CN115477790A - Heat-preserving and light-biological double-degradation plastic and preparation method and application thereof - Google Patents
Heat-preserving and light-biological double-degradation plastic and preparation method and application thereof Download PDFInfo
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Abstract
The invention discloses a plastic with heat preservation and photo-biological double degradation, a preparation method and an application thereof, wherein the plastic comprises the following raw materials in parts by weight: 50-90 parts of biodegradable high polymer material, 5-40 parts of reinforcing agent and 1-20 parts of MXene two-dimensional material modified by hydrophobic association polymer. The light-biological double-degradable plastic provided by the invention combines the photothermal conversion performance of MXene two-dimensional materials, the photocatalytic degradation function of oxidation products and the biodegradability of biodegradable high polymer materials, and can be naturally degraded in a natural environment after the heat preservation function of the heat preservation mulching film is exerted. Meanwhile, the plastic can adjust the photo-thermal conversion performance and the degradation time period of the MXene two-dimensional material and the biodegradable high polymer material by adjusting the mass ratio of the MXene two-dimensional material to the biodegradable high polymer material so as to meet the cultivation requirements of different crops.
Description
Technical Field
The invention relates to the field of degradable plastics, in particular to a light-biological double-degradable plastic with heat preservation and a preparation method and application thereof.
Background
The plastic products bring convenience to daily life of people and bring serious pollution problems, and most of the plastic products are left in the environment after completing the mission to cause serious white pollution. With the increasing consumption of plastic products, about 120 hundred million tons of waste plastics are estimated to be available in the whole world in 2050, about half of the waste plastics belong to disposable plastic products, are difficult to degrade and recover, exist in the environment for a long time, pollute soil, rivers and oceans, and even finally return to human bodies through food chains, and pose serious threats to human health. Incineration and landfill, while reducing the waste plastics in the environment to some extent, some invisible pollution also becomes a killer to human health. The development of degradable plastics is therefore considered to be an effective way of fundamentally solving "white pollution".
The degradable plastics can be roughly divided into four categories of photodegradable plastics, biodegradable plastics, photo-biodegradable plastics and water degradable plastics according to the degradation mode. The photo-biological double-degradable plastic combining photo-degradation and biological degradation is an ideal degradable plastic, has a faster degradation rate which is usually more than 5 times of that of other degradable plastics, and the degradation product is environment-friendly and pollution-free. However, the photo-biodegradable plastics on the market are relatively few, which is mainly limited by the lack of suitable materials to achieve both photo-and biodegradation. Therefore, the development of photo-bio dual degradable plastics is still the focus of the research on the degradable plastics.
Disclosure of Invention
The first purpose of the invention is to provide a light-biological double-degradation plastic with heat preservation. The double-degradable plastic combines the photothermal conversion performance of MXene two-dimensional materials, the photocatalytic degradation function of oxidation products and the biodegradability of biodegradable plastics, and can be rapidly degraded in a natural environment after the double-degradable plastic is used for a heat preservation mulching film to play a role in heat preservation.
The second purpose of the invention is to provide a preparation method of the light-biological double-degradation plastic with heat preservation function.
The third purpose of the invention is to provide a degradable heat-preservation mulching film.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the invention provides a plastic with heat preservation and photo-biological double degradation, which comprises the following raw materials in parts by weight: 50-90 parts of biodegradable high polymer material, 5-40 parts of reinforcing agent and 1-20 parts of MXene two-dimensional material modified by hydrophobic association polymer.
The surface of the MXene two-dimensional nanosheet structure is modified with the hydrophobic association polymer, so that the MXene two-dimensional material is endowed with good processing performance, and the MXene photothermal conversion effect is not influenced.
Optionally, the average diameter of the MXene two-dimensional material is in the nanometer range, including but not limited to 1-1000 nm, 50-800 nm, 100-500 nm, 200-300 nm, and the like.
Optionally, the raw materials of the plastic with both heat preservation and photo-biological double degradation comprise: 65-75 parts of biodegradable high polymer material, 25-30 parts of reinforcing agent and 2-4 parts of MXene two-dimensional material modified by hydrophobic association polymer.
Optionally, in the MXene two-dimensional material modified by the hydrophobic association polymer, the mass ratio of the hydrophobic association polymer to the MXene two-dimensional material is 1:1-10; preferably 1:1-5; more preferably 1:1.
