CN115521588A - Full-biodegradable film, preparation method thereof and application thereof in mulching film - Google Patents
Full-biodegradable film, preparation method thereof and application thereof in mulching film Download PDFInfo
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- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
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- 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
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- C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
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- C08J2467/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
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Abstract
The invention relates to the technical field of degradable materials, and provides a full-biodegradable film, a preparation method thereof and application thereof in mulching films. The preparation raw materials of the full-biodegradable film provided by the invention comprise poly (butylene adipate)/terephthalate, polylactic acid, talcum powder, an antioxidant, an anti-ultraviolet master batch, a cross-linking agent, a lubricant and a powder coating agent. According to the invention, by adding the anti-ultraviolet master batch, the weather resistance of the full-biodegradable film can be improved, and the ultraviolet aging speed of the full-biodegradable film can be effectively relieved; in addition, the lubricant and the dispersant added in the invention are beneficial to uniformly dispersing the polybutylene adipate/terephthalate and the polylactic acid after melting, and the cross-linking agent can react with hydroxyl and carboxyl in the polybutylene adipate/terephthalate and the polylactic acid, thereby improving the compatibility of the polybutylene adipate/terephthalate and the polylactic acid. The fully biodegradable film disclosed by the invention is used as a mulching film, so that the functional time of the mulching film can be prolonged, the soil moisture preservation and heat preservation performance of the mulching film can be improved, and the crop yield can be effectively improved.
Description
Technical Field
The invention belongs to the technical field of degradable materials, and particularly relates to a full-biodegradable film, a preparation method thereof and application thereof in a mulching film.
Background
At present, the films such as plastic bags, mulching films and the like are mainly polyethylene films, so that a large amount of white pollution is caused, and the health and sustainable development of human beings are influenced more and more. Non-degradable materials are being reviewed for benign replacement. The existing full-biodegradable materials are gradually popularized and applied due to the excellent degradation performance and the environmental friendliness, and particularly in the aspect of film bags.
Among the existing full-biodegradable materials, poly (butylene adipate)/terephthalate) and polylactic acid are one of the widely applied full-biodegradable materials, and have a large number of applications in film bag products. But the pure poly (butylene adipate/terephthalate) has low strength, high elongation, high strength of polylactic acid and low elongation; the compatibility of the two is poor, the local mechanical property and the weather resistance of the film are easily lower than the standard requirements, and the local soil moisture preservation and water retention property is easier to lose. Meanwhile, the product has the problem of poor weather resistance, cannot meet the long service cycle required by a finished product, and further has accelerated reduction of the weather resistance under outdoor illumination and high humidity.
Disclosure of Invention
In view of this, the invention provides a full-biodegradable film, a preparation method thereof and an application thereof in a mulching film. The poly (butylene adipate)/terephthalate) and polylactic acid in the fully biodegradable film provided by the invention have good compatibility, good weather resistance and long service cycle.
In order to achieve the above object, the present invention provides the following technical solutions:
a full-biodegradable film is prepared from the following raw materials in parts by mass: 70-90% of poly (butylene adipate/terephthalate), 3-10% of polylactic acid, 2-15% of talcum powder, 0.5-1.5% of antioxidant, 2-7% of anti-ultraviolet master batch, 0.07-0.15% of cross-linking agent, 0.8-1.5% of lubricant and 0.1-0.4% of powder coating agent;
the preparation raw materials of the uvioresistant master batch comprise the following components in percentage by mass: 67-80% of poly-adipic acid/butylene terephthalate, 18-30% of ultraviolet agent, 0.2-0.6% of antioxidant 1010, 0.5-1% of polyethylene wax and 0.5-1.5% of dispersing agent.
Preferably, the antioxidant for preparing the fully biodegradable film comprises one or more of pentaerythritol tetrakis [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ], tris [2, 4-di-tert-butylphenyl ] phosphite and 4, 4-thiobis (6-tert-butyl-3-methylphenol).
