CN113956624A - Preparation method of biomass full-degradable water-retention and fertility-increasing agricultural mulching film - Google Patents
Preparation method of biomass full-degradable water-retention and fertility-increasing agricultural mulching film Download PDFInfo
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- 238000002360 preparation method Methods 0.000 title claims abstract description 19
- 239000002028 Biomass Substances 0.000 title claims abstract description 17
- 206010016807 Fluid retention Diseases 0.000 title claims abstract description 17
- 239000002245 particle Substances 0.000 claims abstract description 67
- 238000002156 mixing Methods 0.000 claims abstract description 44
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical class [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims abstract description 31
- 229920002472 Starch Polymers 0.000 claims abstract description 27
- 239000008107 starch Substances 0.000 claims abstract description 27
- 235000019698 starch Nutrition 0.000 claims abstract description 27
- 238000003756 stirring Methods 0.000 claims abstract description 25
- 239000000440 bentonite Substances 0.000 claims abstract description 22
- 229910000278 bentonite Inorganic materials 0.000 claims abstract description 22
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims abstract description 22
- 238000006731 degradation reaction Methods 0.000 claims abstract description 12
- 238000010096 film blowing Methods 0.000 claims abstract description 7
- 239000002994 raw material Substances 0.000 claims abstract description 5
- 229920001896 polybutyrate Polymers 0.000 claims abstract 26
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims description 20
- 239000001506 calcium phosphate Substances 0.000 claims description 20
- 229910000389 calcium phosphate Inorganic materials 0.000 claims description 20
- 235000011010 calcium phosphates Nutrition 0.000 claims description 20
- 239000004202 carbamide Substances 0.000 claims description 20
- QORWJWZARLRLPR-UHFFFAOYSA-H tricalcium bis(phosphate) Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O QORWJWZARLRLPR-UHFFFAOYSA-H 0.000 claims description 20
- 238000011049 filling Methods 0.000 claims description 14
- 238000005469 granulation Methods 0.000 claims description 14
- 230000003179 granulation Effects 0.000 claims description 14
- 239000002131 composite material Substances 0.000 claims description 11
- 239000000155 melt Substances 0.000 claims description 11
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 10
- 238000001125 extrusion Methods 0.000 claims description 9
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 8
- 239000000843 powder Substances 0.000 claims description 8
- 239000003337 fertilizer Substances 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 7
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 5
- 238000010907 mechanical stirring Methods 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 5
- 125000000914 phenoxymethylpenicillanyl group Chemical group CC1(S[C@H]2N([C@H]1C(=O)*)C([C@H]2NC(COC2=CC=CC=C2)=O)=O)C 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 229920000881 Modified starch Polymers 0.000 claims description 4
- 238000001694 spray drying Methods 0.000 claims description 4
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical group [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 3
- 239000007864 aqueous solution Substances 0.000 claims description 3
- 239000011246 composite particle Substances 0.000 claims description 3
- 239000007822 coupling agent Substances 0.000 claims description 3
- 150000001669 calcium Chemical class 0.000 claims description 2
- FWDBOZPQNFPOLF-UHFFFAOYSA-N ethenyl(triethoxy)silane Chemical compound CCO[Si](OCC)(OCC)C=C FWDBOZPQNFPOLF-UHFFFAOYSA-N 0.000 claims description 2
- 239000003960 organic solvent Substances 0.000 claims description 2
- 230000015556 catabolic process Effects 0.000 claims 6
- 239000000463 material Substances 0.000 abstract description 4
- 239000004629 polybutylene adipate terephthalate Substances 0.000 description 59
- -1 Polyethylene Polymers 0.000 description 5
- 239000008187 granular material Substances 0.000 description 5
- 239000004594 Masterbatch (MB) Substances 0.000 description 3
- 239000004698 Polyethylene Substances 0.000 description 3
- 230000009471 action Effects 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 3
- 229920000573 polyethylene Polymers 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 229920000331 Polyhydroxybutyrate Polymers 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000005038 ethylene vinyl acetate Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 2
- 239000005015 poly(hydroxybutyrate) Substances 0.000 description 2
- 229920001610 polycaprolactone Polymers 0.000 description 2
- 239000004632 polycaprolactone Substances 0.000 description 2
- 229920000379 polypropylene carbonate Polymers 0.000 description 2
- 238000010298 pulverizing process Methods 0.000 description 2
- 229920002101 Chitin Polymers 0.000 description 1
- 229920001661 Chitosan Polymers 0.000 description 1
- 239000004368 Modified starch Substances 0.000 description 1
- 239000002202 Polyethylene glycol Substances 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000006065 biodegradation reaction Methods 0.000 description 1
- 238000000071 blow moulding Methods 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 229920006237 degradable polymer Polymers 0.000 description 1
- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000000383 hazardous chemical Substances 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000011256 inorganic filler Substances 0.000 description 1
- 229910003475 inorganic filler Inorganic materials 0.000 description 1
- VUZPPFZMUPKLLV-UHFFFAOYSA-N methane;hydrate Chemical compound C.O VUZPPFZMUPKLLV-UHFFFAOYSA-N 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 235000019426 modified starch Nutrition 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 239000005014 poly(hydroxyalkanoate) Substances 0.000 description 1
- 229920001223 polyethylene glycol Polymers 0.000 description 1
- 229920000903 polyhydroxyalkanoate Polymers 0.000 description 1
- 239000004626 polylactic acid Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- KDYFGRWQOYBRFD-UHFFFAOYSA-L succinate(2-) Chemical compound [O-]C(=O)CCC([O-])=O KDYFGRWQOYBRFD-UHFFFAOYSA-L 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
- C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
- C08J2367/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
-
- 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
- C08J2403/00—Characterised by the use of starch, amylose or amylopectin or of their derivatives or degradation products
- C08J2403/02—Starch; Degradation products thereof, e.g. dextrin
-
- 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
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
- C08K2003/265—Calcium, strontium or barium carbonate
-
- 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
- C08K3/32—Phosphorus-containing compounds
- C08K2003/321—Phosphates
- C08K2003/325—Calcium, strontium or barium phosphate
-
- 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
- C08K5/16—Nitrogen-containing compounds
- C08K5/21—Urea; Derivatives thereof, e.g. biuret
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
- Y02A40/28—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture specially adapted for farming
Abstract
The invention provides a preparation method of a biomass full-degradation water-retention and fertility-increasing agricultural mulching film, which comprises the following steps: s1, preparing modified PVA filled PBAT particles, S2, preparing modified calcium carbonate high filled PBAT particles, S3, preparing starch/bentonite high filled modified PBAT particles, S4, preparing a PBAT mulching film, taking the modified PVA filled PBAT particles, the modified calcium carbonate high filled PBAT particles and the starch/bentonite high filled modified PBAT particles, dry blending by adopting a crushing and stirring machine, taking the blended material as a raw material, and preparing the mulching film by adopting a film blowing method.
Description
Technical Field
The invention belongs to the technical field of preparation methods of agricultural mulching films, and particularly relates to a preparation method of a biomass full-degradable water-retention and fertility-increasing agricultural mulching film.
Background
Agricultural films are an important part in the field of plastic processing industry in China, are main production data in the development process of modern agriculture, and have more and more important functions in modern agricultural science and technology. Agricultural films such as greenhouse films and mulching films are receiving more and more attention as main production materials for high and stable yield of agriculture. Usually, the main matrix materials of the agricultural film are Polyethylene (PE) and ethylene-vinyl acetate copolymer (EVA), and because matrix resin is difficult to degrade, "white pollution" is easily formed, the environmental pollution is caused. The biodegradable mulching film is an agricultural mulching film prepared by using polymers with degradability as main materials and adopting blow molding through natural biodegradable materials such as starch, cellulose, chitosan, chitin and the like or inorganic fillers such as calcium carbonate, talcum powder and the like without environmental hazards. Under the natural environmental conditions of illumination, temperature, oxygen, microorganism and the like, the biodegradable mulching film is subjected to degradation reaction to obtain carbon dioxide and water without environmental hazard. Moreover, after the crops are harvested, the residual film quantity is small, white pollution cannot be caused, and the strategic requirements of sustainable development of ecological environment are met.
At present, biodegradable mulching films mainly adopt degradable polymer matrix materials such as polypropylene carbonate (PPC), polybutylene adipate terephthalate (PBAT), Polyhydroxyalkanoate (PHAS), polylactic acid (PLA), Polyhydroxybutyrate (PHB), Polycaprolactone (PCL), polyethylene glycol succinate (PBS) and the like. Wen-selfing et al used polybutylene adipate terephthalate (PBAT) to replace polyethylene mulching film.
Although biodegradable agricultural mulching films have been reported and applied, there are several problems:
1. high biodegradation rate and low cost are difficult to unify;
2. the existing biodegradable agricultural mulching film has single function and limits the growth of crops.
Disclosure of Invention
The invention aims to solve the technical problem of providing a preparation method of a biomass full-degradation water-retention and fertility-increasing agricultural mulching film aiming at the defects of the prior art, so as to solve the problems in the background technology.