Optionally, the MXene two-dimensional material is any one or a combination of two or more of titanium carbide nanosheets, vanadium carbide nanosheets, tantalum carbide nanosheets and niobium carbide nanosheets; preferably titanium carbide nanoplates.
Optionally, the hydrophobically associative polymer is hydrophobically modified polyacrylamide or hydrophobically modified chitosan. The hydrophobic association polymer can better enhance the processability of the MXene two-dimensional material under the condition of not influencing the photothermal conversion effect of the MXene two-dimensional material.
Optionally, the preparation method of the hydrophobically modified polyacrylamide comprises the following steps:
mixing a surfactant, acrylamide, N-dodecyl acrylamide and deionized water, stirring for 12-15h in a nitrogen environment, heating to 45-50 ℃, adding potassium persulfate, reacting for 2-4h, cooling and purifying to obtain the aqueous emulsion.
Optionally, the mass ratio of the surfactant to the acrylamide to the N-dodecyl acrylamide to the potassium persulfate is 14-16.
Alternatively, the surfactants include, but are not limited to, octadecyl trimethyl ammonium bromide, octadecyl trimethyl ammonium chloride, sodium dodecyl benzene sulfonate, cocamidopropyl betaine, and the like.
Optionally, the biodegradable polymer material is any one or a combination of two or more of starch, polylactic acid, polybutylene terephthalate-adipate, polyhydroxyalkanoate, polypropylene carbonate, polycaprolactone, polydioxanone, and polyglycolic acid.
Optionally, the reinforcing agent is any one or a combination of two or more of polyvinyl chloride, polyethylene, polypropylene and polyvinyl alcohol.
In a second aspect, the invention provides a preparation method of the above plastic with heat preservation and photo-biological dual degradation, which comprises the following steps:
1) Adding a hydrophobic association polymer into the dispersion liquid of the MXene two-dimensional material, and performing ultrasonic dispersion to obtain the MXene two-dimensional material modified by the hydrophobic association polymer;
2) Mixing the MXene two-dimensional material modified by the hydrophobic association polymer, the reinforcing agent and the biodegradable high polymer material, and preparing the plastic with heat preservation and light-biological double degradation by adopting a molding processing technology.
Optionally, the conditions of the ultrasonic dispersion are: the power of the ultrasonic wave is 300-800W, and the time of the ultrasonic wave is 2-10h.
Optionally, the concentration of the MXene two-dimensional material in the dispersion liquid of the MXene two-dimensional material is 1-10mg/g.
The MXene two-dimensional material is dispersed in a certain amount of hydrophobic association polymer, and the hydrophobic association polymer is uniformly dispersed and modified on the surface of the MXene two-dimensional material through rapid ultrasound, so that the MXene two-dimensional material is endowed with good processability and excellent mechanical properties of double-degradation plastics, and the original photothermal conversion property and photodegradation property of the MXene two-dimensional material are not influenced.
Optionally, in the above method, the forming process comprises at least one of injection, extrusion, molding, calendering, foaming, winding, laminating, coating, casting.
Optionally, the forming process includes the following steps: extruding by a double-screw extruder, cooling and granulating, uniformly mixing in a high-speed mixer, and blow-molding to form a film by a film blowing machine.
The invention utilizes the ultrasound to uniformly coat/embed the hydrophobic association polymer on the surface and between the MXene two-dimensional material layers, thereby endowing the MXene two-dimensional material layers with good processing performance.
Alternatively, the extrusion is carried out at 130-150 ℃ by using a double-screw extruder.
In a third aspect, the invention provides a degradable heat-insulation mulching film, and the raw materials of the degradable heat-insulation mulching film comprise the heat-insulation and photo-biological double-degradation plastic.
It can be understood that the master batch prepared from the light-biological double-degradable plastic with heat preservation and light-biological double-degradable plastic can be directly subjected to blow molding to form a film for the degradable heat preservation mulching film, and can also be mixed with other additives and then subjected to blow molding to form the film.
Any range recited herein is intended to include the endpoints and any number between the endpoints and any subrange subsumed therein or defined therein.
The starting materials of the present invention are commercially available, unless otherwise specified, and the equipment used in the present invention may be any equipment conventionally used in the art or may be any equipment known in the art.
The invention has the following beneficial effects:
the light-biological double-degradable plastic provided by the invention combines the photothermal conversion performance of MXene two-dimensional materials, the photocatalytic degradation function of oxidation products and the biodegradability of biodegradable plastics, and can be naturally degraded in a natural environment after the photothermal conversion and heat preservation effects are exerted.
