CN115340696A - Long-acting dripping fog-dispersing agricultural functional film and preparation method thereof - Google Patents
Long-acting dripping fog-dispersing agricultural functional film and preparation method thereof Download PDFInfo
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- CN115340696A CN115340696A CN202211085575.9A CN202211085575A CN115340696A CN 115340696 A CN115340696 A CN 115340696A CN 202211085575 A CN202211085575 A CN 202211085575A CN 115340696 A CN115340696 A CN 115340696A
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- 238000002360 preparation method Methods 0.000 title claims abstract description 13
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- CJZGTCYPCWQAJB-UHFFFAOYSA-L calcium stearate Chemical compound [Ca+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O CJZGTCYPCWQAJB-UHFFFAOYSA-L 0.000 claims description 12
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- GDVKFRBCXAPAQJ-UHFFFAOYSA-A dialuminum;hexamagnesium;carbonate;hexadecahydroxide Chemical compound [OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[Mg+2].[Mg+2].[Mg+2].[Mg+2].[Mg+2].[Mg+2].[Al+3].[Al+3].[O-]C([O-])=O GDVKFRBCXAPAQJ-UHFFFAOYSA-A 0.000 claims description 11
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- NUJOXMJBOLGQSY-UHFFFAOYSA-N manganese dioxide Chemical compound O=[Mn]=O NUJOXMJBOLGQSY-UHFFFAOYSA-N 0.000 claims description 4
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- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid Substances OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 4
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- NWZSZGALRFJKBT-KNIFDHDWSA-N (2s)-2,6-diaminohexanoic acid;(2s)-2-hydroxybutanedioic acid Chemical compound OC(=O)[C@@H](O)CC(O)=O.NCCCC[C@H](N)C(O)=O NWZSZGALRFJKBT-KNIFDHDWSA-N 0.000 claims description 2
- CCJAYIGMMRQRAO-UHFFFAOYSA-N 2-[4-[(2-hydroxyphenyl)methylideneamino]butyliminomethyl]phenol Chemical compound OC1=CC=CC=C1C=NCCCCN=CC1=CC=CC=C1O CCJAYIGMMRQRAO-UHFFFAOYSA-N 0.000 claims description 2
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 claims description 2
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- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 claims description 2
- IKDUDTNKRLTJSI-UHFFFAOYSA-N hydrazine monohydrate Substances O.NN IKDUDTNKRLTJSI-UHFFFAOYSA-N 0.000 claims description 2
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims description 2
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- GCLGEJMYGQKIIW-UHFFFAOYSA-H sodium hexametaphosphate Chemical compound [Na]OP1(=O)OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])O1 GCLGEJMYGQKIIW-UHFFFAOYSA-H 0.000 claims description 2
- 235000019982 sodium hexametaphosphate Nutrition 0.000 claims description 2
- 239000001577 tetrasodium phosphonato phosphate Substances 0.000 claims description 2
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Classifications
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
- C08J7/04—Coating
- C08J7/056—Forming hydrophilic coatings
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G9/00—Cultivation in receptacles, forcing-frames or greenhouses; Edging for beds, lawn or the like
- A01G9/14—Greenhouses
- A01G9/1438—Covering materials therefor; Materials for protective coverings used for soil and plants, e.g. films, canopies, tunnels or cloches
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
- C08J7/04—Coating
- C08J7/054—Forming anti-misting or drip-proofing coatings
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
- C08J7/04—Coating
- C08J7/06—Coating with compositions not containing macromolecular substances
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/04—Homopolymers or copolymers of ethene
- C08J2323/08—Copolymers of ethene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2423/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2423/04—Homopolymers or copolymers of ethene
- C08J2423/06—Polyethene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2296—Oxides; Hydroxides of metals of zinc
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
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- C08K2201/011—Nanostructured additives
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
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- C08K9/08—Ingredients agglomerated by treatment with a binding agent
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- 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
- Y02A40/25—Greenhouse technology, e.g. cooling systems therefor
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- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
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- Greenhouses (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention discloses a long-acting dripping fog-dissipation agricultural functional film and a preparation method thereof, relates to the field of agricultural films, and aims to solve the problems that the durability of a layer formed by coating the existing fog-dissipation agent is poor, repeated spraying is often needed in the using process, and the cost of agricultural production is increased.
Description
Technical Field
The invention relates to the technical field of agricultural films, in particular to a long-acting dripping fog-dissipation agricultural functional film and a preparation method thereof.
Background
The technology is continuously developed forward, and the development of the material science and technology also obtains better results. Polymers represented by high molecular materials and the like are widely used in films for agricultural greenhouses. Because the greenhouse can improve the external environmental conditions for the growth of crops, the growth of the crops is not limited by seasons and temperature any more, and various out-of-season vegetables and fruits can continuously go to the dining table of people. The development of greenhouse technology does not leave the great contribution of high-molecular polymer film materials. The technology has been developed greatly in agriculture-intensive countries such as Japan and the like in the 1950 s, and the greenhouse prepared by the covering greenhouse made of the high polymer material has extremely strong agricultural production and application. The targeted technology in China originates from the fifties of the last century, and the special agricultural film mainly made of polyethylene is introduced for the first time, and is applied in small scale in the agricultural production of Beijing, so that the special agricultural film has better effects of increasing the yield of crops and quickly maturing the crops. After two years, the actual production value of the application achievement is obvious, so the method is popularized to the whole country, the agricultural greenhouse film production is actively developed, and the pursuit of vast farmers is brought. By the eighth year of the introduction of technology, china has mastered the relevant polyethylene production technology and greenhouse technology, represented by small greenhouse coverage, began to scale. The miniature greenhouse technology is the first rudiment, and the arched small greenhouse production technology arouses the consistent favorable comment of farmers.