In order to solve the technical problems, the invention adopts the technical scheme that: a preparation method of a biomass full-degradation water-retention and fertility-increasing agricultural mulching film comprises the following steps:
s1, preparing modified PVA filled PBAT particles,
dissolving PVA, calcium phosphate and urea in water according to a certain proportion, mechanically stirring, and then carrying out spray drying to obtain PVA/calcium phosphate/urea composite powder particles, and then carrying out melt blending granulation on the PVA/calcium phosphate/urea composite powder particles and PBAT particles through a double-screw extruder to obtain modified PVA filled PBAT particles;
s2, preparing modified calcium carbonate high-filling PBAT particles,
mechanically stirring and uniformly mixing calcium carbonate, a silane coupling agent and PBAT particles, and then carrying out melt blending granulation by a double-screw extruder to obtain modified calcium carbonate high-filling PBAT particles;
s3, preparing starch/bentonite high-filling modified PBAT particles,
mechanically stirring and uniformly mixing starch, bentonite and PBAT particles, and then carrying out melt blending granulation by a double-screw extruder to obtain starch/bentonite high-filling modified PBAT particles;
s4, preparing PBAT mulching film
Taking modified PVA-filled PBAT particles, modified calcium carbonate-highly-filled PBAT particles and starch/bentonite-highly-filled modified PBAT particles, dry-blending by adopting a crushing and stirring machine, taking the blend as a raw material, and preparing the mulching film by adopting a film blowing method.
Further, in S1, the mass ratio of PVA, calcium phosphate and urea is 100: 5-10: 10-20%, wherein the concentration of the PVA/calcium phosphate/urea composite aqueous solution is 10-25%; mechanically stirring and mixing for 20-60 min under the condition of 200-500 rpm, wherein the melt extrusion temperature in the melt blending granulation of a double-screw extruder is 155 ℃.
Further, in S1, the mass ratio of the PBAT to the PVA/calcium phosphate/urea composite particles is 100: 50 to 100.
Further, in S2, the silane coupling agent is a titanate coupling agent, fluorosilicone, or vinyltriethoxysilane, and the mass ratio of PBAT, calcium carbonate, and silane coupling agent is 100: 200-400: 2 to 20.
Further, in S2, mechanically stirring and mixing at 100-300 rpm for 40-50min, wherein the melt extrusion temperature of the twin-screw extruder is 170 ℃.
Further, in S3, the starch is pregelatinized starch, the mass ratio of PBAT, starch and bentonite is 100: 50-100: 20 to 50 of the total amount of the organic solvent,
the mechanical stirring is carried out by mixing for 25min under the condition of 100-300 rpm, and the melt extrusion temperature of a double-screw extruder is 165 ℃.
Further, in S4, the mass ratio of the modified PVA filled PBAT particles, the modified calcium carbonate highly filled PBAT particles, and the starch/bentonite highly filled modified PBAT particles is 100: 50-150: 50 to 100.
Further, in S4, a dry blending stirring speed of 100-200 rpm and a crushing time of 15min are adopted.
Further, in S4, the prepared mulching film has a thickness of 0.01-0.05 mm and a width of 300-800 mm.
Compared with the prior art, the invention has the following advantages:
according to the invention, firstly, PBAT particles are filled with modified starch, PBAT particles are highly filled with modified calcium carbonate, and PBAT particles are highly filled with PVA/bentonite, a mechanical blending method is adopted to prepare a multifunctional PBAT blending master batch, and finally, the self-made multifunctional PBAT blending master batch is prepared into the multifunctional PBAT mulching film by adopting a film blowing process.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Embodiment 1, the present invention provides a technical solution: a preparation method of a biomass full-degradation water-retention and fertility-increasing agricultural mulching film comprises the following steps:
s1, preparing modified PVA filled PBAT particles,
mixing PVA, calcium phosphate and urea in a mass ratio of 100: 5: 10, dissolving in water, wherein the concentration of the PVA/calcium phosphate/urea composite aqueous solution is 25%, mechanically stirring and mixing for 40min at 300rpm, then carrying out spray drying to obtain PVA/calcium phosphate/urea composite powder particles, and then mixing the PVA/calcium phosphate/urea composite powder particles with PBAT particles, wherein the mass ratio of the PBAT particles to the PVA/calcium phosphate/urea composite particles is 100: 50;
and carrying out melt blending granulation by a double-screw extruder to obtain modified PVA filled PBAT granules, wherein the melt extrusion temperature is 155 ℃.