Preferably, the cross-linking agent is one or more of chain extenders KL-E4370B, BP-96 and triglycidyl isocyanurate; the powder coating agent is a coating agent 222.
Preferably, the lubricant is one or more of polyethylene wax, monoglycerides and pentaerythrityl tetrastearate.
Preferably, the ultraviolet agent is one or more of an ultraviolet light absorber and a radical scavenger.
Preferably, the ultraviolet light absorber is one or more of uv-234, uv-5686, uv-531 and uv-326, and the radical scavenger is one or more of uv-944, uv-783, uv-623, bsf-2020 and uv-902.
The invention also provides a preparation method of the full-biodegradable film, which comprises the following steps:
blending and extruding raw materials for preparing the full-biodegradable film to obtain granules;
and blowing the granules to obtain the full-biodegradable film.
Preferably, the temperature of the blown film is 170-175 ℃, and the blow-up ratio is 2.5-2.8.
The invention also provides the application of the full-biodegradable film prepared by the preparation method in the scheme or the full-biodegradable film prepared by the preparation method in the scheme in a mulching film.
Preferably, the thickness of the mulching film is 0.008-0.012 mm.
The invention provides a full-biodegradable film, which is prepared from the following raw materials in parts by mass: 70-90% of poly (butylene adipate/terephthalate), 3-10% of polylactic acid, 2-15% of talcum powder, 0.5-1.5% of antioxidant, 2-7% of anti-ultraviolet master batch, 0.07-0.15% of cross-linking agent, 0.8-1.5% of lubricant and 0.1-0.4% of powder coating agent; the preparation raw materials of the uvioresistant master batch comprise the following components: 67-80% of poly-adipic acid/butylene terephthalate, 18-30% of ultraviolet agent, 0.2-0.6% of antioxidant 1010, 0.5-1% of polyethylene wax and 0.5-1.5% of dispersant. According to the invention, by adding the anti-ultraviolet master batch, the weather resistance of the full-biodegradable film can be improved, the ultraviolet aging speed of the full-biodegradable film can be effectively relieved, the obtained film still has good weather resistance under outdoor illumination and high humidity, and the service cycle is prolonged; in addition, the lubricant and the dispersant added in the invention are beneficial to uniformly dispersing the molten poly (butylene adipate/terephthalate) and the polylactic acid, and the cross-linking agent can react with hydroxyl and carboxyl in the poly (butylene adipate/terephthalate) and the polylactic acid, thereby improving the compatibility of the poly (butylene adipate/terephthalate) and the polylactic acid. The fully biodegradable film is used as a mulching film, so that the functional time of the mulching film can be prolonged, the soil moisture preservation and heat preservation performance of the mulching film can be improved, and the crop yield can be effectively improved.
Drawings
FIG. 1 is a graph showing the change in elongation at break in the transverse direction of the fully biodegradable films prepared in examples 1 to 6;
FIG. 2 is a graph showing the change in elongation at break in the machine direction of the fully biodegradable films prepared in examples 1 to 6;
FIG. 3 is a graph showing the change in transverse tensile strength of the fully biodegradable films prepared in examples 1 to 6;
FIG. 4 is a graph showing the change in longitudinal tensile strength of the fully biodegradable films prepared in examples 1 to 6.
Detailed Description
The invention provides a full-biodegradable film, which comprises the following raw materials in parts by mass: 70 to 90 percent of poly-adipic acid/butylene terephthalate, 3 to 10 percent of polylactic acid, 2 to 15 percent of talcum powder, 0.5 to 1.5 percent of antioxidant, 2 to 7 percent of anti-ultraviolet master batch, 0.07 to 0.15 percent of cross-linking agent, 0.8 to 1.5 percent of lubricant and 0.1 to 0.4 percent of powder coating agent;
the preparation raw materials of the uvioresistant master batch comprise the following components in percentage by mass: 67-80% of poly-adipic acid/butylene terephthalate, 18-30% of ultraviolet agent, 0.2-0.6% of antioxidant 1010, 0.5-1% of polyethylene wax and 0.5-1.5% of dispersing agent.
