solid content of 2% (calculated on the absolute dry pulp fiber), and mechanically stirring at 2500rpm for 20min to perform fiber dissociation to obtain a plant fiber solution;
(6) adding the mineral fiber dispersion liquid obtained in the step (3) into the plant fiber solution obtained in the step (5) under the mechanical stirring condition of 3000rpm, adding hydroxypropyl methyl cellulose, and continuing stirring for 20min at the temperature of 60 ℃, wherein the oven-dried mineral fibers account for 10% of the total mass of the oven-dried mineral fibers and the oven-dried plant fibers, and the addition amount of the adhesive is 4% of the total mass of the oven-dried mineral fibers and the oven-dried plant fibers;
(7) adopting a wet papermaking process, forming the mixed fiber obtained in the step (6) on a standard paper sheet former, spraying a polyvinyl alcohol aqueous solution with the mass concentration of 2%, standing for 10min, spraying a 1.2% rosin ethanol solution, and carrying out hot-pressing drying at 95 ℃ for 5min to obtain the mineral fiber/plant fiber compound degradable agricultural mulching film;
the performance and yield parameters of the composite mulching film are as follows:
quantitative/(g.m)-2)：61
Thickness/(mm): 0.13
Tensile index/(N.m.g)-1)：27.05
Tear index/(mN. m)2.g-1）：5.01
Burst index/(kPa. m)2.g-1)：1.25
Folding strength/fold: 9.43.
example 4: the preparation method of the natural mineral fiber/plant fiber degradable agricultural mulching film comprises the following steps:
(1) cutting wollastonite fiber into 5mm short fiber;
(2) respectively treating the short fibers with 3mol/L potassium hydroxide solution and 0.5mol/L nitric acid solution at 50 ℃ for 80min by using 100kHz and 600W ultrasonic waves to perform surface modification, wherein the mass ratio of the absolutely dry short fibers to alkali liquor or acid liquor is 1: 50;
(3) adding the modified mineral fibers obtained in the step (2) into a solution of sodium tetraphosphate with the mass concentration of 1.1%, and mechanically stirring for 70min at 30 ℃ to obtain a uniformly dispersed mineral fiber dispersion liquid, wherein the mass ratio of the oven-dried modified mineral fibers to the dispersant solution is 1: 40;
(4) chopping commercially available Chinese alpine rush pulp into pieces of 0.3X 1cm2The fragments are put into sodium hydroxide-urea aqueous solution (1 percent of sodium hydroxide, 8 percent of urea and 91 percent of water) which is precooled to 0 ℃ for treatment for 10 hours according to the proportion that the solid content is 4 percent (calculated by absolutely dry Chinese alpine rush fragments), the fibers are taken out and added into 400mL of (NH) with the mass concentration of 8 percent at room temperature4)2SO4Mechanically stirring the solution at 1500rpm for 20min, performing solid-liquid separation, and washing the solid water to be neutral;
(5) putting the pulp fiber washed in the step (4) into water with the solid content of 0.5% (calculated by absolute dry pulp fiber), and mechanically stirring at 2000rpm for 20min to perform fiber dissociation to obtain a plant fiber solution;
(6) adding the mineral fiber dispersion liquid obtained in the step (3) into the plant fiber solution obtained in the step (5) under the mechanical stirring condition of 3000rpm, adding the methyl cellulose, and continuing stirring for 30min at the temperature of 40 ℃, wherein the oven-dried mineral fibers account for 12% of the total mass of the oven-dried mineral fibers and the oven-dried plant fibers, and the addition amount of the adhesive is 14% of the total mass of the oven-dried mineral fibers and the oven-dried plant fibers;
(7) adopting a wet papermaking process, forming the mixed fiber obtained in the step (6) on a standard paper sheet former, spraying a polyvinyl alcohol aqueous solution with the mass concentration of 1%, standing for 15min, spraying a rosin ethanol solution with the mass concentration of 1.5%, and carrying out hot-pressing drying at 95 ℃ for 5min to obtain the mineral fiber/plant fiber compound degradable agricultural mulching film;
the performance and yield parameters of the composite mulching film are as follows:
quantitative/(g.m)-2)：62
Thickness/(mm): 0.14
Tensile index/(N.m.g)-1)：34.12
Tear index/(mN. m)2.g-1）：4.65
Burst index/(kPa. m)2.g-1)：1.10
Folding strength/fold: 9.84.