S2, preparing modified calcium carbonate high-filling PBAT particles,
calcium carbonate, a silane coupling agent and PBAT particles, wherein the silane coupling agent is a titanate coupling agent, and the mass ratio of the PBAT to the calcium carbonate to the silane coupling agent is 100: 200: 2, uniformly stirring and mixing mechanically, stirring for 50min at 200rpm, and performing melt blending granulation by a double-screw extruder to obtain the modified calcium carbonate high-filling PBAT particles, wherein the melt extrusion temperature of the double-screw extruder is 170 ℃.
S3, preparing starch/bentonite high-filling modified PBAT particles,
mixing starch, bentonite and PBAT particles, wherein the starch is pre-gelatinized starch, and the mass ratio of the PBAT to the starch to the bentonite is 100: 100: and 50, after the mechanical stirring and the uniform mixing, the mechanical stirring is to mix for 25min under the condition of 300rpm, and the starch/bentonite high-filling modified PBAT particles are obtained by melt blending granulation through a double-screw extruder, wherein the melt extrusion temperature of the double-screw extruder is 165 ℃.
S4, preparing PBAT mulching film
The preparation method comprises the following steps of taking modified PVA filled PBAT particles, modified calcium carbonate high-filled PBAT particles and starch/bentonite high-filled modified PBAT particles, wherein the mass ratio of the modified PVA filled PBAT particles to the modified calcium carbonate high-filled PBAT particles to the starch/bentonite high-filled modified PBAT particles is 100: 50: 50;
and (2) dry blending by adopting a pulverizing stirrer, wherein the blending stirring speed is 100-200 rpm, the pulverizing time is 15min, the blend is used as a raw material, a film blowing method is adopted to prepare the mulching film, and the prepared mulching film has the thickness of 0.01-0.05 mm and the width of 300-800 mm.
Embodiment 2, the present invention provides a technical solution: a preparation method of a biomass full-degradation water-retention and fertility-increasing agricultural mulching film comprises the following steps:
s1, dissolving 100g of PVA, 10g of calcium phosphate and 10g of urea in 880ml of water according to a certain proportion, mechanically stirring for 1h, spray-drying to obtain PVA/calcium phosphate/urea composite powder particles, mechanically stirring and mixing 50g of self-made PVA/calcium phosphate/urea composite powder particles and 100g of PBAT particles for 30min at 200rpm, and further performing melt blending granulation at 155 ℃ through a double-screw extruder to obtain the modified PVA filled PBAT particles.
S2, mechanically stirring and mixing 200g of calcium carbonate, 10g of silane coupling agent and 100g of PBAT granules for 40min at 200rpm, and performing melt blending and granulation at 170 ℃ through a double-screw extruder to obtain the modified calcium carbonate high-filling PBAT granules.
S3, mechanically stirring and mixing 50g of starch, 20g of bentonite and 100g of PBAT granules for 25min at 300rpm, and performing melt blending granulation at 165 ℃ through a double-screw extruder to obtain the starch/bentonite high-filling modified PBAT granules.
S4, taking 100g of modified PVA-filled PBAT particles, 100g of modified calcium carbonate-filled PBAT particles and 50g of starch/bentonite-filled modified PBAT particles, dry blending by a crushing and stirring machine, stirring at 200rpm for 15min, taking the blend as a raw material, and preparing the mulching film by a film blowing method.
The properties of the samples in example 1 and the samples in example 2 are shown in the following table:
the multifunctional PBAT mulching film is prepared by using the multifunctional PBAT blending master batch and adopting a film blowing process, and the contained N and P elements have excellent improvement effect and fertilizer effect on soil.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments 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. A preparation method of a biomass full-degradable water-retention and fertility-increasing agricultural mulching film is characterized by comprising the following steps: the method comprises the following steps:
s1, preparing modified PVA filled PBAT particles,
dissolving PVA, calcium phosphate and urea in water according to a certain proportion, mechanically stirring, and then carrying out spray drying to obtain PVA/calcium phosphate/urea composite powder particles, and then carrying out melt blending granulation on the PVA/calcium phosphate/urea composite powder particles and PBAT particles through a double-screw extruder to obtain modified PVA filled PBAT particles;
s2, preparing modified calcium carbonate high-filling PBAT particles,
mechanically stirring and uniformly mixing calcium carbonate, a silane coupling agent and PBAT particles, and then carrying out melt blending granulation by a double-screw extruder to obtain modified calcium carbonate high-filling PBAT particles;
s3, preparing starch/bentonite high-filling modified PBAT particles,
mechanically stirring and uniformly mixing starch, bentonite and PBAT particles, and then carrying out melt blending granulation by a double-screw extruder to obtain starch/bentonite high-filling modified PBAT particles;
s4, preparing PBAT mulching film
Taking modified PVA-filled PBAT particles, modified calcium carbonate-highly-filled PBAT particles and starch/bentonite-highly-filled modified PBAT particles, dry-blending by adopting a crushing and stirring machine, taking the blend as a raw material, and preparing the mulching film by adopting a film blowing method.