Under extreme weather changes in the use, can produce huge influence to holistic big-arch shelter film light transmissivity. Because there is huge temperature difference inside and outside the big-arch shelter, this phenomenon that can appear condensing when touching cold big-arch shelter film of high humidity and high temperature vapor in just making the big-arch shelter, because freezing of the steam that can not appear condensing is higher to holistic big-arch shelter temperature, but the water droplet that condenses can remain on the film, sunlight from the big-arch shelter outer transparent film material of passing through then see through the water film that forms on the big-arch shelter film, diffuse reflection's physical effect can appear in sunshine, holistic big-arch shelter luminousness descends. As the plants are known to grow in the sunlight for photosynthesis, the light intensity is in direct proportion to the photosynthesis intensity of the plants, so that a water film exists on a plastic film of a greenhouse and the photosynthesis of the plants is established invisibly.
The existing research surface: the agricultural plastic film is sprayed with a layer of super-hydrophilic substance to form a super-hydrophilic interface on the surface of a plastic product, so that dripping and fogging can be effectively prevented, the plastic film without the anti-fogging agent has poor surface hydrophilicity and does not have anti-fogging property, after the anti-fogging agent is added into the plastic film, the molecular motion of the anti-fogging agent can gradually migrate to the surface of the film through an amorphous region in the plastic film to be directionally arranged, hydrophilic groups of molecules of the anti-fogging agent are automatically arranged on the outer side of the film and lean against the air, and hydrophobic groups are automatically arranged on the inner side of the film, so that the film with hydrophilicity is formed. The agricultural functional film antifogging drops generally have two application methods: one is used as additive material added into agricultural film and the other is prepared into fog dispersing solution for coating the surface of film.
The above prior art solutions have the following drawbacks: the existing antifogging agent is poor in durability of a layer formed by coating, repeated spraying is often needed in the using process, the cost of agricultural production is increased, and the effective period of the antifogging agent is short and is generally 3-6 months.
Disclosure of Invention
The invention aims to provide a long-acting dripping fog-dispersing agricultural functional film and a preparation method thereof.
In order to realize the purpose, the invention provides the following technical scheme:
the agricultural functional film is a polyethylene film, a super-hydrophilic coating covers one surface of the polyethylene film, the super-hydrophilic coating is formed by coating a super-hydrophilic anti-fog dripping agent, the super-hydrophilic anti-fog dripping agent is mixed with hydrophilic modified carbon nano tubes, the modified carbon nano tubes are subjected to surface hydrophilic modification treatment, and nano zinc oxide is added into the super-hydrophilic anti-fog dripping agent.
By adopting the technical scheme, the super-hydrophilic coating formed by the super-hydrophilic anti-fog dripping agent mixed with the hydrophilic modified carbon nano tubes can effectively improve the surface anti-fog effect of the agricultural functional film, the hydrophilic groups of the hydrophilic modified carbon nano tubes are exposed on the surface of the film, so that the whole surface of the PE film becomes hydrophilic, the contact angle of water on the surface of the film is close to 0 degree, water vapor is condensed into water drops by a non-condensation method, the anti-fog effect is achieved, the nano zinc oxide is added, the binding force of the spraying type anti-fog agent and the greenhouse film is enhanced by utilizing the characteristic of high defect density of nano particles, and the effective period of the anti-fog agent is prolonged. The nano zinc oxide has the characteristics of small particle size, large specific surface area, high activity and the like, and plays a good role in dispersing and adhering in the antifogging agent, so that the durability of the super-hydrophilic coating formed by spraying the super-hydrophilic antifogging agent on the antifogging agricultural functional film once is effectively improved, the antifogging effect is improved to 10-12 months from 3-6 months, the cost of agricultural production is reduced, and the suitability and stability of the growth conditions of crops are guaranteed to the maximum extent.
Further, the raw materials comprise the following components in parts by weight: 80-120 parts of linear low-density polyethylene, 20-40 parts of low-density polyethylene, 10-12 parts of hydrotalcite, 15-20 parts of additive, 5-10 parts of anti-fogging slow-release agent and 20-25 parts of super-hydrophilic anti-fogging agent.
Further, the additive comprises the following raw materials in parts by weight: 1.5-2 parts of tea polyphenol with the mass fraction of 99%, 2.5-3 parts of hindered amine light stabilizer and 7.5-10 parts of lubricant calcium stearate; 3.5-5 parts of plasticizer caprolactam.
Further, the anti-fogging sustained-release agent is made of one or more materials of talcum powder, diatom, superfine kaolin and sericite.
By adopting the technical scheme, the hydrotalcite is a layered composite metal oxide with a unique structure, has relatively superior heat preservation, thermal stability and permeability increasing performance as a filler, is porous, can improve the anti-fogging lasting period of a greenhouse film by adding the adsorption slow-release agent of the anti-fogging agent in the production of the film, and has good adsorption slow-release effect on the anti-fogging agent.
The tea polyphenol can be used as an antioxidant to delay the aging of materials and prevent air from oxidizing the materials, so that the service life is prolonged, and the action mechanism of the antioxidant is that the automatic oxidation reaction comprises chain initiation, chain growth and chain termination. The molecular weight of the antioxidant is increased, so that the thermal stability of the antioxidant in processing can be improved. The increase of the molecular weight means that branched chains are increased, carbon chains are lengthened, the carbon content is increased, the compatibility of the film with polymers is improved, hindered amine has a good inhibition effect on the photo-oxidative degradation reaction of high polymers and organic compounds, and antioxidants and light stabilizers can effectively reduce the degradation rate of the film in daily use and prolong the service life of the whole film.
