CN114149667A - High weather-proof biodegradable mulch film special for cotton - Google Patents
High weather-proof biodegradable mulch film special for cotton Download PDFInfo
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- CN114149667A CN114149667A CN202111658969.4A CN202111658969A CN114149667A CN 114149667 A CN114149667 A CN 114149667A CN 202111658969 A CN202111658969 A CN 202111658969A CN 114149667 A CN114149667 A CN 114149667A
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- 229920000742 Cotton Polymers 0.000 title claims abstract description 27
- 239000002362 mulch Substances 0.000 title description 4
- TYFQFVWCELRYAO-UHFFFAOYSA-N suberic acid Chemical compound OC(=O)CCCCCCC(O)=O TYFQFVWCELRYAO-UHFFFAOYSA-N 0.000 claims abstract description 54
- 239000002904 solvent Substances 0.000 claims abstract description 52
- 239000002994 raw material Substances 0.000 claims abstract description 44
- 229920002635 polyurethane Polymers 0.000 claims abstract description 35
- 239000004814 polyurethane Substances 0.000 claims abstract description 35
- 229920001896 polybutyrate Polymers 0.000 claims abstract description 29
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 28
- 239000004014 plasticizer Substances 0.000 claims abstract description 27
- 239000003381 stabilizer Substances 0.000 claims abstract description 22
- 239000012752 auxiliary agent Substances 0.000 claims abstract description 14
- 230000003373 anti-fouling effect Effects 0.000 claims abstract description 12
- 239000003963 antioxidant agent Substances 0.000 claims abstract description 12
- 230000003078 antioxidant effect Effects 0.000 claims abstract description 12
- 239000003086 colorant Substances 0.000 claims abstract description 12
- 230000003678 scratch resistant effect Effects 0.000 claims abstract description 12
- 125000005587 carbonate group Chemical group 0.000 claims abstract description 9
- 230000002745 absorbent Effects 0.000 claims abstract description 5
- 239000002250 absorbent Substances 0.000 claims abstract description 5
- 238000010438 heat treatment Methods 0.000 claims description 41
- 229920003023 plastic Polymers 0.000 claims description 30
- 239000004033 plastic Substances 0.000 claims description 30
- 238000003756 stirring Methods 0.000 claims description 30
- 229920000379 polypropylene carbonate Polymers 0.000 claims description 28
- 238000001125 extrusion Methods 0.000 claims description 18
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 claims description 15
- 238000005266 casting Methods 0.000 claims description 15
- 238000001035 drying Methods 0.000 claims description 15
- 239000000203 mixture Substances 0.000 claims description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 238000010096 film blowing Methods 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 9
- 238000005469 granulation Methods 0.000 claims description 7
- 230000003179 granulation Effects 0.000 claims description 7
- KXDHJXZQYSOELW-UHFFFAOYSA-M Carbamate Chemical compound NC([O-])=O KXDHJXZQYSOELW-UHFFFAOYSA-M 0.000 claims description 5
- 150000002148 esters Chemical class 0.000 claims description 5
- 239000012528 membrane Substances 0.000 claims description 4
- KMTRUDSVKNLOMY-UHFFFAOYSA-N Ethylene carbonate Chemical compound O=C1OCCO1 KMTRUDSVKNLOMY-UHFFFAOYSA-N 0.000 claims description 2
- 241000219146 Gossypium Species 0.000 description 18
- 239000002985 plastic film Substances 0.000 description 10
- 229920006255 plastic film Polymers 0.000 description 9
- 230000000694 effects Effects 0.000 description 4
- 238000004321 preservation Methods 0.000 description 4
- 239000002689 soil Substances 0.000 description 4
- 239000013043 chemical agent Substances 0.000 description 3
- 241000196324 Embryophyta Species 0.000 description 2
- 229920000915 polyvinyl chloride Polymers 0.000 description 2
- 239000004800 polyvinyl chloride Substances 0.000 description 2
- 238000007790 scraping Methods 0.000 description 2
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 230000006750 UV protection Effects 0.000 description 1
- 241000607479 Yersinia pestis Species 0.000 description 1
- 230000002411 adverse Effects 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
- 230000009286 beneficial effect Effects 0.000 description 1
- 229920000704 biodegradable plastic Polymers 0.000 description 1
- 238000006065 biodegradation reaction Methods 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- JBTWLSYIZRCDFO-UHFFFAOYSA-N ethyl methyl carbonate Chemical compound CCOC(=O)OC JBTWLSYIZRCDFO-UHFFFAOYSA-N 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000463 material Substances 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
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 230000008635 plant growth Effects 0.000 description 1