example 5: the preparation method of the natural mineral fiber/plant fiber degradable agricultural mulching film comprises the following steps:
(1) cutting coal gangue fiber into short fiber with the length of 4 mm;
(2) respectively treating the short fibers with 2.5mol/L sodium hydroxide solution and 1mol/L phosphoric acid solution at 4 ℃ for 120min by using 100kHz and 400W ultrasonic waves to perform surface modification, wherein the mass ratio of the absolutely dry short fibers to alkali liquor or acid liquor is 1: 45;
(3) adding the modified mineral fibers obtained in the step (2) into a solution of sodium polyphosphate and diammonium hydrogen phosphate (mass ratio is 1: 1) with the mass concentration of 0.1%, and mechanically stirring for 55min at 60 ℃ to obtain a uniformly dispersed mineral fiber dispersion liquid, wherein the mass ratio of the oven-dried modified mineral fibers to the dispersant solution is 1: 50;
(4) chopping commercially available straw pulp into pieces of 0.3X 1cm2The pieces of (1) were treated with an aqueous solution of sodium hydroxide-urea (1% sodium hydroxide, 8% urea, 91% water) pre-cooled to-10 ℃ for 10 hours at a solid content of 16% (based on the absolutely dry straw pieces), and the straw fibers were taken out and added to 400mL of (NH) having a mass concentration of 6% (NH) at room temperature4)2SO4Mechanically stirring the solution at 1500rpm for 4 min, performing solid-liquid separation, and washing the solid water to be neutral;
(5) putting the paper pulp fiber washed in the step (4) into water with the solid content of 3% (calculated by absolute dry paper pulp fiber), and mechanically stirring at 3000rpm for 40min to perform fiber dissociation to obtain a plant fiber solution;
(6) adding the mineral fiber dispersion liquid obtained in the step (3) into the plant fiber solution obtained in the step (5) under the mechanical stirring condition of 3000rpm, adding methyl cellulose, and continuing stirring for 10min at the temperature of 60 ℃, wherein the oven-dried mineral fibers account for 5% of the total mass of the oven-dried mineral fibers and the oven-dried plant fibers, and the addition amount of the adhesive is 8% of the total mass of the oven-dried mineral fibers and the oven-dried plant fibers;
(7) adopting a wet papermaking process, forming the mixed fiber obtained in the step (6) on a standard paper sheet former, spraying a polyvinyl alcohol aqueous solution with the mass concentration of 4%, standing for 10min, spraying a 0.3% rosin ethanol solution, and carrying out hot-pressing drying at 95 ℃ for 5min to obtain the mineral fiber/plant fiber compound degradable agricultural mulching film;
the performance and yield parameters of the composite mulching film are as follows:
quantitative/(g.m)-2)：61
Thickness/(mm): 0.12
Tensile index/(N.m.g)-1)：28.22
Tear index/(mN. m)2.g-1）：5.37
Burst index/(kPa. m)2.g-1)：1.34
Folding strength/fold: 9.84.
