CN117981614A - Temperature-control agricultural mulching film and preparation method thereof - Google Patents
Temperature-control agricultural mulching film and preparation method thereof Download PDFInfo
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- CN117981614A CN117981614A CN202311743122.5A CN202311743122A CN117981614A CN 117981614 A CN117981614 A CN 117981614A CN 202311743122 A CN202311743122 A CN 202311743122A CN 117981614 A CN117981614 A CN 117981614A
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- sodium carbonate
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- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 45
- 239000011358 absorbing material Substances 0.000 claims abstract description 16
- 238000000034 method Methods 0.000 claims abstract description 16
- 238000005516 engineering process Methods 0.000 claims abstract description 10
- 230000000694 effects Effects 0.000 claims abstract description 9
- 238000004519 manufacturing process Methods 0.000 claims abstract description 8
- 238000005286 illumination Methods 0.000 claims abstract description 7
- 239000000126 substance Substances 0.000 claims abstract description 7
- 238000009833 condensation Methods 0.000 claims abstract description 4
- 230000005494 condensation Effects 0.000 claims abstract description 4
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 44
- 239000000463 material Substances 0.000 claims description 23
- 229940001593 sodium carbonate Drugs 0.000 claims description 22
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 22
- 239000002245 particle Substances 0.000 claims description 19
- 239000004594 Masterbatch (MB) Substances 0.000 claims description 16
- 238000002834 transmittance Methods 0.000 claims description 11
- 238000002844 melting Methods 0.000 claims description 8
- 230000008018 melting Effects 0.000 claims description 8
- 239000002994 raw material Substances 0.000 claims description 7
- 239000002250 absorbent Substances 0.000 claims description 6
- 238000010096 film blowing Methods 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 5
- 230000004888 barrier function Effects 0.000 claims description 4
- 238000007664 blowing Methods 0.000 claims description 4
- 238000000227 grinding Methods 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 4
- 229920001684 low density polyethylene Polymers 0.000 claims description 4
- 239000004702 low-density polyethylene Substances 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- 239000000843 powder Substances 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims description 4
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims description 3
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims description 3
- XYQRXRFVKUPBQN-UHFFFAOYSA-L Sodium carbonate decahydrate Chemical compound O.O.O.O.O.O.O.O.O.O.[Na+].[Na+].[O-]C([O-])=O XYQRXRFVKUPBQN-UHFFFAOYSA-L 0.000 claims description 3
- 239000001110 calcium chloride Substances 0.000 claims description 3
- 229910001628 calcium chloride Inorganic materials 0.000 claims description 3
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 3
- 239000000292 calcium oxide Substances 0.000 claims description 3
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 3
- 238000002955 isolation Methods 0.000 claims description 3
- 229940018038 sodium carbonate decahydrate Drugs 0.000 claims description 3
- 229910052938 sodium sulfate Inorganic materials 0.000 claims description 3
- 235000011152 sodium sulphate Nutrition 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 2
- 238000001816 cooling Methods 0.000 abstract description 6
- 239000002362 mulch Substances 0.000 abstract description 5
- 239000002985 plastic film Substances 0.000 abstract description 2
- 229920006255 plastic film Polymers 0.000 abstract description 2
- 239000011324 bead Substances 0.000 abstract 1
- 239000000047 product Substances 0.000 description 6
- 239000004342 Benzoyl peroxide Substances 0.000 description 4
- OMPJBNCRMGITSC-UHFFFAOYSA-N Benzoylperoxide Chemical compound C=1C=CC=CC=1C(=O)OOC(=O)C1=CC=CC=C1 OMPJBNCRMGITSC-UHFFFAOYSA-N 0.000 description 4
- 235000019400 benzoyl peroxide Nutrition 0.000 description 4
- 239000004417 polycarbonate Substances 0.000 description 4
- 229920000515 polycarbonate Polymers 0.000 description 4
- 238000004321 preservation Methods 0.000 description 4
- 239000004745 nonwoven fabric Substances 0.000 description 3
- 229920000747 poly(lactic acid) Polymers 0.000 description 3
- 239000004626 polylactic acid Substances 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 239000002689 soil Substances 0.000 description 3