- 230000004224 protection Effects 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000006097 ultraviolet radiation absorber Substances 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/40—Layered products comprising a layer of synthetic resin comprising polyurethanes
-
- 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
- C08J2469/00—Characterised by the use of polycarbonates; Derivatives of polycarbonates
-
- 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
- C08J2475/00—Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
- C08J2475/04—Polyurethanes
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Laminated Bodies (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Biological Depolymerization Polymers (AREA)
Abstract
The invention relates to the technical field of mulching films, and discloses a special high-weather-resistance biodegradable mulching film for cotton, which comprises the following raw materials in proportion: 15-35% of biodegradable polyurethane containing a carbonate structure, 15-25% of PPC, 40-70% of PBAT, 70-90% of solvent, 4-8% of plasticizer, 4-8% of suberic acid, 1-2% of ultraviolet absorbent, 1-2% of antioxidant, 1-2% of flatting agent, 1-2% of heat-resistant stabilizer, 1-2% of weather-resistant stabilizer, 1-2% of heat-insulating agent, 1-2% of scratch-resistant auxiliary agent, 1-2% of antifouling auxiliary agent and 1-2% of coloring agent.
Description
Technical Field
The invention relates to the technical field of mulching films, in particular to a high-weather-resistance biodegradable mulching film special for cotton.
Background
Mulching film, i.e., ground covering film, is usually a transparent or black PE film, and also has green and silver films, and is used for ground covering to increase the temperature of soil, maintain the moisture of soil, maintain the soil structure, prevent pests from attacking crops and diseases caused by certain microorganisms, etc., and promote the growth of plants.
Cotton is a plant with certain requirements on temperature, so a mulching film is often used in the planting process. Most of the existing mulching films are made of polyvinyl chloride, the polyvinyl chloride is an undegradable material, the mulching films are discarded after being used for a certain time, the processing difficulty is high, and adverse effects can be caused to the environment after the mulching films are discarded. Therefore, a special high weather-resistant biodegradable mulching film for cotton is needed to solve the problems.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides the high weather-resistant biodegradable mulching film special for cotton to solve the problems.
(II) technical scheme
In order to achieve the purpose, the invention provides the following technical scheme: the high weather-resistant biodegradable mulching film special for cotton comprises the following raw materials in proportion: 15-35% of biodegradable polyurethane containing a carbonate structure, 15-25% of PPC, 40-70% of PBAT, 70-90% of solvent, 4-8% of plasticizer, 4-8% of suberic acid, 1-2% of ultraviolet absorbent, 1-2% of antioxidant, 1-2% of flatting agent, 1-2% of heat-resistant stabilizer, 1-2% of weather-resistant stabilizer, 1-2% of heat-insulating agent, 1-2% of scratch-resistant auxiliary agent, 1-2% of antifouling auxiliary agent and 1-2% of coloring agent.
Preferably, the solvent is polar carbamate ester solvent, the water content is less than or equal to 450ppm, and the solvent is mainly ethyl acetate.
The special high weather-resistant biodegradable mulching film for cotton is characterized in that: the method comprises the following steps: the method comprises the following steps:
(1) preparing raw materials of the mulching film: the method comprises the steps of firstly preparing three containers, wherein the three containers are respectively divided into a container A, a container B and a container C, and adding a proper amount of solvent into the three containers, wherein the ratio of the solvent in the container A to the solvent in the container B to the solvent in the container C is 3-7: 2-4: 1-2.
(2) Preparing an intermediate layer film: placing a container A into a heating device, pouring a proper amount of polyurethane, PPC and PBAT into the container A to be dissolved in a solvent, heating to 80-105 ℃, sequentially adding a proper amount of suberic acid and a plasticizer, then adding a flatting agent, a heat-resistant stabilizer, a weather-resistant stabilizer and a heat-insulating agent, stirring for 1-3 hours, stopping heating and standing for 70-90 minutes after stirring, injecting the mixture into a feed inlet of a double-screw extruder through a casting machine, wherein the temperature of the front section is 130-170 ℃, the temperature of the rear section is 150-200 ℃, reacting for 1.5-3 minutes, extruding, granulating under water at 30-60 ℃, and drying to obtain the plastic raw material for the intermediate layer film.