example 6: the preparation method of the natural mineral fiber/plant fiber degradable agricultural mulching film comprises the following steps:
(1) cutting wollastonite fiber into short fiber of 2 mm;
(2) respectively treating the short fibers with 0.5mol/L potassium hydroxide solution and 2.5mol/L formic acid solution at 70 ℃ for 80min by using 100kHz and 300W ultrasonic waves to perform surface modification, wherein the mass ratio of the absolutely dry short fibers to alkali liquor or acid liquor is 1: 35;
(3) adding the modified mineral fibers obtained in the step (2) into a solution of diammonium hydrogen phosphate and sodium pyrophosphate (mass ratio of 1: 1) with the mass concentration of 0.9%, and mechanically stirring for 40min at 40 ℃ to obtain a uniformly dispersed mineral fiber dispersion liquid, wherein the mass ratio of the oven-dried modified mineral fibers to the dispersant solution is 1: 30;
(4) chopping commercially available bamboo pulp into 0.3 × 1cm2The fragments are put into sodium hydroxide-urea aqueous solution (1 percent of sodium hydroxide, 8 percent of urea and 91 percent of water) which is precooled to-5 ℃ for treatment for 15h according to the proportion that the solid content is 14 percent (calculated by absolute dry bamboo fragments), the bamboo fibers are taken out and added into 300mL of (NH) with the mass concentration of 1 percent at room temperature4)2SO4Mechanically stirring the solution at 1500rpm for 15min, performing solid-liquid separation, and washing the solid water to be neutral;
(5) putting the paper pulp fiber washed in the step (4) into water with the solid content of 1% (calculated on the absolute dry paper pulp fiber), and mechanically stirring at 2000rpm for 25min to perform fiber dissociation to obtain a plant fiber solution;
(6) adding the mineral fiber dispersion liquid obtained in the step (3) into the plant fiber solution obtained in the step (5) under the condition of mechanical stirring at 3000rpm, adding polyoxyethylene, and continuing stirring for 20min at 50 ℃, wherein the oven-dried mineral fibers account for 20% of the total mass of the oven-dried mineral fibers and the oven-dried plant fibers, and the addition amount of the adhesive is 6% of the total mass of the oven-dried mineral fibers and the oven-dried plant fibers;
(7) adopting a wet papermaking process, forming the mixed fiber obtained in the step (6) on a standard paper sheet former, spraying a polyvinyl alcohol aqueous solution with the mass concentration of 3.5%, standing for 12 min, spraying a rosin ethanol solution with the mass concentration of 1.0%, and carrying out hot-pressing drying at 95 ℃ for 5min to obtain the mineral fiber/plant fiber compound degradable agricultural mulching film;
the performance and yield parameters of the composite mulching film are as follows:
quantitative/(g.m)-2)：62
Thickness/(mm): 0.13
Tensile index/(N.m.g)-1)：35.30
Tear index/(mN. m)2.g-1）：4.12
Burst index/(kPa. m)2.g-1)：1.20
Folding strength/fold: 11.48.
example 7: the preparation method of the natural mineral fiber/plant fiber degradable agricultural mulching film comprises the following steps:
(1) cutting basalt fibers into short fibers with the diameter of 3.5 mm;
(2) respectively treating the short fibers with 2.5mol/L sodium hydroxide solution and 0.5mol/L acetic acid solution at 50 ℃ for 100min by adopting 45kHz and 240W ultrasonic waves to carry out surface modification, wherein the mass ratio of the absolutely dry short fibers to alkali liquor or acid liquor is 1: 30;
(3) adding modified mineral fibers into a diammonium hydrogen phosphate solution with the mass concentration of 0.5%, and mechanically stirring for 100min at 30 ℃ to obtain a uniformly dispersed mineral fiber dispersion liquid, wherein the mass ratio of the oven-dried modified mineral fibers to the dispersant solution is 1: 70;
(4) chopping commercially available eucalyptus pulp sheet and pinus sylvestris pulp sheet into 0.3 × 1cm pieces2The fragments are uniformly mixed according to the mass ratio of 91:9, the fragments are put into sodium hydroxide-urea aqueous solution (1 percent of sodium hydroxide, 8 percent of urea and 91 percent of water) which is precooled to 0 ℃ according to the proportion of 10 percent of solid content (calculated by absolute dry fragments) for treatment for 18 hours, the fibers are taken out and added with 200mL of (NH) with the mass concentration of 2 percent at room temperature4)2SO4Mechanically stirring the solution at 1500rpm for 20min, performing solid-liquid separation, and washing the solid water to be neutral;
