CN117264309A - Natural full-biodegradation polyethylene mulching film and preparation method thereof - Google Patents
Natural full-biodegradation polyethylene mulching film and preparation method thereof Download PDFInfo
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- CN117264309A CN117264309A CN202311567872.1A CN202311567872A CN117264309A CN 117264309 A CN117264309 A CN 117264309A CN 202311567872 A CN202311567872 A CN 202311567872A CN 117264309 A CN117264309 A CN 117264309A
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- -1 polyethylene Polymers 0.000 title claims abstract description 52
- 239000004698 Polyethylene Substances 0.000 title claims abstract description 36
- 229920000573 polyethylene Polymers 0.000 title claims abstract description 36
- 238000002360 preparation method Methods 0.000 title description 10
- 238000006065 biodegradation reaction Methods 0.000 title description 2
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims abstract description 75
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims abstract description 60
- 239000002362 mulch Substances 0.000 claims abstract description 51
- 229920001661 Chitosan Polymers 0.000 claims abstract description 47
- 239000004372 Polyvinyl alcohol Substances 0.000 claims abstract description 42
- 229920002451 polyvinyl alcohol Polymers 0.000 claims abstract description 42
- XHQSLVIGPHXVAK-UHFFFAOYSA-K iron(3+);octadecanoate Chemical compound [Fe+3].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O XHQSLVIGPHXVAK-UHFFFAOYSA-K 0.000 claims abstract description 23
- 239000004014 plasticizer Substances 0.000 claims abstract description 22
- 239000005995 Aluminium silicate Substances 0.000 claims abstract description 20
- SXRSQZLOMIGNAQ-UHFFFAOYSA-N Glutaraldehyde Chemical compound O=CCCCC=O SXRSQZLOMIGNAQ-UHFFFAOYSA-N 0.000 claims abstract description 20
- 235000012211 aluminium silicate Nutrition 0.000 claims abstract description 20
- 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 abstract description 20
- 230000015556 catabolic process Effects 0.000 claims abstract description 15
- 238000006731 degradation reaction Methods 0.000 claims abstract description 15
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 13
- 239000002994 raw material Substances 0.000 claims abstract description 13
- 239000000243 solution Substances 0.000 claims description 26
- 239000011248 coating agent Substances 0.000 claims description 25
- 238000000576 coating method Methods 0.000 claims description 25
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 16
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 16
- 239000007788 liquid Substances 0.000 claims description 15
- 238000003756 stirring Methods 0.000 claims description 15
- 238000002156 mixing Methods 0.000 claims description 10
- HVLLSGMXQDNUAL-UHFFFAOYSA-N triphenyl phosphite Chemical group C=1C=CC=CC=1OP(OC=1C=CC=CC=1)OC1=CC=CC=C1 HVLLSGMXQDNUAL-UHFFFAOYSA-N 0.000 claims description 10
- 238000005303 weighing Methods 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- MQIUGAXCHLFZKX-UHFFFAOYSA-N Di-n-octyl phthalate Natural products CCCCCCCCOC(=O)C1=CC=CC=C1C(=O)OCCCCCCCC MQIUGAXCHLFZKX-UHFFFAOYSA-N 0.000 claims description 5
- 239000007864 aqueous solution Substances 0.000 claims description 5
- BJQHLKABXJIVAM-UHFFFAOYSA-N bis(2-ethylhexyl) phthalate Chemical compound CCCCC(CC)COC(=O)C1=CC=CC=C1C(=O)OCC(CC)CCCC BJQHLKABXJIVAM-UHFFFAOYSA-N 0.000 claims description 5
- 238000007790 scraping Methods 0.000 claims description 5
- 238000001035 drying Methods 0.000 claims description 4
- FRVCGRDGKAINSV-UHFFFAOYSA-L iron(2+);octadecanoate Chemical compound [Fe+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O FRVCGRDGKAINSV-UHFFFAOYSA-L 0.000 claims description 2
- 238000000034 method Methods 0.000 claims 3
- 239000002689 soil Substances 0.000 abstract description 9
- 230000004888 barrier function Effects 0.000 abstract description 4
- 229920003023 plastic Polymers 0.000 description 5
- 239000004033 plastic Substances 0.000 description 5
- 239000002861 polymer material Substances 0.000 description 4
- 229920005615 natural polymer Polymers 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- GZUXJHMPEANEGY-UHFFFAOYSA-N bromomethane Chemical compound BrC GZUXJHMPEANEGY-UHFFFAOYSA-N 0.000 description 2
- 239000012634 fragment Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229920000747 poly(lactic acid) Polymers 0.000 description 2