(3) Preparing an outer layer film: placing a container C into a heating device, pouring a proper amount of polyurethane, PPC and PBAT into the container C, dissolving the polyurethane, PPC and PBAT into a solvent, heating to 60-80 ℃, adding a proper amount of suberic acid and a plasticizer, sequentially adding a coloring agent, an antioxidant and a heat insulating agent, stirring for 30-40 minutes, stopping heating and standing for 10-20 minutes after stirring, injecting the mixture into a feed inlet of a double-screw extruder through a casting machine, wherein the temperature of the front section is 130-170 ℃, the temperature of the rear section is 150-200 ℃, reacting for 1.5-3 minutes, carrying out underwater granulation at 30-60 ℃, and drying to obtain the plastic raw material for the outer layer film.
(4) Preparing a bottom layer film: placing a container B into a heating device, pouring a proper amount of polyurethane, PPC and PBAT into the container B, dissolving the polyurethane, PPC and PBAT into a solvent, heating to 70-90 ℃, adding a proper amount of suberic acid and a plasticizer, sequentially adding a scratch-resistant assistant and an antifouling assistant, stirring for 50-70 minutes, stopping heating and standing for 40-50 minutes after stirring, injecting the mixture into a feed inlet of a double-screw extruder through a casting machine, wherein the temperature of the front section is 130-170 ℃, the temperature of the rear section is 150-200 ℃, reacting for 1.5-3 minutes, carrying out underwater granulation at 30-60 ℃, and drying to obtain the plastic raw material for the bottom layer film.
(5) And respectively carrying out three-layer co-extrusion film blowing on the plastic raw material for the outer layer film, the plastic raw material for the middle layer film and the plastic raw material for the bottom layer film by using three film blowing machines and a three-layer co-extrusion die head, wherein the blown films are three-layer co-extrusion mulching films.
Preferably, the twin-screw extruder is configured in 360mm × 15 sections, wherein the number of sections of the front section is 1-7 sections, and the number of sections of the rear section is 8-15 sections.
Preferably, the proportion of the polymethyl ethylene carbonate, the suberic acid and the plasticizer in the step (2) is two thirds of the total amount, and the proportion of the polyurethane is 20-25%.
Preferably, in the step (3), the proportion of the PPC, the PBAT, the suberic acid and the plasticizer is one twelfth of the total amount, and the proportion of the polyurethane is 5-7.5%.
Preferably, in the step (4), the proportion of the PPC, the PBAT, the suberic acid and the plasticizer is three-twelfth of the total amount, and the proportion of the polyurethane is 5-7.5%.
(III) advantageous effects
Compared with the prior art, the invention provides the high weather-resistant biodegradable mulching film special for cotton, which has the following beneficial effects:
1. this special high resistant biodegradable plastic film of waiting of cotton, biodegradable polyurethane through containing carbonate structure is as the main raw materials of plastic film, and after the plastic film was used to abandonment, its accessible biodegradable mode degraded, avoids the pollution destruction problem to the environment.
2. The special high-weather-resistance biodegradable mulching film for cotton directly prevents ultraviolet rays and oxygen from damaging the mulching film by using the components of the coloring agent, the antioxidant and the heat preservation agent on the surface of the mulching film through the arrangement of the outer layer film, so that the functions of ultraviolet resistance and the like of the mulching film are effectively improved, and the problem that the content of other raw materials is influenced and cannot effectively generate effects when the components are added into the bottom layer film and the middle layer film is also avoided.
3. The high-weather-resistance biodegradable mulching film special for cotton is directly prevented from polluting soil and plants and damaging the mulching film by scraping on the ground by using the components of the scratch-resistant auxiliary agent and the antifouling auxiliary agent through the arrangement of the bottom layer film, so that the performances of scraping resistance and the like of the mulching film are effectively improved, and the problems that the content of other raw materials is influenced and the effect cannot be effectively generated when the components are added into the outer layer film and the middle layer film are also avoided.
4. The high weather-resistant biodegradable mulching film special for cotton ensures the basic service performance of the mulching film as a bearing object by adding a large amount of components for increasing basic performances such as deformation, heat resistance, weather resistance and the like and controlling the content of biodegradable polyurethane occupying most of carbonate structures through the arrangement of the middle layer film, achieves the purpose of controlling the blocking rate to control the biodegradation time, and effectively prevents the problems of breakage, tearing, low service life and the like of the mulching film.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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.