- 229920005992 thermoplastic resin Polymers 0.000 description 3
- 238000009423 ventilation Methods 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 239000002202 Polyethylene glycol Substances 0.000 description 2
- WNLRTRBMVRJNCN-UHFFFAOYSA-L adipate(2-) Chemical compound [O-]C(=O)CCCCC([O-])=O WNLRTRBMVRJNCN-UHFFFAOYSA-L 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000007334 copolymerization reaction Methods 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 229920002681 hypalon Polymers 0.000 description 2
- 230000008635 plant growth Effects 0.000 description 2
- 229920001223 polyethylene glycol Polymers 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 239000011342 resin composition Substances 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 1
- NPLRPKYYUCHQBF-UHFFFAOYSA-N C=Cc1ccccc1.OCCCOC(=O)C=C Chemical compound C=Cc1ccccc1.OCCCOC(=O)C=C NPLRPKYYUCHQBF-UHFFFAOYSA-N 0.000 description 1
- 241000252254 Catostomidae Species 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical group C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- CQEYYJKEWSMYFG-UHFFFAOYSA-N butyl acrylate Chemical compound CCCCOC(=O)C=C CQEYYJKEWSMYFG-UHFFFAOYSA-N 0.000 description 1
- TUZBYYLVVXPEMA-UHFFFAOYSA-N butyl prop-2-enoate;styrene Chemical compound C=CC1=CC=CC=C1.CCCCOC(=O)C=C TUZBYYLVVXPEMA-UHFFFAOYSA-N 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000010101 extrusion blow moulding Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000012010 growth Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 239000005001 laminate film Substances 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 238000010526 radical polymerization reaction Methods 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 239000000052 vinegar Substances 0.000 description 1
- 235000021419 vinegar Nutrition 0.000 description 1
- 238000009333 weeding Methods 0.000 description 1
Classifications
-
- 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
- A01G13/00—Protecting plants
- A01G13/02—Protective coverings for plants; Coverings for the ground; Devices for laying-out or removing coverings
- A01G13/0256—Ground coverings
- A01G13/0268—Mats or sheets, e.g. nets or fabrics
- A01G13/0275—Films
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D7/00—Producing flat articles, e.g. films or sheets
- B29D7/01—Films or sheets
-
- 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
-
- 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
- C08J2323/06—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
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
- C08K2003/265—Calcium, strontium or barium carbonate
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Medicinal Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- General Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental Sciences (AREA)
- Protection Of Plants (AREA)
Abstract
The temperature-controlled agricultural mulch film and its preparation method are production technology of the plastic film of controllable temperature, it has overcome the difficult problems such as not having cooling sunshade effect, cost are higher, manufacturing process are complicated in other technologies at present, it is by utilizing the principle that the water-absorbing material releases water automatically at the high temperature, form the steam condensation water bead at the top in the middle of two-layer film, turn transparent film into opaque, reduce the illumination to reduce the temperature; when the temperature is reduced, the water drops are absorbed by the water absorbing substance to become transparent. The method can also be used in combination with other temperature control techniques to facilitate or control the high temperature.
Description
Technical Field
The invention relates to a production technology of a temperature-controllable plastic film, in particular to a temperature-controllable agricultural mulching film and a preparation method thereof.
Background
The agricultural film and the mulching film can control heat dissipation in the use process, increase the temperature in the film and have the heat preservation function. But in the high-temperature season in summer, the soil temperature is too high, which prevents the growth of plants, and can achieve less sunshade and cooling. The milky adhesive sun-shading agent is sprayed on the agricultural film to reduce illumination and temperature, so that the action time is not long, insufficient illumination can be caused in winter, and the growth of plants is affected.