When the agricultural plastic greenhouse film is produced, because the viscosity is high, the melt is thin, when the agricultural plastic greenhouse film is melted, mixed and extruded at high temperature, friction can occur between extrusion blow molding equipment and materials, and if the agricultural plastic greenhouse film is not processed in time, the appearance of the agricultural plastic greenhouse film can be affected. On the other hand, the lubricant calcium stearate can reduce the friction between the materials and extrusion blow molding equipment, not only can prevent the materials from being adhered, but also can increase the fluidity, so that the greenhouse film product has a smooth surface.
The caprolactam plasticizer can improve the performance of the polymer material, reduce the production cost and increase the benefit mainly used for production. After the plasticizer is used, the secondary valence bonds among resin molecules are weakened, the mobility of the resin molecular bonds is enhanced, the crystallization capacity of the resin molecules is reduced, and the plasticity of the resin molecules is increased, so that the flexibility is enhanced, and the resin is easy to process.
Further, the super-hydrophilic anti-fog dripping agent comprises the following raw materials in parts by weight: 6-8.5 parts of silica sol, 0.3-0.4 part of hydrophilic modified carbon nano tube, 18-23 parts of deionized water and 0.7-1.1 part of nano zinc oxide.
Further, the super-hydrophilic anti-fog dripping agent is added with a dispersing agent to disperse hydrophilic modified carbon nano tubes, wherein the dispersing agent is one or more of sodium hexametaphosphate, acrylamide and N-hydroxymethyl acrylamide.
Through adopting above-mentioned technical scheme, carbon nanotube has unique structure and good property, but too high slenderness ratio and carbon nanotube are insoluble in most solvents and the interact power between the carbon nanotube make carbon nanotube often agglomerate together, add above-mentioned dispersant and can well wrap up hydrophilic modified carbon nanotube and produce the steric hindrance effect and disperse the carbon nanotube, prevent to take place to agglomerate, guarantee that super hydrophilic coating can evenly stable the formation, improve the antifog drop effect.
Further, the preparation process of the hydrophilic modified carbon nano tube comprises the following steps:
A. adding 0.4-0.6 part of concentrated sulfuric acid and 0.9-1.1 part of sodium nitrate into a dry beaker under the ice bath condition, continuously stirring to completely dissolve the concentrated sulfuric acid and the sodium nitrate, slowly adding 1.8-2.2 parts of carbon nano tubes when the temperature of the system is lower than 5 ℃, uniformly mixing, slowly adding 6-7 parts of potassium permanganate, controlling the temperature of the reaction solution to be not higher than 20 ℃, and continuously stirring for 2-3 hours.
B. And D, continuously reacting the solution prepared in the step A in a water bath kettle at the temperature of 36-37 ℃ for 1-1.2h. After the reaction is finished, 9-9.5 parts of deionized water is added, the mixture is stirred for 14-16min at 96-99 ℃, then a large amount of water is added to stop the reaction, 0.4-0.6 part of 30% hydrogen peroxide is added to remove excessive potassium permanganate and generated manganese dioxide, the mixture is centrifuged when the mixture is hot, diluted hydrochloric acid (1).
C. And D, drying the solution prepared in the step B in an oven at the temperature of 45-50 ℃ for 5-6h to obtain the carbon oxide nano tube.
D. And C, weighing 0.28-0.38 part of the carbon oxide nanotube prepared in the step C, adding 2-2.8 parts of cyclodextrin, stirring at 58-62 ℃ until the cyclodextrin is completely dissolved, dropwise adding 1-1.8mL of ammonia water, and adjusting the pH to about 10.
E. And D, adding 0.5-0.7 part of hydrazine hydrate into the solution in the step D, and stirring for about 30-35min. Violently stirring for 3.5-4h at 88-92 ℃ under the condition of oil bath, after the reaction is finished,
F. and E, washing the product obtained in the step E for 3-5 times by using warm water at the temperature of 30-40 ℃, and drying in an oven for 12-13h at the temperature of 58-62 ℃ to obtain 0.3-0.4 part of hydrophilic modified carbon nano tube product.
By adopting the technical scheme, each D (+) -glucopyranose of the cyclodextrin molecule is in a chair-type conformation, and each glucose unit is combined into a ring by a 1, 4-glycosidic bond. The molecular structure of the cyclodextrin is a slightly conical circular ring because the glycosidic bond cannot rotate freely, and the large ring structure of the beta-CD has special performance, namely the outer edge is hydrophilic and the inner cavity is hydrophobic, so that the cyclodextrin can provide a hydrophobic binding site like enzyme, and can be used as a host to envelop proper organic molecules, inorganic ions and other objects under the actions of van der Waals force, hydrophobic interaction force, matching degree between host and object molecules and the like, and the carbon nanotube modified by the cyclodextrin can conveniently and effectively improve the hydrophilicity of the carbon nanotube.
Further, the preparation method of the long-acting dripping fog-dissipation agricultural functional film comprises the following steps:
s1, weighing 80-120 parts of linear low-density polyethylene, 20-40 parts of low-density polyethylene and 10-12 parts of hydrotalcite according to a ratio, and drying and pretreating the ingredients in an oven at 50-55 ℃ before use;
s2, weighing 1.5-2 parts of tea polyphenol with the mass fraction of 99%, 2.5-3 parts of hindered amine light stabilizer and 7.5-10 parts of lubricant calcium stearate according to the proportion; 3.5-5 parts of caprolactam serving as a plasticizer, 5-10 parts of an anti-fogging slow-release agent and the raw materials in the step S1 are added into a high-speed kneader, are fully mixed into slurry, flow into a slurry containing barrel and are poured into a hopper of an extruder set;
s3, pouring the material obtained in the step S2 into a single-screw extruder for melting and plasticizing, and then extruding and molding by a film blowing machine head; introducing compressed air after extrusion, blowing the compressed air, and starting a traction roller to draw and stretch the film bubble; starting a fan to blow cold air to the surface of the film, and slowly cooling the film bubble until the film bubble is cooled and shaped; pressing and laminating the film bubble by using a herringbone plate, then drawing by using a drawing roller, automatically winding the product by using a winding machine, and cutting off redundant edges to obtain an agricultural film;
s4, weighing 0.7-1.1 parts of nano zinc oxide according to the proportion, pouring into a magnetic stirrer containing 13-15 parts of deionized water, heating in a water bath at 45-55 ℃, and fully stirring for 20-25min to form a solution A;
s5, weighing 0.8-1 part of dispersing agent and 0.3-0.4 part of hydrophilic modified carbon nano tube, pouring into 6-8.5 parts of silicon dioxide sol, and fully stirring for 30-35min to form a solution B;
and S6, slowly pouring the solution B in the step S5 into the solution A in the step S4, adding 5-8 parts of deionized water for dilution, and stirring for 15-20min to form stable dispersion liquid, thereby preparing the super-hydrophilic anti-fog drip agent.