The first embodiment is as follows: the high weather-resistant biodegradable mulching film special for cotton comprises the following raw materials in proportion: the paint comprises, by weight, 35% of biodegradable polyurethane containing a carbonate structure, 25% of PPC, 70% of PBAT, 70% of a solvent, 4% of a plasticizer, 4% of suberic acid, 1% of an ultraviolet absorber, 1% of an antioxidant, 1% of a delustering agent, 1% of a heat-resistant stabilizer, 1% of a weather-resistant stabilizer, 1% of a heat-insulating agent, 1% of a scratch-resistant auxiliary agent, 1% of an antifouling auxiliary agent and 1% of a coloring agent.
The solvent is polar carbamate solvent of esters, has water content less than or equal to 450ppm, and is mainly ethyl acetate.
The high weather-resistant biodegradable mulching film special for cotton comprises the following steps:
(1) preparing raw materials of the mulching film: the method comprises the steps of firstly preparing three containers, wherein the three containers are divided into a container A, a container B and a container C respectively, and adding a proper amount of solvent into the three containers, wherein the ratio of the solvent in the container A to the solvent in the container B to the solvent in the container C is 7:2: 1.
(2) Preparing an intermediate layer film: placing a container A into a heating device, then pouring two-thirds of PPC and PBAT of the total amount and 20% of polyurethane into the container A to be dissolved in a solvent, after the temperature is raised to 105 ℃, sequentially adding suberic acid and a plasticizer of the total amount and two-thirds of the total amount, then adding a delustering agent, a heat-resistant stabilizer, a weather-resistant stabilizer and a heat preservation agent, stirring for 3 hours, stopping heating and standing for 90 minutes after stirring, then injecting the mixture into a feed inlet of a double-screw extruder through a casting machine, configuring the double-screw extruder into 360mm multiplied by 15 sections, wherein the temperature of 1-7 sections is 170 ℃, the temperature of 8-15 sections is 200 ℃, reacting for 3 minutes, extruding, granulating underwater at 60 ℃, and drying to obtain the plastic raw material for the intermediate layer film.
(3) Preparing an outer layer film: placing a container C into a heating device, pouring PPC and PBAT with a half of the total amount and polyurethane with a proportion of 7.5% into the container C, dissolving in a solvent, heating to 80 ℃, adding suberic acid and a plasticizer with a half of the total amount, sequentially adding a coloring agent, an antioxidant and a heat insulating agent, stirring for 40 minutes, stopping heating after stirring, standing for 20 minutes, injecting the mixture into a feed inlet of a double-screw extruder through a casting machine, wherein the temperature of 1-7 sections is 170 ℃, the temperature of 8-15 sections is 200 ℃, reacting for 3 minutes, extruding, granulating under water at 60 ℃, and drying to obtain the plastic raw material for the outer-layer membrane.
(4) Preparing a bottom layer film: placing a container B into a heating device, then pouring PPC and PBAT with three-tenths of the total amount and 7.5% of polyurethane into the container B to be dissolved in a solvent, after the temperature is raised to 90 ℃, adding suberic acid and plasticizer with three-tenths of the total amount, then sequentially adding a scratch-resistant aid and an antifouling aid, stirring for 70 minutes, stopping heating and standing for 50 minutes after stirring, then injecting the mixture into a feed inlet of a double-screw extruder through a casting machine, wherein the temperature of 1-7 sections is 170 ℃, the temperature of 8-15 sections is 200 ℃, reacting for 3 minutes, extruding, granulating under water at 60 ℃, and drying to obtain the plastic raw material for the bottom layer film.
(5) And respectively carrying out three-layer co-extrusion film blowing on the plastic raw material for the outer layer film, the plastic raw material for the middle layer film and the plastic raw material for the bottom layer film by using three film blowing machines and a three-layer co-extrusion die head, wherein the blown films are three-layer co-extrusion mulching films.
The use of various chemical agents has been reduced to the plastic film under this embodiment to biodegradable polyurethane with a large amount of carbonic ester structures increases the whole degradability of plastic film, thereby under the prerequisite that keeps the wholeness ability in order to satisfy the user demand, to the pollution problem of environment when reducing its degradation by a wide margin, can adopt this embodiment to the plastic film of part short-term use.