When the plastic with heat preservation and light-biological double degradation provided by the invention is used for a heat preservation mulching film, the plastic breaks about 20 days, crop seedlings can directly break the film without artificial film breaking, and the plastic can be completely degraded in a natural environment within three months after the mulching film plays a heat preservation role.
When the light-biological double-degradation plastic provided by the invention is used for the heat-preservation mulching film, the heat-preservation effect can be provided within at least 20 days, the growth speed of some crops can be accelerated, the growth period is advanced, and the maturity of the crops is promoted.
The light-biological double-degradable plastic with heat preservation and provided by the invention can adjust the photo-thermal conversion performance and the degradation time period thereof by adjusting the mass ratio of the MXene two-dimensional material to the biodegradable high polymer material so as to meet the requirements of different crops.
Drawings
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
Figure 1 shows a scanning electron microscope image of hydrophobically modified polyacrylamide-modified titanium carbide nanoplates of example 1;
FIG. 2 shows a tensile strength test chart of a plastic having both heat preservation and photo-bio dual degradation in example 1;
FIG. 3 shows the IR thermal imaging images of the plastic of example 1 with heat preservation and photo-biological double degradation as heat preservation mulching film on day 1 and day 23;
FIG. 4 is a graph showing the degradation degree versus time of the plastic of example 1 with both heat preservation and photo-bio degradation as a heat preservation mulching film;
FIG. 5 shows the IR thermal imaging of comparative example 1 when used as an insulating mulch film, on day 1.
Detailed Description
In order to make the technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
The insulation and degradation tests of the following examples and comparative examples were conducted on the same outdoor vegetable in the same period of time.
Example 1
The plastic with heat preservation and light-biological double degradation is provided, and comprises the following raw materials in percentage by mass:
70 parts of starch;
27 parts of polyvinyl chloride resin;
3 parts of hydrophobically modified polyacrylamide modified titanium carbide nanosheets (wherein the mass ratio of the hydrophobically modified polyacrylamide to the titanium carbide nanosheets is 1:1).
The preparation method comprises the following steps:
1) 15g of octadecyl trimethyl ammonium chloride, 14g of acrylamide, 0.3g N-dodecyl acrylamide, 450g of deionized water were added to a three-necked flask. Then nitrogen is introduced into the mixture, the mixture is stirred for 15 hours, then the mixture is heated to 50 ℃, and 0.5g of potassium persulfate is added to react for 3 hours. Then cooling, adding a proper amount of water and acetone to precipitate the polymer, and drying under reduced pressure for 24h to obtain the product, namely the hydrophobically modified polyacrylamide.
2) Adding the obtained hydrophobically modified polyacrylamide into an aqueous dispersion of titanium carbide nanosheets (6 mg/g) (the mass ratio of the two in the dispersion is 1:1), and performing ultrasonic dispersion for 2 hours (with the ultrasonic power of 400W) to obtain the hydrophobically modified polyacrylamide modified titanium carbide nanosheets (shown in figure 1).
3) Mixing starch, polyvinyl chloride resin and polyacrylamide modified titanium carbide nanosheets, extruding the mixture by using a double-screw extruder at 130-150 ℃, and cooling and granulating the mixture to obtain the master batch resin. Then the mixture is mixed in a high-speed mixer and blown into a film by a film blowing machine, the thickness of the film is about 10 microns, and the tensile strength test of the film is shown in figure 2, the tensile strength of the film is 15.7MPa, and the elongation at break is 237%.
Testing thermal insulation performance and degradation performance:
a1-square meter of outdoor vegetable field uniformly irradiated by sunlight is selected and divided into two parts with the same area, one part is covered by the plastic prepared by the embodiment and having the functions of heat preservation and light-biological double degradation, and the other part is marked as an experimental group without treatment and is marked as a control group. The photothermal conversion performance and the heat insulation performance of the material under sunlight and the degradation performance of the material in natural environment are respectively observed.