S7, cutting the agricultural film prepared in the step S3 according to actual size requirements, fixing the agricultural film on a vertically placed glass plate, uniformly spraying the super-hydrophilic anti-fog dripping agent prepared in the step S6 on the agricultural film by using a sprayer, pushing and pulling the sprayer for 15-20 times, and drying in a drying box at the temperature of 30-35 ℃ for 8-10 hours to obtain the long-acting dripping fog-dissipation agricultural functional film.
By adopting the technical scheme, the non-permeable functional additive is added, so that the comprehensive quality of the finished agricultural functional film can be effectively improved, and the anti-fog functional film has the advantages of high light transmittance, stability and ageing resistance, smooth surface, strong plasticity, lasting anti-fog drop effect and the like, meanwhile, the manufacturing method is simple, the production cycle is short, the adhesive property with a base material is good, repeated spraying and washing resistance can be realized, the use material and labor cost of the agricultural functional film are effectively reduced, the anti-fog drop aging of the super-hydrophilic coating is improved to 8-12 months from 3-6 months, and the crops can be guaranteed to pass through a complete production cycle under a stable and appropriate condition, so that the yield is guaranteed.
In conclusion, the beneficial technical effects of the invention are as follows:
1. the nano zinc oxide and the anti-fogging slow-release agent are adopted, so that the durability of the super-hydrophilic coating formed by spraying the super-hydrophilic anti-fogging agent on the agricultural functional film for one time is effectively improved, the anti-fogging effect is improved from 3-6 months to 10-12 months, and the effect of reducing the cost of agricultural production is generated;
2. the cyclodextrin is adopted to modify the carbon nano tube and the dispersant, so that the effect of effectively improving the hydrophilicity of the carbon nano tube to form a stable super-hydrophilic coating is achieved;
3. the super-hydrophilic coating is formed by coating the super-hydrophilic anti-fog dripping agent, so that the effect of conveniently and repeatedly spraying after the super-hydrophilic coating fails is achieved.
Detailed Description
The present invention will be described in further detail with reference to examples.
Example 1
The agricultural functional film is prepared by the following steps
S1, weighing 80-120 parts of linear low-density polyethylene, 20-40 parts of low-density polyethylene and 10-12 parts of hydrotalcite according to a ratio, and drying and pretreating the ingredients in an oven at 50-55 ℃ before use;
s2, weighing 1.5-2 parts of tea polyphenol with the mass fraction of 99%, 2.5-3 parts of hindered amine light stabilizer and 7.5-10 parts of lubricant calcium stearate according to the proportion; 3.5-5 parts of caprolactam serving as a plasticizer, 5-10 parts of an anti-fogging slow-release agent and the raw materials in the step S1 are added into a high-speed kneader, are fully mixed into slurry, flow into a slurry containing barrel and are poured into a hopper of an extruder set;
s3, pouring the material obtained in the step S2 into a single-screw extruder for melting and plasticizing, and then extruding and molding by a film blowing machine head; introducing compressed air after extrusion, blowing the compressed air, and starting a traction roller to draw and stretch the film bubble; starting a fan to blow cold air to the surface of the film, and slowly cooling the film bubble until the film bubble is cooled and shaped; pressing the laminated film bubble by using a herringbone plate, then drawing by using a drawing roller, automatically winding the product by using a winding machine, and cutting off redundant edges to obtain an agricultural film;
s4, weighing 0.7-1.1 parts of nano zinc oxide according to the proportion, pouring into a magnetic stirrer containing 13-15 parts of deionized water, heating in a water bath at 45-55 ℃, and fully stirring for 20-25min to form a solution A;
s5, weighing 0.8-1 part of dispersing agent and 0.3-0.4 part of hydrophilic modified carbon nano tube, pouring into 6-8.5 parts of silicon dioxide sol, and fully stirring for 30-35min to form a solution B;
and S6, slowly pouring the solution B in the step S5 into the solution A in the step S4, adding 5-8 parts of deionized water for dilution, and stirring for 15-20min to form stable dispersion liquid, thereby preparing the super-hydrophilic anti-fog dripping agent.
S7, cutting the agricultural film prepared in the step S3 according to actual size requirements, fixing the agricultural film on a vertically placed glass plate, uniformly spraying the super-hydrophilic anti-fog dripping agent prepared in the step S6 on the agricultural film by using a sprayer, pushing and pulling the sprayer for 15-20 times, and drying in a drying box at the temperature of 30-35 ℃ for 8-10 hours to obtain the agricultural functional film 1.