Other technologies have been proposed, and some problems exist, such as a preparation method of a degradable mulching film for heat preservation and water control of CN 107254150A. The invention discloses a preparation method of a degradable mulching film for heat preservation and water control, which comprises the following steps: 1. selecting raw materials, wherein the raw materials comprise polylactic acid, polycarbonate, polyethylene glycol adipate and a grafted compatibilizer in mass fraction; 2. firstly, baking polylactic acid and polycarbonate step by step in a vacuum environment; 3. the polylactic acid, the polyethylene glycol adipate and the grafted compatibilizer are put into a stirrer according to the weight ratio for stirring; 4. putting the uniformly mixed raw materials into a melting granulator for first melting copolymerization; 5. putting the product A particles and the baked polycarbonate into a stirrer to be uniformly stirred, and putting the stirred product A particles and the baked polycarbonate into a melting granulator again to carry out second melting copolymerization; 6. transferring the product B particles to a film blowing machine for film blowing operation, and preparing a mulching film; 7. and detecting the strength of the prepared mulching film finished product. The invention has higher degradation rate, higher overall mechanical property and better water retention, but the manufacturing process is more complex, and only has the heat preservation function.
Also a smart microporous mulch film, such as a CN101990836B smart microporous temperature-controlled breathable mulch film. The invention provides an intelligent microporous temperature-control breathable mulching film which comprises a non-woven fabric, strip-shaped pore canals positioned on the non-woven fabric, an intelligent moisture regulator inlaid in the center of the pore canals, and suckers arranged on the bottom surface of the non-woven fabric at intervals. The mulching film is thinner in thickness, light in weight, convenient to transport and construct, low in price, easy to popularize, strong in self-adaption under the pad during use, capable of improving moisture penetration and reducing moisture evaporation, effectively reducing production management cost in the fields of agriculture, forestry and the like, and capable of utilizing water resources efficiently and saving chemical utilization. The method is mainly used in the fields of agriculture, forestry and the like. The mulching film can intelligently control the temperature, but has complex process and high cost.
CN217608641U is a high-strength mulching film with good temperature control. The invention provides a high-strength mulching film with good temperature control, which comprises a light-color mulching film and a black mulching film, wherein: the two ends of the light-colored mulching film are respectively connected with a black mulching film, the connection parts of the light-colored mulching film and the black mulching film are respectively provided with a longitudinal mechanical area, and the light-colored mulching film is provided with a transverse mechanical area; the light-colored mulching film is an infrared blocking mulching film, is convenient for crops to receive illumination, has small day-night temperature difference, and can achieve the weeding effect to a certain extent. The invention uses infrared blocking to reduce the temperature difference to a certain extent.
A preparation method of a CN114793722B supported negative heat material regulated breathable drop-free mulching film. The invention provides a breathable drip-free mulch film regulated by a load type negative thermal material, wherein a mask layer, a temperature-adjustable ventilation layer and a hydrophilic layer are sequentially arranged from top to bottom, ventilation holes are distributed in the mask layer, the temperature-adjustable ventilation layer is composed of butyl acrylate styrene chlorosulfonated polyethylene copolymer composite negative thermal material, the negative thermal material is ZrW2O8 loaded with benzoyl peroxide, and the hydrophilic layer is composed of hydroxypropyl acrylate-styrene chlorosulfonated polyethylene polyvinyl alcohol copolymer. The prepared mulching film has the functions of improving the concentration of carbon dioxide gas and reducing the concentration of ammonia gas in a mulching film covered space, meanwhile, no obvious water drops are formed on the inner surface of the mulching film, and the higher soil temperature can be maintained. The negative thermal material in the temperature-adjustable air exchange layer is ZrW2O8 loaded with benzoyl peroxide, and the benzoyl peroxide can trigger an organic monomer with double bonds to generate a free radical polymerization reaction, so that the ZrW2O8 loaded with benzoyl peroxide can trigger butyl acrylate vinegar and styrene monomer to polymerize on the surface of the negative thermal material particles to form a layer of compact polymer shell with certain strength, which is coated on the surface of the negative thermal material particles, thereby being beneficial to forming temperature-adjustable pores in the air exchange layer. The invention uses the load type negative thermal material to generate relative strain, thereby forming a gap to achieve the purpose of gas exchange, but the process is relatively complex.