Unless otherwise specified, the starting materials for the preparation used in the present invention are commercially available.
The preparation raw material of the full-biodegradable film comprises 70-90% of poly (adipic acid)/butylene terephthalate (PBAT), preferably 75-85% by mass fraction. In the present invention, the number average molecular weight of PBAT is preferably 110000 to 140000.
The raw materials for preparing the full-biodegradable film comprise 3-10% of polylactic acid by mass fraction, and preferably 5-8% of polylactic acid by mass fraction. In the present invention, the number average molecular weight of the polylactic acid is preferably 160000 to 200000.
The preparation raw material of the full-biodegradable film comprises 2-15% of talcum powder, preferably 5-12% by mass. In the present invention, the particle size of the talc powder is preferably 5 μm or less (3000 mesh or more), and more preferably 2 to 5 μm.
The preparation raw material of the full-biodegradable film comprises 0.5-1.5% of antioxidant, preferably 0.8-1% by mass. In the present invention, the antioxidant preferably includes one or more of pentaerythritol tetrakis [ β - (3, 5-di-t-butyl-4-hydroxyphenyl) propionate ], tris [2, 4-di-t-butylphenyl ] phosphite and 4, 4-thiobis (6-t-butyl-3-methylphenol), and when the antioxidant is a complex of pentaerythritol tetrakis [ β - (3, 5-di-t-butyl-4-hydroxyphenyl) propionate ] and tris [2, 4-di-t-butylphenyl ] phosphite, the mass ratio of pentaerythritol tetrakis [ β - (3, 5-di-t-butyl-4-hydroxyphenyl) propionate ] and tris [2, 4-di-t-butylphenyl ] phosphite is preferably 1, and in a specific embodiment of the present invention, an antioxidant of type B125 is preferably used.
The preparation raw materials of the full-biodegradable film comprise 2-7% of the uvioresistant master batch, and preferably 3-5% of the uvioresistant master batch. In the invention, the preparation raw materials of the ultraviolet-resistant master batch comprise the following components in percentage by mass: 70-80% of poly-adipic acid/butylene terephthalate, 20-30% of ultraviolet agent, 0.2-0.5% of antioxidant 1010, 0.5-1% of polyethylene wax and 0.5-0.9% of dispersant.
In the invention, the preparation raw material of the uvioresistant master batch comprises 67-80% of poly (adipic acid)/butylene terephthalate, preferably 70-75%; the number average molecular weight of the poly (butylene adipate)/terephthalate) is consistent with the scheme, and the description is omitted; the preparation raw materials of the ultraviolet resistant master batch comprise 18 to 30 percent of ultraviolet agent, preferably 20 to 25 percent; the ultraviolet agent is preferably one or more of an ultraviolet light absorber and a free radical trapping agent; the ultraviolet light absorbent is preferably one or more of uv-234, uv-5686, uv-531 and uv-326, and the radical scavenger is preferably one or more of uv-944, uv-783, uv-623, bsf-2020 and uv-902; in a specific embodiment of the present invention, the ultraviolet agent is preferably a compound of an ultraviolet light absorber and a radical scavenger, and the mass ratio of the ultraviolet light absorber to the radical scavenger in the compound is preferably 0.3 to 0.6, and more preferably 0.5; the ultraviolet light absorber in the compound is uv-234, the free radical scavenger is a compound of uv-944 and uv-623, and the mass ratio of uv-944 to uv-623 is preferably 1. In the invention, the preparation raw materials of the uvioresistant master batch comprise 0.2-0.6% of antioxidant 1010, preferably 0.3-0.5%, 0.5-1% of polyethylene wax, preferably 0.6-0.8%, and 0.5-1.5% of dispersant, preferably 0.6-1%; the dispersant is preferably a powder coating agent 222.