The results show that: on day 1, the surface temperature of the ground of the experimental group was measured to be 43.8 ℃ and the surface temperature of the ground of the control group was measured to be 27.5 ℃ at the same time point using an infrared camera. After 23 days of standing, the surface temperature of the floor of the experimental group was measured to be 37.6 deg.C (shown in FIG. 3) and the surface temperature of the floor of the control group was measured to be 26.9 deg.C at the same time point using an infrared camera. It can be seen that the vegetable field covered by the light-biological double-degradable plastic with heat preservation and light-biological double-degradable plastic prepared by the embodiment can raise the ground temperature of the vegetable field by 10-16 ℃, and keep the heat preservation for at least 23 days, and after 23 days, the ground temperature of the experimental group slowly drops. This is because although the titanium carbide nanosheets themselves have good photothermal conversion performance, the titanium carbide nanosheets are continuously oxidized in the air to titanium dioxide as time passes, and the photothermal conversion performance of the plastic film is reduced accordingly.
In addition, the plastic films of the experimental group began to crack in 26 days, crumble in 38 days, and powdering in 45 days, and the degradation rate reached 90% or more in 85 days, and fig. 4 is a graph showing the degradation degree of the plastic films as a function of time.
Example 2
The plastic with heat preservation and photo-biological double degradation is provided, and comprises the following raw materials in percentage by mass:
70 parts of starch;
25 parts of polyvinyl chloride resin;
5 parts of hydrophobically modified polyacrylamide modified titanium carbide nanosheets (wherein the mass ratio of the hydrophobically modified polyacrylamide to the titanium carbide nanosheets is 1:1).
The preparation method comprises the following steps:
1) 15g of octadecyl trimethyl ammonium chloride, 14g of acrylamide, 0.3g N-dodecyl acrylamide, 450g of deionized water were added to a three-necked flask. Then nitrogen is introduced into the mixture, the mixture is stirred for 15 hours, then the mixture is heated to 50 ℃, and potassium persulfate is added to react for 3 hours. Then cooling, adding a proper amount of water and acetone to precipitate the polymer, and drying under reduced pressure for 24h to obtain the product, namely the hydrophobically modified polyacrylamide.
2) Adding the obtained hydrophobic modified polyacrylamide into an aqueous dispersion of titanium carbide nanosheets (6 mg/g) (the mass ratio of the two in the dispersion is 1:1), and performing ultrasonic dispersion for 2 hours (the ultrasonic power is 400W) to obtain the dispersion of the hydrophobic modified polyacrylamide modified titanium carbide nanosheets.
3) Mixing starch, polyvinyl chloride resin and hydrophobically modified polyacrylamide modified titanium carbide nanosheets, extruding the mixture at 130-150 ℃ by using a double-screw extruder, and cooling and granulating the mixture to obtain the master batch resin. Then evenly mixing the materials in a high-speed mixer, and performing blow molding by using a film blowing machine to form a film, wherein the thickness of the film is about 10 microns, the tensile strength of the film is 10.6MPa, and the elongation at break is 198%.
Testing thermal insulation performance and degradation performance:
the test method was the same as in example 1.
The results show that: on day 1, the surface temperature of the experimental group ground measured by the infrared camera can reach 53.2 ℃ and the surface temperature of the control group ground can reach 27.5 ℃ at the same time point, and on day 20, the surface temperature of the experimental group ground measured by the infrared camera can reach 36.5 ℃ and the surface temperature of the control group ground can reach 28.0 ℃ at the same time point, so that the ground temperature of the vegetable field can be raised by 8-25 ℃ and kept for at least 20 days by covering the vegetable field with the light-biological double-degradable plastic prepared by the embodiment. In addition, the plastic films of the experimental group began to chalk after 35 days.
Example 3
70 parts of starch;
27 parts of polyvinyl chloride resin;
3 parts of hydrophobically modified chitosan modified graphene (the mass ratio of the hydrophobically modified chitosan to the titanium carbide nanosheet is 1:1).
The preparation method comprises the following steps:
1) Weighing 10g chitosan (molecular weight is 560000) dissolved in 1% (v/v) acetic acid solutionTo obtain a 1% (w/v) chitosan solution, adding 5g of dodecanal, stirring for two hours, adding NaOH solution to adjust the pH to 5. Mixing 10% NaBH 4 (0.4 g) and dodecanal (0.7 g) are added into the solution, then NaOH solution is added to adjust the pH value to 10, then the solution is stood until precipitation is separated out, filtration is carried out, water is used for washing the solution to be neutral, ethanol is used for extracting the solution to remove the residual dodecanal and inorganic matters, and drying is carried out to obtain the hydrophobic modified chitosan.
2) Adding the obtained hydrophobically modified chitosan into aqueous dispersion of titanium carbide nanosheets (6 mg/g) (the mass ratio of the titanium carbide nanosheets to the hydrophobically modified chitosan is 1:1), and ultrasonically dispersing for 2 hours by using a 400W ultrasonic cleaner to obtain the hydrophobically modified chitosan modified titanium carbide nanosheets.