JP2001078591AFilm for A shows an agricultural film which can automatically control its light transmittance according to the amount of sunlight by making a water-insoluble or slightly water-soluble thermoplastic resin such as polyvinyl chloride resin containing 100 parts by weight of a resin composition and 0.001 to 10 parts by weight of a photochromic compound, and is preferably a laminate film by extrusion molding, blow molding or calender molding. Has excellent durability, and by treating a resin composition comprising a thermoplastic resin, crops can be effectively cultivated in a greenhouse or the like. Such as the ratio of the water-insoluble thermoplastic resin and the photochromic compound to the extrusion molding method, etc.
In conclusion, the preparation of the mulching film with cooling and sun-shading effects for controlling Wen Nong has not been found.
Disclosure of Invention
The invention aims to provide a temperature-control agricultural mulching film and a preparation method thereof, which overcome the problems of no cooling and sun-shading effects, higher cost, complex manufacturing process and the like existing in other technologies at present; when the temperature is reduced, the water drops are absorbed by the water absorbing substance to become transparent. The method can also be used in combination with other temperature control techniques to facilitate or control the high temperature.
The composite cooling agricultural mulch film consists of two or more layers of water-absorbing substances sandwiched between the two layers. The two layers are provided with grids which divide the water-absorbing material into small areas for isolation. The water-absorbing material can be added into the middle layer by multilayer coextrusion technology, or the water-absorbing material is filled into the middle layer by blowing film and then hot-laminating.
One surface of the two layers is an upward layer, and the other surface is a downward layer. The upper layer faces the sky (sun), the lower layer faces the ground, the barrier effect of the upper layer on water is larger than that of the lower layer, and the barrier effect can be realized by adjusting the thickness or the material of the upper layer and the lower layer. The purpose is to allow the water on the ground to penetrate into the middle through the lower layer, so that the water-absorbing material can fully absorb water.
The water absorbing material includes, but is not limited to, sodium carbonate, sodium sulfate, calcium chloride, calcium oxide or mixtures thereof, preferably sodium carbonate, because sodium carbonate decahydrate has a water loss temperature of 33.5 ℃, above which most crops will not grow properly.
The meaning of the invention is as follows: firstly, the invention utilizes the water absorbing material in the middle layer of the agricultural mulching film to automatically release water at high temperature, forms steam condensation water drops at the top of the middle of the two layers of films, changes the transparent film into opaque film to reduce illumination, reduce temperature and achieve the effects of cooling and sunshading; fills a large gap of the application performance of the agricultural mulching film and has great market value; secondly, the recycling rate is high, the service life is long, and water on the ground can permeate into the middle through the lower layer, so that the water-absorbing material fully absorbs water to increase the recycling property of the water-absorbing material; thirdly, the application process method is simple to operate, low in cost and convenient to popularize; fourth, green, the composition can not influence soil oneself, and the temperature of control is favorable to the growth of most crops.
Drawings
Fig. 1 is a schematic diagram of the principle and implementation process.
FIG. 2 is a table of a blank group according to the present invention.
Detailed Description
According to the invention, by utilizing the principle that the water absorbing material automatically releases water at high temperature, steam condensation water drops are formed at the top of the middle of the two films, so that the transparent film is changed into opaque, and the illumination temperature is reduced; when the temperature is reduced, the water drops are absorbed by the water absorbing substance to become transparent.
The invention is composed of two or more layers of water absorbing materials which are clamped in the middle; the two layers are provided with grids, the grids divide the water-absorbent material into small areas for isolation, the water-absorbent material can be added into the middle layer through a multilayer coextrusion technology, or the water-absorbent material is filled into the middle layer by blowing a film and then hot-sealing; one surface of the two layers is an upward layer, and the other surface is a downward layer; when the solar water heater is used, the upper layer faces the sky (sun), the lower layer faces the ground, the barrier effect of the upper layer on water is larger than that of the lower layer, and the water heater can be realized by adjusting the thickness or the material of the upper layer and the lower layer; the purpose is to allow the water on the ground to penetrate into the middle through the lower layer, so that the water-absorbing material can fully absorb water.