(5) putting the pulp fiber washed in the step (4) into water with the solid content of 2.5% (calculated on the absolute dry pulp fiber), and mechanically stirring at 3000rpm for 35min to perform fiber dissociation to obtain a plant fiber solution;
(6) adding the mineral fiber dispersion liquid obtained in the step (3) into the plant fiber solution obtained in the step (5) under the condition of mechanical stirring at 3000rpm, adding hydroxypropyl methyl cellulose, and continuing stirring for 10min at 55 ℃, wherein the oven-dried mineral fibers account for 15% of the total mass of the oven-dried mineral fibers and the oven-dried plant fibers, and the addition amount of the adhesive is 16% of the total mass of the oven-dried mineral fibers and the oven-dried plant fibers;
(7) adopting a wet papermaking process, forming the mixed fiber obtained in the step (6) on a standard paper sheet former, spraying a polyvinyl alcohol aqueous solution with the mass concentration of 4%, standing for 10min, spraying a 0.5% rosin ethanol solution, and carrying out hot-pressing drying at 95 ℃ for 5min to obtain the mineral fiber/plant fiber compound degradable agricultural mulching film;
the performance and yield parameters of the composite mulching film are as follows:
quantitative/(g.m)-2)：65
Thickness/(mm): 0.15
Tensile index/(N.m.g)-1)：30.59
Tear index/(mN. m)2.g-1）：4.48
Burst index/(kPa. m)2.g-1)：1.44
Folding strength/fold: 11.48.
example 8: the preparation method of the natural mineral fiber/plant fiber degradable agricultural mulching film comprises the following steps
(1) Cutting the coal gangue fiber into short fibers with the diameter of 2.5 mm;
(2) respectively treating the short fibers with 0.5mol/L potassium hydroxide solution and 2mol/L propionic acid solution at 70 ℃ for 90min by adopting 45kHz and 360W ultrasonic waves to perform surface modification, wherein the mass ratio of the absolutely dry short fibers to alkali liquor or acid liquor is 1: 40;
(3) adding the modified mineral fibers obtained in the step (2) into a sodium polyphosphate solution with the mass concentration of 0.3%, and mechanically stirring for 30min at 50 ℃ to obtain a uniformly dispersed mineral fiber dispersion liquid, wherein the mass ratio of the oven-dried modified mineral fibers to the dispersant solution is 1: 40;
(4) cutting mixed waste paper into 0.3 × 1cm2The fragments are put into sodium hydroxide-urea aqueous solution (1 percent of sodium hydroxide, 8 percent of urea and 91 percent of water) which is precooled to-5 ℃ for treatment for 6 hours according to the proportion of 8 percent of solid content (calculated by absolute dry crushed waste paper sheets), and the fibers are taken out and added into 300mL of (NH) with the mass concentration of 4 percent at room temperature4)2SO4Mechanically stirring the solution at 1500rpm for 30min, performing solid-liquid separation, and washing the solid water to be neutral;
(5) putting the paper pulp fiber washed in the step (4) into water with the solid content of 0.5 percent (calculated by absolute dry paper pulp fiber), and mechanically stirring at 2500rpm for 30min to perform fiber dissociation to obtain a plant fiber solution;
(6) adding the mineral fiber dispersion liquid obtained in the step (3) into the plant fiber solution obtained in the step (5) under the mechanical stirring condition of 3000rpm, adding the methyl cellulose, and continuing stirring for 30min at the temperature of 40 ℃, wherein the oven-dried mineral fibers account for 25% of the total mass of the oven-dried mineral fibers and the oven-dried plant fibers, and the addition amount of the adhesive is 12% of the total mass of the oven-dried mineral fibers and the oven-dried plant fibers;
(7) adopting a wet papermaking process, forming the mixed fiber obtained in the step (6) on a standard paper sheet former, spraying a polyvinyl alcohol aqueous solution with the mass concentration of 3%, standing for 12 min, spraying a 0.7% rosin ethanol solution, and carrying out hot-pressing drying at 95 ℃ for 5min to obtain the mineral fiber/plant fiber compound degradable agricultural mulching film;
the performance and yield parameters of the composite mulching film are as follows:
quantitative/(g.m)-2)：63
Thickness/(mm): 0.15
Tensile index/(N.m.g)-1)：32.93
Tear index/(mN. m)2.g-1）：5.19
Burst index/(kPa. m)2.g-1)：1.15
Folding strength/fold: 11.07.