In the invention, the preparation method of the uvioresistant master batch is preferably as follows: blending and extruding the raw materials for preparing the ultraviolet-resistant master batch to obtain the ultraviolet-resistant master batch; the type of an extruder used in the extrusion process is consistent with the extrusion conditions for preparing the full-biodegradable film; according to the sequence of passing through the raw materials, the extruder comprises 9 heating sections, which are sequentially marked as a first section to a ninth section, the temperature of the first section is preferably 145-150 ℃, the temperature of the second section is preferably 155-160 ℃, the temperature of the third section is preferably 160-165 ℃, the temperature of the fourth section is preferably 165-170 ℃, the temperature of the fifth section is preferably 165-170 ℃, the temperature of the sixth section is preferably 170-175 ℃, the temperature of the seventh section is preferably 165-170 ℃, the temperature of the eighth section is preferably 160-165 ℃, the temperature of the ninth section is preferably 160-165 ℃, the die head temperature of the extruder is preferably 160-165 ℃, and the melt temperature is preferably 160-165 ℃. When the ultraviolet resistant master batch is prepared, the highest temperature of the extruder is controlled to be 170-175 ℃, which is 5 ℃ lower than the highest temperature of the extruder when a film is prepared, so that the influence of heat on the ultraviolet resistant agent can be reduced.
The preparation raw material of the full-biodegradable film comprises 0.07-0.15% of cross-linking agent, preferably 0.09-0.12% by mass fraction. In the invention, the cross-linking agent is preferably one or more of chain extenders KL-E4370B, BP-96 and silane coupling agent KH-550.
The raw materials for preparing the full-biodegradable film comprise 0.8-1.5% of lubricant, preferably 1-1.2% by mass. In the present invention, the lubricant is preferably one or more of polyethylene wax, monoglycerides and pentaerythrityl tetrastearate; in a specific embodiment of the present invention, the lubricant is preferably a polyethylene wax and monoglyceride compound, and the mass ratio of the polyethylene wax to the monoglyceride in the compound is preferably 1.
The preparation raw material of the full-biodegradable film comprises 0.1-0.4% of powder coating agent, preferably 0.2-0.3% by mass fraction. In the present invention, the powder coating agent is preferably a coating agent 222.
The invention also provides a preparation method of the full-biodegradable film, which comprises the following steps:
blending and extruding raw materials for preparing the full-biodegradable film to obtain granules;
and blowing the granules to obtain the full-biodegradable film.
The invention blends and extrudes raw materials (poly (butylene adipate)/terephthalate, polylactic acid, talcum powder, antioxidant, uvioresistant master batch, cross-linking agent, lubricant and powder coating agent) for preparing the full-biodegradable film to obtain granules. In the invention, the blender mixer for blending has no special requirement, and the blender mixer well known by the technical personnel in the field can be adopted; the rotation speed of blending is preferably 720 revolutions per minute, and the time is preferably 2min; the extruder for extrusion is preferably an AK36 extruder in Nanjing Keya, and the length-diameter ratio is 40; according to the sequence of raw material passing, the extruder comprises 9 heating sections, which are sequentially marked as a first section to a ninth section, the temperature of the first section is preferably 145-150 ℃, the temperature of the second section is preferably 160-165 ℃, the temperature of the third section is preferably 165-170 ℃, the temperature of the fourth section is preferably 170-175 ℃, the temperature of the fifth section is preferably 175-180 ℃, the temperature of the sixth section is preferably 175-180 ℃, the temperature of the seventh section is preferably 170-175 ℃, the temperature of the eighth section is preferably 165-170 ℃, the temperature of the ninth section is preferably 160-165 ℃, the head temperature of the extruder is preferably 160-165 ℃, and the melt temperature is preferably 160-165 ℃. The pellets obtained by extrusion are preferably dried at a temperature of preferably 70 ℃ for a time of preferably 6 hours, preferably in a forced air drying oven.
