CN115304805A - Preparation method of agricultural film with temperature adjusting function - Google Patents
Preparation method of agricultural film with temperature adjusting function Download PDFInfo
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- CN115304805A CN115304805A CN202210980744.9A CN202210980744A CN115304805A CN 115304805 A CN115304805 A CN 115304805A CN 202210980744 A CN202210980744 A CN 202210980744A CN 115304805 A CN115304805 A CN 115304805A
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- film
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- 238000002360 preparation method Methods 0.000 title claims abstract description 19
- 238000009987 spinning Methods 0.000 claims abstract description 45
- 239000000835 fiber Substances 0.000 claims abstract description 26
- 239000012792 core layer Substances 0.000 claims abstract description 25
- 239000012782 phase change material Substances 0.000 claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000000203 mixture Substances 0.000 claims abstract description 16
- 239000002904 solvent Substances 0.000 claims abstract description 15
- 239000010410 layer Substances 0.000 claims abstract description 13
- 230000008859 change Effects 0.000 claims abstract description 12
- 238000002156 mixing Methods 0.000 claims abstract description 12
- 229910017053 inorganic salt Inorganic materials 0.000 claims abstract description 11
- 239000008367 deionised water Substances 0.000 claims abstract description 10
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 10
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 10
- 239000010935 stainless steel Substances 0.000 claims abstract description 10
- 239000000463 material Substances 0.000 claims abstract description 9
- 239000011258 core-shell material Substances 0.000 claims abstract description 7
- 238000010041 electrostatic spinning Methods 0.000 claims abstract description 5
- 239000002994 raw material Substances 0.000 claims abstract description 5
- 238000003756 stirring Methods 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 14
- 239000007788 liquid Substances 0.000 claims description 8
- 238000004321 preservation Methods 0.000 claims description 7
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- 238000011049 filling Methods 0.000 claims description 4
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- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 claims description 2
- 229910052757 nitrogen Inorganic materials 0.000 claims description 2
- 239000011574 phosphorus Substances 0.000 claims description 2
- 229910052698 phosphorus Inorganic materials 0.000 claims description 2
- 239000002861 polymer material Substances 0.000 claims description 2
- 239000011591 potassium Substances 0.000 claims description 2
- 229910052700 potassium Inorganic materials 0.000 claims description 2
- 229920003169 water-soluble polymer Polymers 0.000 claims description 2
- 239000010408 film Substances 0.000 description 31
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- 230000008569 process Effects 0.000 description 5
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- ZZNDQCACFUJAKJ-UHFFFAOYSA-N 1-phenyltridecan-1-one Chemical compound CCCCCCCCCCCCC(=O)C1=CC=CC=C1 ZZNDQCACFUJAKJ-UHFFFAOYSA-N 0.000 description 1
- QZCLKYGREBVARF-UHFFFAOYSA-N Acetyl tributyl citrate Chemical compound CCCCOC(=O)CC(C(=O)OCCCC)(OC(C)=O)CC(=O)OCCCC QZCLKYGREBVARF-UHFFFAOYSA-N 0.000 description 1
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 1
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- CJZGTCYPCWQAJB-UHFFFAOYSA-L calcium stearate Chemical compound [Ca+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O CJZGTCYPCWQAJB-UHFFFAOYSA-L 0.000 description 1
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- 150000001875 compounds Chemical class 0.000 description 1
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- VOZRXNHHFUQHIL-UHFFFAOYSA-N glycidyl methacrylate Chemical compound CC(=C)C(=O)OCC1CO1 VOZRXNHHFUQHIL-UHFFFAOYSA-N 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 229920001903 high density polyethylene Polymers 0.000 description 1
- 239000004700 high-density polyethylene Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
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- 230000014759 maintenance of location Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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- 239000012074 organic phase Substances 0.000 description 1
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- 229920000747 poly(lactic acid) Polymers 0.000 description 1
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- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920000570 polyether Polymers 0.000 description 1
- 239000004626 polylactic acid Substances 0.000 description 1
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- -1 polypropylene Polymers 0.000 description 1
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- 230000008092 positive effect Effects 0.000 description 1
- 239000001103 potassium chloride Substances 0.000 description 1
- 235000011164 potassium chloride Nutrition 0.000 description 1
- NNMHYFLPFNGQFZ-UHFFFAOYSA-M sodium polyacrylate Chemical compound [Na+].[O-]C(=O)C=C NNMHYFLPFNGQFZ-UHFFFAOYSA-M 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
- MEYZYGMYMLNUHJ-UHFFFAOYSA-N tunicamycin Natural products CC(C)CCCCCCCCCC=CC(=O)NC1C(O)C(O)C(CC(O)C2OC(C(O)C2O)N3C=CC(=O)NC3=O)OC1OC4OC(CO)C(O)C(O)C4NC(=O)C MEYZYGMYMLNUHJ-UHFFFAOYSA-N 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Images
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
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/0007—Electro-spinning
- D01D5/0015—Electro-spinning characterised by the initial state of the material