3) Mixing the above materials in a high-speed mixer, extruding at 100-130 deg.C with a twin-screw extruder, cooling, and granulating to obtain the final product. Then evenly mixing the materials in a high-speed mixer, and performing blow molding by using a film blowing machine to form a film, wherein the thickness of the film is about 10 microns, the tensile strength of the film is 12.8MPa, and the elongation at break is 175%.
Testing thermal insulation performance and degradation performance:
the test method was the same as in example 1.
The results show that: on day 1, the surface temperature of the experimental group ground measured by the infrared camera can reach 40.5 ℃ and the surface temperature of the control group ground can reach 26.8 ℃ at the same time point, and on day 20, the surface temperature of the experimental group ground measured by the infrared camera can reach 35.9 ℃ and the surface temperature of the control group ground can reach 27.6 ℃ at the same time point, so that the ground temperature of the vegetable field can be raised by 8-14 ℃ and kept for at least 20 days by covering the vegetable field with the light-biological double-degradable plastic prepared by the embodiment. In addition, the plastic films of the experimental group began to chalk after 38 days.
Comparative example 1
The heat-preservation degradable plastic is provided, and comprises the following raw materials in percentage by mass:
70 parts of starch;
30 parts of polyvinyl chloride resin.
The preparation method comprises the following steps:
3) Mixing starch and polyvinyl chloride resin, extruding at 130-150 deg.C with a double screw extruder, cooling, and granulating to obtain the final product. Then evenly mixed in a high-speed mixer, and blown into a film by a film blowing machine.
Testing thermal insulation performance and degradation performance:
the test method was the same as in example 1.
The results show that: on day 1, at the same time point, the surface temperature of the floor of the experimental group was measured to be 33.2 ℃ by an infrared camera, while the surface temperature of the floor of the control group was measured to be 27.5 ℃ (the surface temperature on day 1 is shown in fig. 5), and the plastic film of the experimental group did not crack even when it was left for 45 days outdoors.
Comparative example 2
The plastic with heat preservation and light-biological double degradation is provided, and comprises the following raw materials in percentage by mass:
70 parts of starch;
27 parts of polyvinyl chloride resin;
3 parts of titanium carbide nanosheets.
The preparation method comprises the following steps:
mixing starch, polyvinyl chloride resin and titanium carbide nanosheets, extruding at 130-150 ℃ by using a double-screw extruder, cooling and granulating to obtain master batch resin, uniformly mixing in a high-speed mixer, and performing blow molding to form a film by using a film blowing machine.
As a result: when the double-screw extruder is used for extrusion, the photosensitizer is stacked and is difficult to enter the polyvinyl chloride resin to form a uniform composite material, and only a non-uniform base material with obvious agglomeration can be obtained.
Comparative example 3
The plastic with heat preservation and light-biological double degradation is provided, and comprises the following raw materials in percentage by mass:
70 parts of starch;
27 parts of polyvinyl chloride resin;
3 parts of hydrophobically modified polyacrylamide modified titanium carbide nanosheets (wherein the mass ratio of the hydrophobically modified polyacrylamide to the titanium carbide nanosheets is 2:1).
The preparation method comprises the following steps:
1) 15g of octadecyl trimethyl ammonium chloride, 14g of acrylamide, 0.3g N-dodecyl acrylamide, 450g of deionized water were added to a three-necked flask. Then nitrogen is introduced into the mixture, the mixture is stirred for 15 hours, then the mixture is heated to 50 ℃, and potassium persulfate is added to react for 3 hours. Then cooling, adding a proper amount of water and acetone to precipitate the polymer, and drying under reduced pressure for 24 hours to obtain the product, namely the hydrophobically modified polyacrylamide.
2) Adding the obtained hydrophobic modified polyacrylamide into aqueous dispersion of titanium carbide nanosheets (3 mg/g), and performing ultrasonic dispersion for 2 hours (ultrasonic power 400W) to obtain the dispersion of the hydrophobic modified polyacrylamide modified titanium carbide nanosheets.
3) Mixing starch, polyvinyl chloride resin and hydrophobically modified polyacrylamide modified titanium carbide nanosheets, extruding the mixture at 130-150 ℃ by using a double-screw extruder, and cooling and granulating the mixture to obtain the master batch resin. Then evenly mixed in a high-speed mixer, and blown into a film by a film blowing machine. The film had a thickness of about 10 microns, a tensile strength of 20.3MPa and an elongation at break of 268%.