After the granules are obtained, the invention carries out film blowing on the granules to obtain the full-biodegradable film. In the invention, the temperature of the blown film is preferably 170-175 ℃, the blow-up ratio is preferably 2.5-2.8, more preferably 2.6-2.7, and the thickness of the film obtained by the blown film is preferably 0.008-0.012 mm; and the film blowing is preferably performed by using a Yunfang film blowing machine.
The invention also provides the application of the full-biodegradable film prepared by the preparation method in the scheme or the full-biodegradable film prepared by the preparation method in the scheme in a mulching film. In the present invention, the thickness of the mulching film is preferably 0.008 to 0.012mm, and more preferably 0.009 to 0.010mm. The full-biodegradable film provided by the invention has good weather resistance, particularly has good weather resistance under outdoor illumination and high humidity conditions, is slow in ultraviolet aging speed, has excellent soil moisture preservation and heat preservation performance when being used as a mulching film, is long in functional time, and can effectively improve the crop yield.
The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
Example 1
The preparation raw materials of the fully biodegradable film provided in this example are as follows by mass fraction: 86.5 percent of poly (butylene adipate)/terephthalate), 4.3 percent of polylactic acid, 4.3 percent of talcum powder, 0.7 percent of antioxidant, 2.86 percent of anti-ultraviolet master batch, 0.12 percent of cross-linking agent, 1.05 percent of lubricant and 0.17 percent of powder coating agent 222.
Wherein the antioxidant is a compound (B125) of tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid ] pentaerythritol ester and tris [2, 4-di-tert-butylphenyl ] phosphite in a mass ratio of 1; the cross-linking agent is BP-96; the lubricant is a compound of polyethylene wax and monoglyceride, and the mass ratio of the polyethylene wax to the monoglyceride is 1.
The ultraviolet resistant master batch comprises the following components: 67.4 percent of poly-adipic acid/butylene terephthalate, 30 percent of ultraviolet agent, 0.6 percent of antioxidant 1010, 0.8 percent of polyethylene wax and 2221.2 percent of powder coating agent. Wherein, the ultraviolet agent is a compound of an ultraviolet absorbent and a free radical trapping agent, wherein the ratio of the ultraviolet absorbent to the free radical trapping agent is 0.5, the ultraviolet absorbent is uv-234, the free radical trapping agent is a compound of uv-944 and uv-623, and the mass ratio of uv-944 to uv-623 is 1.
The preparation method of the uvioresistant master batch comprises the following steps: the poly (butylene adipate/terephthalate), the ultraviolet agent, the antioxidant 1010 and the polyethylene wax are mixed in a mixer at a low speed for 2min, and then extruded by a Koya AK36 extruder (length-diameter ratio of 40) system, wherein the extrusion temperature is shown in Table 1.
TABLE 1 extruder temperature (. Degree. C.) for the preparation of UV resistant masterbatch
| Position of | A segment of | Two segment | Three sections | Four sections | Five sections | Six sections | Seven sections | Eight sections | Nine sections | Machine head | Melt body |
| Temperature/. |
150 | 160 | 160 | 165 | 170 | 170 | 165 | 160 | 160 | 160 | 160 |
The preparation method of the full-biodegradable film comprises the following steps: mixing poly (butylene adipate/terephthalate), polylactic acid, talcum powder, antioxidant, ultraviolet resistant master batch, cross-linking agent, lubricant and powder coating agent in a 10L mixer at low speed for 2min, and extruding by using an extruder AK36 (length-diameter ratio of 40) system. The extruder temperature settings are shown in table 2:
TABLE 2 extruder temperature (. Degree.C.) for preparing fully biodegradable films
| Position of | A section of | Two segment | Three sections | Four sections | Five sections | Six sections | Seven sections | Eight segments | Nine sections | Machine head | Melt body |
| Temperature/. |
150 | 160 | 165 | 170 | 175 | 175 | 170 | 165 | 160 | 160 | 160 |
The extruded pellets were dried for 6 hours at 70 ℃ by means of a forced air drying oven, and then blown by means of a film blowing machine at 175 ℃ at a blow-up ratio (ratio of film diameter to die orifice diameter) of 2.55 to give a film having a thickness of 0.01mm.