Example 2
The agricultural functional film is prepared by the following steps
S1, weighing 80-120 parts of linear low-density polyethylene, 20-40 parts of low-density polyethylene and 10-12 parts of hydrotalcite according to a ratio, and drying and pretreating the ingredients in an oven at 50-55 ℃ before use;
s2, weighing 5-10 parts of anti-fogging sustained-release agent according to the proportion, adding the anti-fogging sustained-release agent and the raw materials in the step S1 into a high-speed kneader, fully mixing the anti-fogging sustained-release agent and the raw materials into slurry, then flowing into a slurry containing barrel, and then pouring into a hopper of an extruder set;
s3, pouring the material obtained in the step S2 into a single-screw extruder for melting and plasticizing, and then extruding and molding through a film blowing machine head; introducing compressed air after extrusion, blowing the compressed air, and starting a traction roller to draw and stretch the film bubble; starting a fan to blow cold air to the surface of the film, and slowly cooling the film bubble until the film bubble is cooled and shaped; pressing the laminated film bubble by using a herringbone plate, then drawing by using a drawing roller, automatically winding the product by using a winding machine, and cutting off redundant edges to obtain an agricultural film;
s4, weighing 0.7-1.1 parts of nano zinc oxide according to the proportion, pouring the nano zinc oxide into a magnetic stirrer containing 13-15 parts of deionized water, heating the nano zinc oxide in a water bath at 45-55 ℃, and fully stirring the nano zinc oxide for 20-25min to form solution A;
s5, weighing 0.8-1 part of dispersing agent and 0.3-0.4 part of hydrophilic modified carbon nano tube, pouring into 6-8.5 parts of silicon dioxide sol, and fully stirring for 30-35min to form a solution B;
and S6, slowly pouring the solution B in the step S5 into the solution A in the step S4, adding 5-8 parts of deionized water for dilution, and stirring for 15-20min to form stable dispersion liquid, thereby preparing the super-hydrophilic anti-fog dripping agent.
S7, cutting the agricultural film prepared in the step S3 according to actual size requirements, fixing the agricultural film on a vertically placed glass plate, uniformly spraying the super-hydrophilic anti-fog dripping agent prepared in the step S6 on the agricultural film by using a sprayer, pushing and pulling the sprayer for 15-20 times, and drying in a drying box at the temperature of 30-35 ℃ for 8-10 hours to obtain the agricultural functional film 2.
Example 3
The agricultural functional film is prepared by the following steps
S1, weighing 80-120 parts of linear low-density polyethylene, 20-40 parts of low-density polyethylene and 10-12 parts of hydrotalcite according to a ratio, and drying and pretreating the ingredients in an oven at 50-55 ℃ before use;
s2, weighing 1.5-2 parts of tea polyphenol with the mass fraction of 99%, 2.5-3 parts of hindered amine light stabilizer and 7.5-10 parts of lubricant calcium stearate according to the proportion; 3.5-5 parts of caprolactam serving as a plasticizer and the raw materials in the step S1 are added into a high-speed kneader together, so that the caprolactam and the raw materials are fully mixed into slurry, the slurry flows into a slurry containing barrel, and the slurry flows into a hopper of an extruder set;
s3, pouring the material obtained in the step S2 into a single-screw extruder for melting and plasticizing, and then extruding and molding through a film blowing machine head; introducing compressed air after extrusion, blowing the compressed air, and starting a traction roller to draw and stretch the film bubble; starting a fan to blow cold air to the surface of the film, and slowly cooling the film bubble until the film bubble is cooled and shaped; pressing and laminating the film bubble by using a herringbone plate, then drawing by using a drawing roller, automatically winding the product by using a winding machine, and cutting off redundant edges to obtain an agricultural film;
s4, weighing 0.8-1 part of dispersing agent and 0.3-0.4 part of hydrophilic modified carbon nano tube, pouring into 6-8.5 parts of silicon dioxide sol, and fully stirring for 30-35min;
and S5, slowly pouring 5-8 parts of deionized water into the solution obtained in the step S4 for dilution, and stirring for 15-20min to form a stable dispersion liquid, so as to obtain the super-hydrophilic anti-fog dripping agent.
S6, cutting the agricultural film prepared in the step S3 according to actual size requirements, fixing the agricultural film on a vertically placed glass plate, uniformly spraying the super-hydrophilic anti-fog dripping agent prepared in the step S6 on the agricultural film by using a sprayer, pushing and pulling the sprayer for 15-20 times, and drying in a drying box at the temperature of 30-35 ℃ for 8-10 hours to obtain the agricultural functional film 3.
Example 4
The agricultural functional film is prepared by the following steps
S1, weighing 80-120 parts of linear low-density polyethylene, 20-40 parts of low-density polyethylene and 10-12 parts of hydrotalcite according to a ratio, and drying and pretreating the ingredients in an oven at 50-55 ℃ before use;
s2, weighing 1.5-2 parts of tea polyphenol with the mass fraction of 99%, 2.5-3 parts of hindered amine light stabilizer and 7.5-10 parts of lubricant calcium stearate according to the proportion; 3.5-5 parts of caprolactam serving as a plasticizer and the raw materials in the step S1 are added into a high-speed kneader together, so that the caprolactam and the raw materials are fully mixed into slurry, the slurry flows into a slurry containing barrel, and the slurry flows into a hopper of an extruder set;
s3, pouring the material obtained in the step S2 into a single-screw extruder for melting and plasticizing, and then extruding and molding by a film blowing machine head; introducing compressed air after extrusion, blowing the compressed air, and starting a traction roller to draw and stretch the film bubble; starting a fan to blow cold air to the surface of the film, and slowly cooling the film bubble until the film bubble is cooled and shaped; pressing and laminating the film bubble by using a herringbone plate, then drawing by using a drawing roller, automatically winding the product by using a winding machine, and cutting off redundant edges to obtain an agricultural film;
s4, weighing 0.7-1.1 parts of nano zinc oxide according to the proportion, pouring into a magnetic stirrer containing 13-15 parts of deionized water, heating in a water bath at 45-55 ℃, and fully stirring for 20-25min to form a solution A;
s5, weighing 0.8-1 part of dispersing agent and 0.3-0.4 part of hydrophilic modified carbon nano tube, pouring into 6-8.5 parts of silicon dioxide sol, and fully stirring for 30-35min to form a solution B;
and S6, slowly pouring the solution B in the step S5 into the solution A in the step S4, adding 5-8 parts of deionized water for dilution, and stirring for 15-20min to form stable dispersion liquid, thereby preparing the super-hydrophilic anti-fog dripping agent.