2. The preparation method of the agricultural mulching film for full degradation, water retention and fertilizer increase of biomass according to claim 1, wherein in S1, the mass ratio of PVA, calcium phosphate and urea is 100: 5-10: 10-20%, wherein the concentration of the PVA/calcium phosphate/urea composite aqueous solution is 10-25%; mechanically stirring and mixing for 20-60 min under the condition of 200-500 rpm, wherein the melt extrusion temperature in the melt blending granulation of a double-screw extruder is 155 ℃.
3. The preparation method of the agricultural mulching film for full degradation, water retention and fertilizer increase of biomass according to claim 1, wherein in S1, the mass ratio of PBAT to PVA/calcium phosphate/urea composite particles is 100: 50 to 100.
4. The preparation method of the agricultural mulching film for full degradation, water retention and fertilizer increase of biomass according to claim 1, wherein in S2, the silane coupling agent is titanate coupling agent, fluorosilicone or vinyltriethoxysilane, and the mass ratio of PBAT, calcium carbonate and silane coupling agent is 100: 200-400: 2 to 20.
5. The preparation method of the biomass fully-degradable water-retention and fertilizer-increasing agricultural mulching film according to claim 1, wherein in S2, the mechanical stirring and mixing are carried out at 100-300 rpm for 40-50min, and the melt extrusion temperature of a double-screw extruder is 170 ℃.
6. The preparation method of the agricultural mulching film for full degradation, water retention and fertilizer increase of biomass according to claim 1, wherein in S3, the starch is pregelatinized starch, the mass ratio of PBAT, starch and bentonite is 100: 50-100: 20 to 50 of the total amount of the organic solvent,
the mechanical stirring is carried out by mixing for 25min under the condition of 100-300 rpm, and the melt extrusion temperature of a double-screw extruder is 165 ℃.
7. The preparation method of the agricultural mulching film for full degradation, water retention and fertilizer increase of biomass according to claim 1, wherein in S4, the mass ratio of the modified PVA filled PBAT particles, the modified calcium carbonate high filled PBAT particles and the starch/bentonite high filled modified PBAT particles is 100: 50-150: 50 to 100.
8. The preparation method of the agricultural mulching film for full degradation, water retention and fertilizer increase of the biomass according to claim 1, wherein in S4, a crushing and stirring machine is adopted to dry blend and stir at a speed of 100-200 rpm for 15 min.
9. The preparation method of the biomass fully-degradable water-retention and fertilizer-increasing agricultural mulching film according to claim 1, wherein in S4, the prepared mulching film has a thickness of 0.01-0.05 mm and a width of 300-800 mm.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115448782A (en) * | 2022-09-06 | 2022-12-09 | 黑龙江省农业科学院植物保护研究所 | Rice fertilizer film for preventing diseases and insect pests as well as preparation method and application thereof |
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| CN101864132A (en) * | 2010-05-26 | 2010-10-20 | 四川大学 | Fusion preparation method of polyvinyl alcohol film |
| CN105199335A (en) * | 2015-09-17 | 2015-12-30 | 苏州新区佳合塑胶有限公司 | Preparation method of degradable plastic thin film |
| CN113444346A (en) * | 2021-06-29 | 2021-09-28 | 熊彼特包装科技(苏州)有限公司 | Organic and inorganic filled PBAT complete biodegradable material composition and particles and film prepared from same |
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| CN101864132A (en) * | 2010-05-26 | 2010-10-20 | 四川大学 | Fusion preparation method of polyvinyl alcohol film |
| CN105199335A (en) * | 2015-09-17 | 2015-12-30 | 苏州新区佳合塑胶有限公司 | Preparation method of degradable plastic thin film |
| CN113444346A (en) * | 2021-06-29 | 2021-09-28 | 熊彼特包装科技(苏州)有限公司 | Organic and inorganic filled PBAT complete biodegradable material composition and particles and film prepared from same |
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| CN115448782A (en) * | 2022-09-06 | 2022-12-09 | 黑龙江省农业科学院植物保护研究所 | Rice fertilizer film for preventing diseases and insect pests as well as preparation method and application thereof |
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