- D01D5/003—Electro-spinning characterised by the initial state of the material the material being a polymer solution or dispersion
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/0007—Electro-spinning
- D01D5/0061—Electro-spinning characterised by the electro-spinning apparatus
- D01D5/0092—Electro-spinning characterised by the electro-spinning apparatus characterised by the electrical field, e.g. combined with a magnetic fields, using biased or alternating fields
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/28—Formation of filaments, threads, or the like while mixing different spinning solutions or melts during the spinning operation; Spinnerette packs therefor
- D01D5/30—Conjugate filaments; Spinnerette packs therefor
- D01D5/34—Core-skin structure; Spinnerette packs therefor
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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
- C08J2363/00—Characterised by the use of epoxy resins; Derivatives of epoxy resins
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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
- C08J2369/00—Characterised by the use of polycarbonates; Derivatives of polycarbonates
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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
- 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
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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
- C08J2429/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal, or ketal radical; Hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Derivatives of such polymer
- C08J2429/02—Homopolymers or copolymers of unsaturated alcohols
- C08J2429/04—Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
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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
- C08J2467/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
- C08J2467/04—Polyesters derived from hydroxy carboxylic acids, e.g. lactones
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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
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- C08J2471/02—Polyalkylene oxides
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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
- C08J2497/00—Characterised by the use of lignin-containing materials
- C08J2497/02—Lignocellulosic material, e.g. wood, straw or bagasse
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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
Abstract
The invention discloses a preparation method of an agricultural film with a temperature adjusting function, which comprises the following steps: s1, mixing deionized water and inorganic salt according to a certain proportion to obtain a green solvent; s2, mixing the core layer phase-change material with a green solvent according to a certain proportion to obtain a core layer spinning solution; mixing a shell supporting material with deionized water according to a certain proportion to obtain a shell spinning solution; s3, connecting a core layer spinning solution injector with an inner needle of a stainless steel coaxial nozzle, connecting a shell layer spinning solution injector with an outer needle of the stainless steel coaxial nozzle, and spinning in an electrostatic spinning device to obtain the phase-change fiber with the core-shell structure; s4, preparing a film, adding the phase change fibers into the film raw materials, mixing to obtain a mixture, and adding the mixture into film making equipment to obtain the film. The preparation method of the agricultural film with the temperature adjusting function can solve the problems that the existing agricultural film is light-transmitting and air-permeable, and the preparation process is complex.
Description
Technical Field
The invention relates to the technical field of agricultural films, in particular to a preparation method of an agricultural film with a temperature adjusting function.
Background
In the face of the problem that the yield reduction of agricultural products is increasingly serious due to adverse factors such as climate change, environmental damage and the like, the improvement of the environmental temperature of the crop growth space is a key means for resisting the damage caused by external environmental change. Plastic film mulching is widely used for maintaining the temperature required during the growth of crops for planting, for example, a moisture retention film at the early stage of the growth of crops, a plastic film for greenhouse planting. Although plastic films produced by using polymer resin materials as main raw materials in the market at present have good heat preservation effect, the plastic films have the following problems: firstly, the controllability of the heat preservation process is poor, the temperature in a closed space formed by the plastic film is gradually increased under the irradiation of sunlight, and when the temperature is higher than the temperature required by crops, if the ventilation is not performed by human intervention, the temperature is too high, and the growth of the crops is influenced; secondly, the heat preservation process is discontinuous and is easily influenced by the external environment. Under the conditions of lack of sunlight or cold weather, the heat preservation effect of the plastic film is obviously reduced, soil heat can be dissipated through the plastic film to cause temperature reduction, for example, in greenhouse planting, in order to prevent the temperature from being greatly reduced at night, a heat preservation quilt is additionally covered outside the plastic film, and the complexity of the using process is increased.