S7, cutting the agricultural film prepared in the step S3 according to actual size requirements, fixing the agricultural film on a vertically placed glass plate, uniformly spraying the super-hydrophilic antifogging drip agent prepared in the step S6 on the agricultural film by using a sprayer, pushing and pulling the sprayer to reciprocate for 15-20 times, and drying in a drying box at the temperature of 30-35 ℃ for 8-10 hours to obtain the agricultural functional film 4.
Example 5
The agricultural functional film is prepared by the following steps
S1, weighing 80-120 parts of linear low-density polyethylene, 20-40 parts of low-density polyethylene and 10-12 parts of hydrotalcite according to a ratio, and drying and pretreating the ingredients in an oven at 50-55 ℃ before use;
s2, weighing 1.5-2 parts of tea polyphenol with the mass fraction of 99%, 2.5-3 parts of hindered amine light stabilizer and 7.5-10 parts of lubricant calcium stearate according to the proportion; 3.5-5 parts of caprolactam serving as a plasticizer, 5-10 parts of an anti-fogging slow-release agent and the raw materials in the step S1 are added into a high-speed kneader to be fully mixed into slurry, and then the slurry flows into a slurry containing barrel and is poured into a hopper of an extruder set;
s3, pouring the material obtained in the step S2 into a single-screw extruder for melting and plasticizing, and then extruding and molding by a film blowing machine head; introducing compressed air after extrusion, blowing the compressed air, and starting a traction roller to draw and stretch the film bubble; starting a fan to blow cold air to the surface of the film, and slowly cooling the film bubble until the film bubble is cooled and shaped; pressing and laminating the film bubble by using a herringbone plate, then drawing by using a drawing roller, automatically winding the product by using a winding machine, and cutting off redundant edges to obtain an agricultural film;
s4, weighing 0.8-1 part of dispersing agent and 0.3-0.4 part of hydrophilic modified carbon nano tube, pouring into 6-8.5 parts of silicon dioxide sol, and fully stirring for 30-35min;
and S5, slowly pouring 5-8 parts of deionized water into the solution obtained in the step S4 for dilution, and stirring for 15-20min to form a stable dispersion liquid, so as to obtain the super-hydrophilic anti-fog dripping agent.
S6, cutting the agricultural film prepared in the step S3 according to actual size requirements, fixing the agricultural film on a vertically placed glass plate, uniformly spraying the super-hydrophilic anti-fog dripping agent prepared in the step S6 on the agricultural film by using a sprayer, pushing and pulling the sprayer for 15-20 times, and drying in a drying box at the temperature of 30-35 ℃ for 8-10 hours to obtain the agricultural functional film 5.
Example 6
The agricultural functional film is prepared by the following steps
S1, weighing 80-120 parts of linear low-density polyethylene, 20-40 parts of low-density polyethylene and 10-12 parts of hydrotalcite according to a ratio, and drying and pretreating the ingredients in an oven at 50-55 ℃ before use;
s2, weighing 1.5-2 parts of tea polyphenol with the mass fraction of 99%, 2.5-3 parts of hindered amine light stabilizer and 7.5-10 parts of lubricant calcium stearate according to the proportion; 3.5-5 parts of caprolactam serving as a plasticizer, 5-10 parts of an anti-fogging slow-release agent and the raw materials in the step S1 are added into a high-speed kneader to be fully mixed into slurry, and then the slurry flows into a slurry containing barrel and is poured into a hopper of an extruder set;
s3, pouring the material obtained in the step S2 into a single-screw extruder for melting and plasticizing, and then extruding and molding by a film blowing machine head; introducing compressed air after extrusion, blowing the compressed air, and starting a traction roller to draw and stretch the film bubble; starting a fan to blow cold air to the surface of the film, and slowly cooling the film bubble until the film bubble is cooled and shaped; pressing and laminating the film bubble by using a herringbone plate, then drawing by using a drawing roller, automatically winding the product by using a winding machine, and cutting off redundant edges to obtain an agricultural film;
s4, weighing 0.7-1.1 parts of nano zinc oxide according to the proportion, pouring the nano zinc oxide into a magnetic stirrer containing 13-15 parts of deionized water, heating the nano zinc oxide in a water bath at 45-55 ℃, and fully stirring the nano zinc oxide for 20-25min to form solution A;
s5, weighing 0.3-0.4 part of hydrophilic modified carbon nano tube, pouring into 6-8.5 parts of silicon dioxide sol, and fully stirring for 30-35min to form a solution B;
and S6, slowly pouring the solution B in the step S5 into the solution A in the step S4, adding 5-8 parts of deionized water for dilution, and stirring for 15-20min to form stable dispersion liquid, thereby preparing the super-hydrophilic anti-fog dripping agent.
S7, cutting the agricultural film prepared in the step S3 according to actual size requirements, fixing the agricultural film on a vertically placed glass plate, uniformly spraying the super-hydrophilic anti-fog dripping agent prepared in the step S6 on the agricultural film by using a sprayer, pushing and pulling the sprayer for 15-20 times, and drying in a drying box at the temperature of 30-35 ℃ for 8-10 hours to obtain the agricultural functional film 6.