example 9: the preparation method of the natural mineral fiber/plant fiber degradable agricultural mulching film comprises the following steps:
(1) cutting basalt fibers and coal gangue fibers into short fibers with the diameter of 1.5 mm, and uniformly mixing the short fibers and the coal gangue fibers according to the mass ratio of 1: 1;
(2) respectively treating the short fibers with 2mol/L sodium hydroxide solution and 2mol/L oxalic acid solution at 80 ℃ for 90min by adopting 45kHz and 600W ultrasonic waves to perform surface modification, wherein the mass ratio of the absolutely dry short fibers to alkali liquor or acid liquor is 1: 15;
(3) adding modified mineral fibers into a solution of sodium pyrophosphate with the mass concentration of 0.7%, and mechanically stirring for 50min at 50 ℃ to obtain a uniformly dispersed mineral fiber dispersion liquid, wherein the mass ratio of the oven-dried modified mineral fibers to the dispersant solution is 1: 20;
(4) chopping commercial bagasse pulp into 0.3X 1cm2The chips are put into sodium hydroxide-urea aqueous solution (1 percent of sodium hydroxide, 8 percent of urea and 91 percent of water) which is precooled to-10 ℃ for treatment for 18 hours according to the proportion that the solid content is 14 percent (calculated by absolute dry bagasse), the fibers are taken out and added with 200mL of (NH) with the mass concentration of 3 percent at room temperature4)2SO4Mechanically stirring the solution at 1500rpm for 35min, performing solid-liquid separation, and washing the solid water to be neutral;
(5) putting the pretreated wet pulp fiber in the step (4) into water with the solid content of 2% (calculated by absolute dry fiber), and mechanically stirring at 3000rpm for 40min to perform fiber dissociation to obtain a plant fiber solution;
(6) adding the mineral fiber dispersion liquid obtained in the step (3) into the plant fiber solution obtained in the step (5) under the mechanical stirring condition of 3000rpm, adding methylcellulose, and continuing stirring at 50 ℃ for 20min, wherein the oven-dried mineral fibers account for 30% of the total mass of the oven-dried mineral fibers and the oven-dried plant fibers, and the addition amount of the adhesive is 12% of the total mass of the oven-dried mineral fibers and the oven-dried plant fibers;
(7) adopting a wet papermaking process, forming the mixed fiber obtained in the step (6) on a standard paper sheet former, spraying a polyvinyl alcohol aqueous solution with the mass concentration of 2%, standing for 15min, spraying a 1.0% rosin ethanol solution, and carrying out hot-pressing drying at 95 ℃ for 5min to obtain the mineral fiber/plant fiber compound degradable agricultural mulching film;
the performance and yield parameters of the composite mulching film are as follows:
quantitative/(g.m)-2)：63
Thickness/(mm): 0.14
Tensile index/(N.m.g)-1)：31.75
Tear index/(mN. m)2.g-1）：5.19
Burst index/(kPa. m)2.g-1)：1.30
Folding strength/fold: 12.30.