The phase-change material absorbs or releases heat through self phase state transition, has the advantages of high energy storage density, constant phase-change temperature, stable performance, simplicity, easiness in control and the like, is an effective way for realizing temperature regulation and control, and has attracted extensive attention in the fields of electronic heat dissipation, intelligent fabrics, energy storage, building energy conservation and the like, so that the plastic film with the temperature regulation and control function prepared based on the phase-change material can make up the defects of the traditional plastic film. Utility model CN210328745U has disclosed a compound agricultural plastic film that contains phase change material, adopts two upper and lower tunic parcel phase change material layer's traditional mode preparation plastic film in the patent to be equipped with the fixed band in thin layer both sides and prevent that phase change material from taking place the side leakage. However, in practical applications, the damage of the thin film easily causes the loss of the phase change material during the phase change, thereby losing the temperature adjusting function; moreover, the light transmission and air permeability of the composite film containing the phase-change material interlayer are weakened, the preparation process is complicated, and the cost is increased.
Disclosure of Invention
The invention aims to provide a preparation method of an agricultural film with a temperature adjusting function, and solves the problems that the existing agricultural film is light-transmitting and air-permeable, and the preparation process is complex.
In order to realize the aim, the invention provides a preparation method of an agricultural film with a temperature adjusting function, which comprises the following steps:
s1, preparing a green solvent, mixing deionized water and inorganic salt according to a certain proportion, and uniformly stirring to obtain the green solvent;
s2, preparing a solution, mixing the core layer phase-change material with a green solvent according to a certain proportion, uniformly stirring, and then placing at room temperature to obtain a core layer spinning solution; mixing a shell supporting material with deionized water according to a certain proportion, uniformly stirring, and carrying out water bath treatment to obtain a shell spinning solution;
s3, preparing phase-change fibers, namely respectively filling a core layer spinning solution and a shell layer spinning solution into an injector, connecting the core layer spinning solution injector with an inner needle of a stainless steel coaxial nozzle, connecting the shell layer spinning solution injector with an outer needle of the stainless steel coaxial nozzle, and spinning in an electrostatic spinning device to obtain the phase-change fibers with the core-shell structure;
s4, preparing the film, adding the phase change fiber into the film raw material, mixing to obtain a mixture, and adding the mixture into film making equipment to obtain the film.
Preferably, in the S1, the inorganic salt is an inorganic salt containing nitrogen, phosphorus and potassium elements, and the mass percentage of the inorganic salt in the green solvent is 1-20%.
Preferably, in S2, the core layer phase change material is a water-soluble organic phase change material with a phase change temperature covering the growth temperature of the crops, and the mass percentage of the core layer phase change material in the core layer spinning solution is 30-60%.
Preferably, in the step S2, the shell supporting material is a water-soluble polymer material, and the mass percentage of the shell supporting material in the shell spinning solution is 8-10%.
Preferably, in the S2, the temperature of the water bath treatment is 90 ℃, and the heat preservation time is 2h.
Preferably, in S3, the spinning voltage of electrostatic spinning is 20kV, the liquid inlet speed of the shell spinning solution is 0.3mL/h, and the liquid inlet speed of the core spinning solution is 0.02-0.06mL/h.
Preferably, in the S4, the mass percentage of the phase-change fibers in the mixture is 5-20%.
The film can also be prepared by firstly preparing the film, covering the phase-change fibers on the surface of the film before the film is cooled, and then embedding the phase-change fibers into the film by means of extrusion or pressurization to realize bonding.
The preparation method of the agricultural film with the temperature adjusting function has the advantages and positive effects that:
1. the phase-change fiber is dissolved in the film raw material, so that the effective grafting of the phase-change material and the film is realized, the film is endowed with the temperature-regulating function while the air permeability and the light transmittance of the film are ensured, and the normal growth of crops is ensured.
2. The green solvent of the phase-change fiber is an inorganic salt aqueous solution, the inorganic salt aqueous solution has little pollution to the environment, and can provide required nutrient elements for the production of crops.