Example two: the high weather-resistant biodegradable mulching film special for cotton comprises the following raw materials in proportion: 15% of biodegradable polyurethane containing a carbonate structure, 15% of PPC, 40% of PBAT, 90% of solvent, 8% of plasticizer, 8% of suberic acid, 2% of ultraviolet absorbent, 2% of antioxidant, 2% of flatting agent, 2% of heat-resistant stabilizer, 2% of weather-resistant stabilizer, 2% of heat-insulating agent, 2% of scratch-resistant auxiliary agent, 2% of antifouling auxiliary agent and 2% of coloring agent.
The solvent is polar carbamate solvent of esters, has water content less than or equal to 450ppm, and is mainly ethyl acetate.
The high weather-resistant biodegradable mulching film special for cotton comprises the following steps:
(1) preparing raw materials of the mulching film: the method comprises the steps of firstly preparing three containers, wherein the three containers are divided into a container A, a container B and a container C respectively, and adding a proper amount of solvent into the three containers, wherein the ratio of the solvent in the container A to the solvent in the container B to the solvent in the container C is 3:2: 1.
(2) Preparing an intermediate layer film: placing a container A into a heating device, then pouring two-thirds of PPC and PBAT of the total amount and 5% of polyurethane into the container A to be dissolved in a solvent, heating to 80 ℃, then sequentially adding suberic acid and a plasticizer of the total amount, then adding a delustering agent, a heat-resistant stabilizer, a weather-resistant stabilizer and a heat insulating agent, stirring for 1 hour, stopping heating and standing for 70 minutes after stirring, then injecting the mixture into a feed inlet of a double-screw extruder through a casting machine, wherein the configuration of the double-screw extruder is 360mm multiplied by 15 sections, the temperature of 1-7 sections is 130 ℃, the temperature of 8-15 sections is 150 ℃, reacting for 1.5 minutes, granulating under water at 30 ℃, and drying to obtain the plastic raw material for the intermediate layer film.
(3) Preparing an outer layer film: placing a container C into a heating device, pouring PPC and PBAT with a half of the total amount and polyurethane with 5 percent of the total amount into the container C to be dissolved in a solvent, heating to 60 ℃, adding suberic acid and plasticizer with a half of the total amount, sequentially adding a coloring agent, an antioxidant and a heat preservation agent, stirring for 30 minutes, stopping heating and standing for 10 minutes after stirring, injecting the mixture into a feed inlet of a double-screw extruder through a casting machine, wherein the temperature of 1-7 sections is 130 ℃, the temperature of 8-15 sections is 150 ℃, reacting for 1.5 minutes, extruding, granulating under water at 30 ℃, and drying to obtain the plastic raw material for the outer-layer membrane.
(4) Preparing a bottom layer film: placing a container B into a heating device, then pouring PPC and PBAT with three-tenths of the total amount and polyurethane with 5 percent into the container B to be dissolved in a solvent, after the temperature is raised to 70 ℃, adding suberic acid and plasticizer with three-tenths of the total amount, then sequentially adding a scratch-resistant aid and an antifouling aid, stirring for 50 minutes, stopping heating and standing for 40 minutes after stirring, then injecting the mixture into a feed inlet of a double-screw extruder through a casting machine, wherein the temperature of 1-7 sections is 130 ℃, the temperature of 8-15 sections is 150 ℃, reacting for 1.5 minutes, extruding, granulating underwater at 30 ℃, and drying to obtain the plastic raw material for the bottom layer film.
(5) And respectively carrying out three-layer co-extrusion film blowing on the plastic raw material for the outer layer film, the plastic raw material for the middle layer film and the plastic raw material for the bottom layer film by using three film blowing machines and a three-layer co-extrusion die head, wherein the blown films are three-layer co-extrusion mulching films.
The plastic film under this embodiment has increased the use of various chemical agents to promote the wholeness ability of plastic film by a wide margin, guarantee the life and the use strength of plastic film, can adopt this embodiment to the plastic film of part long-term use.
Example three: the high weather-resistant biodegradable mulching film special for cotton comprises the following raw materials in proportion: 25% of biodegradable polyurethane containing a carbonate structure, 20% of PPC, 60% of PBAT, 80% of solvent, 6% of plasticizer, 6% of suberic acid, 1.5% of ultraviolet absorbent, 1.5% of antioxidant, 1.5% of flatting agent, 1.5% of heat-resistant stabilizer, 1.5% of weather-resistant stabilizer, 1.5% of heat-insulating agent, 1.5% of scratch-resistant auxiliary agent, 1.5% of antifouling auxiliary agent and 1.5% of coloring agent.