The water absorbing material includes, but is not limited to, sodium carbonate, sodium sulfate, calcium chloride, calcium oxide or mixtures thereof, preferably sodium carbonate, because sodium carbonate decahydrate has a water loss temperature of 33.5 ℃, above which most crops will not grow properly.
The preparation method comprises grinding sodium carbonate solid into fine powder of 0.001-0.003 mm, preparing master batch particles containing 25-35% sodium carbonate, and melting the other 65-75% materials into common low density polyethylene particles (7050 for Chinese petrochemical industry) by heating to 200deg.C, and then drawing and granulating; before entering a film blowing machine, a stirrer is used for stirring the master batch and other main materials for more than 8 minutes so as to uniformly distribute sodium carbonate particles in the master batch, the addition of the master batch in the middle layer is controlled, the content of sodium carbonate in the middle layer is controlled to be 8-10%, other raw materials in the middle layer are 7050, other layers are 7050 with 100%, the temperature of three sections of screws is respectively 200-220-240 ℃, the temperature of a die head is 225-230 ℃, films with the thickness of 0.008-0.12 mm are normally blown, the thickness of an upper layer is higher than that of a lower layer, and the film is normally used in a field.
Further, grinding the sodium carbonate solid into fine powder of 0.002mm, then manufacturing into master batch particles containing 30% of sodium carbonate, wherein the other 70% of the master batch particles are common low-density polyethylene particles (7050 for Chinese petrochemical industry), heating to 200 ℃ for melting, and then drawing and granulating; before entering a film blowing machine, a stirrer is used for stirring the master batch and other main materials for more than 8 minutes so as to uniformly distribute sodium carbonate particles, the master batch is added in a middle layer, the sodium carbonate content in the middle layer is controlled to be 9%, other raw materials in the middle layer are 7050, other layers are 7050 with 100%, the temperature of three sections of screws is 200 ℃, 220 ℃, 240 ℃, 227 ℃ and the die head temperature are respectively, a film with the thickness of 0.08mm is normally blown, the thickness of the upper layer is 0.05mm, the thickness of the middle layer is 0.02mm, the thickness of the lower layer is 0.01mm, and the film is normally used in a field.
In the use process of the product, the temperature, the haze and the light transmittance of the inner side and the outer side of the film are respectively detected, and a blank control group is arranged; the light transmittance and haze test adopts a WGT-S light transmittance/haze tester; in the use process of the product, the temperature, the haze and the light transmittance of the inner side and the outer side of the film are respectively detected, and a blank control group is arranged; when in use, the higher the temperature outside the film, the lower the light transmittance, and the higher the haze, the lower the temperature inside the film compared with the control group without using the technology.
The above technical solution only represents the preferred technical solution of the present invention, and some changes that may be made by those skilled in the art to some parts of the technical solution can represent the principle of the present invention, which all fall within the protection scope of the present invention.
Claims (5)
1. A temperature-control agricultural mulching film and a preparation method thereof are characterized in that: the principle that a water absorbing substance automatically releases water at high temperature is utilized to form steam condensation water drops at the top of the middle of two layers of films, so that a transparent film is changed into opaque, and the illumination is reduced to reduce the temperature; when the temperature is reduced, the water drops are absorbed by the water absorbing substance to become transparent.