3. The phase change fiber is of a core-shell structure, has a better packaging effect, can effectively prevent loss of the phase change material, and prolongs the service life.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
FIG. 1 is an electron microscope photograph of phase change fibers of a first embodiment of a method for preparing an agricultural film with a temperature regulating function according to the present invention;
FIG. 2 is a diagram showing the temperature adjustment curve of phase change fibers during the temperature increase process according to the first embodiment of the method for preparing an agricultural film with a temperature adjustment function.
Detailed Description
The technical solution of the present invention is further illustrated by the accompanying drawings and examples.
Example one
S1, adding 2g of potassium chloride into 8g of deionized water to obtain a green solvent.
S2, 6g of polyethylene glycol (PEG 1000) is placed in a sealed glass container, a green solvent is poured into the container, magnetons are placed in the container, and then the container is placed on a magnetic stirrer, wherein the set rotating speed is 300r/min. Magnetically stirring at normal temperature for 3 hr to obtain homogeneous core layer spinning solution, and setting at room temperature for further use.
4g of polyvinyl alcohol 6 (PVA) was placed in a sealed glass vessel, 36g of deionized water was added, and magnetons were placed, followed by placing it on a magnetic stirrer set at 300r/min. Magnetically stirring at normal temperature for 3 hours, then moving the beaker into a water bath kettle, raising the temperature of the water bath from room temperature to 90 ℃, and preserving the temperature for 2 hours to obtain a uniform shell spinning solution, and placing the uniform shell spinning solution at room temperature for later use.
And S3, respectively filling the PEG core layer spinning solution prepared in the S2 and the PVA shell layer spinning solution prepared into a 10ml injector, wherein the injector filled with the PEG core layer spinning solution is connected with an inner needle of a stainless steel coaxial nozzle, and the injector filled with the PVA shell layer spinning solution is connected with an outer needle of the stainless steel coaxial nozzle. Setting the spinning voltage to be 20kV, the PVA liquid inlet speed to be 0.3mL/h and the PEG liquid inlet speed to be 0.04mL/h to obtain the phase-change fiber with the core-shell structure.
S4, heating and stirring 30g of epoxy resin, 25g of high-density polyethylene, 8g of calcium stearate, 12g of acetyl tributyl citrate, 15g of lauric diethanolamide, 10g of chlorinated polyether, 6g of glycidyl methacrylate, 12g of sodium polyacrylate, 5g of plasticizer, 5g of light stabilizer and 5g of antioxidant for 1 hour to obtain a mixture, adding 15g of prepared phase-change fiber into a stirring kettle, and continuously stirring until the mixture is uniform to obtain the mixture.
And adding the mixture into a film blow molding machine to prepare a plastic film, and standing the plastic film for 5 minutes at room temperature to cool and mold the plastic film.
FIG. 1 is an electron microscope photograph of phase change fibers in a first embodiment of a method for preparing an agricultural film with a temperature regulating function of the present invention. As shown in the figure, the phase-change fiber is of a core-shell structure with a shell layer coated outside a core layer, has a better packaging effect, can effectively prevent the loss of the phase-change material, and prolongs the service life.
FIG. 2 is a diagram showing the temperature-regulating curve of phase-change fibers during the temperature-raising process according to the first embodiment of the method for preparing an agricultural film with a temperature-regulating function of the present invention. As shown in the figure, the phase-change fiber has a good temperature adjusting function, and after being compounded with the film, the phase-change fiber can endow the film with the temperature adjusting function, so that the normal growth of crops is ensured.
Example two
S1, adding 1g of ammonia chloride into 12g of deionized water to obtain a green solvent.
S2, putting 12g of polyethylene glycol (PEG 1000) into a sealed glass container, pouring a green solvent into the container, putting magnetons into the container, and then putting the container on a magnetic stirrer at a set rotating speed of 300r/min. Magnetically stirring at normal temperature for 3 hr to obtain homogeneous core layer spinning solution, and setting at room temperature for further use.
S2, 4g of polyvinyl alcohol 6 (PVA) is placed in a sealed glass container, 45g of deionized water is added, magnetons are placed in the container, and then the container is placed on a magnetic stirrer, and the set rotating speed is 300r/min. Magnetically stirring at normal temperature for 3 hours, then transferring the beaker into a water bath kettle, raising the temperature of the water bath from room temperature to 90 ℃, preserving the heat for 2 hours to obtain a uniform shell spinning solution, and placing the uniform shell spinning solution at room temperature for later use.