Example 2
The other conditions are the same as those of example 1, only the ultraviolet absorbent is omitted, the ultraviolet absorbent in the ultraviolet resistant master batch is replaced by the free radical trapping agent, the free radical trapping agent is a compound of uv-944 and uv-623, and the mass ratio of uv-944 to uv-623 is 1.
Example 3
The preparation raw materials of the fully biodegradable film provided in this example are as follows by mass fraction: 87.04 percent of poly (butylene adipate)/terephthalate), 4.3 percent of polylactic acid, 4.3 percent of talcum powder, 0.7 percent of antioxidant, 2.32 percent of uvioresistant master batch, 0.12 percent of cross-linking agent, 1.05 percent of lubricating agent and 0.17 percent of powder coating agent.
The types of the ultraviolet resistant master batch, the cross-linking agent, the lubricant and the powder coating agent are the same as those in the embodiment 1.
The preparation methods of the uvioresistant master batch and the full-biodegradable film are consistent with the example 1.
Example 4
The preparation raw materials of the fully biodegradable film provided in this example are as follows by mass fraction: 82.2 percent of poly (butylene adipate)/terephthalate, 4.3 percent of polylactic acid, 8.6 percent of talcum powder, 0.7 percent of antioxidant, 2.86 percent of anti-ultraviolet master batch, 0.12 percent of cross-linking agent, 1.05 percent of lubricant and 0.17 percent of powder coating agent.
The types of the ultraviolet resistant master batch, the cross-linking agent, the lubricant and the powder coating agent are the same as those in the embodiment 1.
The preparation methods of the uvioresistant master batch and the full-biodegradable film are consistent with the example 1.
Example 5
The preparation raw materials of the fully biodegradable film provided in this example are as follows by mass fraction: 86.15 percent of poly (butylene adipate)/terephthalate), 4.3 percent of polylactic acid, 4.3 percent of talcum powder, 0.7 percent of antioxidant, 2.86 percent of uvioresistant master batch, 0.12 percent of cross-linking agent, 1.4 percent of lubricating agent and 0.17 percent of powder coating agent.
The types of the ultraviolet resistant master batch, the cross-linking agent, the lubricant and the powder coating agent are the same as those in the embodiment 1.
The preparation methods of the uvioresistant master batch and the full-biodegradable film are consistent with the example 1.
Example 6
The preparation raw materials of the fully biodegradable film provided in this example are as follows by mass fraction: 86.2 percent of poly (butylene adipate)/terephthalate), 4.3 percent of polylactic acid, 4.3 percent of talcum powder, 1 percent of antioxidant, 2.86 percent of anti-ultraviolet master batch, 0.12 percent of cross-linking agent, 1.05 percent of lubricant and 0.17 percent of powder coating agent.
The types of the ultraviolet resistant master batch, the cross-linking agent, the lubricant and the powder coating agent are the same as those in the embodiment 1.
The preparation methods of the ultraviolet resistant master batch and the full biodegradable film are consistent with the example 1.
And (3) testing weather resistance:
the fully biodegradable films prepared in examples 1 to 6 were subjected to a weather resistance test: the experiment is carried out by adopting an Esper science and technology ultraviolet aging box, and the experimental conditions are set as follows according to the requirements in GB/T16422.3-1997: and (3) carrying out 60 ℃/4h ultraviolet illumination and 50 ℃/4h lightless condensation for 120h, and then carrying out mechanical property on each group of samples by using a universal testing machine. The elongation at break can still be more than 200 percent after a 96h weather-proof experiment, and the tensile strength can still be more than 10MPa, thereby being qualified.
The results of the experiment are shown in FIGS. 1 to 4 and tables 3 to 6.