Testing the heat preservation performance and the degradation performance:
the test method was the same as in example 1.
The results show that: on day 1, at the same time point, the surface temperature of the ground of the experimental group was measured to be 38.6 ℃ by an infrared camera, while the surface temperature of the ground of the control group was measured to be 27.5 ℃.
In addition, the plastic films of the experimental groups started to chalk after being left for 53 days outdoors.
It should be understood that the above-described embodiments of the present invention are examples for clearly illustrating the invention, and are not to be construed as limiting the embodiments of the present invention, and it will be obvious to those skilled in the art that various changes and modifications can be made on the basis of the above description, and it is not intended to exhaust all embodiments, and obvious changes and modifications can be made on the basis of the technical solutions of the present invention.
Claims (10)
1. The plastic with heat preservation and light-biological double degradation is characterized by comprising the following raw materials in parts by weight: 50-90 parts of biodegradable high polymer material, 5-40 parts of reinforcing agent and 1-20 parts of MXene two-dimensional material modified by hydrophobic association polymer.
2. The plastic with heat preservation and light-biological double degradation as claimed in claim 1, wherein the weight ratio of the hydrophobic association polymer to the MXene two-dimensional material in the MXene two-dimensional material modified by the hydrophobic association polymer is 1:1-10.
3. The plastic with heat preservation and photo-biological double degradation functions as claimed in claim 1, wherein the MXene two-dimensional material is any one of titanium carbide nanosheets, vanadium carbide nanosheets, tantalum carbide nanosheets and niobium carbide nanosheets or a combination of two or more thereof.
4. The plastic with both heat preservation and photo-biological double degradation of claim 1, wherein the hydrophobically associating polymer is hydrophobically modified polyacrylamide or hydrophobically modified chitosan.
5. The plastic with both heat preservation and photo-biological degradation as claimed in claim 4, wherein the preparation method of the hydrophobically modified polyacrylamide comprises the following steps:
mixing a surfactant, acrylamide, N-dodecyl acrylamide and deionized water, stirring for 12-15h in a nitrogen environment, heating to 45-50 ℃, adding potassium persulfate to react for 2-4h, cooling and purifying to obtain the aqueous emulsion;
preferably, the mass ratio of the surfactant to the acrylamide to the N-dodecyl acrylamide to the potassium persulfate is 14-16.
6. The plastic with heat preservation and photo-biological double degradation functions as claimed in claim 1, wherein the biodegradable polymer material is any one or a combination of two or more of starch, polylactic acid, polybutylene terephthalate-adipate, polyhydroxyfatty acid, polypropylene carbonate, polycaprolactone, polydioxanone and polyglycolic acid;
preferably, the reinforcing agent is any one or a combination of two or more of polyvinyl chloride, polyethylene, polypropylene and polyvinyl alcohol.
7. The method for preparing the plastic with heat preservation and light-biological double degradation as claimed in any one of claims 1 to 6, which comprises the following steps:
1) Adding a hydrophobic association polymer into the dispersion liquid of the MXene two-dimensional material, and performing ultrasonic dispersion to obtain the MXene two-dimensional material modified by the hydrophobic association polymer;
2) Mixing the MXene two-dimensional material modified by the hydrophobic association polymer, the reinforcing agent and the biodegradable high polymer material, and preparing the plastic with heat preservation and light-biological double degradation by adopting a molding processing technology.
8. The method of claim 7, wherein the forming process comprises at least one of injection, extrusion, molding, calendaring, foaming, winding, laminating, coating, casting;
preferably, the conditions of the ultrasonic dispersion are: the power of the ultrasonic wave is 300-800W, and the time of the ultrasonic wave is 2-10h.
9. The method according to claim 7, wherein the molding process comprises the steps of: extruding by a double-screw extruder, cooling and granulating, uniformly mixing in a high-speed mixer, and performing blow molding by a film blowing machine to form a film.
10. A degradable heat-preservation mulching film is characterized in that the raw materials of the degradable heat-preservation mulching film comprise the heat-preservation and light-biological double-degradation plastic as claimed in any one of claims 1 to 6.
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| US20180213730A1 (en) * | 2015-10-21 | 2018-08-02 | 9298-6876 Québec Inc. | Bio-polymer mulch film and process for manufacturing same |
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