- 239000004626 polylactic acid Substances 0.000 description 2
- WSQZNZLOZXSBHA-UHFFFAOYSA-N 3,8-dioxabicyclo[8.2.2]tetradeca-1(12),10,13-triene-2,9-dione Chemical compound O=C1OCCCCOC(=O)C2=CC=C1C=C2 WSQZNZLOZXSBHA-UHFFFAOYSA-N 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000012272 crop production Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 229920006237 degradable polymer Polymers 0.000 description 1
- 230000000779 depleting effect Effects 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000002316 fumigant Substances 0.000 description 1
- 238000002329 infrared spectrum Methods 0.000 description 1
- 229940102396 methyl bromide Drugs 0.000 description 1
- 238000001000 micrograph Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002985 plastic film Substances 0.000 description 1
- 229920006255 plastic film Polymers 0.000 description 1
- 229920005586 poly(adipic acid) Polymers 0.000 description 1
- 229920001707 polybutylene terephthalate Polymers 0.000 description 1
- 229920001610 polycaprolactone Polymers 0.000 description 1
- 239000004632 polycaprolactone Substances 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- 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
-
- 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
-
- 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
- C08J2300/00—Characterised by the use of unspecified polymers
- C08J2300/16—Biodegradable polymers
-
- 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
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2405/00—Characterised by the use of polysaccharides or of their derivatives not provided for in groups C08J2401/00 or C08J2403/00
- C08J2405/08—Chitin; Chondroitin sulfate; Hyaluronic acid; Derivatives thereof
-
- 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
-
- 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
- C08K3/34—Silicon-containing compounds
- C08K3/346—Clay
-
- 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
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/05—Alcohols; Metal alcoholates
- C08K5/053—Polyhydroxylic alcohols
-
- 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
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/07—Aldehydes; Ketones
-
- 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
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/09—Carboxylic acids; Metal salts thereof; Anhydrides thereof
-
- 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
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/09—Carboxylic acids; Metal salts thereof; Anhydrides thereof
- C08K5/098—Metal salts of carboxylic acids
Abstract
The invention relates to the technical field of polyethylene mulching films, and discloses a natural full-biodegradable polyethylene mulching film which comprises the following raw materials in parts by weight: 1-5 parts of chitosan, 0.6-0.9 part of polyvinyl alcohol, 0.3-0.6 part of acetic acid, 5-10 parts of kaolin, 2-4 parts of ferric stearate, 0.3-0.8 part of glutaraldehyde, 0.4-0.6 part of glycerol, 0.1-0.3 part of plasticizer and 0.2-0.4 part of degradation agent. According to the natural full-biodegradable polyethylene mulch film, chitosan, polyvinyl alcohol, acetic acid, kaolin, ferric stearate, glutaraldehyde and glycerol are added into the formula, the mechanical properties of the prepared full-biodegradable polyethylene mulch film are more than 2 times that of the traditional mulch film, the moisture barrier and the degradability are obviously superior to those of other full-biodegradable mulch films, and the natural full-biodegradable polyethylene mulch film has very important significance in solving the white pollution of farmlands in China, improving the agricultural cultivation efficiency and protecting and repairing the soil environment.
Description
Technical Field
The invention relates to the technical field of polyethylene mulching films, in particular to a natural full-biodegradable polyethylene mulching film and a preparation method thereof.
Background
Mulching film is a product used in plastic cultivation in a manner similar to a mulch to inhibit weeds and save water in crop production and landscaping, and some plastic mulches may also act as a barrier, leaving methyl bromide (a powerful fumigant and ozone depleting agent) in the soil and the crop growing through gaps or holes in the thin plastic cloth.