And S3, respectively filling the PEG core layer spinning solution prepared in the S2 and the PVA shell layer spinning solution prepared in the S2 into a 10ml injector, connecting the injector filled with the PEG core layer spinning solution to an inner needle of a stainless steel coaxial spray head, and connecting the injector filled with the PVA shell layer spinning solution to an outer needle of the stainless steel coaxial spray head. Setting the spinning voltage to be 20kV, the PVA liquid inlet speed to be 0.3ml/h and the PEG liquid inlet speed to be 0.06ml/h to obtain the phase-change fiber with the core-shell structure.
S4, heating and stirring 15g of polylactic acid, 7g of lignocellulose, 10g of PLAT, 16g of polycarbonate, 15g of low-density polyethylene, 6g of polypropylene cellulose, 7g of calcium carbonate, 5g of cross-linking agent, 5g of light stabilizer and 5g of antioxidant for 1 hour to obtain a mixture, adding 10g of prepared phase-change fiber into a stirring kettle, and continuously stirring until the mixture is uniform to obtain the mixture.
And adding the mixture into a double-screw extruder to prepare a plastic film, and standing the plastic film for 5 minutes at room temperature to cool and form the plastic film.
Therefore, the preparation method of the agricultural film with the temperature adjusting function can solve the problems of light transmission and air permeability reduction and complex preparation process of the existing agricultural film.
Finally, it should be noted that: the above embodiments are only intended to illustrate the technical solution of the present invention and not to limit the same, and although the present invention is described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the disclosed embodiments without departing from the spirit and scope of the present invention.
Claims (7)
1. A preparation method of an agricultural film with a temperature adjusting function is characterized by comprising the following steps: the method comprises the following steps:
s1, preparing a green solvent, mixing deionized water and inorganic salt according to a certain proportion, and uniformly stirring to obtain the green solvent;
s2, preparing a solution, mixing the core layer phase-change material with a green solvent according to a certain proportion, uniformly stirring, and then placing at room temperature to obtain a core layer spinning solution; mixing a shell supporting material with deionized water according to a certain proportion, uniformly stirring, and carrying out water bath treatment to obtain a shell spinning solution;
s3, preparing phase-change fibers, namely respectively filling a core layer spinning solution and a shell layer spinning solution into an injector, connecting the core layer spinning solution injector with an inner needle of a stainless steel coaxial nozzle, connecting the shell layer spinning solution injector with an outer needle of the stainless steel coaxial nozzle, and spinning in an electrostatic spinning device to obtain the phase-change fibers with the core-shell structure;
s4, preparing the film, adding the phase change fiber into the film raw material, mixing to obtain a mixture, and adding the mixture into film making equipment to obtain the film.
2. The method for preparing the agricultural film with the temperature adjusting function according to claim 1, which is characterized by comprising the following steps: in the S1, the inorganic salt is an inorganic salt containing nitrogen, phosphorus and potassium elements, and the mass percent of the inorganic salt in the green solvent is 1-20%.
3. The preparation method of the agricultural film with the temperature adjusting function as claimed in claim 1, wherein the preparation method comprises the following steps: in S2, the core layer phase-change material is a water-soluble organic phase-change material with the phase-change temperature covering the growth temperature of crops, and the mass percentage of the core layer phase-change material in the core layer spinning solution is 30-60%.
4. The method for preparing the agricultural film with the temperature adjusting function according to claim 1, which is characterized by comprising the following steps: in the S2, the shell supporting material is a water-soluble polymer material, and the mass percentage of the shell supporting material in the shell spinning solution is 8-10%.
5. The preparation method of the agricultural film with the temperature adjusting function as claimed in claim 1, wherein the preparation method comprises the following steps: in the S2, the water bath treatment temperature is 90 ℃, and the heat preservation time is 2h.
6. The method for preparing the agricultural film with the temperature adjusting function according to claim 1, which is characterized by comprising the following steps: in S3, the spinning voltage of electrostatic spinning is 20kV, the liquid inlet speed of the shell layer spinning solution is 0.3mL/h, and the liquid inlet speed of the core layer spinning solution is 0.02-0.06mL/h.
7. The method for preparing the agricultural film with the temperature adjusting function according to claim 1, which is characterized by comprising the following steps: in S4, the mass percent of the phase-change fibers in the mixture is 5-20%.
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