The tests of examples 1-6, including the fogging effect test, the performance test of the long-acting agricultural film anti-fogging drip agent and the anti-aging test,
and (3) testing the fogging effect: finished samples prepared in examples 1-6, each 0.20m × 0.20m in size, were cut out, fixed on two glass surfaces of an appropriate size with double-sided tape, and a fogging test was performed by blowing a humid gas using a humidifier onto the surfaces for 2min, and observing fogging and other properties.
The performance test of the long-acting antifogging dripping agent for the agricultural film comprises the following steps: (1) measurement of initial drop time and ten drop time: the initial dropping time is a macroscopic expression mode of the antifogging film without fog drops and the hydrophilic ability; the ten-drop time refers to the time for ten continuous drops of water to fall after the initial drop, and represents the fog dissipation capacity of the film. The initial drop time and the ten drop time were measured according to GB/T19603-2004. (2) high-temperature duration testing: covering the PE film sprayed with the anti-fog dripping agent on a large beaker filled with 300ml of water, controlling the water bath temperature to be 60 ℃, pressing down the center of the film surface to ensure that the included angle between the film surface and the horizontal plane is 15-20 ℃, when the surface of the film is covered with water drops to reach 1/3 of the area of the cup opening, determining that the film is invalid, and taking the time from the beginning of anti-fog to the invalidation as the anti-fog lasting period and adopting the anti-fog dripping agent sold in the market as a reference group.
Aging test, taking the finished samples with the sizes of 0.20m × 0.30m prepared in the examples 1-6, placing the samples in an aging test chamber for 15 days, and measuring the aging degree;
the test results are shown in tables 1-3:
table 1 fogging effect test table
TABLE 2 Performance test Table for antifogging and dripping agent of long-acting agricultural film
TABLE 3 anti-aging test
Analysis table 1 shows that the functional film 2 has obvious granular feeling on the surface without adding lubricant calcium stearate, compared with other functional film finished products, the surface is poor in smoothness, the lubricant calcium stearate can effectively improve the smoothness of the final product of the functional film, and meanwhile, compared with other functional films, the functional film 6 is added with a dispersing agent to cause that hydrophilic modified carbon nano tubes agglomerate in super-hydrophilic anti-fog dripping agents to cause uneven distribution of hydrophilic coatings and locally generate water fog to influence the anti-fog effect.
By analyzing the table 2, comparing the functional film 4 with the functional film 5, the functional film with the nano zinc oxide added alone has longer duration of the anti-fogging effect than the functional film with the anti-fogging slow-release agent added alone, the functional film 1 is added with the nano zinc oxide and the anti-fogging slow-release agent simultaneously, so that the duration of the anti-fogging effect can be greatly improved, and the follow-up tracking experiment shows that the anti-fogging effect is improved from 3-6 months to 10-12 months.
Through analysis table 3, the functional film 2 is compared with other functional films, the functional film 2 without the tea polyphenol antioxidant and the hindered amine light stabilizer has the aging degree far higher than that of other functional films, the anti-aging capability is weaker, and the service life of the functional film can be effectively prolonged by adding the tea polyphenol and the hindered amine light stabilizer.
To sum up, the super-hydrophilic coating formed by the super-hydrophilic antifogging agent combined with the hydrophilic modified carbon nano tube can effectively improve the antifogging effect of the surface of the agricultural functional film, the hydrophilic group of the hydrophilic modified carbon nano tube is exposed on the surface of the film, so that the surface of the PE film integrally becomes hydrophilic, the contact angle of water on the surface of the film is close to 0 degree, water vapor is condensed into water drops in a failure mode, the antifogging effect is achieved, nano zinc oxide is added, the binding force of the spraying antifogging agent and the greenhouse film is enhanced by utilizing the characteristic of high defect density of nano particles, and the effective period of the antifogging agent is prolonged. The nano zinc oxide has the characteristics of small particle size, large specific surface area, high activity and the like, so that the nano zinc oxide has good dispersion and adhesion effects in an antifogging agent and is combined with a porous structure of an antifogging drop slow-release agent, the absorption slow-release effect on an antifogging agent is good, the durability of a super-hydrophilic antifogging agent formed by spraying the super-hydrophilic antifogging agent on an antifogging agricultural functional film once is effectively improved, the long-acting drip antifogging agricultural functional film is high in comprehensive quality, and the film has the advantages of good light transmittance, stability, ageing resistance, smooth surface, strong plasticity, lasting antifogging effect and the like.
The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: equivalent changes made according to the structure, shape and principle of the invention shall be covered by the protection scope of the invention.
Claims (8)
1. A long-acting dripping fog-dispersing agricultural functional film and a preparation method thereof are characterized in that: the agricultural functional film is a polyethylene film, a super-hydrophilic coating covers one surface of the polyethylene film, the super-hydrophilic coating is formed by coating a super-hydrophilic anti-fog dripping agent, the super-hydrophilic anti-fog dripping agent is mixed with hydrophilic modified carbon nano tubes, the modified carbon nano tubes are subjected to surface hydrophilic modification treatment, and nano zinc oxide is added into the super-hydrophilic anti-fog dripping agent.
2. The long-acting dripping fog-dispersal agricultural functional film as claimed in claim 1, which is characterized in that the raw materials comprise the following components in parts by weight: 80-120 parts of linear low-density polyethylene, 20-40 parts of low-density polyethylene, 10-12 parts of hydrotalcite, 15-20 parts of additive, 5-10 parts of anti-fogging slow-release agent and 20-25 parts of super-hydrophilic anti-fogging agent.
3. The long-acting dripping fog-dispersal agricultural functional film and the preparation method thereof as claimed in claim 2, wherein the additive comprises the following raw materials in parts by weight: 1.5-2 parts of tea polyphenol with the mass fraction of 99%, 2.5-3 parts of hindered amine light stabilizer and 7.5-10 parts of lubricant calcium stearate; 3.5-5 parts of plasticizer caprolactam.