TABLE 3 transverse elongation at Break test results (%)
| | |
|
|
72h | 96h | 120h | ||
| Example 1 | 836 | 864 | 732 | 721 | 572 | 483 | ||
| Example 2 | 987 | 930 | 776 | 735 | 569 | 371 | ||
| Example 3 | 812 | 732 | 711 | 682 | 459 | 340 | ||
| Example 4 | 808 | 677 | 487 | 325 | 251 | 224 | ||
| Example 5 | 876 | 885 | 686 | 649 | 449 | 366 | ||
| Example 6 | 845 | 828 | 663 | 608 | 359 | 296 |
Table 4 longitudinal elongation at break test results (%) -of fully biodegradable film
| | |
|
|
72h | 96h | 120h | ||
| Example 1 | 367 | 350 | 336 | 333 | 275 | 191 | ||
| Example 2 | 378 | 372 | 351 | 325 | 258 | 154 | ||
| Example 3 | 360 | 423 | 319 | 291 | 232 | 135 | ||
| Example 4 | 350 | 306 | 284 | 212 | 208 | 108 | ||
| Example 5 | 398 | 365 | 313 | 288 | 217 | 162 | ||
| Example 6 | 346 | 389 | 328 | 303 | 229 | 155 |
TABLE 5 transverse tensile Strength test results (MPa) for fully biodegradable films
| | |
|
|
72h | 96h | 120h | ||
| Example 1 | 34.3 | 24.5 | 18.5 | 16.8 | 13.8 | 12.7 | ||
| Example 2 | 36.7 | 25.5 | 18.3 | 15.1 | 11.9 | 11.5 | ||
| Example 3 | 32.0 | 22.8 | 17.1 | 16.5 | 12.2 | 10.9 | ||
| Example 4 | 34.8 | 19.7 | 14.8 | 11.5 | 10.9 | 10.2 | ||
| Example 5 | 27.9 | 20.4 | 18.6 | 17.5 | 12.5 | 11.1 | ||
| Example 6 | 32.9 | 23.5 | 17.2 | 15.4 | 12.8 | 11.3 |
TABLE 6 longitudinal tensile Strength test results (MPa) of fully biodegradable films
| | |
|
|
72h | 96h | 120h | ||
| Example 1 | 34.9 | 30.5 | 27.6 | 23.7 | 21.9 | 18.5 | ||
| Example 2 | 36.8 | 26.0 | 24.0 | 20.2 | 18.9 | 16.8 | ||
| Example 3 | 28.8 | 25.0 | 21.8 | 18.8 | 17.2 | 15.2 | ||
| Example 4 | 27.1 | 19.6 | 16.8 | 13.5 | 10.5 | 10.2 | ||
| Example 5 | 24.7 | 23.4 | 22.1 | 20.4 | 18.4 | 16.7 | ||
| Example 6 | 29.5 | 25.1 | 22.3 | 19.9 | 18.7 | 17.2 |
Experimental examples 1 and 2 are experimental groups for changing the content of the ultraviolet resistant master batch, experimental example 3 is an experimental group for changing the content of the ultraviolet resistant master batch, experimental example 4 is an experimental group for changing the content of talcum powder, experimental example 5 is an experimental group for changing the content of a lubricant, and experimental example 6 is an experimental group for changing the content of an antioxidant. As can be seen from the data in fig. 1 to 4 and tables 3 to 6, the elongation at break of the fully biodegradable mulching films prepared in examples 1 to 6 of the present invention can be maintained to be greater than 200% after 96 hours, the tensile strength can be maintained to be greater than 10Mpa, and the use requirements can be met, which indicates that the fully biodegradable mulching films have excellent weather resistance, and the mechanical property data of 120 hours is also tested in the present invention, and the results show that the fully biodegradable mulching films prepared in examples 1 to 6 of the present invention still have excellent mechanical properties after 120 hours; furthermore, it can be seen from the above data that the fully biodegradable film obtained in example 1 has the best weather resistance. The results show that the fully biodegradable film provided by the invention has excellent weather resistance, and the service cycle is long when the film is used as a mulching film.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and amendments can be made without departing from the principle of the present invention, and these modifications and amendments should also be considered as the protection scope of the present invention.