At present, most of the common degradable agricultural mulch films on the market are mulch films prepared by modifying polyethylene, the degradation is generally achieved by disintegrating into tiny plastic fragments in soil, the plastic fragments are difficult to degrade completely in the soil, certain pollution is still caused to the soil environment, the fully biodegradable agricultural mulch films are developed at home and abroad, most of the common degradable agricultural mulch films are synthesized degradable polymer materials such as polycaprolactone and polylactic acid, and the fully biodegradable agricultural mulch films on the market mainly take polylactic acid and poly adipic acid/butylene terephthalate as raw materials, the development and utilization of natural polymer materials with rich yield are still to be improved, the natural polymer materials have rich yield and strong regeneration capability, and the plastic films have important significance for reducing the utilization of nonrenewable petrochemical materials; meanwhile, the natural polymer material can reduce the damage of petrochemical materials to soil, and has great significance for protecting and repairing soil environment.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a natural full-biodegradable polyethylene mulch film and a preparation method thereof, has the advantage of complete degradation, and solves the problem that the existing polyethylene mulch film cannot be completely degraded.
In order to achieve the above purpose, the present invention provides the following technical solutions: the natural full-biodegradable polyethylene mulch film comprises the following raw materials in parts by weight: 1-5 parts of chitosan, 0.6-0.9 part of polyvinyl alcohol, 0.3-0.6 part of acetic acid, 5-10 parts of kaolin, 2-4 parts of ferric stearate, 0.3-0.8 part of glutaraldehyde, 0.4-0.6 part of glycerol, 0.1-0.3 part of plasticizer, 0.2-0.5 part of compatilizer and 0.2-0.4 part of degradation agent.
Preferably, the compatilizer is ADR4370S, and the plasticizer is triphenyl phosphite or dioctyl phthalate.
Preferably, the volume fraction of the acetic acid is 8%, and the volume fraction of the iron stearate is 0.3%.
Preferably, the feed comprises the following raw materials in parts by weight: 1 part of chitosan, 0.6 part of polyvinyl alcohol, 0.3 part of acetic acid, 5 parts of kaolin, 2 parts of ferric stearate, 0.3 part of glutaraldehyde, 0.4 part of glycerol, 0.1 part of plasticizer, 0.2 part of compatilizer and 0.2 part of degradation agent.
Preferably, the feed comprises the following raw materials in parts by weight: 3 parts of chitosan, 0.7 part of polyvinyl alcohol, 0.4 part of acetic acid, 7 parts of kaolin, 3 parts of ferric stearate, 0.5 part of glutaraldehyde, 0.5 part of glycerol, 0.2 part of plasticizer, 0.4 part of compatilizer and 0.3 part of degradation agent.
Preferably, the feed comprises the following raw materials in parts by weight: 5 parts of chitosan, 0.9 part of polyvinyl alcohol, 0.6 part of acetic acid, 10 parts of kaolin, 4 parts of ferric stearate, 0.8 part of glutaraldehyde, 0.6 part of glycerol, 0.3 part of plasticizer, 0.5 part of compatilizer and 0.4 part of degradation agent.
The invention provides a preparation method of natural full-biodegradable polyethylene mulch film, which comprises the following steps:
s1, weighing a certain amount of chitosan, dispersing the chitosan into an acetic acid aqueous solution with the volume fraction of 0.8%, and stirring at 45-50 ℃ until the chitosan is completely dissolved to obtain a chitosan solution A with the mass fraction of 1.0%;
s2, weighing a certain amount of polyvinyl alcohol, and stirring at 90-95 ℃ until the polyvinyl alcohol is completely dissolved in water to obtain a polyvinyl alcohol solution B with the mass fraction of 4.0%;
s3, mixing the chitosan solution A and the polyvinyl alcohol solution B according to the mass ratio of 10:0 and 9, uniformly stirring, performing ultrasonic defoaming, and adding glutaraldehyde and glycerol with the concentration of 1% being 2.5% to prepare a chitosan/polyvinyl alcohol liquid mulch film solution;
s4, adding kaolin and ferric stearate into the chitosan/polyvinyl alcohol liquid mulch film solution, mixing for 8-10 minutes in a torque rheometer, adding a plasticizer and a compatilizer, standing and defoaming;
s5, pouring the film forming liquid on a polytetrafluoroethylene plate, using a coating rod to carry out blade coating film forming on a coating machine, and uncovering the polytetrafluoroethylene plate to obtain the biodegradable mulch film.