4. The long-acting dripping fog-dispersal agricultural functional film and the preparation method thereof as claimed in claim 2, characterized in that: the anti-fogging sustained-release agent is prepared from one or more materials of talcum powder, diatom, superfine kaolin and sericite.
5. The long-acting dripping fog-dispersal agricultural functional film and the preparation method thereof as claimed in claim 4, wherein the super-hydrophilic anti-fog dripping agent comprises the following raw materials in parts by weight: 6-8.5 parts of silica sol, 0.3-0.4 part of hydrophilic modified carbon nano tube, 18-23 parts of deionized water and 0.7-1.1 part of nano zinc oxide.
6. The long-acting dripping fog-dispersal agricultural functional film and the preparation method thereof as claimed in claim 5, wherein: the super-hydrophilic anti-fog dripping agent is added with a dispersing agent for dispersing hydrophilic modified carbon nano tubes, wherein the dispersing agent is one or more of sodium hexametaphosphate, acrylamide and N-hydroxymethyl acrylamide.
7. The long-acting dripping fog-dispersal agricultural functional film according to claim 6, wherein the preparation process of the hydrophilic modified carbon nano-tube comprises the following steps:
A. adding 0.4-0.6 part of concentrated sulfuric acid and 0.9-1.1 part of sodium nitrate into a dry beaker under the ice bath condition, continuously stirring to completely dissolve the concentrated sulfuric acid and the sodium nitrate, slowly adding 1.8-2.2 parts of carbon nano tubes when the temperature of the system is lower than 5 ℃, uniformly mixing, slowly adding 6-7 parts of potassium permanganate, controlling the temperature of the reaction solution to be not higher than 20 ℃, and continuously stirring for 2-3 hours.
B. And D, putting the solution prepared in the step A into a water bath kettle at the temperature of 36-37 ℃ to continue to react for 1-1.2h. After the reaction is finished, 9-9.5 parts of deionized water is added, the mixture is stirred for 14-16min at 96-99 ℃, then a large amount of water is added to stop the reaction, 0.4-0.6 part of 30% hydrogen peroxide is added to remove excessive potassium permanganate and generated manganese dioxide, the mixture is centrifuged when the mixture is hot, the mixture is washed by dilute hydrochloric acid (1).
C. And D, drying the solution prepared in the step B in an oven at 45-50 ℃ for 5-6h to obtain the carbon oxide nano tube.
D. And C, weighing 0.28-0.38 part of the carbon oxide nanotube prepared in the step C, adding 2-2.8 parts of cyclodextrin, stirring at 58-62 ℃ until the cyclodextrin is completely dissolved, dropwise adding 1-1.8mL of ammonia water, and adjusting the pH value to about 10.
E. And D, adding 0.5-0.7 part of hydrazine hydrate into the solution in the step D, and stirring for about 30-35min. Stirring vigorously for 3.5-4h at 88-92 deg.C under oil bath condition, after reaction,
F. and E, washing the product obtained in the step E for 3-5 times by using warm water at the temperature of 30-40 ℃, and drying in an oven for 12-13h at the temperature of 58-62 ℃ to obtain 0.3-0.4 part of hydrophilic modified carbon nano tube product.
8. A method for preparing a long-acting dripping and defogging agricultural functional film according to any one of claims 1 to 6, wherein the method comprises the following steps:
s1, weighing 80-120 parts of linear low-density polyethylene, 20-40 parts of low-density polyethylene and 10-12 parts of hydrotalcite according to a ratio, and drying and pretreating the ingredients in an oven at 50-55 ℃ before use;
s2, weighing 1.5-2 parts of tea polyphenol with the mass fraction of 99%, 2.5-3 parts of hindered amine light stabilizer and 7.5-10 parts of lubricant calcium stearate according to the proportion; 3.5-5 parts of caprolactam serving as a plasticizer, 5-10 parts of an anti-fogging slow-release agent and the raw materials in the step S1 are added into a high-speed kneader to be fully mixed into slurry, and then the slurry flows into a slurry containing barrel and is poured into a hopper of an extruder set;
s3, pouring the material obtained in the step S2 into a single-screw extruder for melting and plasticizing, and then extruding and molding through a film blowing machine head; introducing compressed air after extrusion, blowing the compressed air, and starting a traction roller to draw and stretch the film bubble; starting a fan to blow cold air to the surface of the film, and slowly cooling the film bubble until the film bubble is cooled and shaped; pressing and laminating the film bubble by using a herringbone plate, then drawing by using a drawing roller, automatically winding the product by using a winding machine, and cutting off redundant edges to obtain an agricultural film;
s4, weighing 0.7-1.1 parts of nano zinc oxide according to the proportion, pouring the nano zinc oxide into a magnetic stirrer containing 13-15 parts of deionized water, heating the nano zinc oxide in a water bath at 45-55 ℃, and fully stirring the nano zinc oxide for 20-25min to form solution A;
s5, weighing 0.8-1 part of dispersing agent and 0.3-0.4 part of hydrophilic modified carbon nano tube, pouring into 6-8.5 parts of silicon dioxide sol, and fully stirring for 30-35min to form a solution B;
and S6, slowly pouring the solution B in the step S5 into the solution A in the step S4, adding 5-8 parts of deionized water for dilution, and stirring for 15-20min to form stable dispersion liquid, thereby preparing the super-hydrophilic anti-fog drip agent.
S7, cutting the agricultural film prepared in the step S3 according to actual size requirements, fixing the agricultural film on a vertically placed glass plate, uniformly spraying the super-hydrophilic anti-fog dripping agent prepared in the step S6 on the agricultural film by using a sprayer, pushing and pulling the sprayer for 15-20 times, and drying in a drying box at the room temperature of 30-35 ℃ for 8-10 hours to obtain the long-acting dripping fog-dissipation agricultural functional film.
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