Claims (10)
1. The full-biodegradable film is characterized in that the preparation raw materials comprise the following components in percentage by mass: 70-90% of poly (butylene adipate/terephthalate), 3-10% of polylactic acid, 2-15% of talcum powder, 0.5-1.5% of antioxidant, 2-7% of anti-ultraviolet master batch, 0.07-0.15% of cross-linking agent, 0.8-1.5% of lubricant and 0.1-0.4% of powder coating agent;
the preparation raw materials of the uvioresistant master batch comprise the following components in percentage by mass: 67-80% of poly-adipic acid/butylene terephthalate, 18-30% of ultraviolet agent, 10100.2-0.6% of antioxidant, 0.5-1% of polyethylene wax and 0.5-1.5% of dispersant.
2. The fully biodegradable film according to claim 1, wherein the antioxidant for preparing the fully biodegradable film comprises one or more of pentaerythritol tetrakis [ β - (3, 5-di-t-butyl-4-hydroxyphenyl) propionate ], tris [2, 4-di-t-butylphenyl ] phosphite and 4, 4-thiobis (6-t-butyl-3-methylphenol).
3. The fully biodegradable film according to claim 1, wherein the cross-linking agent is one or more of chain extenders KL-E4370B, BP-96 and triglycidyl isocyanurate; the powder coating agent is a coating agent 222.
4. The fully biodegradable film according to claim 1, wherein said lubricant is one or more of polyethylene wax, monoglycerides and pentaerythrityl tetrastearate.
5. The fully biodegradable film according to claim 1, wherein said UV agent is one or more of UV absorber and radical scavenger.
6. The fully biodegradable film according to claim 5, wherein said UV absorber is one or more of uv-234, uv-5686, uv-531 and uv-326, and said radical scavenger is one or more of uv-944, uv-783, uv-623, bsf-2020 and uv-902.
7. The method for preparing the fully biodegradable film according to any one of claims 1 to 6, comprising the steps of:
blending and extruding raw materials for preparing the full-biodegradable film to obtain granules;
and blowing the granules to obtain the full-biodegradable film.
8. The method according to claim 7, wherein the blown film has a temperature of 170 to 175 ℃ and a blow-up ratio of 2.5 to 2.8.
9. Use of the fully biodegradable film according to any one of claims 1 to 6 or the fully biodegradable film prepared by the preparation method according to claim 7 or 8 in mulching films.
10. The use according to claim 9, wherein the thickness of the mulch film is between 0.008 and 0.012mm.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018028513A1 (en) * | 2016-08-12 | 2018-02-15 | 金发科技股份有限公司 | Biodegradable polyester thin film and preparation method therefor |
| CN111303594A (en) * | 2020-03-25 | 2020-06-19 | 贵州科泰天兴农业科技有限公司 | Full-biodegradable mulching film for cigarettes and preparation method thereof |
| CN112280258A (en) * | 2020-11-02 | 2021-01-29 | 兰州鑫银环橡塑制品有限公司 | Full-biodegradable mulching film with controllable degradation period and preparation method thereof |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018028513A1 (en) * | 2016-08-12 | 2018-02-15 | 金发科技股份有限公司 | Biodegradable polyester thin film and preparation method therefor |
| CN111303594A (en) * | 2020-03-25 | 2020-06-19 | 贵州科泰天兴农业科技有限公司 | Full-biodegradable mulching film for cigarettes and preparation method thereof |
| CN112280258A (en) * | 2020-11-02 | 2021-01-29 | 兰州鑫银环橡塑制品有限公司 | Full-biodegradable mulching film with controllable degradation period and preparation method thereof |
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