Preferably, the specification of the coating rod is 100 mu m, and the film scraping speed of the coating rod is 15-20mm/min.
Preferably, the film uncovering condition of the polytetrafluoroethylene plate is 25-27 ℃ and the relative humidity is 50-60%, and the polytetrafluoroethylene plate is dried for 24-28h.
Compared with the prior art, the invention provides a natural full-biodegradable polyethylene mulch film and a preparation method thereof, and has the following beneficial effects:
according to the natural full-biodegradable polyethylene mulch film and the preparation method thereof, chitosan, polyvinyl alcohol, acetic acid, kaolin, ferric stearate, glutaraldehyde and glycerol are added into the formula, so that the mechanical properties of the prepared full-biodegradable polyethylene mulch film are more than 2 times that of the traditional mulch film, the moisture barrier and the degradability are obviously superior to those of other full-biodegradable mulch films, and the full-biodegradable polyethylene mulch film has very important significance for solving the white pollution of farmlands in China, improving the agricultural cultivation efficiency, protecting and repairing the soil environment.
Drawings
FIG. 1 is an electron microscope image of a polyethylene mulch film of the present invention;
FIG. 2 is an infrared spectrum of a polyethylene mulch film of the present invention at different degradation times.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Embodiment one: the natural full-biodegradable polyethylene mulch film comprises the following raw materials in parts by weight: 1 part of chitosan, 0.6 part of polyvinyl alcohol, 0.3 part of acetic acid, 5 parts of kaolin, 2 parts of ferric stearate, 0.3 part of glutaraldehyde, 0.4 part of glycerol, 0.1 part of plasticizer, 0.2 part of compatilizer and 0.2 part of degradation agent, wherein the compatilizer is ADR4370S, the plasticizer is triphenyl phosphite or dioctyl phthalate, the volume fraction of acetic acid is 8%, and the volume fraction of ferric stearate is 0.3%.
A preparation method of natural full-biodegradable polyethylene mulch film comprises the following steps:
s1, weighing a certain amount of chitosan, dispersing the chitosan into an acetic acid aqueous solution with the volume fraction of 0.8%, and stirring at 45 ℃ until the chitosan is completely dissolved to obtain a chitosan solution A with the mass fraction of 1.0%;
s2, weighing a certain amount of polyvinyl alcohol, and stirring at 90 ℃ until the polyvinyl alcohol is completely dissolved in water to obtain a polyvinyl alcohol solution B with the mass fraction of 4.0%;
s3, mixing the A and the B according to the mass ratio of 10:0 and 9, uniformly stirring, performing ultrasonic defoaming, and adding glutaraldehyde and glycerol with the concentration of 1% being 2.5% to prepare a chitosan/polyvinyl alcohol liquid mulch film solution;
s4, adding kaolin and ferric stearate into the chitosan/polyvinyl alcohol liquid mulch film solution, mixing for 8 minutes in a torque rheometer, adding a plasticizer and a compatilizer, standing and defoaming;
s5, pouring the film forming liquid on a polytetrafluoroethylene plate, carrying out blade coating film forming on a coating machine by using a coating rod, wherein the specification of the coating rod is 100 mu m, the film scraping speed of the coating rod is 15mm/min, and uncovering the polytetrafluoroethylene plate to obtain the biodegradable mulching film, wherein the uncovering condition of the polytetrafluoroethylene plate is 25 ℃ and the relative humidity is 50%, and drying for 24 hours.
Embodiment two: the natural full-biodegradable polyethylene mulch film comprises the following raw materials in parts by weight: 3 parts of chitosan, 0.7 part of polyvinyl alcohol, 0.4 part of acetic acid, 7 parts of kaolin, 3 parts of ferric stearate, 0.5 part of glutaraldehyde, 0.5 part of glycerol, 0.2 part of plasticizer, 0.4 part of compatilizer and 0.3 part of degradation agent, wherein the compatilizer is ADR4370S, the plasticizer is triphenyl phosphite or dioctyl phthalate, the volume fraction of acetic acid is 8%, and the volume fraction of ferric stearate is 0.3%.