example 10: the preparation method of the natural mineral fiber/plant fiber degradable agricultural mulching film comprises the following steps:
(1) cutting the sepiolite fibers and the basalt fibers into short fibers with the length of 4.5mm, and uniformly mixing the short fibers and the basalt fibers according to the mass ratio of 1: 1;
(2) respectively treating the short fibers with 1mol/L sodium hydroxide solution and 1.5mol/L hydrochloric acid solution at 60 ℃ for 100min by using 80kHz and 600W ultrasonic waves to perform surface modification, wherein the mass ratio of the absolutely dry short fibers to alkali liquor or acid liquor is 1: 25;
(3) adding modified mineral fibers into a 0.8% sodium tetraphosphate solution, and mechanically stirring at 60 ℃ for 90min to obtain a uniformly dispersed mineral fiber dispersion solution, wherein the mass ratio of oven-dried modified mineral fibers to a dispersant solution is 1: 30;
(4) chopping commercially available eucalyptus pulp board and cotton linter pulp board to 0.3 × 1cm2Uniformly mixing the fragments according to a mass ratio of 88:12, putting the fragments into a sodium hydroxide-urea aqueous solution (1 percent of sodium hydroxide, 8 percent of urea and 91 percent of water) which is precooled to-5 ℃ according to a solid content ratio of 8 percent (calculated by absolute dry fragments) for treatment for 18 hours, taking out fibers, adding 300mL of (NH) with a mass concentration of 5 percent at room temperature4)2SO4In solutionMechanically stirring at 1500rpm for 30min, performing solid-liquid separation, and washing the solid water to be neutral;
(5) putting the paper pulp fiber washed in the step (4) into water with the solid content of 1.5% (calculated by absolute dry paper pulp fiber), and mechanically stirring at 2500rpm for 30min to perform fiber dissociation to obtain a plant fiber solution;
(6) adding the mineral fiber dispersion liquid obtained in the step (3) into the plant fiber solution obtained in the step (5) under the mechanical stirring condition of 3000rpm, adding polyvinyl alcohol, and continuing stirring for 30min at 40 ℃, wherein the oven-dried mineral fibers account for 10% of the total mass of the oven-dried mineral fibers and the oven-dried plant fibers, and the addition amount of the adhesive is 10% of the total mass of the oven-dried mineral fibers and the oven-dried plant fibers;
(7) adopting a wet papermaking process, forming the mixed fiber obtained in the step (6) on a standard paper sheet former, spraying a polyvinyl alcohol aqueous solution with the mass concentration of 2.5%, standing for 15min, spraying a rosin ethanol solution with the mass concentration of 1.2%, and carrying out hot-pressing drying at 95 ℃ for 5min to obtain the mineral fiber/plant fiber compound degradable agricultural mulching film;
the performance and yield parameters of the composite mulching film are as follows:
quantitative/(g.m)-2)：63
Thickness/(mm): 0.13
Tensile index/(N.m.g)-1)：34.10
Tear index/(mN. m)2.g-1）：4.65
Burst index/(kPa. m)2.g-1)：1.30
Folding strength/fold: 11.89.