The solvent is polar carbamate solvent of esters, has water content less than or equal to 450ppm, and is mainly ethyl acetate.
The high weather-resistant biodegradable mulching film special for cotton comprises the following steps:
(1) preparing raw materials of the mulching film: the method comprises the steps of firstly preparing three containers, wherein the three containers are divided into a container A, a container B and a container C, and adding proper amount of solvent into the three containers, wherein the ratio of the solvent in the container A to the solvent in the container B to the solvent in the container C is 5:3: 1.5.
(2) Preparing an intermediate layer film: placing a container A into a heating device, then pouring two-thirds of PPC and PBAT of the total amount and 9% of polyurethane into the container A to be dissolved in a solvent, heating to 90 ℃, then sequentially adding suberic acid and a plasticizer of the total amount, then adding a delustering agent, a heat-resistant stabilizer, a weather-resistant stabilizer and a heat insulating agent, stirring for 2 hours, stopping heating after stirring, standing for 80 minutes, then injecting the mixture into a feed inlet of a double-screw extruder through a casting machine, configuring the double-screw extruder into 360mm multiplied by 15 sections, wherein the temperature of 1-7 sections is 150 ℃, the temperature of 8-15 sections is 180 ℃, reacting for 2.5 minutes, granulating under water at 45 ℃, and drying to obtain the plastic raw material for the intermediate layer film.
(3) Preparing an outer layer film: placing a container C into a heating device, pouring PPC and PBAT with a half of the total amount and polyurethane with 8 percent into the container C to be dissolved in a solvent, heating to 70 ℃, adding suberic acid and plasticizer with a half of the total amount, sequentially adding a coloring agent, an antioxidant and a heat preservation agent, stirring for 35 minutes, stopping heating after stirring, standing for 15 minutes, injecting the mixture into a feed inlet of a double-screw extruder through a casting machine, wherein the temperature of 1-7 sections is 150 ℃, the temperature of 8-15 sections is 180 ℃, reacting for 2.5 minutes, carrying out extrusion, carrying out underwater granulation at 45 ℃, and drying to obtain the plastic raw material for the outer-layer membrane.
(4) Preparing a bottom layer film: placing a container B into a heating device, then pouring PPC and PBAT with three-tenths of the total amount and polyurethane with 8 percent into the container B to be dissolved in a solvent, after the temperature is raised to 80 ℃, adding suberic acid and plasticizer with three-tenths of the total amount, then sequentially adding a scratch-resistant aid and an antifouling aid, stirring for 60 minutes, stopping heating and standing for 45 minutes after stirring, then injecting the mixture into a feed inlet of a double-screw extruder through a casting machine, wherein the temperature of 1-7 sections is 150 ℃, the temperature of 8-15 sections is 180 ℃, reacting for 2.5 minutes, carrying out extrusion, carrying out underwater granulation at 45 ℃, and drying to obtain the plastic raw material for the bottom layer film.
(5) And respectively carrying out three-layer co-extrusion film blowing on the plastic raw material for the outer layer film, the plastic raw material for the middle layer film and the plastic raw material for the bottom layer film by using three film blowing machines and a three-layer co-extrusion die head, wherein the blown films are three-layer co-extrusion mulching films.
The mulch film in the embodiment averagely adjusts the content of the biodegradable polyurethane containing the carbonate structure and various chemical agents, and averagely averages the overall performance and degradability of the mulch film, so that common use requirements are suitable for the embodiment.
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 (7)
1. The special high weather-resistant biodegradable mulching film for cotton is characterized in that: comprises the following raw materials in proportion: 15-35% of biodegradable polyurethane containing a carbonate structure, 15-25% of PPC, 40-70% of PBAT, 70-90% of solvent, 4-8% of plasticizer, 4-8% of suberic acid, 1-2% of ultraviolet absorbent, 1-2% of antioxidant, 1-2% of flatting agent, 1-2% of heat-resistant stabilizer, 1-2% of weather-resistant stabilizer, 1-2% of heat-insulating agent, 1-2% of scratch-resistant auxiliary agent, 1-2% of antifouling auxiliary agent and 1-2% of coloring agent.