A preparation method of natural full-biodegradable polyethylene mulch film comprises the following steps:
s1, weighing a certain amount of chitosan, dispersing the chitosan into an acetic acid aqueous solution with the volume fraction of 0.8%, and stirring at 47 ℃ until the chitosan is completely dissolved to obtain a chitosan solution A with the mass fraction of 1.0%;
s2, weighing a certain amount of polyvinyl alcohol, and stirring at 93 ℃ until the polyvinyl alcohol is completely dissolved in water to obtain a polyvinyl alcohol solution B with the mass fraction of 4.0%;
s3, mixing the A and the B according to the mass ratio of 10:0 and 9, uniformly stirring, performing ultrasonic defoaming, and adding glutaraldehyde and glycerol with the concentration of 1% being 2.5% to prepare a chitosan/polyvinyl alcohol liquid mulch film solution;
s4, adding kaolin and ferric stearate into the chitosan/polyvinyl alcohol liquid mulch film solution, mixing for 9 minutes in a torque rheometer, adding a plasticizer and a compatilizer, and standing for defoaming;
s5, pouring the film forming liquid on a polytetrafluoroethylene plate, carrying out blade coating film forming on a coating machine by using a coating rod, wherein the specification of the coating rod is 100 mu m, the film scraping speed of the coating rod is 17mm/min, and uncovering the polytetrafluoroethylene plate to obtain the biodegradable mulching film, wherein the film uncovering condition of the polytetrafluoroethylene plate is 26 ℃ and the relative humidity is 55%, and drying for 26 hours.
Embodiment III: the natural full-biodegradable polyethylene mulch film comprises the following raw materials in parts by weight: 5 parts of chitosan, 0.9 part of polyvinyl alcohol, 0.6 part of acetic acid, 10 parts of kaolin, 4 parts of ferric stearate, 0.8 part of glutaraldehyde, 0.6 part of glycerol, 0.3 part of plasticizer, 0.5 part of compatilizer and 0.4 part of degradation agent, wherein the compatilizer is ADR4370S, the plasticizer is triphenyl phosphite or dioctyl phthalate, the volume fraction of acetic acid is 8%, and the volume fraction of ferric stearate is 0.3%.
A preparation method of natural full-biodegradable polyethylene mulch film comprises the following steps:
s1, weighing a certain amount of chitosan, dispersing the chitosan into an acetic acid aqueous solution with the volume fraction of 0.8%, and stirring at 50 ℃ until the chitosan is completely dissolved to obtain a chitosan solution A with the mass fraction of 1.0%;
s2, weighing a certain amount of polyvinyl alcohol, and stirring at 95 ℃ until the polyvinyl alcohol is completely dissolved in water to obtain a polyvinyl alcohol solution B with the mass fraction of 4.0%;
s3, mixing the A and the B according to the mass ratio of 10:0 and 9, uniformly stirring, performing ultrasonic defoaming, and adding glutaraldehyde and glycerol with the concentration of 1% being 2.5% to prepare a chitosan/polyvinyl alcohol liquid mulch film solution;
s4, adding kaolin and ferric stearate into the chitosan/polyvinyl alcohol liquid mulch film solution, mixing for 10 minutes in a torque rheometer, adding a plasticizer and a compatilizer, and standing for defoaming;
s5, pouring the film forming liquid on a polytetrafluoroethylene plate, carrying out blade coating film forming on a coating machine by using a coating rod, wherein the specification of the coating rod is 100 mu m, the film scraping speed of the coating rod is 20mm/min, and uncovering the polytetrafluoroethylene plate to obtain the biodegradable mulching film, wherein the film uncovering condition of the polytetrafluoroethylene plate is 27 ℃ and the relative humidity is 60%, and drying for 28 hours.