the above list is only the specific embodiment of the present invention, it is obvious that the present invention is not limited to the above embodiment, and many variations are possible. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (7)

1. A preparation method of a natural mineral fiber/plant fiber degradable agricultural mulching film is characterized by comprising the following specific steps:
(1) cutting the natural mineral fibers into short fibers with the diameter of 0.5-5 mm;
(2) sequentially carrying out ultrasonic treatment on the natural mineral short fibers in the step (1) for 60-120 min by using alkali liquor and acid liquor at 40-80 ℃ to carry out surface modification, wherein the mass ratio of the absolutely dry short fibers to the alkali liquor or the acid liquor is 1: 10-1: 50;
(3) adding the modified mineral fibers obtained in the step (2) into a dispersant solution with the mass concentration of 0.1-1.2%, and mechanically stirring for 30-120 min at 30-60 ℃ to obtain a uniformly dispersed mineral fiber dispersion liquid, wherein the mass ratio of the oven-dried modified mineral fibers to the dispersant solution is 1: 20-1: 80;
(4) chopping the plant fiber pulp board into fragments, putting the fragments into a sodium hydroxide-urea aqueous solution with the solid content of 4-16% for treatment for 6-24 h according to the absolute dry fragment ratio, taking out the fragments, and adding the fragments into (NH) with the mass concentration of 1-9%4)2SO4Mechanically stirring the solution at 1500rpm for 15-40 min, carrying out solid-liquid separation, and washing the solid to be neutral;
(5) putting the washed paper pulp fibers obtained in the step (4) into water according to the solid content of 0.5-3% by weight of the absolutely dry paper pulp fibers, and mechanically stirring at 2000-3000 rpm for 20-40 min to perform fiber dissociation to obtain a plant fiber solution;
(6) adding the mineral fiber dispersion liquid obtained in the step (3) into the plant fiber solution obtained in the step (5) under the condition of mechanical stirring, adding an adhesive, and mechanically stirring for 10-30 min at 40-60 ℃, wherein the absolute dry mineral fibers account for 5-30% of the total mass of the absolute dry mineral fibers and the absolute dry plant fibers, and the addition amount of the adhesive is 2-16% of the total mass of the absolute dry mineral fibers and the absolute dry plant fibers;
(7) and (3) adopting a wet papermaking process, forming the mixed fiber solution obtained in the step (6) on a standard paper sheet former, spraying a polyvinyl alcohol aqueous solution with the mass concentration of 1-4%, standing for 10-15 min, spraying a rosin ethanol solution with the mass concentration of 0.3-1.5%, and hot-pressing and drying at 95 ℃ for 5min to obtain the natural mineral fiber/plant fiber degradable agricultural mulching film.
2. The preparation method of the natural mineral fiber/plant fiber degradable agricultural mulching film according to claim 1, wherein the natural mineral fiber/plant fiber degradable agricultural mulching film comprises the following steps: the alkali liquor is a sodium hydroxide solution and/or a potassium hydroxide solution, and the concentration of the alkali liquor is 0.5-3 mol/L; the acid solution is one or more of hydrochloric acid solution, sulfuric acid solution, nitric acid solution, phosphoric acid solution, formic acid solution, acetic acid solution, propionic acid solution and oxalic acid solution, and the concentration of the acid solution is 0.5-2.5 mol/L.
3. The preparation method of the natural mineral fiber/plant fiber degradable agricultural mulching film according to claim 1, wherein the natural mineral fiber/plant fiber degradable agricultural mulching film comprises the following steps: the natural mineral fiber is one or more of aluminum silicate fiber, sepiolite fiber, wollastonite fiber, basalt fiber and coal gangue fiber.
4. The preparation method of the natural mineral fiber/plant fiber degradable agricultural mulching film according to claim 1, wherein the natural mineral fiber/plant fiber degradable agricultural mulching film comprises the following steps: the ultrasonic frequency is 45-100 kHz, and the ultrasonic power is 240-600W.
5. The preparation method of the natural mineral fiber/plant fiber degradable agricultural mulching film according to claim 1, wherein the natural mineral fiber/plant fiber degradable agricultural mulching film comprises the following steps: the dispersant is one or more of sodium polyphosphate, diammonium hydrogen phosphate, sodium pyrophosphate and sodium tetraphosphate.
6. The preparation method of the natural mineral fiber/plant fiber degradable agricultural mulching film according to claim 1, wherein the natural mineral fiber/plant fiber degradable agricultural mulching film comprises the following steps: the sodium hydroxide-urea aqueous solution composition comprises 1% of sodium hydroxide, 8% of urea and 91% of water by mass percent.
7. The preparation method of the natural mineral fiber/plant fiber degradable agricultural mulching film according to claim 1, wherein the natural mineral fiber/plant fiber degradable agricultural mulching film comprises the following steps: the adhesive is one or more of polyvinyl alcohol, polyoxyethylene, hydroxypropyl methylcellulose, methyl cellulose and methylcellulose.
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