2. The special high weather-resistant biodegradable mulching film for cotton according to claim 1, wherein: the solvent is polar carbamate solvent of esters, the water content is less than or equal to 450ppm, and the solvent is mainly ethyl acetate.
3. The special high weather-resistant biodegradable mulching film for cotton is characterized in that: the method comprises the following steps: the method comprises the following steps:
(1) preparing raw materials of the mulching film: preparing three containers, namely a container A, a container B and a container C, adding a proper amount of solvent into the three containers, wherein the ratio of the solvent in the container A to the solvent in the container B to the solvent in the container C is 3-7: 2-4: 1-2;
(2) preparing an intermediate layer film: placing a container A into a heating device, pouring a proper amount of polyurethane, PPC and PBAT into the container A to be dissolved in a solvent, heating to 80-105 ℃, sequentially adding a proper amount of suberic acid and a plasticizer, then adding a flatting agent, a heat-resistant stabilizer, a weather-resistant stabilizer and a heat-insulating agent, stirring for 1-3 hours, stopping heating and standing for 70-90 minutes after stirring, injecting the mixture into a feed inlet of a double-screw extruder through a casting machine, wherein the temperature of the front section is 130-170 ℃, the temperature of the rear section is 150-200 ℃, reacting for 1.5-3 minutes, carrying out extrusion, carrying out underwater granulation at 30-60 ℃, and drying to obtain a plastic raw material for an intermediate layer film;
(3) preparing an outer layer film: placing a container C into a heating device, pouring a proper amount of polyurethane, PPC and PBAT into the container C, dissolving the polyurethane, PPC and PBAT into a solvent, heating to 60-80 ℃, adding a proper amount of suberic acid and a plasticizer, sequentially adding a coloring agent, an antioxidant and a heat insulating agent, stirring for 30-40 minutes, stopping heating after stirring, standing for 10-20 minutes, injecting the mixture into a feed inlet of a double-screw extruder through a casting machine, wherein the temperature of the front section is 130-170 ℃, the temperature of the rear section is 150-200 ℃, reacting for 1.5-3 minutes, carrying out underwater granulation at 30-60 ℃, and drying to obtain a plastic raw material for the outer-layer membrane;
(4) preparing a bottom layer film: placing a container B into a heating device, pouring a proper amount of polyurethane, PPC and PBAT into the container B, dissolving the polyurethane, PPC and PBAT into a solvent, heating to 70-90 ℃, adding a proper amount of suberic acid and a plasticizer, sequentially adding a scratch-resistant assistant and an antifouling assistant, stirring for 50-70 minutes, stopping heating and standing for 40-50 minutes after stirring, injecting the mixture into a feed inlet of a double-screw extruder through a casting machine, wherein the temperature of the front section is 130-170 ℃, the temperature of the rear section is 150-200 ℃, reacting for 1.5-3 minutes, carrying out underwater granulation at 30-60 ℃, and drying to obtain a plastic raw material for the bottom layer film;
(5) and respectively carrying out three-layer co-extrusion film blowing on the plastic raw material for the outer layer film, the plastic raw material for the middle layer film and the plastic raw material for the bottom layer film by using three film blowing machines and a three-layer co-extrusion die head, wherein the blown films are three-layer co-extrusion mulching films.
4. The special high weather-resistant biodegradable mulching film for cotton according to claim 3, wherein: the configuration of the double-screw extruder is 360mm multiplied by 15 sections, wherein the number of sections of the front section is 1-7 sections, and the number of sections of the rear section is 8-15 sections.
5. The special high weather-resistant biodegradable mulching film for cotton according to claim 3, wherein: in the step (2), the proportion of the polymethyl ethylene carbonate, the suberic acid and the plasticizer is two thirds of the total amount, and the proportion of the polyurethane is 20-25%.
6. The special high weather-resistant biodegradable mulching film for cotton according to claim 3, wherein: in the step (3), the proportion of the PPC, the PBAT, the suberic acid and the plasticizer is one twelfth of the total amount, and the proportion of the polyurethane is 5-7.5%.
7. The special high weather-resistant biodegradable mulching film for cotton according to claim 3, wherein: in the step (4), the proportion of the PPC, the PBAT, the suberic acid and the plasticizer is three-twelfth of the total amount, and the proportion of the polyurethane is 5-7.5%.
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