The beneficial effects of the invention are as follows:
the mechanical property of the fully biodegradable polyethylene mulching film prepared by adding chitosan, polyvinyl alcohol, acetic acid, kaolin, ferric stearate, glutaraldehyde and glycerol into the formula is more than 2 times that of the traditional mulching film, the moisture barrier and the degradability are obviously superior to those of other fully biodegradable mulching films, and the fully biodegradable mulching film has very important significance for solving the white pollution of farmlands in China, improving the agricultural cultivation efficiency, protecting and repairing the soil environment.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. The natural full-biodegradable polyethylene mulch film is characterized by comprising the following raw materials in parts by weight: 1-5 parts of chitosan, 0.6-0.9 part of polyvinyl alcohol, 0.3-0.6 part of acetic acid, 5-10 parts of kaolin, 2-4 parts of ferric stearate, 0.3-0.8 part of glutaraldehyde, 0.4-0.6 part of glycerol, 0.1-0.3 part of plasticizer, 0.2-0.5 part of compatilizer and 0.2-0.4 part of degradation agent.
2. A natural full biodegradable polyethylene mulch film according to claim 1, wherein the compatibiliser is ADR4370S and the plasticizer is triphenyl phosphite or dioctyl phthalate.
3. A natural fully biodegradable polyethylene mulch according to claim 1, wherein the volume fraction of acetic acid is 8% and the volume fraction of iron stearate is 0.3%.
4. The natural full-biodegradable polyethylene mulch film according to claim 1, which is characterized by comprising the following raw materials in parts by weight: 1 part of chitosan, 0.6 part of polyvinyl alcohol, 0.3 part of acetic acid, 5 parts of kaolin, 2 parts of ferric stearate, 0.3 part of glutaraldehyde, 0.4 part of glycerol, 0.1 part of plasticizer, 0.2 part of compatilizer and 0.2 part of degradation agent.
5. The natural full-biodegradable polyethylene mulch film according to claim 1, which is characterized by comprising the following raw materials in parts by weight: 3 parts of chitosan, 0.7 part of polyvinyl alcohol, 0.4 part of acetic acid, 7 parts of kaolin, 3 parts of ferric stearate, 0.5 part of glutaraldehyde, 0.5 part of glycerol, 0.2 part of plasticizer, 0.4 part of compatilizer and 0.3 part of degradation agent.
6. The natural full-biodegradable polyethylene mulch film according to claim 1, which is characterized by comprising the following raw materials in parts by weight: 5 parts of chitosan, 0.9 part of polyvinyl alcohol, 0.6 part of acetic acid, 10 parts of kaolin, 4 parts of ferric stearate, 0.8 part of glutaraldehyde, 0.6 part of glycerol, 0.3 part of plasticizer, 0.5 part of compatilizer and 0.4 part of degradation agent.
7. A method for preparing a natural full biodegradable polyethylene mulch film according to any one of claims 1-6, comprising the steps of:
s1, weighing a certain amount of chitosan, dispersing the chitosan into an acetic acid aqueous solution with the volume fraction of 0.8%, and stirring at 45-50 ℃ until the chitosan is completely dissolved to obtain a chitosan solution A with the mass fraction of 1.0%;
s2, weighing a certain amount of polyvinyl alcohol, and stirring at 90-95 ℃ until the polyvinyl alcohol is completely dissolved in water to obtain a polyvinyl alcohol solution B with the mass fraction of 4.0%;
s3, mixing the chitosan solution A and the polyvinyl alcohol solution B according to the mass ratio of 10:0 and 9, uniformly stirring, performing ultrasonic defoaming, and adding glutaraldehyde and glycerol with concentration of 1% being 2.5% to prepare a chitosan/polyvinyl alcohol liquid mulch film solution;
s4, adding kaolin and ferric stearate into the chitosan/polyvinyl alcohol liquid mulch film solution, mixing for 8-10 minutes in a torque rheometer, adding a plasticizer and a compatilizer, standing and defoaming;
s5, pouring the film forming liquid on a polytetrafluoroethylene plate, using a coating rod to carry out blade coating film forming on a coating machine, and uncovering the polytetrafluoroethylene plate to obtain the biodegradable mulch film.
8. The method for preparing natural full-biodegradable polyethylene mulch film according to claim 7, wherein the specification of the coating rod is 100 μm, and the film scraping speed of the coating rod is 15-20mm/min.
9. The method for preparing natural full-biodegradable polyethylene mulch film according to claim 7, wherein the condition of uncovering the film of polytetrafluoroethylene plate is 25-27 ℃ and relative humidity is 50-60%, and drying is carried out for 24-28h.
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