2. The temperature-control agricultural mulching film and the preparation method thereof according to claim 1 are characterized in that: it is composed of two or more layers of water-absorbing materials which are sandwiched between two or more layers; the two layers are provided with grids, the grids divide the water-absorbent material into small areas for isolation, the water-absorbent material can be added into the middle layer through a multilayer coextrusion technology, or the water-absorbent material is filled into the middle layer by blowing a film and then hot-sealing; one surface of the two layers is an upward layer, and the other surface is a downward layer; when the solar water heater is used, the upper layer faces the sky (sun), the lower layer faces the ground, the barrier effect of the upper layer on water is larger than that of the lower layer, and the water heater can be realized by adjusting the thickness or the material of the upper layer and the lower layer; the purpose is to allow the water on the ground to penetrate into the middle through the lower layer, so that the water-absorbing material can fully absorb water.
3. The temperature-control agricultural mulching film and the preparation method thereof according to claim 2 are characterized in that: the water absorbing material includes, but is not limited to, sodium carbonate, sodium sulfate, calcium chloride, calcium oxide or mixtures thereof, preferably sodium carbonate, because sodium carbonate decahydrate has a water loss temperature of 33.5 ℃, above which most crops will not grow properly.
4. The temperature-control agricultural mulching film and the preparation method thereof according to claim 3, wherein the temperature-control agricultural mulching film is characterized in that: grinding sodium carbonate solid into fine powder of 0.001-0.003 mm, preparing master batch particles containing 25-35% sodium carbonate, wherein the other 65-75% materials are common low density polyethylene particles (7050 for Chinese petrochemical industry), heating to 200 ℃ for melting, and then drawing and granulating; stirring the master batch and other main materials by using a stirrer for more than 8 minutes before entering a film blowing machine so as to uniformly distribute sodium carbonate particles in the master batch, adding the master batch in a middle layer, controlling the content of sodium carbonate in the middle layer to be 8-10%, controlling other raw materials in the middle layer to be 7050, controlling other layers to be 7050 in 100%, and normally blowing a film with the thickness of an upper layer higher than that of a lower layer and the temperature of a die head to be 225-230 ℃ at 200-220 ℃ respectively for three sections of screw rods for normal field use;
Further, grinding the sodium carbonate solid into fine powder of 0.002mm, then manufacturing into master batch particles containing 30% of sodium carbonate, wherein the other 70% of the master batch particles are common low-density polyethylene particles (7050 for Chinese petrochemical industry), heating to 200 ℃ for melting, and then drawing and granulating; before entering a film blowing machine, a stirrer is used for stirring the master batch and other main materials for more than 8 minutes so as to uniformly distribute sodium carbonate particles, the master batch is added in a middle layer, the sodium carbonate content in the middle layer is controlled to be 9%, other raw materials in the middle layer are 7050, other layers are 7050 with 100%, the temperature of three sections of screws is 200 ℃, 220 ℃, 240 ℃, 227 ℃ and the die head temperature are respectively, a film with the thickness of 0.08mm is normally blown, the thickness of the upper layer is 0.05mm, the thickness of the middle layer is 0.02mm, the thickness of the lower layer is 0.01mm, and the film is normally used in a field.
5. The temperature-control agricultural mulching film and the preparation method thereof according to claim 1 are characterized in that: in the use process, the temperature, the haze and the light transmittance of the inner side and the outer side of the film are respectively detected, and a blank control group is arranged; the light transmittance and haze test adopts a WGT-S light transmittance/haze tester; in the use process of the product, the temperature, the haze and the light transmittance of the inner side and the outer side of the film are respectively detected, and a blank control group is arranged; when in use, the higher the temperature outside the film, the lower the light transmittance, and the higher the haze, the lower the temperature inside the film compared with the control group without using the technology.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311743122.5A CN117981614A (en) | 2023-12-18 | 2023-12-18 | Temperature-control agricultural mulching film and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311743122.5A CN117981614A (en) | 2023-12-18 | 2023-12-18 | Temperature-control agricultural mulching film and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117981614A true CN117981614A (en) | 2024-05-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311743122.5A Pending CN117981614A (en) | 2023-12-18 | 2023-12-18 | Temperature-control agricultural mulching film and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117981614A (en) |
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2023
- 2023-12-18 CN CN202311743122.5A patent/CN117981614A/en active Pending
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